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/interrupt.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/ioport.h>
  41 #include <linux/in.h>
  42 #include <net/ip.h>
  43 #include <linux/ip.h>
  44 #include <linux/tcp.h>
  45 #include <linux/udp.h>
  46 #include <linux/slab.h>
  47 #include <linux/string.h>
  48 #include <linux/init.h>
  49 #include <linux/timer.h>
  50 #include <linux/socket.h>
  51 #include <linux/ctype.h>
  52 #include <linux/inet.h>
  53 #include <linux/bitops.h>
  54 #include <linux/io.h>
  55 #include <asm/dma.h>
  56 #include <linux/uaccess.h>
  57 #include <linux/errno.h>
  58 #include <linux/netdevice.h>
  59 #include <linux/inetdevice.h>
  60 #include <linux/igmp.h>
  61 #include <linux/etherdevice.h>
  62 #include <linux/skbuff.h>
  63 #include <net/sock.h>
  64 #include <linux/rtnetlink.h>
  65 #include <linux/smp.h>
  66 #include <linux/if_ether.h>
  67 #include <net/arp.h>
  68 #include <linux/mii.h>
  69 #include <linux/ethtool.h>
  70 #include <linux/if_vlan.h>
  71 #include <linux/if_bonding.h>
  72 #include <linux/jiffies.h>
  73 #include <linux/preempt.h>
  74 #include <net/route.h>
  75 #include <net/net_namespace.h>
  76 #include <net/netns/generic.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/rculist.h>
  79 #include <net/flow_dissector.h>
  80 #include <net/bonding.h>
  81 #include <net/bond_3ad.h>
  82 #include <net/bond_alb.h>
  83
  84 #include "bonding_priv.h"
  85
  86 /*---------------------------- Module parameters ----------------------------*/
  87
  88 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  89
  90 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  91 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  92 static int num_peer_notif = 1;
  93 static int miimon;
  94 static int updelay;
  95 static int downdelay;
  96 static int use_carrier  = 1;
  97 static char *mode;
  98 static char *primary;
  99 static char *primary_reselect;
 100 static char *lacp_rate;
 101 static int min_links;
 102 static char *ad_select;
 103 static char *xmit_hash_policy;
 104 static int arp_interval;
 105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 106 static char *arp_validate;
 107 static char *arp_all_targets;
 108 static char *fail_over_mac;
 109 static int all_slaves_active;
 110 static struct bond_params bonding_defaults;
 111 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 112 static int packets_per_slave = 1;
 113 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 114
 115 module_param(max_bonds, int, 0);
 116 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 117 module_param(tx_queues, int, 0);
 118 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 119 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 120 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 121                                "failover event (alias of num_unsol_na)");
 122 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 123 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 124                                "failover event (alias of num_grat_arp)");
 125 module_param(miimon, int, 0);
 126 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 127 module_param(updelay, int, 0);
 128 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 129 module_param(downdelay, int, 0);
 130 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 131                             "in milliseconds");
 132 module_param(use_carrier, int, 0);
 133 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 134                               "0 for off, 1 for on (default)");
 135 module_param(mode, charp, 0);
 136 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 137                        "1 for active-backup, 2 for balance-xor, "
 138                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 139                        "6 for balance-alb");
 140 module_param(primary, charp, 0);
 141 MODULE_PARM_DESC(primary, "Primary network device to use");
 142 module_param(primary_reselect, charp, 0);
 143 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 144                                    "once it comes up; "
 145                                    "0 for always (default), "
 146                                    "1 for only if speed of primary is "
 147                                    "better, "
 148                                    "2 for only on active slave "
 149                                    "failure");
 150 module_param(lacp_rate, charp, 0);
 151 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 152                             "0 for slow, 1 for fast");
 153 module_param(ad_select, charp, 0);
 154 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 155                             "0 for stable (default), 1 for bandwidth, "
 156                             "2 for count");
 157 module_param(min_links, int, 0);
 158 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 159
 160 module_param(xmit_hash_policy, charp, 0);
 161 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
 162                                    "0 for layer 2 (default), 1 for layer 3+4, "
 163                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 164                                    "4 for encap layer 3+4");
 165 module_param(arp_interval, int, 0);
 166 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 167 module_param_array(arp_ip_target, charp, NULL, 0);
 168 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 169 module_param(arp_validate, charp, 0);
 170 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 171                                "0 for none (default), 1 for active, "
 172                                "2 for backup, 3 for all");
 173 module_param(arp_all_targets, charp, 0);
 174 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 175 module_param(fail_over_mac, charp, 0);
 176 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 177                                 "the same MAC; 0 for none (default), "
 178                                 "1 for active, 2 for follow");
 179 module_param(all_slaves_active, int, 0);
 180 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 181                                      "by setting active flag for all slaves; "
 182                                      "0 for never (default), 1 for always.");
 183 module_param(resend_igmp, int, 0);
 184 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 185                               "link failure");
 186 module_param(packets_per_slave, int, 0);
 187 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 188                                     "mode; 0 for a random slave, 1 packet per "
 189                                     "slave (default), >1 packets per slave.");
 190 module_param(lp_interval, uint, 0);
 191 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 192                               "the bonding driver sends learning packets to "
 193                               "each slaves peer switch. The default is 1.");
 194
 195 /*----------------------------- Global variables ----------------------------*/
 196
 197 #ifdef CONFIG_NET_POLL_CONTROLLER
 198 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 199 #endif
 200
 201 unsigned int bond_net_id __read_mostly;
 202
 203 /*-------------------------- Forward declarations ---------------------------*/
 204
 205 static int bond_init(struct net_device *bond_dev);
 206 static void bond_uninit(struct net_device *bond_dev);
 207 static void bond_get_stats(struct net_device *bond_dev,
 208                            struct rtnl_link_stats64 *stats);
 209 static void bond_slave_arr_handler(struct work_struct *work);
 210 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 211                                   int mod);
 212 static void bond_netdev_notify_work(struct work_struct *work);
 213
 214 /*---------------------------- General routines -----------------------------*/
 215
 216 const char *bond_mode_name(int mode)
 217 {
 218         static const char *names[] = {
 219                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 220                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 221                 [BOND_MODE_XOR] = "load balancing (xor)",
 222                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 223                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 224                 [BOND_MODE_TLB] = "transmit load balancing",
 225                 [BOND_MODE_ALB] = "adaptive load balancing",
 226         };
 227
 228         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 229                 return "unknown";
 230
 231         return names[mode];
 232 }
 233
 234 /*---------------------------------- VLAN -----------------------------------*/
 235
 236 /**
 237  * bond_dev_queue_xmit - Prepare skb for xmit.
 238  *
 239  * @bond: bond device that got this skb for tx.
 240  * @skb: hw accel VLAN tagged skb to transmit
 241  * @slave_dev: slave that is supposed to xmit this skbuff
 242  */
 243 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 244                         struct net_device *slave_dev)
 245 {
 246         skb->dev = slave_dev;
 247
 248         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 249                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 250         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 251
 252         if (unlikely(netpoll_tx_running(bond->dev)))
 253                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 254         else
 255                 dev_queue_xmit(skb);
 256 }
 257
 258 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 259  * We don't protect the slave list iteration with a lock because:
 260  * a. This operation is performed in IOCTL context,
 261  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 262  * c. Holding a lock with BH disabled while directly calling a base driver
 263  *    entry point is generally a BAD idea.
 264  *
 265  * The design of synchronization/protection for this operation in the 8021q
 266  * module is good for one or more VLAN devices over a single physical device
 267  * and cannot be extended for a teaming solution like bonding, so there is a
 268  * potential race condition here where a net device from the vlan group might
 269  * be referenced (either by a base driver or the 8021q code) while it is being
 270  * removed from the system. However, it turns out we're not making matters
 271  * worse, and if it works for regular VLAN usage it will work here too.
 272 */
 273
 274 /**
 275  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 276  * @bond_dev: bonding net device that got called
 277  * @vid: vlan id being added
 278  */
 279 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 280                                 __be16 proto, u16 vid)
 281 {
 282         struct bonding *bond = netdev_priv(bond_dev);
 283         struct slave *slave, *rollback_slave;
 284         struct list_head *iter;
 285         int res;
 286
 287         bond_for_each_slave(bond, slave, iter) {
 288                 res = vlan_vid_add(slave->dev, proto, vid);
 289                 if (res)
 290                         goto unwind;
 291         }
 292
 293         return 0;
 294
 295 unwind:
 296         /* unwind to the slave that failed */
 297         bond_for_each_slave(bond, rollback_slave, iter) {
 298                 if (rollback_slave == slave)
 299                         break;
 300
 301                 vlan_vid_del(rollback_slave->dev, proto, vid);
 302         }
 303
 304         return res;
 305 }
 306
 307 /**
 308  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 309  * @bond_dev: bonding net device that got called
 310  * @vid: vlan id being removed
 311  */
 312 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 313                                  __be16 proto, u16 vid)
 314 {
 315         struct bonding *bond = netdev_priv(bond_dev);
 316         struct list_head *iter;
 317         struct slave *slave;
 318
 319         bond_for_each_slave(bond, slave, iter)
 320                 vlan_vid_del(slave->dev, proto, vid);
 321
 322         if (bond_is_lb(bond))
 323                 bond_alb_clear_vlan(bond, vid);
 324
 325         return 0;
 326 }
 327
 328 /*------------------------------- Link status -------------------------------*/
 329
 330 /* Set the carrier state for the master according to the state of its
 331  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 332  * do special 802.3ad magic.
 333  *
 334  * Returns zero if carrier state does not change, nonzero if it does.
 335  */
 336 int bond_set_carrier(struct bonding *bond)
 337 {
 338         struct list_head *iter;
 339         struct slave *slave;
 340
 341         if (!bond_has_slaves(bond))
 342                 goto down;
 343
 344         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 345                 return bond_3ad_set_carrier(bond);
 346
 347         bond_for_each_slave(bond, slave, iter) {
 348                 if (slave->link == BOND_LINK_UP) {
 349                         if (!netif_carrier_ok(bond->dev)) {
 350                                 netif_carrier_on(bond->dev);
 351                                 return 1;
 352                         }
 353                         return 0;
 354                 }
 355         }
 356
 357 down:
 358         if (netif_carrier_ok(bond->dev)) {
 359                 netif_carrier_off(bond->dev);
 360                 return 1;
 361         }
 362         return 0;
 363 }
 364
 365 /* Get link speed and duplex from the slave's base driver
 366  * using ethtool. If for some reason the call fails or the
 367  * values are invalid, set speed and duplex to -1,
 368  * and return. Return 1 if speed or duplex settings are
 369  * UNKNOWN; 0 otherwise.
 370  */
 371 static int bond_update_speed_duplex(struct slave *slave)
 372 {
 373         struct net_device *slave_dev = slave->dev;
 374         struct ethtool_link_ksettings ecmd;
 375         int res;
 376
 377         slave->speed = SPEED_UNKNOWN;
 378         slave->duplex = DUPLEX_UNKNOWN;
 379
 380         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 381         if (res < 0)
 382                 return 1;
 383         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 384                 return 1;
 385         switch (ecmd.base.duplex) {
 386         case DUPLEX_FULL:
 387         case DUPLEX_HALF:
 388                 break;
 389         default:
 390                 return 1;
 391         }
 392
 393         slave->speed = ecmd.base.speed;
 394         slave->duplex = ecmd.base.duplex;
 395
 396         return 0;
 397 }
 398
 399 const char *bond_slave_link_status(s8 link)
 400 {
 401         switch (link) {
 402         case BOND_LINK_UP:
 403                 return "up";
 404         case BOND_LINK_FAIL:
 405                 return "going down";
 406         case BOND_LINK_DOWN:
 407                 return "down";
 408         case BOND_LINK_BACK:
 409                 return "going back";
 410         default:
 411                 return "unknown";
 412         }
 413 }
 414
 415 /* if <dev> supports MII link status reporting, check its link status.
 416  *
 417  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 418  * depending upon the setting of the use_carrier parameter.
 419  *
 420  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 421  * can't tell and just pretend it is), or 0, meaning that the link is
 422  * down.
 423  *
 424  * If reporting is non-zero, instead of faking link up, return -1 if
 425  * both ETHTOOL and MII ioctls fail (meaning the device does not
 426  * support them).  If use_carrier is set, return whatever it says.
 427  * It'd be nice if there was a good way to tell if a driver supports
 428  * netif_carrier, but there really isn't.
 429  */
 430 static int bond_check_dev_link(struct bonding *bond,
 431                                struct net_device *slave_dev, int reporting)
 432 {
 433         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 434         int (*ioctl)(struct net_device *, struct ifreq *, int);
 435         struct ifreq ifr;
 436         struct mii_ioctl_data *mii;
 437
 438         if (!reporting && !netif_running(slave_dev))
 439                 return 0;
 440
 441         if (bond->params.use_carrier)
 442                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 443
 444         /* Try to get link status using Ethtool first. */
 445         if (slave_dev->ethtool_ops->get_link)
 446                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 447                         BMSR_LSTATUS : 0;
 448
 449         /* Ethtool can't be used, fallback to MII ioctls. */
 450         ioctl = slave_ops->ndo_do_ioctl;
 451         if (ioctl) {
 452                 /* TODO: set pointer to correct ioctl on a per team member
 453                  *       bases to make this more efficient. that is, once
 454                  *       we determine the correct ioctl, we will always
 455                  *       call it and not the others for that team
 456                  *       member.
 457                  */
 458
 459                 /* We cannot assume that SIOCGMIIPHY will also read a
 460                  * register; not all network drivers (e.g., e100)
 461                  * support that.
 462                  */
 463
 464                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 465                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 466                 mii = if_mii(&ifr);
 467                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 468                         mii->reg_num = MII_BMSR;
 469                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 470                                 return mii->val_out & BMSR_LSTATUS;
 471                 }
 472         }
 473
 474         /* If reporting, report that either there's no dev->do_ioctl,
 475          * or both SIOCGMIIREG and get_link failed (meaning that we
 476          * cannot report link status).  If not reporting, pretend
 477          * we're ok.
 478          */
 479         return reporting ? -1 : BMSR_LSTATUS;
 480 }
 481
 482 /*----------------------------- Multicast list ------------------------------*/
 483
 484 /* Push the promiscuity flag down to appropriate slaves */
 485 static int bond_set_promiscuity(struct bonding *bond, int inc)
 486 {
 487         struct list_head *iter;
 488         int err = 0;
 489
 490         if (bond_uses_primary(bond)) {
 491                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 492
 493                 if (curr_active)
 494                         err = dev_set_promiscuity(curr_active->dev, inc);
 495         } else {
 496                 struct slave *slave;
 497
 498                 bond_for_each_slave(bond, slave, iter) {
 499                         err = dev_set_promiscuity(slave->dev, inc);
 500                         if (err)
 501                                 return err;
 502                 }
 503         }
 504         return err;
 505 }
 506
 507 /* Push the allmulti flag down to all slaves */
 508 static int bond_set_allmulti(struct bonding *bond, int inc)
 509 {
 510         struct list_head *iter;
 511         int err = 0;
 512
 513         if (bond_uses_primary(bond)) {
 514                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 515
 516                 if (curr_active)
 517                         err = dev_set_allmulti(curr_active->dev, inc);
 518         } else {
 519                 struct slave *slave;
 520
 521                 bond_for_each_slave(bond, slave, iter) {
 522                         err = dev_set_allmulti(slave->dev, inc);
 523                         if (err)
 524                                 return err;
 525                 }
 526         }
 527         return err;
 528 }
 529
 530 /* Retrieve the list of registered multicast addresses for the bonding
 531  * device and retransmit an IGMP JOIN request to the current active
 532  * slave.
 533  */
 534 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 535 {
 536         struct bonding *bond = container_of(work, struct bonding,
 537                                             mcast_work.work);
 538
 539         if (!rtnl_trylock()) {
 540                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 541                 return;
 542         }
 543         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 544
 545         if (bond->igmp_retrans > 1) {
 546                 bond->igmp_retrans--;
 547                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 548         }
 549         rtnl_unlock();
 550 }
 551
 552 /* Flush bond's hardware addresses from slave */
 553 static void bond_hw_addr_flush(struct net_device *bond_dev,
 554                                struct net_device *slave_dev)
 555 {
 556         struct bonding *bond = netdev_priv(bond_dev);
 557
 558         dev_uc_unsync(slave_dev, bond_dev);
 559         dev_mc_unsync(slave_dev, bond_dev);
 560
 561         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 562                 /* del lacpdu mc addr from mc list */
 563                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 564
 565                 dev_mc_del(slave_dev, lacpdu_multicast);
 566         }
 567 }
 568
 569 /*--------------------------- Active slave change ---------------------------*/
 570
 571 /* Update the hardware address list and promisc/allmulti for the new and
 572  * old active slaves (if any).  Modes that are not using primary keep all
 573  * slaves up date at all times; only the modes that use primary need to call
 574  * this function to swap these settings during a failover.
 575  */
 576 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 577                               struct slave *old_active)
 578 {
 579         if (old_active) {
 580                 if (bond->dev->flags & IFF_PROMISC)
 581                         dev_set_promiscuity(old_active->dev, -1);
 582
 583                 if (bond->dev->flags & IFF_ALLMULTI)
 584                         dev_set_allmulti(old_active->dev, -1);
 585
 586                 bond_hw_addr_flush(bond->dev, old_active->dev);
 587         }
 588
 589         if (new_active) {
 590                 /* FIXME: Signal errors upstream. */
 591                 if (bond->dev->flags & IFF_PROMISC)
 592                         dev_set_promiscuity(new_active->dev, 1);
 593
 594                 if (bond->dev->flags & IFF_ALLMULTI)
 595                         dev_set_allmulti(new_active->dev, 1);
 596
 597                 netif_addr_lock_bh(bond->dev);
 598                 dev_uc_sync(new_active->dev, bond->dev);
 599                 dev_mc_sync(new_active->dev, bond->dev);
 600                 netif_addr_unlock_bh(bond->dev);
 601         }
 602 }
 603
 604 /**
 605  * bond_set_dev_addr - clone slave's address to bond
 606  * @bond_dev: bond net device
 607  * @slave_dev: slave net device
 608  *
 609  * Should be called with RTNL held.
