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 static const struct flow_dissector_key flow_keys_bonding_keys[] = {
 204         {
 205                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
 206                 .offset = offsetof(struct flow_keys, control),
 207         },
 208         {
 209                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
 210                 .offset = offsetof(struct flow_keys, basic),
 211         },
 212         {
 213                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 214                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
 215         },
 216         {
 217                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 218                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
 219         },
 220         {
 221                 .key_id = FLOW_DISSECTOR_KEY_TIPC,
 222                 .offset = offsetof(struct flow_keys, addrs.tipckey),
 223         },
 224         {
 225                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
 226                 .offset = offsetof(struct flow_keys, ports),
 227         },
 228         {
 229                 .key_id = FLOW_DISSECTOR_KEY_ICMP,
 230                 .offset = offsetof(struct flow_keys, icmp),
 231         },
 232         {
 233                 .key_id = FLOW_DISSECTOR_KEY_VLAN,
 234                 .offset = offsetof(struct flow_keys, vlan),
 235         },
 236         {
 237                 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
 238                 .offset = offsetof(struct flow_keys, tags),
 239         },
 240         {
 241                 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
 242                 .offset = offsetof(struct flow_keys, keyid),
 243         },
 244 };
 245
 246 static struct flow_dissector flow_keys_bonding __read_mostly;
 247
 248 /*-------------------------- Forward declarations ---------------------------*/
 249
 250 static int bond_init(struct net_device *bond_dev);
 251 static void bond_uninit(struct net_device *bond_dev);
 252 static void bond_get_stats(struct net_device *bond_dev,
 253                            struct rtnl_link_stats64 *stats);
 254 static void bond_slave_arr_handler(struct work_struct *work);
 255 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 256                                   int mod);
 257 static void bond_netdev_notify_work(struct work_struct *work);
 258
 259 /*---------------------------- General routines -----------------------------*/
 260
 261 const char *bond_mode_name(int mode)
 262 {
 263         static const char *names[] = {
 264                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 265                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 266                 [BOND_MODE_XOR] = "load balancing (xor)",
 267                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 268                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 269                 [BOND_MODE_TLB] = "transmit load balancing",
 270                 [BOND_MODE_ALB] = "adaptive load balancing",
 271         };
 272
 273         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 274                 return "unknown";
 275
 276         return names[mode];
 277 }
 278
 279 /*---------------------------------- VLAN -----------------------------------*/
 280
 281 /**
 282  * bond_dev_queue_xmit - Prepare skb for xmit.
 283  *
 284  * @bond: bond device that got this skb for tx.
 285  * @skb: hw accel VLAN tagged skb to transmit
 286  * @slave_dev: slave that is supposed to xmit this skbuff
 287  */
 288 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 289                         struct net_device *slave_dev)
 290 {
 291         skb->dev = slave_dev;
 292
 293         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 294                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 295         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 296
 297         if (unlikely(netpoll_tx_running(bond->dev)))
 298                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 299         else
 300                 dev_queue_xmit(skb);
 301 }
 302
 303 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 304  * We don't protect the slave list iteration with a lock because:
 305  * a. This operation is performed in IOCTL context,
 306  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 307  * c. Holding a lock with BH disabled while directly calling a base driver
 308  *    entry point is generally a BAD idea.
 309  *
 310  * The design of synchronization/protection for this operation in the 8021q
 311  * module is good for one or more VLAN devices over a single physical device
 312  * and cannot be extended for a teaming solution like bonding, so there is a
 313  * potential race condition here where a net device from the vlan group might
 314  * be referenced (either by a base driver or the 8021q code) while it is being
 315  * removed from the system. However, it turns out we're not making matters
 316  * worse, and if it works for regular VLAN usage it will work here too.
 317 */
 318
 319 /**
 320  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 321  * @bond_dev: bonding net device that got called
 322  * @vid: vlan id being added
 323  */
 324 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 325                                 __be16 proto, u16 vid)
 326 {
 327         struct bonding *bond = netdev_priv(bond_dev);
 328         struct slave *slave, *rollback_slave;
 329         struct list_head *iter;
 330         int res;
 331
 332         bond_for_each_slave(bond, slave, iter) {
 333                 res = vlan_vid_add(slave->dev, proto, vid);
 334                 if (res)
 335                         goto unwind;
 336         }
 337
 338         return 0;
 339
 340 unwind:
 341         /* unwind to the slave that failed */
 342         bond_for_each_slave(bond, rollback_slave, iter) {
 343                 if (rollback_slave == slave)
 344                         break;
 345
 346                 vlan_vid_del(rollback_slave->dev, proto, vid);
 347         }
 348
 349         return res;
 350 }
 351
 352 /**
 353  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 354  * @bond_dev: bonding net device that got called
 355  * @vid: vlan id being removed
 356  */
 357 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 358                                  __be16 proto, u16 vid)
 359 {
 360         struct bonding *bond = netdev_priv(bond_dev);
 361         struct list_head *iter;
 362         struct slave *slave;
 363
 364         bond_for_each_slave(bond, slave, iter)
 365                 vlan_vid_del(slave->dev, proto, vid);
 366
 367         if (bond_is_lb(bond))
 368                 bond_alb_clear_vlan(bond, vid);
 369
 370         return 0;
 371 }
 372
 373 /*------------------------------- Link status -------------------------------*/
 374
 375 /* Set the carrier state for the master according to the state of its
 376  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 377  * do special 802.3ad magic.
 378  *
 379  * Returns zero if carrier state does not change, nonzero if it does.
 380  */
 381 int bond_set_carrier(struct bonding *bond)
 382 {
 383         struct list_head *iter;
 384         struct slave *slave;
 385
 386         if (!bond_has_slaves(bond))
 387                 goto down;
 388
 389         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 390                 return bond_3ad_set_carrier(bond);
 391
 392         bond_for_each_slave(bond, slave, iter) {
 393                 if (slave->link == BOND_LINK_UP) {
 394                         if (!netif_carrier_ok(bond->dev)) {
 395                                 netif_carrier_on(bond->dev);
 396                                 return 1;
 397                         }
 398                         return 0;
 399                 }
 400         }
 401
 402 down:
 403         if (netif_carrier_ok(bond->dev)) {
 404                 netif_carrier_off(bond->dev);
 405                 return 1;
 406         }
 407         return 0;
 408 }
 409
 410 /* Get link speed and duplex from the slave's base driver
 411  * using ethtool. If for some reason the call fails or the
 412  * values are invalid, set speed and duplex to -1,
 413  * and return. Return 1 if speed or duplex settings are
 414  * UNKNOWN; 0 otherwise.
 415  */
 416 static int bond_update_speed_duplex(struct slave *slave)
 417 {
 418         struct net_device *slave_dev = slave->dev;
 419         struct ethtool_link_ksettings ecmd;
 420         int res;
 421
 422         slave->speed = SPEED_UNKNOWN;
 423         slave->duplex = DUPLEX_UNKNOWN;
 424
 425         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 426         if (res < 0)
 427                 return 1;
 428         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 429                 return 1;
 430         switch (ecmd.base.duplex) {
 431         case DUPLEX_FULL:
 432         case DUPLEX_HALF:
 433                 break;
 434         default:
 435                 return 1;
 436         }
 437
 438         slave->speed = ecmd.base.speed;
 439         slave->duplex = ecmd.base.duplex;
 440
 441         return 0;
 442 }
 443
 444 const char *bond_slave_link_status(s8 link)
 445 {
 446         switch (link) {
 447         case BOND_LINK_UP:
 448                 return "up";
 449         case BOND_LINK_FAIL:
 450                 return "going down";
 451         case BOND_LINK_DOWN:
 452                 return "down";
 453         case BOND_LINK_BACK:
 454                 return "going back";
 455         default:
 456                 return "unknown";
 457         }
 458 }
 459
 460 /* if <dev> supports MII link status reporting, check its link status.
 461  *
 462  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 463  * depending upon the setting of the use_carrier parameter.
 464  *
 465  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 466  * can't tell and just pretend it is), or 0, meaning that the link is
 467  * down.
 468  *
 469  * If reporting is non-zero, instead of faking link up, return -1 if
 470  * both ETHTOOL and MII ioctls fail (meaning the device does not
 471  * support them).  If use_carrier is set, return whatever it says.
 472  * It'd be nice if there was a good way to tell if a driver supports
 473  * netif_carrier, but there really isn't.
 474  */
 475 static int bond_check_dev_link(struct bonding *bond,
 476                                struct net_device *slave_dev, int reporting)
 477 {
 478         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 479         int (*ioctl)(struct net_device *, struct ifreq *, int);
 480         struct ifreq ifr;
 481         struct mii_ioctl_data *mii;
 482
 483         if (!reporting && !netif_running(slave_dev))
 484                 return 0;
 485
 486         if (bond->params.use_carrier)
 487                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 488
 489         /* Try to get link status using Ethtool first. */
 490         if (slave_dev->ethtool_ops->get_link)
 491                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 492                         BMSR_LSTATUS : 0;
 493
 494         /* Ethtool can't be used, fallback to MII ioctls. */
 495         ioctl = slave_ops->ndo_do_ioctl;
 496         if (ioctl) {
 497                 /* TODO: set pointer to correct ioctl on a per team member
 498                  *       bases to make this more efficient. that is, once
 499                  *       we determine the correct ioctl, we will always
 500                  *       call it and not the others for that team
 501                  *       member.
 502                  */
 503
 504                 /* We cannot assume that SIOCGMIIPHY will also read a
 505                  * register; not all network drivers (e.g., e100)
 506                  * support that.
 507                  */
 508
 509                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 510                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 511                 mii = if_mii(&ifr);
 512                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 513                         mii->reg_num = MII_BMSR;
 514                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 515                                 return mii->val_out & BMSR_LSTATUS;
 516                 }
 517         }
 518
 519         /* If reporting, report that either there's no dev->do_ioctl,
 520          * or both SIOCGMIIREG and get_link failed (meaning that we
 521          * cannot report link status).  If not reporting, pretend
 522          * we're ok.
 523          */
 524         return reporting ? -1 : BMSR_LSTATUS;
 525 }
 526
 527 /*----------------------------- Multicast list ------------------------------*/
 528
 529 /* Push the promiscuity flag down to appropriate slaves */
 530 static int bond_set_promiscuity(struct bonding *bond, int inc)
 531 {
 532         struct list_head *iter;
 533         int err = 0;
 534
 535         if (bond_uses_primary(bond)) {
 536                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 537
 538                 if (curr_active)
 539                         err = dev_set_promiscuity(curr_active->dev, inc);
 540         } else {
 541                 struct slave *slave;
 542
 543                 bond_for_each_slave(bond, slave, iter) {
 544                         err = dev_set_promiscuity(slave->dev, inc);
 545                         if (err)
 546                                 return err;
 547                 }
 548         }
 549         return err;
 550 }
 551
 552 /* Push the allmulti flag down to all slaves */
 553 static int bond_set_allmulti(struct bonding *bond, int inc)
 554 {
 555         struct list_head *iter;
 556         int err = 0;
 557
 558         if (bond_uses_primary(bond)) {
 559                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 560
 561                 if (curr_active)
 562                         err = dev_set_allmulti(curr_active->dev, inc);
 563         } else {
 564                 struct slave *slave;
 565
 566                 bond_for_each_slave(bond, slave, iter) {
 567                         err = dev_set_allmulti(slave->dev, inc);
 568                         if (err)
 569                                 return err;
 570                 }
 571         }
 572         return err;
 573 }
 574
 575 /* Retrieve the list of registered multicast addresses for the bonding
 576  * device and retransmit an IGMP JOIN request to the current active
 577  * slave.
 578  */
 579 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 580 {
 581         struct bonding *bond = container_of(work, struct bonding,
 582                                             mcast_work.work);
 583
 584         if (!rtnl_trylock()) {
 585                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 586                 return;
 587         }
 588         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 589
 590         if (bond->igmp_retrans > 1) {
 591                 bond->igmp_retrans--;
 592                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 593         }
 594         rtnl_unlock();
 595 }
 596
 597 /* Flush bond's hardware addresses from slave */
 598 static void bond_hw_addr_flush(struct net_device *bond_dev,
 599                                struct net_device *slave_dev)
 600 {
 601         struct bonding *bond = netdev_priv(bond_dev);
 602
 603         dev_uc_unsync(slave_dev, bond_dev);
 604         dev_mc_unsync(slave_dev, bond_dev);
 605
 606         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 607                 /* del lacpdu mc addr from mc list */
 608                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 609
 610                 dev_mc_del(slave_dev, lacpdu_multicast);
 611         }
 612 }
 613
 614 /*--------------------------- Active slave change ---------------------------*/
 615
 616 /* Update the hardware address list and promisc/allmulti for the new and
 617  * old active slaves (if any).  Modes that are not using primary keep all
 618  * slaves up date at all times; only the modes that use primary need to call
 619  * this function to swap these settings during a failover.
 620  */
 621 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 622                               struct slave *old_active)
 623 {
 624         if (old_active) {
 625                 if (bond->dev->flags & IFF_PROMISC)
 626                         dev_set_promiscuity(old_active->dev, -1);
 627
 628                 if (bond->dev->flags & IFF_ALLMULTI)
 629                         dev_set_allmulti(old_active->dev, -1);
 630
 631                 bond_hw_addr_flush(bond->dev, old_active->dev);
 632         }
 633
 634         if (new_active) {
 635                 /* FIXME: Signal errors upstream. */
 636                 if (bond->dev->flags & IFF_PROMISC)
 637                         dev_set_promiscuity(new_active->dev, 1);
 638
 639                 if (bond->dev->flags & IFF_ALLMULTI)
 640                         dev_set_allmulti(new_active->dev, 1);
 641
 642                 netif_addr_lock_bh(bond->dev);
 643                 dev_uc_sync(new_active->dev, bond->dev);
 644                 dev_mc_sync(new_active->dev, bond->dev);
 645                 netif_addr_unlock_bh(bond->dev);
 646         }
 647 }
 648
 649 /**
 650  * bond_set_dev_addr - clone slave's address to bond
 651  * @bond_dev: bond net device
 652  * @slave_dev: slave net device
 653  *
 654  * Should be called with RTNL held.
 655  */
 656 static int bond_set_dev_addr(struct net_device *bond_dev,
 657                              struct net_device *slave_dev)
 658 {
 659         int err;
 660
 661         slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 662                   bond_dev, slave_dev, slave_dev->addr_len);
 663         err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 664         if (err)
 665                 return err;
 666
 667         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 668         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 669         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 670         return 0;
 671 }
 672
 673 static struct slave *bond_get_old_active(struct bonding *bond,
 674                                          struct slave *new_active)
 675 {
 676         struct slave *slave;
 677         struct list_head *iter;
 678
 679         bond_for_each_slave(bond, slave, iter) {
 680                 if (slave == new_active)
 681                         continue;
 682
 683                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 684                         return slave;
 685         }
 686
 687         return NULL;
 688 }
 689
 690 /* bond_do_fail_over_mac
 691  *
 692  * Perform special MAC address swapping for fail_over_mac settings
 693  *
 694  * Called with RTNL
 695  */
 696 static void bond_do_fail_over_mac(struct bonding *bond,
 697                                   struct slave *new_active,
 698                                   struct slave *old_active)
 699 {
 700         u8 tmp_mac[MAX_ADDR_LEN];
 701         struct sockaddr_storage ss;
 702         int rv;
 703
 704         switch (bond->params.fail_over_mac) {
 705         case BOND_FOM_ACTIVE:
 706                 if (new_active) {
 707                         rv = bond_set_dev_addr(bond->dev, new_active->dev);
 708                         if (rv)
 709                                 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
 710                                           -rv);
 711                 }
 712                 break;
 713         case BOND_FOM_FOLLOW:
 714                 /* if new_active && old_active, swap them
 715                  * if just old_active, do nothing (going to no active slave)
 716                  * if just new_active, set new_active to bond's MAC
 717                  */
 718                 if (!new_active)
 719                         return;
 720
 721                 if (!old_active)
 722                         old_active = bond_get_old_active(bond, new_active);
 723
 724                 if (old_active) {
 725                         bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 726                                           new_active->dev->addr_len);
 727                         bond_hw_addr_copy(ss.__data,
 728                                           old_active->dev->dev_addr,
 729                                           old_active->dev->addr_len);
 730                         ss.ss_family = new_active->dev->type;
 731                 } else {
 732                         bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 733                                           bond->dev->addr_len);
 734                         ss.ss_family = bond->dev->type;
 735                 }
 736
 737                 rv = dev_set_mac_address(new_active->dev,
 738                                          (struct sockaddr *)&ss, NULL);
 739                 if (rv) {
 740                         slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
 741                                   -rv);
 742                         goto out;
 743                 }
 744
 745                 if (!old_active)
 746                         goto out;
 747
 748                 bond_hw_addr_copy(ss.__data, tmp_mac,
 749                                   new_active->dev->addr_len);
 750                 ss.ss_family = old_active->dev->type;
 751
 752                 rv = dev_set_mac_address(old_active->dev,
 753                                          (struct sockaddr *)&ss, NULL);
 754                 if (rv)
 755                         slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
 756                                   -rv);
 757 out:
 758                 break;
 759         default:
 760                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 761                            bond->params.fail_over_mac);
 762                 break;
 763         }
 764
 765 }
 766
 767 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
 768 {
 769         struct slave *prim = rtnl_dereference(bond->primary_slave);
 770         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 771
 772         if (!prim || prim->link != BOND_LINK_UP) {
 773                 if (!curr || curr->link != BOND_LINK_UP)
 774                         return NULL;
 775                 return curr;
 776         }
 777
 778         if (bond->force_primary) {
 779                 bond->force_primary = false;
 780                 return prim;
 781         }
 782
 783         if (!curr || curr->link != BOND_LINK_UP)
 784                 return prim;
 785
 786         /* At this point, prim and curr are both up */
 787         switch (bond->params.primary_reselect) {
 788         case BOND_PRI_RESELECT_ALWAYS:
 789                 return prim;
 790         case BOND_PRI_RESELECT_BETTER:
 791                 if (prim->speed < curr->speed)
 792                         return curr;
 793                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
 794                         return curr;
 795                 return prim;
 796         case BOND_PRI_RESELECT_FAILURE:
 797                 return curr;
 798         default:
 799                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
 800                            bond->params.primary_reselect);
 801                 return curr;
 802         }
 803 }
 804
 805 /**
 806  * bond_find_best_slave - select the best available slave to be the active one
 807  * @bond: our bonding struct
 808  */
 809 static struct slave *bond_find_best_slave(struct bonding *bond)
 810 {
 811         struct slave *slave, *bestslave = NULL;
 812         struct list_head *iter;
 813         int mintime = bond->params.updelay;
 814
 815         slave = bond_choose_primary_or_current(bond);
 816         if (slave)
 817                 return slave;
 818
 819         bond_for_each_slave(bond, slave, iter) {
 820                 if (slave->link == BOND_LINK_UP)
 821                         return slave;
 822                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 823                     slave->delay < mintime) {
 824                         mintime = slave->delay;
 825                         bestslave = slave;
 826                 }
 827         }
 828
 829         return bestslave;
 830 }
 831
 832 static bool bond_should_notify_peers(struct bonding *bond)
 833 {
 834         struct slave *slave;
 835
 836         rcu_read_lock();
 837         slave = rcu_dereference(bond->curr_active_slave);
 838         rcu_read_unlock();
 839
 840         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 841                    slave ? slave->dev->name : "NULL");
 842
 843         if (!slave || !bond->send_peer_notif ||
 844             bond->send_peer_notif %
 845             max(1, bond->params.peer_notif_delay) != 0 ||
 846             !netif_carrier_ok(bond->dev) ||
 847             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 848                 return false;
 849
 850         return true;
 851 }
 852
 853 /**
 854  * change_active_interface - change the active slave into the specified one
 855  * @bond: our bonding struct
 856  * @new: the new slave to make the active one
 857  *
 858  * Set the new slave to the bond's settings and unset them on the old
 859  * curr_active_slave.
