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_keys.h>
  80 #include <net/bonding.h>
  81 #include <net/bond_3ad.h>
  82 #include <net/bond_alb.h>
  83
  84 /*---------------------------- Module parameters ----------------------------*/
  85
  86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  87
  88 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  89 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  90 static int num_peer_notif = 1;
  91 static int miimon;
  92 static int updelay;
  93 static int downdelay;
  94 static int use_carrier  = 1;
  95 static char *mode;
  96 static char *primary;
  97 static char *primary_reselect;
  98 static char *lacp_rate;
  99 static int min_links;
 100 static char *ad_select;
 101 static char *xmit_hash_policy;
 102 static int arp_interval;
 103 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 104 static char *arp_validate;
 105 static char *arp_all_targets;
 106 static char *fail_over_mac;
 107 static int all_slaves_active;
 108 static struct bond_params bonding_defaults;
 109 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 110 static int packets_per_slave = 1;
 111 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 112
 113 module_param(max_bonds, int, 0);
 114 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 115 module_param(tx_queues, int, 0);
 116 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 117 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 118 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 119                                "failover event (alias of num_unsol_na)");
 120 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 121 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 122                                "failover event (alias of num_grat_arp)");
 123 module_param(miimon, int, 0);
 124 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 125 module_param(updelay, int, 0);
 126 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 127 module_param(downdelay, int, 0);
 128 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 129                             "in milliseconds");
 130 module_param(use_carrier, int, 0);
 131 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 132                               "0 for off, 1 for on (default)");
 133 module_param(mode, charp, 0);
 134 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 135                        "1 for active-backup, 2 for balance-xor, "
 136                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 137                        "6 for balance-alb");
 138 module_param(primary, charp, 0);
 139 MODULE_PARM_DESC(primary, "Primary network device to use");
 140 module_param(primary_reselect, charp, 0);
 141 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 142                                    "once it comes up; "
 143                                    "0 for always (default), "
 144                                    "1 for only if speed of primary is "
 145                                    "better, "
 146                                    "2 for only on active slave "
 147                                    "failure");
 148 module_param(lacp_rate, charp, 0);
 149 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 150                             "0 for slow, 1 for fast");
 151 module_param(ad_select, charp, 0);
 152 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 153                             "0 for stable (default), 1 for bandwidth, "
 154                             "2 for count");
 155 module_param(min_links, int, 0);
 156 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 157
 158 module_param(xmit_hash_policy, charp, 0);
 159 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 160                                    "0 for layer 2 (default), 1 for layer 3+4, "
 161                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 162                                    "4 for encap layer 3+4");
 163 module_param(arp_interval, int, 0);
 164 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 165 module_param_array(arp_ip_target, charp, NULL, 0);
 166 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 167 module_param(arp_validate, charp, 0);
 168 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 169                                "0 for none (default), 1 for active, "
 170                                "2 for backup, 3 for all");
 171 module_param(arp_all_targets, charp, 0);
 172 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 173 module_param(fail_over_mac, charp, 0);
 174 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 175                                 "the same MAC; 0 for none (default), "
 176                                 "1 for active, 2 for follow");
 177 module_param(all_slaves_active, int, 0);
 178 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 179                                      "by setting active flag for all slaves; "
 180                                      "0 for never (default), 1 for always.");
 181 module_param(resend_igmp, int, 0);
 182 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 183                               "link failure");
 184 module_param(packets_per_slave, int, 0);
 185 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 186                                     "mode; 0 for a random slave, 1 packet per "
 187                                     "slave (default), >1 packets per slave.");
 188 module_param(lp_interval, uint, 0);
 189 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 190                               "the bonding driver sends learning packets to "
 191                               "each slaves peer switch. The default is 1.");
 192
 193 /*----------------------------- Global variables ----------------------------*/
 194
 195 #ifdef CONFIG_NET_POLL_CONTROLLER
 196 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 197 #endif
 198
 199 int bond_net_id __read_mostly;
 200
 201 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 202 static int arp_ip_count;
 203 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 204 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 205 static int lacp_fast;
 206
 207 /*-------------------------- Forward declarations ---------------------------*/
 208
 209 static int bond_init(struct net_device *bond_dev);
 210 static void bond_uninit(struct net_device *bond_dev);
 211 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
 212                                                 struct rtnl_link_stats64 *stats);
 213 static void bond_slave_arr_handler(struct work_struct *work);
 214
 215 /*---------------------------- General routines -----------------------------*/
 216
 217 const char *bond_mode_name(int mode)
 218 {
 219         static const char *names[] = {
 220                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 221                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 222                 [BOND_MODE_XOR] = "load balancing (xor)",
 223                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 224                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 225                 [BOND_MODE_TLB] = "transmit load balancing",
 226                 [BOND_MODE_ALB] = "adaptive load balancing",
 227         };
 228
 229         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 230                 return "unknown";
 231
 232         return names[mode];
 233 }
 234
 235 /*---------------------------------- VLAN -----------------------------------*/
 236
 237 /**
 238  * bond_dev_queue_xmit - Prepare skb for xmit.
 239  *
 240  * @bond: bond device that got this skb for tx.
 241  * @skb: hw accel VLAN tagged skb to transmit
 242  * @slave_dev: slave that is supposed to xmit this skbuff
 243  */
 244 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 245                         struct net_device *slave_dev)
 246 {
 247         skb->dev = slave_dev;
 248
 249         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 250                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 251         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 252
 253         if (unlikely(netpoll_tx_running(bond->dev)))
 254                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 255         else
 256                 dev_queue_xmit(skb);
 257 }
 258
 259 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 260  * We don't protect the slave list iteration with a lock because:
 261  * a. This operation is performed in IOCTL context,
 262  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 263  * c. Holding a lock with BH disabled while directly calling a base driver
 264  *    entry point is generally a BAD idea.
 265  *
 266  * The design of synchronization/protection for this operation in the 8021q
 267  * module is good for one or more VLAN devices over a single physical device
 268  * and cannot be extended for a teaming solution like bonding, so there is a
 269  * potential race condition here where a net device from the vlan group might
 270  * be referenced (either by a base driver or the 8021q code) while it is being
 271  * removed from the system. However, it turns out we're not making matters
 272  * worse, and if it works for regular VLAN usage it will work here too.
 273 */
 274
 275 /**
 276  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 277  * @bond_dev: bonding net device that got called
 278  * @vid: vlan id being added
 279  */
 280 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 281                                 __be16 proto, u16 vid)
 282 {
 283         struct bonding *bond = netdev_priv(bond_dev);
 284         struct slave *slave, *rollback_slave;
 285         struct list_head *iter;
 286         int res;
 287
 288         bond_for_each_slave(bond, slave, iter) {
 289                 res = vlan_vid_add(slave->dev, proto, vid);
 290                 if (res)
 291                         goto unwind;
 292         }
 293
 294         return 0;
 295
 296 unwind:
 297         /* unwind to the slave that failed */
 298         bond_for_each_slave(bond, rollback_slave, iter) {
 299                 if (rollback_slave == slave)
 300                         break;
 301
 302                 vlan_vid_del(rollback_slave->dev, proto, vid);
 303         }
 304
 305         return res;
 306 }
 307
 308 /**
 309  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 310  * @bond_dev: bonding net device that got called
 311  * @vid: vlan id being removed
 312  */
 313 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 314                                  __be16 proto, u16 vid)
 315 {
 316         struct bonding *bond = netdev_priv(bond_dev);
 317         struct list_head *iter;
 318         struct slave *slave;
 319
 320         bond_for_each_slave(bond, slave, iter)
 321                 vlan_vid_del(slave->dev, proto, vid);
 322
 323         if (bond_is_lb(bond))
 324                 bond_alb_clear_vlan(bond, vid);
 325
 326         return 0;
 327 }
 328
 329 /*------------------------------- Link status -------------------------------*/
 330
 331 /* Set the carrier state for the master according to the state of its
 332  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 333  * do special 802.3ad magic.
 334  *
 335  * Returns zero if carrier state does not change, nonzero if it does.
 336  */
 337 static 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.
 370  */
 371 static void bond_update_speed_duplex(struct slave *slave)
 372 {
 373         struct net_device *slave_dev = slave->dev;
 374         struct ethtool_cmd ecmd;
 375         u32 slave_speed;
 376         int res;
 377
 378         slave->speed = SPEED_UNKNOWN;
 379         slave->duplex = DUPLEX_UNKNOWN;
 380
 381         res = __ethtool_get_settings(slave_dev, &ecmd);
 382         if (res < 0)
 383                 return;
 384
 385         slave_speed = ethtool_cmd_speed(&ecmd);
 386         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 387                 return;
 388
 389         switch (ecmd.duplex) {
 390         case DUPLEX_FULL:
 391         case DUPLEX_HALF:
 392                 break;
 393         default:
 394                 return;
 395         }
 396
 397         slave->speed = slave_speed;
 398         slave->duplex = ecmd.duplex;
 399
 400         return;
 401 }
 402
 403 const char *bond_slave_link_status(s8 link)
 404 {
 405         switch (link) {
 406         case BOND_LINK_UP:
 407                 return "up";
 408         case BOND_LINK_FAIL:
 409                 return "going down";
 410         case BOND_LINK_DOWN:
 411                 return "down";
 412         case BOND_LINK_BACK:
 413                 return "going back";
 414         default:
 415                 return "unknown";
 416         }
 417 }
 418
 419 /* if <dev> supports MII link status reporting, check its link status.
 420  *
 421  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 422  * depending upon the setting of the use_carrier parameter.
 423  *
 424  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 425  * can't tell and just pretend it is), or 0, meaning that the link is
 426  * down.
 427  *
 428  * If reporting is non-zero, instead of faking link up, return -1 if
 429  * both ETHTOOL and MII ioctls fail (meaning the device does not
 430  * support them).  If use_carrier is set, return whatever it says.
 431  * It'd be nice if there was a good way to tell if a driver supports
 432  * netif_carrier, but there really isn't.
 433  */
 434 static int bond_check_dev_link(struct bonding *bond,
 435                                struct net_device *slave_dev, int reporting)
 436 {
 437         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 438         int (*ioctl)(struct net_device *, struct ifreq *, int);
 439         struct ifreq ifr;
 440         struct mii_ioctl_data *mii;
 441
 442         if (!reporting && !netif_running(slave_dev))
 443                 return 0;
 444
 445         if (bond->params.use_carrier)
 446                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 447
 448         /* Try to get link status using Ethtool first. */
 449         if (slave_dev->ethtool_ops->get_link)
 450                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 451                         BMSR_LSTATUS : 0;
 452
 453         /* Ethtool can't be used, fallback to MII ioctls. */
 454         ioctl = slave_ops->ndo_do_ioctl;
 455         if (ioctl) {
 456                 /* TODO: set pointer to correct ioctl on a per team member
 457                  *       bases to make this more efficient. that is, once
 458                  *       we determine the correct ioctl, we will always
 459                  *       call it and not the others for that team
 460                  *       member.
 461                  */
 462
 463                 /* We cannot assume that SIOCGMIIPHY will also read a
 464                  * register; not all network drivers (e.g., e100)
 465                  * support that.
 466                  */
 467
 468                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 469                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 470                 mii = if_mii(&ifr);
 471                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 472                         mii->reg_num = MII_BMSR;
 473                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 474                                 return mii->val_out & BMSR_LSTATUS;
 475                 }
 476         }
 477
 478         /* If reporting, report that either there's no dev->do_ioctl,
 479          * or both SIOCGMIIREG and get_link failed (meaning that we
 480          * cannot report link status).  If not reporting, pretend
 481          * we're ok.
 482          */
 483         return reporting ? -1 : BMSR_LSTATUS;
 484 }
 485
 486 /*----------------------------- Multicast list ------------------------------*/
 487
 488 /* Push the promiscuity flag down to appropriate slaves */
 489 static int bond_set_promiscuity(struct bonding *bond, int inc)
 490 {
 491         struct list_head *iter;
 492         int err = 0;
 493
 494         if (bond_uses_primary(bond)) {
 495                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 496
 497                 if (curr_active)
 498                         err = dev_set_promiscuity(curr_active->dev, inc);
 499         } else {
 500                 struct slave *slave;
 501
 502                 bond_for_each_slave(bond, slave, iter) {
 503                         err = dev_set_promiscuity(slave->dev, inc);
 504                         if (err)
 505                                 return err;
 506                 }
 507         }
 508         return err;
 509 }
 510
 511 /* Push the allmulti flag down to all slaves */
 512 static int bond_set_allmulti(struct bonding *bond, int inc)
 513 {
 514         struct list_head *iter;
 515         int err = 0;
 516
 517         if (bond_uses_primary(bond)) {
 518                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 519
 520                 if (curr_active)
 521                         err = dev_set_allmulti(curr_active->dev, inc);
 522         } else {
 523                 struct slave *slave;
 524
 525                 bond_for_each_slave(bond, slave, iter) {
 526                         err = dev_set_allmulti(slave->dev, inc);
 527                         if (err)
 528                                 return err;
 529                 }
 530         }
 531         return err;
 532 }
 533
 534 /* Retrieve the list of registered multicast addresses for the bonding
 535  * device and retransmit an IGMP JOIN request to the current active
 536  * slave.
 537  */
 538 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 539 {
 540         struct bonding *bond = container_of(work, struct bonding,
 541                                             mcast_work.work);
 542
 543         if (!rtnl_trylock()) {
 544                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 545                 return;
 546         }
 547         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 548
 549         if (bond->igmp_retrans > 1) {
 550                 bond->igmp_retrans--;
 551                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 552         }
 553         rtnl_unlock();
 554 }
 555
 556 /* Flush bond's hardware addresses from slave */
 557 static void bond_hw_addr_flush(struct net_device *bond_dev,
 558                                struct net_device *slave_dev)
 559 {
 560         struct bonding *bond = netdev_priv(bond_dev);
 561
 562         dev_uc_unsync(slave_dev, bond_dev);
 563         dev_mc_unsync(slave_dev, bond_dev);
 564
 565         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 566                 /* del lacpdu mc addr from mc list */
 567                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 568
 569                 dev_mc_del(slave_dev, lacpdu_multicast);
 570         }
 571 }
 572
 573 /*--------------------------- Active slave change ---------------------------*/
 574
 575 /* Update the hardware address list and promisc/allmulti for the new and
 576  * old active slaves (if any).  Modes that are not using primary keep all
 577  * slaves up date at all times; only the modes that use primary need to call
 578  * this function to swap these settings during a failover.
 579  */
 580 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 581                               struct slave *old_active)
 582 {
 583         if (old_active) {
 584                 if (bond->dev->flags & IFF_PROMISC)
 585                         dev_set_promiscuity(old_active->dev, -1);
 586
 587                 if (bond->dev->flags & IFF_ALLMULTI)
 588                         dev_set_allmulti(old_active->dev, -1);
 589
 590                 bond_hw_addr_flush(bond->dev, old_active->dev);
 591         }
 592
 593         if (new_active) {
 594                 /* FIXME: Signal errors upstream. */
 595                 if (bond->dev->flags & IFF_PROMISC)
 596                         dev_set_promiscuity(new_active->dev, 1);
 597
 598                 if (bond->dev->flags & IFF_ALLMULTI)
 599                         dev_set_allmulti(new_active->dev, 1);
 600
 601                 netif_addr_lock_bh(bond->dev);
 602                 dev_uc_sync(new_active->dev, bond->dev);
 603                 dev_mc_sync(new_active->dev, bond->dev);
 604                 netif_addr_unlock_bh(bond->dev);
 605         }
 606 }
 607
 608 /**
 609  * bond_set_dev_addr - clone slave's address to bond
 610  * @bond_dev: bond net device
 611  * @slave_dev: slave net device
 612  *
 613  * Should be called with RTNL held.