 610  */
 611 static int bond_set_dev_addr(struct net_device *bond_dev,
 612                              struct net_device *slave_dev)
 613 {
 614         int err;
 615
 616         slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 617                   bond_dev, slave_dev, slave_dev->addr_len);
 618         err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 619         if (err)
 620                 return err;
 621
 622         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 623         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 624         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 625         return 0;
 626 }
 627
 628 static struct slave *bond_get_old_active(struct bonding *bond,
 629                                          struct slave *new_active)
 630 {
 631         struct slave *slave;
 632         struct list_head *iter;
 633
 634         bond_for_each_slave(bond, slave, iter) {
 635                 if (slave == new_active)
 636                         continue;
 637
 638                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 639                         return slave;
 640         }
 641
 642         return NULL;
 643 }
 644
 645 /* bond_do_fail_over_mac
 646  *
 647  * Perform special MAC address swapping for fail_over_mac settings
 648  *
 649  * Called with RTNL
 650  */
 651 static void bond_do_fail_over_mac(struct bonding *bond,
 652                                   struct slave *new_active,
 653                                   struct slave *old_active)
 654 {
 655         u8 tmp_mac[MAX_ADDR_LEN];
 656         struct sockaddr_storage ss;
 657         int rv;
 658
 659         switch (bond->params.fail_over_mac) {
 660         case BOND_FOM_ACTIVE:
 661                 if (new_active) {
 662                         rv = bond_set_dev_addr(bond->dev, new_active->dev);
 663                         if (rv)
 664                                 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
 665                                           -rv);
 666                 }
 667                 break;
 668         case BOND_FOM_FOLLOW:
 669                 /* if new_active && old_active, swap them
 670                  * if just old_active, do nothing (going to no active slave)
 671                  * if just new_active, set new_active to bond's MAC
 672                  */
 673                 if (!new_active)
 674                         return;
 675
 676                 if (!old_active)
 677                         old_active = bond_get_old_active(bond, new_active);
 678
 679                 if (old_active) {
 680                         bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 681                                           new_active->dev->addr_len);
 682                         bond_hw_addr_copy(ss.__data,
 683                                           old_active->dev->dev_addr,
 684                                           old_active->dev->addr_len);
 685                         ss.ss_family = new_active->dev->type;
 686                 } else {
 687                         bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 688                                           bond->dev->addr_len);
 689                         ss.ss_family = bond->dev->type;
 690                 }
 691
 692                 rv = dev_set_mac_address(new_active->dev,
 693                                          (struct sockaddr *)&ss, NULL);
 694                 if (rv) {
 695                         slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
 696                                   -rv);
 697                         goto out;
 698                 }
 699
 700                 if (!old_active)
 701                         goto out;
 702
 703                 bond_hw_addr_copy(ss.__data, tmp_mac,
 704                                   new_active->dev->addr_len);
 705                 ss.ss_family = old_active->dev->type;
 706
 707                 rv = dev_set_mac_address(old_active->dev,
 708                                          (struct sockaddr *)&ss, NULL);
 709                 if (rv)
 710                         slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
 711                                   -rv);
 712 out:
 713                 break;
 714         default:
 715                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 716                            bond->params.fail_over_mac);
 717                 break;
 718         }
 719
 720 }
 721
 722 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
 723 {
 724         struct slave *prim = rtnl_dereference(bond->primary_slave);
 725         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 726
 727         if (!prim || prim->link != BOND_LINK_UP) {
 728                 if (!curr || curr->link != BOND_LINK_UP)
 729                         return NULL;
 730                 return curr;
 731         }
 732
 733         if (bond->force_primary) {
 734                 bond->force_primary = false;
 735                 return prim;
 736         }
 737
 738         if (!curr || curr->link != BOND_LINK_UP)
 739                 return prim;
 740
 741         /* At this point, prim and curr are both up */
 742         switch (bond->params.primary_reselect) {
 743         case BOND_PRI_RESELECT_ALWAYS:
 744                 return prim;
 745         case BOND_PRI_RESELECT_BETTER:
 746                 if (prim->speed < curr->speed)
 747                         return curr;
 748                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
 749                         return curr;
 750                 return prim;
 751         case BOND_PRI_RESELECT_FAILURE:
 752                 return curr;
 753         default:
 754                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
 755                            bond->params.primary_reselect);
 756                 return curr;
 757         }
 758 }
 759
 760 /**
 761  * bond_find_best_slave - select the best available slave to be the active one
 762  * @bond: our bonding struct
 763  */
 764 static struct slave *bond_find_best_slave(struct bonding *bond)
 765 {
 766         struct slave *slave, *bestslave = NULL;
 767         struct list_head *iter;
 768         int mintime = bond->params.updelay;
 769
 770         slave = bond_choose_primary_or_current(bond);
 771         if (slave)
 772                 return slave;
 773
 774         bond_for_each_slave(bond, slave, iter) {
 775                 if (slave->link == BOND_LINK_UP)
 776                         return slave;
 777                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 778                     slave->delay < mintime) {
 779                         mintime = slave->delay;
 780                         bestslave = slave;
 781                 }
 782         }
 783
 784         return bestslave;
 785 }
 786
 787 static bool bond_should_notify_peers(struct bonding *bond)
 788 {
 789         struct slave *slave;
 790
 791         rcu_read_lock();
 792         slave = rcu_dereference(bond->curr_active_slave);
 793         rcu_read_unlock();
 794
 795         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 796                    slave ? slave->dev->name : "NULL");
 797
 798         if (!slave || !bond->send_peer_notif ||
 799             bond->send_peer_notif %
 800             max(1, bond->params.peer_notif_delay) != 0 ||
 801             !netif_carrier_ok(bond->dev) ||
 802             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 803                 return false;
 804
 805         return true;
 806 }
 807
 808 /**
 809  * change_active_interface - change the active slave into the specified one
 810  * @bond: our bonding struct
 811  * @new: the new slave to make the active one
 812  *
 813  * Set the new slave to the bond's settings and unset them on the old
 814  * curr_active_slave.
 815  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 816  *
 817  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 818  * because it is apparently the best available slave we have, even though its
 819  * updelay hasn't timed out yet.
 820  *
 821  * Caller must hold RTNL.
 822  */
 823 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 824 {
 825         struct slave *old_active;
 826
 827         ASSERT_RTNL();
 828
 829         old_active = rtnl_dereference(bond->curr_active_slave);
 830
 831         if (old_active == new_active)
 832                 return;
 833
 834         if (new_active) {
 835                 new_active->last_link_up = jiffies;
 836
 837                 if (new_active->link == BOND_LINK_BACK) {
 838                         if (bond_uses_primary(bond)) {
 839                                 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
 840                                            (bond->params.updelay - new_active->delay) * bond->params.miimon);
 841                         }
 842
 843                         new_active->delay = 0;
 844                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
 845                                                   BOND_SLAVE_NOTIFY_NOW);
 846
 847                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 848                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 849
 850                         if (bond_is_lb(bond))
 851                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 852                 } else {
 853                         if (bond_uses_primary(bond)) {
 854                                 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
 855                         }
 856                 }
 857         }
 858
 859         if (bond_uses_primary(bond))
 860                 bond_hw_addr_swap(bond, new_active, old_active);
 861
 862         if (bond_is_lb(bond)) {
 863                 bond_alb_handle_active_change(bond, new_active);
 864                 if (old_active)
 865                         bond_set_slave_inactive_flags(old_active,
 866                                                       BOND_SLAVE_NOTIFY_NOW);
 867                 if (new_active)
 868                         bond_set_slave_active_flags(new_active,
 869                                                     BOND_SLAVE_NOTIFY_NOW);
 870         } else {
 871                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 872         }
 873
 874         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
 875                 if (old_active)
 876                         bond_set_slave_inactive_flags(old_active,
 877                                                       BOND_SLAVE_NOTIFY_NOW);
 878
 879                 if (new_active) {
 880                         bool should_notify_peers = false;
 881
 882                         bond_set_slave_active_flags(new_active,
 883                                                     BOND_SLAVE_NOTIFY_NOW);
 884
 885                         if (bond->params.fail_over_mac)
 886                                 bond_do_fail_over_mac(bond, new_active,
 887                                                       old_active);
 888
 889                         if (netif_running(bond->dev)) {
 890                                 bond->send_peer_notif =
 891                                         bond->params.num_peer_notif *
 892                                         max(1, bond->params.peer_notif_delay);
 893                                 should_notify_peers =
 894                                         bond_should_notify_peers(bond);
 895                         }
 896
 897                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 898                         if (should_notify_peers) {
 899                                 bond->send_peer_notif--;
 900                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 901                                                          bond->dev);
 902                         }
 903                 }
 904         }
 905
 906         /* resend IGMP joins since active slave has changed or
 907          * all were sent on curr_active_slave.
 908          * resend only if bond is brought up with the affected
 909          * bonding modes and the retransmission is enabled
 910          */
 911         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 912             ((bond_uses_primary(bond) && new_active) ||
 913              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
 914                 bond->igmp_retrans = bond->params.resend_igmp;
 915                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 916         }
 917 }
 918
 919 /**
 920  * bond_select_active_slave - select a new active slave, if needed
 921  * @bond: our bonding struct
 922  *
 923  * This functions should be called when one of the following occurs:
 924  * - The old curr_active_slave has been released or lost its link.
 925  * - The primary_slave has got its link back.
 926  * - A slave has got its link back and there's no old curr_active_slave.
 927  *
 928  * Caller must hold RTNL.
 929  */
 930 void bond_select_active_slave(struct bonding *bond)
 931 {
 932         struct slave *best_slave;
 933         int rv;
 934
 935         ASSERT_RTNL();
 936
 937         best_slave = bond_find_best_slave(bond);
 938         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
 939                 bond_change_active_slave(bond, best_slave);
 940                 rv = bond_set_carrier(bond);
 941                 if (!rv)
 942                         return;
 943
 944                 if (netif_carrier_ok(bond->dev))
 945                         netdev_info(bond->dev, "active interface up!\n");
 946                 else
 947                         netdev_info(bond->dev, "now running without any active interface!\n");
 948         }
 949 }
 950
 951 #ifdef CONFIG_NET_POLL_CONTROLLER
 952 static inline int slave_enable_netpoll(struct slave *slave)
 953 {
 954         struct netpoll *np;
 955         int err = 0;
 956
 957         np = kzalloc(sizeof(*np), GFP_KERNEL);
 958         err = -ENOMEM;
 959         if (!np)
 960                 goto out;
 961
 962         err = __netpoll_setup(np, slave->dev);
 963         if (err) {
 964                 kfree(np);
 965                 goto out;
 966         }
 967         slave->np = np;
 968 out:
 969         return err;
 970 }
 971 static inline void slave_disable_netpoll(struct slave *slave)
 972 {
 973         struct netpoll *np = slave->np;
 974
 975         if (!np)
 976                 return;
 977
 978         slave->np = NULL;
 979
 980         __netpoll_free(np);
 981 }
 982
 983 static void bond_poll_controller(struct net_device *bond_dev)
 984 {
 985         struct bonding *bond = netdev_priv(bond_dev);
 986         struct slave *slave = NULL;
 987         struct list_head *iter;
 988         struct ad_info ad_info;
 989
 990         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 991                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
 992                         return;
 993
 994         bond_for_each_slave_rcu(bond, slave, iter) {
 995                 if (!bond_slave_is_up(slave))
 996                         continue;
 997
 998                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 999                         struct aggregator *agg =
1000                             SLAVE_AD_INFO(slave)->port.aggregator;
1001
1002                         if (agg &&
1003                             agg->aggregator_identifier != ad_info.aggregator_id)
1004                                 continue;
1005                 }
1006
1007                 netpoll_poll_dev(slave->dev);
1008         }
1009 }
1010
1011 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1012 {
1013         struct bonding *bond = netdev_priv(bond_dev);
1014         struct list_head *iter;
1015         struct slave *slave;
1016
1017         bond_for_each_slave(bond, slave, iter)
1018                 if (bond_slave_is_up(slave))
1019                         slave_disable_netpoll(slave);
1020 }
1021
1022 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1023 {
1024         struct bonding *bond = netdev_priv(dev);
1025         struct list_head *iter;
1026         struct slave *slave;
1027         int err = 0;
1028
1029         bond_for_each_slave(bond, slave, iter) {
1030                 err = slave_enable_netpoll(slave);
1031                 if (err) {
1032                         bond_netpoll_cleanup(dev);
1033                         break;
1034                 }
1035         }
1036         return err;
1037 }
1038 #else
1039 static inline int slave_enable_netpoll(struct slave *slave)
1040 {
1041         return 0;
1042 }
1043 static inline void slave_disable_netpoll(struct slave *slave)
1044 {
1045 }
1046 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1047 {
1048 }
1049 #endif
1050
1051 /*---------------------------------- IOCTL ----------------------------------*/
1052
1053 static netdev_features_t bond_fix_features(struct net_device *dev,
1054                                            netdev_features_t features)
1055 {
1056         struct bonding *bond = netdev_priv(dev);
1057         struct list_head *iter;
1058         netdev_features_t mask;
1059         struct slave *slave;
1060
1061         mask = features;
1062
1063         features &= ~NETIF_F_ONE_FOR_ALL;
1064         features |= NETIF_F_ALL_FOR_ALL;
1065
1066         bond_for_each_slave(bond, slave, iter) {
1067                 features = netdev_increment_features(features,
1068                                                      slave->dev->features,
1069                                                      mask);
1070         }
1071         features = netdev_add_tso_features(features, mask);
1072
1073         return features;
1074 }
1075
1076 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1077                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1078                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1079
1080 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1081                                  NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1082
1083 #define BOND_MPLS_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1084                                  NETIF_F_ALL_TSO)
1085
1086 static void bond_compute_features(struct bonding *bond)
1087 {
1088         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1089                                         IFF_XMIT_DST_RELEASE_PERM;
1090         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1091         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1092         netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1093         struct net_device *bond_dev = bond->dev;
1094         struct list_head *iter;
1095         struct slave *slave;
1096         unsigned short max_hard_header_len = ETH_HLEN;
1097         unsigned int gso_max_size = GSO_MAX_SIZE;
1098         u16 gso_max_segs = GSO_MAX_SEGS;
1099
1100         if (!bond_has_slaves(bond))
1101                 goto done;
1102         vlan_features &= NETIF_F_ALL_FOR_ALL;
1103         mpls_features &= NETIF_F_ALL_FOR_ALL;
1104
1105         bond_for_each_slave(bond, slave, iter) {
1106                 vlan_features = netdev_increment_features(vlan_features,
1107                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1108
1109                 enc_features = netdev_increment_features(enc_features,
1110                                                          slave->dev->hw_enc_features,
1111                                                          BOND_ENC_FEATURES);
1112
1113                 mpls_features = netdev_increment_features(mpls_features,
1114                                                           slave->dev->mpls_features,
1115                                                           BOND_MPLS_FEATURES);
1116
1117                 dst_release_flag &= slave->dev->priv_flags;
1118                 if (slave->dev->hard_header_len > max_hard_header_len)
1119                         max_hard_header_len = slave->dev->hard_header_len;
1120
1121                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1122                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1123         }
1124         bond_dev->hard_header_len = max_hard_header_len;
1125
1126 done:
1127         bond_dev->vlan_features = vlan_features;
1128         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1129                                     NETIF_F_HW_VLAN_CTAG_TX |
1130                                     NETIF_F_HW_VLAN_STAG_TX |
1131                                     NETIF_F_GSO_UDP_L4;
1132         bond_dev->mpls_features = mpls_features;
1133         bond_dev->gso_max_segs = gso_max_segs;
1134         netif_set_gso_max_size(bond_dev, gso_max_size);
1135
1136         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1137         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1138             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1139                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1140
1141         netdev_change_features(bond_dev);
1142 }
1143
1144 static void bond_setup_by_slave(struct net_device *bond_dev,
1145                                 struct net_device *slave_dev)
1146 {
1147         bond_dev->header_ops        = slave_dev->header_ops;
1148
1149         bond_dev->type              = slave_dev->type;
1150         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1151         bond_dev->addr_len          = slave_dev->addr_len;
1152
1153         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1154                 slave_dev->addr_len);
1155 }
1156
1157 /* On bonding slaves other than the currently active slave, suppress
1158  * duplicates except for alb non-mcast/bcast.
1159  */
1160 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1161                                             struct slave *slave,
1162                                             struct bonding *bond)
1163 {
1164         if (bond_is_slave_inactive(slave)) {
1165                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1166                     skb->pkt_type != PACKET_BROADCAST &&
1167                     skb->pkt_type != PACKET_MULTICAST)
1168                         return false;
1169                 return true;
1170         }
1171         return false;
1172 }
1173
1174 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1175 {
1176         struct sk_buff *skb = *pskb;
1177         struct slave *slave;
1178         struct bonding *bond;
1179         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1180                           struct slave *);
1181         int ret = RX_HANDLER_ANOTHER;
1182
1183         skb = skb_share_check(skb, GFP_ATOMIC);
1184         if (unlikely(!skb))
1185                 return RX_HANDLER_CONSUMED;
1186
1187         *pskb = skb;
1188
1189         slave = bond_slave_get_rcu(skb->dev);
1190         bond = slave->bond;
1191
1192         recv_probe = READ_ONCE(bond->recv_probe);
1193         if (recv_probe) {
1194                 ret = recv_probe(skb, bond, slave);
1195                 if (ret == RX_HANDLER_CONSUMED) {
1196                         consume_skb(skb);
1197                         return ret;
1198                 }
1199         }
1200
1201         /*
1202          * For packets determined by bond_should_deliver_exact_match() call to
1203          * be suppressed we want to make an exception for link-local packets.
1204          * This is necessary for e.g. LLDP daemons to be able to monitor
1205          * inactive slave links without being forced to bind to them
1206          * explicitly.
1207          *
1208          * At the same time, packets that are passed to the bonding master
1209          * (including link-local ones) can have their originating interface
1210          * determined via PACKET_ORIGDEV socket option.
