drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/fcntl.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/ioport.h>
  41 #include <linux/in.h>
  42 #include <net/ip.h>
  43 #include <linux/ip.h>
  44 #include <linux/tcp.h>
  45 #include <linux/udp.h>
  46 #include <linux/slab.h>
  47 #include <linux/string.h>
  48 #include <linux/init.h>
  49 #include <linux/timer.h>
  50 #include <linux/socket.h>
  51 #include <linux/ctype.h>
  52 #include <linux/inet.h>
  53 #include <linux/bitops.h>
  54 #include <linux/io.h>
  55 #include <asm/dma.h>
  56 #include <linux/uaccess.h>
  57 #include <linux/errno.h>
  58 #include <linux/netdevice.h>
  59 #include <linux/inetdevice.h>
  60 #include <linux/igmp.h>
  61 #include <linux/etherdevice.h>
  62 #include <linux/skbuff.h>
  63 #include <net/sock.h>
  64 #include <linux/rtnetlink.h>
  65 #include <linux/smp.h>
  66 #include <linux/if_ether.h>
  67 #include <net/arp.h>
  68 #include <linux/mii.h>
  69 #include <linux/ethtool.h>
  70 #include <linux/if_vlan.h>
  71 #include <linux/if_bonding.h>
  72 #include <linux/jiffies.h>
  73 #include <linux/preempt.h>
  74 #include <net/route.h>
  75 #include <net/net_namespace.h>
  76 #include <net/netns/generic.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/rculist.h>
  79 #include <net/flow_dissector.h>
  80 #include <net/switchdev.h>
  81 #include <net/bonding.h>
  82 #include <net/bond_3ad.h>
  83 #include <net/bond_alb.h>
  84
  85 #include "bonding_priv.h"
  86
  87 /*---------------------------- Module parameters ----------------------------*/
  88
  89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  90
  91 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  92 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  93 static int num_peer_notif = 1;
  94 static int miimon;
  95 static int updelay;
  96 static int downdelay;
  97 static int use_carrier  = 1;
  98 static char *mode;
  99 static char *primary;
 100 static char *primary_reselect;
 101 static char *lacp_rate;
 102 static int min_links;
 103 static char *ad_select;
 104 static char *xmit_hash_policy;
 105 static int arp_interval;
 106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 107 static char *arp_validate;
 108 static char *arp_all_targets;
 109 static char *fail_over_mac;
 110 static int all_slaves_active;
 111 static struct bond_params bonding_defaults;
 112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 113 static int packets_per_slave = 1;
 114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 115
 116 module_param(max_bonds, int, 0);
 117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 118 module_param(tx_queues, int, 0);
 119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 120 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 122                                "failover event (alias of num_unsol_na)");
 123 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 125                                "failover event (alias of num_grat_arp)");
 126 module_param(miimon, int, 0);
 127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 128 module_param(updelay, int, 0);
 129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 130 module_param(downdelay, int, 0);
 131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 132                             "in milliseconds");
 133 module_param(use_carrier, int, 0);
 134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 135                               "0 for off, 1 for on (default)");
 136 module_param(mode, charp, 0);
 137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 138                        "1 for active-backup, 2 for balance-xor, "
 139                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 140                        "6 for balance-alb");
 141 module_param(primary, charp, 0);
 142 MODULE_PARM_DESC(primary, "Primary network device to use");
 143 module_param(primary_reselect, charp, 0);
 144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 145                                    "once it comes up; "
 146                                    "0 for always (default), "
 147                                    "1 for only if speed of primary is "
 148                                    "better, "
 149                                    "2 for only on active slave "
 150                                    "failure");
 151 module_param(lacp_rate, charp, 0);
 152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 153                             "0 for slow, 1 for fast");
 154 module_param(ad_select, charp, 0);
 155 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 156                             "0 for stable (default), 1 for bandwidth, "
 157                             "2 for count");
 158 module_param(min_links, int, 0);
 159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 160
 161 module_param(xmit_hash_policy, charp, 0);
 162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 163                                    "0 for layer 2 (default), 1 for layer 3+4, "
 164                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 165                                    "4 for encap layer 3+4");
 166 module_param(arp_interval, int, 0);
 167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 168 module_param_array(arp_ip_target, charp, NULL, 0);
 169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 170 module_param(arp_validate, charp, 0);
 171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 172                                "0 for none (default), 1 for active, "
 173                                "2 for backup, 3 for all");
 174 module_param(arp_all_targets, charp, 0);
 175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 176 module_param(fail_over_mac, charp, 0);
 177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 178                                 "the same MAC; 0 for none (default), "
 179                                 "1 for active, 2 for follow");
 180 module_param(all_slaves_active, int, 0);
 181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 182                                      "by setting active flag for all slaves; "
 183                                      "0 for never (default), 1 for always.");
 184 module_param(resend_igmp, int, 0);
 185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 186                               "link failure");
 187 module_param(packets_per_slave, int, 0);
 188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 189                                     "mode; 0 for a random slave, 1 packet per "
 190                                     "slave (default), >1 packets per slave.");
 191 module_param(lp_interval, uint, 0);
 192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 193                               "the bonding driver sends learning packets to "
 194                               "each slaves peer switch. The default is 1.");
 195
 196 /*----------------------------- Global variables ----------------------------*/
 197
 198 #ifdef CONFIG_NET_POLL_CONTROLLER
 199 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 200 #endif
 201
 202 unsigned int bond_net_id __read_mostly;
 203
 204 /*-------------------------- Forward declarations ---------------------------*/
 205
 206 static int bond_init(struct net_device *bond_dev);
 207 static void bond_uninit(struct net_device *bond_dev);
 208 static void bond_get_stats(struct net_device *bond_dev,
 209                            struct rtnl_link_stats64 *stats);
 210 static void bond_slave_arr_handler(struct work_struct *work);
 211 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 212                                   int mod);
 213
 214 /*---------------------------- General routines -----------------------------*/
 215
 216 const char *bond_mode_name(int mode)
 217 {
 218         static const char *names[] = {
 219                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 220                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 221                 [BOND_MODE_XOR] = "load balancing (xor)",
 222                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 223                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 224                 [BOND_MODE_TLB] = "transmit load balancing",
 225                 [BOND_MODE_ALB] = "adaptive load balancing",
 226         };
 227
 228         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 229                 return "unknown";
 230
 231         return names[mode];
 232 }
 233
 234 /*---------------------------------- VLAN -----------------------------------*/
 235
 236 /**
 237  * bond_dev_queue_xmit - Prepare skb for xmit.
 238  *
 239  * @bond: bond device that got this skb for tx.
 240  * @skb: hw accel VLAN tagged skb to transmit
 241  * @slave_dev: slave that is supposed to xmit this skbuff
 242  */
 243 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 244                         struct net_device *slave_dev)
 245 {
 246         skb->dev = slave_dev;
 247
 248         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 249                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 250         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 251
 252         if (unlikely(netpoll_tx_running(bond->dev)))
 253                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 254         else
 255                 dev_queue_xmit(skb);
 256 }
 257
 258 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 259  * We don't protect the slave list iteration with a lock because:
 260  * a. This operation is performed in IOCTL context,
 261  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 262  * c. Holding a lock with BH disabled while directly calling a base driver
 263  *    entry point is generally a BAD idea.
 264  *
 265  * The design of synchronization/protection for this operation in the 8021q
 266  * module is good for one or more VLAN devices over a single physical device
 267  * and cannot be extended for a teaming solution like bonding, so there is a
 268  * potential race condition here where a net device from the vlan group might
 269  * be referenced (either by a base driver or the 8021q code) while it is being
 270  * removed from the system. However, it turns out we're not making matters
 271  * worse, and if it works for regular VLAN usage it will work here too.
 272 */
 273
 274 /**
 275  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 276  * @bond_dev: bonding net device that got called
 277  * @vid: vlan id being added
 278  */
 279 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 280                                 __be16 proto, u16 vid)
 281 {
 282         struct bonding *bond = netdev_priv(bond_dev);
 283         struct slave *slave, *rollback_slave;
 284         struct list_head *iter;
 285         int res;
 286
 287         bond_for_each_slave(bond, slave, iter) {
 288                 res = vlan_vid_add(slave->dev, proto, vid);
 289                 if (res)
 290                         goto unwind;
 291         }
 292
 293         return 0;
 294
 295 unwind:
 296         /* unwind to the slave that failed */
 297         bond_for_each_slave(bond, rollback_slave, iter) {
 298                 if (rollback_slave == slave)
 299                         break;
 300
 301                 vlan_vid_del(rollback_slave->dev, proto, vid);
 302         }
 303
 304         return res;
 305 }
 306
 307 /**
 308  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 309  * @bond_dev: bonding net device that got called
 310  * @vid: vlan id being removed
 311  */
 312 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 313                                  __be16 proto, u16 vid)
 314 {
 315         struct bonding *bond = netdev_priv(bond_dev);
 316         struct list_head *iter;
 317         struct slave *slave;
 318
 319         bond_for_each_slave(bond, slave, iter)
 320                 vlan_vid_del(slave->dev, proto, vid);
 321
 322         if (bond_is_lb(bond))
 323                 bond_alb_clear_vlan(bond, vid);
 324
 325         return 0;
 326 }
 327
 328 /*------------------------------- Link status -------------------------------*/
 329
 330 /* Set the carrier state for the master according to the state of its
 331  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 332  * do special 802.3ad magic.
 333  *
 334  * Returns zero if carrier state does not change, nonzero if it does.
 335  */
 336 int bond_set_carrier(struct bonding *bond)
 337 {
 338         struct list_head *iter;
 339         struct slave *slave;
 340
 341         if (!bond_has_slaves(bond))
 342                 goto down;
 343
 344         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 345                 return bond_3ad_set_carrier(bond);
 346
 347         bond_for_each_slave(bond, slave, iter) {
 348                 if (slave->link == BOND_LINK_UP) {
 349                         if (!netif_carrier_ok(bond->dev)) {
 350                                 netif_carrier_on(bond->dev);
 351                                 return 1;
 352                         }
 353                         return 0;
 354                 }
 355         }
 356
 357 down:
 358         if (netif_carrier_ok(bond->dev)) {
 359                 netif_carrier_off(bond->dev);
 360                 return 1;
 361         }
 362         return 0;
 363 }
 364
 365 /* Get link speed and duplex from the slave's base driver
 366  * using ethtool. If for some reason the call fails or the
 367  * values are invalid, set speed and duplex to -1,
 368  * and return. Return 1 if speed or duplex settings are
 369  * UNKNOWN; 0 otherwise.
 370  */
 371 static int bond_update_speed_duplex(struct slave *slave)
 372 {
 373         struct net_device *slave_dev = slave->dev;
 374         struct ethtool_link_ksettings ecmd;
 375         int res;
 376
 377         slave->speed = SPEED_UNKNOWN;
 378         slave->duplex = DUPLEX_UNKNOWN;
 379
 380         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 381         if (res < 0)
 382                 return 1;
 383         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 384                 return 1;
 385         switch (ecmd.base.duplex) {
 386         case DUPLEX_FULL:
 387         case DUPLEX_HALF:
 388                 break;
 389         default:
 390                 return 1;
 391         }
 392
 393         slave->speed = ecmd.base.speed;
 394         slave->duplex = ecmd.base.duplex;
 395
 396         return 0;
 397 }
 398
 399 const char *bond_slave_link_status(s8 link)
 400 {
 401         switch (link) {
 402         case BOND_LINK_UP:
 403                 return "up";
 404         case BOND_LINK_FAIL:
 405                 return "going down";
 406         case BOND_LINK_DOWN:
 407                 return "down";
 408         case BOND_LINK_BACK:
 409                 return "going back";
 410         default:
 411                 return "unknown";
 412         }
 413 }
 414
 415 /* if <dev> supports MII link status reporting, check its link status.
 416  *
 417  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 418  * depending upon the setting of the use_carrier parameter.
 419  *
 420  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 421  * can't tell and just pretend it is), or 0, meaning that the link is
 422  * down.
 423  *
 424  * If reporting is non-zero, instead of faking link up, return -1 if
 425  * both ETHTOOL and MII ioctls fail (meaning the device does not
 426  * support them).  If use_carrier is set, return whatever it says.
 427  * It'd be nice if there was a good way to tell if a driver supports
 428  * netif_carrier, but there really isn't.
 429  */
 430 static int bond_check_dev_link(struct bonding *bond,
 431                                struct net_device *slave_dev, int reporting)
 432 {
 433         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 434         int (*ioctl)(struct net_device *, struct ifreq *, int);
 435         struct ifreq ifr;
 436         struct mii_ioctl_data *mii;
 437
 438         if (!reporting && !netif_running(slave_dev))
 439                 return 0;
 440
 441         if (bond->params.use_carrier)
 442                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 443
 444         /* Try to get link status using Ethtool first. */
 445         if (slave_dev->ethtool_ops->get_link)
 446                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 447                         BMSR_LSTATUS : 0;
 448
 449         /* Ethtool can't be used, fallback to MII ioctls. */
 450         ioctl = slave_ops->ndo_do_ioctl;
 451         if (ioctl) {
 452                 /* TODO: set pointer to correct ioctl on a per team member
 453                  *       bases to make this more efficient. that is, once
 454                  *       we determine the correct ioctl, we will always
 455                  *       call it and not the others for that team
 456                  *       member.
 457                  */
 458
 459                 /* We cannot assume that SIOCGMIIPHY will also read a
 460                  * register; not all network drivers (e.g., e100)
 461                  * support that.
 462                  */
 463
 464                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 465                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 466                 mii = if_mii(&ifr);
 467                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 468                         mii->reg_num = MII_BMSR;
 469                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 470                                 return mii->val_out & BMSR_LSTATUS;
 471                 }
 472         }
 473
 474         /* If reporting, report that either there's no dev->do_ioctl,
 475          * or both SIOCGMIIREG and get_link failed (meaning that we
 476          * cannot report link status).  If not reporting, pretend
 477          * we're ok.
 478          */
 479         return reporting ? -1 : BMSR_LSTATUS;
 480 }
 481
 482 /*----------------------------- Multicast list ------------------------------*/
 483
 484 /* Push the promiscuity flag down to appropriate slaves */
 485 static int bond_set_promiscuity(struct bonding *bond, int inc)
 486 {
 487         struct list_head *iter;
 488         int err = 0;
 489
 490         if (bond_uses_primary(bond)) {
 491                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 492
 493                 if (curr_active)
 494                         err = dev_set_promiscuity(curr_active->dev, inc);
 495         } else {
 496                 struct slave *slave;
 497
 498                 bond_for_each_slave(bond, slave, iter) {
 499                         err = dev_set_promiscuity(slave->dev, inc);
 500                         if (err)
 501                                 return err;
 502                 }
 503         }
 504         return err;
 505 }
 506
 507 /* Push the allmulti flag down to all slaves */
 508 static int bond_set_allmulti(struct bonding *bond, int inc)
 509 {
 510         struct list_head *iter;
 511         int err = 0;
 512
 513         if (bond_uses_primary(bond)) {
 514                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 515
 516                 if (curr_active)
 517                         err = dev_set_allmulti(curr_active->dev, inc);
 518         } else {
 519                 struct slave *slave;
 520
 521                 bond_for_each_slave(bond, slave, iter) {
 522                         err = dev_set_allmulti(slave->dev, inc);
 523                         if (err)
 524                                 return err;
 525                 }
 526         }
 527         return err;
 528 }
 529
 530 /* Retrieve the list of registered multicast addresses for the bonding
 531  * device and retransmit an IGMP JOIN request to the current active
 532  * slave.
 533  */
 534 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 535 {
 536         struct bonding *bond = container_of(work, struct bonding,
 537                                             mcast_work.work);
 538
 539         if (!rtnl_trylock()) {
 540                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 541                 return;
 542         }
 543         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 544
 545         if (bond->igmp_retrans > 1) {
 546                 bond->igmp_retrans--;
 547                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 548         }
 549         rtnl_unlock();
 550 }
 551
 552 /* Flush bond's hardware addresses from slave */
 553 static void bond_hw_addr_flush(struct net_device *bond_dev,
 554                                struct net_device *slave_dev)
 555 {
 556         struct bonding *bond = netdev_priv(bond_dev);
 557
 558         dev_uc_unsync(slave_dev, bond_dev);
 559         dev_mc_unsync(slave_dev, bond_dev);
 560
 561         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 562                 /* del lacpdu mc addr from mc list */
 563                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 564
 565                 dev_mc_del(slave_dev, lacpdu_multicast);
 566         }
 567 }
 568
 569 /*--------------------------- Active slave change ---------------------------*/
 570
 571 /* Update the hardware address list and promisc/allmulti for the new and
 572  * old active slaves (if any).  Modes that are not using primary keep all
 573  * slaves up date at all times; only the modes that use primary need to call
 574  * this function to swap these settings during a failover.
 575  */
 576 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 577                               struct slave *old_active)
 578 {
 579         if (old_active) {
 580                 if (bond->dev->flags & IFF_PROMISC)
 581                         dev_set_promiscuity(old_active->dev, -1);
 582
 583                 if (bond->dev->flags & IFF_ALLMULTI)
 584                         dev_set_allmulti(old_active->dev, -1);
 585
 586                 bond_hw_addr_flush(bond->dev, old_active->dev);
 587         }
 588
 589         if (new_active) {
 590                 /* FIXME: Signal errors upstream. */
 591                 if (bond->dev->flags & IFF_PROMISC)
 592                         dev_set_promiscuity(new_active->dev, 1);
 593
 594                 if (bond->dev->flags & IFF_ALLMULTI)
 595                         dev_set_allmulti(new_active->dev, 1);
 596
 597                 netif_addr_lock_bh(bond->dev);
 598                 dev_uc_sync(new_active->dev, bond->dev);
 599                 dev_mc_sync(new_active->dev, bond->dev);
 600                 netif_addr_unlock_bh(bond->dev);
 601         }
 602 }
 603
 604 /**
 605  * bond_set_dev_addr - clone slave's address to bond
 606  * @bond_dev: bond net device
 607  * @slave_dev: slave net device
 608  *
 609  * Should be called with RTNL held.