 614  */
 615 static void bond_set_dev_addr(struct net_device *bond_dev,
 616                               struct net_device *slave_dev)
 617 {
 618         netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 619                    bond_dev, slave_dev, slave_dev->addr_len);
 620         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 621         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 622         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 623 }
 624
 625 /* bond_do_fail_over_mac
 626  *
 627  * Perform special MAC address swapping for fail_over_mac settings
 628  *
 629  * Called with RTNL
 630  */
 631 static void bond_do_fail_over_mac(struct bonding *bond,
 632                                   struct slave *new_active,
 633                                   struct slave *old_active)
 634 {
 635         u8 tmp_mac[ETH_ALEN];
 636         struct sockaddr saddr;
 637         int rv;
 638
 639         switch (bond->params.fail_over_mac) {
 640         case BOND_FOM_ACTIVE:
 641                 if (new_active)
 642                         bond_set_dev_addr(bond->dev, new_active->dev);
 643                 break;
 644         case BOND_FOM_FOLLOW:
 645                 /* if new_active && old_active, swap them
 646                  * if just old_active, do nothing (going to no active slave)
 647                  * if just new_active, set new_active to bond's MAC
 648                  */
 649                 if (!new_active)
 650                         return;
 651
 652                 if (old_active) {
 653                         ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
 654                         ether_addr_copy(saddr.sa_data,
 655                                         old_active->dev->dev_addr);
 656                         saddr.sa_family = new_active->dev->type;
 657                 } else {
 658                         ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
 659                         saddr.sa_family = bond->dev->type;
 660                 }
 661
 662                 rv = dev_set_mac_address(new_active->dev, &saddr);
 663                 if (rv) {
 664                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 665                                    -rv, new_active->dev->name);
 666                         goto out;
 667                 }
 668
 669                 if (!old_active)
 670                         goto out;
 671
 672                 ether_addr_copy(saddr.sa_data, tmp_mac);
 673                 saddr.sa_family = old_active->dev->type;
 674
 675                 rv = dev_set_mac_address(old_active->dev, &saddr);
 676                 if (rv)
 677                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 678                                    -rv, new_active->dev->name);
 679 out:
 680                 break;
 681         default:
 682                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 683                            bond->params.fail_over_mac);
 684                 break;
 685         }
 686
 687 }
 688
 689 static bool bond_should_change_active(struct bonding *bond)
 690 {
 691         struct slave *prim = rtnl_dereference(bond->primary_slave);
 692         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 693
 694         if (!prim || !curr || curr->link != BOND_LINK_UP)
 695                 return true;
 696         if (bond->force_primary) {
 697                 bond->force_primary = false;
 698                 return true;
 699         }
 700         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 701             (prim->speed < curr->speed ||
 702              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 703                 return false;
 704         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 705                 return false;
 706         return true;
 707 }
 708
 709 /**
 710  * find_best_interface - select the best available slave to be the active one
 711  * @bond: our bonding struct
 712  */
 713 static struct slave *bond_find_best_slave(struct bonding *bond)
 714 {
 715         struct slave *slave, *bestslave = NULL, *primary;
 716         struct list_head *iter;
 717         int mintime = bond->params.updelay;
 718
 719         primary = rtnl_dereference(bond->primary_slave);
 720         if (primary && primary->link == BOND_LINK_UP &&
 721             bond_should_change_active(bond))
 722                 return primary;
 723
 724         bond_for_each_slave(bond, slave, iter) {
 725                 if (slave->link == BOND_LINK_UP)
 726                         return slave;
 727                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 728                     slave->delay < mintime) {
 729                         mintime = slave->delay;
 730                         bestslave = slave;
 731                 }
 732         }
 733
 734         return bestslave;
 735 }
 736
 737 static bool bond_should_notify_peers(struct bonding *bond)
 738 {
 739         struct slave *slave;
 740
 741         rcu_read_lock();
 742         slave = rcu_dereference(bond->curr_active_slave);
 743         rcu_read_unlock();
 744
 745         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 746                    slave ? slave->dev->name : "NULL");
 747
 748         if (!slave || !bond->send_peer_notif ||
 749             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 750                 return false;
 751
 752         return true;
 753 }
 754
 755 /**
 756  * change_active_interface - change the active slave into the specified one
 757  * @bond: our bonding struct
 758  * @new: the new slave to make the active one
 759  *
 760  * Set the new slave to the bond's settings and unset them on the old
 761  * curr_active_slave.
 762  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 763  *
 764  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 765  * because it is apparently the best available slave we have, even though its
 766  * updelay hasn't timed out yet.
 767  *
 768  * Caller must hold RTNL.
 769  */
 770 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 771 {
 772         struct slave *old_active;
 773
 774         ASSERT_RTNL();
 775
 776         old_active = rtnl_dereference(bond->curr_active_slave);
 777
 778         if (old_active == new_active)
 779                 return;
 780
 781         if (new_active) {
 782                 new_active->last_link_up = jiffies;
 783
 784                 if (new_active->link == BOND_LINK_BACK) {
 785                         if (bond_uses_primary(bond)) {
 786                                 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
 787                                             new_active->dev->name,
 788                                             (bond->params.updelay - new_active->delay) * bond->params.miimon);
 789                         }
 790
 791                         new_active->delay = 0;
 792                         new_active->link = BOND_LINK_UP;
 793
 794                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 795                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 796
 797                         if (bond_is_lb(bond))
 798                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 799                 } else {
 800                         if (bond_uses_primary(bond)) {
 801                                 netdev_info(bond->dev, "making interface %s the new active one\n",
 802                                             new_active->dev->name);
 803                         }
 804                 }
 805         }
 806
 807         if (bond_uses_primary(bond))
 808                 bond_hw_addr_swap(bond, new_active, old_active);
 809
 810         if (bond_is_lb(bond)) {
 811                 bond_alb_handle_active_change(bond, new_active);
 812                 if (old_active)
 813                         bond_set_slave_inactive_flags(old_active,
 814                                                       BOND_SLAVE_NOTIFY_NOW);
 815                 if (new_active)
 816                         bond_set_slave_active_flags(new_active,
 817                                                     BOND_SLAVE_NOTIFY_NOW);
 818         } else {
 819                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 820         }
 821
 822         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
 823                 if (old_active)
 824                         bond_set_slave_inactive_flags(old_active,
 825                                                       BOND_SLAVE_NOTIFY_NOW);
 826
 827                 if (new_active) {
 828                         bool should_notify_peers = false;
 829
 830                         bond_set_slave_active_flags(new_active,
 831                                                     BOND_SLAVE_NOTIFY_NOW);
 832
 833                         if (bond->params.fail_over_mac)
 834                                 bond_do_fail_over_mac(bond, new_active,
 835                                                       old_active);
 836
 837                         if (netif_running(bond->dev)) {
 838                                 bond->send_peer_notif =
 839                                         bond->params.num_peer_notif;
 840                                 should_notify_peers =
 841                                         bond_should_notify_peers(bond);
 842                         }
 843
 844                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 845                         if (should_notify_peers)
 846                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 847                                                          bond->dev);
 848                 }
 849         }
 850
 851         /* resend IGMP joins since active slave has changed or
 852          * all were sent on curr_active_slave.
 853          * resend only if bond is brought up with the affected
 854          * bonding modes and the retransmission is enabled
 855          */
 856         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 857             ((bond_uses_primary(bond) && new_active) ||
 858              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
 859                 bond->igmp_retrans = bond->params.resend_igmp;
 860                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 861         }
 862 }
 863
 864 /**
 865  * bond_select_active_slave - select a new active slave, if needed
 866  * @bond: our bonding struct
 867  *
 868  * This functions should be called when one of the following occurs:
 869  * - The old curr_active_slave has been released or lost its link.
 870  * - The primary_slave has got its link back.
 871  * - A slave has got its link back and there's no old curr_active_slave.
 872  *
 873  * Caller must hold RTNL.
 874  */
 875 void bond_select_active_slave(struct bonding *bond)
 876 {
 877         struct slave *best_slave;
 878         int rv;
 879
 880         ASSERT_RTNL();
 881
 882         best_slave = bond_find_best_slave(bond);
 883         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
 884                 bond_change_active_slave(bond, best_slave);
 885                 rv = bond_set_carrier(bond);
 886                 if (!rv)
 887                         return;
 888
 889                 if (netif_carrier_ok(bond->dev)) {
 890                         netdev_info(bond->dev, "first active interface up!\n");
 891                 } else {
 892                         netdev_info(bond->dev, "now running without any active interface!\n");
 893                 }
 894         }
 895 }
 896
 897 #ifdef CONFIG_NET_POLL_CONTROLLER
 898 static inline int slave_enable_netpoll(struct slave *slave)
 899 {
 900         struct netpoll *np;
 901         int err = 0;
 902
 903         np = kzalloc(sizeof(*np), GFP_KERNEL);
 904         err = -ENOMEM;
 905         if (!np)
 906                 goto out;
 907
 908         err = __netpoll_setup(np, slave->dev);
 909         if (err) {
 910                 kfree(np);
 911                 goto out;
 912         }
 913         slave->np = np;
 914 out:
 915         return err;
 916 }
 917 static inline void slave_disable_netpoll(struct slave *slave)
 918 {
 919         struct netpoll *np = slave->np;
 920
 921         if (!np)
 922                 return;
 923
 924         slave->np = NULL;
 925         __netpoll_free_async(np);
 926 }
 927
 928 static void bond_poll_controller(struct net_device *bond_dev)
 929 {
 930 }
 931
 932 static void bond_netpoll_cleanup(struct net_device *bond_dev)
 933 {
 934         struct bonding *bond = netdev_priv(bond_dev);
 935         struct list_head *iter;
 936         struct slave *slave;
 937
 938         bond_for_each_slave(bond, slave, iter)
 939                 if (bond_slave_is_up(slave))
 940                         slave_disable_netpoll(slave);
 941 }
 942
 943 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
 944 {
 945         struct bonding *bond = netdev_priv(dev);
 946         struct list_head *iter;
 947         struct slave *slave;
 948         int err = 0;
 949
 950         bond_for_each_slave(bond, slave, iter) {
 951                 err = slave_enable_netpoll(slave);
 952                 if (err) {
 953                         bond_netpoll_cleanup(dev);
 954                         break;
 955                 }
 956         }
 957         return err;
 958 }
 959 #else
 960 static inline int slave_enable_netpoll(struct slave *slave)
 961 {
 962         return 0;
 963 }
 964 static inline void slave_disable_netpoll(struct slave *slave)
 965 {
 966 }
 967 static void bond_netpoll_cleanup(struct net_device *bond_dev)
 968 {
 969 }
 970 #endif
 971
 972 /*---------------------------------- IOCTL ----------------------------------*/
 973
 974 static netdev_features_t bond_fix_features(struct net_device *dev,
 975                                            netdev_features_t features)
 976 {
 977         struct bonding *bond = netdev_priv(dev);
 978         struct list_head *iter;
 979         netdev_features_t mask;
 980         struct slave *slave;
 981
 982         mask = features;
 983         features &= ~NETIF_F_ONE_FOR_ALL;
 984         features |= NETIF_F_ALL_FOR_ALL;
 985
 986         bond_for_each_slave(bond, slave, iter) {
 987                 features = netdev_increment_features(features,
 988                                                      slave->dev->features,
 989                                                      mask);
 990         }
 991         features = netdev_add_tso_features(features, mask);
 992
 993         return features;
 994 }
 995
 996 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
 997                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
 998                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
 999
1000 #define BOND_ENC_FEATURES       (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1001                                  NETIF_F_TSO | NETIF_F_GSO_UDP_TUNNEL)
1002
1003 static void bond_compute_features(struct bonding *bond)
1004 {
1005         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1006                                         IFF_XMIT_DST_RELEASE_PERM;
1007         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1008         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1009         struct net_device *bond_dev = bond->dev;
1010         struct list_head *iter;
1011         struct slave *slave;
1012         unsigned short max_hard_header_len = ETH_HLEN;
1013         unsigned int gso_max_size = GSO_MAX_SIZE;
1014         u16 gso_max_segs = GSO_MAX_SEGS;
1015
1016         if (!bond_has_slaves(bond))
1017                 goto done;
1018         vlan_features &= NETIF_F_ALL_FOR_ALL;
1019
1020         bond_for_each_slave(bond, slave, iter) {
1021                 vlan_features = netdev_increment_features(vlan_features,
1022                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1023
1024                 enc_features = netdev_increment_features(enc_features,
1025                                                          slave->dev->hw_enc_features,
1026                                                          BOND_ENC_FEATURES);
1027                 dst_release_flag &= slave->dev->priv_flags;
1028                 if (slave->dev->hard_header_len > max_hard_header_len)
1029                         max_hard_header_len = slave->dev->hard_header_len;
1030
1031                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1032                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1033         }
1034
1035 done:
1036         bond_dev->vlan_features = vlan_features;
1037         bond_dev->hw_enc_features = enc_features;
1038         bond_dev->hard_header_len = max_hard_header_len;
1039         bond_dev->gso_max_segs = gso_max_segs;
1040         netif_set_gso_max_size(bond_dev, gso_max_size);
1041
1042         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1043         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1044             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1045                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1046
1047         netdev_change_features(bond_dev);
1048 }
1049
1050 static void bond_setup_by_slave(struct net_device *bond_dev,
1051                                 struct net_device *slave_dev)
1052 {
1053         bond_dev->header_ops        = slave_dev->header_ops;
1054
1055         bond_dev->type              = slave_dev->type;
1056         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1057         bond_dev->addr_len          = slave_dev->addr_len;
1058
1059         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1060                 slave_dev->addr_len);
1061 }
1062
1063 /* On bonding slaves other than the currently active slave, suppress
1064  * duplicates except for alb non-mcast/bcast.
1065  */
1066 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1067                                             struct slave *slave,
1068                                             struct bonding *bond)
1069 {
1070         if (bond_is_slave_inactive(slave)) {
1071                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1072                     skb->pkt_type != PACKET_BROADCAST &&
1073                     skb->pkt_type != PACKET_MULTICAST)
1074                         return false;
1075                 return true;
1076         }
1077         return false;
1078 }
1079
1080 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1081 {
1082         struct sk_buff *skb = *pskb;
1083         struct slave *slave;
1084         struct bonding *bond;
1085         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1086                           struct slave *);
1087         int ret = RX_HANDLER_ANOTHER;
1088
1089         skb = skb_share_check(skb, GFP_ATOMIC);
1090         if (unlikely(!skb))
1091                 return RX_HANDLER_CONSUMED;
1092
1093         *pskb = skb;
1094
1095         slave = bond_slave_get_rcu(skb->dev);
1096         bond = slave->bond;
1097
1098         recv_probe = ACCESS_ONCE(bond->recv_probe);
1099         if (recv_probe) {
1100                 ret = recv_probe(skb, bond, slave);
1101                 if (ret == RX_HANDLER_CONSUMED) {
1102                         consume_skb(skb);
1103                         return ret;
1104                 }
1105         }
1106
1107         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1108                 return RX_HANDLER_EXACT;
1109         }
1110
1111         skb->dev = bond->dev;
1112
1113         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1114             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1115             skb->pkt_type == PACKET_HOST) {
1116
1117                 if (unlikely(skb_cow_head(skb,
1118                                           skb->data - skb_mac_header(skb)))) {
1119                         kfree_skb(skb);
1120                         return RX_HANDLER_CONSUMED;
1121                 }
1122                 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1123         }
1124
1125         return ret;
1126 }
1127
1128 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1129                                       struct net_device *slave_dev,
1130                                       struct slave *slave)
1131 {
1132         int err;
1133
1134         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1135         if (err)
1136                 return err;
1137         slave_dev->flags |= IFF_SLAVE;
1138         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1139         return 0;
1140 }
1141
1142 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1143                                   struct net_device *slave_dev)
1144 {
1145         netdev_upper_dev_unlink(slave_dev, bond_dev);
1146         slave_dev->flags &= ~IFF_SLAVE;
1147         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1148 }
1149
1150 static struct slave *bond_alloc_slave(struct bonding *bond)
1151 {
1152         struct slave *slave = NULL;
1153
1154         slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1155         if (!slave)
1156                 return NULL;
1157
1158         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1159                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1160                                                GFP_KERNEL);
1161                 if (!SLAVE_AD_INFO(slave)) {
1162                         kfree(slave);
1163                         return NULL;
1164                 }
1165         }
1166         return slave;
1167 }
1168
1169 static void bond_free_slave(struct slave *slave)
1170 {
1171         struct bonding *bond = bond_get_bond_by_slave(slave);
1172
1173         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1174                 kfree(SLAVE_AD_INFO(slave));
1175
1176         kfree(slave);
1177 }
1178
1179 /* enslave device <slave> to bond device <master> */
1180 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1181 {
1182         struct bonding *bond = netdev_priv(bond_dev);
1183         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1184         struct slave *new_slave = NULL, *prev_slave;
1185         struct sockaddr addr;
1186         int link_reporting;
1187         int res = 0, i;
1188
1189         if (!bond->params.use_carrier &&
1190             slave_dev->ethtool_ops->get_link == NULL &&
1191             slave_ops->ndo_do_ioctl == NULL) {
1192                 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1193                             slave_dev->name);
1194         }
1195
1196         /* already enslaved */
1197         if (slave_dev->flags & IFF_SLAVE) {
1198                 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1199                 return -EBUSY;
1200         }
1201
1202         if (bond_dev == slave_dev) {
1203                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1204                 return -EPERM;
1205         }
1206
1207         /* vlan challenged mutual exclusion */
1208         /* no need to lock since we're protected by rtnl_lock */
1209         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1210                 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1211                            slave_dev->name);
1212                 if (vlan_uses_dev(bond_dev)) {
1213                         netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1214                                    slave_dev->name, bond_dev->name);
1215                         return -EPERM;
1216                 } else {
1217                         netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1218                                     slave_dev->name, slave_dev->name,
1219                                     bond_dev->name);
1220                 }
1221         } else {
1222                 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1223                            slave_dev->name);
1224         }
1225
1226         /* Old ifenslave binaries are no longer supported.  These can
1227          * be identified with moderate accuracy by the state of the slave:
1228          * the current ifenslave will set the interface down prior to
1229          * enslaving it; the old ifenslave will not.
1230          */
1231         if ((slave_dev->flags & IFF_UP)) {
1232                 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1233                            slave_dev->name);
1234                 res = -EPERM;
1235                 goto err_undo_flags;
1236         }
1237
1238         /* set bonding device ether type by slave - bonding netdevices are
1239          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1240          * there is a need to override some of the type dependent attribs/funcs.
