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 /* bond_do_fail_over_mac
 629  *
 630  * Perform special MAC address swapping for fail_over_mac settings
 631  *
 632  * Called with RTNL
 633  */
 634 static void bond_do_fail_over_mac(struct bonding *bond,
 635                                   struct slave *new_active,
 636                                   struct slave *old_active)
 637 {
 638         u8 tmp_mac[ETH_ALEN];
 639         struct sockaddr saddr;
 640         int rv;
 641
 642         switch (bond->params.fail_over_mac) {
 643         case BOND_FOM_ACTIVE:
 644                 if (new_active)
 645                         bond_set_dev_addr(bond->dev, new_active->dev);
 646                 break;
 647         case BOND_FOM_FOLLOW:
 648                 /* if new_active && old_active, swap them
 649                  * if just old_active, do nothing (going to no active slave)
 650                  * if just new_active, set new_active to bond's MAC
 651                  */
 652                 if (!new_active)
 653                         return;
 654
 655                 if (old_active) {
 656                         ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
 657                         ether_addr_copy(saddr.sa_data,
 658                                         old_active->dev->dev_addr);
 659                         saddr.sa_family = new_active->dev->type;
 660                 } else {
 661                         ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
 662                         saddr.sa_family = bond->dev->type;
 663                 }
 664
 665                 rv = dev_set_mac_address(new_active->dev, &saddr);
 666                 if (rv) {
 667                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 668                                    -rv, new_active->dev->name);
 669                         goto out;
 670                 }
 671
 672                 if (!old_active)
 673                         goto out;
 674
 675                 ether_addr_copy(saddr.sa_data, tmp_mac);
 676                 saddr.sa_family = old_active->dev->type;
 677
 678                 rv = dev_set_mac_address(old_active->dev, &saddr);
 679                 if (rv)
 680                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 681                                    -rv, new_active->dev->name);
 682 out:
 683                 break;
 684         default:
 685                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 686                            bond->params.fail_over_mac);
 687                 break;
 688         }
 689
 690 }
 691
 692 static bool bond_should_change_active(struct bonding *bond)
 693 {
 694         struct slave *prim = rtnl_dereference(bond->primary_slave);
 695         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 696
 697         if (!prim || !curr || curr->link != BOND_LINK_UP)
 698                 return true;
 699         if (bond->force_primary) {
 700                 bond->force_primary = false;
 701                 return true;
 702         }
 703         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 704             (prim->speed < curr->speed ||
 705              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 706                 return false;
 707         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 708                 return false;
 709         return true;
 710 }
 711
 712 /**
 713  * find_best_interface - select the best available slave to be the active one
 714  * @bond: our bonding struct
 715  */
 716 static struct slave *bond_find_best_slave(struct bonding *bond)
 717 {
 718         struct slave *slave, *bestslave = NULL, *primary;
 719         struct list_head *iter;
 720         int mintime = bond->params.updelay;
 721
 722         primary = rtnl_dereference(bond->primary_slave);
 723         if (primary && primary->link == BOND_LINK_UP &&
 724             bond_should_change_active(bond))
 725                 return primary;
 726
 727         bond_for_each_slave(bond, slave, iter) {
 728                 if (slave->link == BOND_LINK_UP)
 729                         return slave;
 730                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 731                     slave->delay < mintime) {
 732                         mintime = slave->delay;
 733                         bestslave = slave;
 734                 }
 735         }
 736
 737         return bestslave;
 738 }
 739
 740 static bool bond_should_notify_peers(struct bonding *bond)
 741 {
 742         struct slave *slave;
 743
 744         rcu_read_lock();
 745         slave = rcu_dereference(bond->curr_active_slave);
 746         rcu_read_unlock();
 747
 748         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 749                    slave ? slave->dev->name : "NULL");
 750
 751         if (!slave || !bond->send_peer_notif ||
 752             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 753                 return false;
 754
 755         return true;
 756 }
 757
 758 /**
 759  * change_active_interface - change the active slave into the specified one
 760  * @bond: our bonding struct
 761  * @new: the new slave to make the active one
 762  *
 763  * Set the new slave to the bond's settings and unset them on the old
 764  * curr_active_slave.
 765  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 766  *
 767  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 768  * because it is apparently the best available slave we have, even though its
 769  * updelay hasn't timed out yet.
 770  *
 771  * Caller must hold RTNL.
 772  */
 773 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 774 {
 775         struct slave *old_active;
 776
 777         ASSERT_RTNL();
 778
 779         old_active = rtnl_dereference(bond->curr_active_slave);
 780
 781         if (old_active == new_active)
 782                 return;
 783
 784         if (new_active) {
 785                 new_active->last_link_up = jiffies;
 786
 787                 if (new_active->link == BOND_LINK_BACK) {
 788                         if (bond_uses_primary(bond)) {
 789                                 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
 790                                             new_active->dev->name,
 791                                             (bond->params.updelay - new_active->delay) * bond->params.miimon);
 792                         }
 793
 794                         new_active->delay = 0;
 795                         bond_set_slave_link_state(new_active, BOND_LINK_UP);
 796
 797                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 798                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 799
 800                         if (bond_is_lb(bond))
 801                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 802                 } else {
 803                         if (bond_uses_primary(bond)) {
 804                                 netdev_info(bond->dev, "making interface %s the new active one\n",
 805                                             new_active->dev->name);
 806                         }
 807                 }
 808         }
 809
 810         if (bond_uses_primary(bond))
 811                 bond_hw_addr_swap(bond, new_active, old_active);
 812
 813         if (bond_is_lb(bond)) {
 814                 bond_alb_handle_active_change(bond, new_active);
 815                 if (old_active)
 816                         bond_set_slave_inactive_flags(old_active,
 817                                                       BOND_SLAVE_NOTIFY_NOW);
 818                 if (new_active)
 819                         bond_set_slave_active_flags(new_active,
 820                                                     BOND_SLAVE_NOTIFY_NOW);
 821         } else {
 822                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 823         }
 824
 825         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
 826                 if (old_active)
 827                         bond_set_slave_inactive_flags(old_active,
 828                                                       BOND_SLAVE_NOTIFY_NOW);
 829
 830                 if (new_active) {
 831                         bool should_notify_peers = false;
 832
 833                         bond_set_slave_active_flags(new_active,
 834                                                     BOND_SLAVE_NOTIFY_NOW);
 835
 836                         if (bond->params.fail_over_mac)
 837                                 bond_do_fail_over_mac(bond, new_active,
 838                                                       old_active);
 839
 840                         if (netif_running(bond->dev)) {
 841                                 bond->send_peer_notif =
 842                                         bond->params.num_peer_notif;
 843                                 should_notify_peers =
 844                                         bond_should_notify_peers(bond);
 845                         }
 846
 847                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 848                         if (should_notify_peers)
 849                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 850                                                          bond->dev);
 851                 }
 852         }
 853
 854         /* resend IGMP joins since active slave has changed or
 855          * all were sent on curr_active_slave.
 856          * resend only if bond is brought up with the affected
 857          * bonding modes and the retransmission is enabled
 858          */
 859         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 860             ((bond_uses_primary(bond) && new_active) ||
 861              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
 862                 bond->igmp_retrans = bond->params.resend_igmp;
 863                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 864         }
 865 }
 866
 867 /**
 868  * bond_select_active_slave - select a new active slave, if needed
 869  * @bond: our bonding struct
 870  *
 871  * This functions should be called when one of the following occurs:
 872  * - The old curr_active_slave has been released or lost its link.
 873  * - The primary_slave has got its link back.
 874  * - A slave has got its link back and there's no old curr_active_slave.
 875  *
 876  * Caller must hold RTNL.