 610  */
 611 static void bond_set_dev_addr(struct net_device *bond_dev,
 612                               struct net_device *slave_dev)
 613 {
 614         netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n",
 615                    bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len);
 616         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 617         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 618         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 619 }
 620
 621 static struct slave *bond_get_old_active(struct bonding *bond,
 622                                          struct slave *new_active)
 623 {
 624         struct slave *slave;
 625         struct list_head *iter;
 626
 627         bond_for_each_slave(bond, slave, iter) {
 628                 if (slave == new_active)
 629                         continue;
 630
 631                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 632                         return slave;
 633         }
 634
 635         return NULL;
 636 }
 637
 638 /* bond_do_fail_over_mac
 639  *
 640  * Perform special MAC address swapping for fail_over_mac settings
 641  *
 642  * Called with RTNL
 643  */
 644 static void bond_do_fail_over_mac(struct bonding *bond,
 645                                   struct slave *new_active,
 646                                   struct slave *old_active)
 647 {
 648         u8 tmp_mac[MAX_ADDR_LEN];
 649         struct sockaddr_storage ss;
 650         int rv;
 651
 652         switch (bond->params.fail_over_mac) {
 653         case BOND_FOM_ACTIVE:
 654                 if (new_active)
 655                         bond_set_dev_addr(bond->dev, new_active->dev);
 656                 break;
 657         case BOND_FOM_FOLLOW:
 658                 /* if new_active && old_active, swap them
 659                  * if just old_active, do nothing (going to no active slave)
 660                  * if just new_active, set new_active to bond's MAC
 661                  */
 662                 if (!new_active)
 663                         return;
 664
 665                 if (!old_active)
 666                         old_active = bond_get_old_active(bond, new_active);
 667
 668                 if (old_active) {
 669                         bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 670                                           new_active->dev->addr_len);
 671                         bond_hw_addr_copy(ss.__data,
 672                                           old_active->dev->dev_addr,
 673                                           old_active->dev->addr_len);
 674                         ss.ss_family = new_active->dev->type;
 675                 } else {
 676                         bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 677                                           bond->dev->addr_len);
 678                         ss.ss_family = bond->dev->type;
 679                 }
 680
 681                 rv = dev_set_mac_address(new_active->dev,
 682                                          (struct sockaddr *)&ss);
 683                 if (rv) {
 684                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 685                                    -rv, new_active->dev->name);
 686                         goto out;
 687                 }
 688
 689                 if (!old_active)
 690                         goto out;
 691
 692                 bond_hw_addr_copy(ss.__data, tmp_mac,
 693                                   new_active->dev->addr_len);
 694                 ss.ss_family = old_active->dev->type;
 695
 696                 rv = dev_set_mac_address(old_active->dev,
 697                                          (struct sockaddr *)&ss);
 698                 if (rv)
 699                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 700                                    -rv, new_active->dev->name);
 701 out:
 702                 break;
 703         default:
 704                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 705                            bond->params.fail_over_mac);
 706                 break;
 707         }
 708
 709 }
 710
 711 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
 712 {
 713         struct slave *prim = rtnl_dereference(bond->primary_slave);
 714         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 715
 716         if (!prim || prim->link != BOND_LINK_UP) {
 717                 if (!curr || curr->link != BOND_LINK_UP)
 718                         return NULL;
 719                 return curr;
 720         }
 721
 722         if (bond->force_primary) {
 723                 bond->force_primary = false;
 724                 return prim;
 725         }
 726
 727         if (!curr || curr->link != BOND_LINK_UP)
 728                 return prim;
 729
 730         /* At this point, prim and curr are both up */
 731         switch (bond->params.primary_reselect) {
 732         case BOND_PRI_RESELECT_ALWAYS:
 733                 return prim;
 734         case BOND_PRI_RESELECT_BETTER:
 735                 if (prim->speed < curr->speed)
 736                         return curr;
 737                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
 738                         return curr;
 739                 return prim;
 740         case BOND_PRI_RESELECT_FAILURE:
 741                 return curr;
 742         default:
 743                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
 744                            bond->params.primary_reselect);
 745                 return curr;
 746         }
 747 }
 748
 749 /**
 750  * bond_find_best_slave - select the best available slave to be the active one
 751  * @bond: our bonding struct
 752  */
 753 static struct slave *bond_find_best_slave(struct bonding *bond)
 754 {
 755         struct slave *slave, *bestslave = NULL;
 756         struct list_head *iter;
 757         int mintime = bond->params.updelay;
 758
 759         slave = bond_choose_primary_or_current(bond);
 760         if (slave)
 761                 return slave;
 762
 763         bond_for_each_slave(bond, slave, iter) {
 764                 if (slave->link == BOND_LINK_UP)
 765                         return slave;
 766                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 767                     slave->delay < mintime) {
 768                         mintime = slave->delay;
 769                         bestslave = slave;
 770                 }
 771         }
 772
 773         return bestslave;
 774 }
 775
 776 static bool bond_should_notify_peers(struct bonding *bond)
 777 {
 778         struct slave *slave;
 779
 780         rcu_read_lock();
 781         slave = rcu_dereference(bond->curr_active_slave);
 782         rcu_read_unlock();
 783
 784         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 785                    slave ? slave->dev->name : "NULL");
 786
 787         if (!slave || !bond->send_peer_notif ||
 788             !netif_carrier_ok(bond->dev) ||
 789             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 790                 return false;
 791
 792         return true;
 793 }
 794
 795 /**
 796  * change_active_interface - change the active slave into the specified one
 797  * @bond: our bonding struct
 798  * @new: the new slave to make the active one
 799  *
 800  * Set the new slave to the bond's settings and unset them on the old
 801  * curr_active_slave.
 802  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 803  *
 804  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 805  * because it is apparently the best available slave we have, even though its
 806  * updelay hasn't timed out yet.
 807  *
 808  * Caller must hold RTNL.
 809  */
 810 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 811 {
 812         struct slave *old_active;
 813
 814         ASSERT_RTNL();
 815
 816         old_active = rtnl_dereference(bond->curr_active_slave);
 817
 818         if (old_active == new_active)
 819                 return;
 820
 821         if (new_active) {
 822                 new_active->last_link_up = jiffies;
 823
 824                 if (new_active->link == BOND_LINK_BACK) {
 825                         if (bond_uses_primary(bond)) {
 826                                 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
 827                                             new_active->dev->name,
 828                                             (bond->params.updelay - new_active->delay) * bond->params.miimon);
 829                         }
 830
 831                         new_active->delay = 0;
 832                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
 833                                                   BOND_SLAVE_NOTIFY_NOW);
 834
 835                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 836                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 837
 838                         if (bond_is_lb(bond))
 839                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 840                 } else {
 841                         if (bond_uses_primary(bond)) {
 842                                 netdev_info(bond->dev, "making interface %s the new active one\n",
 843                                             new_active->dev->name);
 844                         }
 845                 }
 846         }
 847
 848         if (bond_uses_primary(bond))
 849                 bond_hw_addr_swap(bond, new_active, old_active);
 850
 851         if (bond_is_lb(bond)) {
 852                 bond_alb_handle_active_change(bond, new_active);
 853                 if (old_active)
 854                         bond_set_slave_inactive_flags(old_active,
 855                                                       BOND_SLAVE_NOTIFY_NOW);
 856                 if (new_active)
 857                         bond_set_slave_active_flags(new_active,
 858                                                     BOND_SLAVE_NOTIFY_NOW);
 859         } else {
 860                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 861         }
 862
 863         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
 864                 if (old_active)
 865                         bond_set_slave_inactive_flags(old_active,
 866                                                       BOND_SLAVE_NOTIFY_NOW);
 867
 868                 if (new_active) {
 869                         bool should_notify_peers = false;
 870
 871                         bond_set_slave_active_flags(new_active,
 872                                                     BOND_SLAVE_NOTIFY_NOW);
 873
 874                         if (bond->params.fail_over_mac)
 875                                 bond_do_fail_over_mac(bond, new_active,
 876                                                       old_active);
 877
 878                         if (netif_running(bond->dev)) {
 879                                 bond->send_peer_notif =
 880                                         bond->params.num_peer_notif;
 881                                 should_notify_peers =
 882                                         bond_should_notify_peers(bond);
 883                         }
 884
 885                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 886                         if (should_notify_peers)
 887                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 888                                                          bond->dev);
 889                 }
 890         }
 891
 892         /* resend IGMP joins since active slave has changed or
 893          * all were sent on curr_active_slave.
 894          * resend only if bond is brought up with the affected
 895          * bonding modes and the retransmission is enabled
 896          */
 897         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 898             ((bond_uses_primary(bond) && new_active) ||
 899              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
 900                 bond->igmp_retrans = bond->params.resend_igmp;
 901                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 902         }
 903 }
 904
 905 /**
 906  * bond_select_active_slave - select a new active slave, if needed
 907  * @bond: our bonding struct
 908  *
 909  * This functions should be called when one of the following occurs:
 910  * - The old curr_active_slave has been released or lost its link.
 911  * - The primary_slave has got its link back.
 912  * - A slave has got its link back and there's no old curr_active_slave.
 913  *
 914  * Caller must hold RTNL.
 915  */
 916 void bond_select_active_slave(struct bonding *bond)
 917 {
 918         struct slave *best_slave;
 919         int rv;
 920
 921         ASSERT_RTNL();
 922
 923         best_slave = bond_find_best_slave(bond);
 924         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
 925                 bond_change_active_slave(bond, best_slave);
 926                 rv = bond_set_carrier(bond);
 927                 if (!rv)
 928                         return;
 929
 930                 if (netif_carrier_ok(bond->dev))
 931                         netdev_info(bond->dev, "first active interface up!\n");
 932                 else
 933                         netdev_info(bond->dev, "now running without any active interface!\n");
 934         }
 935 }
 936
 937 #ifdef CONFIG_NET_POLL_CONTROLLER
 938 static inline int slave_enable_netpoll(struct slave *slave)
 939 {
 940         struct netpoll *np;
 941         int err = 0;
 942
 943         np = kzalloc(sizeof(*np), GFP_KERNEL);
 944         err = -ENOMEM;
 945         if (!np)
 946                 goto out;
 947
 948         err = __netpoll_setup(np, slave->dev);
 949         if (err) {
 950                 kfree(np);
 951                 goto out;
 952         }
 953         slave->np = np;
 954 out:
 955         return err;
 956 }
 957 static inline void slave_disable_netpoll(struct slave *slave)
 958 {
 959         struct netpoll *np = slave->np;
 960
 961         if (!np)
 962                 return;
 963
 964         slave->np = NULL;
 965         __netpoll_free_async(np);
 966 }
 967
 968 static void bond_poll_controller(struct net_device *bond_dev)
 969 {
 970         struct bonding *bond = netdev_priv(bond_dev);
 971         struct slave *slave = NULL;
 972         struct list_head *iter;
 973         struct ad_info ad_info;
 974         struct netpoll_info *ni;
 975         const struct net_device_ops *ops;
 976
 977         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 978                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
 979                         return;
 980
 981         bond_for_each_slave_rcu(bond, slave, iter) {
 982                 ops = slave->dev->netdev_ops;
 983                 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
 984                         continue;
 985
 986                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 987                         struct aggregator *agg =
 988                             SLAVE_AD_INFO(slave)->port.aggregator;
 989
 990                         if (agg &&
 991                             agg->aggregator_identifier != ad_info.aggregator_id)
 992                                 continue;
 993                 }
 994
 995                 ni = rcu_dereference_bh(slave->dev->npinfo);
 996                 if (down_trylock(&ni->dev_lock))
 997                         continue;
 998                 ops->ndo_poll_controller(slave->dev);
 999                 up(&ni->dev_lock);
1000         }
1001 }
1002
1003 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1004 {
1005         struct bonding *bond = netdev_priv(bond_dev);
1006         struct list_head *iter;
1007         struct slave *slave;
1008
1009         bond_for_each_slave(bond, slave, iter)
1010                 if (bond_slave_is_up(slave))
1011                         slave_disable_netpoll(slave);
1012 }
1013
1014 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1015 {
1016         struct bonding *bond = netdev_priv(dev);
1017         struct list_head *iter;
1018         struct slave *slave;
1019         int err = 0;
1020
1021         bond_for_each_slave(bond, slave, iter) {
1022                 err = slave_enable_netpoll(slave);
1023                 if (err) {
1024                         bond_netpoll_cleanup(dev);
1025                         break;
1026                 }
1027         }
1028         return err;
1029 }
1030 #else
1031 static inline int slave_enable_netpoll(struct slave *slave)
1032 {
1033         return 0;
1034 }
1035 static inline void slave_disable_netpoll(struct slave *slave)
1036 {
1037 }
1038 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1039 {
1040 }
1041 #endif
1042
1043 /*---------------------------------- IOCTL ----------------------------------*/
1044
1045 static netdev_features_t bond_fix_features(struct net_device *dev,
1046                                            netdev_features_t features)
1047 {
1048         struct bonding *bond = netdev_priv(dev);
1049         struct list_head *iter;
1050         netdev_features_t mask;
1051         struct slave *slave;
1052
1053         mask = features;
1054
1055         features &= ~NETIF_F_ONE_FOR_ALL;
1056         features |= NETIF_F_ALL_FOR_ALL;
1057
1058         bond_for_each_slave(bond, slave, iter) {
1059                 features = netdev_increment_features(features,
1060                                                      slave->dev->features,
1061                                                      mask);
1062         }
1063         features = netdev_add_tso_features(features, mask);
1064
1065         return features;
1066 }
1067
1068 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1069                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1070                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1071
1072 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1073                                  NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1074
1075 static void bond_compute_features(struct bonding *bond)
1076 {
1077         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1078                                         IFF_XMIT_DST_RELEASE_PERM;
1079         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1080         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1081         struct net_device *bond_dev = bond->dev;
1082         struct list_head *iter;
1083         struct slave *slave;
1084         unsigned short max_hard_header_len = ETH_HLEN;
1085         unsigned int gso_max_size = GSO_MAX_SIZE;
1086         u16 gso_max_segs = GSO_MAX_SEGS;
1087
1088         if (!bond_has_slaves(bond))
1089                 goto done;
1090         vlan_features &= NETIF_F_ALL_FOR_ALL;
1091
1092         bond_for_each_slave(bond, slave, iter) {
1093                 vlan_features = netdev_increment_features(vlan_features,
1094                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1095
1096                 enc_features = netdev_increment_features(enc_features,
1097                                                          slave->dev->hw_enc_features,
1098                                                          BOND_ENC_FEATURES);
1099                 dst_release_flag &= slave->dev->priv_flags;
1100                 if (slave->dev->hard_header_len > max_hard_header_len)
1101                         max_hard_header_len = slave->dev->hard_header_len;
1102
1103                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1104                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1105         }
1106         bond_dev->hard_header_len = max_hard_header_len;
1107
1108 done:
1109         bond_dev->vlan_features = vlan_features;
1110         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1111         bond_dev->gso_max_segs = gso_max_segs;
1112         netif_set_gso_max_size(bond_dev, gso_max_size);
1113
1114         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1115         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1116             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1117                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1118
1119         netdev_change_features(bond_dev);
1120 }
1121
1122 static void bond_setup_by_slave(struct net_device *bond_dev,
1123                                 struct net_device *slave_dev)
1124 {
1125         bond_dev->header_ops        = slave_dev->header_ops;
1126
1127         bond_dev->type              = slave_dev->type;
1128         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1129         bond_dev->addr_len          = slave_dev->addr_len;
1130
1131         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1132                 slave_dev->addr_len);
1133 }
1134
1135 /* On bonding slaves other than the currently active slave, suppress
1136  * duplicates except for alb non-mcast/bcast.
1137  */
1138 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1139                                             struct slave *slave,
1140                                             struct bonding *bond)
1141 {
1142         if (bond_is_slave_inactive(slave)) {
1143                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1144                     skb->pkt_type != PACKET_BROADCAST &&
1145                     skb->pkt_type != PACKET_MULTICAST)
1146                         return false;
1147                 return true;
1148         }
1149         return false;
1150 }
1151
1152 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1153 {
1154         struct sk_buff *skb = *pskb;
1155         struct slave *slave;
1156         struct bonding *bond;
1157         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1158                           struct slave *);
1159         int ret = RX_HANDLER_ANOTHER;
1160
1161         skb = skb_share_check(skb, GFP_ATOMIC);
1162         if (unlikely(!skb))
1163                 return RX_HANDLER_CONSUMED;
1164
1165         *pskb = skb;
1166
1167         slave = bond_slave_get_rcu(skb->dev);
1168         bond = slave->bond;
1169
1170         recv_probe = READ_ONCE(bond->recv_probe);
1171         if (recv_probe) {
1172                 ret = recv_probe(skb, bond, slave);
1173                 if (ret == RX_HANDLER_CONSUMED) {
1174                         consume_skb(skb);
1175                         return ret;
1176                 }
1177         }
1178
1179         /* don't change skb->dev for link-local packets */
1180         if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1181                 return RX_HANDLER_PASS;
1182         if (bond_should_deliver_exact_match(skb, slave, bond))
1183                 return RX_HANDLER_EXACT;
1184
1185         skb->dev = bond->dev;
1186
1187         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1188             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1189             skb->pkt_type == PACKET_HOST) {
1190
1191                 if (unlikely(skb_cow_head(skb,
1192                                           skb->data - skb_mac_header(skb)))) {
1193                         kfree_skb(skb);
1194                         return RX_HANDLER_CONSUMED;
1195                 }
1196                 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1197                                   bond->dev->addr_len);
1198         }
1199
1200         return ret;
1201 }
1202
1203 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1204 {
1205         switch (BOND_MODE(bond)) {
1206         case BOND_MODE_ROUNDROBIN:
1207                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1208         case BOND_MODE_ACTIVEBACKUP:
1209                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1210         case BOND_MODE_BROADCAST:
1211                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1212         case BOND_MODE_XOR:
1213         case BOND_MODE_8023AD:
1214                 return NETDEV_LAG_TX_TYPE_HASH;
1215         default:
1216                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1217         }
1218 }
1219
1220 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave)
1221 {
1222         struct netdev_lag_upper_info lag_upper_info;
1223         int err;
1224
1225         lag_upper_info.tx_type = bond_lag_tx_type(bond);
1226         err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1227                                            &lag_upper_info);
1228         if (err)
1229                 return err;
1230         rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1231         return 0;
1232 }
1233
1234 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1235 {
1236         netdev_upper_dev_unlink(slave->dev, bond->dev);
1237         slave->dev->flags &= ~IFF_SLAVE;
1238         rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1239 }
1240
1241 static struct slave *bond_alloc_slave(struct bonding *bond)
1242 {
1243         struct slave *slave = NULL;
1244
1245         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1246         if (!slave)
1247                 return NULL;
1248
1249         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1250                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1251                                                GFP_KERNEL);
1252                 if (!SLAVE_AD_INFO(slave)) {
1253                         kfree(slave);
1254                         return NULL;
1255                 }
1256         }
1257         return slave;
1258 }
1259
1260 static void bond_free_slave(struct slave *slave)
1261 {
1262         struct bonding *bond = bond_get_bond_by_slave(slave);
1263
1264         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1265                 kfree(SLAVE_AD_INFO(slave));
1266
1267         kfree(slave);
1268 }
1269
1270 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1271 {
1272         info->bond_mode = BOND_MODE(bond);
1273         info->miimon = bond->params.miimon;
1274         info->num_slaves = bond->slave_cnt;
1275 }
1276
1277 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1278 {
1279         strcpy(info->slave_name, slave->dev->name);
1280         info->link = slave->link;
1281         info->state = bond_slave_state(slave);
1282         info->link_failure_count = slave->link_failure_count;
1283 }
1284
1285 static void bond_netdev_notify(struct net_device *dev,
1286                                struct netdev_bonding_info *info)
1287 {
1288         rtnl_lock();
1289         netdev_bonding_info_change(dev, info);
1290         rtnl_unlock();
1291 }
1292
1293 static void bond_netdev_notify_work(struct work_struct *_work)
1294 {
1295         struct netdev_notify_work *w =
1296                 container_of(_work, struct netdev_notify_work, work.work);
1297
1298         bond_netdev_notify(w->dev, &w->bonding_info);
1299         dev_put(w->dev);
1300         kfree(w);
1301 }
1302
1303 void bond_queue_slave_event(struct slave *slave)
1304 {
1305         struct bonding *bond = slave->bond;
1306         struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1307
1308         if (!nnw)
1309                 return;
1310
1311         dev_hold(slave->dev);
1312         nnw->dev = slave->dev;
1313         bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1314         bond_fill_ifbond(bond, &nnw->bonding_info.master);
1315         INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1316
1317         queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1318 }
1319
1320 void bond_lower_state_changed(struct slave *slave)
1321 {
1322         struct netdev_lag_lower_state_info info;
1323
1324         info.link_up = slave->link == BOND_LINK_UP ||
1325                        slave->link == BOND_LINK_FAIL;
1326         info.tx_enabled = bond_is_active_slave(slave);
1327         netdev_lower_state_changed(slave->dev, &info);
1328 }
1329
1330 /* enslave device <slave> to bond device <master> */
1331 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1332 {
1333         struct bonding *bond = netdev_priv(bond_dev);
1334         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1335         struct slave *new_slave = NULL, *prev_slave;
1336         struct sockaddr_storage ss;
1337         int link_reporting;
1338         int res = 0, i;
1339
1340         if (!bond->params.use_carrier &&
1341             slave_dev->ethtool_ops->get_link == NULL &&
1342             slave_ops->ndo_do_ioctl == NULL) {
1343                 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1344                             slave_dev->name);
1345         }
1346
1347         /* already in-use? */
1348         if (netdev_is_rx_handler_busy(slave_dev)) {
1349                 netdev_err(bond_dev,
1350                            "Error: Device is in use and cannot be enslaved\n");
1351                 return -EBUSY;
1352         }
1353
1354         if (bond_dev == slave_dev) {
1355                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1356                 return -EPERM;
1357         }
1358
1359         /* vlan challenged mutual exclusion */
1360         /* no need to lock since we're protected by rtnl_lock */
1361         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1362                 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1363                            slave_dev->name);
1364                 if (vlan_uses_dev(bond_dev)) {
1365                         netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1366                                    slave_dev->name, bond_dev->name);
1367                         return -EPERM;
1368                 } else {
1369                         netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1370                                     slave_dev->name, slave_dev->name,
1371                                     bond_dev->name);
1372                 }
1373         } else {
1374                 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1375                            slave_dev->name);
1376         }
1377
1378         /* Old ifenslave binaries are no longer supported.  These can
1379          * be identified with moderate accuracy by the state of the slave:
1380          * the current ifenslave will set the interface down prior to
1381          * enslaving it; the old ifenslave will not.