 860  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 861  *
 862  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 863  * because it is apparently the best available slave we have, even though its
 864  * updelay hasn't timed out yet.
 865  *
 866  * Caller must hold RTNL.
 867  */
 868 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 869 {
 870         struct slave *old_active;
 871
 872         ASSERT_RTNL();
 873
 874         old_active = rtnl_dereference(bond->curr_active_slave);
 875
 876         if (old_active == new_active)
 877                 return;
 878
 879         if (new_active) {
 880                 new_active->last_link_up = jiffies;
 881
 882                 if (new_active->link == BOND_LINK_BACK) {
 883                         if (bond_uses_primary(bond)) {
 884                                 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
 885                                            (bond->params.updelay - new_active->delay) * bond->params.miimon);
 886                         }
 887
 888                         new_active->delay = 0;
 889                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
 890                                                   BOND_SLAVE_NOTIFY_NOW);
 891
 892                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 893                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 894
 895                         if (bond_is_lb(bond))
 896                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 897                 } else {
 898                         if (bond_uses_primary(bond)) {
 899                                 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
 900                         }
 901                 }
 902         }
 903
 904         if (bond_uses_primary(bond))
 905                 bond_hw_addr_swap(bond, new_active, old_active);
 906
 907         if (bond_is_lb(bond)) {
 908                 bond_alb_handle_active_change(bond, new_active);
 909                 if (old_active)
 910                         bond_set_slave_inactive_flags(old_active,
 911                                                       BOND_SLAVE_NOTIFY_NOW);
 912                 if (new_active)
 913                         bond_set_slave_active_flags(new_active,
 914                                                     BOND_SLAVE_NOTIFY_NOW);
 915         } else {
 916                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 917         }
 918
 919         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
 920                 if (old_active)
 921                         bond_set_slave_inactive_flags(old_active,
 922                                                       BOND_SLAVE_NOTIFY_NOW);
 923
 924                 if (new_active) {
 925                         bool should_notify_peers = false;
 926
 927                         bond_set_slave_active_flags(new_active,
 928                                                     BOND_SLAVE_NOTIFY_NOW);
 929
 930                         if (bond->params.fail_over_mac)
 931                                 bond_do_fail_over_mac(bond, new_active,
 932                                                       old_active);
 933
 934                         if (netif_running(bond->dev)) {
 935                                 bond->send_peer_notif =
 936                                         bond->params.num_peer_notif *
 937                                         max(1, bond->params.peer_notif_delay);
 938                                 should_notify_peers =
 939                                         bond_should_notify_peers(bond);
 940                         }
 941
 942                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 943                         if (should_notify_peers) {
 944                                 bond->send_peer_notif--;
 945                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 946                                                          bond->dev);
 947                         }
 948                 }
 949         }
 950
 951         /* resend IGMP joins since active slave has changed or
 952          * all were sent on curr_active_slave.
 953          * resend only if bond is brought up with the affected
 954          * bonding modes and the retransmission is enabled
 955          */
 956         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 957             ((bond_uses_primary(bond) && new_active) ||
 958              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
 959                 bond->igmp_retrans = bond->params.resend_igmp;
 960                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 961         }
 962 }
 963
 964 /**
 965  * bond_select_active_slave - select a new active slave, if needed
 966  * @bond: our bonding struct
 967  *
 968  * This functions should be called when one of the following occurs:
 969  * - The old curr_active_slave has been released or lost its link.
 970  * - The primary_slave has got its link back.
 971  * - A slave has got its link back and there's no old curr_active_slave.
 972  *
 973  * Caller must hold RTNL.
 974  */
 975 void bond_select_active_slave(struct bonding *bond)
 976 {
 977         struct slave *best_slave;
 978         int rv;
 979
 980         ASSERT_RTNL();
 981
 982         best_slave = bond_find_best_slave(bond);
 983         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
 984                 bond_change_active_slave(bond, best_slave);
 985                 rv = bond_set_carrier(bond);
 986                 if (!rv)
 987                         return;
 988
 989                 if (netif_carrier_ok(bond->dev))
 990                         netdev_info(bond->dev, "active interface up!\n");
 991                 else
 992                         netdev_info(bond->dev, "now running without any active interface!\n");
 993         }
 994 }
 995
 996 #ifdef CONFIG_NET_POLL_CONTROLLER
 997 static inline int slave_enable_netpoll(struct slave *slave)
 998 {
 999         struct netpoll *np;
1000         int err = 0;
1001
1002         np = kzalloc(sizeof(*np), GFP_KERNEL);
1003         err = -ENOMEM;
1004         if (!np)
1005                 goto out;
1006
1007         err = __netpoll_setup(np, slave->dev);
1008         if (err) {
1009                 kfree(np);
1010                 goto out;
1011         }
1012         slave->np = np;
1013 out:
1014         return err;
1015 }
1016 static inline void slave_disable_netpoll(struct slave *slave)
1017 {
1018         struct netpoll *np = slave->np;
1019
1020         if (!np)
1021                 return;
1022
1023         slave->np = NULL;
1024
1025         __netpoll_free(np);
1026 }
1027
1028 static void bond_poll_controller(struct net_device *bond_dev)
1029 {
1030         struct bonding *bond = netdev_priv(bond_dev);
1031         struct slave *slave = NULL;
1032         struct list_head *iter;
1033         struct ad_info ad_info;
1034
1035         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1036                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
1037                         return;
1038
1039         bond_for_each_slave_rcu(bond, slave, iter) {
1040                 if (!bond_slave_is_up(slave))
1041                         continue;
1042
1043                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1044                         struct aggregator *agg =
1045                             SLAVE_AD_INFO(slave)->port.aggregator;
1046
1047                         if (agg &&
1048                             agg->aggregator_identifier != ad_info.aggregator_id)
1049                                 continue;
1050                 }
1051
1052                 netpoll_poll_dev(slave->dev);
1053         }
1054 }
1055
1056 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1057 {
1058         struct bonding *bond = netdev_priv(bond_dev);
1059         struct list_head *iter;
1060         struct slave *slave;
1061
1062         bond_for_each_slave(bond, slave, iter)
1063                 if (bond_slave_is_up(slave))
1064                         slave_disable_netpoll(slave);
1065 }
1066
1067 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1068 {
1069         struct bonding *bond = netdev_priv(dev);
1070         struct list_head *iter;
1071         struct slave *slave;
1072         int err = 0;
1073
1074         bond_for_each_slave(bond, slave, iter) {
1075                 err = slave_enable_netpoll(slave);
1076                 if (err) {
1077                         bond_netpoll_cleanup(dev);
1078                         break;
1079                 }
1080         }
1081         return err;
1082 }
1083 #else
1084 static inline int slave_enable_netpoll(struct slave *slave)
1085 {
1086         return 0;
1087 }
1088 static inline void slave_disable_netpoll(struct slave *slave)
1089 {
1090 }
1091 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1092 {
1093 }
1094 #endif
1095
1096 /*---------------------------------- IOCTL ----------------------------------*/
1097
1098 static netdev_features_t bond_fix_features(struct net_device *dev,
1099                                            netdev_features_t features)
1100 {
1101         struct bonding *bond = netdev_priv(dev);
1102         struct list_head *iter;
1103         netdev_features_t mask;
1104         struct slave *slave;
1105
1106         mask = features;
1107
1108         features &= ~NETIF_F_ONE_FOR_ALL;
1109         features |= NETIF_F_ALL_FOR_ALL;
1110
1111         bond_for_each_slave(bond, slave, iter) {
1112                 features = netdev_increment_features(features,
1113                                                      slave->dev->features,
1114                                                      mask);
1115         }
1116         features = netdev_add_tso_features(features, mask);
1117
1118         return features;
1119 }
1120
1121 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1122                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1123                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1124
1125 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1126                                  NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1127
1128 #define BOND_MPLS_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1129                                  NETIF_F_ALL_TSO)
1130
1131 static void bond_compute_features(struct bonding *bond)
1132 {
1133         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1134                                         IFF_XMIT_DST_RELEASE_PERM;
1135         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1136         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1137         netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1138         struct net_device *bond_dev = bond->dev;
1139         struct list_head *iter;
1140         struct slave *slave;
1141         unsigned short max_hard_header_len = ETH_HLEN;
1142         unsigned int gso_max_size = GSO_MAX_SIZE;
1143         u16 gso_max_segs = GSO_MAX_SEGS;
1144
1145         if (!bond_has_slaves(bond))
1146                 goto done;
1147         vlan_features &= NETIF_F_ALL_FOR_ALL;
1148         mpls_features &= NETIF_F_ALL_FOR_ALL;
1149
1150         bond_for_each_slave(bond, slave, iter) {
1151                 vlan_features = netdev_increment_features(vlan_features,
1152                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1153
1154                 enc_features = netdev_increment_features(enc_features,
1155                                                          slave->dev->hw_enc_features,
1156                                                          BOND_ENC_FEATURES);
1157
1158                 mpls_features = netdev_increment_features(mpls_features,
1159                                                           slave->dev->mpls_features,
1160                                                           BOND_MPLS_FEATURES);
1161
1162                 dst_release_flag &= slave->dev->priv_flags;
1163                 if (slave->dev->hard_header_len > max_hard_header_len)
1164                         max_hard_header_len = slave->dev->hard_header_len;
1165
1166                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1167                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1168         }
1169         bond_dev->hard_header_len = max_hard_header_len;
1170
1171 done:
1172         bond_dev->vlan_features = vlan_features;
1173         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1174                                     NETIF_F_HW_VLAN_CTAG_TX |
1175                                     NETIF_F_HW_VLAN_STAG_TX |
1176                                     NETIF_F_GSO_UDP_L4;
1177         bond_dev->mpls_features = mpls_features;
1178         bond_dev->gso_max_segs = gso_max_segs;
1179         netif_set_gso_max_size(bond_dev, gso_max_size);
1180
1181         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1182         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1183             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1184                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1185
1186         netdev_change_features(bond_dev);
1187 }
1188
1189 static void bond_setup_by_slave(struct net_device *bond_dev,
1190                                 struct net_device *slave_dev)
1191 {
1192         bond_dev->header_ops        = slave_dev->header_ops;
1193
1194         bond_dev->type              = slave_dev->type;
1195         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1196         bond_dev->addr_len          = slave_dev->addr_len;
1197
1198         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1199                 slave_dev->addr_len);
1200 }
1201
1202 /* On bonding slaves other than the currently active slave, suppress
1203  * duplicates except for alb non-mcast/bcast.
1204  */
1205 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1206                                             struct slave *slave,
1207                                             struct bonding *bond)
1208 {
1209         if (bond_is_slave_inactive(slave)) {
1210                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1211                     skb->pkt_type != PACKET_BROADCAST &&
1212                     skb->pkt_type != PACKET_MULTICAST)
1213                         return false;
1214                 return true;
1215         }
1216         return false;
1217 }
1218
1219 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1220 {
1221         struct sk_buff *skb = *pskb;
1222         struct slave *slave;
1223         struct bonding *bond;
1224         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1225                           struct slave *);
1226         int ret = RX_HANDLER_ANOTHER;
1227
1228         skb = skb_share_check(skb, GFP_ATOMIC);
1229         if (unlikely(!skb))
1230                 return RX_HANDLER_CONSUMED;
1231
1232         *pskb = skb;
1233
1234         slave = bond_slave_get_rcu(skb->dev);
1235         bond = slave->bond;
1236
1237         recv_probe = READ_ONCE(bond->recv_probe);
1238         if (recv_probe) {
1239                 ret = recv_probe(skb, bond, slave);
1240                 if (ret == RX_HANDLER_CONSUMED) {
1241                         consume_skb(skb);
1242                         return ret;
1243                 }
1244         }
1245
1246         /*
1247          * For packets determined by bond_should_deliver_exact_match() call to
1248          * be suppressed we want to make an exception for link-local packets.
1249          * This is necessary for e.g. LLDP daemons to be able to monitor
1250          * inactive slave links without being forced to bind to them
1251          * explicitly.
1252          *
1253          * At the same time, packets that are passed to the bonding master
1254          * (including link-local ones) can have their originating interface
1255          * determined via PACKET_ORIGDEV socket option.
1256          */
1257         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1258                 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1259                         return RX_HANDLER_PASS;
1260                 return RX_HANDLER_EXACT;
1261         }
1262
1263         skb->dev = bond->dev;
1264
1265         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1266             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1267             skb->pkt_type == PACKET_HOST) {
1268
1269                 if (unlikely(skb_cow_head(skb,
1270                                           skb->data - skb_mac_header(skb)))) {
1271                         kfree_skb(skb);
1272                         return RX_HANDLER_CONSUMED;
1273                 }
1274                 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1275                                   bond->dev->addr_len);
1276         }
1277
1278         return ret;
1279 }
1280
1281 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1282 {
1283         switch (BOND_MODE(bond)) {
1284         case BOND_MODE_ROUNDROBIN:
1285                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1286         case BOND_MODE_ACTIVEBACKUP:
1287                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1288         case BOND_MODE_BROADCAST:
1289                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1290         case BOND_MODE_XOR:
1291         case BOND_MODE_8023AD:
1292                 return NETDEV_LAG_TX_TYPE_HASH;
1293         default:
1294                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1295         }
1296 }
1297
1298 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1299                                                enum netdev_lag_tx_type type)
1300 {
1301         if (type != NETDEV_LAG_TX_TYPE_HASH)
1302                 return NETDEV_LAG_HASH_NONE;
1303
1304         switch (bond->params.xmit_policy) {
1305         case BOND_XMIT_POLICY_LAYER2:
1306                 return NETDEV_LAG_HASH_L2;
1307         case BOND_XMIT_POLICY_LAYER34:
1308                 return NETDEV_LAG_HASH_L34;
1309         case BOND_XMIT_POLICY_LAYER23:
1310                 return NETDEV_LAG_HASH_L23;
1311         case BOND_XMIT_POLICY_ENCAP23:
1312                 return NETDEV_LAG_HASH_E23;
1313         case BOND_XMIT_POLICY_ENCAP34:
1314                 return NETDEV_LAG_HASH_E34;
1315         default:
1316                 return NETDEV_LAG_HASH_UNKNOWN;
1317         }
1318 }
1319
1320 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1321                                       struct netlink_ext_ack *extack)
1322 {
1323         struct netdev_lag_upper_info lag_upper_info;
1324         enum netdev_lag_tx_type type;
1325
1326         type = bond_lag_tx_type(bond);
1327         lag_upper_info.tx_type = type;
1328         lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1329
1330         return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1331                                             &lag_upper_info, extack);
1332 }
1333
1334 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1335 {
1336         netdev_upper_dev_unlink(slave->dev, bond->dev);
1337         slave->dev->flags &= ~IFF_SLAVE;
1338 }
1339
1340 static struct slave *bond_alloc_slave(struct bonding *bond)
1341 {
1342         struct slave *slave = NULL;
1343
1344         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1345         if (!slave)
1346                 return NULL;
1347
1348         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1349                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1350                                                GFP_KERNEL);
1351                 if (!SLAVE_AD_INFO(slave)) {
1352                         kfree(slave);
1353                         return NULL;
1354                 }
1355         }
1356         INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1357
1358         return slave;
1359 }
1360
1361 static void bond_free_slave(struct slave *slave)
1362 {
1363         struct bonding *bond = bond_get_bond_by_slave(slave);
1364
1365         cancel_delayed_work_sync(&slave->notify_work);
1366         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1367                 kfree(SLAVE_AD_INFO(slave));
1368
1369         kfree(slave);
1370 }
1371
1372 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1373 {
1374         info->bond_mode = BOND_MODE(bond);
1375         info->miimon = bond->params.miimon;
1376         info->num_slaves = bond->slave_cnt;
1377 }
1378
1379 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1380 {
1381         strcpy(info->slave_name, slave->dev->name);
1382         info->link = slave->link;
1383         info->state = bond_slave_state(slave);
1384         info->link_failure_count = slave->link_failure_count;
1385 }
1386
1387 static void bond_netdev_notify_work(struct work_struct *_work)
1388 {
1389         struct slave *slave = container_of(_work, struct slave,
1390                                            notify_work.work);
1391
1392         if (rtnl_trylock()) {
1393                 struct netdev_bonding_info binfo;
1394
1395                 bond_fill_ifslave(slave, &binfo.slave);
1396                 bond_fill_ifbond(slave->bond, &binfo.master);
1397                 netdev_bonding_info_change(slave->dev, &binfo);
1398                 rtnl_unlock();
1399         } else {
1400                 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1401         }
1402 }
1403
1404 void bond_queue_slave_event(struct slave *slave)
1405 {
1406         queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1407 }
1408
1409 void bond_lower_state_changed(struct slave *slave)
1410 {
1411         struct netdev_lag_lower_state_info info;
1412
1413         info.link_up = slave->link == BOND_LINK_UP ||
1414                        slave->link == BOND_LINK_FAIL;
1415         info.tx_enabled = bond_is_active_slave(slave);
1416         netdev_lower_state_changed(slave->dev, &info);
1417 }
1418
1419 /* enslave device <slave> to bond device <master> */
1420 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1421                  struct netlink_ext_ack *extack)
1422 {
1423         struct bonding *bond = netdev_priv(bond_dev);
1424         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1425         struct slave *new_slave = NULL, *prev_slave;
1426         struct sockaddr_storage ss;
1427         int link_reporting;
1428         int res = 0, i;
1429
1430         if (!bond->params.use_carrier &&
1431             slave_dev->ethtool_ops->get_link == NULL &&
1432             slave_ops->ndo_do_ioctl == NULL) {
1433                 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1434         }
1435
1436         /* already in-use? */
1437         if (netdev_is_rx_handler_busy(slave_dev)) {
1438                 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1439                 slave_err(bond_dev, slave_dev,
1440                           "Error: Device is in use and cannot be enslaved\n");
1441                 return -EBUSY;
1442         }
1443
1444         if (bond_dev == slave_dev) {
1445                 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1446                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1447                 return -EPERM;
1448         }
1449
1450         /* vlan challenged mutual exclusion */
1451         /* no need to lock since we're protected by rtnl_lock */
1452         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1453                 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1454                 if (vlan_uses_dev(bond_dev)) {
1455                         NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1456                         slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1457                         return -EPERM;
1458                 } else {
1459                         slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1460                 }
1461         } else {
1462                 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1463         }
1464
1465         /* Old ifenslave binaries are no longer supported.  These can
1466          * be identified with moderate accuracy by the state of the slave:
1467          * the current ifenslave will set the interface down prior to
1468          * enslaving it; the old ifenslave will not.
