drivers/net/bonding/bond_main.c

   1 // SPDX-License-Identifier: GPL-1.0+
   2 /*
   3  * originally based on the dummy device.
   4  *
   5  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   6  * Based on dummy.c, and eql.c devices.
   7  *
   8  * bonding.c: an Ethernet Bonding driver
   9  *
  10  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  11  *      Cisco 5500
  12  *      Sun Trunking (Solaris)
  13  *      Alteon AceDirector Trunks
  14  *      Linux Bonding
  15  *      and probably many L2 switches ...
  16  *
  17  * How it works:
  18  *    ifconfig bond0 ipaddress netmask up
  19  *      will setup a network device, with an ip address.  No mac address
  20  *      will be assigned at this time.  The hw mac address will come from
  21  *      the first slave bonded to the channel.  All slaves will then use
  22  *      this hw mac address.
  23  *
  24  *    ifconfig bond0 down
  25  *         will release all slaves, marking them as down.
  26  *
  27  *    ifenslave bond0 eth0
  28  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  29  *      a: be used as initial mac address
  30  *      b: if a hw mac address already is there, eth0's hw mac address
  31  *         will then be set from bond0.
  32  *
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/types.h>
  38 #include <linux/fcntl.h>
  39 #include <linux/filter.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/ptrace.h>
  42 #include <linux/ioport.h>
  43 #include <linux/in.h>
  44 #include <net/ip.h>
  45 #include <linux/ip.h>
  46 #include <linux/icmp.h>
  47 #include <linux/icmpv6.h>
  48 #include <linux/tcp.h>
  49 #include <linux/udp.h>
  50 #include <linux/slab.h>
  51 #include <linux/string.h>
  52 #include <linux/init.h>
  53 #include <linux/timer.h>
  54 #include <linux/socket.h>
  55 #include <linux/ctype.h>
  56 #include <linux/inet.h>
  57 #include <linux/bitops.h>
  58 #include <linux/io.h>
  59 #include <asm/dma.h>
  60 #include <linux/uaccess.h>
  61 #include <linux/errno.h>
  62 #include <linux/netdevice.h>
  63 #include <linux/inetdevice.h>
  64 #include <linux/igmp.h>
  65 #include <linux/etherdevice.h>
  66 #include <linux/skbuff.h>
  67 #include <net/sock.h>
  68 #include <linux/rtnetlink.h>
  69 #include <linux/smp.h>
  70 #include <linux/if_ether.h>
  71 #include <net/arp.h>
  72 #include <linux/mii.h>
  73 #include <linux/ethtool.h>
  74 #include <linux/if_vlan.h>
  75 #include <linux/if_bonding.h>
  76 #include <linux/phy.h>
  77 #include <linux/jiffies.h>
  78 #include <linux/preempt.h>
  79 #include <net/route.h>
  80 #include <net/net_namespace.h>
  81 #include <net/netns/generic.h>
  82 #include <net/pkt_sched.h>
  83 #include <linux/rculist.h>
  84 #include <net/flow_dissector.h>
  85 #include <net/xfrm.h>
  86 #include <net/bonding.h>
  87 #include <net/bond_3ad.h>
  88 #include <net/bond_alb.h>
  89 #if IS_ENABLED(CONFIG_TLS_DEVICE)
  90 #include <net/tls.h>
  91 #endif
  92 #include <net/ip6_route.h>
  93 #include <net/xdp.h>
  94
  95 #include "bonding_priv.h"
  96
  97 /*---------------------------- Module parameters ----------------------------*/
  98
  99 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
 100
 101 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
 102 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
 103 static int num_peer_notif = 1;
 104 static int miimon;
 105 static int updelay;
 106 static int downdelay;
 107 static int use_carrier  = 1;
 108 static char *mode;
 109 static char *primary;
 110 static char *primary_reselect;
 111 static char *lacp_rate;
 112 static int min_links;
 113 static char *ad_select;
 114 static char *xmit_hash_policy;
 115 static int arp_interval;
 116 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 117 static char *arp_validate;
 118 static char *arp_all_targets;
 119 static char *fail_over_mac;
 120 static int all_slaves_active;
 121 static struct bond_params bonding_defaults;
 122 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 123 static int packets_per_slave = 1;
 124 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 125
 126 module_param(max_bonds, int, 0);
 127 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 128 module_param(tx_queues, int, 0);
 129 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 130 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 131 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 132                                "failover event (alias of num_unsol_na)");
 133 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 134 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 135                                "failover event (alias of num_grat_arp)");
 136 module_param(miimon, int, 0);
 137 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 138 module_param(updelay, int, 0);
 139 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 140 module_param(downdelay, int, 0);
 141 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 142                             "in milliseconds");
 143 module_param(use_carrier, int, 0);
 144 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 145                               "0 for off, 1 for on (default)");
 146 module_param(mode, charp, 0);
 147 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 148                        "1 for active-backup, 2 for balance-xor, "
 149                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 150                        "6 for balance-alb");
 151 module_param(primary, charp, 0);
 152 MODULE_PARM_DESC(primary, "Primary network device to use");
 153 module_param(primary_reselect, charp, 0);
 154 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 155                                    "once it comes up; "
 156                                    "0 for always (default), "
 157                                    "1 for only if speed of primary is "
 158                                    "better, "
 159                                    "2 for only on active slave "
 160                                    "failure");
 161 module_param(lacp_rate, charp, 0);
 162 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 163                             "0 for slow, 1 for fast");
 164 module_param(ad_select, charp, 0);
 165 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 166                             "0 for stable (default), 1 for bandwidth, "
 167                             "2 for count");
 168 module_param(min_links, int, 0);
 169 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 170
 171 module_param(xmit_hash_policy, charp, 0);
 172 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
 173                                    "0 for layer 2 (default), 1 for layer 3+4, "
 174                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 175                                    "4 for encap layer 3+4, 5 for vlan+srcmac");
 176 module_param(arp_interval, int, 0);
 177 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 178 module_param_array(arp_ip_target, charp, NULL, 0);
 179 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 180 module_param(arp_validate, charp, 0);
 181 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 182                                "0 for none (default), 1 for active, "
 183                                "2 for backup, 3 for all");
 184 module_param(arp_all_targets, charp, 0);
 185 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 186 module_param(fail_over_mac, charp, 0);
 187 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 188                                 "the same MAC; 0 for none (default), "
 189                                 "1 for active, 2 for follow");
 190 module_param(all_slaves_active, int, 0);
 191 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 192                                      "by setting active flag for all slaves; "
 193                                      "0 for never (default), 1 for always.");
 194 module_param(resend_igmp, int, 0);
 195 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 196                               "link failure");
 197 module_param(packets_per_slave, int, 0);
 198 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 199                                     "mode; 0 for a random slave, 1 packet per "
 200                                     "slave (default), >1 packets per slave.");
 201 module_param(lp_interval, uint, 0);
 202 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 203                               "the bonding driver sends learning packets to "
 204                               "each slaves peer switch. The default is 1.");
 205
 206 /*----------------------------- Global variables ----------------------------*/
 207
 208 #ifdef CONFIG_NET_POLL_CONTROLLER
 209 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 210 #endif
 211
 212 unsigned int bond_net_id __read_mostly;
 213
 214 static const struct flow_dissector_key flow_keys_bonding_keys[] = {
 215         {
 216                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
 217                 .offset = offsetof(struct flow_keys, control),
 218         },
 219         {
 220                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
 221                 .offset = offsetof(struct flow_keys, basic),
 222         },
 223         {
 224                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 225                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
 226         },
 227         {
 228                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 229                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
 230         },
 231         {
 232                 .key_id = FLOW_DISSECTOR_KEY_TIPC,
 233                 .offset = offsetof(struct flow_keys, addrs.tipckey),
 234         },
 235         {
 236                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
 237                 .offset = offsetof(struct flow_keys, ports),
 238         },
 239         {
 240                 .key_id = FLOW_DISSECTOR_KEY_ICMP,
 241                 .offset = offsetof(struct flow_keys, icmp),
 242         },
 243         {
 244                 .key_id = FLOW_DISSECTOR_KEY_VLAN,
 245                 .offset = offsetof(struct flow_keys, vlan),
 246         },
 247         {
 248                 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
 249                 .offset = offsetof(struct flow_keys, tags),
 250         },
 251         {
 252                 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
 253                 .offset = offsetof(struct flow_keys, keyid),
 254         },
 255 };
 256
 257 static struct flow_dissector flow_keys_bonding __read_mostly;
 258
 259 /*-------------------------- Forward declarations ---------------------------*/
 260
 261 static int bond_init(struct net_device *bond_dev);
 262 static void bond_uninit(struct net_device *bond_dev);
 263 static void bond_get_stats(struct net_device *bond_dev,
 264                            struct rtnl_link_stats64 *stats);
 265 static void bond_slave_arr_handler(struct work_struct *work);
 266 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 267                                   int mod);
 268 static void bond_netdev_notify_work(struct work_struct *work);
 269
 270 /*---------------------------- General routines -----------------------------*/
 271
 272 const char *bond_mode_name(int mode)
 273 {
 274         static const char *names[] = {
 275                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 276                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 277                 [BOND_MODE_XOR] = "load balancing (xor)",
 278                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 279                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 280                 [BOND_MODE_TLB] = "transmit load balancing",
 281                 [BOND_MODE_ALB] = "adaptive load balancing",
 282         };
 283
 284         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 285                 return "unknown";
 286
 287         return names[mode];
 288 }
 289
 290 /**
 291  * bond_dev_queue_xmit - Prepare skb for xmit.
 292  *
 293  * @bond: bond device that got this skb for tx.
 294  * @skb: hw accel VLAN tagged skb to transmit
 295  * @slave_dev: slave that is supposed to xmit this skbuff
 296  */
 297 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 298                         struct net_device *slave_dev)
 299 {
 300         skb->dev = slave_dev;
 301
 302         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 303                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 304         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 305
 306         if (unlikely(netpoll_tx_running(bond->dev)))
 307                 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 308
 309         return dev_queue_xmit(skb);
 310 }
 311
 312 static bool bond_sk_check(struct bonding *bond)
 313 {
 314         switch (BOND_MODE(bond)) {
 315         case BOND_MODE_8023AD:
 316         case BOND_MODE_XOR:
 317                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
 318                         return true;
 319                 fallthrough;
 320         default:
 321                 return false;
 322         }
 323 }
 324
 325 static bool bond_xdp_check(struct bonding *bond)
 326 {
 327         switch (BOND_MODE(bond)) {
 328         case BOND_MODE_ROUNDROBIN:
 329         case BOND_MODE_ACTIVEBACKUP:
 330                 return true;
 331         case BOND_MODE_8023AD:
 332         case BOND_MODE_XOR:
 333                 /* vlan+srcmac is not supported with XDP as in most cases the 802.1q
 334                  * payload is not in the packet due to hardware offload.
 335                  */
 336                 if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC)
 337                         return true;
 338                 fallthrough;
 339         default:
 340                 return false;
 341         }
 342 }
 343
 344 /*---------------------------------- VLAN -----------------------------------*/
 345
 346 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 347  * We don't protect the slave list iteration with a lock because:
 348  * a. This operation is performed in IOCTL context,
 349  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 350  * c. Holding a lock with BH disabled while directly calling a base driver
 351  *    entry point is generally a BAD idea.
 352  *
 353  * The design of synchronization/protection for this operation in the 8021q
 354  * module is good for one or more VLAN devices over a single physical device
 355  * and cannot be extended for a teaming solution like bonding, so there is a
 356  * potential race condition here where a net device from the vlan group might
 357  * be referenced (either by a base driver or the 8021q code) while it is being
 358  * removed from the system. However, it turns out we're not making matters
 359  * worse, and if it works for regular VLAN usage it will work here too.
 360 */
 361
 362 /**
 363  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 364  * @bond_dev: bonding net device that got called
 365  * @proto: network protocol ID
 366  * @vid: vlan id being added
 367  */
 368 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 369                                 __be16 proto, u16 vid)
 370 {
 371         struct bonding *bond = netdev_priv(bond_dev);
 372         struct slave *slave, *rollback_slave;
 373         struct list_head *iter;
 374         int res;
 375
 376         bond_for_each_slave(bond, slave, iter) {
 377                 res = vlan_vid_add(slave->dev, proto, vid);
 378                 if (res)
 379                         goto unwind;
 380         }
 381
 382         return 0;
 383
 384 unwind:
 385         /* unwind to the slave that failed */
 386         bond_for_each_slave(bond, rollback_slave, iter) {
 387                 if (rollback_slave == slave)
 388                         break;
 389
 390                 vlan_vid_del(rollback_slave->dev, proto, vid);
 391         }
 392
 393         return res;
 394 }
 395
 396 /**
 397  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 398  * @bond_dev: bonding net device that got called
 399  * @proto: network protocol ID
 400  * @vid: vlan id being removed
 401  */
 402 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 403                                  __be16 proto, u16 vid)
 404 {
 405         struct bonding *bond = netdev_priv(bond_dev);
 406         struct list_head *iter;
 407         struct slave *slave;
 408
 409         bond_for_each_slave(bond, slave, iter)
 410                 vlan_vid_del(slave->dev, proto, vid);
 411
 412         if (bond_is_lb(bond))
 413                 bond_alb_clear_vlan(bond, vid);
 414
 415         return 0;
 416 }
 417
 418 /*---------------------------------- XFRM -----------------------------------*/
 419
 420 #ifdef CONFIG_XFRM_OFFLOAD
 421 /**
 422  * bond_ipsec_add_sa - program device with a security association
 423  * @xs: pointer to transformer state struct
 424  * @extack: extack point to fill failure reason
 425  **/
 426 static int bond_ipsec_add_sa(struct xfrm_state *xs,
 427                              struct netlink_ext_ack *extack)
 428 {
 429         struct net_device *bond_dev = xs->xso.dev;
 430         struct bond_ipsec *ipsec;
 431         struct bonding *bond;
 432         struct slave *slave;
 433         int err;
 434
 435         if (!bond_dev)
 436                 return -EINVAL;
 437
 438         rcu_read_lock();
 439         bond = netdev_priv(bond_dev);
 440         slave = rcu_dereference(bond->curr_active_slave);
 441         if (!slave) {
 442                 rcu_read_unlock();
 443                 return -ENODEV;
 444         }
 445
 446         if (!slave->dev->xfrmdev_ops ||
 447             !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
 448             netif_is_bond_master(slave->dev)) {
 449                 NL_SET_ERR_MSG_MOD(extack, "Slave does not support ipsec offload");
 450                 rcu_read_unlock();
 451                 return -EINVAL;
 452         }
 453
 454         ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC);
 455         if (!ipsec) {
 456                 rcu_read_unlock();
 457                 return -ENOMEM;
 458         }
 459         xs->xso.real_dev = slave->dev;
 460
 461         err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs, extack);
 462         if (!err) {
 463                 ipsec->xs = xs;
 464                 INIT_LIST_HEAD(&ipsec->list);
 465                 spin_lock_bh(&bond->ipsec_lock);
 466                 list_add(&ipsec->list, &bond->ipsec_list);
 467                 spin_unlock_bh(&bond->ipsec_lock);
 468         } else {
 469                 kfree(ipsec);
 470         }
 471         rcu_read_unlock();
 472         return err;
 473 }
 474
 475 static void bond_ipsec_add_sa_all(struct bonding *bond)
 476 {
 477         struct net_device *bond_dev = bond->dev;
 478         struct bond_ipsec *ipsec;
 479         struct slave *slave;
 480
 481         rcu_read_lock();
 482         slave = rcu_dereference(bond->curr_active_slave);
 483         if (!slave)
 484                 goto out;
 485
 486         if (!slave->dev->xfrmdev_ops ||
 487             !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
 488             netif_is_bond_master(slave->dev)) {
 489                 spin_lock_bh(&bond->ipsec_lock);
 490                 if (!list_empty(&bond->ipsec_list))
 491                         slave_warn(bond_dev, slave->dev,
 492                                    "%s: no slave xdo_dev_state_add\n",
 493                                    __func__);
 494                 spin_unlock_bh(&bond->ipsec_lock);
 495                 goto out;
 496         }
 497
 498         spin_lock_bh(&bond->ipsec_lock);
 499         list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 500                 ipsec->xs->xso.real_dev = slave->dev;
 501                 if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs, NULL)) {
 502                         slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__);
 503                         ipsec->xs->xso.real_dev = NULL;
 504                 }
 505         }
 506         spin_unlock_bh(&bond->ipsec_lock);
 507 out:
 508         rcu_read_unlock();
 509 }
 510
 511 /**
 512  * bond_ipsec_del_sa - clear out this specific SA
 513  * @xs: pointer to transformer state struct
 514  **/
 515 static void bond_ipsec_del_sa(struct xfrm_state *xs)
 516 {
 517         struct net_device *bond_dev = xs->xso.dev;
 518         struct bond_ipsec *ipsec;
 519         struct bonding *bond;
 520         struct slave *slave;
 521
 522         if (!bond_dev)
 523                 return;
 524
 525         rcu_read_lock();
 526         bond = netdev_priv(bond_dev);
 527         slave = rcu_dereference(bond->curr_active_slave);
 528
 529         if (!slave)
 530                 goto out;
 531
 532         if (!xs->xso.real_dev)
 533                 goto out;
 534
 535         WARN_ON(xs->xso.real_dev != slave->dev);
 536
 537         if (!slave->dev->xfrmdev_ops ||
 538             !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
 539             netif_is_bond_master(slave->dev)) {
 540                 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
 541                 goto out;
 542         }
 543
 544         slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
 545 out:
 546         spin_lock_bh(&bond->ipsec_lock);
 547         list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 548                 if (ipsec->xs == xs) {
 549                         list_del(&ipsec->list);
 550                         kfree(ipsec);
 551                         break;
 552                 }
 553         }
 554         spin_unlock_bh(&bond->ipsec_lock);
 555         rcu_read_unlock();
 556 }
 557
 558 static void bond_ipsec_del_sa_all(struct bonding *bond)
 559 {
 560         struct net_device *bond_dev = bond->dev;
 561         struct bond_ipsec *ipsec;
 562         struct slave *slave;
 563
 564         rcu_read_lock();
 565         slave = rcu_dereference(bond->curr_active_slave);
 566         if (!slave) {
 567                 rcu_read_unlock();
 568                 return;
 569         }
 570
 571         spin_lock_bh(&bond->ipsec_lock);
 572         list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 573                 if (!ipsec->xs->xso.real_dev)
 574                         continue;
 575
 576                 if (!slave->dev->xfrmdev_ops ||
 577                     !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
 578                     netif_is_bond_master(slave->dev)) {
 579                         slave_warn(bond_dev, slave->dev,
 580                                    "%s: no slave xdo_dev_state_delete\n",
 581                                    __func__);
 582                 } else {
 583                         slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs);
 584                 }
 585                 ipsec->xs->xso.real_dev = NULL;
 586         }
 587         spin_unlock_bh(&bond->ipsec_lock);
 588         rcu_read_unlock();
 589 }
 590
 591 /**
 592  * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
 593  * @skb: current data packet
 594  * @xs: pointer to transformer state struct
 595  **/
 596 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 597 {
 598         struct net_device *bond_dev = xs->xso.dev;
 599         struct net_device *real_dev;
 600         struct slave *curr_active;
 601         struct bonding *bond;
 602         int err;
 603
 604         bond = netdev_priv(bond_dev);
 605         rcu_read_lock();
 606         curr_active = rcu_dereference(bond->curr_active_slave);
 607         real_dev = curr_active->dev;
 608
 609         if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
 610                 err = false;
 611                 goto out;
 612         }
 613
 614         if (!xs->xso.real_dev) {
 615                 err = false;
 616                 goto out;
 617         }
 618
 619         if (!real_dev->xfrmdev_ops ||
 620             !real_dev->xfrmdev_ops->xdo_dev_offload_ok ||
 621             netif_is_bond_master(real_dev)) {
 622                 err = false;
 623                 goto out;
 624         }
 625
 626         err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
 627 out:
 628         rcu_read_unlock();
 629         return err;
 630 }
 631
 632 static const struct xfrmdev_ops bond_xfrmdev_ops = {
 633         .xdo_dev_state_add = bond_ipsec_add_sa,
 634         .xdo_dev_state_delete = bond_ipsec_del_sa,
 635         .xdo_dev_offload_ok = bond_ipsec_offload_ok,
 636 };
 637 #endif /* CONFIG_XFRM_OFFLOAD */
 638
 639 /*------------------------------- Link status -------------------------------*/
 640
 641 /* Set the carrier state for the master according to the state of its
 642  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 643  * do special 802.3ad magic.
 644  *
 645  * Returns zero if carrier state does not change, nonzero if it does.
 646  */
 647 int bond_set_carrier(struct bonding *bond)
 648 {
 649         struct list_head *iter;
 650         struct slave *slave;
 651
 652         if (!bond_has_slaves(bond))
 653                 goto down;
 654
 655         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 656                 return bond_3ad_set_carrier(bond);
 657
 658         bond_for_each_slave(bond, slave, iter) {
 659                 if (slave->link == BOND_LINK_UP) {
 660                         if (!netif_carrier_ok(bond->dev)) {
 661                                 netif_carrier_on(bond->dev);
 662                                 return 1;
 663                         }
 664                         return 0;
 665                 }
 666         }
 667
 668 down:
 669         if (netif_carrier_ok(bond->dev)) {
 670                 netif_carrier_off(bond->dev);
 671                 return 1;
 672         }
 673         return 0;
 674 }
 675
 676 /* Get link speed and duplex from the slave's base driver
 677  * using ethtool. If for some reason the call fails or the
 678  * values are invalid, set speed and duplex to -1,
 679  * and return. Return 1 if speed or duplex settings are
 680  * UNKNOWN; 0 otherwise.
 681  */
 682 static int bond_update_speed_duplex(struct slave *slave)
 683 {
 684         struct net_device *slave_dev = slave->dev;
 685         struct ethtool_link_ksettings ecmd;
 686         int res;
 687
 688         slave->speed = SPEED_UNKNOWN;
 689         slave->duplex = DUPLEX_UNKNOWN;
 690
 691         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 692         if (res < 0)
 693                 return 1;
 694         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 695                 return 1;
 696         switch (ecmd.base.duplex) {
 697         case DUPLEX_FULL:
 698         case DUPLEX_HALF:
 699                 break;
 700         default:
 701                 return 1;
 702         }
 703
 704         slave->speed = ecmd.base.speed;
 705         slave->duplex = ecmd.base.duplex;
 706
 707         return 0;
 708 }
 709
 710 const char *bond_slave_link_status(s8 link)
 711 {
 712         switch (link) {
 713         case BOND_LINK_UP:
 714                 return "up";
 715         case BOND_LINK_FAIL:
 716                 return "going down";
 717         case BOND_LINK_DOWN:
 718                 return "down";
 719         case BOND_LINK_BACK:
 720                 return "going back";
 721         default:
 722                 return "unknown";
 723         }
 724 }
 725
 726 /* if <dev> supports MII link status reporting, check its link status.
 727  *
 728  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 729  * depending upon the setting of the use_carrier parameter.
 730  *
 731  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 732  * can't tell and just pretend it is), or 0, meaning that the link is
 733  * down.
 734  *
 735  * If reporting is non-zero, instead of faking link up, return -1 if
 736  * both ETHTOOL and MII ioctls fail (meaning the device does not
 737  * support them).  If use_carrier is set, return whatever it says.
 738  * It'd be nice if there was a good way to tell if a driver supports
 739  * netif_carrier, but there really isn't.
 740  */
 741 static int bond_check_dev_link(struct bonding *bond,
 742                                struct net_device *slave_dev, int reporting)
 743 {
 744         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 745         int (*ioctl)(struct net_device *, struct ifreq *, int);
 746         struct ifreq ifr;
 747         struct mii_ioctl_data *mii;
 748
 749         if (!reporting && !netif_running(slave_dev))
 750                 return 0;
 751
 752         if (bond->params.use_carrier)
 753                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 754
 755         /* Try to get link status using Ethtool first. */
 756         if (slave_dev->ethtool_ops->get_link)
 757                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 758                         BMSR_LSTATUS : 0;
 759
 760         /* Ethtool can't be used, fallback to MII ioctls. */
 761         ioctl = slave_ops->ndo_eth_ioctl;
 762         if (ioctl) {
 763                 /* TODO: set pointer to correct ioctl on a per team member
 764                  *       bases to make this more efficient. that is, once
 765                  *       we determine the correct ioctl, we will always
 766                  *       call it and not the others for that team
 767                  *       member.
 768                  */
 769
 770                 /* We cannot assume that SIOCGMIIPHY will also read a
 771                  * register; not all network drivers (e.g., e100)
 772                  * support that.
 773                  */
 774
 775                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 776                 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 777                 mii = if_mii(&ifr);
 778                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 779                         mii->reg_num = MII_BMSR;
 780                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 781                                 return mii->val_out & BMSR_LSTATUS;
 782                 }
 783         }
 784
 785         /* If reporting, report that either there's no ndo_eth_ioctl,
 786          * or both SIOCGMIIREG and get_link failed (meaning that we
 787          * cannot report link status).  If not reporting, pretend
 788          * we're ok.
 789          */
 790         return reporting ? -1 : BMSR_LSTATUS;
 791 }
 792
 793 /*----------------------------- Multicast list ------------------------------*/
 794
 795 /* Push the promiscuity flag down to appropriate slaves */
 796 static int bond_set_promiscuity(struct bonding *bond, int inc)
 797 {
 798         struct list_head *iter;
 799         int err = 0;
 800
 801         if (bond_uses_primary(bond)) {
 802                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 803
 804                 if (curr_active)
 805                         err = dev_set_promiscuity(curr_active->dev, inc);
 806         } else {
 807                 struct slave *slave;
 808
 809                 bond_for_each_slave(bond, slave, iter) {
 810                         err = dev_set_promiscuity(slave->dev, inc);
 811                         if (err)
 812                                 return err;
 813                 }
 814         }
 815         return err;
 816 }
 817
 818 /* Push the allmulti flag down to all slaves */
 819 static int bond_set_allmulti(struct bonding *bond, int inc)
 820 {
 821         struct list_head *iter;
 822         int err = 0;
 823
 824         if (bond_uses_primary(bond)) {
 825                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 826
 827                 if (curr_active)
 828                         err = dev_set_allmulti(curr_active->dev, inc);
 829         } else {
 830                 struct slave *slave;
 831
 832                 bond_for_each_slave(bond, slave, iter) {
 833                         err = dev_set_allmulti(slave->dev, inc);
 834                         if (err)
 835                                 return err;
 836                 }
 837         }
 838         return err;
 839 }
 840
 841 /* Retrieve the list of registered multicast addresses for the bonding
 842  * device and retransmit an IGMP JOIN request to the current active
 843  * slave.