1382          */
1383         if (slave_dev->flags & IFF_UP) {
1384                 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1385                            slave_dev->name);
1386                 return -EPERM;
1387         }
1388
1389         /* set bonding device ether type by slave - bonding netdevices are
1390          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1391          * there is a need to override some of the type dependent attribs/funcs.
1392          *
1393          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1394          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1395          */
1396         if (!bond_has_slaves(bond)) {
1397                 if (bond_dev->type != slave_dev->type) {
1398                         netdev_dbg(bond_dev, "change device type from %d to %d\n",
1399                                    bond_dev->type, slave_dev->type);
1400
1401                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1402                                                        bond_dev);
1403                         res = notifier_to_errno(res);
1404                         if (res) {
1405                                 netdev_err(bond_dev, "refused to change device type\n");
1406                                 return -EBUSY;
1407                         }
1408
1409                         /* Flush unicast and multicast addresses */
1410                         dev_uc_flush(bond_dev);
1411                         dev_mc_flush(bond_dev);
1412
1413                         if (slave_dev->type != ARPHRD_ETHER)
1414                                 bond_setup_by_slave(bond_dev, slave_dev);
1415                         else {
1416                                 ether_setup(bond_dev);
1417                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1418                         }
1419
1420                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1421                                                  bond_dev);
1422                 }
1423         } else if (bond_dev->type != slave_dev->type) {
1424                 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1425                            slave_dev->name, slave_dev->type, bond_dev->type);
1426                 return -EINVAL;
1427         }
1428
1429         if (slave_dev->type == ARPHRD_INFINIBAND &&
1430             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1431                 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n",
1432                             slave_dev->type);
1433                 res = -EOPNOTSUPP;
1434                 goto err_undo_flags;
1435         }
1436
1437         if (!slave_ops->ndo_set_mac_address ||
1438             slave_dev->type == ARPHRD_INFINIBAND) {
1439                 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1440                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1441                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1442                         if (!bond_has_slaves(bond)) {
1443                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1444                                 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1445                         } else {
1446                                 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");
1447                                 res = -EOPNOTSUPP;
1448                                 goto err_undo_flags;
1449                         }
1450                 }
1451         }
1452
1453         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1454
1455         /* If this is the first slave, then we need to set the master's hardware
1456          * address to be the same as the slave's.
1457          */
1458         if (!bond_has_slaves(bond) &&
1459             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1460                 bond_set_dev_addr(bond->dev, slave_dev);
1461
1462         new_slave = bond_alloc_slave(bond);
1463         if (!new_slave) {
1464                 res = -ENOMEM;
1465                 goto err_undo_flags;
1466         }
1467
1468         new_slave->bond = bond;
1469         new_slave->dev = slave_dev;
1470         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1471          * is set via sysfs or module option if desired.
1472          */
1473         new_slave->queue_id = 0;
1474
1475         /* Save slave's original mtu and then set it to match the bond */
1476         new_slave->original_mtu = slave_dev->mtu;
1477         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1478         if (res) {
1479                 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1480                 goto err_free;
1481         }
1482
1483         /* Save slave's original ("permanent") mac address for modes
1484          * that need it, and for restoring it upon release, and then
1485          * set it to the master's address
1486          */
1487         bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1488                           slave_dev->addr_len);
1489
1490         if (!bond->params.fail_over_mac ||
1491             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1492                 /* Set slave to master's mac address.  The application already
1493                  * set the master's mac address to that of the first slave
1494                  */
1495                 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1496                 ss.ss_family = slave_dev->type;
1497                 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
1498                 if (res) {
1499                         netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1500                         goto err_restore_mtu;
1501                 }
1502         }
1503
1504         /* set slave flag before open to prevent IPv6 addrconf */
1505         slave_dev->flags |= IFF_SLAVE;
1506
1507         /* open the slave since the application closed it */
1508         res = dev_open(slave_dev);
1509         if (res) {
1510                 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1511                 goto err_restore_mac;
1512         }
1513
1514         slave_dev->priv_flags |= IFF_BONDING;
1515         /* initialize slave stats */
1516         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1517
1518         if (bond_is_lb(bond)) {
1519                 /* bond_alb_init_slave() must be called before all other stages since
1520                  * it might fail and we do not want to have to undo everything
1521                  */
1522                 res = bond_alb_init_slave(bond, new_slave);
1523                 if (res)
1524                         goto err_close;
1525         }
1526
1527         /* If the mode uses primary, then the following is handled by
1528          * bond_change_active_slave().
1529          */
1530         if (!bond_uses_primary(bond)) {
1531                 /* set promiscuity level to new slave */
1532                 if (bond_dev->flags & IFF_PROMISC) {
1533                         res = dev_set_promiscuity(slave_dev, 1);
1534                         if (res)
1535                                 goto err_close;
1536                 }
1537
1538                 /* set allmulti level to new slave */
1539                 if (bond_dev->flags & IFF_ALLMULTI) {
1540                         res = dev_set_allmulti(slave_dev, 1);
1541                         if (res)
1542                                 goto err_close;
1543                 }
1544
1545                 netif_addr_lock_bh(bond_dev);
1546
1547                 dev_mc_sync_multiple(slave_dev, bond_dev);
1548                 dev_uc_sync_multiple(slave_dev, bond_dev);
1549
1550                 netif_addr_unlock_bh(bond_dev);
1551         }
1552
1553         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1554                 /* add lacpdu mc addr to mc list */
1555                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1556
1557                 dev_mc_add(slave_dev, lacpdu_multicast);
1558         }
1559
1560         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1561         if (res) {
1562                 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1563                            slave_dev->name);
1564                 goto err_close;
1565         }
1566
1567         prev_slave = bond_last_slave(bond);
1568
1569         new_slave->delay = 0;
1570         new_slave->link_failure_count = 0;
1571
1572         if (bond_update_speed_duplex(new_slave) &&
1573             bond_needs_speed_duplex(bond))
1574                 new_slave->link = BOND_LINK_DOWN;
1575
1576         new_slave->last_rx = jiffies -
1577                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1578         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1579                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1580
1581         if (bond->params.miimon && !bond->params.use_carrier) {
1582                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1583
1584                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1585                         /* miimon is set but a bonded network driver
1586                          * does not support ETHTOOL/MII and
1587                          * arp_interval is not set.  Note: if
1588                          * use_carrier is enabled, we will never go
1589                          * here (because netif_carrier is always
1590                          * supported); thus, we don't need to change
1591                          * the messages for netif_carrier.
1592                          */
1593                         netdev_warn(bond_dev, "MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n",
1594                                     slave_dev->name);
1595                 } else if (link_reporting == -1) {
1596                         /* unable get link status using mii/ethtool */
1597                         netdev_warn(bond_dev, "can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n",
1598                                     slave_dev->name);
1599                 }
1600         }
1601
1602         /* check for initial state */
1603         new_slave->link = BOND_LINK_NOCHANGE;
1604         if (bond->params.miimon) {
1605                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1606                         if (bond->params.updelay) {
1607                                 bond_set_slave_link_state(new_slave,
1608                                                           BOND_LINK_BACK,
1609                                                           BOND_SLAVE_NOTIFY_NOW);
1610                                 new_slave->delay = bond->params.updelay;
1611                         } else {
1612                                 bond_set_slave_link_state(new_slave,
1613                                                           BOND_LINK_UP,
1614                                                           BOND_SLAVE_NOTIFY_NOW);
1615                         }
1616                 } else {
1617                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1618                                                   BOND_SLAVE_NOTIFY_NOW);
1619                 }
1620         } else if (bond->params.arp_interval) {
1621                 bond_set_slave_link_state(new_slave,
1622                                           (netif_carrier_ok(slave_dev) ?
1623                                           BOND_LINK_UP : BOND_LINK_DOWN),
1624                                           BOND_SLAVE_NOTIFY_NOW);
1625         } else {
1626                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1627                                           BOND_SLAVE_NOTIFY_NOW);
1628         }
1629
1630         if (new_slave->link != BOND_LINK_DOWN)
1631                 new_slave->last_link_up = jiffies;
1632         netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1633                    new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1634                    (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1635
1636         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1637                 /* if there is a primary slave, remember it */
1638                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1639                         rcu_assign_pointer(bond->primary_slave, new_slave);
1640                         bond->force_primary = true;
1641                 }
1642         }
1643
1644         switch (BOND_MODE(bond)) {
1645         case BOND_MODE_ACTIVEBACKUP:
1646                 bond_set_slave_inactive_flags(new_slave,
1647                                               BOND_SLAVE_NOTIFY_NOW);
1648                 break;
1649         case BOND_MODE_8023AD:
1650                 /* in 802.3ad mode, the internal mechanism
1651                  * will activate the slaves in the selected
1652                  * aggregator
1653                  */
1654                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1655                 /* if this is the first slave */
1656                 if (!prev_slave) {
1657                         SLAVE_AD_INFO(new_slave)->id = 1;
1658                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1659                          * can be called only after the mac address of the bond is set
1660                          */
1661                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1662                 } else {
1663                         SLAVE_AD_INFO(new_slave)->id =
1664                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1665                 }
1666
1667                 bond_3ad_bind_slave(new_slave);
1668                 break;
1669         case BOND_MODE_TLB:
1670         case BOND_MODE_ALB:
1671                 bond_set_active_slave(new_slave);
1672                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1673                 break;
1674         default:
1675                 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1676
1677                 /* always active in trunk mode */
1678                 bond_set_active_slave(new_slave);
1679
1680                 /* In trunking mode there is little meaning to curr_active_slave
1681                  * anyway (it holds no special properties of the bond device),
1682                  * so we can change it without calling change_active_interface()
1683                  */
1684                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1685                     new_slave->link == BOND_LINK_UP)
1686                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1687
1688                 break;
1689         } /* switch(bond_mode) */
1690
1691 #ifdef CONFIG_NET_POLL_CONTROLLER
1692         slave_dev->npinfo = bond->dev->npinfo;
1693         if (slave_dev->npinfo) {
1694                 if (slave_enable_netpoll(new_slave)) {
1695                         netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1696                         res = -EBUSY;
1697                         goto err_detach;
1698                 }
1699         }
1700 #endif
1701
1702         if (!(bond_dev->features & NETIF_F_LRO))
1703                 dev_disable_lro(slave_dev);
1704
1705         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1706                                          new_slave);
1707         if (res) {
1708                 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1709                 goto err_detach;
1710         }
1711
1712         res = bond_master_upper_dev_link(bond, new_slave);
1713         if (res) {
1714                 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1715                 goto err_unregister;
1716         }
1717
1718         res = bond_sysfs_slave_add(new_slave);
1719         if (res) {
1720                 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1721                 goto err_upper_unlink;
1722         }
1723
1724         bond->slave_cnt++;
1725         bond_compute_features(bond);
1726         bond_set_carrier(bond);
1727
1728         if (bond_uses_primary(bond)) {
1729                 block_netpoll_tx();
1730                 bond_select_active_slave(bond);
1731                 unblock_netpoll_tx();
1732         }
1733
1734         if (bond_mode_uses_xmit_hash(bond))
1735                 bond_update_slave_arr(bond, NULL);
1736
1737         netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1738                     slave_dev->name,
1739                     bond_is_active_slave(new_slave) ? "an active" : "a backup",
1740                     new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1741
1742         /* enslave is successful */
1743         bond_queue_slave_event(new_slave);
1744         return 0;
1745
1746 /* Undo stages on error */
1747 err_upper_unlink:
1748         bond_upper_dev_unlink(bond, new_slave);
1749
1750 err_unregister:
1751         netdev_rx_handler_unregister(slave_dev);
1752
1753 err_detach:
1754         if (!bond_uses_primary(bond))
1755                 bond_hw_addr_flush(bond_dev, slave_dev);
1756
1757         vlan_vids_del_by_dev(slave_dev, bond_dev);
1758         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1759                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1760         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1761                 block_netpoll_tx();
1762                 bond_change_active_slave(bond, NULL);
1763                 bond_select_active_slave(bond);
1764                 unblock_netpoll_tx();
1765         }
1766         /* either primary_slave or curr_active_slave might've changed */
1767         synchronize_rcu();
1768         slave_disable_netpoll(new_slave);
1769
1770 err_close:
1771         slave_dev->priv_flags &= ~IFF_BONDING;
1772         dev_close(slave_dev);
1773
1774 err_restore_mac:
1775         slave_dev->flags &= ~IFF_SLAVE;
1776         if (!bond->params.fail_over_mac ||
1777             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1778                 /* XXX TODO - fom follow mode needs to change master's
1779                  * MAC if this slave's MAC is in use by the bond, or at
1780                  * least print a warning.
1781                  */
1782                 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
1783                                   new_slave->dev->addr_len);
1784                 ss.ss_family = slave_dev->type;
1785                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
1786         }
1787
1788 err_restore_mtu:
1789         dev_set_mtu(slave_dev, new_slave->original_mtu);
1790
1791 err_free:
1792         bond_free_slave(new_slave);
1793
1794 err_undo_flags:
1795         /* Enslave of first slave has failed and we need to fix master's mac */
1796         if (!bond_has_slaves(bond)) {
1797                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1798                                             slave_dev->dev_addr))
1799                         eth_hw_addr_random(bond_dev);
1800                 if (bond_dev->type != ARPHRD_ETHER) {
1801                         dev_close(bond_dev);
1802                         ether_setup(bond_dev);
1803                         bond_dev->flags |= IFF_MASTER;
1804                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1805                 }
1806         }
1807
1808         return res;
1809 }
1810
1811 /* Try to release the slave device <slave> from the bond device <master>
1812  * It is legal to access curr_active_slave without a lock because all the function
1813  * is RTNL-locked. If "all" is true it means that the function is being called
1814  * while destroying a bond interface and all slaves are being released.
1815  *
1816  * The rules for slave state should be:
1817  *   for Active/Backup:
1818  *     Active stays on all backups go down
1819  *   for Bonded connections:
1820  *     The first up interface should be left on and all others downed.
1821  */
1822 static int __bond_release_one(struct net_device *bond_dev,
1823                               struct net_device *slave_dev,
1824                               bool all, bool unregister)
1825 {
1826         struct bonding *bond = netdev_priv(bond_dev);
1827         struct slave *slave, *oldcurrent;
1828         struct sockaddr_storage ss;
1829         int old_flags = bond_dev->flags;
1830         netdev_features_t old_features = bond_dev->features;
1831
1832         /* slave is not a slave or master is not master of this slave */
1833         if (!(slave_dev->flags & IFF_SLAVE) ||
1834             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1835                 netdev_dbg(bond_dev, "cannot release %s\n",
1836                            slave_dev->name);
1837                 return -EINVAL;
1838         }
1839
1840         block_netpoll_tx();
1841
1842         slave = bond_get_slave_by_dev(bond, slave_dev);
1843         if (!slave) {
1844                 /* not a slave of this bond */
1845                 netdev_info(bond_dev, "%s not enslaved\n",
1846                             slave_dev->name);
1847                 unblock_netpoll_tx();
1848                 return -EINVAL;
1849         }
1850
1851         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1852
1853         bond_sysfs_slave_del(slave);
1854
1855         /* recompute stats just before removing the slave */
1856         bond_get_stats(bond->dev, &bond->bond_stats);
1857
1858         bond_upper_dev_unlink(bond, slave);
1859         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1860          * for this slave anymore.