 877  */
 878 void bond_select_active_slave(struct bonding *bond)
 879 {
 880         struct slave *best_slave;
 881         int rv;
 882
 883         ASSERT_RTNL();
 884
 885         best_slave = bond_find_best_slave(bond);
 886         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
 887                 bond_change_active_slave(bond, best_slave);
 888                 rv = bond_set_carrier(bond);
 889                 if (!rv)
 890                         return;
 891
 892                 if (netif_carrier_ok(bond->dev)) {
 893                         netdev_info(bond->dev, "first active interface up!\n");
 894                 } else {
 895                         netdev_info(bond->dev, "now running without any active interface!\n");
 896                 }
 897         }
 898 }
 899
 900 #ifdef CONFIG_NET_POLL_CONTROLLER
 901 static inline int slave_enable_netpoll(struct slave *slave)
 902 {
 903         struct netpoll *np;
 904         int err = 0;
 905
 906         np = kzalloc(sizeof(*np), GFP_KERNEL);
 907         err = -ENOMEM;
 908         if (!np)
 909                 goto out;
 910
 911         err = __netpoll_setup(np, slave->dev);
 912         if (err) {
 913                 kfree(np);
 914                 goto out;
 915         }
 916         slave->np = np;
 917 out:
 918         return err;
 919 }
 920 static inline void slave_disable_netpoll(struct slave *slave)
 921 {
 922         struct netpoll *np = slave->np;
 923
 924         if (!np)
 925                 return;
 926
 927         slave->np = NULL;
 928         __netpoll_free_async(np);
 929 }
 930
 931 static void bond_poll_controller(struct net_device *bond_dev)
 932 {
 933         struct bonding *bond = netdev_priv(bond_dev);
 934         struct slave *slave = NULL;
 935         struct list_head *iter;
 936         struct ad_info ad_info;
 937         struct netpoll_info *ni;
 938         const struct net_device_ops *ops;
 939
 940         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 941                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
 942                         return;
 943
 944         rcu_read_lock_bh();
 945         bond_for_each_slave_rcu(bond, slave, iter) {
 946                 ops = slave->dev->netdev_ops;
 947                 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
 948                         continue;
 949
 950                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 951                         struct aggregator *agg =
 952                             SLAVE_AD_INFO(slave)->port.aggregator;
 953
 954                         if (agg &&
 955                             agg->aggregator_identifier != ad_info.aggregator_id)
 956                                 continue;
 957                 }
 958
 959                 ni = rcu_dereference_bh(slave->dev->npinfo);
 960                 if (down_trylock(&ni->dev_lock))
 961                         continue;
 962                 ops->ndo_poll_controller(slave->dev);
 963                 up(&ni->dev_lock);
 964         }
 965         rcu_read_unlock_bh();
 966 }
 967
 968 static void bond_netpoll_cleanup(struct net_device *bond_dev)
 969 {
 970         struct bonding *bond = netdev_priv(bond_dev);
 971         struct list_head *iter;
 972         struct slave *slave;
 973
 974         bond_for_each_slave(bond, slave, iter)
 975                 if (bond_slave_is_up(slave))
 976                         slave_disable_netpoll(slave);
 977 }
 978
 979 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
 980 {
 981         struct bonding *bond = netdev_priv(dev);
 982         struct list_head *iter;
 983         struct slave *slave;
 984         int err = 0;
 985
 986         bond_for_each_slave(bond, slave, iter) {
 987                 err = slave_enable_netpoll(slave);
 988                 if (err) {
 989                         bond_netpoll_cleanup(dev);
 990                         break;
 991                 }
 992         }
 993         return err;
 994 }
 995 #else
 996 static inline int slave_enable_netpoll(struct slave *slave)
 997 {
 998         return 0;
 999 }
1000 static inline void slave_disable_netpoll(struct slave *slave)
1001 {
1002 }
1003 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1004 {
1005 }
1006 #endif
1007
1008 /*---------------------------------- IOCTL ----------------------------------*/
1009
1010 static netdev_features_t bond_fix_features(struct net_device *dev,
1011                                            netdev_features_t features)
1012 {
1013         struct bonding *bond = netdev_priv(dev);
1014         struct list_head *iter;
1015         netdev_features_t mask;
1016         struct slave *slave;
1017
1018         mask = features;
1019
1020         features &= ~NETIF_F_ONE_FOR_ALL;
1021         features |= NETIF_F_ALL_FOR_ALL;
1022
1023         bond_for_each_slave(bond, slave, iter) {
1024                 features = netdev_increment_features(features,
1025                                                      slave->dev->features,
1026                                                      mask);
1027         }
1028         features = netdev_add_tso_features(features, mask);
1029
1030         return features;
1031 }
1032
1033 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1034                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1035                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1036
1037 #define BOND_ENC_FEATURES       (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1038                                  NETIF_F_TSO)
1039
1040 static void bond_compute_features(struct bonding *bond)
1041 {
1042         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1043                                         IFF_XMIT_DST_RELEASE_PERM;
1044         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1045         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1046         struct net_device *bond_dev = bond->dev;
1047         struct list_head *iter;
1048         struct slave *slave;
1049         unsigned short max_hard_header_len = ETH_HLEN;
1050         unsigned int gso_max_size = GSO_MAX_SIZE;
1051         u16 gso_max_segs = GSO_MAX_SEGS;
1052
1053         if (!bond_has_slaves(bond))
1054                 goto done;
1055         vlan_features &= NETIF_F_ALL_FOR_ALL;
1056
1057         bond_for_each_slave(bond, slave, iter) {
1058                 vlan_features = netdev_increment_features(vlan_features,
1059                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1060
1061                 enc_features = netdev_increment_features(enc_features,
1062                                                          slave->dev->hw_enc_features,
1063                                                          BOND_ENC_FEATURES);
1064                 dst_release_flag &= slave->dev->priv_flags;
1065                 if (slave->dev->hard_header_len > max_hard_header_len)
1066                         max_hard_header_len = slave->dev->hard_header_len;
1067
1068                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1069                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1070         }
1071
1072 done:
1073         bond_dev->vlan_features = vlan_features;
1074         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1075         bond_dev->hard_header_len = max_hard_header_len;
1076         bond_dev->gso_max_segs = gso_max_segs;
1077         netif_set_gso_max_size(bond_dev, gso_max_size);
1078
1079         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1080         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1081             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1082                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1083
1084         netdev_change_features(bond_dev);
1085 }
1086
1087 static void bond_setup_by_slave(struct net_device *bond_dev,
1088                                 struct net_device *slave_dev)
1089 {
1090         bond_dev->header_ops        = slave_dev->header_ops;
1091
1092         bond_dev->type              = slave_dev->type;
1093         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1094         bond_dev->addr_len          = slave_dev->addr_len;
1095
1096         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1097                 slave_dev->addr_len);
1098 }
1099
1100 /* On bonding slaves other than the currently active slave, suppress
1101  * duplicates except for alb non-mcast/bcast.
1102  */
1103 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1104                                             struct slave *slave,
1105                                             struct bonding *bond)
1106 {
1107         if (bond_is_slave_inactive(slave)) {
1108                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1109                     skb->pkt_type != PACKET_BROADCAST &&
1110                     skb->pkt_type != PACKET_MULTICAST)
1111                         return false;
1112                 return true;
1113         }
1114         return false;
1115 }
1116
1117 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1118 {
1119         struct sk_buff *skb = *pskb;
1120         struct slave *slave;
1121         struct bonding *bond;
1122         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1123                           struct slave *);
1124         int ret = RX_HANDLER_ANOTHER;
1125
1126         skb = skb_share_check(skb, GFP_ATOMIC);
1127         if (unlikely(!skb))
1128                 return RX_HANDLER_CONSUMED;
1129
1130         *pskb = skb;
1131
1132         slave = bond_slave_get_rcu(skb->dev);
1133         bond = slave->bond;
1134
1135         recv_probe = ACCESS_ONCE(bond->recv_probe);
1136         if (recv_probe) {
1137                 ret = recv_probe(skb, bond, slave);
1138                 if (ret == RX_HANDLER_CONSUMED) {
1139                         consume_skb(skb);
1140                         return ret;
1141                 }
1142         }
1143
1144         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1145                 return RX_HANDLER_EXACT;
1146         }
1147
1148         skb->dev = bond->dev;
1149
1150         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1151             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1152             skb->pkt_type == PACKET_HOST) {
1153
1154                 if (unlikely(skb_cow_head(skb,
1155                                           skb->data - skb_mac_header(skb)))) {
1156                         kfree_skb(skb);
1157                         return RX_HANDLER_CONSUMED;
1158                 }
1159                 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1160         }
1161
1162         return ret;
1163 }
1164
1165 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1166                                       struct net_device *slave_dev,
1167                                       struct slave *slave)
1168 {
1169         int err;
1170
1171         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1172         if (err)
1173                 return err;
1174         slave_dev->flags |= IFF_SLAVE;
1175         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1176         return 0;
1177 }
1178
1179 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1180                                   struct net_device *slave_dev)
1181 {
1182         netdev_upper_dev_unlink(slave_dev, bond_dev);
1183         slave_dev->flags &= ~IFF_SLAVE;
1184         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1185 }
1186
1187 static struct slave *bond_alloc_slave(struct bonding *bond)
1188 {
1189         struct slave *slave = NULL;
1190
1191         slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1192         if (!slave)
1193                 return NULL;
1194
1195         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1196                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1197                                                GFP_KERNEL);
1198                 if (!SLAVE_AD_INFO(slave)) {
1199                         kfree(slave);
1200                         return NULL;
1201                 }
1202         }
1203         return slave;
1204 }
1205
1206 static void bond_free_slave(struct slave *slave)
1207 {
1208         struct bonding *bond = bond_get_bond_by_slave(slave);
1209
1210         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1211                 kfree(SLAVE_AD_INFO(slave));
1212
1213         kfree(slave);
1214 }
1215
1216 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1217 {
1218         info->bond_mode = BOND_MODE(bond);
1219         info->miimon = bond->params.miimon;
1220         info->num_slaves = bond->slave_cnt;
1221 }
1222
1223 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1224 {
1225         strcpy(info->slave_name, slave->dev->name);
1226         info->link = slave->link;
1227         info->state = bond_slave_state(slave);
1228         info->link_failure_count = slave->link_failure_count;
1229 }
1230
1231 static void bond_netdev_notify(struct net_device *dev,
1232                                struct netdev_bonding_info *info)
1233 {
1234         rtnl_lock();
1235         netdev_bonding_info_change(dev, info);
1236         rtnl_unlock();
1237 }
1238
1239 static void bond_netdev_notify_work(struct work_struct *_work)
1240 {
1241         struct netdev_notify_work *w =
1242                 container_of(_work, struct netdev_notify_work, work.work);
1243
1244         bond_netdev_notify(w->dev, &w->bonding_info);
1245         dev_put(w->dev);
1246         kfree(w);
1247 }
1248
1249 void bond_queue_slave_event(struct slave *slave)
1250 {
1251         struct bonding *bond = slave->bond;
1252         struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1253
1254         if (!nnw)
1255                 return;
1256
1257         dev_hold(slave->dev);
1258         nnw->dev = slave->dev;
1259         bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1260         bond_fill_ifbond(bond, &nnw->bonding_info.master);
1261         INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1262
1263         queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1264 }
1265
1266 /* enslave device <slave> to bond device <master> */
1267 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1268 {
1269         struct bonding *bond = netdev_priv(bond_dev);
1270         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1271         struct slave *new_slave = NULL, *prev_slave;
1272         struct sockaddr addr;
1273         int link_reporting;
1274         int res = 0, i;
1275
1276         if (!bond->params.use_carrier &&
1277             slave_dev->ethtool_ops->get_link == NULL &&
1278             slave_ops->ndo_do_ioctl == NULL) {
1279                 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1280                             slave_dev->name);
1281         }
1282
1283         /* already enslaved */
1284         if (slave_dev->flags & IFF_SLAVE) {
1285                 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1286                 return -EBUSY;
1287         }
1288
1289         if (bond_dev == slave_dev) {
1290                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1291                 return -EPERM;
1292         }
1293
1294         /* vlan challenged mutual exclusion */
1295         /* no need to lock since we're protected by rtnl_lock */
1296         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1297                 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1298                            slave_dev->name);
1299                 if (vlan_uses_dev(bond_dev)) {
1300                         netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1301                                    slave_dev->name, bond_dev->name);
1302                         return -EPERM;
1303                 } else {
1304                         netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1305                                     slave_dev->name, slave_dev->name,
1306                                     bond_dev->name);
1307                 }
1308         } else {
1309                 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1310                            slave_dev->name);
1311         }
1312
1313         /* Old ifenslave binaries are no longer supported.  These can
1314          * be identified with moderate accuracy by the state of the slave:
1315          * the current ifenslave will set the interface down prior to
1316          * enslaving it; the old ifenslave will not.