1211          */
1212         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1213                 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1214                         return RX_HANDLER_PASS;
1215                 return RX_HANDLER_EXACT;
1216         }
1217
1218         skb->dev = bond->dev;
1219
1220         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1221             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1222             skb->pkt_type == PACKET_HOST) {
1223
1224                 if (unlikely(skb_cow_head(skb,
1225                                           skb->data - skb_mac_header(skb)))) {
1226                         kfree_skb(skb);
1227                         return RX_HANDLER_CONSUMED;
1228                 }
1229                 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1230                                   bond->dev->addr_len);
1231         }
1232
1233         return ret;
1234 }
1235
1236 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1237 {
1238         switch (BOND_MODE(bond)) {
1239         case BOND_MODE_ROUNDROBIN:
1240                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1241         case BOND_MODE_ACTIVEBACKUP:
1242                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1243         case BOND_MODE_BROADCAST:
1244                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1245         case BOND_MODE_XOR:
1246         case BOND_MODE_8023AD:
1247                 return NETDEV_LAG_TX_TYPE_HASH;
1248         default:
1249                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1250         }
1251 }
1252
1253 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1254                                                enum netdev_lag_tx_type type)
1255 {
1256         if (type != NETDEV_LAG_TX_TYPE_HASH)
1257                 return NETDEV_LAG_HASH_NONE;
1258
1259         switch (bond->params.xmit_policy) {
1260         case BOND_XMIT_POLICY_LAYER2:
1261                 return NETDEV_LAG_HASH_L2;
1262         case BOND_XMIT_POLICY_LAYER34:
1263                 return NETDEV_LAG_HASH_L34;
1264         case BOND_XMIT_POLICY_LAYER23:
1265                 return NETDEV_LAG_HASH_L23;
1266         case BOND_XMIT_POLICY_ENCAP23:
1267                 return NETDEV_LAG_HASH_E23;
1268         case BOND_XMIT_POLICY_ENCAP34:
1269                 return NETDEV_LAG_HASH_E34;
1270         default:
1271                 return NETDEV_LAG_HASH_UNKNOWN;
1272         }
1273 }
1274
1275 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1276                                       struct netlink_ext_ack *extack)
1277 {
1278         struct netdev_lag_upper_info lag_upper_info;
1279         enum netdev_lag_tx_type type;
1280
1281         type = bond_lag_tx_type(bond);
1282         lag_upper_info.tx_type = type;
1283         lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1284
1285         return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1286                                             &lag_upper_info, extack);
1287 }
1288
1289 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1290 {
1291         netdev_upper_dev_unlink(slave->dev, bond->dev);
1292         slave->dev->flags &= ~IFF_SLAVE;
1293 }
1294
1295 static struct slave *bond_alloc_slave(struct bonding *bond)
1296 {
1297         struct slave *slave = NULL;
1298
1299         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1300         if (!slave)
1301                 return NULL;
1302
1303         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1304                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1305                                                GFP_KERNEL);
1306                 if (!SLAVE_AD_INFO(slave)) {
1307                         kfree(slave);
1308                         return NULL;
1309                 }
1310         }
1311         INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1312
1313         return slave;
1314 }
1315
1316 static void bond_free_slave(struct slave *slave)
1317 {
1318         struct bonding *bond = bond_get_bond_by_slave(slave);
1319
1320         cancel_delayed_work_sync(&slave->notify_work);
1321         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1322                 kfree(SLAVE_AD_INFO(slave));
1323
1324         kfree(slave);
1325 }
1326
1327 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1328 {
1329         info->bond_mode = BOND_MODE(bond);
1330         info->miimon = bond->params.miimon;
1331         info->num_slaves = bond->slave_cnt;
1332 }
1333
1334 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1335 {
1336         strcpy(info->slave_name, slave->dev->name);
1337         info->link = slave->link;
1338         info->state = bond_slave_state(slave);
1339         info->link_failure_count = slave->link_failure_count;
1340 }
1341
1342 static void bond_netdev_notify_work(struct work_struct *_work)
1343 {
1344         struct slave *slave = container_of(_work, struct slave,
1345                                            notify_work.work);
1346
1347         if (rtnl_trylock()) {
1348                 struct netdev_bonding_info binfo;
1349
1350                 bond_fill_ifslave(slave, &binfo.slave);
1351                 bond_fill_ifbond(slave->bond, &binfo.master);
1352                 netdev_bonding_info_change(slave->dev, &binfo);
1353                 rtnl_unlock();
1354         } else {
1355                 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1356         }
1357 }
1358
1359 void bond_queue_slave_event(struct slave *slave)
1360 {
1361         queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1362 }
1363
1364 void bond_lower_state_changed(struct slave *slave)
1365 {
1366         struct netdev_lag_lower_state_info info;
1367
1368         info.link_up = slave->link == BOND_LINK_UP ||
1369                        slave->link == BOND_LINK_FAIL;
1370         info.tx_enabled = bond_is_active_slave(slave);
1371         netdev_lower_state_changed(slave->dev, &info);
1372 }
1373
1374 /* enslave device <slave> to bond device <master> */
1375 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1376                  struct netlink_ext_ack *extack)
1377 {
1378         struct bonding *bond = netdev_priv(bond_dev);
1379         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1380         struct slave *new_slave = NULL, *prev_slave;
1381         struct sockaddr_storage ss;
1382         int link_reporting;
1383         int res = 0, i;
1384
1385         if (!bond->params.use_carrier &&
1386             slave_dev->ethtool_ops->get_link == NULL &&
1387             slave_ops->ndo_do_ioctl == NULL) {
1388                 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1389         }
1390
1391         /* already in-use? */
1392         if (netdev_is_rx_handler_busy(slave_dev)) {
1393                 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1394                 slave_err(bond_dev, slave_dev,
1395                           "Error: Device is in use and cannot be enslaved\n");
1396                 return -EBUSY;
1397         }
1398
1399         if (bond_dev == slave_dev) {
1400                 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1401                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1402                 return -EPERM;
1403         }
1404
1405         /* vlan challenged mutual exclusion */
1406         /* no need to lock since we're protected by rtnl_lock */
1407         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1408                 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1409                 if (vlan_uses_dev(bond_dev)) {
1410                         NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1411                         slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1412                         return -EPERM;
1413                 } else {
1414                         slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1415                 }
1416         } else {
1417                 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1418         }
1419
1420         /* Old ifenslave binaries are no longer supported.  These can
1421          * be identified with moderate accuracy by the state of the slave:
1422          * the current ifenslave will set the interface down prior to
1423          * enslaving it; the old ifenslave will not.
1424          */
1425         if (slave_dev->flags & IFF_UP) {
1426                 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1427                 slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1428                 return -EPERM;
1429         }
1430
1431         /* set bonding device ether type by slave - bonding netdevices are
1432          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1433          * there is a need to override some of the type dependent attribs/funcs.
1434          *
1435          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1436          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1437          */
1438         if (!bond_has_slaves(bond)) {
1439                 if (bond_dev->type != slave_dev->type) {
1440                         slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1441                                   bond_dev->type, slave_dev->type);
1442
1443                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1444                                                        bond_dev);
1445                         res = notifier_to_errno(res);
1446                         if (res) {
1447                                 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1448                                 return -EBUSY;
1449                         }
1450
1451                         /* Flush unicast and multicast addresses */
1452                         dev_uc_flush(bond_dev);
1453                         dev_mc_flush(bond_dev);
1454
1455                         if (slave_dev->type != ARPHRD_ETHER)
1456                                 bond_setup_by_slave(bond_dev, slave_dev);
1457                         else {
1458                                 ether_setup(bond_dev);
1459                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1460                         }
1461
1462                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1463                                                  bond_dev);
1464                 }
1465         } else if (bond_dev->type != slave_dev->type) {
1466                 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1467                 slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1468                           slave_dev->type, bond_dev->type);
1469                 return -EINVAL;
1470         }
1471
1472         if (slave_dev->type == ARPHRD_INFINIBAND &&
1473             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1474                 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1475                 slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1476                            slave_dev->type);
1477                 res = -EOPNOTSUPP;
1478                 goto err_undo_flags;
1479         }
1480
1481         if (!slave_ops->ndo_set_mac_address ||
1482             slave_dev->type == ARPHRD_INFINIBAND) {
1483                 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1484                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1485                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1486                         if (!bond_has_slaves(bond)) {
1487                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1488                                 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1489                         } else {
1490                                 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1491                                 slave_err(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1492                                 res = -EOPNOTSUPP;
1493                                 goto err_undo_flags;
1494                         }
1495                 }
1496         }
1497
1498         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1499
1500         /* If this is the first slave, then we need to set the master's hardware
1501          * address to be the same as the slave's.
1502          */
1503         if (!bond_has_slaves(bond) &&
1504             bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1505                 res = bond_set_dev_addr(bond->dev, slave_dev);
1506                 if (res)
1507                         goto err_undo_flags;
1508         }
1509
1510         new_slave = bond_alloc_slave(bond);
1511         if (!new_slave) {
1512                 res = -ENOMEM;
1513                 goto err_undo_flags;
1514         }
1515
1516         new_slave->bond = bond;
1517         new_slave->dev = slave_dev;
1518         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1519          * is set via sysfs or module option if desired.
1520          */
1521         new_slave->queue_id = 0;
1522
1523         /* Save slave's original mtu and then set it to match the bond */
1524         new_slave->original_mtu = slave_dev->mtu;
1525         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1526         if (res) {
1527                 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1528                 goto err_free;
1529         }
1530
1531         /* Save slave's original ("permanent") mac address for modes
1532          * that need it, and for restoring it upon release, and then
1533          * set it to the master's address
1534          */
1535         bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1536                           slave_dev->addr_len);
1537
1538         if (!bond->params.fail_over_mac ||
1539             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1540                 /* Set slave to master's mac address.  The application already
1541                  * set the master's mac address to that of the first slave
1542                  */
1543                 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1544                 ss.ss_family = slave_dev->type;
1545                 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1546                                           extack);
1547                 if (res) {
1548                         slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1549                         goto err_restore_mtu;
1550                 }
1551         }
1552
1553         /* set slave flag before open to prevent IPv6 addrconf */
1554         slave_dev->flags |= IFF_SLAVE;
1555
1556         /* open the slave since the application closed it */
1557         res = dev_open(slave_dev, extack);
1558         if (res) {
1559                 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1560                 goto err_restore_mac;
1561         }
1562
1563         slave_dev->priv_flags |= IFF_BONDING;
1564         /* initialize slave stats */
1565         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1566
1567         if (bond_is_lb(bond)) {
1568                 /* bond_alb_init_slave() must be called before all other stages since
1569                  * it might fail and we do not want to have to undo everything
1570                  */
1571                 res = bond_alb_init_slave(bond, new_slave);
1572                 if (res)
1573                         goto err_close;
1574         }
1575
1576         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1577         if (res) {
1578                 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1579                 goto err_close;
1580         }
1581
1582         prev_slave = bond_last_slave(bond);
1583
1584         new_slave->delay = 0;
1585         new_slave->link_failure_count = 0;
1586
1587         if (bond_update_speed_duplex(new_slave) &&
1588             bond_needs_speed_duplex(bond))
1589                 new_slave->link = BOND_LINK_DOWN;
1590
1591         new_slave->last_rx = jiffies -
1592                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1593         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1594                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1595
1596         if (bond->params.miimon && !bond->params.use_carrier) {
1597                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1598
1599                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1600                         /* miimon is set but a bonded network driver
1601                          * does not support ETHTOOL/MII and
1602                          * arp_interval is not set.  Note: if
1603                          * use_carrier is enabled, we will never go
1604                          * here (because netif_carrier is always
1605                          * supported); thus, we don't need to change
1606                          * the messages for netif_carrier.
1607                          */
1608                         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");
1609                 } else if (link_reporting == -1) {
1610                         /* unable get link status using mii/ethtool */
1611                         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");
1612                 }
1613         }
1614
1615         /* check for initial state */
1616         new_slave->link = BOND_LINK_NOCHANGE;
1617         if (bond->params.miimon) {
1618                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1619                         if (bond->params.updelay) {
1620                                 bond_set_slave_link_state(new_slave,
1621                                                           BOND_LINK_BACK,
1622                                                           BOND_SLAVE_NOTIFY_NOW);
1623                                 new_slave->delay = bond->params.updelay;
1624                         } else {
1625                                 bond_set_slave_link_state(new_slave,
1626                                                           BOND_LINK_UP,
1627                                                           BOND_SLAVE_NOTIFY_NOW);
1628                         }
1629                 } else {
1630                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1631                                                   BOND_SLAVE_NOTIFY_NOW);
1632                 }
1633         } else if (bond->params.arp_interval) {
1634                 bond_set_slave_link_state(new_slave,
1635                                           (netif_carrier_ok(slave_dev) ?
1636                                           BOND_LINK_UP : BOND_LINK_DOWN),
1637                                           BOND_SLAVE_NOTIFY_NOW);
1638         } else {
1639                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1640                                           BOND_SLAVE_NOTIFY_NOW);
1641         }
1642
1643         if (new_slave->link != BOND_LINK_DOWN)
1644                 new_slave->last_link_up = jiffies;
1645         slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1646                   new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1647                   (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1648
1649         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1650                 /* if there is a primary slave, remember it */
1651                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1652                         rcu_assign_pointer(bond->primary_slave, new_slave);
1653                         bond->force_primary = true;
1654                 }
1655         }
1656
1657         switch (BOND_MODE(bond)) {
1658         case BOND_MODE_ACTIVEBACKUP:
1659                 bond_set_slave_inactive_flags(new_slave,
1660                                               BOND_SLAVE_NOTIFY_NOW);
1661                 break;
1662         case BOND_MODE_8023AD:
1663                 /* in 802.3ad mode, the internal mechanism
1664                  * will activate the slaves in the selected
1665                  * aggregator
1666                  */
1667                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1668                 /* if this is the first slave */
1669                 if (!prev_slave) {
1670                         SLAVE_AD_INFO(new_slave)->id = 1;
1671                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1672                          * can be called only after the mac address of the bond is set
1673                          */
1674                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1675                 } else {
1676                         SLAVE_AD_INFO(new_slave)->id =
1677                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1678                 }
1679
1680                 bond_3ad_bind_slave(new_slave);
1681                 break;
1682         case BOND_MODE_TLB:
1683         case BOND_MODE_ALB:
1684                 bond_set_active_slave(new_slave);
1685                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1686                 break;
1687         default:
1688                 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1689
1690                 /* always active in trunk mode */
1691                 bond_set_active_slave(new_slave);
1692
1693                 /* In trunking mode there is little meaning to curr_active_slave
1694                  * anyway (it holds no special properties of the bond device),
1695                  * so we can change it without calling change_active_interface()
1696                  */
1697                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1698                     new_slave->link == BOND_LINK_UP)
1699                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1700
1701                 break;
1702         } /* switch(bond_mode) */
1703
1704 #ifdef CONFIG_NET_POLL_CONTROLLER
1705         if (bond->dev->npinfo) {
1706                 if (slave_enable_netpoll(new_slave)) {
1707                         slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1708                         res = -EBUSY;
1709                         goto err_detach;
1710                 }
1711         }
1712 #endif
1713
1714         if (!(bond_dev->features & NETIF_F_LRO))
1715                 dev_disable_lro(slave_dev);
1716
1717         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1718                                          new_slave);
1719         if (res) {
1720                 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1721                 goto err_detach;
1722         }
1723
1724         res = bond_master_upper_dev_link(bond, new_slave, extack);
1725         if (res) {
1726                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1727                 goto err_unregister;
1728         }
1729
1730         res = bond_sysfs_slave_add(new_slave);
1731         if (res) {
1732                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1733                 goto err_upper_unlink;
1734         }
1735
1736         bond->nest_level = dev_get_nest_level(bond_dev) + 1;
1737
1738         /* If the mode uses primary, then the following is handled by
1739          * bond_change_active_slave().
1740          */
1741         if (!bond_uses_primary(bond)) {
1742                 /* set promiscuity level to new slave */
1743                 if (bond_dev->flags & IFF_PROMISC) {
1744                         res = dev_set_promiscuity(slave_dev, 1);
1745                         if (res)
1746                                 goto err_sysfs_del;
1747                 }
1748
1749                 /* set allmulti level to new slave */
1750                 if (bond_dev->flags & IFF_ALLMULTI) {
1751                         res = dev_set_allmulti(slave_dev, 1);
1752                         if (res) {
1753                                 if (bond_dev->flags & IFF_PROMISC)
1754                                         dev_set_promiscuity(slave_dev, -1);
1755                                 goto err_sysfs_del;
1756                         }
1757                 }
1758
1759                 netif_addr_lock_bh(bond_dev);
1760                 dev_mc_sync_multiple(slave_dev, bond_dev);
1761                 dev_uc_sync_multiple(slave_dev, bond_dev);
1762                 netif_addr_unlock_bh(bond_dev);
1763
1764                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1765                         /* add lacpdu mc addr to mc list */
1766                         u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1767
1768                         dev_mc_add(slave_dev, lacpdu_multicast);
1769                 }
1770         }
1771
1772         bond->slave_cnt++;
1773         bond_compute_features(bond);
1774         bond_set_carrier(bond);
1775
1776         if (bond_uses_primary(bond)) {
1777                 block_netpoll_tx();
1778                 bond_select_active_slave(bond);
1779                 unblock_netpoll_tx();
1780         }
1781
1782         if (bond_mode_can_use_xmit_hash(bond))
1783                 bond_update_slave_arr(bond, NULL);
1784
1785
1786         slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
1787                    bond_is_active_slave(new_slave) ? "an active" : "a backup",
1788                    new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1789
1790         /* enslave is successful */
1791         bond_queue_slave_event(new_slave);
1792         return 0;
1793
1794 /* Undo stages on error */
1795 err_sysfs_del:
1796         bond_sysfs_slave_del(new_slave);
1797
1798 err_upper_unlink:
1799         bond_upper_dev_unlink(bond, new_slave);
1800
1801 err_unregister:
1802         netdev_rx_handler_unregister(slave_dev);
1803
1804 err_detach:
1805         vlan_vids_del_by_dev(slave_dev, bond_dev);
1806         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1807                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1808         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1809                 block_netpoll_tx();
1810                 bond_change_active_slave(bond, NULL);
1811                 bond_select_active_slave(bond);
1812                 unblock_netpoll_tx();
1813         }
1814         /* either primary_slave or curr_active_slave might've changed */
1815         synchronize_rcu();
1816         slave_disable_netpoll(new_slave);
1817
1818 err_close:
1819         slave_dev->priv_flags &= ~IFF_BONDING;
1820         dev_close(slave_dev);
1821
1822 err_restore_mac:
1823         slave_dev->flags &= ~IFF_SLAVE;
1824         if (!bond->params.fail_over_mac ||
1825             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1826                 /* XXX TODO - fom follow mode needs to change master's
1827                  * MAC if this slave's MAC is in use by the bond, or at
1828                  * least print a warning.
1829                  */
1830                 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
1831                                   new_slave->dev->addr_len);
1832                 ss.ss_family = slave_dev->type;
1833                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
1834         }
1835
1836 err_restore_mtu:
1837         dev_set_mtu(slave_dev, new_slave->original_mtu);
1838
1839 err_free:
1840         bond_free_slave(new_slave);
1841
1842 err_undo_flags:
1843         /* Enslave of first slave has failed and we need to fix master's mac */
1844         if (!bond_has_slaves(bond)) {
1845                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1846                                             slave_dev->dev_addr))
1847                         eth_hw_addr_random(bond_dev);
1848                 if (bond_dev->type != ARPHRD_ETHER) {
1849                         dev_close(bond_dev);
1850                         ether_setup(bond_dev);
1851                         bond_dev->flags |= IFF_MASTER;
1852                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1853                 }
1854         }
1855
1856         return res;
1857 }
1858
1859 /* Try to release the slave device <slave> from the bond device <master>
1860  * It is legal to access curr_active_slave without a lock because all the function
1861  * is RTNL-locked. If "all" is true it means that the function is being called
1862  * while destroying a bond interface and all slaves are being released.
1863  *
1864  * The rules for slave state should be:
1865  *   for Active/Backup:
1866  *     Active stays on all backups go down
1867  *   for Bonded connections:
1868  *     The first up interface should be left on and all others downed.
1869  */
1870 static int __bond_release_one(struct net_device *bond_dev,
1871                               struct net_device *slave_dev,
1872                               bool all, bool unregister)
1873 {
1874         struct bonding *bond = netdev_priv(bond_dev);
1875         struct slave *slave, *oldcurrent;
1876         struct sockaddr_storage ss;
1877         int old_flags = bond_dev->flags;
1878         netdev_features_t old_features = bond_dev->features;
1879
1880         /* slave is not a slave or master is not master of this slave */
1881         if (!(slave_dev->flags & IFF_SLAVE) ||
1882             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1883                 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
1884                 return -EINVAL;
1885         }
1886
1887         block_netpoll_tx();
1888
1889         slave = bond_get_slave_by_dev(bond, slave_dev);
1890         if (!slave) {
1891                 /* not a slave of this bond */
1892                 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
1893                 unblock_netpoll_tx();
1894                 return -EINVAL;
1895         }
1896
1897         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1898
1899         bond_sysfs_slave_del(slave);
1900
1901         /* recompute stats just before removing the slave */
1902         bond_get_stats(bond->dev, &bond->bond_stats);
1903
1904         bond_upper_dev_unlink(bond, slave);
1905         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1906          * for this slave anymore.