1861          */
1862         netdev_rx_handler_unregister(slave_dev);
1863
1864         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1865                 bond_3ad_unbind_slave(slave);
1866
1867         if (bond_mode_uses_xmit_hash(bond))
1868                 bond_update_slave_arr(bond, slave);
1869
1870         netdev_info(bond_dev, "Releasing %s interface %s\n",
1871                     bond_is_active_slave(slave) ? "active" : "backup",
1872                     slave_dev->name);
1873
1874         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1875
1876         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1877
1878         if (!all && (!bond->params.fail_over_mac ||
1879                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1880                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1881                     bond_has_slaves(bond))
1882                         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",
1883                                     slave_dev->name, slave->perm_hwaddr,
1884                                     bond_dev->name, slave_dev->name);
1885         }
1886
1887         if (rtnl_dereference(bond->primary_slave) == slave)
1888                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1889
1890         if (oldcurrent == slave)
1891                 bond_change_active_slave(bond, NULL);
1892
1893         if (bond_is_lb(bond)) {
1894                 /* Must be called only after the slave has been
1895                  * detached from the list and the curr_active_slave
1896                  * has been cleared (if our_slave == old_current),
1897                  * but before a new active slave is selected.
1898                  */
1899                 bond_alb_deinit_slave(bond, slave);
1900         }
1901
1902         if (all) {
1903                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1904         } else if (oldcurrent == slave) {
1905                 /* Note that we hold RTNL over this sequence, so there
1906                  * is no concern that another slave add/remove event
1907                  * will interfere.
1908                  */
1909                 bond_select_active_slave(bond);
1910         }
1911
1912         if (!bond_has_slaves(bond)) {
1913                 bond_set_carrier(bond);
1914                 eth_hw_addr_random(bond_dev);
1915         }
1916
1917         unblock_netpoll_tx();
1918         synchronize_rcu();
1919         bond->slave_cnt--;
1920
1921         if (!bond_has_slaves(bond)) {
1922                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1923                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1924         }
1925
1926         bond_compute_features(bond);
1927         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1928             (old_features & NETIF_F_VLAN_CHALLENGED))
1929                 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1930                             slave_dev->name, bond_dev->name);
1931
1932         vlan_vids_del_by_dev(slave_dev, bond_dev);
1933
1934         /* If the mode uses primary, then this case was handled above by
1935          * bond_change_active_slave(..., NULL)
1936          */
1937         if (!bond_uses_primary(bond)) {
1938                 /* unset promiscuity level from slave
1939                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1940                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1941                  * value of that flag before that change, as that was the value
1942                  * when this slave was attached, so we cache at the start of the
1943                  * function and use it here. Same goes for ALLMULTI below
1944                  */
1945                 if (old_flags & IFF_PROMISC)
1946                         dev_set_promiscuity(slave_dev, -1);
1947
1948                 /* unset allmulti level from slave */
1949                 if (old_flags & IFF_ALLMULTI)
1950                         dev_set_allmulti(slave_dev, -1);
1951
1952                 bond_hw_addr_flush(bond_dev, slave_dev);
1953         }
1954
1955         slave_disable_netpoll(slave);
1956
1957         /* close slave before restoring its mac address */
1958         dev_close(slave_dev);
1959
1960         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1961             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1962                 /* restore original ("permanent") mac address */
1963                 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
1964                                   slave->dev->addr_len);
1965                 ss.ss_family = slave_dev->type;
1966                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
1967         }
1968
1969         if (unregister)
1970                 __dev_set_mtu(slave_dev, slave->original_mtu);
1971         else
1972                 dev_set_mtu(slave_dev, slave->original_mtu);
1973
1974         slave_dev->priv_flags &= ~IFF_BONDING;
1975
1976         bond_free_slave(slave);
1977
1978         return 0;
1979 }
1980
1981 /* A wrapper used because of ndo_del_link */
1982 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1983 {
1984         return __bond_release_one(bond_dev, slave_dev, false, false);
1985 }
1986
1987 /* First release a slave and then destroy the bond if no more slaves are left.
1988  * Must be under rtnl_lock when this function is called.
1989  */
1990 static int  bond_release_and_destroy(struct net_device *bond_dev,
1991                                      struct net_device *slave_dev)
1992 {
1993         struct bonding *bond = netdev_priv(bond_dev);
1994         int ret;
1995
1996         ret = __bond_release_one(bond_dev, slave_dev, false, true);
1997         if (ret == 0 && !bond_has_slaves(bond)) {
1998                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1999                 netdev_info(bond_dev, "Destroying bond %s\n",
2000                             bond_dev->name);
2001                 bond_remove_proc_entry(bond);
2002                 unregister_netdevice(bond_dev);
2003         }
2004         return ret;
2005 }
2006
2007 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2008 {
2009         struct bonding *bond = netdev_priv(bond_dev);
2010         bond_fill_ifbond(bond, info);
2011 }
2012
2013 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2014 {
2015         struct bonding *bond = netdev_priv(bond_dev);
2016         struct list_head *iter;
2017         int i = 0, res = -ENODEV;
2018         struct slave *slave;
2019
2020         bond_for_each_slave(bond, slave, iter) {
2021                 if (i++ == (int)info->slave_id) {
2022                         res = 0;
2023                         bond_fill_ifslave(slave, info);
2024                         break;
2025                 }
2026         }
2027
2028         return res;
2029 }
2030
2031 /*-------------------------------- Monitoring -------------------------------*/
2032
2033 /* called with rcu_read_lock() */
2034 static int bond_miimon_inspect(struct bonding *bond)
2035 {
2036         int link_state, commit = 0;
2037         struct list_head *iter;
2038         struct slave *slave;
2039         bool ignore_updelay;
2040
2041         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2042
2043         bond_for_each_slave_rcu(bond, slave, iter) {
2044                 slave->new_link = BOND_LINK_NOCHANGE;
2045
2046                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2047
2048                 switch (slave->link) {
2049                 case BOND_LINK_UP:
2050                         if (link_state)
2051                                 continue;
2052
2053                         bond_propose_link_state(slave, BOND_LINK_FAIL);
2054                         commit++;
2055                         slave->delay = bond->params.downdelay;
2056                         if (slave->delay) {
2057                                 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2058                                             (BOND_MODE(bond) ==
2059                                              BOND_MODE_ACTIVEBACKUP) ?
2060                                              (bond_is_active_slave(slave) ?
2061                                               "active " : "backup ") : "",
2062                                             slave->dev->name,
2063                                             bond->params.downdelay * bond->params.miimon);
2064                         }
2065                         /*FALLTHRU*/
2066                 case BOND_LINK_FAIL:
2067                         if (link_state) {
2068                                 /* recovered before downdelay expired */
2069                                 bond_propose_link_state(slave, BOND_LINK_UP);
2070                                 slave->last_link_up = jiffies;
2071                                 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2072                                             (bond->params.downdelay - slave->delay) *
2073                                             bond->params.miimon,
2074                                             slave->dev->name);
2075                                 commit++;
2076                                 continue;
2077                         }
2078
2079                         if (slave->delay <= 0) {
2080                                 slave->new_link = BOND_LINK_DOWN;
2081                                 commit++;
2082                                 continue;
2083                         }
2084
2085                         slave->delay--;
2086                         break;
2087
2088                 case BOND_LINK_DOWN:
2089                         if (!link_state)
2090                                 continue;
2091
2092                         bond_propose_link_state(slave, BOND_LINK_BACK);
2093                         commit++;
2094                         slave->delay = bond->params.updelay;
2095
2096                         if (slave->delay) {
2097                                 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2098                                             slave->dev->name,
2099                                             ignore_updelay ? 0 :
2100                                             bond->params.updelay *
2101                                             bond->params.miimon);
2102                         }
2103                         /*FALLTHRU*/
2104                 case BOND_LINK_BACK:
2105                         if (!link_state) {
2106                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2107                                 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2108                                             (bond->params.updelay - slave->delay) *
2109                                             bond->params.miimon,
2110                                             slave->dev->name);
2111                                 commit++;
2112                                 continue;
2113                         }
2114
2115                         if (ignore_updelay)
2116                                 slave->delay = 0;
2117
2118                         if (slave->delay <= 0) {
2119                                 slave->new_link = BOND_LINK_UP;
2120                                 commit++;
2121                                 ignore_updelay = false;
2122                                 continue;
2123                         }
2124
2125                         slave->delay--;
2126                         break;
2127                 }
2128         }
2129
2130         return commit;
2131 }
2132
2133 static void bond_miimon_commit(struct bonding *bond)
2134 {
2135         struct list_head *iter;
2136         struct slave *slave, *primary;
2137
2138         bond_for_each_slave(bond, slave, iter) {
2139                 switch (slave->new_link) {
2140                 case BOND_LINK_NOCHANGE:
2141                         continue;
2142
2143                 case BOND_LINK_UP:
2144                         if (bond_update_speed_duplex(slave) &&
2145                             bond_needs_speed_duplex(bond)) {
2146                                 slave->link = BOND_LINK_DOWN;
2147                                 if (net_ratelimit())
2148                                         netdev_warn(bond->dev,
2149                                                     "failed to get link speed/duplex for %s\n",
2150                                                     slave->dev->name);
2151                                 continue;
2152                         }
2153                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2154                                                   BOND_SLAVE_NOTIFY_NOW);
2155                         slave->last_link_up = jiffies;
2156
2157                         primary = rtnl_dereference(bond->primary_slave);
2158                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2159                                 /* prevent it from being the active one */
2160                                 bond_set_backup_slave(slave);
2161                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2162                                 /* make it immediately active */
2163                                 bond_set_active_slave(slave);
2164                         } else if (slave != primary) {
2165                                 /* prevent it from being the active one */
2166                                 bond_set_backup_slave(slave);
2167                         }
2168
2169                         netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2170                                     slave->dev->name,
2171                                     slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2172                                     slave->duplex ? "full" : "half");
2173
2174                         /* notify ad that the link status has changed */
2175                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2176                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2177
2178                         if (bond_is_lb(bond))
2179                                 bond_alb_handle_link_change(bond, slave,
2180                                                             BOND_LINK_UP);
2181
2182                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2183                                 bond_update_slave_arr(bond, NULL);
2184
2185                         if (!bond->curr_active_slave || slave == primary)
2186                                 goto do_failover;
2187
2188                         continue;
2189
2190                 case BOND_LINK_DOWN:
2191                         if (slave->link_failure_count < UINT_MAX)
2192                                 slave->link_failure_count++;
2193
2194                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2195                                                   BOND_SLAVE_NOTIFY_NOW);
2196
2197                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2198                             BOND_MODE(bond) == BOND_MODE_8023AD)
2199                                 bond_set_slave_inactive_flags(slave,
2200                                                               BOND_SLAVE_NOTIFY_NOW);
2201
2202                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2203                                     slave->dev->name);
2204
2205                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2206                                 bond_3ad_handle_link_change(slave,
2207                                                             BOND_LINK_DOWN);
2208
2209                         if (bond_is_lb(bond))
2210                                 bond_alb_handle_link_change(bond, slave,
2211                                                             BOND_LINK_DOWN);
2212
2213                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2214                                 bond_update_slave_arr(bond, NULL);
2215
2216                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2217                                 goto do_failover;
2218
2219                         continue;
2220
2221                 default:
2222                         netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2223                                    slave->new_link, slave->dev->name);
2224                         slave->new_link = BOND_LINK_NOCHANGE;
2225
2226                         continue;
2227                 }
2228
2229 do_failover:
2230                 block_netpoll_tx();
2231                 bond_select_active_slave(bond);
2232                 unblock_netpoll_tx();
2233         }
2234
2235         bond_set_carrier(bond);
2236 }
2237
2238 /* bond_mii_monitor
2239  *
2240  * Really a wrapper that splits the mii monitor into two phases: an
2241  * inspection, then (if inspection indicates something needs to be done)
2242  * an acquisition of appropriate locks followed by a commit phase to
2243  * implement whatever link state changes are indicated.
2244  */
2245 static void bond_mii_monitor(struct work_struct *work)
2246 {
2247         struct bonding *bond = container_of(work, struct bonding,
2248                                             mii_work.work);
2249         bool should_notify_peers = false;
2250         unsigned long delay;
2251         struct slave *slave;
2252         struct list_head *iter;
2253
2254         delay = msecs_to_jiffies(bond->params.miimon);
2255
2256         if (!bond_has_slaves(bond))
2257                 goto re_arm;
2258
2259         rcu_read_lock();
2260
2261         should_notify_peers = bond_should_notify_peers(bond);
2262
2263         if (bond_miimon_inspect(bond)) {
2264                 rcu_read_unlock();
2265
2266                 /* Race avoidance with bond_close cancel of workqueue */
2267                 if (!rtnl_trylock()) {
2268                         delay = 1;
2269                         should_notify_peers = false;
2270                         goto re_arm;
2271                 }
2272
2273                 bond_for_each_slave(bond, slave, iter) {
2274                         bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2275                 }
2276                 bond_miimon_commit(bond);
2277
2278                 rtnl_unlock();  /* might sleep, hold no other locks */
2279         } else
2280                 rcu_read_unlock();
2281
2282 re_arm:
2283         if (bond->params.miimon)
2284                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2285
2286         if (should_notify_peers) {
2287                 if (!rtnl_trylock())
2288                         return;
2289                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2290                 rtnl_unlock();
2291         }
2292 }
2293
2294 static int bond_upper_dev_walk(struct net_device *upper, void *data)
2295 {
2296         __be32 ip = *((__be32 *)data);
2297
2298         return ip == bond_confirm_addr(upper, 0, ip);
2299 }
2300
2301 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2302 {
2303         bool ret = false;
2304
2305         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2306                 return true;
2307
2308         rcu_read_lock();
2309         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2310                 ret = true;
2311         rcu_read_unlock();
2312
2313         return ret;
2314 }
2315
2316 /* We go to the (large) trouble of VLAN tagging ARP frames because
2317  * switches in VLAN mode (especially if ports are configured as
2318  * "native" to a VLAN) might not pass non-tagged frames.
2319  */
2320 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2321                           __be32 dest_ip, __be32 src_ip,
2322                           struct bond_vlan_tag *tags)
2323 {
2324         struct sk_buff *skb;
2325         struct bond_vlan_tag *outer_tag = tags;
2326
2327         netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2328                    arp_op, slave_dev->name, &dest_ip, &src_ip);
2329
2330         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2331                          NULL, slave_dev->dev_addr, NULL);
2332
2333         if (!skb) {
2334                 net_err_ratelimited("ARP packet allocation failed\n");
2335                 return;
2336         }
2337
2338         if (!tags || tags->vlan_proto == VLAN_N_VID)
2339                 goto xmit;
2340
2341         tags++;
2342
2343         /* Go through all the tags backwards and add them to the packet */
2344         while (tags->vlan_proto != VLAN_N_VID) {
2345                 if (!tags->vlan_id) {
2346                         tags++;
2347                         continue;
2348                 }
2349
2350                 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2351                            ntohs(outer_tag->vlan_proto), tags->vlan_id);
2352                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2353                                                 tags->vlan_id);
2354                 if (!skb) {
2355                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2356                         return;
2357                 }
2358
2359                 tags++;
2360         }
2361         /* Set the outer tag */
2362         if (outer_tag->vlan_id) {
2363                 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2364                            ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2365                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2366                                        outer_tag->vlan_id);
2367         }
2368
2369 xmit:
2370         arp_xmit(skb);
2371 }
2372
2373 /* Validate the device path between the @start_dev and the @end_dev.
2374  * The path is valid if the @end_dev is reachable through device
2375  * stacking.
2376  * When the path is validated, collect any vlan information in the
2377  * path.
2378  */
2379 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2380                                               struct net_device *end_dev,
2381                                               int level)
2382 {
2383         struct bond_vlan_tag *tags;
2384         struct net_device *upper;
2385         struct list_head  *iter;
2386
2387         if (start_dev == end_dev) {
2388                 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2389                 if (!tags)
2390                         return ERR_PTR(-ENOMEM);
2391                 tags[level].vlan_proto = VLAN_N_VID;
2392                 return tags;
2393         }
2394
2395         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2396                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2397                 if (IS_ERR_OR_NULL(tags)) {
2398                         if (IS_ERR(tags))
2399                                 return tags;
2400                         continue;
2401                 }
2402                 if (is_vlan_dev(upper)) {
2403                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2404                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2405                 }
2406
2407                 return tags;
2408         }
2409
2410         return NULL;
2411 }
2412
2413 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2414 {
2415         struct rtable *rt;
2416         struct bond_vlan_tag *tags;
2417         __be32 *targets = bond->params.arp_targets, addr;
2418         int i;
2419
2420         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2421                 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2422                 tags = NULL;
2423
2424                 /* Find out through which dev should the packet go */
2425                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2426                                      RTO_ONLINK, 0);
2427                 if (IS_ERR(rt)) {
2428                         /* there's no route to target - try to send arp
2429                          * probe to generate any traffic (arp_validate=0)
2430                          */
2431                         if (bond->params.arp_validate)
2432                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2433                                                      bond->dev->name,
2434                                                      &targets[i]);
2435                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2436                                       0, tags);
2437                         continue;
2438                 }
2439
2440                 /* bond device itself */
2441                 if (rt->dst.dev == bond->dev)
2442                         goto found;
2443
2444                 rcu_read_lock();
2445                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2446                 rcu_read_unlock();
2447
2448                 if (!IS_ERR_OR_NULL(tags))
2449                         goto found;
2450
2451                 /* Not our device - skip */
2452                 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2453                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2454
2455                 ip_rt_put(rt);
2456                 continue;
2457
2458 found:
2459                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2460                 ip_rt_put(rt);
2461                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2462                               addr, tags);
2463                 kfree(tags);
2464         }
2465 }
2466
2467 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2468 {
2469         int i;
2470
2471         if (!sip || !bond_has_this_ip(bond, tip)) {
2472                 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2473                            &sip, &tip);
2474                 return;
2475         }
2476
2477         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2478         if (i == -1) {
2479                 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2480                            &sip);
2481                 return;
2482         }
2483         slave->last_rx = jiffies;
2484         slave->target_last_arp_rx[i] = jiffies;
2485 }
2486
2487 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2488                  struct slave *slave)
2489 {
2490         struct arphdr *arp = (struct arphdr *)skb->data;
2491         struct slave *curr_active_slave, *curr_arp_slave;
2492         unsigned char *arp_ptr;
2493         __be32 sip, tip;
2494         int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2495
2496         if (!slave_do_arp_validate(bond, slave)) {
2497                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2498                     !slave_do_arp_validate_only(bond))
2499                         slave->last_rx = jiffies;
2500                 return RX_HANDLER_ANOTHER;
2501         } else if (!is_arp) {
2502                 return RX_HANDLER_ANOTHER;
2503         }
2504
2505         alen = arp_hdr_len(bond->dev);
2506
2507         netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2508                    skb->dev->name);
2509
2510         if (alen > skb_headlen(skb)) {
2511                 arp = kmalloc(alen, GFP_ATOMIC);
2512                 if (!arp)
2513                         goto out_unlock;
2514                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2515                         goto out_unlock;
2516         }
2517
2518         if (arp->ar_hln != bond->dev->addr_len ||
2519             skb->pkt_type == PACKET_OTHERHOST ||
2520             skb->pkt_type == PACKET_LOOPBACK ||
2521             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2522             arp->ar_pro != htons(ETH_P_IP) ||
2523             arp->ar_pln != 4)
2524                 goto out_unlock;
2525
2526         arp_ptr = (unsigned char *)(arp + 1);
2527         arp_ptr += bond->dev->addr_len;
2528         memcpy(&sip, arp_ptr, 4);
2529         arp_ptr += 4 + bond->dev->addr_len;
2530         memcpy(&tip, arp_ptr, 4);
2531
2532         netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2533                    slave->dev->name, bond_slave_state(slave),
2534                      bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2535                      &sip, &tip);
2536
2537         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2538         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2539
2540         /* We 'trust' the received ARP enough to validate it if:
2541          *
2542          * (a) the slave receiving the ARP is active (which includes the
2543          * current ARP slave, if any), or
2544          *
2545          * (b) the receiving slave isn't active, but there is a currently
2546          * active slave and it received valid arp reply(s) after it became
2547          * the currently active slave, or
2548          *
2549          * (c) there is an ARP slave that sent an ARP during the prior ARP
2550          * interval, and we receive an ARP reply on any slave.  We accept
2551          * these because switch FDB update delays may deliver the ARP
2552          * reply to a slave other than the sender of the ARP request.