1241          *
1242          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1243          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1244          */
1245         if (!bond_has_slaves(bond)) {
1246                 if (bond_dev->type != slave_dev->type) {
1247                         netdev_dbg(bond_dev, "change device type from %d to %d\n",
1248                                    bond_dev->type, slave_dev->type);
1249
1250                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1251                                                        bond_dev);
1252                         res = notifier_to_errno(res);
1253                         if (res) {
1254                                 netdev_err(bond_dev, "refused to change device type\n");
1255                                 res = -EBUSY;
1256                                 goto err_undo_flags;
1257                         }
1258
1259                         /* Flush unicast and multicast addresses */
1260                         dev_uc_flush(bond_dev);
1261                         dev_mc_flush(bond_dev);
1262
1263                         if (slave_dev->type != ARPHRD_ETHER)
1264                                 bond_setup_by_slave(bond_dev, slave_dev);
1265                         else {
1266                                 ether_setup(bond_dev);
1267                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1268                         }
1269
1270                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1271                                                  bond_dev);
1272                 }
1273         } else if (bond_dev->type != slave_dev->type) {
1274                 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1275                            slave_dev->name, slave_dev->type, bond_dev->type);
1276                 res = -EINVAL;
1277                 goto err_undo_flags;
1278         }
1279
1280         if (slave_ops->ndo_set_mac_address == NULL) {
1281                 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1282                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1283                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1284                         if (!bond_has_slaves(bond)) {
1285                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1286                                 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1287                         } else {
1288                                 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");
1289                                 res = -EOPNOTSUPP;
1290                                 goto err_undo_flags;
1291                         }
1292                 }
1293         }
1294
1295         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1296
1297         /* If this is the first slave, then we need to set the master's hardware
1298          * address to be the same as the slave's.
1299          */
1300         if (!bond_has_slaves(bond) &&
1301             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1302                 bond_set_dev_addr(bond->dev, slave_dev);
1303
1304         new_slave = bond_alloc_slave(bond);
1305         if (!new_slave) {
1306                 res = -ENOMEM;
1307                 goto err_undo_flags;
1308         }
1309
1310         new_slave->bond = bond;
1311         new_slave->dev = slave_dev;
1312         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1313          * is set via sysfs or module option if desired.
1314          */
1315         new_slave->queue_id = 0;
1316
1317         /* Save slave's original mtu and then set it to match the bond */
1318         new_slave->original_mtu = slave_dev->mtu;
1319         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1320         if (res) {
1321                 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1322                 goto err_free;
1323         }
1324
1325         /* Save slave's original ("permanent") mac address for modes
1326          * that need it, and for restoring it upon release, and then
1327          * set it to the master's address
1328          */
1329         ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1330
1331         if (!bond->params.fail_over_mac ||
1332             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1333                 /* Set slave to master's mac address.  The application already
1334                  * set the master's mac address to that of the first slave
1335                  */
1336                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1337                 addr.sa_family = slave_dev->type;
1338                 res = dev_set_mac_address(slave_dev, &addr);
1339                 if (res) {
1340                         netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1341                         goto err_restore_mtu;
1342                 }
1343         }
1344
1345         /* open the slave since the application closed it */
1346         res = dev_open(slave_dev);
1347         if (res) {
1348                 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1349                 goto err_restore_mac;
1350         }
1351
1352         slave_dev->priv_flags |= IFF_BONDING;
1353         /* initialize slave stats */
1354         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1355
1356         if (bond_is_lb(bond)) {
1357                 /* bond_alb_init_slave() must be called before all other stages since
1358                  * it might fail and we do not want to have to undo everything
1359                  */
1360                 res = bond_alb_init_slave(bond, new_slave);
1361                 if (res)
1362                         goto err_close;
1363         }
1364
1365         /* If the mode uses primary, then the following is handled by
1366          * bond_change_active_slave().
1367          */
1368         if (!bond_uses_primary(bond)) {
1369                 /* set promiscuity level to new slave */
1370                 if (bond_dev->flags & IFF_PROMISC) {
1371                         res = dev_set_promiscuity(slave_dev, 1);
1372                         if (res)
1373                                 goto err_close;
1374                 }
1375
1376                 /* set allmulti level to new slave */
1377                 if (bond_dev->flags & IFF_ALLMULTI) {
1378                         res = dev_set_allmulti(slave_dev, 1);
1379                         if (res)
1380                                 goto err_close;
1381                 }
1382
1383                 netif_addr_lock_bh(bond_dev);
1384
1385                 dev_mc_sync_multiple(slave_dev, bond_dev);
1386                 dev_uc_sync_multiple(slave_dev, bond_dev);
1387
1388                 netif_addr_unlock_bh(bond_dev);
1389         }
1390
1391         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1392                 /* add lacpdu mc addr to mc list */
1393                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1394
1395                 dev_mc_add(slave_dev, lacpdu_multicast);
1396         }
1397
1398         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1399         if (res) {
1400                 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1401                            slave_dev->name);
1402                 goto err_close;
1403         }
1404
1405         prev_slave = bond_last_slave(bond);
1406
1407         new_slave->delay = 0;
1408         new_slave->link_failure_count = 0;
1409
1410         bond_update_speed_duplex(new_slave);
1411
1412         new_slave->last_rx = jiffies -
1413                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1414         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1415                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1416
1417         if (bond->params.miimon && !bond->params.use_carrier) {
1418                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1419
1420                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1421                         /* miimon is set but a bonded network driver
1422                          * does not support ETHTOOL/MII and
1423                          * arp_interval is not set.  Note: if
1424                          * use_carrier is enabled, we will never go
1425                          * here (because netif_carrier is always
1426                          * supported); thus, we don't need to change
1427                          * the messages for netif_carrier.
1428                          */
1429                         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",
1430                                     slave_dev->name);
1431                 } else if (link_reporting == -1) {
1432                         /* unable get link status using mii/ethtool */
1433                         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",
1434                                     slave_dev->name);
1435                 }
1436         }
1437
1438         /* check for initial state */
1439         if (bond->params.miimon) {
1440                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1441                         if (bond->params.updelay) {
1442                                 new_slave->link = BOND_LINK_BACK;
1443                                 new_slave->delay = bond->params.updelay;
1444                         } else {
1445                                 new_slave->link = BOND_LINK_UP;
1446                         }
1447                 } else {
1448                         new_slave->link = BOND_LINK_DOWN;
1449                 }
1450         } else if (bond->params.arp_interval) {
1451                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1452                         BOND_LINK_UP : BOND_LINK_DOWN);
1453         } else {
1454                 new_slave->link = BOND_LINK_UP;
1455         }
1456
1457         if (new_slave->link != BOND_LINK_DOWN)
1458                 new_slave->last_link_up = jiffies;
1459         netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1460                    new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1461                    (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1462
1463         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1464                 /* if there is a primary slave, remember it */
1465                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1466                         rcu_assign_pointer(bond->primary_slave, new_slave);
1467                         bond->force_primary = true;
1468                 }
1469         }
1470
1471         switch (BOND_MODE(bond)) {
1472         case BOND_MODE_ACTIVEBACKUP:
1473                 bond_set_slave_inactive_flags(new_slave,
1474                                               BOND_SLAVE_NOTIFY_NOW);
1475                 break;
1476         case BOND_MODE_8023AD:
1477                 /* in 802.3ad mode, the internal mechanism
1478                  * will activate the slaves in the selected
1479                  * aggregator
1480                  */
1481                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1482                 /* if this is the first slave */
1483                 if (!prev_slave) {
1484                         SLAVE_AD_INFO(new_slave)->id = 1;
1485                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1486                          * can be called only after the mac address of the bond is set
1487                          */
1488                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1489                 } else {
1490                         SLAVE_AD_INFO(new_slave)->id =
1491                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1492                 }
1493
1494                 bond_3ad_bind_slave(new_slave);
1495                 break;
1496         case BOND_MODE_TLB:
1497         case BOND_MODE_ALB:
1498                 bond_set_active_slave(new_slave);
1499                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1500                 break;
1501         default:
1502                 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1503
1504                 /* always active in trunk mode */
1505                 bond_set_active_slave(new_slave);
1506
1507                 /* In trunking mode there is little meaning to curr_active_slave
1508                  * anyway (it holds no special properties of the bond device),
1509                  * so we can change it without calling change_active_interface()
1510                  */
1511                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1512                     new_slave->link == BOND_LINK_UP)
1513                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1514
1515                 break;
1516         } /* switch(bond_mode) */
1517
1518 #ifdef CONFIG_NET_POLL_CONTROLLER
1519         slave_dev->npinfo = bond->dev->npinfo;
1520         if (slave_dev->npinfo) {
1521                 if (slave_enable_netpoll(new_slave)) {
1522                         netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1523                         res = -EBUSY;
1524                         goto err_detach;
1525                 }
1526         }
1527 #endif
1528
1529         if (!(bond_dev->features & NETIF_F_LRO))
1530                 dev_disable_lro(slave_dev);
1531
1532         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1533                                          new_slave);
1534         if (res) {
1535                 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1536                 goto err_detach;
1537         }
1538
1539         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1540         if (res) {
1541                 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1542                 goto err_unregister;
1543         }
1544
1545         res = bond_sysfs_slave_add(new_slave);
1546         if (res) {
1547                 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1548                 goto err_upper_unlink;
1549         }
1550
1551         bond->slave_cnt++;
1552         bond_compute_features(bond);
1553         bond_set_carrier(bond);
1554
1555         if (bond_uses_primary(bond)) {
1556                 block_netpoll_tx();
1557                 bond_select_active_slave(bond);
1558                 unblock_netpoll_tx();
1559         }
1560
1561         if (bond_mode_uses_xmit_hash(bond))
1562                 bond_update_slave_arr(bond, NULL);
1563
1564         netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1565                     slave_dev->name,
1566                     bond_is_active_slave(new_slave) ? "an active" : "a backup",
1567                     new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1568
1569         /* enslave is successful */
1570         return 0;
1571
1572 /* Undo stages on error */
1573 err_upper_unlink:
1574         bond_upper_dev_unlink(bond_dev, slave_dev);
1575
1576 err_unregister:
1577         netdev_rx_handler_unregister(slave_dev);
1578
1579 err_detach:
1580         if (!bond_uses_primary(bond))
1581                 bond_hw_addr_flush(bond_dev, slave_dev);
1582
1583         vlan_vids_del_by_dev(slave_dev, bond_dev);
1584         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1585                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1586         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1587                 block_netpoll_tx();
1588                 bond_change_active_slave(bond, NULL);
1589                 bond_select_active_slave(bond);
1590                 unblock_netpoll_tx();
1591         }
1592         /* either primary_slave or curr_active_slave might've changed */
1593         synchronize_rcu();
1594         slave_disable_netpoll(new_slave);
1595
1596 err_close:
1597         slave_dev->priv_flags &= ~IFF_BONDING;
1598         dev_close(slave_dev);
1599
1600 err_restore_mac:
1601         if (!bond->params.fail_over_mac ||
1602             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1603                 /* XXX TODO - fom follow mode needs to change master's
1604                  * MAC if this slave's MAC is in use by the bond, or at
1605                  * least print a warning.
1606                  */
1607                 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1608                 addr.sa_family = slave_dev->type;
1609                 dev_set_mac_address(slave_dev, &addr);
1610         }
1611
1612 err_restore_mtu:
1613         dev_set_mtu(slave_dev, new_slave->original_mtu);
1614
1615 err_free:
1616         bond_free_slave(new_slave);
1617
1618 err_undo_flags:
1619         /* Enslave of first slave has failed and we need to fix master's mac */
1620         if (!bond_has_slaves(bond) &&
1621             ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1622                 eth_hw_addr_random(bond_dev);
1623
1624         return res;
1625 }
1626
1627 /* Try to release the slave device <slave> from the bond device <master>
1628  * It is legal to access curr_active_slave without a lock because all the function
1629  * is RTNL-locked. If "all" is true it means that the function is being called
1630  * while destroying a bond interface and all slaves are being released.
1631  *
1632  * The rules for slave state should be:
1633  *   for Active/Backup:
1634  *     Active stays on all backups go down
1635  *   for Bonded connections:
1636  *     The first up interface should be left on and all others downed.
1637  */
1638 static int __bond_release_one(struct net_device *bond_dev,
1639                               struct net_device *slave_dev,
1640                               bool all)
1641 {
1642         struct bonding *bond = netdev_priv(bond_dev);
1643         struct slave *slave, *oldcurrent;
1644         struct sockaddr addr;
1645         int old_flags = bond_dev->flags;
1646         netdev_features_t old_features = bond_dev->features;
1647
1648         /* slave is not a slave or master is not master of this slave */
1649         if (!(slave_dev->flags & IFF_SLAVE) ||
1650             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1651                 netdev_err(bond_dev, "cannot release %s\n",
1652                            slave_dev->name);
1653                 return -EINVAL;
1654         }
1655
1656         block_netpoll_tx();
1657
1658         slave = bond_get_slave_by_dev(bond, slave_dev);
1659         if (!slave) {
1660                 /* not a slave of this bond */
1661                 netdev_info(bond_dev, "%s not enslaved\n",
1662                             slave_dev->name);
1663                 unblock_netpoll_tx();
1664                 return -EINVAL;
1665         }
1666
1667         bond_sysfs_slave_del(slave);
1668
1669         /* recompute stats just before removing the slave */
1670         bond_get_stats(bond->dev, &bond->bond_stats);
1671
1672         bond_upper_dev_unlink(bond_dev, slave_dev);
1673         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1674          * for this slave anymore.
1675          */
1676         netdev_rx_handler_unregister(slave_dev);
1677
1678         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1679                 bond_3ad_unbind_slave(slave);
1680
1681         if (bond_mode_uses_xmit_hash(bond))
1682                 bond_update_slave_arr(bond, slave);
1683
1684         netdev_info(bond_dev, "Releasing %s interface %s\n",
1685                     bond_is_active_slave(slave) ? "active" : "backup",
1686                     slave_dev->name);
1687
1688         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1689
1690         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1691
1692         if (!all && (!bond->params.fail_over_mac ||
1693                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1694                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1695                     bond_has_slaves(bond))
1696                         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",
1697                                     slave_dev->name, slave->perm_hwaddr,
1698                                     bond_dev->name, slave_dev->name);
1699         }
1700
1701         if (rtnl_dereference(bond->primary_slave) == slave)
1702                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1703
1704         if (oldcurrent == slave)
1705                 bond_change_active_slave(bond, NULL);
1706
1707         if (bond_is_lb(bond)) {
1708                 /* Must be called only after the slave has been
1709                  * detached from the list and the curr_active_slave
1710                  * has been cleared (if our_slave == old_current),
1711                  * but before a new active slave is selected.
1712                  */
1713                 bond_alb_deinit_slave(bond, slave);
1714         }
1715
1716         if (all) {
1717                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1718         } else if (oldcurrent == slave) {
1719                 /* Note that we hold RTNL over this sequence, so there
1720                  * is no concern that another slave add/remove event
1721                  * will interfere.
1722                  */
1723                 bond_select_active_slave(bond);
1724         }
1725
1726         if (!bond_has_slaves(bond)) {
1727                 bond_set_carrier(bond);
1728                 eth_hw_addr_random(bond_dev);
1729         }
1730
1731         unblock_netpoll_tx();
1732         synchronize_rcu();
1733         bond->slave_cnt--;
1734
1735         if (!bond_has_slaves(bond)) {
1736                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1737                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1738         }
1739
1740         bond_compute_features(bond);
1741         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1742             (old_features & NETIF_F_VLAN_CHALLENGED))
1743                 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1744                             slave_dev->name, bond_dev->name);
1745
1746         vlan_vids_del_by_dev(slave_dev, bond_dev);
1747
1748         /* If the mode uses primary, then this case was handled above by
1749          * bond_change_active_slave(..., NULL)
1750          */
1751         if (!bond_uses_primary(bond)) {
1752                 /* unset promiscuity level from slave
1753                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1754                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1755                  * value of that flag before that change, as that was the value
1756                  * when this slave was attached, so we cache at the start of the
1757                  * function and use it here. Same goes for ALLMULTI below
1758                  */
1759                 if (old_flags & IFF_PROMISC)
1760                         dev_set_promiscuity(slave_dev, -1);
1761
1762                 /* unset allmulti level from slave */
1763                 if (old_flags & IFF_ALLMULTI)
1764                         dev_set_allmulti(slave_dev, -1);
1765
1766                 bond_hw_addr_flush(bond_dev, slave_dev);
1767         }
1768
1769         slave_disable_netpoll(slave);
1770
1771         /* close slave before restoring its mac address */
1772         dev_close(slave_dev);
1773
1774         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1775             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1776                 /* restore original ("permanent") mac address */
1777                 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1778                 addr.sa_family = slave_dev->type;
1779                 dev_set_mac_address(slave_dev, &addr);
1780         }
1781
1782         dev_set_mtu(slave_dev, slave->original_mtu);
1783
1784         slave_dev->priv_flags &= ~IFF_BONDING;
1785
1786         bond_free_slave(slave);
1787
1788         return 0;
1789 }
1790
1791 /* A wrapper used because of ndo_del_link */
1792 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1793 {
1794         return __bond_release_one(bond_dev, slave_dev, false);
1795 }
1796
1797 /* First release a slave and then destroy the bond if no more slaves are left.
1798  * Must be under rtnl_lock when this function is called.
