drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/fcntl.h>
  38 #include <linux/filter.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/ptrace.h>
  41 #include <linux/ioport.h>
  42 #include <linux/in.h>
  43 #include <net/ip.h>
  44 #include <linux/ip.h>
  45 #include <linux/icmp.h>
  46 #include <linux/icmpv6.h>
  47 #include <linux/tcp.h>
  48 #include <linux/udp.h>
  49 #include <linux/slab.h>
  50 #include <linux/string.h>
  51 #include <linux/init.h>
  52 #include <linux/timer.h>
  53 #include <linux/socket.h>
  54 #include <linux/ctype.h>
  55 #include <linux/inet.h>
  56 #include <linux/bitops.h>
  57 #include <linux/io.h>
  58 #include <asm/dma.h>
  59 #include <linux/uaccess.h>
  60 #include <linux/errno.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/inetdevice.h>
  63 #include <linux/igmp.h>
  64 #include <linux/etherdevice.h>
  65 #include <linux/skbuff.h>
  66 #include <net/sock.h>
  67 #include <linux/rtnetlink.h>
  68 #include <linux/smp.h>
  69 #include <linux/if_ether.h>
  70 #include <net/arp.h>
  71 #include <linux/mii.h>
  72 #include <linux/ethtool.h>
  73 #include <linux/if_vlan.h>
  74 #include <linux/if_bonding.h>
  75 #include <linux/phy.h>
  76 #include <linux/jiffies.h>
  77 #include <linux/preempt.h>
  78 #include <net/route.h>
  79 #include <net/net_namespace.h>
  80 #include <net/netns/generic.h>
  81 #include <net/pkt_sched.h>
  82 #include <linux/rculist.h>
  83 #include <net/flow_dissector.h>
  84 #include <net/xfrm.h>
  85 #include <net/bonding.h>
  86 #include <net/bond_3ad.h>
  87 #include <net/bond_alb.h>
  88 #if IS_ENABLED(CONFIG_TLS_DEVICE)
  89 #include <net/tls.h>
  90 #endif
  91 #include <net/ip6_route.h>
  92
  93 #include "bonding_priv.h"
  94
  95 /*---------------------------- Module parameters ----------------------------*/
  96
  97 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  98
  99 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
 100 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
 101 static int num_peer_notif = 1;
 102 static int miimon;
 103 static int updelay;
 104 static int downdelay;
 105 static int use_carrier  = 1;
 106 static char *mode;
 107 static char *primary;
 108 static char *primary_reselect;
 109 static char *lacp_rate;
 110 static int min_links;
 111 static char *ad_select;
 112 static char *xmit_hash_policy;
 113 static int arp_interval;
 114 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 115 static char *arp_validate;
 116 static char *arp_all_targets;
 117 static char *fail_over_mac;
 118 static int all_slaves_active;
 119 static struct bond_params bonding_defaults;
 120 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 121 static int packets_per_slave = 1;
 122 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 123
 124 module_param(max_bonds, int, 0);
 125 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 126 module_param(tx_queues, int, 0);
 127 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 128 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 129 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 130                                "failover event (alias of num_unsol_na)");
 131 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 132 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 133                                "failover event (alias of num_grat_arp)");
 134 module_param(miimon, int, 0);
 135 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 136 module_param(updelay, int, 0);
 137 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 138 module_param(downdelay, int, 0);
 139 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 140                             "in milliseconds");
 141 module_param(use_carrier, int, 0);
 142 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 143                               "0 for off, 1 for on (default)");
 144 module_param(mode, charp, 0);
 145 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 146                        "1 for active-backup, 2 for balance-xor, "
 147                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 148                        "6 for balance-alb");
 149 module_param(primary, charp, 0);
 150 MODULE_PARM_DESC(primary, "Primary network device to use");
 151 module_param(primary_reselect, charp, 0);
 152 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 153                                    "once it comes up; "
 154                                    "0 for always (default), "
 155                                    "1 for only if speed of primary is "
 156                                    "better, "
 157                                    "2 for only on active slave "
 158                                    "failure");
 159 module_param(lacp_rate, charp, 0);
 160 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 161                             "0 for slow, 1 for fast");
 162 module_param(ad_select, charp, 0);
 163 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 164                             "0 for stable (default), 1 for bandwidth, "
 165                             "2 for count");
 166 module_param(min_links, int, 0);
 167 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 168
 169 module_param(xmit_hash_policy, charp, 0);
 170 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
 171                                    "0 for layer 2 (default), 1 for layer 3+4, "
 172                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 173                                    "4 for encap layer 3+4, 5 for vlan+srcmac");
 174 module_param(arp_interval, int, 0);
 175 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 176 module_param_array(arp_ip_target, charp, NULL, 0);
 177 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 178 module_param(arp_validate, charp, 0);
 179 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 180                                "0 for none (default), 1 for active, "
 181                                "2 for backup, 3 for all");
 182 module_param(arp_all_targets, charp, 0);
 183 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 184 module_param(fail_over_mac, charp, 0);
 185 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 186                                 "the same MAC; 0 for none (default), "
 187                                 "1 for active, 2 for follow");
 188 module_param(all_slaves_active, int, 0);
 189 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 190                                      "by setting active flag for all slaves; "
 191                                      "0 for never (default), 1 for always.");
 192 module_param(resend_igmp, int, 0);
 193 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 194                               "link failure");
 195 module_param(packets_per_slave, int, 0);
 196 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 197                                     "mode; 0 for a random slave, 1 packet per "
 198                                     "slave (default), >1 packets per slave.");
 199 module_param(lp_interval, uint, 0);
 200 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 201                               "the bonding driver sends learning packets to "
 202                               "each slaves peer switch. The default is 1.");
 203
 204 /*----------------------------- Global variables ----------------------------*/
 205
 206 #ifdef CONFIG_NET_POLL_CONTROLLER
 207 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 208 #endif
 209
 210 unsigned int bond_net_id __read_mostly;
 211
 212 static const struct flow_dissector_key flow_keys_bonding_keys[] = {
 213         {
 214                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
 215                 .offset = offsetof(struct flow_keys, control),
 216         },
 217         {
 218                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
 219                 .offset = offsetof(struct flow_keys, basic),
 220         },
 221         {
 222                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 223                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
 224         },
 225         {
 226                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 227                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
 228         },
 229         {
 230                 .key_id = FLOW_DISSECTOR_KEY_TIPC,
 231                 .offset = offsetof(struct flow_keys, addrs.tipckey),
 232         },
 233         {
 234                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
 235                 .offset = offsetof(struct flow_keys, ports),
 236         },
 237         {
 238                 .key_id = FLOW_DISSECTOR_KEY_ICMP,
 239                 .offset = offsetof(struct flow_keys, icmp),
 240         },
 241         {
 242                 .key_id = FLOW_DISSECTOR_KEY_VLAN,
 243                 .offset = offsetof(struct flow_keys, vlan),
 244         },
 245         {
 246                 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
 247                 .offset = offsetof(struct flow_keys, tags),
 248         },
 249         {
 250                 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
 251                 .offset = offsetof(struct flow_keys, keyid),
 252         },
 253 };
 254
 255 static struct flow_dissector flow_keys_bonding __read_mostly;
 256
 257 /*-------------------------- Forward declarations ---------------------------*/
 258
 259 static int bond_init(struct net_device *bond_dev);
 260 static void bond_uninit(struct net_device *bond_dev);
 261 static void bond_get_stats(struct net_device *bond_dev,
 262                            struct rtnl_link_stats64 *stats);
 263 static void bond_slave_arr_handler(struct work_struct *work);
 264 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 265                                   int mod);
 266 static void bond_netdev_notify_work(struct work_struct *work);
 267
 268 /*---------------------------- General routines -----------------------------*/
 269
 270 const char *bond_mode_name(int mode)
 271 {
 272         static const char *names[] = {
 273                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 274                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 275                 [BOND_MODE_XOR] = "load balancing (xor)",
 276                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 277                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 278                 [BOND_MODE_TLB] = "transmit load balancing",
 279                 [BOND_MODE_ALB] = "adaptive load balancing",
 280         };
 281
 282         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 283                 return "unknown";
 284
 285         return names[mode];
 286 }
 287
 288 /**
 289  * bond_dev_queue_xmit - Prepare skb for xmit.
 290  *
 291  * @bond: bond device that got this skb for tx.
 292  * @skb: hw accel VLAN tagged skb to transmit
 293  * @slave_dev: slave that is supposed to xmit this skbuff
 294  */
 295 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 296                         struct net_device *slave_dev)
 297 {
 298         skb->dev = slave_dev;
 299
 300         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 301                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 302         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 303
 304         if (unlikely(netpoll_tx_running(bond->dev)))
 305                 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 306
 307         return dev_queue_xmit(skb);
 308 }
 309
 310 bool bond_sk_check(struct bonding *bond)
 311 {
 312         switch (BOND_MODE(bond)) {
 313         case BOND_MODE_8023AD:
 314         case BOND_MODE_XOR:
 315                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
 316                         return true;
 317                 fallthrough;
 318         default:
 319                 return false;
 320         }
 321 }
 322
 323 static bool bond_xdp_check(struct bonding *bond)
 324 {
 325         switch (BOND_MODE(bond)) {
 326         case BOND_MODE_ROUNDROBIN:
 327         case BOND_MODE_ACTIVEBACKUP:
 328                 return true;
 329         case BOND_MODE_8023AD:
 330         case BOND_MODE_XOR:
 331                 /* vlan+srcmac is not supported with XDP as in most cases the 802.1q
 332                  * payload is not in the packet due to hardware offload.
 333                  */
 334                 if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC)
 335                         return true;
 336                 fallthrough;
 337         default:
 338                 return false;
 339         }
 340 }
 341
 342 /*---------------------------------- VLAN -----------------------------------*/
 343
 344 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 345  * We don't protect the slave list iteration with a lock because:
 346  * a. This operation is performed in IOCTL context,
 347  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 348  * c. Holding a lock with BH disabled while directly calling a base driver
 349  *    entry point is generally a BAD idea.
 350  *
 351  * The design of synchronization/protection for this operation in the 8021q
 352  * module is good for one or more VLAN devices over a single physical device
 353  * and cannot be extended for a teaming solution like bonding, so there is a
 354  * potential race condition here where a net device from the vlan group might
 355  * be referenced (either by a base driver or the 8021q code) while it is being
 356  * removed from the system. However, it turns out we're not making matters
 357  * worse, and if it works for regular VLAN usage it will work here too.
 358 */
 359
 360 /**
 361  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 362  * @bond_dev: bonding net device that got called
 363  * @proto: network protocol ID
 364  * @vid: vlan id being added
 365  */
 366 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 367                                 __be16 proto, u16 vid)
 368 {
 369         struct bonding *bond = netdev_priv(bond_dev);
 370         struct slave *slave, *rollback_slave;
 371         struct list_head *iter;
 372         int res;
 373
 374         bond_for_each_slave(bond, slave, iter) {
 375                 res = vlan_vid_add(slave->dev, proto, vid);
 376                 if (res)
 377                         goto unwind;
 378         }
 379
 380         return 0;
 381
 382 unwind:
 383         /* unwind to the slave that failed */
 384         bond_for_each_slave(bond, rollback_slave, iter) {
 385                 if (rollback_slave == slave)
 386                         break;
 387
 388                 vlan_vid_del(rollback_slave->dev, proto, vid);
 389         }
 390
 391         return res;
 392 }
 393
 394 /**
 395  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 396  * @bond_dev: bonding net device that got called
 397  * @proto: network protocol ID
 398  * @vid: vlan id being removed
 399  */
 400 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 401                                  __be16 proto, u16 vid)
 402 {
 403         struct bonding *bond = netdev_priv(bond_dev);
 404         struct list_head *iter;
 405         struct slave *slave;
 406
 407         bond_for_each_slave(bond, slave, iter)
 408                 vlan_vid_del(slave->dev, proto, vid);
 409
 410         if (bond_is_lb(bond))
 411                 bond_alb_clear_vlan(bond, vid);
 412
 413         return 0;
 414 }
 415
 416 /*---------------------------------- XFRM -----------------------------------*/
 417
 418 #ifdef CONFIG_XFRM_OFFLOAD
 419 /**
 420  * bond_ipsec_add_sa - program device with a security association
 421  * @xs: pointer to transformer state struct
 422  **/
 423 static int bond_ipsec_add_sa(struct xfrm_state *xs)
 424 {
 425         struct net_device *bond_dev = xs->xso.dev;
 426         struct bond_ipsec *ipsec;
 427         struct bonding *bond;
 428         struct slave *slave;
 429         int err;
 430
 431         if (!bond_dev)
 432                 return -EINVAL;
 433
 434         rcu_read_lock();
 435         bond = netdev_priv(bond_dev);
 436         slave = rcu_dereference(bond->curr_active_slave);
 437         if (!slave) {
 438                 rcu_read_unlock();
 439                 return -ENODEV;
 440         }
 441
 442         if (!slave->dev->xfrmdev_ops ||
 443             !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
 444             netif_is_bond_master(slave->dev)) {
 445                 slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n");
 446                 rcu_read_unlock();
 447                 return -EINVAL;
 448         }
 449
 450         ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC);
 451         if (!ipsec) {
 452                 rcu_read_unlock();
 453                 return -ENOMEM;
 454         }
 455         xs->xso.real_dev = slave->dev;
 456
 457         err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs);
 458         if (!err) {
 459                 ipsec->xs = xs;
 460                 INIT_LIST_HEAD(&ipsec->list);
 461                 spin_lock_bh(&bond->ipsec_lock);
 462                 list_add(&ipsec->list, &bond->ipsec_list);
 463                 spin_unlock_bh(&bond->ipsec_lock);
 464         } else {
 465                 kfree(ipsec);
 466         }
 467         rcu_read_unlock();
 468         return err;
 469 }
 470
 471 static void bond_ipsec_add_sa_all(struct bonding *bond)
 472 {
 473         struct net_device *bond_dev = bond->dev;
 474         struct bond_ipsec *ipsec;
 475         struct slave *slave;
 476
 477         rcu_read_lock();
 478         slave = rcu_dereference(bond->curr_active_slave);
 479         if (!slave)
 480                 goto out;
 481
 482         if (!slave->dev->xfrmdev_ops ||
 483             !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
 484             netif_is_bond_master(slave->dev)) {
 485                 spin_lock_bh(&bond->ipsec_lock);
 486                 if (!list_empty(&bond->ipsec_list))
 487                         slave_warn(bond_dev, slave->dev,
 488                                    "%s: no slave xdo_dev_state_add\n",
 489                                    __func__);
 490                 spin_unlock_bh(&bond->ipsec_lock);
 491                 goto out;
 492         }
 493
 494         spin_lock_bh(&bond->ipsec_lock);
 495         list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 496                 ipsec->xs->xso.real_dev = slave->dev;
 497                 if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs)) {
 498                         slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__);
 499                         ipsec->xs->xso.real_dev = NULL;
 500                 }
 501         }
 502         spin_unlock_bh(&bond->ipsec_lock);
 503 out:
 504         rcu_read_unlock();
 505 }
 506
 507 /**
 508  * bond_ipsec_del_sa - clear out this specific SA
 509  * @xs: pointer to transformer state struct
 510  **/
 511 static void bond_ipsec_del_sa(struct xfrm_state *xs)
 512 {
 513         struct net_device *bond_dev = xs->xso.dev;
 514         struct bond_ipsec *ipsec;
 515         struct bonding *bond;
 516         struct slave *slave;
 517
 518         if (!bond_dev)
 519                 return;
 520
 521         rcu_read_lock();
 522         bond = netdev_priv(bond_dev);
 523         slave = rcu_dereference(bond->curr_active_slave);
 524
 525         if (!slave)
 526                 goto out;
 527
 528         if (!xs->xso.real_dev)
 529                 goto out;
 530
 531         WARN_ON(xs->xso.real_dev != slave->dev);
 532
 533         if (!slave->dev->xfrmdev_ops ||
 534             !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
 535             netif_is_bond_master(slave->dev)) {
 536                 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
 537                 goto out;
 538         }
 539
 540         slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
 541 out:
 542         spin_lock_bh(&bond->ipsec_lock);
 543         list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 544                 if (ipsec->xs == xs) {
 545                         list_del(&ipsec->list);
 546                         kfree(ipsec);
 547                         break;
 548                 }
 549         }
 550         spin_unlock_bh(&bond->ipsec_lock);
 551         rcu_read_unlock();
 552 }
 553
 554 static void bond_ipsec_del_sa_all(struct bonding *bond)
 555 {
 556         struct net_device *bond_dev = bond->dev;
 557         struct bond_ipsec *ipsec;
 558         struct slave *slave;
 559
 560         rcu_read_lock();
 561         slave = rcu_dereference(bond->curr_active_slave);
 562         if (!slave) {
 563                 rcu_read_unlock();
 564                 return;
 565         }
 566
 567         spin_lock_bh(&bond->ipsec_lock);
 568         list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 569                 if (!ipsec->xs->xso.real_dev)
 570                         continue;
 571
 572                 if (!slave->dev->xfrmdev_ops ||
 573                     !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
 574                     netif_is_bond_master(slave->dev)) {
 575                         slave_warn(bond_dev, slave->dev,
 576                                    "%s: no slave xdo_dev_state_delete\n",
 577                                    __func__);
 578                 } else {
 579                         slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs);
 580                 }
 581                 ipsec->xs->xso.real_dev = NULL;
 582         }
 583         spin_unlock_bh(&bond->ipsec_lock);
 584         rcu_read_unlock();
 585 }
 586
 587 /**
 588  * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
 589  * @skb: current data packet
 590  * @xs: pointer to transformer state struct
 591  **/
 592 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 593 {
 594         struct net_device *bond_dev = xs->xso.dev;
 595         struct net_device *real_dev;
 596         struct slave *curr_active;
 597         struct bonding *bond;
 598         int err;
 599
 600         bond = netdev_priv(bond_dev);
 601         rcu_read_lock();
 602         curr_active = rcu_dereference(bond->curr_active_slave);
 603         real_dev = curr_active->dev;
 604
 605         if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
 606                 err = false;
 607                 goto out;
 608         }
 609
 610         if (!xs->xso.real_dev) {
 611                 err = false;
 612                 goto out;
 613         }
 614
 615         if (!real_dev->xfrmdev_ops ||
 616             !real_dev->xfrmdev_ops->xdo_dev_offload_ok ||
 617             netif_is_bond_master(real_dev)) {
 618                 err = false;
 619                 goto out;
 620         }
 621
 622         err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
 623 out:
 624         rcu_read_unlock();
 625         return err;
 626 }
 627
 628 static const struct xfrmdev_ops bond_xfrmdev_ops = {
 629         .xdo_dev_state_add = bond_ipsec_add_sa,
 630         .xdo_dev_state_delete = bond_ipsec_del_sa,
 631         .xdo_dev_offload_ok = bond_ipsec_offload_ok,
 632 };
 633 #endif /* CONFIG_XFRM_OFFLOAD */
 634
 635 /*------------------------------- Link status -------------------------------*/
 636
 637 /* Set the carrier state for the master according to the state of its
 638  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 639  * do special 802.3ad magic.
 640  *
 641  * Returns zero if carrier state does not change, nonzero if it does.
 642  */
 643 int bond_set_carrier(struct bonding *bond)
 644 {
 645         struct list_head *iter;
 646         struct slave *slave;
 647
 648         if (!bond_has_slaves(bond))
 649                 goto down;
 650
 651         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 652                 return bond_3ad_set_carrier(bond);
 653
 654         bond_for_each_slave(bond, slave, iter) {
 655                 if (slave->link == BOND_LINK_UP) {
 656                         if (!netif_carrier_ok(bond->dev)) {
 657                                 netif_carrier_on(bond->dev);
 658                                 return 1;
 659                         }
 660                         return 0;
 661                 }
 662         }
 663
 664 down:
 665         if (netif_carrier_ok(bond->dev)) {
 666                 netif_carrier_off(bond->dev);
 667                 return 1;
 668         }
 669         return 0;
 670 }
 671
 672 /* Get link speed and duplex from the slave's base driver
 673  * using ethtool. If for some reason the call fails or the
 674  * values are invalid, set speed and duplex to -1,
 675  * and return. Return 1 if speed or duplex settings are
 676  * UNKNOWN; 0 otherwise.
 677  */
 678 static int bond_update_speed_duplex(struct slave *slave)
 679 {
 680         struct net_device *slave_dev = slave->dev;
 681         struct ethtool_link_ksettings ecmd;
 682         int res;
 683
 684         slave->speed = SPEED_UNKNOWN;
 685         slave->duplex = DUPLEX_UNKNOWN;
 686
 687         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 688         if (res < 0)
 689                 return 1;
 690         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 691                 return 1;
 692         switch (ecmd.base.duplex) {
 693         case DUPLEX_FULL:
 694         case DUPLEX_HALF:
 695                 break;
 696         default:
 697                 return 1;
 698         }
 699
 700         slave->speed = ecmd.base.speed;
 701         slave->duplex = ecmd.base.duplex;
 702
 703         return 0;
 704 }
 705
 706 const char *bond_slave_link_status(s8 link)
 707 {
 708         switch (link) {
 709         case BOND_LINK_UP:
 710                 return "up";
 711         case BOND_LINK_FAIL:
 712                 return "going down";
 713         case BOND_LINK_DOWN:
 714                 return "down";
 715         case BOND_LINK_BACK:
 716                 return "going back";
 717         default:
 718                 return "unknown";
 719         }
 720 }
 721
 722 /* if <dev> supports MII link status reporting, check its link status.
 723  *
 724  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 725  * depending upon the setting of the use_carrier parameter.
 726  *
 727  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 728  * can't tell and just pretend it is), or 0, meaning that the link is
 729  * down.
 730  *
 731  * If reporting is non-zero, instead of faking link up, return -1 if
 732  * both ETHTOOL and MII ioctls fail (meaning the device does not
 733  * support them).  If use_carrier is set, return whatever it says.
 734  * It'd be nice if there was a good way to tell if a driver supports
 735  * netif_carrier, but there really isn't.
 736  */
 737 static int bond_check_dev_link(struct bonding *bond,
 738                                struct net_device *slave_dev, int reporting)
 739 {
 740         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 741         int (*ioctl)(struct net_device *, struct ifreq *, int);
 742         struct ifreq ifr;
 743         struct mii_ioctl_data *mii;
 744
 745         if (!reporting && !netif_running(slave_dev))
 746                 return 0;
 747
 748         if (bond->params.use_carrier)
 749                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 750
 751         /* Try to get link status using Ethtool first. */
 752         if (slave_dev->ethtool_ops->get_link)
 753                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 754                         BMSR_LSTATUS : 0;
 755
 756         /* Ethtool can't be used, fallback to MII ioctls. */
 757         ioctl = slave_ops->ndo_eth_ioctl;
 758         if (ioctl) {
 759                 /* TODO: set pointer to correct ioctl on a per team member
 760                  *       bases to make this more efficient. that is, once
 761                  *       we determine the correct ioctl, we will always
 762                  *       call it and not the others for that team
 763                  *       member.
 764                  */
 765
 766                 /* We cannot assume that SIOCGMIIPHY will also read a
 767                  * register; not all network drivers (e.g., e100)
 768                  * support that.
 769                  */
 770
 771                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 772                 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 773                 mii = if_mii(&ifr);
 774                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 775                         mii->reg_num = MII_BMSR;
 776                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 777                                 return mii->val_out & BMSR_LSTATUS;
 778                 }
 779         }
 780
 781         /* If reporting, report that either there's no ndo_eth_ioctl,
 782          * or both SIOCGMIIREG and get_link failed (meaning that we
 783          * cannot report link status).  If not reporting, pretend
 784          * we're ok.
 785          */
 786         return reporting ? -1 : BMSR_LSTATUS;
 787 }
 788
 789 /*----------------------------- Multicast list ------------------------------*/
 790
 791 /* Push the promiscuity flag down to appropriate slaves */
 792 static int bond_set_promiscuity(struct bonding *bond, int inc)
 793 {
 794         struct list_head *iter;
 795         int err = 0;
 796
 797         if (bond_uses_primary(bond)) {
 798                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 799
 800                 if (curr_active)
 801                         err = dev_set_promiscuity(curr_active->dev, inc);
 802         } else {
 803                 struct slave *slave;
 804
 805                 bond_for_each_slave(bond, slave, iter) {
 806                         err = dev_set_promiscuity(slave->dev, inc);
 807                         if (err)
 808                                 return err;
 809                 }
 810         }
 811         return err;
 812 }
 813
 814 /* Push the allmulti flag down to all slaves */
 815 static int bond_set_allmulti(struct bonding *bond, int inc)
 816 {
 817         struct list_head *iter;
 818         int err = 0;
 819
 820         if (bond_uses_primary(bond)) {
 821                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 822
 823                 if (curr_active)
 824                         err = dev_set_allmulti(curr_active->dev, inc);
 825         } else {
 826                 struct slave *slave;
 827
 828                 bond_for_each_slave(bond, slave, iter) {
 829                         err = dev_set_allmulti(slave->dev, inc);
 830                         if (err)
 831                                 return err;
 832                 }
 833         }
 834         return err;
 835 }
 836
 837 /* Retrieve the list of registered multicast addresses for the bonding
 838  * device and retransmit an IGMP JOIN request to the current active
 839  * slave.
