drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/fcntl.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/ioport.h>
  41 #include <linux/in.h>
  42 #include <net/ip.h>
  43 #include <linux/ip.h>
  44 #include <linux/tcp.h>
  45 #include <linux/udp.h>
  46 #include <linux/slab.h>
  47 #include <linux/string.h>
  48 #include <linux/init.h>
  49 #include <linux/timer.h>
  50 #include <linux/socket.h>
  51 #include <linux/ctype.h>
  52 #include <linux/inet.h>
  53 #include <linux/bitops.h>
  54 #include <linux/io.h>
  55 #include <asm/dma.h>
  56 #include <linux/uaccess.h>
  57 #include <linux/errno.h>
  58 #include <linux/netdevice.h>
  59 #include <linux/inetdevice.h>
  60 #include <linux/igmp.h>
  61 #include <linux/etherdevice.h>
  62 #include <linux/skbuff.h>
  63 #include <net/sock.h>
  64 #include <linux/rtnetlink.h>
  65 #include <linux/smp.h>
  66 #include <linux/if_ether.h>
  67 #include <net/arp.h>
  68 #include <linux/mii.h>
  69 #include <linux/ethtool.h>
  70 #include <linux/if_vlan.h>
  71 #include <linux/if_bonding.h>
  72 #include <linux/jiffies.h>
  73 #include <linux/preempt.h>
  74 #include <net/route.h>
  75 #include <net/net_namespace.h>
  76 #include <net/netns/generic.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/rculist.h>
  79 #include <net/flow_dissector.h>
  80 #include <net/bonding.h>
  81 #include <net/bond_3ad.h>
  82 #include <net/bond_alb.h>
  83
  84 #include "bonding_priv.h"
  85
  86 /*---------------------------- Module parameters ----------------------------*/
  87
  88 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  89
  90 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  91 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  92 static int num_peer_notif = 1;
  93 static int miimon;
  94 static int updelay;
  95 static int downdelay;
  96 static int use_carrier  = 1;
  97 static char *mode;
  98 static char *primary;
  99 static char *primary_reselect;
 100 static char *lacp_rate;
 101 static int min_links;
 102 static char *ad_select;
 103 static char *xmit_hash_policy;
 104 static int arp_interval;
 105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 106 static char *arp_validate;
 107 static char *arp_all_targets;
 108 static char *fail_over_mac;
 109 static int all_slaves_active;
 110 static struct bond_params bonding_defaults;
 111 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 112 static int packets_per_slave = 1;
 113 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 114
 115 module_param(max_bonds, int, 0);
 116 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 117 module_param(tx_queues, int, 0);
 118 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 119 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 120 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 121                                "failover event (alias of num_unsol_na)");
 122 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 123 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 124                                "failover event (alias of num_grat_arp)");
 125 module_param(miimon, int, 0);
 126 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 127 module_param(updelay, int, 0);
 128 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 129 module_param(downdelay, int, 0);
 130 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 131                             "in milliseconds");
 132 module_param(use_carrier, int, 0);
 133 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 134                               "0 for off, 1 for on (default)");
 135 module_param(mode, charp, 0);
 136 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 137                        "1 for active-backup, 2 for balance-xor, "
 138                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 139                        "6 for balance-alb");
 140 module_param(primary, charp, 0);
 141 MODULE_PARM_DESC(primary, "Primary network device to use");
 142 module_param(primary_reselect, charp, 0);
 143 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 144                                    "once it comes up; "
 145                                    "0 for always (default), "
 146                                    "1 for only if speed of primary is "
 147                                    "better, "
 148                                    "2 for only on active slave "
 149                                    "failure");
 150 module_param(lacp_rate, charp, 0);
 151 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 152                             "0 for slow, 1 for fast");
 153 module_param(ad_select, charp, 0);
 154 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 155                             "0 for stable (default), 1 for bandwidth, "
 156                             "2 for count");
 157 module_param(min_links, int, 0);
 158 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 159
 160 module_param(xmit_hash_policy, charp, 0);
 161 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
 162                                    "0 for layer 2 (default), 1 for layer 3+4, "
 163                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 164                                    "4 for encap layer 3+4");
 165 module_param(arp_interval, int, 0);
 166 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 167 module_param_array(arp_ip_target, charp, NULL, 0);
 168 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 169 module_param(arp_validate, charp, 0);
 170 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 171                                "0 for none (default), 1 for active, "
 172                                "2 for backup, 3 for all");
 173 module_param(arp_all_targets, charp, 0);
 174 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 175 module_param(fail_over_mac, charp, 0);
 176 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 177                                 "the same MAC; 0 for none (default), "
 178                                 "1 for active, 2 for follow");
 179 module_param(all_slaves_active, int, 0);
 180 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 181                                      "by setting active flag for all slaves; "
 182                                      "0 for never (default), 1 for always.");
 183 module_param(resend_igmp, int, 0);
 184 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 185                               "link failure");
 186 module_param(packets_per_slave, int, 0);
 187 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 188                                     "mode; 0 for a random slave, 1 packet per "
 189                                     "slave (default), >1 packets per slave.");
 190 module_param(lp_interval, uint, 0);
 191 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 192                               "the bonding driver sends learning packets to "
 193                               "each slaves peer switch. The default is 1.");
 194
 195 /*----------------------------- Global variables ----------------------------*/
 196
 197 #ifdef CONFIG_NET_POLL_CONTROLLER
 198 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 199 #endif
 200
 201 unsigned int bond_net_id __read_mostly;
 202
 203 /*-------------------------- Forward declarations ---------------------------*/
 204
 205 static int bond_init(struct net_device *bond_dev);
 206 static void bond_uninit(struct net_device *bond_dev);
 207 static void bond_get_stats(struct net_device *bond_dev,
 208                            struct rtnl_link_stats64 *stats);
 209 static void bond_slave_arr_handler(struct work_struct *work);
 210 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 211                                   int mod);
 212 static void bond_netdev_notify_work(struct work_struct *work);
 213
 214 /*---------------------------- General routines -----------------------------*/
 215
 216 const char *bond_mode_name(int mode)
 217 {
 218         static const char *names[] = {
 219                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 220                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 221                 [BOND_MODE_XOR] = "load balancing (xor)",
 222                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 223                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 224                 [BOND_MODE_TLB] = "transmit load balancing",
 225                 [BOND_MODE_ALB] = "adaptive load balancing",
 226         };
 227
 228         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 229                 return "unknown";
 230
 231         return names[mode];
 232 }
 233
 234 /*---------------------------------- VLAN -----------------------------------*/
 235
 236 /**
 237  * bond_dev_queue_xmit - Prepare skb for xmit.
 238  *
 239  * @bond: bond device that got this skb for tx.
 240  * @skb: hw accel VLAN tagged skb to transmit
 241  * @slave_dev: slave that is supposed to xmit this skbuff
 242  */
 243 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 244                         struct net_device *slave_dev)
 245 {
 246         skb->dev = slave_dev;
 247
 248         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 249                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 250         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 251
 252         if (unlikely(netpoll_tx_running(bond->dev)))
 253                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 254         else
 255                 dev_queue_xmit(skb);
 256 }
 257
 258 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 259  * We don't protect the slave list iteration with a lock because:
 260  * a. This operation is performed in IOCTL context,
 261  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 262  * c. Holding a lock with BH disabled while directly calling a base driver
 263  *    entry point is generally a BAD idea.
 264  *
 265  * The design of synchronization/protection for this operation in the 8021q
 266  * module is good for one or more VLAN devices over a single physical device
 267  * and cannot be extended for a teaming solution like bonding, so there is a
 268  * potential race condition here where a net device from the vlan group might
 269  * be referenced (either by a base driver or the 8021q code) while it is being
 270  * removed from the system. However, it turns out we're not making matters
 271  * worse, and if it works for regular VLAN usage it will work here too.
 272 */
 273
 274 /**
 275  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 276  * @bond_dev: bonding net device that got called
 277  * @vid: vlan id being added
 278  */
 279 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 280                                 __be16 proto, u16 vid)
 281 {
 282         struct bonding *bond = netdev_priv(bond_dev);
 283         struct slave *slave, *rollback_slave;
 284         struct list_head *iter;
 285         int res;
 286
 287         bond_for_each_slave(bond, slave, iter) {
 288                 res = vlan_vid_add(slave->dev, proto, vid);
 289                 if (res)
 290                         goto unwind;
 291         }
 292
 293         return 0;
 294
 295 unwind:
 296         /* unwind to the slave that failed */
 297         bond_for_each_slave(bond, rollback_slave, iter) {
 298                 if (rollback_slave == slave)
 299                         break;
 300
 301                 vlan_vid_del(rollback_slave->dev, proto, vid);
 302         }
 303
 304         return res;
 305 }
 306
 307 /**
 308  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 309  * @bond_dev: bonding net device that got called
 310  * @vid: vlan id being removed
 311  */
 312 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 313                                  __be16 proto, u16 vid)
 314 {
 315         struct bonding *bond = netdev_priv(bond_dev);
 316         struct list_head *iter;
 317         struct slave *slave;
 318
 319         bond_for_each_slave(bond, slave, iter)
 320                 vlan_vid_del(slave->dev, proto, vid);
 321
 322         if (bond_is_lb(bond))
 323                 bond_alb_clear_vlan(bond, vid);
 324
 325         return 0;
 326 }
 327
 328 /*------------------------------- Link status -------------------------------*/
 329
 330 /* Set the carrier state for the master according to the state of its
 331  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 332  * do special 802.3ad magic.
 333  *
 334  * Returns zero if carrier state does not change, nonzero if it does.
 335  */
 336 int bond_set_carrier(struct bonding *bond)
 337 {
 338         struct list_head *iter;
 339         struct slave *slave;
 340
 341         if (!bond_has_slaves(bond))
 342                 goto down;
 343
 344         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 345                 return bond_3ad_set_carrier(bond);
 346
 347         bond_for_each_slave(bond, slave, iter) {
 348                 if (slave->link == BOND_LINK_UP) {
 349                         if (!netif_carrier_ok(bond->dev)) {
 350                                 netif_carrier_on(bond->dev);
 351                                 return 1;
 352                         }
 353                         return 0;
 354                 }
 355         }
 356
 357 down:
 358         if (netif_carrier_ok(bond->dev)) {
 359                 netif_carrier_off(bond->dev);
 360                 return 1;
 361         }
 362         return 0;
 363 }
 364
 365 /* Get link speed and duplex from the slave's base driver
 366  * using ethtool. If for some reason the call fails or the
 367  * values are invalid, set speed and duplex to -1,
 368  * and return. Return 1 if speed or duplex settings are
 369  * UNKNOWN; 0 otherwise.
 370  */
 371 static int bond_update_speed_duplex(struct slave *slave)
 372 {
 373         struct net_device *slave_dev = slave->dev;
 374         struct ethtool_link_ksettings ecmd;
 375         int res;
 376
 377         slave->speed = SPEED_UNKNOWN;
 378         slave->duplex = DUPLEX_UNKNOWN;
 379
 380         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 381         if (res < 0)
 382                 return 1;
 383         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 384                 return 1;
 385         switch (ecmd.base.duplex) {
 386         case DUPLEX_FULL:
 387         case DUPLEX_HALF:
 388                 break;
 389         default:
 390                 return 1;
 391         }
 392
 393         slave->speed = ecmd.base.speed;
 394         slave->duplex = ecmd.base.duplex;
 395
 396         return 0;
 397 }
 398
 399 const char *bond_slave_link_status(s8 link)
 400 {
 401         switch (link) {
 402         case BOND_LINK_UP:
 403                 return "up";
 404         case BOND_LINK_FAIL:
 405                 return "going down";
 406         case BOND_LINK_DOWN:
 407                 return "down";
 408         case BOND_LINK_BACK:
 409                 return "going back";
 410         default:
 411                 return "unknown";
 412         }
 413 }
 414
 415 /* if <dev> supports MII link status reporting, check its link status.
 416  *
 417  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 418  * depending upon the setting of the use_carrier parameter.
 419  *
 420  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 421  * can't tell and just pretend it is), or 0, meaning that the link is
 422  * down.
 423  *
 424  * If reporting is non-zero, instead of faking link up, return -1 if
 425  * both ETHTOOL and MII ioctls fail (meaning the device does not
 426  * support them).  If use_carrier is set, return whatever it says.
 427  * It'd be nice if there was a good way to tell if a driver supports
 428  * netif_carrier, but there really isn't.
 429  */
 430 static int bond_check_dev_link(struct bonding *bond,
 431                                struct net_device *slave_dev, int reporting)
 432 {
 433         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 434         int (*ioctl)(struct net_device *, struct ifreq *, int);
 435         struct ifreq ifr;
 436         struct mii_ioctl_data *mii;
 437
 438         if (!reporting && !netif_running(slave_dev))
 439                 return 0;
 440
 441         if (bond->params.use_carrier)
 442                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 443
 444         /* Try to get link status using Ethtool first. */
 445         if (slave_dev->ethtool_ops->get_link)
 446                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 447                         BMSR_LSTATUS : 0;
 448
 449         /* Ethtool can't be used, fallback to MII ioctls. */
 450         ioctl = slave_ops->ndo_do_ioctl;
 451         if (ioctl) {
 452                 /* TODO: set pointer to correct ioctl on a per team member
 453                  *       bases to make this more efficient. that is, once
 454                  *       we determine the correct ioctl, we will always
 455                  *       call it and not the others for that team
 456                  *       member.
 457                  */
 458
 459                 /* We cannot assume that SIOCGMIIPHY will also read a
 460                  * register; not all network drivers (e.g., e100)
 461                  * support that.
 462                  */
 463
 464                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 465                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 466                 mii = if_mii(&ifr);
 467                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 468                         mii->reg_num = MII_BMSR;
 469                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 470                                 return mii->val_out & BMSR_LSTATUS;
 471                 }
 472         }
 473
 474         /* If reporting, report that either there's no dev->do_ioctl,
 475          * or both SIOCGMIIREG and get_link failed (meaning that we
 476          * cannot report link status).  If not reporting, pretend
 477          * we're ok.
 478          */
 479         return reporting ? -1 : BMSR_LSTATUS;
 480 }
 481
 482 /*----------------------------- Multicast list ------------------------------*/
 483
 484 /* Push the promiscuity flag down to appropriate slaves */
 485 static int bond_set_promiscuity(struct bonding *bond, int inc)
 486 {
 487         struct list_head *iter;
 488         int err = 0;
 489
 490         if (bond_uses_primary(bond)) {
 491                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 492
 493                 if (curr_active)
 494                         err = dev_set_promiscuity(curr_active->dev, inc);
 495         } else {
 496                 struct slave *slave;
 497
 498                 bond_for_each_slave(bond, slave, iter) {
 499                         err = dev_set_promiscuity(slave->dev, inc);
 500                         if (err)
 501                                 return err;
 502                 }
 503         }
 504         return err;
 505 }
 506
 507 /* Push the allmulti flag down to all slaves */
 508 static int bond_set_allmulti(struct bonding *bond, int inc)
 509 {
 510         struct list_head *iter;
 511         int err = 0;
 512
 513         if (bond_uses_primary(bond)) {
 514                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 515
 516                 if (curr_active)
 517                         err = dev_set_allmulti(curr_active->dev, inc);
 518         } else {
 519                 struct slave *slave;
 520
 521                 bond_for_each_slave(bond, slave, iter) {
 522                         err = dev_set_allmulti(slave->dev, inc);
 523                         if (err)
 524                                 return err;
 525                 }
 526         }
 527         return err;
 528 }
 529
 530 /* Retrieve the list of registered multicast addresses for the bonding
 531  * device and retransmit an IGMP JOIN request to the current active
 532  * slave.
 533  */
 534 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 535 {
 536         struct bonding *bond = container_of(work, struct bonding,
 537                                             mcast_work.work);
 538
 539         if (!rtnl_trylock()) {
 540                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 541                 return;
 542         }
 543         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 544
 545         if (bond->igmp_retrans > 1) {
 546                 bond->igmp_retrans--;
 547                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 548         }
 549         rtnl_unlock();
 550 }
 551
 552 /* Flush bond's hardware addresses from slave */
 553 static void bond_hw_addr_flush(struct net_device *bond_dev,
 554                                struct net_device *slave_dev)
 555 {
 556         struct bonding *bond = netdev_priv(bond_dev);
 557
 558         dev_uc_unsync(slave_dev, bond_dev);
 559         dev_mc_unsync(slave_dev, bond_dev);
 560
 561         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 562                 /* del lacpdu mc addr from mc list */
 563                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 564
 565                 dev_mc_del(slave_dev, lacpdu_multicast);
 566         }
 567 }
 568
 569 /*--------------------------- Active slave change ---------------------------*/
 570
 571 /* Update the hardware address list and promisc/allmulti for the new and
 572  * old active slaves (if any).  Modes that are not using primary keep all
 573  * slaves up date at all times; only the modes that use primary need to call
 574  * this function to swap these settings during a failover.
 575  */
 576 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 577                               struct slave *old_active)
 578 {
 579         if (old_active) {
 580                 if (bond->dev->flags & IFF_PROMISC)
 581                         dev_set_promiscuity(old_active->dev, -1);
 582
 583                 if (bond->dev->flags & IFF_ALLMULTI)
 584                         dev_set_allmulti(old_active->dev, -1);
 585
 586                 bond_hw_addr_flush(bond->dev, old_active->dev);
 587         }
 588
 589         if (new_active) {
 590                 /* FIXME: Signal errors upstream. */
 591                 if (bond->dev->flags & IFF_PROMISC)
 592                         dev_set_promiscuity(new_active->dev, 1);
 593
 594                 if (bond->dev->flags & IFF_ALLMULTI)
 595                         dev_set_allmulti(new_active->dev, 1);
 596
 597                 netif_addr_lock_bh(bond->dev);
 598                 dev_uc_sync(new_active->dev, bond->dev);
 599                 dev_mc_sync(new_active->dev, bond->dev);
 600                 netif_addr_unlock_bh(bond->dev);
 601         }
 602 }
 603
 604 /**
 605  * bond_set_dev_addr - clone slave's address to bond
 606  * @bond_dev: bond net device
 607  * @slave_dev: slave net device
 608  *
 609  * Should be called with RTNL held.