1799  */
1800 static int  bond_release_and_destroy(struct net_device *bond_dev,
1801                                      struct net_device *slave_dev)
1802 {
1803         struct bonding *bond = netdev_priv(bond_dev);
1804         int ret;
1805
1806         ret = bond_release(bond_dev, slave_dev);
1807         if (ret == 0 && !bond_has_slaves(bond)) {
1808                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1809                 netdev_info(bond_dev, "Destroying bond %s\n",
1810                             bond_dev->name);
1811                 unregister_netdevice(bond_dev);
1812         }
1813         return ret;
1814 }
1815
1816 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1817 {
1818         struct bonding *bond = netdev_priv(bond_dev);
1819
1820         info->bond_mode = BOND_MODE(bond);
1821         info->miimon = bond->params.miimon;
1822         info->num_slaves = bond->slave_cnt;
1823
1824         return 0;
1825 }
1826
1827 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1828 {
1829         struct bonding *bond = netdev_priv(bond_dev);
1830         struct list_head *iter;
1831         int i = 0, res = -ENODEV;
1832         struct slave *slave;
1833
1834         bond_for_each_slave(bond, slave, iter) {
1835                 if (i++ == (int)info->slave_id) {
1836                         res = 0;
1837                         strcpy(info->slave_name, slave->dev->name);
1838                         info->link = slave->link;
1839                         info->state = bond_slave_state(slave);
1840                         info->link_failure_count = slave->link_failure_count;
1841                         break;
1842                 }
1843         }
1844
1845         return res;
1846 }
1847
1848 /*-------------------------------- Monitoring -------------------------------*/
1849
1850 /* called with rcu_read_lock() */
1851 static int bond_miimon_inspect(struct bonding *bond)
1852 {
1853         int link_state, commit = 0;
1854         struct list_head *iter;
1855         struct slave *slave;
1856         bool ignore_updelay;
1857
1858         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1859
1860         bond_for_each_slave_rcu(bond, slave, iter) {
1861                 slave->new_link = BOND_LINK_NOCHANGE;
1862
1863                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1864
1865                 switch (slave->link) {
1866                 case BOND_LINK_UP:
1867                         if (link_state)
1868                                 continue;
1869
1870                         slave->link = BOND_LINK_FAIL;
1871                         slave->delay = bond->params.downdelay;
1872                         if (slave->delay) {
1873                                 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
1874                                             (BOND_MODE(bond) ==
1875                                              BOND_MODE_ACTIVEBACKUP) ?
1876                                              (bond_is_active_slave(slave) ?
1877                                               "active " : "backup ") : "",
1878                                             slave->dev->name,
1879                                             bond->params.downdelay * bond->params.miimon);
1880                         }
1881                         /*FALLTHRU*/
1882                 case BOND_LINK_FAIL:
1883                         if (link_state) {
1884                                 /* recovered before downdelay expired */
1885                                 slave->link = BOND_LINK_UP;
1886                                 slave->last_link_up = jiffies;
1887                                 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
1888                                             (bond->params.downdelay - slave->delay) *
1889                                             bond->params.miimon,
1890                                             slave->dev->name);
1891                                 continue;
1892                         }
1893
1894                         if (slave->delay <= 0) {
1895                                 slave->new_link = BOND_LINK_DOWN;
1896                                 commit++;
1897                                 continue;
1898                         }
1899
1900                         slave->delay--;
1901                         break;
1902
1903                 case BOND_LINK_DOWN:
1904                         if (!link_state)
1905                                 continue;
1906
1907                         slave->link = BOND_LINK_BACK;
1908                         slave->delay = bond->params.updelay;
1909
1910                         if (slave->delay) {
1911                                 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
1912                                             slave->dev->name,
1913                                             ignore_updelay ? 0 :
1914                                             bond->params.updelay *
1915                                             bond->params.miimon);
1916                         }
1917                         /*FALLTHRU*/
1918                 case BOND_LINK_BACK:
1919                         if (!link_state) {
1920                                 slave->link = BOND_LINK_DOWN;
1921                                 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
1922                                             (bond->params.updelay - slave->delay) *
1923                                             bond->params.miimon,
1924                                             slave->dev->name);
1925
1926                                 continue;
1927                         }
1928
1929                         if (ignore_updelay)
1930                                 slave->delay = 0;
1931
1932                         if (slave->delay <= 0) {
1933                                 slave->new_link = BOND_LINK_UP;
1934                                 commit++;
1935                                 ignore_updelay = false;
1936                                 continue;
1937                         }
1938
1939                         slave->delay--;
1940                         break;
1941                 }
1942         }
1943
1944         return commit;
1945 }
1946
1947 static void bond_miimon_commit(struct bonding *bond)
1948 {
1949         struct list_head *iter;
1950         struct slave *slave, *primary;
1951
1952         bond_for_each_slave(bond, slave, iter) {
1953                 switch (slave->new_link) {
1954                 case BOND_LINK_NOCHANGE:
1955                         continue;
1956
1957                 case BOND_LINK_UP:
1958                         slave->link = BOND_LINK_UP;
1959                         slave->last_link_up = jiffies;
1960
1961                         primary = rtnl_dereference(bond->primary_slave);
1962                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1963                                 /* prevent it from being the active one */
1964                                 bond_set_backup_slave(slave);
1965                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1966                                 /* make it immediately active */
1967                                 bond_set_active_slave(slave);
1968                         } else if (slave != primary) {
1969                                 /* prevent it from being the active one */
1970                                 bond_set_backup_slave(slave);
1971                         }
1972
1973                         netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
1974                                     slave->dev->name,
1975                                     slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
1976                                     slave->duplex ? "full" : "half");
1977
1978                         /* notify ad that the link status has changed */
1979                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1980                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
1981
1982                         if (bond_is_lb(bond))
1983                                 bond_alb_handle_link_change(bond, slave,
1984                                                             BOND_LINK_UP);
1985
1986                         if (BOND_MODE(bond) == BOND_MODE_XOR)
1987                                 bond_update_slave_arr(bond, NULL);
1988
1989                         if (!bond->curr_active_slave || slave == primary)
1990                                 goto do_failover;
1991
1992                         continue;
1993
1994                 case BOND_LINK_DOWN:
1995                         if (slave->link_failure_count < UINT_MAX)
1996                                 slave->link_failure_count++;
1997
1998                         slave->link = BOND_LINK_DOWN;
1999
2000                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2001                             BOND_MODE(bond) == BOND_MODE_8023AD)
2002                                 bond_set_slave_inactive_flags(slave,
2003                                                               BOND_SLAVE_NOTIFY_NOW);
2004
2005                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2006                                     slave->dev->name);
2007
2008                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2009                                 bond_3ad_handle_link_change(slave,
2010                                                             BOND_LINK_DOWN);
2011
2012                         if (bond_is_lb(bond))
2013                                 bond_alb_handle_link_change(bond, slave,
2014                                                             BOND_LINK_DOWN);
2015
2016                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2017                                 bond_update_slave_arr(bond, NULL);
2018
2019                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2020                                 goto do_failover;
2021
2022                         continue;
2023
2024                 default:
2025                         netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2026                                    slave->new_link, slave->dev->name);
2027                         slave->new_link = BOND_LINK_NOCHANGE;
2028
2029                         continue;
2030                 }
2031
2032 do_failover:
2033                 block_netpoll_tx();
2034                 bond_select_active_slave(bond);
2035                 unblock_netpoll_tx();
2036         }
2037
2038         bond_set_carrier(bond);
2039 }
2040
2041 /* bond_mii_monitor
2042  *
2043  * Really a wrapper that splits the mii monitor into two phases: an
2044  * inspection, then (if inspection indicates something needs to be done)
2045  * an acquisition of appropriate locks followed by a commit phase to
2046  * implement whatever link state changes are indicated.
2047  */
2048 static void bond_mii_monitor(struct work_struct *work)
2049 {
2050         struct bonding *bond = container_of(work, struct bonding,
2051                                             mii_work.work);
2052         bool should_notify_peers = false;
2053         unsigned long delay;
2054
2055         delay = msecs_to_jiffies(bond->params.miimon);
2056
2057         if (!bond_has_slaves(bond))
2058                 goto re_arm;
2059
2060         rcu_read_lock();
2061
2062         should_notify_peers = bond_should_notify_peers(bond);
2063
2064         if (bond_miimon_inspect(bond)) {
2065                 rcu_read_unlock();
2066
2067                 /* Race avoidance with bond_close cancel of workqueue */
2068                 if (!rtnl_trylock()) {
2069                         delay = 1;
2070                         should_notify_peers = false;
2071                         goto re_arm;
2072                 }
2073
2074                 bond_miimon_commit(bond);
2075
2076                 rtnl_unlock();  /* might sleep, hold no other locks */
2077         } else
2078                 rcu_read_unlock();
2079
2080 re_arm:
2081         if (bond->params.miimon)
2082                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2083
2084         if (should_notify_peers) {
2085                 if (!rtnl_trylock())
2086                         return;
2087                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2088                 rtnl_unlock();
2089         }
2090 }
2091
2092 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2093 {
2094         struct net_device *upper;
2095         struct list_head *iter;
2096         bool ret = false;
2097
2098         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2099                 return true;
2100
2101         rcu_read_lock();
2102         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2103                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2104                         ret = true;
2105                         break;
2106                 }
2107         }
2108         rcu_read_unlock();
2109
2110         return ret;
2111 }
2112
2113 /* We go to the (large) trouble of VLAN tagging ARP frames because
2114  * switches in VLAN mode (especially if ports are configured as
2115  * "native" to a VLAN) might not pass non-tagged frames.
2116  */
2117 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2118                           __be32 dest_ip, __be32 src_ip,
2119                           struct bond_vlan_tag *tags)
2120 {
2121         struct sk_buff *skb;
2122         struct bond_vlan_tag *outer_tag = tags;
2123
2124         netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2125                    arp_op, slave_dev->name, &dest_ip, &src_ip);
2126
2127         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2128                          NULL, slave_dev->dev_addr, NULL);
2129
2130         if (!skb) {
2131                 net_err_ratelimited("ARP packet allocation failed\n");
2132                 return;
2133         }
2134
2135         if (!tags || tags->vlan_proto == VLAN_N_VID)
2136                 goto xmit;
2137
2138         tags++;
2139
2140         /* Go through all the tags backwards and add them to the packet */
2141         while (tags->vlan_proto != VLAN_N_VID) {
2142                 if (!tags->vlan_id) {
2143                         tags++;
2144                         continue;
2145                 }
2146
2147                 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2148                            ntohs(outer_tag->vlan_proto), tags->vlan_id);
2149                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2150                                                 tags->vlan_id);
2151                 if (!skb) {
2152                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2153                         return;
2154                 }
2155
2156                 tags++;
2157         }
2158         /* Set the outer tag */
2159         if (outer_tag->vlan_id) {
2160                 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2161                            ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2162                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2163                                        outer_tag->vlan_id);
2164         }
2165
2166 xmit:
2167         arp_xmit(skb);
2168 }
2169
2170 /* Validate the device path between the @start_dev and the @end_dev.
2171  * The path is valid if the @end_dev is reachable through device
2172  * stacking.
2173  * When the path is validated, collect any vlan information in the
2174  * path.
2175  */
2176 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2177                                               struct net_device *end_dev,
2178                                               int level)
2179 {
2180         struct bond_vlan_tag *tags;
2181         struct net_device *upper;
2182         struct list_head  *iter;
2183
2184         if (start_dev == end_dev) {
2185                 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2186                 if (!tags)
2187                         return ERR_PTR(-ENOMEM);
2188                 tags[level].vlan_proto = VLAN_N_VID;
2189                 return tags;
2190         }
2191
2192         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2193                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2194                 if (IS_ERR_OR_NULL(tags)) {
2195                         if (IS_ERR(tags))
2196                                 return tags;
2197                         continue;
2198                 }
2199                 if (is_vlan_dev(upper)) {
2200                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2201                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2202                 }
2203
2204                 return tags;
2205         }
2206
2207         return NULL;
2208 }
2209
2210 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2211 {
2212         struct rtable *rt;
2213         struct bond_vlan_tag *tags;
2214         __be32 *targets = bond->params.arp_targets, addr;
2215         int i;
2216
2217         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2218                 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2219                 tags = NULL;
2220
2221                 /* Find out through which dev should the packet go */
2222                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2223                                      RTO_ONLINK, 0);
2224                 if (IS_ERR(rt)) {
2225                         /* there's no route to target - try to send arp
2226                          * probe to generate any traffic (arp_validate=0)
2227                          */
2228                         if (bond->params.arp_validate)
2229                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2230                                                      bond->dev->name,
2231                                                      &targets[i]);
2232                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2233                                       0, tags);
2234                         continue;
2235                 }
2236
2237                 /* bond device itself */
2238                 if (rt->dst.dev == bond->dev)
2239                         goto found;
2240
2241                 rcu_read_lock();
2242                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2243                 rcu_read_unlock();
2244
2245                 if (!IS_ERR_OR_NULL(tags))
2246                         goto found;
2247
2248                 /* Not our device - skip */
2249                 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2250                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2251
2252                 ip_rt_put(rt);
2253                 continue;
2254
2255 found:
2256                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2257                 ip_rt_put(rt);
2258                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2259                               addr, tags);
2260                 kfree(tags);
2261         }
2262 }
2263
2264 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2265 {
2266         int i;
2267
2268         if (!sip || !bond_has_this_ip(bond, tip)) {
2269                 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2270                            &sip, &tip);
2271                 return;
2272         }
2273
2274         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2275         if (i == -1) {
2276                 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2277                            &sip);
2278                 return;
2279         }
2280         slave->last_rx = jiffies;
2281         slave->target_last_arp_rx[i] = jiffies;
2282 }
2283
2284 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2285                  struct slave *slave)
2286 {
2287         struct arphdr *arp = (struct arphdr *)skb->data;
2288         struct slave *curr_active_slave;
2289         unsigned char *arp_ptr;
2290         __be32 sip, tip;
2291         int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2292
2293         if (!slave_do_arp_validate(bond, slave)) {
2294                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2295                     !slave_do_arp_validate_only(bond))
2296                         slave->last_rx = jiffies;
2297                 return RX_HANDLER_ANOTHER;
2298         } else if (!is_arp) {
2299                 return RX_HANDLER_ANOTHER;
2300         }
2301
2302         alen = arp_hdr_len(bond->dev);
2303
2304         netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2305                    skb->dev->name);
2306
2307         if (alen > skb_headlen(skb)) {
2308                 arp = kmalloc(alen, GFP_ATOMIC);
2309                 if (!arp)
2310                         goto out_unlock;
2311                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2312                         goto out_unlock;
2313         }
2314
2315         if (arp->ar_hln != bond->dev->addr_len ||
2316             skb->pkt_type == PACKET_OTHERHOST ||
2317             skb->pkt_type == PACKET_LOOPBACK ||
2318             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2319             arp->ar_pro != htons(ETH_P_IP) ||
2320             arp->ar_pln != 4)
2321                 goto out_unlock;
2322
2323         arp_ptr = (unsigned char *)(arp + 1);
2324         arp_ptr += bond->dev->addr_len;
2325         memcpy(&sip, arp_ptr, 4);
2326         arp_ptr += 4 + bond->dev->addr_len;
2327         memcpy(&tip, arp_ptr, 4);
2328
2329         netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2330                    slave->dev->name, bond_slave_state(slave),
2331                      bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2332                      &sip, &tip);
2333
2334         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2335
2336         /* Backup slaves won't see the ARP reply, but do come through
2337          * here for each ARP probe (so we swap the sip/tip to validate
2338          * the probe).  In a "redundant switch, common router" type of
2339          * configuration, the ARP probe will (hopefully) travel from
2340          * the active, through one switch, the router, then the other
2341          * switch before reaching the backup.
2342          *
2343          * We 'trust' the arp requests if there is an active slave and
2344          * it received valid arp reply(s) after it became active. This
2345          * is done to avoid endless looping when we can't reach the
2346          * arp_ip_target and fool ourselves with our own arp requests.
2347          */
2348
2349         if (bond_is_active_slave(slave))
2350                 bond_validate_arp(bond, slave, sip, tip);
2351         else if (curr_active_slave &&
2352                  time_after(slave_last_rx(bond, curr_active_slave),
2353                             curr_active_slave->last_link_up))
2354                 bond_validate_arp(bond, slave, tip, sip);
2355
2356 out_unlock:
2357         if (arp != (struct arphdr *)skb->data)
2358                 kfree(arp);
2359         return RX_HANDLER_ANOTHER;
2360 }
2361
2362 /* function to verify if we're in the arp_interval timeslice, returns true if
2363  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2364  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2365  */
2366 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2367                                   int mod)
2368 {
2369         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2370
2371         return time_in_range(jiffies,
2372                              last_act - delta_in_ticks,
2373                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2374 }
2375
2376 /* This function is called regularly to monitor each slave's link
2377  * ensuring that traffic is being sent and received when arp monitoring
2378  * is used in load-balancing mode. if the adapter has been dormant, then an
2379  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2380  * arp monitoring in active backup mode.