 844  */
 845 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 846 {
 847         struct bonding *bond = container_of(work, struct bonding,
 848                                             mcast_work.work);
 849
 850         if (!rtnl_trylock()) {
 851                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 852                 return;
 853         }
 854         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 855
 856         if (bond->igmp_retrans > 1) {
 857                 bond->igmp_retrans--;
 858                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 859         }
 860         rtnl_unlock();
 861 }
 862
 863 /* Flush bond's hardware addresses from slave */
 864 static void bond_hw_addr_flush(struct net_device *bond_dev,
 865                                struct net_device *slave_dev)
 866 {
 867         struct bonding *bond = netdev_priv(bond_dev);
 868
 869         dev_uc_unsync(slave_dev, bond_dev);
 870         dev_mc_unsync(slave_dev, bond_dev);
 871
 872         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 873                 dev_mc_del(slave_dev, lacpdu_mcast_addr);
 874 }
 875
 876 /*--------------------------- Active slave change ---------------------------*/
 877
 878 /* Update the hardware address list and promisc/allmulti for the new and
 879  * old active slaves (if any).  Modes that are not using primary keep all
 880  * slaves up date at all times; only the modes that use primary need to call
 881  * this function to swap these settings during a failover.
 882  */
 883 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 884                               struct slave *old_active)
 885 {
 886         if (old_active) {
 887                 if (bond->dev->flags & IFF_PROMISC)
 888                         dev_set_promiscuity(old_active->dev, -1);
 889
 890                 if (bond->dev->flags & IFF_ALLMULTI)
 891                         dev_set_allmulti(old_active->dev, -1);
 892
 893                 if (bond->dev->flags & IFF_UP)
 894                         bond_hw_addr_flush(bond->dev, old_active->dev);
 895         }
 896
 897         if (new_active) {
 898                 /* FIXME: Signal errors upstream. */
 899                 if (bond->dev->flags & IFF_PROMISC)
 900                         dev_set_promiscuity(new_active->dev, 1);
 901
 902                 if (bond->dev->flags & IFF_ALLMULTI)
 903                         dev_set_allmulti(new_active->dev, 1);
 904
 905                 if (bond->dev->flags & IFF_UP) {
 906                         netif_addr_lock_bh(bond->dev);
 907                         dev_uc_sync(new_active->dev, bond->dev);
 908                         dev_mc_sync(new_active->dev, bond->dev);
 909                         netif_addr_unlock_bh(bond->dev);
 910                 }
 911         }
 912 }
 913
 914 /**
 915  * bond_set_dev_addr - clone slave's address to bond
 916  * @bond_dev: bond net device
 917  * @slave_dev: slave net device
 918  *
 919  * Should be called with RTNL held.
 920  */
 921 static int bond_set_dev_addr(struct net_device *bond_dev,
 922                              struct net_device *slave_dev)
 923 {
 924         int err;
 925
 926         slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 927                   bond_dev, slave_dev, slave_dev->addr_len);
 928         err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 929         if (err)
 930                 return err;
 931
 932         __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len);
 933         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 934         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 935         return 0;
 936 }
 937
 938 static struct slave *bond_get_old_active(struct bonding *bond,
 939                                          struct slave *new_active)
 940 {
 941         struct slave *slave;
 942         struct list_head *iter;
 943
 944         bond_for_each_slave(bond, slave, iter) {
 945                 if (slave == new_active)
 946                         continue;
 947
 948                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 949                         return slave;
 950         }
 951
 952         return NULL;
 953 }
 954
 955 /* bond_do_fail_over_mac
 956  *
 957  * Perform special MAC address swapping for fail_over_mac settings
 958  *
 959  * Called with RTNL
 960  */
 961 static void bond_do_fail_over_mac(struct bonding *bond,
 962                                   struct slave *new_active,
 963                                   struct slave *old_active)
 964 {
 965         u8 tmp_mac[MAX_ADDR_LEN];
 966         struct sockaddr_storage ss;
 967         int rv;
 968
 969         switch (bond->params.fail_over_mac) {
 970         case BOND_FOM_ACTIVE:
 971                 if (new_active) {
 972                         rv = bond_set_dev_addr(bond->dev, new_active->dev);
 973                         if (rv)
 974                                 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
 975                                           -rv);
 976                 }
 977                 break;
 978         case BOND_FOM_FOLLOW:
 979                 /* if new_active && old_active, swap them
 980                  * if just old_active, do nothing (going to no active slave)
 981                  * if just new_active, set new_active to bond's MAC
 982                  */
 983                 if (!new_active)
 984                         return;
 985
 986                 if (!old_active)
 987                         old_active = bond_get_old_active(bond, new_active);
 988
 989                 if (old_active) {
 990                         bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 991                                           new_active->dev->addr_len);
 992                         bond_hw_addr_copy(ss.__data,
 993                                           old_active->dev->dev_addr,
 994                                           old_active->dev->addr_len);
 995                         ss.ss_family = new_active->dev->type;
 996                 } else {
 997                         bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 998                                           bond->dev->addr_len);
 999                         ss.ss_family = bond->dev->type;
1000                 }
1001
1002                 rv = dev_set_mac_address(new_active->dev,
1003                                          (struct sockaddr *)&ss, NULL);
1004                 if (rv) {
1005                         slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
1006                                   -rv);
1007                         goto out;
1008                 }
1009
1010                 if (!old_active)
1011                         goto out;
1012
1013                 bond_hw_addr_copy(ss.__data, tmp_mac,
1014                                   new_active->dev->addr_len);
1015                 ss.ss_family = old_active->dev->type;
1016
1017                 rv = dev_set_mac_address(old_active->dev,
1018                                          (struct sockaddr *)&ss, NULL);
1019                 if (rv)
1020                         slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
1021                                   -rv);
1022 out:
1023                 break;
1024         default:
1025                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
1026                            bond->params.fail_over_mac);
1027                 break;
1028         }
1029
1030 }
1031
1032 /**
1033  * bond_choose_primary_or_current - select the primary or high priority slave
1034  * @bond: our bonding struct
1035  *
1036  * - Check if there is a primary link. If the primary link was set and is up,
1037  *   go on and do link reselection.
1038  *
1039  * - If primary link is not set or down, find the highest priority link.
1040  *   If the highest priority link is not current slave, set it as primary
1041  *   link and do link reselection.
1042  */
1043 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
1044 {
1045         struct slave *prim = rtnl_dereference(bond->primary_slave);
1046         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
1047         struct slave *slave, *hprio = NULL;
1048         struct list_head *iter;
1049
1050         if (!prim || prim->link != BOND_LINK_UP) {
1051                 bond_for_each_slave(bond, slave, iter) {
1052                         if (slave->link == BOND_LINK_UP) {
1053                                 hprio = hprio ?: slave;
1054                                 if (slave->prio > hprio->prio)
1055                                         hprio = slave;
1056                         }
1057                 }
1058
1059                 if (hprio && hprio != curr) {
1060                         prim = hprio;
1061                         goto link_reselect;
1062                 }
1063
1064                 if (!curr || curr->link != BOND_LINK_UP)
1065                         return NULL;
1066                 return curr;
1067         }
1068
1069         if (bond->force_primary) {
1070                 bond->force_primary = false;
1071                 return prim;
1072         }
1073
1074 link_reselect:
1075         if (!curr || curr->link != BOND_LINK_UP)
1076                 return prim;
1077
1078         /* At this point, prim and curr are both up */
1079         switch (bond->params.primary_reselect) {
1080         case BOND_PRI_RESELECT_ALWAYS:
1081                 return prim;
1082         case BOND_PRI_RESELECT_BETTER:
1083                 if (prim->speed < curr->speed)
1084                         return curr;
1085                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
1086                         return curr;
1087                 return prim;
1088         case BOND_PRI_RESELECT_FAILURE:
1089                 return curr;
1090         default:
1091                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
1092                            bond->params.primary_reselect);
1093                 return curr;
1094         }
1095 }
1096
1097 /**
1098  * bond_find_best_slave - select the best available slave to be the active one
1099  * @bond: our bonding struct
1100  */
1101 static struct slave *bond_find_best_slave(struct bonding *bond)
1102 {
1103         struct slave *slave, *bestslave = NULL;
1104         struct list_head *iter;
1105         int mintime = bond->params.updelay;
1106
1107         slave = bond_choose_primary_or_current(bond);
1108         if (slave)
1109                 return slave;
1110
1111         bond_for_each_slave(bond, slave, iter) {
1112                 if (slave->link == BOND_LINK_UP)
1113                         return slave;
1114                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
1115                     slave->delay < mintime) {
1116                         mintime = slave->delay;
1117                         bestslave = slave;
1118                 }
1119         }
1120
1121         return bestslave;
1122 }
1123
1124 static bool bond_should_notify_peers(struct bonding *bond)
1125 {
1126         struct slave *slave;
1127
1128         rcu_read_lock();
1129         slave = rcu_dereference(bond->curr_active_slave);
1130         rcu_read_unlock();
1131
1132         if (!slave || !bond->send_peer_notif ||
1133             bond->send_peer_notif %
1134             max(1, bond->params.peer_notif_delay) != 0 ||
1135             !netif_carrier_ok(bond->dev) ||
1136             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1137                 return false;
1138
1139         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
1140                    slave ? slave->dev->name : "NULL");
1141
1142         return true;
1143 }
1144
1145 /**
1146  * bond_change_active_slave - change the active slave into the specified one
1147  * @bond: our bonding struct
1148  * @new_active: the new slave to make the active one
1149  *
1150  * Set the new slave to the bond's settings and unset them on the old
1151  * curr_active_slave.
1152  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1153  *
1154  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1155  * because it is apparently the best available slave we have, even though its
1156  * updelay hasn't timed out yet.
1157  *
1158  * Caller must hold RTNL.
1159  */
1160 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1161 {
1162         struct slave *old_active;
1163
1164         ASSERT_RTNL();
1165
1166         old_active = rtnl_dereference(bond->curr_active_slave);
1167
1168         if (old_active == new_active)
1169                 return;
1170
1171 #ifdef CONFIG_XFRM_OFFLOAD
1172         bond_ipsec_del_sa_all(bond);
1173 #endif /* CONFIG_XFRM_OFFLOAD */
1174
1175         if (new_active) {
1176                 new_active->last_link_up = jiffies;
1177
1178                 if (new_active->link == BOND_LINK_BACK) {
1179                         if (bond_uses_primary(bond)) {
1180                                 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
1181                                            (bond->params.updelay - new_active->delay) * bond->params.miimon);
1182                         }
1183
1184                         new_active->delay = 0;
1185                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
1186                                                   BOND_SLAVE_NOTIFY_NOW);
1187
1188                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1189                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1190
1191                         if (bond_is_lb(bond))
1192                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1193                 } else {
1194                         if (bond_uses_primary(bond))
1195                                 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1196                 }
1197         }
1198
1199         if (bond_uses_primary(bond))
1200                 bond_hw_addr_swap(bond, new_active, old_active);
1201
1202         if (bond_is_lb(bond)) {
1203                 bond_alb_handle_active_change(bond, new_active);
1204                 if (old_active)
1205                         bond_set_slave_inactive_flags(old_active,
1206                                                       BOND_SLAVE_NOTIFY_NOW);
1207                 if (new_active)
1208                         bond_set_slave_active_flags(new_active,
1209                                                     BOND_SLAVE_NOTIFY_NOW);
1210         } else {
1211                 rcu_assign_pointer(bond->curr_active_slave, new_active);
1212         }
1213
1214         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1215                 if (old_active)
1216                         bond_set_slave_inactive_flags(old_active,
1217                                                       BOND_SLAVE_NOTIFY_NOW);
1218
1219                 if (new_active) {
1220                         bool should_notify_peers = false;
1221
1222                         bond_set_slave_active_flags(new_active,
1223                                                     BOND_SLAVE_NOTIFY_NOW);
1224
1225                         if (bond->params.fail_over_mac)
1226                                 bond_do_fail_over_mac(bond, new_active,
1227                                                       old_active);
1228
1229                         if (netif_running(bond->dev)) {
1230                                 bond->send_peer_notif =
1231                                         bond->params.num_peer_notif *
1232                                         max(1, bond->params.peer_notif_delay);
1233                                 should_notify_peers =
1234                                         bond_should_notify_peers(bond);
1235                         }
1236
1237                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1238                         if (should_notify_peers) {
1239                                 bond->send_peer_notif--;
1240                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1241                                                          bond->dev);
1242                         }
1243                 }
1244         }
1245
1246 #ifdef CONFIG_XFRM_OFFLOAD
1247         bond_ipsec_add_sa_all(bond);
1248 #endif /* CONFIG_XFRM_OFFLOAD */
1249
1250         /* resend IGMP joins since active slave has changed or
1251          * all were sent on curr_active_slave.
1252          * resend only if bond is brought up with the affected
1253          * bonding modes and the retransmission is enabled
1254          */
1255         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1256             ((bond_uses_primary(bond) && new_active) ||
1257              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1258                 bond->igmp_retrans = bond->params.resend_igmp;
1259                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1260         }
1261 }
1262
1263 /**
1264  * bond_select_active_slave - select a new active slave, if needed
1265  * @bond: our bonding struct
1266  *
1267  * This functions should be called when one of the following occurs:
1268  * - The old curr_active_slave has been released or lost its link.
1269  * - The primary_slave has got its link back.
1270  * - A slave has got its link back and there's no old curr_active_slave.
1271  *
1272  * Caller must hold RTNL.
1273  */
1274 void bond_select_active_slave(struct bonding *bond)
1275 {
1276         struct slave *best_slave;
1277         int rv;
1278
1279         ASSERT_RTNL();
1280
1281         best_slave = bond_find_best_slave(bond);
1282         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1283                 bond_change_active_slave(bond, best_slave);
1284                 rv = bond_set_carrier(bond);
1285                 if (!rv)
1286                         return;
1287
1288                 if (netif_carrier_ok(bond->dev))
1289                         netdev_info(bond->dev, "active interface up!\n");
1290                 else
1291                         netdev_info(bond->dev, "now running without any active interface!\n");
1292         }
1293 }
1294
1295 #ifdef CONFIG_NET_POLL_CONTROLLER
1296 static inline int slave_enable_netpoll(struct slave *slave)
1297 {
1298         struct netpoll *np;
1299         int err = 0;
1300
1301         np = kzalloc(sizeof(*np), GFP_KERNEL);
1302         err = -ENOMEM;
1303         if (!np)
1304                 goto out;
1305
1306         err = __netpoll_setup(np, slave->dev);
1307         if (err) {
1308                 kfree(np);
1309                 goto out;
1310         }
1311         slave->np = np;
1312 out:
1313         return err;
1314 }
1315 static inline void slave_disable_netpoll(struct slave *slave)
1316 {
1317         struct netpoll *np = slave->np;
1318
1319         if (!np)
1320                 return;
1321
1322         slave->np = NULL;
1323
1324         __netpoll_free(np);
1325 }
1326
1327 static void bond_poll_controller(struct net_device *bond_dev)
1328 {
1329         struct bonding *bond = netdev_priv(bond_dev);
1330         struct slave *slave = NULL;
1331         struct list_head *iter;
1332         struct ad_info ad_info;
1333
1334         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1335                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
1336                         return;
1337
1338         bond_for_each_slave_rcu(bond, slave, iter) {
1339                 if (!bond_slave_is_up(slave))
1340                         continue;
1341
1342                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1343                         struct aggregator *agg =
1344                             SLAVE_AD_INFO(slave)->port.aggregator;
1345
1346                         if (agg &&
1347                             agg->aggregator_identifier != ad_info.aggregator_id)
1348                                 continue;
1349                 }
1350
1351                 netpoll_poll_dev(slave->dev);
1352         }
1353 }
1354
1355 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1356 {
1357         struct bonding *bond = netdev_priv(bond_dev);
1358         struct list_head *iter;
1359         struct slave *slave;
1360
1361         bond_for_each_slave(bond, slave, iter)
1362                 if (bond_slave_is_up(slave))
1363                         slave_disable_netpoll(slave);
1364 }
1365
1366 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1367 {
1368         struct bonding *bond = netdev_priv(dev);
1369         struct list_head *iter;
1370         struct slave *slave;
1371         int err = 0;
1372
1373         bond_for_each_slave(bond, slave, iter) {
1374                 err = slave_enable_netpoll(slave);
1375                 if (err) {
1376                         bond_netpoll_cleanup(dev);
1377                         break;
1378                 }
1379         }
1380         return err;
1381 }
1382 #else
1383 static inline int slave_enable_netpoll(struct slave *slave)
1384 {
1385         return 0;
1386 }
1387 static inline void slave_disable_netpoll(struct slave *slave)
1388 {
1389 }
1390 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1391 {
1392 }
1393 #endif
1394
1395 /*---------------------------------- IOCTL ----------------------------------*/
1396
1397 static netdev_features_t bond_fix_features(struct net_device *dev,
1398                                            netdev_features_t features)
1399 {
1400         struct bonding *bond = netdev_priv(dev);
1401         struct list_head *iter;
1402         netdev_features_t mask;
1403         struct slave *slave;
1404
1405         mask = features;
1406
1407         features &= ~NETIF_F_ONE_FOR_ALL;
1408         features |= NETIF_F_ALL_FOR_ALL;
1409
1410         bond_for_each_slave(bond, slave, iter) {
1411                 features = netdev_increment_features(features,
1412                                                      slave->dev->features,
1413                                                      mask);
1414         }
1415         features = netdev_add_tso_features(features, mask);
1416
1417         return features;
1418 }
1419
1420 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1421                                  NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \
1422                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1423
1424 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1425                                  NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE)
1426
1427 #define BOND_MPLS_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1428                                  NETIF_F_GSO_SOFTWARE)
1429
1430
1431 static void bond_compute_features(struct bonding *bond)
1432 {
1433         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1434                                         IFF_XMIT_DST_RELEASE_PERM;
1435         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1436         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1437 #ifdef CONFIG_XFRM_OFFLOAD
1438         netdev_features_t xfrm_features  = BOND_XFRM_FEATURES;
1439 #endif /* CONFIG_XFRM_OFFLOAD */
1440         netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1441         struct net_device *bond_dev = bond->dev;
1442         struct list_head *iter;
1443         struct slave *slave;
1444         unsigned short max_hard_header_len = ETH_HLEN;
1445         unsigned int tso_max_size = TSO_MAX_SIZE;
1446         u16 tso_max_segs = TSO_MAX_SEGS;
1447
1448         if (!bond_has_slaves(bond))
1449                 goto done;
1450         vlan_features &= NETIF_F_ALL_FOR_ALL;
1451         mpls_features &= NETIF_F_ALL_FOR_ALL;
1452
1453         bond_for_each_slave(bond, slave, iter) {
1454                 vlan_features = netdev_increment_features(vlan_features,
1455                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1456
1457                 enc_features = netdev_increment_features(enc_features,
1458                                                          slave->dev->hw_enc_features,
1459                                                          BOND_ENC_FEATURES);
1460
1461 #ifdef CONFIG_XFRM_OFFLOAD
1462                 xfrm_features = netdev_increment_features(xfrm_features,
1463                                                           slave->dev->hw_enc_features,
1464                                                           BOND_XFRM_FEATURES);
1465 #endif /* CONFIG_XFRM_OFFLOAD */
1466
1467                 mpls_features = netdev_increment_features(mpls_features,
1468                                                           slave->dev->mpls_features,
1469                                                           BOND_MPLS_FEATURES);
1470
1471                 dst_release_flag &= slave->dev->priv_flags;
1472                 if (slave->dev->hard_header_len > max_hard_header_len)
1473                         max_hard_header_len = slave->dev->hard_header_len;
1474
1475                 tso_max_size = min(tso_max_size, slave->dev->tso_max_size);
1476                 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs);
1477         }
1478         bond_dev->hard_header_len = max_hard_header_len;
1479
1480 done:
1481         bond_dev->vlan_features = vlan_features;
1482         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1483                                     NETIF_F_HW_VLAN_CTAG_TX |
1484                                     NETIF_F_HW_VLAN_STAG_TX;
1485 #ifdef CONFIG_XFRM_OFFLOAD
1486         bond_dev->hw_enc_features |= xfrm_features;
1487 #endif /* CONFIG_XFRM_OFFLOAD */
1488         bond_dev->mpls_features = mpls_features;
1489         netif_set_tso_max_segs(bond_dev, tso_max_segs);
1490         netif_set_tso_max_size(bond_dev, tso_max_size);
1491
1492         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1493         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1494             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1495                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1496
1497         netdev_change_features(bond_dev);
1498 }
1499
1500 static void bond_setup_by_slave(struct net_device *bond_dev,
1501                                 struct net_device *slave_dev)
1502 {
1503         bool was_up = !!(bond_dev->flags & IFF_UP);
1504
1505         dev_close(bond_dev);
1506
1507         bond_dev->header_ops        = slave_dev->header_ops;
1508
1509         bond_dev->type              = slave_dev->type;
1510         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1511         bond_dev->needed_headroom   = slave_dev->needed_headroom;
1512         bond_dev->addr_len          = slave_dev->addr_len;
1513
1514         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1515                 slave_dev->addr_len);
1516
1517         if (slave_dev->flags & IFF_POINTOPOINT) {
1518                 bond_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
1519                 bond_dev->flags |= (IFF_POINTOPOINT | IFF_NOARP);
1520         }
1521         if (was_up)
1522                 dev_open(bond_dev, NULL);
1523 }
1524
1525 /* On bonding slaves other than the currently active slave, suppress
1526  * duplicates except for alb non-mcast/bcast.
1527  */
1528 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1529                                             struct slave *slave,
1530                                             struct bonding *bond)
1531 {
1532         if (bond_is_slave_inactive(slave)) {
1533                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1534                     skb->pkt_type != PACKET_BROADCAST &&
1535                     skb->pkt_type != PACKET_MULTICAST)
1536                         return false;
1537                 return true;
1538         }
1539         return false;
1540 }
1541
1542 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1543 {
1544         struct sk_buff *skb = *pskb;
1545         struct slave *slave;
1546         struct bonding *bond;
1547         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1548                           struct slave *);
1549         int ret = RX_HANDLER_ANOTHER;
1550
1551         skb = skb_share_check(skb, GFP_ATOMIC);
1552         if (unlikely(!skb))
1553                 return RX_HANDLER_CONSUMED;
1554
1555         *pskb = skb;
1556
1557         slave = bond_slave_get_rcu(skb->dev);
1558         bond = slave->bond;
1559
1560         recv_probe = READ_ONCE(bond->recv_probe);
1561         if (recv_probe) {
1562                 ret = recv_probe(skb, bond, slave);
1563                 if (ret == RX_HANDLER_CONSUMED) {
1564                         consume_skb(skb);
1565                         return ret;
1566                 }
1567         }
1568
1569         /*
1570          * For packets determined by bond_should_deliver_exact_match() call to
1571          * be suppressed we want to make an exception for link-local packets.
1572          * This is necessary for e.g. LLDP daemons to be able to monitor
1573          * inactive slave links without being forced to bind to them
1574          * explicitly.
1575          *
1576          * At the same time, packets that are passed to the bonding master
1577          * (including link-local ones) can have their originating interface
1578          * determined via PACKET_ORIGDEV socket option.