2553          *
2554          * Note: for (b), backup slaves are receiving the broadcast ARP
2555          * request, not a reply.  This request passes from the sending
2556          * slave through the L2 switch(es) to the receiving slave.  Since
2557          * this is checking the request, sip/tip are swapped for
2558          * validation.
2559          *
2560          * This is done to avoid endless looping when we can't reach the
2561          * arp_ip_target and fool ourselves with our own arp requests.
2562          */
2563         if (bond_is_active_slave(slave))
2564                 bond_validate_arp(bond, slave, sip, tip);
2565         else if (curr_active_slave &&
2566                  time_after(slave_last_rx(bond, curr_active_slave),
2567                             curr_active_slave->last_link_up))
2568                 bond_validate_arp(bond, slave, tip, sip);
2569         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2570                  bond_time_in_interval(bond,
2571                                        dev_trans_start(curr_arp_slave->dev), 1))
2572                 bond_validate_arp(bond, slave, sip, tip);
2573
2574 out_unlock:
2575         if (arp != (struct arphdr *)skb->data)
2576                 kfree(arp);
2577         return RX_HANDLER_ANOTHER;
2578 }
2579
2580 /* function to verify if we're in the arp_interval timeslice, returns true if
2581  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2582  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2583  */
2584 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2585                                   int mod)
2586 {
2587         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2588
2589         return time_in_range(jiffies,
2590                              last_act - delta_in_ticks,
2591                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2592 }
2593
2594 /* This function is called regularly to monitor each slave's link
2595  * ensuring that traffic is being sent and received when arp monitoring
2596  * is used in load-balancing mode. if the adapter has been dormant, then an
2597  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2598  * arp monitoring in active backup mode.
2599  */
2600 static void bond_loadbalance_arp_mon(struct bonding *bond)
2601 {
2602         struct slave *slave, *oldcurrent;
2603         struct list_head *iter;
2604         int do_failover = 0, slave_state_changed = 0;
2605
2606         if (!bond_has_slaves(bond))
2607                 goto re_arm;
2608
2609         rcu_read_lock();
2610
2611         oldcurrent = rcu_dereference(bond->curr_active_slave);
2612         /* see if any of the previous devices are up now (i.e. they have
2613          * xmt and rcv traffic). the curr_active_slave does not come into
2614          * the picture unless it is null. also, slave->last_link_up is not
2615          * needed here because we send an arp on each slave and give a slave
2616          * as long as it needs to get the tx/rx within the delta.
2617          * TODO: what about up/down delay in arp mode? it wasn't here before
2618          *       so it can wait
2619          */
2620         bond_for_each_slave_rcu(bond, slave, iter) {
2621                 unsigned long trans_start = dev_trans_start(slave->dev);
2622
2623                 slave->new_link = BOND_LINK_NOCHANGE;
2624
2625                 if (slave->link != BOND_LINK_UP) {
2626                         if (bond_time_in_interval(bond, trans_start, 1) &&
2627                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2628
2629                                 slave->new_link = BOND_LINK_UP;
2630                                 slave_state_changed = 1;
2631
2632                                 /* primary_slave has no meaning in round-robin
2633                                  * mode. the window of a slave being up and
2634                                  * curr_active_slave being null after enslaving
2635                                  * is closed.
2636                                  */
2637                                 if (!oldcurrent) {
2638                                         netdev_info(bond->dev, "link status definitely up for interface %s\n",
2639                                                     slave->dev->name);
2640                                         do_failover = 1;
2641                                 } else {
2642                                         netdev_info(bond->dev, "interface %s is now up\n",
2643                                                     slave->dev->name);
2644                                 }
2645                         }
2646                 } else {
2647                         /* slave->link == BOND_LINK_UP */
2648
2649                         /* not all switches will respond to an arp request
2650                          * when the source ip is 0, so don't take the link down
2651                          * if we don't know our ip yet
2652                          */
2653                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2654                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2655
2656                                 slave->new_link = BOND_LINK_DOWN;
2657                                 slave_state_changed = 1;
2658
2659                                 if (slave->link_failure_count < UINT_MAX)
2660                                         slave->link_failure_count++;
2661
2662                                 netdev_info(bond->dev, "interface %s is now down\n",
2663                                             slave->dev->name);
2664
2665                                 if (slave == oldcurrent)
2666                                         do_failover = 1;
2667                         }
2668                 }
2669
2670                 /* note: if switch is in round-robin mode, all links
2671                  * must tx arp to ensure all links rx an arp - otherwise
2672                  * links may oscillate or not come up at all; if switch is
2673                  * in something like xor mode, there is nothing we can
2674                  * do - all replies will be rx'ed on same link causing slaves
2675                  * to be unstable during low/no traffic periods
2676                  */
2677                 if (bond_slave_is_up(slave))
2678                         bond_arp_send_all(bond, slave);
2679         }
2680
2681         rcu_read_unlock();
2682
2683         if (do_failover || slave_state_changed) {
2684                 if (!rtnl_trylock())
2685                         goto re_arm;
2686
2687                 bond_for_each_slave(bond, slave, iter) {
2688                         if (slave->new_link != BOND_LINK_NOCHANGE)
2689                                 slave->link = slave->new_link;
2690                 }
2691
2692                 if (slave_state_changed) {
2693                         bond_slave_state_change(bond);
2694                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2695                                 bond_update_slave_arr(bond, NULL);
2696                 }
2697                 if (do_failover) {
2698                         block_netpoll_tx();
2699                         bond_select_active_slave(bond);
2700                         unblock_netpoll_tx();
2701                 }
2702                 rtnl_unlock();
2703         }
2704
2705 re_arm:
2706         if (bond->params.arp_interval)
2707                 queue_delayed_work(bond->wq, &bond->arp_work,
2708                                    msecs_to_jiffies(bond->params.arp_interval));
2709 }
2710
2711 /* Called to inspect slaves for active-backup mode ARP monitor link state
2712  * changes.  Sets new_link in slaves to specify what action should take
2713  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2714  * to link states must be committed.
2715  *
2716  * Called with rcu_read_lock held.
2717  */
2718 static int bond_ab_arp_inspect(struct bonding *bond)
2719 {
2720         unsigned long trans_start, last_rx;
2721         struct list_head *iter;
2722         struct slave *slave;
2723         int commit = 0;
2724
2725         bond_for_each_slave_rcu(bond, slave, iter) {
2726                 slave->new_link = BOND_LINK_NOCHANGE;
2727                 last_rx = slave_last_rx(bond, slave);
2728
2729                 if (slave->link != BOND_LINK_UP) {
2730                         if (bond_time_in_interval(bond, last_rx, 1)) {
2731                                 slave->new_link = BOND_LINK_UP;
2732                                 commit++;
2733                         }
2734                         continue;
2735                 }
2736
2737                 /* Give slaves 2*delta after being enslaved or made
2738                  * active.  This avoids bouncing, as the last receive
2739                  * times need a full ARP monitor cycle to be updated.
2740                  */
2741                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2742                         continue;
2743
2744                 /* Backup slave is down if:
2745                  * - No current_arp_slave AND
2746                  * - more than 3*delta since last receive AND
2747                  * - the bond has an IP address
2748                  *
2749                  * Note: a non-null current_arp_slave indicates
2750                  * the curr_active_slave went down and we are
2751                  * searching for a new one; under this condition
2752                  * we only take the curr_active_slave down - this
2753                  * gives each slave a chance to tx/rx traffic
2754                  * before being taken out
2755                  */
2756                 if (!bond_is_active_slave(slave) &&
2757                     !rcu_access_pointer(bond->current_arp_slave) &&
2758                     !bond_time_in_interval(bond, last_rx, 3)) {
2759                         slave->new_link = BOND_LINK_DOWN;
2760                         commit++;
2761                 }
2762
2763                 /* Active slave is down if:
2764                  * - more than 2*delta since transmitting OR
2765                  * - (more than 2*delta since receive AND
2766                  *    the bond has an IP address)
2767                  */
2768                 trans_start = dev_trans_start(slave->dev);
2769                 if (bond_is_active_slave(slave) &&
2770                     (!bond_time_in_interval(bond, trans_start, 2) ||
2771                      !bond_time_in_interval(bond, last_rx, 2))) {
2772                         slave->new_link = BOND_LINK_DOWN;
2773                         commit++;
2774                 }
2775         }
2776
2777         return commit;
2778 }
2779
2780 /* Called to commit link state changes noted by inspection step of
2781  * active-backup mode ARP monitor.
2782  *
2783  * Called with RTNL hold.
2784  */
2785 static void bond_ab_arp_commit(struct bonding *bond)
2786 {
2787         unsigned long trans_start;
2788         struct list_head *iter;
2789         struct slave *slave;
2790
2791         bond_for_each_slave(bond, slave, iter) {
2792                 switch (slave->new_link) {
2793                 case BOND_LINK_NOCHANGE:
2794                         continue;
2795
2796                 case BOND_LINK_UP:
2797                         trans_start = dev_trans_start(slave->dev);
2798                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2799                             (!rtnl_dereference(bond->curr_active_slave) &&
2800                              bond_time_in_interval(bond, trans_start, 1))) {
2801                                 struct slave *current_arp_slave;
2802
2803                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2804                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
2805                                                           BOND_SLAVE_NOTIFY_NOW);
2806                                 if (current_arp_slave) {
2807                                         bond_set_slave_inactive_flags(
2808                                                 current_arp_slave,
2809                                                 BOND_SLAVE_NOTIFY_NOW);
2810                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2811                                 }
2812
2813                                 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2814                                             slave->dev->name);
2815
2816                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2817                                     slave == rtnl_dereference(bond->primary_slave))
2818                                         goto do_failover;
2819
2820                         }
2821
2822                         continue;
2823
2824                 case BOND_LINK_DOWN:
2825                         if (slave->link_failure_count < UINT_MAX)
2826                                 slave->link_failure_count++;
2827
2828                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2829                                                   BOND_SLAVE_NOTIFY_NOW);
2830                         bond_set_slave_inactive_flags(slave,
2831                                                       BOND_SLAVE_NOTIFY_NOW);
2832
2833                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2834                                     slave->dev->name);
2835
2836                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2837                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2838                                 goto do_failover;
2839                         }
2840
2841                         continue;
2842
2843                 default:
2844                         netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2845                                    slave->new_link, slave->dev->name);
2846                         continue;
2847                 }
2848
2849 do_failover:
2850                 block_netpoll_tx();
2851                 bond_select_active_slave(bond);
2852                 unblock_netpoll_tx();
2853         }
2854
2855         bond_set_carrier(bond);
2856 }
2857
2858 /* Send ARP probes for active-backup mode ARP monitor.
2859  *
2860  * Called with rcu_read_lock held.
2861  */
2862 static bool bond_ab_arp_probe(struct bonding *bond)
2863 {
2864         struct slave *slave, *before = NULL, *new_slave = NULL,
2865                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2866                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2867         struct list_head *iter;
2868         bool found = false;
2869         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2870
2871         if (curr_arp_slave && curr_active_slave)
2872                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2873                             curr_arp_slave->dev->name,
2874                             curr_active_slave->dev->name);
2875
2876         if (curr_active_slave) {
2877                 bond_arp_send_all(bond, curr_active_slave);
2878                 return should_notify_rtnl;
2879         }
2880
2881         /* if we don't have a curr_active_slave, search for the next available
2882          * backup slave from the current_arp_slave and make it the candidate
2883          * for becoming the curr_active_slave
2884          */
2885
2886         if (!curr_arp_slave) {
2887                 curr_arp_slave = bond_first_slave_rcu(bond);
2888                 if (!curr_arp_slave)
2889                         return should_notify_rtnl;
2890         }
2891
2892         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2893
2894         bond_for_each_slave_rcu(bond, slave, iter) {
2895                 if (!found && !before && bond_slave_is_up(slave))
2896                         before = slave;
2897
2898                 if (found && !new_slave && bond_slave_is_up(slave))
2899                         new_slave = slave;
2900                 /* if the link state is up at this point, we
2901                  * mark it down - this can happen if we have
2902                  * simultaneous link failures and
2903                  * reselect_active_interface doesn't make this
2904                  * one the current slave so it is still marked
2905                  * up when it is actually down
2906                  */
2907                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2908                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2909                                                   BOND_SLAVE_NOTIFY_LATER);
2910                         if (slave->link_failure_count < UINT_MAX)
2911                                 slave->link_failure_count++;
2912
2913                         bond_set_slave_inactive_flags(slave,
2914                                                       BOND_SLAVE_NOTIFY_LATER);
2915
2916                         netdev_info(bond->dev, "backup interface %s is now down\n",
2917                                     slave->dev->name);
2918                 }
2919                 if (slave == curr_arp_slave)
2920                         found = true;
2921         }
2922
2923         if (!new_slave && before)
2924                 new_slave = before;
2925
2926         if (!new_slave)
2927                 goto check_state;
2928
2929         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2930                                   BOND_SLAVE_NOTIFY_LATER);
2931         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2932         bond_arp_send_all(bond, new_slave);
2933         new_slave->last_link_up = jiffies;
2934         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2935
2936 check_state:
2937         bond_for_each_slave_rcu(bond, slave, iter) {
2938                 if (slave->should_notify || slave->should_notify_link) {
2939                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2940                         break;
2941                 }
2942         }
2943         return should_notify_rtnl;
2944 }
2945
2946 static void bond_activebackup_arp_mon(struct bonding *bond)
2947 {
2948         bool should_notify_peers = false;
2949         bool should_notify_rtnl = false;
2950         int delta_in_ticks;
2951
2952         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2953
2954         if (!bond_has_slaves(bond))
2955                 goto re_arm;
2956
2957         rcu_read_lock();
2958
2959         should_notify_peers = bond_should_notify_peers(bond);
2960
2961         if (bond_ab_arp_inspect(bond)) {
2962                 rcu_read_unlock();
2963
2964                 /* Race avoidance with bond_close flush of workqueue */
2965                 if (!rtnl_trylock()) {
2966                         delta_in_ticks = 1;
2967                         should_notify_peers = false;
2968                         goto re_arm;
2969                 }
2970
2971                 bond_ab_arp_commit(bond);
2972
2973                 rtnl_unlock();
2974                 rcu_read_lock();
2975         }
2976
2977         should_notify_rtnl = bond_ab_arp_probe(bond);
2978         rcu_read_unlock();
2979
2980 re_arm:
2981         if (bond->params.arp_interval)
2982                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2983
2984         if (should_notify_peers || should_notify_rtnl) {
2985                 if (!rtnl_trylock())
2986                         return;
2987
2988                 if (should_notify_peers)
2989                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2990                                                  bond->dev);
2991                 if (should_notify_rtnl) {
2992                         bond_slave_state_notify(bond);
2993                         bond_slave_link_notify(bond);
2994                 }
2995
2996                 rtnl_unlock();
2997         }
2998 }
2999
3000 static void bond_arp_monitor(struct work_struct *work)
3001 {
3002         struct bonding *bond = container_of(work, struct bonding,
3003                                             arp_work.work);
3004
3005         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3006                 bond_activebackup_arp_mon(bond);
3007         else
3008                 bond_loadbalance_arp_mon(bond);
3009 }
3010
3011 /*-------------------------- netdev event handling --------------------------*/
3012
3013 /* Change device name */
3014 static int bond_event_changename(struct bonding *bond)
3015 {
3016         bond_remove_proc_entry(bond);
3017         bond_create_proc_entry(bond);
3018
3019         bond_debug_reregister(bond);
3020
3021         return NOTIFY_DONE;
3022 }
3023
3024 static int bond_master_netdev_event(unsigned long event,
3025                                     struct net_device *bond_dev)
3026 {
3027         struct bonding *event_bond = netdev_priv(bond_dev);
3028
3029         switch (event) {
3030         case NETDEV_CHANGENAME:
3031                 return bond_event_changename(event_bond);
3032         case NETDEV_UNREGISTER:
3033                 bond_remove_proc_entry(event_bond);
3034                 break;
3035         case NETDEV_REGISTER:
3036                 bond_create_proc_entry(event_bond);
3037                 break;
3038         case NETDEV_NOTIFY_PEERS:
3039                 if (event_bond->send_peer_notif)
3040                         event_bond->send_peer_notif--;
3041                 break;
3042         default:
3043                 break;
3044         }
3045
3046         return NOTIFY_DONE;
3047 }
3048
3049 static int bond_slave_netdev_event(unsigned long event,
3050                                    struct net_device *slave_dev)
3051 {
3052         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3053         struct bonding *bond;
3054         struct net_device *bond_dev;
3055
3056         /* A netdev event can be generated while enslaving a device
3057          * before netdev_rx_handler_register is called in which case
3058          * slave will be NULL
3059          */
3060         if (!slave)
3061                 return NOTIFY_DONE;
3062         bond_dev = slave->bond->dev;
3063         bond = slave->bond;
3064         primary = rtnl_dereference(bond->primary_slave);
3065
3066         switch (event) {
3067         case NETDEV_UNREGISTER:
3068                 if (bond_dev->type != ARPHRD_ETHER)
3069                         bond_release_and_destroy(bond_dev, slave_dev);
3070                 else
3071                         __bond_release_one(bond_dev, slave_dev, false, true);
3072                 break;
3073         case NETDEV_UP:
3074         case NETDEV_CHANGE:
3075                 bond_update_speed_duplex(slave);
3076                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3077                         bond_3ad_adapter_speed_duplex_changed(slave);
3078                 /* Fallthrough */
3079         case NETDEV_DOWN:
3080                 /* Refresh slave-array if applicable!
