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/switchdev.h>
  81 #include <net/bonding.h>
  82 #include <net/bond_3ad.h>
  83 #include <net/bond_alb.h>
  84
  85 #include "bonding_priv.h"
  86
  87 /*---------------------------- Module parameters ----------------------------*/
  88
  89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  90
  91 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  92 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  93 static int num_peer_notif = 1;
  94 static int miimon;
  95 static int updelay;
  96 static int downdelay;
  97 static int use_carrier  = 1;
  98 static char *mode;
  99 static char *primary;
 100 static char *primary_reselect;
 101 static char *lacp_rate;
 102 static int min_links;
 103 static char *ad_select;
 104 static char *xmit_hash_policy;
 105 static int arp_interval;
 106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 107 static char *arp_validate;
 108 static char *arp_all_targets;
 109 static char *fail_over_mac;
 110 static int all_slaves_active;
 111 static struct bond_params bonding_defaults;
 112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 113 static int packets_per_slave = 1;
 114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 115
 116 module_param(max_bonds, int, 0);
 117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 118 module_param(tx_queues, int, 0);
 119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 120 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 122                                "failover event (alias of num_unsol_na)");
 123 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 125                                "failover event (alias of num_grat_arp)");
 126 module_param(miimon, int, 0);
 127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 128 module_param(updelay, int, 0);
 129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 130 module_param(downdelay, int, 0);
 131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 132                             "in milliseconds");
 133 module_param(use_carrier, int, 0);
 134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 135                               "0 for off, 1 for on (default)");
 136 module_param(mode, charp, 0);
 137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 138                        "1 for active-backup, 2 for balance-xor, "
 139                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 140                        "6 for balance-alb");
 141 module_param(primary, charp, 0);
 142 MODULE_PARM_DESC(primary, "Primary network device to use");
 143 module_param(primary_reselect, charp, 0);
 144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 145                                    "once it comes up; "
 146                                    "0 for always (default), "
 147                                    "1 for only if speed of primary is "
 148                                    "better, "
 149                                    "2 for only on active slave "
 150                                    "failure");
 151 module_param(lacp_rate, charp, 0);
 152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 153                             "0 for slow, 1 for fast");
 154 module_param(ad_select, charp, 0);
 155 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 156                             "0 for stable (default), 1 for bandwidth, "
 157                             "2 for count");
 158 module_param(min_links, int, 0);
 159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 160
 161 module_param(xmit_hash_policy, charp, 0);
 162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 163                                    "0 for layer 2 (default), 1 for layer 3+4, "
 164                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 165                                    "4 for encap layer 3+4");
 166 module_param(arp_interval, int, 0);
 167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 168 module_param_array(arp_ip_target, charp, NULL, 0);
 169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 170 module_param(arp_validate, charp, 0);
 171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 172                                "0 for none (default), 1 for active, "
 173                                "2 for backup, 3 for all");
 174 module_param(arp_all_targets, charp, 0);
 175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 176 module_param(fail_over_mac, charp, 0);
 177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 178                                 "the same MAC; 0 for none (default), "
 179                                 "1 for active, 2 for follow");
 180 module_param(all_slaves_active, int, 0);
 181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 182                                      "by setting active flag for all slaves; "
 183                                      "0 for never (default), 1 for always.");
 184 module_param(resend_igmp, int, 0);
 185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 186                               "link failure");
 187 module_param(packets_per_slave, int, 0);
 188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 189                                     "mode; 0 for a random slave, 1 packet per "
 190                                     "slave (default), >1 packets per slave.");
 191 module_param(lp_interval, uint, 0);
 192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 193                               "the bonding driver sends learning packets to "
 194                               "each slaves peer switch. The default is 1.");
 195
 196 /*----------------------------- Global variables ----------------------------*/
 197
 198 #ifdef CONFIG_NET_POLL_CONTROLLER
 199 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 200 #endif
 201
 202 unsigned int bond_net_id __read_mostly;
 203
 204 /*-------------------------- Forward declarations ---------------------------*/
 205
 206 static int bond_init(struct net_device *bond_dev);
 207 static void bond_uninit(struct net_device *bond_dev);
 208 static void bond_get_stats(struct net_device *bond_dev,
 209                            struct rtnl_link_stats64 *stats);
 210 static void bond_slave_arr_handler(struct work_struct *work);
 211 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 212                                   int mod);
 213 static void bond_netdev_notify_work(struct work_struct *work);
 214
 215 /*---------------------------- General routines -----------------------------*/
 216
 217 const char *bond_mode_name(int mode)
 218 {
 219         static const char *names[] = {
 220                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 221                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 222                 [BOND_MODE_XOR] = "load balancing (xor)",
 223                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 224                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 225                 [BOND_MODE_TLB] = "transmit load balancing",
 226                 [BOND_MODE_ALB] = "adaptive load balancing",
 227         };
 228
 229         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 230                 return "unknown";
 231
 232         return names[mode];
 233 }
 234
 235 /*---------------------------------- VLAN -----------------------------------*/
 236
 237 /**
 238  * bond_dev_queue_xmit - Prepare skb for xmit.
 239  *
 240  * @bond: bond device that got this skb for tx.
 241  * @skb: hw accel VLAN tagged skb to transmit
 242  * @slave_dev: slave that is supposed to xmit this skbuff
 243  */
 244 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 245                         struct net_device *slave_dev)
 246 {
 247         skb->dev = slave_dev;
 248
 249         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 250                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 251         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 252
 253         if (unlikely(netpoll_tx_running(bond->dev)))
 254                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 255         else
 256                 dev_queue_xmit(skb);
 257 }
 258
 259 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 260  * We don't protect the slave list iteration with a lock because:
 261  * a. This operation is performed in IOCTL context,
 262  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 263  * c. Holding a lock with BH disabled while directly calling a base driver
 264  *    entry point is generally a BAD idea.
 265  *
 266  * The design of synchronization/protection for this operation in the 8021q
 267  * module is good for one or more VLAN devices over a single physical device
 268  * and cannot be extended for a teaming solution like bonding, so there is a
 269  * potential race condition here where a net device from the vlan group might
 270  * be referenced (either by a base driver or the 8021q code) while it is being
 271  * removed from the system. However, it turns out we're not making matters
 272  * worse, and if it works for regular VLAN usage it will work here too.
 273 */
 274
 275 /**
 276  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 277  * @bond_dev: bonding net device that got called
 278  * @vid: vlan id being added
 279  */
 280 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 281                                 __be16 proto, u16 vid)
 282 {
 283         struct bonding *bond = netdev_priv(bond_dev);
 284         struct slave *slave, *rollback_slave;
 285         struct list_head *iter;
 286         int res;
 287
 288         bond_for_each_slave(bond, slave, iter) {
 289                 res = vlan_vid_add(slave->dev, proto, vid);
 290                 if (res)
 291                         goto unwind;
 292         }
 293
 294         return 0;
 295
 296 unwind:
 297         /* unwind to the slave that failed */
 298         bond_for_each_slave(bond, rollback_slave, iter) {
 299                 if (rollback_slave == slave)
 300                         break;
 301
 302                 vlan_vid_del(rollback_slave->dev, proto, vid);
 303         }
 304
 305         return res;
 306 }
 307
 308 /**
 309  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 310  * @bond_dev: bonding net device that got called
 311  * @vid: vlan id being removed
 312  */
 313 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 314                                  __be16 proto, u16 vid)
 315 {
 316         struct bonding *bond = netdev_priv(bond_dev);
 317         struct list_head *iter;
 318         struct slave *slave;
 319
 320         bond_for_each_slave(bond, slave, iter)
 321                 vlan_vid_del(slave->dev, proto, vid);
 322
 323         if (bond_is_lb(bond))
 324                 bond_alb_clear_vlan(bond, vid);
 325
 326         return 0;
 327 }
 328
 329 /*------------------------------- Link status -------------------------------*/
 330
 331 /* Set the carrier state for the master according to the state of its
 332  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 333  * do special 802.3ad magic.
 334  *
 335  * Returns zero if carrier state does not change, nonzero if it does.
 336  */
 337 int bond_set_carrier(struct bonding *bond)
 338 {
 339         struct list_head *iter;
 340         struct slave *slave;
 341
 342         if (!bond_has_slaves(bond))
 343                 goto down;
 344
 345         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 346                 return bond_3ad_set_carrier(bond);
 347
 348         bond_for_each_slave(bond, slave, iter) {
 349                 if (slave->link == BOND_LINK_UP) {
 350                         if (!netif_carrier_ok(bond->dev)) {
 351                                 netif_carrier_on(bond->dev);
 352                                 return 1;
 353                         }
 354                         return 0;
 355                 }
 356         }
 357
 358 down:
 359         if (netif_carrier_ok(bond->dev)) {
 360                 netif_carrier_off(bond->dev);
 361                 return 1;
 362         }
 363         return 0;
 364 }
 365
 366 /* Get link speed and duplex from the slave's base driver
 367  * using ethtool. If for some reason the call fails or the
 368  * values are invalid, set speed and duplex to -1,
 369  * and return. Return 1 if speed or duplex settings are
 370  * UNKNOWN; 0 otherwise.
 371  */
 372 static int bond_update_speed_duplex(struct slave *slave)
 373 {
 374         struct net_device *slave_dev = slave->dev;
 375         struct ethtool_link_ksettings ecmd;
 376         int res;
 377
 378         slave->speed = SPEED_UNKNOWN;
 379         slave->duplex = DUPLEX_UNKNOWN;
 380
 381         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 382         if (res < 0)
 383                 return 1;
 384         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 385                 return 1;
 386         switch (ecmd.base.duplex) {
 387         case DUPLEX_FULL:
 388         case DUPLEX_HALF:
 389                 break;
 390         default:
 391                 return 1;
 392         }
 393
 394         slave->speed = ecmd.base.speed;
 395         slave->duplex = ecmd.base.duplex;
 396
 397         return 0;
 398 }
 399
 400 const char *bond_slave_link_status(s8 link)
 401 {
 402         switch (link) {
 403         case BOND_LINK_UP:
 404                 return "up";
 405         case BOND_LINK_FAIL:
 406                 return "going down";
 407         case BOND_LINK_DOWN:
 408                 return "down";
 409         case BOND_LINK_BACK:
 410                 return "going back";
 411         default:
 412                 return "unknown";
 413         }
 414 }
 415
 416 /* if <dev> supports MII link status reporting, check its link status.
 417  *
 418  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 419  * depending upon the setting of the use_carrier parameter.
 420  *
 421  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 422  * can't tell and just pretend it is), or 0, meaning that the link is
 423  * down.
 424  *
 425  * If reporting is non-zero, instead of faking link up, return -1 if
 426  * both ETHTOOL and MII ioctls fail (meaning the device does not
 427  * support them).  If use_carrier is set, return whatever it says.
 428  * It'd be nice if there was a good way to tell if a driver supports
 429  * netif_carrier, but there really isn't.
 430  */
 431 static int bond_check_dev_link(struct bonding *bond,
 432                                struct net_device *slave_dev, int reporting)
 433 {
 434         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 435         int (*ioctl)(struct net_device *, struct ifreq *, int);
 436         struct ifreq ifr;
 437         struct mii_ioctl_data *mii;
 438
 439         if (!reporting && !netif_running(slave_dev))
 440                 return 0;
 441
 442         if (bond->params.use_carrier)
 443                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 444
 445         /* Try to get link status using Ethtool first. */
 446         if (slave_dev->ethtool_ops->get_link)
 447                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 448                         BMSR_LSTATUS : 0;
 449
 450         /* Ethtool can't be used, fallback to MII ioctls. */
 451         ioctl = slave_ops->ndo_do_ioctl;
 452         if (ioctl) {
 453                 /* TODO: set pointer to correct ioctl on a per team member
 454                  *       bases to make this more efficient. that is, once
 455                  *       we determine the correct ioctl, we will always
 456                  *       call it and not the others for that team
 457                  *       member.
 458                  */
 459
 460                 /* We cannot assume that SIOCGMIIPHY will also read a
 461                  * register; not all network drivers (e.g., e100)
 462                  * support that.
 463                  */
 464
 465                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 466                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 467                 mii = if_mii(&ifr);
 468                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 469                         mii->reg_num = MII_BMSR;
 470                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 471                                 return mii->val_out & BMSR_LSTATUS;
 472                 }
 473         }
 474
 475         /* If reporting, report that either there's no dev->do_ioctl,
 476          * or both SIOCGMIIREG and get_link failed (meaning that we
 477          * cannot report link status).  If not reporting, pretend
 478          * we're ok.
 479          */
 480         return reporting ? -1 : BMSR_LSTATUS;
 481 }
 482
 483 /*----------------------------- Multicast list ------------------------------*/
 484
 485 /* Push the promiscuity flag down to appropriate slaves */
 486 static int bond_set_promiscuity(struct bonding *bond, int inc)
 487 {
 488         struct list_head *iter;
 489         int err = 0;
 490
 491         if (bond_uses_primary(bond)) {
 492                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 493
 494                 if (curr_active)
 495                         err = dev_set_promiscuity(curr_active->dev, inc);
 496         } else {
 497                 struct slave *slave;
 498
 499                 bond_for_each_slave(bond, slave, iter) {
 500                         err = dev_set_promiscuity(slave->dev, inc);
 501                         if (err)
 502                                 return err;
 503                 }
 504         }
 505         return err;
 506 }
 507
 508 /* Push the allmulti flag down to all slaves */
 509 static int bond_set_allmulti(struct bonding *bond, int inc)
 510 {
 511         struct list_head *iter;
 512         int err = 0;
 513
 514         if (bond_uses_primary(bond)) {
 515                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 516
 517                 if (curr_active)
 518                         err = dev_set_allmulti(curr_active->dev, inc);
 519         } else {
 520                 struct slave *slave;
 521
 522                 bond_for_each_slave(bond, slave, iter) {
 523                         err = dev_set_allmulti(slave->dev, inc);
 524                         if (err)
 525                                 return err;
 526                 }
 527         }
 528         return err;
 529 }
 530
 531 /* Retrieve the list of registered multicast addresses for the bonding
 532  * device and retransmit an IGMP JOIN request to the current active
 533  * slave.
 534  */
 535 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 536 {
 537         struct bonding *bond = container_of(work, struct bonding,
 538                                             mcast_work.work);
 539
 540         if (!rtnl_trylock()) {
 541                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 542                 return;
 543         }
 544         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 545
 546         if (bond->igmp_retrans > 1) {
 547                 bond->igmp_retrans--;
 548                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 549         }
 550         rtnl_unlock();
 551 }
 552
 553 /* Flush bond's hardware addresses from slave */
 554 static void bond_hw_addr_flush(struct net_device *bond_dev,
 555                                struct net_device *slave_dev)
 556 {
 557         struct bonding *bond = netdev_priv(bond_dev);
 558
 559         dev_uc_unsync(slave_dev, bond_dev);
 560         dev_mc_unsync(slave_dev, bond_dev);
 561
 562         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 563                 /* del lacpdu mc addr from mc list */
 564                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 565
 566                 dev_mc_del(slave_dev, lacpdu_multicast);
 567         }
 568 }
 569
 570 /*--------------------------- Active slave change ---------------------------*/
 571
 572 /* Update the hardware address list and promisc/allmulti for the new and
 573  * old active slaves (if any).  Modes that are not using primary keep all
 574  * slaves up date at all times; only the modes that use primary need to call
 575  * this function to swap these settings during a failover.
 576  */
 577 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 578                               struct slave *old_active)
 579 {
 580         if (old_active) {
 581                 if (bond->dev->flags & IFF_PROMISC)
 582                         dev_set_promiscuity(old_active->dev, -1);
 583
 584                 if (bond->dev->flags & IFF_ALLMULTI)
 585                         dev_set_allmulti(old_active->dev, -1);
 586
 587                 bond_hw_addr_flush(bond->dev, old_active->dev);
 588         }
 589
 590         if (new_active) {
 591                 /* FIXME: Signal errors upstream. */
 592                 if (bond->dev->flags & IFF_PROMISC)
 593                         dev_set_promiscuity(new_active->dev, 1);
 594
 595                 if (bond->dev->flags & IFF_ALLMULTI)
 596                         dev_set_allmulti(new_active->dev, 1);
 597
 598                 netif_addr_lock_bh(bond->dev);
 599                 dev_uc_sync(new_active->dev, bond->dev);
 600                 dev_mc_sync(new_active->dev, bond->dev);
 601                 netif_addr_unlock_bh(bond->dev);
 602         }
 603 }
 604
 605 /**
 606  * bond_set_dev_addr - clone slave's address to bond
 607  * @bond_dev: bond net device
 608  * @slave_dev: slave net device
 609  *
 610  * Should be called with RTNL held.