1579          */
1580         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1581                 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1582                         return RX_HANDLER_PASS;
1583                 return RX_HANDLER_EXACT;
1584         }
1585
1586         skb->dev = bond->dev;
1587
1588         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1589             netif_is_bridge_port(bond->dev) &&
1590             skb->pkt_type == PACKET_HOST) {
1591
1592                 if (unlikely(skb_cow_head(skb,
1593                                           skb->data - skb_mac_header(skb)))) {
1594                         kfree_skb(skb);
1595                         return RX_HANDLER_CONSUMED;
1596                 }
1597                 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1598                                   bond->dev->addr_len);
1599         }
1600
1601         return ret;
1602 }
1603
1604 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1605 {
1606         switch (BOND_MODE(bond)) {
1607         case BOND_MODE_ROUNDROBIN:
1608                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1609         case BOND_MODE_ACTIVEBACKUP:
1610                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1611         case BOND_MODE_BROADCAST:
1612                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1613         case BOND_MODE_XOR:
1614         case BOND_MODE_8023AD:
1615                 return NETDEV_LAG_TX_TYPE_HASH;
1616         default:
1617                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1618         }
1619 }
1620
1621 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1622                                                enum netdev_lag_tx_type type)
1623 {
1624         if (type != NETDEV_LAG_TX_TYPE_HASH)
1625                 return NETDEV_LAG_HASH_NONE;
1626
1627         switch (bond->params.xmit_policy) {
1628         case BOND_XMIT_POLICY_LAYER2:
1629                 return NETDEV_LAG_HASH_L2;
1630         case BOND_XMIT_POLICY_LAYER34:
1631                 return NETDEV_LAG_HASH_L34;
1632         case BOND_XMIT_POLICY_LAYER23:
1633                 return NETDEV_LAG_HASH_L23;
1634         case BOND_XMIT_POLICY_ENCAP23:
1635                 return NETDEV_LAG_HASH_E23;
1636         case BOND_XMIT_POLICY_ENCAP34:
1637                 return NETDEV_LAG_HASH_E34;
1638         case BOND_XMIT_POLICY_VLAN_SRCMAC:
1639                 return NETDEV_LAG_HASH_VLAN_SRCMAC;
1640         default:
1641                 return NETDEV_LAG_HASH_UNKNOWN;
1642         }
1643 }
1644
1645 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1646                                       struct netlink_ext_ack *extack)
1647 {
1648         struct netdev_lag_upper_info lag_upper_info;
1649         enum netdev_lag_tx_type type;
1650         int err;
1651
1652         type = bond_lag_tx_type(bond);
1653         lag_upper_info.tx_type = type;
1654         lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1655
1656         err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1657                                            &lag_upper_info, extack);
1658         if (err)
1659                 return err;
1660
1661         slave->dev->flags |= IFF_SLAVE;
1662         return 0;
1663 }
1664
1665 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1666 {
1667         netdev_upper_dev_unlink(slave->dev, bond->dev);
1668         slave->dev->flags &= ~IFF_SLAVE;
1669 }
1670
1671 static void slave_kobj_release(struct kobject *kobj)
1672 {
1673         struct slave *slave = to_slave(kobj);
1674         struct bonding *bond = bond_get_bond_by_slave(slave);
1675
1676         cancel_delayed_work_sync(&slave->notify_work);
1677         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1678                 kfree(SLAVE_AD_INFO(slave));
1679
1680         kfree(slave);
1681 }
1682
1683 static struct kobj_type slave_ktype = {
1684         .release = slave_kobj_release,
1685 #ifdef CONFIG_SYSFS
1686         .sysfs_ops = &slave_sysfs_ops,
1687 #endif
1688 };
1689
1690 static int bond_kobj_init(struct slave *slave)
1691 {
1692         int err;
1693
1694         err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1695                                    &(slave->dev->dev.kobj), "bonding_slave");
1696         if (err)
1697                 kobject_put(&slave->kobj);
1698
1699         return err;
1700 }
1701
1702 static struct slave *bond_alloc_slave(struct bonding *bond,
1703                                       struct net_device *slave_dev)
1704 {
1705         struct slave *slave = NULL;
1706
1707         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1708         if (!slave)
1709                 return NULL;
1710
1711         slave->bond = bond;
1712         slave->dev = slave_dev;
1713         INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1714
1715         if (bond_kobj_init(slave))
1716                 return NULL;
1717
1718         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1719                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1720                                                GFP_KERNEL);
1721                 if (!SLAVE_AD_INFO(slave)) {
1722                         kobject_put(&slave->kobj);
1723                         return NULL;
1724                 }
1725         }
1726
1727         return slave;
1728 }
1729
1730 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1731 {
1732         info->bond_mode = BOND_MODE(bond);
1733         info->miimon = bond->params.miimon;
1734         info->num_slaves = bond->slave_cnt;
1735 }
1736
1737 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1738 {
1739         strcpy(info->slave_name, slave->dev->name);
1740         info->link = slave->link;
1741         info->state = bond_slave_state(slave);
1742         info->link_failure_count = slave->link_failure_count;
1743 }
1744
1745 static void bond_netdev_notify_work(struct work_struct *_work)
1746 {
1747         struct slave *slave = container_of(_work, struct slave,
1748                                            notify_work.work);
1749
1750         if (rtnl_trylock()) {
1751                 struct netdev_bonding_info binfo;
1752
1753                 bond_fill_ifslave(slave, &binfo.slave);
1754                 bond_fill_ifbond(slave->bond, &binfo.master);
1755                 netdev_bonding_info_change(slave->dev, &binfo);
1756                 rtnl_unlock();
1757         } else {
1758                 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1759         }
1760 }
1761
1762 void bond_queue_slave_event(struct slave *slave)
1763 {
1764         queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1765 }
1766
1767 void bond_lower_state_changed(struct slave *slave)
1768 {
1769         struct netdev_lag_lower_state_info info;
1770
1771         info.link_up = slave->link == BOND_LINK_UP ||
1772                        slave->link == BOND_LINK_FAIL;
1773         info.tx_enabled = bond_is_active_slave(slave);
1774         netdev_lower_state_changed(slave->dev, &info);
1775 }
1776
1777 #define BOND_NL_ERR(bond_dev, extack, errmsg) do {              \
1778         if (extack)                                             \
1779                 NL_SET_ERR_MSG(extack, errmsg);                 \
1780         else                                                    \
1781                 netdev_err(bond_dev, "Error: %s\n", errmsg);    \
1782 } while (0)
1783
1784 #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do {          \
1785         if (extack)                                                     \
1786                 NL_SET_ERR_MSG(extack, errmsg);                         \
1787         else                                                            \
1788                 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg);  \
1789 } while (0)
1790
1791 /* The bonding driver uses ether_setup() to convert a master bond device
1792  * to ARPHRD_ETHER, that resets the target netdevice's flags so we always
1793  * have to restore the IFF_MASTER flag, and only restore IFF_SLAVE and IFF_UP
1794  * if they were set
1795  */
1796 static void bond_ether_setup(struct net_device *bond_dev)
1797 {
1798         unsigned int flags = bond_dev->flags & (IFF_SLAVE | IFF_UP);
1799
1800         ether_setup(bond_dev);
1801         bond_dev->flags |= IFF_MASTER | flags;
1802         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1803 }
1804
1805 void bond_xdp_set_features(struct net_device *bond_dev)
1806 {
1807         struct bonding *bond = netdev_priv(bond_dev);
1808         xdp_features_t val = NETDEV_XDP_ACT_MASK;
1809         struct list_head *iter;
1810         struct slave *slave;
1811
1812         ASSERT_RTNL();
1813
1814         if (!bond_xdp_check(bond)) {
1815                 xdp_clear_features_flag(bond_dev);
1816                 return;
1817         }
1818
1819         bond_for_each_slave(bond, slave, iter)
1820                 val &= slave->dev->xdp_features;
1821
1822         val &= ~NETDEV_XDP_ACT_XSK_ZEROCOPY;
1823
1824         xdp_set_features_flag(bond_dev, val);
1825 }
1826
1827 /* enslave device <slave> to bond device <master> */
1828 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1829                  struct netlink_ext_ack *extack)
1830 {
1831         struct bonding *bond = netdev_priv(bond_dev);
1832         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1833         struct slave *new_slave = NULL, *prev_slave;
1834         struct sockaddr_storage ss;
1835         int link_reporting;
1836         int res = 0, i;
1837
1838         if (slave_dev->flags & IFF_MASTER &&
1839             !netif_is_bond_master(slave_dev)) {
1840                 BOND_NL_ERR(bond_dev, extack,
1841                             "Device type (master device) cannot be enslaved");
1842                 return -EPERM;
1843         }
1844
1845         if (!bond->params.use_carrier &&
1846             slave_dev->ethtool_ops->get_link == NULL &&
1847             slave_ops->ndo_eth_ioctl == NULL) {
1848                 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1849         }
1850
1851         /* already in-use? */
1852         if (netdev_is_rx_handler_busy(slave_dev)) {
1853                 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1854                              "Device is in use and cannot be enslaved");
1855                 return -EBUSY;
1856         }
1857
1858         if (bond_dev == slave_dev) {
1859                 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself.");
1860                 return -EPERM;
1861         }
1862
1863         /* vlan challenged mutual exclusion */
1864         /* no need to lock since we're protected by rtnl_lock */
1865         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1866                 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1867                 if (vlan_uses_dev(bond_dev)) {
1868                         SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1869                                      "Can not enslave VLAN challenged device to VLAN enabled bond");
1870                         return -EPERM;
1871                 } else {
1872                         slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1873                 }
1874         } else {
1875                 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1876         }
1877
1878         if (slave_dev->features & NETIF_F_HW_ESP)
1879                 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1880
1881         /* Old ifenslave binaries are no longer supported.  These can
1882          * be identified with moderate accuracy by the state of the slave:
1883          * the current ifenslave will set the interface down prior to
1884          * enslaving it; the old ifenslave will not.
1885          */
1886         if (slave_dev->flags & IFF_UP) {
1887                 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1888                              "Device can not be enslaved while up");
1889                 return -EPERM;
1890         }
1891
1892         /* set bonding device ether type by slave - bonding netdevices are
1893          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1894          * there is a need to override some of the type dependent attribs/funcs.
1895          *
1896          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1897          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1898          */
1899         if (!bond_has_slaves(bond)) {
1900                 if (bond_dev->type != slave_dev->type) {
1901                         slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1902                                   bond_dev->type, slave_dev->type);
1903
1904                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1905                                                        bond_dev);
1906                         res = notifier_to_errno(res);
1907                         if (res) {
1908                                 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1909                                 return -EBUSY;
1910                         }
1911
1912                         /* Flush unicast and multicast addresses */
1913                         dev_uc_flush(bond_dev);
1914                         dev_mc_flush(bond_dev);
1915
1916                         if (slave_dev->type != ARPHRD_ETHER)
1917                                 bond_setup_by_slave(bond_dev, slave_dev);
1918                         else
1919                                 bond_ether_setup(bond_dev);
1920
1921                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1922                                                  bond_dev);
1923                 }
1924         } else if (bond_dev->type != slave_dev->type) {
1925                 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1926                              "Device type is different from other slaves");
1927                 return -EINVAL;
1928         }
1929
1930         if (slave_dev->type == ARPHRD_INFINIBAND &&
1931             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1932                 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1933                              "Only active-backup mode is supported for infiniband slaves");
1934                 res = -EOPNOTSUPP;
1935                 goto err_undo_flags;
1936         }
1937
1938         if (!slave_ops->ndo_set_mac_address ||
1939             slave_dev->type == ARPHRD_INFINIBAND) {
1940                 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1941                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1942                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1943                         if (!bond_has_slaves(bond)) {
1944                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1945                                 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1946                         } else {
1947                                 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1948                                              "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1949                                 res = -EOPNOTSUPP;
1950                                 goto err_undo_flags;
1951                         }
1952                 }
1953         }
1954
1955         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1956
1957         /* If this is the first slave, then we need to set the master's hardware
1958          * address to be the same as the slave's.
1959          */
1960         if (!bond_has_slaves(bond) &&
1961             bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1962                 res = bond_set_dev_addr(bond->dev, slave_dev);
1963                 if (res)
1964                         goto err_undo_flags;
1965         }
1966
1967         new_slave = bond_alloc_slave(bond, slave_dev);
1968         if (!new_slave) {
1969                 res = -ENOMEM;
1970                 goto err_undo_flags;
1971         }
1972
1973         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1974          * is set via sysfs or module option if desired.
1975          */
1976         new_slave->queue_id = 0;
1977
1978         /* Save slave's original mtu and then set it to match the bond */
1979         new_slave->original_mtu = slave_dev->mtu;
1980         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1981         if (res) {
1982                 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1983                 goto err_free;
1984         }
1985
1986         /* Save slave's original ("permanent") mac address for modes
1987          * that need it, and for restoring it upon release, and then
1988          * set it to the master's address
1989          */
1990         bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1991                           slave_dev->addr_len);
1992
1993         if (!bond->params.fail_over_mac ||
1994             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1995                 /* Set slave to master's mac address.  The application already
1996                  * set the master's mac address to that of the first slave
1997                  */
1998                 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1999                 ss.ss_family = slave_dev->type;
2000                 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
2001                                           extack);
2002                 if (res) {
2003                         slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
2004                         goto err_restore_mtu;
2005                 }
2006         }
2007
2008         /* set no_addrconf flag before open to prevent IPv6 addrconf */
2009         slave_dev->priv_flags |= IFF_NO_ADDRCONF;
2010
2011         /* open the slave since the application closed it */
2012         res = dev_open(slave_dev, extack);
2013         if (res) {
2014                 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
2015                 goto err_restore_mac;
2016         }
2017
2018         slave_dev->priv_flags |= IFF_BONDING;
2019         /* initialize slave stats */
2020         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
2021
2022         if (bond_is_lb(bond)) {
2023                 /* bond_alb_init_slave() must be called before all other stages since
2024                  * it might fail and we do not want to have to undo everything
2025                  */
2026                 res = bond_alb_init_slave(bond, new_slave);
2027                 if (res)
2028                         goto err_close;
2029         }
2030
2031         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
2032         if (res) {
2033                 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
2034                 goto err_close;
2035         }
2036
2037         prev_slave = bond_last_slave(bond);
2038
2039         new_slave->delay = 0;
2040         new_slave->link_failure_count = 0;
2041
2042         if (bond_update_speed_duplex(new_slave) &&
2043             bond_needs_speed_duplex(bond))
2044                 new_slave->link = BOND_LINK_DOWN;
2045
2046         new_slave->last_rx = jiffies -
2047                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
2048         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
2049                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
2050
2051         new_slave->last_tx = new_slave->last_rx;
2052
2053         if (bond->params.miimon && !bond->params.use_carrier) {
2054                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
2055
2056                 if ((link_reporting == -1) && !bond->params.arp_interval) {
2057                         /* miimon is set but a bonded network driver
2058                          * does not support ETHTOOL/MII and
2059                          * arp_interval is not set.  Note: if
2060                          * use_carrier is enabled, we will never go
2061                          * here (because netif_carrier is always
2062                          * supported); thus, we don't need to change
2063                          * the messages for netif_carrier.
2064                          */
2065                         slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n");
2066                 } else if (link_reporting == -1) {
2067                         /* unable get link status using mii/ethtool */
2068                         slave_warn(bond_dev, slave_dev, "can't get link status from slave; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n");
2069                 }
2070         }
2071
2072         /* check for initial state */
2073         new_slave->link = BOND_LINK_NOCHANGE;
2074         if (bond->params.miimon) {
2075                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
2076                         if (bond->params.updelay) {
2077                                 bond_set_slave_link_state(new_slave,
2078                                                           BOND_LINK_BACK,
2079                                                           BOND_SLAVE_NOTIFY_NOW);
2080                                 new_slave->delay = bond->params.updelay;
2081                         } else {
2082                                 bond_set_slave_link_state(new_slave,
2083                                                           BOND_LINK_UP,
2084                                                           BOND_SLAVE_NOTIFY_NOW);
2085                         }
2086                 } else {
2087                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
2088                                                   BOND_SLAVE_NOTIFY_NOW);
2089                 }
2090         } else if (bond->params.arp_interval) {
2091                 bond_set_slave_link_state(new_slave,
2092                                           (netif_carrier_ok(slave_dev) ?
2093                                           BOND_LINK_UP : BOND_LINK_DOWN),
2094                                           BOND_SLAVE_NOTIFY_NOW);
2095         } else {
2096                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
2097                                           BOND_SLAVE_NOTIFY_NOW);
2098         }
2099
2100         if (new_slave->link != BOND_LINK_DOWN)
2101                 new_slave->last_link_up = jiffies;
2102         slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
2103                   new_slave->link == BOND_LINK_DOWN ? "DOWN" :
2104                   (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
2105
2106         if (bond_uses_primary(bond) && bond->params.primary[0]) {
2107                 /* if there is a primary slave, remember it */
2108                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
2109                         rcu_assign_pointer(bond->primary_slave, new_slave);
2110                         bond->force_primary = true;
2111                 }
2112         }
2113
2114         switch (BOND_MODE(bond)) {
2115         case BOND_MODE_ACTIVEBACKUP:
2116                 bond_set_slave_inactive_flags(new_slave,
2117                                               BOND_SLAVE_NOTIFY_NOW);
2118                 break;
2119         case BOND_MODE_8023AD:
2120                 /* in 802.3ad mode, the internal mechanism
2121                  * will activate the slaves in the selected
2122                  * aggregator
2123                  */
2124                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
2125                 /* if this is the first slave */
2126                 if (!prev_slave) {
2127                         SLAVE_AD_INFO(new_slave)->id = 1;
2128                         /* Initialize AD with the number of times that the AD timer is called in 1 second
2129                          * can be called only after the mac address of the bond is set
2130                          */
2131                         bond_3ad_initialize(bond);
2132                 } else {
2133                         SLAVE_AD_INFO(new_slave)->id =
2134                                 SLAVE_AD_INFO(prev_slave)->id + 1;
2135                 }
2136
2137                 bond_3ad_bind_slave(new_slave);
2138                 break;
2139         case BOND_MODE_TLB:
2140         case BOND_MODE_ALB:
2141                 bond_set_active_slave(new_slave);
2142                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
2143                 break;
2144         default:
2145                 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
2146
2147                 /* always active in trunk mode */
2148                 bond_set_active_slave(new_slave);
2149
2150                 /* In trunking mode there is little meaning to curr_active_slave
2151                  * anyway (it holds no special properties of the bond device),
2152                  * so we can change it without calling change_active_interface()
2153                  */
2154                 if (!rcu_access_pointer(bond->curr_active_slave) &&
2155                     new_slave->link == BOND_LINK_UP)
2156                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
2157
2158                 break;
2159         } /* switch(bond_mode) */
2160
2161 #ifdef CONFIG_NET_POLL_CONTROLLER
2162         if (bond->dev->npinfo) {
2163                 if (slave_enable_netpoll(new_slave)) {
2164                         slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
2165                         res = -EBUSY;
2166                         goto err_detach;
2167                 }
2168         }
2169 #endif
2170
2171         if (!(bond_dev->features & NETIF_F_LRO))
2172                 dev_disable_lro(slave_dev);
2173
2174         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
2175                                          new_slave);
2176         if (res) {
2177                 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
2178                 goto err_detach;
2179         }
2180
2181         res = bond_master_upper_dev_link(bond, new_slave, extack);
2182         if (res) {
2183                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
2184                 goto err_unregister;
2185         }
2186
2187         bond_lower_state_changed(new_slave);
2188
2189         res = bond_sysfs_slave_add(new_slave);
2190         if (res) {
2191                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
2192                 goto err_upper_unlink;
2193         }
2194
2195         /* If the mode uses primary, then the following is handled by
2196          * bond_change_active_slave().
2197          */
2198         if (!bond_uses_primary(bond)) {
2199                 /* set promiscuity level to new slave */
2200                 if (bond_dev->flags & IFF_PROMISC) {
2201                         res = dev_set_promiscuity(slave_dev, 1);
2202                         if (res)
2203                                 goto err_sysfs_del;
2204                 }
2205
2206                 /* set allmulti level to new slave */
2207                 if (bond_dev->flags & IFF_ALLMULTI) {
2208                         res = dev_set_allmulti(slave_dev, 1);
2209                         if (res) {
2210                                 if (bond_dev->flags & IFF_PROMISC)
2211                                         dev_set_promiscuity(slave_dev, -1);
2212                                 goto err_sysfs_del;
2213                         }
2214                 }
2215
2216                 if (bond_dev->flags & IFF_UP) {
2217                         netif_addr_lock_bh(bond_dev);
2218                         dev_mc_sync_multiple(slave_dev, bond_dev);
2219                         dev_uc_sync_multiple(slave_dev, bond_dev);
2220                         netif_addr_unlock_bh(bond_dev);
2221
2222                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2223                                 dev_mc_add(slave_dev, lacpdu_mcast_addr);
2224                 }
2225         }
2226
2227         bond->slave_cnt++;
2228         bond_compute_features(bond);
2229         bond_set_carrier(bond);
2230
2231         if (bond_uses_primary(bond)) {
2232                 block_netpoll_tx();
2233                 bond_select_active_slave(bond);
2234                 unblock_netpoll_tx();
2235         }
2236
2237         if (bond_mode_can_use_xmit_hash(bond))
2238                 bond_update_slave_arr(bond, NULL);
2239
2240
2241         if (!slave_dev->netdev_ops->ndo_bpf ||
2242             !slave_dev->netdev_ops->ndo_xdp_xmit) {
2243                 if (bond->xdp_prog) {
2244                         SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2245                                      "Slave does not support XDP");
2246                         res = -EOPNOTSUPP;
2247                         goto err_sysfs_del;
2248                 }
2249         } else if (bond->xdp_prog) {
2250                 struct netdev_bpf xdp = {
2251                         .command = XDP_SETUP_PROG,
2252                         .flags   = 0,
2253                         .prog    = bond->xdp_prog,
2254                         .extack  = extack,
2255                 };
2256
2257                 if (dev_xdp_prog_count(slave_dev) > 0) {
2258                         SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2259                                      "Slave has XDP program loaded, please unload before enslaving");
2260                         res = -EOPNOTSUPP;
2261                         goto err_sysfs_del;
2262                 }
2263
2264                 res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
2265                 if (res < 0) {
2266                         /* ndo_bpf() sets extack error message */
2267                         slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res);
2268                         goto err_sysfs_del;
2269                 }
2270                 if (bond->xdp_prog)
2271                         bpf_prog_inc(bond->xdp_prog);
2272         }
2273
2274         bond_xdp_set_features(bond_dev);
2275
2276         slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
2277                    bond_is_active_slave(new_slave) ? "an active" : "a backup",
2278                    new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
2279
2280         /* enslave is successful */
2281         bond_queue_slave_event(new_slave);
2282         return 0;
2283
2284 /* Undo stages on error */
2285 err_sysfs_del:
2286         bond_sysfs_slave_del(new_slave);
2287
2288 err_upper_unlink:
2289         bond_upper_dev_unlink(bond, new_slave);
2290
2291 err_unregister:
2292         netdev_rx_handler_unregister(slave_dev);
2293
2294 err_detach:
2295         vlan_vids_del_by_dev(slave_dev, bond_dev);
2296         if (rcu_access_pointer(bond->primary_slave) == new_slave)
2297                 RCU_INIT_POINTER(bond->primary_slave, NULL);
2298         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
2299                 block_netpoll_tx();
2300                 bond_change_active_slave(bond, NULL);
2301                 bond_select_active_slave(bond);
2302                 unblock_netpoll_tx();
2303         }
2304         /* either primary_slave or curr_active_slave might've changed */
2305         synchronize_rcu();
2306         slave_disable_netpoll(new_slave);
2307
2308 err_close:
2309         if (!netif_is_bond_master(slave_dev))
2310                 slave_dev->priv_flags &= ~IFF_BONDING;
2311         dev_close(slave_dev);
2312
2313 err_restore_mac:
2314         slave_dev->priv_flags &= ~IFF_NO_ADDRCONF;
2315         if (!bond->params.fail_over_mac ||
2316             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2317                 /* XXX TODO - fom follow mode needs to change master's
2318                  * MAC if this slave's MAC is in use by the bond, or at
2319                  * least print a warning.
2320                  */
2321                 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2322                                   new_slave->dev->addr_len);
2323                 ss.ss_family = slave_dev->type;
2324                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2325         }
2326
2327 err_restore_mtu:
2328         dev_set_mtu(slave_dev, new_slave->original_mtu);
2329
2330 err_free:
2331         kobject_put(&new_slave->kobj);
2332
2333 err_undo_flags:
2334         /* Enslave of first slave has failed and we need to fix master's mac */
2335         if (!bond_has_slaves(bond)) {
2336                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
2337                                             slave_dev->dev_addr))
2338                         eth_hw_addr_random(bond_dev);
2339                 if (bond_dev->type != ARPHRD_ETHER) {
2340                         dev_close(bond_dev);
2341                         bond_ether_setup(bond_dev);
2342                 }
2343         }
2344
2345         return res;
2346 }
2347
2348 /* Try to release the slave device <slave> from the bond device <master>
2349  * It is legal to access curr_active_slave without a lock because all the function
2350  * is RTNL-locked. If "all" is true it means that the function is being called
2351  * while destroying a bond interface and all slaves are being released.
2352  *
2353  * The rules for slave state should be:
2354  *   for Active/Backup:
2355  *     Active stays on all backups go down
2356  *   for Bonded connections:
2357  *     The first up interface should be left on and all others downed.
2358  */
2359 static int __bond_release_one(struct net_device *bond_dev,
2360                               struct net_device *slave_dev,
2361                               bool all, bool unregister)
2362 {
2363         struct bonding *bond = netdev_priv(bond_dev);
2364         struct slave *slave, *oldcurrent;
2365         struct sockaddr_storage ss;
2366         int old_flags = bond_dev->flags;
2367         netdev_features_t old_features = bond_dev->features;
2368
2369         /* slave is not a slave or master is not master of this slave */
2370         if (!(slave_dev->flags & IFF_SLAVE) ||
2371             !netdev_has_upper_dev(slave_dev, bond_dev)) {
2372                 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2373                 return -EINVAL;
2374         }
2375
2376         block_netpoll_tx();
2377
2378         slave = bond_get_slave_by_dev(bond, slave_dev);
2379         if (!slave) {
2380                 /* not a slave of this bond */
2381                 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2382                 unblock_netpoll_tx();
2383                 return -EINVAL;
2384         }
2385
2386         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2387
2388         bond_sysfs_slave_del(slave);
2389
2390         /* recompute stats just before removing the slave */
2391         bond_get_stats(bond->dev, &bond->bond_stats);
2392
2393         if (bond->xdp_prog) {
2394                 struct netdev_bpf xdp = {
2395                         .command = XDP_SETUP_PROG,
2396                         .flags   = 0,
2397                         .prog    = NULL,
2398                         .extack  = NULL,
2399                 };
2400                 if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp))
2401                         slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n");
2402         }
2403
2404         /* unregister rx_handler early so bond_handle_frame wouldn't be called
2405          * for this slave anymore.
2406          */
2407         netdev_rx_handler_unregister(slave_dev);
2408
2409         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2410                 bond_3ad_unbind_slave(slave);
2411
2412         bond_upper_dev_unlink(bond, slave);
2413
2414         if (bond_mode_can_use_xmit_hash(bond))
2415                 bond_update_slave_arr(bond, slave);
2416
2417         slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2418                     bond_is_active_slave(slave) ? "active" : "backup");
2419
2420         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2421
2422         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2423
2424         if (!all && (!bond->params.fail_over_mac ||
2425                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2426                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2427                     bond_has_slaves(bond))
2428                         slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n",
2429                                    slave->perm_hwaddr);
2430         }
2431
2432         if (rtnl_dereference(bond->primary_slave) == slave)
2433                 RCU_INIT_POINTER(bond->primary_slave, NULL);
2434
2435         if (oldcurrent == slave)
2436                 bond_change_active_slave(bond, NULL);
2437
2438         if (bond_is_lb(bond)) {
2439                 /* Must be called only after the slave has been
2440                  * detached from the list and the curr_active_slave
2441                  * has been cleared (if our_slave == old_current),
2442                  * but before a new active slave is selected.
2443                  */
2444                 bond_alb_deinit_slave(bond, slave);
2445         }
2446
2447         if (all) {
2448                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2449         } else if (oldcurrent == slave) {
2450                 /* Note that we hold RTNL over this sequence, so there
2451                  * is no concern that another slave add/remove event
2452                  * will interfere.