 610  */
 611 static int bond_set_dev_addr(struct net_device *bond_dev,
 612                              struct net_device *slave_dev)
 613 {
 614         int err;
 615
 616         netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n",
 617                    bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len);
 618         err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 619         if (err)
 620                 return err;
 621
 622         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 623         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 624         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 625         return 0;
 626 }
 627
 628 static struct slave *bond_get_old_active(struct bonding *bond,
 629                                          struct slave *new_active)
 630 {
 631         struct slave *slave;
 632         struct list_head *iter;
 633
 634         bond_for_each_slave(bond, slave, iter) {
 635                 if (slave == new_active)
 636                         continue;
 637
 638                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 639                         return slave;
 640         }
 641
 642         return NULL;
 643 }
 644
 645 /* bond_do_fail_over_mac
 646  *
 647  * Perform special MAC address swapping for fail_over_mac settings
 648  *
 649  * Called with RTNL
 650  */
 651 static void bond_do_fail_over_mac(struct bonding *bond,
 652                                   struct slave *new_active,
 653                                   struct slave *old_active)
 654 {
 655         u8 tmp_mac[MAX_ADDR_LEN];
 656         struct sockaddr_storage ss;
 657         int rv;
 658
 659         switch (bond->params.fail_over_mac) {
 660         case BOND_FOM_ACTIVE:
 661                 if (new_active) {
 662                         rv = bond_set_dev_addr(bond->dev, new_active->dev);
 663                         if (rv)
 664                                 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 665                                            -rv, bond->dev->name);
 666                 }
 667                 break;
 668         case BOND_FOM_FOLLOW:
 669                 /* if new_active && old_active, swap them
 670                  * if just old_active, do nothing (going to no active slave)
 671                  * if just new_active, set new_active to bond's MAC
 672                  */
 673                 if (!new_active)
 674                         return;
 675
 676                 if (!old_active)
 677                         old_active = bond_get_old_active(bond, new_active);
 678
 679                 if (old_active) {
 680                         bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 681                                           new_active->dev->addr_len);
 682                         bond_hw_addr_copy(ss.__data,
 683                                           old_active->dev->dev_addr,
 684                                           old_active->dev->addr_len);
 685                         ss.ss_family = new_active->dev->type;
 686                 } else {
 687                         bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 688                                           bond->dev->addr_len);
 689                         ss.ss_family = bond->dev->type;
 690                 }
 691
 692                 rv = dev_set_mac_address(new_active->dev,
 693                                          (struct sockaddr *)&ss, NULL);
 694                 if (rv) {
 695                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 696                                    -rv, new_active->dev->name);
 697                         goto out;
 698                 }
 699
 700                 if (!old_active)
 701                         goto out;
 702
 703                 bond_hw_addr_copy(ss.__data, tmp_mac,
 704                                   new_active->dev->addr_len);
 705                 ss.ss_family = old_active->dev->type;
 706
 707                 rv = dev_set_mac_address(old_active->dev,
 708                                          (struct sockaddr *)&ss, NULL);
 709                 if (rv)
 710                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 711                                    -rv, new_active->dev->name);
 712 out:
 713                 break;
 714         default:
 715                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 716                            bond->params.fail_over_mac);
 717                 break;
 718         }
 719
 720 }
 721
 722 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
 723 {
 724         struct slave *prim = rtnl_dereference(bond->primary_slave);
 725         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 726
 727         if (!prim || prim->link != BOND_LINK_UP) {
 728                 if (!curr || curr->link != BOND_LINK_UP)
 729                         return NULL;
 730                 return curr;
 731         }
 732
 733         if (bond->force_primary) {
 734                 bond->force_primary = false;
 735                 return prim;
 736         }
 737
 738         if (!curr || curr->link != BOND_LINK_UP)
 739                 return prim;
 740
 741         /* At this point, prim and curr are both up */
 742         switch (bond->params.primary_reselect) {
 743         case BOND_PRI_RESELECT_ALWAYS:
 744                 return prim;
 745         case BOND_PRI_RESELECT_BETTER:
 746                 if (prim->speed < curr->speed)
 747                         return curr;
 748                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
 749                         return curr;
 750                 return prim;
 751         case BOND_PRI_RESELECT_FAILURE:
 752                 return curr;
 753         default:
 754                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
 755                            bond->params.primary_reselect);
 756                 return curr;
 757         }
 758 }
 759
 760 /**
 761  * bond_find_best_slave - select the best available slave to be the active one
 762  * @bond: our bonding struct
 763  */
 764 static struct slave *bond_find_best_slave(struct bonding *bond)
 765 {
 766         struct slave *slave, *bestslave = NULL;
 767         struct list_head *iter;
 768         int mintime = bond->params.updelay;
 769
 770         slave = bond_choose_primary_or_current(bond);
 771         if (slave)
 772                 return slave;
 773
 774         bond_for_each_slave(bond, slave, iter) {
 775                 if (slave->link == BOND_LINK_UP)
 776                         return slave;
 777                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 778                     slave->delay < mintime) {
 779                         mintime = slave->delay;
 780                         bestslave = slave;
 781                 }
 782         }
 783
 784         return bestslave;
 785 }
 786
 787 static bool bond_should_notify_peers(struct bonding *bond)
 788 {
 789         struct slave *slave;
 790
 791         rcu_read_lock();
 792         slave = rcu_dereference(bond->curr_active_slave);
 793         rcu_read_unlock();
 794
 795         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 796                    slave ? slave->dev->name : "NULL");
 797
 798         if (!slave || !bond->send_peer_notif ||
 799             !netif_carrier_ok(bond->dev) ||
 800             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 801                 return false;
 802
 803         return true;
 804 }
 805
 806 /**
 807  * change_active_interface - change the active slave into the specified one
 808  * @bond: our bonding struct
 809  * @new: the new slave to make the active one
 810  *
 811  * Set the new slave to the bond's settings and unset them on the old
 812  * curr_active_slave.
 813  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 814  *
 815  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 816  * because it is apparently the best available slave we have, even though its
 817  * updelay hasn't timed out yet.
 818  *
 819  * Caller must hold RTNL.
 820  */
 821 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 822 {
 823         struct slave *old_active;
 824
 825         ASSERT_RTNL();
 826
 827         old_active = rtnl_dereference(bond->curr_active_slave);
 828
 829         if (old_active == new_active)
 830                 return;
 831
 832         if (new_active) {
 833                 new_active->last_link_up = jiffies;
 834
 835                 if (new_active->link == BOND_LINK_BACK) {
 836                         if (bond_uses_primary(bond)) {
 837                                 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
 838                                             new_active->dev->name,
 839                                             (bond->params.updelay - new_active->delay) * bond->params.miimon);
 840                         }
 841
 842                         new_active->delay = 0;
 843                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
 844                                                   BOND_SLAVE_NOTIFY_NOW);
 845
 846                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 847                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 848
 849                         if (bond_is_lb(bond))
 850                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 851                 } else {
 852                         if (bond_uses_primary(bond)) {
 853                                 netdev_info(bond->dev, "making interface %s the new active one\n",
 854                                             new_active->dev->name);
 855                         }
 856                 }
 857         }
 858
 859         if (bond_uses_primary(bond))
 860                 bond_hw_addr_swap(bond, new_active, old_active);
 861
 862         if (bond_is_lb(bond)) {
 863                 bond_alb_handle_active_change(bond, new_active);
 864                 if (old_active)
 865                         bond_set_slave_inactive_flags(old_active,
 866                                                       BOND_SLAVE_NOTIFY_NOW);
 867                 if (new_active)
 868                         bond_set_slave_active_flags(new_active,
 869                                                     BOND_SLAVE_NOTIFY_NOW);
 870         } else {
 871                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 872         }
 873
 874         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
 875                 if (old_active)
 876                         bond_set_slave_inactive_flags(old_active,
 877                                                       BOND_SLAVE_NOTIFY_NOW);
 878
 879                 if (new_active) {
 880                         bool should_notify_peers = false;
 881
 882                         bond_set_slave_active_flags(new_active,
 883                                                     BOND_SLAVE_NOTIFY_NOW);
 884
 885                         if (bond->params.fail_over_mac)
 886                                 bond_do_fail_over_mac(bond, new_active,
 887                                                       old_active);
 888
 889                         if (netif_running(bond->dev)) {
 890                                 bond->send_peer_notif =
 891                                         bond->params.num_peer_notif;
 892                                 should_notify_peers =
 893                                         bond_should_notify_peers(bond);
 894                         }
 895
 896                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 897                         if (should_notify_peers)
 898                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 899                                                          bond->dev);
 900                 }
 901         }
 902
 903         /* resend IGMP joins since active slave has changed or
 904          * all were sent on curr_active_slave.
 905          * resend only if bond is brought up with the affected
 906          * bonding modes and the retransmission is enabled
 907          */
 908         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 909             ((bond_uses_primary(bond) && new_active) ||
 910              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
 911                 bond->igmp_retrans = bond->params.resend_igmp;
 912                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 913         }
 914 }
 915
 916 /**
 917  * bond_select_active_slave - select a new active slave, if needed
 918  * @bond: our bonding struct
 919  *
 920  * This functions should be called when one of the following occurs:
 921  * - The old curr_active_slave has been released or lost its link.
 922  * - The primary_slave has got its link back.
 923  * - A slave has got its link back and there's no old curr_active_slave.
 924  *
 925  * Caller must hold RTNL.
 926  */
 927 void bond_select_active_slave(struct bonding *bond)
 928 {
 929         struct slave *best_slave;
 930         int rv;
 931
 932         ASSERT_RTNL();
 933
 934         best_slave = bond_find_best_slave(bond);
 935         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
 936                 bond_change_active_slave(bond, best_slave);
 937                 rv = bond_set_carrier(bond);
 938                 if (!rv)
 939                         return;
 940
 941                 if (netif_carrier_ok(bond->dev))
 942                         netdev_info(bond->dev, "first active interface up!\n");
 943                 else
 944                         netdev_info(bond->dev, "now running without any active interface!\n");
 945         }
 946 }
 947
 948 #ifdef CONFIG_NET_POLL_CONTROLLER
 949 static inline int slave_enable_netpoll(struct slave *slave)
 950 {
 951         struct netpoll *np;
 952         int err = 0;
 953
 954         np = kzalloc(sizeof(*np), GFP_KERNEL);
 955         err = -ENOMEM;
 956         if (!np)
 957                 goto out;
 958
 959         err = __netpoll_setup(np, slave->dev);
 960         if (err) {
 961                 kfree(np);
 962                 goto out;
 963         }
 964         slave->np = np;
 965 out:
 966         return err;
 967 }
 968 static inline void slave_disable_netpoll(struct slave *slave)
 969 {
 970         struct netpoll *np = slave->np;
 971
 972         if (!np)
 973                 return;
 974
 975         slave->np = NULL;
 976
 977         __netpoll_free(np);
 978 }
 979
 980 static void bond_poll_controller(struct net_device *bond_dev)
 981 {
 982         struct bonding *bond = netdev_priv(bond_dev);
 983         struct slave *slave = NULL;
 984         struct list_head *iter;
 985         struct ad_info ad_info;
 986
 987         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 988                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
 989                         return;
 990
 991         bond_for_each_slave_rcu(bond, slave, iter) {
 992                 if (!bond_slave_is_up(slave))
 993                         continue;
 994
 995                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 996                         struct aggregator *agg =
 997                             SLAVE_AD_INFO(slave)->port.aggregator;
 998
 999                         if (agg &&
1000                             agg->aggregator_identifier != ad_info.aggregator_id)
1001                                 continue;
1002                 }
1003
1004                 netpoll_poll_dev(slave->dev);
1005         }
1006 }
1007
1008 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1009 {
1010         struct bonding *bond = netdev_priv(bond_dev);
1011         struct list_head *iter;
1012         struct slave *slave;
1013
1014         bond_for_each_slave(bond, slave, iter)
1015                 if (bond_slave_is_up(slave))
1016                         slave_disable_netpoll(slave);
1017 }
1018
1019 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1020 {
1021         struct bonding *bond = netdev_priv(dev);
1022         struct list_head *iter;
1023         struct slave *slave;
1024         int err = 0;
1025
1026         bond_for_each_slave(bond, slave, iter) {
1027                 err = slave_enable_netpoll(slave);
1028                 if (err) {
1029                         bond_netpoll_cleanup(dev);
1030                         break;
1031                 }
1032         }
1033         return err;
1034 }
1035 #else
1036 static inline int slave_enable_netpoll(struct slave *slave)
1037 {
1038         return 0;
1039 }
1040 static inline void slave_disable_netpoll(struct slave *slave)
1041 {
1042 }
1043 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1044 {
1045 }
1046 #endif
1047
1048 /*---------------------------------- IOCTL ----------------------------------*/
1049
1050 static netdev_features_t bond_fix_features(struct net_device *dev,
1051                                            netdev_features_t features)
1052 {
1053         struct bonding *bond = netdev_priv(dev);
1054         struct list_head *iter;
1055         netdev_features_t mask;
1056         struct slave *slave;
1057
1058         mask = features;
1059
1060         features &= ~NETIF_F_ONE_FOR_ALL;
1061         features |= NETIF_F_ALL_FOR_ALL;
1062
1063         bond_for_each_slave(bond, slave, iter) {
1064                 features = netdev_increment_features(features,
1065                                                      slave->dev->features,
1066                                                      mask);
1067         }
1068         features = netdev_add_tso_features(features, mask);
1069
1070         return features;
1071 }
1072
1073 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1074                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1075                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1076
1077 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1078                                  NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1079
1080 static void bond_compute_features(struct bonding *bond)
1081 {
1082         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1083                                         IFF_XMIT_DST_RELEASE_PERM;
1084         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1085         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1086         struct net_device *bond_dev = bond->dev;
1087         struct list_head *iter;
1088         struct slave *slave;
1089         unsigned short max_hard_header_len = ETH_HLEN;
1090         unsigned int gso_max_size = GSO_MAX_SIZE;
1091         u16 gso_max_segs = GSO_MAX_SEGS;
1092
1093         if (!bond_has_slaves(bond))
1094                 goto done;
1095         vlan_features &= NETIF_F_ALL_FOR_ALL;
1096
1097         bond_for_each_slave(bond, slave, iter) {
1098                 vlan_features = netdev_increment_features(vlan_features,
1099                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1100
1101                 enc_features = netdev_increment_features(enc_features,
1102                                                          slave->dev->hw_enc_features,
1103                                                          BOND_ENC_FEATURES);
1104                 dst_release_flag &= slave->dev->priv_flags;
1105                 if (slave->dev->hard_header_len > max_hard_header_len)
1106                         max_hard_header_len = slave->dev->hard_header_len;
1107
1108                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1109                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1110         }
1111         bond_dev->hard_header_len = max_hard_header_len;
1112
1113 done:
1114         bond_dev->vlan_features = vlan_features;
1115         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1116                                     NETIF_F_GSO_UDP_L4;
1117         bond_dev->gso_max_segs = gso_max_segs;
1118         netif_set_gso_max_size(bond_dev, gso_max_size);
1119
1120         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1121         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1122             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1123                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1124
1125         netdev_change_features(bond_dev);
1126 }
1127
1128 static void bond_setup_by_slave(struct net_device *bond_dev,
1129                                 struct net_device *slave_dev)
1130 {
1131         bond_dev->header_ops        = slave_dev->header_ops;
1132
1133         bond_dev->type              = slave_dev->type;
1134         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1135         bond_dev->addr_len          = slave_dev->addr_len;
1136
1137         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1138                 slave_dev->addr_len);
1139 }
1140
1141 /* On bonding slaves other than the currently active slave, suppress
1142  * duplicates except for alb non-mcast/bcast.
1143  */
1144 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1145                                             struct slave *slave,
1146                                             struct bonding *bond)
1147 {
1148         if (bond_is_slave_inactive(slave)) {
1149                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1150                     skb->pkt_type != PACKET_BROADCAST &&
1151                     skb->pkt_type != PACKET_MULTICAST)
1152                         return false;
1153                 return true;
1154         }
1155         return false;
1156 }
1157
1158 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1159 {
1160         struct sk_buff *skb = *pskb;
1161         struct slave *slave;
1162         struct bonding *bond;
1163         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1164                           struct slave *);
1165         int ret = RX_HANDLER_ANOTHER;
1166
1167         skb = skb_share_check(skb, GFP_ATOMIC);
1168         if (unlikely(!skb))
1169                 return RX_HANDLER_CONSUMED;
1170
1171         *pskb = skb;
1172
1173         slave = bond_slave_get_rcu(skb->dev);
1174         bond = slave->bond;
1175
1176         recv_probe = READ_ONCE(bond->recv_probe);
1177         if (recv_probe) {
1178                 ret = recv_probe(skb, bond, slave);
1179                 if (ret == RX_HANDLER_CONSUMED) {
1180                         consume_skb(skb);
1181                         return ret;
1182                 }
1183         }
1184
1185         /*
1186          * For packets determined by bond_should_deliver_exact_match() call to
1187          * be suppressed we want to make an exception for link-local packets.
1188          * This is necessary for e.g. LLDP daemons to be able to monitor
1189          * inactive slave links without being forced to bind to them
1190          * explicitly.
1191          *
1192          * At the same time, packets that are passed to the bonding master
1193          * (including link-local ones) can have their originating interface
1194          * determined via PACKET_ORIGDEV socket option.
