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