 611  */
 612 static void bond_set_dev_addr(struct net_device *bond_dev,
 613                               struct net_device *slave_dev)
 614 {
 615         netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n",
 616                    bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len);
 617         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 618         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 619         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 620 }
 621
 622 static struct slave *bond_get_old_active(struct bonding *bond,
 623                                          struct slave *new_active)
 624 {
 625         struct slave *slave;
 626         struct list_head *iter;
 627
 628         bond_for_each_slave(bond, slave, iter) {
 629                 if (slave == new_active)
 630                         continue;
 631
 632                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 633                         return slave;
 634         }
 635
 636         return NULL;
 637 }
 638
 639 /* bond_do_fail_over_mac
 640  *
 641  * Perform special MAC address swapping for fail_over_mac settings
 642  *
 643  * Called with RTNL
 644  */
 645 static void bond_do_fail_over_mac(struct bonding *bond,
 646                                   struct slave *new_active,
 647                                   struct slave *old_active)
 648 {
 649         u8 tmp_mac[MAX_ADDR_LEN];
 650         struct sockaddr_storage ss;
 651         int rv;
 652
 653         switch (bond->params.fail_over_mac) {
 654         case BOND_FOM_ACTIVE:
 655                 if (new_active)
 656                         bond_set_dev_addr(bond->dev, new_active->dev);
 657                 break;
 658         case BOND_FOM_FOLLOW:
 659                 /* if new_active && old_active, swap them
 660                  * if just old_active, do nothing (going to no active slave)
 661                  * if just new_active, set new_active to bond's MAC
 662                  */
 663                 if (!new_active)
 664                         return;
 665
 666                 if (!old_active)
 667                         old_active = bond_get_old_active(bond, new_active);
 668
 669                 if (old_active) {
 670                         bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 671                                           new_active->dev->addr_len);
 672                         bond_hw_addr_copy(ss.__data,
 673                                           old_active->dev->dev_addr,
 674                                           old_active->dev->addr_len);
 675                         ss.ss_family = new_active->dev->type;
 676                 } else {
 677                         bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 678                                           bond->dev->addr_len);
 679                         ss.ss_family = bond->dev->type;
 680                 }
 681
 682                 rv = dev_set_mac_address(new_active->dev,
 683                                          (struct sockaddr *)&ss);
 684                 if (rv) {
 685                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 686                                    -rv, new_active->dev->name);
 687                         goto out;
 688                 }
 689
 690                 if (!old_active)
 691                         goto out;
 692
 693                 bond_hw_addr_copy(ss.__data, tmp_mac,
 694                                   new_active->dev->addr_len);
 695                 ss.ss_family = old_active->dev->type;
 696
 697                 rv = dev_set_mac_address(old_active->dev,
 698                                          (struct sockaddr *)&ss);
 699                 if (rv)
 700                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 701                                    -rv, new_active->dev->name);
 702 out:
 703                 break;
 704         default:
 705                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 706                            bond->params.fail_over_mac);
 707                 break;
 708         }
 709
 710 }
 711
 712 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
 713 {
 714         struct slave *prim = rtnl_dereference(bond->primary_slave);
 715         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 716
 717         if (!prim || prim->link != BOND_LINK_UP) {
 718                 if (!curr || curr->link != BOND_LINK_UP)
 719                         return NULL;
 720                 return curr;
 721         }
 722
 723         if (bond->force_primary) {
 724                 bond->force_primary = false;
 725                 return prim;
 726         }
 727
 728         if (!curr || curr->link != BOND_LINK_UP)
 729                 return prim;
 730
 731         /* At this point, prim and curr are both up */
 732         switch (bond->params.primary_reselect) {
 733         case BOND_PRI_RESELECT_ALWAYS:
 734                 return prim;
 735         case BOND_PRI_RESELECT_BETTER:
 736                 if (prim->speed < curr->speed)
 737                         return curr;
 738                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
 739                         return curr;
 740                 return prim;
 741         case BOND_PRI_RESELECT_FAILURE:
 742                 return curr;
 743         default:
 744                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
 745                            bond->params.primary_reselect);
 746                 return curr;
 747         }
 748 }
 749
 750 /**
 751  * bond_find_best_slave - select the best available slave to be the active one
 752  * @bond: our bonding struct
 753  */
 754 static struct slave *bond_find_best_slave(struct bonding *bond)
 755 {
 756         struct slave *slave, *bestslave = NULL;
 757         struct list_head *iter;
 758         int mintime = bond->params.updelay;
 759
 760         slave = bond_choose_primary_or_current(bond);
 761         if (slave)
 762                 return slave;
 763
 764         bond_for_each_slave(bond, slave, iter) {
 765                 if (slave->link == BOND_LINK_UP)
 766                         return slave;
 767                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 768                     slave->delay < mintime) {
 769                         mintime = slave->delay;
 770                         bestslave = slave;
 771                 }
 772         }
 773
 774         return bestslave;
 775 }
 776
 777 static bool bond_should_notify_peers(struct bonding *bond)
 778 {
 779         struct slave *slave;
 780
 781         rcu_read_lock();
 782         slave = rcu_dereference(bond->curr_active_slave);
 783         rcu_read_unlock();
 784
 785         if (!slave || !bond->send_peer_notif ||
 786             !netif_carrier_ok(bond->dev) ||
 787             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 788                 return false;
 789
 790         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 791                    slave ? slave->dev->name : "NULL");
 792
 793         return true;
 794 }
 795
 796 /**
 797  * change_active_interface - change the active slave into the specified one
 798  * @bond: our bonding struct
 799  * @new: the new slave to make the active one
 800  *
 801  * Set the new slave to the bond's settings and unset them on the old
 802  * curr_active_slave.
 803  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 804  *
 805  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 806  * because it is apparently the best available slave we have, even though its
 807  * updelay hasn't timed out yet.
 808  *
 809  * Caller must hold RTNL.
 810  */
 811 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 812 {
 813         struct slave *old_active;
 814
 815         ASSERT_RTNL();
 816
 817         old_active = rtnl_dereference(bond->curr_active_slave);
 818
 819         if (old_active == new_active)
 820                 return;
 821
 822         if (new_active) {
 823                 new_active->last_link_up = jiffies;
 824
 825                 if (new_active->link == BOND_LINK_BACK) {
 826                         if (bond_uses_primary(bond)) {
 827                                 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
 828                                             new_active->dev->name,
 829                                             (bond->params.updelay - new_active->delay) * bond->params.miimon);
 830                         }
 831
 832                         new_active->delay = 0;
 833                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
 834                                                   BOND_SLAVE_NOTIFY_NOW);
 835
 836                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 837                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 838
 839                         if (bond_is_lb(bond))
 840                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 841                 } else {
 842                         if (bond_uses_primary(bond)) {
 843                                 netdev_info(bond->dev, "making interface %s the new active one\n",
 844                                             new_active->dev->name);
 845                         }
 846                 }
 847         }
 848
 849         if (bond_uses_primary(bond))
 850                 bond_hw_addr_swap(bond, new_active, old_active);
 851
 852         if (bond_is_lb(bond)) {
 853                 bond_alb_handle_active_change(bond, new_active);
 854                 if (old_active)
 855                         bond_set_slave_inactive_flags(old_active,
 856                                                       BOND_SLAVE_NOTIFY_NOW);
 857                 if (new_active)
 858                         bond_set_slave_active_flags(new_active,
 859                                                     BOND_SLAVE_NOTIFY_NOW);
 860         } else {
 861                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 862         }
 863
 864         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
 865                 if (old_active)
 866                         bond_set_slave_inactive_flags(old_active,
 867                                                       BOND_SLAVE_NOTIFY_NOW);
 868
 869                 if (new_active) {
 870                         bool should_notify_peers = false;
 871
 872                         bond_set_slave_active_flags(new_active,
 873                                                     BOND_SLAVE_NOTIFY_NOW);
 874
 875                         if (bond->params.fail_over_mac)
 876                                 bond_do_fail_over_mac(bond, new_active,
 877                                                       old_active);
 878
 879                         if (netif_running(bond->dev)) {
 880                                 bond->send_peer_notif =
 881                                         bond->params.num_peer_notif;
 882                                 should_notify_peers =
 883                                         bond_should_notify_peers(bond);
 884                         }
 885
 886                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 887                         if (should_notify_peers)
 888                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 889                                                          bond->dev);
 890                 }
 891         }
 892
 893         /* resend IGMP joins since active slave has changed or
 894          * all were sent on curr_active_slave.
 895          * resend only if bond is brought up with the affected
 896          * bonding modes and the retransmission is enabled
 897          */
 898         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 899             ((bond_uses_primary(bond) && new_active) ||
 900              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
 901                 bond->igmp_retrans = bond->params.resend_igmp;
 902                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 903         }
 904 }
 905
 906 /**
 907  * bond_select_active_slave - select a new active slave, if needed
 908  * @bond: our bonding struct
 909  *
 910  * This functions should be called when one of the following occurs:
 911  * - The old curr_active_slave has been released or lost its link.
 912  * - The primary_slave has got its link back.
 913  * - A slave has got its link back and there's no old curr_active_slave.
 914  *
 915  * Caller must hold RTNL.
 916  */
 917 void bond_select_active_slave(struct bonding *bond)
 918 {
 919         struct slave *best_slave;
 920         int rv;
 921
 922         ASSERT_RTNL();
 923
 924         best_slave = bond_find_best_slave(bond);
 925         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
 926                 bond_change_active_slave(bond, best_slave);
 927                 rv = bond_set_carrier(bond);
 928                 if (!rv)
 929                         return;
 930
 931                 if (netif_carrier_ok(bond->dev))
 932                         netdev_info(bond->dev, "first active interface up!\n");
 933                 else
 934                         netdev_info(bond->dev, "now running without any active interface!\n");
 935         }
 936 }
 937
 938 #ifdef CONFIG_NET_POLL_CONTROLLER
 939 static inline int slave_enable_netpoll(struct slave *slave)
 940 {
 941         struct netpoll *np;
 942         int err = 0;
 943
 944         np = kzalloc(sizeof(*np), GFP_KERNEL);
 945         err = -ENOMEM;
 946         if (!np)
 947                 goto out;
 948
 949         err = __netpoll_setup(np, slave->dev);
 950         if (err) {
 951                 kfree(np);
 952                 goto out;
 953         }
 954         slave->np = np;
 955 out:
 956         return err;
 957 }
 958 static inline void slave_disable_netpoll(struct slave *slave)
 959 {
 960         struct netpoll *np = slave->np;
 961
 962         if (!np)
 963                 return;
 964
 965         slave->np = NULL;
 966         __netpoll_free_async(np);
 967 }
 968
 969 static void bond_poll_controller(struct net_device *bond_dev)
 970 {
 971         struct bonding *bond = netdev_priv(bond_dev);
 972         struct slave *slave = NULL;
 973         struct list_head *iter;
 974         struct ad_info ad_info;
 975         struct netpoll_info *ni;
 976         const struct net_device_ops *ops;
 977
 978         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 979                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
 980                         return;
 981
 982         bond_for_each_slave_rcu(bond, slave, iter) {
 983                 ops = slave->dev->netdev_ops;
 984                 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
 985                         continue;
 986
 987                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 988                         struct aggregator *agg =
 989                             SLAVE_AD_INFO(slave)->port.aggregator;
 990
 991                         if (agg &&
 992                             agg->aggregator_identifier != ad_info.aggregator_id)
 993                                 continue;
 994                 }
 995
 996                 ni = rcu_dereference_bh(slave->dev->npinfo);
 997                 if (down_trylock(&ni->dev_lock))
 998                         continue;
 999                 ops->ndo_poll_controller(slave->dev);
1000                 up(&ni->dev_lock);
1001         }
1002 }
1003
1004 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1005 {
1006         struct bonding *bond = netdev_priv(bond_dev);
1007         struct list_head *iter;
1008         struct slave *slave;
1009
1010         bond_for_each_slave(bond, slave, iter)
1011                 if (bond_slave_is_up(slave))
1012                         slave_disable_netpoll(slave);
1013 }
1014
1015 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1016 {
1017         struct bonding *bond = netdev_priv(dev);
1018         struct list_head *iter;
1019         struct slave *slave;
1020         int err = 0;
1021
1022         bond_for_each_slave(bond, slave, iter) {
1023                 err = slave_enable_netpoll(slave);
1024                 if (err) {
1025                         bond_netpoll_cleanup(dev);
1026                         break;
1027                 }
1028         }
1029         return err;
1030 }
1031 #else
1032 static inline int slave_enable_netpoll(struct slave *slave)
1033 {
1034         return 0;
1035 }
1036 static inline void slave_disable_netpoll(struct slave *slave)
1037 {
1038 }
1039 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1040 {
1041 }
1042 #endif
1043
1044 /*---------------------------------- IOCTL ----------------------------------*/
1045
1046 static netdev_features_t bond_fix_features(struct net_device *dev,
1047                                            netdev_features_t features)
1048 {
1049         struct bonding *bond = netdev_priv(dev);
1050         struct list_head *iter;
1051         netdev_features_t mask;
1052         struct slave *slave;
1053
1054         mask = features;
1055
1056         features &= ~NETIF_F_ONE_FOR_ALL;
1057         features |= NETIF_F_ALL_FOR_ALL;
1058
1059         bond_for_each_slave(bond, slave, iter) {
1060                 features = netdev_increment_features(features,
1061                                                      slave->dev->features,
1062                                                      mask);
1063         }
1064         features = netdev_add_tso_features(features, mask);
1065
1066         return features;
1067 }
1068
1069 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1070                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1071                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1072
1073 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1074                                  NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1075
1076 static void bond_compute_features(struct bonding *bond)
1077 {
1078         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1079                                         IFF_XMIT_DST_RELEASE_PERM;
1080         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1081         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1082         struct net_device *bond_dev = bond->dev;
1083         struct list_head *iter;
1084         struct slave *slave;
1085         unsigned short max_hard_header_len = ETH_HLEN;
1086         unsigned int gso_max_size = GSO_MAX_SIZE;
1087         u16 gso_max_segs = GSO_MAX_SEGS;
1088
1089         if (!bond_has_slaves(bond))
1090                 goto done;
1091         vlan_features &= NETIF_F_ALL_FOR_ALL;
1092
1093         bond_for_each_slave(bond, slave, iter) {
1094                 vlan_features = netdev_increment_features(vlan_features,
1095                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1096
1097                 enc_features = netdev_increment_features(enc_features,
1098                                                          slave->dev->hw_enc_features,
1099                                                          BOND_ENC_FEATURES);
1100                 dst_release_flag &= slave->dev->priv_flags;
1101                 if (slave->dev->hard_header_len > max_hard_header_len)
1102                         max_hard_header_len = slave->dev->hard_header_len;
1103
1104                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1105                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1106         }
1107         bond_dev->hard_header_len = max_hard_header_len;
1108
1109 done:
1110         bond_dev->vlan_features = vlan_features;
1111         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1112                                     NETIF_F_HW_VLAN_CTAG_TX |
1113                                     NETIF_F_HW_VLAN_STAG_TX;
1114         bond_dev->gso_max_segs = gso_max_segs;
1115         netif_set_gso_max_size(bond_dev, gso_max_size);
1116
1117         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1118         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1119             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1120                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1121
1122         netdev_change_features(bond_dev);
1123 }
1124
1125 static void bond_setup_by_slave(struct net_device *bond_dev,
1126                                 struct net_device *slave_dev)
1127 {
1128         bond_dev->header_ops        = slave_dev->header_ops;
1129
1130         bond_dev->type              = slave_dev->type;
1131         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1132         bond_dev->needed_headroom   = slave_dev->needed_headroom;
1133         bond_dev->addr_len          = slave_dev->addr_len;
1134
1135         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1136                 slave_dev->addr_len);
1137 }
1138
1139 /* On bonding slaves other than the currently active slave, suppress
1140  * duplicates except for alb non-mcast/bcast.
1141  */
1142 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1143                                             struct slave *slave,
1144                                             struct bonding *bond)
1145 {
1146         if (bond_is_slave_inactive(slave)) {
1147                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1148                     skb->pkt_type != PACKET_BROADCAST &&
1149                     skb->pkt_type != PACKET_MULTICAST)
1150                         return false;
1151                 return true;
1152         }
1153         return false;
1154 }
1155
1156 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1157 {
1158         struct sk_buff *skb = *pskb;
1159         struct slave *slave;
1160         struct bonding *bond;
1161         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1162                           struct slave *);
1163         int ret = RX_HANDLER_ANOTHER;
1164
1165         skb = skb_share_check(skb, GFP_ATOMIC);
1166         if (unlikely(!skb))
1167                 return RX_HANDLER_CONSUMED;
1168
1169         *pskb = skb;
1170
1171         slave = bond_slave_get_rcu(skb->dev);
1172         bond = slave->bond;
1173
1174         recv_probe = ACCESS_ONCE(bond->recv_probe);
1175         if (recv_probe) {
1176                 ret = recv_probe(skb, bond, slave);
1177                 if (ret == RX_HANDLER_CONSUMED) {
1178                         consume_skb(skb);
1179                         return ret;
1180                 }
1181         }
1182
1183         /*
1184          * For packets determined by bond_should_deliver_exact_match() call to
1185          * be suppressed we want to make an exception for link-local packets.
1186          * This is necessary for e.g. LLDP daemons to be able to monitor
1187          * inactive slave links without being forced to bind to them
1188          * explicitly.
1189          *
1190          * At the same time, packets that are passed to the bonding master
1191          * (including link-local ones) can have their originating interface
1192          * determined via PACKET_ORIGDEV socket option.