 840  */
 841 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 842 {
 843         struct bonding *bond = container_of(work, struct bonding,
 844                                             mcast_work.work);
 845
 846         if (!rtnl_trylock()) {
 847                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 848                 return;
 849         }
 850         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 851
 852         if (bond->igmp_retrans > 1) {
 853                 bond->igmp_retrans--;
 854                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 855         }
 856         rtnl_unlock();
 857 }
 858
 859 /* Flush bond's hardware addresses from slave */
 860 static void bond_hw_addr_flush(struct net_device *bond_dev,
 861                                struct net_device *slave_dev)
 862 {
 863         struct bonding *bond = netdev_priv(bond_dev);
 864
 865         dev_uc_unsync(slave_dev, bond_dev);
 866         dev_mc_unsync(slave_dev, bond_dev);
 867
 868         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 869                 dev_mc_del(slave_dev, lacpdu_mcast_addr);
 870 }
 871
 872 /*--------------------------- Active slave change ---------------------------*/
 873
 874 /* Update the hardware address list and promisc/allmulti for the new and
 875  * old active slaves (if any).  Modes that are not using primary keep all
 876  * slaves up date at all times; only the modes that use primary need to call
 877  * this function to swap these settings during a failover.
 878  */
 879 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 880                               struct slave *old_active)
 881 {
 882         if (old_active) {
 883                 if (bond->dev->flags & IFF_PROMISC)
 884                         dev_set_promiscuity(old_active->dev, -1);
 885
 886                 if (bond->dev->flags & IFF_ALLMULTI)
 887                         dev_set_allmulti(old_active->dev, -1);
 888
 889                 if (bond->dev->flags & IFF_UP)
 890                         bond_hw_addr_flush(bond->dev, old_active->dev);
 891         }
 892
 893         if (new_active) {
 894                 /* FIXME: Signal errors upstream. */
 895                 if (bond->dev->flags & IFF_PROMISC)
 896                         dev_set_promiscuity(new_active->dev, 1);
 897
 898                 if (bond->dev->flags & IFF_ALLMULTI)
 899                         dev_set_allmulti(new_active->dev, 1);
 900
 901                 if (bond->dev->flags & IFF_UP) {
 902                         netif_addr_lock_bh(bond->dev);
 903                         dev_uc_sync(new_active->dev, bond->dev);
 904                         dev_mc_sync(new_active->dev, bond->dev);
 905                         netif_addr_unlock_bh(bond->dev);
 906                 }
 907         }
 908 }
 909
 910 /**
 911  * bond_set_dev_addr - clone slave's address to bond
 912  * @bond_dev: bond net device
 913  * @slave_dev: slave net device
 914  *
 915  * Should be called with RTNL held.
 916  */
 917 static int bond_set_dev_addr(struct net_device *bond_dev,
 918                              struct net_device *slave_dev)
 919 {
 920         int err;
 921
 922         slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 923                   bond_dev, slave_dev, slave_dev->addr_len);
 924         err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 925         if (err)
 926                 return err;
 927
 928         __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len);
 929         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 930         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 931         return 0;
 932 }
 933
 934 static struct slave *bond_get_old_active(struct bonding *bond,
 935                                          struct slave *new_active)
 936 {
 937         struct slave *slave;
 938         struct list_head *iter;
 939
 940         bond_for_each_slave(bond, slave, iter) {
 941                 if (slave == new_active)
 942                         continue;
 943
 944                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 945                         return slave;
 946         }
 947
 948         return NULL;
 949 }
 950
 951 /* bond_do_fail_over_mac
 952  *
 953  * Perform special MAC address swapping for fail_over_mac settings
 954  *
 955  * Called with RTNL
 956  */
 957 static void bond_do_fail_over_mac(struct bonding *bond,
 958                                   struct slave *new_active,
 959                                   struct slave *old_active)
 960 {
 961         u8 tmp_mac[MAX_ADDR_LEN];
 962         struct sockaddr_storage ss;
 963         int rv;
 964
 965         switch (bond->params.fail_over_mac) {
 966         case BOND_FOM_ACTIVE:
 967                 if (new_active) {
 968                         rv = bond_set_dev_addr(bond->dev, new_active->dev);
 969                         if (rv)
 970                                 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
 971                                           -rv);
 972                 }
 973                 break;
 974         case BOND_FOM_FOLLOW:
 975                 /* if new_active && old_active, swap them
 976                  * if just old_active, do nothing (going to no active slave)
 977                  * if just new_active, set new_active to bond's MAC
 978                  */
 979                 if (!new_active)
 980                         return;
 981
 982                 if (!old_active)
 983                         old_active = bond_get_old_active(bond, new_active);
 984
 985                 if (old_active) {
 986                         bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 987                                           new_active->dev->addr_len);
 988                         bond_hw_addr_copy(ss.__data,
 989                                           old_active->dev->dev_addr,
 990                                           old_active->dev->addr_len);
 991                         ss.ss_family = new_active->dev->type;
 992                 } else {
 993                         bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 994                                           bond->dev->addr_len);
 995                         ss.ss_family = bond->dev->type;
 996                 }
 997
 998                 rv = dev_set_mac_address(new_active->dev,
 999                                          (struct sockaddr *)&ss, NULL);
1000                 if (rv) {
1001                         slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
1002                                   -rv);
1003                         goto out;
1004                 }
1005
1006                 if (!old_active)
1007                         goto out;
1008
1009                 bond_hw_addr_copy(ss.__data, tmp_mac,
1010                                   new_active->dev->addr_len);
1011                 ss.ss_family = old_active->dev->type;
1012
1013                 rv = dev_set_mac_address(old_active->dev,
1014                                          (struct sockaddr *)&ss, NULL);
1015                 if (rv)
1016                         slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
1017                                   -rv);
1018 out:
1019                 break;
1020         default:
1021                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
1022                            bond->params.fail_over_mac);
1023                 break;
1024         }
1025
1026 }
1027
1028 /**
1029  * bond_choose_primary_or_current - select the primary or high priority slave
1030  * @bond: our bonding struct
1031  *
1032  * - Check if there is a primary link. If the primary link was set and is up,
1033  *   go on and do link reselection.
1034  *
1035  * - If primary link is not set or down, find the highest priority link.
1036  *   If the highest priority link is not current slave, set it as primary
1037  *   link and do link reselection.
1038  */
1039 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
1040 {
1041         struct slave *prim = rtnl_dereference(bond->primary_slave);
1042         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
1043         struct slave *slave, *hprio = NULL;
1044         struct list_head *iter;
1045
1046         if (!prim || prim->link != BOND_LINK_UP) {
1047                 bond_for_each_slave(bond, slave, iter) {
1048                         if (slave->link == BOND_LINK_UP) {
1049                                 hprio = hprio ?: slave;
1050                                 if (slave->prio > hprio->prio)
1051                                         hprio = slave;
1052                         }
1053                 }
1054
1055                 if (hprio && hprio != curr) {
1056                         prim = hprio;
1057                         goto link_reselect;
1058                 }
1059
1060                 if (!curr || curr->link != BOND_LINK_UP)
1061                         return NULL;
1062                 return curr;
1063         }
1064
1065         if (bond->force_primary) {
1066                 bond->force_primary = false;
1067                 return prim;
1068         }
1069
1070 link_reselect:
1071         if (!curr || curr->link != BOND_LINK_UP)
1072                 return prim;
1073
1074         /* At this point, prim and curr are both up */
1075         switch (bond->params.primary_reselect) {
1076         case BOND_PRI_RESELECT_ALWAYS:
1077                 return prim;
1078         case BOND_PRI_RESELECT_BETTER:
1079                 if (prim->speed < curr->speed)
1080                         return curr;
1081                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
1082                         return curr;
1083                 return prim;
1084         case BOND_PRI_RESELECT_FAILURE:
1085                 return curr;
1086         default:
1087                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
1088                            bond->params.primary_reselect);
1089                 return curr;
1090         }
1091 }
1092
1093 /**
1094  * bond_find_best_slave - select the best available slave to be the active one
1095  * @bond: our bonding struct
1096  */
1097 static struct slave *bond_find_best_slave(struct bonding *bond)
1098 {
1099         struct slave *slave, *bestslave = NULL;
1100         struct list_head *iter;
1101         int mintime = bond->params.updelay;
1102
1103         slave = bond_choose_primary_or_current(bond);
1104         if (slave)
1105                 return slave;
1106
1107         bond_for_each_slave(bond, slave, iter) {
1108                 if (slave->link == BOND_LINK_UP)
1109                         return slave;
1110                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
1111                     slave->delay < mintime) {
1112                         mintime = slave->delay;
1113                         bestslave = slave;
1114                 }
1115         }
1116
1117         return bestslave;
1118 }
1119
1120 static bool bond_should_notify_peers(struct bonding *bond)
1121 {
1122         struct slave *slave;
1123
1124         rcu_read_lock();
1125         slave = rcu_dereference(bond->curr_active_slave);
1126         rcu_read_unlock();
1127
1128         if (!slave || !bond->send_peer_notif ||
1129             bond->send_peer_notif %
1130             max(1, bond->params.peer_notif_delay) != 0 ||
1131             !netif_carrier_ok(bond->dev) ||
1132             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1133                 return false;
1134
1135         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
1136                    slave ? slave->dev->name : "NULL");
1137
1138         return true;
1139 }
1140
1141 /**
1142  * bond_change_active_slave - change the active slave into the specified one
1143  * @bond: our bonding struct
1144  * @new_active: the new slave to make the active one
1145  *
1146  * Set the new slave to the bond's settings and unset them on the old
1147  * curr_active_slave.
1148  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1149  *
1150  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1151  * because it is apparently the best available slave we have, even though its
1152  * updelay hasn't timed out yet.
1153  *
1154  * Caller must hold RTNL.
1155  */
1156 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1157 {
1158         struct slave *old_active;
1159
1160         ASSERT_RTNL();
1161
1162         old_active = rtnl_dereference(bond->curr_active_slave);
1163
1164         if (old_active == new_active)
1165                 return;
1166
1167 #ifdef CONFIG_XFRM_OFFLOAD
1168         bond_ipsec_del_sa_all(bond);
1169 #endif /* CONFIG_XFRM_OFFLOAD */
1170
1171         if (new_active) {
1172                 new_active->last_link_up = jiffies;
1173
1174                 if (new_active->link == BOND_LINK_BACK) {
1175                         if (bond_uses_primary(bond)) {
1176                                 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
1177                                            (bond->params.updelay - new_active->delay) * bond->params.miimon);
1178                         }
1179
1180                         new_active->delay = 0;
1181                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
1182                                                   BOND_SLAVE_NOTIFY_NOW);
1183
1184                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1185                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1186
1187                         if (bond_is_lb(bond))
1188                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1189                 } else {
1190                         if (bond_uses_primary(bond))
1191                                 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1192                 }
1193         }
1194
1195         if (bond_uses_primary(bond))
1196                 bond_hw_addr_swap(bond, new_active, old_active);
1197
1198         if (bond_is_lb(bond)) {
1199                 bond_alb_handle_active_change(bond, new_active);
1200                 if (old_active)
1201                         bond_set_slave_inactive_flags(old_active,
1202                                                       BOND_SLAVE_NOTIFY_NOW);
1203                 if (new_active)
1204                         bond_set_slave_active_flags(new_active,
1205                                                     BOND_SLAVE_NOTIFY_NOW);
1206         } else {
1207                 rcu_assign_pointer(bond->curr_active_slave, new_active);
1208         }
1209
1210         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1211                 if (old_active)
1212                         bond_set_slave_inactive_flags(old_active,
1213                                                       BOND_SLAVE_NOTIFY_NOW);
1214
1215                 if (new_active) {
1216                         bool should_notify_peers = false;
1217
1218                         bond_set_slave_active_flags(new_active,
1219                                                     BOND_SLAVE_NOTIFY_NOW);
1220
1221                         if (bond->params.fail_over_mac)
1222                                 bond_do_fail_over_mac(bond, new_active,
1223                                                       old_active);
1224
1225                         if (netif_running(bond->dev)) {
1226                                 bond->send_peer_notif =
1227                                         bond->params.num_peer_notif *
1228                                         max(1, bond->params.peer_notif_delay);
1229                                 should_notify_peers =
1230                                         bond_should_notify_peers(bond);
1231                         }
1232
1233                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1234                         if (should_notify_peers) {
1235                                 bond->send_peer_notif--;
1236                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1237                                                          bond->dev);
1238                         }
1239                 }
1240         }
1241
1242 #ifdef CONFIG_XFRM_OFFLOAD
1243         bond_ipsec_add_sa_all(bond);
1244 #endif /* CONFIG_XFRM_OFFLOAD */
1245
1246         /* resend IGMP joins since active slave has changed or
1247          * all were sent on curr_active_slave.
1248          * resend only if bond is brought up with the affected
1249          * bonding modes and the retransmission is enabled
1250          */
1251         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1252             ((bond_uses_primary(bond) && new_active) ||
1253              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1254                 bond->igmp_retrans = bond->params.resend_igmp;
1255                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1256         }
1257 }
1258
1259 /**
1260  * bond_select_active_slave - select a new active slave, if needed
1261  * @bond: our bonding struct
1262  *
1263  * This functions should be called when one of the following occurs:
1264  * - The old curr_active_slave has been released or lost its link.
1265  * - The primary_slave has got its link back.
1266  * - A slave has got its link back and there's no old curr_active_slave.
1267  *
1268  * Caller must hold RTNL.
1269  */
1270 void bond_select_active_slave(struct bonding *bond)
1271 {
1272         struct slave *best_slave;
1273         int rv;
1274
1275         ASSERT_RTNL();
1276
1277         best_slave = bond_find_best_slave(bond);
1278         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1279                 bond_change_active_slave(bond, best_slave);
1280                 rv = bond_set_carrier(bond);
1281                 if (!rv)
1282                         return;
1283
1284                 if (netif_carrier_ok(bond->dev))
1285                         netdev_info(bond->dev, "active interface up!\n");
1286                 else
1287                         netdev_info(bond->dev, "now running without any active interface!\n");
1288         }
1289 }
1290
1291 #ifdef CONFIG_NET_POLL_CONTROLLER
1292 static inline int slave_enable_netpoll(struct slave *slave)
1293 {
1294         struct netpoll *np;
1295         int err = 0;
1296
1297         np = kzalloc(sizeof(*np), GFP_KERNEL);
1298         err = -ENOMEM;
1299         if (!np)
1300                 goto out;
1301
1302         err = __netpoll_setup(np, slave->dev);
1303         if (err) {
1304                 kfree(np);
1305                 goto out;
1306         }
1307         slave->np = np;
1308 out:
1309         return err;
1310 }
1311 static inline void slave_disable_netpoll(struct slave *slave)
1312 {
1313         struct netpoll *np = slave->np;
1314
1315         if (!np)
1316                 return;
1317
1318         slave->np = NULL;
1319
1320         __netpoll_free(np);
1321 }
1322
1323 static void bond_poll_controller(struct net_device *bond_dev)
1324 {
1325         struct bonding *bond = netdev_priv(bond_dev);
1326         struct slave *slave = NULL;
1327         struct list_head *iter;
1328         struct ad_info ad_info;
1329
1330         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1331                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
1332                         return;
1333
1334         bond_for_each_slave_rcu(bond, slave, iter) {
1335                 if (!bond_slave_is_up(slave))
1336                         continue;
1337
1338                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1339                         struct aggregator *agg =
1340                             SLAVE_AD_INFO(slave)->port.aggregator;
1341
1342                         if (agg &&
1343                             agg->aggregator_identifier != ad_info.aggregator_id)
1344                                 continue;
1345                 }
1346
1347                 netpoll_poll_dev(slave->dev);
1348         }
1349 }
1350
1351 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1352 {
1353         struct bonding *bond = netdev_priv(bond_dev);
1354         struct list_head *iter;
1355         struct slave *slave;
1356
1357         bond_for_each_slave(bond, slave, iter)
1358                 if (bond_slave_is_up(slave))
1359                         slave_disable_netpoll(slave);
1360 }
1361
1362 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1363 {
1364         struct bonding *bond = netdev_priv(dev);
1365         struct list_head *iter;
1366         struct slave *slave;
1367         int err = 0;
1368
1369         bond_for_each_slave(bond, slave, iter) {
1370                 err = slave_enable_netpoll(slave);
1371                 if (err) {
1372                         bond_netpoll_cleanup(dev);
1373                         break;
1374                 }
1375         }
1376         return err;
1377 }
1378 #else
1379 static inline int slave_enable_netpoll(struct slave *slave)
1380 {
1381         return 0;
1382 }
1383 static inline void slave_disable_netpoll(struct slave *slave)
1384 {
1385 }
1386 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1387 {
1388 }
1389 #endif
1390
1391 /*---------------------------------- IOCTL ----------------------------------*/
1392
1393 static netdev_features_t bond_fix_features(struct net_device *dev,
1394                                            netdev_features_t features)
1395 {
1396         struct bonding *bond = netdev_priv(dev);
1397         struct list_head *iter;
1398         netdev_features_t mask;
1399         struct slave *slave;
1400
1401 #if IS_ENABLED(CONFIG_TLS_DEVICE)
1402         if (bond_sk_check(bond))
1403                 features |= BOND_TLS_FEATURES;
1404         else
1405                 features &= ~BOND_TLS_FEATURES;
1406 #endif
1407
1408         mask = features;
1409
1410         features &= ~NETIF_F_ONE_FOR_ALL;
1411         features |= NETIF_F_ALL_FOR_ALL;
1412
1413         bond_for_each_slave(bond, slave, iter) {
1414                 features = netdev_increment_features(features,
1415                                                      slave->dev->features,
1416                                                      mask);
1417         }
1418         features = netdev_add_tso_features(features, mask);
1419
1420         return features;
1421 }
1422
1423 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1424                                  NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \
1425                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1426
1427 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1428                                  NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE)
1429
1430 #define BOND_MPLS_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1431                                  NETIF_F_GSO_SOFTWARE)
1432
1433
1434 static void bond_compute_features(struct bonding *bond)
1435 {
1436         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1437                                         IFF_XMIT_DST_RELEASE_PERM;
1438         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1439         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1440 #ifdef CONFIG_XFRM_OFFLOAD
1441         netdev_features_t xfrm_features  = BOND_XFRM_FEATURES;
1442 #endif /* CONFIG_XFRM_OFFLOAD */
1443         netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1444         struct net_device *bond_dev = bond->dev;
1445         struct list_head *iter;
1446         struct slave *slave;
1447         unsigned short max_hard_header_len = ETH_HLEN;
1448         unsigned int tso_max_size = TSO_MAX_SIZE;
1449         u16 tso_max_segs = TSO_MAX_SEGS;
1450
1451         if (!bond_has_slaves(bond))
1452                 goto done;
1453         vlan_features &= NETIF_F_ALL_FOR_ALL;
1454         mpls_features &= NETIF_F_ALL_FOR_ALL;
1455
1456         bond_for_each_slave(bond, slave, iter) {
1457                 vlan_features = netdev_increment_features(vlan_features,
1458                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1459
1460                 enc_features = netdev_increment_features(enc_features,
1461                                                          slave->dev->hw_enc_features,
1462                                                          BOND_ENC_FEATURES);
1463
1464 #ifdef CONFIG_XFRM_OFFLOAD
1465                 xfrm_features = netdev_increment_features(xfrm_features,
1466                                                           slave->dev->hw_enc_features,
1467                                                           BOND_XFRM_FEATURES);
1468 #endif /* CONFIG_XFRM_OFFLOAD */
1469
1470                 mpls_features = netdev_increment_features(mpls_features,
1471                                                           slave->dev->mpls_features,
1472                                                           BOND_MPLS_FEATURES);
1473
1474                 dst_release_flag &= slave->dev->priv_flags;
1475                 if (slave->dev->hard_header_len > max_hard_header_len)
1476                         max_hard_header_len = slave->dev->hard_header_len;
1477
1478                 tso_max_size = min(tso_max_size, slave->dev->tso_max_size);
1479                 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs);
1480         }
1481         bond_dev->hard_header_len = max_hard_header_len;
1482
1483 done:
1484         bond_dev->vlan_features = vlan_features;
1485         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1486                                     NETIF_F_HW_VLAN_CTAG_TX |
1487                                     NETIF_F_HW_VLAN_STAG_TX;
1488 #ifdef CONFIG_XFRM_OFFLOAD
1489         bond_dev->hw_enc_features |= xfrm_features;
1490 #endif /* CONFIG_XFRM_OFFLOAD */
1491         bond_dev->mpls_features = mpls_features;
1492         netif_set_tso_max_segs(bond_dev, tso_max_segs);
1493         netif_set_tso_max_size(bond_dev, tso_max_size);
1494
1495         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1496         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1497             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1498                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1499
1500         netdev_change_features(bond_dev);
1501 }
1502
1503 static void bond_setup_by_slave(struct net_device *bond_dev,
1504                                 struct net_device *slave_dev)
1505 {
1506         bond_dev->header_ops        = slave_dev->header_ops;
1507
1508         bond_dev->type              = slave_dev->type;
1509         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1510         bond_dev->needed_headroom   = slave_dev->needed_headroom;
1511         bond_dev->addr_len          = slave_dev->addr_len;
1512
1513         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1514                 slave_dev->addr_len);
1515 }
1516
1517 /* On bonding slaves other than the currently active slave, suppress
1518  * duplicates except for alb non-mcast/bcast.
1519  */
1520 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1521                                             struct slave *slave,
1522                                             struct bonding *bond)
1523 {
1524         if (bond_is_slave_inactive(slave)) {
1525                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1526                     skb->pkt_type != PACKET_BROADCAST &&
1527                     skb->pkt_type != PACKET_MULTICAST)
1528                         return false;
1529                 return true;
1530         }
1531         return false;
1532 }
1533
1534 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1535 {
1536         struct sk_buff *skb = *pskb;
1537         struct slave *slave;
1538         struct bonding *bond;
1539         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1540                           struct slave *);
1541         int ret = RX_HANDLER_ANOTHER;
1542
1543         skb = skb_share_check(skb, GFP_ATOMIC);
1544         if (unlikely(!skb))
1545                 return RX_HANDLER_CONSUMED;
1546
1547         *pskb = skb;
1548
1549         slave = bond_slave_get_rcu(skb->dev);
1550         bond = slave->bond;
1551
1552         recv_probe = READ_ONCE(bond->recv_probe);
1553         if (recv_probe) {
1554                 ret = recv_probe(skb, bond, slave);
1555                 if (ret == RX_HANDLER_CONSUMED) {
1556                         consume_skb(skb);
1557                         return ret;
1558                 }
1559         }
1560
1561         /*
1562          * For packets determined by bond_should_deliver_exact_match() call to
1563          * be suppressed we want to make an exception for link-local packets.
1564          * This is necessary for e.g. LLDP daemons to be able to monitor
1565          * inactive slave links without being forced to bind to them
1566          * explicitly.
1567          *
1568          * At the same time, packets that are passed to the bonding master
1569          * (including link-local ones) can have their originating interface
1570          * determined via PACKET_ORIGDEV socket option.