2453                  */
2454                 bond_select_active_slave(bond);
2455         }
2456
2457         bond_set_carrier(bond);
2458         if (!bond_has_slaves(bond))
2459                 eth_hw_addr_random(bond_dev);
2460
2461         unblock_netpoll_tx();
2462         synchronize_rcu();
2463         bond->slave_cnt--;
2464
2465         if (!bond_has_slaves(bond)) {
2466                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2467                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2468         }
2469
2470         bond_compute_features(bond);
2471         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2472             (old_features & NETIF_F_VLAN_CHALLENGED))
2473                 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2474
2475         vlan_vids_del_by_dev(slave_dev, bond_dev);
2476
2477         /* If the mode uses primary, then this case was handled above by
2478          * bond_change_active_slave(..., NULL)
2479          */
2480         if (!bond_uses_primary(bond)) {
2481                 /* unset promiscuity level from slave
2482                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
2483                  * of the IFF_PROMISC flag in the bond_dev, but we need the
2484                  * value of that flag before that change, as that was the value
2485                  * when this slave was attached, so we cache at the start of the
2486                  * function and use it here. Same goes for ALLMULTI below
2487                  */
2488                 if (old_flags & IFF_PROMISC)
2489                         dev_set_promiscuity(slave_dev, -1);
2490
2491                 /* unset allmulti level from slave */
2492                 if (old_flags & IFF_ALLMULTI)
2493                         dev_set_allmulti(slave_dev, -1);
2494
2495                 if (old_flags & IFF_UP)
2496                         bond_hw_addr_flush(bond_dev, slave_dev);
2497         }
2498
2499         slave_disable_netpoll(slave);
2500
2501         /* close slave before restoring its mac address */
2502         dev_close(slave_dev);
2503
2504         slave_dev->priv_flags &= ~IFF_NO_ADDRCONF;
2505
2506         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2507             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2508                 /* restore original ("permanent") mac address */
2509                 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2510                                   slave->dev->addr_len);
2511                 ss.ss_family = slave_dev->type;
2512                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2513         }
2514
2515         if (unregister)
2516                 __dev_set_mtu(slave_dev, slave->original_mtu);
2517         else
2518                 dev_set_mtu(slave_dev, slave->original_mtu);
2519
2520         if (!netif_is_bond_master(slave_dev))
2521                 slave_dev->priv_flags &= ~IFF_BONDING;
2522
2523         bond_xdp_set_features(bond_dev);
2524         kobject_put(&slave->kobj);
2525
2526         return 0;
2527 }
2528
2529 /* A wrapper used because of ndo_del_link */
2530 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2531 {
2532         return __bond_release_one(bond_dev, slave_dev, false, false);
2533 }
2534
2535 /* First release a slave and then destroy the bond if no more slaves are left.
2536  * Must be under rtnl_lock when this function is called.
2537  */
2538 static int bond_release_and_destroy(struct net_device *bond_dev,
2539                                     struct net_device *slave_dev)
2540 {
2541         struct bonding *bond = netdev_priv(bond_dev);
2542         int ret;
2543
2544         ret = __bond_release_one(bond_dev, slave_dev, false, true);
2545         if (ret == 0 && !bond_has_slaves(bond) &&
2546             bond_dev->reg_state != NETREG_UNREGISTERING) {
2547                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2548                 netdev_info(bond_dev, "Destroying bond\n");
2549                 bond_remove_proc_entry(bond);
2550                 unregister_netdevice(bond_dev);
2551         }
2552         return ret;
2553 }
2554
2555 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2556 {
2557         struct bonding *bond = netdev_priv(bond_dev);
2558
2559         bond_fill_ifbond(bond, info);
2560 }
2561
2562 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2563 {
2564         struct bonding *bond = netdev_priv(bond_dev);
2565         struct list_head *iter;
2566         int i = 0, res = -ENODEV;
2567         struct slave *slave;
2568
2569         bond_for_each_slave(bond, slave, iter) {
2570                 if (i++ == (int)info->slave_id) {
2571                         res = 0;
2572                         bond_fill_ifslave(slave, info);
2573                         break;
2574                 }
2575         }
2576
2577         return res;
2578 }
2579
2580 /*-------------------------------- Monitoring -------------------------------*/
2581
2582 /* called with rcu_read_lock() */
2583 static int bond_miimon_inspect(struct bonding *bond)
2584 {
2585         bool ignore_updelay = false;
2586         int link_state, commit = 0;
2587         struct list_head *iter;
2588         struct slave *slave;
2589
2590         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
2591                 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2592         } else {
2593                 struct bond_up_slave *usable_slaves;
2594
2595                 usable_slaves = rcu_dereference(bond->usable_slaves);
2596
2597                 if (usable_slaves && usable_slaves->count == 0)
2598                         ignore_updelay = true;
2599         }
2600
2601         bond_for_each_slave_rcu(bond, slave, iter) {
2602                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2603
2604                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2605
2606                 switch (slave->link) {
2607                 case BOND_LINK_UP:
2608                         if (link_state)
2609                                 continue;
2610
2611                         bond_propose_link_state(slave, BOND_LINK_FAIL);
2612                         commit++;
2613                         slave->delay = bond->params.downdelay;
2614                         if (slave->delay) {
2615                                 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2616                                            (BOND_MODE(bond) ==
2617                                             BOND_MODE_ACTIVEBACKUP) ?
2618                                             (bond_is_active_slave(slave) ?
2619                                              "active " : "backup ") : "",
2620                                            bond->params.downdelay * bond->params.miimon);
2621                         }
2622                         fallthrough;
2623                 case BOND_LINK_FAIL:
2624                         if (link_state) {
2625                                 /* recovered before downdelay expired */
2626                                 bond_propose_link_state(slave, BOND_LINK_UP);
2627                                 slave->last_link_up = jiffies;
2628                                 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2629                                            (bond->params.downdelay - slave->delay) *
2630                                            bond->params.miimon);
2631                                 commit++;
2632                                 continue;
2633                         }
2634
2635                         if (slave->delay <= 0) {
2636                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2637                                 commit++;
2638                                 continue;
2639                         }
2640
2641                         slave->delay--;
2642                         break;
2643
2644                 case BOND_LINK_DOWN:
2645                         if (!link_state)
2646                                 continue;
2647
2648                         bond_propose_link_state(slave, BOND_LINK_BACK);
2649                         commit++;
2650                         slave->delay = bond->params.updelay;
2651
2652                         if (slave->delay) {
2653                                 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2654                                            ignore_updelay ? 0 :
2655                                            bond->params.updelay *
2656                                            bond->params.miimon);
2657                         }
2658                         fallthrough;
2659                 case BOND_LINK_BACK:
2660                         if (!link_state) {
2661                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2662                                 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2663                                            (bond->params.updelay - slave->delay) *
2664                                            bond->params.miimon);
2665                                 commit++;
2666                                 continue;
2667                         }
2668
2669                         if (ignore_updelay)
2670                                 slave->delay = 0;
2671
2672                         if (slave->delay <= 0) {
2673                                 bond_propose_link_state(slave, BOND_LINK_UP);
2674                                 commit++;
2675                                 ignore_updelay = false;
2676                                 continue;
2677                         }
2678
2679                         slave->delay--;
2680                         break;
2681                 }
2682         }
2683
2684         return commit;
2685 }
2686
2687 static void bond_miimon_link_change(struct bonding *bond,
2688                                     struct slave *slave,
2689                                     char link)
2690 {
2691         switch (BOND_MODE(bond)) {
2692         case BOND_MODE_8023AD:
2693                 bond_3ad_handle_link_change(slave, link);
2694                 break;
2695         case BOND_MODE_TLB:
2696         case BOND_MODE_ALB:
2697                 bond_alb_handle_link_change(bond, slave, link);
2698                 break;
2699         case BOND_MODE_XOR:
2700                 bond_update_slave_arr(bond, NULL);
2701                 break;
2702         }
2703 }
2704
2705 static void bond_miimon_commit(struct bonding *bond)
2706 {
2707         struct slave *slave, *primary, *active;
2708         bool do_failover = false;
2709         struct list_head *iter;
2710
2711         ASSERT_RTNL();
2712
2713         bond_for_each_slave(bond, slave, iter) {
2714                 switch (slave->link_new_state) {
2715                 case BOND_LINK_NOCHANGE:
2716                         /* For 802.3ad mode, check current slave speed and
2717                          * duplex again in case its port was disabled after
2718                          * invalid speed/duplex reporting but recovered before
2719                          * link monitoring could make a decision on the actual
2720                          * link status
2721                          */
2722                         if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2723                             slave->link == BOND_LINK_UP)
2724                                 bond_3ad_adapter_speed_duplex_changed(slave);
2725                         continue;
2726
2727                 case BOND_LINK_UP:
2728                         if (bond_update_speed_duplex(slave) &&
2729                             bond_needs_speed_duplex(bond)) {
2730                                 slave->link = BOND_LINK_DOWN;
2731                                 if (net_ratelimit())
2732                                         slave_warn(bond->dev, slave->dev,
2733                                                    "failed to get link speed/duplex\n");
2734                                 continue;
2735                         }
2736                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2737                                                   BOND_SLAVE_NOTIFY_NOW);
2738                         slave->last_link_up = jiffies;
2739
2740                         primary = rtnl_dereference(bond->primary_slave);
2741                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2742                                 /* prevent it from being the active one */
2743                                 bond_set_backup_slave(slave);
2744                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2745                                 /* make it immediately active */
2746                                 bond_set_active_slave(slave);
2747                         }
2748
2749                         slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2750                                    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2751                                    slave->duplex ? "full" : "half");
2752
2753                         bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2754
2755                         active = rtnl_dereference(bond->curr_active_slave);
2756                         if (!active || slave == primary || slave->prio > active->prio)
2757                                 do_failover = true;
2758
2759                         continue;
2760
2761                 case BOND_LINK_DOWN:
2762                         if (slave->link_failure_count < UINT_MAX)
2763                                 slave->link_failure_count++;
2764
2765                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2766                                                   BOND_SLAVE_NOTIFY_NOW);
2767
2768                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2769                             BOND_MODE(bond) == BOND_MODE_8023AD)
2770                                 bond_set_slave_inactive_flags(slave,
2771                                                               BOND_SLAVE_NOTIFY_NOW);
2772
2773                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2774
2775                         bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2776
2777                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2778                                 do_failover = true;
2779
2780                         continue;
2781
2782                 default:
2783                         slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2784                                   slave->link_new_state);
2785                         bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2786
2787                         continue;
2788                 }
2789         }
2790
2791         if (do_failover) {
2792                 block_netpoll_tx();
2793                 bond_select_active_slave(bond);
2794                 unblock_netpoll_tx();
2795         }
2796
2797         bond_set_carrier(bond);
2798 }
2799
2800 /* bond_mii_monitor
2801  *
2802  * Really a wrapper that splits the mii monitor into two phases: an
2803  * inspection, then (if inspection indicates something needs to be done)
2804  * an acquisition of appropriate locks followed by a commit phase to
2805  * implement whatever link state changes are indicated.
2806  */
2807 static void bond_mii_monitor(struct work_struct *work)
2808 {
2809         struct bonding *bond = container_of(work, struct bonding,
2810                                             mii_work.work);
2811         bool should_notify_peers = false;
2812         bool commit;
2813         unsigned long delay;
2814         struct slave *slave;
2815         struct list_head *iter;
2816
2817         delay = msecs_to_jiffies(bond->params.miimon);
2818
2819         if (!bond_has_slaves(bond))
2820                 goto re_arm;
2821
2822         rcu_read_lock();
2823         should_notify_peers = bond_should_notify_peers(bond);
2824         commit = !!bond_miimon_inspect(bond);
2825         if (bond->send_peer_notif) {
2826                 rcu_read_unlock();
2827                 if (rtnl_trylock()) {
2828                         bond->send_peer_notif--;
2829                         rtnl_unlock();
2830                 }
2831         } else {
2832                 rcu_read_unlock();
2833         }
2834
2835         if (commit) {
2836                 /* Race avoidance with bond_close cancel of workqueue */
2837                 if (!rtnl_trylock()) {
2838                         delay = 1;
2839                         should_notify_peers = false;
2840                         goto re_arm;
2841                 }
2842
2843                 bond_for_each_slave(bond, slave, iter) {
2844                         bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2845                 }
2846                 bond_miimon_commit(bond);
2847
2848                 rtnl_unlock();  /* might sleep, hold no other locks */
2849         }
2850
2851 re_arm:
2852         if (bond->params.miimon)
2853                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2854
2855         if (should_notify_peers) {
2856                 if (!rtnl_trylock())
2857                         return;
2858                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2859                 rtnl_unlock();
2860         }
2861 }
2862
2863 static int bond_upper_dev_walk(struct net_device *upper,
2864                                struct netdev_nested_priv *priv)
2865 {
2866         __be32 ip = *(__be32 *)priv->data;
2867
2868         return ip == bond_confirm_addr(upper, 0, ip);
2869 }
2870
2871 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2872 {
2873         struct netdev_nested_priv priv = {
2874                 .data = (void *)&ip,
2875         };
2876         bool ret = false;
2877
2878         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2879                 return true;
2880
2881         rcu_read_lock();
2882         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
2883                 ret = true;
2884         rcu_read_unlock();
2885
2886         return ret;
2887 }
2888
2889 #define BOND_VLAN_PROTO_NONE cpu_to_be16(0xffff)
2890
2891 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags,
2892                              struct sk_buff *skb)
2893 {
2894         struct net_device *bond_dev = slave->bond->dev;
2895         struct net_device *slave_dev = slave->dev;
2896         struct bond_vlan_tag *outer_tag = tags;
2897
2898         if (!tags || tags->vlan_proto == BOND_VLAN_PROTO_NONE)
2899                 return true;
2900
2901         tags++;
2902
2903         /* Go through all the tags backwards and add them to the packet */
2904         while (tags->vlan_proto != BOND_VLAN_PROTO_NONE) {
2905                 if (!tags->vlan_id) {
2906                         tags++;
2907                         continue;
2908                 }
2909
2910                 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2911                           ntohs(outer_tag->vlan_proto), tags->vlan_id);
2912                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2913                                                 tags->vlan_id);
2914                 if (!skb) {
2915                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2916                         return false;
2917                 }
2918
2919                 tags++;
2920         }
2921         /* Set the outer tag */
2922         if (outer_tag->vlan_id) {
2923                 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2924                           ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2925                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2926                                        outer_tag->vlan_id);
2927         }
2928
2929         return true;
2930 }
2931
2932 /* We go to the (large) trouble of VLAN tagging ARP frames because
2933  * switches in VLAN mode (especially if ports are configured as
2934  * "native" to a VLAN) might not pass non-tagged frames.
2935  */
2936 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2937                           __be32 src_ip, struct bond_vlan_tag *tags)
2938 {
2939         struct net_device *bond_dev = slave->bond->dev;
2940         struct net_device *slave_dev = slave->dev;
2941         struct sk_buff *skb;
2942
2943         slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2944                   arp_op, &dest_ip, &src_ip);
2945
2946         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2947                          NULL, slave_dev->dev_addr, NULL);
2948
2949         if (!skb) {
2950                 net_err_ratelimited("ARP packet allocation failed\n");
2951                 return;
2952         }
2953
2954         if (bond_handle_vlan(slave, tags, skb)) {
2955                 slave_update_last_tx(slave);
2956                 arp_xmit(skb);
2957         }
2958
2959         return;
2960 }
2961
2962 /* Validate the device path between the @start_dev and the @end_dev.
2963  * The path is valid if the @end_dev is reachable through device
2964  * stacking.
2965  * When the path is validated, collect any vlan information in the
2966  * path.
2967  */
2968 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2969                                               struct net_device *end_dev,
2970                                               int level)
2971 {
2972         struct bond_vlan_tag *tags;
2973         struct net_device *upper;
2974         struct list_head  *iter;
2975
2976         if (start_dev == end_dev) {
2977                 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2978                 if (!tags)
2979                         return ERR_PTR(-ENOMEM);
2980                 tags[level].vlan_proto = BOND_VLAN_PROTO_NONE;
2981                 return tags;
2982         }
2983
2984         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2985                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2986                 if (IS_ERR_OR_NULL(tags)) {
2987                         if (IS_ERR(tags))
2988                                 return tags;
2989                         continue;
2990                 }
2991                 if (is_vlan_dev(upper)) {
2992                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2993                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2994                 }
2995
2996                 return tags;
2997         }
2998
2999         return NULL;
3000 }
3001
3002 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
3003 {
3004         struct rtable *rt;
3005         struct bond_vlan_tag *tags;
3006         __be32 *targets = bond->params.arp_targets, addr;
3007         int i;
3008
3009         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
3010                 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
3011                           __func__, &targets[i]);
3012                 tags = NULL;
3013
3014                 /* Find out through which dev should the packet go */
3015                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
3016                                      RTO_ONLINK, 0);
3017                 if (IS_ERR(rt)) {
3018                         /* there's no route to target - try to send arp
3019                          * probe to generate any traffic (arp_validate=0)
3020                          */
3021                         if (bond->params.arp_validate)
3022                                 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
3023                                              bond->dev->name,
3024                                              &targets[i]);
3025                         bond_arp_send(slave, ARPOP_REQUEST, targets[i],
3026                                       0, tags);
3027                         continue;
3028                 }
3029
3030                 /* bond device itself */
3031                 if (rt->dst.dev == bond->dev)
3032                         goto found;
3033
3034                 rcu_read_lock();
3035                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
3036                 rcu_read_unlock();
3037
3038                 if (!IS_ERR_OR_NULL(tags))
3039                         goto found;
3040
3041                 /* Not our device - skip */
3042                 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
3043                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
3044
3045                 ip_rt_put(rt);
3046                 continue;
3047
3048 found:
3049                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
3050                 ip_rt_put(rt);
3051                 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
3052                 kfree(tags);
3053         }
3054 }
3055
3056 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
3057 {
3058         int i;
3059
3060         if (!sip || !bond_has_this_ip(bond, tip)) {
3061                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
3062                            __func__, &sip, &tip);
3063                 return;
3064         }
3065
3066         i = bond_get_targets_ip(bond->params.arp_targets, sip);
3067         if (i == -1) {
3068                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
3069                            __func__, &sip);
3070                 return;
3071         }
3072         slave->last_rx = jiffies;
3073         slave->target_last_arp_rx[i] = jiffies;
3074 }
3075
3076 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
3077                         struct slave *slave)
3078 {
3079         struct arphdr *arp = (struct arphdr *)skb->data;
3080         struct slave *curr_active_slave, *curr_arp_slave;
3081         unsigned char *arp_ptr;
3082         __be32 sip, tip;
3083         unsigned int alen;
3084
3085         alen = arp_hdr_len(bond->dev);
3086
3087         if (alen > skb_headlen(skb)) {
3088                 arp = kmalloc(alen, GFP_ATOMIC);
3089                 if (!arp)
3090                         goto out_unlock;
3091                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
3092                         goto out_unlock;
3093         }
3094
3095         if (arp->ar_hln != bond->dev->addr_len ||
3096             skb->pkt_type == PACKET_OTHERHOST ||
3097             skb->pkt_type == PACKET_LOOPBACK ||
3098             arp->ar_hrd != htons(ARPHRD_ETHER) ||
3099             arp->ar_pro != htons(ETH_P_IP) ||
3100             arp->ar_pln != 4)
3101                 goto out_unlock;
3102
3103         arp_ptr = (unsigned char *)(arp + 1);
3104         arp_ptr += bond->dev->addr_len;
3105         memcpy(&sip, arp_ptr, 4);
3106         arp_ptr += 4 + bond->dev->addr_len;
3107         memcpy(&tip, arp_ptr, 4);
3108
3109         slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
3110                   __func__, slave->dev->name, bond_slave_state(slave),
3111                   bond->params.arp_validate, slave_do_arp_validate(bond, slave),
3112                   &sip, &tip);
3113
3114         curr_active_slave = rcu_dereference(bond->curr_active_slave);
3115         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
3116
3117         /* We 'trust' the received ARP enough to validate it if:
3118          *
3119          * (a) the slave receiving the ARP is active (which includes the
3120          * current ARP slave, if any), or
3121          *
3122          * (b) the receiving slave isn't active, but there is a currently
3123          * active slave and it received valid arp reply(s) after it became
3124          * the currently active slave, or
3125          *
3126          * (c) there is an ARP slave that sent an ARP during the prior ARP
3127          * interval, and we receive an ARP reply on any slave.  We accept
3128          * these because switch FDB update delays may deliver the ARP
3129          * reply to a slave other than the sender of the ARP request.
3130          *
3131          * Note: for (b), backup slaves are receiving the broadcast ARP
3132          * request, not a reply.  This request passes from the sending
3133          * slave through the L2 switch(es) to the receiving slave.  Since
3134          * this is checking the request, sip/tip are swapped for
3135          * validation.
3136          *
3137          * This is done to avoid endless looping when we can't reach the
3138          * arp_ip_target and fool ourselves with our own arp requests.
3139          */
3140         if (bond_is_active_slave(slave))
3141                 bond_validate_arp(bond, slave, sip, tip);
3142         else if (curr_active_slave &&
3143                  time_after(slave_last_rx(bond, curr_active_slave),
3144                             curr_active_slave->last_link_up))
3145                 bond_validate_arp(bond, slave, tip, sip);
3146         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
3147                  bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))
3148                 bond_validate_arp(bond, slave, sip, tip);
3149
3150 out_unlock:
3151         if (arp != (struct arphdr *)skb->data)
3152                 kfree(arp);
3153         return RX_HANDLER_ANOTHER;
3154 }
3155
3156 #if IS_ENABLED(CONFIG_IPV6)
3157 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr,
3158                          const struct in6_addr *saddr, struct bond_vlan_tag *tags)
3159 {
3160         struct net_device *bond_dev = slave->bond->dev;
3161         struct net_device *slave_dev = slave->dev;
3162         struct in6_addr mcaddr;
3163         struct sk_buff *skb;
3164
3165         slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n",
3166                   daddr, saddr);
3167
3168         skb = ndisc_ns_create(slave_dev, daddr, saddr, 0);
3169         if (!skb) {
3170                 net_err_ratelimited("NS packet allocation failed\n");
3171                 return;
3172         }
3173
3174         addrconf_addr_solict_mult(daddr, &mcaddr);
3175         if (bond_handle_vlan(slave, tags, skb)) {
3176                 slave_update_last_tx(slave);
3177                 ndisc_send_skb(skb, &mcaddr, saddr);
3178         }
3179 }
3180
3181 static void bond_ns_send_all(struct bonding *bond, struct slave *slave)
3182 {
3183         struct in6_addr *targets = bond->params.ns_targets;
3184         struct bond_vlan_tag *tags;
3185         struct dst_entry *dst;
3186         struct in6_addr saddr;
3187         struct flowi6 fl6;
3188         int i;
3189
3190         for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) {
3191                 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n",
3192                           __func__, &targets[i]);
3193                 tags = NULL;
3194
3195                 /* Find out through which dev should the packet go */
3196                 memset(&fl6, 0, sizeof(struct flowi6));
3197                 fl6.daddr = targets[i];
3198                 fl6.flowi6_oif = bond->dev->ifindex;
3199
3200                 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6);
3201                 if (dst->error) {
3202                         dst_release(dst);
3203                         /* there's no route to target - try to send arp
3204                          * probe to generate any traffic (arp_validate=0)
3205                          */
3206                         if (bond->params.arp_validate)
3207                                 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n",
3208                                              bond->dev->name,
3209                                              &targets[i]);
3210                         bond_ns_send(slave, &targets[i], &in6addr_any, tags);
3211                         continue;
3212                 }
3213
3214                 /* bond device itself */
3215                 if (dst->dev == bond->dev)
3216                         goto found;
3217
3218                 rcu_read_lock();
3219                 tags = bond_verify_device_path(bond->dev, dst->dev, 0);
3220                 rcu_read_unlock();
3221
3222                 if (!IS_ERR_OR_NULL(tags))
3223                         goto found;
3224
3225                 /* Not our device - skip */
3226                 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n",
3227                           &targets[i], dst->dev ? dst->dev->name : "NULL");
3228
3229                 dst_release(dst);
3230                 continue;
3231
3232 found:
3233                 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr))
3234                         bond_ns_send(slave, &targets[i], &saddr, tags);
3235                 else
3236                         bond_ns_send(slave, &targets[i], &in6addr_any, tags);
3237
3238                 dst_release(dst);
3239                 kfree(tags);
3240         }
3241 }
3242
3243 static int bond_confirm_addr6(struct net_device *dev,
3244                               struct netdev_nested_priv *priv)
3245 {
3246         struct in6_addr *addr = (struct in6_addr *)priv->data;
3247
3248         return ipv6_chk_addr(dev_net(dev), addr, dev, 0);
3249 }
3250
3251 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr)
3252 {
3253         struct netdev_nested_priv priv = {
3254                 .data = addr,
3255         };
3256         int ret = false;
3257
3258         if (bond_confirm_addr6(bond->dev, &priv))
3259                 return true;
3260
3261         rcu_read_lock();
3262         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv))
3263                 ret = true;
3264         rcu_read_unlock();
3265
3266         return ret;
3267 }
3268
3269 static void bond_validate_na(struct bonding *bond, struct slave *slave,
3270                              struct in6_addr *saddr, struct in6_addr *daddr)
3271 {
3272         int i;
3273
3274         /* Ignore NAs that:
3275          * 1. Source address is unspecified address.
3276          * 2. Dest address is neither all-nodes multicast address nor
3277          *    exist on bond interface.
