drivers/net/bonding/bond_main.c

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