1571          */
1572         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1573                 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1574                         return RX_HANDLER_PASS;
1575                 return RX_HANDLER_EXACT;
1576         }
1577
1578         skb->dev = bond->dev;
1579
1580         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1581             netif_is_bridge_port(bond->dev) &&
1582             skb->pkt_type == PACKET_HOST) {
1583
1584                 if (unlikely(skb_cow_head(skb,
1585                                           skb->data - skb_mac_header(skb)))) {
1586                         kfree_skb(skb);
1587                         return RX_HANDLER_CONSUMED;
1588                 }
1589                 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1590                                   bond->dev->addr_len);
1591         }
1592
1593         return ret;
1594 }
1595
1596 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1597 {
1598         switch (BOND_MODE(bond)) {
1599         case BOND_MODE_ROUNDROBIN:
1600                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1601         case BOND_MODE_ACTIVEBACKUP:
1602                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1603         case BOND_MODE_BROADCAST:
1604                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1605         case BOND_MODE_XOR:
1606         case BOND_MODE_8023AD:
1607                 return NETDEV_LAG_TX_TYPE_HASH;
1608         default:
1609                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1610         }
1611 }
1612
1613 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1614                                                enum netdev_lag_tx_type type)
1615 {
1616         if (type != NETDEV_LAG_TX_TYPE_HASH)
1617                 return NETDEV_LAG_HASH_NONE;
1618
1619         switch (bond->params.xmit_policy) {
1620         case BOND_XMIT_POLICY_LAYER2:
1621                 return NETDEV_LAG_HASH_L2;
1622         case BOND_XMIT_POLICY_LAYER34:
1623                 return NETDEV_LAG_HASH_L34;
1624         case BOND_XMIT_POLICY_LAYER23:
1625                 return NETDEV_LAG_HASH_L23;
1626         case BOND_XMIT_POLICY_ENCAP23:
1627                 return NETDEV_LAG_HASH_E23;
1628         case BOND_XMIT_POLICY_ENCAP34:
1629                 return NETDEV_LAG_HASH_E34;
1630         case BOND_XMIT_POLICY_VLAN_SRCMAC:
1631                 return NETDEV_LAG_HASH_VLAN_SRCMAC;
1632         default:
1633                 return NETDEV_LAG_HASH_UNKNOWN;
1634         }
1635 }
1636
1637 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1638                                       struct netlink_ext_ack *extack)
1639 {
1640         struct netdev_lag_upper_info lag_upper_info;
1641         enum netdev_lag_tx_type type;
1642
1643         type = bond_lag_tx_type(bond);
1644         lag_upper_info.tx_type = type;
1645         lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1646
1647         return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1648                                             &lag_upper_info, extack);
1649 }
1650
1651 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1652 {
1653         netdev_upper_dev_unlink(slave->dev, bond->dev);
1654         slave->dev->flags &= ~IFF_SLAVE;
1655 }
1656
1657 static void slave_kobj_release(struct kobject *kobj)
1658 {
1659         struct slave *slave = to_slave(kobj);
1660         struct bonding *bond = bond_get_bond_by_slave(slave);
1661
1662         cancel_delayed_work_sync(&slave->notify_work);
1663         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1664                 kfree(SLAVE_AD_INFO(slave));
1665
1666         kfree(slave);
1667 }
1668
1669 static struct kobj_type slave_ktype = {
1670         .release = slave_kobj_release,
1671 #ifdef CONFIG_SYSFS
1672         .sysfs_ops = &slave_sysfs_ops,
1673 #endif
1674 };
1675
1676 static int bond_kobj_init(struct slave *slave)
1677 {
1678         int err;
1679
1680         err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1681                                    &(slave->dev->dev.kobj), "bonding_slave");
1682         if (err)
1683                 kobject_put(&slave->kobj);
1684
1685         return err;
1686 }
1687
1688 static struct slave *bond_alloc_slave(struct bonding *bond,
1689                                       struct net_device *slave_dev)
1690 {
1691         struct slave *slave = NULL;
1692
1693         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1694         if (!slave)
1695                 return NULL;
1696
1697         slave->bond = bond;
1698         slave->dev = slave_dev;
1699         INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1700
1701         if (bond_kobj_init(slave))
1702                 return NULL;
1703
1704         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1705                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1706                                                GFP_KERNEL);
1707                 if (!SLAVE_AD_INFO(slave)) {
1708                         kobject_put(&slave->kobj);
1709                         return NULL;
1710                 }
1711         }
1712
1713         return slave;
1714 }
1715
1716 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1717 {
1718         info->bond_mode = BOND_MODE(bond);
1719         info->miimon = bond->params.miimon;
1720         info->num_slaves = bond->slave_cnt;
1721 }
1722
1723 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1724 {
1725         strcpy(info->slave_name, slave->dev->name);
1726         info->link = slave->link;
1727         info->state = bond_slave_state(slave);
1728         info->link_failure_count = slave->link_failure_count;
1729 }
1730
1731 static void bond_netdev_notify_work(struct work_struct *_work)
1732 {
1733         struct slave *slave = container_of(_work, struct slave,
1734                                            notify_work.work);
1735
1736         if (rtnl_trylock()) {
1737                 struct netdev_bonding_info binfo;
1738
1739                 bond_fill_ifslave(slave, &binfo.slave);
1740                 bond_fill_ifbond(slave->bond, &binfo.master);
1741                 netdev_bonding_info_change(slave->dev, &binfo);
1742                 rtnl_unlock();
1743         } else {
1744                 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1745         }
1746 }
1747
1748 void bond_queue_slave_event(struct slave *slave)
1749 {
1750         queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1751 }
1752
1753 void bond_lower_state_changed(struct slave *slave)
1754 {
1755         struct netdev_lag_lower_state_info info;
1756
1757         info.link_up = slave->link == BOND_LINK_UP ||
1758                        slave->link == BOND_LINK_FAIL;
1759         info.tx_enabled = bond_is_active_slave(slave);
1760         netdev_lower_state_changed(slave->dev, &info);
1761 }
1762
1763 #define BOND_NL_ERR(bond_dev, extack, errmsg) do {              \
1764         if (extack)                                             \
1765                 NL_SET_ERR_MSG(extack, errmsg);                 \
1766         else                                                    \
1767                 netdev_err(bond_dev, "Error: %s\n", errmsg);    \
1768 } while (0)
1769
1770 #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do {          \
1771         if (extack)                                                     \
1772                 NL_SET_ERR_MSG(extack, errmsg);                         \
1773         else                                                            \
1774                 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg);  \
1775 } while (0)
1776
1777 /* enslave device <slave> to bond device <master> */
1778 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1779                  struct netlink_ext_ack *extack)
1780 {
1781         struct bonding *bond = netdev_priv(bond_dev);
1782         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1783         struct slave *new_slave = NULL, *prev_slave;
1784         struct sockaddr_storage ss;
1785         int link_reporting;
1786         int res = 0, i;
1787
1788         if (slave_dev->flags & IFF_MASTER &&
1789             !netif_is_bond_master(slave_dev)) {
1790                 BOND_NL_ERR(bond_dev, extack,
1791                             "Device type (master device) cannot be enslaved");
1792                 return -EPERM;
1793         }
1794
1795         if (!bond->params.use_carrier &&
1796             slave_dev->ethtool_ops->get_link == NULL &&
1797             slave_ops->ndo_eth_ioctl == NULL) {
1798                 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1799         }
1800
1801         /* already in-use? */
1802         if (netdev_is_rx_handler_busy(slave_dev)) {
1803                 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1804                              "Device is in use and cannot be enslaved");
1805                 return -EBUSY;
1806         }
1807
1808         if (bond_dev == slave_dev) {
1809                 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself.");
1810                 return -EPERM;
1811         }
1812
1813         /* vlan challenged mutual exclusion */
1814         /* no need to lock since we're protected by rtnl_lock */
1815         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1816                 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1817                 if (vlan_uses_dev(bond_dev)) {
1818                         SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1819                                      "Can not enslave VLAN challenged device to VLAN enabled bond");
1820                         return -EPERM;
1821                 } else {
1822                         slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1823                 }
1824         } else {
1825                 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1826         }
1827
1828         if (slave_dev->features & NETIF_F_HW_ESP)
1829                 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1830
1831         /* Old ifenslave binaries are no longer supported.  These can
1832          * be identified with moderate accuracy by the state of the slave:
1833          * the current ifenslave will set the interface down prior to
1834          * enslaving it; the old ifenslave will not.
1835          */
1836         if (slave_dev->flags & IFF_UP) {
1837                 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1838                              "Device can not be enslaved while up");
1839                 return -EPERM;
1840         }
1841
1842         /* set bonding device ether type by slave - bonding netdevices are
1843          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1844          * there is a need to override some of the type dependent attribs/funcs.
1845          *
1846          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1847          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1848          */
1849         if (!bond_has_slaves(bond)) {
1850                 if (bond_dev->type != slave_dev->type) {
1851                         slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1852                                   bond_dev->type, slave_dev->type);
1853
1854                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1855                                                        bond_dev);
1856                         res = notifier_to_errno(res);
1857                         if (res) {
1858                                 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1859                                 return -EBUSY;
1860                         }
1861
1862                         /* Flush unicast and multicast addresses */
1863                         dev_uc_flush(bond_dev);
1864                         dev_mc_flush(bond_dev);
1865
1866                         if (slave_dev->type != ARPHRD_ETHER)
1867                                 bond_setup_by_slave(bond_dev, slave_dev);
1868                         else {
1869                                 ether_setup(bond_dev);
1870                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1871                         }
1872
1873                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1874                                                  bond_dev);
1875                 }
1876         } else if (bond_dev->type != slave_dev->type) {
1877                 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1878                              "Device type is different from other slaves");
1879                 return -EINVAL;
1880         }
1881
1882         if (slave_dev->type == ARPHRD_INFINIBAND &&
1883             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1884                 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1885                              "Only active-backup mode is supported for infiniband slaves");
1886                 res = -EOPNOTSUPP;
1887                 goto err_undo_flags;
1888         }
1889
1890         if (!slave_ops->ndo_set_mac_address ||
1891             slave_dev->type == ARPHRD_INFINIBAND) {
1892                 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1893                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1894                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1895                         if (!bond_has_slaves(bond)) {
1896                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1897                                 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1898                         } else {
1899                                 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1900                                              "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1901                                 res = -EOPNOTSUPP;
1902                                 goto err_undo_flags;
1903                         }
1904                 }
1905         }
1906
1907         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1908
1909         /* If this is the first slave, then we need to set the master's hardware
1910          * address to be the same as the slave's.
1911          */
1912         if (!bond_has_slaves(bond) &&
1913             bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1914                 res = bond_set_dev_addr(bond->dev, slave_dev);
1915                 if (res)
1916                         goto err_undo_flags;
1917         }
1918
1919         new_slave = bond_alloc_slave(bond, slave_dev);
1920         if (!new_slave) {
1921                 res = -ENOMEM;
1922                 goto err_undo_flags;
1923         }
1924
1925         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1926          * is set via sysfs or module option if desired.
1927          */
1928         new_slave->queue_id = 0;
1929
1930         /* Save slave's original mtu and then set it to match the bond */
1931         new_slave->original_mtu = slave_dev->mtu;
1932         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1933         if (res) {
1934                 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1935                 goto err_free;
1936         }
1937
1938         /* Save slave's original ("permanent") mac address for modes
1939          * that need it, and for restoring it upon release, and then
1940          * set it to the master's address
1941          */
1942         bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1943                           slave_dev->addr_len);
1944
1945         if (!bond->params.fail_over_mac ||
1946             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1947                 /* Set slave to master's mac address.  The application already
1948                  * set the master's mac address to that of the first slave
1949                  */
1950                 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1951                 ss.ss_family = slave_dev->type;
1952                 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1953                                           extack);
1954                 if (res) {
1955                         slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1956                         goto err_restore_mtu;
1957                 }
1958         }
1959
1960         /* set slave flag before open to prevent IPv6 addrconf */
1961         slave_dev->flags |= IFF_SLAVE;
1962
1963         /* open the slave since the application closed it */
1964         res = dev_open(slave_dev, extack);
1965         if (res) {
1966                 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1967                 goto err_restore_mac;
1968         }
1969
1970         slave_dev->priv_flags |= IFF_BONDING;
1971         /* initialize slave stats */
1972         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1973
1974         if (bond_is_lb(bond)) {
1975                 /* bond_alb_init_slave() must be called before all other stages since
1976                  * it might fail and we do not want to have to undo everything
1977                  */
1978                 res = bond_alb_init_slave(bond, new_slave);
1979                 if (res)
1980                         goto err_close;
1981         }
1982
1983         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1984         if (res) {
1985                 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1986                 goto err_close;
1987         }
1988
1989         prev_slave = bond_last_slave(bond);
1990
1991         new_slave->delay = 0;
1992         new_slave->link_failure_count = 0;
1993
1994         if (bond_update_speed_duplex(new_slave) &&
1995             bond_needs_speed_duplex(bond))
1996                 new_slave->link = BOND_LINK_DOWN;
1997
1998         new_slave->last_rx = jiffies -
1999                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
2000         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
2001                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
2002
2003         new_slave->last_tx = new_slave->last_rx;
2004
2005         if (bond->params.miimon && !bond->params.use_carrier) {
2006                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
2007
2008                 if ((link_reporting == -1) && !bond->params.arp_interval) {
2009                         /* miimon is set but a bonded network driver
2010                          * does not support ETHTOOL/MII and
2011                          * arp_interval is not set.  Note: if
2012                          * use_carrier is enabled, we will never go
2013                          * here (because netif_carrier is always
2014                          * supported); thus, we don't need to change
2015                          * the messages for netif_carrier.
2016                          */
2017                         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");
2018                 } else if (link_reporting == -1) {
2019                         /* unable get link status using mii/ethtool */
2020                         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");
2021                 }
2022         }
2023
2024         /* check for initial state */
2025         new_slave->link = BOND_LINK_NOCHANGE;
2026         if (bond->params.miimon) {
2027                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
2028                         if (bond->params.updelay) {
2029                                 bond_set_slave_link_state(new_slave,
2030                                                           BOND_LINK_BACK,
2031                                                           BOND_SLAVE_NOTIFY_NOW);
2032                                 new_slave->delay = bond->params.updelay;
2033                         } else {
2034                                 bond_set_slave_link_state(new_slave,
2035                                                           BOND_LINK_UP,
2036                                                           BOND_SLAVE_NOTIFY_NOW);
2037                         }
2038                 } else {
2039                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
2040                                                   BOND_SLAVE_NOTIFY_NOW);
2041                 }
2042         } else if (bond->params.arp_interval) {
2043                 bond_set_slave_link_state(new_slave,
2044                                           (netif_carrier_ok(slave_dev) ?
2045                                           BOND_LINK_UP : BOND_LINK_DOWN),
2046                                           BOND_SLAVE_NOTIFY_NOW);
2047         } else {
2048                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
2049                                           BOND_SLAVE_NOTIFY_NOW);
2050         }
2051
2052         if (new_slave->link != BOND_LINK_DOWN)
2053                 new_slave->last_link_up = jiffies;
2054         slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
2055                   new_slave->link == BOND_LINK_DOWN ? "DOWN" :
2056                   (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
2057
2058         if (bond_uses_primary(bond) && bond->params.primary[0]) {
2059                 /* if there is a primary slave, remember it */
2060                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
2061                         rcu_assign_pointer(bond->primary_slave, new_slave);
2062                         bond->force_primary = true;
2063                 }
2064         }
2065
2066         switch (BOND_MODE(bond)) {
2067         case BOND_MODE_ACTIVEBACKUP:
2068                 bond_set_slave_inactive_flags(new_slave,
2069                                               BOND_SLAVE_NOTIFY_NOW);
2070                 break;
2071         case BOND_MODE_8023AD:
2072                 /* in 802.3ad mode, the internal mechanism
2073                  * will activate the slaves in the selected
2074                  * aggregator
2075                  */
2076                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
2077                 /* if this is the first slave */
2078                 if (!prev_slave) {
2079                         SLAVE_AD_INFO(new_slave)->id = 1;
2080                         /* Initialize AD with the number of times that the AD timer is called in 1 second
2081                          * can be called only after the mac address of the bond is set
2082                          */
2083                         bond_3ad_initialize(bond);
2084                 } else {
2085                         SLAVE_AD_INFO(new_slave)->id =
2086                                 SLAVE_AD_INFO(prev_slave)->id + 1;
2087                 }
2088
2089                 bond_3ad_bind_slave(new_slave);
2090                 break;
2091         case BOND_MODE_TLB:
2092         case BOND_MODE_ALB:
2093                 bond_set_active_slave(new_slave);
2094                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
2095                 break;
2096         default:
2097                 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
2098
2099                 /* always active in trunk mode */
2100                 bond_set_active_slave(new_slave);
2101
2102                 /* In trunking mode there is little meaning to curr_active_slave
2103                  * anyway (it holds no special properties of the bond device),
2104                  * so we can change it without calling change_active_interface()
2105                  */
2106                 if (!rcu_access_pointer(bond->curr_active_slave) &&
2107                     new_slave->link == BOND_LINK_UP)
2108                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
2109
2110                 break;
2111         } /* switch(bond_mode) */
2112
2113 #ifdef CONFIG_NET_POLL_CONTROLLER
2114         if (bond->dev->npinfo) {
2115                 if (slave_enable_netpoll(new_slave)) {
2116                         slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
2117                         res = -EBUSY;
2118                         goto err_detach;
2119                 }
2120         }
2121 #endif
2122
2123         if (!(bond_dev->features & NETIF_F_LRO))
2124                 dev_disable_lro(slave_dev);
2125
2126         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
2127                                          new_slave);
2128         if (res) {
2129                 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
2130                 goto err_detach;
2131         }
2132
2133         res = bond_master_upper_dev_link(bond, new_slave, extack);
2134         if (res) {
2135                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
2136                 goto err_unregister;
2137         }
2138
2139         bond_lower_state_changed(new_slave);
2140
2141         res = bond_sysfs_slave_add(new_slave);
2142         if (res) {
2143                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
2144                 goto err_upper_unlink;
2145         }
2146
2147         /* If the mode uses primary, then the following is handled by
2148          * bond_change_active_slave().
2149          */
2150         if (!bond_uses_primary(bond)) {
2151                 /* set promiscuity level to new slave */
2152                 if (bond_dev->flags & IFF_PROMISC) {
2153                         res = dev_set_promiscuity(slave_dev, 1);
2154                         if (res)
2155                                 goto err_sysfs_del;
2156                 }
2157
2158                 /* set allmulti level to new slave */
2159                 if (bond_dev->flags & IFF_ALLMULTI) {
2160                         res = dev_set_allmulti(slave_dev, 1);
2161                         if (res) {
2162                                 if (bond_dev->flags & IFF_PROMISC)
2163                                         dev_set_promiscuity(slave_dev, -1);
2164                                 goto err_sysfs_del;
2165                         }
2166                 }
2167
2168                 if (bond_dev->flags & IFF_UP) {
2169                         netif_addr_lock_bh(bond_dev);
2170                         dev_mc_sync_multiple(slave_dev, bond_dev);
2171                         dev_uc_sync_multiple(slave_dev, bond_dev);
2172                         netif_addr_unlock_bh(bond_dev);
2173
2174                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2175                                 dev_mc_add(slave_dev, lacpdu_mcast_addr);
2176                 }
2177         }
2178
2179         bond->slave_cnt++;
2180         bond_compute_features(bond);
2181         bond_set_carrier(bond);
2182
2183         if (bond_uses_primary(bond)) {
2184                 block_netpoll_tx();
2185                 bond_select_active_slave(bond);
2186                 unblock_netpoll_tx();
2187         }
2188
2189         if (bond_mode_can_use_xmit_hash(bond))
2190                 bond_update_slave_arr(bond, NULL);
2191
2192
2193         if (!slave_dev->netdev_ops->ndo_bpf ||
2194             !slave_dev->netdev_ops->ndo_xdp_xmit) {
2195                 if (bond->xdp_prog) {
2196                         SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2197                                      "Slave does not support XDP");
2198                         res = -EOPNOTSUPP;
2199                         goto err_sysfs_del;
2200                 }
2201         } else if (bond->xdp_prog) {
2202                 struct netdev_bpf xdp = {
2203                         .command = XDP_SETUP_PROG,
2204                         .flags   = 0,
2205                         .prog    = bond->xdp_prog,
2206                         .extack  = extack,
2207                 };
2208
2209                 if (dev_xdp_prog_count(slave_dev) > 0) {
2210                         SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2211                                      "Slave has XDP program loaded, please unload before enslaving");
2212                         res = -EOPNOTSUPP;
2213                         goto err_sysfs_del;
2214                 }
2215
2216                 res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
2217                 if (res < 0) {
2218                         /* ndo_bpf() sets extack error message */
2219                         slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res);
2220                         goto err_sysfs_del;
2221                 }
2222                 if (bond->xdp_prog)
2223                         bpf_prog_inc(bond->xdp_prog);
2224         }
2225
2226         slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
2227                    bond_is_active_slave(new_slave) ? "an active" : "a backup",
2228                    new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
2229
2230         /* enslave is successful */
2231         bond_queue_slave_event(new_slave);
2232         return 0;
2233
2234 /* Undo stages on error */
2235 err_sysfs_del:
2236         bond_sysfs_slave_del(new_slave);
2237
2238 err_upper_unlink:
2239         bond_upper_dev_unlink(bond, new_slave);
2240
2241 err_unregister:
2242         netdev_rx_handler_unregister(slave_dev);
2243
2244 err_detach:
2245         vlan_vids_del_by_dev(slave_dev, bond_dev);
2246         if (rcu_access_pointer(bond->primary_slave) == new_slave)
2247                 RCU_INIT_POINTER(bond->primary_slave, NULL);
2248         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
2249                 block_netpoll_tx();
2250                 bond_change_active_slave(bond, NULL);
2251                 bond_select_active_slave(bond);
2252                 unblock_netpoll_tx();
2253         }
2254         /* either primary_slave or curr_active_slave might've changed */
2255         synchronize_rcu();
2256         slave_disable_netpoll(new_slave);
2257
2258 err_close:
2259         if (!netif_is_bond_master(slave_dev))
2260                 slave_dev->priv_flags &= ~IFF_BONDING;
2261         dev_close(slave_dev);
2262
2263 err_restore_mac:
2264         slave_dev->flags &= ~IFF_SLAVE;
2265         if (!bond->params.fail_over_mac ||
2266             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2267                 /* XXX TODO - fom follow mode needs to change master's
2268                  * MAC if this slave's MAC is in use by the bond, or at
2269                  * least print a warning.
2270                  */
2271                 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2272                                   new_slave->dev->addr_len);
2273                 ss.ss_family = slave_dev->type;
2274                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2275         }
2276
2277 err_restore_mtu:
2278         dev_set_mtu(slave_dev, new_slave->original_mtu);
2279
2280 err_free:
2281         kobject_put(&new_slave->kobj);
2282
2283 err_undo_flags:
2284         /* Enslave of first slave has failed and we need to fix master's mac */
2285         if (!bond_has_slaves(bond)) {
2286                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
2287                                             slave_dev->dev_addr))
2288                         eth_hw_addr_random(bond_dev);
2289                 if (bond_dev->type != ARPHRD_ETHER) {
2290                         dev_close(bond_dev);
2291                         ether_setup(bond_dev);
2292                         bond_dev->flags |= IFF_MASTER;
2293                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2294                 }
2295         }
2296
2297         return res;
2298 }
2299
2300 /* Try to release the slave device <slave> from the bond device <master>
2301  * It is legal to access curr_active_slave without a lock because all the function
2302  * is RTNL-locked. If "all" is true it means that the function is being called
2303  * while destroying a bond interface and all slaves are being released.
2304  *
2305  * The rules for slave state should be:
2306  *   for Active/Backup:
2307  *     Active stays on all backups go down
2308  *   for Bonded connections:
2309  *     The first up interface should be left on and all others downed.
2310  */
2311 static int __bond_release_one(struct net_device *bond_dev,
2312                               struct net_device *slave_dev,
2313                               bool all, bool unregister)
2314 {
2315         struct bonding *bond = netdev_priv(bond_dev);
2316         struct slave *slave, *oldcurrent;
2317         struct sockaddr_storage ss;
2318         int old_flags = bond_dev->flags;
2319         netdev_features_t old_features = bond_dev->features;
2320
2321         /* slave is not a slave or master is not master of this slave */
2322         if (!(slave_dev->flags & IFF_SLAVE) ||
2323             !netdev_has_upper_dev(slave_dev, bond_dev)) {
2324                 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2325                 return -EINVAL;
2326         }
2327
2328         block_netpoll_tx();
2329
2330         slave = bond_get_slave_by_dev(bond, slave_dev);
2331         if (!slave) {
2332                 /* not a slave of this bond */
2333                 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2334                 unblock_netpoll_tx();
2335                 return -EINVAL;
2336         }
2337
2338         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2339
2340         bond_sysfs_slave_del(slave);
2341
2342         /* recompute stats just before removing the slave */
2343         bond_get_stats(bond->dev, &bond->bond_stats);
2344
2345         if (bond->xdp_prog) {
2346                 struct netdev_bpf xdp = {
2347                         .command = XDP_SETUP_PROG,
2348                         .flags   = 0,
2349                         .prog    = NULL,
2350                         .extack  = NULL,
2351                 };
2352                 if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp))
2353                         slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n");
2354         }
2355
2356         /* unregister rx_handler early so bond_handle_frame wouldn't be called
2357          * for this slave anymore.
2358          */
2359         netdev_rx_handler_unregister(slave_dev);
2360
2361         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2362                 bond_3ad_unbind_slave(slave);
2363
2364         bond_upper_dev_unlink(bond, slave);
2365
2366         if (bond_mode_can_use_xmit_hash(bond))
2367                 bond_update_slave_arr(bond, slave);
2368
2369         slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2370                     bond_is_active_slave(slave) ? "active" : "backup");
2371
2372         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2373
2374         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2375
2376         if (!all && (!bond->params.fail_over_mac ||
2377                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2378                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2379                     bond_has_slaves(bond))
2380                         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",
2381                                    slave->perm_hwaddr);
2382         }
2383
2384         if (rtnl_dereference(bond->primary_slave) == slave)
2385                 RCU_INIT_POINTER(bond->primary_slave, NULL);
2386
2387         if (oldcurrent == slave)
2388                 bond_change_active_slave(bond, NULL);
2389
2390         if (bond_is_lb(bond)) {
2391                 /* Must be called only after the slave has been
2392                  * detached from the list and the curr_active_slave
2393                  * has been cleared (if our_slave == old_current),
2394                  * but before a new active slave is selected.
2395                  */
2396                 bond_alb_deinit_slave(bond, slave);
2397         }
2398
2399         if (all) {
2400                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2401         } else if (oldcurrent == slave) {
2402                 /* Note that we hold RTNL over this sequence, so there
2403                  * is no concern that another slave add/remove event
2404                  * will interfere.