3278          */
3279         if (ipv6_addr_any(saddr) ||
3280             (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) &&
3281              !bond_has_this_ip6(bond, daddr))) {
3282                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n",
3283                           __func__, saddr, daddr);
3284                 return;
3285         }
3286
3287         i = bond_get_targets_ip6(bond->params.ns_targets, saddr);
3288         if (i == -1) {
3289                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n",
3290                           __func__, saddr);
3291                 return;
3292         }
3293         slave->last_rx = jiffies;
3294         slave->target_last_arp_rx[i] = jiffies;
3295 }
3296
3297 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond,
3298                        struct slave *slave)
3299 {
3300         struct slave *curr_active_slave, *curr_arp_slave;
3301         struct in6_addr *saddr, *daddr;
3302         struct {
3303                 struct ipv6hdr ip6;
3304                 struct icmp6hdr icmp6;
3305         } *combined, _combined;
3306
3307         if (skb->pkt_type == PACKET_OTHERHOST ||
3308             skb->pkt_type == PACKET_LOOPBACK)
3309                 goto out;
3310
3311         combined = skb_header_pointer(skb, 0, sizeof(_combined), &_combined);
3312         if (!combined || combined->ip6.nexthdr != NEXTHDR_ICMP ||
3313             (combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION &&
3314              combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT))
3315                 goto out;
3316
3317         saddr = &combined->ip6.saddr;
3318         daddr = &combined->ip6.daddr;
3319
3320         slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n",
3321                   __func__, slave->dev->name, bond_slave_state(slave),
3322                   bond->params.arp_validate, slave_do_arp_validate(bond, slave),
3323                   saddr, daddr);
3324
3325         curr_active_slave = rcu_dereference(bond->curr_active_slave);
3326         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
3327
3328         /* We 'trust' the received ARP enough to validate it if:
3329          * see bond_arp_rcv().
3330          */
3331         if (bond_is_active_slave(slave))
3332                 bond_validate_na(bond, slave, saddr, daddr);
3333         else if (curr_active_slave &&
3334                  time_after(slave_last_rx(bond, curr_active_slave),
3335                             curr_active_slave->last_link_up))
3336                 bond_validate_na(bond, slave, daddr, saddr);
3337         else if (curr_arp_slave &&
3338                  bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))
3339                 bond_validate_na(bond, slave, saddr, daddr);
3340
3341 out:
3342         return RX_HANDLER_ANOTHER;
3343 }
3344 #endif
3345
3346 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond,
3347                       struct slave *slave)
3348 {
3349 #if IS_ENABLED(CONFIG_IPV6)
3350         bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6);
3351 #endif
3352         bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
3353
3354         slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
3355                   __func__, skb->dev->name);
3356
3357         /* Use arp validate logic for both ARP and NS */
3358         if (!slave_do_arp_validate(bond, slave)) {
3359                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
3360 #if IS_ENABLED(CONFIG_IPV6)
3361                     (slave_do_arp_validate_only(bond) && is_ipv6) ||
3362 #endif
3363                     !slave_do_arp_validate_only(bond))
3364                         slave->last_rx = jiffies;
3365                 return RX_HANDLER_ANOTHER;
3366         } else if (is_arp) {
3367                 return bond_arp_rcv(skb, bond, slave);
3368 #if IS_ENABLED(CONFIG_IPV6)
3369         } else if (is_ipv6) {
3370                 return bond_na_rcv(skb, bond, slave);
3371 #endif
3372         } else {
3373                 return RX_HANDLER_ANOTHER;
3374         }
3375 }
3376
3377 static void bond_send_validate(struct bonding *bond, struct slave *slave)
3378 {
3379         bond_arp_send_all(bond, slave);
3380 #if IS_ENABLED(CONFIG_IPV6)
3381         bond_ns_send_all(bond, slave);
3382 #endif
3383 }
3384
3385 /* function to verify if we're in the arp_interval timeslice, returns true if
3386  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
3387  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
3388  */
3389 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
3390                                   int mod)
3391 {
3392         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3393
3394         return time_in_range(jiffies,
3395                              last_act - delta_in_ticks,
3396                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
3397 }
3398
3399 /* This function is called regularly to monitor each slave's link
3400  * ensuring that traffic is being sent and received when arp monitoring
3401  * is used in load-balancing mode. if the adapter has been dormant, then an
3402  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
3403  * arp monitoring in active backup mode.
3404  */
3405 static void bond_loadbalance_arp_mon(struct bonding *bond)
3406 {
3407         struct slave *slave, *oldcurrent;
3408         struct list_head *iter;
3409         int do_failover = 0, slave_state_changed = 0;
3410
3411         if (!bond_has_slaves(bond))
3412                 goto re_arm;
3413
3414         rcu_read_lock();
3415
3416         oldcurrent = rcu_dereference(bond->curr_active_slave);
3417         /* see if any of the previous devices are up now (i.e. they have
3418          * xmt and rcv traffic). the curr_active_slave does not come into
3419          * the picture unless it is null. also, slave->last_link_up is not
3420          * needed here because we send an arp on each slave and give a slave
3421          * as long as it needs to get the tx/rx within the delta.
3422          * TODO: what about up/down delay in arp mode? it wasn't here before
3423          *       so it can wait
3424          */
3425         bond_for_each_slave_rcu(bond, slave, iter) {
3426                 unsigned long last_tx = slave_last_tx(slave);
3427
3428                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3429
3430                 if (slave->link != BOND_LINK_UP) {
3431                         if (bond_time_in_interval(bond, last_tx, 1) &&
3432                             bond_time_in_interval(bond, slave->last_rx, 1)) {
3433
3434                                 bond_propose_link_state(slave, BOND_LINK_UP);
3435                                 slave_state_changed = 1;
3436
3437                                 /* primary_slave has no meaning in round-robin
3438                                  * mode. the window of a slave being up and
3439                                  * curr_active_slave being null after enslaving
3440                                  * is closed.
3441                                  */
3442                                 if (!oldcurrent) {
3443                                         slave_info(bond->dev, slave->dev, "link status definitely up\n");
3444                                         do_failover = 1;
3445                                 } else {
3446                                         slave_info(bond->dev, slave->dev, "interface is now up\n");
3447                                 }
3448                         }
3449                 } else {
3450                         /* slave->link == BOND_LINK_UP */
3451
3452                         /* not all switches will respond to an arp request
3453                          * when the source ip is 0, so don't take the link down
3454                          * if we don't know our ip yet
3455                          */
3456                         if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||
3457                             !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) {
3458
3459                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
3460                                 slave_state_changed = 1;
3461
3462                                 if (slave->link_failure_count < UINT_MAX)
3463                                         slave->link_failure_count++;
3464
3465                                 slave_info(bond->dev, slave->dev, "interface is now down\n");
3466
3467                                 if (slave == oldcurrent)
3468                                         do_failover = 1;
3469                         }
3470                 }
3471
3472                 /* note: if switch is in round-robin mode, all links
3473                  * must tx arp to ensure all links rx an arp - otherwise
3474                  * links may oscillate or not come up at all; if switch is
3475                  * in something like xor mode, there is nothing we can
3476                  * do - all replies will be rx'ed on same link causing slaves
3477                  * to be unstable during low/no traffic periods
3478                  */
3479                 if (bond_slave_is_up(slave))
3480                         bond_send_validate(bond, slave);
3481         }
3482
3483         rcu_read_unlock();
3484
3485         if (do_failover || slave_state_changed) {
3486                 if (!rtnl_trylock())
3487                         goto re_arm;
3488
3489                 bond_for_each_slave(bond, slave, iter) {
3490                         if (slave->link_new_state != BOND_LINK_NOCHANGE)
3491                                 slave->link = slave->link_new_state;
3492                 }
3493
3494                 if (slave_state_changed) {
3495                         bond_slave_state_change(bond);
3496                         if (BOND_MODE(bond) == BOND_MODE_XOR)
3497                                 bond_update_slave_arr(bond, NULL);
3498                 }
3499                 if (do_failover) {
3500                         block_netpoll_tx();
3501                         bond_select_active_slave(bond);
3502                         unblock_netpoll_tx();
3503                 }
3504                 rtnl_unlock();
3505         }
3506
3507 re_arm:
3508         if (bond->params.arp_interval)
3509                 queue_delayed_work(bond->wq, &bond->arp_work,
3510                                    msecs_to_jiffies(bond->params.arp_interval));
3511 }
3512
3513 /* Called to inspect slaves for active-backup mode ARP monitor link state
3514  * changes.  Sets proposed link state in slaves to specify what action
3515  * should take place for the slave.  Returns 0 if no changes are found, >0
3516  * if changes to link states must be committed.
3517  *
3518  * Called with rcu_read_lock held.
3519  */
3520 static int bond_ab_arp_inspect(struct bonding *bond)
3521 {
3522         unsigned long last_tx, last_rx;
3523         struct list_head *iter;
3524         struct slave *slave;
3525         int commit = 0;
3526
3527         bond_for_each_slave_rcu(bond, slave, iter) {
3528                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3529                 last_rx = slave_last_rx(bond, slave);
3530
3531                 if (slave->link != BOND_LINK_UP) {
3532                         if (bond_time_in_interval(bond, last_rx, 1)) {
3533                                 bond_propose_link_state(slave, BOND_LINK_UP);
3534                                 commit++;
3535                         } else if (slave->link == BOND_LINK_BACK) {
3536                                 bond_propose_link_state(slave, BOND_LINK_FAIL);
3537                                 commit++;
3538                         }
3539                         continue;
3540                 }
3541
3542                 /* Give slaves 2*delta after being enslaved or made
3543                  * active.  This avoids bouncing, as the last receive
3544                  * times need a full ARP monitor cycle to be updated.
3545                  */
3546                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
3547                         continue;
3548
3549                 /* Backup slave is down if:
3550                  * - No current_arp_slave AND
3551                  * - more than (missed_max+1)*delta since last receive AND
3552                  * - the bond has an IP address
3553                  *
3554                  * Note: a non-null current_arp_slave indicates
3555                  * the curr_active_slave went down and we are
3556                  * searching for a new one; under this condition
3557                  * we only take the curr_active_slave down - this
3558                  * gives each slave a chance to tx/rx traffic
3559                  * before being taken out
3560                  */
3561                 if (!bond_is_active_slave(slave) &&
3562                     !rcu_access_pointer(bond->current_arp_slave) &&
3563                     !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) {
3564                         bond_propose_link_state(slave, BOND_LINK_DOWN);
3565                         commit++;
3566                 }
3567
3568                 /* Active slave is down if:
3569                  * - more than missed_max*delta since transmitting OR
3570                  * - (more than missed_max*delta since receive AND
3571                  *    the bond has an IP address)
3572                  */
3573                 last_tx = slave_last_tx(slave);
3574                 if (bond_is_active_slave(slave) &&
3575                     (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||
3576                      !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) {
3577                         bond_propose_link_state(slave, BOND_LINK_DOWN);
3578                         commit++;
3579                 }
3580         }
3581
3582         return commit;
3583 }
3584
3585 /* Called to commit link state changes noted by inspection step of
3586  * active-backup mode ARP monitor.
3587  *
3588  * Called with RTNL hold.
3589  */
3590 static void bond_ab_arp_commit(struct bonding *bond)
3591 {
3592         bool do_failover = false;
3593         struct list_head *iter;
3594         unsigned long last_tx;
3595         struct slave *slave;
3596
3597         bond_for_each_slave(bond, slave, iter) {
3598                 switch (slave->link_new_state) {
3599                 case BOND_LINK_NOCHANGE:
3600                         continue;
3601
3602                 case BOND_LINK_UP:
3603                         last_tx = slave_last_tx(slave);
3604                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
3605                             (!rtnl_dereference(bond->curr_active_slave) &&
3606                              bond_time_in_interval(bond, last_tx, 1))) {
3607                                 struct slave *current_arp_slave;
3608
3609                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3610                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
3611                                                           BOND_SLAVE_NOTIFY_NOW);
3612                                 if (current_arp_slave) {
3613                                         bond_set_slave_inactive_flags(
3614                                                 current_arp_slave,
3615                                                 BOND_SLAVE_NOTIFY_NOW);
3616                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3617                                 }
3618
3619                                 slave_info(bond->dev, slave->dev, "link status definitely up\n");
3620
3621                                 if (!rtnl_dereference(bond->curr_active_slave) ||
3622                                     slave == rtnl_dereference(bond->primary_slave) ||
3623                                     slave->prio > rtnl_dereference(bond->curr_active_slave)->prio)
3624                                         do_failover = true;
3625
3626                         }
3627
3628                         continue;
3629
3630                 case BOND_LINK_DOWN:
3631                         if (slave->link_failure_count < UINT_MAX)
3632                                 slave->link_failure_count++;
3633
3634                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3635                                                   BOND_SLAVE_NOTIFY_NOW);
3636                         bond_set_slave_inactive_flags(slave,
3637                                                       BOND_SLAVE_NOTIFY_NOW);
3638
3639                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3640
3641                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
3642                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3643                                 do_failover = true;
3644                         }
3645
3646                         continue;
3647
3648                 case BOND_LINK_FAIL:
3649                         bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3650                                                   BOND_SLAVE_NOTIFY_NOW);
3651                         bond_set_slave_inactive_flags(slave,
3652                                                       BOND_SLAVE_NOTIFY_NOW);
3653
3654                         /* A slave has just been enslaved and has become
3655                          * the current active slave.
3656                          */
3657                         if (rtnl_dereference(bond->curr_active_slave))
3658                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3659                         continue;
3660
3661                 default:
3662                         slave_err(bond->dev, slave->dev,
3663                                   "impossible: link_new_state %d on slave\n",
3664                                   slave->link_new_state);
3665                         continue;
3666                 }
3667         }
3668
3669         if (do_failover) {
3670                 block_netpoll_tx();
3671                 bond_select_active_slave(bond);
3672                 unblock_netpoll_tx();
3673         }
3674
3675         bond_set_carrier(bond);
3676 }
3677
3678 /* Send ARP probes for active-backup mode ARP monitor.
3679  *
3680  * Called with rcu_read_lock held.
3681  */
3682 static bool bond_ab_arp_probe(struct bonding *bond)
3683 {
3684         struct slave *slave, *before = NULL, *new_slave = NULL,
3685                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3686                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3687         struct list_head *iter;
3688         bool found = false;
3689         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3690
3691         if (curr_arp_slave && curr_active_slave)
3692                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3693                             curr_arp_slave->dev->name,
3694                             curr_active_slave->dev->name);
3695
3696         if (curr_active_slave) {
3697                 bond_send_validate(bond, curr_active_slave);
3698                 return should_notify_rtnl;
3699         }
3700
3701         /* if we don't have a curr_active_slave, search for the next available
3702          * backup slave from the current_arp_slave and make it the candidate
3703          * for becoming the curr_active_slave
3704          */
3705
3706         if (!curr_arp_slave) {
3707                 curr_arp_slave = bond_first_slave_rcu(bond);
3708                 if (!curr_arp_slave)
3709                         return should_notify_rtnl;
3710         }
3711
3712         bond_for_each_slave_rcu(bond, slave, iter) {
3713                 if (!found && !before && bond_slave_is_up(slave))
3714                         before = slave;
3715
3716                 if (found && !new_slave && bond_slave_is_up(slave))
3717                         new_slave = slave;
3718                 /* if the link state is up at this point, we
3719                  * mark it down - this can happen if we have
3720                  * simultaneous link failures and
3721                  * reselect_active_interface doesn't make this
3722                  * one the current slave so it is still marked
3723                  * up when it is actually down
3724                  */
3725                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3726                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3727                                                   BOND_SLAVE_NOTIFY_LATER);
3728                         if (slave->link_failure_count < UINT_MAX)
3729                                 slave->link_failure_count++;
3730
3731                         bond_set_slave_inactive_flags(slave,
3732                                                       BOND_SLAVE_NOTIFY_LATER);
3733
3734                         slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3735                 }
3736                 if (slave == curr_arp_slave)
3737                         found = true;
3738         }
3739
3740         if (!new_slave && before)
3741                 new_slave = before;
3742
3743         if (!new_slave)
3744                 goto check_state;
3745
3746         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3747                                   BOND_SLAVE_NOTIFY_LATER);
3748         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3749         bond_send_validate(bond, new_slave);
3750         new_slave->last_link_up = jiffies;
3751         rcu_assign_pointer(bond->current_arp_slave, new_slave);
3752
3753 check_state:
3754         bond_for_each_slave_rcu(bond, slave, iter) {
3755                 if (slave->should_notify || slave->should_notify_link) {
3756                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3757                         break;
3758                 }
3759         }
3760         return should_notify_rtnl;
3761 }
3762
3763 static void bond_activebackup_arp_mon(struct bonding *bond)
3764 {
3765         bool should_notify_peers = false;
3766         bool should_notify_rtnl = false;
3767         int delta_in_ticks;
3768
3769         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3770
3771         if (!bond_has_slaves(bond))
3772                 goto re_arm;
3773
3774         rcu_read_lock();
3775
3776         should_notify_peers = bond_should_notify_peers(bond);
3777
3778         if (bond_ab_arp_inspect(bond)) {
3779                 rcu_read_unlock();
3780
3781                 /* Race avoidance with bond_close flush of workqueue */
3782                 if (!rtnl_trylock()) {
3783                         delta_in_ticks = 1;
3784                         should_notify_peers = false;
3785                         goto re_arm;
3786                 }
3787
3788                 bond_ab_arp_commit(bond);
3789
3790                 rtnl_unlock();
3791                 rcu_read_lock();
3792         }
3793
3794         should_notify_rtnl = bond_ab_arp_probe(bond);
3795         rcu_read_unlock();
3796
3797 re_arm:
3798         if (bond->params.arp_interval)
3799                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3800
3801         if (should_notify_peers || should_notify_rtnl) {
3802                 if (!rtnl_trylock())
3803                         return;
3804
3805                 if (should_notify_peers) {
3806                         bond->send_peer_notif--;
3807                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3808                                                  bond->dev);
3809                 }
3810                 if (should_notify_rtnl) {
3811                         bond_slave_state_notify(bond);
3812                         bond_slave_link_notify(bond);
3813                 }
3814
3815                 rtnl_unlock();
3816         }
3817 }
3818
3819 static void bond_arp_monitor(struct work_struct *work)
3820 {
3821         struct bonding *bond = container_of(work, struct bonding,
3822                                             arp_work.work);
3823
3824         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3825                 bond_activebackup_arp_mon(bond);
3826         else
3827                 bond_loadbalance_arp_mon(bond);
3828 }
3829
3830 /*-------------------------- netdev event handling --------------------------*/
3831
3832 /* Change device name */
3833 static int bond_event_changename(struct bonding *bond)
3834 {
3835         bond_remove_proc_entry(bond);
3836         bond_create_proc_entry(bond);
3837
3838         bond_debug_reregister(bond);
3839
3840         return NOTIFY_DONE;
3841 }
3842
3843 static int bond_master_netdev_event(unsigned long event,
3844                                     struct net_device *bond_dev)
3845 {
3846         struct bonding *event_bond = netdev_priv(bond_dev);
3847
3848         netdev_dbg(bond_dev, "%s called\n", __func__);
3849
3850         switch (event) {
3851         case NETDEV_CHANGENAME:
3852                 return bond_event_changename(event_bond);
3853         case NETDEV_UNREGISTER:
3854                 bond_remove_proc_entry(event_bond);
3855 #ifdef CONFIG_XFRM_OFFLOAD
3856                 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true);
3857 #endif /* CONFIG_XFRM_OFFLOAD */
3858                 break;
3859         case NETDEV_REGISTER:
3860                 bond_create_proc_entry(event_bond);
3861                 break;
3862         default:
3863                 break;
3864         }
3865
3866         return NOTIFY_DONE;
3867 }
3868
3869 static int bond_slave_netdev_event(unsigned long event,
3870                                    struct net_device *slave_dev)
3871 {
3872         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3873         struct bonding *bond;
3874         struct net_device *bond_dev;
3875
3876         /* A netdev event can be generated while enslaving a device
3877          * before netdev_rx_handler_register is called in which case
3878          * slave will be NULL
3879          */
3880         if (!slave) {
3881                 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3882                 return NOTIFY_DONE;
3883         }
3884
3885         bond_dev = slave->bond->dev;
3886         bond = slave->bond;
3887         primary = rtnl_dereference(bond->primary_slave);
3888
3889         slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3890
3891         switch (event) {
3892         case NETDEV_UNREGISTER:
3893                 if (bond_dev->type != ARPHRD_ETHER)
3894                         bond_release_and_destroy(bond_dev, slave_dev);
3895                 else
3896                         __bond_release_one(bond_dev, slave_dev, false, true);
3897                 break;
3898         case NETDEV_UP:
3899         case NETDEV_CHANGE:
3900                 /* For 802.3ad mode only:
3901                  * Getting invalid Speed/Duplex values here will put slave
3902                  * in weird state. Mark it as link-fail if the link was
3903                  * previously up or link-down if it hasn't yet come up, and
3904                  * let link-monitoring (miimon) set it right when correct
3905                  * speeds/duplex are available.
3906                  */
3907                 if (bond_update_speed_duplex(slave) &&
3908                     BOND_MODE(bond) == BOND_MODE_8023AD) {
3909                         if (slave->last_link_up)
3910                                 slave->link = BOND_LINK_FAIL;
3911                         else
3912                                 slave->link = BOND_LINK_DOWN;
3913                 }
3914
3915                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3916                         bond_3ad_adapter_speed_duplex_changed(slave);
3917                 fallthrough;
3918         case NETDEV_DOWN:
3919                 /* Refresh slave-array if applicable!
3920                  * If the setup does not use miimon or arpmon (mode-specific!),
3921                  * then these events will not cause the slave-array to be
3922                  * refreshed. This will cause xmit to use a slave that is not
3923                  * usable. Avoid such situation by refeshing the array at these
3924                  * events. If these (miimon/arpmon) parameters are configured
3925                  * then array gets refreshed twice and that should be fine!
3926                  */
3927                 if (bond_mode_can_use_xmit_hash(bond))
3928                         bond_update_slave_arr(bond, NULL);
3929                 break;
3930         case NETDEV_CHANGEMTU:
3931                 /* TODO: Should slaves be allowed to
3932                  * independently alter their MTU?  For
3933                  * an active-backup bond, slaves need
3934                  * not be the same type of device, so
3935                  * MTUs may vary.  For other modes,
3936                  * slaves arguably should have the
3937                  * same MTUs. To do this, we'd need to
3938                  * take over the slave's change_mtu
3939                  * function for the duration of their
3940                  * servitude.
3941                  */
3942                 break;
3943         case NETDEV_CHANGENAME:
3944                 /* we don't care if we don't have primary set */
3945                 if (!bond_uses_primary(bond) ||
3946                     !bond->params.primary[0])
3947                         break;
3948
3949                 if (slave == primary) {
3950                         /* slave's name changed - he's no longer primary */
3951                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3952                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3953                         /* we have a new primary slave */
3954                         rcu_assign_pointer(bond->primary_slave, slave);
3955                 } else { /* we didn't change primary - exit */
3956                         break;
3957                 }
3958
3959                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3960                             primary ? slave_dev->name : "none");
3961
3962                 block_netpoll_tx();
3963                 bond_select_active_slave(bond);
3964                 unblock_netpoll_tx();
3965                 break;
3966         case NETDEV_FEAT_CHANGE:
3967                 if (!bond->notifier_ctx) {
3968                         bond->notifier_ctx = true;
3969                         bond_compute_features(bond);
3970                         bond->notifier_ctx = false;
3971                 }
3972                 break;
3973         case NETDEV_RESEND_IGMP:
3974                 /* Propagate to master device */
3975                 call_netdevice_notifiers(event, slave->bond->dev);
3976                 break;
3977         case NETDEV_XDP_FEAT_CHANGE:
3978                 bond_xdp_set_features(bond_dev);
3979                 break;
3980         default:
3981                 break;
3982         }
3983
3984         return NOTIFY_DONE;
3985 }
3986
3987 /* bond_netdev_event: handle netdev notifier chain events.
3988  *
3989  * This function receives events for the netdev chain.  The caller (an
3990  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3991  * locks for us to safely manipulate the slave devices (RTNL lock,
3992  * dev_probe_lock).
3993  */
3994 static int bond_netdev_event(struct notifier_block *this,
3995                              unsigned long event, void *ptr)
3996 {
3997         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3998
3999         netdev_dbg(event_dev, "%s received %s\n",
4000                    __func__, netdev_cmd_to_name(event));
4001
4002         if (!(event_dev->priv_flags & IFF_BONDING))
4003                 return NOTIFY_DONE;
4004
4005         if (event_dev->flags & IFF_MASTER) {
4006                 int ret;
4007
4008                 ret = bond_master_netdev_event(event, event_dev);
4009                 if (ret != NOTIFY_DONE)
4010                         return ret;
4011         }
4012
4013         if (event_dev->flags & IFF_SLAVE)
4014                 return bond_slave_netdev_event(event, event_dev);
4015
4016         return NOTIFY_DONE;
4017 }
4018
4019 static struct notifier_block bond_netdev_notifier = {
4020         .notifier_call = bond_netdev_event,
4021 };
4022
4023 /*---------------------------- Hashing Policies -----------------------------*/
4024
4025 /* Helper to access data in a packet, with or without a backing skb.
4026  * If skb is given the data is linearized if necessary via pskb_may_pull.
4027  */
4028 static inline const void *bond_pull_data(struct sk_buff *skb,
4029                                          const void *data, int hlen, int n)
4030 {
4031         if (likely(n <= hlen))
4032                 return data;
4033         else if (skb && likely(pskb_may_pull(skb, n)))
4034                 return skb->data;
4035
4036         return NULL;
4037 }
4038
4039 /* L2 hash helper */
4040 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)
4041 {
4042         struct ethhdr *ep;
4043
4044         data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));
4045         if (!data)
4046                 return 0;
4047
4048         ep = (struct ethhdr *)(data + mhoff);
4049         return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto);
4050 }
4051
4052 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data,
4053                          int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34)
4054 {
4055         const struct ipv6hdr *iph6;
4056         const struct iphdr *iph;
4057
4058         if (l2_proto == htons(ETH_P_IP)) {
4059                 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph));
4060                 if (!data)
4061                         return false;
4062
4063                 iph = (const struct iphdr *)(data + *nhoff);
4064                 iph_to_flow_copy_v4addrs(fk, iph);
4065                 *nhoff += iph->ihl << 2;
4066                 if (!ip_is_fragment(iph))
4067                         *ip_proto = iph->protocol;
4068         } else if (l2_proto == htons(ETH_P_IPV6)) {
4069                 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6));
4070                 if (!data)
4071                         return false;
4072
4073                 iph6 = (const struct ipv6hdr *)(data + *nhoff);
4074                 iph_to_flow_copy_v6addrs(fk, iph6);
4075                 *nhoff += sizeof(*iph6);
4076                 *ip_proto = iph6->nexthdr;
4077         } else {
4078                 return false;
4079         }
4080
4081         if (l34 && *ip_proto >= 0)
4082                 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen);
4083
4084         return true;
4085 }
4086
4087 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)
4088 {
4089         u32 srcmac_vendor = 0, srcmac_dev = 0;
4090         struct ethhdr *mac_hdr;
4091         u16 vlan = 0;
4092         int i;
4093
4094         data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));
4095         if (!data)
4096                 return 0;
4097         mac_hdr = (struct ethhdr *)(data + mhoff);
4098
4099         for (i = 0; i < 3; i++)
4100                 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i];
4101
4102         for (i = 3; i < ETH_ALEN; i++)
4103                 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i];
4104
4105         if (skb && skb_vlan_tag_present(skb))
4106                 vlan = skb_vlan_tag_get(skb);
4107
4108         return vlan ^ srcmac_vendor ^ srcmac_dev;
4109 }
4110
4111 /* Extract the appropriate headers based on bond's xmit policy */
4112 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data,
4113                               __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk)
4114 {
4115         bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
4116         int ip_proto = -1;
4117
4118         switch (bond->params.xmit_policy) {
4119         case BOND_XMIT_POLICY_ENCAP23:
4120         case BOND_XMIT_POLICY_ENCAP34:
4121                 memset(fk, 0, sizeof(*fk));
4122                 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
4123                                           fk, data, l2_proto, nhoff, hlen, 0);
4124         default:
4125                 break;
4126         }
4127
4128         fk->ports.ports = 0;
4129         memset(&fk->icmp, 0, sizeof(fk->icmp));
4130         if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34))
4131                 return false;
4132
4133         /* ICMP error packets contains at least 8 bytes of the header
4134          * of the packet which generated the error. Use this information
4135          * to correlate ICMP error packets within the same flow which
4136          * generated the error.