1907          */
1908         netdev_rx_handler_unregister(slave_dev);
1909
1910         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1911                 bond_3ad_unbind_slave(slave);
1912
1913         if (bond_mode_can_use_xmit_hash(bond))
1914                 bond_update_slave_arr(bond, slave);
1915
1916         slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
1917                     bond_is_active_slave(slave) ? "active" : "backup");
1918
1919         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1920
1921         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1922
1923         if (!all && (!bond->params.fail_over_mac ||
1924                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1925                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1926                     bond_has_slaves(bond))
1927                         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",
1928                                    slave->perm_hwaddr);
1929         }
1930
1931         if (rtnl_dereference(bond->primary_slave) == slave)
1932                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1933
1934         if (oldcurrent == slave)
1935                 bond_change_active_slave(bond, NULL);
1936
1937         if (bond_is_lb(bond)) {
1938                 /* Must be called only after the slave has been
1939                  * detached from the list and the curr_active_slave
1940                  * has been cleared (if our_slave == old_current),
1941                  * but before a new active slave is selected.
1942                  */
1943                 bond_alb_deinit_slave(bond, slave);
1944         }
1945
1946         if (all) {
1947                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1948         } else if (oldcurrent == slave) {
1949                 /* Note that we hold RTNL over this sequence, so there
1950                  * is no concern that another slave add/remove event
1951                  * will interfere.
1952                  */
1953                 bond_select_active_slave(bond);
1954         }
1955
1956         if (!bond_has_slaves(bond)) {
1957                 bond_set_carrier(bond);
1958                 eth_hw_addr_random(bond_dev);
1959                 bond->nest_level = SINGLE_DEPTH_NESTING;
1960         } else {
1961                 bond->nest_level = dev_get_nest_level(bond_dev) + 1;
1962         }
1963
1964         unblock_netpoll_tx();
1965         synchronize_rcu();
1966         bond->slave_cnt--;
1967
1968         if (!bond_has_slaves(bond)) {
1969                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1970                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1971         }
1972
1973         bond_compute_features(bond);
1974         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1975             (old_features & NETIF_F_VLAN_CHALLENGED))
1976                 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
1977
1978         vlan_vids_del_by_dev(slave_dev, bond_dev);
1979
1980         /* If the mode uses primary, then this case was handled above by
1981          * bond_change_active_slave(..., NULL)
1982          */
1983         if (!bond_uses_primary(bond)) {
1984                 /* unset promiscuity level from slave
1985                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1986                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1987                  * value of that flag before that change, as that was the value
1988                  * when this slave was attached, so we cache at the start of the
1989                  * function and use it here. Same goes for ALLMULTI below
1990                  */
1991                 if (old_flags & IFF_PROMISC)
1992                         dev_set_promiscuity(slave_dev, -1);
1993
1994                 /* unset allmulti level from slave */
1995                 if (old_flags & IFF_ALLMULTI)
1996                         dev_set_allmulti(slave_dev, -1);
1997
1998                 bond_hw_addr_flush(bond_dev, slave_dev);
1999         }
2000
2001         slave_disable_netpoll(slave);
2002
2003         /* close slave before restoring its mac address */
2004         dev_close(slave_dev);
2005
2006         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2007             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2008                 /* restore original ("permanent") mac address */
2009                 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2010                                   slave->dev->addr_len);
2011                 ss.ss_family = slave_dev->type;
2012                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2013         }
2014
2015         if (unregister)
2016                 __dev_set_mtu(slave_dev, slave->original_mtu);
2017         else
2018                 dev_set_mtu(slave_dev, slave->original_mtu);
2019
2020         slave_dev->priv_flags &= ~IFF_BONDING;
2021
2022         bond_free_slave(slave);
2023
2024         return 0;
2025 }
2026
2027 /* A wrapper used because of ndo_del_link */
2028 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2029 {
2030         return __bond_release_one(bond_dev, slave_dev, false, false);
2031 }
2032
2033 /* First release a slave and then destroy the bond if no more slaves are left.
2034  * Must be under rtnl_lock when this function is called.
2035  */
2036 static int bond_release_and_destroy(struct net_device *bond_dev,
2037                                     struct net_device *slave_dev)
2038 {
2039         struct bonding *bond = netdev_priv(bond_dev);
2040         int ret;
2041
2042         ret = __bond_release_one(bond_dev, slave_dev, false, true);
2043         if (ret == 0 && !bond_has_slaves(bond)) {
2044                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2045                 netdev_info(bond_dev, "Destroying bond\n");
2046                 bond_remove_proc_entry(bond);
2047                 unregister_netdevice(bond_dev);
2048         }
2049         return ret;
2050 }
2051
2052 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2053 {
2054         struct bonding *bond = netdev_priv(bond_dev);
2055         bond_fill_ifbond(bond, info);
2056 }
2057
2058 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2059 {
2060         struct bonding *bond = netdev_priv(bond_dev);
2061         struct list_head *iter;
2062         int i = 0, res = -ENODEV;
2063         struct slave *slave;
2064
2065         bond_for_each_slave(bond, slave, iter) {
2066                 if (i++ == (int)info->slave_id) {
2067                         res = 0;
2068                         bond_fill_ifslave(slave, info);
2069                         break;
2070                 }
2071         }
2072
2073         return res;
2074 }
2075
2076 /*-------------------------------- Monitoring -------------------------------*/
2077
2078 /* called with rcu_read_lock() */
2079 static int bond_miimon_inspect(struct bonding *bond)
2080 {
2081         int link_state, commit = 0;
2082         struct list_head *iter;
2083         struct slave *slave;
2084         bool ignore_updelay;
2085
2086         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2087
2088         bond_for_each_slave_rcu(bond, slave, iter) {
2089                 slave->new_link = BOND_LINK_NOCHANGE;
2090                 slave->link_new_state = slave->link;
2091
2092                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2093
2094                 switch (slave->link) {
2095                 case BOND_LINK_UP:
2096                         if (link_state)
2097                                 continue;
2098
2099                         bond_propose_link_state(slave, BOND_LINK_FAIL);
2100                         commit++;
2101                         slave->delay = bond->params.downdelay;
2102                         if (slave->delay) {
2103                                 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2104                                            (BOND_MODE(bond) ==
2105                                             BOND_MODE_ACTIVEBACKUP) ?
2106                                             (bond_is_active_slave(slave) ?
2107                                              "active " : "backup ") : "",
2108                                            bond->params.downdelay * bond->params.miimon);
2109                         }
2110                         /*FALLTHRU*/
2111                 case BOND_LINK_FAIL:
2112                         if (link_state) {
2113                                 /* recovered before downdelay expired */
2114                                 bond_propose_link_state(slave, BOND_LINK_UP);
2115                                 slave->last_link_up = jiffies;
2116                                 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2117                                            (bond->params.downdelay - slave->delay) *
2118                                            bond->params.miimon);
2119                                 commit++;
2120                                 continue;
2121                         }
2122
2123                         if (slave->delay <= 0) {
2124                                 slave->new_link = BOND_LINK_DOWN;
2125                                 commit++;
2126                                 continue;
2127                         }
2128
2129                         slave->delay--;
2130                         break;
2131
2132                 case BOND_LINK_DOWN:
2133                         if (!link_state)
2134                                 continue;
2135
2136                         bond_propose_link_state(slave, BOND_LINK_BACK);
2137                         commit++;
2138                         slave->delay = bond->params.updelay;
2139
2140                         if (slave->delay) {
2141                                 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2142                                            ignore_updelay ? 0 :
2143                                            bond->params.updelay *
2144                                            bond->params.miimon);
2145                         }
2146                         /*FALLTHRU*/
2147                 case BOND_LINK_BACK:
2148                         if (!link_state) {
2149                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2150                                 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2151                                            (bond->params.updelay - slave->delay) *
2152                                            bond->params.miimon);
2153                                 commit++;
2154                                 continue;
2155                         }
2156
2157                         if (ignore_updelay)
2158                                 slave->delay = 0;
2159
2160                         if (slave->delay <= 0) {
2161                                 slave->new_link = BOND_LINK_UP;
2162                                 commit++;
2163                                 ignore_updelay = false;
2164                                 continue;
2165                         }
2166
2167                         slave->delay--;
2168                         break;
2169                 }
2170         }
2171
2172         return commit;
2173 }
2174
2175 static void bond_miimon_link_change(struct bonding *bond,
2176                                     struct slave *slave,
2177                                     char link)
2178 {
2179         switch (BOND_MODE(bond)) {
2180         case BOND_MODE_8023AD:
2181                 bond_3ad_handle_link_change(slave, link);
2182                 break;
2183         case BOND_MODE_TLB:
2184         case BOND_MODE_ALB:
2185                 bond_alb_handle_link_change(bond, slave, link);
2186                 break;
2187         case BOND_MODE_XOR:
2188                 bond_update_slave_arr(bond, NULL);
2189                 break;
2190         }
2191 }
2192
2193 static void bond_miimon_commit(struct bonding *bond)
2194 {
2195         struct list_head *iter;
2196         struct slave *slave, *primary;
2197
2198         bond_for_each_slave(bond, slave, iter) {
2199                 switch (slave->new_link) {
2200                 case BOND_LINK_NOCHANGE:
2201                         /* For 802.3ad mode, check current slave speed and
2202                          * duplex again in case its port was disabled after
2203                          * invalid speed/duplex reporting but recovered before
2204                          * link monitoring could make a decision on the actual
2205                          * link status
2206                          */
2207                         if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2208                             slave->link == BOND_LINK_UP)
2209                                 bond_3ad_adapter_speed_duplex_changed(slave);
2210                         continue;
2211
2212                 case BOND_LINK_UP:
2213                         if (bond_update_speed_duplex(slave) &&
2214                             bond_needs_speed_duplex(bond)) {
2215                                 slave->link = BOND_LINK_DOWN;
2216                                 if (net_ratelimit())
2217                                         slave_warn(bond->dev, slave->dev,
2218                                                    "failed to get link speed/duplex\n");
2219                                 continue;
2220                         }
2221                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2222                                                   BOND_SLAVE_NOTIFY_NOW);
2223                         slave->last_link_up = jiffies;
2224
2225                         primary = rtnl_dereference(bond->primary_slave);
2226                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2227                                 /* prevent it from being the active one */
2228                                 bond_set_backup_slave(slave);
2229                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2230                                 /* make it immediately active */
2231                                 bond_set_active_slave(slave);
2232                         } else if (slave != primary) {
2233                                 /* prevent it from being the active one */
2234                                 bond_set_backup_slave(slave);
2235                         }
2236
2237                         slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2238                                    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2239                                    slave->duplex ? "full" : "half");
2240
2241                         bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2242
2243                         if (!bond->curr_active_slave || slave == primary)
2244                                 goto do_failover;
2245
2246                         continue;
2247
2248                 case BOND_LINK_DOWN:
2249                         if (slave->link_failure_count < UINT_MAX)
2250                                 slave->link_failure_count++;
2251
2252                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2253                                                   BOND_SLAVE_NOTIFY_NOW);
2254
2255                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2256                             BOND_MODE(bond) == BOND_MODE_8023AD)
2257                                 bond_set_slave_inactive_flags(slave,
2258                                                               BOND_SLAVE_NOTIFY_NOW);
2259
2260                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2261
2262                         bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2263
2264                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2265                                 goto do_failover;
2266
2267                         continue;
2268
2269                 default:
2270                         slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2271                                   slave->new_link);
2272                         slave->new_link = BOND_LINK_NOCHANGE;
2273
2274                         continue;
2275                 }
2276
2277 do_failover:
2278                 block_netpoll_tx();
2279                 bond_select_active_slave(bond);
2280                 unblock_netpoll_tx();
2281         }
2282
2283         bond_set_carrier(bond);
2284 }
2285
2286 /* bond_mii_monitor
2287  *
2288  * Really a wrapper that splits the mii monitor into two phases: an
2289  * inspection, then (if inspection indicates something needs to be done)
2290  * an acquisition of appropriate locks followed by a commit phase to
2291  * implement whatever link state changes are indicated.
2292  */
2293 static void bond_mii_monitor(struct work_struct *work)
2294 {
2295         struct bonding *bond = container_of(work, struct bonding,
2296                                             mii_work.work);
2297         bool should_notify_peers = false;
2298         bool commit;
2299         unsigned long delay;
2300         struct slave *slave;
2301         struct list_head *iter;
2302
2303         delay = msecs_to_jiffies(bond->params.miimon);
2304
2305         if (!bond_has_slaves(bond))
2306                 goto re_arm;
2307
2308         rcu_read_lock();
2309         should_notify_peers = bond_should_notify_peers(bond);
2310         commit = !!bond_miimon_inspect(bond);
2311         if (bond->send_peer_notif) {
2312                 rcu_read_unlock();
2313                 if (rtnl_trylock()) {
2314                         bond->send_peer_notif--;
2315                         rtnl_unlock();
2316                 }
2317         } else {
2318                 rcu_read_unlock();
2319         }
2320
2321         if (commit) {
2322                 /* Race avoidance with bond_close cancel of workqueue */
2323                 if (!rtnl_trylock()) {
2324                         delay = 1;
2325                         should_notify_peers = false;
2326                         goto re_arm;
2327                 }
2328
2329                 bond_for_each_slave(bond, slave, iter) {
2330                         bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2331                 }
2332                 bond_miimon_commit(bond);
2333
2334                 rtnl_unlock();  /* might sleep, hold no other locks */
2335         }
2336
2337 re_arm:
2338         if (bond->params.miimon)
2339                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2340
2341         if (should_notify_peers) {
2342                 if (!rtnl_trylock())
2343                         return;
2344                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2345                 rtnl_unlock();
2346         }
2347 }
2348
2349 static int bond_upper_dev_walk(struct net_device *upper, void *data)
2350 {
2351         __be32 ip = *((__be32 *)data);
2352
2353         return ip == bond_confirm_addr(upper, 0, ip);
2354 }
2355
2356 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2357 {
2358         bool ret = false;
2359
2360         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2361                 return true;
2362
2363         rcu_read_lock();
2364         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2365                 ret = true;
2366         rcu_read_unlock();
2367
2368         return ret;
2369 }
2370
2371 /* We go to the (large) trouble of VLAN tagging ARP frames because
2372  * switches in VLAN mode (especially if ports are configured as
2373  * "native" to a VLAN) might not pass non-tagged frames.
2374  */
2375 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2376                           __be32 src_ip, struct bond_vlan_tag *tags)
2377 {
2378         struct sk_buff *skb;
2379         struct bond_vlan_tag *outer_tag = tags;
2380         struct net_device *slave_dev = slave->dev;
2381         struct net_device *bond_dev = slave->bond->dev;
2382
2383         slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2384                   arp_op, &dest_ip, &src_ip);
2385
2386         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2387                          NULL, slave_dev->dev_addr, NULL);
2388
2389         if (!skb) {
2390                 net_err_ratelimited("ARP packet allocation failed\n");
2391                 return;
2392         }
2393
2394         if (!tags || tags->vlan_proto == VLAN_N_VID)
2395                 goto xmit;
2396
2397         tags++;
2398
2399         /* Go through all the tags backwards and add them to the packet */
2400         while (tags->vlan_proto != VLAN_N_VID) {
2401                 if (!tags->vlan_id) {
2402                         tags++;
2403                         continue;
2404                 }
2405
2406                 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2407                           ntohs(outer_tag->vlan_proto), tags->vlan_id);
2408                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2409                                                 tags->vlan_id);
2410                 if (!skb) {
2411                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2412                         return;
2413                 }
2414
2415                 tags++;
2416         }
2417         /* Set the outer tag */
2418         if (outer_tag->vlan_id) {
2419                 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2420                           ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2421                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2422                                        outer_tag->vlan_id);
2423         }
2424
2425 xmit:
2426         arp_xmit(skb);
2427 }
2428
2429 /* Validate the device path between the @start_dev and the @end_dev.
2430  * The path is valid if the @end_dev is reachable through device
2431  * stacking.
2432  * When the path is validated, collect any vlan information in the
2433  * path.
2434  */
2435 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2436                                               struct net_device *end_dev,
2437                                               int level)
2438 {
2439         struct bond_vlan_tag *tags;
2440         struct net_device *upper;
2441         struct list_head  *iter;
2442
2443         if (start_dev == end_dev) {
2444                 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2445                 if (!tags)
2446                         return ERR_PTR(-ENOMEM);
2447                 tags[level].vlan_proto = VLAN_N_VID;
2448                 return tags;
2449         }
2450
2451         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2452                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2453                 if (IS_ERR_OR_NULL(tags)) {
2454                         if (IS_ERR(tags))
2455                                 return tags;
2456                         continue;
2457                 }
2458                 if (is_vlan_dev(upper)) {
2459                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2460                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2461                 }
2462
2463                 return tags;
2464         }
2465
2466         return NULL;
2467 }
2468
2469 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2470 {
2471         struct rtable *rt;
2472         struct bond_vlan_tag *tags;
2473         __be32 *targets = bond->params.arp_targets, addr;
2474         int i;
2475
2476         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2477                 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2478                           __func__, &targets[i]);
2479                 tags = NULL;
2480
2481                 /* Find out through which dev should the packet go */
2482                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2483                                      RTO_ONLINK, 0);
2484                 if (IS_ERR(rt)) {
2485                         /* there's no route to target - try to send arp
2486                          * probe to generate any traffic (arp_validate=0)
2487                          */
2488                         if (bond->params.arp_validate)
2489                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2490                                                      bond->dev->name,
2491                                                      &targets[i]);
2492                         bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2493                                       0, tags);
2494                         continue;
2495                 }
2496
2497                 /* bond device itself */
2498                 if (rt->dst.dev == bond->dev)
2499                         goto found;
2500
2501                 rcu_read_lock();
2502                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2503                 rcu_read_unlock();
2504
2505                 if (!IS_ERR_OR_NULL(tags))
2506                         goto found;
2507
2508                 /* Not our device - skip */
2509                 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2510                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2511
2512                 ip_rt_put(rt);
2513                 continue;
2514
2515 found:
2516                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2517                 ip_rt_put(rt);
2518                 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2519                 kfree(tags);
2520         }
2521 }
2522
2523 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2524 {
2525         int i;
2526
2527         if (!sip || !bond_has_this_ip(bond, tip)) {
2528                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2529                            __func__, &sip, &tip);
2530                 return;
2531         }
2532
2533         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2534         if (i == -1) {
2535                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2536                            __func__, &sip);
2537                 return;
2538         }
2539         slave->last_rx = jiffies;
2540         slave->target_last_arp_rx[i] = jiffies;
2541 }
2542
2543 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2544                  struct slave *slave)
2545 {
2546         struct arphdr *arp = (struct arphdr *)skb->data;
2547         struct slave *curr_active_slave, *curr_arp_slave;
2548         unsigned char *arp_ptr;
2549         __be32 sip, tip;
2550         int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2551         unsigned int alen;
2552
2553         if (!slave_do_arp_validate(bond, slave)) {
2554                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2555                     !slave_do_arp_validate_only(bond))
2556                         slave->last_rx = jiffies;
2557                 return RX_HANDLER_ANOTHER;
2558         } else if (!is_arp) {
2559                 return RX_HANDLER_ANOTHER;
2560         }
2561
2562         alen = arp_hdr_len(bond->dev);
2563
2564         slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2565                    __func__, skb->dev->name);
2566
2567         if (alen > skb_headlen(skb)) {
2568                 arp = kmalloc(alen, GFP_ATOMIC);
2569                 if (!arp)
2570                         goto out_unlock;
2571                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2572                         goto out_unlock;
2573         }
2574
2575         if (arp->ar_hln != bond->dev->addr_len ||
2576             skb->pkt_type == PACKET_OTHERHOST ||
2577             skb->pkt_type == PACKET_LOOPBACK ||
2578             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2579             arp->ar_pro != htons(ETH_P_IP) ||
2580             arp->ar_pln != 4)
2581                 goto out_unlock;
2582
2583         arp_ptr = (unsigned char *)(arp + 1);
2584         arp_ptr += bond->dev->addr_len;
2585         memcpy(&sip, arp_ptr, 4);
2586         arp_ptr += 4 + bond->dev->addr_len;
2587         memcpy(&tip, arp_ptr, 4);
2588
2589         slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2590                   __func__, slave->dev->name, bond_slave_state(slave),
2591                   bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2592                   &sip, &tip);
2593
2594         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2595         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2596
2597         /* We 'trust' the received ARP enough to validate it if:
2598          *
2599          * (a) the slave receiving the ARP is active (which includes the
2600          * current ARP slave, if any), or
2601          *
2602          * (b) the receiving slave isn't active, but there is a currently
2603          * active slave and it received valid arp reply(s) after it became
2604          * the currently active slave, or
2605          *
2606          * (c) there is an ARP slave that sent an ARP during the prior ARP
2607          * interval, and we receive an ARP reply on any slave.  We accept
2608          * these because switch FDB update delays may deliver the ARP
2609          * reply to a slave other than the sender of the ARP request.