3081                  * If the setup does not use miimon or arpmon (mode-specific!),
3082                  * then these events will not cause the slave-array to be
3083                  * refreshed. This will cause xmit to use a slave that is not
3084                  * usable. Avoid such situation by refeshing the array at these
3085                  * events. If these (miimon/arpmon) parameters are configured
3086                  * then array gets refreshed twice and that should be fine!
3087                  */
3088                 if (bond_mode_uses_xmit_hash(bond))
3089                         bond_update_slave_arr(bond, NULL);
3090                 break;
3091         case NETDEV_CHANGEMTU:
3092                 /* TODO: Should slaves be allowed to
3093                  * independently alter their MTU?  For
3094                  * an active-backup bond, slaves need
3095                  * not be the same type of device, so
3096                  * MTUs may vary.  For other modes,
3097                  * slaves arguably should have the
3098                  * same MTUs. To do this, we'd need to
3099                  * take over the slave's change_mtu
3100                  * function for the duration of their
3101                  * servitude.
3102                  */
3103                 break;
3104         case NETDEV_CHANGENAME:
3105                 /* we don't care if we don't have primary set */
3106                 if (!bond_uses_primary(bond) ||
3107                     !bond->params.primary[0])
3108                         break;
3109
3110                 if (slave == primary) {
3111                         /* slave's name changed - he's no longer primary */
3112                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3113                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3114                         /* we have a new primary slave */
3115                         rcu_assign_pointer(bond->primary_slave, slave);
3116                 } else { /* we didn't change primary - exit */
3117                         break;
3118                 }
3119
3120                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3121                             primary ? slave_dev->name : "none");
3122
3123                 block_netpoll_tx();
3124                 bond_select_active_slave(bond);
3125                 unblock_netpoll_tx();
3126                 break;
3127         case NETDEV_FEAT_CHANGE:
3128                 bond_compute_features(bond);
3129                 break;
3130         case NETDEV_RESEND_IGMP:
3131                 /* Propagate to master device */
3132                 call_netdevice_notifiers(event, slave->bond->dev);
3133                 break;
3134         default:
3135                 break;
3136         }
3137
3138         return NOTIFY_DONE;
3139 }
3140
3141 /* bond_netdev_event: handle netdev notifier chain events.
3142  *
3143  * This function receives events for the netdev chain.  The caller (an
3144  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3145  * locks for us to safely manipulate the slave devices (RTNL lock,
3146  * dev_probe_lock).
3147  */
3148 static int bond_netdev_event(struct notifier_block *this,
3149                              unsigned long event, void *ptr)
3150 {
3151         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3152
3153         netdev_dbg(event_dev, "event: %lx\n", event);
3154
3155         if (!(event_dev->priv_flags & IFF_BONDING))
3156                 return NOTIFY_DONE;
3157
3158         if (event_dev->flags & IFF_MASTER) {
3159                 netdev_dbg(event_dev, "IFF_MASTER\n");
3160                 return bond_master_netdev_event(event, event_dev);
3161         }
3162
3163         if (event_dev->flags & IFF_SLAVE) {
3164                 netdev_dbg(event_dev, "IFF_SLAVE\n");
3165                 return bond_slave_netdev_event(event, event_dev);
3166         }
3167
3168         return NOTIFY_DONE;
3169 }
3170
3171 static struct notifier_block bond_netdev_notifier = {
3172         .notifier_call = bond_netdev_event,
3173 };
3174
3175 /*---------------------------- Hashing Policies -----------------------------*/
3176
3177 /* L2 hash helper */
3178 static inline u32 bond_eth_hash(struct sk_buff *skb)
3179 {
3180         struct ethhdr *ep, hdr_tmp;
3181
3182         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3183         if (ep)
3184                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3185         return 0;
3186 }
3187
3188 /* Extract the appropriate headers based on bond's xmit policy */
3189 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3190                               struct flow_keys *fk)
3191 {
3192         const struct ipv6hdr *iph6;
3193         const struct iphdr *iph;
3194         int noff, proto = -1;
3195
3196         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3197                 return skb_flow_dissect_flow_keys(skb, fk, 0);
3198
3199         fk->ports.ports = 0;
3200         noff = skb_network_offset(skb);
3201         if (skb->protocol == htons(ETH_P_IP)) {
3202                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3203                         return false;
3204                 iph = ip_hdr(skb);
3205                 iph_to_flow_copy_v4addrs(fk, iph);
3206                 noff += iph->ihl << 2;
3207                 if (!ip_is_fragment(iph))
3208                         proto = iph->protocol;
3209         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3210                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3211                         return false;
3212                 iph6 = ipv6_hdr(skb);
3213                 iph_to_flow_copy_v6addrs(fk, iph6);
3214                 noff += sizeof(*iph6);
3215                 proto = iph6->nexthdr;
3216         } else {
3217                 return false;
3218         }
3219         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3220                 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3221
3222         return true;
3223 }
3224
3225 /**
3226  * bond_xmit_hash - generate a hash value based on the xmit policy
3227  * @bond: bonding device
3228  * @skb: buffer to use for headers
3229  *
3230  * This function will extract the necessary headers from the skb buffer and use
3231  * them to generate a hash based on the xmit_policy set in the bonding device
3232  */
3233 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3234 {
3235         struct flow_keys flow;
3236         u32 hash;
3237
3238         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3239             skb->l4_hash)
3240                 return skb->hash;
3241
3242         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3243             !bond_flow_dissect(bond, skb, &flow))
3244                 return bond_eth_hash(skb);
3245
3246         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3247             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3248                 hash = bond_eth_hash(skb);
3249         else
3250                 hash = (__force u32)flow.ports.ports;
3251         hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3252                 (__force u32)flow_get_u32_src(&flow);
3253         hash ^= (hash >> 16);
3254         hash ^= (hash >> 8);
3255
3256         return hash;
3257 }
3258
3259 /*-------------------------- Device entry points ----------------------------*/
3260
3261 void bond_work_init_all(struct bonding *bond)
3262 {
3263         INIT_DELAYED_WORK(&bond->mcast_work,
3264                           bond_resend_igmp_join_requests_delayed);
3265         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3266         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3267         INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3268         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3269         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3270 }
3271
3272 static void bond_work_cancel_all(struct bonding *bond)
3273 {
3274         cancel_delayed_work_sync(&bond->mii_work);
3275         cancel_delayed_work_sync(&bond->arp_work);
3276         cancel_delayed_work_sync(&bond->alb_work);
3277         cancel_delayed_work_sync(&bond->ad_work);
3278         cancel_delayed_work_sync(&bond->mcast_work);
3279         cancel_delayed_work_sync(&bond->slave_arr_work);
3280 }
3281
3282 static int bond_open(struct net_device *bond_dev)
3283 {
3284         struct bonding *bond = netdev_priv(bond_dev);
3285         struct list_head *iter;
3286         struct slave *slave;
3287
3288         /* reset slave->backup and slave->inactive */
3289         if (bond_has_slaves(bond)) {
3290                 bond_for_each_slave(bond, slave, iter) {
3291                         if (bond_uses_primary(bond) &&
3292                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3293                                 bond_set_slave_inactive_flags(slave,
3294                                                               BOND_SLAVE_NOTIFY_NOW);
3295                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3296                                 bond_set_slave_active_flags(slave,
3297                                                             BOND_SLAVE_NOTIFY_NOW);
3298                         }
3299                 }
3300         }
3301
3302         if (bond_is_lb(bond)) {
3303                 /* bond_alb_initialize must be called before the timer
3304                  * is started.
3305                  */
3306                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3307                         return -ENOMEM;
3308                 if (bond->params.tlb_dynamic_lb)
3309                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3310         }
3311
3312         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3313                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3314
3315         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3316                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3317                 bond->recv_probe = bond_arp_rcv;
3318         }
3319
3320         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3321                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3322                 /* register to receive LACPDUs */
3323                 bond->recv_probe = bond_3ad_lacpdu_recv;
3324                 bond_3ad_initiate_agg_selection(bond, 1);
3325         }
3326
3327         if (bond_mode_uses_xmit_hash(bond))
3328                 bond_update_slave_arr(bond, NULL);
3329
3330         return 0;
3331 }
3332
3333 static int bond_close(struct net_device *bond_dev)
3334 {
3335         struct bonding *bond = netdev_priv(bond_dev);
3336
3337         bond_work_cancel_all(bond);
3338         bond->send_peer_notif = 0;
3339         if (bond_is_lb(bond))
3340                 bond_alb_deinitialize(bond);
3341         bond->recv_probe = NULL;
3342
3343         return 0;
3344 }
3345
3346 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3347  * that some drivers can provide 32bit values only.
3348  */
3349 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3350                             const struct rtnl_link_stats64 *_new,
3351                             const struct rtnl_link_stats64 *_old)
3352 {
3353         const u64 *new = (const u64 *)_new;
3354         const u64 *old = (const u64 *)_old;
3355         u64 *res = (u64 *)_res;
3356         int i;
3357
3358         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3359                 u64 nv = new[i];
3360                 u64 ov = old[i];
3361                 s64 delta = nv - ov;
3362
3363                 /* detects if this particular field is 32bit only */
3364                 if (((nv | ov) >> 32) == 0)
3365                         delta = (s64)(s32)((u32)nv - (u32)ov);
3366
3367                 /* filter anomalies, some drivers reset their stats
3368                  * at down/up events.
3369                  */
3370                 if (delta > 0)
3371                         res[i] += delta;
3372         }
3373 }
3374
3375 static void bond_get_stats(struct net_device *bond_dev,
3376                            struct rtnl_link_stats64 *stats)
3377 {
3378         struct bonding *bond = netdev_priv(bond_dev);
3379         struct rtnl_link_stats64 temp;
3380         struct list_head *iter;
3381         struct slave *slave;
3382
3383         spin_lock(&bond->stats_lock);
3384         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3385
3386         rcu_read_lock();
3387         bond_for_each_slave_rcu(bond, slave, iter) {
3388                 const struct rtnl_link_stats64 *new =
3389                         dev_get_stats(slave->dev, &temp);
3390
3391                 bond_fold_stats(stats, new, &slave->slave_stats);
3392
3393                 /* save off the slave stats for the next run */
3394                 memcpy(&slave->slave_stats, new, sizeof(*new));
3395         }
3396         rcu_read_unlock();
3397
3398         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3399         spin_unlock(&bond->stats_lock);
3400 }
3401
3402 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3403 {
3404         struct bonding *bond = netdev_priv(bond_dev);
3405         struct net_device *slave_dev = NULL;
3406         struct ifbond k_binfo;
3407         struct ifbond __user *u_binfo = NULL;
3408         struct ifslave k_sinfo;
3409         struct ifslave __user *u_sinfo = NULL;
3410         struct mii_ioctl_data *mii = NULL;
3411         struct bond_opt_value newval;
3412         struct net *net;
3413         int res = 0;
3414
3415         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3416
3417         switch (cmd) {
3418         case SIOCGMIIPHY:
3419                 mii = if_mii(ifr);
3420                 if (!mii)
3421                         return -EINVAL;
3422
3423                 mii->phy_id = 0;
3424                 /* Fall Through */
3425         case SIOCGMIIREG:
3426                 /* We do this again just in case we were called by SIOCGMIIREG
3427                  * instead of SIOCGMIIPHY.
3428                  */
3429                 mii = if_mii(ifr);
3430                 if (!mii)
3431                         return -EINVAL;
3432
3433                 if (mii->reg_num == 1) {
3434                         mii->val_out = 0;
3435                         if (netif_carrier_ok(bond->dev))
3436                                 mii->val_out = BMSR_LSTATUS;
3437                 }
3438
3439                 return 0;
3440         case BOND_INFO_QUERY_OLD:
3441         case SIOCBONDINFOQUERY:
3442                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3443
3444                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3445                         return -EFAULT;
3446
3447                 bond_info_query(bond_dev, &k_binfo);
3448                 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3449                         return -EFAULT;
3450
3451                 return 0;
3452         case BOND_SLAVE_INFO_QUERY_OLD:
3453         case SIOCBONDSLAVEINFOQUERY:
3454                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3455
3456                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3457                         return -EFAULT;
3458
3459                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3460                 if (res == 0 &&
3461                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3462                         return -EFAULT;
3463
3464                 return res;
3465         default:
3466                 break;
3467         }
3468
3469         net = dev_net(bond_dev);
3470
3471         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3472                 return -EPERM;
3473
3474         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3475
3476         netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3477
3478         if (!slave_dev)
3479                 return -ENODEV;
3480
3481         netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3482         switch (cmd) {
3483         case BOND_ENSLAVE_OLD:
3484         case SIOCBONDENSLAVE:
3485                 res = bond_enslave(bond_dev, slave_dev);
3486                 break;
3487         case BOND_RELEASE_OLD:
3488         case SIOCBONDRELEASE:
3489                 res = bond_release(bond_dev, slave_dev);
3490                 break;
3491         case BOND_SETHWADDR_OLD:
3492         case SIOCBONDSETHWADDR:
3493                 bond_set_dev_addr(bond_dev, slave_dev);
3494                 res = 0;
3495                 break;
3496         case BOND_CHANGE_ACTIVE_OLD:
3497         case SIOCBONDCHANGEACTIVE:
3498                 bond_opt_initstr(&newval, slave_dev->name);
3499                 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3500                                             &newval);
3501                 break;
3502         default:
3503                 res = -EOPNOTSUPP;
3504         }
3505
3506         return res;
3507 }
3508
3509 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3510 {
3511         struct bonding *bond = netdev_priv(bond_dev);
3512
3513         if (change & IFF_PROMISC)
3514                 bond_set_promiscuity(bond,
3515                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3516
3517         if (change & IFF_ALLMULTI)
3518                 bond_set_allmulti(bond,
3519                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3520 }
3521
3522 static void bond_set_rx_mode(struct net_device *bond_dev)
3523 {
3524         struct bonding *bond = netdev_priv(bond_dev);
3525         struct list_head *iter;
3526         struct slave *slave;
3527
3528         rcu_read_lock();
3529         if (bond_uses_primary(bond)) {
3530                 slave = rcu_dereference(bond->curr_active_slave);
3531                 if (slave) {
3532                         dev_uc_sync(slave->dev, bond_dev);
3533                         dev_mc_sync(slave->dev, bond_dev);
3534                 }
3535         } else {
3536                 bond_for_each_slave_rcu(bond, slave, iter) {
3537                         dev_uc_sync_multiple(slave->dev, bond_dev);
3538                         dev_mc_sync_multiple(slave->dev, bond_dev);
3539                 }
3540         }
3541         rcu_read_unlock();
3542 }
3543
3544 static int bond_neigh_init(struct neighbour *n)
3545 {
3546         struct bonding *bond = netdev_priv(n->dev);
3547         const struct net_device_ops *slave_ops;
3548         struct neigh_parms parms;
3549         struct slave *slave;
3550         int ret;
3551
3552         slave = bond_first_slave(bond);
3553         if (!slave)
3554                 return 0;
3555         slave_ops = slave->dev->netdev_ops;
3556         if (!slave_ops->ndo_neigh_setup)
3557                 return 0;
3558
3559         parms.neigh_setup = NULL;
3560         parms.neigh_cleanup = NULL;
3561         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3562         if (ret)
3563                 return ret;
3564
3565         /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3566          * after the last slave has been detached.  Assumes that all slaves
3567          * utilize the same neigh_cleanup (true at this writing as only user
3568          * is ipoib).
3569          */
3570         n->parms->neigh_cleanup = parms.neigh_cleanup;
3571
3572         if (!parms.neigh_setup)
3573                 return 0;
3574
3575         return parms.neigh_setup(n);
3576 }
3577
3578 /* The bonding ndo_neigh_setup is called at init time beofre any
3579  * slave exists. So we must declare proxy setup function which will
3580  * be used at run time to resolve the actual slave neigh param setup.
3581  *
3582  * It's also called by master devices (such as vlans) to setup their
3583  * underlying devices. In that case - do nothing, we're already set up from
3584  * our init.
3585  */
3586 static int bond_neigh_setup(struct net_device *dev,
3587                             struct neigh_parms *parms)
3588 {
3589         /* modify only our neigh_parms */
3590         if (parms->dev == dev)
3591                 parms->neigh_setup = bond_neigh_init;
3592
3593         return 0;
3594 }
3595
3596 /* Change the MTU of all of a master's slaves to match the master */
3597 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3598 {
3599         struct bonding *bond = netdev_priv(bond_dev);
3600         struct slave *slave, *rollback_slave;
3601         struct list_head *iter;
3602         int res = 0;
3603
3604         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3605
3606         bond_for_each_slave(bond, slave, iter) {
3607                 netdev_dbg(bond_dev, "s %p c_m %p\n",
3608                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3609
3610                 res = dev_set_mtu(slave->dev, new_mtu);
3611
3612                 if (res) {
3613                         /* If we failed to set the slave's mtu to the new value
3614                          * we must abort the operation even in ACTIVE_BACKUP
3615                          * mode, because if we allow the backup slaves to have
3616                          * different mtu values than the active slave we'll
3617                          * need to change their mtu when doing a failover. That
3618                          * means changing their mtu from timer context, which
3619                          * is probably not a good idea.
3620                          */
3621                         netdev_dbg(bond_dev, "err %d %s\n", res,
3622                                    slave->dev->name);
3623                         goto unwind;
3624                 }
3625         }
3626
3627         bond_dev->mtu = new_mtu;
3628
3629         return 0;
3630
3631 unwind:
3632         /* unwind from head to the slave that failed */
3633         bond_for_each_slave(bond, rollback_slave, iter) {
3634                 int tmp_res;
3635
3636                 if (rollback_slave == slave)
3637                         break;
3638
3639                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3640                 if (tmp_res) {
3641                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3642                                    tmp_res, rollback_slave->dev->name);
3643                 }
3644         }
3645
3646         return res;
3647 }
3648
3649 /* Change HW address
3650  *
3651  * Note that many devices must be down to change the HW address, and
3652  * downing the master releases all slaves.  We can make bonds full of
3653  * bonding devices to test this, however.