4137          */
4138         if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) {
4139                 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen);
4140                 if (ip_proto == IPPROTO_ICMP) {
4141                         if (!icmp_is_err(fk->icmp.type))
4142                                 return true;
4143
4144                         nhoff += sizeof(struct icmphdr);
4145                 } else if (ip_proto == IPPROTO_ICMPV6) {
4146                         if (!icmpv6_is_err(fk->icmp.type))
4147                                 return true;
4148
4149                         nhoff += sizeof(struct icmp6hdr);
4150                 }
4151                 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34);
4152         }
4153
4154         return true;
4155 }
4156
4157 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy)
4158 {
4159         hash ^= (__force u32)flow_get_u32_dst(flow) ^
4160                 (__force u32)flow_get_u32_src(flow);
4161         hash ^= (hash >> 16);
4162         hash ^= (hash >> 8);
4163
4164         /* discard lowest hash bit to deal with the common even ports pattern */
4165         if (xmit_policy == BOND_XMIT_POLICY_LAYER34 ||
4166                 xmit_policy == BOND_XMIT_POLICY_ENCAP34)
4167                 return hash >> 1;
4168
4169         return hash;
4170 }
4171
4172 /* Generate hash based on xmit policy. If @skb is given it is used to linearize
4173  * the data as required, but this function can be used without it if the data is
4174  * known to be linear (e.g. with xdp_buff).
4175  */
4176 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data,
4177                             __be16 l2_proto, int mhoff, int nhoff, int hlen)
4178 {
4179         struct flow_keys flow;
4180         u32 hash;
4181
4182         if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC)
4183                 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen);
4184
4185         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
4186             !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow))
4187                 return bond_eth_hash(skb, data, mhoff, hlen);
4188
4189         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
4190             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
4191                 hash = bond_eth_hash(skb, data, mhoff, hlen);
4192         } else {
4193                 if (flow.icmp.id)
4194                         memcpy(&hash, &flow.icmp, sizeof(hash));
4195                 else
4196                         memcpy(&hash, &flow.ports.ports, sizeof(hash));
4197         }
4198
4199         return bond_ip_hash(hash, &flow, bond->params.xmit_policy);
4200 }
4201
4202 /**
4203  * bond_xmit_hash - generate a hash value based on the xmit policy
4204  * @bond: bonding device
4205  * @skb: buffer to use for headers
4206  *
4207  * This function will extract the necessary headers from the skb buffer and use
4208  * them to generate a hash based on the xmit_policy set in the bonding device
4209  */
4210 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
4211 {
4212         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
4213             skb->l4_hash)
4214                 return skb->hash;
4215
4216         return __bond_xmit_hash(bond, skb, skb->data, skb->protocol,
4217                                 0, skb_network_offset(skb),
4218                                 skb_headlen(skb));
4219 }
4220
4221 /**
4222  * bond_xmit_hash_xdp - generate a hash value based on the xmit policy
4223  * @bond: bonding device
4224  * @xdp: buffer to use for headers
4225  *
4226  * The XDP variant of bond_xmit_hash.
4227  */
4228 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp)
4229 {
4230         struct ethhdr *eth;
4231
4232         if (xdp->data + sizeof(struct ethhdr) > xdp->data_end)
4233                 return 0;
4234
4235         eth = (struct ethhdr *)xdp->data;
4236
4237         return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0,
4238                                 sizeof(struct ethhdr), xdp->data_end - xdp->data);
4239 }
4240
4241 /*-------------------------- Device entry points ----------------------------*/
4242
4243 void bond_work_init_all(struct bonding *bond)
4244 {
4245         INIT_DELAYED_WORK(&bond->mcast_work,
4246                           bond_resend_igmp_join_requests_delayed);
4247         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
4248         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
4249         INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
4250         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
4251         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
4252 }
4253
4254 static void bond_work_cancel_all(struct bonding *bond)
4255 {
4256         cancel_delayed_work_sync(&bond->mii_work);
4257         cancel_delayed_work_sync(&bond->arp_work);
4258         cancel_delayed_work_sync(&bond->alb_work);
4259         cancel_delayed_work_sync(&bond->ad_work);
4260         cancel_delayed_work_sync(&bond->mcast_work);
4261         cancel_delayed_work_sync(&bond->slave_arr_work);
4262 }
4263
4264 static int bond_open(struct net_device *bond_dev)
4265 {
4266         struct bonding *bond = netdev_priv(bond_dev);
4267         struct list_head *iter;
4268         struct slave *slave;
4269
4270         if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) {
4271                 bond->rr_tx_counter = alloc_percpu(u32);
4272                 if (!bond->rr_tx_counter)
4273                         return -ENOMEM;
4274         }
4275
4276         /* reset slave->backup and slave->inactive */
4277         if (bond_has_slaves(bond)) {
4278                 bond_for_each_slave(bond, slave, iter) {
4279                         if (bond_uses_primary(bond) &&
4280                             slave != rcu_access_pointer(bond->curr_active_slave)) {
4281                                 bond_set_slave_inactive_flags(slave,
4282                                                               BOND_SLAVE_NOTIFY_NOW);
4283                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
4284                                 bond_set_slave_active_flags(slave,
4285                                                             BOND_SLAVE_NOTIFY_NOW);
4286                         }
4287                 }
4288         }
4289
4290         if (bond_is_lb(bond)) {
4291                 /* bond_alb_initialize must be called before the timer
4292                  * is started.
4293                  */
4294                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
4295                         return -ENOMEM;
4296                 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
4297                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
4298         }
4299
4300         if (bond->params.miimon)  /* link check interval, in milliseconds. */
4301                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
4302
4303         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
4304                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
4305                 bond->recv_probe = bond_rcv_validate;
4306         }
4307
4308         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4309                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
4310                 /* register to receive LACPDUs */
4311                 bond->recv_probe = bond_3ad_lacpdu_recv;
4312                 bond_3ad_initiate_agg_selection(bond, 1);
4313
4314                 bond_for_each_slave(bond, slave, iter)
4315                         dev_mc_add(slave->dev, lacpdu_mcast_addr);
4316         }
4317
4318         if (bond_mode_can_use_xmit_hash(bond))
4319                 bond_update_slave_arr(bond, NULL);
4320
4321         return 0;
4322 }
4323
4324 static int bond_close(struct net_device *bond_dev)
4325 {
4326         struct bonding *bond = netdev_priv(bond_dev);
4327         struct slave *slave;
4328
4329         bond_work_cancel_all(bond);
4330         bond->send_peer_notif = 0;
4331         if (bond_is_lb(bond))
4332                 bond_alb_deinitialize(bond);
4333         bond->recv_probe = NULL;
4334
4335         if (bond_uses_primary(bond)) {
4336                 rcu_read_lock();
4337                 slave = rcu_dereference(bond->curr_active_slave);
4338                 if (slave)
4339                         bond_hw_addr_flush(bond_dev, slave->dev);
4340                 rcu_read_unlock();
4341         } else {
4342                 struct list_head *iter;
4343
4344                 bond_for_each_slave(bond, slave, iter)
4345                         bond_hw_addr_flush(bond_dev, slave->dev);
4346         }
4347
4348         return 0;
4349 }
4350
4351 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
4352  * that some drivers can provide 32bit values only.
4353  */
4354 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
4355                             const struct rtnl_link_stats64 *_new,
4356                             const struct rtnl_link_stats64 *_old)
4357 {
4358         const u64 *new = (const u64 *)_new;
4359         const u64 *old = (const u64 *)_old;
4360         u64 *res = (u64 *)_res;
4361         int i;
4362
4363         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
4364                 u64 nv = new[i];
4365                 u64 ov = old[i];
4366                 s64 delta = nv - ov;
4367
4368                 /* detects if this particular field is 32bit only */
4369                 if (((nv | ov) >> 32) == 0)
4370                         delta = (s64)(s32)((u32)nv - (u32)ov);
4371
4372                 /* filter anomalies, some drivers reset their stats
4373                  * at down/up events.
4374                  */
4375                 if (delta > 0)
4376                         res[i] += delta;
4377         }
4378 }
4379
4380 #ifdef CONFIG_LOCKDEP
4381 static int bond_get_lowest_level_rcu(struct net_device *dev)
4382 {
4383         struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
4384         struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
4385         int cur = 0, max = 0;
4386
4387         now = dev;
4388         iter = &dev->adj_list.lower;
4389
4390         while (1) {
4391                 next = NULL;
4392                 while (1) {
4393                         ldev = netdev_next_lower_dev_rcu(now, &iter);
4394                         if (!ldev)
4395                                 break;
4396
4397                         next = ldev;
4398                         niter = &ldev->adj_list.lower;
4399                         dev_stack[cur] = now;
4400                         iter_stack[cur++] = iter;
4401                         if (max <= cur)
4402                                 max = cur;
4403                         break;
4404                 }
4405
4406                 if (!next) {
4407                         if (!cur)
4408                                 return max;
4409                         next = dev_stack[--cur];
4410                         niter = iter_stack[cur];
4411                 }
4412
4413                 now = next;
4414                 iter = niter;
4415         }
4416
4417         return max;
4418 }
4419 #endif
4420
4421 static void bond_get_stats(struct net_device *bond_dev,
4422                            struct rtnl_link_stats64 *stats)
4423 {
4424         struct bonding *bond = netdev_priv(bond_dev);
4425         struct rtnl_link_stats64 temp;
4426         struct list_head *iter;
4427         struct slave *slave;
4428         int nest_level = 0;
4429
4430
4431         rcu_read_lock();
4432 #ifdef CONFIG_LOCKDEP
4433         nest_level = bond_get_lowest_level_rcu(bond_dev);
4434 #endif
4435
4436         spin_lock_nested(&bond->stats_lock, nest_level);
4437         memcpy(stats, &bond->bond_stats, sizeof(*stats));
4438
4439         bond_for_each_slave_rcu(bond, slave, iter) {
4440                 const struct rtnl_link_stats64 *new =
4441                         dev_get_stats(slave->dev, &temp);
4442
4443                 bond_fold_stats(stats, new, &slave->slave_stats);
4444
4445                 /* save off the slave stats for the next run */
4446                 memcpy(&slave->slave_stats, new, sizeof(*new));
4447         }
4448
4449         memcpy(&bond->bond_stats, stats, sizeof(*stats));
4450         spin_unlock(&bond->stats_lock);
4451         rcu_read_unlock();
4452 }
4453
4454 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
4455 {
4456         struct bonding *bond = netdev_priv(bond_dev);
4457         struct mii_ioctl_data *mii = NULL;
4458
4459         netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd);
4460
4461         switch (cmd) {
4462         case SIOCGMIIPHY:
4463                 mii = if_mii(ifr);
4464                 if (!mii)
4465                         return -EINVAL;
4466
4467                 mii->phy_id = 0;
4468                 fallthrough;
4469         case SIOCGMIIREG:
4470                 /* We do this again just in case we were called by SIOCGMIIREG
4471                  * instead of SIOCGMIIPHY.
4472                  */
4473                 mii = if_mii(ifr);
4474                 if (!mii)
4475                         return -EINVAL;
4476
4477                 if (mii->reg_num == 1) {
4478                         mii->val_out = 0;
4479                         if (netif_carrier_ok(bond->dev))
4480                                 mii->val_out = BMSR_LSTATUS;
4481                 }
4482
4483                 break;
4484         default:
4485                 return -EOPNOTSUPP;
4486         }
4487
4488         return 0;
4489 }
4490
4491 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
4492 {
4493         struct bonding *bond = netdev_priv(bond_dev);
4494         struct net_device *slave_dev = NULL;
4495         struct ifbond k_binfo;
4496         struct ifbond __user *u_binfo = NULL;
4497         struct ifslave k_sinfo;
4498         struct ifslave __user *u_sinfo = NULL;
4499         struct bond_opt_value newval;
4500         struct net *net;
4501         int res = 0;
4502
4503         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
4504
4505         switch (cmd) {
4506         case SIOCBONDINFOQUERY:
4507                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
4508
4509                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
4510                         return -EFAULT;
4511
4512                 bond_info_query(bond_dev, &k_binfo);
4513                 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
4514                         return -EFAULT;
4515
4516                 return 0;
4517         case SIOCBONDSLAVEINFOQUERY:
4518                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
4519
4520                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
4521                         return -EFAULT;
4522
4523                 res = bond_slave_info_query(bond_dev, &k_sinfo);
4524                 if (res == 0 &&
4525                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
4526                         return -EFAULT;
4527
4528                 return res;
4529         default:
4530                 break;
4531         }
4532
4533         net = dev_net(bond_dev);
4534
4535         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4536                 return -EPERM;
4537
4538         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
4539
4540         slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
4541
4542         if (!slave_dev)
4543                 return -ENODEV;
4544
4545         switch (cmd) {
4546         case SIOCBONDENSLAVE:
4547                 res = bond_enslave(bond_dev, slave_dev, NULL);
4548                 break;
4549         case SIOCBONDRELEASE:
4550                 res = bond_release(bond_dev, slave_dev);
4551                 break;
4552         case SIOCBONDSETHWADDR:
4553                 res = bond_set_dev_addr(bond_dev, slave_dev);
4554                 break;
4555         case SIOCBONDCHANGEACTIVE:
4556                 bond_opt_initstr(&newval, slave_dev->name);
4557                 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
4558                                             &newval);
4559                 break;
4560         default:
4561                 res = -EOPNOTSUPP;
4562         }
4563
4564         return res;
4565 }
4566
4567 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr,
4568                                void __user *data, int cmd)
4569 {
4570         struct ifreq ifrdata = { .ifr_data = data };
4571
4572         switch (cmd) {
4573         case BOND_INFO_QUERY_OLD:
4574                 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY);
4575         case BOND_SLAVE_INFO_QUERY_OLD:
4576                 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY);
4577         case BOND_ENSLAVE_OLD:
4578                 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE);
4579         case BOND_RELEASE_OLD:
4580                 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE);
4581         case BOND_SETHWADDR_OLD:
4582                 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR);
4583         case BOND_CHANGE_ACTIVE_OLD:
4584                 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE);
4585         }
4586
4587         return -EOPNOTSUPP;
4588 }
4589
4590 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
4591 {
4592         struct bonding *bond = netdev_priv(bond_dev);
4593
4594         if (change & IFF_PROMISC)
4595                 bond_set_promiscuity(bond,
4596                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
4597
4598         if (change & IFF_ALLMULTI)
4599                 bond_set_allmulti(bond,
4600                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
4601 }
4602
4603 static void bond_set_rx_mode(struct net_device *bond_dev)
4604 {
4605         struct bonding *bond = netdev_priv(bond_dev);
4606         struct list_head *iter;
4607         struct slave *slave;
4608
4609         rcu_read_lock();
4610         if (bond_uses_primary(bond)) {
4611                 slave = rcu_dereference(bond->curr_active_slave);
4612                 if (slave) {
4613                         dev_uc_sync(slave->dev, bond_dev);
4614                         dev_mc_sync(slave->dev, bond_dev);
4615                 }
4616         } else {
4617                 bond_for_each_slave_rcu(bond, slave, iter) {
4618                         dev_uc_sync_multiple(slave->dev, bond_dev);
4619                         dev_mc_sync_multiple(slave->dev, bond_dev);
4620                 }
4621         }
4622         rcu_read_unlock();
4623 }
4624
4625 static int bond_neigh_init(struct neighbour *n)
4626 {
4627         struct bonding *bond = netdev_priv(n->dev);
4628         const struct net_device_ops *slave_ops;
4629         struct neigh_parms parms;
4630         struct slave *slave;
4631         int ret = 0;
4632
4633         rcu_read_lock();
4634         slave = bond_first_slave_rcu(bond);
4635         if (!slave)
4636                 goto out;
4637         slave_ops = slave->dev->netdev_ops;
4638         if (!slave_ops->ndo_neigh_setup)
4639                 goto out;
4640
4641         /* TODO: find another way [1] to implement this.
4642          * Passing a zeroed structure is fragile,
4643          * but at least we do not pass garbage.
4644          *
4645          * [1] One way would be that ndo_neigh_setup() never touch
4646          *     struct neigh_parms, but propagate the new neigh_setup()
4647          *     back to ___neigh_create() / neigh_parms_alloc()
4648          */
4649         memset(&parms, 0, sizeof(parms));
4650         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
4651
4652         if (ret)
4653                 goto out;
4654
4655         if (parms.neigh_setup)
4656                 ret = parms.neigh_setup(n);
4657 out:
4658         rcu_read_unlock();
4659         return ret;
4660 }
4661
4662 /* The bonding ndo_neigh_setup is called at init time beofre any
4663  * slave exists. So we must declare proxy setup function which will
4664  * be used at run time to resolve the actual slave neigh param setup.
4665  *
4666  * It's also called by master devices (such as vlans) to setup their
4667  * underlying devices. In that case - do nothing, we're already set up from
4668  * our init.
4669  */
4670 static int bond_neigh_setup(struct net_device *dev,
4671                             struct neigh_parms *parms)
4672 {
4673         /* modify only our neigh_parms */
4674         if (parms->dev == dev)
4675                 parms->neigh_setup = bond_neigh_init;
4676
4677         return 0;
4678 }
4679
4680 /* Change the MTU of all of a master's slaves to match the master */
4681 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4682 {
4683         struct bonding *bond = netdev_priv(bond_dev);
4684         struct slave *slave, *rollback_slave;
4685         struct list_head *iter;
4686         int res = 0;
4687
4688         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
4689
4690         bond_for_each_slave(bond, slave, iter) {
4691                 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
4692                            slave, slave->dev->netdev_ops->ndo_change_mtu);
4693
4694                 res = dev_set_mtu(slave->dev, new_mtu);
4695
4696                 if (res) {
4697                         /* If we failed to set the slave's mtu to the new value
4698                          * we must abort the operation even in ACTIVE_BACKUP
4699                          * mode, because if we allow the backup slaves to have
4700                          * different mtu values than the active slave we'll
4701                          * need to change their mtu when doing a failover. That
4702                          * means changing their mtu from timer context, which
4703                          * is probably not a good idea.
4704                          */
4705                         slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
4706                                   res, new_mtu);
4707                         goto unwind;
4708                 }
4709         }
4710
4711         bond_dev->mtu = new_mtu;
4712
4713         return 0;
4714
4715 unwind:
4716         /* unwind from head to the slave that failed */
4717         bond_for_each_slave(bond, rollback_slave, iter) {
4718                 int tmp_res;
4719
4720                 if (rollback_slave == slave)
4721                         break;
4722
4723                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
4724                 if (tmp_res)
4725                         slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
4726                                   tmp_res);
4727         }
4728
4729         return res;
4730 }
4731
4732 /* Change HW address
4733  *
4734  * Note that many devices must be down to change the HW address, and
4735  * downing the master releases all slaves.  We can make bonds full of
4736  * bonding devices to test this, however.
4737  */
4738 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4739 {
4740         struct bonding *bond = netdev_priv(bond_dev);
4741         struct slave *slave, *rollback_slave;
4742         struct sockaddr_storage *ss = addr, tmp_ss;
4743         struct list_head *iter;
4744         int res = 0;
4745
4746         if (BOND_MODE(bond) == BOND_MODE_ALB)
4747                 return bond_alb_set_mac_address(bond_dev, addr);
4748
4749
4750         netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4751
4752         /* If fail_over_mac is enabled, do nothing and return success.
4753          * Returning an error causes ifenslave to fail.
4754          */
4755         if (bond->params.fail_over_mac &&
4756             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4757                 return 0;
4758
4759         if (!is_valid_ether_addr(ss->__data))
4760                 return -EADDRNOTAVAIL;
4761
4762         bond_for_each_slave(bond, slave, iter) {
4763                 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4764                           __func__, slave);
4765                 res = dev_set_mac_address(slave->dev, addr, NULL);
4766                 if (res) {
4767                         /* TODO: consider downing the slave
4768                          * and retry ?
4769                          * User should expect communications
4770                          * breakage anyway until ARP finish
4771                          * updating, so...
4772                          */
4773                         slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4774                                   __func__, res);
4775                         goto unwind;
4776                 }
4777         }
4778
4779         /* success */
4780         dev_addr_set(bond_dev, ss->__data);
4781         return 0;
4782
4783 unwind:
4784         memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4785         tmp_ss.ss_family = bond_dev->type;
4786
4787         /* unwind from head to the slave that failed */
4788         bond_for_each_slave(bond, rollback_slave, iter) {
4789                 int tmp_res;
4790
4791                 if (rollback_slave == slave)
4792                         break;
4793
4794                 tmp_res = dev_set_mac_address(rollback_slave->dev,
4795                                               (struct sockaddr *)&tmp_ss, NULL);
4796                 if (tmp_res) {
4797                         slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4798                                    __func__, tmp_res);
4799                 }
4800         }
4801
4802         return res;
4803 }
4804
4805 /**
4806  * bond_get_slave_by_id - get xmit slave with slave_id
4807  * @bond: bonding device that is transmitting
4808  * @slave_id: slave id up to slave_cnt-1 through which to transmit
4809  *
4810  * This function tries to get slave with slave_id but in case
4811  * it fails, it tries to find the first available slave for transmission.
4812  */
4813 static struct slave *bond_get_slave_by_id(struct bonding *bond,
4814                                           int slave_id)
4815 {
4816         struct list_head *iter;
4817         struct slave *slave;
4818         int i = slave_id;
4819
4820         /* Here we start from the slave with slave_id */
4821         bond_for_each_slave_rcu(bond, slave, iter) {
4822                 if (--i < 0) {
4823                         if (bond_slave_can_tx(slave))
4824                                 return slave;
4825                 }
4826         }
4827
4828         /* Here we start from the first slave up to slave_id */
4829         i = slave_id;
4830         bond_for_each_slave_rcu(bond, slave, iter) {
4831                 if (--i < 0)
4832                         break;
4833                 if (bond_slave_can_tx(slave))
4834                         return slave;
4835         }
4836         /* no slave that can tx has been found */
4837         return NULL;
4838 }
4839
4840 /**
4841  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4842  * @bond: bonding device to use
4843  *
4844  * Based on the value of the bonding device's packets_per_slave parameter
4845  * this function generates a slave id, which is usually used as the next
4846  * slave to transmit through.
4847  */
4848 static u32 bond_rr_gen_slave_id(struct bonding *bond)
4849 {
4850         u32 slave_id;
4851         struct reciprocal_value reciprocal_packets_per_slave;
4852         int packets_per_slave = bond->params.packets_per_slave;
4853
4854         switch (packets_per_slave) {
4855         case 0:
4856                 slave_id = get_random_u32();
4857                 break;
4858         case 1:
4859                 slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
4860                 break;
4861         default:
4862                 reciprocal_packets_per_slave =
4863                         bond->params.reciprocal_packets_per_slave;
4864                 slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
4865                 slave_id = reciprocal_divide(slave_id,
4866                                              reciprocal_packets_per_slave);
4867                 break;
4868         }
4869
4870         return slave_id;
4871 }
4872
4873 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4874                                                     struct sk_buff *skb)
4875 {
4876         struct slave *slave;
4877         int slave_cnt;
4878         u32 slave_id;
4879
4880         /* Start with the curr_active_slave that joined the bond as the
4881          * default for sending IGMP traffic.  For failover purposes one
4882          * needs to maintain some consistency for the interface that will
4883          * send the join/membership reports.  The curr_active_slave found
4884          * will send all of this type of traffic.