1469          */
1470         if (slave_dev->flags & IFF_UP) {
1471                 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1472                 slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1473                 return -EPERM;
1474         }
1475
1476         /* set bonding device ether type by slave - bonding netdevices are
1477          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1478          * there is a need to override some of the type dependent attribs/funcs.
1479          *
1480          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1481          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1482          */
1483         if (!bond_has_slaves(bond)) {
1484                 if (bond_dev->type != slave_dev->type) {
1485                         slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1486                                   bond_dev->type, slave_dev->type);
1487
1488                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1489                                                        bond_dev);
1490                         res = notifier_to_errno(res);
1491                         if (res) {
1492                                 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1493                                 return -EBUSY;
1494                         }
1495
1496                         /* Flush unicast and multicast addresses */
1497                         dev_uc_flush(bond_dev);
1498                         dev_mc_flush(bond_dev);
1499
1500                         if (slave_dev->type != ARPHRD_ETHER)
1501                                 bond_setup_by_slave(bond_dev, slave_dev);
1502                         else {
1503                                 ether_setup(bond_dev);
1504                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1505                         }
1506
1507                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1508                                                  bond_dev);
1509                 }
1510         } else if (bond_dev->type != slave_dev->type) {
1511                 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1512                 slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1513                           slave_dev->type, bond_dev->type);
1514                 return -EINVAL;
1515         }
1516
1517         if (slave_dev->type == ARPHRD_INFINIBAND &&
1518             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1519                 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1520                 slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1521                            slave_dev->type);
1522                 res = -EOPNOTSUPP;
1523                 goto err_undo_flags;
1524         }
1525
1526         if (!slave_ops->ndo_set_mac_address ||
1527             slave_dev->type == ARPHRD_INFINIBAND) {
1528                 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1529                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1530                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1531                         if (!bond_has_slaves(bond)) {
1532                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1533                                 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1534                         } else {
1535                                 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1536                                 slave_err(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1537                                 res = -EOPNOTSUPP;
1538                                 goto err_undo_flags;
1539                         }
1540                 }
1541         }
1542
1543         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1544
1545         /* If this is the first slave, then we need to set the master's hardware
1546          * address to be the same as the slave's.
1547          */
1548         if (!bond_has_slaves(bond) &&
1549             bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1550                 res = bond_set_dev_addr(bond->dev, slave_dev);
1551                 if (res)
1552                         goto err_undo_flags;
1553         }
1554
1555         new_slave = bond_alloc_slave(bond);
1556         if (!new_slave) {
1557                 res = -ENOMEM;
1558                 goto err_undo_flags;
1559         }
1560
1561         new_slave->bond = bond;
1562         new_slave->dev = slave_dev;
1563         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1564          * is set via sysfs or module option if desired.
1565          */
1566         new_slave->queue_id = 0;
1567
1568         /* Save slave's original mtu and then set it to match the bond */
1569         new_slave->original_mtu = slave_dev->mtu;
1570         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1571         if (res) {
1572                 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1573                 goto err_free;
1574         }
1575
1576         /* Save slave's original ("permanent") mac address for modes
1577          * that need it, and for restoring it upon release, and then
1578          * set it to the master's address
1579          */
1580         bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1581                           slave_dev->addr_len);
1582
1583         if (!bond->params.fail_over_mac ||
1584             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1585                 /* Set slave to master's mac address.  The application already
1586                  * set the master's mac address to that of the first slave
1587                  */
1588                 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1589                 ss.ss_family = slave_dev->type;
1590                 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1591                                           extack);
1592                 if (res) {
1593                         slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1594                         goto err_restore_mtu;
1595                 }
1596         }
1597
1598         /* set slave flag before open to prevent IPv6 addrconf */
1599         slave_dev->flags |= IFF_SLAVE;
1600
1601         /* open the slave since the application closed it */
1602         res = dev_open(slave_dev, extack);
1603         if (res) {
1604                 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1605                 goto err_restore_mac;
1606         }
1607
1608         slave_dev->priv_flags |= IFF_BONDING;
1609         /* initialize slave stats */
1610         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1611
1612         if (bond_is_lb(bond)) {
1613                 /* bond_alb_init_slave() must be called before all other stages since
1614                  * it might fail and we do not want to have to undo everything
1615                  */
1616                 res = bond_alb_init_slave(bond, new_slave);
1617                 if (res)
1618                         goto err_close;
1619         }
1620
1621         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1622         if (res) {
1623                 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1624                 goto err_close;
1625         }
1626
1627         prev_slave = bond_last_slave(bond);
1628
1629         new_slave->delay = 0;
1630         new_slave->link_failure_count = 0;
1631
1632         if (bond_update_speed_duplex(new_slave) &&
1633             bond_needs_speed_duplex(bond))
1634                 new_slave->link = BOND_LINK_DOWN;
1635
1636         new_slave->last_rx = jiffies -
1637                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1638         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1639                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1640
1641         if (bond->params.miimon && !bond->params.use_carrier) {
1642                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1643
1644                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1645                         /* miimon is set but a bonded network driver
1646                          * does not support ETHTOOL/MII and
1647                          * arp_interval is not set.  Note: if
1648                          * use_carrier is enabled, we will never go
1649                          * here (because netif_carrier is always
1650                          * supported); thus, we don't need to change
1651                          * the messages for netif_carrier.
1652                          */
1653                         slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n");
1654                 } else if (link_reporting == -1) {
1655                         /* unable get link status using mii/ethtool */
1656                         slave_warn(bond_dev, slave_dev, "can't get link status from slave; 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");
1657                 }
1658         }
1659
1660         /* check for initial state */
1661         new_slave->link = BOND_LINK_NOCHANGE;
1662         if (bond->params.miimon) {
1663                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1664                         if (bond->params.updelay) {
1665                                 bond_set_slave_link_state(new_slave,
1666                                                           BOND_LINK_BACK,
1667                                                           BOND_SLAVE_NOTIFY_NOW);
1668                                 new_slave->delay = bond->params.updelay;
1669                         } else {
1670                                 bond_set_slave_link_state(new_slave,
1671                                                           BOND_LINK_UP,
1672                                                           BOND_SLAVE_NOTIFY_NOW);
1673                         }
1674                 } else {
1675                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1676                                                   BOND_SLAVE_NOTIFY_NOW);
1677                 }
1678         } else if (bond->params.arp_interval) {
1679                 bond_set_slave_link_state(new_slave,
1680                                           (netif_carrier_ok(slave_dev) ?
1681                                           BOND_LINK_UP : BOND_LINK_DOWN),
1682                                           BOND_SLAVE_NOTIFY_NOW);
1683         } else {
1684                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1685                                           BOND_SLAVE_NOTIFY_NOW);
1686         }
1687
1688         if (new_slave->link != BOND_LINK_DOWN)
1689                 new_slave->last_link_up = jiffies;
1690         slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1691                   new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1692                   (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1693
1694         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1695                 /* if there is a primary slave, remember it */
1696                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1697                         rcu_assign_pointer(bond->primary_slave, new_slave);
1698                         bond->force_primary = true;
1699                 }
1700         }
1701
1702         switch (BOND_MODE(bond)) {
1703         case BOND_MODE_ACTIVEBACKUP:
1704                 bond_set_slave_inactive_flags(new_slave,
1705                                               BOND_SLAVE_NOTIFY_NOW);
1706                 break;
1707         case BOND_MODE_8023AD:
1708                 /* in 802.3ad mode, the internal mechanism
1709                  * will activate the slaves in the selected
1710                  * aggregator
1711                  */
1712                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1713                 /* if this is the first slave */
1714                 if (!prev_slave) {
1715                         SLAVE_AD_INFO(new_slave)->id = 1;
1716                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1717                          * can be called only after the mac address of the bond is set
1718                          */
1719                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1720                 } else {
1721                         SLAVE_AD_INFO(new_slave)->id =
1722                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1723                 }
1724
1725                 bond_3ad_bind_slave(new_slave);
1726                 break;
1727         case BOND_MODE_TLB:
1728         case BOND_MODE_ALB:
1729                 bond_set_active_slave(new_slave);
1730                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1731                 break;
1732         default:
1733                 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1734
1735                 /* always active in trunk mode */
1736                 bond_set_active_slave(new_slave);
1737
1738                 /* In trunking mode there is little meaning to curr_active_slave
1739                  * anyway (it holds no special properties of the bond device),
1740                  * so we can change it without calling change_active_interface()
1741                  */
1742                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1743                     new_slave->link == BOND_LINK_UP)
1744                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1745
1746                 break;
1747         } /* switch(bond_mode) */
1748
1749 #ifdef CONFIG_NET_POLL_CONTROLLER
1750         if (bond->dev->npinfo) {
1751                 if (slave_enable_netpoll(new_slave)) {
1752                         slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1753                         res = -EBUSY;
1754                         goto err_detach;
1755                 }
1756         }
1757 #endif
1758
1759         if (!(bond_dev->features & NETIF_F_LRO))
1760                 dev_disable_lro(slave_dev);
1761
1762         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1763                                          new_slave);
1764         if (res) {
1765                 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1766                 goto err_detach;
1767         }
1768
1769         res = bond_master_upper_dev_link(bond, new_slave, extack);
1770         if (res) {
1771                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1772                 goto err_unregister;
1773         }
1774
1775         res = bond_sysfs_slave_add(new_slave);
1776         if (res) {
1777                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1778                 goto err_upper_unlink;
1779         }
1780
1781         /* If the mode uses primary, then the following is handled by
1782          * bond_change_active_slave().
1783          */
1784         if (!bond_uses_primary(bond)) {
1785                 /* set promiscuity level to new slave */
1786                 if (bond_dev->flags & IFF_PROMISC) {
1787                         res = dev_set_promiscuity(slave_dev, 1);
1788                         if (res)
1789                                 goto err_sysfs_del;
1790                 }
1791
1792                 /* set allmulti level to new slave */
1793                 if (bond_dev->flags & IFF_ALLMULTI) {
1794                         res = dev_set_allmulti(slave_dev, 1);
1795                         if (res) {
1796                                 if (bond_dev->flags & IFF_PROMISC)
1797                                         dev_set_promiscuity(slave_dev, -1);
1798                                 goto err_sysfs_del;
1799                         }
1800                 }
1801
1802                 netif_addr_lock_bh(bond_dev);
1803                 dev_mc_sync_multiple(slave_dev, bond_dev);
1804                 dev_uc_sync_multiple(slave_dev, bond_dev);
1805                 netif_addr_unlock_bh(bond_dev);
1806
1807                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1808                         /* add lacpdu mc addr to mc list */
1809                         u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1810
1811                         dev_mc_add(slave_dev, lacpdu_multicast);
1812                 }
1813         }
1814
1815         bond->slave_cnt++;
1816         bond_compute_features(bond);
1817         bond_set_carrier(bond);
1818
1819         if (bond_uses_primary(bond)) {
1820                 block_netpoll_tx();
1821                 bond_select_active_slave(bond);
1822                 unblock_netpoll_tx();
1823         }
1824
1825         if (bond_mode_can_use_xmit_hash(bond))
1826                 bond_update_slave_arr(bond, NULL);
1827
1828
1829         slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
1830                    bond_is_active_slave(new_slave) ? "an active" : "a backup",
1831                    new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1832
1833         /* enslave is successful */
1834         bond_queue_slave_event(new_slave);
1835         return 0;
1836
1837 /* Undo stages on error */
1838 err_sysfs_del:
1839         bond_sysfs_slave_del(new_slave);
1840
1841 err_upper_unlink:
1842         bond_upper_dev_unlink(bond, new_slave);
1843
1844 err_unregister:
1845         netdev_rx_handler_unregister(slave_dev);
1846
1847 err_detach:
1848         vlan_vids_del_by_dev(slave_dev, bond_dev);
1849         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1850                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1851         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1852                 block_netpoll_tx();
1853                 bond_change_active_slave(bond, NULL);
1854                 bond_select_active_slave(bond);
1855                 unblock_netpoll_tx();
1856         }
1857         /* either primary_slave or curr_active_slave might've changed */
1858         synchronize_rcu();
1859         slave_disable_netpoll(new_slave);
1860
1861 err_close:
1862         if (!netif_is_bond_master(slave_dev))
1863                 slave_dev->priv_flags &= ~IFF_BONDING;
1864         dev_close(slave_dev);
1865
1866 err_restore_mac:
1867         slave_dev->flags &= ~IFF_SLAVE;
1868         if (!bond->params.fail_over_mac ||
1869             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1870                 /* XXX TODO - fom follow mode needs to change master's
1871                  * MAC if this slave's MAC is in use by the bond, or at
1872                  * least print a warning.
1873                  */
1874                 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
1875                                   new_slave->dev->addr_len);
1876                 ss.ss_family = slave_dev->type;
1877                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
1878         }
1879
1880 err_restore_mtu:
1881         dev_set_mtu(slave_dev, new_slave->original_mtu);
1882
1883 err_free:
1884         bond_free_slave(new_slave);
1885
1886 err_undo_flags:
1887         /* Enslave of first slave has failed and we need to fix master's mac */
1888         if (!bond_has_slaves(bond)) {
1889                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1890                                             slave_dev->dev_addr))
1891                         eth_hw_addr_random(bond_dev);
1892                 if (bond_dev->type != ARPHRD_ETHER) {
1893                         dev_close(bond_dev);
1894                         ether_setup(bond_dev);
1895                         bond_dev->flags |= IFF_MASTER;
1896                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1897                 }
1898         }
1899
1900         return res;
1901 }
1902
1903 /* Try to release the slave device <slave> from the bond device <master>
1904  * It is legal to access curr_active_slave without a lock because all the function
1905  * is RTNL-locked. If "all" is true it means that the function is being called
1906  * while destroying a bond interface and all slaves are being released.
1907  *
1908  * The rules for slave state should be:
1909  *   for Active/Backup:
1910  *     Active stays on all backups go down
1911  *   for Bonded connections:
1912  *     The first up interface should be left on and all others downed.
1913  */
1914 static int __bond_release_one(struct net_device *bond_dev,
1915                               struct net_device *slave_dev,
1916                               bool all, bool unregister)
1917 {
1918         struct bonding *bond = netdev_priv(bond_dev);
1919         struct slave *slave, *oldcurrent;
1920         struct sockaddr_storage ss;
1921         int old_flags = bond_dev->flags;
1922         netdev_features_t old_features = bond_dev->features;
1923
1924         /* slave is not a slave or master is not master of this slave */
1925         if (!(slave_dev->flags & IFF_SLAVE) ||
1926             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1927                 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
1928                 return -EINVAL;
1929         }
1930
1931         block_netpoll_tx();
1932
1933         slave = bond_get_slave_by_dev(bond, slave_dev);
1934         if (!slave) {
1935                 /* not a slave of this bond */
1936                 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
1937                 unblock_netpoll_tx();
1938                 return -EINVAL;
1939         }
1940
1941         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1942
1943         bond_sysfs_slave_del(slave);
1944
1945         /* recompute stats just before removing the slave */
1946         bond_get_stats(bond->dev, &bond->bond_stats);
1947
1948         bond_upper_dev_unlink(bond, slave);
1949         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1950          * for this slave anymore.
1951          */
1952         netdev_rx_handler_unregister(slave_dev);
1953
1954         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1955                 bond_3ad_unbind_slave(slave);
1956
1957         if (bond_mode_can_use_xmit_hash(bond))
1958                 bond_update_slave_arr(bond, slave);
1959
1960         slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
1961                     bond_is_active_slave(slave) ? "active" : "backup");
1962
1963         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1964
1965         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1966
1967         if (!all && (!bond->params.fail_over_mac ||
1968                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1969                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1970                     bond_has_slaves(bond))
1971                         slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n",
1972                                    slave->perm_hwaddr);
1973         }
1974
1975         if (rtnl_dereference(bond->primary_slave) == slave)
1976                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1977
1978         if (oldcurrent == slave)
1979                 bond_change_active_slave(bond, NULL);
1980
1981         if (bond_is_lb(bond)) {
1982                 /* Must be called only after the slave has been
1983                  * detached from the list and the curr_active_slave
1984                  * has been cleared (if our_slave == old_current),
1985                  * but before a new active slave is selected.
1986                  */
1987                 bond_alb_deinit_slave(bond, slave);
1988         }
1989
1990         if (all) {
1991                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1992         } else if (oldcurrent == slave) {
1993                 /* Note that we hold RTNL over this sequence, so there
1994                  * is no concern that another slave add/remove event
1995                  * will interfere.