1317          */
1318         if ((slave_dev->flags & IFF_UP)) {
1319                 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1320                            slave_dev->name);
1321                 res = -EPERM;
1322                 goto err_undo_flags;
1323         }
1324
1325         /* set bonding device ether type by slave - bonding netdevices are
1326          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1327          * there is a need to override some of the type dependent attribs/funcs.
1328          *
1329          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1330          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1331          */
1332         if (!bond_has_slaves(bond)) {
1333                 if (bond_dev->type != slave_dev->type) {
1334                         netdev_dbg(bond_dev, "change device type from %d to %d\n",
1335                                    bond_dev->type, slave_dev->type);
1336
1337                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1338                                                        bond_dev);
1339                         res = notifier_to_errno(res);
1340                         if (res) {
1341                                 netdev_err(bond_dev, "refused to change device type\n");
1342                                 res = -EBUSY;
1343                                 goto err_undo_flags;
1344                         }
1345
1346                         /* Flush unicast and multicast addresses */
1347                         dev_uc_flush(bond_dev);
1348                         dev_mc_flush(bond_dev);
1349
1350                         if (slave_dev->type != ARPHRD_ETHER)
1351                                 bond_setup_by_slave(bond_dev, slave_dev);
1352                         else {
1353                                 ether_setup(bond_dev);
1354                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1355                         }
1356
1357                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1358                                                  bond_dev);
1359                 }
1360         } else if (bond_dev->type != slave_dev->type) {
1361                 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1362                            slave_dev->name, slave_dev->type, bond_dev->type);
1363                 res = -EINVAL;
1364                 goto err_undo_flags;
1365         }
1366
1367         if (slave_ops->ndo_set_mac_address == NULL) {
1368                 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1369                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1370                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1371                         if (!bond_has_slaves(bond)) {
1372                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1373                                 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1374                         } else {
1375                                 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");
1376                                 res = -EOPNOTSUPP;
1377                                 goto err_undo_flags;
1378                         }
1379                 }
1380         }
1381
1382         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1383
1384         /* If this is the first slave, then we need to set the master's hardware
1385          * address to be the same as the slave's.
1386          */
1387         if (!bond_has_slaves(bond) &&
1388             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1389                 bond_set_dev_addr(bond->dev, slave_dev);
1390
1391         new_slave = bond_alloc_slave(bond);
1392         if (!new_slave) {
1393                 res = -ENOMEM;
1394                 goto err_undo_flags;
1395         }
1396
1397         new_slave->bond = bond;
1398         new_slave->dev = slave_dev;
1399         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1400          * is set via sysfs or module option if desired.
1401          */
1402         new_slave->queue_id = 0;
1403
1404         /* Save slave's original mtu and then set it to match the bond */
1405         new_slave->original_mtu = slave_dev->mtu;
1406         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1407         if (res) {
1408                 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1409                 goto err_free;
1410         }
1411
1412         /* Save slave's original ("permanent") mac address for modes
1413          * that need it, and for restoring it upon release, and then
1414          * set it to the master's address
1415          */
1416         ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1417
1418         if (!bond->params.fail_over_mac ||
1419             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1420                 /* Set slave to master's mac address.  The application already
1421                  * set the master's mac address to that of the first slave
1422                  */
1423                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1424                 addr.sa_family = slave_dev->type;
1425                 res = dev_set_mac_address(slave_dev, &addr);
1426                 if (res) {
1427                         netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1428                         goto err_restore_mtu;
1429                 }
1430         }
1431
1432         /* open the slave since the application closed it */
1433         res = dev_open(slave_dev);
1434         if (res) {
1435                 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1436                 goto err_restore_mac;
1437         }
1438
1439         slave_dev->priv_flags |= IFF_BONDING;
1440         /* initialize slave stats */
1441         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1442
1443         if (bond_is_lb(bond)) {
1444                 /* bond_alb_init_slave() must be called before all other stages since
1445                  * it might fail and we do not want to have to undo everything
1446                  */
1447                 res = bond_alb_init_slave(bond, new_slave);
1448                 if (res)
1449                         goto err_close;
1450         }
1451
1452         /* If the mode uses primary, then the following is handled by
1453          * bond_change_active_slave().
1454          */
1455         if (!bond_uses_primary(bond)) {
1456                 /* set promiscuity level to new slave */
1457                 if (bond_dev->flags & IFF_PROMISC) {
1458                         res = dev_set_promiscuity(slave_dev, 1);
1459                         if (res)
1460                                 goto err_close;
1461                 }
1462
1463                 /* set allmulti level to new slave */
1464                 if (bond_dev->flags & IFF_ALLMULTI) {
1465                         res = dev_set_allmulti(slave_dev, 1);
1466                         if (res)
1467                                 goto err_close;
1468                 }
1469
1470                 netif_addr_lock_bh(bond_dev);
1471
1472                 dev_mc_sync_multiple(slave_dev, bond_dev);
1473                 dev_uc_sync_multiple(slave_dev, bond_dev);
1474
1475                 netif_addr_unlock_bh(bond_dev);
1476         }
1477
1478         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1479                 /* add lacpdu mc addr to mc list */
1480                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1481
1482                 dev_mc_add(slave_dev, lacpdu_multicast);
1483         }
1484
1485         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1486         if (res) {
1487                 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1488                            slave_dev->name);
1489                 goto err_close;
1490         }
1491
1492         prev_slave = bond_last_slave(bond);
1493
1494         new_slave->delay = 0;
1495         new_slave->link_failure_count = 0;
1496
1497         bond_update_speed_duplex(new_slave);
1498
1499         new_slave->last_rx = jiffies -
1500                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1501         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1502                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1503
1504         if (bond->params.miimon && !bond->params.use_carrier) {
1505                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1506
1507                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1508                         /* miimon is set but a bonded network driver
1509                          * does not support ETHTOOL/MII and
1510                          * arp_interval is not set.  Note: if
1511                          * use_carrier is enabled, we will never go
1512                          * here (because netif_carrier is always
1513                          * supported); thus, we don't need to change
1514                          * the messages for netif_carrier.
1515                          */
1516                         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",
1517                                     slave_dev->name);
1518                 } else if (link_reporting == -1) {
1519                         /* unable get link status using mii/ethtool */
1520                         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",
1521                                     slave_dev->name);
1522                 }
1523         }
1524
1525         /* check for initial state */
1526         if (bond->params.miimon) {
1527                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1528                         if (bond->params.updelay) {
1529                                 bond_set_slave_link_state(new_slave,
1530                                                           BOND_LINK_BACK);
1531                                 new_slave->delay = bond->params.updelay;
1532                         } else {
1533                                 bond_set_slave_link_state(new_slave,
1534                                                           BOND_LINK_UP);
1535                         }
1536                 } else {
1537                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN);
1538                 }
1539         } else if (bond->params.arp_interval) {
1540                 bond_set_slave_link_state(new_slave,
1541                                           (netif_carrier_ok(slave_dev) ?