2610          *
2611          * Note: for (b), backup slaves are receiving the broadcast ARP
2612          * request, not a reply.  This request passes from the sending
2613          * slave through the L2 switch(es) to the receiving slave.  Since
2614          * this is checking the request, sip/tip are swapped for
2615          * validation.
2616          *
2617          * This is done to avoid endless looping when we can't reach the
2618          * arp_ip_target and fool ourselves with our own arp requests.
2619          */
2620         if (bond_is_active_slave(slave))
2621                 bond_validate_arp(bond, slave, sip, tip);
2622         else if (curr_active_slave &&
2623                  time_after(slave_last_rx(bond, curr_active_slave),
2624                             curr_active_slave->last_link_up))
2625                 bond_validate_arp(bond, slave, tip, sip);
2626         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2627                  bond_time_in_interval(bond,
2628                                        dev_trans_start(curr_arp_slave->dev), 1))
2629                 bond_validate_arp(bond, slave, sip, tip);
2630
2631 out_unlock:
2632         if (arp != (struct arphdr *)skb->data)
2633                 kfree(arp);
2634         return RX_HANDLER_ANOTHER;
2635 }
2636
2637 /* function to verify if we're in the arp_interval timeslice, returns true if
2638  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2639  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2640  */
2641 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2642                                   int mod)
2643 {
2644         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2645
2646         return time_in_range(jiffies,
2647                              last_act - delta_in_ticks,
2648                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2649 }
2650
2651 /* This function is called regularly to monitor each slave's link
2652  * ensuring that traffic is being sent and received when arp monitoring
2653  * is used in load-balancing mode. if the adapter has been dormant, then an
2654  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2655  * arp monitoring in active backup mode.
2656  */
2657 static void bond_loadbalance_arp_mon(struct bonding *bond)
2658 {
2659         struct slave *slave, *oldcurrent;
2660         struct list_head *iter;
2661         int do_failover = 0, slave_state_changed = 0;
2662
2663         if (!bond_has_slaves(bond))
2664                 goto re_arm;
2665
2666         rcu_read_lock();
2667
2668         oldcurrent = rcu_dereference(bond->curr_active_slave);
2669         /* see if any of the previous devices are up now (i.e. they have
2670          * xmt and rcv traffic). the curr_active_slave does not come into
2671          * the picture unless it is null. also, slave->last_link_up is not
2672          * needed here because we send an arp on each slave and give a slave
2673          * as long as it needs to get the tx/rx within the delta.
2674          * TODO: what about up/down delay in arp mode? it wasn't here before
2675          *       so it can wait
2676          */
2677         bond_for_each_slave_rcu(bond, slave, iter) {
2678                 unsigned long trans_start = dev_trans_start(slave->dev);
2679
2680                 slave->new_link = BOND_LINK_NOCHANGE;
2681
2682                 if (slave->link != BOND_LINK_UP) {
2683                         if (bond_time_in_interval(bond, trans_start, 1) &&
2684                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2685
2686                                 slave->new_link = BOND_LINK_UP;
2687                                 slave_state_changed = 1;
2688
2689                                 /* primary_slave has no meaning in round-robin
2690                                  * mode. the window of a slave being up and
2691                                  * curr_active_slave being null after enslaving
2692                                  * is closed.
2693                                  */
2694                                 if (!oldcurrent) {
2695                                         slave_info(bond->dev, slave->dev, "link status definitely up\n");
2696                                         do_failover = 1;
2697                                 } else {
2698                                         slave_info(bond->dev, slave->dev, "interface is now up\n");
2699                                 }
2700                         }
2701                 } else {
2702                         /* slave->link == BOND_LINK_UP */
2703
2704                         /* not all switches will respond to an arp request
2705                          * when the source ip is 0, so don't take the link down
2706                          * if we don't know our ip yet
2707                          */
2708                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2709                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2710
2711                                 slave->new_link = BOND_LINK_DOWN;
2712                                 slave_state_changed = 1;
2713
2714                                 if (slave->link_failure_count < UINT_MAX)
2715                                         slave->link_failure_count++;
2716
2717                                 slave_info(bond->dev, slave->dev, "interface is now down\n");
2718
2719                                 if (slave == oldcurrent)
2720                                         do_failover = 1;
2721                         }
2722                 }
2723
2724                 /* note: if switch is in round-robin mode, all links
2725                  * must tx arp to ensure all links rx an arp - otherwise
2726                  * links may oscillate or not come up at all; if switch is
2727                  * in something like xor mode, there is nothing we can
2728                  * do - all replies will be rx'ed on same link causing slaves
2729                  * to be unstable during low/no traffic periods
2730                  */
2731                 if (bond_slave_is_up(slave))
2732                         bond_arp_send_all(bond, slave);
2733         }
2734
2735         rcu_read_unlock();
2736
2737         if (do_failover || slave_state_changed) {
2738                 if (!rtnl_trylock())
2739                         goto re_arm;
2740
2741                 bond_for_each_slave(bond, slave, iter) {
2742                         if (slave->new_link != BOND_LINK_NOCHANGE)
2743                                 slave->link = slave->new_link;
2744                 }
2745
2746                 if (slave_state_changed) {
2747                         bond_slave_state_change(bond);
2748                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2749                                 bond_update_slave_arr(bond, NULL);
2750                 }
2751                 if (do_failover) {
2752                         block_netpoll_tx();
2753                         bond_select_active_slave(bond);
2754                         unblock_netpoll_tx();
2755                 }
2756                 rtnl_unlock();
2757         }
2758
2759 re_arm:
2760         if (bond->params.arp_interval)
2761                 queue_delayed_work(bond->wq, &bond->arp_work,
2762                                    msecs_to_jiffies(bond->params.arp_interval));
2763 }
2764
2765 /* Called to inspect slaves for active-backup mode ARP monitor link state
2766  * changes.  Sets new_link in slaves to specify what action should take
2767  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2768  * to link states must be committed.
2769  *
2770  * Called with rcu_read_lock held.
2771  */
2772 static int bond_ab_arp_inspect(struct bonding *bond)
2773 {
2774         unsigned long trans_start, last_rx;
2775         struct list_head *iter;
2776         struct slave *slave;
2777         int commit = 0;
2778
2779         bond_for_each_slave_rcu(bond, slave, iter) {
2780                 slave->new_link = BOND_LINK_NOCHANGE;
2781                 last_rx = slave_last_rx(bond, slave);
2782
2783                 if (slave->link != BOND_LINK_UP) {
2784                         if (bond_time_in_interval(bond, last_rx, 1)) {
2785                                 slave->new_link = BOND_LINK_UP;
2786                                 commit++;
2787                         }
2788                         continue;
2789                 }
2790
2791                 /* Give slaves 2*delta after being enslaved or made
2792                  * active.  This avoids bouncing, as the last receive
2793                  * times need a full ARP monitor cycle to be updated.
2794                  */
2795                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2796                         continue;
2797
2798                 /* Backup slave is down if:
2799                  * - No current_arp_slave AND
2800                  * - more than 3*delta since last receive AND
2801                  * - the bond has an IP address
2802                  *
2803                  * Note: a non-null current_arp_slave indicates
2804                  * the curr_active_slave went down and we are
2805                  * searching for a new one; under this condition
2806                  * we only take the curr_active_slave down - this
2807                  * gives each slave a chance to tx/rx traffic
2808                  * before being taken out
2809                  */
2810                 if (!bond_is_active_slave(slave) &&
2811                     !rcu_access_pointer(bond->current_arp_slave) &&
2812                     !bond_time_in_interval(bond, last_rx, 3)) {
2813                         slave->new_link = BOND_LINK_DOWN;
2814                         commit++;
2815                 }
2816
2817                 /* Active slave is down if:
2818                  * - more than 2*delta since transmitting OR
2819                  * - (more than 2*delta since receive AND
2820                  *    the bond has an IP address)
2821                  */
2822                 trans_start = dev_trans_start(slave->dev);
2823                 if (bond_is_active_slave(slave) &&
2824                     (!bond_time_in_interval(bond, trans_start, 2) ||
2825                      !bond_time_in_interval(bond, last_rx, 2))) {
2826                         slave->new_link = BOND_LINK_DOWN;
2827                         commit++;
2828                 }
2829         }
2830
2831         return commit;
2832 }
2833
2834 /* Called to commit link state changes noted by inspection step of
2835  * active-backup mode ARP monitor.
2836  *
2837  * Called with RTNL hold.
2838  */
2839 static void bond_ab_arp_commit(struct bonding *bond)
2840 {
2841         unsigned long trans_start;
2842         struct list_head *iter;
2843         struct slave *slave;
2844
2845         bond_for_each_slave(bond, slave, iter) {
2846                 switch (slave->new_link) {
2847                 case BOND_LINK_NOCHANGE:
2848                         continue;
2849
2850                 case BOND_LINK_UP:
2851                         trans_start = dev_trans_start(slave->dev);
2852                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2853                             (!rtnl_dereference(bond->curr_active_slave) &&
2854                              bond_time_in_interval(bond, trans_start, 1))) {
2855                                 struct slave *current_arp_slave;
2856
2857                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2858                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
2859                                                           BOND_SLAVE_NOTIFY_NOW);
2860                                 if (current_arp_slave) {
2861                                         bond_set_slave_inactive_flags(
2862                                                 current_arp_slave,
2863                                                 BOND_SLAVE_NOTIFY_NOW);
2864                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2865                                 }
2866
2867                                 slave_info(bond->dev, slave->dev, "link status definitely up\n");
2868
2869                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2870                                     slave == rtnl_dereference(bond->primary_slave))
2871                                         goto do_failover;
2872
2873                         }
2874
2875                         continue;
2876
2877                 case BOND_LINK_DOWN:
2878                         if (slave->link_failure_count < UINT_MAX)
2879                                 slave->link_failure_count++;
2880
2881                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2882                                                   BOND_SLAVE_NOTIFY_NOW);
2883                         bond_set_slave_inactive_flags(slave,
2884                                                       BOND_SLAVE_NOTIFY_NOW);
2885
2886                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2887
2888                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2889                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2890                                 goto do_failover;
2891                         }
2892
2893                         continue;
2894
2895                 default:
2896                         slave_err(bond->dev, slave->dev, "impossible: new_link %d on slave\n",
2897                                   slave->new_link);
2898                         continue;
2899                 }
2900
2901 do_failover:
2902                 block_netpoll_tx();
2903                 bond_select_active_slave(bond);
2904                 unblock_netpoll_tx();
2905         }
2906
2907         bond_set_carrier(bond);
2908 }
2909
2910 /* Send ARP probes for active-backup mode ARP monitor.
2911  *
2912  * Called with rcu_read_lock held.
2913  */
2914 static bool bond_ab_arp_probe(struct bonding *bond)
2915 {
2916         struct slave *slave, *before = NULL, *new_slave = NULL,
2917                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2918                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2919         struct list_head *iter;
2920         bool found = false;
2921         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2922
2923         if (curr_arp_slave && curr_active_slave)
2924                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2925                             curr_arp_slave->dev->name,
2926                             curr_active_slave->dev->name);
2927
2928         if (curr_active_slave) {
2929                 bond_arp_send_all(bond, curr_active_slave);
2930                 return should_notify_rtnl;
2931         }
2932
2933         /* if we don't have a curr_active_slave, search for the next available
2934          * backup slave from the current_arp_slave and make it the candidate
2935          * for becoming the curr_active_slave
2936          */
2937
2938         if (!curr_arp_slave) {
2939                 curr_arp_slave = bond_first_slave_rcu(bond);
2940                 if (!curr_arp_slave)
2941                         return should_notify_rtnl;
2942         }
2943
2944         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2945
2946         bond_for_each_slave_rcu(bond, slave, iter) {
2947                 if (!found && !before && bond_slave_is_up(slave))
2948                         before = slave;
2949
2950                 if (found && !new_slave && bond_slave_is_up(slave))
2951                         new_slave = slave;
2952                 /* if the link state is up at this point, we
2953                  * mark it down - this can happen if we have
2954                  * simultaneous link failures and
2955                  * reselect_active_interface doesn't make this
2956                  * one the current slave so it is still marked
2957                  * up when it is actually down
2958                  */
2959                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2960                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2961                                                   BOND_SLAVE_NOTIFY_LATER);
2962                         if (slave->link_failure_count < UINT_MAX)
2963                                 slave->link_failure_count++;
2964
2965                         bond_set_slave_inactive_flags(slave,
2966                                                       BOND_SLAVE_NOTIFY_LATER);
2967
2968                         slave_info(bond->dev, slave->dev, "backup interface is now down\n");
2969                 }
2970                 if (slave == curr_arp_slave)
2971                         found = true;
2972         }
2973
2974         if (!new_slave && before)
2975                 new_slave = before;
2976
2977         if (!new_slave)
2978                 goto check_state;
2979
2980         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2981                                   BOND_SLAVE_NOTIFY_LATER);
2982         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2983         bond_arp_send_all(bond, new_slave);
2984         new_slave->last_link_up = jiffies;
2985         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2986
2987 check_state:
2988         bond_for_each_slave_rcu(bond, slave, iter) {
2989                 if (slave->should_notify || slave->should_notify_link) {
2990                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2991                         break;
2992                 }
2993         }
2994         return should_notify_rtnl;
2995 }
2996
2997 static void bond_activebackup_arp_mon(struct bonding *bond)
2998 {
2999         bool should_notify_peers = false;
3000         bool should_notify_rtnl = false;
3001         int delta_in_ticks;
3002
3003         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3004
3005         if (!bond_has_slaves(bond))
3006                 goto re_arm;
3007
3008         rcu_read_lock();
3009
3010         should_notify_peers = bond_should_notify_peers(bond);
3011
3012         if (bond_ab_arp_inspect(bond)) {
3013                 rcu_read_unlock();
3014
3015                 /* Race avoidance with bond_close flush of workqueue */
3016                 if (!rtnl_trylock()) {
3017                         delta_in_ticks = 1;
3018                         should_notify_peers = false;
3019                         goto re_arm;
3020                 }
3021
3022                 bond_ab_arp_commit(bond);
3023
3024                 rtnl_unlock();
3025                 rcu_read_lock();
3026         }
3027
3028         should_notify_rtnl = bond_ab_arp_probe(bond);
3029         rcu_read_unlock();
3030
3031 re_arm:
3032         if (bond->params.arp_interval)
3033                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3034
3035         if (should_notify_peers || should_notify_rtnl) {
3036                 if (!rtnl_trylock())
3037                         return;
3038
3039                 if (should_notify_peers)
3040                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3041                                                  bond->dev);
3042                 if (should_notify_rtnl) {
3043                         bond_slave_state_notify(bond);
3044                         bond_slave_link_notify(bond);
3045                 }
3046
3047                 rtnl_unlock();
3048         }
3049 }
3050
3051 static void bond_arp_monitor(struct work_struct *work)
3052 {
3053         struct bonding *bond = container_of(work, struct bonding,
3054                                             arp_work.work);
3055
3056         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3057                 bond_activebackup_arp_mon(bond);
3058         else
3059                 bond_loadbalance_arp_mon(bond);
3060 }
3061
3062 /*-------------------------- netdev event handling --------------------------*/
3063
3064 /* Change device name */
3065 static int bond_event_changename(struct bonding *bond)
3066 {
3067         bond_remove_proc_entry(bond);
3068         bond_create_proc_entry(bond);
3069
3070         bond_debug_reregister(bond);
3071
3072         return NOTIFY_DONE;
3073 }
3074
3075 static int bond_master_netdev_event(unsigned long event,
3076                                     struct net_device *bond_dev)
3077 {
3078         struct bonding *event_bond = netdev_priv(bond_dev);
3079
3080         netdev_dbg(bond_dev, "%s called\n", __func__);
3081
3082         switch (event) {
3083         case NETDEV_CHANGENAME:
3084                 return bond_event_changename(event_bond);
3085         case NETDEV_UNREGISTER:
3086                 bond_remove_proc_entry(event_bond);
3087                 break;
3088         case NETDEV_REGISTER:
3089                 bond_create_proc_entry(event_bond);
3090                 break;
3091         default:
3092                 break;
3093         }
3094
3095         return NOTIFY_DONE;
3096 }
3097
3098 static int bond_slave_netdev_event(unsigned long event,
3099                                    struct net_device *slave_dev)
3100 {
3101         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3102         struct bonding *bond;
3103         struct net_device *bond_dev;
3104
3105         /* A netdev event can be generated while enslaving a device
3106          * before netdev_rx_handler_register is called in which case
3107          * slave will be NULL
3108          */
3109         if (!slave) {
3110                 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3111                 return NOTIFY_DONE;
3112         }
3113
3114         bond_dev = slave->bond->dev;
3115         bond = slave->bond;
3116         primary = rtnl_dereference(bond->primary_slave);
3117
3118         slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3119
3120         switch (event) {
3121         case NETDEV_UNREGISTER:
3122                 if (bond_dev->type != ARPHRD_ETHER)
3123                         bond_release_and_destroy(bond_dev, slave_dev);
3124                 else
3125                         __bond_release_one(bond_dev, slave_dev, false, true);
3126                 break;
3127         case NETDEV_UP:
3128         case NETDEV_CHANGE:
3129                 /* For 802.3ad mode only:
3130                  * Getting invalid Speed/Duplex values here will put slave
3131                  * in weird state. Mark it as link-fail if the link was
3132                  * previously up or link-down if it hasn't yet come up, and
3133                  * let link-monitoring (miimon) set it right when correct
3134                  * speeds/duplex are available.