2405                  */
2406                 bond_select_active_slave(bond);
2407         }
2408
2409         bond_set_carrier(bond);
2410         if (!bond_has_slaves(bond))
2411                 eth_hw_addr_random(bond_dev);
2412
2413         unblock_netpoll_tx();
2414         synchronize_rcu();
2415         bond->slave_cnt--;
2416
2417         if (!bond_has_slaves(bond)) {
2418                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2419                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2420         }
2421
2422         bond_compute_features(bond);
2423         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2424             (old_features & NETIF_F_VLAN_CHALLENGED))
2425                 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2426
2427         vlan_vids_del_by_dev(slave_dev, bond_dev);
2428
2429         /* If the mode uses primary, then this case was handled above by
2430          * bond_change_active_slave(..., NULL)
2431          */
2432         if (!bond_uses_primary(bond)) {
2433                 /* unset promiscuity level from slave
2434                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
2435                  * of the IFF_PROMISC flag in the bond_dev, but we need the
2436                  * value of that flag before that change, as that was the value
2437                  * when this slave was attached, so we cache at the start of the
2438                  * function and use it here. Same goes for ALLMULTI below
2439                  */
2440                 if (old_flags & IFF_PROMISC)
2441                         dev_set_promiscuity(slave_dev, -1);
2442
2443                 /* unset allmulti level from slave */
2444                 if (old_flags & IFF_ALLMULTI)
2445                         dev_set_allmulti(slave_dev, -1);
2446
2447                 if (old_flags & IFF_UP)
2448                         bond_hw_addr_flush(bond_dev, slave_dev);
2449         }
2450
2451         slave_disable_netpoll(slave);
2452
2453         /* close slave before restoring its mac address */
2454         dev_close(slave_dev);
2455
2456         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2457             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2458                 /* restore original ("permanent") mac address */
2459                 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2460                                   slave->dev->addr_len);
2461                 ss.ss_family = slave_dev->type;
2462                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2463         }
2464
2465         if (unregister)
2466                 __dev_set_mtu(slave_dev, slave->original_mtu);
2467         else
2468                 dev_set_mtu(slave_dev, slave->original_mtu);
2469
2470         if (!netif_is_bond_master(slave_dev))
2471                 slave_dev->priv_flags &= ~IFF_BONDING;
2472
2473         kobject_put(&slave->kobj);
2474
2475         return 0;
2476 }
2477
2478 /* A wrapper used because of ndo_del_link */
2479 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2480 {
2481         return __bond_release_one(bond_dev, slave_dev, false, false);
2482 }
2483
2484 /* First release a slave and then destroy the bond if no more slaves are left.
2485  * Must be under rtnl_lock when this function is called.
2486  */
2487 static int bond_release_and_destroy(struct net_device *bond_dev,
2488                                     struct net_device *slave_dev)
2489 {
2490         struct bonding *bond = netdev_priv(bond_dev);
2491         int ret;
2492
2493         ret = __bond_release_one(bond_dev, slave_dev, false, true);
2494         if (ret == 0 && !bond_has_slaves(bond) &&
2495             bond_dev->reg_state != NETREG_UNREGISTERING) {
2496                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2497                 netdev_info(bond_dev, "Destroying bond\n");
2498                 bond_remove_proc_entry(bond);
2499                 unregister_netdevice(bond_dev);
2500         }
2501         return ret;
2502 }
2503
2504 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2505 {
2506         struct bonding *bond = netdev_priv(bond_dev);
2507
2508         bond_fill_ifbond(bond, info);
2509 }
2510
2511 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2512 {
2513         struct bonding *bond = netdev_priv(bond_dev);
2514         struct list_head *iter;
2515         int i = 0, res = -ENODEV;
2516         struct slave *slave;
2517
2518         bond_for_each_slave(bond, slave, iter) {
2519                 if (i++ == (int)info->slave_id) {
2520                         res = 0;
2521                         bond_fill_ifslave(slave, info);
2522                         break;
2523                 }
2524         }
2525
2526         return res;
2527 }
2528
2529 /*-------------------------------- Monitoring -------------------------------*/
2530
2531 /* called with rcu_read_lock() */
2532 static int bond_miimon_inspect(struct bonding *bond)
2533 {
2534         int link_state, commit = 0;
2535         struct list_head *iter;
2536         struct slave *slave;
2537         bool ignore_updelay;
2538
2539         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2540
2541         bond_for_each_slave_rcu(bond, slave, iter) {
2542                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2543
2544                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2545
2546                 switch (slave->link) {
2547                 case BOND_LINK_UP:
2548                         if (link_state)
2549                                 continue;
2550
2551                         bond_propose_link_state(slave, BOND_LINK_FAIL);
2552                         commit++;
2553                         slave->delay = bond->params.downdelay;
2554                         if (slave->delay) {
2555                                 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2556                                            (BOND_MODE(bond) ==
2557                                             BOND_MODE_ACTIVEBACKUP) ?
2558                                             (bond_is_active_slave(slave) ?
2559                                              "active " : "backup ") : "",
2560                                            bond->params.downdelay * bond->params.miimon);
2561                         }
2562                         fallthrough;
2563                 case BOND_LINK_FAIL:
2564                         if (link_state) {
2565                                 /* recovered before downdelay expired */
2566                                 bond_propose_link_state(slave, BOND_LINK_UP);
2567                                 slave->last_link_up = jiffies;
2568                                 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2569                                            (bond->params.downdelay - slave->delay) *
2570                                            bond->params.miimon);
2571                                 commit++;
2572                                 continue;
2573                         }
2574
2575                         if (slave->delay <= 0) {
2576                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2577                                 commit++;
2578                                 continue;
2579                         }
2580
2581                         slave->delay--;
2582                         break;
2583
2584                 case BOND_LINK_DOWN:
2585                         if (!link_state)
2586                                 continue;
2587
2588                         bond_propose_link_state(slave, BOND_LINK_BACK);
2589                         commit++;
2590                         slave->delay = bond->params.updelay;
2591
2592                         if (slave->delay) {
2593                                 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2594                                            ignore_updelay ? 0 :
2595                                            bond->params.updelay *
2596                                            bond->params.miimon);
2597                         }
2598                         fallthrough;
2599                 case BOND_LINK_BACK:
2600                         if (!link_state) {
2601                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2602                                 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2603                                            (bond->params.updelay - slave->delay) *
2604                                            bond->params.miimon);
2605                                 commit++;
2606                                 continue;
2607                         }
2608
2609                         if (ignore_updelay)
2610                                 slave->delay = 0;
2611
2612                         if (slave->delay <= 0) {
2613                                 bond_propose_link_state(slave, BOND_LINK_UP);
2614                                 commit++;
2615                                 ignore_updelay = false;
2616                                 continue;
2617                         }
2618
2619                         slave->delay--;
2620                         break;
2621                 }
2622         }
2623
2624         return commit;
2625 }
2626
2627 static void bond_miimon_link_change(struct bonding *bond,
2628                                     struct slave *slave,
2629                                     char link)
2630 {
2631         switch (BOND_MODE(bond)) {
2632         case BOND_MODE_8023AD:
2633                 bond_3ad_handle_link_change(slave, link);
2634                 break;
2635         case BOND_MODE_TLB:
2636         case BOND_MODE_ALB:
2637                 bond_alb_handle_link_change(bond, slave, link);
2638                 break;
2639         case BOND_MODE_XOR:
2640                 bond_update_slave_arr(bond, NULL);
2641                 break;
2642         }
2643 }
2644
2645 static void bond_miimon_commit(struct bonding *bond)
2646 {
2647         struct list_head *iter;
2648         struct slave *slave, *primary;
2649
2650         bond_for_each_slave(bond, slave, iter) {
2651                 switch (slave->link_new_state) {
2652                 case BOND_LINK_NOCHANGE:
2653                         /* For 802.3ad mode, check current slave speed and
2654                          * duplex again in case its port was disabled after
2655                          * invalid speed/duplex reporting but recovered before
2656                          * link monitoring could make a decision on the actual
2657                          * link status
2658                          */
2659                         if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2660                             slave->link == BOND_LINK_UP)
2661                                 bond_3ad_adapter_speed_duplex_changed(slave);
2662                         continue;
2663
2664                 case BOND_LINK_UP:
2665                         if (bond_update_speed_duplex(slave) &&
2666                             bond_needs_speed_duplex(bond)) {
2667                                 slave->link = BOND_LINK_DOWN;
2668                                 if (net_ratelimit())
2669                                         slave_warn(bond->dev, slave->dev,
2670                                                    "failed to get link speed/duplex\n");
2671                                 continue;
2672                         }
2673                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2674                                                   BOND_SLAVE_NOTIFY_NOW);
2675                         slave->last_link_up = jiffies;
2676
2677                         primary = rtnl_dereference(bond->primary_slave);
2678                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2679                                 /* prevent it from being the active one */
2680                                 bond_set_backup_slave(slave);
2681                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2682                                 /* make it immediately active */
2683                                 bond_set_active_slave(slave);
2684                         }
2685
2686                         slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2687                                    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2688                                    slave->duplex ? "full" : "half");
2689
2690                         bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2691
2692                         if (!bond->curr_active_slave || slave == primary)
2693                                 goto do_failover;
2694
2695                         continue;
2696
2697                 case BOND_LINK_DOWN:
2698                         if (slave->link_failure_count < UINT_MAX)
2699                                 slave->link_failure_count++;
2700
2701                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2702                                                   BOND_SLAVE_NOTIFY_NOW);
2703
2704                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2705                             BOND_MODE(bond) == BOND_MODE_8023AD)
2706                                 bond_set_slave_inactive_flags(slave,
2707                                                               BOND_SLAVE_NOTIFY_NOW);
2708
2709                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2710
2711                         bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2712
2713                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2714                                 goto do_failover;
2715
2716                         continue;
2717
2718                 default:
2719                         slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2720                                   slave->link_new_state);
2721                         bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2722
2723                         continue;
2724                 }
2725
2726 do_failover:
2727                 block_netpoll_tx();
2728                 bond_select_active_slave(bond);
2729                 unblock_netpoll_tx();
2730         }
2731
2732         bond_set_carrier(bond);
2733 }
2734
2735 /* bond_mii_monitor
2736  *
2737  * Really a wrapper that splits the mii monitor into two phases: an
2738  * inspection, then (if inspection indicates something needs to be done)
2739  * an acquisition of appropriate locks followed by a commit phase to
2740  * implement whatever link state changes are indicated.
2741  */
2742 static void bond_mii_monitor(struct work_struct *work)
2743 {
2744         struct bonding *bond = container_of(work, struct bonding,
2745                                             mii_work.work);
2746         bool should_notify_peers = false;
2747         bool commit;
2748         unsigned long delay;
2749         struct slave *slave;
2750         struct list_head *iter;
2751
2752         delay = msecs_to_jiffies(bond->params.miimon);
2753
2754         if (!bond_has_slaves(bond))
2755                 goto re_arm;
2756
2757         rcu_read_lock();
2758         should_notify_peers = bond_should_notify_peers(bond);
2759         commit = !!bond_miimon_inspect(bond);
2760         if (bond->send_peer_notif) {
2761                 rcu_read_unlock();
2762                 if (rtnl_trylock()) {
2763                         bond->send_peer_notif--;
2764                         rtnl_unlock();
2765                 }
2766         } else {
2767                 rcu_read_unlock();
2768         }
2769
2770         if (commit) {
2771                 /* Race avoidance with bond_close cancel of workqueue */
2772                 if (!rtnl_trylock()) {
2773                         delay = 1;
2774                         should_notify_peers = false;
2775                         goto re_arm;
2776                 }
2777
2778                 bond_for_each_slave(bond, slave, iter) {
2779                         bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2780                 }
2781                 bond_miimon_commit(bond);
2782
2783                 rtnl_unlock();  /* might sleep, hold no other locks */
2784         }
2785
2786 re_arm:
2787         if (bond->params.miimon)
2788                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2789
2790         if (should_notify_peers) {
2791                 if (!rtnl_trylock())
2792                         return;
2793                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2794                 rtnl_unlock();
2795         }
2796 }
2797
2798 static int bond_upper_dev_walk(struct net_device *upper,
2799                                struct netdev_nested_priv *priv)
2800 {
2801         __be32 ip = *(__be32 *)priv->data;
2802
2803         return ip == bond_confirm_addr(upper, 0, ip);
2804 }
2805
2806 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2807 {
2808         struct netdev_nested_priv priv = {
2809                 .data = (void *)&ip,
2810         };
2811         bool ret = false;
2812
2813         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2814                 return true;
2815
2816         rcu_read_lock();
2817         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
2818                 ret = true;
2819         rcu_read_unlock();
2820
2821         return ret;
2822 }
2823
2824 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags,
2825                              struct sk_buff *skb)
2826 {
2827         struct net_device *bond_dev = slave->bond->dev;
2828         struct net_device *slave_dev = slave->dev;
2829         struct bond_vlan_tag *outer_tag = tags;
2830
2831         if (!tags || tags->vlan_proto == VLAN_N_VID)
2832                 return true;
2833
2834         tags++;
2835
2836         /* Go through all the tags backwards and add them to the packet */
2837         while (tags->vlan_proto != VLAN_N_VID) {
2838                 if (!tags->vlan_id) {
2839                         tags++;
2840                         continue;
2841                 }
2842
2843                 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2844                           ntohs(outer_tag->vlan_proto), tags->vlan_id);
2845                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2846                                                 tags->vlan_id);
2847                 if (!skb) {
2848                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2849                         return false;
2850                 }
2851
2852                 tags++;
2853         }
2854         /* Set the outer tag */
2855         if (outer_tag->vlan_id) {
2856                 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2857                           ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2858                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2859                                        outer_tag->vlan_id);
2860         }
2861
2862         return true;
2863 }
2864
2865 /* We go to the (large) trouble of VLAN tagging ARP frames because
2866  * switches in VLAN mode (especially if ports are configured as
2867  * "native" to a VLAN) might not pass non-tagged frames.
2868  */
2869 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2870                           __be32 src_ip, struct bond_vlan_tag *tags)
2871 {
2872         struct net_device *bond_dev = slave->bond->dev;
2873         struct net_device *slave_dev = slave->dev;
2874         struct sk_buff *skb;
2875
2876         slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2877                   arp_op, &dest_ip, &src_ip);
2878
2879         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2880                          NULL, slave_dev->dev_addr, NULL);
2881
2882         if (!skb) {
2883                 net_err_ratelimited("ARP packet allocation failed\n");
2884                 return;
2885         }
2886
2887         if (bond_handle_vlan(slave, tags, skb)) {
2888                 slave_update_last_tx(slave);
2889                 arp_xmit(skb);
2890         }
2891
2892         return;
2893 }
2894
2895 /* Validate the device path between the @start_dev and the @end_dev.
2896  * The path is valid if the @end_dev is reachable through device
2897  * stacking.
2898  * When the path is validated, collect any vlan information in the
2899  * path.
2900  */
2901 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2902                                               struct net_device *end_dev,
2903                                               int level)
2904 {
2905         struct bond_vlan_tag *tags;
2906         struct net_device *upper;
2907         struct list_head  *iter;
2908
2909         if (start_dev == end_dev) {
2910                 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2911                 if (!tags)
2912                         return ERR_PTR(-ENOMEM);
2913                 tags[level].vlan_proto = VLAN_N_VID;
2914                 return tags;
2915         }
2916
2917         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2918                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2919                 if (IS_ERR_OR_NULL(tags)) {
2920                         if (IS_ERR(tags))
2921                                 return tags;
2922                         continue;
2923                 }
2924                 if (is_vlan_dev(upper)) {
2925                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2926                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2927                 }
2928
2929                 return tags;
2930         }
2931
2932         return NULL;
2933 }
2934
2935 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2936 {
2937         struct rtable *rt;
2938         struct bond_vlan_tag *tags;
2939         __be32 *targets = bond->params.arp_targets, addr;
2940         int i;
2941
2942         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2943                 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2944                           __func__, &targets[i]);
2945                 tags = NULL;
2946
2947                 /* Find out through which dev should the packet go */
2948                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2949                                      RTO_ONLINK, 0);
2950                 if (IS_ERR(rt)) {
2951                         /* there's no route to target - try to send arp
2952                          * probe to generate any traffic (arp_validate=0)
2953                          */
2954                         if (bond->params.arp_validate)
2955                                 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2956                                              bond->dev->name,
2957                                              &targets[i]);
2958                         bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2959                                       0, tags);
2960                         continue;
2961                 }
2962
2963                 /* bond device itself */
2964                 if (rt->dst.dev == bond->dev)
2965                         goto found;
2966
2967                 rcu_read_lock();
2968                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2969                 rcu_read_unlock();
2970
2971                 if (!IS_ERR_OR_NULL(tags))
2972                         goto found;
2973
2974                 /* Not our device - skip */
2975                 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2976                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2977
2978                 ip_rt_put(rt);
2979                 continue;
2980
2981 found:
2982                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2983                 ip_rt_put(rt);
2984                 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2985                 kfree(tags);
2986         }
2987 }
2988
2989 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2990 {
2991         int i;
2992
2993         if (!sip || !bond_has_this_ip(bond, tip)) {
2994                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2995                            __func__, &sip, &tip);
2996                 return;
2997         }
2998
2999         i = bond_get_targets_ip(bond->params.arp_targets, sip);
3000         if (i == -1) {
3001                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
3002                            __func__, &sip);
3003                 return;
3004         }
3005         slave->last_rx = jiffies;
3006         slave->target_last_arp_rx[i] = jiffies;
3007 }
3008
3009 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
3010                         struct slave *slave)
3011 {
3012         struct arphdr *arp = (struct arphdr *)skb->data;
3013         struct slave *curr_active_slave, *curr_arp_slave;
3014         unsigned char *arp_ptr;
3015         __be32 sip, tip;
3016         unsigned int alen;
3017
3018         alen = arp_hdr_len(bond->dev);
3019
3020         if (alen > skb_headlen(skb)) {
3021                 arp = kmalloc(alen, GFP_ATOMIC);
3022                 if (!arp)
3023                         goto out_unlock;
3024                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
3025                         goto out_unlock;
3026         }
3027
3028         if (arp->ar_hln != bond->dev->addr_len ||
3029             skb->pkt_type == PACKET_OTHERHOST ||
3030             skb->pkt_type == PACKET_LOOPBACK ||
3031             arp->ar_hrd != htons(ARPHRD_ETHER) ||
3032             arp->ar_pro != htons(ETH_P_IP) ||
3033             arp->ar_pln != 4)
3034                 goto out_unlock;
3035
3036         arp_ptr = (unsigned char *)(arp + 1);
3037         arp_ptr += bond->dev->addr_len;
3038         memcpy(&sip, arp_ptr, 4);
3039         arp_ptr += 4 + bond->dev->addr_len;
3040         memcpy(&tip, arp_ptr, 4);
3041
3042         slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
3043                   __func__, slave->dev->name, bond_slave_state(slave),
3044                   bond->params.arp_validate, slave_do_arp_validate(bond, slave),
3045                   &sip, &tip);
3046
3047         curr_active_slave = rcu_dereference(bond->curr_active_slave);
3048         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
3049
3050         /* We 'trust' the received ARP enough to validate it if:
3051          *
3052          * (a) the slave receiving the ARP is active (which includes the
3053          * current ARP slave, if any), or
3054          *
3055          * (b) the receiving slave isn't active, but there is a currently
3056          * active slave and it received valid arp reply(s) after it became
3057          * the currently active slave, or
3058          *
3059          * (c) there is an ARP slave that sent an ARP during the prior ARP
3060          * interval, and we receive an ARP reply on any slave.  We accept
3061          * these because switch FDB update delays may deliver the ARP
3062          * reply to a slave other than the sender of the ARP request.
3063          *
3064          * Note: for (b), backup slaves are receiving the broadcast ARP
3065          * request, not a reply.  This request passes from the sending
3066          * slave through the L2 switch(es) to the receiving slave.  Since
3067          * this is checking the request, sip/tip are swapped for
3068          * validation.
3069          *
3070          * This is done to avoid endless looping when we can't reach the
3071          * arp_ip_target and fool ourselves with our own arp requests.
3072          */
3073         if (bond_is_active_slave(slave))
3074                 bond_validate_arp(bond, slave, sip, tip);
3075         else if (curr_active_slave &&
3076                  time_after(slave_last_rx(bond, curr_active_slave),
3077                             curr_active_slave->last_link_up))
3078                 bond_validate_arp(bond, slave, tip, sip);
3079         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
3080                  bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))
3081                 bond_validate_arp(bond, slave, sip, tip);
3082
3083 out_unlock:
3084         if (arp != (struct arphdr *)skb->data)
3085                 kfree(arp);
3086         return RX_HANDLER_ANOTHER;
3087 }
3088
3089 #if IS_ENABLED(CONFIG_IPV6)
3090 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr,
3091                          const struct in6_addr *saddr, struct bond_vlan_tag *tags)
3092 {
3093         struct net_device *bond_dev = slave->bond->dev;
3094         struct net_device *slave_dev = slave->dev;
3095         struct in6_addr mcaddr;
3096         struct sk_buff *skb;
3097
3098         slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n",
3099                   daddr, saddr);
3100
3101         skb = ndisc_ns_create(slave_dev, daddr, saddr, 0);
3102         if (!skb) {
3103                 net_err_ratelimited("NS packet allocation failed\n");
3104                 return;
3105         }
3106
3107         addrconf_addr_solict_mult(daddr, &mcaddr);
3108         if (bond_handle_vlan(slave, tags, skb)) {
3109                 slave_update_last_tx(slave);
3110                 ndisc_send_skb(skb, &mcaddr, saddr);
3111         }
3112 }
3113
3114 static void bond_ns_send_all(struct bonding *bond, struct slave *slave)
3115 {
3116         struct in6_addr *targets = bond->params.ns_targets;
3117         struct bond_vlan_tag *tags;
3118         struct dst_entry *dst;
3119         struct in6_addr saddr;
3120         struct flowi6 fl6;
3121         int i;
3122
3123         for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) {
3124                 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n",
3125                           __func__, &targets[i]);
3126                 tags = NULL;
3127
3128                 /* Find out through which dev should the packet go */
3129                 memset(&fl6, 0, sizeof(struct flowi6));
3130                 fl6.daddr = targets[i];
3131                 fl6.flowi6_oif = bond->dev->ifindex;
3132
3133                 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6);
3134                 if (dst->error) {
3135                         dst_release(dst);
3136                         /* there's no route to target - try to send arp
3137                          * probe to generate any traffic (arp_validate=0)
3138                          */
3139                         if (bond->params.arp_validate)
3140                                 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n",
3141                                              bond->dev->name,
3142                                              &targets[i]);
3143                         bond_ns_send(slave, &targets[i], &in6addr_any, tags);
3144                         continue;
3145                 }
3146
3147                 /* bond device itself */
3148                 if (dst->dev == bond->dev)
3149                         goto found;
3150
3151                 rcu_read_lock();
3152                 tags = bond_verify_device_path(bond->dev, dst->dev, 0);
3153                 rcu_read_unlock();
3154
3155                 if (!IS_ERR_OR_NULL(tags))
3156                         goto found;
3157
3158                 /* Not our device - skip */
3159                 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n",
3160                           &targets[i], dst->dev ? dst->dev->name : "NULL");
3161
3162                 dst_release(dst);
3163                 continue;
3164
3165 found:
3166                 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr))
3167                         bond_ns_send(slave, &targets[i], &saddr, tags);
3168                 else
3169                         bond_ns_send(slave, &targets[i], &in6addr_any, tags);
3170
3171                 dst_release(dst);
3172                 kfree(tags);
3173         }
3174 }
3175
3176 static int bond_confirm_addr6(struct net_device *dev,
3177                               struct netdev_nested_priv *priv)
3178 {
3179         struct in6_addr *addr = (struct in6_addr *)priv->data;
3180
3181         return ipv6_chk_addr(dev_net(dev), addr, dev, 0);
3182 }
3183
3184 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr)
3185 {
3186         struct netdev_nested_priv priv = {
3187                 .data = addr,
3188         };
3189         int ret = false;
3190
3191         if (bond_confirm_addr6(bond->dev, &priv))
3192                 return true;
3193
3194         rcu_read_lock();
3195         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv))
3196                 ret = true;
3197         rcu_read_unlock();
3198
3199         return ret;
3200 }
3201
3202 static void bond_validate_na(struct bonding *bond, struct slave *slave,
3203                              struct in6_addr *saddr, struct in6_addr *daddr)
3204 {
3205         int i;
3206
3207         /* Ignore NAs that:
3208          * 1. Source address is unspecified address.
3209          * 2. Dest address is neither all-nodes multicast address nor
3210          *    exist on bond interface.
3211          */
3212         if (ipv6_addr_any(saddr) ||
3213             (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) &&
3214              !bond_has_this_ip6(bond, daddr))) {
3215                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n",
3216                           __func__, saddr, daddr);
3217                 return;
3218         }
3219
3220         i = bond_get_targets_ip6(bond->params.ns_targets, saddr);
3221         if (i == -1) {
3222                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n",
3223                           __func__, saddr);
3224                 return;
3225         }
3226         slave->last_rx = jiffies;
3227         slave->target_last_arp_rx[i] = jiffies;
3228 }
3229
3230 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond,
3231                        struct slave *slave)
3232 {
3233         struct slave *curr_active_slave, *curr_arp_slave;
3234         struct icmp6hdr *hdr = icmp6_hdr(skb);
3235         struct in6_addr *saddr, *daddr;
3236
3237         if (skb->pkt_type == PACKET_OTHERHOST ||
3238             skb->pkt_type == PACKET_LOOPBACK ||
3239             hdr->icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT)
3240                 goto out;
3241
3242         saddr = &ipv6_hdr(skb)->saddr;
3243         daddr = &ipv6_hdr(skb)->daddr;
3244
3245         slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n",
3246                   __func__, slave->dev->name, bond_slave_state(slave),
3247                   bond->params.arp_validate, slave_do_arp_validate(bond, slave),
3248                   saddr, daddr);
3249
3250         curr_active_slave = rcu_dereference(bond->curr_active_slave);
3251         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
3252
3253         /* We 'trust' the received ARP enough to validate it if:
3254          * see bond_arp_rcv().