1193          */
1194         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1195                 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1196                         return RX_HANDLER_PASS;
1197                 return RX_HANDLER_EXACT;
1198         }
1199
1200         skb->dev = bond->dev;
1201
1202         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1203             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1204             skb->pkt_type == PACKET_HOST) {
1205
1206                 if (unlikely(skb_cow_head(skb,
1207                                           skb->data - skb_mac_header(skb)))) {
1208                         kfree_skb(skb);
1209                         return RX_HANDLER_CONSUMED;
1210                 }
1211                 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1212                                   bond->dev->addr_len);
1213         }
1214
1215         return ret;
1216 }
1217
1218 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1219 {
1220         switch (BOND_MODE(bond)) {
1221         case BOND_MODE_ROUNDROBIN:
1222                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1223         case BOND_MODE_ACTIVEBACKUP:
1224                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1225         case BOND_MODE_BROADCAST:
1226                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1227         case BOND_MODE_XOR:
1228         case BOND_MODE_8023AD:
1229                 return NETDEV_LAG_TX_TYPE_HASH;
1230         default:
1231                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1232         }
1233 }
1234
1235 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave)
1236 {
1237         struct netdev_lag_upper_info lag_upper_info;
1238         int err;
1239
1240         lag_upper_info.tx_type = bond_lag_tx_type(bond);
1241         err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1242                                            &lag_upper_info);
1243         if (err)
1244                 return err;
1245         rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1246         return 0;
1247 }
1248
1249 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1250 {
1251         netdev_upper_dev_unlink(slave->dev, bond->dev);
1252         slave->dev->flags &= ~IFF_SLAVE;
1253         rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1254 }
1255
1256 static void slave_kobj_release(struct kobject *kobj)
1257 {
1258         struct slave *slave = to_slave(kobj);
1259         struct bonding *bond = bond_get_bond_by_slave(slave);
1260
1261         cancel_delayed_work_sync(&slave->notify_work);
1262         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1263                 kfree(SLAVE_AD_INFO(slave));
1264
1265         kfree(slave);
1266 }
1267
1268 static struct kobj_type slave_ktype = {
1269         .release = slave_kobj_release,
1270 #ifdef CONFIG_SYSFS
1271         .sysfs_ops = &slave_sysfs_ops,
1272 #endif
1273 };
1274
1275 static int bond_kobj_init(struct slave *slave)
1276 {
1277         int err;
1278
1279         err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1280                                    &(slave->dev->dev.kobj), "bonding_slave");
1281         if (err)
1282                 kobject_put(&slave->kobj);
1283
1284         return err;
1285 }
1286
1287 static struct slave *bond_alloc_slave(struct bonding *bond,
1288                                       struct net_device *slave_dev)
1289 {
1290         struct slave *slave = NULL;
1291
1292         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1293         if (!slave)
1294                 return NULL;
1295
1296         slave->bond = bond;
1297         slave->dev = slave_dev;
1298         INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1299
1300         if (bond_kobj_init(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                         kobject_put(&slave->kobj);
1308                         return NULL;
1309                 }
1310         }
1311
1312         return slave;
1313 }
1314
1315 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1316 {
1317         info->bond_mode = BOND_MODE(bond);
1318         info->miimon = bond->params.miimon;
1319         info->num_slaves = bond->slave_cnt;
1320 }
1321
1322 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1323 {
1324         strcpy(info->slave_name, slave->dev->name);
1325         info->link = slave->link;
1326         info->state = bond_slave_state(slave);
1327         info->link_failure_count = slave->link_failure_count;
1328 }
1329
1330 static void bond_netdev_notify_work(struct work_struct *_work)
1331 {
1332         struct slave *slave = container_of(_work, struct slave,
1333                                            notify_work.work);
1334
1335         if (rtnl_trylock()) {
1336                 struct netdev_bonding_info binfo;
1337
1338                 bond_fill_ifslave(slave, &binfo.slave);
1339                 bond_fill_ifbond(slave->bond, &binfo.master);
1340                 netdev_bonding_info_change(slave->dev, &binfo);
1341                 rtnl_unlock();
1342         } else {
1343                 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1344         }
1345 }
1346
1347 void bond_queue_slave_event(struct slave *slave)
1348 {
1349         queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1350 }
1351
1352 void bond_lower_state_changed(struct slave *slave)
1353 {
1354         struct netdev_lag_lower_state_info info;
1355
1356         info.link_up = slave->link == BOND_LINK_UP ||
1357                        slave->link == BOND_LINK_FAIL;
1358         info.tx_enabled = bond_is_active_slave(slave);
1359         netdev_lower_state_changed(slave->dev, &info);
1360 }
1361
1362 /* enslave device <slave> to bond device <master> */
1363 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1364 {
1365         struct bonding *bond = netdev_priv(bond_dev);
1366         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1367         struct slave *new_slave = NULL, *prev_slave;
1368         struct sockaddr_storage ss;
1369         int link_reporting;
1370         int res = 0, i;
1371
1372         if (!bond->params.use_carrier &&
1373             slave_dev->ethtool_ops->get_link == NULL &&
1374             slave_ops->ndo_do_ioctl == NULL) {
1375                 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1376                             slave_dev->name);
1377         }
1378
1379         /* already in-use? */
1380         if (netdev_is_rx_handler_busy(slave_dev)) {
1381                 netdev_err(bond_dev,
1382                            "Error: Device is in use and cannot be enslaved\n");
1383                 return -EBUSY;
1384         }
1385
1386         if (bond_dev == slave_dev) {
1387                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1388                 return -EPERM;
1389         }
1390
1391         /* vlan challenged mutual exclusion */
1392         /* no need to lock since we're protected by rtnl_lock */
1393         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1394                 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1395                            slave_dev->name);
1396                 if (vlan_uses_dev(bond_dev)) {
1397                         netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1398                                    slave_dev->name, bond_dev->name);
1399                         return -EPERM;
1400                 } else {
1401                         netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1402                                     slave_dev->name, slave_dev->name,
1403                                     bond_dev->name);
1404                 }
1405         } else {
1406                 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1407                            slave_dev->name);
1408         }
1409
1410         /* Old ifenslave binaries are no longer supported.  These can
1411          * be identified with moderate accuracy by the state of the slave:
1412          * the current ifenslave will set the interface down prior to
1413          * enslaving it; the old ifenslave will not.
1414          */
1415         if (slave_dev->flags & IFF_UP) {
1416                 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1417                            slave_dev->name);
1418                 return -EPERM;
1419         }
1420
1421         /* set bonding device ether type by slave - bonding netdevices are
1422          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1423          * there is a need to override some of the type dependent attribs/funcs.
1424          *
1425          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1426          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1427          */
1428         if (!bond_has_slaves(bond)) {
1429                 if (bond_dev->type != slave_dev->type) {
1430                         netdev_dbg(bond_dev, "change device type from %d to %d\n",
1431                                    bond_dev->type, slave_dev->type);
1432
1433                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1434                                                        bond_dev);
1435                         res = notifier_to_errno(res);
1436                         if (res) {
1437                                 netdev_err(bond_dev, "refused to change device type\n");
1438                                 return -EBUSY;
1439                         }
1440
1441                         /* Flush unicast and multicast addresses */
1442                         dev_uc_flush(bond_dev);
1443                         dev_mc_flush(bond_dev);
1444
1445                         if (slave_dev->type != ARPHRD_ETHER)
1446                                 bond_setup_by_slave(bond_dev, slave_dev);
1447                         else {
1448                                 ether_setup(bond_dev);
1449                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1450                         }
1451
1452                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1453                                                  bond_dev);
1454                 }
1455         } else if (bond_dev->type != slave_dev->type) {
1456                 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1457                            slave_dev->name, slave_dev->type, bond_dev->type);
1458                 return -EINVAL;
1459         }
1460
1461         if (slave_dev->type == ARPHRD_INFINIBAND &&
1462             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1463                 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n",
1464                             slave_dev->type);
1465                 res = -EOPNOTSUPP;
1466                 goto err_undo_flags;
1467         }
1468
1469         if (!slave_ops->ndo_set_mac_address ||
1470             slave_dev->type == ARPHRD_INFINIBAND) {
1471                 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1472                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1473                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1474                         if (!bond_has_slaves(bond)) {
1475                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1476                                 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1477                         } else {
1478                                 netdev_err(bond_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1479                                 res = -EOPNOTSUPP;
1480                                 goto err_undo_flags;
1481                         }
1482                 }
1483         }
1484
1485         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1486
1487         /* If this is the first slave, then we need to set the master's hardware
1488          * address to be the same as the slave's.
1489          */
1490         if (!bond_has_slaves(bond) &&
1491             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1492                 bond_set_dev_addr(bond->dev, slave_dev);
1493
1494         new_slave = bond_alloc_slave(bond, slave_dev);
1495         if (!new_slave) {
1496                 res = -ENOMEM;
1497                 goto err_undo_flags;
1498         }
1499
1500         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1501          * is set via sysfs or module option if desired.
1502          */
1503         new_slave->queue_id = 0;
1504
1505         /* Save slave's original mtu and then set it to match the bond */
1506         new_slave->original_mtu = slave_dev->mtu;
1507         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1508         if (res) {
1509                 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1510                 goto err_free;
1511         }
1512
1513         /* Save slave's original ("permanent") mac address for modes
1514          * that need it, and for restoring it upon release, and then
1515          * set it to the master's address
1516          */
1517         bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1518                           slave_dev->addr_len);
1519
1520         if (!bond->params.fail_over_mac ||
1521             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1522                 /* Set slave to master's mac address.  The application already
1523                  * set the master's mac address to that of the first slave
1524                  */
1525                 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1526                 ss.ss_family = slave_dev->type;
1527                 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
1528                 if (res) {
1529                         netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1530                         goto err_restore_mtu;
1531                 }
1532         }
1533
1534         /* set slave flag before open to prevent IPv6 addrconf */
1535         slave_dev->flags |= IFF_SLAVE;
1536
1537         /* open the slave since the application closed it */
1538         res = dev_open(slave_dev);
1539         if (res) {
1540                 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1541                 goto err_restore_mac;
1542         }
1543
1544         slave_dev->priv_flags |= IFF_BONDING;
1545         /* initialize slave stats */
1546         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1547
1548         if (bond_is_lb(bond)) {
1549                 /* bond_alb_init_slave() must be called before all other stages since
1550                  * it might fail and we do not want to have to undo everything
1551                  */
1552                 res = bond_alb_init_slave(bond, new_slave);
1553                 if (res)
1554                         goto err_close;
1555         }
1556
1557         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1558         if (res) {
1559                 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1560                            slave_dev->name);
1561                 goto err_hwaddr_unsync;
1562         }
1563
1564         prev_slave = bond_last_slave(bond);
1565
1566         new_slave->delay = 0;
1567         new_slave->link_failure_count = 0;
1568
1569         if (bond_update_speed_duplex(new_slave) &&
1570             bond_needs_speed_duplex(bond))
1571                 new_slave->link = BOND_LINK_DOWN;
1572
1573         new_slave->last_rx = jiffies -
1574                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1575         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1576                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1577
1578         if (bond->params.miimon && !bond->params.use_carrier) {
1579                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1580
1581                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1582                         /* miimon is set but a bonded network driver
1583                          * does not support ETHTOOL/MII and
1584                          * arp_interval is not set.  Note: if
1585                          * use_carrier is enabled, we will never go
1586                          * here (because netif_carrier is always
1587                          * supported); thus, we don't need to change
1588                          * the messages for netif_carrier.
1589                          */
1590                         netdev_warn(bond_dev, "MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n",
1591                                     slave_dev->name);
1592                 } else if (link_reporting == -1) {
1593                         /* unable get link status using mii/ethtool */
1594                         netdev_warn(bond_dev, "can't get link status from interface %s; 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",
1595                                     slave_dev->name);
1596                 }
1597         }
1598
1599         /* check for initial state */
1600         new_slave->link = BOND_LINK_NOCHANGE;
1601         if (bond->params.miimon) {
1602                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1603                         if (bond->params.updelay) {
1604                                 bond_set_slave_link_state(new_slave,
1605                                                           BOND_LINK_BACK,
1606                                                           BOND_SLAVE_NOTIFY_NOW);
1607                                 new_slave->delay = bond->params.updelay;
1608                         } else {
1609                                 bond_set_slave_link_state(new_slave,
1610                                                           BOND_LINK_UP,
1611                                                           BOND_SLAVE_NOTIFY_NOW);
1612                         }
1613                 } else {
1614                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1615                                                   BOND_SLAVE_NOTIFY_NOW);
1616                 }
1617         } else if (bond->params.arp_interval) {
1618                 bond_set_slave_link_state(new_slave,
1619                                           (netif_carrier_ok(slave_dev) ?
1620                                           BOND_LINK_UP : BOND_LINK_DOWN),
1621                                           BOND_SLAVE_NOTIFY_NOW);
1622         } else {
1623                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1624                                           BOND_SLAVE_NOTIFY_NOW);
1625         }
1626
1627         if (new_slave->link != BOND_LINK_DOWN)
1628                 new_slave->last_link_up = jiffies;
1629         netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1630                    new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1631                    (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1632
1633         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1634                 /* if there is a primary slave, remember it */
1635                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1636                         rcu_assign_pointer(bond->primary_slave, new_slave);
1637                         bond->force_primary = true;
1638                 }
1639         }
1640
1641         switch (BOND_MODE(bond)) {
1642         case BOND_MODE_ACTIVEBACKUP:
1643                 bond_set_slave_inactive_flags(new_slave,
1644                                               BOND_SLAVE_NOTIFY_NOW);
1645                 break;
1646         case BOND_MODE_8023AD:
1647                 /* in 802.3ad mode, the internal mechanism
1648                  * will activate the slaves in the selected
1649                  * aggregator
1650                  */
1651                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1652                 /* if this is the first slave */
1653                 if (!prev_slave) {
1654                         SLAVE_AD_INFO(new_slave)->id = 1;
1655                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1656                          * can be called only after the mac address of the bond is set
1657                          */
1658                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1659                 } else {
1660                         SLAVE_AD_INFO(new_slave)->id =
1661                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1662                 }
1663
1664                 bond_3ad_bind_slave(new_slave);
1665                 break;
1666         case BOND_MODE_TLB:
1667         case BOND_MODE_ALB:
1668                 bond_set_active_slave(new_slave);
1669                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1670                 break;
1671         default:
1672                 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1673
1674                 /* always active in trunk mode */
1675                 bond_set_active_slave(new_slave);
1676
1677                 /* In trunking mode there is little meaning to curr_active_slave
1678                  * anyway (it holds no special properties of the bond device),
1679                  * so we can change it without calling change_active_interface()
1680                  */
1681                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1682                     new_slave->link == BOND_LINK_UP)
1683                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1684
1685                 break;
1686         } /* switch(bond_mode) */
1687
1688 #ifdef CONFIG_NET_POLL_CONTROLLER
1689         if (bond->dev->npinfo) {
1690                 if (slave_enable_netpoll(new_slave)) {
1691                         netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1692                         res = -EBUSY;
1693                         goto err_detach;
1694                 }
1695         }
1696 #endif
1697
1698         if (!(bond_dev->features & NETIF_F_LRO))
1699                 dev_disable_lro(slave_dev);
1700
1701         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1702                                          new_slave);
1703         if (res) {
1704                 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1705                 goto err_detach;
1706         }
1707
1708         res = bond_master_upper_dev_link(bond, new_slave);
1709         if (res) {
1710                 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1711                 goto err_unregister;
1712         }
1713
1714         res = bond_sysfs_slave_add(new_slave);
1715         if (res) {
1716                 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1717                 goto err_upper_unlink;
1718         }
1719
1720         bond->nest_level = dev_get_nest_level(bond_dev) + 1;
1721
1722         /* If the mode uses primary, then the following is handled by
1723          * bond_change_active_slave().
1724          */
1725         if (!bond_uses_primary(bond)) {
1726                 /* set promiscuity level to new slave */
1727                 if (bond_dev->flags & IFF_PROMISC) {
1728                         res = dev_set_promiscuity(slave_dev, 1);
1729                         if (res)
1730                                 goto err_sysfs_del;
1731                 }
1732
1733                 /* set allmulti level to new slave */
1734                 if (bond_dev->flags & IFF_ALLMULTI) {
1735                         res = dev_set_allmulti(slave_dev, 1);
1736                         if (res) {
1737                                 if (bond_dev->flags & IFF_PROMISC)
1738                                         dev_set_promiscuity(slave_dev, -1);
1739                                 goto err_sysfs_del;
1740                         }
1741                 }
1742
1743                 netif_addr_lock_bh(bond_dev);
1744                 dev_mc_sync_multiple(slave_dev, bond_dev);
1745                 dev_uc_sync_multiple(slave_dev, bond_dev);
1746                 netif_addr_unlock_bh(bond_dev);
1747
1748                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1749                         /* add lacpdu mc addr to mc list */
1750                         u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1751
1752                         dev_mc_add(slave_dev, lacpdu_multicast);
1753                 }
1754         }
1755
1756         bond->slave_cnt++;
1757         bond_compute_features(bond);
1758         bond_set_carrier(bond);
1759
1760         if (bond_uses_primary(bond)) {
1761                 block_netpoll_tx();
1762                 bond_select_active_slave(bond);
1763                 unblock_netpoll_tx();
1764         }
1765
1766         if (bond_mode_uses_xmit_hash(bond))
1767                 bond_update_slave_arr(bond, NULL);
1768
1769
1770         netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1771                     slave_dev->name,
1772                     bond_is_active_slave(new_slave) ? "an active" : "a backup",
1773                     new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1774
1775         /* enslave is successful */
1776         bond_queue_slave_event(new_slave);
1777         return 0;
1778
1779 /* Undo stages on error */
1780 err_sysfs_del:
1781         bond_sysfs_slave_del(new_slave);
1782
1783 err_upper_unlink:
1784         bond_upper_dev_unlink(bond, new_slave);
1785
1786 err_unregister:
1787         netdev_rx_handler_unregister(slave_dev);
1788
1789 err_detach:
1790         vlan_vids_del_by_dev(slave_dev, bond_dev);
1791         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1792                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1793         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1794                 block_netpoll_tx();
1795                 bond_change_active_slave(bond, NULL);
1796                 bond_select_active_slave(bond);
1797                 unblock_netpoll_tx();
1798         }
1799         /* either primary_slave or curr_active_slave might've changed */
1800         synchronize_rcu();
1801         slave_disable_netpoll(new_slave);
1802
1803 err_hwaddr_unsync:
1804         if (!bond_uses_primary(bond))
1805                 bond_hw_addr_flush(bond_dev, slave_dev);
1806
1807 err_close:
1808         if (!netif_is_bond_master(slave_dev))
1809                 slave_dev->priv_flags &= ~IFF_BONDING;
1810         dev_close(slave_dev);
1811
1812 err_restore_mac:
1813         slave_dev->flags &= ~IFF_SLAVE;
1814         if (!bond->params.fail_over_mac ||
1815             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1816                 /* XXX TODO - fom follow mode needs to change master's
1817                  * MAC if this slave's MAC is in use by the bond, or at
1818                  * least print a warning.
1819                  */
1820                 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
1821                                   new_slave->dev->addr_len);
1822                 ss.ss_family = slave_dev->type;
1823                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
1824         }
1825
1826 err_restore_mtu:
1827         dev_set_mtu(slave_dev, new_slave->original_mtu);
1828
1829 err_free:
1830         kobject_put(&new_slave->kobj);
1831
1832 err_undo_flags:
1833         /* Enslave of first slave has failed and we need to fix master's mac */
1834         if (!bond_has_slaves(bond)) {
1835                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1836                                             slave_dev->dev_addr))
1837                         eth_hw_addr_random(bond_dev);
1838                 if (bond_dev->type != ARPHRD_ETHER) {
1839                         dev_close(bond_dev);
1840                         ether_setup(bond_dev);
1841                         bond_dev->flags |= IFF_MASTER;
1842                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1843                 }
1844         }
1845
1846         return res;
1847 }
1848
1849 /* Try to release the slave device <slave> from the bond device <master>
1850  * It is legal to access curr_active_slave without a lock because all the function
1851  * is RTNL-locked. If "all" is true it means that the function is being called
1852  * while destroying a bond interface and all slaves are being released.
1853  *
1854  * The rules for slave state should be:
1855  *   for Active/Backup:
1856  *     Active stays on all backups go down
1857  *   for Bonded connections:
1858  *     The first up interface should be left on and all others downed.
1859  */
1860 static int __bond_release_one(struct net_device *bond_dev,
1861                               struct net_device *slave_dev,
1862                               bool all, bool unregister)
1863 {
1864         struct bonding *bond = netdev_priv(bond_dev);
1865         struct slave *slave, *oldcurrent;
1866         struct sockaddr_storage ss;
1867         int old_flags = bond_dev->flags;
1868         netdev_features_t old_features = bond_dev->features;
1869
1870         /* slave is not a slave or master is not master of this slave */
1871         if (!(slave_dev->flags & IFF_SLAVE) ||
1872             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1873                 netdev_dbg(bond_dev, "cannot release %s\n",
1874                            slave_dev->name);
1875                 return -EINVAL;
1876         }
1877
1878         block_netpoll_tx();
1879
1880         slave = bond_get_slave_by_dev(bond, slave_dev);
1881         if (!slave) {
1882                 /* not a slave of this bond */
1883                 netdev_info(bond_dev, "%s not enslaved\n",
1884                             slave_dev->name);
1885                 unblock_netpoll_tx();
1886                 return -EINVAL;
1887         }
1888
1889         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1890
1891         bond_sysfs_slave_del(slave);
1892
1893         /* recompute stats just before removing the slave */
1894         bond_get_stats(bond->dev, &bond->bond_stats);
1895
1896         bond_upper_dev_unlink(bond, slave);
1897         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1898          * for this slave anymore.