1542                                           BOND_LINK_UP : BOND_LINK_DOWN));
1543         } else {
1544                 bond_set_slave_link_state(new_slave, BOND_LINK_UP);
1545         }
1546
1547         if (new_slave->link != BOND_LINK_DOWN)
1548                 new_slave->last_link_up = jiffies;
1549         netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1550                    new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1551                    (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1552
1553         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1554                 /* if there is a primary slave, remember it */
1555                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1556                         rcu_assign_pointer(bond->primary_slave, new_slave);
1557                         bond->force_primary = true;
1558                 }
1559         }
1560
1561         switch (BOND_MODE(bond)) {
1562         case BOND_MODE_ACTIVEBACKUP:
1563                 bond_set_slave_inactive_flags(new_slave,
1564                                               BOND_SLAVE_NOTIFY_NOW);
1565                 break;
1566         case BOND_MODE_8023AD:
1567                 /* in 802.3ad mode, the internal mechanism
1568                  * will activate the slaves in the selected
1569                  * aggregator
1570                  */
1571                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1572                 /* if this is the first slave */
1573                 if (!prev_slave) {
1574                         SLAVE_AD_INFO(new_slave)->id = 1;
1575                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1576                          * can be called only after the mac address of the bond is set
1577                          */
1578                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1579                 } else {
1580                         SLAVE_AD_INFO(new_slave)->id =
1581                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1582                 }
1583
1584                 bond_3ad_bind_slave(new_slave);
1585                 break;
1586         case BOND_MODE_TLB:
1587         case BOND_MODE_ALB:
1588                 bond_set_active_slave(new_slave);
1589                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1590                 break;
1591         default:
1592                 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1593
1594                 /* always active in trunk mode */
1595                 bond_set_active_slave(new_slave);
1596
1597                 /* In trunking mode there is little meaning to curr_active_slave
1598                  * anyway (it holds no special properties of the bond device),
1599                  * so we can change it without calling change_active_interface()
1600                  */
1601                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1602                     new_slave->link == BOND_LINK_UP)
1603                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1604
1605                 break;
1606         } /* switch(bond_mode) */
1607
1608 #ifdef CONFIG_NET_POLL_CONTROLLER
1609         slave_dev->npinfo = bond->dev->npinfo;
1610         if (slave_dev->npinfo) {
1611                 if (slave_enable_netpoll(new_slave)) {
1612                         netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1613                         res = -EBUSY;
1614                         goto err_detach;
1615                 }
1616         }
1617 #endif
1618
1619         if (!(bond_dev->features & NETIF_F_LRO))
1620                 dev_disable_lro(slave_dev);
1621
1622         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1623                                          new_slave);
1624         if (res) {
1625                 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1626                 goto err_detach;
1627         }
1628
1629         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1630         if (res) {
1631                 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1632                 goto err_unregister;
1633         }
1634
1635         res = bond_sysfs_slave_add(new_slave);
1636         if (res) {
1637                 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1638                 goto err_upper_unlink;
1639         }
1640
1641         bond->slave_cnt++;
1642         bond_compute_features(bond);
1643         bond_set_carrier(bond);
1644
1645         if (bond_uses_primary(bond)) {
1646                 block_netpoll_tx();
1647                 bond_select_active_slave(bond);
1648                 unblock_netpoll_tx();
1649         }
1650
1651         if (bond_mode_uses_xmit_hash(bond))
1652                 bond_update_slave_arr(bond, NULL);
1653
1654         netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1655                     slave_dev->name,
1656                     bond_is_active_slave(new_slave) ? "an active" : "a backup",
1657                     new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1658
1659         /* enslave is successful */
1660         bond_queue_slave_event(new_slave);
1661         return 0;
1662
1663 /* Undo stages on error */
1664 err_upper_unlink:
1665         bond_upper_dev_unlink(bond_dev, slave_dev);
1666
1667 err_unregister:
1668         netdev_rx_handler_unregister(slave_dev);
1669
1670 err_detach:
1671         if (!bond_uses_primary(bond))
1672                 bond_hw_addr_flush(bond_dev, slave_dev);
1673
1674         vlan_vids_del_by_dev(slave_dev, bond_dev);
1675         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1676                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1677         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1678                 block_netpoll_tx();
1679                 bond_change_active_slave(bond, NULL);
1680                 bond_select_active_slave(bond);
1681                 unblock_netpoll_tx();
1682         }
1683         /* either primary_slave or curr_active_slave might've changed */
1684         synchronize_rcu();
1685         slave_disable_netpoll(new_slave);
1686
1687 err_close:
1688         slave_dev->priv_flags &= ~IFF_BONDING;
1689         dev_close(slave_dev);
1690
1691 err_restore_mac:
1692         if (!bond->params.fail_over_mac ||
1693             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1694                 /* XXX TODO - fom follow mode needs to change master's
1695                  * MAC if this slave's MAC is in use by the bond, or at
1696                  * least print a warning.
1697                  */
1698                 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1699                 addr.sa_family = slave_dev->type;
1700                 dev_set_mac_address(slave_dev, &addr);
1701         }
1702
1703 err_restore_mtu:
1704         dev_set_mtu(slave_dev, new_slave->original_mtu);
1705
1706 err_free:
1707         bond_free_slave(new_slave);
1708
1709 err_undo_flags:
1710         /* Enslave of first slave has failed and we need to fix master's mac */
1711         if (!bond_has_slaves(bond) &&
1712             ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1713                 eth_hw_addr_random(bond_dev);
1714
1715         return res;
1716 }
1717
1718 /* Try to release the slave device <slave> from the bond device <master>
1719  * It is legal to access curr_active_slave without a lock because all the function
1720  * is RTNL-locked. If "all" is true it means that the function is being called
1721  * while destroying a bond interface and all slaves are being released.
1722  *
1723  * The rules for slave state should be:
1724  *   for Active/Backup:
1725  *     Active stays on all backups go down
1726  *   for Bonded connections:
1727  *     The first up interface should be left on and all others downed.
1728  */
1729 static int __bond_release_one(struct net_device *bond_dev,
1730                               struct net_device *slave_dev,
1731                               bool all)
1732 {
1733         struct bonding *bond = netdev_priv(bond_dev);
1734         struct slave *slave, *oldcurrent;
1735         struct sockaddr addr;
1736         int old_flags = bond_dev->flags;
1737         netdev_features_t old_features = bond_dev->features;
1738
1739         /* slave is not a slave or master is not master of this slave */
1740         if (!(slave_dev->flags & IFF_SLAVE) ||
1741             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1742                 netdev_dbg(bond_dev, "cannot release %s\n",
1743                            slave_dev->name);
1744                 return -EINVAL;
1745         }
1746
1747         block_netpoll_tx();
1748
1749         slave = bond_get_slave_by_dev(bond, slave_dev);
1750         if (!slave) {
1751                 /* not a slave of this bond */
1752                 netdev_info(bond_dev, "%s not enslaved\n",
1753                             slave_dev->name);
1754                 unblock_netpoll_tx();
1755                 return -EINVAL;
1756         }
1757
1758         bond_sysfs_slave_del(slave);
1759
1760         /* recompute stats just before removing the slave */
1761         bond_get_stats(bond->dev, &bond->bond_stats);
1762
1763         bond_upper_dev_unlink(bond_dev, slave_dev);
1764         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1765          * for this slave anymore.
1766          */
1767         netdev_rx_handler_unregister(slave_dev);
1768
1769         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1770                 bond_3ad_unbind_slave(slave);
1771
1772         if (bond_mode_uses_xmit_hash(bond))
1773                 bond_update_slave_arr(bond, slave);
1774
1775         netdev_info(bond_dev, "Releasing %s interface %s\n",
1776                     bond_is_active_slave(slave) ? "active" : "backup",
1777                     slave_dev->name);
1778
1779         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1780
1781         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1782
1783         if (!all && (!bond->params.fail_over_mac ||
1784                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1785                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1786                     bond_has_slaves(bond))
1787                         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",
1788                                     slave_dev->name, slave->perm_hwaddr,
1789                                     bond_dev->name, slave_dev->name);
1790         }
1791
1792         if (rtnl_dereference(bond->primary_slave) == slave)
1793                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1794
1795         if (oldcurrent == slave)
1796                 bond_change_active_slave(bond, NULL);
1797
1798         if (bond_is_lb(bond)) {
1799                 /* Must be called only after the slave has been
1800                  * detached from the list and the curr_active_slave
1801                  * has been cleared (if our_slave == old_current),
1802                  * but before a new active slave is selected.
1803                  */
1804                 bond_alb_deinit_slave(bond, slave);
1805         }
1806
1807         if (all) {
1808                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1809         } else if (oldcurrent == slave) {
1810                 /* Note that we hold RTNL over this sequence, so there
1811                  * is no concern that another slave add/remove event
1812                  * will interfere.
1813                  */
1814                 bond_select_active_slave(bond);
1815         }
1816
1817         if (!bond_has_slaves(bond)) {
1818                 bond_set_carrier(bond);
1819                 eth_hw_addr_random(bond_dev);
1820         }
1821
1822         unblock_netpoll_tx();
1823         synchronize_rcu();
1824         bond->slave_cnt--;
1825
1826         if (!bond_has_slaves(bond)) {
1827                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1828                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1829         }
1830
1831         bond_compute_features(bond);
1832         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1833             (old_features & NETIF_F_VLAN_CHALLENGED))
1834                 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1835                             slave_dev->name, bond_dev->name);
1836
1837         vlan_vids_del_by_dev(slave_dev, bond_dev);
1838
1839         /* If the mode uses primary, then this case was handled above by
1840          * bond_change_active_slave(..., NULL)
1841          */
1842         if (!bond_uses_primary(bond)) {
1843                 /* unset promiscuity level from slave
1844                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1845                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1846                  * value of that flag before that change, as that was the value
1847                  * when this slave was attached, so we cache at the start of the
1848                  * function and use it here. Same goes for ALLMULTI below
1849                  */
1850                 if (old_flags & IFF_PROMISC)
1851                         dev_set_promiscuity(slave_dev, -1);
1852
1853                 /* unset allmulti level from slave */
1854                 if (old_flags & IFF_ALLMULTI)
1855                         dev_set_allmulti(slave_dev, -1);
1856
1857                 bond_hw_addr_flush(bond_dev, slave_dev);
1858         }
1859
1860         slave_disable_netpoll(slave);
1861
1862         /* close slave before restoring its mac address */
1863         dev_close(slave_dev);
1864
1865         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1866             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1867                 /* restore original ("permanent") mac address */
1868                 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1869                 addr.sa_family = slave_dev->type;
1870                 dev_set_mac_address(slave_dev, &addr);
1871         }
1872
1873         dev_set_mtu(slave_dev, slave->original_mtu);
1874
1875         slave_dev->priv_flags &= ~IFF_BONDING;
1876
1877         bond_free_slave(slave);
1878
1879         return 0;
1880 }
1881
1882 /* A wrapper used because of ndo_del_link */
1883 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1884 {
1885         return __bond_release_one(bond_dev, slave_dev, false);
1886 }
1887
1888 /* First release a slave and then destroy the bond if no more slaves are left.
1889  * Must be under rtnl_lock when this function is called.