4885          */
4886         if (skb->protocol == htons(ETH_P_IP)) {
4887                 int noff = skb_network_offset(skb);
4888                 struct iphdr *iph;
4889
4890                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4891                         goto non_igmp;
4892
4893                 iph = ip_hdr(skb);
4894                 if (iph->protocol == IPPROTO_IGMP) {
4895                         slave = rcu_dereference(bond->curr_active_slave);
4896                         if (slave)
4897                                 return slave;
4898                         return bond_get_slave_by_id(bond, 0);
4899                 }
4900         }
4901
4902 non_igmp:
4903         slave_cnt = READ_ONCE(bond->slave_cnt);
4904         if (likely(slave_cnt)) {
4905                 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4906                 return bond_get_slave_by_id(bond, slave_id);
4907         }
4908         return NULL;
4909 }
4910
4911 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond,
4912                                                         struct xdp_buff *xdp)
4913 {
4914         struct slave *slave;
4915         int slave_cnt;
4916         u32 slave_id;
4917         const struct ethhdr *eth;
4918         void *data = xdp->data;
4919
4920         if (data + sizeof(struct ethhdr) > xdp->data_end)
4921                 goto non_igmp;
4922
4923         eth = (struct ethhdr *)data;
4924         data += sizeof(struct ethhdr);
4925
4926         /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */
4927         if (eth->h_proto == htons(ETH_P_IP)) {
4928                 const struct iphdr *iph;
4929
4930                 if (data + sizeof(struct iphdr) > xdp->data_end)
4931                         goto non_igmp;
4932
4933                 iph = (struct iphdr *)data;
4934
4935                 if (iph->protocol == IPPROTO_IGMP) {
4936                         slave = rcu_dereference(bond->curr_active_slave);
4937                         if (slave)
4938                                 return slave;
4939                         return bond_get_slave_by_id(bond, 0);
4940                 }
4941         }
4942
4943 non_igmp:
4944         slave_cnt = READ_ONCE(bond->slave_cnt);
4945         if (likely(slave_cnt)) {
4946                 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4947                 return bond_get_slave_by_id(bond, slave_id);
4948         }
4949         return NULL;
4950 }
4951
4952 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4953                                         struct net_device *bond_dev)
4954 {
4955         struct bonding *bond = netdev_priv(bond_dev);
4956         struct slave *slave;
4957
4958         slave = bond_xmit_roundrobin_slave_get(bond, skb);
4959         if (likely(slave))
4960                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4961
4962         return bond_tx_drop(bond_dev, skb);
4963 }
4964
4965 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond)
4966 {
4967         return rcu_dereference(bond->curr_active_slave);
4968 }
4969
4970 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
4971  * the bond has a usable interface.
4972  */
4973 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4974                                           struct net_device *bond_dev)
4975 {
4976         struct bonding *bond = netdev_priv(bond_dev);
4977         struct slave *slave;
4978
4979         slave = bond_xmit_activebackup_slave_get(bond);
4980         if (slave)
4981                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4982
4983         return bond_tx_drop(bond_dev, skb);
4984 }
4985
4986 /* Use this to update slave_array when (a) it's not appropriate to update
4987  * slave_array right away (note that update_slave_array() may sleep)
4988  * and / or (b) RTNL is not held.
4989  */
4990 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4991 {
4992         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4993 }
4994
4995 /* Slave array work handler. Holds only RTNL */
4996 static void bond_slave_arr_handler(struct work_struct *work)
4997 {
4998         struct bonding *bond = container_of(work, struct bonding,
4999                                             slave_arr_work.work);
5000         int ret;
5001
5002         if (!rtnl_trylock())
5003                 goto err;
5004
5005         ret = bond_update_slave_arr(bond, NULL);
5006         rtnl_unlock();
5007         if (ret) {
5008                 pr_warn_ratelimited("Failed to update slave array from WT\n");
5009                 goto err;
5010         }
5011         return;
5012
5013 err:
5014         bond_slave_arr_work_rearm(bond, 1);
5015 }
5016
5017 static void bond_skip_slave(struct bond_up_slave *slaves,
5018                             struct slave *skipslave)
5019 {
5020         int idx;
5021
5022         /* Rare situation where caller has asked to skip a specific
5023          * slave but allocation failed (most likely!). BTW this is
5024          * only possible when the call is initiated from
5025          * __bond_release_one(). In this situation; overwrite the
5026          * skipslave entry in the array with the last entry from the
5027          * array to avoid a situation where the xmit path may choose
5028          * this to-be-skipped slave to send a packet out.
5029          */
5030         for (idx = 0; slaves && idx < slaves->count; idx++) {
5031                 if (skipslave == slaves->arr[idx]) {
5032                         slaves->arr[idx] =
5033                                 slaves->arr[slaves->count - 1];
5034                         slaves->count--;
5035                         break;
5036                 }
5037         }
5038 }
5039
5040 static void bond_set_slave_arr(struct bonding *bond,
5041                                struct bond_up_slave *usable_slaves,
5042                                struct bond_up_slave *all_slaves)
5043 {
5044         struct bond_up_slave *usable, *all;
5045
5046         usable = rtnl_dereference(bond->usable_slaves);
5047         rcu_assign_pointer(bond->usable_slaves, usable_slaves);
5048         kfree_rcu(usable, rcu);
5049
5050         all = rtnl_dereference(bond->all_slaves);
5051         rcu_assign_pointer(bond->all_slaves, all_slaves);
5052         kfree_rcu(all, rcu);
5053 }
5054
5055 static void bond_reset_slave_arr(struct bonding *bond)
5056 {
5057         bond_set_slave_arr(bond, NULL, NULL);
5058 }
5059
5060 /* Build the usable slaves array in control path for modes that use xmit-hash
5061  * to determine the slave interface -
5062  * (a) BOND_MODE_8023AD
5063  * (b) BOND_MODE_XOR
5064  * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
5065  *
5066  * The caller is expected to hold RTNL only and NO other lock!
5067  */
5068 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
5069 {
5070         struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
5071         struct slave *slave;
5072         struct list_head *iter;
5073         int agg_id = 0;
5074         int ret = 0;
5075
5076         might_sleep();
5077
5078         usable_slaves = kzalloc(struct_size(usable_slaves, arr,
5079                                             bond->slave_cnt), GFP_KERNEL);
5080         all_slaves = kzalloc(struct_size(all_slaves, arr,
5081                                          bond->slave_cnt), GFP_KERNEL);
5082         if (!usable_slaves || !all_slaves) {
5083                 ret = -ENOMEM;
5084                 goto out;
5085         }
5086         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
5087                 struct ad_info ad_info;
5088
5089                 spin_lock_bh(&bond->mode_lock);
5090                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
5091                         spin_unlock_bh(&bond->mode_lock);
5092                         pr_debug("bond_3ad_get_active_agg_info failed\n");
5093                         /* No active aggragator means it's not safe to use
5094                          * the previous array.
5095                          */
5096                         bond_reset_slave_arr(bond);
5097                         goto out;
5098                 }
5099                 spin_unlock_bh(&bond->mode_lock);
5100                 agg_id = ad_info.aggregator_id;
5101         }
5102         bond_for_each_slave(bond, slave, iter) {
5103                 if (skipslave == slave)
5104                         continue;
5105
5106                 all_slaves->arr[all_slaves->count++] = slave;
5107                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
5108                         struct aggregator *agg;
5109
5110                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
5111                         if (!agg || agg->aggregator_identifier != agg_id)
5112                                 continue;
5113                 }
5114                 if (!bond_slave_can_tx(slave))
5115                         continue;
5116
5117                 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
5118                           usable_slaves->count);
5119
5120                 usable_slaves->arr[usable_slaves->count++] = slave;
5121         }
5122
5123         bond_set_slave_arr(bond, usable_slaves, all_slaves);
5124         return ret;
5125 out:
5126         if (ret != 0 && skipslave) {
5127                 bond_skip_slave(rtnl_dereference(bond->all_slaves),
5128                                 skipslave);
5129                 bond_skip_slave(rtnl_dereference(bond->usable_slaves),
5130                                 skipslave);
5131         }
5132         kfree_rcu(all_slaves, rcu);
5133         kfree_rcu(usable_slaves, rcu);
5134
5135         return ret;
5136 }
5137
5138 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
5139                                                  struct sk_buff *skb,
5140                                                  struct bond_up_slave *slaves)
5141 {
5142         struct slave *slave;
5143         unsigned int count;
5144         u32 hash;
5145
5146         hash = bond_xmit_hash(bond, skb);
5147         count = slaves ? READ_ONCE(slaves->count) : 0;
5148         if (unlikely(!count))
5149                 return NULL;
5150
5151         slave = slaves->arr[hash % count];
5152         return slave;
5153 }
5154
5155 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond,
5156                                                      struct xdp_buff *xdp)
5157 {
5158         struct bond_up_slave *slaves;
5159         unsigned int count;
5160         u32 hash;
5161
5162         hash = bond_xmit_hash_xdp(bond, xdp);
5163         slaves = rcu_dereference(bond->usable_slaves);
5164         count = slaves ? READ_ONCE(slaves->count) : 0;
5165         if (unlikely(!count))
5166                 return NULL;
5167
5168         return slaves->arr[hash % count];
5169 }
5170
5171 /* Use this Xmit function for 3AD as well as XOR modes. The current
5172  * usable slave array is formed in the control path. The xmit function
5173  * just calculates hash and sends the packet out.
5174  */
5175 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
5176                                      struct net_device *dev)
5177 {
5178         struct bonding *bond = netdev_priv(dev);
5179         struct bond_up_slave *slaves;
5180         struct slave *slave;
5181
5182         slaves = rcu_dereference(bond->usable_slaves);
5183         slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
5184         if (likely(slave))
5185                 return bond_dev_queue_xmit(bond, skb, slave->dev);
5186
5187         return bond_tx_drop(dev, skb);
5188 }
5189
5190 /* in broadcast mode, we send everything to all usable interfaces. */
5191 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
5192                                        struct net_device *bond_dev)
5193 {
5194         struct bonding *bond = netdev_priv(bond_dev);
5195         struct slave *slave = NULL;
5196         struct list_head *iter;
5197         bool xmit_suc = false;
5198         bool skb_used = false;
5199
5200         bond_for_each_slave_rcu(bond, slave, iter) {
5201                 struct sk_buff *skb2;
5202
5203                 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP))
5204                         continue;
5205
5206                 if (bond_is_last_slave(bond, slave)) {
5207                         skb2 = skb;
5208                         skb_used = true;
5209                 } else {
5210                         skb2 = skb_clone(skb, GFP_ATOMIC);
5211                         if (!skb2) {
5212                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
5213                                                     bond_dev->name, __func__);
5214                                 continue;
5215                         }
5216                 }
5217
5218                 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK)
5219                         xmit_suc = true;
5220         }
5221
5222         if (!skb_used)
5223                 dev_kfree_skb_any(skb);
5224
5225         if (xmit_suc)
5226                 return NETDEV_TX_OK;
5227
5228         dev_core_stats_tx_dropped_inc(bond_dev);
5229         return NET_XMIT_DROP;
5230 }
5231
5232 /*------------------------- Device initialization ---------------------------*/
5233
5234 /* Lookup the slave that corresponds to a qid */
5235 static inline int bond_slave_override(struct bonding *bond,
5236                                       struct sk_buff *skb)
5237 {
5238         struct slave *slave = NULL;
5239         struct list_head *iter;
5240
5241         if (!skb_rx_queue_recorded(skb))
5242                 return 1;
5243
5244         /* Find out if any slaves have the same mapping as this skb. */
5245         bond_for_each_slave_rcu(bond, slave, iter) {
5246                 if (slave->queue_id == skb_get_queue_mapping(skb)) {
5247                         if (bond_slave_is_up(slave) &&
5248                             slave->link == BOND_LINK_UP) {
5249                                 bond_dev_queue_xmit(bond, skb, slave->dev);
5250                                 return 0;
5251                         }
5252                         /* If the slave isn't UP, use default transmit policy. */
5253                         break;
5254                 }
5255         }
5256
5257         return 1;
5258 }
5259
5260
5261 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
5262                              struct net_device *sb_dev)
5263 {
5264         /* This helper function exists to help dev_pick_tx get the correct
5265          * destination queue.  Using a helper function skips a call to
5266          * skb_tx_hash and will put the skbs in the queue we expect on their
5267          * way down to the bonding driver.
5268          */
5269         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
5270
5271         /* Save the original txq to restore before passing to the driver */
5272         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
5273
5274         if (unlikely(txq >= dev->real_num_tx_queues)) {
5275                 do {
5276                         txq -= dev->real_num_tx_queues;
5277                 } while (txq >= dev->real_num_tx_queues);
5278         }
5279         return txq;
5280 }
5281
5282 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
5283                                               struct sk_buff *skb,
5284                                               bool all_slaves)
5285 {
5286         struct bonding *bond = netdev_priv(master_dev);
5287         struct bond_up_slave *slaves;
5288         struct slave *slave = NULL;
5289
5290         switch (BOND_MODE(bond)) {
5291         case BOND_MODE_ROUNDROBIN:
5292                 slave = bond_xmit_roundrobin_slave_get(bond, skb);
5293                 break;
5294         case BOND_MODE_ACTIVEBACKUP:
5295                 slave = bond_xmit_activebackup_slave_get(bond);
5296                 break;
5297         case BOND_MODE_8023AD:
5298         case BOND_MODE_XOR:
5299                 if (all_slaves)
5300                         slaves = rcu_dereference(bond->all_slaves);
5301                 else
5302                         slaves = rcu_dereference(bond->usable_slaves);
5303                 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
5304                 break;
5305         case BOND_MODE_BROADCAST:
5306                 break;
5307         case BOND_MODE_ALB:
5308                 slave = bond_xmit_alb_slave_get(bond, skb);
5309                 break;
5310         case BOND_MODE_TLB:
5311                 slave = bond_xmit_tlb_slave_get(bond, skb);
5312                 break;
5313         default:
5314                 /* Should never happen, mode already checked */
5315                 WARN_ONCE(true, "Unknown bonding mode");
5316                 break;
5317         }
5318
5319         if (slave)
5320                 return slave->dev;
5321         return NULL;
5322 }
5323
5324 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow)
5325 {
5326         switch (sk->sk_family) {
5327 #if IS_ENABLED(CONFIG_IPV6)
5328         case AF_INET6:
5329                 if (ipv6_only_sock(sk) ||
5330                     ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) {
5331                         flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
5332                         flow->addrs.v6addrs.src = inet6_sk(sk)->saddr;
5333                         flow->addrs.v6addrs.dst = sk->sk_v6_daddr;
5334                         break;
5335                 }
5336                 fallthrough;
5337 #endif
5338         default: /* AF_INET */
5339                 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
5340                 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr;
5341                 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr;
5342                 break;
5343         }
5344
5345         flow->ports.src = inet_sk(sk)->inet_sport;
5346         flow->ports.dst = inet_sk(sk)->inet_dport;
5347 }
5348
5349 /**
5350  * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields
5351  * @sk: socket to use for headers
5352  *
5353  * This function will extract the necessary field from the socket and use
5354  * them to generate a hash based on the LAYER34 xmit_policy.
5355  * Assumes that sk is a TCP or UDP socket.
5356  */
5357 static u32 bond_sk_hash_l34(struct sock *sk)
5358 {
5359         struct flow_keys flow;
5360         u32 hash;
5361
5362         bond_sk_to_flow(sk, &flow);
5363
5364         /* L4 */
5365         memcpy(&hash, &flow.ports.ports, sizeof(hash));
5366         /* L3 */
5367         return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34);
5368 }
5369
5370 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond,
5371                                                   struct sock *sk)
5372 {
5373         struct bond_up_slave *slaves;
5374         struct slave *slave;
5375         unsigned int count;
5376         u32 hash;
5377
5378         slaves = rcu_dereference(bond->usable_slaves);
5379         count = slaves ? READ_ONCE(slaves->count) : 0;
5380         if (unlikely(!count))
5381                 return NULL;
5382
5383         hash = bond_sk_hash_l34(sk);
5384         slave = slaves->arr[hash % count];
5385
5386         return slave->dev;
5387 }
5388
5389 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev,
5390                                                 struct sock *sk)
5391 {
5392         struct bonding *bond = netdev_priv(dev);
5393         struct net_device *lower = NULL;
5394
5395         rcu_read_lock();
5396         if (bond_sk_check(bond))
5397                 lower = __bond_sk_get_lower_dev(bond, sk);
5398         rcu_read_unlock();
5399
5400         return lower;
5401 }
5402
5403 #if IS_ENABLED(CONFIG_TLS_DEVICE)
5404 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb,
5405                                         struct net_device *dev)
5406 {
5407         struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev);
5408
5409         /* tls_netdev might become NULL, even if tls_is_skb_tx_device_offloaded
5410          * was true, if tls_device_down is running in parallel, but it's OK,
5411          * because bond_get_slave_by_dev has a NULL check.
5412          */
5413         if (likely(bond_get_slave_by_dev(bond, tls_netdev)))
5414                 return bond_dev_queue_xmit(bond, skb, tls_netdev);
5415         return bond_tx_drop(dev, skb);
5416 }
5417 #endif
5418
5419 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
5420 {
5421         struct bonding *bond = netdev_priv(dev);
5422
5423         if (bond_should_override_tx_queue(bond) &&
5424             !bond_slave_override(bond, skb))
5425                 return NETDEV_TX_OK;
5426
5427 #if IS_ENABLED(CONFIG_TLS_DEVICE)
5428         if (tls_is_skb_tx_device_offloaded(skb))
5429                 return bond_tls_device_xmit(bond, skb, dev);
5430 #endif
5431
5432         switch (BOND_MODE(bond)) {
5433         case BOND_MODE_ROUNDROBIN:
5434                 return bond_xmit_roundrobin(skb, dev);
5435         case BOND_MODE_ACTIVEBACKUP:
5436                 return bond_xmit_activebackup(skb, dev);
5437         case BOND_MODE_8023AD:
5438         case BOND_MODE_XOR:
5439                 return bond_3ad_xor_xmit(skb, dev);
5440         case BOND_MODE_BROADCAST:
5441                 return bond_xmit_broadcast(skb, dev);
5442         case BOND_MODE_ALB:
5443                 return bond_alb_xmit(skb, dev);
5444         case BOND_MODE_TLB:
5445                 return bond_tlb_xmit(skb, dev);
5446         default:
5447                 /* Should never happen, mode already checked */
5448                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
5449                 WARN_ON_ONCE(1);
5450                 return bond_tx_drop(dev, skb);
5451         }
5452 }
5453
5454 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
5455 {
5456         struct bonding *bond = netdev_priv(dev);
5457         netdev_tx_t ret = NETDEV_TX_OK;
5458
5459         /* If we risk deadlock from transmitting this in the
5460          * netpoll path, tell netpoll to queue the frame for later tx
5461          */
5462         if (unlikely(is_netpoll_tx_blocked(dev)))
5463                 return NETDEV_TX_BUSY;
5464
5465         rcu_read_lock();
5466         if (bond_has_slaves(bond))
5467                 ret = __bond_start_xmit(skb, dev);
5468         else
5469                 ret = bond_tx_drop(dev, skb);
5470         rcu_read_unlock();
5471
5472         return ret;
5473 }
5474
5475 static struct net_device *
5476 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp)
5477 {
5478         struct bonding *bond = netdev_priv(bond_dev);
5479         struct slave *slave;
5480
5481         /* Caller needs to hold rcu_read_lock() */
5482
5483         switch (BOND_MODE(bond)) {
5484         case BOND_MODE_ROUNDROBIN:
5485                 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp);
5486                 break;
5487
5488         case BOND_MODE_ACTIVEBACKUP:
5489                 slave = bond_xmit_activebackup_slave_get(bond);
5490                 break;
5491
5492         case BOND_MODE_8023AD:
5493         case BOND_MODE_XOR:
5494                 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp);
5495                 break;
5496
5497         default:
5498                 /* Should never happen. Mode guarded by bond_xdp_check() */
5499                 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond));
5500                 WARN_ON_ONCE(1);
5501                 return NULL;
5502         }
5503
5504         if (slave)
5505                 return slave->dev;
5506
5507         return NULL;
5508 }
5509
5510 static int bond_xdp_xmit(struct net_device *bond_dev,
5511                          int n, struct xdp_frame **frames, u32 flags)
5512 {
5513         int nxmit, err = -ENXIO;
5514
5515         rcu_read_lock();
5516
5517         for (nxmit = 0; nxmit < n; nxmit++) {
5518                 struct xdp_frame *frame = frames[nxmit];
5519                 struct xdp_frame *frames1[] = {frame};
5520                 struct net_device *slave_dev;
5521                 struct xdp_buff xdp;
5522
5523                 xdp_convert_frame_to_buff(frame, &xdp);
5524
5525                 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp);
5526                 if (!slave_dev) {
5527                         err = -ENXIO;
5528                         break;
5529                 }
5530
5531                 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags);
5532                 if (err < 1)
5533                         break;
5534         }
5535
5536         rcu_read_unlock();
5537
5538         /* If error happened on the first frame then we can pass the error up, otherwise
5539          * report the number of frames that were xmitted.
5540          */
5541         if (err < 0)
5542                 return (nxmit == 0 ? err : nxmit);
5543
5544         return nxmit;
5545 }
5546
5547 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog,
5548                         struct netlink_ext_ack *extack)
5549 {
5550         struct bonding *bond = netdev_priv(dev);
5551         struct list_head *iter;
5552         struct slave *slave, *rollback_slave;
5553         struct bpf_prog *old_prog;
5554         struct netdev_bpf xdp = {
5555                 .command = XDP_SETUP_PROG,
5556                 .flags   = 0,
5557                 .prog    = prog,
5558                 .extack  = extack,
5559         };
5560         int err;
5561
5562         ASSERT_RTNL();
5563
5564         if (!bond_xdp_check(bond))
5565                 return -EOPNOTSUPP;
5566
5567         old_prog = bond->xdp_prog;
5568         bond->xdp_prog = prog;
5569
5570         bond_for_each_slave(bond, slave, iter) {
5571                 struct net_device *slave_dev = slave->dev;
5572
5573                 if (!slave_dev->netdev_ops->ndo_bpf ||
5574                     !slave_dev->netdev_ops->ndo_xdp_xmit) {
5575                         SLAVE_NL_ERR(dev, slave_dev, extack,
5576                                      "Slave device does not support XDP");
5577                         err = -EOPNOTSUPP;
5578                         goto err;
5579                 }
5580
5581                 if (dev_xdp_prog_count(slave_dev) > 0) {
5582                         SLAVE_NL_ERR(dev, slave_dev, extack,
5583                                      "Slave has XDP program loaded, please unload before enslaving");
5584                         err = -EOPNOTSUPP;
5585                         goto err;
5586                 }
5587
5588                 err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
5589                 if (err < 0) {
5590                         /* ndo_bpf() sets extack error message */
5591                         slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err);
5592                         goto err;
5593                 }
5594                 if (prog)
5595                         bpf_prog_inc(prog);
5596         }
5597
5598         if (prog) {
5599                 static_branch_inc(&bpf_master_redirect_enabled_key);
5600         } else if (old_prog) {
5601                 bpf_prog_put(old_prog);
5602                 static_branch_dec(&bpf_master_redirect_enabled_key);
5603         }
5604
5605         return 0;
5606
5607 err:
5608         /* unwind the program changes */
5609         bond->xdp_prog = old_prog;
5610         xdp.prog = old_prog;
5611         xdp.extack = NULL; /* do not overwrite original error */
5612
5613         bond_for_each_slave(bond, rollback_slave, iter) {
5614                 struct net_device *slave_dev = rollback_slave->dev;
5615                 int err_unwind;
5616
5617                 if (slave == rollback_slave)
5618                         break;
5619
5620                 err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
5621                 if (err_unwind < 0)
5622                         slave_err(dev, slave_dev,
5623                                   "Error %d when unwinding XDP program change\n", err_unwind);
5624                 else if (xdp.prog)
5625                         bpf_prog_inc(xdp.prog);
5626         }
5627         return err;
5628 }
5629
5630 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp)
5631 {
5632         switch (xdp->command) {
5633         case XDP_SETUP_PROG:
5634                 return bond_xdp_set(dev, xdp->prog, xdp->extack);
5635         default:
5636                 return -EINVAL;
5637         }
5638 }
5639
5640 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
5641 {
5642         if (speed == 0 || speed == SPEED_UNKNOWN)
5643                 speed = slave->speed;
5644         else
5645                 speed = min(speed, slave->speed);
5646
5647         return speed;
5648 }
5649
5650 /* Set the BOND_PHC_INDEX flag to notify user space */
5651 static int bond_set_phc_index_flag(struct kernel_hwtstamp_config *kernel_cfg)
5652 {
5653         struct ifreq *ifr = kernel_cfg->ifr;
5654         struct hwtstamp_config cfg;
5655
5656         if (kernel_cfg->copied_to_user) {
5657                 /* Lower device has a legacy implementation */
5658                 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
5659                         return -EFAULT;
5660
5661                 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX;
5662                 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
5663                         return -EFAULT;
5664         } else {
5665                 kernel_cfg->flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX;
5666         }
5667
5668         return 0;
5669 }
5670
5671 static int bond_hwtstamp_get(struct net_device *dev,
5672                              struct kernel_hwtstamp_config *cfg)
5673 {
5674         struct bonding *bond = netdev_priv(dev);
5675         struct net_device *real_dev;
5676         int err;
5677
5678         real_dev = bond_option_active_slave_get_rcu(bond);
5679         if (!real_dev)
5680                 return -EOPNOTSUPP;
5681
5682         err = generic_hwtstamp_get_lower(real_dev, cfg);
5683         if (err)
5684                 return err;
5685
5686         return bond_set_phc_index_flag(cfg);
5687 }
5688
5689 static int bond_hwtstamp_set(struct net_device *dev,
5690                              struct kernel_hwtstamp_config *cfg,
5691                              struct netlink_ext_ack *extack)
5692 {
5693         struct bonding *bond = netdev_priv(dev);
5694         struct net_device *real_dev;
5695         int err;
5696
5697         if (!(cfg->flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX))
5698                 return -EOPNOTSUPP;
5699
5700         real_dev = bond_option_active_slave_get_rcu(bond);
5701         if (!real_dev)
5702                 return -EOPNOTSUPP;
5703
5704         err = generic_hwtstamp_set_lower(real_dev, cfg, extack);
5705         if (err)
5706                 return err;
5707
5708         return bond_set_phc_index_flag(cfg);
5709 }
5710
5711 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
5712                                            struct ethtool_link_ksettings *cmd)
5713 {
5714         struct bonding *bond = netdev_priv(bond_dev);
5715         struct list_head *iter;
5716         struct slave *slave;
5717         u32 speed = 0;
5718
5719         cmd->base.duplex = DUPLEX_UNKNOWN;
5720         cmd->base.port = PORT_OTHER;
5721
5722         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
5723          * do not need to check mode.  Though link speed might not represent
5724          * the true receive or transmit bandwidth (not all modes are symmetric)
5725          * this is an accurate maximum.