1996                  */
1997                 bond_select_active_slave(bond);
1998         }
1999
2000         if (!bond_has_slaves(bond)) {
2001                 bond_set_carrier(bond);
2002                 eth_hw_addr_random(bond_dev);
2003         }
2004
2005         unblock_netpoll_tx();
2006         synchronize_rcu();
2007         bond->slave_cnt--;
2008
2009         if (!bond_has_slaves(bond)) {
2010                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2011                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2012         }
2013
2014         bond_compute_features(bond);
2015         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2016             (old_features & NETIF_F_VLAN_CHALLENGED))
2017                 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2018
2019         vlan_vids_del_by_dev(slave_dev, bond_dev);
2020
2021         /* If the mode uses primary, then this case was handled above by
2022          * bond_change_active_slave(..., NULL)
2023          */
2024         if (!bond_uses_primary(bond)) {
2025                 /* unset promiscuity level from slave
2026                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
2027                  * of the IFF_PROMISC flag in the bond_dev, but we need the
2028                  * value of that flag before that change, as that was the value
2029                  * when this slave was attached, so we cache at the start of the
2030                  * function and use it here. Same goes for ALLMULTI below
2031                  */
2032                 if (old_flags & IFF_PROMISC)
2033                         dev_set_promiscuity(slave_dev, -1);
2034
2035                 /* unset allmulti level from slave */
2036                 if (old_flags & IFF_ALLMULTI)
2037                         dev_set_allmulti(slave_dev, -1);
2038
2039                 bond_hw_addr_flush(bond_dev, slave_dev);
2040         }
2041
2042         slave_disable_netpoll(slave);
2043
2044         /* close slave before restoring its mac address */
2045         dev_close(slave_dev);
2046
2047         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2048             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2049                 /* restore original ("permanent") mac address */
2050                 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2051                                   slave->dev->addr_len);
2052                 ss.ss_family = slave_dev->type;
2053                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2054         }
2055
2056         if (unregister)
2057                 __dev_set_mtu(slave_dev, slave->original_mtu);
2058         else
2059                 dev_set_mtu(slave_dev, slave->original_mtu);
2060
2061         if (!netif_is_bond_master(slave_dev))
2062                 slave_dev->priv_flags &= ~IFF_BONDING;
2063
2064         bond_free_slave(slave);
2065
2066         return 0;
2067 }
2068
2069 /* A wrapper used because of ndo_del_link */
2070 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2071 {
2072         return __bond_release_one(bond_dev, slave_dev, false, false);
2073 }
2074
2075 /* First release a slave and then destroy the bond if no more slaves are left.
2076  * Must be under rtnl_lock when this function is called.
2077  */
2078 static int bond_release_and_destroy(struct net_device *bond_dev,
2079                                     struct net_device *slave_dev)
2080 {
2081         struct bonding *bond = netdev_priv(bond_dev);
2082         int ret;
2083
2084         ret = __bond_release_one(bond_dev, slave_dev, false, true);
2085         if (ret == 0 && !bond_has_slaves(bond)) {
2086                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2087                 netdev_info(bond_dev, "Destroying bond\n");
2088                 bond_remove_proc_entry(bond);
2089                 unregister_netdevice(bond_dev);
2090         }
2091         return ret;
2092 }
2093
2094 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2095 {
2096         struct bonding *bond = netdev_priv(bond_dev);
2097         bond_fill_ifbond(bond, info);
2098 }
2099
2100 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2101 {
2102         struct bonding *bond = netdev_priv(bond_dev);
2103         struct list_head *iter;
2104         int i = 0, res = -ENODEV;
2105         struct slave *slave;
2106
2107         bond_for_each_slave(bond, slave, iter) {
2108                 if (i++ == (int)info->slave_id) {
2109                         res = 0;
2110                         bond_fill_ifslave(slave, info);
2111                         break;
2112                 }
2113         }
2114
2115         return res;
2116 }
2117
2118 /*-------------------------------- Monitoring -------------------------------*/
2119
2120 /* called with rcu_read_lock() */
2121 static int bond_miimon_inspect(struct bonding *bond)
2122 {
2123         int link_state, commit = 0;
2124         struct list_head *iter;
2125         struct slave *slave;
2126         bool ignore_updelay;
2127
2128         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2129
2130         bond_for_each_slave_rcu(bond, slave, iter) {
2131                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2132
2133                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2134
2135                 switch (slave->link) {
2136                 case BOND_LINK_UP:
2137                         if (link_state)
2138                                 continue;
2139
2140                         bond_propose_link_state(slave, BOND_LINK_FAIL);
2141                         commit++;
2142                         slave->delay = bond->params.downdelay;
2143                         if (slave->delay) {
2144                                 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2145                                            (BOND_MODE(bond) ==
2146                                             BOND_MODE_ACTIVEBACKUP) ?
2147                                             (bond_is_active_slave(slave) ?
2148                                              "active " : "backup ") : "",
2149                                            bond->params.downdelay * bond->params.miimon);
2150                         }
2151                         /*FALLTHRU*/
2152                 case BOND_LINK_FAIL:
2153                         if (link_state) {
2154                                 /* recovered before downdelay expired */
2155                                 bond_propose_link_state(slave, BOND_LINK_UP);
2156                                 slave->last_link_up = jiffies;
2157                                 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2158                                            (bond->params.downdelay - slave->delay) *
2159                                            bond->params.miimon);
2160                                 commit++;
2161                                 continue;
2162                         }
2163
2164                         if (slave->delay <= 0) {
2165                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2166                                 commit++;
2167                                 continue;
2168                         }
2169
2170                         slave->delay--;
2171                         break;
2172
2173                 case BOND_LINK_DOWN:
2174                         if (!link_state)
2175                                 continue;
2176
2177                         bond_propose_link_state(slave, BOND_LINK_BACK);
2178                         commit++;
2179                         slave->delay = bond->params.updelay;
2180
2181                         if (slave->delay) {
2182                                 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2183                                            ignore_updelay ? 0 :
2184                                            bond->params.updelay *
2185                                            bond->params.miimon);
2186                         }
2187                         /*FALLTHRU*/
2188                 case BOND_LINK_BACK:
2189                         if (!link_state) {
2190                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2191                                 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2192                                            (bond->params.updelay - slave->delay) *
2193                                            bond->params.miimon);
2194                                 commit++;
2195                                 continue;
2196                         }
2197
2198                         if (ignore_updelay)
2199                                 slave->delay = 0;
2200
2201                         if (slave->delay <= 0) {
2202                                 bond_propose_link_state(slave, BOND_LINK_UP);
2203                                 commit++;
2204                                 ignore_updelay = false;
2205                                 continue;
2206                         }
2207
2208                         slave->delay--;
2209                         break;
2210                 }
2211         }
2212
2213         return commit;
2214 }
2215
2216 static void bond_miimon_link_change(struct bonding *bond,
2217                                     struct slave *slave,
2218                                     char link)
2219 {
2220         switch (BOND_MODE(bond)) {
2221         case BOND_MODE_8023AD:
2222                 bond_3ad_handle_link_change(slave, link);
2223                 break;
2224         case BOND_MODE_TLB:
2225         case BOND_MODE_ALB:
2226                 bond_alb_handle_link_change(bond, slave, link);
2227                 break;
2228         case BOND_MODE_XOR:
2229                 bond_update_slave_arr(bond, NULL);
2230                 break;
2231         }
2232 }
2233
2234 static void bond_miimon_commit(struct bonding *bond)
2235 {
2236         struct list_head *iter;
2237         struct slave *slave, *primary;
2238
2239         bond_for_each_slave(bond, slave, iter) {
2240                 switch (slave->link_new_state) {
2241                 case BOND_LINK_NOCHANGE:
2242                         /* For 802.3ad mode, check current slave speed and
2243                          * duplex again in case its port was disabled after
2244                          * invalid speed/duplex reporting but recovered before
2245                          * link monitoring could make a decision on the actual
2246                          * link status
2247                          */
2248                         if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2249                             slave->link == BOND_LINK_UP)
2250                                 bond_3ad_adapter_speed_duplex_changed(slave);
2251                         continue;
2252
2253                 case BOND_LINK_UP:
2254                         if (bond_update_speed_duplex(slave) &&
2255                             bond_needs_speed_duplex(bond)) {
2256                                 slave->link = BOND_LINK_DOWN;
2257                                 if (net_ratelimit())
2258                                         slave_warn(bond->dev, slave->dev,
2259                                                    "failed to get link speed/duplex\n");
2260                                 continue;
2261                         }
2262                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2263                                                   BOND_SLAVE_NOTIFY_NOW);
2264                         slave->last_link_up = jiffies;
2265
2266                         primary = rtnl_dereference(bond->primary_slave);
2267                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2268                                 /* prevent it from being the active one */
2269                                 bond_set_backup_slave(slave);
2270                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2271                                 /* make it immediately active */
2272                                 bond_set_active_slave(slave);
2273                         } else if (slave != primary) {
2274                                 /* prevent it from being the active one */
2275                                 bond_set_backup_slave(slave);
2276                         }
2277
2278                         slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2279                                    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2280                                    slave->duplex ? "full" : "half");
2281
2282                         bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2283
2284                         if (!bond->curr_active_slave || slave == primary)
2285                                 goto do_failover;
2286
2287                         continue;
2288
2289                 case BOND_LINK_DOWN:
2290                         if (slave->link_failure_count < UINT_MAX)
2291                                 slave->link_failure_count++;
2292
2293                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2294                                                   BOND_SLAVE_NOTIFY_NOW);
2295
2296                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2297                             BOND_MODE(bond) == BOND_MODE_8023AD)
2298                                 bond_set_slave_inactive_flags(slave,
2299                                                               BOND_SLAVE_NOTIFY_NOW);
2300
2301                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2302
2303                         bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2304
2305                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2306                                 goto do_failover;
2307
2308                         continue;
2309
2310                 default:
2311                         slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2312                                   slave->link_new_state);
2313                         bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2314
2315                         continue;
2316                 }
2317
2318 do_failover:
2319                 block_netpoll_tx();
2320                 bond_select_active_slave(bond);
2321                 unblock_netpoll_tx();
2322         }
2323
2324         bond_set_carrier(bond);
2325 }
2326
2327 /* bond_mii_monitor
2328  *
2329  * Really a wrapper that splits the mii monitor into two phases: an
2330  * inspection, then (if inspection indicates something needs to be done)
2331  * an acquisition of appropriate locks followed by a commit phase to
2332  * implement whatever link state changes are indicated.
2333  */
2334 static void bond_mii_monitor(struct work_struct *work)
2335 {
2336         struct bonding *bond = container_of(work, struct bonding,
2337                                             mii_work.work);
2338         bool should_notify_peers = false;
2339         bool commit;
2340         unsigned long delay;
2341         struct slave *slave;
2342         struct list_head *iter;
2343
2344         delay = msecs_to_jiffies(bond->params.miimon);
2345
2346         if (!bond_has_slaves(bond))
2347                 goto re_arm;
2348
2349         rcu_read_lock();
2350         should_notify_peers = bond_should_notify_peers(bond);
2351         commit = !!bond_miimon_inspect(bond);
2352         if (bond->send_peer_notif) {
2353                 rcu_read_unlock();
2354                 if (rtnl_trylock()) {
2355                         bond->send_peer_notif--;
2356                         rtnl_unlock();
2357                 }
2358         } else {
2359                 rcu_read_unlock();
2360         }
2361
2362         if (commit) {
2363                 /* Race avoidance with bond_close cancel of workqueue */
2364                 if (!rtnl_trylock()) {
2365                         delay = 1;
2366                         should_notify_peers = false;
2367                         goto re_arm;
2368                 }
2369
2370                 bond_for_each_slave(bond, slave, iter) {
2371                         bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2372                 }
2373                 bond_miimon_commit(bond);
2374
2375                 rtnl_unlock();  /* might sleep, hold no other locks */
2376         }
2377
2378 re_arm:
2379         if (bond->params.miimon)
2380                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2381
2382         if (should_notify_peers) {
2383                 if (!rtnl_trylock())
2384                         return;
2385                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2386                 rtnl_unlock();
2387         }
2388 }
2389
2390 static int bond_upper_dev_walk(struct net_device *upper, void *data)
2391 {
2392         __be32 ip = *((__be32 *)data);
2393
2394         return ip == bond_confirm_addr(upper, 0, ip);
2395 }
2396
2397 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2398 {
2399         bool ret = false;
2400
2401         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2402                 return true;
2403
2404         rcu_read_lock();
2405         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2406                 ret = true;
2407         rcu_read_unlock();
2408
2409         return ret;
2410 }
2411
2412 /* We go to the (large) trouble of VLAN tagging ARP frames because
2413  * switches in VLAN mode (especially if ports are configured as
2414  * "native" to a VLAN) might not pass non-tagged frames.
2415  */
2416 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2417                           __be32 src_ip, struct bond_vlan_tag *tags)
2418 {
2419         struct sk_buff *skb;
2420         struct bond_vlan_tag *outer_tag = tags;
2421         struct net_device *slave_dev = slave->dev;
2422         struct net_device *bond_dev = slave->bond->dev;
2423
2424         slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2425                   arp_op, &dest_ip, &src_ip);
2426
2427         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2428                          NULL, slave_dev->dev_addr, NULL);
2429
2430         if (!skb) {
2431                 net_err_ratelimited("ARP packet allocation failed\n");
2432                 return;
2433         }
2434
2435         if (!tags || tags->vlan_proto == VLAN_N_VID)
2436                 goto xmit;
2437
2438         tags++;
2439
2440         /* Go through all the tags backwards and add them to the packet */
2441         while (tags->vlan_proto != VLAN_N_VID) {
2442                 if (!tags->vlan_id) {
2443                         tags++;
2444                         continue;
2445                 }
2446
2447                 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2448                           ntohs(outer_tag->vlan_proto), tags->vlan_id);
2449                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2450                                                 tags->vlan_id);
2451                 if (!skb) {
2452                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2453                         return;
2454                 }
2455
2456                 tags++;
2457         }
2458         /* Set the outer tag */
2459         if (outer_tag->vlan_id) {
2460                 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2461                           ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2462                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2463                                        outer_tag->vlan_id);
2464         }
2465
2466 xmit:
2467         arp_xmit(skb);
2468 }
2469
2470 /* Validate the device path between the @start_dev and the @end_dev.
2471  * The path is valid if the @end_dev is reachable through device
2472  * stacking.
2473  * When the path is validated, collect any vlan information in the
2474  * path.
2475  */
2476 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2477                                               struct net_device *end_dev,
2478                                               int level)
2479 {
2480         struct bond_vlan_tag *tags;
2481         struct net_device *upper;
2482         struct list_head  *iter;
2483
2484         if (start_dev == end_dev) {
2485                 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2486                 if (!tags)
2487                         return ERR_PTR(-ENOMEM);
2488                 tags[level].vlan_proto = VLAN_N_VID;
2489                 return tags;
2490         }
2491
2492         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2493                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2494                 if (IS_ERR_OR_NULL(tags)) {
2495                         if (IS_ERR(tags))
2496                                 return tags;
2497                         continue;
2498                 }
2499                 if (is_vlan_dev(upper)) {
2500                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2501                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2502                 }
2503
2504                 return tags;
2505         }
2506
2507         return NULL;
2508 }
2509
2510 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2511 {
2512         struct rtable *rt;
2513         struct bond_vlan_tag *tags;
2514         __be32 *targets = bond->params.arp_targets, addr;
2515         int i;
2516
2517         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2518                 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2519                           __func__, &targets[i]);
2520                 tags = NULL;
2521
2522                 /* Find out through which dev should the packet go */
2523                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2524                                      RTO_ONLINK, 0);
2525                 if (IS_ERR(rt)) {
2526                         /* there's no route to target - try to send arp
2527                          * probe to generate any traffic (arp_validate=0)
2528                          */
2529                         if (bond->params.arp_validate)
2530                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2531                                                      bond->dev->name,
2532                                                      &targets[i]);
2533                         bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2534                                       0, tags);
2535                         continue;
2536                 }
2537
2538                 /* bond device itself */
2539                 if (rt->dst.dev == bond->dev)
2540                         goto found;
2541
2542                 rcu_read_lock();
2543                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2544                 rcu_read_unlock();
2545
2546                 if (!IS_ERR_OR_NULL(tags))
2547                         goto found;
2548
2549                 /* Not our device - skip */
2550                 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2551                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2552
2553                 ip_rt_put(rt);
2554                 continue;
2555
2556 found:
2557                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2558                 ip_rt_put(rt);
2559                 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2560                 kfree(tags);
2561         }
2562 }
2563
2564 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2565 {
2566         int i;
2567
2568         if (!sip || !bond_has_this_ip(bond, tip)) {
2569                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2570                            __func__, &sip, &tip);
2571                 return;
2572         }
2573
2574         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2575         if (i == -1) {
2576                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2577                            __func__, &sip);
2578                 return;
2579         }
2580         slave->last_rx = jiffies;
2581         slave->target_last_arp_rx[i] = jiffies;
2582 }
2583
2584 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2585                  struct slave *slave)
2586 {
2587         struct arphdr *arp = (struct arphdr *)skb->data;
2588         struct slave *curr_active_slave, *curr_arp_slave;
2589         unsigned char *arp_ptr;
2590         __be32 sip, tip;
2591         int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2592         unsigned int alen;
2593
2594         if (!slave_do_arp_validate(bond, slave)) {
2595                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2596                     !slave_do_arp_validate_only(bond))
2597                         slave->last_rx = jiffies;
2598                 return RX_HANDLER_ANOTHER;
2599         } else if (!is_arp) {
2600                 return RX_HANDLER_ANOTHER;
2601         }
2602
2603         alen = arp_hdr_len(bond->dev);
2604
2605         slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2606                    __func__, skb->dev->name);
2607
2608         if (alen > skb_headlen(skb)) {
2609                 arp = kmalloc(alen, GFP_ATOMIC);
2610                 if (!arp)
2611                         goto out_unlock;
2612                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2613                         goto out_unlock;
2614         }
2615
2616         if (arp->ar_hln != bond->dev->addr_len ||
2617             skb->pkt_type == PACKET_OTHERHOST ||
2618             skb->pkt_type == PACKET_LOOPBACK ||
2619             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2620             arp->ar_pro != htons(ETH_P_IP) ||
2621             arp->ar_pln != 4)
2622                 goto out_unlock;
2623
2624         arp_ptr = (unsigned char *)(arp + 1);
2625         arp_ptr += bond->dev->addr_len;
2626         memcpy(&sip, arp_ptr, 4);
2627         arp_ptr += 4 + bond->dev->addr_len;
2628         memcpy(&tip, arp_ptr, 4);
2629
2630         slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2631                   __func__, slave->dev->name, bond_slave_state(slave),
2632                   bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2633                   &sip, &tip);
2634
2635         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2636         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2637
2638         /* We 'trust' the received ARP enough to validate it if:
2639          *
2640          * (a) the slave receiving the ARP is active (which includes the
2641          * current ARP slave, if any), or
2642          *
2643          * (b) the receiving slave isn't active, but there is a currently
2644          * active slave and it received valid arp reply(s) after it became
2645          * the currently active slave, or
2646          *
2647          * (c) there is an ARP slave that sent an ARP during the prior ARP
2648          * interval, and we receive an ARP reply on any slave.  We accept
2649          * these because switch FDB update delays may deliver the ARP
2650          * reply to a slave other than the sender of the ARP request.