1890  */
1891 static int  bond_release_and_destroy(struct net_device *bond_dev,
1892                                      struct net_device *slave_dev)
1893 {
1894         struct bonding *bond = netdev_priv(bond_dev);
1895         int ret;
1896
1897         ret = bond_release(bond_dev, slave_dev);
1898         if (ret == 0 && !bond_has_slaves(bond)) {
1899                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1900                 netdev_info(bond_dev, "Destroying bond %s\n",
1901                             bond_dev->name);
1902                 unregister_netdevice(bond_dev);
1903         }
1904         return ret;
1905 }
1906
1907 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1908 {
1909         struct bonding *bond = netdev_priv(bond_dev);
1910         bond_fill_ifbond(bond, info);
1911         return 0;
1912 }
1913
1914 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1915 {
1916         struct bonding *bond = netdev_priv(bond_dev);
1917         struct list_head *iter;
1918         int i = 0, res = -ENODEV;
1919         struct slave *slave;
1920
1921         bond_for_each_slave(bond, slave, iter) {
1922                 if (i++ == (int)info->slave_id) {
1923                         res = 0;
1924                         bond_fill_ifslave(slave, info);
1925                         break;
1926                 }
1927         }
1928
1929         return res;
1930 }
1931
1932 /*-------------------------------- Monitoring -------------------------------*/
1933
1934 /* called with rcu_read_lock() */
1935 static int bond_miimon_inspect(struct bonding *bond)
1936 {
1937         int link_state, commit = 0;
1938         struct list_head *iter;
1939         struct slave *slave;
1940         bool ignore_updelay;
1941
1942         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1943
1944         bond_for_each_slave_rcu(bond, slave, iter) {
1945                 slave->new_link = BOND_LINK_NOCHANGE;
1946
1947                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1948
1949                 switch (slave->link) {
1950                 case BOND_LINK_UP:
1951                         if (link_state)
1952                                 continue;
1953
1954                         bond_set_slave_link_state(slave, BOND_LINK_FAIL);
1955                         slave->delay = bond->params.downdelay;
1956                         if (slave->delay) {
1957                                 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
1958                                             (BOND_MODE(bond) ==
1959                                              BOND_MODE_ACTIVEBACKUP) ?
1960                                              (bond_is_active_slave(slave) ?
1961                                               "active " : "backup ") : "",
1962                                             slave->dev->name,
1963                                             bond->params.downdelay * bond->params.miimon);
1964                         }
1965                         /*FALLTHRU*/
1966                 case BOND_LINK_FAIL:
1967                         if (link_state) {
1968                                 /* recovered before downdelay expired */
1969                                 bond_set_slave_link_state(slave, BOND_LINK_UP);
1970                                 slave->last_link_up = jiffies;
1971                                 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
1972                                             (bond->params.downdelay - slave->delay) *
1973                                             bond->params.miimon,
1974                                             slave->dev->name);
1975                                 continue;
1976                         }
1977
1978                         if (slave->delay <= 0) {
1979                                 slave->new_link = BOND_LINK_DOWN;
1980                                 commit++;
1981                                 continue;
1982                         }
1983
1984                         slave->delay--;
1985                         break;
1986
1987                 case BOND_LINK_DOWN:
1988                         if (!link_state)
1989                                 continue;
1990
1991                         bond_set_slave_link_state(slave, BOND_LINK_BACK);
1992                         slave->delay = bond->params.updelay;
1993
1994                         if (slave->delay) {
1995                                 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
1996                                             slave->dev->name,
1997                                             ignore_updelay ? 0 :
1998                                             bond->params.updelay *
1999                                             bond->params.miimon);
2000                         }
2001                         /*FALLTHRU*/
2002                 case BOND_LINK_BACK:
2003                         if (!link_state) {
2004                                 bond_set_slave_link_state(slave,
2005                                                           BOND_LINK_DOWN);
2006                                 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2007                                             (bond->params.updelay - slave->delay) *
2008                                             bond->params.miimon,
2009                                             slave->dev->name);
2010
2011                                 continue;
2012                         }
2013
2014                         if (ignore_updelay)
2015                                 slave->delay = 0;
2016
2017                         if (slave->delay <= 0) {
2018                                 slave->new_link = BOND_LINK_UP;
2019                                 commit++;
2020                                 ignore_updelay = false;
2021                                 continue;
2022                         }
2023
2024                         slave->delay--;
2025                         break;
2026                 }
2027         }
2028
2029         return commit;
2030 }
2031
2032 static void bond_miimon_commit(struct bonding *bond)
2033 {
2034         struct list_head *iter;
2035         struct slave *slave, *primary;
2036
2037         bond_for_each_slave(bond, slave, iter) {
2038                 switch (slave->new_link) {
2039                 case BOND_LINK_NOCHANGE:
2040                         continue;
2041
2042                 case BOND_LINK_UP:
2043                         bond_set_slave_link_state(slave, BOND_LINK_UP);
2044                         slave->last_link_up = jiffies;
2045
2046                         primary = rtnl_dereference(bond->primary_slave);
2047                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2048                                 /* prevent it from being the active one */
2049                                 bond_set_backup_slave(slave);
2050                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2051                                 /* make it immediately active */
2052                                 bond_set_active_slave(slave);
2053                         } else if (slave != primary) {
2054                                 /* prevent it from being the active one */
2055                                 bond_set_backup_slave(slave);
2056                         }
2057
2058                         netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2059                                     slave->dev->name,
2060                                     slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2061                                     slave->duplex ? "full" : "half");
2062
2063                         /* notify ad that the link status has changed */
2064                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2065                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2066
2067                         if (bond_is_lb(bond))
2068                                 bond_alb_handle_link_change(bond, slave,
2069                                                             BOND_LINK_UP);
2070
2071                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2072                                 bond_update_slave_arr(bond, NULL);
2073
2074                         if (!bond->curr_active_slave || slave == primary)
2075                                 goto do_failover;
2076
2077                         continue;
2078
2079                 case BOND_LINK_DOWN:
2080                         if (slave->link_failure_count < UINT_MAX)
2081                                 slave->link_failure_count++;
2082
2083                         bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2084
2085                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2086                             BOND_MODE(bond) == BOND_MODE_8023AD)
2087                                 bond_set_slave_inactive_flags(slave,
2088                                                               BOND_SLAVE_NOTIFY_NOW);
2089
2090                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2091                                     slave->dev->name);
2092
2093                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2094                                 bond_3ad_handle_link_change(slave,
2095                                                             BOND_LINK_DOWN);
2096
2097                         if (bond_is_lb(bond))
2098                                 bond_alb_handle_link_change(bond, slave,
2099                                                             BOND_LINK_DOWN);
2100
2101                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2102                                 bond_update_slave_arr(bond, NULL);
2103
2104                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2105                                 goto do_failover;
2106
2107                         continue;
2108
2109                 default:
2110                         netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2111                                    slave->new_link, slave->dev->name);
2112                         slave->new_link = BOND_LINK_NOCHANGE;
2113
2114                         continue;
2115                 }
2116
2117 do_failover:
2118                 block_netpoll_tx();
2119                 bond_select_active_slave(bond);
2120                 unblock_netpoll_tx();
2121         }
2122
2123         bond_set_carrier(bond);
2124 }
2125
2126 /* bond_mii_monitor
2127  *
2128  * Really a wrapper that splits the mii monitor into two phases: an
2129  * inspection, then (if inspection indicates something needs to be done)
2130  * an acquisition of appropriate locks followed by a commit phase to
2131  * implement whatever link state changes are indicated.
2132  */
2133 static void bond_mii_monitor(struct work_struct *work)
2134 {
2135         struct bonding *bond = container_of(work, struct bonding,
2136                                             mii_work.work);
2137         bool should_notify_peers = false;
2138         unsigned long delay;
2139
2140         delay = msecs_to_jiffies(bond->params.miimon);
2141
2142         if (!bond_has_slaves(bond))
2143                 goto re_arm;
2144
2145         rcu_read_lock();
2146
2147         should_notify_peers = bond_should_notify_peers(bond);
2148
2149         if (bond_miimon_inspect(bond)) {
2150                 rcu_read_unlock();
2151
2152                 /* Race avoidance with bond_close cancel of workqueue */
2153                 if (!rtnl_trylock()) {
2154                         delay = 1;
2155                         should_notify_peers = false;
2156                         goto re_arm;
2157                 }
2158
2159                 bond_miimon_commit(bond);
2160
2161                 rtnl_unlock();  /* might sleep, hold no other locks */
2162         } else
2163                 rcu_read_unlock();
2164
2165 re_arm:
2166         if (bond->params.miimon)
2167                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2168
2169         if (should_notify_peers) {
2170                 if (!rtnl_trylock())
2171                         return;
2172                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2173                 rtnl_unlock();
2174         }
2175 }
2176
2177 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2178 {
2179         struct net_device *upper;
2180         struct list_head *iter;
2181         bool ret = false;
2182
2183         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2184                 return true;
2185
2186         rcu_read_lock();
2187         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2188                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2189                         ret = true;
2190                         break;
2191                 }
2192         }
2193         rcu_read_unlock();
2194
2195         return ret;
2196 }
2197
2198 /* We go to the (large) trouble of VLAN tagging ARP frames because
2199  * switches in VLAN mode (especially if ports are configured as
2200  * "native" to a VLAN) might not pass non-tagged frames.