1899          */
1900         netdev_rx_handler_unregister(slave_dev);
1901
1902         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1903                 bond_3ad_unbind_slave(slave);
1904
1905         if (bond_mode_uses_xmit_hash(bond))
1906                 bond_update_slave_arr(bond, slave);
1907
1908         netdev_info(bond_dev, "Releasing %s interface %s\n",
1909                     bond_is_active_slave(slave) ? "active" : "backup",
1910                     slave_dev->name);
1911
1912         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1913
1914         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1915
1916         if (!all && (!bond->params.fail_over_mac ||
1917                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1918                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1919                     bond_has_slaves(bond))
1920                         netdev_warn(bond_dev, "the permanent HWaddr of %s - %pM - is still in use by %s - set the HWaddr of %s to a different address to avoid conflicts\n",
1921                                     slave_dev->name, slave->perm_hwaddr,
1922                                     bond_dev->name, slave_dev->name);
1923         }
1924
1925         if (rtnl_dereference(bond->primary_slave) == slave)
1926                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1927
1928         if (oldcurrent == slave)
1929                 bond_change_active_slave(bond, NULL);
1930
1931         if (bond_is_lb(bond)) {
1932                 /* Must be called only after the slave has been
1933                  * detached from the list and the curr_active_slave
1934                  * has been cleared (if our_slave == old_current),
1935                  * but before a new active slave is selected.
1936                  */
1937                 bond_alb_deinit_slave(bond, slave);
1938         }
1939
1940         if (all) {
1941                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1942         } else if (oldcurrent == slave) {
1943                 /* Note that we hold RTNL over this sequence, so there
1944                  * is no concern that another slave add/remove event
1945                  * will interfere.
1946                  */
1947                 bond_select_active_slave(bond);
1948         }
1949
1950         if (!bond_has_slaves(bond)) {
1951                 bond_set_carrier(bond);
1952                 eth_hw_addr_random(bond_dev);
1953                 bond->nest_level = SINGLE_DEPTH_NESTING;
1954         } else {
1955                 bond->nest_level = dev_get_nest_level(bond_dev) + 1;
1956         }
1957
1958         unblock_netpoll_tx();
1959         synchronize_rcu();
1960         bond->slave_cnt--;
1961
1962         if (!bond_has_slaves(bond)) {
1963                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1964                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1965         }
1966
1967         bond_compute_features(bond);
1968         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1969             (old_features & NETIF_F_VLAN_CHALLENGED))
1970                 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1971                             slave_dev->name, bond_dev->name);
1972
1973         vlan_vids_del_by_dev(slave_dev, bond_dev);
1974
1975         /* If the mode uses primary, then this case was handled above by
1976          * bond_change_active_slave(..., NULL)
1977          */
1978         if (!bond_uses_primary(bond)) {
1979                 /* unset promiscuity level from slave
1980                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1981                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1982                  * value of that flag before that change, as that was the value
1983                  * when this slave was attached, so we cache at the start of the
1984                  * function and use it here. Same goes for ALLMULTI below
1985                  */
1986                 if (old_flags & IFF_PROMISC)
1987                         dev_set_promiscuity(slave_dev, -1);
1988
1989                 /* unset allmulti level from slave */
1990                 if (old_flags & IFF_ALLMULTI)
1991                         dev_set_allmulti(slave_dev, -1);
1992
1993                 bond_hw_addr_flush(bond_dev, slave_dev);
1994         }
1995
1996         slave_disable_netpoll(slave);
1997
1998         /* close slave before restoring its mac address */
1999         dev_close(slave_dev);
2000
2001         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2002             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2003                 /* restore original ("permanent") mac address */
2004                 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2005                                   slave->dev->addr_len);
2006                 ss.ss_family = slave_dev->type;
2007                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
2008         }
2009
2010         if (unregister)
2011                 __dev_set_mtu(slave_dev, slave->original_mtu);
2012         else
2013                 dev_set_mtu(slave_dev, slave->original_mtu);
2014
2015         if (!netif_is_bond_master(slave_dev))
2016                 slave_dev->priv_flags &= ~IFF_BONDING;
2017
2018         kobject_put(&slave->kobj);
2019
2020         return 0;
2021 }
2022
2023 /* A wrapper used because of ndo_del_link */
2024 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2025 {
2026         return __bond_release_one(bond_dev, slave_dev, false, false);
2027 }
2028
2029 /* First release a slave and then destroy the bond if no more slaves are left.
2030  * Must be under rtnl_lock when this function is called.
2031  */
2032 static int  bond_release_and_destroy(struct net_device *bond_dev,
2033                                      struct net_device *slave_dev)
2034 {
2035         struct bonding *bond = netdev_priv(bond_dev);
2036         int ret;
2037
2038         ret = __bond_release_one(bond_dev, slave_dev, false, true);
2039         if (ret == 0 && !bond_has_slaves(bond) &&
2040             bond_dev->reg_state != NETREG_UNREGISTERING) {
2041                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2042                 netdev_info(bond_dev, "Destroying bond %s\n",
2043                             bond_dev->name);
2044                 bond_remove_proc_entry(bond);
2045                 unregister_netdevice(bond_dev);
2046         }
2047         return ret;
2048 }
2049
2050 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2051 {
2052         struct bonding *bond = netdev_priv(bond_dev);
2053         bond_fill_ifbond(bond, info);
2054 }
2055
2056 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2057 {
2058         struct bonding *bond = netdev_priv(bond_dev);
2059         struct list_head *iter;
2060         int i = 0, res = -ENODEV;
2061         struct slave *slave;
2062
2063         bond_for_each_slave(bond, slave, iter) {
2064                 if (i++ == (int)info->slave_id) {
2065                         res = 0;
2066                         bond_fill_ifslave(slave, info);
2067                         break;
2068                 }
2069         }
2070
2071         return res;
2072 }
2073
2074 /*-------------------------------- Monitoring -------------------------------*/
2075
2076 /* called with rcu_read_lock() */
2077 static int bond_miimon_inspect(struct bonding *bond)
2078 {
2079         bool ignore_updelay = false;
2080         int link_state, commit = 0;
2081         struct list_head *iter;
2082         struct slave *slave;
2083
2084         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2085
2086         bond_for_each_slave_rcu(bond, slave, iter) {
2087                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2088
2089                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2090
2091                 switch (slave->link) {
2092                 case BOND_LINK_UP:
2093                         if (link_state)
2094                                 continue;
2095
2096                         bond_propose_link_state(slave, BOND_LINK_FAIL);
2097                         commit++;
2098                         slave->delay = bond->params.downdelay;
2099                         if (slave->delay) {
2100                                 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2101                                             (BOND_MODE(bond) ==
2102                                              BOND_MODE_ACTIVEBACKUP) ?
2103                                              (bond_is_active_slave(slave) ?
2104                                               "active " : "backup ") : "",
2105                                             slave->dev->name,
2106                                             bond->params.downdelay * bond->params.miimon);
2107                         }
2108                         /*FALLTHRU*/
2109                 case BOND_LINK_FAIL:
2110                         if (link_state) {
2111                                 /* recovered before downdelay expired */
2112                                 bond_propose_link_state(slave, BOND_LINK_UP);
2113                                 slave->last_link_up = jiffies;
2114                                 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2115                                             (bond->params.downdelay - slave->delay) *
2116                                             bond->params.miimon,
2117                                             slave->dev->name);
2118                                 commit++;
2119                                 continue;
2120                         }
2121
2122                         if (slave->delay <= 0) {
2123                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2124                                 commit++;
2125                                 continue;
2126                         }
2127
2128                         slave->delay--;
2129                         break;
2130
2131                 case BOND_LINK_DOWN:
2132                         if (!link_state)
2133                                 continue;
2134
2135                         bond_propose_link_state(slave, BOND_LINK_BACK);
2136                         commit++;
2137                         slave->delay = bond->params.updelay;
2138
2139                         if (slave->delay) {
2140                                 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2141                                             slave->dev->name,
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                                 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2151                                             (bond->params.updelay - slave->delay) *
2152                                             bond->params.miimon,
2153                                             slave->dev->name);
2154                                 commit++;
2155                                 continue;
2156                         }
2157
2158                         if (ignore_updelay)
2159                                 slave->delay = 0;
2160
2161                         if (slave->delay <= 0) {
2162                                 bond_propose_link_state(slave, BOND_LINK_UP);
2163                                 commit++;
2164                                 ignore_updelay = false;
2165                                 continue;
2166                         }
2167
2168                         slave->delay--;
2169                         break;
2170                 }
2171         }
2172
2173         return commit;
2174 }
2175
2176 static void bond_miimon_commit(struct bonding *bond)
2177 {
2178         struct list_head *iter;
2179         struct slave *slave, *primary;
2180
2181         bond_for_each_slave(bond, slave, iter) {
2182                 switch (slave->link_new_state) {
2183                 case BOND_LINK_NOCHANGE:
2184                         /* For 802.3ad mode, check current slave speed and
2185                          * duplex again in case its port was disabled after
2186                          * invalid speed/duplex reporting but recovered before
2187                          * link monitoring could make a decision on the actual
2188                          * link status
2189                          */
2190                         if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2191                             slave->link == BOND_LINK_UP)
2192                                 bond_3ad_adapter_speed_duplex_changed(slave);
2193                         continue;
2194
2195                 case BOND_LINK_UP:
2196                         if (bond_update_speed_duplex(slave) &&
2197                             bond_needs_speed_duplex(bond)) {
2198                                 slave->link = BOND_LINK_DOWN;
2199                                 if (net_ratelimit())
2200                                         netdev_warn(bond->dev,
2201                                                     "failed to get link speed/duplex for %s\n",
2202                                                     slave->dev->name);
2203                                 continue;
2204                         }
2205                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2206                                                   BOND_SLAVE_NOTIFY_NOW);
2207                         slave->last_link_up = jiffies;
2208
2209                         primary = rtnl_dereference(bond->primary_slave);
2210                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2211                                 /* prevent it from being the active one */
2212                                 bond_set_backup_slave(slave);
2213                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2214                                 /* make it immediately active */
2215                                 bond_set_active_slave(slave);
2216                         }
2217
2218                         netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2219                                     slave->dev->name,
2220                                     slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2221                                     slave->duplex ? "full" : "half");
2222
2223                         /* notify ad that the link status has changed */
2224                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2225                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2226
2227                         if (bond_is_lb(bond))
2228                                 bond_alb_handle_link_change(bond, slave,
2229                                                             BOND_LINK_UP);
2230
2231                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2232                                 bond_update_slave_arr(bond, NULL);
2233
2234                         if (!bond->curr_active_slave || slave == primary)
2235                                 goto do_failover;
2236
2237                         continue;
2238
2239                 case BOND_LINK_DOWN:
2240                         if (slave->link_failure_count < UINT_MAX)
2241                                 slave->link_failure_count++;
2242
2243                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2244                                                   BOND_SLAVE_NOTIFY_NOW);
2245
2246                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2247                             BOND_MODE(bond) == BOND_MODE_8023AD)
2248                                 bond_set_slave_inactive_flags(slave,
2249                                                               BOND_SLAVE_NOTIFY_NOW);
2250
2251                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2252                                     slave->dev->name);
2253
2254                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2255                                 bond_3ad_handle_link_change(slave,
2256                                                             BOND_LINK_DOWN);
2257
2258                         if (bond_is_lb(bond))
2259                                 bond_alb_handle_link_change(bond, slave,
2260                                                             BOND_LINK_DOWN);
2261
2262                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2263                                 bond_update_slave_arr(bond, NULL);
2264
2265                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2266                                 goto do_failover;
2267
2268                         continue;
2269
2270                 default:
2271                         netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2272                                    slave->link_new_state, slave->dev->name);
2273                         bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2274
2275                         continue;
2276                 }
2277
2278 do_failover:
2279                 block_netpoll_tx();
2280                 bond_select_active_slave(bond);
2281                 unblock_netpoll_tx();
2282         }
2283
2284         bond_set_carrier(bond);
2285 }
2286
2287 /* bond_mii_monitor
2288  *
2289  * Really a wrapper that splits the mii monitor into two phases: an
2290  * inspection, then (if inspection indicates something needs to be done)
2291  * an acquisition of appropriate locks followed by a commit phase to
2292  * implement whatever link state changes are indicated.
2293  */
2294 static void bond_mii_monitor(struct work_struct *work)
2295 {
2296         struct bonding *bond = container_of(work, struct bonding,
2297                                             mii_work.work);
2298         bool should_notify_peers = false;
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
2310         should_notify_peers = bond_should_notify_peers(bond);
2311
2312         if (bond_miimon_inspect(bond)) {
2313                 rcu_read_unlock();
2314
2315                 /* Race avoidance with bond_close cancel of workqueue */
2316                 if (!rtnl_trylock()) {
2317                         delay = 1;
2318                         should_notify_peers = false;
2319                         goto re_arm;
2320                 }
2321
2322                 bond_for_each_slave(bond, slave, iter) {
2323                         bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2324                 }
2325                 bond_miimon_commit(bond);
2326
2327                 rtnl_unlock();  /* might sleep, hold no other locks */
2328         } else
2329                 rcu_read_unlock();
2330
2331 re_arm:
2332         if (bond->params.miimon)
2333                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2334
2335         if (should_notify_peers) {
2336                 if (!rtnl_trylock())
2337                         return;
2338                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2339                 rtnl_unlock();
2340         }
2341 }
2342
2343 static int bond_upper_dev_walk(struct net_device *upper, void *data)
2344 {
2345         __be32 ip = *((__be32 *)data);
2346
2347         return ip == bond_confirm_addr(upper, 0, ip);
2348 }
2349
2350 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2351 {
2352         bool ret = false;
2353
2354         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2355                 return true;
2356
2357         rcu_read_lock();
2358         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2359                 ret = true;
2360         rcu_read_unlock();
2361
2362         return ret;
2363 }
2364
2365 /* We go to the (large) trouble of VLAN tagging ARP frames because
2366  * switches in VLAN mode (especially if ports are configured as
2367  * "native" to a VLAN) might not pass non-tagged frames.
2368  */
2369 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2370                           __be32 dest_ip, __be32 src_ip,
2371                           struct bond_vlan_tag *tags)
2372 {
2373         struct sk_buff *skb;
2374         struct bond_vlan_tag *outer_tag = tags;
2375
2376         netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2377                    arp_op, slave_dev->name, &dest_ip, &src_ip);
2378
2379         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2380                          NULL, slave_dev->dev_addr, NULL);
2381
2382         if (!skb) {
2383                 net_err_ratelimited("ARP packet allocation failed\n");
2384                 return;
2385         }
2386
2387         if (!tags || tags->vlan_proto == VLAN_N_VID)
2388                 goto xmit;
2389
2390         tags++;
2391
2392         /* Go through all the tags backwards and add them to the packet */
2393         while (tags->vlan_proto != VLAN_N_VID) {
2394                 if (!tags->vlan_id) {
2395                         tags++;
2396                         continue;
2397                 }
2398
2399                 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2400                            ntohs(outer_tag->vlan_proto), tags->vlan_id);
2401                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2402                                                 tags->vlan_id);
2403                 if (!skb) {
2404                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2405                         return;
2406                 }
2407
2408                 tags++;
2409         }
2410         /* Set the outer tag */
2411         if (outer_tag->vlan_id) {
2412                 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2413                            ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2414                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2415                                        outer_tag->vlan_id);
2416         }
2417
2418 xmit:
2419         arp_xmit(skb);
2420 }
2421
2422 /* Validate the device path between the @start_dev and the @end_dev.
2423  * The path is valid if the @end_dev is reachable through device
2424  * stacking.
2425  * When the path is validated, collect any vlan information in the
2426  * path.