3135                  */
3136                 if (bond_update_speed_duplex(slave) &&
3137                     BOND_MODE(bond) == BOND_MODE_8023AD) {
3138                         if (slave->last_link_up)
3139                                 slave->link = BOND_LINK_FAIL;
3140                         else
3141                                 slave->link = BOND_LINK_DOWN;
3142                 }
3143
3144                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3145                         bond_3ad_adapter_speed_duplex_changed(slave);
3146                 /* Fallthrough */
3147         case NETDEV_DOWN:
3148                 /* Refresh slave-array if applicable!
3149                  * If the setup does not use miimon or arpmon (mode-specific!),
3150                  * then these events will not cause the slave-array to be
3151                  * refreshed. This will cause xmit to use a slave that is not
3152                  * usable. Avoid such situation by refeshing the array at these
3153                  * events. If these (miimon/arpmon) parameters are configured
3154                  * then array gets refreshed twice and that should be fine!
3155                  */
3156                 if (bond_mode_can_use_xmit_hash(bond))
3157                         bond_update_slave_arr(bond, NULL);
3158                 break;
3159         case NETDEV_CHANGEMTU:
3160                 /* TODO: Should slaves be allowed to
3161                  * independently alter their MTU?  For
3162                  * an active-backup bond, slaves need
3163                  * not be the same type of device, so
3164                  * MTUs may vary.  For other modes,
3165                  * slaves arguably should have the
3166                  * same MTUs. To do this, we'd need to
3167                  * take over the slave's change_mtu
3168                  * function for the duration of their
3169                  * servitude.
3170                  */
3171                 break;
3172         case NETDEV_CHANGENAME:
3173                 /* we don't care if we don't have primary set */
3174                 if (!bond_uses_primary(bond) ||
3175                     !bond->params.primary[0])
3176                         break;
3177
3178                 if (slave == primary) {
3179                         /* slave's name changed - he's no longer primary */
3180                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3181                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3182                         /* we have a new primary slave */
3183                         rcu_assign_pointer(bond->primary_slave, slave);
3184                 } else { /* we didn't change primary - exit */
3185                         break;
3186                 }
3187
3188                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3189                             primary ? slave_dev->name : "none");
3190
3191                 block_netpoll_tx();
3192                 bond_select_active_slave(bond);
3193                 unblock_netpoll_tx();
3194                 break;
3195         case NETDEV_FEAT_CHANGE:
3196                 bond_compute_features(bond);
3197                 break;
3198         case NETDEV_RESEND_IGMP:
3199                 /* Propagate to master device */
3200                 call_netdevice_notifiers(event, slave->bond->dev);
3201                 break;
3202         default:
3203                 break;
3204         }
3205
3206         return NOTIFY_DONE;
3207 }
3208
3209 /* bond_netdev_event: handle netdev notifier chain events.
3210  *
3211  * This function receives events for the netdev chain.  The caller (an
3212  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3213  * locks for us to safely manipulate the slave devices (RTNL lock,
3214  * dev_probe_lock).
3215  */
3216 static int bond_netdev_event(struct notifier_block *this,
3217                              unsigned long event, void *ptr)
3218 {
3219         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3220
3221         netdev_dbg(event_dev, "%s received %s\n",
3222                    __func__, netdev_cmd_to_name(event));
3223
3224         if (!(event_dev->priv_flags & IFF_BONDING))
3225                 return NOTIFY_DONE;
3226
3227         if (event_dev->flags & IFF_MASTER) {
3228                 int ret;
3229
3230                 ret = bond_master_netdev_event(event, event_dev);
3231                 if (ret != NOTIFY_DONE)
3232                         return ret;
3233         }
3234
3235         if (event_dev->flags & IFF_SLAVE)
3236                 return bond_slave_netdev_event(event, event_dev);
3237
3238         return NOTIFY_DONE;
3239 }
3240
3241 static struct notifier_block bond_netdev_notifier = {
3242         .notifier_call = bond_netdev_event,
3243 };
3244
3245 /*---------------------------- Hashing Policies -----------------------------*/
3246
3247 /* L2 hash helper */
3248 static inline u32 bond_eth_hash(struct sk_buff *skb)
3249 {
3250         struct ethhdr *ep, hdr_tmp;
3251
3252         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3253         if (ep)
3254                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3255         return 0;
3256 }
3257
3258 /* Extract the appropriate headers based on bond's xmit policy */
3259 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3260                               struct flow_keys *fk)
3261 {
3262         const struct ipv6hdr *iph6;
3263         const struct iphdr *iph;
3264         int noff, proto = -1;
3265
3266         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3267                 return skb_flow_dissect_flow_keys(skb, fk, 0);
3268
3269         fk->ports.ports = 0;
3270         noff = skb_network_offset(skb);
3271         if (skb->protocol == htons(ETH_P_IP)) {
3272                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3273                         return false;
3274                 iph = ip_hdr(skb);
3275                 iph_to_flow_copy_v4addrs(fk, iph);
3276                 noff += iph->ihl << 2;
3277                 if (!ip_is_fragment(iph))
3278                         proto = iph->protocol;
3279         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3280                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3281                         return false;
3282                 iph6 = ipv6_hdr(skb);
3283                 iph_to_flow_copy_v6addrs(fk, iph6);
3284                 noff += sizeof(*iph6);
3285                 proto = iph6->nexthdr;
3286         } else {
3287                 return false;
3288         }
3289         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3290                 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3291
3292         return true;
3293 }
3294
3295 /**
3296  * bond_xmit_hash - generate a hash value based on the xmit policy
3297  * @bond: bonding device
3298  * @skb: buffer to use for headers
3299  *
3300  * This function will extract the necessary headers from the skb buffer and use
3301  * them to generate a hash based on the xmit_policy set in the bonding device
3302  */
3303 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3304 {
3305         struct flow_keys flow;
3306         u32 hash;
3307
3308         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3309             skb->l4_hash)
3310                 return skb->hash;
3311
3312         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3313             !bond_flow_dissect(bond, skb, &flow))
3314                 return bond_eth_hash(skb);
3315
3316         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3317             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3318                 hash = bond_eth_hash(skb);
3319         else
3320                 hash = (__force u32)flow.ports.ports;
3321         hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3322                 (__force u32)flow_get_u32_src(&flow);
3323         hash ^= (hash >> 16);
3324         hash ^= (hash >> 8);
3325
3326         return hash >> 1;
3327 }
3328
3329 /*-------------------------- Device entry points ----------------------------*/
3330
3331 void bond_work_init_all(struct bonding *bond)
3332 {
3333         INIT_DELAYED_WORK(&bond->mcast_work,
3334                           bond_resend_igmp_join_requests_delayed);
3335         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3336         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3337         INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3338         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3339         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3340 }
3341
3342 static void bond_work_cancel_all(struct bonding *bond)
3343 {
3344         cancel_delayed_work_sync(&bond->mii_work);
3345         cancel_delayed_work_sync(&bond->arp_work);
3346         cancel_delayed_work_sync(&bond->alb_work);
3347         cancel_delayed_work_sync(&bond->ad_work);
3348         cancel_delayed_work_sync(&bond->mcast_work);
3349         cancel_delayed_work_sync(&bond->slave_arr_work);
3350 }
3351
3352 static int bond_open(struct net_device *bond_dev)
3353 {
3354         struct bonding *bond = netdev_priv(bond_dev);
3355         struct list_head *iter;
3356         struct slave *slave;
3357
3358         /* reset slave->backup and slave->inactive */
3359         if (bond_has_slaves(bond)) {
3360                 bond_for_each_slave(bond, slave, iter) {
3361                         if (bond_uses_primary(bond) &&
3362                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3363                                 bond_set_slave_inactive_flags(slave,
3364                                                               BOND_SLAVE_NOTIFY_NOW);
3365                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3366                                 bond_set_slave_active_flags(slave,
3367                                                             BOND_SLAVE_NOTIFY_NOW);
3368                         }
3369                 }
3370         }
3371
3372         if (bond_is_lb(bond)) {
3373                 /* bond_alb_initialize must be called before the timer
3374                  * is started.
3375                  */
3376                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3377                         return -ENOMEM;
3378                 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3379                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3380         }
3381
3382         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3383                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3384
3385         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3386                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3387                 bond->recv_probe = bond_arp_rcv;
3388         }
3389
3390         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3391                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3392                 /* register to receive LACPDUs */
3393                 bond->recv_probe = bond_3ad_lacpdu_recv;
3394                 bond_3ad_initiate_agg_selection(bond, 1);
3395         }
3396
3397         if (bond_mode_can_use_xmit_hash(bond))
3398                 bond_update_slave_arr(bond, NULL);
3399
3400         return 0;
3401 }
3402
3403 static int bond_close(struct net_device *bond_dev)
3404 {
3405         struct bonding *bond = netdev_priv(bond_dev);
3406
3407         bond_work_cancel_all(bond);
3408         bond->send_peer_notif = 0;
3409         if (bond_is_lb(bond))
3410                 bond_alb_deinitialize(bond);
3411         bond->recv_probe = NULL;
3412
3413         return 0;
3414 }
3415
3416 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3417  * that some drivers can provide 32bit values only.
3418  */
3419 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3420                             const struct rtnl_link_stats64 *_new,
3421                             const struct rtnl_link_stats64 *_old)
3422 {
3423         const u64 *new = (const u64 *)_new;
3424         const u64 *old = (const u64 *)_old;
3425         u64 *res = (u64 *)_res;
3426         int i;
3427
3428         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3429                 u64 nv = new[i];
3430                 u64 ov = old[i];
3431                 s64 delta = nv - ov;
3432
3433                 /* detects if this particular field is 32bit only */
3434                 if (((nv | ov) >> 32) == 0)
3435                         delta = (s64)(s32)((u32)nv - (u32)ov);
3436
3437                 /* filter anomalies, some drivers reset their stats
3438                  * at down/up events.
3439                  */
3440                 if (delta > 0)
3441                         res[i] += delta;
3442         }
3443 }
3444
3445 static int bond_get_nest_level(struct net_device *bond_dev)
3446 {
3447         struct bonding *bond = netdev_priv(bond_dev);
3448
3449         return bond->nest_level;
3450 }
3451
3452 static void bond_get_stats(struct net_device *bond_dev,
3453                            struct rtnl_link_stats64 *stats)
3454 {
3455         struct bonding *bond = netdev_priv(bond_dev);
3456         struct rtnl_link_stats64 temp;
3457         struct list_head *iter;
3458         struct slave *slave;
3459
3460         spin_lock_nested(&bond->stats_lock, bond_get_nest_level(bond_dev));
3461         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3462
3463         rcu_read_lock();
3464         bond_for_each_slave_rcu(bond, slave, iter) {
3465                 const struct rtnl_link_stats64 *new =
3466                         dev_get_stats(slave->dev, &temp);
3467
3468                 bond_fold_stats(stats, new, &slave->slave_stats);
3469
3470                 /* save off the slave stats for the next run */
3471                 memcpy(&slave->slave_stats, new, sizeof(*new));
3472         }
3473         rcu_read_unlock();
3474
3475         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3476         spin_unlock(&bond->stats_lock);
3477 }
3478
3479 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3480 {
3481         struct bonding *bond = netdev_priv(bond_dev);
3482         struct net_device *slave_dev = NULL;
3483         struct ifbond k_binfo;
3484         struct ifbond __user *u_binfo = NULL;
3485         struct ifslave k_sinfo;
3486         struct ifslave __user *u_sinfo = NULL;
3487         struct mii_ioctl_data *mii = NULL;
3488         struct bond_opt_value newval;
3489         struct net *net;
3490         int res = 0;
3491
3492         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3493
3494         switch (cmd) {
3495         case SIOCGMIIPHY:
3496                 mii = if_mii(ifr);
3497                 if (!mii)
3498                         return -EINVAL;
3499
3500                 mii->phy_id = 0;
3501                 /* Fall Through */
3502         case SIOCGMIIREG:
3503                 /* We do this again just in case we were called by SIOCGMIIREG
3504                  * instead of SIOCGMIIPHY.
3505                  */
3506                 mii = if_mii(ifr);
3507                 if (!mii)
3508                         return -EINVAL;
3509
3510                 if (mii->reg_num == 1) {
3511                         mii->val_out = 0;
3512                         if (netif_carrier_ok(bond->dev))
3513                                 mii->val_out = BMSR_LSTATUS;
3514                 }
3515
3516                 return 0;
3517         case BOND_INFO_QUERY_OLD:
3518         case SIOCBONDINFOQUERY:
3519                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3520
3521                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3522                         return -EFAULT;
3523
3524                 bond_info_query(bond_dev, &k_binfo);
3525                 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3526                         return -EFAULT;
3527
3528                 return 0;
3529         case BOND_SLAVE_INFO_QUERY_OLD:
3530         case SIOCBONDSLAVEINFOQUERY:
3531                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3532
3533                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3534                         return -EFAULT;
3535
3536                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3537                 if (res == 0 &&
3538                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3539                         return -EFAULT;
3540
3541                 return res;
3542         default:
3543                 break;
3544         }
3545
3546         net = dev_net(bond_dev);
3547
3548         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3549                 return -EPERM;
3550
3551         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3552
3553         slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3554
3555         if (!slave_dev)
3556                 return -ENODEV;
3557
3558         switch (cmd) {
3559         case BOND_ENSLAVE_OLD:
3560         case SIOCBONDENSLAVE:
3561                 res = bond_enslave(bond_dev, slave_dev, NULL);
3562                 break;
3563         case BOND_RELEASE_OLD:
3564         case SIOCBONDRELEASE:
3565                 res = bond_release(bond_dev, slave_dev);
3566                 break;
3567         case BOND_SETHWADDR_OLD:
3568         case SIOCBONDSETHWADDR:
3569                 res = bond_set_dev_addr(bond_dev, slave_dev);
3570                 break;
3571         case BOND_CHANGE_ACTIVE_OLD:
3572         case SIOCBONDCHANGEACTIVE:
3573                 bond_opt_initstr(&newval, slave_dev->name);
3574                 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3575                                             &newval);
3576                 break;
3577         default:
3578                 res = -EOPNOTSUPP;
3579         }
3580
3581         return res;
3582 }
3583
3584 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3585 {
3586         struct bonding *bond = netdev_priv(bond_dev);
3587
3588         if (change & IFF_PROMISC)
3589                 bond_set_promiscuity(bond,
3590                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3591
3592         if (change & IFF_ALLMULTI)
3593                 bond_set_allmulti(bond,
3594                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3595 }
3596
3597 static void bond_set_rx_mode(struct net_device *bond_dev)
3598 {
3599         struct bonding *bond = netdev_priv(bond_dev);
3600         struct list_head *iter;
3601         struct slave *slave;
3602
3603         rcu_read_lock();
3604         if (bond_uses_primary(bond)) {
3605                 slave = rcu_dereference(bond->curr_active_slave);
3606                 if (slave) {
3607                         dev_uc_sync(slave->dev, bond_dev);
3608                         dev_mc_sync(slave->dev, bond_dev);
3609                 }
3610         } else {
3611                 bond_for_each_slave_rcu(bond, slave, iter) {
3612                         dev_uc_sync_multiple(slave->dev, bond_dev);
3613                         dev_mc_sync_multiple(slave->dev, bond_dev);
3614                 }
3615         }
3616         rcu_read_unlock();
3617 }
3618
3619 static int bond_neigh_init(struct neighbour *n)
3620 {
3621         struct bonding *bond = netdev_priv(n->dev);
3622         const struct net_device_ops *slave_ops;
3623         struct neigh_parms parms;
3624         struct slave *slave;
3625         int ret;
3626
3627         slave = bond_first_slave(bond);
3628         if (!slave)
3629                 return 0;
3630         slave_ops = slave->dev->netdev_ops;
3631         if (!slave_ops->ndo_neigh_setup)
3632                 return 0;
3633
3634         parms.neigh_setup = NULL;
3635         parms.neigh_cleanup = NULL;
3636         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3637         if (ret)
3638                 return ret;
3639
3640         /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3641          * after the last slave has been detached.  Assumes that all slaves
3642          * utilize the same neigh_cleanup (true at this writing as only user
3643          * is ipoib).
3644          */
3645         n->parms->neigh_cleanup = parms.neigh_cleanup;
3646
3647         if (!parms.neigh_setup)
3648                 return 0;
3649
3650         return parms.neigh_setup(n);
3651 }
3652
3653 /* The bonding ndo_neigh_setup is called at init time beofre any
3654  * slave exists. So we must declare proxy setup function which will
3655  * be used at run time to resolve the actual slave neigh param setup.
3656  *
3657  * It's also called by master devices (such as vlans) to setup their
3658  * underlying devices. In that case - do nothing, we're already set up from
3659  * our init.
3660  */
3661 static int bond_neigh_setup(struct net_device *dev,
3662                             struct neigh_parms *parms)
3663 {
3664         /* modify only our neigh_parms */
3665         if (parms->dev == dev)
3666                 parms->neigh_setup = bond_neigh_init;
3667
3668         return 0;
3669 }
3670
3671 /* Change the MTU of all of a master's slaves to match the master */
3672 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3673 {
3674         struct bonding *bond = netdev_priv(bond_dev);
3675         struct slave *slave, *rollback_slave;
3676         struct list_head *iter;
3677         int res = 0;
3678
3679         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3680
3681         bond_for_each_slave(bond, slave, iter) {
3682                 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
3683                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3684
3685                 res = dev_set_mtu(slave->dev, new_mtu);
3686
3687                 if (res) {
3688                         /* If we failed to set the slave's mtu to the new value
3689                          * we must abort the operation even in ACTIVE_BACKUP
3690                          * mode, because if we allow the backup slaves to have
3691                          * different mtu values than the active slave we'll
3692                          * need to change their mtu when doing a failover. That
3693                          * means changing their mtu from timer context, which
3694                          * is probably not a good idea.
3695                          */
3696                         slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
3697                                   res, new_mtu);
3698                         goto unwind;
3699                 }
3700         }
3701
3702         bond_dev->mtu = new_mtu;
3703
3704         return 0;
3705
3706 unwind:
3707         /* unwind from head to the slave that failed */
3708         bond_for_each_slave(bond, rollback_slave, iter) {
3709                 int tmp_res;
3710
3711                 if (rollback_slave == slave)
3712                         break;
3713
3714                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3715                 if (tmp_res)
3716                         slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
3717                                   tmp_res);
3718         }
3719
3720         return res;
3721 }
3722
3723 /* Change HW address
3724  *
3725  * Note that many devices must be down to change the HW address, and
3726  * downing the master releases all slaves.  We can make bonds full of
3727  * bonding devices to test this, however.