3255          */
3256         if (bond_is_active_slave(slave))
3257                 bond_validate_na(bond, slave, saddr, daddr);
3258         else if (curr_active_slave &&
3259                  time_after(slave_last_rx(bond, curr_active_slave),
3260                             curr_active_slave->last_link_up))
3261                 bond_validate_na(bond, slave, saddr, daddr);
3262         else if (curr_arp_slave &&
3263                  bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))
3264                 bond_validate_na(bond, slave, saddr, daddr);
3265
3266 out:
3267         return RX_HANDLER_ANOTHER;
3268 }
3269 #endif
3270
3271 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond,
3272                       struct slave *slave)
3273 {
3274 #if IS_ENABLED(CONFIG_IPV6)
3275         bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6);
3276 #endif
3277         bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
3278
3279         slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
3280                   __func__, skb->dev->name);
3281
3282         /* Use arp validate logic for both ARP and NS */
3283         if (!slave_do_arp_validate(bond, slave)) {
3284                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
3285 #if IS_ENABLED(CONFIG_IPV6)
3286                     (slave_do_arp_validate_only(bond) && is_ipv6) ||
3287 #endif
3288                     !slave_do_arp_validate_only(bond))
3289                         slave->last_rx = jiffies;
3290                 return RX_HANDLER_ANOTHER;
3291         } else if (is_arp) {
3292                 return bond_arp_rcv(skb, bond, slave);
3293 #if IS_ENABLED(CONFIG_IPV6)
3294         } else if (is_ipv6) {
3295                 return bond_na_rcv(skb, bond, slave);
3296 #endif
3297         } else {
3298                 return RX_HANDLER_ANOTHER;
3299         }
3300 }
3301
3302 static void bond_send_validate(struct bonding *bond, struct slave *slave)
3303 {
3304         bond_arp_send_all(bond, slave);
3305 #if IS_ENABLED(CONFIG_IPV6)
3306         bond_ns_send_all(bond, slave);
3307 #endif
3308 }
3309
3310 /* function to verify if we're in the arp_interval timeslice, returns true if
3311  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
3312  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
3313  */
3314 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
3315                                   int mod)
3316 {
3317         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3318
3319         return time_in_range(jiffies,
3320                              last_act - delta_in_ticks,
3321                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
3322 }
3323
3324 /* This function is called regularly to monitor each slave's link
3325  * ensuring that traffic is being sent and received when arp monitoring
3326  * is used in load-balancing mode. if the adapter has been dormant, then an
3327  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
3328  * arp monitoring in active backup mode.
3329  */
3330 static void bond_loadbalance_arp_mon(struct bonding *bond)
3331 {
3332         struct slave *slave, *oldcurrent;
3333         struct list_head *iter;
3334         int do_failover = 0, slave_state_changed = 0;
3335
3336         if (!bond_has_slaves(bond))
3337                 goto re_arm;
3338
3339         rcu_read_lock();
3340
3341         oldcurrent = rcu_dereference(bond->curr_active_slave);
3342         /* see if any of the previous devices are up now (i.e. they have
3343          * xmt and rcv traffic). the curr_active_slave does not come into
3344          * the picture unless it is null. also, slave->last_link_up is not
3345          * needed here because we send an arp on each slave and give a slave
3346          * as long as it needs to get the tx/rx within the delta.
3347          * TODO: what about up/down delay in arp mode? it wasn't here before
3348          *       so it can wait
3349          */
3350         bond_for_each_slave_rcu(bond, slave, iter) {
3351                 unsigned long last_tx = slave_last_tx(slave);
3352
3353                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3354
3355                 if (slave->link != BOND_LINK_UP) {
3356                         if (bond_time_in_interval(bond, last_tx, 1) &&
3357                             bond_time_in_interval(bond, slave->last_rx, 1)) {
3358
3359                                 bond_propose_link_state(slave, BOND_LINK_UP);
3360                                 slave_state_changed = 1;
3361
3362                                 /* primary_slave has no meaning in round-robin
3363                                  * mode. the window of a slave being up and
3364                                  * curr_active_slave being null after enslaving
3365                                  * is closed.
3366                                  */
3367                                 if (!oldcurrent) {
3368                                         slave_info(bond->dev, slave->dev, "link status definitely up\n");
3369                                         do_failover = 1;
3370                                 } else {
3371                                         slave_info(bond->dev, slave->dev, "interface is now up\n");
3372                                 }
3373                         }
3374                 } else {
3375                         /* slave->link == BOND_LINK_UP */
3376
3377                         /* not all switches will respond to an arp request
3378                          * when the source ip is 0, so don't take the link down
3379                          * if we don't know our ip yet
3380                          */
3381                         if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||
3382                             !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) {
3383
3384                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
3385                                 slave_state_changed = 1;
3386
3387                                 if (slave->link_failure_count < UINT_MAX)
3388                                         slave->link_failure_count++;
3389
3390                                 slave_info(bond->dev, slave->dev, "interface is now down\n");
3391
3392                                 if (slave == oldcurrent)
3393                                         do_failover = 1;
3394                         }
3395                 }
3396
3397                 /* note: if switch is in round-robin mode, all links
3398                  * must tx arp to ensure all links rx an arp - otherwise
3399                  * links may oscillate or not come up at all; if switch is
3400                  * in something like xor mode, there is nothing we can
3401                  * do - all replies will be rx'ed on same link causing slaves
3402                  * to be unstable during low/no traffic periods
3403                  */
3404                 if (bond_slave_is_up(slave))
3405                         bond_send_validate(bond, slave);
3406         }
3407
3408         rcu_read_unlock();
3409
3410         if (do_failover || slave_state_changed) {
3411                 if (!rtnl_trylock())
3412                         goto re_arm;
3413
3414                 bond_for_each_slave(bond, slave, iter) {
3415                         if (slave->link_new_state != BOND_LINK_NOCHANGE)
3416                                 slave->link = slave->link_new_state;
3417                 }
3418
3419                 if (slave_state_changed) {
3420                         bond_slave_state_change(bond);
3421                         if (BOND_MODE(bond) == BOND_MODE_XOR)
3422                                 bond_update_slave_arr(bond, NULL);
3423                 }
3424                 if (do_failover) {
3425                         block_netpoll_tx();
3426                         bond_select_active_slave(bond);
3427                         unblock_netpoll_tx();
3428                 }
3429                 rtnl_unlock();
3430         }
3431
3432 re_arm:
3433         if (bond->params.arp_interval)
3434                 queue_delayed_work(bond->wq, &bond->arp_work,
3435                                    msecs_to_jiffies(bond->params.arp_interval));
3436 }
3437
3438 /* Called to inspect slaves for active-backup mode ARP monitor link state
3439  * changes.  Sets proposed link state in slaves to specify what action
3440  * should take place for the slave.  Returns 0 if no changes are found, >0
3441  * if changes to link states must be committed.
3442  *
3443  * Called with rcu_read_lock held.
3444  */
3445 static int bond_ab_arp_inspect(struct bonding *bond)
3446 {
3447         unsigned long last_tx, last_rx;
3448         struct list_head *iter;
3449         struct slave *slave;
3450         int commit = 0;
3451
3452         bond_for_each_slave_rcu(bond, slave, iter) {
3453                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3454                 last_rx = slave_last_rx(bond, slave);
3455
3456                 if (slave->link != BOND_LINK_UP) {
3457                         if (bond_time_in_interval(bond, last_rx, 1)) {
3458                                 bond_propose_link_state(slave, BOND_LINK_UP);
3459                                 commit++;
3460                         } else if (slave->link == BOND_LINK_BACK) {
3461                                 bond_propose_link_state(slave, BOND_LINK_FAIL);
3462                                 commit++;
3463                         }
3464                         continue;
3465                 }
3466
3467                 /* Give slaves 2*delta after being enslaved or made
3468                  * active.  This avoids bouncing, as the last receive
3469                  * times need a full ARP monitor cycle to be updated.
3470                  */
3471                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
3472                         continue;
3473
3474                 /* Backup slave is down if:
3475                  * - No current_arp_slave AND
3476                  * - more than (missed_max+1)*delta since last receive AND
3477                  * - the bond has an IP address
3478                  *
3479                  * Note: a non-null current_arp_slave indicates
3480                  * the curr_active_slave went down and we are
3481                  * searching for a new one; under this condition
3482                  * we only take the curr_active_slave down - this
3483                  * gives each slave a chance to tx/rx traffic
3484                  * before being taken out
3485                  */
3486                 if (!bond_is_active_slave(slave) &&
3487                     !rcu_access_pointer(bond->current_arp_slave) &&
3488                     !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) {
3489                         bond_propose_link_state(slave, BOND_LINK_DOWN);
3490                         commit++;
3491                 }
3492
3493                 /* Active slave is down if:
3494                  * - more than missed_max*delta since transmitting OR
3495                  * - (more than missed_max*delta since receive AND
3496                  *    the bond has an IP address)
3497                  */
3498                 last_tx = slave_last_tx(slave);
3499                 if (bond_is_active_slave(slave) &&
3500                     (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||
3501                      !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) {
3502                         bond_propose_link_state(slave, BOND_LINK_DOWN);
3503                         commit++;
3504                 }
3505         }
3506
3507         return commit;
3508 }
3509
3510 /* Called to commit link state changes noted by inspection step of
3511  * active-backup mode ARP monitor.
3512  *
3513  * Called with RTNL hold.
3514  */
3515 static void bond_ab_arp_commit(struct bonding *bond)
3516 {
3517         struct list_head *iter;
3518         unsigned long last_tx;
3519         struct slave *slave;
3520
3521         bond_for_each_slave(bond, slave, iter) {
3522                 switch (slave->link_new_state) {
3523                 case BOND_LINK_NOCHANGE:
3524                         continue;
3525
3526                 case BOND_LINK_UP:
3527                         last_tx = slave_last_tx(slave);
3528                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
3529                             (!rtnl_dereference(bond->curr_active_slave) &&
3530                              bond_time_in_interval(bond, last_tx, 1))) {
3531                                 struct slave *current_arp_slave;
3532
3533                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3534                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
3535                                                           BOND_SLAVE_NOTIFY_NOW);
3536                                 if (current_arp_slave) {
3537                                         bond_set_slave_inactive_flags(
3538                                                 current_arp_slave,
3539                                                 BOND_SLAVE_NOTIFY_NOW);
3540                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3541                                 }
3542
3543                                 slave_info(bond->dev, slave->dev, "link status definitely up\n");
3544
3545                                 if (!rtnl_dereference(bond->curr_active_slave) ||
3546                                     slave == rtnl_dereference(bond->primary_slave))
3547                                         goto do_failover;
3548
3549                         }
3550
3551                         continue;
3552
3553                 case BOND_LINK_DOWN:
3554                         if (slave->link_failure_count < UINT_MAX)
3555                                 slave->link_failure_count++;
3556
3557                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3558                                                   BOND_SLAVE_NOTIFY_NOW);
3559                         bond_set_slave_inactive_flags(slave,
3560                                                       BOND_SLAVE_NOTIFY_NOW);
3561
3562                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3563
3564                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
3565                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3566                                 goto do_failover;
3567                         }
3568
3569                         continue;
3570
3571                 case BOND_LINK_FAIL:
3572                         bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3573                                                   BOND_SLAVE_NOTIFY_NOW);
3574                         bond_set_slave_inactive_flags(slave,
3575                                                       BOND_SLAVE_NOTIFY_NOW);
3576
3577                         /* A slave has just been enslaved and has become
3578                          * the current active slave.
3579                          */
3580                         if (rtnl_dereference(bond->curr_active_slave))
3581                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3582                         continue;
3583
3584                 default:
3585                         slave_err(bond->dev, slave->dev,
3586                                   "impossible: link_new_state %d on slave\n",
3587                                   slave->link_new_state);
3588                         continue;
3589                 }
3590
3591 do_failover:
3592                 block_netpoll_tx();
3593                 bond_select_active_slave(bond);
3594                 unblock_netpoll_tx();
3595         }
3596
3597         bond_set_carrier(bond);
3598 }
3599
3600 /* Send ARP probes for active-backup mode ARP monitor.
3601  *
3602  * Called with rcu_read_lock held.
3603  */
3604 static bool bond_ab_arp_probe(struct bonding *bond)
3605 {
3606         struct slave *slave, *before = NULL, *new_slave = NULL,
3607                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3608                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3609         struct list_head *iter;
3610         bool found = false;
3611         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3612
3613         if (curr_arp_slave && curr_active_slave)
3614                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3615                             curr_arp_slave->dev->name,
3616                             curr_active_slave->dev->name);
3617
3618         if (curr_active_slave) {
3619                 bond_send_validate(bond, curr_active_slave);
3620                 return should_notify_rtnl;
3621         }
3622
3623         /* if we don't have a curr_active_slave, search for the next available
3624          * backup slave from the current_arp_slave and make it the candidate
3625          * for becoming the curr_active_slave
3626          */
3627
3628         if (!curr_arp_slave) {
3629                 curr_arp_slave = bond_first_slave_rcu(bond);
3630                 if (!curr_arp_slave)
3631                         return should_notify_rtnl;
3632         }
3633
3634         bond_for_each_slave_rcu(bond, slave, iter) {
3635                 if (!found && !before && bond_slave_is_up(slave))
3636                         before = slave;
3637
3638                 if (found && !new_slave && bond_slave_is_up(slave))
3639                         new_slave = slave;
3640                 /* if the link state is up at this point, we
3641                  * mark it down - this can happen if we have
3642                  * simultaneous link failures and
3643                  * reselect_active_interface doesn't make this
3644                  * one the current slave so it is still marked
3645                  * up when it is actually down
3646                  */
3647                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3648                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3649                                                   BOND_SLAVE_NOTIFY_LATER);
3650                         if (slave->link_failure_count < UINT_MAX)
3651                                 slave->link_failure_count++;
3652
3653                         bond_set_slave_inactive_flags(slave,
3654                                                       BOND_SLAVE_NOTIFY_LATER);
3655
3656                         slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3657                 }
3658                 if (slave == curr_arp_slave)
3659                         found = true;
3660         }
3661
3662         if (!new_slave && before)
3663                 new_slave = before;
3664
3665         if (!new_slave)
3666                 goto check_state;
3667
3668         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3669                                   BOND_SLAVE_NOTIFY_LATER);
3670         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3671         bond_send_validate(bond, new_slave);
3672         new_slave->last_link_up = jiffies;
3673         rcu_assign_pointer(bond->current_arp_slave, new_slave);
3674
3675 check_state:
3676         bond_for_each_slave_rcu(bond, slave, iter) {
3677                 if (slave->should_notify || slave->should_notify_link) {
3678                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3679                         break;
3680                 }
3681         }
3682         return should_notify_rtnl;
3683 }
3684
3685 static void bond_activebackup_arp_mon(struct bonding *bond)
3686 {
3687         bool should_notify_peers = false;
3688         bool should_notify_rtnl = false;
3689         int delta_in_ticks;
3690
3691         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3692
3693         if (!bond_has_slaves(bond))
3694                 goto re_arm;
3695
3696         rcu_read_lock();
3697
3698         should_notify_peers = bond_should_notify_peers(bond);
3699
3700         if (bond_ab_arp_inspect(bond)) {
3701                 rcu_read_unlock();
3702
3703                 /* Race avoidance with bond_close flush of workqueue */
3704                 if (!rtnl_trylock()) {
3705                         delta_in_ticks = 1;
3706                         should_notify_peers = false;
3707                         goto re_arm;
3708                 }
3709
3710                 bond_ab_arp_commit(bond);
3711
3712                 rtnl_unlock();
3713                 rcu_read_lock();
3714         }
3715
3716         should_notify_rtnl = bond_ab_arp_probe(bond);
3717         rcu_read_unlock();
3718
3719 re_arm:
3720         if (bond->params.arp_interval)
3721                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3722
3723         if (should_notify_peers || should_notify_rtnl) {
3724                 if (!rtnl_trylock())
3725                         return;
3726
3727                 if (should_notify_peers) {
3728                         bond->send_peer_notif--;
3729                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3730                                                  bond->dev);
3731                 }
3732                 if (should_notify_rtnl) {
3733                         bond_slave_state_notify(bond);
3734                         bond_slave_link_notify(bond);
3735                 }
3736
3737                 rtnl_unlock();
3738         }
3739 }
3740
3741 static void bond_arp_monitor(struct work_struct *work)
3742 {
3743         struct bonding *bond = container_of(work, struct bonding,
3744                                             arp_work.work);
3745
3746         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3747                 bond_activebackup_arp_mon(bond);
3748         else
3749                 bond_loadbalance_arp_mon(bond);
3750 }
3751
3752 /*-------------------------- netdev event handling --------------------------*/
3753
3754 /* Change device name */
3755 static int bond_event_changename(struct bonding *bond)
3756 {
3757         bond_remove_proc_entry(bond);
3758         bond_create_proc_entry(bond);
3759
3760         bond_debug_reregister(bond);
3761
3762         return NOTIFY_DONE;
3763 }
3764
3765 static int bond_master_netdev_event(unsigned long event,
3766                                     struct net_device *bond_dev)
3767 {
3768         struct bonding *event_bond = netdev_priv(bond_dev);
3769
3770         netdev_dbg(bond_dev, "%s called\n", __func__);
3771
3772         switch (event) {
3773         case NETDEV_CHANGENAME:
3774                 return bond_event_changename(event_bond);
3775         case NETDEV_UNREGISTER:
3776                 bond_remove_proc_entry(event_bond);
3777 #ifdef CONFIG_XFRM_OFFLOAD
3778                 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true);
3779 #endif /* CONFIG_XFRM_OFFLOAD */
3780                 break;
3781         case NETDEV_REGISTER:
3782                 bond_create_proc_entry(event_bond);
3783                 break;
3784         default:
3785                 break;
3786         }
3787
3788         return NOTIFY_DONE;
3789 }
3790
3791 static int bond_slave_netdev_event(unsigned long event,
3792                                    struct net_device *slave_dev)
3793 {
3794         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3795         struct bonding *bond;
3796         struct net_device *bond_dev;
3797
3798         /* A netdev event can be generated while enslaving a device
3799          * before netdev_rx_handler_register is called in which case
3800          * slave will be NULL
3801          */
3802         if (!slave) {
3803                 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3804                 return NOTIFY_DONE;
3805         }
3806
3807         bond_dev = slave->bond->dev;
3808         bond = slave->bond;
3809         primary = rtnl_dereference(bond->primary_slave);
3810
3811         slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3812
3813         switch (event) {
3814         case NETDEV_UNREGISTER:
3815                 if (bond_dev->type != ARPHRD_ETHER)
3816                         bond_release_and_destroy(bond_dev, slave_dev);
3817                 else
3818                         __bond_release_one(bond_dev, slave_dev, false, true);
3819                 break;
3820         case NETDEV_UP:
3821         case NETDEV_CHANGE:
3822                 /* For 802.3ad mode only:
3823                  * Getting invalid Speed/Duplex values here will put slave
3824                  * in weird state. Mark it as link-fail if the link was
3825                  * previously up or link-down if it hasn't yet come up, and
3826                  * let link-monitoring (miimon) set it right when correct
3827                  * speeds/duplex are available.
3828                  */
3829                 if (bond_update_speed_duplex(slave) &&
3830                     BOND_MODE(bond) == BOND_MODE_8023AD) {
3831                         if (slave->last_link_up)
3832                                 slave->link = BOND_LINK_FAIL;
3833                         else
3834                                 slave->link = BOND_LINK_DOWN;
3835                 }
3836
3837                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3838                         bond_3ad_adapter_speed_duplex_changed(slave);
3839                 fallthrough;
3840         case NETDEV_DOWN:
3841                 /* Refresh slave-array if applicable!
3842                  * If the setup does not use miimon or arpmon (mode-specific!),
3843                  * then these events will not cause the slave-array to be
3844                  * refreshed. This will cause xmit to use a slave that is not
3845                  * usable. Avoid such situation by refeshing the array at these
3846                  * events. If these (miimon/arpmon) parameters are configured
3847                  * then array gets refreshed twice and that should be fine!
3848                  */
3849                 if (bond_mode_can_use_xmit_hash(bond))
3850                         bond_update_slave_arr(bond, NULL);
3851                 break;
3852         case NETDEV_CHANGEMTU:
3853                 /* TODO: Should slaves be allowed to
3854                  * independently alter their MTU?  For
3855                  * an active-backup bond, slaves need
3856                  * not be the same type of device, so
3857                  * MTUs may vary.  For other modes,
3858                  * slaves arguably should have the
3859                  * same MTUs. To do this, we'd need to
3860                  * take over the slave's change_mtu
3861                  * function for the duration of their
3862                  * servitude.
3863                  */
3864                 break;
3865         case NETDEV_CHANGENAME:
3866                 /* we don't care if we don't have primary set */
3867                 if (!bond_uses_primary(bond) ||
3868                     !bond->params.primary[0])
3869                         break;
3870
3871                 if (slave == primary) {
3872                         /* slave's name changed - he's no longer primary */
3873                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3874                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3875                         /* we have a new primary slave */
3876                         rcu_assign_pointer(bond->primary_slave, slave);
3877                 } else { /* we didn't change primary - exit */
3878                         break;
3879                 }
3880
3881                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3882                             primary ? slave_dev->name : "none");
3883
3884                 block_netpoll_tx();
3885                 bond_select_active_slave(bond);
3886                 unblock_netpoll_tx();
3887                 break;
3888         case NETDEV_FEAT_CHANGE:
3889                 bond_compute_features(bond);
3890                 break;
3891         case NETDEV_RESEND_IGMP:
3892                 /* Propagate to master device */
3893                 call_netdevice_notifiers(event, slave->bond->dev);
3894                 break;
3895         default:
3896                 break;
3897         }
3898
3899         return NOTIFY_DONE;
3900 }
3901
3902 /* bond_netdev_event: handle netdev notifier chain events.
3903  *
3904  * This function receives events for the netdev chain.  The caller (an
3905  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3906  * locks for us to safely manipulate the slave devices (RTNL lock,
3907  * dev_probe_lock).
3908  */
3909 static int bond_netdev_event(struct notifier_block *this,
3910                              unsigned long event, void *ptr)
3911 {
3912         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3913
3914         netdev_dbg(event_dev, "%s received %s\n",
3915                    __func__, netdev_cmd_to_name(event));
3916
3917         if (!(event_dev->priv_flags & IFF_BONDING))
3918                 return NOTIFY_DONE;
3919
3920         if (event_dev->flags & IFF_MASTER) {
3921                 int ret;
3922
3923                 ret = bond_master_netdev_event(event, event_dev);
3924                 if (ret != NOTIFY_DONE)
3925                         return ret;
3926         }
3927
3928         if (event_dev->flags & IFF_SLAVE)
3929                 return bond_slave_netdev_event(event, event_dev);
3930
3931         return NOTIFY_DONE;
3932 }
3933
3934 static struct notifier_block bond_netdev_notifier = {
3935         .notifier_call = bond_netdev_event,
3936 };
3937
3938 /*---------------------------- Hashing Policies -----------------------------*/
3939
3940 /* Helper to access data in a packet, with or without a backing skb.
3941  * If skb is given the data is linearized if necessary via pskb_may_pull.
3942  */
3943 static inline const void *bond_pull_data(struct sk_buff *skb,
3944                                          const void *data, int hlen, int n)
3945 {
3946         if (likely(n <= hlen))
3947                 return data;
3948         else if (skb && likely(pskb_may_pull(skb, n)))
3949                 return skb->head;
3950
3951         return NULL;
3952 }
3953
3954 /* L2 hash helper */
3955 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)
3956 {
3957         struct ethhdr *ep;
3958
3959         data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));
3960         if (!data)
3961                 return 0;
3962
3963         ep = (struct ethhdr *)(data + mhoff);
3964         return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto);
3965 }
3966
3967 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data,
3968                          int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34)
3969 {
3970         const struct ipv6hdr *iph6;
3971         const struct iphdr *iph;
3972
3973         if (l2_proto == htons(ETH_P_IP)) {
3974                 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph));
3975                 if (!data)
3976                         return false;
3977
3978                 iph = (const struct iphdr *)(data + *nhoff);
3979                 iph_to_flow_copy_v4addrs(fk, iph);
3980                 *nhoff += iph->ihl << 2;
3981                 if (!ip_is_fragment(iph))
3982                         *ip_proto = iph->protocol;
3983         } else if (l2_proto == htons(ETH_P_IPV6)) {
3984                 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6));
3985                 if (!data)
3986                         return false;
3987
3988                 iph6 = (const struct ipv6hdr *)(data + *nhoff);
3989                 iph_to_flow_copy_v6addrs(fk, iph6);
3990                 *nhoff += sizeof(*iph6);
3991                 *ip_proto = iph6->nexthdr;
3992         } else {
3993                 return false;
3994         }
3995
3996         if (l34 && *ip_proto >= 0)
3997                 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen);
3998
3999         return true;
4000 }
4001
4002 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)
4003 {
4004         u32 srcmac_vendor = 0, srcmac_dev = 0;
4005         struct ethhdr *mac_hdr;
4006         u16 vlan = 0;
4007         int i;
4008
4009         data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));
4010         if (!data)
4011                 return 0;
4012         mac_hdr = (struct ethhdr *)(data + mhoff);
4013
4014         for (i = 0; i < 3; i++)
4015                 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i];
4016
4017         for (i = 3; i < ETH_ALEN; i++)
4018                 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i];
4019
4020         if (skb && skb_vlan_tag_present(skb))
4021                 vlan = skb_vlan_tag_get(skb);
4022
4023         return vlan ^ srcmac_vendor ^ srcmac_dev;
4024 }
4025
4026 /* Extract the appropriate headers based on bond's xmit policy */
4027 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data,
4028                               __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk)
4029 {
4030         bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
4031         int ip_proto = -1;
4032
4033         switch (bond->params.xmit_policy) {
4034         case BOND_XMIT_POLICY_ENCAP23:
4035         case BOND_XMIT_POLICY_ENCAP34:
4036                 memset(fk, 0, sizeof(*fk));
4037                 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
4038                                           fk, data, l2_proto, nhoff, hlen, 0);
4039         default:
4040                 break;
4041         }
4042
4043         fk->ports.ports = 0;
4044         memset(&fk->icmp, 0, sizeof(fk->icmp));
4045         if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34))
4046                 return false;
4047
4048         /* ICMP error packets contains at least 8 bytes of the header
4049          * of the packet which generated the error. Use this information
4050          * to correlate ICMP error packets within the same flow which
4051          * generated the error.