2427  */
2428 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2429                                               struct net_device *end_dev,
2430                                               int level)
2431 {
2432         struct bond_vlan_tag *tags;
2433         struct net_device *upper;
2434         struct list_head  *iter;
2435
2436         if (start_dev == end_dev) {
2437                 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2438                 if (!tags)
2439                         return ERR_PTR(-ENOMEM);
2440                 tags[level].vlan_proto = VLAN_N_VID;
2441                 return tags;
2442         }
2443
2444         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2445                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2446                 if (IS_ERR_OR_NULL(tags)) {
2447                         if (IS_ERR(tags))
2448                                 return tags;
2449                         continue;
2450                 }
2451                 if (is_vlan_dev(upper)) {
2452                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2453                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2454                 }
2455
2456                 return tags;
2457         }
2458
2459         return NULL;
2460 }
2461
2462 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2463 {
2464         struct rtable *rt;
2465         struct bond_vlan_tag *tags;
2466         __be32 *targets = bond->params.arp_targets, addr;
2467         int i;
2468
2469         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2470                 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2471                 tags = NULL;
2472
2473                 /* Find out through which dev should the packet go */
2474                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2475                                      RTO_ONLINK, 0);
2476                 if (IS_ERR(rt)) {
2477                         /* there's no route to target - try to send arp
2478                          * probe to generate any traffic (arp_validate=0)
2479                          */
2480                         if (bond->params.arp_validate)
2481                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2482                                                      bond->dev->name,
2483                                                      &targets[i]);
2484                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2485                                       0, tags);
2486                         continue;
2487                 }
2488
2489                 /* bond device itself */
2490                 if (rt->dst.dev == bond->dev)
2491                         goto found;
2492
2493                 rcu_read_lock();
2494                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2495                 rcu_read_unlock();
2496
2497                 if (!IS_ERR_OR_NULL(tags))
2498                         goto found;
2499
2500                 /* Not our device - skip */
2501                 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2502                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2503
2504                 ip_rt_put(rt);
2505                 continue;
2506
2507 found:
2508                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2509                 ip_rt_put(rt);
2510                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2511                               addr, tags);
2512                 kfree(tags);
2513         }
2514 }
2515
2516 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2517 {
2518         int i;
2519
2520         if (!sip || !bond_has_this_ip(bond, tip)) {
2521                 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2522                            &sip, &tip);
2523                 return;
2524         }
2525
2526         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2527         if (i == -1) {
2528                 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2529                            &sip);
2530                 return;
2531         }
2532         slave->last_rx = jiffies;
2533         slave->target_last_arp_rx[i] = jiffies;
2534 }
2535
2536 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2537                  struct slave *slave)
2538 {
2539         struct arphdr *arp = (struct arphdr *)skb->data;
2540         struct slave *curr_active_slave, *curr_arp_slave;
2541         unsigned char *arp_ptr;
2542         __be32 sip, tip;
2543         int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2544
2545         if (!slave_do_arp_validate(bond, slave)) {
2546                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2547                     !slave_do_arp_validate_only(bond))
2548                         slave->last_rx = jiffies;
2549                 return RX_HANDLER_ANOTHER;
2550         } else if (!is_arp) {
2551                 return RX_HANDLER_ANOTHER;
2552         }
2553
2554         alen = arp_hdr_len(bond->dev);
2555
2556         netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2557                    skb->dev->name);
2558
2559         if (alen > skb_headlen(skb)) {
2560                 arp = kmalloc(alen, GFP_ATOMIC);
2561                 if (!arp)
2562                         goto out_unlock;
2563                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2564                         goto out_unlock;
2565         }
2566
2567         if (arp->ar_hln != bond->dev->addr_len ||
2568             skb->pkt_type == PACKET_OTHERHOST ||
2569             skb->pkt_type == PACKET_LOOPBACK ||
2570             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2571             arp->ar_pro != htons(ETH_P_IP) ||
2572             arp->ar_pln != 4)
2573                 goto out_unlock;
2574
2575         arp_ptr = (unsigned char *)(arp + 1);
2576         arp_ptr += bond->dev->addr_len;
2577         memcpy(&sip, arp_ptr, 4);
2578         arp_ptr += 4 + bond->dev->addr_len;
2579         memcpy(&tip, arp_ptr, 4);
2580
2581         netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2582                    slave->dev->name, bond_slave_state(slave),
2583                      bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2584                      &sip, &tip);
2585
2586         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2587         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2588
2589         /* We 'trust' the received ARP enough to validate it if:
2590          *
2591          * (a) the slave receiving the ARP is active (which includes the
2592          * current ARP slave, if any), or
2593          *
2594          * (b) the receiving slave isn't active, but there is a currently
2595          * active slave and it received valid arp reply(s) after it became
2596          * the currently active slave, or
2597          *
2598          * (c) there is an ARP slave that sent an ARP during the prior ARP
2599          * interval, and we receive an ARP reply on any slave.  We accept
2600          * these because switch FDB update delays may deliver the ARP
2601          * reply to a slave other than the sender of the ARP request.
2602          *
2603          * Note: for (b), backup slaves are receiving the broadcast ARP
2604          * request, not a reply.  This request passes from the sending
2605          * slave through the L2 switch(es) to the receiving slave.  Since
2606          * this is checking the request, sip/tip are swapped for
2607          * validation.
2608          *
2609          * This is done to avoid endless looping when we can't reach the
2610          * arp_ip_target and fool ourselves with our own arp requests.
2611          */
2612         if (bond_is_active_slave(slave))
2613                 bond_validate_arp(bond, slave, sip, tip);
2614         else if (curr_active_slave &&
2615                  time_after(slave_last_rx(bond, curr_active_slave),
2616                             curr_active_slave->last_link_up))
2617                 bond_validate_arp(bond, slave, tip, sip);
2618         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2619                  bond_time_in_interval(bond,
2620                                        dev_trans_start(curr_arp_slave->dev), 1))
2621                 bond_validate_arp(bond, slave, sip, tip);
2622
2623 out_unlock:
2624         if (arp != (struct arphdr *)skb->data)
2625                 kfree(arp);
2626         return RX_HANDLER_ANOTHER;
2627 }
2628
2629 /* function to verify if we're in the arp_interval timeslice, returns true if
2630  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2631  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2632  */
2633 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2634                                   int mod)
2635 {
2636         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2637
2638         return time_in_range(jiffies,
2639                              last_act - delta_in_ticks,
2640                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2641 }
2642
2643 /* This function is called regularly to monitor each slave's link
2644  * ensuring that traffic is being sent and received when arp monitoring
2645  * is used in load-balancing mode. if the adapter has been dormant, then an
2646  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2647  * arp monitoring in active backup mode.
2648  */
2649 static void bond_loadbalance_arp_mon(struct bonding *bond)
2650 {
2651         struct slave *slave, *oldcurrent;
2652         struct list_head *iter;
2653         int do_failover = 0, slave_state_changed = 0;
2654
2655         if (!bond_has_slaves(bond))
2656                 goto re_arm;
2657
2658         rcu_read_lock();
2659
2660         oldcurrent = rcu_dereference(bond->curr_active_slave);
2661         /* see if any of the previous devices are up now (i.e. they have
2662          * xmt and rcv traffic). the curr_active_slave does not come into
2663          * the picture unless it is null. also, slave->last_link_up is not
2664          * needed here because we send an arp on each slave and give a slave
2665          * as long as it needs to get the tx/rx within the delta.
2666          * TODO: what about up/down delay in arp mode? it wasn't here before
2667          *       so it can wait
2668          */
2669         bond_for_each_slave_rcu(bond, slave, iter) {
2670                 unsigned long trans_start = dev_trans_start(slave->dev);
2671
2672                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2673
2674                 if (slave->link != BOND_LINK_UP) {
2675                         if (bond_time_in_interval(bond, trans_start, 1) &&
2676                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2677
2678                                 bond_propose_link_state(slave, BOND_LINK_UP);
2679                                 slave_state_changed = 1;
2680
2681                                 /* primary_slave has no meaning in round-robin
2682                                  * mode. the window of a slave being up and
2683                                  * curr_active_slave being null after enslaving
2684                                  * is closed.
2685                                  */
2686                                 if (!oldcurrent) {
2687                                         netdev_info(bond->dev, "link status definitely up for interface %s\n",
2688                                                     slave->dev->name);
2689                                         do_failover = 1;
2690                                 } else {
2691                                         netdev_info(bond->dev, "interface %s is now up\n",
2692                                                     slave->dev->name);
2693                                 }
2694                         }
2695                 } else {
2696                         /* slave->link == BOND_LINK_UP */
2697
2698                         /* not all switches will respond to an arp request
2699                          * when the source ip is 0, so don't take the link down
2700                          * if we don't know our ip yet
2701                          */
2702                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2703                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2704
2705                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2706                                 slave_state_changed = 1;
2707
2708                                 if (slave->link_failure_count < UINT_MAX)
2709                                         slave->link_failure_count++;
2710
2711                                 netdev_info(bond->dev, "interface %s is now down\n",
2712                                             slave->dev->name);
2713
2714                                 if (slave == oldcurrent)
2715                                         do_failover = 1;
2716                         }
2717                 }
2718
2719                 /* note: if switch is in round-robin mode, all links
2720                  * must tx arp to ensure all links rx an arp - otherwise
2721                  * links may oscillate or not come up at all; if switch is
2722                  * in something like xor mode, there is nothing we can
2723                  * do - all replies will be rx'ed on same link causing slaves
2724                  * to be unstable during low/no traffic periods
2725                  */
2726                 if (bond_slave_is_up(slave))
2727                         bond_arp_send_all(bond, slave);
2728         }
2729
2730         rcu_read_unlock();
2731
2732         if (do_failover || slave_state_changed) {
2733                 if (!rtnl_trylock())
2734                         goto re_arm;
2735
2736                 bond_for_each_slave(bond, slave, iter) {
2737                         if (slave->link_new_state != BOND_LINK_NOCHANGE)
2738                                 slave->link = slave->link_new_state;
2739                 }
2740
2741                 if (slave_state_changed) {
2742                         bond_slave_state_change(bond);
2743                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2744                                 bond_update_slave_arr(bond, NULL);
2745                 }
2746                 if (do_failover) {
2747                         block_netpoll_tx();
2748                         bond_select_active_slave(bond);
2749                         unblock_netpoll_tx();
2750                 }
2751                 rtnl_unlock();
2752         }
2753
2754 re_arm:
2755         if (bond->params.arp_interval)
2756                 queue_delayed_work(bond->wq, &bond->arp_work,
2757                                    msecs_to_jiffies(bond->params.arp_interval));
2758 }
2759
2760 /* Called to inspect slaves for active-backup mode ARP monitor link state
2761  * changes.  Sets proposed link state in slaves to specify what action
2762  * should take place for the slave.  Returns 0 if no changes are found, >0
2763  * if changes to link states must be committed.
2764  *
2765  * Called with rcu_read_lock held.
2766  */
2767 static int bond_ab_arp_inspect(struct bonding *bond)
2768 {
2769         unsigned long trans_start, last_rx;
2770         struct list_head *iter;
2771         struct slave *slave;
2772         int commit = 0;
2773
2774         bond_for_each_slave_rcu(bond, slave, iter) {
2775                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2776                 last_rx = slave_last_rx(bond, slave);
2777
2778                 if (slave->link != BOND_LINK_UP) {
2779                         if (bond_time_in_interval(bond, last_rx, 1)) {
2780                                 bond_propose_link_state(slave, BOND_LINK_UP);
2781                                 commit++;
2782                         } else if (slave->link == BOND_LINK_BACK) {
2783                                 bond_propose_link_state(slave, BOND_LINK_FAIL);
2784                                 commit++;
2785                         }
2786                         continue;
2787                 }
2788
2789                 /* Give slaves 2*delta after being enslaved or made
2790                  * active.  This avoids bouncing, as the last receive
2791                  * times need a full ARP monitor cycle to be updated.
2792                  */
2793                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2794                         continue;
2795
2796                 /* Backup slave is down if:
2797                  * - No current_arp_slave AND
2798                  * - more than 3*delta since last receive AND
2799                  * - the bond has an IP address
2800                  *
2801                  * Note: a non-null current_arp_slave indicates
2802                  * the curr_active_slave went down and we are
2803                  * searching for a new one; under this condition
2804                  * we only take the curr_active_slave down - this
2805                  * gives each slave a chance to tx/rx traffic
2806                  * before being taken out
2807                  */
2808                 if (!bond_is_active_slave(slave) &&
2809                     !rcu_access_pointer(bond->current_arp_slave) &&
2810                     !bond_time_in_interval(bond, last_rx, 3)) {
2811                         bond_propose_link_state(slave, BOND_LINK_DOWN);
2812                         commit++;
2813                 }
2814
2815                 /* Active slave is down if:
2816                  * - more than 2*delta since transmitting OR
2817                  * - (more than 2*delta since receive AND
2818                  *    the bond has an IP address)
2819                  */
2820                 trans_start = dev_trans_start(slave->dev);
2821                 if (bond_is_active_slave(slave) &&
2822                     (!bond_time_in_interval(bond, trans_start, 2) ||
2823                      !bond_time_in_interval(bond, last_rx, 2))) {
2824                         bond_propose_link_state(slave, BOND_LINK_DOWN);
2825                         commit++;
2826                 }
2827         }
2828
2829         return commit;
2830 }
2831
2832 /* Called to commit link state changes noted by inspection step of
2833  * active-backup mode ARP monitor.
2834  *
2835  * Called with RTNL hold.
2836  */
2837 static void bond_ab_arp_commit(struct bonding *bond)
2838 {
2839         unsigned long trans_start;
2840         struct list_head *iter;
2841         struct slave *slave;
2842
2843         bond_for_each_slave(bond, slave, iter) {
2844                 switch (slave->link_new_state) {
2845                 case BOND_LINK_NOCHANGE:
2846                         continue;
2847
2848                 case BOND_LINK_UP:
2849                         trans_start = dev_trans_start(slave->dev);
2850                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2851                             (!rtnl_dereference(bond->curr_active_slave) &&
2852                              bond_time_in_interval(bond, trans_start, 1))) {
2853                                 struct slave *current_arp_slave;
2854
2855                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2856                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
2857                                                           BOND_SLAVE_NOTIFY_NOW);
2858                                 if (current_arp_slave) {
2859                                         bond_set_slave_inactive_flags(
2860                                                 current_arp_slave,
2861                                                 BOND_SLAVE_NOTIFY_NOW);
2862                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2863                                 }
2864
2865                                 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2866                                             slave->dev->name);
2867
2868                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2869                                     slave == rtnl_dereference(bond->primary_slave))
2870                                         goto do_failover;
2871
2872                         }
2873
2874                         continue;
2875
2876                 case BOND_LINK_DOWN:
2877                         if (slave->link_failure_count < UINT_MAX)
2878                                 slave->link_failure_count++;
2879
2880                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2881                                                   BOND_SLAVE_NOTIFY_NOW);
2882                         bond_set_slave_inactive_flags(slave,
2883                                                       BOND_SLAVE_NOTIFY_NOW);
2884
2885                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2886                                     slave->dev->name);
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                 case BOND_LINK_FAIL:
2896                         bond_set_slave_link_state(slave, BOND_LINK_FAIL,
2897                                                   BOND_SLAVE_NOTIFY_NOW);
2898                         bond_set_slave_inactive_flags(slave,
2899                                                       BOND_SLAVE_NOTIFY_NOW);
2900
2901                         /* A slave has just been enslaved and has become
2902                          * the current active slave.
2903                          */
2904                         if (rtnl_dereference(bond->curr_active_slave))
2905                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2906                         continue;
2907
2908                 default:
2909                         netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2910                                    slave->link_new_state, slave->dev->name);
2911                         continue;
2912                 }
2913
2914 do_failover:
2915                 block_netpoll_tx();
2916                 bond_select_active_slave(bond);
2917                 unblock_netpoll_tx();
2918         }
2919
2920         bond_set_carrier(bond);
2921 }
2922
2923 /* Send ARP probes for active-backup mode ARP monitor.
2924  *
2925  * Called with rcu_read_lock held.
2926  */
2927 static bool bond_ab_arp_probe(struct bonding *bond)
2928 {
2929         struct slave *slave, *before = NULL, *new_slave = NULL,
2930                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2931                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2932         struct list_head *iter;
2933         bool found = false;
2934         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2935
2936         if (curr_arp_slave && curr_active_slave)
2937                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2938                             curr_arp_slave->dev->name,
2939                             curr_active_slave->dev->name);
2940
2941         if (curr_active_slave) {
2942                 bond_arp_send_all(bond, curr_active_slave);
2943                 return should_notify_rtnl;
2944         }
2945
2946         /* if we don't have a curr_active_slave, search for the next available
2947          * backup slave from the current_arp_slave and make it the candidate
2948          * for becoming the curr_active_slave
2949          */
2950
2951         if (!curr_arp_slave) {
2952                 curr_arp_slave = bond_first_slave_rcu(bond);
2953                 if (!curr_arp_slave)
2954                         return should_notify_rtnl;
2955         }
2956
2957         bond_for_each_slave_rcu(bond, slave, iter) {
2958                 if (!found && !before && bond_slave_is_up(slave))
2959                         before = slave;
2960
2961                 if (found && !new_slave && bond_slave_is_up(slave))
2962                         new_slave = slave;
2963                 /* if the link state is up at this point, we
2964                  * mark it down - this can happen if we have
2965                  * simultaneous link failures and
2966                  * reselect_active_interface doesn't make this
2967                  * one the current slave so it is still marked
2968                  * up when it is actually down
2969                  */
2970                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2971                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2972                                                   BOND_SLAVE_NOTIFY_LATER);
2973                         if (slave->link_failure_count < UINT_MAX)
2974                                 slave->link_failure_count++;
2975
2976                         bond_set_slave_inactive_flags(slave,
2977                                                       BOND_SLAVE_NOTIFY_LATER);
2978
2979                         netdev_info(bond->dev, "backup interface %s is now down\n",
2980                                     slave->dev->name);
2981                 }
2982                 if (slave == curr_arp_slave)
2983                         found = true;
2984         }
2985
2986         if (!new_slave && before)
2987                 new_slave = before;
2988
2989         if (!new_slave)
2990                 goto check_state;
2991
2992         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2993                                   BOND_SLAVE_NOTIFY_LATER);
2994         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2995         bond_arp_send_all(bond, new_slave);
2996         new_slave->last_link_up = jiffies;
2997         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2998
2999 check_state:
3000         bond_for_each_slave_rcu(bond, slave, iter) {
3001                 if (slave->should_notify || slave->should_notify_link) {
3002                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3003                         break;
3004                 }
3005         }
3006         return should_notify_rtnl;
3007 }
3008
3009 static void bond_activebackup_arp_mon(struct bonding *bond)
3010 {
3011         bool should_notify_peers = false;
3012         bool should_notify_rtnl = false;
3013         int delta_in_ticks;
3014
3015         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3016
3017         if (!bond_has_slaves(bond))
3018                 goto re_arm;
3019
3020         rcu_read_lock();
3021
3022         should_notify_peers = bond_should_notify_peers(bond);
3023
3024         if (bond_ab_arp_inspect(bond)) {
3025                 rcu_read_unlock();
3026
3027                 /* Race avoidance with bond_close flush of workqueue */
3028                 if (!rtnl_trylock()) {
3029                         delta_in_ticks = 1;
3030                         should_notify_peers = false;
3031                         goto re_arm;
3032                 }
3033
3034                 bond_ab_arp_commit(bond);
3035
3036                 rtnl_unlock();
3037                 rcu_read_lock();
3038         }
3039
3040         should_notify_rtnl = bond_ab_arp_probe(bond);
3041         rcu_read_unlock();
3042
3043 re_arm:
3044         if (bond->params.arp_interval)
3045                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3046
3047         if (should_notify_peers || should_notify_rtnl) {
3048                 if (!rtnl_trylock())
3049                         return;
3050
3051                 if (should_notify_peers) {
3052                         bond->send_peer_notif--;
3053                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3054                                                  bond->dev);
3055                 }
3056                 if (should_notify_rtnl) {
3057                         bond_slave_state_notify(bond);
3058                         bond_slave_link_notify(bond);
3059                 }
3060
3061                 rtnl_unlock();
3062         }
3063 }
3064
3065 static void bond_arp_monitor(struct work_struct *work)
3066 {
3067         struct bonding *bond = container_of(work, struct bonding,
3068                                             arp_work.work);
3069
3070         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3071                 bond_activebackup_arp_mon(bond);
3072         else
3073                 bond_loadbalance_arp_mon(bond);
3074 }
3075
3076 /*-------------------------- netdev event handling --------------------------*/
3077
3078 /* Change device name */
3079 static int bond_event_changename(struct bonding *bond)
3080 {
3081         bond_remove_proc_entry(bond);
3082         bond_create_proc_entry(bond);
3083
3084         bond_debug_reregister(bond);
3085
3086         return NOTIFY_DONE;
3087 }
3088
3089 static int bond_master_netdev_event(unsigned long event,
3090                                     struct net_device *bond_dev)
3091 {
3092         struct bonding *event_bond = netdev_priv(bond_dev);
3093
3094         switch (event) {
3095         case NETDEV_CHANGENAME:
3096                 return bond_event_changename(event_bond);
3097         case NETDEV_UNREGISTER:
3098                 bond_remove_proc_entry(event_bond);
3099                 break;
3100         case NETDEV_REGISTER:
3101                 bond_create_proc_entry(event_bond);
3102                 break;
3103         case NETDEV_NOTIFY_PEERS:
3104                 if (event_bond->send_peer_notif)
3105                         event_bond->send_peer_notif--;
3106                 break;
3107         default:
3108                 break;
3109         }
3110
3111         return NOTIFY_DONE;
3112 }
3113
3114 static int bond_slave_netdev_event(unsigned long event,
3115                                    struct net_device *slave_dev)
3116 {
3117         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3118         struct bonding *bond;
3119         struct net_device *bond_dev;
3120
3121         /* A netdev event can be generated while enslaving a device
3122          * before netdev_rx_handler_register is called in which case
3123          * slave will be NULL
3124          */
3125         if (!slave)
3126                 return NOTIFY_DONE;
3127         bond_dev = slave->bond->dev;
3128         bond = slave->bond;
3129         primary = rtnl_dereference(bond->primary_slave);
3130
3131         switch (event) {
3132         case NETDEV_UNREGISTER:
3133                 if (bond_dev->type != ARPHRD_ETHER)
3134                         bond_release_and_destroy(bond_dev, slave_dev);
3135                 else
3136                         __bond_release_one(bond_dev, slave_dev, false, true);
3137                 break;
3138         case NETDEV_UP:
3139         case NETDEV_CHANGE:
3140                 bond_update_speed_duplex(slave);
3141                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3142                         bond_3ad_adapter_speed_duplex_changed(slave);
3143                 /* Fallthrough */
3144         case NETDEV_DOWN:
3145                 /* Refresh slave-array if applicable!