2381  */
2382 static void bond_loadbalance_arp_mon(struct work_struct *work)
2383 {
2384         struct bonding *bond = container_of(work, struct bonding,
2385                                             arp_work.work);
2386         struct slave *slave, *oldcurrent;
2387         struct list_head *iter;
2388         int do_failover = 0, slave_state_changed = 0;
2389
2390         if (!bond_has_slaves(bond))
2391                 goto re_arm;
2392
2393         rcu_read_lock();
2394
2395         oldcurrent = rcu_dereference(bond->curr_active_slave);
2396         /* see if any of the previous devices are up now (i.e. they have
2397          * xmt and rcv traffic). the curr_active_slave does not come into
2398          * the picture unless it is null. also, slave->last_link_up is not
2399          * needed here because we send an arp on each slave and give a slave
2400          * as long as it needs to get the tx/rx within the delta.
2401          * TODO: what about up/down delay in arp mode? it wasn't here before
2402          *       so it can wait
2403          */
2404         bond_for_each_slave_rcu(bond, slave, iter) {
2405                 unsigned long trans_start = dev_trans_start(slave->dev);
2406
2407                 if (slave->link != BOND_LINK_UP) {
2408                         if (bond_time_in_interval(bond, trans_start, 1) &&
2409                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2410
2411                                 slave->link  = BOND_LINK_UP;
2412                                 slave_state_changed = 1;
2413
2414                                 /* primary_slave has no meaning in round-robin
2415                                  * mode. the window of a slave being up and
2416                                  * curr_active_slave being null after enslaving
2417                                  * is closed.
2418                                  */
2419                                 if (!oldcurrent) {
2420                                         netdev_info(bond->dev, "link status definitely up for interface %s\n",
2421                                                     slave->dev->name);
2422                                         do_failover = 1;
2423                                 } else {
2424                                         netdev_info(bond->dev, "interface %s is now up\n",
2425                                                     slave->dev->name);
2426                                 }
2427                         }
2428                 } else {
2429                         /* slave->link == BOND_LINK_UP */
2430
2431                         /* not all switches will respond to an arp request
2432                          * when the source ip is 0, so don't take the link down
2433                          * if we don't know our ip yet
2434                          */
2435                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2436                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2437
2438                                 slave->link  = BOND_LINK_DOWN;
2439                                 slave_state_changed = 1;
2440
2441                                 if (slave->link_failure_count < UINT_MAX)
2442                                         slave->link_failure_count++;
2443
2444                                 netdev_info(bond->dev, "interface %s is now down\n",
2445                                             slave->dev->name);
2446
2447                                 if (slave == oldcurrent)
2448                                         do_failover = 1;
2449                         }
2450                 }
2451
2452                 /* note: if switch is in round-robin mode, all links
2453                  * must tx arp to ensure all links rx an arp - otherwise
2454                  * links may oscillate or not come up at all; if switch is
2455                  * in something like xor mode, there is nothing we can
2456                  * do - all replies will be rx'ed on same link causing slaves
2457                  * to be unstable during low/no traffic periods
2458                  */
2459                 if (bond_slave_is_up(slave))
2460                         bond_arp_send_all(bond, slave);
2461         }
2462
2463         rcu_read_unlock();
2464
2465         if (do_failover || slave_state_changed) {
2466                 if (!rtnl_trylock())
2467                         goto re_arm;
2468
2469                 if (slave_state_changed) {
2470                         bond_slave_state_change(bond);
2471                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2472                                 bond_update_slave_arr(bond, NULL);
2473                 } else if (do_failover) {
2474                         block_netpoll_tx();
2475                         bond_select_active_slave(bond);
2476                         unblock_netpoll_tx();
2477                 }
2478                 rtnl_unlock();
2479         }
2480
2481 re_arm:
2482         if (bond->params.arp_interval)
2483                 queue_delayed_work(bond->wq, &bond->arp_work,
2484                                    msecs_to_jiffies(bond->params.arp_interval));
2485 }
2486
2487 /* Called to inspect slaves for active-backup mode ARP monitor link state
2488  * changes.  Sets new_link in slaves to specify what action should take
2489  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2490  * to link states must be committed.
2491  *
2492  * Called with rcu_read_lock held.
2493  */
2494 static int bond_ab_arp_inspect(struct bonding *bond)
2495 {
2496         unsigned long trans_start, last_rx;
2497         struct list_head *iter;
2498         struct slave *slave;
2499         int commit = 0;
2500
2501         bond_for_each_slave_rcu(bond, slave, iter) {
2502                 slave->new_link = BOND_LINK_NOCHANGE;
2503                 last_rx = slave_last_rx(bond, slave);
2504
2505                 if (slave->link != BOND_LINK_UP) {
2506                         if (bond_time_in_interval(bond, last_rx, 1)) {
2507                                 slave->new_link = BOND_LINK_UP;
2508                                 commit++;
2509                         }
2510                         continue;
2511                 }
2512
2513                 /* Give slaves 2*delta after being enslaved or made
2514                  * active.  This avoids bouncing, as the last receive
2515                  * times need a full ARP monitor cycle to be updated.
2516                  */
2517                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2518                         continue;
2519
2520                 /* Backup slave is down if:
2521                  * - No current_arp_slave AND
2522                  * - more than 3*delta since last receive AND
2523                  * - the bond has an IP address
2524                  *
2525                  * Note: a non-null current_arp_slave indicates
2526                  * the curr_active_slave went down and we are
2527                  * searching for a new one; under this condition
2528                  * we only take the curr_active_slave down - this
2529                  * gives each slave a chance to tx/rx traffic
2530                  * before being taken out
2531                  */
2532                 if (!bond_is_active_slave(slave) &&
2533                     !rcu_access_pointer(bond->current_arp_slave) &&
2534                     !bond_time_in_interval(bond, last_rx, 3)) {
2535                         slave->new_link = BOND_LINK_DOWN;
2536                         commit++;
2537                 }
2538
2539                 /* Active slave is down if:
2540                  * - more than 2*delta since transmitting OR
2541                  * - (more than 2*delta since receive AND
2542                  *    the bond has an IP address)
2543                  */
2544                 trans_start = dev_trans_start(slave->dev);
2545                 if (bond_is_active_slave(slave) &&
2546                     (!bond_time_in_interval(bond, trans_start, 2) ||
2547                      !bond_time_in_interval(bond, last_rx, 2))) {
2548                         slave->new_link = BOND_LINK_DOWN;
2549                         commit++;
2550                 }
2551         }
2552
2553         return commit;
2554 }
2555
2556 /* Called to commit link state changes noted by inspection step of
2557  * active-backup mode ARP monitor.
2558  *
2559  * Called with RTNL hold.
2560  */
2561 static void bond_ab_arp_commit(struct bonding *bond)
2562 {
2563         unsigned long trans_start;
2564         struct list_head *iter;
2565         struct slave *slave;
2566
2567         bond_for_each_slave(bond, slave, iter) {
2568                 switch (slave->new_link) {
2569                 case BOND_LINK_NOCHANGE:
2570                         continue;
2571
2572                 case BOND_LINK_UP:
2573                         trans_start = dev_trans_start(slave->dev);
2574                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2575                             (!rtnl_dereference(bond->curr_active_slave) &&
2576                              bond_time_in_interval(bond, trans_start, 1))) {
2577                                 struct slave *current_arp_slave;
2578
2579                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2580                                 slave->link = BOND_LINK_UP;
2581                                 if (current_arp_slave) {
2582                                         bond_set_slave_inactive_flags(
2583                                                 current_arp_slave,
2584                                                 BOND_SLAVE_NOTIFY_NOW);
2585                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2586                                 }
2587
2588                                 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2589                                             slave->dev->name);
2590
2591                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2592                                     slave == rtnl_dereference(bond->primary_slave))
2593                                         goto do_failover;
2594
2595                         }
2596
2597                         continue;
2598
2599                 case BOND_LINK_DOWN:
2600                         if (slave->link_failure_count < UINT_MAX)
2601                                 slave->link_failure_count++;
2602
2603                         slave->link = BOND_LINK_DOWN;
2604                         bond_set_slave_inactive_flags(slave,
2605                                                       BOND_SLAVE_NOTIFY_NOW);
2606
2607                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2608                                     slave->dev->name);
2609
2610                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2611                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2612                                 goto do_failover;
2613                         }
2614
2615                         continue;
2616
2617                 default:
2618                         netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2619                                    slave->new_link, slave->dev->name);
2620                         continue;
2621                 }
2622
2623 do_failover:
2624                 block_netpoll_tx();
2625                 bond_select_active_slave(bond);
2626                 unblock_netpoll_tx();
2627         }
2628
2629         bond_set_carrier(bond);
2630 }
2631
2632 /* Send ARP probes for active-backup mode ARP monitor.
2633  *
2634  * Called with rcu_read_lock held.
2635  */
2636 static bool bond_ab_arp_probe(struct bonding *bond)
2637 {
2638         struct slave *slave, *before = NULL, *new_slave = NULL,
2639                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2640                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2641         struct list_head *iter;
2642         bool found = false;
2643         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2644
2645         if (curr_arp_slave && curr_active_slave)
2646                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2647                             curr_arp_slave->dev->name,
2648                             curr_active_slave->dev->name);
2649
2650         if (curr_active_slave) {
2651                 bond_arp_send_all(bond, curr_active_slave);
2652                 return should_notify_rtnl;
2653         }
2654
2655         /* if we don't have a curr_active_slave, search for the next available
2656          * backup slave from the current_arp_slave and make it the candidate
2657          * for becoming the curr_active_slave
2658          */
2659
2660         if (!curr_arp_slave) {
2661                 curr_arp_slave = bond_first_slave_rcu(bond);
2662                 if (!curr_arp_slave)
2663                         return should_notify_rtnl;
2664         }
2665
2666         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2667
2668         bond_for_each_slave_rcu(bond, slave, iter) {
2669                 if (!found && !before && bond_slave_is_up(slave))
2670                         before = slave;
2671
2672                 if (found && !new_slave && bond_slave_is_up(slave))
2673                         new_slave = slave;
2674                 /* if the link state is up at this point, we
2675                  * mark it down - this can happen if we have
2676                  * simultaneous link failures and
2677                  * reselect_active_interface doesn't make this
2678                  * one the current slave so it is still marked
2679                  * up when it is actually down
2680                  */
2681                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2682                         slave->link = BOND_LINK_DOWN;
2683                         if (slave->link_failure_count < UINT_MAX)
2684                                 slave->link_failure_count++;
2685
2686                         bond_set_slave_inactive_flags(slave,
2687                                                       BOND_SLAVE_NOTIFY_LATER);
2688
2689                         netdev_info(bond->dev, "backup interface %s is now down\n",
2690                                     slave->dev->name);
2691                 }
2692                 if (slave == curr_arp_slave)
2693                         found = true;
2694         }
2695
2696         if (!new_slave && before)
2697                 new_slave = before;
2698
2699         if (!new_slave)
2700                 goto check_state;
2701
2702         new_slave->link = BOND_LINK_BACK;
2703         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2704         bond_arp_send_all(bond, new_slave);
2705         new_slave->last_link_up = jiffies;
2706         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2707
2708 check_state:
2709         bond_for_each_slave_rcu(bond, slave, iter) {
2710                 if (slave->should_notify) {
2711                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2712                         break;
2713                 }
2714         }
2715         return should_notify_rtnl;
2716 }
2717
2718 static void bond_activebackup_arp_mon(struct work_struct *work)
2719 {
2720         struct bonding *bond = container_of(work, struct bonding,
2721                                             arp_work.work);
2722         bool should_notify_peers = false;
2723         bool should_notify_rtnl = false;
2724         int delta_in_ticks;
2725
2726         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2727
2728         if (!bond_has_slaves(bond))
2729                 goto re_arm;
2730
2731         rcu_read_lock();
2732
2733         should_notify_peers = bond_should_notify_peers(bond);
2734
2735         if (bond_ab_arp_inspect(bond)) {
2736                 rcu_read_unlock();
2737
2738                 /* Race avoidance with bond_close flush of workqueue */
2739                 if (!rtnl_trylock()) {
2740                         delta_in_ticks = 1;
2741                         should_notify_peers = false;
2742                         goto re_arm;
2743                 }
2744
2745                 bond_ab_arp_commit(bond);
2746
2747                 rtnl_unlock();
2748                 rcu_read_lock();
2749         }
2750
2751         should_notify_rtnl = bond_ab_arp_probe(bond);
2752         rcu_read_unlock();
2753
2754 re_arm:
2755         if (bond->params.arp_interval)
2756                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2757
2758         if (should_notify_peers || should_notify_rtnl) {
2759                 if (!rtnl_trylock())
2760                         return;
2761
2762                 if (should_notify_peers)
2763                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2764                                                  bond->dev);
2765                 if (should_notify_rtnl)
2766                         bond_slave_state_notify(bond);
2767
2768                 rtnl_unlock();
2769         }
2770 }
2771
2772 /*-------------------------- netdev event handling --------------------------*/
2773
2774 /* Change device name */
2775 static int bond_event_changename(struct bonding *bond)
2776 {
2777         bond_remove_proc_entry(bond);
2778         bond_create_proc_entry(bond);
2779
2780         bond_debug_reregister(bond);
2781
2782         return NOTIFY_DONE;
2783 }
2784
2785 static int bond_master_netdev_event(unsigned long event,
2786                                     struct net_device *bond_dev)
2787 {
2788         struct bonding *event_bond = netdev_priv(bond_dev);
2789
2790         switch (event) {
2791         case NETDEV_CHANGENAME:
2792                 return bond_event_changename(event_bond);
2793         case NETDEV_UNREGISTER:
2794                 bond_remove_proc_entry(event_bond);
2795                 break;
2796         case NETDEV_REGISTER:
2797                 bond_create_proc_entry(event_bond);
2798                 break;
2799         case NETDEV_NOTIFY_PEERS:
2800                 if (event_bond->send_peer_notif)
2801                         event_bond->send_peer_notif--;
2802                 break;
2803         default:
2804                 break;
2805         }
2806
2807         return NOTIFY_DONE;
2808 }
2809
2810 static int bond_slave_netdev_event(unsigned long event,
2811                                    struct net_device *slave_dev)
2812 {
2813         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2814         struct bonding *bond;
2815         struct net_device *bond_dev;
2816         u32 old_speed;
2817         u8 old_duplex;
2818
2819         /* A netdev event can be generated while enslaving a device
2820          * before netdev_rx_handler_register is called in which case
2821          * slave will be NULL
2822          */
2823         if (!slave)
2824                 return NOTIFY_DONE;
2825         bond_dev = slave->bond->dev;
2826         bond = slave->bond;
2827         primary = rtnl_dereference(bond->primary_slave);
2828
2829         switch (event) {
2830         case NETDEV_UNREGISTER:
2831                 if (bond_dev->type != ARPHRD_ETHER)
2832                         bond_release_and_destroy(bond_dev, slave_dev);
2833                 else
2834                         bond_release(bond_dev, slave_dev);
2835                 break;
2836         case NETDEV_UP:
2837         case NETDEV_CHANGE:
2838                 old_speed = slave->speed;
2839                 old_duplex = slave->duplex;
2840
2841                 bond_update_speed_duplex(slave);
2842
2843                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2844                         if (old_speed != slave->speed)
2845                                 bond_3ad_adapter_speed_changed(slave);
2846                         if (old_duplex != slave->duplex)
2847                                 bond_3ad_adapter_duplex_changed(slave);
2848                 }
2849                 /* Refresh slave-array if applicable!
2850                  * If the setup does not use miimon or arpmon (mode-specific!),
2851                  * then these events will not cause the slave-array to be
2852                  * refreshed. This will cause xmit to use a slave that is not
2853                  * usable. Avoid such situation by refeshing the array at these
2854                  * events. If these (miimon/arpmon) parameters are configured
2855                  * then array gets refreshed twice and that should be fine!
2856                  */
2857                 if (bond_mode_uses_xmit_hash(bond))
2858                         bond_update_slave_arr(bond, NULL);
2859                 break;
2860         case NETDEV_DOWN:
2861                 if (bond_mode_uses_xmit_hash(bond))
2862                         bond_update_slave_arr(bond, NULL);
2863                 break;
2864         case NETDEV_CHANGEMTU:
2865                 /* TODO: Should slaves be allowed to
2866                  * independently alter their MTU?  For
2867                  * an active-backup bond, slaves need
2868                  * not be the same type of device, so
2869                  * MTUs may vary.  For other modes,
2870                  * slaves arguably should have the
2871                  * same MTUs. To do this, we'd need to
2872                  * take over the slave's change_mtu
2873                  * function for the duration of their
2874                  * servitude.
2875                  */
2876                 break;
2877         case NETDEV_CHANGENAME:
2878                 /* we don't care if we don't have primary set */
2879                 if (!bond_uses_primary(bond) ||
2880                     !bond->params.primary[0])
2881                         break;
2882
2883                 if (slave == primary) {
2884                         /* slave's name changed - he's no longer primary */
2885                         RCU_INIT_POINTER(bond->primary_slave, NULL);
2886                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2887                         /* we have a new primary slave */
2888                         rcu_assign_pointer(bond->primary_slave, slave);
2889                 } else { /* we didn't change primary - exit */
2890                         break;
2891                 }
2892
2893                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
2894                             primary ? slave_dev->name : "none");
2895
2896                 block_netpoll_tx();
2897                 bond_select_active_slave(bond);
2898                 unblock_netpoll_tx();
2899                 break;
2900         case NETDEV_FEAT_CHANGE:
2901                 bond_compute_features(bond);
2902                 break;
2903         case NETDEV_RESEND_IGMP:
2904                 /* Propagate to master device */
2905                 call_netdevice_notifiers(event, slave->bond->dev);
2906                 break;
2907         default:
2908                 break;
2909         }
2910
2911         return NOTIFY_DONE;
2912 }
2913
2914 /* bond_netdev_event: handle netdev notifier chain events.