2651          *
2652          * Note: for (b), backup slaves are receiving the broadcast ARP
2653          * request, not a reply.  This request passes from the sending
2654          * slave through the L2 switch(es) to the receiving slave.  Since
2655          * this is checking the request, sip/tip are swapped for
2656          * validation.
2657          *
2658          * This is done to avoid endless looping when we can't reach the
2659          * arp_ip_target and fool ourselves with our own arp requests.
2660          */
2661         if (bond_is_active_slave(slave))
2662                 bond_validate_arp(bond, slave, sip, tip);
2663         else if (curr_active_slave &&
2664                  time_after(slave_last_rx(bond, curr_active_slave),
2665                             curr_active_slave->last_link_up))
2666                 bond_validate_arp(bond, slave, tip, sip);
2667         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2668                  bond_time_in_interval(bond,
2669                                        dev_trans_start(curr_arp_slave->dev), 1))
2670                 bond_validate_arp(bond, slave, sip, tip);
2671
2672 out_unlock:
2673         if (arp != (struct arphdr *)skb->data)
2674                 kfree(arp);
2675         return RX_HANDLER_ANOTHER;
2676 }
2677
2678 /* function to verify if we're in the arp_interval timeslice, returns true if
2679  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2680  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2681  */
2682 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2683                                   int mod)
2684 {
2685         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2686
2687         return time_in_range(jiffies,
2688                              last_act - delta_in_ticks,
2689                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2690 }
2691
2692 /* This function is called regularly to monitor each slave's link
2693  * ensuring that traffic is being sent and received when arp monitoring
2694  * is used in load-balancing mode. if the adapter has been dormant, then an
2695  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2696  * arp monitoring in active backup mode.
2697  */
2698 static void bond_loadbalance_arp_mon(struct bonding *bond)
2699 {
2700         struct slave *slave, *oldcurrent;
2701         struct list_head *iter;
2702         int do_failover = 0, slave_state_changed = 0;
2703
2704         if (!bond_has_slaves(bond))
2705                 goto re_arm;
2706
2707         rcu_read_lock();
2708
2709         oldcurrent = rcu_dereference(bond->curr_active_slave);
2710         /* see if any of the previous devices are up now (i.e. they have
2711          * xmt and rcv traffic). the curr_active_slave does not come into
2712          * the picture unless it is null. also, slave->last_link_up is not
2713          * needed here because we send an arp on each slave and give a slave
2714          * as long as it needs to get the tx/rx within the delta.
2715          * TODO: what about up/down delay in arp mode? it wasn't here before
2716          *       so it can wait
2717          */
2718         bond_for_each_slave_rcu(bond, slave, iter) {
2719                 unsigned long trans_start = dev_trans_start(slave->dev);
2720
2721                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2722
2723                 if (slave->link != BOND_LINK_UP) {
2724                         if (bond_time_in_interval(bond, trans_start, 1) &&
2725                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2726
2727                                 bond_propose_link_state(slave, BOND_LINK_UP);
2728                                 slave_state_changed = 1;
2729
2730                                 /* primary_slave has no meaning in round-robin
2731                                  * mode. the window of a slave being up and
2732                                  * curr_active_slave being null after enslaving
2733                                  * is closed.
2734                                  */
2735                                 if (!oldcurrent) {
2736                                         slave_info(bond->dev, slave->dev, "link status definitely up\n");
2737                                         do_failover = 1;
2738                                 } else {
2739                                         slave_info(bond->dev, slave->dev, "interface is now up\n");
2740                                 }
2741                         }
2742                 } else {
2743                         /* slave->link == BOND_LINK_UP */
2744
2745                         /* not all switches will respond to an arp request
2746                          * when the source ip is 0, so don't take the link down
2747                          * if we don't know our ip yet
2748                          */
2749                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2750                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2751
2752                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2753                                 slave_state_changed = 1;
2754
2755                                 if (slave->link_failure_count < UINT_MAX)
2756                                         slave->link_failure_count++;
2757
2758                                 slave_info(bond->dev, slave->dev, "interface is now down\n");
2759
2760                                 if (slave == oldcurrent)
2761                                         do_failover = 1;
2762                         }
2763                 }
2764
2765                 /* note: if switch is in round-robin mode, all links
2766                  * must tx arp to ensure all links rx an arp - otherwise
2767                  * links may oscillate or not come up at all; if switch is
2768                  * in something like xor mode, there is nothing we can
2769                  * do - all replies will be rx'ed on same link causing slaves
2770                  * to be unstable during low/no traffic periods
2771                  */
2772                 if (bond_slave_is_up(slave))
2773                         bond_arp_send_all(bond, slave);
2774         }
2775
2776         rcu_read_unlock();
2777
2778         if (do_failover || slave_state_changed) {
2779                 if (!rtnl_trylock())
2780                         goto re_arm;
2781
2782                 bond_for_each_slave(bond, slave, iter) {
2783                         if (slave->link_new_state != BOND_LINK_NOCHANGE)
2784                                 slave->link = slave->link_new_state;
2785                 }
2786
2787                 if (slave_state_changed) {
2788                         bond_slave_state_change(bond);
2789                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2790                                 bond_update_slave_arr(bond, NULL);
2791                 }
2792                 if (do_failover) {
2793                         block_netpoll_tx();
2794                         bond_select_active_slave(bond);
2795                         unblock_netpoll_tx();
2796                 }
2797                 rtnl_unlock();
2798         }
2799
2800 re_arm:
2801         if (bond->params.arp_interval)
2802                 queue_delayed_work(bond->wq, &bond->arp_work,
2803                                    msecs_to_jiffies(bond->params.arp_interval));
2804 }
2805
2806 /* Called to inspect slaves for active-backup mode ARP monitor link state
2807  * changes.  Sets proposed link state in slaves to specify what action
2808  * should take place for the slave.  Returns 0 if no changes are found, >0
2809  * if changes to link states must be committed.
2810  *
2811  * Called with rcu_read_lock held.
2812  */
2813 static int bond_ab_arp_inspect(struct bonding *bond)
2814 {
2815         unsigned long trans_start, last_rx;
2816         struct list_head *iter;
2817         struct slave *slave;
2818         int commit = 0;
2819
2820         bond_for_each_slave_rcu(bond, slave, iter) {
2821                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2822                 last_rx = slave_last_rx(bond, slave);
2823
2824                 if (slave->link != BOND_LINK_UP) {
2825                         if (bond_time_in_interval(bond, last_rx, 1)) {
2826                                 bond_propose_link_state(slave, BOND_LINK_UP);
2827                                 commit++;
2828                         }
2829                         continue;
2830                 }
2831
2832                 /* Give slaves 2*delta after being enslaved or made
2833                  * active.  This avoids bouncing, as the last receive
2834                  * times need a full ARP monitor cycle to be updated.
2835                  */
2836                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2837                         continue;
2838
2839                 /* Backup slave is down if:
2840                  * - No current_arp_slave AND
2841                  * - more than 3*delta since last receive AND
2842                  * - the bond has an IP address
2843                  *
2844                  * Note: a non-null current_arp_slave indicates
2845                  * the curr_active_slave went down and we are
2846                  * searching for a new one; under this condition
2847                  * we only take the curr_active_slave down - this
2848                  * gives each slave a chance to tx/rx traffic
2849                  * before being taken out
2850                  */
2851                 if (!bond_is_active_slave(slave) &&
2852                     !rcu_access_pointer(bond->current_arp_slave) &&
2853                     !bond_time_in_interval(bond, last_rx, 3)) {
2854                         bond_propose_link_state(slave, BOND_LINK_DOWN);
2855                         commit++;
2856                 }
2857
2858                 /* Active slave is down if:
2859                  * - more than 2*delta since transmitting OR
2860                  * - (more than 2*delta since receive AND
2861                  *    the bond has an IP address)
2862                  */
2863                 trans_start = dev_trans_start(slave->dev);
2864                 if (bond_is_active_slave(slave) &&
2865                     (!bond_time_in_interval(bond, trans_start, 2) ||
2866                      !bond_time_in_interval(bond, last_rx, 2))) {
2867                         bond_propose_link_state(slave, BOND_LINK_DOWN);
2868                         commit++;
2869                 }
2870         }
2871
2872         return commit;
2873 }
2874
2875 /* Called to commit link state changes noted by inspection step of
2876  * active-backup mode ARP monitor.
2877  *
2878  * Called with RTNL hold.
2879  */
2880 static void bond_ab_arp_commit(struct bonding *bond)
2881 {
2882         unsigned long trans_start;
2883         struct list_head *iter;
2884         struct slave *slave;
2885
2886         bond_for_each_slave(bond, slave, iter) {
2887                 switch (slave->link_new_state) {
2888                 case BOND_LINK_NOCHANGE:
2889                         continue;
2890
2891                 case BOND_LINK_UP:
2892                         trans_start = dev_trans_start(slave->dev);
2893                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2894                             (!rtnl_dereference(bond->curr_active_slave) &&
2895                              bond_time_in_interval(bond, trans_start, 1))) {
2896                                 struct slave *current_arp_slave;
2897
2898                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2899                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
2900                                                           BOND_SLAVE_NOTIFY_NOW);
2901                                 if (current_arp_slave) {
2902                                         bond_set_slave_inactive_flags(
2903                                                 current_arp_slave,
2904                                                 BOND_SLAVE_NOTIFY_NOW);
2905                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2906                                 }
2907
2908                                 slave_info(bond->dev, slave->dev, "link status definitely up\n");
2909
2910                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2911                                     slave == rtnl_dereference(bond->primary_slave))
2912                                         goto do_failover;
2913
2914                         }
2915
2916                         continue;
2917
2918                 case BOND_LINK_DOWN:
2919                         if (slave->link_failure_count < UINT_MAX)
2920                                 slave->link_failure_count++;
2921
2922                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2923                                                   BOND_SLAVE_NOTIFY_NOW);
2924                         bond_set_slave_inactive_flags(slave,
2925                                                       BOND_SLAVE_NOTIFY_NOW);
2926
2927                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2928
2929                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2930                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2931                                 goto do_failover;
2932                         }
2933
2934                         continue;
2935
2936                 default:
2937                         slave_err(bond->dev, slave->dev,
2938                                   "impossible: link_new_state %d on slave\n",
2939                                   slave->link_new_state);
2940                         continue;
2941                 }
2942
2943 do_failover:
2944                 block_netpoll_tx();
2945                 bond_select_active_slave(bond);
2946                 unblock_netpoll_tx();
2947         }
2948
2949         bond_set_carrier(bond);
2950 }
2951
2952 /* Send ARP probes for active-backup mode ARP monitor.
2953  *
2954  * Called with rcu_read_lock held.
2955  */
2956 static bool bond_ab_arp_probe(struct bonding *bond)
2957 {
2958         struct slave *slave, *before = NULL, *new_slave = NULL,
2959                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2960                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2961         struct list_head *iter;
2962         bool found = false;
2963         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2964
2965         if (curr_arp_slave && curr_active_slave)
2966                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2967                             curr_arp_slave->dev->name,
2968                             curr_active_slave->dev->name);
2969
2970         if (curr_active_slave) {
2971                 bond_arp_send_all(bond, curr_active_slave);
2972                 return should_notify_rtnl;
2973         }
2974
2975         /* if we don't have a curr_active_slave, search for the next available
2976          * backup slave from the current_arp_slave and make it the candidate
2977          * for becoming the curr_active_slave
2978          */
2979
2980         if (!curr_arp_slave) {
2981                 curr_arp_slave = bond_first_slave_rcu(bond);
2982                 if (!curr_arp_slave)
2983                         return should_notify_rtnl;
2984         }
2985
2986         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2987
2988         bond_for_each_slave_rcu(bond, slave, iter) {
2989                 if (!found && !before && bond_slave_is_up(slave))
2990                         before = slave;
2991
2992                 if (found && !new_slave && bond_slave_is_up(slave))
2993                         new_slave = slave;
2994                 /* if the link state is up at this point, we
2995                  * mark it down - this can happen if we have
2996                  * simultaneous link failures and
2997                  * reselect_active_interface doesn't make this
2998                  * one the current slave so it is still marked
2999                  * up when it is actually down
3000                  */
3001                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3002                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3003                                                   BOND_SLAVE_NOTIFY_LATER);
3004                         if (slave->link_failure_count < UINT_MAX)
3005                                 slave->link_failure_count++;
3006
3007                         bond_set_slave_inactive_flags(slave,
3008                                                       BOND_SLAVE_NOTIFY_LATER);
3009
3010                         slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3011                 }
3012                 if (slave == curr_arp_slave)
3013                         found = true;
3014         }
3015
3016         if (!new_slave && before)
3017                 new_slave = before;
3018
3019         if (!new_slave)
3020                 goto check_state;
3021
3022         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3023                                   BOND_SLAVE_NOTIFY_LATER);
3024         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3025         bond_arp_send_all(bond, new_slave);
3026         new_slave->last_link_up = jiffies;
3027         rcu_assign_pointer(bond->current_arp_slave, new_slave);
3028
3029 check_state:
3030         bond_for_each_slave_rcu(bond, slave, iter) {
3031                 if (slave->should_notify || slave->should_notify_link) {
3032                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3033                         break;
3034                 }
3035         }
3036         return should_notify_rtnl;
3037 }
3038
3039 static void bond_activebackup_arp_mon(struct bonding *bond)
3040 {
3041         bool should_notify_peers = false;
3042         bool should_notify_rtnl = false;
3043         int delta_in_ticks;
3044
3045         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3046
3047         if (!bond_has_slaves(bond))
3048                 goto re_arm;
3049
3050         rcu_read_lock();
3051
3052         should_notify_peers = bond_should_notify_peers(bond);
3053
3054         if (bond_ab_arp_inspect(bond)) {
3055                 rcu_read_unlock();
3056
3057                 /* Race avoidance with bond_close flush of workqueue */
3058                 if (!rtnl_trylock()) {
3059                         delta_in_ticks = 1;
3060                         should_notify_peers = false;
3061                         goto re_arm;
3062                 }
3063
3064                 bond_ab_arp_commit(bond);
3065
3066                 rtnl_unlock();
3067                 rcu_read_lock();
3068         }
3069
3070         should_notify_rtnl = bond_ab_arp_probe(bond);
3071         rcu_read_unlock();
3072
3073 re_arm:
3074         if (bond->params.arp_interval)
3075                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3076
3077         if (should_notify_peers || should_notify_rtnl) {
3078                 if (!rtnl_trylock())
3079                         return;
3080
3081                 if (should_notify_peers)
3082                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3083                                                  bond->dev);
3084                 if (should_notify_rtnl) {
3085                         bond_slave_state_notify(bond);
3086                         bond_slave_link_notify(bond);
3087                 }
3088
3089                 rtnl_unlock();
3090         }
3091 }
3092
3093 static void bond_arp_monitor(struct work_struct *work)
3094 {
3095         struct bonding *bond = container_of(work, struct bonding,
3096                                             arp_work.work);
3097
3098         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3099                 bond_activebackup_arp_mon(bond);
3100         else
3101                 bond_loadbalance_arp_mon(bond);
3102 }
3103
3104 /*-------------------------- netdev event handling --------------------------*/
3105
3106 /* Change device name */
3107 static int bond_event_changename(struct bonding *bond)
3108 {
3109         bond_remove_proc_entry(bond);
3110         bond_create_proc_entry(bond);
3111
3112         bond_debug_reregister(bond);
3113
3114         return NOTIFY_DONE;
3115 }
3116
3117 static int bond_master_netdev_event(unsigned long event,
3118                                     struct net_device *bond_dev)
3119 {
3120         struct bonding *event_bond = netdev_priv(bond_dev);
3121
3122         netdev_dbg(bond_dev, "%s called\n", __func__);
3123
3124         switch (event) {
3125         case NETDEV_CHANGENAME:
3126                 return bond_event_changename(event_bond);
3127         case NETDEV_UNREGISTER:
3128                 bond_remove_proc_entry(event_bond);
3129                 break;
3130         case NETDEV_REGISTER:
3131                 bond_create_proc_entry(event_bond);
3132                 break;
3133         default:
3134                 break;
3135         }
3136
3137         return NOTIFY_DONE;
3138 }
3139
3140 static int bond_slave_netdev_event(unsigned long event,
3141                                    struct net_device *slave_dev)
3142 {
3143         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3144         struct bonding *bond;
3145         struct net_device *bond_dev;
3146
3147         /* A netdev event can be generated while enslaving a device
3148          * before netdev_rx_handler_register is called in which case
3149          * slave will be NULL
3150          */
3151         if (!slave) {
3152                 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3153                 return NOTIFY_DONE;
3154         }
3155
3156         bond_dev = slave->bond->dev;
3157         bond = slave->bond;
3158         primary = rtnl_dereference(bond->primary_slave);
3159
3160         slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3161
3162         switch (event) {
3163         case NETDEV_UNREGISTER:
3164                 if (bond_dev->type != ARPHRD_ETHER)
3165                         bond_release_and_destroy(bond_dev, slave_dev);
3166                 else
3167                         __bond_release_one(bond_dev, slave_dev, false, true);
3168                 break;
3169         case NETDEV_UP:
3170         case NETDEV_CHANGE:
3171                 /* For 802.3ad mode only:
3172                  * Getting invalid Speed/Duplex values here will put slave
3173                  * in weird state. Mark it as link-fail if the link was
3174                  * previously up or link-down if it hasn't yet come up, and
3175                  * let link-monitoring (miimon) set it right when correct
3176                  * speeds/duplex are available.
3177                  */
3178                 if (bond_update_speed_duplex(slave) &&
3179                     BOND_MODE(bond) == BOND_MODE_8023AD) {
3180                         if (slave->last_link_up)
3181                                 slave->link = BOND_LINK_FAIL;
3182                         else
3183                                 slave->link = BOND_LINK_DOWN;
3184                 }
3185
3186                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3187                         bond_3ad_adapter_speed_duplex_changed(slave);
3188                 /* Fallthrough */
3189         case NETDEV_DOWN:
3190                 /* Refresh slave-array if applicable!
3191                  * If the setup does not use miimon or arpmon (mode-specific!),
3192                  * then these events will not cause the slave-array to be
3193                  * refreshed. This will cause xmit to use a slave that is not
3194                  * usable. Avoid such situation by refeshing the array at these
3195                  * events. If these (miimon/arpmon) parameters are configured
3196                  * then array gets refreshed twice and that should be fine!