3146                  * If the setup does not use miimon or arpmon (mode-specific!),
3147                  * then these events will not cause the slave-array to be
3148                  * refreshed. This will cause xmit to use a slave that is not
3149                  * usable. Avoid such situation by refeshing the array at these
3150                  * events. If these (miimon/arpmon) parameters are configured
3151                  * then array gets refreshed twice and that should be fine!
3152                  */
3153                 if (bond_mode_uses_xmit_hash(bond))
3154                         bond_update_slave_arr(bond, NULL);
3155                 break;
3156         case NETDEV_CHANGEMTU:
3157                 /* TODO: Should slaves be allowed to
3158                  * independently alter their MTU?  For
3159                  * an active-backup bond, slaves need
3160                  * not be the same type of device, so
3161                  * MTUs may vary.  For other modes,
3162                  * slaves arguably should have the
3163                  * same MTUs. To do this, we'd need to
3164                  * take over the slave's change_mtu
3165                  * function for the duration of their
3166                  * servitude.
3167                  */
3168                 break;
3169         case NETDEV_CHANGENAME:
3170                 /* we don't care if we don't have primary set */
3171                 if (!bond_uses_primary(bond) ||
3172                     !bond->params.primary[0])
3173                         break;
3174
3175                 if (slave == primary) {
3176                         /* slave's name changed - he's no longer primary */
3177                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3178                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3179                         /* we have a new primary slave */
3180                         rcu_assign_pointer(bond->primary_slave, slave);
3181                 } else { /* we didn't change primary - exit */
3182                         break;
3183                 }
3184
3185                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3186                             primary ? slave_dev->name : "none");
3187
3188                 block_netpoll_tx();
3189                 bond_select_active_slave(bond);
3190                 unblock_netpoll_tx();
3191                 break;
3192         case NETDEV_FEAT_CHANGE:
3193                 bond_compute_features(bond);
3194                 break;
3195         case NETDEV_RESEND_IGMP:
3196                 /* Propagate to master device */
3197                 call_netdevice_notifiers(event, slave->bond->dev);
3198                 break;
3199         default:
3200                 break;
3201         }
3202
3203         return NOTIFY_DONE;
3204 }
3205
3206 /* bond_netdev_event: handle netdev notifier chain events.
3207  *
3208  * This function receives events for the netdev chain.  The caller (an
3209  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3210  * locks for us to safely manipulate the slave devices (RTNL lock,
3211  * dev_probe_lock).
3212  */
3213 static int bond_netdev_event(struct notifier_block *this,
3214                              unsigned long event, void *ptr)
3215 {
3216         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3217
3218         netdev_dbg(event_dev, "event: %lx\n", event);
3219
3220         if (!(event_dev->priv_flags & IFF_BONDING))
3221                 return NOTIFY_DONE;
3222
3223         if (event_dev->flags & IFF_MASTER) {
3224                 int ret;
3225
3226                 netdev_dbg(event_dev, "IFF_MASTER\n");
3227                 ret = bond_master_netdev_event(event, event_dev);
3228                 if (ret != NOTIFY_DONE)
3229                         return ret;
3230         }
3231
3232         if (event_dev->flags & IFF_SLAVE) {
3233                 netdev_dbg(event_dev, "IFF_SLAVE\n");
3234                 return bond_slave_netdev_event(event, event_dev);
3235         }
3236
3237         return NOTIFY_DONE;
3238 }
3239
3240 static struct notifier_block bond_netdev_notifier = {
3241         .notifier_call = bond_netdev_event,
3242 };
3243
3244 /*---------------------------- Hashing Policies -----------------------------*/
3245
3246 /* L2 hash helper */
3247 static inline u32 bond_eth_hash(struct sk_buff *skb)
3248 {
3249         struct ethhdr *ep, hdr_tmp;
3250
3251         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3252         if (ep)
3253                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3254         return 0;
3255 }
3256
3257 /* Extract the appropriate headers based on bond's xmit policy */
3258 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3259                               struct flow_keys *fk)
3260 {
3261         const struct ipv6hdr *iph6;
3262         const struct iphdr *iph;
3263         int noff, proto = -1;
3264
3265         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3266                 return skb_flow_dissect_flow_keys(skb, fk, 0);
3267
3268         fk->ports.ports = 0;
3269         noff = skb_network_offset(skb);
3270         if (skb->protocol == htons(ETH_P_IP)) {
3271                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3272                         return false;
3273                 iph = ip_hdr(skb);
3274                 iph_to_flow_copy_v4addrs(fk, iph);
3275                 noff += iph->ihl << 2;
3276                 if (!ip_is_fragment(iph))
3277                         proto = iph->protocol;
3278         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3279                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3280                         return false;
3281                 iph6 = ipv6_hdr(skb);
3282                 iph_to_flow_copy_v6addrs(fk, iph6);
3283                 noff += sizeof(*iph6);
3284                 proto = iph6->nexthdr;
3285         } else {
3286                 return false;
3287         }
3288         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3289                 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3290
3291         return true;
3292 }
3293
3294 /**
3295  * bond_xmit_hash - generate a hash value based on the xmit policy
3296  * @bond: bonding device
3297  * @skb: buffer to use for headers
3298  *
3299  * This function will extract the necessary headers from the skb buffer and use
3300  * them to generate a hash based on the xmit_policy set in the bonding device
3301  */
3302 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3303 {
3304         struct flow_keys flow;
3305         u32 hash;
3306
3307         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3308             skb->l4_hash)
3309                 return skb->hash;
3310
3311         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3312             !bond_flow_dissect(bond, skb, &flow))
3313                 return bond_eth_hash(skb);
3314
3315         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3316             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3317                 hash = bond_eth_hash(skb);
3318         else
3319                 hash = (__force u32)flow.ports.ports;
3320         hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3321                 (__force u32)flow_get_u32_src(&flow);
3322         hash ^= (hash >> 16);
3323         hash ^= (hash >> 8);
3324
3325         return hash >> 1;
3326 }
3327
3328 /*-------------------------- Device entry points ----------------------------*/
3329
3330 void bond_work_init_all(struct bonding *bond)
3331 {
3332         INIT_DELAYED_WORK(&bond->mcast_work,
3333                           bond_resend_igmp_join_requests_delayed);
3334         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3335         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3336         INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3337         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3338         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3339 }
3340
3341 static void bond_work_cancel_all(struct bonding *bond)
3342 {
3343         cancel_delayed_work_sync(&bond->mii_work);
3344         cancel_delayed_work_sync(&bond->arp_work);
3345         cancel_delayed_work_sync(&bond->alb_work);
3346         cancel_delayed_work_sync(&bond->ad_work);
3347         cancel_delayed_work_sync(&bond->mcast_work);
3348         cancel_delayed_work_sync(&bond->slave_arr_work);
3349 }
3350
3351 static int bond_open(struct net_device *bond_dev)
3352 {
3353         struct bonding *bond = netdev_priv(bond_dev);
3354         struct list_head *iter;
3355         struct slave *slave;
3356
3357         /* reset slave->backup and slave->inactive */
3358         if (bond_has_slaves(bond)) {
3359                 bond_for_each_slave(bond, slave, iter) {
3360                         if (bond_uses_primary(bond) &&
3361                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3362                                 bond_set_slave_inactive_flags(slave,
3363                                                               BOND_SLAVE_NOTIFY_NOW);
3364                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3365                                 bond_set_slave_active_flags(slave,
3366                                                             BOND_SLAVE_NOTIFY_NOW);
3367                         }
3368                 }
3369         }
3370
3371         if (bond_is_lb(bond)) {
3372                 /* bond_alb_initialize must be called before the timer
3373                  * is started.
3374                  */
3375                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3376                         return -ENOMEM;
3377                 if (bond->params.tlb_dynamic_lb)
3378                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3379         }
3380
3381         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3382                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3383
3384         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3385                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3386                 bond->recv_probe = bond_arp_rcv;
3387         }
3388
3389         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3390                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3391                 /* register to receive LACPDUs */
3392                 bond->recv_probe = bond_3ad_lacpdu_recv;
3393                 bond_3ad_initiate_agg_selection(bond, 1);
3394         }
3395
3396         if (bond_mode_uses_xmit_hash(bond))
3397                 bond_update_slave_arr(bond, NULL);
3398
3399         return 0;
3400 }
3401
3402 static int bond_close(struct net_device *bond_dev)
3403 {
3404         struct bonding *bond = netdev_priv(bond_dev);
3405
3406         bond_work_cancel_all(bond);
3407         bond->send_peer_notif = 0;
3408         if (bond_is_lb(bond))
3409                 bond_alb_deinitialize(bond);
3410         bond->recv_probe = NULL;
3411
3412         return 0;
3413 }
3414
3415 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3416  * that some drivers can provide 32bit values only.
3417  */
3418 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3419                             const struct rtnl_link_stats64 *_new,
3420                             const struct rtnl_link_stats64 *_old)
3421 {
3422         const u64 *new = (const u64 *)_new;
3423         const u64 *old = (const u64 *)_old;
3424         u64 *res = (u64 *)_res;
3425         int i;
3426
3427         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3428                 u64 nv = new[i];
3429                 u64 ov = old[i];
3430                 s64 delta = nv - ov;
3431
3432                 /* detects if this particular field is 32bit only */
3433                 if (((nv | ov) >> 32) == 0)
3434                         delta = (s64)(s32)((u32)nv - (u32)ov);
3435
3436                 /* filter anomalies, some drivers reset their stats
3437                  * at down/up events.
3438                  */
3439                 if (delta > 0)
3440                         res[i] += delta;
3441         }
3442 }
3443
3444 static int bond_get_nest_level(struct net_device *bond_dev)
3445 {
3446         struct bonding *bond = netdev_priv(bond_dev);
3447
3448         return bond->nest_level;
3449 }
3450
3451 static void bond_get_stats(struct net_device *bond_dev,
3452                            struct rtnl_link_stats64 *stats)
3453 {
3454         struct bonding *bond = netdev_priv(bond_dev);
3455         struct rtnl_link_stats64 temp;
3456         struct list_head *iter;
3457         struct slave *slave;
3458
3459         spin_lock_nested(&bond->stats_lock, bond_get_nest_level(bond_dev));
3460         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3461
3462         rcu_read_lock();
3463         bond_for_each_slave_rcu(bond, slave, iter) {
3464                 const struct rtnl_link_stats64 *new =
3465                         dev_get_stats(slave->dev, &temp);
3466
3467                 bond_fold_stats(stats, new, &slave->slave_stats);
3468
3469                 /* save off the slave stats for the next run */
3470                 memcpy(&slave->slave_stats, new, sizeof(*new));
3471         }
3472         rcu_read_unlock();
3473
3474         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3475         spin_unlock(&bond->stats_lock);
3476 }
3477
3478 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3479 {
3480         struct bonding *bond = netdev_priv(bond_dev);
3481         struct net_device *slave_dev = NULL;
3482         struct ifbond k_binfo;
3483         struct ifbond __user *u_binfo = NULL;
3484         struct ifslave k_sinfo;
3485         struct ifslave __user *u_sinfo = NULL;
3486         struct mii_ioctl_data *mii = NULL;
3487         struct bond_opt_value newval;
3488         struct net *net;
3489         int res = 0;
3490
3491         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3492
3493         switch (cmd) {
3494         case SIOCGMIIPHY:
3495                 mii = if_mii(ifr);
3496                 if (!mii)
3497                         return -EINVAL;
3498
3499                 mii->phy_id = 0;
3500                 /* Fall Through */
3501         case SIOCGMIIREG:
3502                 /* We do this again just in case we were called by SIOCGMIIREG
3503                  * instead of SIOCGMIIPHY.
3504                  */
3505                 mii = if_mii(ifr);
3506                 if (!mii)
3507                         return -EINVAL;
3508
3509                 if (mii->reg_num == 1) {
3510                         mii->val_out = 0;
3511                         if (netif_carrier_ok(bond->dev))
3512                                 mii->val_out = BMSR_LSTATUS;
3513                 }
3514
3515                 return 0;
3516         case BOND_INFO_QUERY_OLD:
3517         case SIOCBONDINFOQUERY:
3518                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3519
3520                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3521                         return -EFAULT;
3522
3523                 bond_info_query(bond_dev, &k_binfo);
3524                 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3525                         return -EFAULT;
3526
3527                 return 0;
3528         case BOND_SLAVE_INFO_QUERY_OLD:
3529         case SIOCBONDSLAVEINFOQUERY:
3530                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3531
3532                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3533                         return -EFAULT;
3534
3535                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3536                 if (res == 0 &&
3537                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3538                         return -EFAULT;
3539
3540                 return res;
3541         default:
3542                 break;
3543         }
3544
3545         net = dev_net(bond_dev);
3546
3547         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3548                 return -EPERM;
3549
3550         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3551
3552         netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3553
3554         if (!slave_dev)
3555                 return -ENODEV;
3556
3557         netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3558         switch (cmd) {
3559         case BOND_ENSLAVE_OLD:
3560         case SIOCBONDENSLAVE:
3561                 res = bond_enslave(bond_dev, slave_dev);
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                 bond_set_dev_addr(bond_dev, slave_dev);
3570                 res = 0;
3571                 break;
3572         case BOND_CHANGE_ACTIVE_OLD:
3573         case SIOCBONDCHANGEACTIVE:
3574                 bond_opt_initstr(&newval, slave_dev->name);
3575                 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3576                                             &newval);
3577                 break;
3578         default:
3579                 res = -EOPNOTSUPP;
3580         }
3581
3582         return res;
3583 }
3584
3585 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3586 {
3587         struct bonding *bond = netdev_priv(bond_dev);
3588
3589         if (change & IFF_PROMISC)
3590                 bond_set_promiscuity(bond,
3591                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3592
3593         if (change & IFF_ALLMULTI)
3594                 bond_set_allmulti(bond,
3595                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3596 }
3597
3598 static void bond_set_rx_mode(struct net_device *bond_dev)
3599 {
3600         struct bonding *bond = netdev_priv(bond_dev);
3601         struct list_head *iter;
3602         struct slave *slave;
3603
3604         rcu_read_lock();
3605         if (bond_uses_primary(bond)) {
3606                 slave = rcu_dereference(bond->curr_active_slave);
3607                 if (slave) {
3608                         dev_uc_sync(slave->dev, bond_dev);
3609                         dev_mc_sync(slave->dev, bond_dev);
3610                 }
3611         } else {
3612                 bond_for_each_slave_rcu(bond, slave, iter) {
3613                         dev_uc_sync_multiple(slave->dev, bond_dev);
3614                         dev_mc_sync_multiple(slave->dev, bond_dev);
3615                 }
3616         }
3617         rcu_read_unlock();
3618 }
3619
3620 static int bond_neigh_init(struct neighbour *n)
3621 {
3622         struct bonding *bond = netdev_priv(n->dev);
3623         const struct net_device_ops *slave_ops;
3624         struct neigh_parms parms;
3625         struct slave *slave;
3626         int ret;
3627
3628         slave = bond_first_slave(bond);
3629         if (!slave)
3630                 return 0;
3631         slave_ops = slave->dev->netdev_ops;
3632         if (!slave_ops->ndo_neigh_setup)
3633                 return 0;
3634
3635         parms.neigh_setup = NULL;
3636         parms.neigh_cleanup = NULL;
3637         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3638         if (ret)
3639                 return ret;
3640
3641         /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3642          * after the last slave has been detached.  Assumes that all slaves
3643          * utilize the same neigh_cleanup (true at this writing as only user
3644          * is ipoib).
3645          */
3646         n->parms->neigh_cleanup = parms.neigh_cleanup;
3647
3648         if (!parms.neigh_setup)
3649                 return 0;
3650
3651         return parms.neigh_setup(n);
3652 }
3653
3654 /* The bonding ndo_neigh_setup is called at init time beofre any
3655  * slave exists. So we must declare proxy setup function which will
3656  * be used at run time to resolve the actual slave neigh param setup.
3657  *
3658  * It's also called by master devices (such as vlans) to setup their
3659  * underlying devices. In that case - do nothing, we're already set up from
3660  * our init.