2201  */
2202 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2203                           __be32 dest_ip, __be32 src_ip,
2204                           struct bond_vlan_tag *tags)
2205 {
2206         struct sk_buff *skb;
2207         struct bond_vlan_tag *outer_tag = tags;
2208
2209         netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2210                    arp_op, slave_dev->name, &dest_ip, &src_ip);
2211
2212         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2213                          NULL, slave_dev->dev_addr, NULL);
2214
2215         if (!skb) {
2216                 net_err_ratelimited("ARP packet allocation failed\n");
2217                 return;
2218         }
2219
2220         if (!tags || tags->vlan_proto == VLAN_N_VID)
2221                 goto xmit;
2222
2223         tags++;
2224
2225         /* Go through all the tags backwards and add them to the packet */
2226         while (tags->vlan_proto != VLAN_N_VID) {
2227                 if (!tags->vlan_id) {
2228                         tags++;
2229                         continue;
2230                 }
2231
2232                 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2233                            ntohs(outer_tag->vlan_proto), tags->vlan_id);
2234                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2235                                                 tags->vlan_id);
2236                 if (!skb) {
2237                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2238                         return;
2239                 }
2240
2241                 tags++;
2242         }
2243         /* Set the outer tag */
2244         if (outer_tag->vlan_id) {
2245                 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2246                            ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2247                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2248                                        outer_tag->vlan_id);
2249         }
2250
2251 xmit:
2252         arp_xmit(skb);
2253 }
2254
2255 /* Validate the device path between the @start_dev and the @end_dev.
2256  * The path is valid if the @end_dev is reachable through device
2257  * stacking.
2258  * When the path is validated, collect any vlan information in the
2259  * path.
2260  */
2261 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2262                                               struct net_device *end_dev,
2263                                               int level)
2264 {
2265         struct bond_vlan_tag *tags;
2266         struct net_device *upper;
2267         struct list_head  *iter;
2268
2269         if (start_dev == end_dev) {
2270                 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2271                 if (!tags)
2272                         return ERR_PTR(-ENOMEM);
2273                 tags[level].vlan_proto = VLAN_N_VID;
2274                 return tags;
2275         }
2276
2277         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2278                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2279                 if (IS_ERR_OR_NULL(tags)) {
2280                         if (IS_ERR(tags))
2281                                 return tags;
2282                         continue;
2283                 }
2284                 if (is_vlan_dev(upper)) {
2285                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2286                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2287                 }
2288
2289                 return tags;
2290         }
2291
2292         return NULL;
2293 }
2294
2295 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2296 {
2297         struct rtable *rt;
2298         struct bond_vlan_tag *tags;
2299         __be32 *targets = bond->params.arp_targets, addr;
2300         int i;
2301
2302         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2303                 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2304                 tags = NULL;
2305
2306                 /* Find out through which dev should the packet go */
2307                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2308                                      RTO_ONLINK, 0);
2309                 if (IS_ERR(rt)) {
2310                         /* there's no route to target - try to send arp
2311                          * probe to generate any traffic (arp_validate=0)
2312                          */
2313                         if (bond->params.arp_validate)
2314                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2315                                                      bond->dev->name,
2316                                                      &targets[i]);
2317                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2318                                       0, tags);
2319                         continue;
2320                 }
2321
2322                 /* bond device itself */
2323                 if (rt->dst.dev == bond->dev)
2324                         goto found;
2325
2326                 rcu_read_lock();
2327                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2328                 rcu_read_unlock();
2329
2330                 if (!IS_ERR_OR_NULL(tags))
2331                         goto found;
2332
2333                 /* Not our device - skip */
2334                 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2335                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2336
2337                 ip_rt_put(rt);
2338                 continue;
2339
2340 found:
2341                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2342                 ip_rt_put(rt);
2343                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2344                               addr, tags);
2345                 kfree(tags);
2346         }
2347 }
2348
2349 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2350 {
2351         int i;
2352
2353         if (!sip || !bond_has_this_ip(bond, tip)) {
2354                 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2355                            &sip, &tip);
2356                 return;
2357         }
2358
2359         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2360         if (i == -1) {
2361                 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2362                            &sip);
2363                 return;
2364         }
2365         slave->last_rx = jiffies;
2366         slave->target_last_arp_rx[i] = jiffies;
2367 }
2368
2369 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2370                  struct slave *slave)
2371 {
2372         struct arphdr *arp = (struct arphdr *)skb->data;
2373         struct slave *curr_active_slave;
2374         unsigned char *arp_ptr;
2375         __be32 sip, tip;
2376         int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2377
2378         if (!slave_do_arp_validate(bond, slave)) {
2379                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2380                     !slave_do_arp_validate_only(bond))
2381                         slave->last_rx = jiffies;
2382                 return RX_HANDLER_ANOTHER;
2383         } else if (!is_arp) {
2384                 return RX_HANDLER_ANOTHER;
2385         }
2386
2387         alen = arp_hdr_len(bond->dev);
2388
2389         netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2390                    skb->dev->name);
2391
2392         if (alen > skb_headlen(skb)) {
2393                 arp = kmalloc(alen, GFP_ATOMIC);
2394                 if (!arp)
2395                         goto out_unlock;
2396                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2397                         goto out_unlock;
2398         }
2399
2400         if (arp->ar_hln != bond->dev->addr_len ||
2401             skb->pkt_type == PACKET_OTHERHOST ||
2402             skb->pkt_type == PACKET_LOOPBACK ||
2403             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2404             arp->ar_pro != htons(ETH_P_IP) ||
2405             arp->ar_pln != 4)
2406                 goto out_unlock;
2407
2408         arp_ptr = (unsigned char *)(arp + 1);
2409         arp_ptr += bond->dev->addr_len;
2410         memcpy(&sip, arp_ptr, 4);
2411         arp_ptr += 4 + bond->dev->addr_len;
2412         memcpy(&tip, arp_ptr, 4);
2413
2414         netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2415                    slave->dev->name, bond_slave_state(slave),
2416                      bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2417                      &sip, &tip);
2418
2419         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2420
2421         /* Backup slaves won't see the ARP reply, but do come through
2422          * here for each ARP probe (so we swap the sip/tip to validate
2423          * the probe).  In a "redundant switch, common router" type of
2424          * configuration, the ARP probe will (hopefully) travel from
2425          * the active, through one switch, the router, then the other
2426          * switch before reaching the backup.
2427          *
2428          * We 'trust' the arp requests if there is an active slave and
2429          * it received valid arp reply(s) after it became active. This
2430          * is done to avoid endless looping when we can't reach the
2431          * arp_ip_target and fool ourselves with our own arp requests.
2432          */
2433
2434         if (bond_is_active_slave(slave))
2435                 bond_validate_arp(bond, slave, sip, tip);
2436         else if (curr_active_slave &&
2437                  time_after(slave_last_rx(bond, curr_active_slave),
2438                             curr_active_slave->last_link_up))
2439                 bond_validate_arp(bond, slave, tip, sip);
2440
2441 out_unlock:
2442         if (arp != (struct arphdr *)skb->data)
2443                 kfree(arp);
2444         return RX_HANDLER_ANOTHER;
2445 }
2446
2447 /* function to verify if we're in the arp_interval timeslice, returns true if
2448  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2449  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2450  */
2451 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2452                                   int mod)
2453 {
2454         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2455
2456         return time_in_range(jiffies,
2457                              last_act - delta_in_ticks,
2458                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2459 }
2460
2461 /* This function is called regularly to monitor each slave's link
2462  * ensuring that traffic is being sent and received when arp monitoring
2463  * is used in load-balancing mode. if the adapter has been dormant, then an
2464  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2465  * arp monitoring in active backup mode.
2466  */
2467 static void bond_loadbalance_arp_mon(struct work_struct *work)
2468 {
2469         struct bonding *bond = container_of(work, struct bonding,
2470                                             arp_work.work);
2471         struct slave *slave, *oldcurrent;
2472         struct list_head *iter;
2473         int do_failover = 0, slave_state_changed = 0;
2474
2475         if (!bond_has_slaves(bond))
2476                 goto re_arm;
2477
2478         rcu_read_lock();
2479
2480         oldcurrent = rcu_dereference(bond->curr_active_slave);
2481         /* see if any of the previous devices are up now (i.e. they have
2482          * xmt and rcv traffic). the curr_active_slave does not come into
2483          * the picture unless it is null. also, slave->last_link_up is not
2484          * needed here because we send an arp on each slave and give a slave
2485          * as long as it needs to get the tx/rx within the delta.
2486          * TODO: what about up/down delay in arp mode? it wasn't here before
2487          *       so it can wait
2488          */
2489         bond_for_each_slave_rcu(bond, slave, iter) {
2490                 unsigned long trans_start = dev_trans_start(slave->dev);
2491
2492                 if (slave->link != BOND_LINK_UP) {
2493                         if (bond_time_in_interval(bond, trans_start, 1) &&
2494                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2495
2496                                 slave->link  = BOND_LINK_UP;
2497                                 slave_state_changed = 1;
2498
2499                                 /* primary_slave has no meaning in round-robin
2500                                  * mode. the window of a slave being up and
2501                                  * curr_active_slave being null after enslaving
2502                                  * is closed.