2915  *
2916  * This function receives events for the netdev chain.  The caller (an
2917  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2918  * locks for us to safely manipulate the slave devices (RTNL lock,
2919  * dev_probe_lock).
2920  */
2921 static int bond_netdev_event(struct notifier_block *this,
2922                              unsigned long event, void *ptr)
2923 {
2924         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2925
2926         netdev_dbg(event_dev, "event: %lx\n", event);
2927
2928         if (!(event_dev->priv_flags & IFF_BONDING))
2929                 return NOTIFY_DONE;
2930
2931         if (event_dev->flags & IFF_MASTER) {
2932                 netdev_dbg(event_dev, "IFF_MASTER\n");
2933                 return bond_master_netdev_event(event, event_dev);
2934         }
2935
2936         if (event_dev->flags & IFF_SLAVE) {
2937                 netdev_dbg(event_dev, "IFF_SLAVE\n");
2938                 return bond_slave_netdev_event(event, event_dev);
2939         }
2940
2941         return NOTIFY_DONE;
2942 }
2943
2944 static struct notifier_block bond_netdev_notifier = {
2945         .notifier_call = bond_netdev_event,
2946 };
2947
2948 /*---------------------------- Hashing Policies -----------------------------*/
2949
2950 /* L2 hash helper */
2951 static inline u32 bond_eth_hash(struct sk_buff *skb)
2952 {
2953         struct ethhdr *ep, hdr_tmp;
2954
2955         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
2956         if (ep)
2957                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
2958         return 0;
2959 }
2960
2961 /* Extract the appropriate headers based on bond's xmit policy */
2962 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
2963                               struct flow_keys *fk)
2964 {
2965         const struct ipv6hdr *iph6;
2966         const struct iphdr *iph;
2967         int noff, proto = -1;
2968
2969         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
2970                 return skb_flow_dissect(skb, fk);
2971
2972         fk->ports = 0;
2973         noff = skb_network_offset(skb);
2974         if (skb->protocol == htons(ETH_P_IP)) {
2975                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
2976                         return false;
2977                 iph = ip_hdr(skb);
2978                 fk->src = iph->saddr;
2979                 fk->dst = iph->daddr;
2980                 noff += iph->ihl << 2;
2981                 if (!ip_is_fragment(iph))
2982                         proto = iph->protocol;
2983         } else if (skb->protocol == htons(ETH_P_IPV6)) {
2984                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
2985                         return false;
2986                 iph6 = ipv6_hdr(skb);
2987                 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
2988                 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
2989                 noff += sizeof(*iph6);
2990                 proto = iph6->nexthdr;
2991         } else {
2992                 return false;
2993         }
2994         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
2995                 fk->ports = skb_flow_get_ports(skb, noff, proto);
2996
2997         return true;
2998 }
2999
3000 /**
3001  * bond_xmit_hash - generate a hash value based on the xmit policy
3002  * @bond: bonding device
3003  * @skb: buffer to use for headers
3004  *
3005  * This function will extract the necessary headers from the skb buffer and use
3006  * them to generate a hash based on the xmit_policy set in the bonding device
3007  */
3008 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3009 {
3010         struct flow_keys flow;
3011         u32 hash;
3012
3013         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3014             !bond_flow_dissect(bond, skb, &flow))
3015                 return bond_eth_hash(skb);
3016
3017         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3018             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3019                 hash = bond_eth_hash(skb);
3020         else
3021                 hash = (__force u32)flow.ports;
3022         hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3023         hash ^= (hash >> 16);
3024         hash ^= (hash >> 8);
3025
3026         return hash;
3027 }
3028
3029 /*-------------------------- Device entry points ----------------------------*/
3030
3031 static void bond_work_init_all(struct bonding *bond)
3032 {
3033         INIT_DELAYED_WORK(&bond->mcast_work,
3034                           bond_resend_igmp_join_requests_delayed);
3035         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3036         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3037         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3038                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3039         else
3040                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3041         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3042         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3043 }
3044
3045 static void bond_work_cancel_all(struct bonding *bond)
3046 {
3047         cancel_delayed_work_sync(&bond->mii_work);
3048         cancel_delayed_work_sync(&bond->arp_work);
3049         cancel_delayed_work_sync(&bond->alb_work);
3050         cancel_delayed_work_sync(&bond->ad_work);
3051         cancel_delayed_work_sync(&bond->mcast_work);
3052         cancel_delayed_work_sync(&bond->slave_arr_work);
3053 }
3054
3055 static int bond_open(struct net_device *bond_dev)
3056 {
3057         struct bonding *bond = netdev_priv(bond_dev);
3058         struct list_head *iter;
3059         struct slave *slave;
3060
3061         /* reset slave->backup and slave->inactive */
3062         if (bond_has_slaves(bond)) {
3063                 bond_for_each_slave(bond, slave, iter) {
3064                         if (bond_uses_primary(bond) &&
3065                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3066                                 bond_set_slave_inactive_flags(slave,
3067                                                               BOND_SLAVE_NOTIFY_NOW);
3068                         } else {
3069                                 bond_set_slave_active_flags(slave,
3070                                                             BOND_SLAVE_NOTIFY_NOW);
3071                         }
3072                 }
3073         }
3074
3075         bond_work_init_all(bond);
3076
3077         if (bond_is_lb(bond)) {
3078                 /* bond_alb_initialize must be called before the timer
3079                  * is started.
3080                  */
3081                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3082                         return -ENOMEM;
3083                 if (bond->params.tlb_dynamic_lb)
3084                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3085         }
3086
3087         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3088                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3089
3090         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3091                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3092                 bond->recv_probe = bond_arp_rcv;
3093         }
3094
3095         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3096                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3097                 /* register to receive LACPDUs */
3098                 bond->recv_probe = bond_3ad_lacpdu_recv;
3099                 bond_3ad_initiate_agg_selection(bond, 1);
3100         }
3101
3102         if (bond_mode_uses_xmit_hash(bond))
3103                 bond_update_slave_arr(bond, NULL);
3104
3105         return 0;
3106 }
3107
3108 static int bond_close(struct net_device *bond_dev)
3109 {
3110         struct bonding *bond = netdev_priv(bond_dev);
3111
3112         bond_work_cancel_all(bond);
3113         bond->send_peer_notif = 0;
3114         if (bond_is_lb(bond))
3115                 bond_alb_deinitialize(bond);
3116         bond->recv_probe = NULL;
3117
3118         return 0;
3119 }
3120
3121 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3122                                                 struct rtnl_link_stats64 *stats)
3123 {
3124         struct bonding *bond = netdev_priv(bond_dev);
3125         struct rtnl_link_stats64 temp;
3126         struct list_head *iter;
3127         struct slave *slave;
3128
3129         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3130
3131         bond_for_each_slave(bond, slave, iter) {
3132                 const struct rtnl_link_stats64 *sstats =
3133                         dev_get_stats(slave->dev, &temp);
3134                 struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3135
3136                 stats->rx_packets +=  sstats->rx_packets - pstats->rx_packets;
3137                 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3138                 stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3139                 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3140
3141                 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3142                 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3143                 stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3144                 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3145
3146                 stats->multicast += sstats->multicast - pstats->multicast;
3147                 stats->collisions += sstats->collisions - pstats->collisions;
3148
3149                 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3150                 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3151                 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3152                 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3153                 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3154                 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3155
3156                 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3157                 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3158                 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3159                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3160                 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3161
3162                 /* save off the slave stats for the next run */
3163                 memcpy(pstats, sstats, sizeof(*sstats));
3164         }
3165         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3166
3167         return stats;
3168 }
3169
3170 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3171 {
3172         struct bonding *bond = netdev_priv(bond_dev);
3173         struct net_device *slave_dev = NULL;
3174         struct ifbond k_binfo;
3175         struct ifbond __user *u_binfo = NULL;
3176         struct ifslave k_sinfo;
3177         struct ifslave __user *u_sinfo = NULL;
3178         struct mii_ioctl_data *mii = NULL;
3179         struct bond_opt_value newval;
3180         struct net *net;
3181         int res = 0;
3182
3183         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3184
3185         switch (cmd) {
3186         case SIOCGMIIPHY:
3187                 mii = if_mii(ifr);
3188                 if (!mii)
3189                         return -EINVAL;
3190
3191                 mii->phy_id = 0;
3192                 /* Fall Through */
3193         case SIOCGMIIREG:
3194                 /* We do this again just in case we were called by SIOCGMIIREG
3195                  * instead of SIOCGMIIPHY.
3196                  */
3197                 mii = if_mii(ifr);
3198                 if (!mii)
3199                         return -EINVAL;
3200
3201                 if (mii->reg_num == 1) {
3202                         mii->val_out = 0;
3203                         if (netif_carrier_ok(bond->dev))
3204                                 mii->val_out = BMSR_LSTATUS;
3205                 }
3206
3207                 return 0;
3208         case BOND_INFO_QUERY_OLD:
3209         case SIOCBONDINFOQUERY:
3210                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3211
3212                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3213                         return -EFAULT;
3214
3215                 res = bond_info_query(bond_dev, &k_binfo);
3216                 if (res == 0 &&
3217                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3218                         return -EFAULT;
3219
3220                 return res;
3221         case BOND_SLAVE_INFO_QUERY_OLD:
3222         case SIOCBONDSLAVEINFOQUERY:
3223                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3224
3225                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3226                         return -EFAULT;
3227
3228                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3229                 if (res == 0 &&
3230                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3231                         return -EFAULT;
3232
3233                 return res;
3234         default:
3235                 break;
3236         }
3237
3238         net = dev_net(bond_dev);
3239
3240         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3241                 return -EPERM;
3242
3243         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3244
3245         netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3246
3247         if (!slave_dev)
3248                 return -ENODEV;
3249
3250         netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3251         switch (cmd) {
3252         case BOND_ENSLAVE_OLD:
3253         case SIOCBONDENSLAVE:
3254                 res = bond_enslave(bond_dev, slave_dev);
3255                 break;
3256         case BOND_RELEASE_OLD:
3257         case SIOCBONDRELEASE:
3258                 res = bond_release(bond_dev, slave_dev);
3259                 break;
3260         case BOND_SETHWADDR_OLD:
3261         case SIOCBONDSETHWADDR:
3262                 bond_set_dev_addr(bond_dev, slave_dev);
3263                 res = 0;
3264                 break;
3265         case BOND_CHANGE_ACTIVE_OLD:
3266         case SIOCBONDCHANGEACTIVE:
3267                 bond_opt_initstr(&newval, slave_dev->name);
3268                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3269                 break;
3270         default:
3271                 res = -EOPNOTSUPP;
3272         }
3273
3274         return res;
3275 }
3276
3277 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3278 {
3279         struct bonding *bond = netdev_priv(bond_dev);
3280
3281         if (change & IFF_PROMISC)
3282                 bond_set_promiscuity(bond,
3283                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3284
3285         if (change & IFF_ALLMULTI)
3286                 bond_set_allmulti(bond,
3287                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3288 }
3289
3290 static void bond_set_rx_mode(struct net_device *bond_dev)
3291 {
3292         struct bonding *bond = netdev_priv(bond_dev);
3293         struct list_head *iter;
3294         struct slave *slave;
3295
3296         rcu_read_lock();
3297         if (bond_uses_primary(bond)) {
3298                 slave = rcu_dereference(bond->curr_active_slave);
3299                 if (slave) {
3300                         dev_uc_sync(slave->dev, bond_dev);
3301                         dev_mc_sync(slave->dev, bond_dev);
3302                 }
3303         } else {
3304                 bond_for_each_slave_rcu(bond, slave, iter) {
3305                         dev_uc_sync_multiple(slave->dev, bond_dev);
3306                         dev_mc_sync_multiple(slave->dev, bond_dev);
3307                 }
3308         }
3309         rcu_read_unlock();
3310 }
3311
3312 static int bond_neigh_init(struct neighbour *n)
3313 {
3314         struct bonding *bond = netdev_priv(n->dev);
3315         const struct net_device_ops *slave_ops;
3316         struct neigh_parms parms;
3317         struct slave *slave;
3318         int ret;
3319
3320         slave = bond_first_slave(bond);
3321         if (!slave)
3322                 return 0;
3323         slave_ops = slave->dev->netdev_ops;
3324         if (!slave_ops->ndo_neigh_setup)
3325                 return 0;
3326
3327         parms.neigh_setup = NULL;
3328         parms.neigh_cleanup = NULL;
3329         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3330         if (ret)
3331                 return ret;
3332
3333         /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3334          * after the last slave has been detached.  Assumes that all slaves
3335          * utilize the same neigh_cleanup (true at this writing as only user
3336          * is ipoib).
3337          */
3338         n->parms->neigh_cleanup = parms.neigh_cleanup;
3339
3340         if (!parms.neigh_setup)
3341                 return 0;
3342
3343         return parms.neigh_setup(n);
3344 }
3345
3346 /* The bonding ndo_neigh_setup is called at init time beofre any
3347  * slave exists. So we must declare proxy setup function which will
3348  * be used at run time to resolve the actual slave neigh param setup.
3349  *
3350  * It's also called by master devices (such as vlans) to setup their
3351  * underlying devices. In that case - do nothing, we're already set up from
3352  * our init.
3353  */
3354 static int bond_neigh_setup(struct net_device *dev,
3355                             struct neigh_parms *parms)
3356 {
3357         /* modify only our neigh_parms */
3358         if (parms->dev == dev)
3359                 parms->neigh_setup = bond_neigh_init;
3360
3361         return 0;
3362 }
3363
3364 /* Change the MTU of all of a master's slaves to match the master */
3365 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3366 {
3367         struct bonding *bond = netdev_priv(bond_dev);
3368         struct slave *slave, *rollback_slave;
3369         struct list_head *iter;
3370         int res = 0;
3371
3372         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3373
3374         bond_for_each_slave(bond, slave, iter) {
3375                 netdev_dbg(bond_dev, "s %p c_m %p\n",
3376                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3377
3378                 res = dev_set_mtu(slave->dev, new_mtu);
3379
3380                 if (res) {
3381                         /* If we failed to set the slave's mtu to the new value
3382                          * we must abort the operation even in ACTIVE_BACKUP
3383                          * mode, because if we allow the backup slaves to have
3384                          * different mtu values than the active slave we'll
3385                          * need to change their mtu when doing a failover. That
3386                          * means changing their mtu from timer context, which
3387                          * is probably not a good idea.
3388                          */
3389                         netdev_dbg(bond_dev, "err %d %s\n", res,
3390                                    slave->dev->name);
3391                         goto unwind;
3392                 }
3393         }
3394
3395         bond_dev->mtu = new_mtu;
3396
3397         return 0;
3398
3399 unwind:
3400         /* unwind from head to the slave that failed */
3401         bond_for_each_slave(bond, rollback_slave, iter) {
3402                 int tmp_res;
3403
3404                 if (rollback_slave == slave)
3405                         break;
3406
3407                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3408                 if (tmp_res) {
3409                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3410                                    tmp_res, rollback_slave->dev->name);
3411                 }
3412         }
3413
3414         return res;
3415 }
3416
3417 /* Change HW address
3418  *
3419  * Note that many devices must be down to change the HW address, and
3420  * downing the master releases all slaves.  We can make bonds full of
3421  * bonding devices to test this, however.
3422  */
3423 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3424 {
3425         struct bonding *bond = netdev_priv(bond_dev);
3426         struct slave *slave, *rollback_slave;
3427         struct sockaddr *sa = addr, tmp_sa;
3428         struct list_head *iter;
3429         int res = 0;
3430
3431         if (BOND_MODE(bond) == BOND_MODE_ALB)
3432                 return bond_alb_set_mac_address(bond_dev, addr);
3433
3434
3435         netdev_dbg(bond_dev, "bond=%p\n", bond);
3436
3437         /* If fail_over_mac is enabled, do nothing and return success.
3438          * Returning an error causes ifenslave to fail.
3439          */
3440         if (bond->params.fail_over_mac &&
3441             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3442                 return 0;
3443
3444         if (!is_valid_ether_addr(sa->sa_data))
3445                 return -EADDRNOTAVAIL;
3446
3447         bond_for_each_slave(bond, slave, iter) {
3448                 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3449                 res = dev_set_mac_address(slave->dev, addr);
3450                 if (res) {
3451                         /* TODO: consider downing the slave
3452                          * and retry ?
3453                          * User should expect communications
3454                          * breakage anyway until ARP finish
3455                          * updating, so...