3654  */
3655 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3656 {
3657         struct bonding *bond = netdev_priv(bond_dev);
3658         struct slave *slave, *rollback_slave;
3659         struct sockaddr_storage *ss = addr, tmp_ss;
3660         struct list_head *iter;
3661         int res = 0;
3662
3663         if (BOND_MODE(bond) == BOND_MODE_ALB)
3664                 return bond_alb_set_mac_address(bond_dev, addr);
3665
3666
3667         netdev_dbg(bond_dev, "bond=%p\n", bond);
3668
3669         /* If fail_over_mac is enabled, do nothing and return success.
3670          * Returning an error causes ifenslave to fail.
3671          */
3672         if (bond->params.fail_over_mac &&
3673             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3674                 return 0;
3675
3676         if (!is_valid_ether_addr(ss->__data))
3677                 return -EADDRNOTAVAIL;
3678
3679         bond_for_each_slave(bond, slave, iter) {
3680                 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3681                 res = dev_set_mac_address(slave->dev, addr);
3682                 if (res) {
3683                         /* TODO: consider downing the slave
3684                          * and retry ?
3685                          * User should expect communications
3686                          * breakage anyway until ARP finish
3687                          * updating, so...
3688                          */
3689                         netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3690                         goto unwind;
3691                 }
3692         }
3693
3694         /* success */
3695         memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
3696         return 0;
3697
3698 unwind:
3699         memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
3700         tmp_ss.ss_family = bond_dev->type;
3701
3702         /* unwind from head to the slave that failed */
3703         bond_for_each_slave(bond, rollback_slave, iter) {
3704                 int tmp_res;
3705
3706                 if (rollback_slave == slave)
3707                         break;
3708
3709                 tmp_res = dev_set_mac_address(rollback_slave->dev,
3710                                               (struct sockaddr *)&tmp_ss);
3711                 if (tmp_res) {
3712                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3713                                    tmp_res, rollback_slave->dev->name);
3714                 }
3715         }
3716
3717         return res;
3718 }
3719
3720 /**
3721  * bond_xmit_slave_id - transmit skb through slave with slave_id
3722  * @bond: bonding device that is transmitting
3723  * @skb: buffer to transmit
3724  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3725  *
3726  * This function tries to transmit through slave with slave_id but in case
3727  * it fails, it tries to find the first available slave for transmission.
3728  * The skb is consumed in all cases, thus the function is void.
3729  */
3730 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3731 {
3732         struct list_head *iter;
3733         struct slave *slave;
3734         int i = slave_id;
3735
3736         /* Here we start from the slave with slave_id */
3737         bond_for_each_slave_rcu(bond, slave, iter) {
3738                 if (--i < 0) {
3739                         if (bond_slave_can_tx(slave)) {
3740                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3741                                 return;
3742                         }
3743                 }
3744         }
3745
3746         /* Here we start from the first slave up to slave_id */
3747         i = slave_id;
3748         bond_for_each_slave_rcu(bond, slave, iter) {
3749                 if (--i < 0)
3750                         break;
3751                 if (bond_slave_can_tx(slave)) {
3752                         bond_dev_queue_xmit(bond, skb, slave->dev);
3753                         return;
3754                 }
3755         }
3756         /* no slave that can tx has been found */
3757         bond_tx_drop(bond->dev, skb);
3758 }
3759
3760 /**
3761  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3762  * @bond: bonding device to use
3763  *
3764  * Based on the value of the bonding device's packets_per_slave parameter
3765  * this function generates a slave id, which is usually used as the next
3766  * slave to transmit through.
3767  */
3768 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3769 {
3770         u32 slave_id;
3771         struct reciprocal_value reciprocal_packets_per_slave;
3772         int packets_per_slave = bond->params.packets_per_slave;
3773
3774         switch (packets_per_slave) {
3775         case 0:
3776                 slave_id = prandom_u32();
3777                 break;
3778         case 1:
3779                 slave_id = bond->rr_tx_counter;
3780                 break;
3781         default:
3782                 reciprocal_packets_per_slave =
3783                         bond->params.reciprocal_packets_per_slave;
3784                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3785                                              reciprocal_packets_per_slave);
3786                 break;
3787         }
3788         bond->rr_tx_counter++;
3789
3790         return slave_id;
3791 }
3792
3793 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3794 {
3795         struct bonding *bond = netdev_priv(bond_dev);
3796         struct iphdr *iph = ip_hdr(skb);
3797         struct slave *slave;
3798         u32 slave_id;
3799
3800         /* Start with the curr_active_slave that joined the bond as the
3801          * default for sending IGMP traffic.  For failover purposes one
3802          * needs to maintain some consistency for the interface that will
3803          * send the join/membership reports.  The curr_active_slave found
3804          * will send all of this type of traffic.
3805          */
3806         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3807                 slave = rcu_dereference(bond->curr_active_slave);
3808                 if (slave)
3809                         bond_dev_queue_xmit(bond, skb, slave->dev);
3810                 else
3811                         bond_xmit_slave_id(bond, skb, 0);
3812         } else {
3813                 int slave_cnt = READ_ONCE(bond->slave_cnt);
3814
3815                 if (likely(slave_cnt)) {
3816                         slave_id = bond_rr_gen_slave_id(bond);
3817                         bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3818                 } else {
3819                         bond_tx_drop(bond_dev, skb);
3820                 }
3821         }
3822
3823         return NETDEV_TX_OK;
3824 }
3825
3826 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3827  * the bond has a usable interface.
3828  */
3829 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3830 {
3831         struct bonding *bond = netdev_priv(bond_dev);
3832         struct slave *slave;
3833
3834         slave = rcu_dereference(bond->curr_active_slave);
3835         if (slave)
3836                 bond_dev_queue_xmit(bond, skb, slave->dev);
3837         else
3838                 bond_tx_drop(bond_dev, skb);
3839
3840         return NETDEV_TX_OK;
3841 }
3842
3843 /* Use this to update slave_array when (a) it's not appropriate to update
3844  * slave_array right away (note that update_slave_array() may sleep)
3845  * and / or (b) RTNL is not held.
3846  */
3847 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3848 {
3849         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3850 }
3851
3852 /* Slave array work handler. Holds only RTNL */
3853 static void bond_slave_arr_handler(struct work_struct *work)
3854 {
3855         struct bonding *bond = container_of(work, struct bonding,
3856                                             slave_arr_work.work);
3857         int ret;
3858
3859         if (!rtnl_trylock())
3860                 goto err;
3861
3862         ret = bond_update_slave_arr(bond, NULL);
3863         rtnl_unlock();
3864         if (ret) {
3865                 pr_warn_ratelimited("Failed to update slave array from WT\n");
3866                 goto err;
3867         }
3868         return;
3869
3870 err:
3871         bond_slave_arr_work_rearm(bond, 1);
3872 }
3873
3874 /* Build the usable slaves array in control path for modes that use xmit-hash
3875  * to determine the slave interface -
3876  * (a) BOND_MODE_8023AD
3877  * (b) BOND_MODE_XOR
3878  * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3879  *
3880  * The caller is expected to hold RTNL only and NO other lock!
3881  */
3882 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3883 {
3884         struct slave *slave;
3885         struct list_head *iter;
3886         struct bond_up_slave *new_arr, *old_arr;
3887         int agg_id = 0;
3888         int ret = 0;
3889
3890 #ifdef CONFIG_LOCKDEP
3891         WARN_ON(lockdep_is_held(&bond->mode_lock));
3892 #endif
3893
3894         new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3895                           GFP_KERNEL);
3896         if (!new_arr) {
3897                 ret = -ENOMEM;
3898                 pr_err("Failed to build slave-array.\n");
3899                 goto out;
3900         }
3901         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3902                 struct ad_info ad_info;
3903
3904                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3905                         pr_debug("bond_3ad_get_active_agg_info failed\n");
3906                         kfree_rcu(new_arr, rcu);
3907                         /* No active aggragator means it's not safe to use
3908                          * the previous array.
3909                          */
3910                         old_arr = rtnl_dereference(bond->slave_arr);
3911                         if (old_arr) {
3912                                 RCU_INIT_POINTER(bond->slave_arr, NULL);
3913                                 kfree_rcu(old_arr, rcu);
3914                         }
3915                         goto out;
3916                 }
3917                 agg_id = ad_info.aggregator_id;
3918         }
3919         bond_for_each_slave(bond, slave, iter) {
3920                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3921                         struct aggregator *agg;
3922
3923                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
3924                         if (!agg || agg->aggregator_identifier != agg_id)
3925                                 continue;
3926                 }
3927                 if (!bond_slave_can_tx(slave))
3928                         continue;
3929                 if (skipslave == slave)
3930                         continue;
3931                 new_arr->arr[new_arr->count++] = slave;
3932         }
3933
3934         old_arr = rtnl_dereference(bond->slave_arr);
3935         rcu_assign_pointer(bond->slave_arr, new_arr);
3936         if (old_arr)
3937                 kfree_rcu(old_arr, rcu);
3938 out:
3939         if (ret != 0 && skipslave) {
3940                 int idx;
3941
3942                 /* Rare situation where caller has asked to skip a specific
3943                  * slave but allocation failed (most likely!). BTW this is
3944                  * only possible when the call is initiated from
3945                  * __bond_release_one(). In this situation; overwrite the
3946                  * skipslave entry in the array with the last entry from the
3947                  * array to avoid a situation where the xmit path may choose
3948                  * this to-be-skipped slave to send a packet out.
3949                  */
3950                 old_arr = rtnl_dereference(bond->slave_arr);
3951                 for (idx = 0; idx < old_arr->count; idx++) {
3952                         if (skipslave == old_arr->arr[idx]) {
3953                                 old_arr->arr[idx] =
3954                                     old_arr->arr[old_arr->count-1];
3955                                 old_arr->count--;
3956                                 break;
3957                         }
3958                 }
3959         }
3960         return ret;
3961 }
3962
3963 /* Use this Xmit function for 3AD as well as XOR modes. The current
3964  * usable slave array is formed in the control path. The xmit function
3965  * just calculates hash and sends the packet out.
3966  */
3967 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3968 {
3969         struct bonding *bond = netdev_priv(dev);
3970         struct slave *slave;
3971         struct bond_up_slave *slaves;
3972         unsigned int count;
3973
3974         slaves = rcu_dereference(bond->slave_arr);
3975         count = slaves ? READ_ONCE(slaves->count) : 0;
3976         if (likely(count)) {
3977                 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3978                 bond_dev_queue_xmit(bond, skb, slave->dev);
3979         } else {
3980                 bond_tx_drop(dev, skb);
3981         }
3982
3983         return NETDEV_TX_OK;
3984 }
3985
3986 /* in broadcast mode, we send everything to all usable interfaces. */
3987 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3988 {
3989         struct bonding *bond = netdev_priv(bond_dev);
3990         struct slave *slave = NULL;
3991         struct list_head *iter;
3992
3993         bond_for_each_slave_rcu(bond, slave, iter) {
3994                 if (bond_is_last_slave(bond, slave))
3995                         break;
3996                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3997                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3998
3999                         if (!skb2) {
4000                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4001                                                     bond_dev->name, __func__);
4002                                 continue;
4003                         }
4004                         bond_dev_queue_xmit(bond, skb2, slave->dev);
4005                 }
4006         }
4007         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4008                 bond_dev_queue_xmit(bond, skb, slave->dev);
4009         else
4010                 bond_tx_drop(bond_dev, skb);
4011
4012         return NETDEV_TX_OK;
4013 }
4014
4015 /*------------------------- Device initialization ---------------------------*/
4016
4017 /* Lookup the slave that corresponds to a qid */
4018 static inline int bond_slave_override(struct bonding *bond,
4019                                       struct sk_buff *skb)
4020 {
4021         struct slave *slave = NULL;
4022         struct list_head *iter;
4023
4024         if (!skb->queue_mapping)
4025                 return 1;
4026
4027         /* Find out if any slaves have the same mapping as this skb. */
4028         bond_for_each_slave_rcu(bond, slave, iter) {
4029                 if (slave->queue_id == skb->queue_mapping) {
4030                         if (bond_slave_is_up(slave) &&
4031                             slave->link == BOND_LINK_UP) {
4032                                 bond_dev_queue_xmit(bond, skb, slave->dev);
4033                                 return 0;
4034                         }
4035                         /* If the slave isn't UP, use default transmit policy. */
4036                         break;
4037                 }
4038         }
4039
4040         return 1;
4041 }
4042
4043
4044 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4045                              void *accel_priv, select_queue_fallback_t fallback)
4046 {
4047         /* This helper function exists to help dev_pick_tx get the correct
4048          * destination queue.  Using a helper function skips a call to
4049          * skb_tx_hash and will put the skbs in the queue we expect on their
4050          * way down to the bonding driver.
4051          */
4052         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4053
4054         /* Save the original txq to restore before passing to the driver */
4055         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4056
4057         if (unlikely(txq >= dev->real_num_tx_queues)) {
4058                 do {
4059                         txq -= dev->real_num_tx_queues;
4060                 } while (txq >= dev->real_num_tx_queues);
4061         }
4062         return txq;
4063 }
4064
4065 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4066 {
4067         struct bonding *bond = netdev_priv(dev);
4068
4069         if (bond_should_override_tx_queue(bond) &&
4070             !bond_slave_override(bond, skb))
4071                 return NETDEV_TX_OK;
4072
4073         switch (BOND_MODE(bond)) {
4074         case BOND_MODE_ROUNDROBIN:
4075                 return bond_xmit_roundrobin(skb, dev);
4076         case BOND_MODE_ACTIVEBACKUP:
4077                 return bond_xmit_activebackup(skb, dev);
4078         case BOND_MODE_8023AD:
4079         case BOND_MODE_XOR:
4080                 return bond_3ad_xor_xmit(skb, dev);
4081         case BOND_MODE_BROADCAST:
4082                 return bond_xmit_broadcast(skb, dev);
4083         case BOND_MODE_ALB:
4084                 return bond_alb_xmit(skb, dev);
4085         case BOND_MODE_TLB:
4086                 return bond_tlb_xmit(skb, dev);
4087         default:
4088                 /* Should never happen, mode already checked */
4089                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4090                 WARN_ON_ONCE(1);
4091                 bond_tx_drop(dev, skb);
4092                 return NETDEV_TX_OK;
4093         }
4094 }
4095
4096 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4097 {
4098         struct bonding *bond = netdev_priv(dev);
4099         netdev_tx_t ret = NETDEV_TX_OK;
4100
4101         /* If we risk deadlock from transmitting this in the
4102          * netpoll path, tell netpoll to queue the frame for later tx
4103          */
4104         if (unlikely(is_netpoll_tx_blocked(dev)))
4105                 return NETDEV_TX_BUSY;
4106
4107         rcu_read_lock();
4108         if (bond_has_slaves(bond))
4109                 ret = __bond_start_xmit(skb, dev);
4110         else
4111                 bond_tx_drop(dev, skb);
4112         rcu_read_unlock();
4113
4114         return ret;
4115 }
4116
4117 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4118                                            struct ethtool_link_ksettings *cmd)
4119 {
4120         struct bonding *bond = netdev_priv(bond_dev);
4121         unsigned long speed = 0;
4122         struct list_head *iter;
4123         struct slave *slave;
4124
4125         cmd->base.duplex = DUPLEX_UNKNOWN;
4126         cmd->base.port = PORT_OTHER;
4127
4128         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4129          * do not need to check mode.  Though link speed might not represent
4130          * the true receive or transmit bandwidth (not all modes are symmetric)
4131          * this is an accurate maximum.
4132          */
4133         bond_for_each_slave(bond, slave, iter) {
4134                 if (bond_slave_can_tx(slave)) {
4135                         if (slave->speed != SPEED_UNKNOWN)
4136                                 speed += slave->speed;
4137                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4138                             slave->duplex != DUPLEX_UNKNOWN)
4139                                 cmd->base.duplex = slave->duplex;
4140                 }
4141         }
4142         cmd->base.speed = speed ? : SPEED_UNKNOWN;
4143
4144         return 0;
4145 }
4146
4147 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4148                                      struct ethtool_drvinfo *drvinfo)
4149 {
4150         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4151         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4152         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4153                  BOND_ABI_VERSION);
4154 }
4155
4156 static const struct ethtool_ops bond_ethtool_ops = {
4157         .get_drvinfo            = bond_ethtool_get_drvinfo,
4158         .get_link               = ethtool_op_get_link,
4159         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4160 };
4161
4162 static const struct net_device_ops bond_netdev_ops = {
4163         .ndo_init               = bond_init,
4164         .ndo_uninit             = bond_uninit,
4165         .ndo_open               = bond_open,
4166         .ndo_stop               = bond_close,
4167         .ndo_start_xmit         = bond_start_xmit,
4168         .ndo_select_queue       = bond_select_queue,
4169         .ndo_get_stats64        = bond_get_stats,
4170         .ndo_do_ioctl           = bond_do_ioctl,
4171         .ndo_change_rx_flags    = bond_change_rx_flags,
4172         .ndo_set_rx_mode        = bond_set_rx_mode,
4173         .ndo_change_mtu         = bond_change_mtu,
4174         .ndo_set_mac_address    = bond_set_mac_address,
4175         .ndo_neigh_setup        = bond_neigh_setup,
4176         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4177         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4178 #ifdef CONFIG_NET_POLL_CONTROLLER
4179         .ndo_netpoll_setup      = bond_netpoll_setup,
4180         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4181         .ndo_poll_controller    = bond_poll_controller,
4182 #endif
4183         .ndo_add_slave          = bond_enslave,
4184         .ndo_del_slave          = bond_release,
4185         .ndo_fix_features       = bond_fix_features,
4186         .ndo_features_check     = passthru_features_check,
4187 };
4188
4189 static const struct device_type bond_type = {
4190         .name = "bond",
4191 };
4192
4193 static void bond_destructor(struct net_device *bond_dev)
4194 {
4195         struct bonding *bond = netdev_priv(bond_dev);
4196         if (bond->wq)
4197                 destroy_workqueue(bond->wq);
4198 }
4199
4200 void bond_setup(struct net_device *bond_dev)
4201 {
4202         struct bonding *bond = netdev_priv(bond_dev);
4203
4204         spin_lock_init(&bond->mode_lock);
4205         spin_lock_init(&bond->stats_lock);
4206         bond->params = bonding_defaults;
4207
4208         /* Initialize pointers */
4209         bond->dev = bond_dev;
4210
4211         /* Initialize the device entry points */
4212         ether_setup(bond_dev);
4213         bond_dev->max_mtu = ETH_MAX_MTU;
4214         bond_dev->netdev_ops = &bond_netdev_ops;
4215         bond_dev->ethtool_ops = &bond_ethtool_ops;
4216
4217         bond_dev->needs_free_netdev = true;
4218         bond_dev->priv_destructor = bond_destructor;
4219
4220         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4221
4222         /* Initialize the device options */
4223         bond_dev->flags |= IFF_MASTER;
4224         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4225         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4226
4227         /* don't acquire bond device's netif_tx_lock when transmitting */
4228         bond_dev->features |= NETIF_F_LLTX;
4229
4230         /* By default, we declare the bond to be fully
4231          * VLAN hardware accelerated capable. Special
4232          * care is taken in the various xmit functions
4233          * when there are slaves that are not hw accel
4234          * capable
4235          */
4236
4237         /* Don't allow bond devices to change network namespaces. */
4238         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4239
4240         bond_dev->hw_features = BOND_VLAN_FEATURES |
4241                                 NETIF_F_HW_VLAN_CTAG_TX |
4242                                 NETIF_F_HW_VLAN_CTAG_RX |
4243                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4244
4245         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4246         bond_dev->features |= bond_dev->hw_features;
4247 }
4248
4249 /* Destroy a bonding device.