3728  */
3729 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3730 {
3731         struct bonding *bond = netdev_priv(bond_dev);
3732         struct slave *slave, *rollback_slave;
3733         struct sockaddr_storage *ss = addr, tmp_ss;
3734         struct list_head *iter;
3735         int res = 0;
3736
3737         if (BOND_MODE(bond) == BOND_MODE_ALB)
3738                 return bond_alb_set_mac_address(bond_dev, addr);
3739
3740
3741         netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
3742
3743         /* If fail_over_mac is enabled, do nothing and return success.
3744          * Returning an error causes ifenslave to fail.
3745          */
3746         if (bond->params.fail_over_mac &&
3747             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3748                 return 0;
3749
3750         if (!is_valid_ether_addr(ss->__data))
3751                 return -EADDRNOTAVAIL;
3752
3753         bond_for_each_slave(bond, slave, iter) {
3754                 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
3755                           __func__, slave);
3756                 res = dev_set_mac_address(slave->dev, addr, NULL);
3757                 if (res) {
3758                         /* TODO: consider downing the slave
3759                          * and retry ?
3760                          * User should expect communications
3761                          * breakage anyway until ARP finish
3762                          * updating, so...
3763                          */
3764                         slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
3765                                   __func__, res);
3766                         goto unwind;
3767                 }
3768         }
3769
3770         /* success */
3771         memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
3772         return 0;
3773
3774 unwind:
3775         memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
3776         tmp_ss.ss_family = bond_dev->type;
3777
3778         /* unwind from head to the slave that failed */
3779         bond_for_each_slave(bond, rollback_slave, iter) {
3780                 int tmp_res;
3781
3782                 if (rollback_slave == slave)
3783                         break;
3784
3785                 tmp_res = dev_set_mac_address(rollback_slave->dev,
3786                                               (struct sockaddr *)&tmp_ss, NULL);
3787                 if (tmp_res) {
3788                         slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
3789                                    __func__, tmp_res);
3790                 }
3791         }
3792
3793         return res;
3794 }
3795
3796 /**
3797  * bond_xmit_slave_id - transmit skb through slave with slave_id
3798  * @bond: bonding device that is transmitting
3799  * @skb: buffer to transmit
3800  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3801  *
3802  * This function tries to transmit through slave with slave_id but in case
3803  * it fails, it tries to find the first available slave for transmission.
3804  * The skb is consumed in all cases, thus the function is void.
3805  */
3806 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3807 {
3808         struct list_head *iter;
3809         struct slave *slave;
3810         int i = slave_id;
3811
3812         /* Here we start from the slave with slave_id */
3813         bond_for_each_slave_rcu(bond, slave, iter) {
3814                 if (--i < 0) {
3815                         if (bond_slave_can_tx(slave)) {
3816                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3817                                 return;
3818                         }
3819                 }
3820         }
3821
3822         /* Here we start from the first slave up to slave_id */
3823         i = slave_id;
3824         bond_for_each_slave_rcu(bond, slave, iter) {
3825                 if (--i < 0)
3826                         break;
3827                 if (bond_slave_can_tx(slave)) {
3828                         bond_dev_queue_xmit(bond, skb, slave->dev);
3829                         return;
3830                 }
3831         }
3832         /* no slave that can tx has been found */
3833         bond_tx_drop(bond->dev, skb);
3834 }
3835
3836 /**
3837  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3838  * @bond: bonding device to use
3839  *
3840  * Based on the value of the bonding device's packets_per_slave parameter
3841  * this function generates a slave id, which is usually used as the next
3842  * slave to transmit through.
3843  */
3844 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3845 {
3846         u32 slave_id;
3847         struct reciprocal_value reciprocal_packets_per_slave;
3848         int packets_per_slave = bond->params.packets_per_slave;
3849
3850         switch (packets_per_slave) {
3851         case 0:
3852                 slave_id = prandom_u32();
3853                 break;
3854         case 1:
3855                 slave_id = bond->rr_tx_counter;
3856                 break;
3857         default:
3858                 reciprocal_packets_per_slave =
3859                         bond->params.reciprocal_packets_per_slave;
3860                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3861                                              reciprocal_packets_per_slave);
3862                 break;
3863         }
3864         bond->rr_tx_counter++;
3865
3866         return slave_id;
3867 }
3868
3869 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
3870                                         struct net_device *bond_dev)
3871 {
3872         struct bonding *bond = netdev_priv(bond_dev);
3873         struct slave *slave;
3874         int slave_cnt;
3875         u32 slave_id;
3876
3877         /* Start with the curr_active_slave that joined the bond as the
3878          * default for sending IGMP traffic.  For failover purposes one
3879          * needs to maintain some consistency for the interface that will
3880          * send the join/membership reports.  The curr_active_slave found
3881          * will send all of this type of traffic.
3882          */
3883         if (skb->protocol == htons(ETH_P_IP)) {
3884                 int noff = skb_network_offset(skb);
3885                 struct iphdr *iph;
3886
3887                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3888                         goto non_igmp;
3889
3890                 iph = ip_hdr(skb);
3891                 if (iph->protocol == IPPROTO_IGMP) {
3892                         slave = rcu_dereference(bond->curr_active_slave);
3893                         if (slave)
3894                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3895                         else
3896                                 bond_xmit_slave_id(bond, skb, 0);
3897                         return NETDEV_TX_OK;
3898                 }
3899         }
3900
3901 non_igmp:
3902         slave_cnt = READ_ONCE(bond->slave_cnt);
3903         if (likely(slave_cnt)) {
3904                 slave_id = bond_rr_gen_slave_id(bond);
3905                 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3906         } else {
3907                 bond_tx_drop(bond_dev, skb);
3908         }
3909         return NETDEV_TX_OK;
3910 }
3911
3912 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3913  * the bond has a usable interface.
3914  */
3915 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
3916                                           struct net_device *bond_dev)
3917 {
3918         struct bonding *bond = netdev_priv(bond_dev);
3919         struct slave *slave;
3920
3921         slave = rcu_dereference(bond->curr_active_slave);
3922         if (slave)
3923                 bond_dev_queue_xmit(bond, skb, slave->dev);
3924         else
3925                 bond_tx_drop(bond_dev, skb);
3926
3927         return NETDEV_TX_OK;
3928 }
3929
3930 /* Use this to update slave_array when (a) it's not appropriate to update
3931  * slave_array right away (note that update_slave_array() may sleep)
3932  * and / or (b) RTNL is not held.
3933  */
3934 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3935 {
3936         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3937 }
3938
3939 /* Slave array work handler. Holds only RTNL */
3940 static void bond_slave_arr_handler(struct work_struct *work)
3941 {
3942         struct bonding *bond = container_of(work, struct bonding,
3943                                             slave_arr_work.work);
3944         int ret;
3945
3946         if (!rtnl_trylock())
3947                 goto err;
3948
3949         ret = bond_update_slave_arr(bond, NULL);
3950         rtnl_unlock();
3951         if (ret) {
3952                 pr_warn_ratelimited("Failed to update slave array from WT\n");
3953                 goto err;
3954         }
3955         return;
3956
3957 err:
3958         bond_slave_arr_work_rearm(bond, 1);
3959 }
3960
3961 /* Build the usable slaves array in control path for modes that use xmit-hash
3962  * to determine the slave interface -
3963  * (a) BOND_MODE_8023AD
3964  * (b) BOND_MODE_XOR
3965  * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
3966  *
3967  * The caller is expected to hold RTNL only and NO other lock!
3968  */
3969 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3970 {
3971         struct slave *slave;
3972         struct list_head *iter;
3973         struct bond_up_slave *new_arr, *old_arr;
3974         int agg_id = 0;
3975         int ret = 0;
3976
3977 #ifdef CONFIG_LOCKDEP
3978         WARN_ON(lockdep_is_held(&bond->mode_lock));
3979 #endif
3980
3981         new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3982                           GFP_KERNEL);
3983         if (!new_arr) {
3984                 ret = -ENOMEM;
3985                 pr_err("Failed to build slave-array.\n");
3986                 goto out;
3987         }
3988         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3989                 struct ad_info ad_info;
3990
3991                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3992                         pr_debug("bond_3ad_get_active_agg_info failed\n");
3993                         kfree_rcu(new_arr, rcu);
3994                         /* No active aggragator means it's not safe to use
3995                          * the previous array.
3996                          */
3997                         old_arr = rtnl_dereference(bond->slave_arr);
3998                         if (old_arr) {
3999                                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4000                                 kfree_rcu(old_arr, rcu);
4001                         }
4002                         goto out;
4003                 }
4004                 agg_id = ad_info.aggregator_id;
4005         }
4006         bond_for_each_slave(bond, slave, iter) {
4007                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4008                         struct aggregator *agg;
4009
4010                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
4011                         if (!agg || agg->aggregator_identifier != agg_id)
4012                                 continue;
4013                 }
4014                 if (!bond_slave_can_tx(slave))
4015                         continue;
4016                 if (skipslave == slave)
4017                         continue;
4018
4019                 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4020                           new_arr->count);
4021
4022                 new_arr->arr[new_arr->count++] = slave;
4023         }
4024
4025         old_arr = rtnl_dereference(bond->slave_arr);
4026         rcu_assign_pointer(bond->slave_arr, new_arr);
4027         if (old_arr)
4028                 kfree_rcu(old_arr, rcu);
4029 out:
4030         if (ret != 0 && skipslave) {
4031                 int idx;
4032
4033                 /* Rare situation where caller has asked to skip a specific
4034                  * slave but allocation failed (most likely!). BTW this is
4035                  * only possible when the call is initiated from
4036                  * __bond_release_one(). In this situation; overwrite the
4037                  * skipslave entry in the array with the last entry from the
4038                  * array to avoid a situation where the xmit path may choose
4039                  * this to-be-skipped slave to send a packet out.
4040                  */
4041                 old_arr = rtnl_dereference(bond->slave_arr);
4042                 for (idx = 0; idx < old_arr->count; idx++) {
4043                         if (skipslave == old_arr->arr[idx]) {
4044                                 old_arr->arr[idx] =
4045                                     old_arr->arr[old_arr->count-1];
4046                                 old_arr->count--;
4047                                 break;
4048                         }
4049                 }
4050         }
4051         return ret;
4052 }
4053
4054 /* Use this Xmit function for 3AD as well as XOR modes. The current
4055  * usable slave array is formed in the control path. The xmit function
4056  * just calculates hash and sends the packet out.
4057  */
4058 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4059                                      struct net_device *dev)
4060 {
4061         struct bonding *bond = netdev_priv(dev);
4062         struct slave *slave;
4063         struct bond_up_slave *slaves;
4064         unsigned int count;
4065
4066         slaves = rcu_dereference(bond->slave_arr);
4067         count = slaves ? READ_ONCE(slaves->count) : 0;
4068         if (likely(count)) {
4069                 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
4070                 bond_dev_queue_xmit(bond, skb, slave->dev);
4071         } else {
4072                 bond_tx_drop(dev, skb);
4073         }
4074
4075         return NETDEV_TX_OK;
4076 }
4077
4078 /* in broadcast mode, we send everything to all usable interfaces. */
4079 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4080                                        struct net_device *bond_dev)
4081 {
4082         struct bonding *bond = netdev_priv(bond_dev);
4083         struct slave *slave = NULL;
4084         struct list_head *iter;
4085
4086         bond_for_each_slave_rcu(bond, slave, iter) {
4087                 if (bond_is_last_slave(bond, slave))
4088                         break;
4089                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4090                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4091
4092                         if (!skb2) {
4093                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4094                                                     bond_dev->name, __func__);
4095                                 continue;
4096                         }
4097                         bond_dev_queue_xmit(bond, skb2, slave->dev);
4098                 }
4099         }
4100         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4101                 bond_dev_queue_xmit(bond, skb, slave->dev);
4102         else
4103                 bond_tx_drop(bond_dev, skb);
4104
4105         return NETDEV_TX_OK;
4106 }
4107
4108 /*------------------------- Device initialization ---------------------------*/
4109
4110 /* Lookup the slave that corresponds to a qid */
4111 static inline int bond_slave_override(struct bonding *bond,
4112                                       struct sk_buff *skb)
4113 {
4114         struct slave *slave = NULL;
4115         struct list_head *iter;
4116
4117         if (!skb_rx_queue_recorded(skb))
4118                 return 1;
4119
4120         /* Find out if any slaves have the same mapping as this skb. */
4121         bond_for_each_slave_rcu(bond, slave, iter) {
4122                 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4123                         if (bond_slave_is_up(slave) &&
4124                             slave->link == BOND_LINK_UP) {
4125                                 bond_dev_queue_xmit(bond, skb, slave->dev);
4126                                 return 0;
4127                         }
4128                         /* If the slave isn't UP, use default transmit policy. */
4129                         break;
4130                 }
4131         }
4132
4133         return 1;
4134 }
4135
4136
4137 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4138                              struct net_device *sb_dev)
4139 {
4140         /* This helper function exists to help dev_pick_tx get the correct
4141          * destination queue.  Using a helper function skips a call to
4142          * skb_tx_hash and will put the skbs in the queue we expect on their
4143          * way down to the bonding driver.
4144          */
4145         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4146
4147         /* Save the original txq to restore before passing to the driver */
4148         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4149
4150         if (unlikely(txq >= dev->real_num_tx_queues)) {
4151                 do {
4152                         txq -= dev->real_num_tx_queues;
4153                 } while (txq >= dev->real_num_tx_queues);
4154         }
4155         return txq;
4156 }
4157
4158 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4159 {
4160         struct bonding *bond = netdev_priv(dev);
4161
4162         if (bond_should_override_tx_queue(bond) &&
4163             !bond_slave_override(bond, skb))
4164                 return NETDEV_TX_OK;
4165
4166         switch (BOND_MODE(bond)) {
4167         case BOND_MODE_ROUNDROBIN:
4168                 return bond_xmit_roundrobin(skb, dev);
4169         case BOND_MODE_ACTIVEBACKUP:
4170                 return bond_xmit_activebackup(skb, dev);
4171         case BOND_MODE_8023AD:
4172         case BOND_MODE_XOR:
4173                 return bond_3ad_xor_xmit(skb, dev);
4174         case BOND_MODE_BROADCAST:
4175                 return bond_xmit_broadcast(skb, dev);
4176         case BOND_MODE_ALB:
4177                 return bond_alb_xmit(skb, dev);
4178         case BOND_MODE_TLB:
4179                 return bond_tlb_xmit(skb, dev);
4180         default:
4181                 /* Should never happen, mode already checked */
4182                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4183                 WARN_ON_ONCE(1);
4184                 bond_tx_drop(dev, skb);
4185                 return NETDEV_TX_OK;
4186         }
4187 }
4188
4189 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4190 {
4191         struct bonding *bond = netdev_priv(dev);
4192         netdev_tx_t ret = NETDEV_TX_OK;
4193
4194         /* If we risk deadlock from transmitting this in the
4195          * netpoll path, tell netpoll to queue the frame for later tx
4196          */
4197         if (unlikely(is_netpoll_tx_blocked(dev)))
4198                 return NETDEV_TX_BUSY;
4199
4200         rcu_read_lock();
4201         if (bond_has_slaves(bond))
4202                 ret = __bond_start_xmit(skb, dev);
4203         else
4204                 bond_tx_drop(dev, skb);
4205         rcu_read_unlock();
4206
4207         return ret;
4208 }
4209
4210 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4211                                            struct ethtool_link_ksettings *cmd)
4212 {
4213         struct bonding *bond = netdev_priv(bond_dev);
4214         unsigned long speed = 0;
4215         struct list_head *iter;
4216         struct slave *slave;
4217
4218         cmd->base.duplex = DUPLEX_UNKNOWN;
4219         cmd->base.port = PORT_OTHER;
4220
4221         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4222          * do not need to check mode.  Though link speed might not represent
4223          * the true receive or transmit bandwidth (not all modes are symmetric)
4224          * this is an accurate maximum.
4225          */
4226         bond_for_each_slave(bond, slave, iter) {
4227                 if (bond_slave_can_tx(slave)) {
4228                         if (slave->speed != SPEED_UNKNOWN)
4229                                 speed += slave->speed;
4230                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4231                             slave->duplex != DUPLEX_UNKNOWN)
4232                                 cmd->base.duplex = slave->duplex;
4233                 }
4234         }
4235         cmd->base.speed = speed ? : SPEED_UNKNOWN;
4236
4237         return 0;
4238 }
4239
4240 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4241                                      struct ethtool_drvinfo *drvinfo)
4242 {
4243         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4244         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4245         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4246                  BOND_ABI_VERSION);
4247 }
4248
4249 static const struct ethtool_ops bond_ethtool_ops = {
4250         .get_drvinfo            = bond_ethtool_get_drvinfo,
4251         .get_link               = ethtool_op_get_link,
4252         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4253 };
4254
4255 static const struct net_device_ops bond_netdev_ops = {
4256         .ndo_init               = bond_init,
4257         .ndo_uninit             = bond_uninit,
4258         .ndo_open               = bond_open,
4259         .ndo_stop               = bond_close,
4260         .ndo_start_xmit         = bond_start_xmit,
4261         .ndo_select_queue       = bond_select_queue,
4262         .ndo_get_stats64        = bond_get_stats,
4263         .ndo_do_ioctl           = bond_do_ioctl,
4264         .ndo_change_rx_flags    = bond_change_rx_flags,
4265         .ndo_set_rx_mode        = bond_set_rx_mode,
4266         .ndo_change_mtu         = bond_change_mtu,
4267         .ndo_set_mac_address    = bond_set_mac_address,
4268         .ndo_neigh_setup        = bond_neigh_setup,
4269         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4270         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4271         .ndo_get_lock_subclass  = bond_get_nest_level,
4272 #ifdef CONFIG_NET_POLL_CONTROLLER
4273         .ndo_netpoll_setup      = bond_netpoll_setup,
4274         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4275         .ndo_poll_controller    = bond_poll_controller,
4276 #endif
4277         .ndo_add_slave          = bond_enslave,
4278         .ndo_del_slave          = bond_release,
4279         .ndo_fix_features       = bond_fix_features,
4280         .ndo_features_check     = passthru_features_check,
4281 };
4282
4283 static const struct device_type bond_type = {
4284         .name = "bond",
4285 };
4286
4287 static void bond_destructor(struct net_device *bond_dev)
4288 {
4289         struct bonding *bond = netdev_priv(bond_dev);
4290         if (bond->wq)
4291                 destroy_workqueue(bond->wq);
4292 }
4293
4294 void bond_setup(struct net_device *bond_dev)
4295 {
4296         struct bonding *bond = netdev_priv(bond_dev);
4297
4298         spin_lock_init(&bond->mode_lock);
4299         spin_lock_init(&bond->stats_lock);
4300         bond->params = bonding_defaults;
4301
4302         /* Initialize pointers */
4303         bond->dev = bond_dev;
4304
4305         /* Initialize the device entry points */
4306         ether_setup(bond_dev);
4307         bond_dev->max_mtu = ETH_MAX_MTU;
4308         bond_dev->netdev_ops = &bond_netdev_ops;
4309         bond_dev->ethtool_ops = &bond_ethtool_ops;
4310
4311         bond_dev->needs_free_netdev = true;
4312         bond_dev->priv_destructor = bond_destructor;
4313
4314         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4315
4316         /* Initialize the device options */
4317         bond_dev->flags |= IFF_MASTER;
4318         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4319         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4320
4321         /* don't acquire bond device's netif_tx_lock when transmitting */
4322         bond_dev->features |= NETIF_F_LLTX;
4323
4324         /* By default, we declare the bond to be fully
4325          * VLAN hardware accelerated capable. Special
4326          * care is taken in the various xmit functions
4327          * when there are slaves that are not hw accel
4328          * capable
4329          */
4330
4331         /* Don't allow bond devices to change network namespaces. */
4332         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4333
4334         bond_dev->hw_features = BOND_VLAN_FEATURES |
4335                                 NETIF_F_HW_VLAN_CTAG_RX |
4336                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4337
4338         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4;
4339         bond_dev->features |= bond_dev->hw_features;
4340         bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4341 }
4342
4343 /* Destroy a bonding device.