4052          */
4053         if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) {
4054                 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen);
4055                 if (ip_proto == IPPROTO_ICMP) {
4056                         if (!icmp_is_err(fk->icmp.type))
4057                                 return true;
4058
4059                         nhoff += sizeof(struct icmphdr);
4060                 } else if (ip_proto == IPPROTO_ICMPV6) {
4061                         if (!icmpv6_is_err(fk->icmp.type))
4062                                 return true;
4063
4064                         nhoff += sizeof(struct icmp6hdr);
4065                 }
4066                 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34);
4067         }
4068
4069         return true;
4070 }
4071
4072 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy)
4073 {
4074         hash ^= (__force u32)flow_get_u32_dst(flow) ^
4075                 (__force u32)flow_get_u32_src(flow);
4076         hash ^= (hash >> 16);
4077         hash ^= (hash >> 8);
4078
4079         /* discard lowest hash bit to deal with the common even ports pattern */
4080         if (xmit_policy == BOND_XMIT_POLICY_LAYER34 ||
4081                 xmit_policy == BOND_XMIT_POLICY_ENCAP34)
4082                 return hash >> 1;
4083
4084         return hash;
4085 }
4086
4087 /* Generate hash based on xmit policy. If @skb is given it is used to linearize
4088  * the data as required, but this function can be used without it if the data is
4089  * known to be linear (e.g. with xdp_buff).
4090  */
4091 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data,
4092                             __be16 l2_proto, int mhoff, int nhoff, int hlen)
4093 {
4094         struct flow_keys flow;
4095         u32 hash;
4096
4097         if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC)
4098                 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen);
4099
4100         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
4101             !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow))
4102                 return bond_eth_hash(skb, data, mhoff, hlen);
4103
4104         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
4105             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
4106                 hash = bond_eth_hash(skb, data, mhoff, hlen);
4107         } else {
4108                 if (flow.icmp.id)
4109                         memcpy(&hash, &flow.icmp, sizeof(hash));
4110                 else
4111                         memcpy(&hash, &flow.ports.ports, sizeof(hash));
4112         }
4113
4114         return bond_ip_hash(hash, &flow, bond->params.xmit_policy);
4115 }
4116
4117 /**
4118  * bond_xmit_hash - generate a hash value based on the xmit policy
4119  * @bond: bonding device
4120  * @skb: buffer to use for headers
4121  *
4122  * This function will extract the necessary headers from the skb buffer and use
4123  * them to generate a hash based on the xmit_policy set in the bonding device
4124  */
4125 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
4126 {
4127         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
4128             skb->l4_hash)
4129                 return skb->hash;
4130
4131         return __bond_xmit_hash(bond, skb, skb->data, skb->protocol,
4132                                 skb_mac_offset(skb), skb_network_offset(skb),
4133                                 skb_headlen(skb));
4134 }
4135
4136 /**
4137  * bond_xmit_hash_xdp - generate a hash value based on the xmit policy
4138  * @bond: bonding device
4139  * @xdp: buffer to use for headers
4140  *
4141  * The XDP variant of bond_xmit_hash.
4142  */
4143 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp)
4144 {
4145         struct ethhdr *eth;
4146
4147         if (xdp->data + sizeof(struct ethhdr) > xdp->data_end)
4148                 return 0;
4149
4150         eth = (struct ethhdr *)xdp->data;
4151
4152         return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0,
4153                                 sizeof(struct ethhdr), xdp->data_end - xdp->data);
4154 }
4155
4156 /*-------------------------- Device entry points ----------------------------*/
4157
4158 void bond_work_init_all(struct bonding *bond)
4159 {
4160         INIT_DELAYED_WORK(&bond->mcast_work,
4161                           bond_resend_igmp_join_requests_delayed);
4162         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
4163         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
4164         INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
4165         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
4166         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
4167 }
4168
4169 static void bond_work_cancel_all(struct bonding *bond)
4170 {
4171         cancel_delayed_work_sync(&bond->mii_work);
4172         cancel_delayed_work_sync(&bond->arp_work);
4173         cancel_delayed_work_sync(&bond->alb_work);
4174         cancel_delayed_work_sync(&bond->ad_work);
4175         cancel_delayed_work_sync(&bond->mcast_work);
4176         cancel_delayed_work_sync(&bond->slave_arr_work);
4177 }
4178
4179 static int bond_open(struct net_device *bond_dev)
4180 {
4181         struct bonding *bond = netdev_priv(bond_dev);
4182         struct list_head *iter;
4183         struct slave *slave;
4184
4185         if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) {
4186                 bond->rr_tx_counter = alloc_percpu(u32);
4187                 if (!bond->rr_tx_counter)
4188                         return -ENOMEM;
4189         }
4190
4191         /* reset slave->backup and slave->inactive */
4192         if (bond_has_slaves(bond)) {
4193                 bond_for_each_slave(bond, slave, iter) {
4194                         if (bond_uses_primary(bond) &&
4195                             slave != rcu_access_pointer(bond->curr_active_slave)) {
4196                                 bond_set_slave_inactive_flags(slave,
4197                                                               BOND_SLAVE_NOTIFY_NOW);
4198                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
4199                                 bond_set_slave_active_flags(slave,
4200                                                             BOND_SLAVE_NOTIFY_NOW);
4201                         }
4202                 }
4203         }
4204
4205         if (bond_is_lb(bond)) {
4206                 /* bond_alb_initialize must be called before the timer
4207                  * is started.
4208                  */
4209                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
4210                         return -ENOMEM;
4211                 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
4212                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
4213         }
4214
4215         if (bond->params.miimon)  /* link check interval, in milliseconds. */
4216                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
4217
4218         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
4219                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
4220                 bond->recv_probe = bond_rcv_validate;
4221         }
4222
4223         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4224                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
4225                 /* register to receive LACPDUs */
4226                 bond->recv_probe = bond_3ad_lacpdu_recv;
4227                 bond_3ad_initiate_agg_selection(bond, 1);
4228
4229                 bond_for_each_slave(bond, slave, iter)
4230                         dev_mc_add(slave->dev, lacpdu_mcast_addr);
4231         }
4232
4233         if (bond_mode_can_use_xmit_hash(bond))
4234                 bond_update_slave_arr(bond, NULL);
4235
4236         return 0;
4237 }
4238
4239 static int bond_close(struct net_device *bond_dev)
4240 {
4241         struct bonding *bond = netdev_priv(bond_dev);
4242         struct slave *slave;
4243
4244         bond_work_cancel_all(bond);
4245         bond->send_peer_notif = 0;
4246         if (bond_is_lb(bond))
4247                 bond_alb_deinitialize(bond);
4248         bond->recv_probe = NULL;
4249
4250         if (bond_uses_primary(bond)) {
4251                 rcu_read_lock();
4252                 slave = rcu_dereference(bond->curr_active_slave);
4253                 if (slave)
4254                         bond_hw_addr_flush(bond_dev, slave->dev);
4255                 rcu_read_unlock();
4256         } else {
4257                 struct list_head *iter;
4258
4259                 bond_for_each_slave(bond, slave, iter)
4260                         bond_hw_addr_flush(bond_dev, slave->dev);
4261         }
4262
4263         return 0;
4264 }
4265
4266 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
4267  * that some drivers can provide 32bit values only.
4268  */
4269 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
4270                             const struct rtnl_link_stats64 *_new,
4271                             const struct rtnl_link_stats64 *_old)
4272 {
4273         const u64 *new = (const u64 *)_new;
4274         const u64 *old = (const u64 *)_old;
4275         u64 *res = (u64 *)_res;
4276         int i;
4277
4278         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
4279                 u64 nv = new[i];
4280                 u64 ov = old[i];
4281                 s64 delta = nv - ov;
4282
4283                 /* detects if this particular field is 32bit only */
4284                 if (((nv | ov) >> 32) == 0)
4285                         delta = (s64)(s32)((u32)nv - (u32)ov);
4286
4287                 /* filter anomalies, some drivers reset their stats
4288                  * at down/up events.
4289                  */
4290                 if (delta > 0)
4291                         res[i] += delta;
4292         }
4293 }
4294
4295 #ifdef CONFIG_LOCKDEP
4296 static int bond_get_lowest_level_rcu(struct net_device *dev)
4297 {
4298         struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
4299         struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
4300         int cur = 0, max = 0;
4301
4302         now = dev;
4303         iter = &dev->adj_list.lower;
4304
4305         while (1) {
4306                 next = NULL;
4307                 while (1) {
4308                         ldev = netdev_next_lower_dev_rcu(now, &iter);
4309                         if (!ldev)
4310                                 break;
4311
4312                         next = ldev;
4313                         niter = &ldev->adj_list.lower;
4314                         dev_stack[cur] = now;
4315                         iter_stack[cur++] = iter;
4316                         if (max <= cur)
4317                                 max = cur;
4318                         break;
4319                 }
4320
4321                 if (!next) {
4322                         if (!cur)
4323                                 return max;
4324                         next = dev_stack[--cur];
4325                         niter = iter_stack[cur];
4326                 }
4327
4328                 now = next;
4329                 iter = niter;
4330         }
4331
4332         return max;
4333 }
4334 #endif
4335
4336 static void bond_get_stats(struct net_device *bond_dev,
4337                            struct rtnl_link_stats64 *stats)
4338 {
4339         struct bonding *bond = netdev_priv(bond_dev);
4340         struct rtnl_link_stats64 temp;
4341         struct list_head *iter;
4342         struct slave *slave;
4343         int nest_level = 0;
4344
4345
4346         rcu_read_lock();
4347 #ifdef CONFIG_LOCKDEP
4348         nest_level = bond_get_lowest_level_rcu(bond_dev);
4349 #endif
4350
4351         spin_lock_nested(&bond->stats_lock, nest_level);
4352         memcpy(stats, &bond->bond_stats, sizeof(*stats));
4353
4354         bond_for_each_slave_rcu(bond, slave, iter) {
4355                 const struct rtnl_link_stats64 *new =
4356                         dev_get_stats(slave->dev, &temp);
4357
4358                 bond_fold_stats(stats, new, &slave->slave_stats);
4359
4360                 /* save off the slave stats for the next run */
4361                 memcpy(&slave->slave_stats, new, sizeof(*new));
4362         }
4363
4364         memcpy(&bond->bond_stats, stats, sizeof(*stats));
4365         spin_unlock(&bond->stats_lock);
4366         rcu_read_unlock();
4367 }
4368
4369 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
4370 {
4371         struct bonding *bond = netdev_priv(bond_dev);
4372         struct mii_ioctl_data *mii = NULL;
4373         const struct net_device_ops *ops;
4374         struct net_device *real_dev;
4375         struct hwtstamp_config cfg;
4376         struct ifreq ifrr;
4377         int res = 0;
4378
4379         netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd);
4380
4381         switch (cmd) {
4382         case SIOCGMIIPHY:
4383                 mii = if_mii(ifr);
4384                 if (!mii)
4385                         return -EINVAL;
4386
4387                 mii->phy_id = 0;
4388                 fallthrough;
4389         case SIOCGMIIREG:
4390                 /* We do this again just in case we were called by SIOCGMIIREG
4391                  * instead of SIOCGMIIPHY.
4392                  */
4393                 mii = if_mii(ifr);
4394                 if (!mii)
4395                         return -EINVAL;
4396
4397                 if (mii->reg_num == 1) {
4398                         mii->val_out = 0;
4399                         if (netif_carrier_ok(bond->dev))
4400                                 mii->val_out = BMSR_LSTATUS;
4401                 }
4402
4403                 break;
4404         case SIOCSHWTSTAMP:
4405                 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
4406                         return -EFAULT;
4407
4408                 if (!(cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX))
4409                         return -EOPNOTSUPP;
4410
4411                 fallthrough;
4412         case SIOCGHWTSTAMP:
4413                 real_dev = bond_option_active_slave_get_rcu(bond);
4414                 if (!real_dev)
4415                         return -EOPNOTSUPP;
4416
4417                 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
4418                 ifrr.ifr_ifru = ifr->ifr_ifru;
4419
4420                 ops = real_dev->netdev_ops;
4421                 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) {
4422                         res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
4423                         if (res)
4424                                 return res;
4425
4426                         ifr->ifr_ifru = ifrr.ifr_ifru;
4427                         if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
4428                                 return -EFAULT;
4429
4430                         /* Set the BOND_PHC_INDEX flag to notify user space */
4431                         cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX;
4432
4433                         return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ?
4434                                 -EFAULT : 0;
4435                 }
4436                 fallthrough;
4437         default:
4438                 res = -EOPNOTSUPP;
4439         }
4440
4441         return res;
4442 }
4443
4444 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
4445 {
4446         struct bonding *bond = netdev_priv(bond_dev);
4447         struct net_device *slave_dev = NULL;
4448         struct ifbond k_binfo;
4449         struct ifbond __user *u_binfo = NULL;
4450         struct ifslave k_sinfo;
4451         struct ifslave __user *u_sinfo = NULL;
4452         struct bond_opt_value newval;
4453         struct net *net;
4454         int res = 0;
4455
4456         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
4457
4458         switch (cmd) {
4459         case SIOCBONDINFOQUERY:
4460                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
4461
4462                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
4463                         return -EFAULT;
4464
4465                 bond_info_query(bond_dev, &k_binfo);
4466                 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
4467                         return -EFAULT;
4468
4469                 return 0;
4470         case SIOCBONDSLAVEINFOQUERY:
4471                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
4472
4473                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
4474                         return -EFAULT;
4475
4476                 res = bond_slave_info_query(bond_dev, &k_sinfo);
4477                 if (res == 0 &&
4478                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
4479                         return -EFAULT;
4480
4481                 return res;
4482         default:
4483                 break;
4484         }
4485
4486         net = dev_net(bond_dev);
4487
4488         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4489                 return -EPERM;
4490
4491         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
4492
4493         slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
4494
4495         if (!slave_dev)
4496                 return -ENODEV;
4497
4498         switch (cmd) {
4499         case SIOCBONDENSLAVE:
4500                 res = bond_enslave(bond_dev, slave_dev, NULL);
4501                 break;
4502         case SIOCBONDRELEASE:
4503                 res = bond_release(bond_dev, slave_dev);
4504                 break;
4505         case SIOCBONDSETHWADDR:
4506                 res = bond_set_dev_addr(bond_dev, slave_dev);
4507                 break;
4508         case SIOCBONDCHANGEACTIVE:
4509                 bond_opt_initstr(&newval, slave_dev->name);
4510                 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
4511                                             &newval);
4512                 break;
4513         default:
4514                 res = -EOPNOTSUPP;
4515         }
4516
4517         return res;
4518 }
4519
4520 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr,
4521                                void __user *data, int cmd)
4522 {
4523         struct ifreq ifrdata = { .ifr_data = data };
4524
4525         switch (cmd) {
4526         case BOND_INFO_QUERY_OLD:
4527                 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY);
4528         case BOND_SLAVE_INFO_QUERY_OLD:
4529                 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY);
4530         case BOND_ENSLAVE_OLD:
4531                 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE);
4532         case BOND_RELEASE_OLD:
4533                 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE);
4534         case BOND_SETHWADDR_OLD:
4535                 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR);
4536         case BOND_CHANGE_ACTIVE_OLD:
4537                 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE);
4538         }
4539
4540         return -EOPNOTSUPP;
4541 }
4542
4543 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
4544 {
4545         struct bonding *bond = netdev_priv(bond_dev);
4546
4547         if (change & IFF_PROMISC)
4548                 bond_set_promiscuity(bond,
4549                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
4550
4551         if (change & IFF_ALLMULTI)
4552                 bond_set_allmulti(bond,
4553                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
4554 }
4555
4556 static void bond_set_rx_mode(struct net_device *bond_dev)
4557 {
4558         struct bonding *bond = netdev_priv(bond_dev);
4559         struct list_head *iter;
4560         struct slave *slave;
4561
4562         rcu_read_lock();
4563         if (bond_uses_primary(bond)) {
4564                 slave = rcu_dereference(bond->curr_active_slave);
4565                 if (slave) {
4566                         dev_uc_sync(slave->dev, bond_dev);
4567                         dev_mc_sync(slave->dev, bond_dev);
4568                 }
4569         } else {
4570                 bond_for_each_slave_rcu(bond, slave, iter) {
4571                         dev_uc_sync_multiple(slave->dev, bond_dev);
4572                         dev_mc_sync_multiple(slave->dev, bond_dev);
4573                 }
4574         }
4575         rcu_read_unlock();
4576 }
4577
4578 static int bond_neigh_init(struct neighbour *n)
4579 {
4580         struct bonding *bond = netdev_priv(n->dev);
4581         const struct net_device_ops *slave_ops;
4582         struct neigh_parms parms;
4583         struct slave *slave;
4584         int ret = 0;
4585
4586         rcu_read_lock();
4587         slave = bond_first_slave_rcu(bond);
4588         if (!slave)
4589                 goto out;
4590         slave_ops = slave->dev->netdev_ops;
4591         if (!slave_ops->ndo_neigh_setup)
4592                 goto out;
4593
4594         /* TODO: find another way [1] to implement this.
4595          * Passing a zeroed structure is fragile,
4596          * but at least we do not pass garbage.
4597          *
4598          * [1] One way would be that ndo_neigh_setup() never touch
4599          *     struct neigh_parms, but propagate the new neigh_setup()
4600          *     back to ___neigh_create() / neigh_parms_alloc()
4601          */
4602         memset(&parms, 0, sizeof(parms));
4603         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
4604
4605         if (ret)
4606                 goto out;
4607
4608         if (parms.neigh_setup)
4609                 ret = parms.neigh_setup(n);
4610 out:
4611         rcu_read_unlock();
4612         return ret;
4613 }
4614
4615 /* The bonding ndo_neigh_setup is called at init time beofre any
4616  * slave exists. So we must declare proxy setup function which will
4617  * be used at run time to resolve the actual slave neigh param setup.
4618  *
4619  * It's also called by master devices (such as vlans) to setup their
4620  * underlying devices. In that case - do nothing, we're already set up from
4621  * our init.
4622  */
4623 static int bond_neigh_setup(struct net_device *dev,
4624                             struct neigh_parms *parms)
4625 {
4626         /* modify only our neigh_parms */
4627         if (parms->dev == dev)
4628                 parms->neigh_setup = bond_neigh_init;
4629
4630         return 0;
4631 }
4632
4633 /* Change the MTU of all of a master's slaves to match the master */
4634 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4635 {
4636         struct bonding *bond = netdev_priv(bond_dev);
4637         struct slave *slave, *rollback_slave;
4638         struct list_head *iter;
4639         int res = 0;
4640
4641         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
4642
4643         bond_for_each_slave(bond, slave, iter) {
4644                 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
4645                            slave, slave->dev->netdev_ops->ndo_change_mtu);
4646
4647                 res = dev_set_mtu(slave->dev, new_mtu);
4648
4649                 if (res) {
4650                         /* If we failed to set the slave's mtu to the new value
4651                          * we must abort the operation even in ACTIVE_BACKUP
4652                          * mode, because if we allow the backup slaves to have
4653                          * different mtu values than the active slave we'll
4654                          * need to change their mtu when doing a failover. That
4655                          * means changing their mtu from timer context, which
4656                          * is probably not a good idea.
4657                          */
4658                         slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
4659                                   res, new_mtu);
4660                         goto unwind;
4661                 }
4662         }
4663
4664         bond_dev->mtu = new_mtu;
4665
4666         return 0;
4667
4668 unwind:
4669         /* unwind from head to the slave that failed */
4670         bond_for_each_slave(bond, rollback_slave, iter) {
4671                 int tmp_res;
4672
4673                 if (rollback_slave == slave)
4674                         break;
4675
4676                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
4677                 if (tmp_res)
4678                         slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
4679                                   tmp_res);
4680         }
4681
4682         return res;
4683 }
4684
4685 /* Change HW address
4686  *
4687  * Note that many devices must be down to change the HW address, and
4688  * downing the master releases all slaves.  We can make bonds full of
4689  * bonding devices to test this, however.
4690  */
4691 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4692 {
4693         struct bonding *bond = netdev_priv(bond_dev);
4694         struct slave *slave, *rollback_slave;
4695         struct sockaddr_storage *ss = addr, tmp_ss;
4696         struct list_head *iter;
4697         int res = 0;
4698
4699         if (BOND_MODE(bond) == BOND_MODE_ALB)
4700                 return bond_alb_set_mac_address(bond_dev, addr);
4701
4702
4703         netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4704
4705         /* If fail_over_mac is enabled, do nothing and return success.
4706          * Returning an error causes ifenslave to fail.
4707          */
4708         if (bond->params.fail_over_mac &&
4709             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4710                 return 0;
4711
4712         if (!is_valid_ether_addr(ss->__data))
4713                 return -EADDRNOTAVAIL;
4714
4715         bond_for_each_slave(bond, slave, iter) {
4716                 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4717                           __func__, slave);
4718                 res = dev_set_mac_address(slave->dev, addr, NULL);
4719                 if (res) {
4720                         /* TODO: consider downing the slave
4721                          * and retry ?
4722                          * User should expect communications
4723                          * breakage anyway until ARP finish
4724                          * updating, so...
4725                          */
4726                         slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4727                                   __func__, res);
4728                         goto unwind;
4729                 }
4730         }
4731
4732         /* success */
4733         dev_addr_set(bond_dev, ss->__data);
4734         return 0;
4735
4736 unwind:
4737         memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4738         tmp_ss.ss_family = bond_dev->type;
4739
4740         /* unwind from head to the slave that failed */
4741         bond_for_each_slave(bond, rollback_slave, iter) {
4742                 int tmp_res;
4743
4744                 if (rollback_slave == slave)
4745                         break;
4746
4747                 tmp_res = dev_set_mac_address(rollback_slave->dev,
4748                                               (struct sockaddr *)&tmp_ss, NULL);
4749                 if (tmp_res) {
4750                         slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4751                                    __func__, tmp_res);
4752                 }
4753         }
4754
4755         return res;
4756 }
4757
4758 /**
4759  * bond_get_slave_by_id - get xmit slave with slave_id
4760  * @bond: bonding device that is transmitting
4761  * @slave_id: slave id up to slave_cnt-1 through which to transmit
4762  *
4763  * This function tries to get slave with slave_id but in case
4764  * it fails, it tries to find the first available slave for transmission.
4765  */
4766 static struct slave *bond_get_slave_by_id(struct bonding *bond,
4767                                           int slave_id)
4768 {
4769         struct list_head *iter;
4770         struct slave *slave;
4771         int i = slave_id;
4772
4773         /* Here we start from the slave with slave_id */
4774         bond_for_each_slave_rcu(bond, slave, iter) {
4775                 if (--i < 0) {
4776                         if (bond_slave_can_tx(slave))
4777                                 return slave;
4778                 }
4779         }
4780
4781         /* Here we start from the first slave up to slave_id */
4782         i = slave_id;
4783         bond_for_each_slave_rcu(bond, slave, iter) {
4784                 if (--i < 0)
4785                         break;
4786                 if (bond_slave_can_tx(slave))
4787                         return slave;
4788         }
4789         /* no slave that can tx has been found */
4790         return NULL;
4791 }
4792
4793 /**
4794  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4795  * @bond: bonding device to use
4796  *
4797  * Based on the value of the bonding device's packets_per_slave parameter
4798  * this function generates a slave id, which is usually used as the next
4799  * slave to transmit through.
4800  */
4801 static u32 bond_rr_gen_slave_id(struct bonding *bond)
4802 {
4803         u32 slave_id;
4804         struct reciprocal_value reciprocal_packets_per_slave;
4805         int packets_per_slave = bond->params.packets_per_slave;
4806
4807         switch (packets_per_slave) {
4808         case 0:
4809                 slave_id = prandom_u32();
4810                 break;
4811         case 1:
4812                 slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
4813                 break;
4814         default:
4815                 reciprocal_packets_per_slave =
4816                         bond->params.reciprocal_packets_per_slave;
4817                 slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
4818                 slave_id = reciprocal_divide(slave_id,
4819                                              reciprocal_packets_per_slave);
4820                 break;
4821         }
4822
4823         return slave_id;
4824 }
4825
4826 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4827                                                     struct sk_buff *skb)
4828 {
4829         struct slave *slave;
4830         int slave_cnt;
4831         u32 slave_id;
4832
4833         /* Start with the curr_active_slave that joined the bond as the
4834          * default for sending IGMP traffic.  For failover purposes one
4835          * needs to maintain some consistency for the interface that will
4836          * send the join/membership reports.  The curr_active_slave found
4837          * will send all of this type of traffic.