1195          */
1196         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1197                 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1198                         return RX_HANDLER_PASS;
1199                 return RX_HANDLER_EXACT;
1200         }
1201
1202         skb->dev = bond->dev;
1203
1204         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1205             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1206             skb->pkt_type == PACKET_HOST) {
1207
1208                 if (unlikely(skb_cow_head(skb,
1209                                           skb->data - skb_mac_header(skb)))) {
1210                         kfree_skb(skb);
1211                         return RX_HANDLER_CONSUMED;
1212                 }
1213                 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1214                                   bond->dev->addr_len);
1215         }
1216
1217         return ret;
1218 }
1219
1220 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1221 {
1222         switch (BOND_MODE(bond)) {
1223         case BOND_MODE_ROUNDROBIN:
1224                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1225         case BOND_MODE_ACTIVEBACKUP:
1226                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1227         case BOND_MODE_BROADCAST:
1228                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1229         case BOND_MODE_XOR:
1230         case BOND_MODE_8023AD:
1231                 return NETDEV_LAG_TX_TYPE_HASH;
1232         default:
1233                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1234         }
1235 }
1236
1237 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1238                                                enum netdev_lag_tx_type type)
1239 {
1240         if (type != NETDEV_LAG_TX_TYPE_HASH)
1241                 return NETDEV_LAG_HASH_NONE;
1242
1243         switch (bond->params.xmit_policy) {
1244         case BOND_XMIT_POLICY_LAYER2:
1245                 return NETDEV_LAG_HASH_L2;
1246         case BOND_XMIT_POLICY_LAYER34:
1247                 return NETDEV_LAG_HASH_L34;
1248         case BOND_XMIT_POLICY_LAYER23:
1249                 return NETDEV_LAG_HASH_L23;
1250         case BOND_XMIT_POLICY_ENCAP23:
1251                 return NETDEV_LAG_HASH_E23;
1252         case BOND_XMIT_POLICY_ENCAP34:
1253                 return NETDEV_LAG_HASH_E34;
1254         default:
1255                 return NETDEV_LAG_HASH_UNKNOWN;
1256         }
1257 }
1258
1259 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1260                                       struct netlink_ext_ack *extack)
1261 {
1262         struct netdev_lag_upper_info lag_upper_info;
1263         enum netdev_lag_tx_type type;
1264
1265         type = bond_lag_tx_type(bond);
1266         lag_upper_info.tx_type = type;
1267         lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1268
1269         return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1270                                             &lag_upper_info, extack);
1271 }
1272
1273 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1274 {
1275         netdev_upper_dev_unlink(slave->dev, bond->dev);
1276         slave->dev->flags &= ~IFF_SLAVE;
1277 }
1278
1279 static struct slave *bond_alloc_slave(struct bonding *bond)
1280 {
1281         struct slave *slave = NULL;
1282
1283         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1284         if (!slave)
1285                 return NULL;
1286
1287         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1288                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1289                                                GFP_KERNEL);
1290                 if (!SLAVE_AD_INFO(slave)) {
1291                         kfree(slave);
1292                         return NULL;
1293                 }
1294         }
1295         INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1296
1297         return slave;
1298 }
1299
1300 static void bond_free_slave(struct slave *slave)
1301 {
1302         struct bonding *bond = bond_get_bond_by_slave(slave);
1303
1304         cancel_delayed_work_sync(&slave->notify_work);
1305         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1306                 kfree(SLAVE_AD_INFO(slave));
1307
1308         kfree(slave);
1309 }
1310
1311 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1312 {
1313         info->bond_mode = BOND_MODE(bond);
1314         info->miimon = bond->params.miimon;
1315         info->num_slaves = bond->slave_cnt;
1316 }
1317
1318 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1319 {
1320         strcpy(info->slave_name, slave->dev->name);
1321         info->link = slave->link;
1322         info->state = bond_slave_state(slave);
1323         info->link_failure_count = slave->link_failure_count;
1324 }
1325
1326 static void bond_netdev_notify_work(struct work_struct *_work)
1327 {
1328         struct slave *slave = container_of(_work, struct slave,
1329                                            notify_work.work);
1330
1331         if (rtnl_trylock()) {
1332                 struct netdev_bonding_info binfo;
1333
1334                 bond_fill_ifslave(slave, &binfo.slave);
1335                 bond_fill_ifbond(slave->bond, &binfo.master);
1336                 netdev_bonding_info_change(slave->dev, &binfo);
1337                 rtnl_unlock();
1338         } else {
1339                 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1340         }
1341 }
1342
1343 void bond_queue_slave_event(struct slave *slave)
1344 {
1345         queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1346 }
1347
1348 void bond_lower_state_changed(struct slave *slave)
1349 {
1350         struct netdev_lag_lower_state_info info;
1351
1352         info.link_up = slave->link == BOND_LINK_UP ||
1353                        slave->link == BOND_LINK_FAIL;
1354         info.tx_enabled = bond_is_active_slave(slave);
1355         netdev_lower_state_changed(slave->dev, &info);
1356 }
1357
1358 /* enslave device <slave> to bond device <master> */
1359 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1360                  struct netlink_ext_ack *extack)
1361 {
1362         struct bonding *bond = netdev_priv(bond_dev);
1363         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1364         struct slave *new_slave = NULL, *prev_slave;
1365         struct sockaddr_storage ss;
1366         int link_reporting;
1367         int res = 0, i;
1368
1369         if (!bond->params.use_carrier &&
1370             slave_dev->ethtool_ops->get_link == NULL &&
1371             slave_ops->ndo_do_ioctl == NULL) {
1372                 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1373                             slave_dev->name);
1374         }
1375
1376         /* already in-use? */
1377         if (netdev_is_rx_handler_busy(slave_dev)) {
1378                 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1379                 netdev_err(bond_dev,
1380                            "Error: Device is in use and cannot be enslaved\n");
1381                 return -EBUSY;
1382         }
1383
1384         if (bond_dev == slave_dev) {
1385                 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1386                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1387                 return -EPERM;
1388         }
1389
1390         /* vlan challenged mutual exclusion */
1391         /* no need to lock since we're protected by rtnl_lock */
1392         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1393                 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1394                            slave_dev->name);
1395                 if (vlan_uses_dev(bond_dev)) {
1396                         NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1397                         netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1398                                    slave_dev->name, bond_dev->name);
1399                         return -EPERM;
1400                 } else {
1401                         netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1402                                     slave_dev->name, slave_dev->name,
1403                                     bond_dev->name);
1404                 }
1405         } else {
1406                 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1407                            slave_dev->name);
1408         }
1409
1410         /* Old ifenslave binaries are no longer supported.  These can
1411          * be identified with moderate accuracy by the state of the slave:
1412          * the current ifenslave will set the interface down prior to
1413          * enslaving it; the old ifenslave will not.
1414          */
1415         if (slave_dev->flags & IFF_UP) {
1416                 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1417                 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1418                            slave_dev->name);
1419                 return -EPERM;
1420         }
1421
1422         /* set bonding device ether type by slave - bonding netdevices are
1423          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1424          * there is a need to override some of the type dependent attribs/funcs.
1425          *
1426          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1427          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1428          */
1429         if (!bond_has_slaves(bond)) {
1430                 if (bond_dev->type != slave_dev->type) {
1431                         netdev_dbg(bond_dev, "change device type from %d to %d\n",
1432                                    bond_dev->type, slave_dev->type);
1433
1434                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1435                                                        bond_dev);
1436                         res = notifier_to_errno(res);
1437                         if (res) {
1438                                 netdev_err(bond_dev, "refused to change device type\n");
1439                                 return -EBUSY;
1440                         }
1441
1442                         /* Flush unicast and multicast addresses */
1443                         dev_uc_flush(bond_dev);
1444                         dev_mc_flush(bond_dev);
1445
1446                         if (slave_dev->type != ARPHRD_ETHER)
1447                                 bond_setup_by_slave(bond_dev, slave_dev);
1448                         else {
1449                                 ether_setup(bond_dev);
1450                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1451                         }
1452
1453                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1454                                                  bond_dev);
1455                 }
1456         } else if (bond_dev->type != slave_dev->type) {
1457                 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1458                 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1459                            slave_dev->name, slave_dev->type, bond_dev->type);
1460                 return -EINVAL;
1461         }
1462
1463         if (slave_dev->type == ARPHRD_INFINIBAND &&
1464             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1465                 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1466                 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n",
1467                             slave_dev->type);
1468                 res = -EOPNOTSUPP;
1469                 goto err_undo_flags;
1470         }
1471
1472         if (!slave_ops->ndo_set_mac_address ||
1473             slave_dev->type == ARPHRD_INFINIBAND) {
1474                 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1475                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1476                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1477                         if (!bond_has_slaves(bond)) {
1478                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1479                                 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1480                         } else {
1481                                 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1482                                 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");
1483                                 res = -EOPNOTSUPP;
1484                                 goto err_undo_flags;
1485                         }
1486                 }
1487         }
1488
1489         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1490
1491         /* If this is the first slave, then we need to set the master's hardware
1492          * address to be the same as the slave's.
1493          */
1494         if (!bond_has_slaves(bond) &&
1495             bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1496                 res = bond_set_dev_addr(bond->dev, slave_dev);
1497                 if (res)
1498                         goto err_undo_flags;
1499         }
1500
1501         new_slave = bond_alloc_slave(bond);
1502         if (!new_slave) {
1503                 res = -ENOMEM;
1504                 goto err_undo_flags;
1505         }
1506
1507         new_slave->bond = bond;
1508         new_slave->dev = slave_dev;
1509         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1510          * is set via sysfs or module option if desired.
1511          */
1512         new_slave->queue_id = 0;
1513
1514         /* Save slave's original mtu and then set it to match the bond */
1515         new_slave->original_mtu = slave_dev->mtu;
1516         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1517         if (res) {
1518                 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1519                 goto err_free;
1520         }
1521
1522         /* Save slave's original ("permanent") mac address for modes
1523          * that need it, and for restoring it upon release, and then
1524          * set it to the master's address
1525          */
1526         bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1527                           slave_dev->addr_len);
1528
1529         if (!bond->params.fail_over_mac ||
1530             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1531                 /* Set slave to master's mac address.  The application already
1532                  * set the master's mac address to that of the first slave
1533                  */
1534                 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1535                 ss.ss_family = slave_dev->type;
1536                 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1537                                           extack);
1538                 if (res) {
1539                         netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1540                         goto err_restore_mtu;
1541                 }
1542         }
1543
1544         /* set slave flag before open to prevent IPv6 addrconf */
1545         slave_dev->flags |= IFF_SLAVE;
1546
1547         /* open the slave since the application closed it */
1548         res = dev_open(slave_dev, extack);
1549         if (res) {
1550                 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1551                 goto err_restore_mac;
1552         }
1553
1554         slave_dev->priv_flags |= IFF_BONDING;
1555         /* initialize slave stats */
1556         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1557
1558         if (bond_is_lb(bond)) {
1559                 /* bond_alb_init_slave() must be called before all other stages since
1560                  * it might fail and we do not want to have to undo everything
1561                  */
1562                 res = bond_alb_init_slave(bond, new_slave);
1563                 if (res)
1564                         goto err_close;
1565         }
1566
1567         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1568         if (res) {
1569                 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1570                            slave_dev->name);
1571                 goto err_close;
1572         }
1573
1574         prev_slave = bond_last_slave(bond);
1575
1576         new_slave->delay = 0;
1577         new_slave->link_failure_count = 0;
1578
1579         if (bond_update_speed_duplex(new_slave) &&
1580             bond_needs_speed_duplex(bond))
1581                 new_slave->link = BOND_LINK_DOWN;
1582
1583         new_slave->last_rx = jiffies -
1584                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1585         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1586                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1587
1588         if (bond->params.miimon && !bond->params.use_carrier) {
1589                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1590
1591                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1592                         /* miimon is set but a bonded network driver
1593                          * does not support ETHTOOL/MII and
1594                          * arp_interval is not set.  Note: if
1595                          * use_carrier is enabled, we will never go
1596                          * here (because netif_carrier is always
1597                          * supported); thus, we don't need to change
1598                          * the messages for netif_carrier.
1599                          */
1600                         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",
1601                                     slave_dev->name);
1602                 } else if (link_reporting == -1) {
1603                         /* unable get link status using mii/ethtool */
1604                         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",
1605                                     slave_dev->name);
1606                 }
1607         }
1608
1609         /* check for initial state */
1610         new_slave->link = BOND_LINK_NOCHANGE;
1611         if (bond->params.miimon) {
1612                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1613                         if (bond->params.updelay) {
1614                                 bond_set_slave_link_state(new_slave,
1615                                                           BOND_LINK_BACK,
1616                                                           BOND_SLAVE_NOTIFY_NOW);
1617                                 new_slave->delay = bond->params.updelay;
1618                         } else {
1619                                 bond_set_slave_link_state(new_slave,
1620                                                           BOND_LINK_UP,
1621                                                           BOND_SLAVE_NOTIFY_NOW);
1622                         }
1623                 } else {
1624                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1625                                                   BOND_SLAVE_NOTIFY_NOW);
1626                 }
1627         } else if (bond->params.arp_interval) {
1628                 bond_set_slave_link_state(new_slave,
1629                                           (netif_carrier_ok(slave_dev) ?
1630                                           BOND_LINK_UP : BOND_LINK_DOWN),
1631                                           BOND_SLAVE_NOTIFY_NOW);
1632         } else {
1633                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1634                                           BOND_SLAVE_NOTIFY_NOW);
1635         }
1636
1637         if (new_slave->link != BOND_LINK_DOWN)
1638                 new_slave->last_link_up = jiffies;
1639         netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1640                    new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1641                    (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1642
1643         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1644                 /* if there is a primary slave, remember it */
1645                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1646                         rcu_assign_pointer(bond->primary_slave, new_slave);
1647                         bond->force_primary = true;
1648                 }
1649         }
1650
1651         switch (BOND_MODE(bond)) {
1652         case BOND_MODE_ACTIVEBACKUP:
1653                 bond_set_slave_inactive_flags(new_slave,
1654                                               BOND_SLAVE_NOTIFY_NOW);
1655                 break;
1656         case BOND_MODE_8023AD:
1657                 /* in 802.3ad mode, the internal mechanism
1658                  * will activate the slaves in the selected
1659                  * aggregator
1660                  */
1661                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1662                 /* if this is the first slave */
1663                 if (!prev_slave) {
1664                         SLAVE_AD_INFO(new_slave)->id = 1;
1665                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1666                          * can be called only after the mac address of the bond is set
1667                          */
1668                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1669                 } else {
1670                         SLAVE_AD_INFO(new_slave)->id =
1671                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1672                 }
1673
1674                 bond_3ad_bind_slave(new_slave);
1675                 break;
1676         case BOND_MODE_TLB:
1677         case BOND_MODE_ALB:
1678                 bond_set_active_slave(new_slave);
1679                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1680                 break;
1681         default:
1682                 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1683
1684                 /* always active in trunk mode */
1685                 bond_set_active_slave(new_slave);
1686
1687                 /* In trunking mode there is little meaning to curr_active_slave
1688                  * anyway (it holds no special properties of the bond device),
1689                  * so we can change it without calling change_active_interface()
1690                  */
1691                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1692                     new_slave->link == BOND_LINK_UP)
1693                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1694
1695                 break;
1696         } /* switch(bond_mode) */
1697
1698 #ifdef CONFIG_NET_POLL_CONTROLLER
1699         if (bond->dev->npinfo) {
1700                 if (slave_enable_netpoll(new_slave)) {
1701                         netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1702                         res = -EBUSY;
1703                         goto err_detach;
1704                 }
1705         }
1706 #endif
1707
1708         if (!(bond_dev->features & NETIF_F_LRO))
1709                 dev_disable_lro(slave_dev);
1710
1711         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1712                                          new_slave);
1713         if (res) {
1714                 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1715                 goto err_detach;
1716         }
1717
1718         res = bond_master_upper_dev_link(bond, new_slave, extack);
1719         if (res) {
1720                 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1721                 goto err_unregister;
1722         }
1723
1724         res = bond_sysfs_slave_add(new_slave);
1725         if (res) {
1726                 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1727                 goto err_upper_unlink;
1728         }
1729
1730         bond->nest_level = dev_get_nest_level(bond_dev) + 1;
1731
1732         /* If the mode uses primary, then the following is handled by
1733          * bond_change_active_slave().
1734          */
1735         if (!bond_uses_primary(bond)) {
1736                 /* set promiscuity level to new slave */
1737                 if (bond_dev->flags & IFF_PROMISC) {
1738                         res = dev_set_promiscuity(slave_dev, 1);
1739                         if (res)
1740                                 goto err_sysfs_del;
1741                 }
1742
1743                 /* set allmulti level to new slave */
1744                 if (bond_dev->flags & IFF_ALLMULTI) {
1745                         res = dev_set_allmulti(slave_dev, 1);
1746                         if (res) {
1747                                 if (bond_dev->flags & IFF_PROMISC)
1748                                         dev_set_promiscuity(slave_dev, -1);
1749                                 goto err_sysfs_del;
1750                         }
1751                 }
1752
1753                 netif_addr_lock_bh(bond_dev);
1754                 dev_mc_sync_multiple(slave_dev, bond_dev);
1755                 dev_uc_sync_multiple(slave_dev, bond_dev);
1756                 netif_addr_unlock_bh(bond_dev);
1757
1758                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1759                         /* add lacpdu mc addr to mc list */
1760                         u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1761
1762                         dev_mc_add(slave_dev, lacpdu_multicast);
1763                 }
1764         }
1765
1766         bond->slave_cnt++;
1767         bond_compute_features(bond);
1768         bond_set_carrier(bond);
1769
1770         if (bond_uses_primary(bond)) {
1771                 block_netpoll_tx();
1772                 bond_select_active_slave(bond);
1773                 unblock_netpoll_tx();
1774         }
1775
1776         if (bond_mode_can_use_xmit_hash(bond))
1777                 bond_update_slave_arr(bond, NULL);
1778
1779
1780         netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1781                     slave_dev->name,
1782                     bond_is_active_slave(new_slave) ? "an active" : "a backup",
1783                     new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1784
1785         /* enslave is successful */
1786         bond_queue_slave_event(new_slave);
1787         return 0;
1788
1789 /* Undo stages on error */
1790 err_sysfs_del:
1791         bond_sysfs_slave_del(new_slave);
1792
1793 err_upper_unlink:
1794         bond_upper_dev_unlink(bond, new_slave);
1795
1796 err_unregister:
1797         netdev_rx_handler_unregister(slave_dev);
1798
1799 err_detach:
1800         vlan_vids_del_by_dev(slave_dev, bond_dev);
1801         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1802                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1803         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1804                 block_netpoll_tx();
1805                 bond_change_active_slave(bond, NULL);
1806                 bond_select_active_slave(bond);
1807                 unblock_netpoll_tx();
1808         }
1809         /* either primary_slave or curr_active_slave might've changed */
1810         synchronize_rcu();
1811         slave_disable_netpoll(new_slave);
1812
1813 err_close:
1814         slave_dev->priv_flags &= ~IFF_BONDING;
1815         dev_close(slave_dev);
1816
1817 err_restore_mac:
1818         slave_dev->flags &= ~IFF_SLAVE;
1819         if (!bond->params.fail_over_mac ||
1820             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1821                 /* XXX TODO - fom follow mode needs to change master's
1822                  * MAC if this slave's MAC is in use by the bond, or at
1823                  * least print a warning.
1824                  */
1825                 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
1826                                   new_slave->dev->addr_len);
1827                 ss.ss_family = slave_dev->type;
1828                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
1829         }
1830
1831 err_restore_mtu:
1832         dev_set_mtu(slave_dev, new_slave->original_mtu);
1833
1834 err_free:
1835         bond_free_slave(new_slave);
1836
1837 err_undo_flags:
1838         /* Enslave of first slave has failed and we need to fix master's mac */
1839         if (!bond_has_slaves(bond)) {
1840                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1841                                             slave_dev->dev_addr))
1842                         eth_hw_addr_random(bond_dev);
1843                 if (bond_dev->type != ARPHRD_ETHER) {
1844                         dev_close(bond_dev);
1845                         ether_setup(bond_dev);
1846                         bond_dev->flags |= IFF_MASTER;
1847                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1848                 }
1849         }
1850
1851         return res;
1852 }
1853
1854 /* Try to release the slave device <slave> from the bond device <master>
1855  * It is legal to access curr_active_slave without a lock because all the function
1856  * is RTNL-locked. If "all" is true it means that the function is being called
1857  * while destroying a bond interface and all slaves are being released.
1858  *
1859  * The rules for slave state should be:
1860  *   for Active/Backup:
1861  *     Active stays on all backups go down
1862  *   for Bonded connections:
1863  *     The first up interface should be left on and all others downed.
1864  */
1865 static int __bond_release_one(struct net_device *bond_dev,
1866                               struct net_device *slave_dev,
1867                               bool all, bool unregister)
1868 {
1869         struct bonding *bond = netdev_priv(bond_dev);
1870         struct slave *slave, *oldcurrent;
1871         struct sockaddr_storage ss;
1872         int old_flags = bond_dev->flags;
1873         netdev_features_t old_features = bond_dev->features;
1874
1875         /* slave is not a slave or master is not master of this slave */
1876         if (!(slave_dev->flags & IFF_SLAVE) ||
1877             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1878                 netdev_dbg(bond_dev, "cannot release %s\n",
1879                            slave_dev->name);
1880                 return -EINVAL;
1881         }
1882
1883         block_netpoll_tx();
1884
1885         slave = bond_get_slave_by_dev(bond, slave_dev);
1886         if (!slave) {
1887                 /* not a slave of this bond */
1888                 netdev_info(bond_dev, "%s not enslaved\n",
1889                             slave_dev->name);
1890                 unblock_netpoll_tx();
1891                 return -EINVAL;
1892         }
1893
1894         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1895
1896         bond_sysfs_slave_del(slave);
1897
1898         /* recompute stats just before removing the slave */
1899         bond_get_stats(bond->dev, &bond->bond_stats);
1900
1901         bond_upper_dev_unlink(bond, slave);
1902         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1903          * for this slave anymore.