4344  * Must be under rtnl_lock when this function is called.
4345  */
4346 static void bond_uninit(struct net_device *bond_dev)
4347 {
4348         struct bonding *bond = netdev_priv(bond_dev);
4349         struct list_head *iter;
4350         struct slave *slave;
4351         struct bond_up_slave *arr;
4352
4353         bond_netpoll_cleanup(bond_dev);
4354
4355         /* Release the bonded slaves */
4356         bond_for_each_slave(bond, slave, iter)
4357                 __bond_release_one(bond_dev, slave->dev, true, true);
4358         netdev_info(bond_dev, "Released all slaves\n");
4359
4360         arr = rtnl_dereference(bond->slave_arr);
4361         if (arr) {
4362                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4363                 kfree_rcu(arr, rcu);
4364         }
4365
4366         list_del(&bond->bond_list);
4367
4368         bond_debug_unregister(bond);
4369 }
4370
4371 /*------------------------- Module initialization ---------------------------*/
4372
4373 static int bond_check_params(struct bond_params *params)
4374 {
4375         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4376         struct bond_opt_value newval;
4377         const struct bond_opt_value *valptr;
4378         int arp_all_targets_value = 0;
4379         u16 ad_actor_sys_prio = 0;
4380         u16 ad_user_port_key = 0;
4381         __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4382         int arp_ip_count;
4383         int bond_mode   = BOND_MODE_ROUNDROBIN;
4384         int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4385         int lacp_fast = 0;
4386         int tlb_dynamic_lb;
4387
4388         /* Convert string parameters. */
4389         if (mode) {
4390                 bond_opt_initstr(&newval, mode);
4391                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4392                 if (!valptr) {
4393                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4394                         return -EINVAL;
4395                 }
4396                 bond_mode = valptr->value;
4397         }
4398
4399         if (xmit_hash_policy) {
4400                 if (bond_mode == BOND_MODE_ROUNDROBIN ||
4401                     bond_mode == BOND_MODE_ACTIVEBACKUP ||
4402                     bond_mode == BOND_MODE_BROADCAST) {
4403                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4404                                 bond_mode_name(bond_mode));
4405                 } else {
4406                         bond_opt_initstr(&newval, xmit_hash_policy);
4407                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4408                                                 &newval);
4409                         if (!valptr) {
4410                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4411                                        xmit_hash_policy);
4412                                 return -EINVAL;
4413                         }
4414                         xmit_hashtype = valptr->value;
4415                 }
4416         }
4417
4418         if (lacp_rate) {
4419                 if (bond_mode != BOND_MODE_8023AD) {
4420                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4421                                 bond_mode_name(bond_mode));
4422                 } else {
4423                         bond_opt_initstr(&newval, lacp_rate);
4424                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4425                                                 &newval);
4426                         if (!valptr) {
4427                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4428                                        lacp_rate);
4429                                 return -EINVAL;
4430                         }
4431                         lacp_fast = valptr->value;
4432                 }
4433         }
4434
4435         if (ad_select) {
4436                 bond_opt_initstr(&newval, ad_select);
4437                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4438                                         &newval);
4439                 if (!valptr) {
4440                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4441                         return -EINVAL;
4442                 }
4443                 params->ad_select = valptr->value;
4444                 if (bond_mode != BOND_MODE_8023AD)
4445                         pr_warn("ad_select param only affects 802.3ad mode\n");
4446         } else {
4447                 params->ad_select = BOND_AD_STABLE;
4448         }
4449
4450         if (max_bonds < 0) {
4451                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4452                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4453                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4454         }
4455
4456         if (miimon < 0) {
4457                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4458                         miimon, INT_MAX);
4459                 miimon = 0;
4460         }
4461
4462         if (updelay < 0) {
4463                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4464                         updelay, INT_MAX);
4465                 updelay = 0;
4466         }
4467
4468         if (downdelay < 0) {
4469                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4470                         downdelay, INT_MAX);
4471                 downdelay = 0;
4472         }
4473
4474         if ((use_carrier != 0) && (use_carrier != 1)) {
4475                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4476                         use_carrier);
4477                 use_carrier = 1;
4478         }
4479
4480         if (num_peer_notif < 0 || num_peer_notif > 255) {
4481                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4482                         num_peer_notif);
4483                 num_peer_notif = 1;
4484         }
4485
4486         /* reset values for 802.3ad/TLB/ALB */
4487         if (!bond_mode_uses_arp(bond_mode)) {
4488                 if (!miimon) {
4489                         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");
4490                         pr_warn("Forcing miimon to 100msec\n");
4491                         miimon = BOND_DEFAULT_MIIMON;
4492                 }
4493         }
4494
4495         if (tx_queues < 1 || tx_queues > 255) {
4496                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4497                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4498                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4499         }
4500
4501         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4502                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4503                         all_slaves_active);
4504                 all_slaves_active = 0;
4505         }
4506
4507         if (resend_igmp < 0 || resend_igmp > 255) {
4508                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4509                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4510                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4511         }
4512
4513         bond_opt_initval(&newval, packets_per_slave);
4514         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4515                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4516                         packets_per_slave, USHRT_MAX);
4517                 packets_per_slave = 1;
4518         }
4519
4520         if (bond_mode == BOND_MODE_ALB) {
4521                 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",
4522                           updelay);
4523         }
4524
4525         if (!miimon) {
4526                 if (updelay || downdelay) {
4527                         /* just warn the user the up/down delay will have
4528                          * no effect since miimon is zero...
4529                          */
4530                         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",
4531                                 updelay, downdelay);
4532                 }
4533         } else {
4534                 /* don't allow arp monitoring */
4535                 if (arp_interval) {
4536                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4537                                 miimon, arp_interval);
4538                         arp_interval = 0;
4539                 }
4540
4541                 if ((updelay % miimon) != 0) {
4542                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4543                                 updelay, miimon, (updelay / miimon) * miimon);
4544                 }
4545
4546                 updelay /= miimon;
4547
4548                 if ((downdelay % miimon) != 0) {
4549                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4550                                 downdelay, miimon,
4551                                 (downdelay / miimon) * miimon);
4552                 }
4553
4554                 downdelay /= miimon;
4555         }
4556
4557         if (arp_interval < 0) {
4558                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4559                         arp_interval, INT_MAX);
4560                 arp_interval = 0;
4561         }
4562
4563         for (arp_ip_count = 0, i = 0;
4564              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4565                 __be32 ip;
4566
4567                 /* not a complete check, but good enough to catch mistakes */
4568                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4569                     !bond_is_ip_target_ok(ip)) {
4570                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4571                                 arp_ip_target[i]);
4572                         arp_interval = 0;
4573                 } else {
4574                         if (bond_get_targets_ip(arp_target, ip) == -1)
4575                                 arp_target[arp_ip_count++] = ip;
4576                         else
4577                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4578                                         &ip);
4579                 }
4580         }
4581
4582         if (arp_interval && !arp_ip_count) {
4583                 /* don't allow arping if no arp_ip_target given... */
4584                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4585                         arp_interval);
4586                 arp_interval = 0;
4587         }
4588
4589         if (arp_validate) {
4590                 if (!arp_interval) {
4591                         pr_err("arp_validate requires arp_interval\n");
4592                         return -EINVAL;
4593                 }
4594
4595                 bond_opt_initstr(&newval, arp_validate);
4596                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4597                                         &newval);
4598                 if (!valptr) {
4599                         pr_err("Error: invalid arp_validate \"%s\"\n",
4600                                arp_validate);
4601                         return -EINVAL;
4602                 }
4603                 arp_validate_value = valptr->value;
4604         } else {
4605                 arp_validate_value = 0;
4606         }
4607
4608         if (arp_all_targets) {
4609                 bond_opt_initstr(&newval, arp_all_targets);
4610                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4611                                         &newval);
4612                 if (!valptr) {
4613                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4614                                arp_all_targets);
4615                         arp_all_targets_value = 0;
4616                 } else {
4617                         arp_all_targets_value = valptr->value;
4618                 }
4619         }
4620
4621         if (miimon) {
4622                 pr_info("MII link monitoring set to %d ms\n", miimon);
4623         } else if (arp_interval) {
4624                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4625                                           arp_validate_value);
4626                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4627                         arp_interval, valptr->string, arp_ip_count);
4628
4629                 for (i = 0; i < arp_ip_count; i++)
4630                         pr_cont(" %s", arp_ip_target[i]);
4631
4632                 pr_cont("\n");
4633
4634         } else if (max_bonds) {
4635                 /* miimon and arp_interval not set, we need one so things
4636                  * work as expected, see bonding.txt for details
4637                  */
4638                 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");
4639         }
4640
4641         if (primary && !bond_mode_uses_primary(bond_mode)) {
4642                 /* currently, using a primary only makes sense
4643                  * in active backup, TLB or ALB modes
4644                  */
4645                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4646                         primary, bond_mode_name(bond_mode));
4647                 primary = NULL;
4648         }
4649
4650         if (primary && primary_reselect) {
4651                 bond_opt_initstr(&newval, primary_reselect);
4652                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4653                                         &newval);
4654                 if (!valptr) {
4655                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4656                                primary_reselect);
4657                         return -EINVAL;
4658                 }
4659                 primary_reselect_value = valptr->value;
4660         } else {
4661                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4662         }
4663
4664         if (fail_over_mac) {
4665                 bond_opt_initstr(&newval, fail_over_mac);
4666                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4667                                         &newval);
4668                 if (!valptr) {
4669                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4670                                fail_over_mac);
4671                         return -EINVAL;
4672                 }
4673                 fail_over_mac_value = valptr->value;
4674                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4675                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4676         } else {
4677                 fail_over_mac_value = BOND_FOM_NONE;
4678         }
4679
4680         bond_opt_initstr(&newval, "default");
4681         valptr = bond_opt_parse(
4682                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4683                                      &newval);
4684         if (!valptr) {
4685                 pr_err("Error: No ad_actor_sys_prio default value");
4686                 return -EINVAL;
4687         }
4688         ad_actor_sys_prio = valptr->value;
4689
4690         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4691                                 &newval);
4692         if (!valptr) {
4693                 pr_err("Error: No ad_user_port_key default value");
4694                 return -EINVAL;
4695         }
4696         ad_user_port_key = valptr->value;
4697
4698         bond_opt_initstr(&newval, "default");
4699         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
4700         if (!valptr) {
4701                 pr_err("Error: No tlb_dynamic_lb default value");
4702                 return -EINVAL;
4703         }
4704         tlb_dynamic_lb = valptr->value;
4705
4706         if (lp_interval == 0) {
4707                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4708                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4709                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4710         }
4711
4712         /* fill params struct with the proper values */
4713         params->mode = bond_mode;
4714         params->xmit_policy = xmit_hashtype;
4715         params->miimon = miimon;
4716         params->num_peer_notif = num_peer_notif;
4717         params->arp_interval = arp_interval;
4718         params->arp_validate = arp_validate_value;
4719         params->arp_all_targets = arp_all_targets_value;
4720         params->updelay = updelay;
4721         params->downdelay = downdelay;
4722         params->peer_notif_delay = 0;
4723         params->use_carrier = use_carrier;
4724         params->lacp_fast = lacp_fast;
4725         params->primary[0] = 0;
4726         params->primary_reselect = primary_reselect_value;
4727         params->fail_over_mac = fail_over_mac_value;
4728         params->tx_queues = tx_queues;
4729         params->all_slaves_active = all_slaves_active;
4730         params->resend_igmp = resend_igmp;
4731         params->min_links = min_links;
4732         params->lp_interval = lp_interval;
4733         params->packets_per_slave = packets_per_slave;
4734         params->tlb_dynamic_lb = tlb_dynamic_lb;
4735         params->ad_actor_sys_prio = ad_actor_sys_prio;
4736         eth_zero_addr(params->ad_actor_system);
4737         params->ad_user_port_key = ad_user_port_key;
4738         if (packets_per_slave > 0) {
4739                 params->reciprocal_packets_per_slave =
4740                         reciprocal_value(packets_per_slave);
4741         } else {
4742                 /* reciprocal_packets_per_slave is unused if
4743                  * packets_per_slave is 0 or 1, just initialize it
4744                  */
4745                 params->reciprocal_packets_per_slave =
4746                         (struct reciprocal_value) { 0 };
4747         }
4748
4749         if (primary) {
4750                 strncpy(params->primary, primary, IFNAMSIZ);
4751                 params->primary[IFNAMSIZ - 1] = 0;
4752         }
4753
4754         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4755
4756         return 0;
4757 }
4758
4759 /* Called from registration process */
4760 static int bond_init(struct net_device *bond_dev)
4761 {
4762         struct bonding *bond = netdev_priv(bond_dev);
4763         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4764
4765         netdev_dbg(bond_dev, "Begin bond_init\n");
4766
4767         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4768         if (!bond->wq)
4769                 return -ENOMEM;
4770
4771         bond->nest_level = SINGLE_DEPTH_NESTING;
4772         netdev_lockdep_set_classes(bond_dev);
4773
4774         list_add_tail(&bond->bond_list, &bn->dev_list);
4775
4776         bond_prepare_sysfs_group(bond);
4777
4778         bond_debug_register(bond);
4779
4780         /* Ensure valid dev_addr */
4781         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4782             bond_dev->addr_assign_type == NET_ADDR_PERM)
4783                 eth_hw_addr_random(bond_dev);
4784
4785         return 0;
4786 }
4787
4788 unsigned int bond_get_num_tx_queues(void)
4789 {
4790         return tx_queues;
4791 }
4792
4793 /* Create a new bond based on the specified name and bonding parameters.
4794  * If name is NULL, obtain a suitable "bond%d" name for us.
4795  * Caller must NOT hold rtnl_lock; we need to release it here before we
4796  * set up our sysfs entries.
4797  */
4798 int bond_create(struct net *net, const char *name)
4799 {
4800         struct net_device *bond_dev;
4801         struct bonding *bond;
4802         struct alb_bond_info *bond_info;
4803         int res;
4804
4805         rtnl_lock();
4806
4807         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4808                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4809                                    bond_setup, tx_queues);
4810         if (!bond_dev) {
4811                 pr_err("%s: eek! can't alloc netdev!\n", name);
4812                 rtnl_unlock();
4813                 return -ENOMEM;
4814         }
4815
4816         /*
4817          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4818          * It is set to 0 by default which is wrong.
4819          */
4820         bond = netdev_priv(bond_dev);
4821         bond_info = &(BOND_ALB_INFO(bond));
4822         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4823
4824         dev_net_set(bond_dev, net);
4825         bond_dev->rtnl_link_ops = &bond_link_ops;
4826
4827         res = register_netdevice(bond_dev);
4828
4829         netif_carrier_off(bond_dev);
4830
4831         bond_work_init_all(bond);
4832
4833         rtnl_unlock();
4834         if (res < 0)
4835                 free_netdev(bond_dev);
4836         return res;
4837 }
4838
4839 static int __net_init bond_net_init(struct net *net)
4840 {
4841         struct bond_net *bn = net_generic(net, bond_net_id);
4842
4843         bn->net = net;
4844         INIT_LIST_HEAD(&bn->dev_list);
4845
4846         bond_create_proc_dir(bn);
4847         bond_create_sysfs(bn);
4848
4849         return 0;
4850 }
4851
4852 static void __net_exit bond_net_exit(struct net *net)
4853 {
4854         struct bond_net *bn = net_generic(net, bond_net_id);
4855         struct bonding *bond, *tmp_bond;
4856         LIST_HEAD(list);
4857
4858         bond_destroy_sysfs(bn);
4859
4860         /* Kill off any bonds created after unregistering bond rtnl ops */
4861         rtnl_lock();
4862         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4863                 unregister_netdevice_queue(bond->dev, &list);
4864         unregister_netdevice_many(&list);
4865         rtnl_unlock();
4866
4867         bond_destroy_proc_dir(bn);
4868 }
4869
4870 static struct pernet_operations bond_net_ops = {
4871         .init = bond_net_init,
4872         .exit = bond_net_exit,
4873         .id   = &bond_net_id,
4874         .size = sizeof(struct bond_net),
4875 };
4876
4877 static int __init bonding_init(void)
4878 {
4879         int i;
4880         int res;
4881
4882         pr_info("%s", bond_version);
4883
4884         res = bond_check_params(&bonding_defaults);
4885         if (res)
4886                 goto out;
4887
4888         res = register_pernet_subsys(&bond_net_ops);
4889         if (res)
4890                 goto out;
4891
4892         res = bond_netlink_init();
4893         if (res)
4894                 goto err_link;
4895
4896         bond_create_debugfs();
4897
4898         for (i = 0; i < max_bonds; i++) {
4899                 res = bond_create(&init_net, NULL);
4900                 if (res)
4901                         goto err;
4902         }
4903
4904         register_netdevice_notifier(&bond_netdev_notifier);
4905 out:
4906         return res;
4907 err:
4908         bond_destroy_debugfs();
4909         bond_netlink_fini();
4910 err_link:
4911         unregister_pernet_subsys(&bond_net_ops);
4912         goto out;
4913
4914 }
4915
4916 static void __exit bonding_exit(void)
4917 {
4918         unregister_netdevice_notifier(&bond_netdev_notifier);
4919
4920         bond_destroy_debugfs();
4921
4922         bond_netlink_fini();
4923         unregister_pernet_subsys(&bond_net_ops);
4924
4925 #ifdef CONFIG_NET_POLL_CONTROLLER
4926         /* Make sure we don't have an imbalance on our netpoll blocking */
4927         WARN_ON(atomic_read(&netpoll_block_tx));
4928 #endif
4929 }
4930
4931 module_init(bonding_init);
4932 module_exit(bonding_exit);
4933 MODULE_LICENSE("GPL");
4934 MODULE_VERSION(DRV_VERSION);
4935 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4936 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");