3197                  */
3198                 if (bond_mode_can_use_xmit_hash(bond))
3199                         bond_update_slave_arr(bond, NULL);
3200                 break;
3201         case NETDEV_CHANGEMTU:
3202                 /* TODO: Should slaves be allowed to
3203                  * independently alter their MTU?  For
3204                  * an active-backup bond, slaves need
3205                  * not be the same type of device, so
3206                  * MTUs may vary.  For other modes,
3207                  * slaves arguably should have the
3208                  * same MTUs. To do this, we'd need to
3209                  * take over the slave's change_mtu
3210                  * function for the duration of their
3211                  * servitude.
3212                  */
3213                 break;
3214         case NETDEV_CHANGENAME:
3215                 /* we don't care if we don't have primary set */
3216                 if (!bond_uses_primary(bond) ||
3217                     !bond->params.primary[0])
3218                         break;
3219
3220                 if (slave == primary) {
3221                         /* slave's name changed - he's no longer primary */
3222                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3223                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3224                         /* we have a new primary slave */
3225                         rcu_assign_pointer(bond->primary_slave, slave);
3226                 } else { /* we didn't change primary - exit */
3227                         break;
3228                 }
3229
3230                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3231                             primary ? slave_dev->name : "none");
3232
3233                 block_netpoll_tx();
3234                 bond_select_active_slave(bond);
3235                 unblock_netpoll_tx();
3236                 break;
3237         case NETDEV_FEAT_CHANGE:
3238                 bond_compute_features(bond);
3239                 break;
3240         case NETDEV_RESEND_IGMP:
3241                 /* Propagate to master device */
3242                 call_netdevice_notifiers(event, slave->bond->dev);
3243                 break;
3244         default:
3245                 break;
3246         }
3247
3248         return NOTIFY_DONE;
3249 }
3250
3251 /* bond_netdev_event: handle netdev notifier chain events.
3252  *
3253  * This function receives events for the netdev chain.  The caller (an
3254  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3255  * locks for us to safely manipulate the slave devices (RTNL lock,
3256  * dev_probe_lock).
3257  */
3258 static int bond_netdev_event(struct notifier_block *this,
3259                              unsigned long event, void *ptr)
3260 {
3261         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3262
3263         netdev_dbg(event_dev, "%s received %s\n",
3264                    __func__, netdev_cmd_to_name(event));
3265
3266         if (!(event_dev->priv_flags & IFF_BONDING))
3267                 return NOTIFY_DONE;
3268
3269         if (event_dev->flags & IFF_MASTER) {
3270                 int ret;
3271
3272                 ret = bond_master_netdev_event(event, event_dev);
3273                 if (ret != NOTIFY_DONE)
3274                         return ret;
3275         }
3276
3277         if (event_dev->flags & IFF_SLAVE)
3278                 return bond_slave_netdev_event(event, event_dev);
3279
3280         return NOTIFY_DONE;
3281 }
3282
3283 static struct notifier_block bond_netdev_notifier = {
3284         .notifier_call = bond_netdev_event,
3285 };
3286
3287 /*---------------------------- Hashing Policies -----------------------------*/
3288
3289 /* L2 hash helper */
3290 static inline u32 bond_eth_hash(struct sk_buff *skb)
3291 {
3292         struct ethhdr *ep, hdr_tmp;
3293
3294         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3295         if (ep)
3296                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3297         return 0;
3298 }
3299
3300 /* Extract the appropriate headers based on bond's xmit policy */
3301 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3302                               struct flow_keys *fk)
3303 {
3304         const struct ipv6hdr *iph6;
3305         const struct iphdr *iph;
3306         int noff, proto = -1;
3307
3308         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) {
3309                 memset(fk, 0, sizeof(*fk));
3310                 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
3311                                           fk, NULL, 0, 0, 0, 0);
3312         }
3313
3314         fk->ports.ports = 0;
3315         memset(&fk->icmp, 0, sizeof(fk->icmp));
3316         noff = skb_network_offset(skb);
3317         if (skb->protocol == htons(ETH_P_IP)) {
3318                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3319                         return false;
3320                 iph = ip_hdr(skb);
3321                 iph_to_flow_copy_v4addrs(fk, iph);
3322                 noff += iph->ihl << 2;
3323                 if (!ip_is_fragment(iph))
3324                         proto = iph->protocol;
3325         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3326                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3327                         return false;
3328                 iph6 = ipv6_hdr(skb);
3329                 iph_to_flow_copy_v6addrs(fk, iph6);
3330                 noff += sizeof(*iph6);
3331                 proto = iph6->nexthdr;
3332         } else {
3333                 return false;
3334         }
3335         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0) {
3336                 if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6)
3337                         skb_flow_get_icmp_tci(skb, &fk->icmp, skb->data,
3338                                               skb_transport_offset(skb),
3339                                               skb_headlen(skb));
3340                 else
3341                         fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3342         }
3343
3344         return true;
3345 }
3346
3347 /**
3348  * bond_xmit_hash - generate a hash value based on the xmit policy
3349  * @bond: bonding device
3350  * @skb: buffer to use for headers
3351  *
3352  * This function will extract the necessary headers from the skb buffer and use
3353  * them to generate a hash based on the xmit_policy set in the bonding device
3354  */
3355 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3356 {
3357         struct flow_keys flow;
3358         u32 hash;
3359
3360         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3361             skb->l4_hash)
3362                 return skb->hash;
3363
3364         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3365             !bond_flow_dissect(bond, skb, &flow))
3366                 return bond_eth_hash(skb);
3367
3368         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3369             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
3370                 hash = bond_eth_hash(skb);
3371         } else {
3372                 if (flow.icmp.id)
3373                         memcpy(&hash, &flow.icmp, sizeof(hash));
3374                 else
3375                         memcpy(&hash, &flow.ports.ports, sizeof(hash));
3376         }
3377         hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3378                 (__force u32)flow_get_u32_src(&flow);
3379         hash ^= (hash >> 16);
3380         hash ^= (hash >> 8);
3381
3382         return hash >> 1;
3383 }
3384
3385 /*-------------------------- Device entry points ----------------------------*/
3386
3387 void bond_work_init_all(struct bonding *bond)
3388 {
3389         INIT_DELAYED_WORK(&bond->mcast_work,
3390                           bond_resend_igmp_join_requests_delayed);
3391         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3392         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3393         INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3394         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3395         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3396 }
3397
3398 static void bond_work_cancel_all(struct bonding *bond)
3399 {
3400         cancel_delayed_work_sync(&bond->mii_work);
3401         cancel_delayed_work_sync(&bond->arp_work);
3402         cancel_delayed_work_sync(&bond->alb_work);
3403         cancel_delayed_work_sync(&bond->ad_work);
3404         cancel_delayed_work_sync(&bond->mcast_work);
3405         cancel_delayed_work_sync(&bond->slave_arr_work);
3406 }
3407
3408 static int bond_open(struct net_device *bond_dev)
3409 {
3410         struct bonding *bond = netdev_priv(bond_dev);
3411         struct list_head *iter;
3412         struct slave *slave;
3413
3414         /* reset slave->backup and slave->inactive */
3415         if (bond_has_slaves(bond)) {
3416                 bond_for_each_slave(bond, slave, iter) {
3417                         if (bond_uses_primary(bond) &&
3418                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3419                                 bond_set_slave_inactive_flags(slave,
3420                                                               BOND_SLAVE_NOTIFY_NOW);
3421                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3422                                 bond_set_slave_active_flags(slave,
3423                                                             BOND_SLAVE_NOTIFY_NOW);
3424                         }
3425                 }
3426         }
3427
3428         if (bond_is_lb(bond)) {
3429                 /* bond_alb_initialize must be called before the timer
3430                  * is started.
3431                  */
3432                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3433                         return -ENOMEM;
3434                 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3435                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3436         }
3437
3438         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3439                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3440
3441         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3442                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3443                 bond->recv_probe = bond_arp_rcv;
3444         }
3445
3446         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3447                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3448                 /* register to receive LACPDUs */
3449                 bond->recv_probe = bond_3ad_lacpdu_recv;
3450                 bond_3ad_initiate_agg_selection(bond, 1);
3451         }
3452
3453         if (bond_mode_can_use_xmit_hash(bond))
3454                 bond_update_slave_arr(bond, NULL);
3455
3456         return 0;
3457 }
3458
3459 static int bond_close(struct net_device *bond_dev)
3460 {
3461         struct bonding *bond = netdev_priv(bond_dev);
3462
3463         bond_work_cancel_all(bond);
3464         bond->send_peer_notif = 0;
3465         if (bond_is_lb(bond))
3466                 bond_alb_deinitialize(bond);
3467         bond->recv_probe = NULL;
3468
3469         return 0;
3470 }
3471
3472 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3473  * that some drivers can provide 32bit values only.
3474  */
3475 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3476                             const struct rtnl_link_stats64 *_new,
3477                             const struct rtnl_link_stats64 *_old)
3478 {
3479         const u64 *new = (const u64 *)_new;
3480         const u64 *old = (const u64 *)_old;
3481         u64 *res = (u64 *)_res;
3482         int i;
3483
3484         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3485                 u64 nv = new[i];
3486                 u64 ov = old[i];
3487                 s64 delta = nv - ov;
3488
3489                 /* detects if this particular field is 32bit only */
3490                 if (((nv | ov) >> 32) == 0)
3491                         delta = (s64)(s32)((u32)nv - (u32)ov);
3492
3493                 /* filter anomalies, some drivers reset their stats
3494                  * at down/up events.
3495                  */
3496                 if (delta > 0)
3497                         res[i] += delta;
3498         }
3499 }
3500
3501 static void bond_get_stats(struct net_device *bond_dev,
3502                            struct rtnl_link_stats64 *stats)
3503 {
3504         struct bonding *bond = netdev_priv(bond_dev);
3505         struct rtnl_link_stats64 temp;
3506         struct list_head *iter;
3507         struct slave *slave;
3508
3509         spin_lock(&bond->stats_lock);
3510         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3511
3512         rcu_read_lock();
3513         bond_for_each_slave_rcu(bond, slave, iter) {
3514                 const struct rtnl_link_stats64 *new =
3515                         dev_get_stats(slave->dev, &temp);
3516
3517                 bond_fold_stats(stats, new, &slave->slave_stats);
3518
3519                 /* save off the slave stats for the next run */
3520                 memcpy(&slave->slave_stats, new, sizeof(*new));
3521         }
3522         rcu_read_unlock();
3523
3524         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3525         spin_unlock(&bond->stats_lock);
3526 }
3527
3528 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3529 {
3530         struct bonding *bond = netdev_priv(bond_dev);
3531         struct net_device *slave_dev = NULL;
3532         struct ifbond k_binfo;
3533         struct ifbond __user *u_binfo = NULL;
3534         struct ifslave k_sinfo;
3535         struct ifslave __user *u_sinfo = NULL;
3536         struct mii_ioctl_data *mii = NULL;
3537         struct bond_opt_value newval;
3538         struct net *net;
3539         int res = 0;
3540
3541         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3542
3543         switch (cmd) {
3544         case SIOCGMIIPHY:
3545                 mii = if_mii(ifr);
3546                 if (!mii)
3547                         return -EINVAL;
3548
3549                 mii->phy_id = 0;
3550                 /* Fall Through */
3551         case SIOCGMIIREG:
3552                 /* We do this again just in case we were called by SIOCGMIIREG
3553                  * instead of SIOCGMIIPHY.
3554                  */
3555                 mii = if_mii(ifr);
3556                 if (!mii)
3557                         return -EINVAL;
3558
3559                 if (mii->reg_num == 1) {
3560                         mii->val_out = 0;
3561                         if (netif_carrier_ok(bond->dev))
3562                                 mii->val_out = BMSR_LSTATUS;
3563                 }
3564
3565                 return 0;
3566         case BOND_INFO_QUERY_OLD:
3567         case SIOCBONDINFOQUERY:
3568                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3569
3570                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3571                         return -EFAULT;
3572
3573                 bond_info_query(bond_dev, &k_binfo);
3574                 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3575                         return -EFAULT;
3576
3577                 return 0;
3578         case BOND_SLAVE_INFO_QUERY_OLD:
3579         case SIOCBONDSLAVEINFOQUERY:
3580                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3581
3582                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3583                         return -EFAULT;
3584
3585                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3586                 if (res == 0 &&
3587                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3588                         return -EFAULT;
3589
3590                 return res;
3591         default:
3592                 break;
3593         }
3594
3595         net = dev_net(bond_dev);
3596
3597         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3598                 return -EPERM;
3599
3600         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3601
3602         slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3603
3604         if (!slave_dev)
3605                 return -ENODEV;
3606
3607         switch (cmd) {
3608         case BOND_ENSLAVE_OLD:
3609         case SIOCBONDENSLAVE:
3610                 res = bond_enslave(bond_dev, slave_dev, NULL);
3611                 break;
3612         case BOND_RELEASE_OLD:
3613         case SIOCBONDRELEASE:
3614                 res = bond_release(bond_dev, slave_dev);
3615                 break;
3616         case BOND_SETHWADDR_OLD:
3617         case SIOCBONDSETHWADDR:
3618                 res = bond_set_dev_addr(bond_dev, slave_dev);
3619                 break;
3620         case BOND_CHANGE_ACTIVE_OLD:
3621         case SIOCBONDCHANGEACTIVE:
3622                 bond_opt_initstr(&newval, slave_dev->name);
3623                 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3624                                             &newval);
3625                 break;
3626         default:
3627                 res = -EOPNOTSUPP;
3628         }
3629
3630         return res;
3631 }
3632
3633 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3634 {
3635         struct bonding *bond = netdev_priv(bond_dev);
3636
3637         if (change & IFF_PROMISC)
3638                 bond_set_promiscuity(bond,
3639                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3640
3641         if (change & IFF_ALLMULTI)
3642                 bond_set_allmulti(bond,
3643                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3644 }
3645
3646 static void bond_set_rx_mode(struct net_device *bond_dev)
3647 {
3648         struct bonding *bond = netdev_priv(bond_dev);
3649         struct list_head *iter;
3650         struct slave *slave;
3651
3652         rcu_read_lock();
3653         if (bond_uses_primary(bond)) {
3654                 slave = rcu_dereference(bond->curr_active_slave);
3655                 if (slave) {
3656                         dev_uc_sync(slave->dev, bond_dev);
3657                         dev_mc_sync(slave->dev, bond_dev);
3658                 }
3659         } else {
3660                 bond_for_each_slave_rcu(bond, slave, iter) {
3661                         dev_uc_sync_multiple(slave->dev, bond_dev);
3662                         dev_mc_sync_multiple(slave->dev, bond_dev);
3663                 }
3664         }
3665         rcu_read_unlock();
3666 }
3667
3668 static int bond_neigh_init(struct neighbour *n)
3669 {
3670         struct bonding *bond = netdev_priv(n->dev);
3671         const struct net_device_ops *slave_ops;
3672         struct neigh_parms parms;
3673         struct slave *slave;
3674         int ret;
3675
3676         slave = bond_first_slave(bond);
3677         if (!slave)
3678                 return 0;
3679         slave_ops = slave->dev->netdev_ops;
3680         if (!slave_ops->ndo_neigh_setup)
3681                 return 0;
3682
3683         parms.neigh_setup = NULL;
3684         parms.neigh_cleanup = NULL;
3685         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3686         if (ret)
3687                 return ret;
3688
3689         /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3690          * after the last slave has been detached.  Assumes that all slaves
3691          * utilize the same neigh_cleanup (true at this writing as only user
3692          * is ipoib).
3693          */
3694         n->parms->neigh_cleanup = parms.neigh_cleanup;
3695
3696         if (!parms.neigh_setup)
3697                 return 0;
3698
3699         return parms.neigh_setup(n);
3700 }
3701
3702 /* The bonding ndo_neigh_setup is called at init time beofre any
3703  * slave exists. So we must declare proxy setup function which will
3704  * be used at run time to resolve the actual slave neigh param setup.
3705  *
3706  * It's also called by master devices (such as vlans) to setup their
3707  * underlying devices. In that case - do nothing, we're already set up from
3708  * our init.
3709  */
3710 static int bond_neigh_setup(struct net_device *dev,
3711                             struct neigh_parms *parms)
3712 {
3713         /* modify only our neigh_parms */
3714         if (parms->dev == dev)
3715                 parms->neigh_setup = bond_neigh_init;
3716
3717         return 0;
3718 }
3719
3720 /* Change the MTU of all of a master's slaves to match the master */
3721 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3722 {
3723         struct bonding *bond = netdev_priv(bond_dev);
3724         struct slave *slave, *rollback_slave;
3725         struct list_head *iter;
3726         int res = 0;
3727
3728         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3729
3730         bond_for_each_slave(bond, slave, iter) {
3731                 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
3732                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3733
3734                 res = dev_set_mtu(slave->dev, new_mtu);
3735
3736                 if (res) {
3737                         /* If we failed to set the slave's mtu to the new value
3738                          * we must abort the operation even in ACTIVE_BACKUP
3739                          * mode, because if we allow the backup slaves to have
3740                          * different mtu values than the active slave we'll
3741                          * need to change their mtu when doing a failover. That
3742                          * means changing their mtu from timer context, which
3743                          * is probably not a good idea.
3744                          */
3745                         slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
3746                                   res, new_mtu);
3747                         goto unwind;
3748                 }
3749         }
3750
3751         bond_dev->mtu = new_mtu;
3752
3753         return 0;
3754
3755 unwind:
3756         /* unwind from head to the slave that failed */
3757         bond_for_each_slave(bond, rollback_slave, iter) {
3758                 int tmp_res;
3759
3760                 if (rollback_slave == slave)
3761                         break;
3762
3763                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3764                 if (tmp_res)
3765                         slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
3766                                   tmp_res);
3767         }
3768
3769         return res;
3770 }
3771
3772 /* Change HW address
3773  *
3774  * Note that many devices must be down to change the HW address, and
3775  * downing the master releases all slaves.  We can make bonds full of
3776  * bonding devices to test this, however.
3777  */
3778 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3779 {
3780         struct bonding *bond = netdev_priv(bond_dev);
3781         struct slave *slave, *rollback_slave;
3782         struct sockaddr_storage *ss = addr, tmp_ss;
3783         struct list_head *iter;
3784         int res = 0;
3785
3786         if (BOND_MODE(bond) == BOND_MODE_ALB)
3787                 return bond_alb_set_mac_address(bond_dev, addr);
3788
3789
3790         netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
3791
3792         /* If fail_over_mac is enabled, do nothing and return success.
3793          * Returning an error causes ifenslave to fail.
3794          */
3795         if (bond->params.fail_over_mac &&
3796             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3797                 return 0;
3798
3799         if (!is_valid_ether_addr(ss->__data))
3800                 return -EADDRNOTAVAIL;
3801
3802         bond_for_each_slave(bond, slave, iter) {
3803                 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
3804                           __func__, slave);
3805                 res = dev_set_mac_address(slave->dev, addr, NULL);
3806                 if (res) {
3807                         /* TODO: consider downing the slave
3808                          * and retry ?