1904          */
1905         netdev_rx_handler_unregister(slave_dev);
1906
1907         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1908                 bond_3ad_unbind_slave(slave);
1909
1910         if (bond_mode_can_use_xmit_hash(bond))
1911                 bond_update_slave_arr(bond, slave);
1912
1913         netdev_info(bond_dev, "Releasing %s interface %s\n",
1914                     bond_is_active_slave(slave) ? "active" : "backup",
1915                     slave_dev->name);
1916
1917         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1918
1919         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1920
1921         if (!all && (!bond->params.fail_over_mac ||
1922                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1923                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1924                     bond_has_slaves(bond))
1925                         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",
1926                                     slave_dev->name, slave->perm_hwaddr,
1927                                     bond_dev->name, slave_dev->name);
1928         }
1929
1930         if (rtnl_dereference(bond->primary_slave) == slave)
1931                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1932
1933         if (oldcurrent == slave)
1934                 bond_change_active_slave(bond, NULL);
1935
1936         if (bond_is_lb(bond)) {
1937                 /* Must be called only after the slave has been
1938                  * detached from the list and the curr_active_slave
1939                  * has been cleared (if our_slave == old_current),
1940                  * but before a new active slave is selected.
1941                  */
1942                 bond_alb_deinit_slave(bond, slave);
1943         }
1944
1945         if (all) {
1946                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1947         } else if (oldcurrent == slave) {
1948                 /* Note that we hold RTNL over this sequence, so there
1949                  * is no concern that another slave add/remove event
1950                  * will interfere.
1951                  */
1952                 bond_select_active_slave(bond);
1953         }
1954
1955         if (!bond_has_slaves(bond)) {
1956                 bond_set_carrier(bond);
1957                 eth_hw_addr_random(bond_dev);
1958                 bond->nest_level = SINGLE_DEPTH_NESTING;
1959         } else {
1960                 bond->nest_level = dev_get_nest_level(bond_dev) + 1;
1961         }
1962
1963         unblock_netpoll_tx();
1964         synchronize_rcu();
1965         bond->slave_cnt--;
1966
1967         if (!bond_has_slaves(bond)) {
1968                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1969                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1970         }
1971
1972         bond_compute_features(bond);
1973         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1974             (old_features & NETIF_F_VLAN_CHALLENGED))
1975                 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1976                             slave_dev->name, bond_dev->name);
1977
1978         vlan_vids_del_by_dev(slave_dev, bond_dev);
1979
1980         /* If the mode uses primary, then this case was handled above by
1981          * bond_change_active_slave(..., NULL)
1982          */
1983         if (!bond_uses_primary(bond)) {
1984                 /* unset promiscuity level from slave
1985                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1986                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1987                  * value of that flag before that change, as that was the value
1988                  * when this slave was attached, so we cache at the start of the
1989                  * function and use it here. Same goes for ALLMULTI below
1990                  */
1991                 if (old_flags & IFF_PROMISC)
1992                         dev_set_promiscuity(slave_dev, -1);
1993
1994                 /* unset allmulti level from slave */
1995                 if (old_flags & IFF_ALLMULTI)
1996                         dev_set_allmulti(slave_dev, -1);
1997
1998                 bond_hw_addr_flush(bond_dev, slave_dev);
1999         }
2000
2001         slave_disable_netpoll(slave);
2002
2003         /* close slave before restoring its mac address */
2004         dev_close(slave_dev);
2005
2006         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2007             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2008                 /* restore original ("permanent") mac address */
2009                 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2010                                   slave->dev->addr_len);
2011                 ss.ss_family = slave_dev->type;
2012                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2013         }
2014
2015         if (unregister)
2016                 __dev_set_mtu(slave_dev, slave->original_mtu);
2017         else
2018                 dev_set_mtu(slave_dev, slave->original_mtu);
2019
2020         slave_dev->priv_flags &= ~IFF_BONDING;
2021
2022         bond_free_slave(slave);
2023
2024         return 0;
2025 }
2026
2027 /* A wrapper used because of ndo_del_link */
2028 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2029 {
2030         return __bond_release_one(bond_dev, slave_dev, false, false);
2031 }
2032
2033 /* First release a slave and then destroy the bond if no more slaves are left.
2034  * Must be under rtnl_lock when this function is called.
2035  */
2036 static int  bond_release_and_destroy(struct net_device *bond_dev,
2037                                      struct net_device *slave_dev)
2038 {
2039         struct bonding *bond = netdev_priv(bond_dev);
2040         int ret;
2041
2042         ret = __bond_release_one(bond_dev, slave_dev, false, true);
2043         if (ret == 0 && !bond_has_slaves(bond)) {
2044                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2045                 netdev_info(bond_dev, "Destroying bond %s\n",
2046                             bond_dev->name);
2047                 bond_remove_proc_entry(bond);
2048                 unregister_netdevice(bond_dev);
2049         }
2050         return ret;
2051 }
2052
2053 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2054 {
2055         struct bonding *bond = netdev_priv(bond_dev);
2056         bond_fill_ifbond(bond, info);
2057 }
2058
2059 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2060 {
2061         struct bonding *bond = netdev_priv(bond_dev);
2062         struct list_head *iter;
2063         int i = 0, res = -ENODEV;
2064         struct slave *slave;
2065
2066         bond_for_each_slave(bond, slave, iter) {
2067                 if (i++ == (int)info->slave_id) {
2068                         res = 0;
2069                         bond_fill_ifslave(slave, info);
2070                         break;
2071                 }
2072         }
2073
2074         return res;
2075 }
2076
2077 /*-------------------------------- Monitoring -------------------------------*/
2078
2079 /* called with rcu_read_lock() */
2080 static int bond_miimon_inspect(struct bonding *bond)
2081 {
2082         int link_state, commit = 0;
2083         struct list_head *iter;
2084         struct slave *slave;
2085         bool ignore_updelay;
2086
2087         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2088
2089         bond_for_each_slave_rcu(bond, slave, iter) {
2090                 slave->new_link = BOND_LINK_NOCHANGE;
2091                 slave->link_new_state = slave->link;
2092
2093                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2094
2095                 switch (slave->link) {
2096                 case BOND_LINK_UP:
2097                         if (link_state)
2098                                 continue;
2099
2100                         bond_propose_link_state(slave, BOND_LINK_FAIL);
2101                         commit++;
2102                         slave->delay = bond->params.downdelay;
2103                         if (slave->delay) {
2104                                 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2105                                             (BOND_MODE(bond) ==
2106                                              BOND_MODE_ACTIVEBACKUP) ?
2107                                              (bond_is_active_slave(slave) ?
2108                                               "active " : "backup ") : "",
2109                                             slave->dev->name,
2110                                             bond->params.downdelay * bond->params.miimon);
2111                         }
2112                         /*FALLTHRU*/
2113                 case BOND_LINK_FAIL:
2114                         if (link_state) {
2115                                 /* recovered before downdelay expired */
2116                                 bond_propose_link_state(slave, BOND_LINK_UP);
2117                                 slave->last_link_up = jiffies;
2118                                 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2119                                             (bond->params.downdelay - slave->delay) *
2120                                             bond->params.miimon,
2121                                             slave->dev->name);
2122                                 commit++;
2123                                 continue;
2124                         }
2125
2126                         if (slave->delay <= 0) {
2127                                 slave->new_link = BOND_LINK_DOWN;
2128                                 commit++;
2129                                 continue;
2130                         }
2131
2132                         slave->delay--;
2133                         break;
2134
2135                 case BOND_LINK_DOWN:
2136                         if (!link_state)
2137                                 continue;
2138
2139                         bond_propose_link_state(slave, BOND_LINK_BACK);
2140                         commit++;
2141                         slave->delay = bond->params.updelay;
2142
2143                         if (slave->delay) {
2144                                 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2145                                             slave->dev->name,
2146                                             ignore_updelay ? 0 :
2147                                             bond->params.updelay *
2148                                             bond->params.miimon);
2149                         }
2150                         /*FALLTHRU*/
2151                 case BOND_LINK_BACK:
2152                         if (!link_state) {
2153                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2154                                 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2155                                             (bond->params.updelay - slave->delay) *
2156                                             bond->params.miimon,
2157                                             slave->dev->name);
2158                                 commit++;
2159                                 continue;
2160                         }
2161
2162                         if (ignore_updelay)
2163                                 slave->delay = 0;
2164
2165                         if (slave->delay <= 0) {
2166                                 slave->new_link = BOND_LINK_UP;
2167                                 commit++;
2168                                 ignore_updelay = false;
2169                                 continue;
2170                         }
2171
2172                         slave->delay--;
2173                         break;
2174                 }
2175         }
2176
2177         return commit;
2178 }
2179
2180 static void bond_miimon_link_change(struct bonding *bond,
2181                                     struct slave *slave,
2182                                     char link)
2183 {
2184         switch (BOND_MODE(bond)) {
2185         case BOND_MODE_8023AD:
2186                 bond_3ad_handle_link_change(slave, link);
2187                 break;
2188         case BOND_MODE_TLB:
2189         case BOND_MODE_ALB:
2190                 bond_alb_handle_link_change(bond, slave, link);
2191                 break;
2192         case BOND_MODE_XOR:
2193                 bond_update_slave_arr(bond, NULL);
2194                 break;
2195         }
2196 }
2197
2198 static void bond_miimon_commit(struct bonding *bond)
2199 {
2200         struct list_head *iter;
2201         struct slave *slave, *primary;
2202
2203         bond_for_each_slave(bond, slave, iter) {
2204                 switch (slave->new_link) {
2205                 case BOND_LINK_NOCHANGE:
2206                         continue;
2207
2208                 case BOND_LINK_UP:
2209                         if (bond_update_speed_duplex(slave) &&
2210                             bond_needs_speed_duplex(bond)) {
2211                                 slave->link = BOND_LINK_DOWN;
2212                                 if (net_ratelimit())
2213                                         netdev_warn(bond->dev,
2214                                                     "failed to get link speed/duplex for %s\n",
2215                                                     slave->dev->name);
2216                                 continue;
2217                         }
2218                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2219                                                   BOND_SLAVE_NOTIFY_NOW);
2220                         slave->last_link_up = jiffies;
2221
2222                         primary = rtnl_dereference(bond->primary_slave);
2223                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2224                                 /* prevent it from being the active one */
2225                                 bond_set_backup_slave(slave);
2226                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2227                                 /* make it immediately active */
2228                                 bond_set_active_slave(slave);
2229                         } else if (slave != primary) {
2230                                 /* prevent it from being the active one */
2231                                 bond_set_backup_slave(slave);
2232                         }
2233
2234                         netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2235                                     slave->dev->name,
2236                                     slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2237                                     slave->duplex ? "full" : "half");
2238
2239                         bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2240
2241                         if (!bond->curr_active_slave || slave == primary)
2242                                 goto do_failover;
2243
2244                         continue;
2245
2246                 case BOND_LINK_DOWN:
2247                         if (slave->link_failure_count < UINT_MAX)
2248                                 slave->link_failure_count++;
2249
2250                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2251                                                   BOND_SLAVE_NOTIFY_NOW);
2252
2253                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2254                             BOND_MODE(bond) == BOND_MODE_8023AD)
2255                                 bond_set_slave_inactive_flags(slave,
2256                                                               BOND_SLAVE_NOTIFY_NOW);
2257
2258                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2259                                     slave->dev->name);
2260
2261                         bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2262
2263                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2264                                 goto do_failover;
2265
2266                         continue;
2267
2268                 default:
2269                         netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2270                                    slave->new_link, slave->dev->name);
2271                         slave->new_link = BOND_LINK_NOCHANGE;
2272
2273                         continue;
2274                 }
2275
2276 do_failover:
2277                 block_netpoll_tx();
2278                 bond_select_active_slave(bond);
2279                 unblock_netpoll_tx();
2280         }
2281
2282         bond_set_carrier(bond);
2283 }
2284
2285 /* bond_mii_monitor
2286  *
2287  * Really a wrapper that splits the mii monitor into two phases: an
2288  * inspection, then (if inspection indicates something needs to be done)
2289  * an acquisition of appropriate locks followed by a commit phase to
2290  * implement whatever link state changes are indicated.
2291  */
2292 static void bond_mii_monitor(struct work_struct *work)
2293 {
2294         struct bonding *bond = container_of(work, struct bonding,
2295                                             mii_work.work);
2296         bool should_notify_peers = false;
2297         unsigned long delay;
2298         struct slave *slave;
2299         struct list_head *iter;
2300
2301         delay = msecs_to_jiffies(bond->params.miimon);
2302
2303         if (!bond_has_slaves(bond))
2304                 goto re_arm;
2305
2306         rcu_read_lock();
2307
2308         should_notify_peers = bond_should_notify_peers(bond);
2309
2310         if (bond_miimon_inspect(bond)) {
2311                 rcu_read_unlock();
2312
2313                 /* Race avoidance with bond_close cancel of workqueue */
2314                 if (!rtnl_trylock()) {
2315                         delay = 1;
2316                         should_notify_peers = false;
2317                         goto re_arm;
2318                 }
2319
2320                 bond_for_each_slave(bond, slave, iter) {
2321                         bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2322                 }
2323                 bond_miimon_commit(bond);
2324
2325                 rtnl_unlock();  /* might sleep, hold no other locks */
2326         } else
2327                 rcu_read_unlock();
2328
2329 re_arm:
2330         if (bond->params.miimon)
2331                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2332
2333         if (should_notify_peers) {
2334                 if (!rtnl_trylock())
2335                         return;
2336                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2337                 rtnl_unlock();
2338         }
2339 }
2340
2341 static int bond_upper_dev_walk(struct net_device *upper, void *data)
2342 {
2343         __be32 ip = *((__be32 *)data);
2344
2345         return ip == bond_confirm_addr(upper, 0, ip);
2346 }
2347
2348 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2349 {
2350         bool ret = false;
2351
2352         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2353                 return true;
2354
2355         rcu_read_lock();
2356         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2357                 ret = true;
2358         rcu_read_unlock();
2359
2360         return ret;
2361 }
2362
2363 /* We go to the (large) trouble of VLAN tagging ARP frames because
2364  * switches in VLAN mode (especially if ports are configured as
2365  * "native" to a VLAN) might not pass non-tagged frames.
2366  */
2367 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2368                           __be32 dest_ip, __be32 src_ip,
2369                           struct bond_vlan_tag *tags)
2370 {
2371         struct sk_buff *skb;
2372         struct bond_vlan_tag *outer_tag = tags;
2373
2374         netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2375                    arp_op, slave_dev->name, &dest_ip, &src_ip);
2376
2377         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2378                          NULL, slave_dev->dev_addr, NULL);
2379
2380         if (!skb) {
2381                 net_err_ratelimited("ARP packet allocation failed\n");
2382                 return;
2383         }
2384
2385         if (!tags || tags->vlan_proto == VLAN_N_VID)
2386                 goto xmit;
2387
2388         tags++;
2389
2390         /* Go through all the tags backwards and add them to the packet */
2391         while (tags->vlan_proto != VLAN_N_VID) {
2392                 if (!tags->vlan_id) {
2393                         tags++;
2394                         continue;
2395                 }
2396
2397                 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2398                            ntohs(outer_tag->vlan_proto), tags->vlan_id);
2399                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2400                                                 tags->vlan_id);
2401                 if (!skb) {
2402                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2403                         return;
2404                 }
2405
2406                 tags++;
2407         }
2408         /* Set the outer tag */
2409         if (outer_tag->vlan_id) {
2410                 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2411                            ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2412                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2413                                        outer_tag->vlan_id);
2414         }
2415
2416 xmit:
2417         arp_xmit(skb);
2418 }
2419
2420 /* Validate the device path between the @start_dev and the @end_dev.
2421  * The path is valid if the @end_dev is reachable through device
2422  * stacking.
2423  * When the path is validated, collect any vlan information in the
2424  * path.
2425  */
2426 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2427                                               struct net_device *end_dev,
2428                                               int level)
2429 {
2430         struct bond_vlan_tag *tags;
2431         struct net_device *upper;
2432         struct list_head  *iter;
2433
2434         if (start_dev == end_dev) {
2435                 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2436                 if (!tags)
2437                         return ERR_PTR(-ENOMEM);
2438                 tags[level].vlan_proto = VLAN_N_VID;
2439                 return tags;
2440         }
2441
2442         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2443                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2444                 if (IS_ERR_OR_NULL(tags)) {
2445                         if (IS_ERR(tags))
2446                                 return tags;
2447                         continue;
2448                 }
2449                 if (is_vlan_dev(upper)) {
2450                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2451                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2452                 }
2453
2454                 return tags;
2455         }
2456
2457         return NULL;
2458 }
2459
2460 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2461 {
2462         struct rtable *rt;
2463         struct bond_vlan_tag *tags;
2464         __be32 *targets = bond->params.arp_targets, addr;
2465         int i;
2466
2467         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2468                 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2469                 tags = NULL;
2470
2471                 /* Find out through which dev should the packet go */
2472                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2473                                      RTO_ONLINK, 0);
2474                 if (IS_ERR(rt)) {
2475                         /* there's no route to target - try to send arp
2476                          * probe to generate any traffic (arp_validate=0)
2477                          */
2478                         if (bond->params.arp_validate)
2479                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2480                                                      bond->dev->name,
2481                                                      &targets[i]);
2482                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2483                                       0, tags);
2484                         continue;
2485                 }
2486
2487                 /* bond device itself */
2488                 if (rt->dst.dev == bond->dev)
2489                         goto found;
2490
2491                 rcu_read_lock();
2492                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2493                 rcu_read_unlock();
2494
2495                 if (!IS_ERR_OR_NULL(tags))
2496                         goto found;
2497
2498                 /* Not our device - skip */
2499                 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2500                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2501
2502                 ip_rt_put(rt);
2503                 continue;
2504
2505 found:
2506                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2507                 ip_rt_put(rt);
2508                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2509                               addr, tags);
2510                 kfree(tags);
2511         }
2512 }
2513
2514 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2515 {
2516         int i;
2517
2518         if (!sip || !bond_has_this_ip(bond, tip)) {
2519                 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2520                            &sip, &tip);
2521                 return;
2522         }
2523
2524         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2525         if (i == -1) {
2526                 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2527                            &sip);
2528                 return;
2529         }
2530         slave->last_rx = jiffies;
2531         slave->target_last_arp_rx[i] = jiffies;
2532 }
2533
2534 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2535                  struct slave *slave)
2536 {
2537         struct arphdr *arp = (struct arphdr *)skb->data;
2538         struct slave *curr_active_slave, *curr_arp_slave;
2539         unsigned char *arp_ptr;
2540         __be32 sip, tip;
2541         int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2542         unsigned int alen;
2543
2544         if (!slave_do_arp_validate(bond, slave)) {
2545                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2546                     !slave_do_arp_validate_only(bond))
2547                         slave->last_rx = jiffies;
2548                 return RX_HANDLER_ANOTHER;
2549         } else if (!is_arp) {
2550                 return RX_HANDLER_ANOTHER;
2551         }
2552
2553         alen = arp_hdr_len(bond->dev);
2554
2555         netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2556                    skb->dev->name);
2557
2558         if (alen > skb_headlen(skb)) {
2559                 arp = kmalloc(alen, GFP_ATOMIC);
2560                 if (!arp)
2561                         goto out_unlock;
2562                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2563                         goto out_unlock;
2564         }
2565
2566         if (arp->ar_hln != bond->dev->addr_len ||
2567             skb->pkt_type == PACKET_OTHERHOST ||
2568             skb->pkt_type == PACKET_LOOPBACK ||
2569             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2570             arp->ar_pro != htons(ETH_P_IP) ||
2571             arp->ar_pln != 4)
2572                 goto out_unlock;
2573
2574         arp_ptr = (unsigned char *)(arp + 1);
2575         arp_ptr += bond->dev->addr_len;
2576         memcpy(&sip, arp_ptr, 4);
2577         arp_ptr += 4 + bond->dev->addr_len;
2578         memcpy(&tip, arp_ptr, 4);
2579
2580         netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2581                    slave->dev->name, bond_slave_state(slave),
2582                      bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2583                      &sip, &tip);
2584
2585         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2586         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2587
2588         /* We 'trust' the received ARP enough to validate it if:
2589          *
2590          * (a) the slave receiving the ARP is active (which includes the
2591          * current ARP slave, if any), or
2592          *
2593          * (b) the receiving slave isn't active, but there is a currently
2594          * active slave and it received valid arp reply(s) after it became
2595          * the currently active slave, or
2596          *
2597          * (c) there is an ARP slave that sent an ARP during the prior ARP
2598          * interval, and we receive an ARP reply on any slave.  We accept
2599          * these because switch FDB update delays may deliver the ARP
2600          * reply to a slave other than the sender of the ARP request.