4838          */
4839         if (skb->protocol == htons(ETH_P_IP)) {
4840                 int noff = skb_network_offset(skb);
4841                 struct iphdr *iph;
4842
4843                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4844                         goto non_igmp;
4845
4846                 iph = ip_hdr(skb);
4847                 if (iph->protocol == IPPROTO_IGMP) {
4848                         slave = rcu_dereference(bond->curr_active_slave);
4849                         if (slave)
4850                                 return slave;
4851                         return bond_get_slave_by_id(bond, 0);
4852                 }
4853         }
4854
4855 non_igmp:
4856         slave_cnt = READ_ONCE(bond->slave_cnt);
4857         if (likely(slave_cnt)) {
4858                 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4859                 return bond_get_slave_by_id(bond, slave_id);
4860         }
4861         return NULL;
4862 }
4863
4864 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond,
4865                                                         struct xdp_buff *xdp)
4866 {
4867         struct slave *slave;
4868         int slave_cnt;
4869         u32 slave_id;
4870         const struct ethhdr *eth;
4871         void *data = xdp->data;
4872
4873         if (data + sizeof(struct ethhdr) > xdp->data_end)
4874                 goto non_igmp;
4875
4876         eth = (struct ethhdr *)data;
4877         data += sizeof(struct ethhdr);
4878
4879         /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */
4880         if (eth->h_proto == htons(ETH_P_IP)) {
4881                 const struct iphdr *iph;
4882
4883                 if (data + sizeof(struct iphdr) > xdp->data_end)
4884                         goto non_igmp;
4885
4886                 iph = (struct iphdr *)data;
4887
4888                 if (iph->protocol == IPPROTO_IGMP) {
4889                         slave = rcu_dereference(bond->curr_active_slave);
4890                         if (slave)
4891                                 return slave;
4892                         return bond_get_slave_by_id(bond, 0);
4893                 }
4894         }
4895
4896 non_igmp:
4897         slave_cnt = READ_ONCE(bond->slave_cnt);
4898         if (likely(slave_cnt)) {
4899                 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4900                 return bond_get_slave_by_id(bond, slave_id);
4901         }
4902         return NULL;
4903 }
4904
4905 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4906                                         struct net_device *bond_dev)
4907 {
4908         struct bonding *bond = netdev_priv(bond_dev);
4909         struct slave *slave;
4910
4911         slave = bond_xmit_roundrobin_slave_get(bond, skb);
4912         if (likely(slave))
4913                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4914
4915         return bond_tx_drop(bond_dev, skb);
4916 }
4917
4918 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond)
4919 {
4920         return rcu_dereference(bond->curr_active_slave);
4921 }
4922
4923 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
4924  * the bond has a usable interface.
4925  */
4926 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4927                                           struct net_device *bond_dev)
4928 {
4929         struct bonding *bond = netdev_priv(bond_dev);
4930         struct slave *slave;
4931
4932         slave = bond_xmit_activebackup_slave_get(bond);
4933         if (slave)
4934                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4935
4936         return bond_tx_drop(bond_dev, skb);
4937 }
4938
4939 /* Use this to update slave_array when (a) it's not appropriate to update
4940  * slave_array right away (note that update_slave_array() may sleep)
4941  * and / or (b) RTNL is not held.
4942  */
4943 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4944 {
4945         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4946 }
4947
4948 /* Slave array work handler. Holds only RTNL */
4949 static void bond_slave_arr_handler(struct work_struct *work)
4950 {
4951         struct bonding *bond = container_of(work, struct bonding,
4952                                             slave_arr_work.work);
4953         int ret;
4954
4955         if (!rtnl_trylock())
4956                 goto err;
4957
4958         ret = bond_update_slave_arr(bond, NULL);
4959         rtnl_unlock();
4960         if (ret) {
4961                 pr_warn_ratelimited("Failed to update slave array from WT\n");
4962                 goto err;
4963         }
4964         return;
4965
4966 err:
4967         bond_slave_arr_work_rearm(bond, 1);
4968 }
4969
4970 static void bond_skip_slave(struct bond_up_slave *slaves,
4971                             struct slave *skipslave)
4972 {
4973         int idx;
4974
4975         /* Rare situation where caller has asked to skip a specific
4976          * slave but allocation failed (most likely!). BTW this is
4977          * only possible when the call is initiated from
4978          * __bond_release_one(). In this situation; overwrite the
4979          * skipslave entry in the array with the last entry from the
4980          * array to avoid a situation where the xmit path may choose
4981          * this to-be-skipped slave to send a packet out.
4982          */
4983         for (idx = 0; slaves && idx < slaves->count; idx++) {
4984                 if (skipslave == slaves->arr[idx]) {
4985                         slaves->arr[idx] =
4986                                 slaves->arr[slaves->count - 1];
4987                         slaves->count--;
4988                         break;
4989                 }
4990         }
4991 }
4992
4993 static void bond_set_slave_arr(struct bonding *bond,
4994                                struct bond_up_slave *usable_slaves,
4995                                struct bond_up_slave *all_slaves)
4996 {
4997         struct bond_up_slave *usable, *all;
4998
4999         usable = rtnl_dereference(bond->usable_slaves);
5000         rcu_assign_pointer(bond->usable_slaves, usable_slaves);
5001         kfree_rcu(usable, rcu);
5002
5003         all = rtnl_dereference(bond->all_slaves);
5004         rcu_assign_pointer(bond->all_slaves, all_slaves);
5005         kfree_rcu(all, rcu);
5006 }
5007
5008 static void bond_reset_slave_arr(struct bonding *bond)
5009 {
5010         struct bond_up_slave *usable, *all;
5011
5012         usable = rtnl_dereference(bond->usable_slaves);
5013         if (usable) {
5014                 RCU_INIT_POINTER(bond->usable_slaves, NULL);
5015                 kfree_rcu(usable, rcu);
5016         }
5017
5018         all = rtnl_dereference(bond->all_slaves);
5019         if (all) {
5020                 RCU_INIT_POINTER(bond->all_slaves, NULL);
5021                 kfree_rcu(all, rcu);
5022         }
5023 }
5024
5025 /* Build the usable slaves array in control path for modes that use xmit-hash
5026  * to determine the slave interface -
5027  * (a) BOND_MODE_8023AD
5028  * (b) BOND_MODE_XOR
5029  * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
5030  *
5031  * The caller is expected to hold RTNL only and NO other lock!
5032  */
5033 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
5034 {
5035         struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
5036         struct slave *slave;
5037         struct list_head *iter;
5038         int agg_id = 0;
5039         int ret = 0;
5040
5041         might_sleep();
5042
5043         usable_slaves = kzalloc(struct_size(usable_slaves, arr,
5044                                             bond->slave_cnt), GFP_KERNEL);
5045         all_slaves = kzalloc(struct_size(all_slaves, arr,
5046                                          bond->slave_cnt), GFP_KERNEL);
5047         if (!usable_slaves || !all_slaves) {
5048                 ret = -ENOMEM;
5049                 goto out;
5050         }
5051         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
5052                 struct ad_info ad_info;
5053
5054                 spin_lock_bh(&bond->mode_lock);
5055                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
5056                         spin_unlock_bh(&bond->mode_lock);
5057                         pr_debug("bond_3ad_get_active_agg_info failed\n");
5058                         /* No active aggragator means it's not safe to use
5059                          * the previous array.
5060                          */
5061                         bond_reset_slave_arr(bond);
5062                         goto out;
5063                 }
5064                 spin_unlock_bh(&bond->mode_lock);
5065                 agg_id = ad_info.aggregator_id;
5066         }
5067         bond_for_each_slave(bond, slave, iter) {
5068                 if (skipslave == slave)
5069                         continue;
5070
5071                 all_slaves->arr[all_slaves->count++] = slave;
5072                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
5073                         struct aggregator *agg;
5074
5075                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
5076                         if (!agg || agg->aggregator_identifier != agg_id)
5077                                 continue;
5078                 }
5079                 if (!bond_slave_can_tx(slave))
5080                         continue;
5081
5082                 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
5083                           usable_slaves->count);
5084
5085                 usable_slaves->arr[usable_slaves->count++] = slave;
5086         }
5087
5088         bond_set_slave_arr(bond, usable_slaves, all_slaves);
5089         return ret;
5090 out:
5091         if (ret != 0 && skipslave) {
5092                 bond_skip_slave(rtnl_dereference(bond->all_slaves),
5093                                 skipslave);
5094                 bond_skip_slave(rtnl_dereference(bond->usable_slaves),
5095                                 skipslave);
5096         }
5097         kfree_rcu(all_slaves, rcu);
5098         kfree_rcu(usable_slaves, rcu);
5099
5100         return ret;
5101 }
5102
5103 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
5104                                                  struct sk_buff *skb,
5105                                                  struct bond_up_slave *slaves)
5106 {
5107         struct slave *slave;
5108         unsigned int count;
5109         u32 hash;
5110
5111         hash = bond_xmit_hash(bond, skb);
5112         count = slaves ? READ_ONCE(slaves->count) : 0;
5113         if (unlikely(!count))
5114                 return NULL;
5115
5116         slave = slaves->arr[hash % count];
5117         return slave;
5118 }
5119
5120 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond,
5121                                                      struct xdp_buff *xdp)
5122 {
5123         struct bond_up_slave *slaves;
5124         unsigned int count;
5125         u32 hash;
5126
5127         hash = bond_xmit_hash_xdp(bond, xdp);
5128         slaves = rcu_dereference(bond->usable_slaves);
5129         count = slaves ? READ_ONCE(slaves->count) : 0;
5130         if (unlikely(!count))
5131                 return NULL;
5132
5133         return slaves->arr[hash % count];
5134 }
5135
5136 /* Use this Xmit function for 3AD as well as XOR modes. The current
5137  * usable slave array is formed in the control path. The xmit function
5138  * just calculates hash and sends the packet out.
5139  */
5140 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
5141                                      struct net_device *dev)
5142 {
5143         struct bonding *bond = netdev_priv(dev);
5144         struct bond_up_slave *slaves;
5145         struct slave *slave;
5146
5147         slaves = rcu_dereference(bond->usable_slaves);
5148         slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
5149         if (likely(slave))
5150                 return bond_dev_queue_xmit(bond, skb, slave->dev);
5151
5152         return bond_tx_drop(dev, skb);
5153 }
5154
5155 /* in broadcast mode, we send everything to all usable interfaces. */
5156 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
5157                                        struct net_device *bond_dev)
5158 {
5159         struct bonding *bond = netdev_priv(bond_dev);
5160         struct slave *slave = NULL;
5161         struct list_head *iter;
5162         bool xmit_suc = false;
5163         bool skb_used = false;
5164
5165         bond_for_each_slave_rcu(bond, slave, iter) {
5166                 struct sk_buff *skb2;
5167
5168                 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP))
5169                         continue;
5170
5171                 if (bond_is_last_slave(bond, slave)) {
5172                         skb2 = skb;
5173                         skb_used = true;
5174                 } else {
5175                         skb2 = skb_clone(skb, GFP_ATOMIC);
5176                         if (!skb2) {
5177                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
5178                                                     bond_dev->name, __func__);
5179                                 continue;
5180                         }
5181                 }
5182
5183                 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK)
5184                         xmit_suc = true;
5185         }
5186
5187         if (!skb_used)
5188                 dev_kfree_skb_any(skb);
5189
5190         if (xmit_suc)
5191                 return NETDEV_TX_OK;
5192
5193         dev_core_stats_tx_dropped_inc(bond_dev);
5194         return NET_XMIT_DROP;
5195 }
5196
5197 /*------------------------- Device initialization ---------------------------*/
5198
5199 /* Lookup the slave that corresponds to a qid */
5200 static inline int bond_slave_override(struct bonding *bond,
5201                                       struct sk_buff *skb)
5202 {
5203         struct slave *slave = NULL;
5204         struct list_head *iter;
5205
5206         if (!skb_rx_queue_recorded(skb))
5207                 return 1;
5208
5209         /* Find out if any slaves have the same mapping as this skb. */
5210         bond_for_each_slave_rcu(bond, slave, iter) {
5211                 if (slave->queue_id == skb_get_queue_mapping(skb)) {
5212                         if (bond_slave_is_up(slave) &&
5213                             slave->link == BOND_LINK_UP) {
5214                                 bond_dev_queue_xmit(bond, skb, slave->dev);
5215                                 return 0;
5216                         }
5217                         /* If the slave isn't UP, use default transmit policy. */
5218                         break;
5219                 }
5220         }
5221
5222         return 1;
5223 }
5224
5225
5226 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
5227                              struct net_device *sb_dev)
5228 {
5229         /* This helper function exists to help dev_pick_tx get the correct
5230          * destination queue.  Using a helper function skips a call to
5231          * skb_tx_hash and will put the skbs in the queue we expect on their
5232          * way down to the bonding driver.
5233          */
5234         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
5235
5236         /* Save the original txq to restore before passing to the driver */
5237         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
5238
5239         if (unlikely(txq >= dev->real_num_tx_queues)) {
5240                 do {
5241                         txq -= dev->real_num_tx_queues;
5242                 } while (txq >= dev->real_num_tx_queues);
5243         }
5244         return txq;
5245 }
5246
5247 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
5248                                               struct sk_buff *skb,
5249                                               bool all_slaves)
5250 {
5251         struct bonding *bond = netdev_priv(master_dev);
5252         struct bond_up_slave *slaves;
5253         struct slave *slave = NULL;
5254
5255         switch (BOND_MODE(bond)) {
5256         case BOND_MODE_ROUNDROBIN:
5257                 slave = bond_xmit_roundrobin_slave_get(bond, skb);
5258                 break;
5259         case BOND_MODE_ACTIVEBACKUP:
5260                 slave = bond_xmit_activebackup_slave_get(bond);
5261                 break;
5262         case BOND_MODE_8023AD:
5263         case BOND_MODE_XOR:
5264                 if (all_slaves)
5265                         slaves = rcu_dereference(bond->all_slaves);
5266                 else
5267                         slaves = rcu_dereference(bond->usable_slaves);
5268                 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
5269                 break;
5270         case BOND_MODE_BROADCAST:
5271                 break;
5272         case BOND_MODE_ALB:
5273                 slave = bond_xmit_alb_slave_get(bond, skb);
5274                 break;
5275         case BOND_MODE_TLB:
5276                 slave = bond_xmit_tlb_slave_get(bond, skb);
5277                 break;
5278         default:
5279                 /* Should never happen, mode already checked */
5280                 WARN_ONCE(true, "Unknown bonding mode");
5281                 break;
5282         }
5283
5284         if (slave)
5285                 return slave->dev;
5286         return NULL;
5287 }
5288
5289 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow)
5290 {
5291         switch (sk->sk_family) {
5292 #if IS_ENABLED(CONFIG_IPV6)
5293         case AF_INET6:
5294                 if (ipv6_only_sock(sk) ||
5295                     ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) {
5296                         flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
5297                         flow->addrs.v6addrs.src = inet6_sk(sk)->saddr;
5298                         flow->addrs.v6addrs.dst = sk->sk_v6_daddr;
5299                         break;
5300                 }
5301                 fallthrough;
5302 #endif
5303         default: /* AF_INET */
5304                 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
5305                 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr;
5306                 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr;
5307                 break;
5308         }
5309
5310         flow->ports.src = inet_sk(sk)->inet_sport;
5311         flow->ports.dst = inet_sk(sk)->inet_dport;
5312 }
5313
5314 /**
5315  * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields
5316  * @sk: socket to use for headers
5317  *
5318  * This function will extract the necessary field from the socket and use
5319  * them to generate a hash based on the LAYER34 xmit_policy.
5320  * Assumes that sk is a TCP or UDP socket.
5321  */
5322 static u32 bond_sk_hash_l34(struct sock *sk)
5323 {
5324         struct flow_keys flow;
5325         u32 hash;
5326
5327         bond_sk_to_flow(sk, &flow);
5328
5329         /* L4 */
5330         memcpy(&hash, &flow.ports.ports, sizeof(hash));
5331         /* L3 */
5332         return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34);
5333 }
5334
5335 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond,
5336                                                   struct sock *sk)
5337 {
5338         struct bond_up_slave *slaves;
5339         struct slave *slave;
5340         unsigned int count;
5341         u32 hash;
5342
5343         slaves = rcu_dereference(bond->usable_slaves);
5344         count = slaves ? READ_ONCE(slaves->count) : 0;
5345         if (unlikely(!count))
5346                 return NULL;
5347
5348         hash = bond_sk_hash_l34(sk);
5349         slave = slaves->arr[hash % count];
5350
5351         return slave->dev;
5352 }
5353
5354 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev,
5355                                                 struct sock *sk)
5356 {
5357         struct bonding *bond = netdev_priv(dev);
5358         struct net_device *lower = NULL;
5359
5360         rcu_read_lock();
5361         if (bond_sk_check(bond))
5362                 lower = __bond_sk_get_lower_dev(bond, sk);
5363         rcu_read_unlock();
5364
5365         return lower;
5366 }
5367
5368 #if IS_ENABLED(CONFIG_TLS_DEVICE)
5369 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb,
5370                                         struct net_device *dev)
5371 {
5372         struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev);
5373
5374         /* tls_netdev might become NULL, even if tls_is_sk_tx_device_offloaded
5375          * was true, if tls_device_down is running in parallel, but it's OK,
5376          * because bond_get_slave_by_dev has a NULL check.
5377          */
5378         if (likely(bond_get_slave_by_dev(bond, tls_netdev)))
5379                 return bond_dev_queue_xmit(bond, skb, tls_netdev);
5380         return bond_tx_drop(dev, skb);
5381 }
5382 #endif
5383
5384 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
5385 {
5386         struct bonding *bond = netdev_priv(dev);
5387
5388         if (bond_should_override_tx_queue(bond) &&
5389             !bond_slave_override(bond, skb))
5390                 return NETDEV_TX_OK;
5391
5392 #if IS_ENABLED(CONFIG_TLS_DEVICE)
5393         if (skb->sk && tls_is_sk_tx_device_offloaded(skb->sk))
5394                 return bond_tls_device_xmit(bond, skb, dev);
5395 #endif
5396
5397         switch (BOND_MODE(bond)) {
5398         case BOND_MODE_ROUNDROBIN:
5399                 return bond_xmit_roundrobin(skb, dev);
5400         case BOND_MODE_ACTIVEBACKUP:
5401                 return bond_xmit_activebackup(skb, dev);
5402         case BOND_MODE_8023AD:
5403         case BOND_MODE_XOR:
5404                 return bond_3ad_xor_xmit(skb, dev);
5405         case BOND_MODE_BROADCAST:
5406                 return bond_xmit_broadcast(skb, dev);
5407         case BOND_MODE_ALB:
5408                 return bond_alb_xmit(skb, dev);
5409         case BOND_MODE_TLB:
5410                 return bond_tlb_xmit(skb, dev);
5411         default:
5412                 /* Should never happen, mode already checked */
5413                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
5414                 WARN_ON_ONCE(1);
5415                 return bond_tx_drop(dev, skb);
5416         }
5417 }
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         netdev_tx_t ret = NETDEV_TX_OK;
5423
5424         /* If we risk deadlock from transmitting this in the
5425          * netpoll path, tell netpoll to queue the frame for later tx
5426          */
5427         if (unlikely(is_netpoll_tx_blocked(dev)))
5428                 return NETDEV_TX_BUSY;
5429
5430         rcu_read_lock();
5431         if (bond_has_slaves(bond))
5432                 ret = __bond_start_xmit(skb, dev);
5433         else
5434                 ret = bond_tx_drop(dev, skb);
5435         rcu_read_unlock();
5436
5437         return ret;
5438 }
5439
5440 static struct net_device *
5441 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp)
5442 {
5443         struct bonding *bond = netdev_priv(bond_dev);
5444         struct slave *slave;
5445
5446         /* Caller needs to hold rcu_read_lock() */
5447
5448         switch (BOND_MODE(bond)) {
5449         case BOND_MODE_ROUNDROBIN:
5450                 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp);
5451                 break;
5452
5453         case BOND_MODE_ACTIVEBACKUP:
5454                 slave = bond_xmit_activebackup_slave_get(bond);
5455                 break;
5456
5457         case BOND_MODE_8023AD:
5458         case BOND_MODE_XOR:
5459                 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp);
5460                 break;
5461
5462         default:
5463                 /* Should never happen. Mode guarded by bond_xdp_check() */
5464                 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond));
5465                 WARN_ON_ONCE(1);
5466                 return NULL;
5467         }
5468
5469         if (slave)
5470                 return slave->dev;
5471
5472         return NULL;
5473 }
5474
5475 static int bond_xdp_xmit(struct net_device *bond_dev,
5476                          int n, struct xdp_frame **frames, u32 flags)
5477 {
5478         int nxmit, err = -ENXIO;
5479
5480         rcu_read_lock();
5481
5482         for (nxmit = 0; nxmit < n; nxmit++) {
5483                 struct xdp_frame *frame = frames[nxmit];
5484                 struct xdp_frame *frames1[] = {frame};
5485                 struct net_device *slave_dev;
5486                 struct xdp_buff xdp;
5487
5488                 xdp_convert_frame_to_buff(frame, &xdp);
5489
5490                 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp);
5491                 if (!slave_dev) {
5492                         err = -ENXIO;
5493                         break;
5494                 }
5495
5496                 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags);
5497                 if (err < 1)
5498                         break;
5499         }
5500
5501         rcu_read_unlock();
5502
5503         /* If error happened on the first frame then we can pass the error up, otherwise
5504          * report the number of frames that were xmitted.
5505          */
5506         if (err < 0)
5507                 return (nxmit == 0 ? err : nxmit);
5508
5509         return nxmit;
5510 }
5511
5512 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog,
5513                         struct netlink_ext_ack *extack)
5514 {
5515         struct bonding *bond = netdev_priv(dev);
5516         struct list_head *iter;
5517         struct slave *slave, *rollback_slave;
5518         struct bpf_prog *old_prog;
5519         struct netdev_bpf xdp = {
5520                 .command = XDP_SETUP_PROG,
5521                 .flags   = 0,
5522                 .prog    = prog,
5523                 .extack  = extack,
5524         };
5525         int err;
5526
5527         ASSERT_RTNL();
5528
5529         if (!bond_xdp_check(bond))
5530                 return -EOPNOTSUPP;
5531
5532         old_prog = bond->xdp_prog;
5533         bond->xdp_prog = prog;
5534
5535         bond_for_each_slave(bond, slave, iter) {
5536                 struct net_device *slave_dev = slave->dev;
5537
5538                 if (!slave_dev->netdev_ops->ndo_bpf ||
5539                     !slave_dev->netdev_ops->ndo_xdp_xmit) {
5540                         SLAVE_NL_ERR(dev, slave_dev, extack,
5541                                      "Slave device does not support XDP");
5542                         err = -EOPNOTSUPP;
5543                         goto err;
5544                 }
5545
5546                 if (dev_xdp_prog_count(slave_dev) > 0) {
5547                         SLAVE_NL_ERR(dev, slave_dev, extack,
5548                                      "Slave has XDP program loaded, please unload before enslaving");
5549                         err = -EOPNOTSUPP;
5550                         goto err;
5551                 }
5552
5553                 err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
5554                 if (err < 0) {
5555                         /* ndo_bpf() sets extack error message */
5556                         slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err);
5557                         goto err;
5558                 }
5559                 if (prog)
5560                         bpf_prog_inc(prog);
5561         }
5562
5563         if (prog) {
5564                 static_branch_inc(&bpf_master_redirect_enabled_key);
5565         } else if (old_prog) {
5566                 bpf_prog_put(old_prog);
5567                 static_branch_dec(&bpf_master_redirect_enabled_key);
5568         }
5569
5570         return 0;
5571
5572 err:
5573         /* unwind the program changes */
5574         bond->xdp_prog = old_prog;
5575         xdp.prog = old_prog;
5576         xdp.extack = NULL; /* do not overwrite original error */
5577
5578         bond_for_each_slave(bond, rollback_slave, iter) {
5579                 struct net_device *slave_dev = rollback_slave->dev;
5580                 int err_unwind;
5581
5582                 if (slave == rollback_slave)
5583                         break;
5584
5585                 err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
5586                 if (err_unwind < 0)
5587                         slave_err(dev, slave_dev,
5588                                   "Error %d when unwinding XDP program change\n", err_unwind);
5589                 else if (xdp.prog)
5590                         bpf_prog_inc(xdp.prog);
5591         }
5592         return err;
5593 }
5594
5595 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp)
5596 {
5597         switch (xdp->command) {
5598         case XDP_SETUP_PROG:
5599                 return bond_xdp_set(dev, xdp->prog, xdp->extack);
5600         default:
5601                 return -EINVAL;
5602         }
5603 }
5604
5605 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
5606 {
5607         if (speed == 0 || speed == SPEED_UNKNOWN)
5608                 speed = slave->speed;
5609         else
5610                 speed = min(speed, slave->speed);
5611
5612         return speed;
5613 }
5614
5615 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
5616                                            struct ethtool_link_ksettings *cmd)
5617 {
5618         struct bonding *bond = netdev_priv(bond_dev);
5619         struct list_head *iter;
5620         struct slave *slave;
5621         u32 speed = 0;
5622
5623         cmd->base.duplex = DUPLEX_UNKNOWN;
5624         cmd->base.port = PORT_OTHER;
5625
5626         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
5627          * do not need to check mode.  Though link speed might not represent
5628          * the true receive or transmit bandwidth (not all modes are symmetric)
5629          * this is an accurate maximum.