3809                          * User should expect communications
3810                          * breakage anyway until ARP finish
3811                          * updating, so...
3812                          */
3813                         slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
3814                                   __func__, res);
3815                         goto unwind;
3816                 }
3817         }
3818
3819         /* success */
3820         memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
3821         return 0;
3822
3823 unwind:
3824         memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
3825         tmp_ss.ss_family = bond_dev->type;
3826
3827         /* unwind from head to the slave that failed */
3828         bond_for_each_slave(bond, rollback_slave, iter) {
3829                 int tmp_res;
3830
3831                 if (rollback_slave == slave)
3832                         break;
3833
3834                 tmp_res = dev_set_mac_address(rollback_slave->dev,
3835                                               (struct sockaddr *)&tmp_ss, NULL);
3836                 if (tmp_res) {
3837                         slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
3838                                    __func__, tmp_res);
3839                 }
3840         }
3841
3842         return res;
3843 }
3844
3845 /**
3846  * bond_xmit_slave_id - transmit skb through slave with slave_id
3847  * @bond: bonding device that is transmitting
3848  * @skb: buffer to transmit
3849  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3850  *
3851  * This function tries to transmit through slave with slave_id but in case
3852  * it fails, it tries to find the first available slave for transmission.
3853  * The skb is consumed in all cases, thus the function is void.
3854  */
3855 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3856 {
3857         struct list_head *iter;
3858         struct slave *slave;
3859         int i = slave_id;
3860
3861         /* Here we start from the slave with slave_id */
3862         bond_for_each_slave_rcu(bond, slave, iter) {
3863                 if (--i < 0) {
3864                         if (bond_slave_can_tx(slave)) {
3865                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3866                                 return;
3867                         }
3868                 }
3869         }
3870
3871         /* Here we start from the first slave up to slave_id */
3872         i = slave_id;
3873         bond_for_each_slave_rcu(bond, slave, iter) {
3874                 if (--i < 0)
3875                         break;
3876                 if (bond_slave_can_tx(slave)) {
3877                         bond_dev_queue_xmit(bond, skb, slave->dev);
3878                         return;
3879                 }
3880         }
3881         /* no slave that can tx has been found */
3882         bond_tx_drop(bond->dev, skb);
3883 }
3884
3885 /**
3886  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3887  * @bond: bonding device to use
3888  *
3889  * Based on the value of the bonding device's packets_per_slave parameter
3890  * this function generates a slave id, which is usually used as the next
3891  * slave to transmit through.
3892  */
3893 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3894 {
3895         u32 slave_id;
3896         struct reciprocal_value reciprocal_packets_per_slave;
3897         int packets_per_slave = bond->params.packets_per_slave;
3898
3899         switch (packets_per_slave) {
3900         case 0:
3901                 slave_id = prandom_u32();
3902                 break;
3903         case 1:
3904                 slave_id = bond->rr_tx_counter;
3905                 break;
3906         default:
3907                 reciprocal_packets_per_slave =
3908                         bond->params.reciprocal_packets_per_slave;
3909                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3910                                              reciprocal_packets_per_slave);
3911                 break;
3912         }
3913         bond->rr_tx_counter++;
3914
3915         return slave_id;
3916 }
3917
3918 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
3919                                         struct net_device *bond_dev)
3920 {
3921         struct bonding *bond = netdev_priv(bond_dev);
3922         struct slave *slave;
3923         int slave_cnt;
3924         u32 slave_id;
3925
3926         /* Start with the curr_active_slave that joined the bond as the
3927          * default for sending IGMP traffic.  For failover purposes one
3928          * needs to maintain some consistency for the interface that will
3929          * send the join/membership reports.  The curr_active_slave found
3930          * will send all of this type of traffic.
3931          */
3932         if (skb->protocol == htons(ETH_P_IP)) {
3933                 int noff = skb_network_offset(skb);
3934                 struct iphdr *iph;
3935
3936                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3937                         goto non_igmp;
3938
3939                 iph = ip_hdr(skb);
3940                 if (iph->protocol == IPPROTO_IGMP) {
3941                         slave = rcu_dereference(bond->curr_active_slave);
3942                         if (slave)
3943                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3944                         else
3945                                 bond_xmit_slave_id(bond, skb, 0);
3946                         return NETDEV_TX_OK;
3947                 }
3948         }
3949
3950 non_igmp:
3951         slave_cnt = READ_ONCE(bond->slave_cnt);
3952         if (likely(slave_cnt)) {
3953                 slave_id = bond_rr_gen_slave_id(bond);
3954                 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3955         } else {
3956                 bond_tx_drop(bond_dev, skb);
3957         }
3958         return NETDEV_TX_OK;
3959 }
3960
3961 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3962  * the bond has a usable interface.
3963  */
3964 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
3965                                           struct net_device *bond_dev)
3966 {
3967         struct bonding *bond = netdev_priv(bond_dev);
3968         struct slave *slave;
3969
3970         slave = rcu_dereference(bond->curr_active_slave);
3971         if (slave)
3972                 bond_dev_queue_xmit(bond, skb, slave->dev);
3973         else
3974                 bond_tx_drop(bond_dev, skb);
3975
3976         return NETDEV_TX_OK;
3977 }
3978
3979 /* Use this to update slave_array when (a) it's not appropriate to update
3980  * slave_array right away (note that update_slave_array() may sleep)
3981  * and / or (b) RTNL is not held.
3982  */
3983 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3984 {
3985         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3986 }
3987
3988 /* Slave array work handler. Holds only RTNL */
3989 static void bond_slave_arr_handler(struct work_struct *work)
3990 {
3991         struct bonding *bond = container_of(work, struct bonding,
3992                                             slave_arr_work.work);
3993         int ret;
3994
3995         if (!rtnl_trylock())
3996                 goto err;
3997
3998         ret = bond_update_slave_arr(bond, NULL);
3999         rtnl_unlock();
4000         if (ret) {
4001                 pr_warn_ratelimited("Failed to update slave array from WT\n");
4002                 goto err;
4003         }
4004         return;
4005
4006 err:
4007         bond_slave_arr_work_rearm(bond, 1);
4008 }
4009
4010 /* Build the usable slaves array in control path for modes that use xmit-hash
4011  * to determine the slave interface -
4012  * (a) BOND_MODE_8023AD
4013  * (b) BOND_MODE_XOR
4014  * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
4015  *
4016  * The caller is expected to hold RTNL only and NO other lock!
4017  */
4018 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
4019 {
4020         struct slave *slave;
4021         struct list_head *iter;
4022         struct bond_up_slave *new_arr, *old_arr;
4023         int agg_id = 0;
4024         int ret = 0;
4025
4026 #ifdef CONFIG_LOCKDEP
4027         WARN_ON(lockdep_is_held(&bond->mode_lock));
4028 #endif
4029
4030         new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
4031                           GFP_KERNEL);
4032         if (!new_arr) {
4033                 ret = -ENOMEM;
4034                 pr_err("Failed to build slave-array.\n");
4035                 goto out;
4036         }
4037         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4038                 struct ad_info ad_info;
4039
4040                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
4041                         pr_debug("bond_3ad_get_active_agg_info failed\n");
4042                         kfree_rcu(new_arr, rcu);
4043                         /* No active aggragator means it's not safe to use
4044                          * the previous array.
4045                          */
4046                         old_arr = rtnl_dereference(bond->slave_arr);
4047                         if (old_arr) {
4048                                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4049                                 kfree_rcu(old_arr, rcu);
4050                         }
4051                         goto out;
4052                 }
4053                 agg_id = ad_info.aggregator_id;
4054         }
4055         bond_for_each_slave(bond, slave, iter) {
4056                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4057                         struct aggregator *agg;
4058
4059                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
4060                         if (!agg || agg->aggregator_identifier != agg_id)
4061                                 continue;
4062                 }
4063                 if (!bond_slave_can_tx(slave))
4064                         continue;
4065                 if (skipslave == slave)
4066                         continue;
4067
4068                 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4069                           new_arr->count);
4070
4071                 new_arr->arr[new_arr->count++] = slave;
4072         }
4073
4074         old_arr = rtnl_dereference(bond->slave_arr);
4075         rcu_assign_pointer(bond->slave_arr, new_arr);
4076         if (old_arr)
4077                 kfree_rcu(old_arr, rcu);
4078 out:
4079         if (ret != 0 && skipslave) {
4080                 int idx;
4081
4082                 /* Rare situation where caller has asked to skip a specific
4083                  * slave but allocation failed (most likely!). BTW this is
4084                  * only possible when the call is initiated from
4085                  * __bond_release_one(). In this situation; overwrite the
4086                  * skipslave entry in the array with the last entry from the
4087                  * array to avoid a situation where the xmit path may choose
4088                  * this to-be-skipped slave to send a packet out.
4089                  */
4090                 old_arr = rtnl_dereference(bond->slave_arr);
4091                 for (idx = 0; old_arr != NULL && idx < old_arr->count; idx++) {
4092                         if (skipslave == old_arr->arr[idx]) {
4093                                 old_arr->arr[idx] =
4094                                     old_arr->arr[old_arr->count-1];
4095                                 old_arr->count--;
4096                                 break;
4097                         }
4098                 }
4099         }
4100         return ret;
4101 }
4102
4103 /* Use this Xmit function for 3AD as well as XOR modes. The current
4104  * usable slave array is formed in the control path. The xmit function
4105  * just calculates hash and sends the packet out.
4106  */
4107 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4108                                      struct net_device *dev)
4109 {
4110         struct bonding *bond = netdev_priv(dev);
4111         struct slave *slave;
4112         struct bond_up_slave *slaves;
4113         unsigned int count;
4114
4115         slaves = rcu_dereference(bond->slave_arr);
4116         count = slaves ? READ_ONCE(slaves->count) : 0;
4117         if (likely(count)) {
4118                 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
4119                 bond_dev_queue_xmit(bond, skb, slave->dev);
4120         } else {
4121                 bond_tx_drop(dev, skb);
4122         }
4123
4124         return NETDEV_TX_OK;
4125 }
4126
4127 /* in broadcast mode, we send everything to all usable interfaces. */
4128 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4129                                        struct net_device *bond_dev)
4130 {
4131         struct bonding *bond = netdev_priv(bond_dev);
4132         struct slave *slave = NULL;
4133         struct list_head *iter;
4134
4135         bond_for_each_slave_rcu(bond, slave, iter) {
4136                 if (bond_is_last_slave(bond, slave))
4137                         break;
4138                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4139                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4140
4141                         if (!skb2) {
4142                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4143                                                     bond_dev->name, __func__);
4144                                 continue;
4145                         }
4146                         bond_dev_queue_xmit(bond, skb2, slave->dev);
4147                 }
4148         }
4149         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4150                 bond_dev_queue_xmit(bond, skb, slave->dev);
4151         else
4152                 bond_tx_drop(bond_dev, skb);
4153
4154         return NETDEV_TX_OK;
4155 }
4156
4157 /*------------------------- Device initialization ---------------------------*/
4158
4159 /* Lookup the slave that corresponds to a qid */
4160 static inline int bond_slave_override(struct bonding *bond,
4161                                       struct sk_buff *skb)
4162 {
4163         struct slave *slave = NULL;
4164         struct list_head *iter;
4165
4166         if (!skb_rx_queue_recorded(skb))
4167                 return 1;
4168
4169         /* Find out if any slaves have the same mapping as this skb. */
4170         bond_for_each_slave_rcu(bond, slave, iter) {
4171                 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4172                         if (bond_slave_is_up(slave) &&
4173                             slave->link == BOND_LINK_UP) {
4174                                 bond_dev_queue_xmit(bond, skb, slave->dev);
4175                                 return 0;
4176                         }
4177                         /* If the slave isn't UP, use default transmit policy. */
4178                         break;
4179                 }
4180         }
4181
4182         return 1;
4183 }
4184
4185
4186 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4187                              struct net_device *sb_dev)
4188 {
4189         /* This helper function exists to help dev_pick_tx get the correct
4190          * destination queue.  Using a helper function skips a call to
4191          * skb_tx_hash and will put the skbs in the queue we expect on their
4192          * way down to the bonding driver.
4193          */
4194         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4195
4196         /* Save the original txq to restore before passing to the driver */
4197         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4198
4199         if (unlikely(txq >= dev->real_num_tx_queues)) {
4200                 do {
4201                         txq -= dev->real_num_tx_queues;
4202                 } while (txq >= dev->real_num_tx_queues);
4203         }
4204         return txq;
4205 }
4206
4207 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4208 {
4209         struct bonding *bond = netdev_priv(dev);
4210
4211         if (bond_should_override_tx_queue(bond) &&
4212             !bond_slave_override(bond, skb))
4213                 return NETDEV_TX_OK;
4214
4215         switch (BOND_MODE(bond)) {
4216         case BOND_MODE_ROUNDROBIN:
4217                 return bond_xmit_roundrobin(skb, dev);
4218         case BOND_MODE_ACTIVEBACKUP:
4219                 return bond_xmit_activebackup(skb, dev);
4220         case BOND_MODE_8023AD:
4221         case BOND_MODE_XOR:
4222                 return bond_3ad_xor_xmit(skb, dev);
4223         case BOND_MODE_BROADCAST:
4224                 return bond_xmit_broadcast(skb, dev);
4225         case BOND_MODE_ALB:
4226                 return bond_alb_xmit(skb, dev);
4227         case BOND_MODE_TLB:
4228                 return bond_tlb_xmit(skb, dev);
4229         default:
4230                 /* Should never happen, mode already checked */
4231                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4232                 WARN_ON_ONCE(1);
4233                 bond_tx_drop(dev, skb);
4234                 return NETDEV_TX_OK;
4235         }
4236 }
4237
4238 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4239 {
4240         struct bonding *bond = netdev_priv(dev);
4241         netdev_tx_t ret = NETDEV_TX_OK;
4242
4243         /* If we risk deadlock from transmitting this in the
4244          * netpoll path, tell netpoll to queue the frame for later tx
4245          */
4246         if (unlikely(is_netpoll_tx_blocked(dev)))
4247                 return NETDEV_TX_BUSY;
4248
4249         rcu_read_lock();
4250         if (bond_has_slaves(bond))
4251                 ret = __bond_start_xmit(skb, dev);
4252         else
4253                 bond_tx_drop(dev, skb);
4254         rcu_read_unlock();
4255
4256         return ret;
4257 }
4258
4259 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4260                                            struct ethtool_link_ksettings *cmd)
4261 {
4262         struct bonding *bond = netdev_priv(bond_dev);
4263         unsigned long speed = 0;
4264         struct list_head *iter;
4265         struct slave *slave;
4266
4267         cmd->base.duplex = DUPLEX_UNKNOWN;
4268         cmd->base.port = PORT_OTHER;
4269
4270         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4271          * do not need to check mode.  Though link speed might not represent
4272          * the true receive or transmit bandwidth (not all modes are symmetric)
4273          * this is an accurate maximum.
4274          */
4275         bond_for_each_slave(bond, slave, iter) {
4276                 if (bond_slave_can_tx(slave)) {
4277                         if (slave->speed != SPEED_UNKNOWN)
4278                                 speed += slave->speed;
4279                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4280                             slave->duplex != DUPLEX_UNKNOWN)
4281                                 cmd->base.duplex = slave->duplex;
4282                 }
4283         }
4284         cmd->base.speed = speed ? : SPEED_UNKNOWN;
4285
4286         return 0;
4287 }
4288
4289 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4290                                      struct ethtool_drvinfo *drvinfo)
4291 {
4292         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4293         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4294         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4295                  BOND_ABI_VERSION);
4296 }
4297
4298 static const struct ethtool_ops bond_ethtool_ops = {
4299         .get_drvinfo            = bond_ethtool_get_drvinfo,
4300         .get_link               = ethtool_op_get_link,
4301         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4302 };
4303
4304 static const struct net_device_ops bond_netdev_ops = {
4305         .ndo_init               = bond_init,
4306         .ndo_uninit             = bond_uninit,
4307         .ndo_open               = bond_open,
4308         .ndo_stop               = bond_close,
4309         .ndo_start_xmit         = bond_start_xmit,
4310         .ndo_select_queue       = bond_select_queue,
4311         .ndo_get_stats64        = bond_get_stats,
4312         .ndo_do_ioctl           = bond_do_ioctl,
4313         .ndo_change_rx_flags    = bond_change_rx_flags,
4314         .ndo_set_rx_mode        = bond_set_rx_mode,
4315         .ndo_change_mtu         = bond_change_mtu,
4316         .ndo_set_mac_address    = bond_set_mac_address,
4317         .ndo_neigh_setup        = bond_neigh_setup,
4318         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4319         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4320 #ifdef CONFIG_NET_POLL_CONTROLLER
4321         .ndo_netpoll_setup      = bond_netpoll_setup,
4322         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4323         .ndo_poll_controller    = bond_poll_controller,
4324 #endif
4325         .ndo_add_slave          = bond_enslave,
4326         .ndo_del_slave          = bond_release,
4327         .ndo_fix_features       = bond_fix_features,
4328         .ndo_features_check     = passthru_features_check,
4329 };
4330
4331 static const struct device_type bond_type = {
4332         .name = "bond",
4333 };
4334
4335 static void bond_destructor(struct net_device *bond_dev)
4336 {
4337         struct bonding *bond = netdev_priv(bond_dev);
4338         if (bond->wq)
4339                 destroy_workqueue(bond->wq);
4340 }
4341
4342 void bond_setup(struct net_device *bond_dev)
4343 {
4344         struct bonding *bond = netdev_priv(bond_dev);
4345
4346         spin_lock_init(&bond->mode_lock);
4347         bond->params = bonding_defaults;
4348
4349         /* Initialize pointers */
4350         bond->dev = bond_dev;
4351
4352         /* Initialize the device entry points */
4353         ether_setup(bond_dev);
4354         bond_dev->max_mtu = ETH_MAX_MTU;
4355         bond_dev->netdev_ops = &bond_netdev_ops;
4356         bond_dev->ethtool_ops = &bond_ethtool_ops;
4357
4358         bond_dev->needs_free_netdev = true;
4359         bond_dev->priv_destructor = bond_destructor;
4360
4361         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4362
4363         /* Initialize the device options */
4364         bond_dev->flags |= IFF_MASTER;
4365         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4366         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4367
4368         /* don't acquire bond device's netif_tx_lock when transmitting */
4369         bond_dev->features |= NETIF_F_LLTX;
4370
4371         /* By default, we declare the bond to be fully
4372          * VLAN hardware accelerated capable. Special
4373          * care is taken in the various xmit functions
4374          * when there are slaves that are not hw accel
4375          * capable
4376          */
4377
4378         /* Don't allow bond devices to change network namespaces. */
4379         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4380
4381         bond_dev->hw_features = BOND_VLAN_FEATURES |
4382                                 NETIF_F_HW_VLAN_CTAG_RX |
4383                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4384
4385         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4;
4386         bond_dev->features |= bond_dev->hw_features;
4387         bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4388 }
4389
4390 /* Destroy a bonding device.