2601          *
2602          * Note: for (b), backup slaves are receiving the broadcast ARP
2603          * request, not a reply.  This request passes from the sending
2604          * slave through the L2 switch(es) to the receiving slave.  Since
2605          * this is checking the request, sip/tip are swapped for
2606          * validation.
2607          *
2608          * This is done to avoid endless looping when we can't reach the
2609          * arp_ip_target and fool ourselves with our own arp requests.
2610          */
2611         if (bond_is_active_slave(slave))
2612                 bond_validate_arp(bond, slave, sip, tip);
2613         else if (curr_active_slave &&
2614                  time_after(slave_last_rx(bond, curr_active_slave),
2615                             curr_active_slave->last_link_up))
2616                 bond_validate_arp(bond, slave, tip, sip);
2617         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2618                  bond_time_in_interval(bond,
2619                                        dev_trans_start(curr_arp_slave->dev), 1))
2620                 bond_validate_arp(bond, slave, sip, tip);
2621
2622 out_unlock:
2623         if (arp != (struct arphdr *)skb->data)
2624                 kfree(arp);
2625         return RX_HANDLER_ANOTHER;
2626 }
2627
2628 /* function to verify if we're in the arp_interval timeslice, returns true if
2629  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2630  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2631  */
2632 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2633                                   int mod)
2634 {
2635         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2636
2637         return time_in_range(jiffies,
2638                              last_act - delta_in_ticks,
2639                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2640 }
2641
2642 /* This function is called regularly to monitor each slave's link
2643  * ensuring that traffic is being sent and received when arp monitoring
2644  * is used in load-balancing mode. if the adapter has been dormant, then an
2645  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2646  * arp monitoring in active backup mode.
2647  */
2648 static void bond_loadbalance_arp_mon(struct bonding *bond)
2649 {
2650         struct slave *slave, *oldcurrent;
2651         struct list_head *iter;
2652         int do_failover = 0, slave_state_changed = 0;
2653
2654         if (!bond_has_slaves(bond))
2655                 goto re_arm;
2656
2657         rcu_read_lock();
2658
2659         oldcurrent = rcu_dereference(bond->curr_active_slave);
2660         /* see if any of the previous devices are up now (i.e. they have
2661          * xmt and rcv traffic). the curr_active_slave does not come into
2662          * the picture unless it is null. also, slave->last_link_up is not
2663          * needed here because we send an arp on each slave and give a slave
2664          * as long as it needs to get the tx/rx within the delta.
2665          * TODO: what about up/down delay in arp mode? it wasn't here before
2666          *       so it can wait
2667          */
2668         bond_for_each_slave_rcu(bond, slave, iter) {
2669                 unsigned long trans_start = dev_trans_start(slave->dev);
2670
2671                 slave->new_link = BOND_LINK_NOCHANGE;
2672
2673                 if (slave->link != BOND_LINK_UP) {
2674                         if (bond_time_in_interval(bond, trans_start, 1) &&
2675                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2676
2677                                 slave->new_link = BOND_LINK_UP;
2678                                 slave_state_changed = 1;
2679
2680                                 /* primary_slave has no meaning in round-robin
2681                                  * mode. the window of a slave being up and
2682                                  * curr_active_slave being null after enslaving
2683                                  * is closed.
2684                                  */
2685                                 if (!oldcurrent) {
2686                                         netdev_info(bond->dev, "link status definitely up for interface %s\n",
2687                                                     slave->dev->name);
2688                                         do_failover = 1;
2689                                 } else {
2690                                         netdev_info(bond->dev, "interface %s is now up\n",
2691                                                     slave->dev->name);
2692                                 }
2693                         }
2694                 } else {
2695                         /* slave->link == BOND_LINK_UP */
2696
2697                         /* not all switches will respond to an arp request
2698                          * when the source ip is 0, so don't take the link down
2699                          * if we don't know our ip yet
2700                          */
2701                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2702                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2703
2704                                 slave->new_link = BOND_LINK_DOWN;
2705                                 slave_state_changed = 1;
2706
2707                                 if (slave->link_failure_count < UINT_MAX)
2708                                         slave->link_failure_count++;
2709
2710                                 netdev_info(bond->dev, "interface %s is now down\n",
2711                                             slave->dev->name);
2712
2713                                 if (slave == oldcurrent)
2714                                         do_failover = 1;
2715                         }
2716                 }
2717
2718                 /* note: if switch is in round-robin mode, all links
2719                  * must tx arp to ensure all links rx an arp - otherwise
2720                  * links may oscillate or not come up at all; if switch is
2721                  * in something like xor mode, there is nothing we can
2722                  * do - all replies will be rx'ed on same link causing slaves
2723                  * to be unstable during low/no traffic periods
2724                  */
2725                 if (bond_slave_is_up(slave))
2726                         bond_arp_send_all(bond, slave);
2727         }
2728
2729         rcu_read_unlock();
2730
2731         if (do_failover || slave_state_changed) {
2732                 if (!rtnl_trylock())
2733                         goto re_arm;
2734
2735                 bond_for_each_slave(bond, slave, iter) {
2736                         if (slave->new_link != BOND_LINK_NOCHANGE)
2737                                 slave->link = slave->new_link;
2738                 }
2739
2740                 if (slave_state_changed) {
2741                         bond_slave_state_change(bond);
2742                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2743                                 bond_update_slave_arr(bond, NULL);
2744                 }
2745                 if (do_failover) {
2746                         block_netpoll_tx();
2747                         bond_select_active_slave(bond);
2748                         unblock_netpoll_tx();
2749                 }
2750                 rtnl_unlock();
2751         }
2752
2753 re_arm:
2754         if (bond->params.arp_interval)
2755                 queue_delayed_work(bond->wq, &bond->arp_work,
2756                                    msecs_to_jiffies(bond->params.arp_interval));
2757 }
2758
2759 /* Called to inspect slaves for active-backup mode ARP monitor link state
2760  * changes.  Sets new_link in slaves to specify what action should take
2761  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2762  * to link states must be committed.
2763  *
2764  * Called with rcu_read_lock held.
2765  */
2766 static int bond_ab_arp_inspect(struct bonding *bond)
2767 {
2768         unsigned long trans_start, last_rx;
2769         struct list_head *iter;
2770         struct slave *slave;
2771         int commit = 0;
2772
2773         bond_for_each_slave_rcu(bond, slave, iter) {
2774                 slave->new_link = BOND_LINK_NOCHANGE;
2775                 last_rx = slave_last_rx(bond, slave);
2776
2777                 if (slave->link != BOND_LINK_UP) {
2778                         if (bond_time_in_interval(bond, last_rx, 1)) {
2779                                 slave->new_link = BOND_LINK_UP;
2780                                 commit++;
2781                         }
2782                         continue;
2783                 }
2784
2785                 /* Give slaves 2*delta after being enslaved or made
2786                  * active.  This avoids bouncing, as the last receive
2787                  * times need a full ARP monitor cycle to be updated.
2788                  */
2789                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2790                         continue;
2791
2792                 /* Backup slave is down if:
2793                  * - No current_arp_slave AND
2794                  * - more than 3*delta since last receive AND
2795                  * - the bond has an IP address
2796                  *
2797                  * Note: a non-null current_arp_slave indicates
2798                  * the curr_active_slave went down and we are
2799                  * searching for a new one; under this condition
2800                  * we only take the curr_active_slave down - this
2801                  * gives each slave a chance to tx/rx traffic
2802                  * before being taken out
2803                  */
2804                 if (!bond_is_active_slave(slave) &&
2805                     !rcu_access_pointer(bond->current_arp_slave) &&
2806                     !bond_time_in_interval(bond, last_rx, 3)) {
2807                         slave->new_link = BOND_LINK_DOWN;
2808                         commit++;
2809                 }
2810
2811                 /* Active slave is down if:
2812                  * - more than 2*delta since transmitting OR
2813                  * - (more than 2*delta since receive AND
2814                  *    the bond has an IP address)
2815                  */
2816                 trans_start = dev_trans_start(slave->dev);
2817                 if (bond_is_active_slave(slave) &&
2818                     (!bond_time_in_interval(bond, trans_start, 2) ||
2819                      !bond_time_in_interval(bond, last_rx, 2))) {
2820                         slave->new_link = BOND_LINK_DOWN;
2821                         commit++;
2822                 }
2823         }
2824
2825         return commit;
2826 }
2827
2828 /* Called to commit link state changes noted by inspection step of
2829  * active-backup mode ARP monitor.
2830  *
2831  * Called with RTNL hold.
2832  */
2833 static void bond_ab_arp_commit(struct bonding *bond)
2834 {
2835         unsigned long trans_start;
2836         struct list_head *iter;
2837         struct slave *slave;
2838
2839         bond_for_each_slave(bond, slave, iter) {
2840                 switch (slave->new_link) {
2841                 case BOND_LINK_NOCHANGE:
2842                         continue;
2843
2844                 case BOND_LINK_UP:
2845                         trans_start = dev_trans_start(slave->dev);
2846                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2847                             (!rtnl_dereference(bond->curr_active_slave) &&
2848                              bond_time_in_interval(bond, trans_start, 1))) {
2849                                 struct slave *current_arp_slave;
2850
2851                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2852                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
2853                                                           BOND_SLAVE_NOTIFY_NOW);
2854                                 if (current_arp_slave) {
2855                                         bond_set_slave_inactive_flags(
2856                                                 current_arp_slave,
2857                                                 BOND_SLAVE_NOTIFY_NOW);
2858                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2859                                 }
2860
2861                                 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2862                                             slave->dev->name);
2863
2864                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2865                                     slave == rtnl_dereference(bond->primary_slave))
2866                                         goto do_failover;
2867
2868                         }
2869
2870                         continue;
2871
2872                 case BOND_LINK_DOWN:
2873                         if (slave->link_failure_count < UINT_MAX)
2874                                 slave->link_failure_count++;
2875
2876                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2877                                                   BOND_SLAVE_NOTIFY_NOW);
2878                         bond_set_slave_inactive_flags(slave,
2879                                                       BOND_SLAVE_NOTIFY_NOW);
2880
2881                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2882                                     slave->dev->name);
2883
2884                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2885                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2886                                 goto do_failover;
2887                         }
2888
2889                         continue;
2890
2891                 default:
2892                         netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2893                                    slave->new_link, slave->dev->name);
2894                         continue;
2895                 }
2896
2897 do_failover:
2898                 block_netpoll_tx();
2899                 bond_select_active_slave(bond);
2900                 unblock_netpoll_tx();
2901         }
2902
2903         bond_set_carrier(bond);
2904 }
2905
2906 /* Send ARP probes for active-backup mode ARP monitor.
2907  *
2908  * Called with rcu_read_lock held.
2909  */
2910 static bool bond_ab_arp_probe(struct bonding *bond)
2911 {
2912         struct slave *slave, *before = NULL, *new_slave = NULL,
2913                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2914                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2915         struct list_head *iter;
2916         bool found = false;
2917         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2918
2919         if (curr_arp_slave && curr_active_slave)
2920                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2921                             curr_arp_slave->dev->name,
2922                             curr_active_slave->dev->name);
2923
2924         if (curr_active_slave) {
2925                 bond_arp_send_all(bond, curr_active_slave);
2926                 return should_notify_rtnl;
2927         }
2928
2929         /* if we don't have a curr_active_slave, search for the next available
2930          * backup slave from the current_arp_slave and make it the candidate
2931          * for becoming the curr_active_slave
2932          */
2933
2934         if (!curr_arp_slave) {
2935                 curr_arp_slave = bond_first_slave_rcu(bond);
2936                 if (!curr_arp_slave)
2937                         return should_notify_rtnl;
2938         }
2939
2940         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2941
2942         bond_for_each_slave_rcu(bond, slave, iter) {
2943                 if (!found && !before && bond_slave_is_up(slave))
2944                         before = slave;
2945
2946                 if (found && !new_slave && bond_slave_is_up(slave))
2947                         new_slave = slave;
2948                 /* if the link state is up at this point, we
2949                  * mark it down - this can happen if we have
2950                  * simultaneous link failures and
2951                  * reselect_active_interface doesn't make this
2952                  * one the current slave so it is still marked
2953                  * up when it is actually down
2954                  */
2955                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2956                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2957                                                   BOND_SLAVE_NOTIFY_LATER);
2958                         if (slave->link_failure_count < UINT_MAX)
2959                                 slave->link_failure_count++;
2960
2961                         bond_set_slave_inactive_flags(slave,
2962                                                       BOND_SLAVE_NOTIFY_LATER);
2963
2964                         netdev_info(bond->dev, "backup interface %s is now down\n",
2965                                     slave->dev->name);
2966                 }
2967                 if (slave == curr_arp_slave)
2968                         found = true;
2969         }
2970
2971         if (!new_slave && before)
2972                 new_slave = before;
2973
2974         if (!new_slave)
2975                 goto check_state;
2976
2977         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2978                                   BOND_SLAVE_NOTIFY_LATER);
2979         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2980         bond_arp_send_all(bond, new_slave);
2981         new_slave->last_link_up = jiffies;
2982         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2983
2984 check_state:
2985         bond_for_each_slave_rcu(bond, slave, iter) {
2986                 if (slave->should_notify || slave->should_notify_link) {
2987                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2988                         break;
2989                 }
2990         }
2991         return should_notify_rtnl;
2992 }
2993
2994 static void bond_activebackup_arp_mon(struct bonding *bond)
2995 {
2996         bool should_notify_peers = false;
2997         bool should_notify_rtnl = false;
2998         int delta_in_ticks;
2999
3000         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3001
3002         if (!bond_has_slaves(bond))
3003                 goto re_arm;
3004
3005         rcu_read_lock();
3006
3007         should_notify_peers = bond_should_notify_peers(bond);
3008
3009         if (bond_ab_arp_inspect(bond)) {
3010                 rcu_read_unlock();
3011
3012                 /* Race avoidance with bond_close flush of workqueue */
3013                 if (!rtnl_trylock()) {
3014                         delta_in_ticks = 1;
3015                         should_notify_peers = false;
3016                         goto re_arm;
3017                 }
3018
3019                 bond_ab_arp_commit(bond);
3020
3021                 rtnl_unlock();
3022                 rcu_read_lock();
3023         }
3024
3025         should_notify_rtnl = bond_ab_arp_probe(bond);
3026         rcu_read_unlock();
3027
3028 re_arm:
3029         if (bond->params.arp_interval)
3030                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3031
3032         if (should_notify_peers || should_notify_rtnl) {
3033                 if (!rtnl_trylock())
3034                         return;
3035
3036                 if (should_notify_peers)
3037                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3038                                                  bond->dev);
3039                 if (should_notify_rtnl) {
3040                         bond_slave_state_notify(bond);
3041                         bond_slave_link_notify(bond);
3042                 }
3043
3044                 rtnl_unlock();
3045         }
3046 }
3047
3048 static void bond_arp_monitor(struct work_struct *work)
3049 {
3050         struct bonding *bond = container_of(work, struct bonding,
3051                                             arp_work.work);
3052
3053         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3054                 bond_activebackup_arp_mon(bond);
3055         else
3056                 bond_loadbalance_arp_mon(bond);
3057 }
3058
3059 /*-------------------------- netdev event handling --------------------------*/
3060
3061 /* Change device name */
3062 static int bond_event_changename(struct bonding *bond)
3063 {
3064         bond_remove_proc_entry(bond);
3065         bond_create_proc_entry(bond);
3066
3067         bond_debug_reregister(bond);
3068
3069         return NOTIFY_DONE;
3070 }
3071
3072 static int bond_master_netdev_event(unsigned long event,
3073                                     struct net_device *bond_dev)
3074 {
3075         struct bonding *event_bond = netdev_priv(bond_dev);
3076
3077         switch (event) {
3078         case NETDEV_CHANGENAME:
3079                 return bond_event_changename(event_bond);
3080         case NETDEV_UNREGISTER:
3081                 bond_remove_proc_entry(event_bond);
3082                 break;
3083         case NETDEV_REGISTER:
3084                 bond_create_proc_entry(event_bond);
3085                 break;
3086         case NETDEV_NOTIFY_PEERS:
3087                 if (event_bond->send_peer_notif)
3088                         event_bond->send_peer_notif--;
3089                 break;
3090         default:
3091                 break;
3092         }
3093
3094         return NOTIFY_DONE;
3095 }
3096
3097 static int bond_slave_netdev_event(unsigned long event,
3098                                    struct net_device *slave_dev)
3099 {
3100         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3101         struct bonding *bond;
3102         struct net_device *bond_dev;
3103
3104         /* A netdev event can be generated while enslaving a device
3105          * before netdev_rx_handler_register is called in which case
3106          * slave will be NULL
3107          */
3108         if (!slave)
3109                 return NOTIFY_DONE;
3110         bond_dev = slave->bond->dev;
3111         bond = slave->bond;
3112         primary = rtnl_dereference(bond->primary_slave);
3113
3114         switch (event) {
3115         case NETDEV_UNREGISTER:
3116                 if (bond_dev->type != ARPHRD_ETHER)
3117                         bond_release_and_destroy(bond_dev, slave_dev);
3118                 else
3119                         __bond_release_one(bond_dev, slave_dev, false, true);
3120                 break;
3121         case NETDEV_UP:
3122         case NETDEV_CHANGE:
3123                 /* For 802.3ad mode only:
3124                  * Getting invalid Speed/Duplex values here will put slave
3125                  * in weird state. So mark it as link-fail for the time
3126                  * being and let link-monitoring (miimon) set it right when
3127                  * correct speeds/duplex are available.