5726          */
5727         bond_for_each_slave(bond, slave, iter) {
5728                 if (bond_slave_can_tx(slave)) {
5729                         bond_update_speed_duplex(slave);
5730                         if (slave->speed != SPEED_UNKNOWN) {
5731                                 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
5732                                         speed = bond_mode_bcast_speed(slave,
5733                                                                       speed);
5734                                 else
5735                                         speed += slave->speed;
5736                         }
5737                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
5738                             slave->duplex != DUPLEX_UNKNOWN)
5739                                 cmd->base.duplex = slave->duplex;
5740                 }
5741         }
5742         cmd->base.speed = speed ? : SPEED_UNKNOWN;
5743
5744         return 0;
5745 }
5746
5747 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
5748                                      struct ethtool_drvinfo *drvinfo)
5749 {
5750         strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
5751         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
5752                  BOND_ABI_VERSION);
5753 }
5754
5755 static int bond_ethtool_get_ts_info(struct net_device *bond_dev,
5756                                     struct ethtool_ts_info *info)
5757 {
5758         struct bonding *bond = netdev_priv(bond_dev);
5759         struct ethtool_ts_info ts_info;
5760         struct net_device *real_dev;
5761         bool sw_tx_support = false;
5762         struct list_head *iter;
5763         struct slave *slave;
5764         int ret = 0;
5765
5766         rcu_read_lock();
5767         real_dev = bond_option_active_slave_get_rcu(bond);
5768         dev_hold(real_dev);
5769         rcu_read_unlock();
5770
5771         if (real_dev) {
5772                 ret = ethtool_get_ts_info_by_layer(real_dev, info);
5773         } else {
5774                 /* Check if all slaves support software tx timestamping */
5775                 rcu_read_lock();
5776                 bond_for_each_slave_rcu(bond, slave, iter) {
5777                         ret = ethtool_get_ts_info_by_layer(slave->dev, &ts_info);
5778                         if (!ret && (ts_info.so_timestamping & SOF_TIMESTAMPING_TX_SOFTWARE)) {
5779                                 sw_tx_support = true;
5780                                 continue;
5781                         }
5782
5783                         sw_tx_support = false;
5784                         break;
5785                 }
5786                 rcu_read_unlock();
5787         }
5788
5789         if (sw_tx_support)
5790                 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE;
5791
5792         dev_put(real_dev);
5793         return ret;
5794 }
5795
5796 static const struct ethtool_ops bond_ethtool_ops = {
5797         .get_drvinfo            = bond_ethtool_get_drvinfo,
5798         .get_link               = ethtool_op_get_link,
5799         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
5800         .get_ts_info            = bond_ethtool_get_ts_info,
5801 };
5802
5803 static const struct net_device_ops bond_netdev_ops = {
5804         .ndo_init               = bond_init,
5805         .ndo_uninit             = bond_uninit,
5806         .ndo_open               = bond_open,
5807         .ndo_stop               = bond_close,
5808         .ndo_start_xmit         = bond_start_xmit,
5809         .ndo_select_queue       = bond_select_queue,
5810         .ndo_get_stats64        = bond_get_stats,
5811         .ndo_eth_ioctl          = bond_eth_ioctl,
5812         .ndo_siocbond           = bond_do_ioctl,
5813         .ndo_siocdevprivate     = bond_siocdevprivate,
5814         .ndo_change_rx_flags    = bond_change_rx_flags,
5815         .ndo_set_rx_mode        = bond_set_rx_mode,
5816         .ndo_change_mtu         = bond_change_mtu,
5817         .ndo_set_mac_address    = bond_set_mac_address,
5818         .ndo_neigh_setup        = bond_neigh_setup,
5819         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
5820         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
5821 #ifdef CONFIG_NET_POLL_CONTROLLER
5822         .ndo_netpoll_setup      = bond_netpoll_setup,
5823         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
5824         .ndo_poll_controller    = bond_poll_controller,
5825 #endif
5826         .ndo_add_slave          = bond_enslave,
5827         .ndo_del_slave          = bond_release,
5828         .ndo_fix_features       = bond_fix_features,
5829         .ndo_features_check     = passthru_features_check,
5830         .ndo_get_xmit_slave     = bond_xmit_get_slave,
5831         .ndo_sk_get_lower_dev   = bond_sk_get_lower_dev,
5832         .ndo_bpf                = bond_xdp,
5833         .ndo_xdp_xmit           = bond_xdp_xmit,
5834         .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave,
5835         .ndo_hwtstamp_get       = bond_hwtstamp_get,
5836         .ndo_hwtstamp_set       = bond_hwtstamp_set,
5837 };
5838
5839 static const struct device_type bond_type = {
5840         .name = "bond",
5841 };
5842
5843 static void bond_destructor(struct net_device *bond_dev)
5844 {
5845         struct bonding *bond = netdev_priv(bond_dev);
5846
5847         if (bond->wq)
5848                 destroy_workqueue(bond->wq);
5849
5850         free_percpu(bond->rr_tx_counter);
5851 }
5852
5853 void bond_setup(struct net_device *bond_dev)
5854 {
5855         struct bonding *bond = netdev_priv(bond_dev);
5856
5857         spin_lock_init(&bond->mode_lock);
5858         bond->params = bonding_defaults;
5859
5860         /* Initialize pointers */
5861         bond->dev = bond_dev;
5862
5863         /* Initialize the device entry points */
5864         ether_setup(bond_dev);
5865         bond_dev->max_mtu = ETH_MAX_MTU;
5866         bond_dev->netdev_ops = &bond_netdev_ops;
5867         bond_dev->ethtool_ops = &bond_ethtool_ops;
5868
5869         bond_dev->needs_free_netdev = true;
5870         bond_dev->priv_destructor = bond_destructor;
5871
5872         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
5873
5874         /* Initialize the device options */
5875         bond_dev->flags |= IFF_MASTER;
5876         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
5877         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
5878
5879 #ifdef CONFIG_XFRM_OFFLOAD
5880         /* set up xfrm device ops (only supported in active-backup right now) */
5881         bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
5882         INIT_LIST_HEAD(&bond->ipsec_list);
5883         spin_lock_init(&bond->ipsec_lock);
5884 #endif /* CONFIG_XFRM_OFFLOAD */
5885
5886         /* don't acquire bond device's netif_tx_lock when transmitting */
5887         bond_dev->features |= NETIF_F_LLTX;
5888
5889         /* By default, we declare the bond to be fully
5890          * VLAN hardware accelerated capable. Special
5891          * care is taken in the various xmit functions
5892          * when there are slaves that are not hw accel
5893          * capable
5894          */
5895
5896         /* Don't allow bond devices to change network namespaces. */
5897         bond_dev->features |= NETIF_F_NETNS_LOCAL;
5898
5899         bond_dev->hw_features = BOND_VLAN_FEATURES |
5900                                 NETIF_F_HW_VLAN_CTAG_RX |
5901                                 NETIF_F_HW_VLAN_CTAG_FILTER |
5902                                 NETIF_F_HW_VLAN_STAG_RX |
5903                                 NETIF_F_HW_VLAN_STAG_FILTER;
5904
5905         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
5906         bond_dev->features |= bond_dev->hw_features;
5907         bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
5908 #ifdef CONFIG_XFRM_OFFLOAD
5909         bond_dev->hw_features |= BOND_XFRM_FEATURES;
5910         /* Only enable XFRM features if this is an active-backup config */
5911         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
5912                 bond_dev->features |= BOND_XFRM_FEATURES;
5913 #endif /* CONFIG_XFRM_OFFLOAD */
5914 }
5915
5916 /* Destroy a bonding device.
5917  * Must be under rtnl_lock when this function is called.
5918  */
5919 static void bond_uninit(struct net_device *bond_dev)
5920 {
5921         struct bonding *bond = netdev_priv(bond_dev);
5922         struct list_head *iter;
5923         struct slave *slave;
5924
5925         bond_netpoll_cleanup(bond_dev);
5926
5927         /* Release the bonded slaves */
5928         bond_for_each_slave(bond, slave, iter)
5929                 __bond_release_one(bond_dev, slave->dev, true, true);
5930         netdev_info(bond_dev, "Released all slaves\n");
5931
5932         bond_set_slave_arr(bond, NULL, NULL);
5933
5934         list_del(&bond->bond_list);
5935
5936         bond_debug_unregister(bond);
5937 }
5938
5939 /*------------------------- Module initialization ---------------------------*/
5940
5941 static int __init bond_check_params(struct bond_params *params)
5942 {
5943         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
5944         struct bond_opt_value newval;
5945         const struct bond_opt_value *valptr;
5946         int arp_all_targets_value = 0;
5947         u16 ad_actor_sys_prio = 0;
5948         u16 ad_user_port_key = 0;
5949         __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
5950         int arp_ip_count;
5951         int bond_mode   = BOND_MODE_ROUNDROBIN;
5952         int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
5953         int lacp_fast = 0;
5954         int tlb_dynamic_lb;
5955
5956         /* Convert string parameters. */
5957         if (mode) {
5958                 bond_opt_initstr(&newval, mode);
5959                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
5960                 if (!valptr) {
5961                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
5962                         return -EINVAL;
5963                 }
5964                 bond_mode = valptr->value;
5965         }
5966
5967         if (xmit_hash_policy) {
5968                 if (bond_mode == BOND_MODE_ROUNDROBIN ||
5969                     bond_mode == BOND_MODE_ACTIVEBACKUP ||
5970                     bond_mode == BOND_MODE_BROADCAST) {
5971                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
5972                                 bond_mode_name(bond_mode));
5973                 } else {
5974                         bond_opt_initstr(&newval, xmit_hash_policy);
5975                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
5976                                                 &newval);
5977                         if (!valptr) {
5978                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
5979                                        xmit_hash_policy);
5980                                 return -EINVAL;
5981                         }
5982                         xmit_hashtype = valptr->value;
5983                 }
5984         }
5985
5986         if (lacp_rate) {
5987                 if (bond_mode != BOND_MODE_8023AD) {
5988                         pr_info("lacp_rate param is irrelevant in mode %s\n",
5989                                 bond_mode_name(bond_mode));
5990                 } else {
5991                         bond_opt_initstr(&newval, lacp_rate);
5992                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
5993                                                 &newval);
5994                         if (!valptr) {
5995                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
5996                                        lacp_rate);
5997                                 return -EINVAL;
5998                         }
5999                         lacp_fast = valptr->value;
6000                 }
6001         }
6002
6003         if (ad_select) {
6004                 bond_opt_initstr(&newval, ad_select);
6005                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
6006                                         &newval);
6007                 if (!valptr) {
6008                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
6009                         return -EINVAL;
6010                 }
6011                 params->ad_select = valptr->value;
6012                 if (bond_mode != BOND_MODE_8023AD)
6013                         pr_warn("ad_select param only affects 802.3ad mode\n");
6014         } else {
6015                 params->ad_select = BOND_AD_STABLE;
6016         }
6017
6018         if (max_bonds < 0) {
6019                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
6020                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
6021                 max_bonds = BOND_DEFAULT_MAX_BONDS;
6022         }
6023
6024         if (miimon < 0) {
6025                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6026                         miimon, INT_MAX);
6027                 miimon = 0;
6028         }
6029
6030         if (updelay < 0) {
6031                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6032                         updelay, INT_MAX);
6033                 updelay = 0;
6034         }
6035
6036         if (downdelay < 0) {
6037                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6038                         downdelay, INT_MAX);
6039                 downdelay = 0;
6040         }
6041
6042         if ((use_carrier != 0) && (use_carrier != 1)) {
6043                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
6044                         use_carrier);
6045                 use_carrier = 1;
6046         }
6047
6048         if (num_peer_notif < 0 || num_peer_notif > 255) {
6049                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
6050                         num_peer_notif);
6051                 num_peer_notif = 1;
6052         }
6053
6054         /* reset values for 802.3ad/TLB/ALB */
6055         if (!bond_mode_uses_arp(bond_mode)) {
6056                 if (!miimon) {
6057                         pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
6058                         pr_warn("Forcing miimon to 100msec\n");
6059                         miimon = BOND_DEFAULT_MIIMON;
6060                 }
6061         }
6062
6063         if (tx_queues < 1 || tx_queues > 255) {
6064                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
6065                         tx_queues, BOND_DEFAULT_TX_QUEUES);
6066                 tx_queues = BOND_DEFAULT_TX_QUEUES;
6067         }
6068
6069         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
6070                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
6071                         all_slaves_active);
6072                 all_slaves_active = 0;
6073         }
6074
6075         if (resend_igmp < 0 || resend_igmp > 255) {
6076                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
6077                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
6078                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
6079         }
6080
6081         bond_opt_initval(&newval, packets_per_slave);
6082         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
6083                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
6084                         packets_per_slave, USHRT_MAX);
6085                 packets_per_slave = 1;
6086         }
6087
6088         if (bond_mode == BOND_MODE_ALB) {
6089                 pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
6090                           updelay);
6091         }
6092
6093         if (!miimon) {
6094                 if (updelay || downdelay) {
6095                         /* just warn the user the up/down delay will have
6096                          * no effect since miimon is zero...
6097                          */
6098                         pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
6099                                 updelay, downdelay);
6100                 }
6101         } else {
6102                 /* don't allow arp monitoring */
6103                 if (arp_interval) {
6104                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
6105                                 miimon, arp_interval);
6106                         arp_interval = 0;
6107                 }
6108
6109                 if ((updelay % miimon) != 0) {
6110                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
6111                                 updelay, miimon, (updelay / miimon) * miimon);
6112                 }
6113
6114                 updelay /= miimon;
6115
6116                 if ((downdelay % miimon) != 0) {
6117                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
6118                                 downdelay, miimon,
6119                                 (downdelay / miimon) * miimon);
6120                 }
6121
6122                 downdelay /= miimon;
6123         }
6124
6125         if (arp_interval < 0) {
6126                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6127                         arp_interval, INT_MAX);
6128                 arp_interval = 0;
6129         }
6130
6131         for (arp_ip_count = 0, i = 0;
6132              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
6133                 __be32 ip;
6134
6135                 /* not a complete check, but good enough to catch mistakes */
6136                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
6137                     !bond_is_ip_target_ok(ip)) {
6138                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
6139                                 arp_ip_target[i]);
6140                         arp_interval = 0;
6141                 } else {
6142                         if (bond_get_targets_ip(arp_target, ip) == -1)
6143                                 arp_target[arp_ip_count++] = ip;
6144                         else
6145                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
6146                                         &ip);
6147                 }
6148         }
6149
6150         if (arp_interval && !arp_ip_count) {
6151                 /* don't allow arping if no arp_ip_target given... */
6152                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
6153                         arp_interval);
6154                 arp_interval = 0;
6155         }
6156
6157         if (arp_validate) {
6158                 if (!arp_interval) {
6159                         pr_err("arp_validate requires arp_interval\n");
6160                         return -EINVAL;
6161                 }
6162
6163                 bond_opt_initstr(&newval, arp_validate);
6164                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
6165                                         &newval);
6166                 if (!valptr) {
6167                         pr_err("Error: invalid arp_validate \"%s\"\n",
6168                                arp_validate);
6169                         return -EINVAL;
6170                 }
6171                 arp_validate_value = valptr->value;
6172         } else {
6173                 arp_validate_value = 0;
6174         }
6175
6176         if (arp_all_targets) {
6177                 bond_opt_initstr(&newval, arp_all_targets);
6178                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
6179                                         &newval);
6180                 if (!valptr) {
6181                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
6182                                arp_all_targets);
6183                         arp_all_targets_value = 0;
6184                 } else {
6185                         arp_all_targets_value = valptr->value;
6186                 }
6187         }
6188
6189         if (miimon) {
6190                 pr_info("MII link monitoring set to %d ms\n", miimon);
6191         } else if (arp_interval) {
6192                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
6193                                           arp_validate_value);
6194                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
6195                         arp_interval, valptr->string, arp_ip_count);
6196
6197                 for (i = 0; i < arp_ip_count; i++)
6198                         pr_cont(" %s", arp_ip_target[i]);
6199
6200                 pr_cont("\n");
6201
6202         } else if (max_bonds) {
6203                 /* miimon and arp_interval not set, we need one so things
6204                  * work as expected, see bonding.txt for details
6205                  */
6206                 pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details\n");
6207         }
6208
6209         if (primary && !bond_mode_uses_primary(bond_mode)) {
6210                 /* currently, using a primary only makes sense
6211                  * in active backup, TLB or ALB modes
6212                  */
6213                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
6214                         primary, bond_mode_name(bond_mode));
6215                 primary = NULL;
6216         }
6217
6218         if (primary && primary_reselect) {
6219                 bond_opt_initstr(&newval, primary_reselect);
6220                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
6221                                         &newval);
6222                 if (!valptr) {
6223                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
6224                                primary_reselect);
6225                         return -EINVAL;
6226                 }
6227                 primary_reselect_value = valptr->value;
6228         } else {
6229                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
6230         }
6231
6232         if (fail_over_mac) {
6233                 bond_opt_initstr(&newval, fail_over_mac);
6234                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
6235                                         &newval);
6236                 if (!valptr) {
6237                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
6238                                fail_over_mac);
6239                         return -EINVAL;
6240                 }
6241                 fail_over_mac_value = valptr->value;
6242                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
6243                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
6244         } else {
6245                 fail_over_mac_value = BOND_FOM_NONE;
6246         }
6247
6248         bond_opt_initstr(&newval, "default");
6249         valptr = bond_opt_parse(
6250                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
6251                                      &newval);
6252         if (!valptr) {
6253                 pr_err("Error: No ad_actor_sys_prio default value");
6254                 return -EINVAL;
6255         }
6256         ad_actor_sys_prio = valptr->value;
6257
6258         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
6259                                 &newval);
6260         if (!valptr) {
6261                 pr_err("Error: No ad_user_port_key default value");
6262                 return -EINVAL;
6263         }
6264         ad_user_port_key = valptr->value;
6265
6266         bond_opt_initstr(&newval, "default");
6267         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
6268         if (!valptr) {
6269                 pr_err("Error: No tlb_dynamic_lb default value");
6270                 return -EINVAL;
6271         }
6272         tlb_dynamic_lb = valptr->value;
6273
6274         if (lp_interval == 0) {
6275                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
6276                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
6277                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
6278         }
6279
6280         /* fill params struct with the proper values */
6281         params->mode = bond_mode;
6282         params->xmit_policy = xmit_hashtype;
6283         params->miimon = miimon;
6284         params->num_peer_notif = num_peer_notif;
6285         params->arp_interval = arp_interval;
6286         params->arp_validate = arp_validate_value;
6287         params->arp_all_targets = arp_all_targets_value;
6288         params->missed_max = 2;
6289         params->updelay = updelay;
6290         params->downdelay = downdelay;
6291         params->peer_notif_delay = 0;
6292         params->use_carrier = use_carrier;
6293         params->lacp_active = 1;
6294         params->lacp_fast = lacp_fast;
6295         params->primary[0] = 0;
6296         params->primary_reselect = primary_reselect_value;
6297         params->fail_over_mac = fail_over_mac_value;
6298         params->tx_queues = tx_queues;
6299         params->all_slaves_active = all_slaves_active;
6300         params->resend_igmp = resend_igmp;
6301         params->min_links = min_links;
6302         params->lp_interval = lp_interval;
6303         params->packets_per_slave = packets_per_slave;
6304         params->tlb_dynamic_lb = tlb_dynamic_lb;
6305         params->ad_actor_sys_prio = ad_actor_sys_prio;
6306         eth_zero_addr(params->ad_actor_system);
6307         params->ad_user_port_key = ad_user_port_key;
6308         params->coupled_control = 1;
6309         if (packets_per_slave > 0) {
6310                 params->reciprocal_packets_per_slave =
6311                         reciprocal_value(packets_per_slave);
6312         } else {
6313                 /* reciprocal_packets_per_slave is unused if
6314                  * packets_per_slave is 0 or 1, just initialize it
6315                  */
6316                 params->reciprocal_packets_per_slave =
6317                         (struct reciprocal_value) { 0 };
6318         }
6319
6320         if (primary)
6321                 strscpy_pad(params->primary, primary, sizeof(params->primary));
6322
6323         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
6324 #if IS_ENABLED(CONFIG_IPV6)
6325         memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS);
6326 #endif
6327
6328         return 0;
6329 }
6330
6331 /* Called from registration process */
6332 static int bond_init(struct net_device *bond_dev)
6333 {
6334         struct bonding *bond = netdev_priv(bond_dev);
6335         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
6336
6337         netdev_dbg(bond_dev, "Begin bond_init\n");
6338
6339         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
6340         if (!bond->wq)
6341                 return -ENOMEM;
6342
6343         bond->notifier_ctx = false;
6344
6345         spin_lock_init(&bond->stats_lock);
6346         netdev_lockdep_set_classes(bond_dev);
6347
6348         list_add_tail(&bond->bond_list, &bn->dev_list);
6349
6350         bond_prepare_sysfs_group(bond);
6351
6352         bond_debug_register(bond);
6353
6354         /* Ensure valid dev_addr */
6355         if (is_zero_ether_addr(bond_dev->dev_addr) &&
6356             bond_dev->addr_assign_type == NET_ADDR_PERM)
6357                 eth_hw_addr_random(bond_dev);
6358
6359         return 0;
6360 }
6361
6362 unsigned int bond_get_num_tx_queues(void)
6363 {
6364         return tx_queues;
6365 }
6366
6367 /* Create a new bond based on the specified name and bonding parameters.
6368  * If name is NULL, obtain a suitable "bond%d" name for us.
6369  * Caller must NOT hold rtnl_lock; we need to release it here before we
6370  * set up our sysfs entries.
6371  */
6372 int bond_create(struct net *net, const char *name)
6373 {
6374         struct net_device *bond_dev;
6375         struct bonding *bond;
6376         int res = -ENOMEM;
6377
6378         rtnl_lock();
6379
6380         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
6381                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
6382                                    bond_setup, tx_queues);
6383         if (!bond_dev)
6384                 goto out;
6385
6386         bond = netdev_priv(bond_dev);
6387         dev_net_set(bond_dev, net);
6388         bond_dev->rtnl_link_ops = &bond_link_ops;
6389
6390         res = register_netdevice(bond_dev);
6391         if (res < 0) {
6392                 free_netdev(bond_dev);
6393                 goto out;
6394         }
6395
6396         netif_carrier_off(bond_dev);
6397
6398         bond_work_init_all(bond);
6399
6400 out:
6401         rtnl_unlock();
6402         return res;
6403 }
6404
6405 static int __net_init bond_net_init(struct net *net)
6406 {
6407         struct bond_net *bn = net_generic(net, bond_net_id);
6408
6409         bn->net = net;
6410         INIT_LIST_HEAD(&bn->dev_list);
6411
6412         bond_create_proc_dir(bn);
6413         bond_create_sysfs(bn);
6414
6415         return 0;
6416 }
6417
6418 /* According to commit 69b0216ac255 ("bonding: fix bonding_masters
6419  * race condition in bond unloading") we need to remove sysfs files
6420  * before we remove our devices (done later in bond_net_exit_batch_rtnl())
6421  */
6422 static void __net_exit bond_net_pre_exit(struct net *net)
6423 {
6424         struct bond_net *bn = net_generic(net, bond_net_id);
6425
6426         bond_destroy_sysfs(bn);
6427 }
6428
6429 static void __net_exit bond_net_exit_batch_rtnl(struct list_head *net_list,
6430                                                 struct list_head *dev_kill_list)
6431 {
6432         struct bond_net *bn;
6433         struct net *net;
6434
6435         /* Kill off any bonds created after unregistering bond rtnl ops */
6436         list_for_each_entry(net, net_list, exit_list) {
6437                 struct bonding *bond, *tmp_bond;
6438
6439                 bn = net_generic(net, bond_net_id);
6440                 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
6441                         unregister_netdevice_queue(bond->dev, dev_kill_list);
6442         }
6443 }
6444
6445 /* According to commit 23fa5c2caae0 ("bonding: destroy proc directory
6446  * only after all bonds are gone") bond_destroy_proc_dir() is called
6447  * after bond_net_exit_batch_rtnl() has completed.
6448  */
6449 static void __net_exit bond_net_exit_batch(struct list_head *net_list)
6450 {
6451         struct bond_net *bn;
6452         struct net *net;
6453
6454         list_for_each_entry(net, net_list, exit_list) {
6455                 bn = net_generic(net, bond_net_id);
6456                 bond_destroy_proc_dir(bn);
6457         }
6458 }
6459
6460 static struct pernet_operations bond_net_ops = {
6461         .init = bond_net_init,
6462         .pre_exit = bond_net_pre_exit,
6463         .exit_batch_rtnl = bond_net_exit_batch_rtnl,
6464         .exit_batch = bond_net_exit_batch,
6465         .id   = &bond_net_id,
6466         .size = sizeof(struct bond_net),
6467 };
6468
6469 static int __init bonding_init(void)
6470 {
6471         int i;
6472         int res;
6473
6474         res = bond_check_params(&bonding_defaults);
6475         if (res)
6476                 goto out;
6477
6478         res = register_pernet_subsys(&bond_net_ops);
6479         if (res)
6480                 goto out;
6481
6482         res = bond_netlink_init();
6483         if (res)
6484                 goto err_link;
6485
6486         bond_create_debugfs();
6487
6488         for (i = 0; i < max_bonds; i++) {
6489                 res = bond_create(&init_net, NULL);
6490                 if (res)
6491                         goto err;
6492         }
6493
6494         skb_flow_dissector_init(&flow_keys_bonding,
6495                                 flow_keys_bonding_keys,
6496                                 ARRAY_SIZE(flow_keys_bonding_keys));
6497
6498         register_netdevice_notifier(&bond_netdev_notifier);
6499 out:
6500         return res;
6501 err:
6502         bond_destroy_debugfs();
6503         bond_netlink_fini();
6504 err_link:
6505         unregister_pernet_subsys(&bond_net_ops);
6506         goto out;
6507
6508 }
6509
6510 static void __exit bonding_exit(void)
6511 {
6512         unregister_netdevice_notifier(&bond_netdev_notifier);
6513
6514         bond_destroy_debugfs();
6515
6516         bond_netlink_fini();
6517         unregister_pernet_subsys(&bond_net_ops);
6518
6519 #ifdef CONFIG_NET_POLL_CONTROLLER
6520         /* Make sure we don't have an imbalance on our netpoll blocking */
6521         WARN_ON(atomic_read(&netpoll_block_tx));
6522 #endif
6523 }
6524
6525 module_init(bonding_init);
6526 module_exit(bonding_exit);
6527 MODULE_LICENSE("GPL");
6528 MODULE_DESCRIPTION(DRV_DESCRIPTION);
6529 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");