4391  * Must be under rtnl_lock when this function is called.
4392  */
4393 static void bond_uninit(struct net_device *bond_dev)
4394 {
4395         struct bonding *bond = netdev_priv(bond_dev);
4396         struct list_head *iter;
4397         struct slave *slave;
4398         struct bond_up_slave *arr;
4399
4400         bond_netpoll_cleanup(bond_dev);
4401
4402         /* Release the bonded slaves */
4403         bond_for_each_slave(bond, slave, iter)
4404                 __bond_release_one(bond_dev, slave->dev, true, true);
4405         netdev_info(bond_dev, "Released all slaves\n");
4406
4407         arr = rtnl_dereference(bond->slave_arr);
4408         if (arr) {
4409                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4410                 kfree_rcu(arr, rcu);
4411         }
4412
4413         list_del(&bond->bond_list);
4414
4415         lockdep_unregister_key(&bond->stats_lock_key);
4416         bond_debug_unregister(bond);
4417 }
4418
4419 /*------------------------- Module initialization ---------------------------*/
4420
4421 static int bond_check_params(struct bond_params *params)
4422 {
4423         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4424         struct bond_opt_value newval;
4425         const struct bond_opt_value *valptr;
4426         int arp_all_targets_value = 0;
4427         u16 ad_actor_sys_prio = 0;
4428         u16 ad_user_port_key = 0;
4429         __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4430         int arp_ip_count;
4431         int bond_mode   = BOND_MODE_ROUNDROBIN;
4432         int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4433         int lacp_fast = 0;
4434         int tlb_dynamic_lb;
4435
4436         /* Convert string parameters. */
4437         if (mode) {
4438                 bond_opt_initstr(&newval, mode);
4439                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4440                 if (!valptr) {
4441                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4442                         return -EINVAL;
4443                 }
4444                 bond_mode = valptr->value;
4445         }
4446
4447         if (xmit_hash_policy) {
4448                 if (bond_mode == BOND_MODE_ROUNDROBIN ||
4449                     bond_mode == BOND_MODE_ACTIVEBACKUP ||
4450                     bond_mode == BOND_MODE_BROADCAST) {
4451                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4452                                 bond_mode_name(bond_mode));
4453                 } else {
4454                         bond_opt_initstr(&newval, xmit_hash_policy);
4455                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4456                                                 &newval);
4457                         if (!valptr) {
4458                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4459                                        xmit_hash_policy);
4460                                 return -EINVAL;
4461                         }
4462                         xmit_hashtype = valptr->value;
4463                 }
4464         }
4465
4466         if (lacp_rate) {
4467                 if (bond_mode != BOND_MODE_8023AD) {
4468                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4469                                 bond_mode_name(bond_mode));
4470                 } else {
4471                         bond_opt_initstr(&newval, lacp_rate);
4472                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4473                                                 &newval);
4474                         if (!valptr) {
4475                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4476                                        lacp_rate);
4477                                 return -EINVAL;
4478                         }
4479                         lacp_fast = valptr->value;
4480                 }
4481         }
4482
4483         if (ad_select) {
4484                 bond_opt_initstr(&newval, ad_select);
4485                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4486                                         &newval);
4487                 if (!valptr) {
4488                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4489                         return -EINVAL;
4490                 }
4491                 params->ad_select = valptr->value;
4492                 if (bond_mode != BOND_MODE_8023AD)
4493                         pr_warn("ad_select param only affects 802.3ad mode\n");
4494         } else {
4495                 params->ad_select = BOND_AD_STABLE;
4496         }
4497
4498         if (max_bonds < 0) {
4499                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4500                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4501                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4502         }
4503
4504         if (miimon < 0) {
4505                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4506                         miimon, INT_MAX);
4507                 miimon = 0;
4508         }
4509
4510         if (updelay < 0) {
4511                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4512                         updelay, INT_MAX);
4513                 updelay = 0;
4514         }
4515
4516         if (downdelay < 0) {
4517                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4518                         downdelay, INT_MAX);
4519                 downdelay = 0;
4520         }
4521
4522         if ((use_carrier != 0) && (use_carrier != 1)) {
4523                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4524                         use_carrier);
4525                 use_carrier = 1;
4526         }
4527
4528         if (num_peer_notif < 0 || num_peer_notif > 255) {
4529                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4530                         num_peer_notif);
4531                 num_peer_notif = 1;
4532         }
4533
4534         /* reset values for 802.3ad/TLB/ALB */
4535         if (!bond_mode_uses_arp(bond_mode)) {
4536                 if (!miimon) {
4537                         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");
4538                         pr_warn("Forcing miimon to 100msec\n");
4539                         miimon = BOND_DEFAULT_MIIMON;
4540                 }
4541         }
4542
4543         if (tx_queues < 1 || tx_queues > 255) {
4544                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4545                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4546                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4547         }
4548
4549         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4550                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4551                         all_slaves_active);
4552                 all_slaves_active = 0;
4553         }
4554
4555         if (resend_igmp < 0 || resend_igmp > 255) {
4556                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4557                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4558                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4559         }
4560
4561         bond_opt_initval(&newval, packets_per_slave);
4562         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4563                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4564                         packets_per_slave, USHRT_MAX);
4565                 packets_per_slave = 1;
4566         }
4567
4568         if (bond_mode == BOND_MODE_ALB) {
4569                 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",
4570                           updelay);
4571         }
4572
4573         if (!miimon) {
4574                 if (updelay || downdelay) {
4575                         /* just warn the user the up/down delay will have
4576                          * no effect since miimon is zero...
4577                          */
4578                         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",
4579                                 updelay, downdelay);
4580                 }
4581         } else {
4582                 /* don't allow arp monitoring */
4583                 if (arp_interval) {
4584                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4585                                 miimon, arp_interval);
4586                         arp_interval = 0;
4587                 }
4588
4589                 if ((updelay % miimon) != 0) {
4590                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4591                                 updelay, miimon, (updelay / miimon) * miimon);
4592                 }
4593
4594                 updelay /= miimon;
4595
4596                 if ((downdelay % miimon) != 0) {
4597                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4598                                 downdelay, miimon,
4599                                 (downdelay / miimon) * miimon);
4600                 }
4601
4602                 downdelay /= miimon;
4603         }
4604
4605         if (arp_interval < 0) {
4606                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4607                         arp_interval, INT_MAX);
4608                 arp_interval = 0;
4609         }
4610
4611         for (arp_ip_count = 0, i = 0;
4612              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4613                 __be32 ip;
4614
4615                 /* not a complete check, but good enough to catch mistakes */
4616                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4617                     !bond_is_ip_target_ok(ip)) {
4618                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4619                                 arp_ip_target[i]);
4620                         arp_interval = 0;
4621                 } else {
4622                         if (bond_get_targets_ip(arp_target, ip) == -1)
4623                                 arp_target[arp_ip_count++] = ip;
4624                         else
4625                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4626                                         &ip);
4627                 }
4628         }
4629
4630         if (arp_interval && !arp_ip_count) {
4631                 /* don't allow arping if no arp_ip_target given... */
4632                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4633                         arp_interval);
4634                 arp_interval = 0;
4635         }
4636
4637         if (arp_validate) {
4638                 if (!arp_interval) {
4639                         pr_err("arp_validate requires arp_interval\n");
4640                         return -EINVAL;
4641                 }
4642
4643                 bond_opt_initstr(&newval, arp_validate);
4644                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4645                                         &newval);
4646                 if (!valptr) {
4647                         pr_err("Error: invalid arp_validate \"%s\"\n",
4648                                arp_validate);
4649                         return -EINVAL;
4650                 }
4651                 arp_validate_value = valptr->value;
4652         } else {
4653                 arp_validate_value = 0;
4654         }
4655
4656         if (arp_all_targets) {
4657                 bond_opt_initstr(&newval, arp_all_targets);
4658                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4659                                         &newval);
4660                 if (!valptr) {
4661                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4662                                arp_all_targets);
4663                         arp_all_targets_value = 0;
4664                 } else {
4665                         arp_all_targets_value = valptr->value;
4666                 }
4667         }
4668
4669         if (miimon) {
4670                 pr_info("MII link monitoring set to %d ms\n", miimon);
4671         } else if (arp_interval) {
4672                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4673                                           arp_validate_value);
4674                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4675                         arp_interval, valptr->string, arp_ip_count);
4676
4677                 for (i = 0; i < arp_ip_count; i++)
4678                         pr_cont(" %s", arp_ip_target[i]);
4679
4680                 pr_cont("\n");
4681
4682         } else if (max_bonds) {
4683                 /* miimon and arp_interval not set, we need one so things
4684                  * work as expected, see bonding.txt for details
4685                  */
4686                 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");
4687         }
4688
4689         if (primary && !bond_mode_uses_primary(bond_mode)) {
4690                 /* currently, using a primary only makes sense
4691                  * in active backup, TLB or ALB modes
4692                  */
4693                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4694                         primary, bond_mode_name(bond_mode));
4695                 primary = NULL;
4696         }
4697
4698         if (primary && primary_reselect) {
4699                 bond_opt_initstr(&newval, primary_reselect);
4700                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4701                                         &newval);
4702                 if (!valptr) {
4703                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4704                                primary_reselect);
4705                         return -EINVAL;
4706                 }
4707                 primary_reselect_value = valptr->value;
4708         } else {
4709                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4710         }
4711
4712         if (fail_over_mac) {
4713                 bond_opt_initstr(&newval, fail_over_mac);
4714                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4715                                         &newval);
4716                 if (!valptr) {
4717                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4718                                fail_over_mac);
4719                         return -EINVAL;
4720                 }
4721                 fail_over_mac_value = valptr->value;
4722                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4723                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4724         } else {
4725                 fail_over_mac_value = BOND_FOM_NONE;
4726         }
4727
4728         bond_opt_initstr(&newval, "default");
4729         valptr = bond_opt_parse(
4730                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4731                                      &newval);
4732         if (!valptr) {
4733                 pr_err("Error: No ad_actor_sys_prio default value");
4734                 return -EINVAL;
4735         }
4736         ad_actor_sys_prio = valptr->value;
4737
4738         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4739                                 &newval);
4740         if (!valptr) {
4741                 pr_err("Error: No ad_user_port_key default value");
4742                 return -EINVAL;
4743         }
4744         ad_user_port_key = valptr->value;
4745
4746         bond_opt_initstr(&newval, "default");
4747         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
4748         if (!valptr) {
4749                 pr_err("Error: No tlb_dynamic_lb default value");
4750                 return -EINVAL;
4751         }
4752         tlb_dynamic_lb = valptr->value;
4753
4754         if (lp_interval == 0) {
4755                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4756                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4757                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4758         }
4759
4760         /* fill params struct with the proper values */
4761         params->mode = bond_mode;
4762         params->xmit_policy = xmit_hashtype;
4763         params->miimon = miimon;
4764         params->num_peer_notif = num_peer_notif;
4765         params->arp_interval = arp_interval;
4766         params->arp_validate = arp_validate_value;
4767         params->arp_all_targets = arp_all_targets_value;
4768         params->updelay = updelay;
4769         params->downdelay = downdelay;
4770         params->peer_notif_delay = 0;
4771         params->use_carrier = use_carrier;
4772         params->lacp_fast = lacp_fast;
4773         params->primary[0] = 0;
4774         params->primary_reselect = primary_reselect_value;
4775         params->fail_over_mac = fail_over_mac_value;
4776         params->tx_queues = tx_queues;
4777         params->all_slaves_active = all_slaves_active;
4778         params->resend_igmp = resend_igmp;
4779         params->min_links = min_links;
4780         params->lp_interval = lp_interval;
4781         params->packets_per_slave = packets_per_slave;
4782         params->tlb_dynamic_lb = tlb_dynamic_lb;
4783         params->ad_actor_sys_prio = ad_actor_sys_prio;
4784         eth_zero_addr(params->ad_actor_system);
4785         params->ad_user_port_key = ad_user_port_key;
4786         if (packets_per_slave > 0) {
4787                 params->reciprocal_packets_per_slave =
4788                         reciprocal_value(packets_per_slave);
4789         } else {
4790                 /* reciprocal_packets_per_slave is unused if
4791                  * packets_per_slave is 0 or 1, just initialize it
4792                  */
4793                 params->reciprocal_packets_per_slave =
4794                         (struct reciprocal_value) { 0 };
4795         }
4796
4797         if (primary) {
4798                 strncpy(params->primary, primary, IFNAMSIZ);
4799                 params->primary[IFNAMSIZ - 1] = 0;
4800         }
4801
4802         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4803
4804         return 0;
4805 }
4806
4807 /* Called from registration process */
4808 static int bond_init(struct net_device *bond_dev)
4809 {
4810         struct bonding *bond = netdev_priv(bond_dev);
4811         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4812
4813         netdev_dbg(bond_dev, "Begin bond_init\n");
4814
4815         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4816         if (!bond->wq)
4817                 return -ENOMEM;
4818
4819         spin_lock_init(&bond->stats_lock);
4820         lockdep_register_key(&bond->stats_lock_key);
4821         lockdep_set_class(&bond->stats_lock, &bond->stats_lock_key);
4822
4823         list_add_tail(&bond->bond_list, &bn->dev_list);
4824
4825         bond_prepare_sysfs_group(bond);
4826
4827         bond_debug_register(bond);
4828
4829         /* Ensure valid dev_addr */
4830         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4831             bond_dev->addr_assign_type == NET_ADDR_PERM)
4832                 eth_hw_addr_random(bond_dev);
4833
4834         return 0;
4835 }
4836
4837 unsigned int bond_get_num_tx_queues(void)
4838 {
4839         return tx_queues;
4840 }
4841
4842 /* Create a new bond based on the specified name and bonding parameters.
4843  * If name is NULL, obtain a suitable "bond%d" name for us.
4844  * Caller must NOT hold rtnl_lock; we need to release it here before we
4845  * set up our sysfs entries.
4846  */
4847 int bond_create(struct net *net, const char *name)
4848 {
4849         struct net_device *bond_dev;
4850         struct bonding *bond;
4851         struct alb_bond_info *bond_info;
4852         int res;
4853
4854         rtnl_lock();
4855
4856         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4857                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4858                                    bond_setup, tx_queues);
4859         if (!bond_dev) {
4860                 pr_err("%s: eek! can't alloc netdev!\n", name);
4861                 rtnl_unlock();
4862                 return -ENOMEM;
4863         }
4864
4865         /*
4866          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4867          * It is set to 0 by default which is wrong.
4868          */
4869         bond = netdev_priv(bond_dev);
4870         bond_info = &(BOND_ALB_INFO(bond));
4871         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4872
4873         dev_net_set(bond_dev, net);
4874         bond_dev->rtnl_link_ops = &bond_link_ops;
4875
4876         res = register_netdevice(bond_dev);
4877
4878         netif_carrier_off(bond_dev);
4879
4880         bond_work_init_all(bond);
4881
4882         rtnl_unlock();
4883         if (res < 0)
4884                 free_netdev(bond_dev);
4885         return res;
4886 }
4887
4888 static int __net_init bond_net_init(struct net *net)
4889 {
4890         struct bond_net *bn = net_generic(net, bond_net_id);
4891
4892         bn->net = net;
4893         INIT_LIST_HEAD(&bn->dev_list);
4894
4895         bond_create_proc_dir(bn);
4896         bond_create_sysfs(bn);
4897
4898         return 0;
4899 }
4900
4901 static void __net_exit bond_net_exit(struct net *net)
4902 {
4903         struct bond_net *bn = net_generic(net, bond_net_id);
4904         struct bonding *bond, *tmp_bond;
4905         LIST_HEAD(list);
4906
4907         bond_destroy_sysfs(bn);
4908
4909         /* Kill off any bonds created after unregistering bond rtnl ops */
4910         rtnl_lock();
4911         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4912                 unregister_netdevice_queue(bond->dev, &list);
4913         unregister_netdevice_many(&list);
4914         rtnl_unlock();
4915
4916         bond_destroy_proc_dir(bn);
4917 }
4918
4919 static struct pernet_operations bond_net_ops = {
4920         .init = bond_net_init,
4921         .exit = bond_net_exit,
4922         .id   = &bond_net_id,
4923         .size = sizeof(struct bond_net),
4924 };
4925
4926 static int __init bonding_init(void)
4927 {
4928         int i;
4929         int res;
4930
4931         pr_info("%s", bond_version);
4932
4933         res = bond_check_params(&bonding_defaults);
4934         if (res)
4935                 goto out;
4936
4937         res = register_pernet_subsys(&bond_net_ops);
4938         if (res)
4939                 goto out;
4940
4941         res = bond_netlink_init();
4942         if (res)
4943                 goto err_link;
4944
4945         bond_create_debugfs();
4946
4947         for (i = 0; i < max_bonds; i++) {
4948                 res = bond_create(&init_net, NULL);
4949                 if (res)
4950                         goto err;
4951         }
4952
4953         skb_flow_dissector_init(&flow_keys_bonding,
4954                                 flow_keys_bonding_keys,
4955                                 ARRAY_SIZE(flow_keys_bonding_keys));
4956
4957         register_netdevice_notifier(&bond_netdev_notifier);
4958 out:
4959         return res;
4960 err:
4961         bond_destroy_debugfs();
4962         bond_netlink_fini();
4963 err_link:
4964         unregister_pernet_subsys(&bond_net_ops);
4965         goto out;
4966
4967 }
4968
4969 static void __exit bonding_exit(void)
4970 {
4971         unregister_netdevice_notifier(&bond_netdev_notifier);
4972
4973         bond_destroy_debugfs();
4974
4975         bond_netlink_fini();
4976         unregister_pernet_subsys(&bond_net_ops);
4977
4978 #ifdef CONFIG_NET_POLL_CONTROLLER
4979         /* Make sure we don't have an imbalance on our netpoll blocking */
4980         WARN_ON(atomic_read(&netpoll_block_tx));
4981 #endif
4982 }
4983
4984 module_init(bonding_init);
4985 module_exit(bonding_exit);
4986 MODULE_LICENSE("GPL");
4987 MODULE_VERSION(DRV_VERSION);
4988 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4989 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");