2503                                  */
2504                                 if (!oldcurrent) {
2505                                         netdev_info(bond->dev, "link status definitely up for interface %s\n",
2506                                                     slave->dev->name);
2507                                         do_failover = 1;
2508                                 } else {
2509                                         netdev_info(bond->dev, "interface %s is now up\n",
2510                                                     slave->dev->name);
2511                                 }
2512                         }
2513                 } else {
2514                         /* slave->link == BOND_LINK_UP */
2515
2516                         /* not all switches will respond to an arp request
2517                          * when the source ip is 0, so don't take the link down
2518                          * if we don't know our ip yet
2519                          */
2520                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2521                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2522
2523                                 slave->link  = BOND_LINK_DOWN;
2524                                 slave_state_changed = 1;
2525
2526                                 if (slave->link_failure_count < UINT_MAX)
2527                                         slave->link_failure_count++;
2528
2529                                 netdev_info(bond->dev, "interface %s is now down\n",
2530                                             slave->dev->name);
2531
2532                                 if (slave == oldcurrent)
2533                                         do_failover = 1;
2534                         }
2535                 }
2536
2537                 /* note: if switch is in round-robin mode, all links
2538                  * must tx arp to ensure all links rx an arp - otherwise
2539                  * links may oscillate or not come up at all; if switch is
2540                  * in something like xor mode, there is nothing we can
2541                  * do - all replies will be rx'ed on same link causing slaves
2542                  * to be unstable during low/no traffic periods
2543                  */
2544                 if (bond_slave_is_up(slave))
2545                         bond_arp_send_all(bond, slave);
2546         }
2547
2548         rcu_read_unlock();
2549
2550         if (do_failover || slave_state_changed) {
2551                 if (!rtnl_trylock())
2552                         goto re_arm;
2553
2554                 if (slave_state_changed) {
2555                         bond_slave_state_change(bond);
2556                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2557                                 bond_update_slave_arr(bond, NULL);
2558                 }
2559                 if (do_failover) {
2560                         block_netpoll_tx();
2561                         bond_select_active_slave(bond);
2562                         unblock_netpoll_tx();
2563                 }
2564                 rtnl_unlock();
2565         }
2566
2567 re_arm:
2568         if (bond->params.arp_interval)
2569                 queue_delayed_work(bond->wq, &bond->arp_work,
2570                                    msecs_to_jiffies(bond->params.arp_interval));
2571 }
2572
2573 /* Called to inspect slaves for active-backup mode ARP monitor link state
2574  * changes.  Sets new_link in slaves to specify what action should take
2575  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2576  * to link states must be committed.
2577  *
2578  * Called with rcu_read_lock held.
2579  */
2580 static int bond_ab_arp_inspect(struct bonding *bond)
2581 {
2582         unsigned long trans_start, last_rx;
2583         struct list_head *iter;
2584         struct slave *slave;
2585         int commit = 0;
2586
2587         bond_for_each_slave_rcu(bond, slave, iter) {
2588                 slave->new_link = BOND_LINK_NOCHANGE;
2589                 last_rx = slave_last_rx(bond, slave);
2590
2591                 if (slave->link != BOND_LINK_UP) {
2592                         if (bond_time_in_interval(bond, last_rx, 1)) {
2593                                 slave->new_link = BOND_LINK_UP;
2594                                 commit++;
2595                         }
2596                         continue;
2597                 }
2598
2599                 /* Give slaves 2*delta after being enslaved or made
2600                  * active.  This avoids bouncing, as the last receive
2601                  * times need a full ARP monitor cycle to be updated.
2602                  */
2603                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2604                         continue;
2605
2606                 /* Backup slave is down if:
2607                  * - No current_arp_slave AND
2608                  * - more than 3*delta since last receive AND
2609                  * - the bond has an IP address
2610                  *
2611                  * Note: a non-null current_arp_slave indicates
2612                  * the curr_active_slave went down and we are
2613                  * searching for a new one; under this condition
2614                  * we only take the curr_active_slave down - this
2615                  * gives each slave a chance to tx/rx traffic
2616                  * before being taken out
2617                  */
2618                 if (!bond_is_active_slave(slave) &&
2619                     !rcu_access_pointer(bond->current_arp_slave) &&
2620                     !bond_time_in_interval(bond, last_rx, 3)) {
2621                         slave->new_link = BOND_LINK_DOWN;
2622                         commit++;
2623                 }
2624
2625                 /* Active slave is down if:
2626                  * - more than 2*delta since transmitting OR
2627                  * - (more than 2*delta since receive AND
2628                  *    the bond has an IP address)
2629                  */
2630                 trans_start = dev_trans_start(slave->dev);
2631                 if (bond_is_active_slave(slave) &&
2632                     (!bond_time_in_interval(bond, trans_start, 2) ||
2633                      !bond_time_in_interval(bond, last_rx, 2))) {
2634                         slave->new_link = BOND_LINK_DOWN;
2635                         commit++;
2636                 }
2637         }
2638
2639         return commit;
2640 }
2641
2642 /* Called to commit link state changes noted by inspection step of
2643  * active-backup mode ARP monitor.
2644  *
2645  * Called with RTNL hold.
2646  */
2647 static void bond_ab_arp_commit(struct bonding *bond)
2648 {
2649         unsigned long trans_start;
2650         struct list_head *iter;
2651         struct slave *slave;
2652
2653         bond_for_each_slave(bond, slave, iter) {
2654                 switch (slave->new_link) {
2655                 case BOND_LINK_NOCHANGE:
2656                         continue;
2657
2658                 case BOND_LINK_UP:
2659                         trans_start = dev_trans_start(slave->dev);
2660                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2661                             (!rtnl_dereference(bond->curr_active_slave) &&
2662                              bond_time_in_interval(bond, trans_start, 1))) {
2663                                 struct slave *current_arp_slave;
2664
2665                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2666                                 bond_set_slave_link_state(slave, BOND_LINK_UP);
2667                                 if (current_arp_slave) {
2668                                         bond_set_slave_inactive_flags(
2669                                                 current_arp_slave,
2670                                                 BOND_SLAVE_NOTIFY_NOW);
2671                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2672                                 }
2673
2674                                 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2675                                             slave->dev->name);
2676
2677                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2678                                     slave == rtnl_dereference(bond->primary_slave))
2679                                         goto do_failover;
2680
2681                         }
2682
2683                         continue;
2684
2685                 case BOND_LINK_DOWN:
2686                         if (slave->link_failure_count < UINT_MAX)
2687                                 slave->link_failure_count++;
2688
2689                         bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2690                         bond_set_slave_inactive_flags(slave,
2691                                                       BOND_SLAVE_NOTIFY_NOW);
2692
2693                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2694                                     slave->dev->name);
2695
2696                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2697                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2698                                 goto do_failover;
2699                         }
2700
2701                         continue;
2702
2703                 default:
2704                         netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2705                                    slave->new_link, slave->dev->name);
2706                         continue;
2707                 }
2708
2709 do_failover:
2710                 block_netpoll_tx();
2711                 bond_select_active_slave(bond);
2712                 unblock_netpoll_tx();
2713         }
2714
2715         bond_set_carrier(bond);
2716 }
2717
2718 /* Send ARP probes for active-backup mode ARP monitor.
2719  *
2720  * Called with rcu_read_lock held.
2721  */
2722 static bool bond_ab_arp_probe(struct bonding *bond)
2723 {
2724         struct slave *slave, *before = NULL, *new_slave = NULL,
2725                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2726                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2727         struct list_head *iter;
2728         bool found = false;
2729         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2730
2731         if (curr_arp_slave && curr_active_slave)
2732                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2733                             curr_arp_slave->dev->name,
2734                             curr_active_slave->dev->name);
2735
2736         if (curr_active_slave) {
2737                 bond_arp_send_all(bond, curr_active_slave);
2738                 return should_notify_rtnl;
2739         }
2740
2741         /* if we don't have a curr_active_slave, search for the next available
2742          * backup slave from the current_arp_slave and make it the candidate
2743          * for becoming the curr_active_slave
2744          */
2745
2746         if (!curr_arp_slave) {
2747                 curr_arp_slave = bond_first_slave_rcu(bond);
2748                 if (!curr_arp_slave)
2749                         return should_notify_rtnl;
2750         }
2751
2752         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2753
2754         bond_for_each_slave_rcu(bond, slave, iter) {
2755                 if (!found && !before && bond_slave_is_up(slave))
2756                         before = slave;
2757
2758                 if (found && !new_slave && bond_slave_is_up(slave))
2759                         new_slave = slave;
2760                 /* if the link state is up at this point, we
2761                  * mark it down - this can happen if we have
2762                  * simultaneous link failures and
2763                  * reselect_active_interface doesn't make this
2764                  * one the current slave so it is still marked
2765                  * up when it is actually down
2766                  */
2767                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2768                         bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2769                         if (slave->link_failure_count < UINT_MAX)
2770                                 slave->link_failure_count++;
2771
2772                         bond_set_slave_inactive_flags(slave,
2773                                                       BOND_SLAVE_NOTIFY_LATER);
2774
2775                         netdev_info(bond->dev, "backup interface %s is now down\n",
2776                                     slave->dev->name);
2777                 }
2778                 if (slave == curr_arp_slave)
2779                         found = true;
2780         }
2781
2782         if (!new_slave && before)
2783                 new_slave = before;
2784
2785         if (!new_slave)
2786                 goto check_state;
2787
2788         bond_set_slave_link_state(new_slave, BOND_LINK_BACK);
2789         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2790         bond_arp_send_all(bond, new_slave);
2791         new_slave->last_link_up = jiffies;
2792         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2793
2794 check_state:
2795         bond_for_each_slave_rcu(bond, slave, iter) {
2796                 if (slave->should_notify) {