5630          */
5631         bond_for_each_slave(bond, slave, iter) {
5632                 if (bond_slave_can_tx(slave)) {
5633                         if (slave->speed != SPEED_UNKNOWN) {
5634                                 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
5635                                         speed = bond_mode_bcast_speed(slave,
5636                                                                       speed);
5637                                 else
5638                                         speed += slave->speed;
5639                         }
5640                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
5641                             slave->duplex != DUPLEX_UNKNOWN)
5642                                 cmd->base.duplex = slave->duplex;
5643                 }
5644         }
5645         cmd->base.speed = speed ? : SPEED_UNKNOWN;
5646
5647         return 0;
5648 }
5649
5650 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
5651                                      struct ethtool_drvinfo *drvinfo)
5652 {
5653         strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
5654         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
5655                  BOND_ABI_VERSION);
5656 }
5657
5658 static int bond_ethtool_get_ts_info(struct net_device *bond_dev,
5659                                     struct ethtool_ts_info *info)
5660 {
5661         struct bonding *bond = netdev_priv(bond_dev);
5662         const struct ethtool_ops *ops;
5663         struct net_device *real_dev;
5664         struct phy_device *phydev;
5665         int ret = 0;
5666
5667         rcu_read_lock();
5668         real_dev = bond_option_active_slave_get_rcu(bond);
5669         dev_hold(real_dev);
5670         rcu_read_unlock();
5671
5672         if (real_dev) {
5673                 ops = real_dev->ethtool_ops;
5674                 phydev = real_dev->phydev;
5675
5676                 if (phy_has_tsinfo(phydev)) {
5677                         ret = phy_ts_info(phydev, info);
5678                         goto out;
5679                 } else if (ops->get_ts_info) {
5680                         ret = ops->get_ts_info(real_dev, info);
5681                         goto out;
5682                 }
5683         }
5684
5685         info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
5686                                 SOF_TIMESTAMPING_SOFTWARE;
5687         info->phc_index = -1;
5688
5689 out:
5690         dev_put(real_dev);
5691         return ret;
5692 }
5693
5694 static const struct ethtool_ops bond_ethtool_ops = {
5695         .get_drvinfo            = bond_ethtool_get_drvinfo,
5696         .get_link               = ethtool_op_get_link,
5697         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
5698         .get_ts_info            = bond_ethtool_get_ts_info,
5699 };
5700
5701 static const struct net_device_ops bond_netdev_ops = {
5702         .ndo_init               = bond_init,
5703         .ndo_uninit             = bond_uninit,
5704         .ndo_open               = bond_open,
5705         .ndo_stop               = bond_close,
5706         .ndo_start_xmit         = bond_start_xmit,
5707         .ndo_select_queue       = bond_select_queue,
5708         .ndo_get_stats64        = bond_get_stats,
5709         .ndo_eth_ioctl          = bond_eth_ioctl,
5710         .ndo_siocbond           = bond_do_ioctl,
5711         .ndo_siocdevprivate     = bond_siocdevprivate,
5712         .ndo_change_rx_flags    = bond_change_rx_flags,
5713         .ndo_set_rx_mode        = bond_set_rx_mode,
5714         .ndo_change_mtu         = bond_change_mtu,
5715         .ndo_set_mac_address    = bond_set_mac_address,
5716         .ndo_neigh_setup        = bond_neigh_setup,
5717         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
5718         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
5719 #ifdef CONFIG_NET_POLL_CONTROLLER
5720         .ndo_netpoll_setup      = bond_netpoll_setup,
5721         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
5722         .ndo_poll_controller    = bond_poll_controller,
5723 #endif
5724         .ndo_add_slave          = bond_enslave,
5725         .ndo_del_slave          = bond_release,
5726         .ndo_fix_features       = bond_fix_features,
5727         .ndo_features_check     = passthru_features_check,
5728         .ndo_get_xmit_slave     = bond_xmit_get_slave,
5729         .ndo_sk_get_lower_dev   = bond_sk_get_lower_dev,
5730         .ndo_bpf                = bond_xdp,
5731         .ndo_xdp_xmit           = bond_xdp_xmit,
5732         .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave,
5733 };
5734
5735 static const struct device_type bond_type = {
5736         .name = "bond",
5737 };
5738
5739 static void bond_destructor(struct net_device *bond_dev)
5740 {
5741         struct bonding *bond = netdev_priv(bond_dev);
5742
5743         if (bond->wq)
5744                 destroy_workqueue(bond->wq);
5745
5746         if (bond->rr_tx_counter)
5747                 free_percpu(bond->rr_tx_counter);
5748 }
5749
5750 void bond_setup(struct net_device *bond_dev)
5751 {
5752         struct bonding *bond = netdev_priv(bond_dev);
5753
5754         spin_lock_init(&bond->mode_lock);
5755         bond->params = bonding_defaults;
5756
5757         /* Initialize pointers */
5758         bond->dev = bond_dev;
5759
5760         /* Initialize the device entry points */
5761         ether_setup(bond_dev);
5762         bond_dev->max_mtu = ETH_MAX_MTU;
5763         bond_dev->netdev_ops = &bond_netdev_ops;
5764         bond_dev->ethtool_ops = &bond_ethtool_ops;
5765
5766         bond_dev->needs_free_netdev = true;
5767         bond_dev->priv_destructor = bond_destructor;
5768
5769         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
5770
5771         /* Initialize the device options */
5772         bond_dev->flags |= IFF_MASTER;
5773         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
5774         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
5775
5776 #ifdef CONFIG_XFRM_OFFLOAD
5777         /* set up xfrm device ops (only supported in active-backup right now) */
5778         bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
5779         INIT_LIST_HEAD(&bond->ipsec_list);
5780         spin_lock_init(&bond->ipsec_lock);
5781 #endif /* CONFIG_XFRM_OFFLOAD */
5782
5783         /* don't acquire bond device's netif_tx_lock when transmitting */
5784         bond_dev->features |= NETIF_F_LLTX;
5785
5786         /* By default, we declare the bond to be fully
5787          * VLAN hardware accelerated capable. Special
5788          * care is taken in the various xmit functions
5789          * when there are slaves that are not hw accel
5790          * capable
5791          */
5792
5793         /* Don't allow bond devices to change network namespaces. */
5794         bond_dev->features |= NETIF_F_NETNS_LOCAL;
5795
5796         bond_dev->hw_features = BOND_VLAN_FEATURES |
5797                                 NETIF_F_HW_VLAN_CTAG_RX |
5798                                 NETIF_F_HW_VLAN_CTAG_FILTER;
5799
5800         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
5801         bond_dev->features |= bond_dev->hw_features;
5802         bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
5803 #ifdef CONFIG_XFRM_OFFLOAD
5804         bond_dev->hw_features |= BOND_XFRM_FEATURES;
5805         /* Only enable XFRM features if this is an active-backup config */
5806         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
5807                 bond_dev->features |= BOND_XFRM_FEATURES;
5808 #endif /* CONFIG_XFRM_OFFLOAD */
5809 #if IS_ENABLED(CONFIG_TLS_DEVICE)
5810         if (bond_sk_check(bond))
5811                 bond_dev->features |= BOND_TLS_FEATURES;
5812 #endif
5813 }
5814
5815 /* Destroy a bonding device.
5816  * Must be under rtnl_lock when this function is called.
5817  */
5818 static void bond_uninit(struct net_device *bond_dev)
5819 {
5820         struct bonding *bond = netdev_priv(bond_dev);
5821         struct bond_up_slave *usable, *all;
5822         struct list_head *iter;
5823         struct slave *slave;
5824
5825         bond_netpoll_cleanup(bond_dev);
5826
5827         /* Release the bonded slaves */
5828         bond_for_each_slave(bond, slave, iter)
5829                 __bond_release_one(bond_dev, slave->dev, true, true);
5830         netdev_info(bond_dev, "Released all slaves\n");
5831
5832         usable = rtnl_dereference(bond->usable_slaves);
5833         if (usable) {
5834                 RCU_INIT_POINTER(bond->usable_slaves, NULL);
5835                 kfree_rcu(usable, rcu);
5836         }
5837
5838         all = rtnl_dereference(bond->all_slaves);
5839         if (all) {
5840                 RCU_INIT_POINTER(bond->all_slaves, NULL);
5841                 kfree_rcu(all, rcu);
5842         }
5843
5844         list_del(&bond->bond_list);
5845
5846         bond_debug_unregister(bond);
5847 }
5848
5849 /*------------------------- Module initialization ---------------------------*/
5850
5851 static int bond_check_params(struct bond_params *params)
5852 {
5853         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
5854         struct bond_opt_value newval;
5855         const struct bond_opt_value *valptr;
5856         int arp_all_targets_value = 0;
5857         u16 ad_actor_sys_prio = 0;
5858         u16 ad_user_port_key = 0;
5859         __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
5860         int arp_ip_count;
5861         int bond_mode   = BOND_MODE_ROUNDROBIN;
5862         int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
5863         int lacp_fast = 0;
5864         int tlb_dynamic_lb;
5865
5866         /* Convert string parameters. */
5867         if (mode) {
5868                 bond_opt_initstr(&newval, mode);
5869                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
5870                 if (!valptr) {
5871                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
5872                         return -EINVAL;
5873                 }
5874                 bond_mode = valptr->value;
5875         }
5876
5877         if (xmit_hash_policy) {
5878                 if (bond_mode == BOND_MODE_ROUNDROBIN ||
5879                     bond_mode == BOND_MODE_ACTIVEBACKUP ||
5880                     bond_mode == BOND_MODE_BROADCAST) {
5881                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
5882                                 bond_mode_name(bond_mode));
5883                 } else {
5884                         bond_opt_initstr(&newval, xmit_hash_policy);
5885                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
5886                                                 &newval);
5887                         if (!valptr) {
5888                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
5889                                        xmit_hash_policy);
5890                                 return -EINVAL;
5891                         }
5892                         xmit_hashtype = valptr->value;
5893                 }
5894         }
5895
5896         if (lacp_rate) {
5897                 if (bond_mode != BOND_MODE_8023AD) {
5898                         pr_info("lacp_rate param is irrelevant in mode %s\n",
5899                                 bond_mode_name(bond_mode));
5900                 } else {
5901                         bond_opt_initstr(&newval, lacp_rate);
5902                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
5903                                                 &newval);
5904                         if (!valptr) {
5905                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
5906                                        lacp_rate);
5907                                 return -EINVAL;
5908                         }
5909                         lacp_fast = valptr->value;
5910                 }
5911         }
5912
5913         if (ad_select) {
5914                 bond_opt_initstr(&newval, ad_select);
5915                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
5916                                         &newval);
5917                 if (!valptr) {
5918                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
5919                         return -EINVAL;
5920                 }
5921                 params->ad_select = valptr->value;
5922                 if (bond_mode != BOND_MODE_8023AD)
5923                         pr_warn("ad_select param only affects 802.3ad mode\n");
5924         } else {
5925                 params->ad_select = BOND_AD_STABLE;
5926         }
5927
5928         if (max_bonds < 0) {
5929                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
5930                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
5931                 max_bonds = BOND_DEFAULT_MAX_BONDS;
5932         }
5933
5934         if (miimon < 0) {
5935                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5936                         miimon, INT_MAX);
5937                 miimon = 0;
5938         }
5939
5940         if (updelay < 0) {
5941                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5942                         updelay, INT_MAX);
5943                 updelay = 0;
5944         }
5945
5946         if (downdelay < 0) {
5947                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5948                         downdelay, INT_MAX);
5949                 downdelay = 0;
5950         }
5951
5952         if ((use_carrier != 0) && (use_carrier != 1)) {
5953                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
5954                         use_carrier);
5955                 use_carrier = 1;
5956         }
5957
5958         if (num_peer_notif < 0 || num_peer_notif > 255) {
5959                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
5960                         num_peer_notif);
5961                 num_peer_notif = 1;
5962         }
5963
5964         /* reset values for 802.3ad/TLB/ALB */
5965         if (!bond_mode_uses_arp(bond_mode)) {
5966                 if (!miimon) {
5967                         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");
5968                         pr_warn("Forcing miimon to 100msec\n");
5969                         miimon = BOND_DEFAULT_MIIMON;
5970                 }
5971         }
5972
5973         if (tx_queues < 1 || tx_queues > 255) {
5974                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
5975                         tx_queues, BOND_DEFAULT_TX_QUEUES);
5976                 tx_queues = BOND_DEFAULT_TX_QUEUES;
5977         }
5978
5979         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
5980                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
5981                         all_slaves_active);
5982                 all_slaves_active = 0;
5983         }
5984
5985         if (resend_igmp < 0 || resend_igmp > 255) {
5986                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
5987                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
5988                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
5989         }
5990
5991         bond_opt_initval(&newval, packets_per_slave);
5992         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
5993                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
5994                         packets_per_slave, USHRT_MAX);
5995                 packets_per_slave = 1;
5996         }
5997
5998         if (bond_mode == BOND_MODE_ALB) {
5999                 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",
6000                           updelay);
6001         }
6002
6003         if (!miimon) {
6004                 if (updelay || downdelay) {
6005                         /* just warn the user the up/down delay will have
6006                          * no effect since miimon is zero...
6007                          */
6008                         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",
6009                                 updelay, downdelay);
6010                 }
6011         } else {
6012                 /* don't allow arp monitoring */
6013                 if (arp_interval) {
6014                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
6015                                 miimon, arp_interval);
6016                         arp_interval = 0;
6017                 }
6018
6019                 if ((updelay % miimon) != 0) {
6020                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
6021                                 updelay, miimon, (updelay / miimon) * miimon);
6022                 }
6023
6024                 updelay /= miimon;
6025
6026                 if ((downdelay % miimon) != 0) {
6027                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
6028                                 downdelay, miimon,
6029                                 (downdelay / miimon) * miimon);
6030                 }
6031
6032                 downdelay /= miimon;
6033         }
6034
6035         if (arp_interval < 0) {
6036                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6037                         arp_interval, INT_MAX);
6038                 arp_interval = 0;
6039         }
6040
6041         for (arp_ip_count = 0, i = 0;
6042              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
6043                 __be32 ip;
6044
6045                 /* not a complete check, but good enough to catch mistakes */
6046                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
6047                     !bond_is_ip_target_ok(ip)) {
6048                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
6049                                 arp_ip_target[i]);
6050                         arp_interval = 0;
6051                 } else {
6052                         if (bond_get_targets_ip(arp_target, ip) == -1)
6053                                 arp_target[arp_ip_count++] = ip;
6054                         else
6055                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
6056                                         &ip);
6057                 }
6058         }
6059
6060         if (arp_interval && !arp_ip_count) {
6061                 /* don't allow arping if no arp_ip_target given... */
6062                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
6063                         arp_interval);
6064                 arp_interval = 0;
6065         }
6066
6067         if (arp_validate) {
6068                 if (!arp_interval) {
6069                         pr_err("arp_validate requires arp_interval\n");
6070                         return -EINVAL;
6071                 }
6072
6073                 bond_opt_initstr(&newval, arp_validate);
6074                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
6075                                         &newval);
6076                 if (!valptr) {
6077                         pr_err("Error: invalid arp_validate \"%s\"\n",
6078                                arp_validate);
6079                         return -EINVAL;
6080                 }
6081                 arp_validate_value = valptr->value;
6082         } else {
6083                 arp_validate_value = 0;
6084         }
6085
6086         if (arp_all_targets) {
6087                 bond_opt_initstr(&newval, arp_all_targets);
6088                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
6089                                         &newval);
6090                 if (!valptr) {
6091                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
6092                                arp_all_targets);
6093                         arp_all_targets_value = 0;
6094                 } else {
6095                         arp_all_targets_value = valptr->value;
6096                 }
6097         }
6098
6099         if (miimon) {
6100                 pr_info("MII link monitoring set to %d ms\n", miimon);
6101         } else if (arp_interval) {
6102                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
6103                                           arp_validate_value);
6104                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
6105                         arp_interval, valptr->string, arp_ip_count);
6106
6107                 for (i = 0; i < arp_ip_count; i++)
6108                         pr_cont(" %s", arp_ip_target[i]);
6109
6110                 pr_cont("\n");
6111
6112         } else if (max_bonds) {
6113                 /* miimon and arp_interval not set, we need one so things
6114                  * work as expected, see bonding.txt for details
6115                  */
6116                 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");
6117         }
6118
6119         if (primary && !bond_mode_uses_primary(bond_mode)) {
6120                 /* currently, using a primary only makes sense
6121                  * in active backup, TLB or ALB modes
6122                  */
6123                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
6124                         primary, bond_mode_name(bond_mode));
6125                 primary = NULL;
6126         }
6127
6128         if (primary && primary_reselect) {
6129                 bond_opt_initstr(&newval, primary_reselect);
6130                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
6131                                         &newval);
6132                 if (!valptr) {
6133                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
6134                                primary_reselect);
6135                         return -EINVAL;
6136                 }
6137                 primary_reselect_value = valptr->value;
6138         } else {
6139                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
6140         }
6141
6142         if (fail_over_mac) {
6143                 bond_opt_initstr(&newval, fail_over_mac);
6144                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
6145                                         &newval);
6146                 if (!valptr) {
6147                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
6148                                fail_over_mac);
6149                         return -EINVAL;
6150                 }
6151                 fail_over_mac_value = valptr->value;
6152                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
6153                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
6154         } else {
6155                 fail_over_mac_value = BOND_FOM_NONE;
6156         }
6157
6158         bond_opt_initstr(&newval, "default");
6159         valptr = bond_opt_parse(
6160                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
6161                                      &newval);
6162         if (!valptr) {
6163                 pr_err("Error: No ad_actor_sys_prio default value");
6164                 return -EINVAL;
6165         }
6166         ad_actor_sys_prio = valptr->value;
6167
6168         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
6169                                 &newval);
6170         if (!valptr) {
6171                 pr_err("Error: No ad_user_port_key default value");
6172                 return -EINVAL;
6173         }
6174         ad_user_port_key = valptr->value;
6175
6176         bond_opt_initstr(&newval, "default");
6177         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
6178         if (!valptr) {
6179                 pr_err("Error: No tlb_dynamic_lb default value");
6180                 return -EINVAL;
6181         }
6182         tlb_dynamic_lb = valptr->value;
6183
6184         if (lp_interval == 0) {
6185                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
6186                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
6187                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
6188         }
6189
6190         /* fill params struct with the proper values */
6191         params->mode = bond_mode;
6192         params->xmit_policy = xmit_hashtype;
6193         params->miimon = miimon;
6194         params->num_peer_notif = num_peer_notif;
6195         params->arp_interval = arp_interval;
6196         params->arp_validate = arp_validate_value;
6197         params->arp_all_targets = arp_all_targets_value;
6198         params->missed_max = 2;
6199         params->updelay = updelay;
6200         params->downdelay = downdelay;
6201         params->peer_notif_delay = 0;
6202         params->use_carrier = use_carrier;
6203         params->lacp_active = 1;
6204         params->lacp_fast = lacp_fast;
6205         params->primary[0] = 0;
6206         params->primary_reselect = primary_reselect_value;
6207         params->fail_over_mac = fail_over_mac_value;
6208         params->tx_queues = tx_queues;
6209         params->all_slaves_active = all_slaves_active;
6210         params->resend_igmp = resend_igmp;
6211         params->min_links = min_links;
6212         params->lp_interval = lp_interval;
6213         params->packets_per_slave = packets_per_slave;
6214         params->tlb_dynamic_lb = tlb_dynamic_lb;
6215         params->ad_actor_sys_prio = ad_actor_sys_prio;
6216         eth_zero_addr(params->ad_actor_system);
6217         params->ad_user_port_key = ad_user_port_key;
6218         if (packets_per_slave > 0) {
6219                 params->reciprocal_packets_per_slave =
6220                         reciprocal_value(packets_per_slave);
6221         } else {
6222                 /* reciprocal_packets_per_slave is unused if
6223                  * packets_per_slave is 0 or 1, just initialize it
6224                  */
6225                 params->reciprocal_packets_per_slave =
6226                         (struct reciprocal_value) { 0 };
6227         }
6228
6229         if (primary)
6230                 strscpy_pad(params->primary, primary, sizeof(params->primary));
6231
6232         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
6233 #if IS_ENABLED(CONFIG_IPV6)
6234         memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS);
6235 #endif
6236
6237         return 0;
6238 }
6239
6240 /* Called from registration process */
6241 static int bond_init(struct net_device *bond_dev)
6242 {
6243         struct bonding *bond = netdev_priv(bond_dev);
6244         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
6245
6246         netdev_dbg(bond_dev, "Begin bond_init\n");
6247
6248         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
6249         if (!bond->wq)
6250                 return -ENOMEM;
6251
6252         spin_lock_init(&bond->stats_lock);
6253         netdev_lockdep_set_classes(bond_dev);
6254
6255         list_add_tail(&bond->bond_list, &bn->dev_list);
6256
6257         bond_prepare_sysfs_group(bond);
6258
6259         bond_debug_register(bond);
6260
6261         /* Ensure valid dev_addr */
6262         if (is_zero_ether_addr(bond_dev->dev_addr) &&
6263             bond_dev->addr_assign_type == NET_ADDR_PERM)
6264                 eth_hw_addr_random(bond_dev);
6265
6266         return 0;
6267 }
6268
6269 unsigned int bond_get_num_tx_queues(void)
6270 {
6271         return tx_queues;
6272 }
6273
6274 /* Create a new bond based on the specified name and bonding parameters.
6275  * If name is NULL, obtain a suitable "bond%d" name for us.
6276  * Caller must NOT hold rtnl_lock; we need to release it here before we
6277  * set up our sysfs entries.
6278  */
6279 int bond_create(struct net *net, const char *name)
6280 {
6281         struct net_device *bond_dev;
6282         struct bonding *bond;
6283         int res = -ENOMEM;
6284
6285         rtnl_lock();
6286
6287         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
6288                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
6289                                    bond_setup, tx_queues);
6290         if (!bond_dev)
6291                 goto out;
6292
6293         bond = netdev_priv(bond_dev);
6294         dev_net_set(bond_dev, net);
6295         bond_dev->rtnl_link_ops = &bond_link_ops;
6296
6297         res = register_netdevice(bond_dev);
6298         if (res < 0) {
6299                 free_netdev(bond_dev);
6300                 goto out;
6301         }
6302
6303         netif_carrier_off(bond_dev);
6304
6305         bond_work_init_all(bond);
6306
6307 out:
6308         rtnl_unlock();
6309         return res;
6310 }
6311
6312 static int __net_init bond_net_init(struct net *net)
6313 {
6314         struct bond_net *bn = net_generic(net, bond_net_id);
6315
6316         bn->net = net;
6317         INIT_LIST_HEAD(&bn->dev_list);
6318
6319         bond_create_proc_dir(bn);
6320         bond_create_sysfs(bn);
6321
6322         return 0;
6323 }
6324
6325 static void __net_exit bond_net_exit_batch(struct list_head *net_list)
6326 {
6327         struct bond_net *bn;
6328         struct net *net;
6329         LIST_HEAD(list);
6330
6331         list_for_each_entry(net, net_list, exit_list) {
6332                 bn = net_generic(net, bond_net_id);
6333                 bond_destroy_sysfs(bn);
6334         }
6335
6336         /* Kill off any bonds created after unregistering bond rtnl ops */
6337         rtnl_lock();
6338         list_for_each_entry(net, net_list, exit_list) {
6339                 struct bonding *bond, *tmp_bond;
6340
6341                 bn = net_generic(net, bond_net_id);
6342                 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
6343                         unregister_netdevice_queue(bond->dev, &list);
6344         }
6345         unregister_netdevice_many(&list);
6346         rtnl_unlock();
6347
6348         list_for_each_entry(net, net_list, exit_list) {
6349                 bn = net_generic(net, bond_net_id);
6350                 bond_destroy_proc_dir(bn);
6351         }
6352 }
6353
6354 static struct pernet_operations bond_net_ops = {
6355         .init = bond_net_init,
6356         .exit_batch = bond_net_exit_batch,
6357         .id   = &bond_net_id,
6358         .size = sizeof(struct bond_net),
6359 };
6360
6361 static int __init bonding_init(void)
6362 {
6363         int i;
6364         int res;
6365
6366         res = bond_check_params(&bonding_defaults);
6367         if (res)
6368                 goto out;
6369
6370         res = register_pernet_subsys(&bond_net_ops);
6371         if (res)
6372                 goto out;
6373
6374         res = bond_netlink_init();
6375         if (res)
6376                 goto err_link;
6377
6378         bond_create_debugfs();
6379
6380         for (i = 0; i < max_bonds; i++) {
6381                 res = bond_create(&init_net, NULL);
6382                 if (res)
6383                         goto err;
6384         }
6385
6386         skb_flow_dissector_init(&flow_keys_bonding,
6387                                 flow_keys_bonding_keys,
6388                                 ARRAY_SIZE(flow_keys_bonding_keys));
6389
6390         register_netdevice_notifier(&bond_netdev_notifier);
6391 out:
6392         return res;
6393 err:
6394         bond_destroy_debugfs();
6395         bond_netlink_fini();
6396 err_link:
6397         unregister_pernet_subsys(&bond_net_ops);
6398         goto out;
6399
6400 }
6401
6402 static void __exit bonding_exit(void)
6403 {
6404         unregister_netdevice_notifier(&bond_netdev_notifier);
6405
6406         bond_destroy_debugfs();
6407
6408         bond_netlink_fini();
6409         unregister_pernet_subsys(&bond_net_ops);
6410
6411 #ifdef CONFIG_NET_POLL_CONTROLLER
6412         /* Make sure we don't have an imbalance on our netpoll blocking */
6413         WARN_ON(atomic_read(&netpoll_block_tx));
6414 #endif
6415 }
6416
6417 module_init(bonding_init);
6418 module_exit(bonding_exit);
6419 MODULE_LICENSE("GPL");
6420 MODULE_DESCRIPTION(DRV_DESCRIPTION);
6421 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");