3661  */
3662 static int bond_neigh_setup(struct net_device *dev,
3663                             struct neigh_parms *parms)
3664 {
3665         /* modify only our neigh_parms */
3666         if (parms->dev == dev)
3667                 parms->neigh_setup = bond_neigh_init;
3668
3669         return 0;
3670 }
3671
3672 /* Change the MTU of all of a master's slaves to match the master */
3673 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3674 {
3675         struct bonding *bond = netdev_priv(bond_dev);
3676         struct slave *slave, *rollback_slave;
3677         struct list_head *iter;
3678         int res = 0;
3679
3680         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3681
3682         bond_for_each_slave(bond, slave, iter) {
3683                 netdev_dbg(bond_dev, "s %p c_m %p\n",
3684                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3685
3686                 res = dev_set_mtu(slave->dev, new_mtu);
3687
3688                 if (res) {
3689                         /* If we failed to set the slave's mtu to the new value
3690                          * we must abort the operation even in ACTIVE_BACKUP
3691                          * mode, because if we allow the backup slaves to have
3692                          * different mtu values than the active slave we'll
3693                          * need to change their mtu when doing a failover. That
3694                          * means changing their mtu from timer context, which
3695                          * is probably not a good idea.
3696                          */
3697                         netdev_dbg(bond_dev, "err %d %s\n", res,
3698                                    slave->dev->name);
3699                         goto unwind;
3700                 }
3701         }
3702
3703         bond_dev->mtu = new_mtu;
3704
3705         return 0;
3706
3707 unwind:
3708         /* unwind from head to the slave that failed */
3709         bond_for_each_slave(bond, rollback_slave, iter) {
3710                 int tmp_res;
3711
3712                 if (rollback_slave == slave)
3713                         break;
3714
3715                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3716                 if (tmp_res) {
3717                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3718                                    tmp_res, rollback_slave->dev->name);
3719                 }
3720         }
3721
3722         return res;
3723 }
3724
3725 /* Change HW address
3726  *
3727  * Note that many devices must be down to change the HW address, and
3728  * downing the master releases all slaves.  We can make bonds full of
3729  * bonding devices to test this, however.
3730  */
3731 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3732 {
3733         struct bonding *bond = netdev_priv(bond_dev);
3734         struct slave *slave, *rollback_slave;
3735         struct sockaddr_storage *ss = addr, tmp_ss;
3736         struct list_head *iter;
3737         int res = 0;
3738
3739         if (BOND_MODE(bond) == BOND_MODE_ALB)
3740                 return bond_alb_set_mac_address(bond_dev, addr);
3741
3742
3743         netdev_dbg(bond_dev, "bond=%p\n", bond);
3744
3745         /* If fail_over_mac is enabled, do nothing and return success.
3746          * Returning an error causes ifenslave to fail.
3747          */
3748         if (bond->params.fail_over_mac &&
3749             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3750                 return 0;
3751
3752         if (!is_valid_ether_addr(ss->__data))
3753                 return -EADDRNOTAVAIL;
3754
3755         bond_for_each_slave(bond, slave, iter) {
3756                 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3757                 res = dev_set_mac_address(slave->dev, addr);
3758                 if (res) {
3759                         /* TODO: consider downing the slave
3760                          * and retry ?
3761                          * User should expect communications
3762                          * breakage anyway until ARP finish
3763                          * updating, so...
3764                          */
3765                         netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
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);
3787                 if (tmp_res) {
3788                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3789                                    tmp_res, rollback_slave->dev->name);
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 int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3870 {
3871         struct bonding *bond = netdev_priv(bond_dev);
3872         struct slave *slave;
3873         int slave_cnt;
3874         u32 slave_id;
3875
3876         /* Start with the curr_active_slave that joined the bond as the
3877          * default for sending IGMP traffic.  For failover purposes one
3878          * needs to maintain some consistency for the interface that will
3879          * send the join/membership reports.  The curr_active_slave found
3880          * will send all of this type of traffic.
3881          */
3882         if (skb->protocol == htons(ETH_P_IP)) {
3883                 int noff = skb_network_offset(skb);
3884                 struct iphdr *iph;
3885
3886                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3887                         goto non_igmp;
3888
3889                 iph = ip_hdr(skb);
3890                 if (iph->protocol == IPPROTO_IGMP) {
3891                         slave = rcu_dereference(bond->curr_active_slave);
3892                         if (slave)
3893                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3894                         else
3895                                 bond_xmit_slave_id(bond, skb, 0);
3896                         return NETDEV_TX_OK;
3897                 }
3898         }
3899
3900 non_igmp:
3901         slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3902         if (likely(slave_cnt)) {
3903                 slave_id = bond_rr_gen_slave_id(bond);
3904                 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3905         } else {
3906                 bond_tx_drop(bond_dev, skb);
3907         }
3908         return NETDEV_TX_OK;
3909 }
3910
3911 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3912  * the bond has a usable interface.
3913  */
3914 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3915 {
3916         struct bonding *bond = netdev_priv(bond_dev);
3917         struct slave *slave;
3918
3919         slave = rcu_dereference(bond->curr_active_slave);
3920         if (slave)
3921                 bond_dev_queue_xmit(bond, skb, slave->dev);
3922         else
3923                 bond_tx_drop(bond_dev, skb);
3924
3925         return NETDEV_TX_OK;
3926 }
3927
3928 /* Use this to update slave_array when (a) it's not appropriate to update
3929  * slave_array right away (note that update_slave_array() may sleep)
3930  * and / or (b) RTNL is not held.
3931  */
3932 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3933 {
3934         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3935 }
3936
3937 /* Slave array work handler. Holds only RTNL */
3938 static void bond_slave_arr_handler(struct work_struct *work)
3939 {
3940         struct bonding *bond = container_of(work, struct bonding,
3941                                             slave_arr_work.work);
3942         int ret;
3943
3944         if (!rtnl_trylock())
3945                 goto err;
3946
3947         ret = bond_update_slave_arr(bond, NULL);
3948         rtnl_unlock();
3949         if (ret) {
3950                 pr_warn_ratelimited("Failed to update slave array from WT\n");
3951                 goto err;
3952         }
3953         return;
3954
3955 err:
3956         bond_slave_arr_work_rearm(bond, 1);
3957 }
3958
3959 /* Build the usable slaves array in control path for modes that use xmit-hash
3960  * to determine the slave interface -
3961  * (a) BOND_MODE_8023AD
3962  * (b) BOND_MODE_XOR
3963  * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3964  *
3965  * The caller is expected to hold RTNL only and NO other lock!
3966  */
3967 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3968 {
3969         struct slave *slave;
3970         struct list_head *iter;
3971         struct bond_up_slave *new_arr, *old_arr;
3972         int agg_id = 0;
3973         int ret = 0;
3974
3975 #ifdef CONFIG_LOCKDEP
3976         WARN_ON(lockdep_is_held(&bond->mode_lock));
3977 #endif
3978
3979         new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3980                           GFP_KERNEL);
3981         if (!new_arr) {
3982                 ret = -ENOMEM;
3983                 pr_err("Failed to build slave-array.\n");
3984                 goto out;
3985         }
3986         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3987                 struct ad_info ad_info;
3988
3989                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3990                         pr_debug("bond_3ad_get_active_agg_info failed\n");
3991                         kfree_rcu(new_arr, rcu);
3992                         /* No active aggragator means it's not safe to use
3993                          * the previous array.
3994                          */
3995                         old_arr = rtnl_dereference(bond->slave_arr);
3996                         if (old_arr) {
3997                                 RCU_INIT_POINTER(bond->slave_arr, NULL);
3998                                 kfree_rcu(old_arr, rcu);
3999                         }
4000                         goto out;
4001                 }
4002                 agg_id = ad_info.aggregator_id;
4003         }
4004         bond_for_each_slave(bond, slave, iter) {
4005                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4006                         struct aggregator *agg;
4007
4008                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
4009                         if (!agg || agg->aggregator_identifier != agg_id)
4010                                 continue;
4011                 }
4012                 if (!bond_slave_can_tx(slave))
4013                         continue;
4014                 if (skipslave == slave)
4015                         continue;
4016                 new_arr->arr[new_arr->count++] = slave;
4017         }
4018
4019         old_arr = rtnl_dereference(bond->slave_arr);
4020         rcu_assign_pointer(bond->slave_arr, new_arr);
4021         if (old_arr)
4022                 kfree_rcu(old_arr, rcu);
4023 out:
4024         if (ret != 0 && skipslave) {
4025                 int idx;
4026
4027                 /* Rare situation where caller has asked to skip a specific
4028                  * slave but allocation failed (most likely!). BTW this is
4029                  * only possible when the call is initiated from
4030                  * __bond_release_one(). In this situation; overwrite the
4031                  * skipslave entry in the array with the last entry from the
4032                  * array to avoid a situation where the xmit path may choose
4033                  * this to-be-skipped slave to send a packet out.
4034                  */
4035                 old_arr = rtnl_dereference(bond->slave_arr);
4036                 for (idx = 0; old_arr != NULL && idx < old_arr->count; idx++) {
4037                         if (skipslave == old_arr->arr[idx]) {
4038                                 old_arr->arr[idx] =
4039                                     old_arr->arr[old_arr->count-1];
4040                                 old_arr->count--;
4041                                 break;
4042                         }
4043                 }
4044         }
4045         return ret;
4046 }
4047
4048 /* Use this Xmit function for 3AD as well as XOR modes. The current
4049  * usable slave array is formed in the control path. The xmit function
4050  * just calculates hash and sends the packet out.
4051  */
4052 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
4053 {
4054         struct bonding *bond = netdev_priv(dev);
4055         struct slave *slave;
4056         struct bond_up_slave *slaves;
4057         unsigned int count;
4058
4059         slaves = rcu_dereference(bond->slave_arr);
4060         count = slaves ? ACCESS_ONCE(slaves->count) : 0;
4061         if (likely(count)) {
4062                 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
4063                 bond_dev_queue_xmit(bond, skb, slave->dev);
4064         } else {
4065                 bond_tx_drop(dev, skb);
4066         }
4067
4068         return NETDEV_TX_OK;
4069 }
4070
4071 /* in broadcast mode, we send everything to all usable interfaces. */
4072 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4073 {
4074         struct bonding *bond = netdev_priv(bond_dev);
4075         struct slave *slave = NULL;
4076         struct list_head *iter;
4077
4078         bond_for_each_slave_rcu(bond, slave, iter) {
4079                 if (bond_is_last_slave(bond, slave))
4080                         break;
4081                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4082                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4083
4084                         if (!skb2) {
4085                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4086                                                     bond_dev->name, __func__);
4087                                 continue;
4088                         }
4089                         bond_dev_queue_xmit(bond, skb2, slave->dev);
4090                 }
4091         }
4092         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4093                 bond_dev_queue_xmit(bond, skb, slave->dev);
4094         else
4095                 bond_tx_drop(bond_dev, skb);
4096
4097         return NETDEV_TX_OK;
4098 }
4099
4100 /*------------------------- Device initialization ---------------------------*/
4101
4102 /* Lookup the slave that corresponds to a qid */
4103 static inline int bond_slave_override(struct bonding *bond,
4104                                       struct sk_buff *skb)
4105 {
4106         struct slave *slave = NULL;
4107         struct list_head *iter;
4108
4109         if (!skb->queue_mapping)
4110                 return 1;
4111
4112         /* Find out if any slaves have the same mapping as this skb. */
4113         bond_for_each_slave_rcu(bond, slave, iter) {
4114                 if (slave->queue_id == skb->queue_mapping) {
4115                         if (bond_slave_is_up(slave) &&
4116                             slave->link == BOND_LINK_UP) {
4117                                 bond_dev_queue_xmit(bond, skb, slave->dev);
4118                                 return 0;
4119                         }
4120                         /* If the slave isn't UP, use default transmit policy. */
4121                         break;
4122                 }
4123         }
4124
4125         return 1;
4126 }
4127
4128
4129 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4130                              void *accel_priv, select_queue_fallback_t fallback)
4131 {
4132         /* This helper function exists to help dev_pick_tx get the correct
4133          * destination queue.  Using a helper function skips a call to
4134          * skb_tx_hash and will put the skbs in the queue we expect on their
4135          * way down to the bonding driver.
4136          */
4137         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4138
4139         /* Save the original txq to restore before passing to the driver */
4140         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4141
4142         if (unlikely(txq >= dev->real_num_tx_queues)) {
4143                 do {
4144                         txq -= dev->real_num_tx_queues;
4145                 } while (txq >= dev->real_num_tx_queues);
4146         }
4147         return txq;
4148 }
4149
4150 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4151 {
4152         struct bonding *bond = netdev_priv(dev);
4153
4154         if (bond_should_override_tx_queue(bond) &&
4155             !bond_slave_override(bond, skb))
4156                 return NETDEV_TX_OK;
4157
4158         switch (BOND_MODE(bond)) {
4159         case BOND_MODE_ROUNDROBIN:
4160                 return bond_xmit_roundrobin(skb, dev);
4161         case BOND_MODE_ACTIVEBACKUP:
4162                 return bond_xmit_activebackup(skb, dev);
4163         case BOND_MODE_8023AD:
4164         case BOND_MODE_XOR:
4165                 return bond_3ad_xor_xmit(skb, dev);
4166         case BOND_MODE_BROADCAST:
4167                 return bond_xmit_broadcast(skb, dev);
4168         case BOND_MODE_ALB:
4169                 return bond_alb_xmit(skb, dev);
4170         case BOND_MODE_TLB:
4171                 return bond_tlb_xmit(skb, dev);
4172         default:
4173                 /* Should never happen, mode already checked */
4174                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4175                 WARN_ON_ONCE(1);
4176                 bond_tx_drop(dev, skb);
4177                 return NETDEV_TX_OK;
4178         }
4179 }
4180
4181 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4182 {
4183         struct bonding *bond = netdev_priv(dev);
4184         netdev_tx_t ret = NETDEV_TX_OK;
4185
4186         /* If we risk deadlock from transmitting this in the
4187          * netpoll path, tell netpoll to queue the frame for later tx
4188          */
4189         if (unlikely(is_netpoll_tx_blocked(dev)))
4190                 return NETDEV_TX_BUSY;
4191
4192         rcu_read_lock();
4193         if (bond_has_slaves(bond))
4194                 ret = __bond_start_xmit(skb, dev);
4195         else
4196                 bond_tx_drop(dev, skb);
4197         rcu_read_unlock();
4198
4199         return ret;
4200 }
4201
4202 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
4203 {
4204         if (speed == 0 || speed == SPEED_UNKNOWN)
4205                 speed = slave->speed;
4206         else
4207                 speed = min(speed, slave->speed);
4208
4209         return speed;
4210 }
4211
4212 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4213                                            struct ethtool_link_ksettings *cmd)
4214 {
4215         struct bonding *bond = netdev_priv(bond_dev);
4216         struct list_head *iter;
4217         struct slave *slave;
4218         u32 speed = 0;
4219
4220         cmd->base.duplex = DUPLEX_UNKNOWN;
4221         cmd->base.port = PORT_OTHER;
4222
4223         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4224          * do not need to check mode.  Though link speed might not represent
4225          * the true receive or transmit bandwidth (not all modes are symmetric)
4226          * this is an accurate maximum.
4227          */
4228         bond_for_each_slave(bond, slave, iter) {
4229                 if (bond_slave_can_tx(slave)) {
4230                         if (slave->speed != SPEED_UNKNOWN) {
4231                                 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
4232                                         speed = bond_mode_bcast_speed(slave,
4233                                                                       speed);
4234                                 else
4235                                         speed += slave->speed;
4236                         }
4237                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4238                             slave->duplex != DUPLEX_UNKNOWN)
4239                                 cmd->base.duplex = slave->duplex;
4240                 }
4241         }
4242         cmd->base.speed = speed ? : SPEED_UNKNOWN;
4243
4244         return 0;
4245 }
4246
4247 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4248                                      struct ethtool_drvinfo *drvinfo)
4249 {
4250         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4251         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4252         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4253                  BOND_ABI_VERSION);
4254 }
4255
4256 static const struct ethtool_ops bond_ethtool_ops = {
4257         .get_drvinfo            = bond_ethtool_get_drvinfo,
4258         .get_link               = ethtool_op_get_link,
4259         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4260 };
4261
4262 static const struct net_device_ops bond_netdev_ops = {
4263         .ndo_init               = bond_init,
4264         .ndo_uninit             = bond_uninit,
4265         .ndo_open               = bond_open,
4266         .ndo_stop               = bond_close,
4267         .ndo_start_xmit         = bond_start_xmit,
4268         .ndo_select_queue       = bond_select_queue,
4269         .ndo_get_stats64        = bond_get_stats,
4270         .ndo_do_ioctl           = bond_do_ioctl,
4271         .ndo_change_rx_flags    = bond_change_rx_flags,
4272         .ndo_set_rx_mode        = bond_set_rx_mode,
4273         .ndo_change_mtu         = bond_change_mtu,
4274         .ndo_set_mac_address    = bond_set_mac_address,
4275         .ndo_neigh_setup        = bond_neigh_setup,
4276         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4277         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4278         .ndo_get_lock_subclass  = bond_get_nest_level,
4279 #ifdef CONFIG_NET_POLL_CONTROLLER
4280         .ndo_netpoll_setup      = bond_netpoll_setup,
4281         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4282         .ndo_poll_controller    = bond_poll_controller,
4283 #endif
4284         .ndo_add_slave          = bond_enslave,
4285         .ndo_del_slave          = bond_release,
4286         .ndo_fix_features       = bond_fix_features,
4287         .ndo_features_check     = passthru_features_check,
4288 };
4289
4290 static const struct device_type bond_type = {
4291         .name = "bond",
4292 };
4293
4294 static void bond_destructor(struct net_device *bond_dev)
4295 {
4296         struct bonding *bond = netdev_priv(bond_dev);
4297         if (bond->wq)
4298                 destroy_workqueue(bond->wq);
4299 }
4300
4301 void bond_setup(struct net_device *bond_dev)
4302 {
4303         struct bonding *bond = netdev_priv(bond_dev);
4304
4305         spin_lock_init(&bond->mode_lock);
4306         spin_lock_init(&bond->stats_lock);
4307         bond->params = bonding_defaults;
4308
4309         /* Initialize pointers */
4310         bond->dev = bond_dev;
4311
4312         /* Initialize the device entry points */
4313         ether_setup(bond_dev);
4314         bond_dev->max_mtu = ETH_MAX_MTU;
4315         bond_dev->netdev_ops = &bond_netdev_ops;
4316         bond_dev->ethtool_ops = &bond_ethtool_ops;
4317
4318         bond_dev->needs_free_netdev = true;
4319         bond_dev->priv_destructor = bond_destructor;
4320
4321         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4322
4323         /* Initialize the device options */
4324         bond_dev->flags |= IFF_MASTER;
4325         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4326         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4327
4328         /* don't acquire bond device's netif_tx_lock when transmitting */
4329         bond_dev->features |= NETIF_F_LLTX;
4330
4331         /* By default, we declare the bond to be fully
4332          * VLAN hardware accelerated capable. Special
4333          * care is taken in the various xmit functions
4334          * when there are slaves that are not hw accel
4335          * capable
4336          */
4337
4338         /* Don't allow bond devices to change network namespaces. */
4339         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4340
4341         bond_dev->hw_features = BOND_VLAN_FEATURES |
4342                                 NETIF_F_HW_VLAN_CTAG_RX |
4343                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4344
4345         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4346         bond_dev->features |= bond_dev->hw_features;
4347         bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX;
4348 }
4349
4350 /* Destroy a bonding device.