3128                  */
3129                 if (bond_update_speed_duplex(slave) &&
3130                     BOND_MODE(bond) == BOND_MODE_8023AD)
3131                         slave->link = BOND_LINK_FAIL;
3132
3133                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3134                         bond_3ad_adapter_speed_duplex_changed(slave);
3135                 /* Fallthrough */
3136         case NETDEV_DOWN:
3137                 /* Refresh slave-array if applicable!
3138                  * If the setup does not use miimon or arpmon (mode-specific!),
3139                  * then these events will not cause the slave-array to be
3140                  * refreshed. This will cause xmit to use a slave that is not
3141                  * usable. Avoid such situation by refeshing the array at these
3142                  * events. If these (miimon/arpmon) parameters are configured
3143                  * then array gets refreshed twice and that should be fine!
3144                  */
3145                 if (bond_mode_can_use_xmit_hash(bond))
3146                         bond_update_slave_arr(bond, NULL);
3147                 break;
3148         case NETDEV_CHANGEMTU:
3149                 /* TODO: Should slaves be allowed to
3150                  * independently alter their MTU?  For
3151                  * an active-backup bond, slaves need
3152                  * not be the same type of device, so
3153                  * MTUs may vary.  For other modes,
3154                  * slaves arguably should have the
3155                  * same MTUs. To do this, we'd need to
3156                  * take over the slave's change_mtu
3157                  * function for the duration of their
3158                  * servitude.
3159                  */
3160                 break;
3161         case NETDEV_CHANGENAME:
3162                 /* we don't care if we don't have primary set */
3163                 if (!bond_uses_primary(bond) ||
3164                     !bond->params.primary[0])
3165                         break;
3166
3167                 if (slave == primary) {
3168                         /* slave's name changed - he's no longer primary */
3169                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3170                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3171                         /* we have a new primary slave */
3172                         rcu_assign_pointer(bond->primary_slave, slave);
3173                 } else { /* we didn't change primary - exit */
3174                         break;
3175                 }
3176
3177                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3178                             primary ? slave_dev->name : "none");
3179
3180                 block_netpoll_tx();
3181                 bond_select_active_slave(bond);
3182                 unblock_netpoll_tx();
3183                 break;
3184         case NETDEV_FEAT_CHANGE:
3185                 bond_compute_features(bond);
3186                 break;
3187         case NETDEV_RESEND_IGMP:
3188                 /* Propagate to master device */
3189                 call_netdevice_notifiers(event, slave->bond->dev);
3190                 break;
3191         default:
3192                 break;
3193         }
3194
3195         return NOTIFY_DONE;
3196 }
3197
3198 /* bond_netdev_event: handle netdev notifier chain events.
3199  *
3200  * This function receives events for the netdev chain.  The caller (an
3201  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3202  * locks for us to safely manipulate the slave devices (RTNL lock,
3203  * dev_probe_lock).
3204  */
3205 static int bond_netdev_event(struct notifier_block *this,
3206                              unsigned long event, void *ptr)
3207 {
3208         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3209
3210         netdev_dbg(event_dev, "event: %lx\n", event);
3211
3212         if (!(event_dev->priv_flags & IFF_BONDING))
3213                 return NOTIFY_DONE;
3214
3215         if (event_dev->flags & IFF_MASTER) {
3216                 netdev_dbg(event_dev, "IFF_MASTER\n");
3217                 return bond_master_netdev_event(event, event_dev);
3218         }
3219
3220         if (event_dev->flags & IFF_SLAVE) {
3221                 netdev_dbg(event_dev, "IFF_SLAVE\n");
3222                 return bond_slave_netdev_event(event, event_dev);
3223         }
3224
3225         return NOTIFY_DONE;
3226 }
3227
3228 static struct notifier_block bond_netdev_notifier = {
3229         .notifier_call = bond_netdev_event,
3230 };
3231
3232 /*---------------------------- Hashing Policies -----------------------------*/
3233
3234 /* L2 hash helper */
3235 static inline u32 bond_eth_hash(struct sk_buff *skb)
3236 {
3237         struct ethhdr *ep, hdr_tmp;
3238
3239         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3240         if (ep)
3241                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3242         return 0;
3243 }
3244
3245 /* Extract the appropriate headers based on bond's xmit policy */
3246 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3247                               struct flow_keys *fk)
3248 {
3249         const struct ipv6hdr *iph6;
3250         const struct iphdr *iph;
3251         int noff, proto = -1;
3252
3253         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3254                 return skb_flow_dissect_flow_keys(skb, fk, 0);
3255
3256         fk->ports.ports = 0;
3257         noff = skb_network_offset(skb);
3258         if (skb->protocol == htons(ETH_P_IP)) {
3259                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3260                         return false;
3261                 iph = ip_hdr(skb);
3262                 iph_to_flow_copy_v4addrs(fk, iph);
3263                 noff += iph->ihl << 2;
3264                 if (!ip_is_fragment(iph))
3265                         proto = iph->protocol;
3266         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3267                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3268                         return false;
3269                 iph6 = ipv6_hdr(skb);
3270                 iph_to_flow_copy_v6addrs(fk, iph6);
3271                 noff += sizeof(*iph6);
3272                 proto = iph6->nexthdr;
3273         } else {
3274                 return false;
3275         }
3276         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3277                 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3278
3279         return true;
3280 }
3281
3282 /**
3283  * bond_xmit_hash - generate a hash value based on the xmit policy
3284  * @bond: bonding device
3285  * @skb: buffer to use for headers
3286  *
3287  * This function will extract the necessary headers from the skb buffer and use
3288  * them to generate a hash based on the xmit_policy set in the bonding device
3289  */
3290 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3291 {
3292         struct flow_keys flow;
3293         u32 hash;
3294
3295         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3296             skb->l4_hash)
3297                 return skb->hash;
3298
3299         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3300             !bond_flow_dissect(bond, skb, &flow))
3301                 return bond_eth_hash(skb);
3302
3303         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3304             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3305                 hash = bond_eth_hash(skb);
3306         else
3307                 hash = (__force u32)flow.ports.ports;
3308         hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3309                 (__force u32)flow_get_u32_src(&flow);
3310         hash ^= (hash >> 16);
3311         hash ^= (hash >> 8);
3312
3313         return hash >> 1;
3314 }
3315
3316 /*-------------------------- Device entry points ----------------------------*/
3317
3318 void bond_work_init_all(struct bonding *bond)
3319 {
3320         INIT_DELAYED_WORK(&bond->mcast_work,
3321                           bond_resend_igmp_join_requests_delayed);
3322         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3323         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3324         INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3325         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3326         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3327 }
3328
3329 static void bond_work_cancel_all(struct bonding *bond)
3330 {
3331         cancel_delayed_work_sync(&bond->mii_work);
3332         cancel_delayed_work_sync(&bond->arp_work);
3333         cancel_delayed_work_sync(&bond->alb_work);
3334         cancel_delayed_work_sync(&bond->ad_work);
3335         cancel_delayed_work_sync(&bond->mcast_work);
3336         cancel_delayed_work_sync(&bond->slave_arr_work);
3337 }
3338
3339 static int bond_open(struct net_device *bond_dev)
3340 {
3341         struct bonding *bond = netdev_priv(bond_dev);
3342         struct list_head *iter;
3343         struct slave *slave;
3344
3345         /* reset slave->backup and slave->inactive */
3346         if (bond_has_slaves(bond)) {
3347                 bond_for_each_slave(bond, slave, iter) {
3348                         if (bond_uses_primary(bond) &&
3349                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3350                                 bond_set_slave_inactive_flags(slave,
3351                                                               BOND_SLAVE_NOTIFY_NOW);
3352                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3353                                 bond_set_slave_active_flags(slave,
3354                                                             BOND_SLAVE_NOTIFY_NOW);
3355                         }
3356                 }
3357         }
3358
3359         if (bond_is_lb(bond)) {
3360                 /* bond_alb_initialize must be called before the timer
3361                  * is started.
3362                  */
3363                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3364                         return -ENOMEM;
3365                 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3366                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3367         }
3368
3369         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3370                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3371
3372         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3373                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3374                 bond->recv_probe = bond_arp_rcv;
3375         }
3376
3377         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3378                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3379                 /* register to receive LACPDUs */
3380                 bond->recv_probe = bond_3ad_lacpdu_recv;
3381                 bond_3ad_initiate_agg_selection(bond, 1);
3382         }
3383
3384         if (bond_mode_can_use_xmit_hash(bond))
3385                 bond_update_slave_arr(bond, NULL);
3386
3387         return 0;
3388 }
3389
3390 static int bond_close(struct net_device *bond_dev)
3391 {
3392         struct bonding *bond = netdev_priv(bond_dev);
3393
3394         bond_work_cancel_all(bond);
3395         bond->send_peer_notif = 0;
3396         if (bond_is_lb(bond))
3397                 bond_alb_deinitialize(bond);
3398         bond->recv_probe = NULL;
3399
3400         return 0;
3401 }
3402
3403 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3404  * that some drivers can provide 32bit values only.
3405  */
3406 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3407                             const struct rtnl_link_stats64 *_new,
3408                             const struct rtnl_link_stats64 *_old)
3409 {
3410         const u64 *new = (const u64 *)_new;
3411         const u64 *old = (const u64 *)_old;
3412         u64 *res = (u64 *)_res;
3413         int i;
3414
3415         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3416                 u64 nv = new[i];
3417                 u64 ov = old[i];
3418                 s64 delta = nv - ov;
3419
3420                 /* detects if this particular field is 32bit only */
3421                 if (((nv | ov) >> 32) == 0)
3422                         delta = (s64)(s32)((u32)nv - (u32)ov);
3423
3424                 /* filter anomalies, some drivers reset their stats
3425                  * at down/up events.
3426                  */
3427                 if (delta > 0)
3428                         res[i] += delta;
3429         }
3430 }
3431
3432 static int bond_get_nest_level(struct net_device *bond_dev)
3433 {
3434         struct bonding *bond = netdev_priv(bond_dev);
3435
3436         return bond->nest_level;
3437 }
3438
3439 static void bond_get_stats(struct net_device *bond_dev,
3440                            struct rtnl_link_stats64 *stats)
3441 {
3442         struct bonding *bond = netdev_priv(bond_dev);
3443         struct rtnl_link_stats64 temp;
3444         struct list_head *iter;
3445         struct slave *slave;
3446
3447         spin_lock_nested(&bond->stats_lock, bond_get_nest_level(bond_dev));
3448         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3449
3450         rcu_read_lock();
3451         bond_for_each_slave_rcu(bond, slave, iter) {
3452                 const struct rtnl_link_stats64 *new =
3453                         dev_get_stats(slave->dev, &temp);
3454
3455                 bond_fold_stats(stats, new, &slave->slave_stats);
3456
3457                 /* save off the slave stats for the next run */
3458                 memcpy(&slave->slave_stats, new, sizeof(*new));
3459         }
3460         rcu_read_unlock();
3461
3462         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3463         spin_unlock(&bond->stats_lock);
3464 }
3465
3466 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3467 {
3468         struct bonding *bond = netdev_priv(bond_dev);
3469         struct net_device *slave_dev = NULL;
3470         struct ifbond k_binfo;
3471         struct ifbond __user *u_binfo = NULL;
3472         struct ifslave k_sinfo;
3473         struct ifslave __user *u_sinfo = NULL;
3474         struct mii_ioctl_data *mii = NULL;
3475         struct bond_opt_value newval;
3476         struct net *net;
3477         int res = 0;
3478
3479         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3480
3481         switch (cmd) {
3482         case SIOCGMIIPHY:
3483                 mii = if_mii(ifr);
3484                 if (!mii)
3485                         return -EINVAL;
3486
3487                 mii->phy_id = 0;
3488                 /* Fall Through */
3489         case SIOCGMIIREG:
3490                 /* We do this again just in case we were called by SIOCGMIIREG
3491                  * instead of SIOCGMIIPHY.
3492                  */
3493                 mii = if_mii(ifr);
3494                 if (!mii)
3495                         return -EINVAL;
3496
3497                 if (mii->reg_num == 1) {
3498                         mii->val_out = 0;
3499                         if (netif_carrier_ok(bond->dev))
3500                                 mii->val_out = BMSR_LSTATUS;
3501                 }
3502
3503                 return 0;
3504         case BOND_INFO_QUERY_OLD:
3505         case SIOCBONDINFOQUERY:
3506                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3507
3508                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3509                         return -EFAULT;
3510
3511                 bond_info_query(bond_dev, &k_binfo);
3512                 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3513                         return -EFAULT;
3514
3515                 return 0;
3516         case BOND_SLAVE_INFO_QUERY_OLD:
3517         case SIOCBONDSLAVEINFOQUERY:
3518                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3519
3520                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3521                         return -EFAULT;
3522
3523                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3524                 if (res == 0 &&
3525                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3526                         return -EFAULT;
3527
3528                 return res;
3529         default:
3530                 break;
3531         }
3532
3533         net = dev_net(bond_dev);
3534
3535         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3536                 return -EPERM;
3537
3538         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3539
3540         netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3541
3542         if (!slave_dev)
3543                 return -ENODEV;
3544
3545         netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3546         switch (cmd) {
3547         case BOND_ENSLAVE_OLD:
3548         case SIOCBONDENSLAVE:
3549                 res = bond_enslave(bond_dev, slave_dev, NULL);
3550                 break;
3551         case BOND_RELEASE_OLD:
3552         case SIOCBONDRELEASE:
3553                 res = bond_release(bond_dev, slave_dev);
3554                 break;
3555         case BOND_SETHWADDR_OLD:
3556         case SIOCBONDSETHWADDR:
3557                 res = bond_set_dev_addr(bond_dev, slave_dev);
3558                 break;
3559         case BOND_CHANGE_ACTIVE_OLD:
3560         case SIOCBONDCHANGEACTIVE:
3561                 bond_opt_initstr(&newval, slave_dev->name);
3562                 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3563                                             &newval);
3564                 break;
3565         default:
3566                 res = -EOPNOTSUPP;
3567         }
3568
3569         return res;
3570 }
3571
3572 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3573 {
3574         struct bonding *bond = netdev_priv(bond_dev);
3575
3576         if (change & IFF_PROMISC)
3577                 bond_set_promiscuity(bond,
3578                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3579
3580         if (change & IFF_ALLMULTI)
3581                 bond_set_allmulti(bond,
3582                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3583 }
3584
3585 static void bond_set_rx_mode(struct net_device *bond_dev)
3586 {
3587         struct bonding *bond = netdev_priv(bond_dev);
3588         struct list_head *iter;
3589         struct slave *slave;
3590
3591         rcu_read_lock();
3592         if (bond_uses_primary(bond)) {
3593                 slave = rcu_dereference(bond->curr_active_slave);
3594                 if (slave) {
3595                         dev_uc_sync(slave->dev, bond_dev);
3596                         dev_mc_sync(slave->dev, bond_dev);
3597                 }
3598         } else {
3599                 bond_for_each_slave_rcu(bond, slave, iter) {
3600                         dev_uc_sync_multiple(slave->dev, bond_dev);
3601                         dev_mc_sync_multiple(slave->dev, bond_dev);
3602                 }
3603         }
3604         rcu_read_unlock();
3605 }
3606
3607 static int bond_neigh_init(struct neighbour *n)
3608 {
3609         struct bonding *bond = netdev_priv(n->dev);
3610         const struct net_device_ops *slave_ops;
3611         struct neigh_parms parms;
3612         struct slave *slave;
3613         int ret;
3614
3615         slave = bond_first_slave(bond);
3616         if (!slave)
3617                 return 0;
3618         slave_ops = slave->dev->netdev_ops;
3619         if (!slave_ops->ndo_neigh_setup)
3620                 return 0;
3621
3622         parms.neigh_setup = NULL;
3623         parms.neigh_cleanup = NULL;
3624         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3625         if (ret)
3626                 return ret;
3627
3628         /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3629          * after the last slave has been detached.  Assumes that all slaves
3630          * utilize the same neigh_cleanup (true at this writing as only user
3631          * is ipoib).
3632          */
3633         n->parms->neigh_cleanup = parms.neigh_cleanup;
3634
3635         if (!parms.neigh_setup)
3636                 return 0;
3637
3638         return parms.neigh_setup(n);
3639 }
3640
3641 /* The bonding ndo_neigh_setup is called at init time beofre any
3642  * slave exists. So we must declare proxy setup function which will
3643  * be used at run time to resolve the actual slave neigh param setup.
3644  *
3645  * It's also called by master devices (such as vlans) to setup their
3646  * underlying devices. In that case - do nothing, we're already set up from
3647  * our init.
3648  */
3649 static int bond_neigh_setup(struct net_device *dev,
3650                             struct neigh_parms *parms)
3651 {
3652         /* modify only our neigh_parms */
3653         if (parms->dev == dev)
3654                 parms->neigh_setup = bond_neigh_init;
3655
3656         return 0;
3657 }
3658
3659 /* Change the MTU of all of a master's slaves to match the master */
3660 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3661 {
3662         struct bonding *bond = netdev_priv(bond_dev);
3663         struct slave *slave, *rollback_slave;
3664         struct list_head *iter;
3665         int res = 0;
3666
3667         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3668
3669         bond_for_each_slave(bond, slave, iter) {
3670                 netdev_dbg(bond_dev, "s %p c_m %p\n",
3671                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3672
3673                 res = dev_set_mtu(slave->dev, new_mtu);
3674
3675                 if (res) {
3676                         /* If we failed to set the slave's mtu to the new value
3677                          * we must abort the operation even in ACTIVE_BACKUP
3678                          * mode, because if we allow the backup slaves to have
3679                          * different mtu values than the active slave we'll
3680                          * need to change their mtu when doing a failover. That
3681                          * means changing their mtu from timer context, which
3682                          * is probably not a good idea.
3683                          */
3684                         netdev_dbg(bond_dev, "err %d %s\n", res,
3685                                    slave->dev->name);
3686                         goto unwind;
3687                 }
3688         }
3689
3690         bond_dev->mtu = new_mtu;
3691
3692         return 0;
3693
3694 unwind:
3695         /* unwind from head to the slave that failed */
3696         bond_for_each_slave(bond, rollback_slave, iter) {
3697                 int tmp_res;
3698
3699                 if (rollback_slave == slave)
3700                         break;
3701
3702                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3703                 if (tmp_res) {
3704                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3705                                    tmp_res, rollback_slave->dev->name);
3706                 }
3707         }
3708
3709         return res;
3710 }
3711
3712 /* Change HW address
3713  *
3714  * Note that many devices must be down to change the HW address, and
3715  * downing the master releases all slaves.  We can make bonds full of
3716  * bonding devices to test this, however.