3456                          */
3457                         netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3458                         goto unwind;
3459                 }
3460         }
3461
3462         /* success */
3463         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3464         return 0;
3465
3466 unwind:
3467         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3468         tmp_sa.sa_family = bond_dev->type;
3469
3470         /* unwind from head to the slave that failed */
3471         bond_for_each_slave(bond, rollback_slave, iter) {
3472                 int tmp_res;
3473
3474                 if (rollback_slave == slave)
3475                         break;
3476
3477                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3478                 if (tmp_res) {
3479                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3480                                    tmp_res, rollback_slave->dev->name);
3481                 }
3482         }
3483
3484         return res;
3485 }
3486
3487 /**
3488  * bond_xmit_slave_id - transmit skb through slave with slave_id
3489  * @bond: bonding device that is transmitting
3490  * @skb: buffer to transmit
3491  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3492  *
3493  * This function tries to transmit through slave with slave_id but in case
3494  * it fails, it tries to find the first available slave for transmission.
3495  * The skb is consumed in all cases, thus the function is void.
3496  */
3497 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3498 {
3499         struct list_head *iter;
3500         struct slave *slave;
3501         int i = slave_id;
3502
3503         /* Here we start from the slave with slave_id */
3504         bond_for_each_slave_rcu(bond, slave, iter) {
3505                 if (--i < 0) {
3506                         if (bond_slave_can_tx(slave)) {
3507                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3508                                 return;
3509                         }
3510                 }
3511         }
3512
3513         /* Here we start from the first slave up to slave_id */
3514         i = slave_id;
3515         bond_for_each_slave_rcu(bond, slave, iter) {
3516                 if (--i < 0)
3517                         break;
3518                 if (bond_slave_can_tx(slave)) {
3519                         bond_dev_queue_xmit(bond, skb, slave->dev);
3520                         return;
3521                 }
3522         }
3523         /* no slave that can tx has been found */
3524         bond_tx_drop(bond->dev, skb);
3525 }
3526
3527 /**
3528  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3529  * @bond: bonding device to use
3530  *
3531  * Based on the value of the bonding device's packets_per_slave parameter
3532  * this function generates a slave id, which is usually used as the next
3533  * slave to transmit through.
3534  */
3535 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3536 {
3537         u32 slave_id;
3538         struct reciprocal_value reciprocal_packets_per_slave;
3539         int packets_per_slave = bond->params.packets_per_slave;
3540
3541         switch (packets_per_slave) {
3542         case 0:
3543                 slave_id = prandom_u32();
3544                 break;
3545         case 1:
3546                 slave_id = bond->rr_tx_counter;
3547                 break;
3548         default:
3549                 reciprocal_packets_per_slave =
3550                         bond->params.reciprocal_packets_per_slave;
3551                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3552                                              reciprocal_packets_per_slave);
3553                 break;
3554         }
3555         bond->rr_tx_counter++;
3556
3557         return slave_id;
3558 }
3559
3560 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3561 {
3562         struct bonding *bond = netdev_priv(bond_dev);
3563         struct iphdr *iph = ip_hdr(skb);
3564         struct slave *slave;
3565         u32 slave_id;
3566
3567         /* Start with the curr_active_slave that joined the bond as the
3568          * default for sending IGMP traffic.  For failover purposes one
3569          * needs to maintain some consistency for the interface that will
3570          * send the join/membership reports.  The curr_active_slave found
3571          * will send all of this type of traffic.
3572          */
3573         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3574                 slave = rcu_dereference(bond->curr_active_slave);
3575                 if (slave)
3576                         bond_dev_queue_xmit(bond, skb, slave->dev);
3577                 else
3578                         bond_xmit_slave_id(bond, skb, 0);
3579         } else {
3580                 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3581
3582                 if (likely(slave_cnt)) {
3583                         slave_id = bond_rr_gen_slave_id(bond);
3584                         bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3585                 } else {
3586                         bond_tx_drop(bond_dev, skb);
3587                 }
3588         }
3589
3590         return NETDEV_TX_OK;
3591 }
3592
3593 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3594  * the bond has a usable interface.
3595  */
3596 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3597 {
3598         struct bonding *bond = netdev_priv(bond_dev);
3599         struct slave *slave;
3600
3601         slave = rcu_dereference(bond->curr_active_slave);
3602         if (slave)
3603                 bond_dev_queue_xmit(bond, skb, slave->dev);
3604         else
3605                 bond_tx_drop(bond_dev, skb);
3606
3607         return NETDEV_TX_OK;
3608 }
3609
3610 /* Use this to update slave_array when (a) it's not appropriate to update
3611  * slave_array right away (note that update_slave_array() may sleep)
3612  * and / or (b) RTNL is not held.
3613  */
3614 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3615 {
3616         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3617 }
3618
3619 /* Slave array work handler. Holds only RTNL */
3620 static void bond_slave_arr_handler(struct work_struct *work)
3621 {
3622         struct bonding *bond = container_of(work, struct bonding,
3623                                             slave_arr_work.work);
3624         int ret;
3625
3626         if (!rtnl_trylock())
3627                 goto err;
3628
3629         ret = bond_update_slave_arr(bond, NULL);
3630         rtnl_unlock();
3631         if (ret) {
3632                 pr_warn_ratelimited("Failed to update slave array from WT\n");
3633                 goto err;
3634         }
3635         return;
3636
3637 err:
3638         bond_slave_arr_work_rearm(bond, 1);
3639 }
3640
3641 /* Build the usable slaves array in control path for modes that use xmit-hash
3642  * to determine the slave interface -
3643  * (a) BOND_MODE_8023AD
3644  * (b) BOND_MODE_XOR
3645  * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3646  *
3647  * The caller is expected to hold RTNL only and NO other lock!
3648  */
3649 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3650 {
3651         struct slave *slave;
3652         struct list_head *iter;
3653         struct bond_up_slave *new_arr, *old_arr;
3654         int slaves_in_agg;
3655         int agg_id = 0;
3656         int ret = 0;
3657
3658 #ifdef CONFIG_LOCKDEP
3659         WARN_ON(lockdep_is_held(&bond->mode_lock));
3660 #endif
3661
3662         new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3663                           GFP_KERNEL);
3664         if (!new_arr) {
3665                 ret = -ENOMEM;
3666                 pr_err("Failed to build slave-array.\n");
3667                 goto out;
3668         }
3669         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3670                 struct ad_info ad_info;
3671
3672                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3673                         pr_debug("bond_3ad_get_active_agg_info failed\n");
3674                         kfree_rcu(new_arr, rcu);
3675                         /* No active aggragator means it's not safe to use
3676                          * the previous array.
3677                          */
3678                         old_arr = rtnl_dereference(bond->slave_arr);
3679                         if (old_arr) {
3680                                 RCU_INIT_POINTER(bond->slave_arr, NULL);
3681                                 kfree_rcu(old_arr, rcu);
3682                         }
3683                         goto out;
3684                 }
3685                 slaves_in_agg = ad_info.ports;
3686                 agg_id = ad_info.aggregator_id;
3687         }
3688         bond_for_each_slave(bond, slave, iter) {
3689                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3690                         struct aggregator *agg;
3691
3692                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
3693                         if (!agg || agg->aggregator_identifier != agg_id)
3694                                 continue;
3695                 }
3696                 if (!bond_slave_can_tx(slave))
3697                         continue;
3698                 if (skipslave == slave)
3699                         continue;
3700                 new_arr->arr[new_arr->count++] = slave;
3701         }
3702
3703         old_arr = rtnl_dereference(bond->slave_arr);
3704         rcu_assign_pointer(bond->slave_arr, new_arr);
3705         if (old_arr)
3706                 kfree_rcu(old_arr, rcu);
3707 out:
3708         if (ret != 0 && skipslave) {
3709                 int idx;
3710
3711                 /* Rare situation where caller has asked to skip a specific
3712                  * slave but allocation failed (most likely!). BTW this is
3713                  * only possible when the call is initiated from
3714                  * __bond_release_one(). In this situation; overwrite the
3715                  * skipslave entry in the array with the last entry from the
3716                  * array to avoid a situation where the xmit path may choose
3717                  * this to-be-skipped slave to send a packet out.
3718                  */
3719                 old_arr = rtnl_dereference(bond->slave_arr);
3720                 for (idx = 0; idx < old_arr->count; idx++) {
3721                         if (skipslave == old_arr->arr[idx]) {
3722                                 old_arr->arr[idx] =
3723                                     old_arr->arr[old_arr->count-1];
3724                                 old_arr->count--;
3725                                 break;
3726                         }
3727                 }
3728         }
3729         return ret;
3730 }
3731
3732 /* Use this Xmit function for 3AD as well as XOR modes. The current
3733  * usable slave array is formed in the control path. The xmit function
3734  * just calculates hash and sends the packet out.
3735  */
3736 int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3737 {
3738         struct bonding *bond = netdev_priv(dev);
3739         struct slave *slave;
3740         struct bond_up_slave *slaves;
3741         unsigned int count;
3742
3743         slaves = rcu_dereference(bond->slave_arr);
3744         count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3745         if (likely(count)) {
3746                 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3747                 bond_dev_queue_xmit(bond, skb, slave->dev);
3748         } else {
3749                 bond_tx_drop(dev, skb);
3750         }
3751
3752         return NETDEV_TX_OK;
3753 }
3754
3755 /* in broadcast mode, we send everything to all usable interfaces. */
3756 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3757 {
3758         struct bonding *bond = netdev_priv(bond_dev);
3759         struct slave *slave = NULL;
3760         struct list_head *iter;
3761
3762         bond_for_each_slave_rcu(bond, slave, iter) {
3763                 if (bond_is_last_slave(bond, slave))
3764                         break;
3765                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3766                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3767
3768                         if (!skb2) {
3769                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3770                                                     bond_dev->name, __func__);
3771                                 continue;
3772                         }
3773                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3774                 }
3775         }
3776         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3777                 bond_dev_queue_xmit(bond, skb, slave->dev);
3778         else
3779                 bond_tx_drop(bond_dev, skb);
3780
3781         return NETDEV_TX_OK;
3782 }
3783
3784 /*------------------------- Device initialization ---------------------------*/
3785
3786 /* Lookup the slave that corresponds to a qid */
3787 static inline int bond_slave_override(struct bonding *bond,
3788                                       struct sk_buff *skb)
3789 {
3790         struct slave *slave = NULL;
3791         struct list_head *iter;
3792
3793         if (!skb->queue_mapping)
3794                 return 1;
3795
3796         /* Find out if any slaves have the same mapping as this skb. */
3797         bond_for_each_slave_rcu(bond, slave, iter) {
3798                 if (slave->queue_id == skb->queue_mapping) {
3799                         if (bond_slave_can_tx(slave)) {
3800                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3801                                 return 0;
3802                         }
3803                         /* If the slave isn't UP, use default transmit policy. */
3804                         break;
3805                 }
3806         }
3807
3808         return 1;
3809 }
3810
3811
3812 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3813                              void *accel_priv, select_queue_fallback_t fallback)
3814 {
3815         /* This helper function exists to help dev_pick_tx get the correct
3816          * destination queue.  Using a helper function skips a call to
3817          * skb_tx_hash and will put the skbs in the queue we expect on their
3818          * way down to the bonding driver.
3819          */
3820         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3821
3822         /* Save the original txq to restore before passing to the driver */
3823         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3824
3825         if (unlikely(txq >= dev->real_num_tx_queues)) {
3826                 do {
3827                         txq -= dev->real_num_tx_queues;
3828                 } while (txq >= dev->real_num_tx_queues);
3829         }
3830         return txq;
3831 }
3832
3833 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3834 {
3835         struct bonding *bond = netdev_priv(dev);
3836
3837         if (bond_should_override_tx_queue(bond) &&
3838             !bond_slave_override(bond, skb))
3839                 return NETDEV_TX_OK;
3840
3841         switch (BOND_MODE(bond)) {
3842         case BOND_MODE_ROUNDROBIN:
3843                 return bond_xmit_roundrobin(skb, dev);
3844         case BOND_MODE_ACTIVEBACKUP:
3845                 return bond_xmit_activebackup(skb, dev);
3846         case BOND_MODE_8023AD:
3847         case BOND_MODE_XOR:
3848                 return bond_3ad_xor_xmit(skb, dev);
3849         case BOND_MODE_BROADCAST:
3850                 return bond_xmit_broadcast(skb, dev);
3851         case BOND_MODE_ALB:
3852                 return bond_alb_xmit(skb, dev);
3853         case BOND_MODE_TLB:
3854                 return bond_tlb_xmit(skb, dev);
3855         default:
3856                 /* Should never happen, mode already checked */
3857                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
3858                 WARN_ON_ONCE(1);
3859                 bond_tx_drop(dev, skb);
3860                 return NETDEV_TX_OK;
3861         }
3862 }
3863
3864 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3865 {
3866         struct bonding *bond = netdev_priv(dev);
3867         netdev_tx_t ret = NETDEV_TX_OK;
3868
3869         /* If we risk deadlock from transmitting this in the
3870          * netpoll path, tell netpoll to queue the frame for later tx
3871          */
3872         if (unlikely(is_netpoll_tx_blocked(dev)))
3873                 return NETDEV_TX_BUSY;
3874
3875         rcu_read_lock();
3876         if (bond_has_slaves(bond))
3877                 ret = __bond_start_xmit(skb, dev);
3878         else
3879                 bond_tx_drop(dev, skb);
3880         rcu_read_unlock();
3881
3882         return ret;
3883 }
3884
3885 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3886                                      struct ethtool_cmd *ecmd)
3887 {
3888         struct bonding *bond = netdev_priv(bond_dev);
3889         unsigned long speed = 0;
3890         struct list_head *iter;
3891         struct slave *slave;
3892
3893         ecmd->duplex = DUPLEX_UNKNOWN;
3894         ecmd->port = PORT_OTHER;
3895
3896         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
3897          * do not need to check mode.  Though link speed might not represent
3898          * the true receive or transmit bandwidth (not all modes are symmetric)
3899          * this is an accurate maximum.
3900          */
3901         bond_for_each_slave(bond, slave, iter) {
3902                 if (bond_slave_can_tx(slave)) {
3903                         if (slave->speed != SPEED_UNKNOWN)
3904                                 speed += slave->speed;
3905                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3906                             slave->duplex != DUPLEX_UNKNOWN)
3907                                 ecmd->duplex = slave->duplex;
3908                 }
3909         }
3910         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3911
3912         return 0;
3913 }
3914
3915 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3916                                      struct ethtool_drvinfo *drvinfo)
3917 {
3918         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3919         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3920         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3921                  BOND_ABI_VERSION);
3922 }
3923
3924 static const struct ethtool_ops bond_ethtool_ops = {
3925         .get_drvinfo            = bond_ethtool_get_drvinfo,
3926         .get_settings           = bond_ethtool_get_settings,
3927         .get_link               = ethtool_op_get_link,
3928 };
3929
3930 static const struct net_device_ops bond_netdev_ops = {
3931         .ndo_init               = bond_init,
3932         .ndo_uninit             = bond_uninit,
3933         .ndo_open               = bond_open,
3934         .ndo_stop               = bond_close,
3935         .ndo_start_xmit         = bond_start_xmit,
3936         .ndo_select_queue       = bond_select_queue,
3937         .ndo_get_stats64        = bond_get_stats,
3938         .ndo_do_ioctl           = bond_do_ioctl,
3939         .ndo_change_rx_flags    = bond_change_rx_flags,
3940         .ndo_set_rx_mode        = bond_set_rx_mode,
3941         .ndo_change_mtu         = bond_change_mtu,
3942         .ndo_set_mac_address    = bond_set_mac_address,
3943         .ndo_neigh_setup        = bond_neigh_setup,
3944         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3945         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3946 #ifdef CONFIG_NET_POLL_CONTROLLER
3947         .ndo_netpoll_setup      = bond_netpoll_setup,
3948         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
3949         .ndo_poll_controller    = bond_poll_controller,
3950 #endif
3951         .ndo_add_slave          = bond_enslave,
3952         .ndo_del_slave          = bond_release,
3953         .ndo_fix_features       = bond_fix_features,
3954 };
3955
3956 static const struct device_type bond_type = {
3957         .name = "bond",
3958 };
3959
3960 static void bond_destructor(struct net_device *bond_dev)
3961 {
3962         struct bonding *bond = netdev_priv(bond_dev);
3963         if (bond->wq)
3964                 destroy_workqueue(bond->wq);
3965         free_netdev(bond_dev);
3966 }
3967
3968 void bond_setup(struct net_device *bond_dev)
3969 {
3970         struct bonding *bond = netdev_priv(bond_dev);
3971
3972         spin_lock_init(&bond->mode_lock);
3973         bond->params = bonding_defaults;
3974
3975         /* Initialize pointers */
3976         bond->dev = bond_dev;
3977
3978         /* Initialize the device entry points */
3979         ether_setup(bond_dev);
3980         bond_dev->netdev_ops = &bond_netdev_ops;
3981         bond_dev->ethtool_ops = &bond_ethtool_ops;
3982
3983         bond_dev->destructor = bond_destructor;
3984
3985         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3986
3987         /* Initialize the device options */
3988         bond_dev->tx_queue_len = 0;
3989         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3990         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
3991         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3992
3993         /* don't acquire bond device's netif_tx_lock when transmitting */
3994         bond_dev->features |= NETIF_F_LLTX;
3995
3996         /* By default, we declare the bond to be fully
3997          * VLAN hardware accelerated capable. Special
3998          * care is taken in the various xmit functions
3999          * when there are slaves that are not hw accel
4000          * capable
4001          */
4002
4003         /* Don't allow bond devices to change network namespaces. */
4004         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4005
4006         bond_dev->hw_features = BOND_VLAN_FEATURES |
4007                                 NETIF_F_HW_VLAN_CTAG_TX |
4008                                 NETIF_F_HW_VLAN_CTAG_RX |
4009                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4010
4011         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4012         bond_dev->hw_features |= NETIF_F_GSO_UDP_TUNNEL;
4013         bond_dev->features |= bond_dev->hw_features;
4014 }
4015
4016 /* Destroy a bonding device.