4351  * Must be under rtnl_lock when this function is called.
4352  */
4353 static void bond_uninit(struct net_device *bond_dev)
4354 {
4355         struct bonding *bond = netdev_priv(bond_dev);
4356         struct list_head *iter;
4357         struct slave *slave;
4358         struct bond_up_slave *arr;
4359
4360         bond_netpoll_cleanup(bond_dev);
4361
4362         /* Release the bonded slaves */
4363         bond_for_each_slave(bond, slave, iter)
4364                 __bond_release_one(bond_dev, slave->dev, true, true);
4365         netdev_info(bond_dev, "Released all slaves\n");
4366
4367         arr = rtnl_dereference(bond->slave_arr);
4368         if (arr) {
4369                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4370                 kfree_rcu(arr, rcu);
4371         }
4372
4373         list_del(&bond->bond_list);
4374
4375         bond_debug_unregister(bond);
4376 }
4377
4378 /*------------------------- Module initialization ---------------------------*/
4379
4380 static int bond_check_params(struct bond_params *params)
4381 {
4382         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4383         struct bond_opt_value newval;
4384         const struct bond_opt_value *valptr;
4385         int arp_all_targets_value = 0;
4386         u16 ad_actor_sys_prio = 0;
4387         u16 ad_user_port_key = 0;
4388         __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4389         int arp_ip_count;
4390         int bond_mode   = BOND_MODE_ROUNDROBIN;
4391         int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4392         int lacp_fast = 0;
4393         int tlb_dynamic_lb;
4394
4395         /* Convert string parameters. */
4396         if (mode) {
4397                 bond_opt_initstr(&newval, mode);
4398                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4399                 if (!valptr) {
4400                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4401                         return -EINVAL;
4402                 }
4403                 bond_mode = valptr->value;
4404         }
4405
4406         if (xmit_hash_policy) {
4407                 if ((bond_mode != BOND_MODE_XOR) &&
4408                     (bond_mode != BOND_MODE_8023AD) &&
4409                     (bond_mode != BOND_MODE_TLB)) {
4410                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4411                                 bond_mode_name(bond_mode));
4412                 } else {
4413                         bond_opt_initstr(&newval, xmit_hash_policy);
4414                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4415                                                 &newval);
4416                         if (!valptr) {
4417                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4418                                        xmit_hash_policy);
4419                                 return -EINVAL;
4420                         }
4421                         xmit_hashtype = valptr->value;
4422                 }
4423         }
4424
4425         if (lacp_rate) {
4426                 if (bond_mode != BOND_MODE_8023AD) {
4427                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4428                                 bond_mode_name(bond_mode));
4429                 } else {
4430                         bond_opt_initstr(&newval, lacp_rate);
4431                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4432                                                 &newval);
4433                         if (!valptr) {
4434                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4435                                        lacp_rate);
4436                                 return -EINVAL;
4437                         }
4438                         lacp_fast = valptr->value;
4439                 }
4440         }
4441
4442         if (ad_select) {
4443                 bond_opt_initstr(&newval, ad_select);
4444                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4445                                         &newval);
4446                 if (!valptr) {
4447                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4448                         return -EINVAL;
4449                 }
4450                 params->ad_select = valptr->value;
4451                 if (bond_mode != BOND_MODE_8023AD)
4452                         pr_warn("ad_select param only affects 802.3ad mode\n");
4453         } else {
4454                 params->ad_select = BOND_AD_STABLE;
4455         }
4456
4457         if (max_bonds < 0) {
4458                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4459                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4460                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4461         }
4462
4463         if (miimon < 0) {
4464                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4465                         miimon, INT_MAX);
4466                 miimon = 0;
4467         }
4468
4469         if (updelay < 0) {
4470                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4471                         updelay, INT_MAX);
4472                 updelay = 0;
4473         }
4474
4475         if (downdelay < 0) {
4476                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4477                         downdelay, INT_MAX);
4478                 downdelay = 0;
4479         }
4480
4481         if ((use_carrier != 0) && (use_carrier != 1)) {
4482                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4483                         use_carrier);
4484                 use_carrier = 1;
4485         }
4486
4487         if (num_peer_notif < 0 || num_peer_notif > 255) {
4488                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4489                         num_peer_notif);
4490                 num_peer_notif = 1;
4491         }
4492
4493         /* reset values for 802.3ad/TLB/ALB */
4494         if (!bond_mode_uses_arp(bond_mode)) {
4495                 if (!miimon) {
4496                         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");
4497                         pr_warn("Forcing miimon to 100msec\n");
4498                         miimon = BOND_DEFAULT_MIIMON;
4499                 }
4500         }
4501
4502         if (tx_queues < 1 || tx_queues > 255) {
4503                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4504                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4505                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4506         }
4507
4508         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4509                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4510                         all_slaves_active);
4511                 all_slaves_active = 0;
4512         }
4513
4514         if (resend_igmp < 0 || resend_igmp > 255) {
4515                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4516                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4517                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4518         }
4519
4520         bond_opt_initval(&newval, packets_per_slave);
4521         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4522                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4523                         packets_per_slave, USHRT_MAX);
4524                 packets_per_slave = 1;
4525         }
4526
4527         if (bond_mode == BOND_MODE_ALB) {
4528                 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",
4529                           updelay);
4530         }
4531
4532         if (!miimon) {
4533                 if (updelay || downdelay) {
4534                         /* just warn the user the up/down delay will have
4535                          * no effect since miimon is zero...
4536                          */
4537                         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",
4538                                 updelay, downdelay);
4539                 }
4540         } else {
4541                 /* don't allow arp monitoring */
4542                 if (arp_interval) {
4543                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4544                                 miimon, arp_interval);
4545                         arp_interval = 0;
4546                 }
4547
4548                 if ((updelay % miimon) != 0) {
4549                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4550                                 updelay, miimon, (updelay / miimon) * miimon);
4551                 }
4552
4553                 updelay /= miimon;
4554
4555                 if ((downdelay % miimon) != 0) {
4556                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4557                                 downdelay, miimon,
4558                                 (downdelay / miimon) * miimon);
4559                 }
4560
4561                 downdelay /= miimon;
4562         }
4563
4564         if (arp_interval < 0) {
4565                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4566                         arp_interval, INT_MAX);
4567                 arp_interval = 0;
4568         }
4569
4570         for (arp_ip_count = 0, i = 0;
4571              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4572                 __be32 ip;
4573
4574                 /* not a complete check, but good enough to catch mistakes */
4575                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4576                     !bond_is_ip_target_ok(ip)) {
4577                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4578                                 arp_ip_target[i]);
4579                         arp_interval = 0;
4580                 } else {
4581                         if (bond_get_targets_ip(arp_target, ip) == -1)
4582                                 arp_target[arp_ip_count++] = ip;
4583                         else
4584                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4585                                         &ip);
4586                 }
4587         }
4588
4589         if (arp_interval && !arp_ip_count) {
4590                 /* don't allow arping if no arp_ip_target given... */
4591                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4592                         arp_interval);
4593                 arp_interval = 0;
4594         }
4595
4596         if (arp_validate) {
4597                 if (!arp_interval) {
4598                         pr_err("arp_validate requires arp_interval\n");
4599                         return -EINVAL;
4600                 }
4601
4602                 bond_opt_initstr(&newval, arp_validate);
4603                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4604                                         &newval);
4605                 if (!valptr) {
4606                         pr_err("Error: invalid arp_validate \"%s\"\n",
4607                                arp_validate);
4608                         return -EINVAL;
4609                 }
4610                 arp_validate_value = valptr->value;
4611         } else {
4612                 arp_validate_value = 0;
4613         }
4614
4615         if (arp_all_targets) {
4616                 bond_opt_initstr(&newval, arp_all_targets);
4617                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4618                                         &newval);
4619                 if (!valptr) {
4620                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4621                                arp_all_targets);
4622                         arp_all_targets_value = 0;
4623                 } else {
4624                         arp_all_targets_value = valptr->value;
4625                 }
4626         }
4627
4628         if (miimon) {
4629                 pr_info("MII link monitoring set to %d ms\n", miimon);
4630         } else if (arp_interval) {
4631                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4632                                           arp_validate_value);
4633                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4634                         arp_interval, valptr->string, arp_ip_count);
4635
4636                 for (i = 0; i < arp_ip_count; i++)
4637                         pr_cont(" %s", arp_ip_target[i]);
4638
4639                 pr_cont("\n");
4640
4641         } else if (max_bonds) {
4642                 /* miimon and arp_interval not set, we need one so things
4643                  * work as expected, see bonding.txt for details
4644                  */
4645                 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");
4646         }
4647
4648         if (primary && !bond_mode_uses_primary(bond_mode)) {
4649                 /* currently, using a primary only makes sense
4650                  * in active backup, TLB or ALB modes
4651                  */
4652                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4653                         primary, bond_mode_name(bond_mode));
4654                 primary = NULL;
4655         }
4656
4657         if (primary && primary_reselect) {
4658                 bond_opt_initstr(&newval, primary_reselect);
4659                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4660                                         &newval);
4661                 if (!valptr) {
4662                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4663                                primary_reselect);
4664                         return -EINVAL;
4665                 }
4666                 primary_reselect_value = valptr->value;
4667         } else {
4668                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4669         }
4670
4671         if (fail_over_mac) {
4672                 bond_opt_initstr(&newval, fail_over_mac);
4673                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4674                                         &newval);
4675                 if (!valptr) {
4676                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4677                                fail_over_mac);
4678                         return -EINVAL;
4679                 }
4680                 fail_over_mac_value = valptr->value;
4681                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4682                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4683         } else {
4684                 fail_over_mac_value = BOND_FOM_NONE;
4685         }
4686
4687         bond_opt_initstr(&newval, "default");
4688         valptr = bond_opt_parse(
4689                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4690                                      &newval);
4691         if (!valptr) {
4692                 pr_err("Error: No ad_actor_sys_prio default value");
4693                 return -EINVAL;
4694         }
4695         ad_actor_sys_prio = valptr->value;
4696
4697         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4698                                 &newval);
4699         if (!valptr) {
4700                 pr_err("Error: No ad_user_port_key default value");
4701                 return -EINVAL;
4702         }
4703         ad_user_port_key = valptr->value;
4704
4705         bond_opt_initstr(&newval, "default");
4706         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
4707         if (!valptr) {
4708                 pr_err("Error: No tlb_dynamic_lb default value");
4709                 return -EINVAL;
4710         }
4711         tlb_dynamic_lb = valptr->value;
4712
4713         if (lp_interval == 0) {
4714                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4715                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4716                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4717         }
4718
4719         /* fill params struct with the proper values */
4720         params->mode = bond_mode;
4721         params->xmit_policy = xmit_hashtype;
4722         params->miimon = miimon;
4723         params->num_peer_notif = num_peer_notif;
4724         params->arp_interval = arp_interval;
4725         params->arp_validate = arp_validate_value;
4726         params->arp_all_targets = arp_all_targets_value;
4727         params->updelay = updelay;
4728         params->downdelay = downdelay;
4729         params->use_carrier = use_carrier;
4730         params->lacp_fast = lacp_fast;
4731         params->primary[0] = 0;
4732         params->primary_reselect = primary_reselect_value;
4733         params->fail_over_mac = fail_over_mac_value;
4734         params->tx_queues = tx_queues;
4735         params->all_slaves_active = all_slaves_active;
4736         params->resend_igmp = resend_igmp;
4737         params->min_links = min_links;
4738         params->lp_interval = lp_interval;
4739         params->packets_per_slave = packets_per_slave;
4740         params->tlb_dynamic_lb = tlb_dynamic_lb;
4741         params->ad_actor_sys_prio = ad_actor_sys_prio;
4742         eth_zero_addr(params->ad_actor_system);
4743         params->ad_user_port_key = ad_user_port_key;
4744         if (packets_per_slave > 0) {
4745                 params->reciprocal_packets_per_slave =
4746                         reciprocal_value(packets_per_slave);
4747         } else {
4748                 /* reciprocal_packets_per_slave is unused if
4749                  * packets_per_slave is 0 or 1, just initialize it
4750                  */
4751                 params->reciprocal_packets_per_slave =
4752                         (struct reciprocal_value) { 0 };
4753         }
4754
4755         if (primary) {
4756                 strncpy(params->primary, primary, IFNAMSIZ);
4757                 params->primary[IFNAMSIZ - 1] = 0;
4758         }
4759
4760         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4761
4762         return 0;
4763 }
4764
4765 /* Called from registration process */
4766 static int bond_init(struct net_device *bond_dev)
4767 {
4768         struct bonding *bond = netdev_priv(bond_dev);
4769         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4770
4771         netdev_dbg(bond_dev, "Begin bond_init\n");
4772
4773         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4774         if (!bond->wq)
4775                 return -ENOMEM;
4776
4777         bond->nest_level = SINGLE_DEPTH_NESTING;
4778         netdev_lockdep_set_classes(bond_dev);
4779
4780         list_add_tail(&bond->bond_list, &bn->dev_list);
4781
4782         bond_prepare_sysfs_group(bond);
4783
4784         bond_debug_register(bond);
4785
4786         /* Ensure valid dev_addr */
4787         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4788             bond_dev->addr_assign_type == NET_ADDR_PERM)
4789                 eth_hw_addr_random(bond_dev);
4790
4791         return 0;
4792 }
4793
4794 unsigned int bond_get_num_tx_queues(void)
4795 {
4796         return tx_queues;
4797 }
4798
4799 /* Create a new bond based on the specified name and bonding parameters.
4800  * If name is NULL, obtain a suitable "bond%d" name for us.
4801  * Caller must NOT hold rtnl_lock; we need to release it here before we
4802  * set up our sysfs entries.
4803  */
4804 int bond_create(struct net *net, const char *name)
4805 {
4806         struct net_device *bond_dev;
4807         struct bonding *bond;
4808         struct alb_bond_info *bond_info;
4809         int res;
4810
4811         rtnl_lock();
4812
4813         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4814                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4815                                    bond_setup, tx_queues);
4816         if (!bond_dev) {
4817                 pr_err("%s: eek! can't alloc netdev!\n", name);
4818                 rtnl_unlock();
4819                 return -ENOMEM;
4820         }
4821
4822         /*
4823          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4824          * It is set to 0 by default which is wrong.
4825          */
4826         bond = netdev_priv(bond_dev);
4827         bond_info = &(BOND_ALB_INFO(bond));
4828         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4829
4830         dev_net_set(bond_dev, net);
4831         bond_dev->rtnl_link_ops = &bond_link_ops;
4832
4833         res = register_netdevice(bond_dev);
4834         if (res < 0) {
4835                 free_netdev(bond_dev);
4836                 rtnl_unlock();
4837
4838                 return res;
4839         }
4840
4841         netif_carrier_off(bond_dev);
4842
4843         bond_work_init_all(bond);
4844
4845         rtnl_unlock();
4846         return 0;
4847 }
4848
4849 static int __net_init bond_net_init(struct net *net)
4850 {
4851         struct bond_net *bn = net_generic(net, bond_net_id);
4852
4853         bn->net = net;
4854         INIT_LIST_HEAD(&bn->dev_list);
4855
4856         bond_create_proc_dir(bn);
4857         bond_create_sysfs(bn);
4858
4859         return 0;
4860 }
4861
4862 static void __net_exit bond_net_exit(struct net *net)
4863 {
4864         struct bond_net *bn = net_generic(net, bond_net_id);
4865         struct bonding *bond, *tmp_bond;
4866         LIST_HEAD(list);
4867
4868         bond_destroy_sysfs(bn);
4869
4870         /* Kill off any bonds created after unregistering bond rtnl ops */
4871         rtnl_lock();
4872         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4873                 unregister_netdevice_queue(bond->dev, &list);
4874         unregister_netdevice_many(&list);
4875         rtnl_unlock();
4876
4877         bond_destroy_proc_dir(bn);
4878 }
4879
4880 static struct pernet_operations bond_net_ops = {
4881         .init = bond_net_init,
4882         .exit = bond_net_exit,
4883         .id   = &bond_net_id,
4884         .size = sizeof(struct bond_net),
4885 };
4886
4887 static int __init bonding_init(void)
4888 {
4889         int i;
4890         int res;
4891
4892         pr_info("%s", bond_version);
4893
4894         res = bond_check_params(&bonding_defaults);
4895         if (res)
4896                 goto out;
4897
4898         res = register_pernet_subsys(&bond_net_ops);
4899         if (res)
4900                 goto out;
4901
4902         res = bond_netlink_init();
4903         if (res)
4904                 goto err_link;
4905
4906         bond_create_debugfs();
4907
4908         for (i = 0; i < max_bonds; i++) {
4909                 res = bond_create(&init_net, NULL);
4910                 if (res)
4911                         goto err;
4912         }
4913
4914         register_netdevice_notifier(&bond_netdev_notifier);
4915 out:
4916         return res;
4917 err:
4918         bond_destroy_debugfs();
4919         bond_netlink_fini();
4920 err_link:
4921         unregister_pernet_subsys(&bond_net_ops);
4922         goto out;
4923
4924 }
4925
4926 static void __exit bonding_exit(void)
4927 {
4928         unregister_netdevice_notifier(&bond_netdev_notifier);
4929
4930         bond_destroy_debugfs();
4931
4932         bond_netlink_fini();
4933         unregister_pernet_subsys(&bond_net_ops);
4934
4935 #ifdef CONFIG_NET_POLL_CONTROLLER
4936         /* Make sure we don't have an imbalance on our netpoll blocking */
4937         WARN_ON(atomic_read(&netpoll_block_tx));
4938 #endif
4939 }
4940
4941 module_init(bonding_init);
4942 module_exit(bonding_exit);
4943 MODULE_LICENSE("GPL");
4944 MODULE_VERSION(DRV_VERSION);
4945 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4946 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");