3717  */
3718 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3719 {
3720         struct bonding *bond = netdev_priv(bond_dev);
3721         struct slave *slave, *rollback_slave;
3722         struct sockaddr_storage *ss = addr, tmp_ss;
3723         struct list_head *iter;
3724         int res = 0;
3725
3726         if (BOND_MODE(bond) == BOND_MODE_ALB)
3727                 return bond_alb_set_mac_address(bond_dev, addr);
3728
3729
3730         netdev_dbg(bond_dev, "bond=%p\n", bond);
3731
3732         /* If fail_over_mac is enabled, do nothing and return success.
3733          * Returning an error causes ifenslave to fail.
3734          */
3735         if (bond->params.fail_over_mac &&
3736             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3737                 return 0;
3738
3739         if (!is_valid_ether_addr(ss->__data))
3740                 return -EADDRNOTAVAIL;
3741
3742         bond_for_each_slave(bond, slave, iter) {
3743                 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3744                 res = dev_set_mac_address(slave->dev, addr, NULL);
3745                 if (res) {
3746                         /* TODO: consider downing the slave
3747                          * and retry ?
3748                          * User should expect communications
3749                          * breakage anyway until ARP finish
3750                          * updating, so...
3751                          */
3752                         netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3753                         goto unwind;
3754                 }
3755         }
3756
3757         /* success */
3758         memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
3759         return 0;
3760
3761 unwind:
3762         memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
3763         tmp_ss.ss_family = bond_dev->type;
3764
3765         /* unwind from head to the slave that failed */
3766         bond_for_each_slave(bond, rollback_slave, iter) {
3767                 int tmp_res;
3768
3769                 if (rollback_slave == slave)
3770                         break;
3771
3772                 tmp_res = dev_set_mac_address(rollback_slave->dev,
3773                                               (struct sockaddr *)&tmp_ss, NULL);
3774                 if (tmp_res) {
3775                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3776                                    tmp_res, rollback_slave->dev->name);
3777                 }
3778         }
3779
3780         return res;
3781 }
3782
3783 /**
3784  * bond_xmit_slave_id - transmit skb through slave with slave_id
3785  * @bond: bonding device that is transmitting
3786  * @skb: buffer to transmit
3787  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3788  *
3789  * This function tries to transmit through slave with slave_id but in case
3790  * it fails, it tries to find the first available slave for transmission.
3791  * The skb is consumed in all cases, thus the function is void.
3792  */
3793 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3794 {
3795         struct list_head *iter;
3796         struct slave *slave;
3797         int i = slave_id;
3798
3799         /* Here we start from the slave with slave_id */
3800         bond_for_each_slave_rcu(bond, slave, iter) {
3801                 if (--i < 0) {
3802                         if (bond_slave_can_tx(slave)) {
3803                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3804                                 return;
3805                         }
3806                 }
3807         }
3808
3809         /* Here we start from the first slave up to slave_id */
3810         i = slave_id;
3811         bond_for_each_slave_rcu(bond, slave, iter) {
3812                 if (--i < 0)
3813                         break;
3814                 if (bond_slave_can_tx(slave)) {
3815                         bond_dev_queue_xmit(bond, skb, slave->dev);
3816                         return;
3817                 }
3818         }
3819         /* no slave that can tx has been found */
3820         bond_tx_drop(bond->dev, skb);
3821 }
3822
3823 /**
3824  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3825  * @bond: bonding device to use
3826  *
3827  * Based on the value of the bonding device's packets_per_slave parameter
3828  * this function generates a slave id, which is usually used as the next
3829  * slave to transmit through.
3830  */
3831 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3832 {
3833         u32 slave_id;
3834         struct reciprocal_value reciprocal_packets_per_slave;
3835         int packets_per_slave = bond->params.packets_per_slave;
3836
3837         switch (packets_per_slave) {
3838         case 0:
3839                 slave_id = prandom_u32();
3840                 break;
3841         case 1:
3842                 slave_id = bond->rr_tx_counter;
3843                 break;
3844         default:
3845                 reciprocal_packets_per_slave =
3846                         bond->params.reciprocal_packets_per_slave;
3847                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3848                                              reciprocal_packets_per_slave);
3849                 break;
3850         }
3851         bond->rr_tx_counter++;
3852
3853         return slave_id;
3854 }
3855
3856 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
3857                                         struct net_device *bond_dev)
3858 {
3859         struct bonding *bond = netdev_priv(bond_dev);
3860         struct iphdr *iph = ip_hdr(skb);
3861         struct slave *slave;
3862         u32 slave_id;
3863
3864         /* Start with the curr_active_slave that joined the bond as the
3865          * default for sending IGMP traffic.  For failover purposes one
3866          * needs to maintain some consistency for the interface that will
3867          * send the join/membership reports.  The curr_active_slave found
3868          * will send all of this type of traffic.
3869          */
3870         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3871                 slave = rcu_dereference(bond->curr_active_slave);
3872                 if (slave)
3873                         bond_dev_queue_xmit(bond, skb, slave->dev);
3874                 else
3875                         bond_xmit_slave_id(bond, skb, 0);
3876         } else {
3877                 int slave_cnt = READ_ONCE(bond->slave_cnt);
3878
3879                 if (likely(slave_cnt)) {
3880                         slave_id = bond_rr_gen_slave_id(bond);
3881                         bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3882                 } else {
3883                         bond_tx_drop(bond_dev, skb);
3884                 }
3885         }
3886
3887         return NETDEV_TX_OK;
3888 }
3889
3890 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3891  * the bond has a usable interface.
3892  */
3893 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
3894                                           struct net_device *bond_dev)
3895 {
3896         struct bonding *bond = netdev_priv(bond_dev);
3897         struct slave *slave;
3898
3899         slave = rcu_dereference(bond->curr_active_slave);
3900         if (slave)
3901                 bond_dev_queue_xmit(bond, skb, slave->dev);
3902         else
3903                 bond_tx_drop(bond_dev, skb);
3904
3905         return NETDEV_TX_OK;
3906 }
3907
3908 /* Use this to update slave_array when (a) it's not appropriate to update
3909  * slave_array right away (note that update_slave_array() may sleep)
3910  * and / or (b) RTNL is not held.
3911  */
3912 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3913 {
3914         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3915 }
3916
3917 /* Slave array work handler. Holds only RTNL */
3918 static void bond_slave_arr_handler(struct work_struct *work)
3919 {
3920         struct bonding *bond = container_of(work, struct bonding,
3921                                             slave_arr_work.work);
3922         int ret;
3923
3924         if (!rtnl_trylock())
3925                 goto err;
3926
3927         ret = bond_update_slave_arr(bond, NULL);
3928         rtnl_unlock();
3929         if (ret) {
3930                 pr_warn_ratelimited("Failed to update slave array from WT\n");
3931                 goto err;
3932         }
3933         return;
3934
3935 err:
3936         bond_slave_arr_work_rearm(bond, 1);
3937 }
3938
3939 /* Build the usable slaves array in control path for modes that use xmit-hash
3940  * to determine the slave interface -
3941  * (a) BOND_MODE_8023AD
3942  * (b) BOND_MODE_XOR
3943  * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
3944  *
3945  * The caller is expected to hold RTNL only and NO other lock!
3946  */
3947 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3948 {
3949         struct slave *slave;
3950         struct list_head *iter;
3951         struct bond_up_slave *new_arr, *old_arr;
3952         int agg_id = 0;
3953         int ret = 0;
3954
3955 #ifdef CONFIG_LOCKDEP
3956         WARN_ON(lockdep_is_held(&bond->mode_lock));
3957 #endif
3958
3959         new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3960                           GFP_KERNEL);
3961         if (!new_arr) {
3962                 ret = -ENOMEM;
3963                 pr_err("Failed to build slave-array.\n");
3964                 goto out;
3965         }
3966         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3967                 struct ad_info ad_info;
3968
3969                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3970                         pr_debug("bond_3ad_get_active_agg_info failed\n");
3971                         kfree_rcu(new_arr, rcu);
3972                         /* No active aggragator means it's not safe to use
3973                          * the previous array.
3974                          */
3975                         old_arr = rtnl_dereference(bond->slave_arr);
3976                         if (old_arr) {
3977                                 RCU_INIT_POINTER(bond->slave_arr, NULL);
3978                                 kfree_rcu(old_arr, rcu);
3979                         }
3980                         goto out;
3981                 }
3982                 agg_id = ad_info.aggregator_id;
3983         }
3984         bond_for_each_slave(bond, slave, iter) {
3985                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3986                         struct aggregator *agg;
3987
3988                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
3989                         if (!agg || agg->aggregator_identifier != agg_id)
3990                                 continue;
3991                 }
3992                 if (!bond_slave_can_tx(slave))
3993                         continue;
3994                 if (skipslave == slave)
3995                         continue;
3996
3997                 netdev_dbg(bond->dev,
3998                            "Adding slave dev %s to tx hash array[%d]\n",
3999                            slave->dev->name, new_arr->count);
4000
4001                 new_arr->arr[new_arr->count++] = slave;
4002         }
4003
4004         old_arr = rtnl_dereference(bond->slave_arr);
4005         rcu_assign_pointer(bond->slave_arr, new_arr);
4006         if (old_arr)
4007                 kfree_rcu(old_arr, rcu);
4008 out:
4009         if (ret != 0 && skipslave) {
4010                 int idx;
4011
4012                 /* Rare situation where caller has asked to skip a specific
4013                  * slave but allocation failed (most likely!). BTW this is
4014                  * only possible when the call is initiated from
4015                  * __bond_release_one(). In this situation; overwrite the
4016                  * skipslave entry in the array with the last entry from the
4017                  * array to avoid a situation where the xmit path may choose
4018                  * this to-be-skipped slave to send a packet out.
4019                  */
4020                 old_arr = rtnl_dereference(bond->slave_arr);
4021                 for (idx = 0; idx < old_arr->count; idx++) {
4022                         if (skipslave == old_arr->arr[idx]) {
4023                                 old_arr->arr[idx] =
4024                                     old_arr->arr[old_arr->count-1];
4025                                 old_arr->count--;
4026                                 break;
4027                         }
4028                 }
4029         }
4030         return ret;
4031 }
4032
4033 /* Use this Xmit function for 3AD as well as XOR modes. The current
4034  * usable slave array is formed in the control path. The xmit function
4035  * just calculates hash and sends the packet out.
4036  */
4037 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4038                                      struct net_device *dev)
4039 {
4040         struct bonding *bond = netdev_priv(dev);
4041         struct slave *slave;
4042         struct bond_up_slave *slaves;
4043         unsigned int count;
4044
4045         slaves = rcu_dereference(bond->slave_arr);
4046         count = slaves ? READ_ONCE(slaves->count) : 0;
4047         if (likely(count)) {
4048                 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
4049                 bond_dev_queue_xmit(bond, skb, slave->dev);
4050         } else {
4051                 bond_tx_drop(dev, skb);
4052         }
4053
4054         return NETDEV_TX_OK;
4055 }
4056
4057 /* in broadcast mode, we send everything to all usable interfaces. */
4058 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4059                                        struct net_device *bond_dev)
4060 {
4061         struct bonding *bond = netdev_priv(bond_dev);
4062         struct slave *slave = NULL;
4063         struct list_head *iter;
4064
4065         bond_for_each_slave_rcu(bond, slave, iter) {
4066                 if (bond_is_last_slave(bond, slave))
4067                         break;
4068                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4069                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4070
4071                         if (!skb2) {
4072                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4073                                                     bond_dev->name, __func__);
4074                                 continue;
4075                         }
4076                         bond_dev_queue_xmit(bond, skb2, slave->dev);
4077                 }
4078         }
4079         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4080                 bond_dev_queue_xmit(bond, skb, slave->dev);
4081         else
4082                 bond_tx_drop(bond_dev, skb);
4083
4084         return NETDEV_TX_OK;
4085 }
4086
4087 /*------------------------- Device initialization ---------------------------*/
4088
4089 /* Lookup the slave that corresponds to a qid */
4090 static inline int bond_slave_override(struct bonding *bond,
4091                                       struct sk_buff *skb)
4092 {
4093         struct slave *slave = NULL;
4094         struct list_head *iter;
4095
4096         if (!skb_rx_queue_recorded(skb))
4097                 return 1;
4098
4099         /* Find out if any slaves have the same mapping as this skb. */
4100         bond_for_each_slave_rcu(bond, slave, iter) {
4101                 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4102                         if (bond_slave_is_up(slave) &&
4103                             slave->link == BOND_LINK_UP) {
4104                                 bond_dev_queue_xmit(bond, skb, slave->dev);
4105                                 return 0;
4106                         }
4107                         /* If the slave isn't UP, use default transmit policy. */
4108                         break;
4109                 }
4110         }
4111
4112         return 1;
4113 }
4114
4115
4116 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4117                              struct net_device *sb_dev,
4118                              select_queue_fallback_t fallback)
4119 {
4120         /* This helper function exists to help dev_pick_tx get the correct
4121          * destination queue.  Using a helper function skips a call to
4122          * skb_tx_hash and will put the skbs in the queue we expect on their
4123          * way down to the bonding driver.
4124          */
4125         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4126
4127         /* Save the original txq to restore before passing to the driver */
4128         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4129
4130         if (unlikely(txq >= dev->real_num_tx_queues)) {
4131                 do {
4132                         txq -= dev->real_num_tx_queues;
4133                 } while (txq >= dev->real_num_tx_queues);
4134         }
4135         return txq;
4136 }
4137
4138 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4139 {
4140         struct bonding *bond = netdev_priv(dev);
4141
4142         if (bond_should_override_tx_queue(bond) &&
4143             !bond_slave_override(bond, skb))
4144                 return NETDEV_TX_OK;
4145
4146         switch (BOND_MODE(bond)) {
4147         case BOND_MODE_ROUNDROBIN:
4148                 return bond_xmit_roundrobin(skb, dev);
4149         case BOND_MODE_ACTIVEBACKUP:
4150                 return bond_xmit_activebackup(skb, dev);
4151         case BOND_MODE_8023AD:
4152         case BOND_MODE_XOR:
4153                 return bond_3ad_xor_xmit(skb, dev);
4154         case BOND_MODE_BROADCAST:
4155                 return bond_xmit_broadcast(skb, dev);
4156         case BOND_MODE_ALB:
4157                 return bond_alb_xmit(skb, dev);
4158         case BOND_MODE_TLB:
4159                 return bond_tlb_xmit(skb, dev);
4160         default:
4161                 /* Should never happen, mode already checked */
4162                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4163                 WARN_ON_ONCE(1);
4164                 bond_tx_drop(dev, skb);
4165                 return NETDEV_TX_OK;
4166         }
4167 }
4168
4169 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4170 {
4171         struct bonding *bond = netdev_priv(dev);
4172         netdev_tx_t ret = NETDEV_TX_OK;
4173
4174         /* If we risk deadlock from transmitting this in the
4175          * netpoll path, tell netpoll to queue the frame for later tx
4176          */
4177         if (unlikely(is_netpoll_tx_blocked(dev)))
4178                 return NETDEV_TX_BUSY;
4179
4180         rcu_read_lock();
4181         if (bond_has_slaves(bond))
4182                 ret = __bond_start_xmit(skb, dev);
4183         else
4184                 bond_tx_drop(dev, skb);
4185         rcu_read_unlock();
4186
4187         return ret;
4188 }
4189
4190 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4191                                            struct ethtool_link_ksettings *cmd)
4192 {
4193         struct bonding *bond = netdev_priv(bond_dev);
4194         unsigned long speed = 0;
4195         struct list_head *iter;
4196         struct slave *slave;
4197
4198         cmd->base.duplex = DUPLEX_UNKNOWN;
4199         cmd->base.port = PORT_OTHER;
4200
4201         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4202          * do not need to check mode.  Though link speed might not represent
4203          * the true receive or transmit bandwidth (not all modes are symmetric)
4204          * this is an accurate maximum.
4205          */
4206         bond_for_each_slave(bond, slave, iter) {
4207                 if (bond_slave_can_tx(slave)) {
4208                         if (slave->speed != SPEED_UNKNOWN)
4209                                 speed += slave->speed;
4210                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4211                             slave->duplex != DUPLEX_UNKNOWN)
4212                                 cmd->base.duplex = slave->duplex;
4213                 }
4214         }
4215         cmd->base.speed = speed ? : SPEED_UNKNOWN;
4216
4217         return 0;
4218 }
4219
4220 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4221                                      struct ethtool_drvinfo *drvinfo)
4222 {
4223         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4224         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4225         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4226                  BOND_ABI_VERSION);
4227 }
4228
4229 static const struct ethtool_ops bond_ethtool_ops = {
4230         .get_drvinfo            = bond_ethtool_get_drvinfo,
4231         .get_link               = ethtool_op_get_link,
4232         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4233 };
4234
4235 static const struct net_device_ops bond_netdev_ops = {
4236         .ndo_init               = bond_init,
4237         .ndo_uninit             = bond_uninit,
4238         .ndo_open               = bond_open,
4239         .ndo_stop               = bond_close,
4240         .ndo_start_xmit         = bond_start_xmit,
4241         .ndo_select_queue       = bond_select_queue,
4242         .ndo_get_stats64        = bond_get_stats,
4243         .ndo_do_ioctl           = bond_do_ioctl,
4244         .ndo_change_rx_flags    = bond_change_rx_flags,
4245         .ndo_set_rx_mode        = bond_set_rx_mode,
4246         .ndo_change_mtu         = bond_change_mtu,
4247         .ndo_set_mac_address    = bond_set_mac_address,
4248         .ndo_neigh_setup        = bond_neigh_setup,
4249         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4250         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4251         .ndo_get_lock_subclass  = bond_get_nest_level,
4252 #ifdef CONFIG_NET_POLL_CONTROLLER
4253         .ndo_netpoll_setup      = bond_netpoll_setup,
4254         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4255         .ndo_poll_controller    = bond_poll_controller,
4256 #endif
4257         .ndo_add_slave          = bond_enslave,
4258         .ndo_del_slave          = bond_release,
4259         .ndo_fix_features       = bond_fix_features,
4260         .ndo_features_check     = passthru_features_check,
4261 };
4262
4263 static const struct device_type bond_type = {
4264         .name = "bond",
4265 };
4266
4267 static void bond_destructor(struct net_device *bond_dev)
4268 {
4269         struct bonding *bond = netdev_priv(bond_dev);
4270         if (bond->wq)
4271                 destroy_workqueue(bond->wq);
4272 }
4273
4274 void bond_setup(struct net_device *bond_dev)
4275 {
4276         struct bonding *bond = netdev_priv(bond_dev);
4277
4278         spin_lock_init(&bond->mode_lock);
4279         spin_lock_init(&bond->stats_lock);
4280         bond->params = bonding_defaults;
4281
4282         /* Initialize pointers */
4283         bond->dev = bond_dev;
4284
4285         /* Initialize the device entry points */
4286         ether_setup(bond_dev);
4287         bond_dev->max_mtu = ETH_MAX_MTU;
4288         bond_dev->netdev_ops = &bond_netdev_ops;
4289         bond_dev->ethtool_ops = &bond_ethtool_ops;
4290
4291         bond_dev->needs_free_netdev = true;
4292         bond_dev->priv_destructor = bond_destructor;
4293
4294         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4295
4296         /* Initialize the device options */
4297         bond_dev->flags |= IFF_MASTER;
4298         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4299         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4300
4301         /* don't acquire bond device's netif_tx_lock when transmitting */
4302         bond_dev->features |= NETIF_F_LLTX;
4303
4304         /* By default, we declare the bond to be fully
4305          * VLAN hardware accelerated capable. Special
4306          * care is taken in the various xmit functions
4307          * when there are slaves that are not hw accel
4308          * capable
4309          */
4310
4311         /* Don't allow bond devices to change network namespaces. */
4312         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4313
4314         bond_dev->hw_features = BOND_VLAN_FEATURES |
4315                                 NETIF_F_HW_VLAN_CTAG_TX |
4316                                 NETIF_F_HW_VLAN_CTAG_RX |
4317                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4318
4319         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4;
4320         bond_dev->features |= bond_dev->hw_features;
4321 }
4322
4323 /* Destroy a bonding device.