4250  * Must be under rtnl_lock when this function is called.
4251  */
4252 static void bond_uninit(struct net_device *bond_dev)
4253 {
4254         struct bonding *bond = netdev_priv(bond_dev);
4255         struct list_head *iter;
4256         struct slave *slave;
4257         struct bond_up_slave *arr;
4258
4259         bond_netpoll_cleanup(bond_dev);
4260
4261         /* Release the bonded slaves */
4262         bond_for_each_slave(bond, slave, iter)
4263                 __bond_release_one(bond_dev, slave->dev, true, true);
4264         netdev_info(bond_dev, "Released all slaves\n");
4265
4266         arr = rtnl_dereference(bond->slave_arr);
4267         if (arr) {
4268                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4269                 kfree_rcu(arr, rcu);
4270         }
4271
4272         list_del(&bond->bond_list);
4273
4274         bond_debug_unregister(bond);
4275 }
4276
4277 /*------------------------- Module initialization ---------------------------*/
4278
4279 static int bond_check_params(struct bond_params *params)
4280 {
4281         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4282         struct bond_opt_value newval;
4283         const struct bond_opt_value *valptr;
4284         int arp_all_targets_value = 0;
4285         u16 ad_actor_sys_prio = 0;
4286         u16 ad_user_port_key = 0;
4287         __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4288         int arp_ip_count;
4289         int bond_mode   = BOND_MODE_ROUNDROBIN;
4290         int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4291         int lacp_fast = 0;
4292         int tlb_dynamic_lb;
4293
4294         /* Convert string parameters. */
4295         if (mode) {
4296                 bond_opt_initstr(&newval, mode);
4297                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4298                 if (!valptr) {
4299                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4300                         return -EINVAL;
4301                 }
4302                 bond_mode = valptr->value;
4303         }
4304
4305         if (xmit_hash_policy) {
4306                 if ((bond_mode != BOND_MODE_XOR) &&
4307                     (bond_mode != BOND_MODE_8023AD) &&
4308                     (bond_mode != BOND_MODE_TLB)) {
4309                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4310                                 bond_mode_name(bond_mode));
4311                 } else {
4312                         bond_opt_initstr(&newval, xmit_hash_policy);
4313                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4314                                                 &newval);
4315                         if (!valptr) {
4316                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4317                                        xmit_hash_policy);
4318                                 return -EINVAL;
4319                         }
4320                         xmit_hashtype = valptr->value;
4321                 }
4322         }
4323
4324         if (lacp_rate) {
4325                 if (bond_mode != BOND_MODE_8023AD) {
4326                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4327                                 bond_mode_name(bond_mode));
4328                 } else {
4329                         bond_opt_initstr(&newval, lacp_rate);
4330                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4331                                                 &newval);
4332                         if (!valptr) {
4333                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4334                                        lacp_rate);
4335                                 return -EINVAL;
4336                         }
4337                         lacp_fast = valptr->value;
4338                 }
4339         }
4340
4341         if (ad_select) {
4342                 bond_opt_initstr(&newval, ad_select);
4343                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4344                                         &newval);
4345                 if (!valptr) {
4346                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4347                         return -EINVAL;
4348                 }
4349                 params->ad_select = valptr->value;
4350                 if (bond_mode != BOND_MODE_8023AD)
4351                         pr_warn("ad_select param only affects 802.3ad mode\n");
4352         } else {
4353                 params->ad_select = BOND_AD_STABLE;
4354         }
4355
4356         if (max_bonds < 0) {
4357                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4358                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4359                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4360         }
4361
4362         if (miimon < 0) {
4363                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4364                         miimon, INT_MAX);
4365                 miimon = 0;
4366         }
4367
4368         if (updelay < 0) {
4369                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4370                         updelay, INT_MAX);
4371                 updelay = 0;
4372         }
4373
4374         if (downdelay < 0) {
4375                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4376                         downdelay, INT_MAX);
4377                 downdelay = 0;
4378         }
4379
4380         if ((use_carrier != 0) && (use_carrier != 1)) {
4381                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4382                         use_carrier);
4383                 use_carrier = 1;
4384         }
4385
4386         if (num_peer_notif < 0 || num_peer_notif > 255) {
4387                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4388                         num_peer_notif);
4389                 num_peer_notif = 1;
4390         }
4391
4392         /* reset values for 802.3ad/TLB/ALB */
4393         if (!bond_mode_uses_arp(bond_mode)) {
4394                 if (!miimon) {
4395                         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");
4396                         pr_warn("Forcing miimon to 100msec\n");
4397                         miimon = BOND_DEFAULT_MIIMON;
4398                 }
4399         }
4400
4401         if (tx_queues < 1 || tx_queues > 255) {
4402                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4403                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4404                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4405         }
4406
4407         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4408                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4409                         all_slaves_active);
4410                 all_slaves_active = 0;
4411         }
4412
4413         if (resend_igmp < 0 || resend_igmp > 255) {
4414                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4415                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4416                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4417         }
4418
4419         bond_opt_initval(&newval, packets_per_slave);
4420         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4421                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4422                         packets_per_slave, USHRT_MAX);
4423                 packets_per_slave = 1;
4424         }
4425
4426         if (bond_mode == BOND_MODE_ALB) {
4427                 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",
4428                           updelay);
4429         }
4430
4431         if (!miimon) {
4432                 if (updelay || downdelay) {
4433                         /* just warn the user the up/down delay will have
4434                          * no effect since miimon is zero...
4435                          */
4436                         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",
4437                                 updelay, downdelay);
4438                 }
4439         } else {
4440                 /* don't allow arp monitoring */
4441                 if (arp_interval) {
4442                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4443                                 miimon, arp_interval);
4444                         arp_interval = 0;
4445                 }
4446
4447                 if ((updelay % miimon) != 0) {
4448                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4449                                 updelay, miimon, (updelay / miimon) * miimon);
4450                 }
4451
4452                 updelay /= miimon;
4453
4454                 if ((downdelay % miimon) != 0) {
4455                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4456                                 downdelay, miimon,
4457                                 (downdelay / miimon) * miimon);
4458                 }
4459
4460                 downdelay /= miimon;
4461         }
4462
4463         if (arp_interval < 0) {
4464                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4465                         arp_interval, INT_MAX);
4466                 arp_interval = 0;
4467         }
4468
4469         for (arp_ip_count = 0, i = 0;
4470              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4471                 __be32 ip;
4472
4473                 /* not a complete check, but good enough to catch mistakes */
4474                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4475                     !bond_is_ip_target_ok(ip)) {
4476                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4477                                 arp_ip_target[i]);
4478                         arp_interval = 0;
4479                 } else {
4480                         if (bond_get_targets_ip(arp_target, ip) == -1)
4481                                 arp_target[arp_ip_count++] = ip;
4482                         else
4483                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4484                                         &ip);
4485                 }
4486         }
4487
4488         if (arp_interval && !arp_ip_count) {
4489                 /* don't allow arping if no arp_ip_target given... */
4490                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4491                         arp_interval);
4492                 arp_interval = 0;
4493         }
4494
4495         if (arp_validate) {
4496                 if (!arp_interval) {
4497                         pr_err("arp_validate requires arp_interval\n");
4498                         return -EINVAL;
4499                 }
4500
4501                 bond_opt_initstr(&newval, arp_validate);
4502                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4503                                         &newval);
4504                 if (!valptr) {
4505                         pr_err("Error: invalid arp_validate \"%s\"\n",
4506                                arp_validate);
4507                         return -EINVAL;
4508                 }
4509                 arp_validate_value = valptr->value;
4510         } else {
4511                 arp_validate_value = 0;
4512         }
4513
4514         if (arp_all_targets) {
4515                 bond_opt_initstr(&newval, arp_all_targets);
4516                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4517                                         &newval);
4518                 if (!valptr) {
4519                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4520                                arp_all_targets);
4521                         arp_all_targets_value = 0;
4522                 } else {
4523                         arp_all_targets_value = valptr->value;
4524                 }
4525         }
4526
4527         if (miimon) {
4528                 pr_info("MII link monitoring set to %d ms\n", miimon);
4529         } else if (arp_interval) {
4530                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4531                                           arp_validate_value);
4532                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4533                         arp_interval, valptr->string, arp_ip_count);
4534
4535                 for (i = 0; i < arp_ip_count; i++)
4536                         pr_cont(" %s", arp_ip_target[i]);
4537
4538                 pr_cont("\n");
4539
4540         } else if (max_bonds) {
4541                 /* miimon and arp_interval not set, we need one so things
4542                  * work as expected, see bonding.txt for details
4543                  */
4544                 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");
4545         }
4546
4547         if (primary && !bond_mode_uses_primary(bond_mode)) {
4548                 /* currently, using a primary only makes sense
4549                  * in active backup, TLB or ALB modes
4550                  */
4551                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4552                         primary, bond_mode_name(bond_mode));
4553                 primary = NULL;
4554         }
4555
4556         if (primary && primary_reselect) {
4557                 bond_opt_initstr(&newval, primary_reselect);
4558                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4559                                         &newval);
4560                 if (!valptr) {
4561                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4562                                primary_reselect);
4563                         return -EINVAL;
4564                 }
4565                 primary_reselect_value = valptr->value;
4566         } else {
4567                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4568         }
4569
4570         if (fail_over_mac) {
4571                 bond_opt_initstr(&newval, fail_over_mac);
4572                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4573                                         &newval);
4574                 if (!valptr) {
4575                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4576                                fail_over_mac);
4577                         return -EINVAL;
4578                 }
4579                 fail_over_mac_value = valptr->value;
4580                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4581                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4582         } else {
4583                 fail_over_mac_value = BOND_FOM_NONE;
4584         }
4585
4586         bond_opt_initstr(&newval, "default");
4587         valptr = bond_opt_parse(
4588                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4589                                      &newval);
4590         if (!valptr) {
4591                 pr_err("Error: No ad_actor_sys_prio default value");
4592                 return -EINVAL;
4593         }
4594         ad_actor_sys_prio = valptr->value;
4595
4596         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4597                                 &newval);
4598         if (!valptr) {
4599                 pr_err("Error: No ad_user_port_key default value");
4600                 return -EINVAL;
4601         }
4602         ad_user_port_key = valptr->value;
4603
4604         bond_opt_initstr(&newval, "default");
4605         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
4606         if (!valptr) {
4607                 pr_err("Error: No tlb_dynamic_lb default value");
4608                 return -EINVAL;
4609         }
4610         tlb_dynamic_lb = valptr->value;
4611
4612         if (lp_interval == 0) {
4613                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4614                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4615                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4616         }
4617
4618         /* fill params struct with the proper values */
4619         params->mode = bond_mode;
4620         params->xmit_policy = xmit_hashtype;
4621         params->miimon = miimon;
4622         params->num_peer_notif = num_peer_notif;
4623         params->arp_interval = arp_interval;
4624         params->arp_validate = arp_validate_value;
4625         params->arp_all_targets = arp_all_targets_value;
4626         params->updelay = updelay;
4627         params->downdelay = downdelay;
4628         params->use_carrier = use_carrier;
4629         params->lacp_fast = lacp_fast;
4630         params->primary[0] = 0;
4631         params->primary_reselect = primary_reselect_value;
4632         params->fail_over_mac = fail_over_mac_value;
4633         params->tx_queues = tx_queues;
4634         params->all_slaves_active = all_slaves_active;
4635         params->resend_igmp = resend_igmp;
4636         params->min_links = min_links;
4637         params->lp_interval = lp_interval;
4638         params->packets_per_slave = packets_per_slave;
4639         params->tlb_dynamic_lb = tlb_dynamic_lb;
4640         params->ad_actor_sys_prio = ad_actor_sys_prio;
4641         eth_zero_addr(params->ad_actor_system);
4642         params->ad_user_port_key = ad_user_port_key;
4643         if (packets_per_slave > 0) {
4644                 params->reciprocal_packets_per_slave =
4645                         reciprocal_value(packets_per_slave);
4646         } else {
4647                 /* reciprocal_packets_per_slave is unused if
4648                  * packets_per_slave is 0 or 1, just initialize it
4649                  */
4650                 params->reciprocal_packets_per_slave =
4651                         (struct reciprocal_value) { 0 };
4652         }
4653
4654         if (primary) {
4655                 strncpy(params->primary, primary, IFNAMSIZ);
4656                 params->primary[IFNAMSIZ - 1] = 0;
4657         }
4658
4659         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4660
4661         return 0;
4662 }
4663
4664 /* Called from registration process */
4665 static int bond_init(struct net_device *bond_dev)
4666 {
4667         struct bonding *bond = netdev_priv(bond_dev);
4668         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4669
4670         netdev_dbg(bond_dev, "Begin bond_init\n");
4671
4672         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4673         if (!bond->wq)
4674                 return -ENOMEM;
4675
4676         netdev_lockdep_set_classes(bond_dev);
4677
4678         list_add_tail(&bond->bond_list, &bn->dev_list);
4679
4680         bond_prepare_sysfs_group(bond);
4681
4682         bond_debug_register(bond);
4683
4684         /* Ensure valid dev_addr */
4685         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4686             bond_dev->addr_assign_type == NET_ADDR_PERM)
4687                 eth_hw_addr_random(bond_dev);
4688
4689         return 0;
4690 }
4691
4692 unsigned int bond_get_num_tx_queues(void)
4693 {
4694         return tx_queues;
4695 }
4696
4697 /* Create a new bond based on the specified name and bonding parameters.
4698  * If name is NULL, obtain a suitable "bond%d" name for us.
4699  * Caller must NOT hold rtnl_lock; we need to release it here before we
4700  * set up our sysfs entries.
4701  */
4702 int bond_create(struct net *net, const char *name)
4703 {
4704         struct net_device *bond_dev;
4705         struct bonding *bond;
4706         struct alb_bond_info *bond_info;
4707         int res;
4708
4709         rtnl_lock();
4710
4711         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4712                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4713                                    bond_setup, tx_queues);
4714         if (!bond_dev) {
4715                 pr_err("%s: eek! can't alloc netdev!\n", name);
4716                 rtnl_unlock();
4717                 return -ENOMEM;
4718         }
4719
4720         /*
4721          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4722          * It is set to 0 by default which is wrong.
4723          */
4724         bond = netdev_priv(bond_dev);
4725         bond_info = &(BOND_ALB_INFO(bond));
4726         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4727
4728         dev_net_set(bond_dev, net);
4729         bond_dev->rtnl_link_ops = &bond_link_ops;
4730
4731         res = register_netdevice(bond_dev);
4732
4733         netif_carrier_off(bond_dev);
4734
4735         bond_work_init_all(bond);
4736
4737         rtnl_unlock();
4738         if (res < 0)
4739                 free_netdev(bond_dev);
4740         return res;
4741 }
4742
4743 static int __net_init bond_net_init(struct net *net)
4744 {
4745         struct bond_net *bn = net_generic(net, bond_net_id);
4746
4747         bn->net = net;
4748         INIT_LIST_HEAD(&bn->dev_list);
4749
4750         bond_create_proc_dir(bn);
4751         bond_create_sysfs(bn);
4752
4753         return 0;
4754 }
4755
4756 static void __net_exit bond_net_exit(struct net *net)
4757 {
4758         struct bond_net *bn = net_generic(net, bond_net_id);
4759         struct bonding *bond, *tmp_bond;
4760         LIST_HEAD(list);
4761
4762         bond_destroy_sysfs(bn);
4763
4764         /* Kill off any bonds created after unregistering bond rtnl ops */
4765         rtnl_lock();
4766         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4767                 unregister_netdevice_queue(bond->dev, &list);
4768         unregister_netdevice_many(&list);
4769         rtnl_unlock();
4770
4771         bond_destroy_proc_dir(bn);
4772 }
4773
4774 static struct pernet_operations bond_net_ops = {
4775         .init = bond_net_init,
4776         .exit = bond_net_exit,
4777         .id   = &bond_net_id,
4778         .size = sizeof(struct bond_net),
4779 };
4780
4781 static int __init bonding_init(void)
4782 {
4783         int i;
4784         int res;
4785
4786         pr_info("%s", bond_version);
4787
4788         res = bond_check_params(&bonding_defaults);
4789         if (res)
4790                 goto out;
4791
4792         res = register_pernet_subsys(&bond_net_ops);
4793         if (res)
4794                 goto out;
4795
4796         res = bond_netlink_init();
4797         if (res)
4798                 goto err_link;
4799
4800         bond_create_debugfs();
4801
4802         for (i = 0; i < max_bonds; i++) {
4803                 res = bond_create(&init_net, NULL);
4804                 if (res)
4805                         goto err;
4806         }
4807
4808         register_netdevice_notifier(&bond_netdev_notifier);
4809 out:
4810         return res;
4811 err:
4812         bond_destroy_debugfs();
4813         bond_netlink_fini();
4814 err_link:
4815         unregister_pernet_subsys(&bond_net_ops);
4816         goto out;
4817
4818 }
4819
4820 static void __exit bonding_exit(void)
4821 {
4822         unregister_netdevice_notifier(&bond_netdev_notifier);
4823
4824         bond_destroy_debugfs();
4825
4826         bond_netlink_fini();
4827         unregister_pernet_subsys(&bond_net_ops);
4828
4829 #ifdef CONFIG_NET_POLL_CONTROLLER
4830         /* Make sure we don't have an imbalance on our netpoll blocking */
4831         WARN_ON(atomic_read(&netpoll_block_tx));
4832 #endif
4833 }
4834
4835 module_init(bonding_init);
4836 module_exit(bonding_exit);
4837 MODULE_LICENSE("GPL");
4838 MODULE_VERSION(DRV_VERSION);
4839 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4840 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");