4017  * Must be under rtnl_lock when this function is called.
4018  */
4019 static void bond_uninit(struct net_device *bond_dev)
4020 {
4021         struct bonding *bond = netdev_priv(bond_dev);
4022         struct list_head *iter;
4023         struct slave *slave;
4024         struct bond_up_slave *arr;
4025
4026         bond_netpoll_cleanup(bond_dev);
4027
4028         /* Release the bonded slaves */
4029         bond_for_each_slave(bond, slave, iter)
4030                 __bond_release_one(bond_dev, slave->dev, true);
4031         netdev_info(bond_dev, "Released all slaves\n");
4032
4033         arr = rtnl_dereference(bond->slave_arr);
4034         if (arr) {
4035                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4036                 kfree_rcu(arr, rcu);
4037         }
4038
4039         list_del(&bond->bond_list);
4040
4041         bond_debug_unregister(bond);
4042 }
4043
4044 /*------------------------- Module initialization ---------------------------*/
4045
4046 static int bond_check_params(struct bond_params *params)
4047 {
4048         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4049         struct bond_opt_value newval;
4050         const struct bond_opt_value *valptr;
4051         int arp_all_targets_value;
4052
4053         /* Convert string parameters. */
4054         if (mode) {
4055                 bond_opt_initstr(&newval, mode);
4056                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4057                 if (!valptr) {
4058                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4059                         return -EINVAL;
4060                 }
4061                 bond_mode = valptr->value;
4062         }
4063
4064         if (xmit_hash_policy) {
4065                 if ((bond_mode != BOND_MODE_XOR) &&
4066                     (bond_mode != BOND_MODE_8023AD) &&
4067                     (bond_mode != BOND_MODE_TLB)) {
4068                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4069                                 bond_mode_name(bond_mode));
4070                 } else {
4071                         bond_opt_initstr(&newval, xmit_hash_policy);
4072                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4073                                                 &newval);
4074                         if (!valptr) {
4075                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4076                                        xmit_hash_policy);
4077                                 return -EINVAL;
4078                         }
4079                         xmit_hashtype = valptr->value;
4080                 }
4081         }
4082
4083         if (lacp_rate) {
4084                 if (bond_mode != BOND_MODE_8023AD) {
4085                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4086                                 bond_mode_name(bond_mode));
4087                 } else {
4088                         bond_opt_initstr(&newval, lacp_rate);
4089                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4090                                                 &newval);
4091                         if (!valptr) {
4092                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4093                                        lacp_rate);
4094                                 return -EINVAL;
4095                         }
4096                         lacp_fast = valptr->value;
4097                 }
4098         }
4099
4100         if (ad_select) {
4101                 bond_opt_initstr(&newval, ad_select);
4102                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4103                                         &newval);
4104                 if (!valptr) {
4105                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4106                         return -EINVAL;
4107                 }
4108                 params->ad_select = valptr->value;
4109                 if (bond_mode != BOND_MODE_8023AD)
4110                         pr_warn("ad_select param only affects 802.3ad mode\n");
4111         } else {
4112                 params->ad_select = BOND_AD_STABLE;
4113         }
4114
4115         if (max_bonds < 0) {
4116                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4117                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4118                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4119         }
4120
4121         if (miimon < 0) {
4122                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4123                         miimon, INT_MAX);
4124                 miimon = 0;
4125         }
4126
4127         if (updelay < 0) {
4128                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4129                         updelay, INT_MAX);
4130                 updelay = 0;
4131         }
4132
4133         if (downdelay < 0) {
4134                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4135                         downdelay, INT_MAX);
4136                 downdelay = 0;
4137         }
4138
4139         if ((use_carrier != 0) && (use_carrier != 1)) {
4140                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4141                         use_carrier);
4142                 use_carrier = 1;
4143         }
4144
4145         if (num_peer_notif < 0 || num_peer_notif > 255) {
4146                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4147                         num_peer_notif);
4148                 num_peer_notif = 1;
4149         }
4150
4151         /* reset values for 802.3ad/TLB/ALB */
4152         if (!bond_mode_uses_arp(bond_mode)) {
4153                 if (!miimon) {
4154                         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");
4155                         pr_warn("Forcing miimon to 100msec\n");
4156                         miimon = BOND_DEFAULT_MIIMON;
4157                 }
4158         }
4159
4160         if (tx_queues < 1 || tx_queues > 255) {
4161                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4162                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4163                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4164         }
4165
4166         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4167                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4168                         all_slaves_active);
4169                 all_slaves_active = 0;
4170         }
4171
4172         if (resend_igmp < 0 || resend_igmp > 255) {
4173                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4174                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4175                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4176         }
4177
4178         bond_opt_initval(&newval, packets_per_slave);
4179         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4180                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4181                         packets_per_slave, USHRT_MAX);
4182                 packets_per_slave = 1;
4183         }
4184
4185         if (bond_mode == BOND_MODE_ALB) {
4186                 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",
4187                           updelay);
4188         }
4189
4190         if (!miimon) {
4191                 if (updelay || downdelay) {
4192                         /* just warn the user the up/down delay will have
4193                          * no effect since miimon is zero...
4194                          */
4195                         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",
4196                                 updelay, downdelay);
4197                 }
4198         } else {
4199                 /* don't allow arp monitoring */
4200                 if (arp_interval) {
4201                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4202                                 miimon, arp_interval);
4203                         arp_interval = 0;
4204                 }
4205
4206                 if ((updelay % miimon) != 0) {
4207                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4208                                 updelay, miimon, (updelay / miimon) * miimon);
4209                 }
4210
4211                 updelay /= miimon;
4212
4213                 if ((downdelay % miimon) != 0) {
4214                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4215                                 downdelay, miimon,
4216                                 (downdelay / miimon) * miimon);
4217                 }
4218
4219                 downdelay /= miimon;
4220         }
4221
4222         if (arp_interval < 0) {
4223                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4224                         arp_interval, INT_MAX);
4225                 arp_interval = 0;
4226         }
4227
4228         for (arp_ip_count = 0, i = 0;
4229              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4230                 __be32 ip;
4231
4232                 /* not a complete check, but good enough to catch mistakes */
4233                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4234                     !bond_is_ip_target_ok(ip)) {
4235                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4236                                 arp_ip_target[i]);
4237                         arp_interval = 0;
4238                 } else {
4239                         if (bond_get_targets_ip(arp_target, ip) == -1)
4240                                 arp_target[arp_ip_count++] = ip;
4241                         else
4242                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4243                                         &ip);
4244                 }
4245         }
4246
4247         if (arp_interval && !arp_ip_count) {
4248                 /* don't allow arping if no arp_ip_target given... */
4249                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4250                         arp_interval);
4251                 arp_interval = 0;
4252         }
4253
4254         if (arp_validate) {
4255                 if (!arp_interval) {
4256                         pr_err("arp_validate requires arp_interval\n");
4257                         return -EINVAL;
4258                 }
4259
4260                 bond_opt_initstr(&newval, arp_validate);
4261                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4262                                         &newval);
4263                 if (!valptr) {
4264                         pr_err("Error: invalid arp_validate \"%s\"\n",
4265                                arp_validate);
4266                         return -EINVAL;
4267                 }
4268                 arp_validate_value = valptr->value;
4269         } else {
4270                 arp_validate_value = 0;
4271         }
4272
4273         arp_all_targets_value = 0;
4274         if (arp_all_targets) {
4275                 bond_opt_initstr(&newval, arp_all_targets);
4276                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4277                                         &newval);
4278                 if (!valptr) {
4279                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4280                                arp_all_targets);
4281                         arp_all_targets_value = 0;
4282                 } else {
4283                         arp_all_targets_value = valptr->value;
4284                 }
4285         }
4286
4287         if (miimon) {
4288                 pr_info("MII link monitoring set to %d ms\n", miimon);
4289         } else if (arp_interval) {
4290                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4291                                           arp_validate_value);
4292                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4293                         arp_interval, valptr->string, arp_ip_count);
4294
4295                 for (i = 0; i < arp_ip_count; i++)
4296                         pr_cont(" %s", arp_ip_target[i]);
4297
4298                 pr_cont("\n");
4299
4300         } else if (max_bonds) {
4301                 /* miimon and arp_interval not set, we need one so things
4302                  * work as expected, see bonding.txt for details
4303                  */
4304                 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");
4305         }
4306
4307         if (primary && !bond_mode_uses_primary(bond_mode)) {
4308                 /* currently, using a primary only makes sense
4309                  * in active backup, TLB or ALB modes
4310                  */
4311                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4312                         primary, bond_mode_name(bond_mode));
4313                 primary = NULL;
4314         }
4315
4316         if (primary && primary_reselect) {
4317                 bond_opt_initstr(&newval, primary_reselect);
4318                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4319                                         &newval);
4320                 if (!valptr) {
4321                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4322                                primary_reselect);
4323                         return -EINVAL;
4324                 }
4325                 primary_reselect_value = valptr->value;
4326         } else {
4327                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4328         }
4329
4330         if (fail_over_mac) {
4331                 bond_opt_initstr(&newval, fail_over_mac);
4332                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4333                                         &newval);
4334                 if (!valptr) {
4335                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4336                                fail_over_mac);
4337                         return -EINVAL;
4338                 }
4339                 fail_over_mac_value = valptr->value;
4340                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4341                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4342         } else {
4343                 fail_over_mac_value = BOND_FOM_NONE;
4344         }
4345
4346         if (lp_interval == 0) {
4347                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4348                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4349                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4350         }
4351
4352         /* fill params struct with the proper values */
4353         params->mode = bond_mode;
4354         params->xmit_policy = xmit_hashtype;
4355         params->miimon = miimon;
4356         params->num_peer_notif = num_peer_notif;
4357         params->arp_interval = arp_interval;
4358         params->arp_validate = arp_validate_value;
4359         params->arp_all_targets = arp_all_targets_value;
4360         params->updelay = updelay;
4361         params->downdelay = downdelay;
4362         params->use_carrier = use_carrier;
4363         params->lacp_fast = lacp_fast;
4364         params->primary[0] = 0;
4365         params->primary_reselect = primary_reselect_value;
4366         params->fail_over_mac = fail_over_mac_value;
4367         params->tx_queues = tx_queues;
4368         params->all_slaves_active = all_slaves_active;
4369         params->resend_igmp = resend_igmp;
4370         params->min_links = min_links;
4371         params->lp_interval = lp_interval;
4372         params->packets_per_slave = packets_per_slave;
4373         params->tlb_dynamic_lb = 1; /* Default value */
4374         if (packets_per_slave > 0) {
4375                 params->reciprocal_packets_per_slave =
4376                         reciprocal_value(packets_per_slave);
4377         } else {
4378                 /* reciprocal_packets_per_slave is unused if
4379                  * packets_per_slave is 0 or 1, just initialize it
4380                  */
4381                 params->reciprocal_packets_per_slave =
4382                         (struct reciprocal_value) { 0 };
4383         }
4384
4385         if (primary) {
4386                 strncpy(params->primary, primary, IFNAMSIZ);
4387                 params->primary[IFNAMSIZ - 1] = 0;
4388         }
4389
4390         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4391
4392         return 0;
4393 }
4394
4395 static struct lock_class_key bonding_netdev_xmit_lock_key;
4396 static struct lock_class_key bonding_netdev_addr_lock_key;
4397 static struct lock_class_key bonding_tx_busylock_key;
4398
4399 static void bond_set_lockdep_class_one(struct net_device *dev,
4400                                        struct netdev_queue *txq,
4401                                        void *_unused)
4402 {
4403         lockdep_set_class(&txq->_xmit_lock,
4404                           &bonding_netdev_xmit_lock_key);
4405 }
4406
4407 static void bond_set_lockdep_class(struct net_device *dev)
4408 {
4409         lockdep_set_class(&dev->addr_list_lock,
4410                           &bonding_netdev_addr_lock_key);
4411         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4412         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4413 }
4414
4415 /* Called from registration process */
4416 static int bond_init(struct net_device *bond_dev)
4417 {
4418         struct bonding *bond = netdev_priv(bond_dev);
4419         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4420
4421         netdev_dbg(bond_dev, "Begin bond_init\n");
4422
4423         bond->wq = create_singlethread_workqueue(bond_dev->name);
4424         if (!bond->wq)
4425                 return -ENOMEM;
4426
4427         bond_set_lockdep_class(bond_dev);
4428
4429         list_add_tail(&bond->bond_list, &bn->dev_list);
4430
4431         bond_prepare_sysfs_group(bond);
4432
4433         bond_debug_register(bond);
4434
4435         /* Ensure valid dev_addr */
4436         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4437             bond_dev->addr_assign_type == NET_ADDR_PERM)
4438                 eth_hw_addr_random(bond_dev);
4439
4440         return 0;
4441 }
4442
4443 unsigned int bond_get_num_tx_queues(void)
4444 {
4445         return tx_queues;
4446 }
4447
4448 /* Create a new bond based on the specified name and bonding parameters.
4449  * If name is NULL, obtain a suitable "bond%d" name for us.
4450  * Caller must NOT hold rtnl_lock; we need to release it here before we
4451  * set up our sysfs entries.
4452  */
4453 int bond_create(struct net *net, const char *name)
4454 {
4455         struct net_device *bond_dev;
4456         int res;
4457
4458         rtnl_lock();
4459
4460         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4461                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4462                                    bond_setup, tx_queues);
4463         if (!bond_dev) {
4464                 pr_err("%s: eek! can't alloc netdev!\n", name);
4465                 rtnl_unlock();
4466                 return -ENOMEM;
4467         }
4468
4469         dev_net_set(bond_dev, net);
4470         bond_dev->rtnl_link_ops = &bond_link_ops;
4471
4472         res = register_netdevice(bond_dev);
4473
4474         netif_carrier_off(bond_dev);
4475
4476         rtnl_unlock();
4477         if (res < 0)
4478                 bond_destructor(bond_dev);
4479         return res;
4480 }
4481
4482 static int __net_init bond_net_init(struct net *net)
4483 {
4484         struct bond_net *bn = net_generic(net, bond_net_id);
4485
4486         bn->net = net;
4487         INIT_LIST_HEAD(&bn->dev_list);
4488
4489         bond_create_proc_dir(bn);
4490         bond_create_sysfs(bn);
4491
4492         return 0;
4493 }
4494
4495 static void __net_exit bond_net_exit(struct net *net)
4496 {
4497         struct bond_net *bn = net_generic(net, bond_net_id);
4498         struct bonding *bond, *tmp_bond;
4499         LIST_HEAD(list);
4500
4501         bond_destroy_sysfs(bn);
4502
4503         /* Kill off any bonds created after unregistering bond rtnl ops */
4504         rtnl_lock();
4505         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4506                 unregister_netdevice_queue(bond->dev, &list);
4507         unregister_netdevice_many(&list);
4508         rtnl_unlock();
4509
4510         bond_destroy_proc_dir(bn);
4511 }
4512
4513 static struct pernet_operations bond_net_ops = {
4514         .init = bond_net_init,
4515         .exit = bond_net_exit,
4516         .id   = &bond_net_id,
4517         .size = sizeof(struct bond_net),
4518 };
4519
4520 static int __init bonding_init(void)
4521 {
4522         int i;
4523         int res;
4524
4525         pr_info("%s", bond_version);
4526
4527         res = bond_check_params(&bonding_defaults);
4528         if (res)
4529                 goto out;
4530
4531         res = register_pernet_subsys(&bond_net_ops);
4532         if (res)
4533                 goto out;
4534
4535         res = bond_netlink_init();
4536         if (res)
4537                 goto err_link;
4538
4539         bond_create_debugfs();
4540
4541         for (i = 0; i < max_bonds; i++) {
4542                 res = bond_create(&init_net, NULL);
4543                 if (res)
4544                         goto err;
4545         }
4546
4547         register_netdevice_notifier(&bond_netdev_notifier);
4548 out:
4549         return res;
4550 err:
4551         bond_destroy_debugfs();
4552         bond_netlink_fini();
4553 err_link:
4554         unregister_pernet_subsys(&bond_net_ops);
4555         goto out;
4556
4557 }
4558
4559 static void __exit bonding_exit(void)
4560 {
4561         unregister_netdevice_notifier(&bond_netdev_notifier);
4562
4563         bond_destroy_debugfs();
4564
4565         bond_netlink_fini();
4566         unregister_pernet_subsys(&bond_net_ops);
4567
4568 #ifdef CONFIG_NET_POLL_CONTROLLER
4569         /* Make sure we don't have an imbalance on our netpoll blocking */
4570         WARN_ON(atomic_read(&netpoll_block_tx));
4571 #endif
4572 }
4573
4574 module_init(bonding_init);
4575 module_exit(bonding_exit);
4576 MODULE_LICENSE("GPL");
4577 MODULE_VERSION(DRV_VERSION);
4578 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4579 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");