4324  * Must be under rtnl_lock when this function is called.
4325  */
4326 static void bond_uninit(struct net_device *bond_dev)
4327 {
4328         struct bonding *bond = netdev_priv(bond_dev);
4329         struct list_head *iter;
4330         struct slave *slave;
4331         struct bond_up_slave *arr;
4332
4333         bond_netpoll_cleanup(bond_dev);
4334
4335         /* Release the bonded slaves */
4336         bond_for_each_slave(bond, slave, iter)
4337                 __bond_release_one(bond_dev, slave->dev, true, true);
4338         netdev_info(bond_dev, "Released all slaves\n");
4339
4340         arr = rtnl_dereference(bond->slave_arr);
4341         if (arr) {
4342                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4343                 kfree_rcu(arr, rcu);
4344         }
4345
4346         list_del(&bond->bond_list);
4347
4348         bond_debug_unregister(bond);
4349 }
4350
4351 /*------------------------- Module initialization ---------------------------*/
4352
4353 static int bond_check_params(struct bond_params *params)
4354 {
4355         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4356         struct bond_opt_value newval;
4357         const struct bond_opt_value *valptr;
4358         int arp_all_targets_value = 0;
4359         u16 ad_actor_sys_prio = 0;
4360         u16 ad_user_port_key = 0;
4361         __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4362         int arp_ip_count;
4363         int bond_mode   = BOND_MODE_ROUNDROBIN;
4364         int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4365         int lacp_fast = 0;
4366         int tlb_dynamic_lb;
4367
4368         /* Convert string parameters. */
4369         if (mode) {
4370                 bond_opt_initstr(&newval, mode);
4371                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4372                 if (!valptr) {
4373                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4374                         return -EINVAL;
4375                 }
4376                 bond_mode = valptr->value;
4377         }
4378
4379         if (xmit_hash_policy) {
4380                 if (bond_mode == BOND_MODE_ROUNDROBIN ||
4381                     bond_mode == BOND_MODE_ACTIVEBACKUP ||
4382                     bond_mode == BOND_MODE_BROADCAST) {
4383                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4384                                 bond_mode_name(bond_mode));
4385                 } else {
4386                         bond_opt_initstr(&newval, xmit_hash_policy);
4387                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4388                                                 &newval);
4389                         if (!valptr) {
4390                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4391                                        xmit_hash_policy);
4392                                 return -EINVAL;
4393                         }
4394                         xmit_hashtype = valptr->value;
4395                 }
4396         }
4397
4398         if (lacp_rate) {
4399                 if (bond_mode != BOND_MODE_8023AD) {
4400                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4401                                 bond_mode_name(bond_mode));
4402                 } else {
4403                         bond_opt_initstr(&newval, lacp_rate);
4404                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4405                                                 &newval);
4406                         if (!valptr) {
4407                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4408                                        lacp_rate);
4409                                 return -EINVAL;
4410                         }
4411                         lacp_fast = valptr->value;
4412                 }
4413         }
4414
4415         if (ad_select) {
4416                 bond_opt_initstr(&newval, ad_select);
4417                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4418                                         &newval);
4419                 if (!valptr) {
4420                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4421                         return -EINVAL;
4422                 }
4423                 params->ad_select = valptr->value;
4424                 if (bond_mode != BOND_MODE_8023AD)
4425                         pr_warn("ad_select param only affects 802.3ad mode\n");
4426         } else {
4427                 params->ad_select = BOND_AD_STABLE;
4428         }
4429
4430         if (max_bonds < 0) {
4431                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4432                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4433                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4434         }
4435
4436         if (miimon < 0) {
4437                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4438                         miimon, INT_MAX);
4439                 miimon = 0;
4440         }
4441
4442         if (updelay < 0) {
4443                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4444                         updelay, INT_MAX);
4445                 updelay = 0;
4446         }
4447
4448         if (downdelay < 0) {
4449                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4450                         downdelay, INT_MAX);
4451                 downdelay = 0;
4452         }
4453
4454         if ((use_carrier != 0) && (use_carrier != 1)) {
4455                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4456                         use_carrier);
4457                 use_carrier = 1;
4458         }
4459
4460         if (num_peer_notif < 0 || num_peer_notif > 255) {
4461                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4462                         num_peer_notif);
4463                 num_peer_notif = 1;
4464         }
4465
4466         /* reset values for 802.3ad/TLB/ALB */
4467         if (!bond_mode_uses_arp(bond_mode)) {
4468                 if (!miimon) {
4469                         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");
4470                         pr_warn("Forcing miimon to 100msec\n");
4471                         miimon = BOND_DEFAULT_MIIMON;
4472                 }
4473         }
4474
4475         if (tx_queues < 1 || tx_queues > 255) {
4476                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4477                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4478                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4479         }
4480
4481         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4482                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4483                         all_slaves_active);
4484                 all_slaves_active = 0;
4485         }
4486
4487         if (resend_igmp < 0 || resend_igmp > 255) {
4488                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4489                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4490                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4491         }
4492
4493         bond_opt_initval(&newval, packets_per_slave);
4494         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4495                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4496                         packets_per_slave, USHRT_MAX);
4497                 packets_per_slave = 1;
4498         }
4499
4500         if (bond_mode == BOND_MODE_ALB) {
4501                 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",
4502                           updelay);
4503         }
4504
4505         if (!miimon) {
4506                 if (updelay || downdelay) {
4507                         /* just warn the user the up/down delay will have
4508                          * no effect since miimon is zero...
4509                          */
4510                         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",
4511                                 updelay, downdelay);
4512                 }
4513         } else {
4514                 /* don't allow arp monitoring */
4515                 if (arp_interval) {
4516                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4517                                 miimon, arp_interval);
4518                         arp_interval = 0;
4519                 }
4520
4521                 if ((updelay % miimon) != 0) {
4522                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4523                                 updelay, miimon, (updelay / miimon) * miimon);
4524                 }
4525
4526                 updelay /= miimon;
4527
4528                 if ((downdelay % miimon) != 0) {
4529                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4530                                 downdelay, miimon,
4531                                 (downdelay / miimon) * miimon);
4532                 }
4533
4534                 downdelay /= miimon;
4535         }
4536
4537         if (arp_interval < 0) {
4538                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4539                         arp_interval, INT_MAX);
4540                 arp_interval = 0;
4541         }
4542
4543         for (arp_ip_count = 0, i = 0;
4544              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4545                 __be32 ip;
4546
4547                 /* not a complete check, but good enough to catch mistakes */
4548                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4549                     !bond_is_ip_target_ok(ip)) {
4550                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4551                                 arp_ip_target[i]);
4552                         arp_interval = 0;
4553                 } else {
4554                         if (bond_get_targets_ip(arp_target, ip) == -1)
4555                                 arp_target[arp_ip_count++] = ip;
4556                         else
4557                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4558                                         &ip);
4559                 }
4560         }
4561
4562         if (arp_interval && !arp_ip_count) {
4563                 /* don't allow arping if no arp_ip_target given... */
4564                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4565                         arp_interval);
4566                 arp_interval = 0;
4567         }
4568
4569         if (arp_validate) {
4570                 if (!arp_interval) {
4571                         pr_err("arp_validate requires arp_interval\n");
4572                         return -EINVAL;
4573                 }
4574
4575                 bond_opt_initstr(&newval, arp_validate);
4576                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4577                                         &newval);
4578                 if (!valptr) {
4579                         pr_err("Error: invalid arp_validate \"%s\"\n",
4580                                arp_validate);
4581                         return -EINVAL;
4582                 }
4583                 arp_validate_value = valptr->value;
4584         } else {
4585                 arp_validate_value = 0;
4586         }
4587
4588         if (arp_all_targets) {
4589                 bond_opt_initstr(&newval, arp_all_targets);
4590                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4591                                         &newval);
4592                 if (!valptr) {
4593                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4594                                arp_all_targets);
4595                         arp_all_targets_value = 0;
4596                 } else {
4597                         arp_all_targets_value = valptr->value;
4598                 }
4599         }
4600
4601         if (miimon) {
4602                 pr_info("MII link monitoring set to %d ms\n", miimon);
4603         } else if (arp_interval) {
4604                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4605                                           arp_validate_value);
4606                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4607                         arp_interval, valptr->string, arp_ip_count);
4608
4609                 for (i = 0; i < arp_ip_count; i++)
4610                         pr_cont(" %s", arp_ip_target[i]);
4611
4612                 pr_cont("\n");
4613
4614         } else if (max_bonds) {
4615                 /* miimon and arp_interval not set, we need one so things
4616                  * work as expected, see bonding.txt for details
4617                  */
4618                 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");
4619         }
4620
4621         if (primary && !bond_mode_uses_primary(bond_mode)) {
4622                 /* currently, using a primary only makes sense
4623                  * in active backup, TLB or ALB modes
4624                  */
4625                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4626                         primary, bond_mode_name(bond_mode));
4627                 primary = NULL;
4628         }
4629
4630         if (primary && primary_reselect) {
4631                 bond_opt_initstr(&newval, primary_reselect);
4632                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4633                                         &newval);
4634                 if (!valptr) {
4635                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4636                                primary_reselect);
4637                         return -EINVAL;
4638                 }
4639                 primary_reselect_value = valptr->value;
4640         } else {
4641                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4642         }
4643
4644         if (fail_over_mac) {
4645                 bond_opt_initstr(&newval, fail_over_mac);
4646                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4647                                         &newval);
4648                 if (!valptr) {
4649                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4650                                fail_over_mac);
4651                         return -EINVAL;
4652                 }
4653                 fail_over_mac_value = valptr->value;
4654                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4655                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4656         } else {
4657                 fail_over_mac_value = BOND_FOM_NONE;
4658         }
4659
4660         bond_opt_initstr(&newval, "default");
4661         valptr = bond_opt_parse(
4662                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4663                                      &newval);
4664         if (!valptr) {
4665                 pr_err("Error: No ad_actor_sys_prio default value");
4666                 return -EINVAL;
4667         }
4668         ad_actor_sys_prio = valptr->value;
4669
4670         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4671                                 &newval);
4672         if (!valptr) {
4673                 pr_err("Error: No ad_user_port_key default value");
4674                 return -EINVAL;
4675         }
4676         ad_user_port_key = valptr->value;
4677
4678         bond_opt_initstr(&newval, "default");
4679         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
4680         if (!valptr) {
4681                 pr_err("Error: No tlb_dynamic_lb default value");
4682                 return -EINVAL;
4683         }
4684         tlb_dynamic_lb = valptr->value;
4685
4686         if (lp_interval == 0) {
4687                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4688                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4689                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4690         }
4691
4692         /* fill params struct with the proper values */
4693         params->mode = bond_mode;
4694         params->xmit_policy = xmit_hashtype;
4695         params->miimon = miimon;
4696         params->num_peer_notif = num_peer_notif;
4697         params->arp_interval = arp_interval;
4698         params->arp_validate = arp_validate_value;
4699         params->arp_all_targets = arp_all_targets_value;
4700         params->updelay = updelay;
4701         params->downdelay = downdelay;
4702         params->use_carrier = use_carrier;
4703         params->lacp_fast = lacp_fast;
4704         params->primary[0] = 0;
4705         params->primary_reselect = primary_reselect_value;
4706         params->fail_over_mac = fail_over_mac_value;
4707         params->tx_queues = tx_queues;
4708         params->all_slaves_active = all_slaves_active;
4709         params->resend_igmp = resend_igmp;
4710         params->min_links = min_links;
4711         params->lp_interval = lp_interval;
4712         params->packets_per_slave = packets_per_slave;
4713         params->tlb_dynamic_lb = tlb_dynamic_lb;
4714         params->ad_actor_sys_prio = ad_actor_sys_prio;
4715         eth_zero_addr(params->ad_actor_system);
4716         params->ad_user_port_key = ad_user_port_key;
4717         if (packets_per_slave > 0) {
4718                 params->reciprocal_packets_per_slave =
4719                         reciprocal_value(packets_per_slave);
4720         } else {
4721                 /* reciprocal_packets_per_slave is unused if
4722                  * packets_per_slave is 0 or 1, just initialize it
4723                  */
4724                 params->reciprocal_packets_per_slave =
4725                         (struct reciprocal_value) { 0 };
4726         }
4727
4728         if (primary) {
4729                 strncpy(params->primary, primary, IFNAMSIZ);
4730                 params->primary[IFNAMSIZ - 1] = 0;
4731         }
4732
4733         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4734
4735         return 0;
4736 }
4737
4738 /* Called from registration process */
4739 static int bond_init(struct net_device *bond_dev)
4740 {
4741         struct bonding *bond = netdev_priv(bond_dev);
4742         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4743
4744         netdev_dbg(bond_dev, "Begin bond_init\n");
4745
4746         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4747         if (!bond->wq)
4748                 return -ENOMEM;
4749
4750         bond->nest_level = SINGLE_DEPTH_NESTING;
4751         netdev_lockdep_set_classes(bond_dev);
4752
4753         list_add_tail(&bond->bond_list, &bn->dev_list);
4754
4755         bond_prepare_sysfs_group(bond);
4756
4757         bond_debug_register(bond);
4758
4759         /* Ensure valid dev_addr */
4760         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4761             bond_dev->addr_assign_type == NET_ADDR_PERM)
4762                 eth_hw_addr_random(bond_dev);
4763
4764         return 0;
4765 }
4766
4767 unsigned int bond_get_num_tx_queues(void)
4768 {
4769         return tx_queues;
4770 }
4771
4772 /* Create a new bond based on the specified name and bonding parameters.
4773  * If name is NULL, obtain a suitable "bond%d" name for us.
4774  * Caller must NOT hold rtnl_lock; we need to release it here before we
4775  * set up our sysfs entries.
4776  */
4777 int bond_create(struct net *net, const char *name)
4778 {
4779         struct net_device *bond_dev;
4780         struct bonding *bond;
4781         struct alb_bond_info *bond_info;
4782         int res;
4783
4784         rtnl_lock();
4785
4786         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4787                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4788                                    bond_setup, tx_queues);
4789         if (!bond_dev) {
4790                 pr_err("%s: eek! can't alloc netdev!\n", name);
4791                 rtnl_unlock();
4792                 return -ENOMEM;
4793         }
4794
4795         /*
4796          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4797          * It is set to 0 by default which is wrong.
4798          */
4799         bond = netdev_priv(bond_dev);
4800         bond_info = &(BOND_ALB_INFO(bond));
4801         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4802
4803         dev_net_set(bond_dev, net);
4804         bond_dev->rtnl_link_ops = &bond_link_ops;
4805
4806         res = register_netdevice(bond_dev);
4807
4808         netif_carrier_off(bond_dev);
4809
4810         bond_work_init_all(bond);
4811
4812         rtnl_unlock();
4813         if (res < 0)
4814                 free_netdev(bond_dev);
4815         return res;
4816 }
4817
4818 static int __net_init bond_net_init(struct net *net)
4819 {
4820         struct bond_net *bn = net_generic(net, bond_net_id);
4821
4822         bn->net = net;
4823         INIT_LIST_HEAD(&bn->dev_list);
4824
4825         bond_create_proc_dir(bn);
4826         bond_create_sysfs(bn);
4827
4828         return 0;
4829 }
4830
4831 static void __net_exit bond_net_exit(struct net *net)
4832 {
4833         struct bond_net *bn = net_generic(net, bond_net_id);
4834         struct bonding *bond, *tmp_bond;
4835         LIST_HEAD(list);
4836
4837         bond_destroy_sysfs(bn);
4838
4839         /* Kill off any bonds created after unregistering bond rtnl ops */
4840         rtnl_lock();
4841         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4842                 unregister_netdevice_queue(bond->dev, &list);
4843         unregister_netdevice_many(&list);
4844         rtnl_unlock();
4845
4846         bond_destroy_proc_dir(bn);
4847 }
4848
4849 static struct pernet_operations bond_net_ops = {
4850         .init = bond_net_init,
4851         .exit = bond_net_exit,
4852         .id   = &bond_net_id,
4853         .size = sizeof(struct bond_net),
4854 };
4855
4856 static int __init bonding_init(void)
4857 {
4858         int i;
4859         int res;
4860
4861         pr_info("%s", bond_version);
4862
4863         res = bond_check_params(&bonding_defaults);
4864         if (res)
4865                 goto out;
4866
4867         res = register_pernet_subsys(&bond_net_ops);
4868         if (res)
4869                 goto out;
4870
4871         res = bond_netlink_init();
4872         if (res)
4873                 goto err_link;
4874
4875         bond_create_debugfs();
4876
4877         for (i = 0; i < max_bonds; i++) {
4878                 res = bond_create(&init_net, NULL);
4879                 if (res)
4880                         goto err;
4881         }
4882
4883         register_netdevice_notifier(&bond_netdev_notifier);
4884 out:
4885         return res;
4886 err:
4887         bond_destroy_debugfs();
4888         bond_netlink_fini();
4889 err_link:
4890         unregister_pernet_subsys(&bond_net_ops);
4891         goto out;
4892
4893 }
4894
4895 static void __exit bonding_exit(void)
4896 {
4897         unregister_netdevice_notifier(&bond_netdev_notifier);
4898
4899         bond_destroy_debugfs();
4900
4901         bond_netlink_fini();
4902         unregister_pernet_subsys(&bond_net_ops);
4903
4904 #ifdef CONFIG_NET_POLL_CONTROLLER
4905         /* Make sure we don't have an imbalance on our netpoll blocking */
4906         WARN_ON(atomic_read(&netpoll_block_tx));
4907 #endif
4908 }
4909
4910 module_init(bonding_init);
4911 module_exit(bonding_exit);
4912 MODULE_LICENSE("GPL");
4913 MODULE_VERSION(DRV_VERSION);
4914 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4915 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");