2797                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2798                         break;
2799                 }
2800         }
2801         return should_notify_rtnl;
2802 }
2803
2804 static void bond_activebackup_arp_mon(struct work_struct *work)
2805 {
2806         struct bonding *bond = container_of(work, struct bonding,
2807                                             arp_work.work);
2808         bool should_notify_peers = false;
2809         bool should_notify_rtnl = false;
2810         int delta_in_ticks;
2811
2812         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2813
2814         if (!bond_has_slaves(bond))
2815                 goto re_arm;
2816
2817         rcu_read_lock();
2818
2819         should_notify_peers = bond_should_notify_peers(bond);
2820
2821         if (bond_ab_arp_inspect(bond)) {
2822                 rcu_read_unlock();
2823
2824                 /* Race avoidance with bond_close flush of workqueue */
2825                 if (!rtnl_trylock()) {
2826                         delta_in_ticks = 1;
2827                         should_notify_peers = false;
2828                         goto re_arm;
2829                 }
2830
2831                 bond_ab_arp_commit(bond);
2832
2833                 rtnl_unlock();
2834                 rcu_read_lock();
2835         }
2836
2837         should_notify_rtnl = bond_ab_arp_probe(bond);
2838         rcu_read_unlock();
2839
2840 re_arm:
2841         if (bond->params.arp_interval)
2842                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2843
2844         if (should_notify_peers || should_notify_rtnl) {
2845                 if (!rtnl_trylock())
2846                         return;
2847
2848                 if (should_notify_peers)
2849                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2850                                                  bond->dev);
2851                 if (should_notify_rtnl)
2852                         bond_slave_state_notify(bond);
2853
2854                 rtnl_unlock();
2855         }
2856 }
2857
2858 /*-------------------------- netdev event handling --------------------------*/
2859
2860 /* Change device name */
2861 static int bond_event_changename(struct bonding *bond)
2862 {
2863         bond_remove_proc_entry(bond);
2864         bond_create_proc_entry(bond);
2865
2866         bond_debug_reregister(bond);
2867
2868         return NOTIFY_DONE;
2869 }
2870
2871 static int bond_master_netdev_event(unsigned long event,
2872                                     struct net_device *bond_dev)
2873 {
2874         struct bonding *event_bond = netdev_priv(bond_dev);
2875
2876         switch (event) {
2877         case NETDEV_CHANGENAME:
2878                 return bond_event_changename(event_bond);
2879         case NETDEV_UNREGISTER:
2880                 bond_remove_proc_entry(event_bond);
2881                 break;
2882         case NETDEV_REGISTER:
2883                 bond_create_proc_entry(event_bond);
2884                 break;
2885         case NETDEV_NOTIFY_PEERS:
2886                 if (event_bond->send_peer_notif)
2887                         event_bond->send_peer_notif--;
2888                 break;
2889         default:
2890                 break;
2891         }
2892
2893         return NOTIFY_DONE;
2894 }
2895
2896 static int bond_slave_netdev_event(unsigned long event,
2897                                    struct net_device *slave_dev)
2898 {
2899         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2900         struct bonding *bond;
2901         struct net_device *bond_dev;
2902         u32 old_speed;
2903         u8 old_duplex;
2904
2905         /* A netdev event can be generated while enslaving a device
2906          * before netdev_rx_handler_register is called in which case
2907          * slave will be NULL
2908          */
2909         if (!slave)
2910                 return NOTIFY_DONE;
2911         bond_dev = slave->bond->dev;
2912         bond = slave->bond;
2913         primary = rtnl_dereference(bond->primary_slave);
2914
2915         switch (event) {
2916         case NETDEV_UNREGISTER:
2917                 if (bond_dev->type != ARPHRD_ETHER)
2918                         bond_release_and_destroy(bond_dev, slave_dev);
2919                 else
2920                         bond_release(bond_dev, slave_dev);
2921                 break;
2922         case NETDEV_UP:
2923         case NETDEV_CHANGE:
2924                 old_speed = slave->speed;
2925                 old_duplex = slave->duplex;
2926
2927                 bond_update_speed_duplex(slave);
2928
2929                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2930                         if (old_speed != slave->speed)
2931                                 bond_3ad_adapter_speed_changed(slave);
2932                         if (old_duplex != slave->duplex)
2933                                 bond_3ad_adapter_duplex_changed(slave);
2934                 }
2935                 /* Fallthrough */
2936         case NETDEV_DOWN:
2937                 /* Refresh slave-array if applicable!
2938                  * If the setup does not use miimon or arpmon (mode-specific!),
2939                  * then these events will not cause the slave-array to be
2940                  * refreshed. This will cause xmit to use a slave that is not
2941                  * usable. Avoid such situation by refeshing the array at these
2942                  * events. If these (miimon/arpmon) parameters are configured
2943                  * then array gets refreshed twice and that should be fine!
2944                  */
2945                 if (bond_mode_uses_xmit_hash(bond))
2946                         bond_update_slave_arr(bond, NULL);
2947                 break;
2948         case NETDEV_CHANGEMTU:
2949                 /* TODO: Should slaves be allowed to
2950                  * independently alter their MTU?  For
2951                  * an active-backup bond, slaves need
2952                  * not be the same type of device, so
2953                  * MTUs may vary.  For other modes,
2954                  * slaves arguably should have the
2955                  * same MTUs. To do this, we'd need to
2956                  * take over the slave's change_mtu
2957                  * function for the duration of their
2958                  * servitude.
2959                  */
2960                 break;
2961         case NETDEV_CHANGENAME:
2962                 /* we don't care if we don't have primary set */
2963                 if (!bond_uses_primary(bond) ||
2964                     !bond->params.primary[0])
2965                         break;
2966
2967                 if (slave == primary) {
2968                         /* slave's name changed - he's no longer primary */
2969                         RCU_INIT_POINTER(bond->primary_slave, NULL);
2970                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2971                         /* we have a new primary slave */
2972                         rcu_assign_pointer(bond->primary_slave, slave);
2973                 } else { /* we didn't change primary - exit */
2974                         break;
2975                 }
2976
2977                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
2978                             primary ? slave_dev->name : "none");
2979
2980                 block_netpoll_tx();
2981                 bond_select_active_slave(bond);
2982                 unblock_netpoll_tx();
2983                 break;
2984         case NETDEV_FEAT_CHANGE:
2985                 bond_compute_features(bond);
2986                 break;
2987         case NETDEV_RESEND_IGMP:
2988                 /* Propagate to master device */
2989                 call_netdevice_notifiers(event, slave->bond->dev);
2990                 break;
2991         default:
2992                 break;
2993         }
2994
2995         return NOTIFY_DONE;
2996 }
2997
2998 /* bond_netdev_event: handle netdev notifier chain events.
2999  *
3000  * This function receives events for the netdev chain.  The caller (an
3001  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3002  * locks for us to safely manipulate the slave devices (RTNL lock,
3003  * dev_probe_lock).
3004  */
3005 static int bond_netdev_event(struct notifier_block *this,
3006                              unsigned long event, void *ptr)
3007 {
3008         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3009
3010         netdev_dbg(event_dev, "event: %lx\n", event);
3011
3012         if (!(event_dev->priv_flags & IFF_BONDING))
3013                 return NOTIFY_DONE;
3014
3015         if (event_dev->flags & IFF_MASTER) {
3016                 netdev_dbg(event_dev, "IFF_MASTER\n");
3017                 return bond_master_netdev_event(event, event_dev);
3018         }
3019
3020         if (event_dev->flags & IFF_SLAVE) {
3021                 netdev_dbg(event_dev, "IFF_SLAVE\n");
3022                 return bond_slave_netdev_event(event, event_dev);
3023         }
3024
3025         return NOTIFY_DONE;
3026 }
3027
3028 static struct notifier_block bond_netdev_notifier = {
3029         .notifier_call = bond_netdev_event,
3030 };
3031
3032 /*---------------------------- Hashing Policies -----------------------------*/
3033
3034 /* L2 hash helper */
3035 static inline u32 bond_eth_hash(struct sk_buff *skb)
3036 {
3037         struct ethhdr *ep, hdr_tmp;
3038
3039         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3040         if (ep)
3041                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3042         return 0;
3043 }
3044
3045 /* Extract the appropriate headers based on bond's xmit policy */
3046 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3047                               struct flow_keys *fk)
3048 {
3049         const struct ipv6hdr *iph6;
3050         const struct iphdr *iph;
3051         int noff, proto = -1;
3052
3053         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3054                 return skb_flow_dissect_flow_keys(skb, fk);
3055
3056         fk->ports.ports = 0;
3057         noff = skb_network_offset(skb);
3058         if (skb->protocol == htons(ETH_P_IP)) {
3059                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3060                         return false;
3061                 iph = ip_hdr(skb);
3062                 iph_to_flow_copy_v4addrs(fk, iph);
3063                 noff += iph->ihl << 2;
3064                 if (!ip_is_fragment(iph))
3065                         proto = iph->protocol;
3066         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3067                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3068                         return false;
3069                 iph6 = ipv6_hdr(skb);
3070                 iph_to_flow_copy_v6addrs(fk, iph6);
3071                 noff += sizeof(*iph6);
3072                 proto = iph6->nexthdr;
3073         } else {
3074                 return false;
3075         }
3076         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3077                 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3078
3079         return true;
3080 }
3081
3082 /**
3083  * bond_xmit_hash - generate a hash value based on the xmit policy
3084  * @bond: bonding device
3085  * @skb: buffer to use for headers
3086  *
3087  * This function will extract the necessary headers from the skb buffer and use
3088  * them to generate a hash based on the xmit_policy set in the bonding device
3089  */
3090 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3091 {
3092         struct flow_keys flow;
3093         u32 hash;
3094
3095         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3096             !bond_flow_dissect(bond, skb, &flow))
3097                 return bond_eth_hash(skb);
3098
3099         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3100             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3101                 hash = bond_eth_hash(skb);
3102         else
3103                 hash = (__force u32)flow.ports.ports;
3104         hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3105                 (__force u32)flow_get_u32_src(&flow);
3106         hash ^= (hash >> 16);
3107         hash ^= (hash >> 8);
3108
3109         return hash;
3110 }
3111
3112 /*-------------------------- Device entry points ----------------------------*/
3113
3114 static void bond_work_init_all(struct bonding *bond)
3115 {
3116         INIT_DELAYED_WORK(&bond->mcast_work,
3117                           bond_resend_igmp_join_requests_delayed);
3118         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3119         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3120         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3121                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3122         else
3123                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3124         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3125         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3126 }
3127
3128 static void bond_work_cancel_all(struct bonding *bond)
3129 {
3130         cancel_delayed_work_sync(&bond->mii_work);
3131         cancel_delayed_work_sync(&bond->arp_work);
3132         cancel_delayed_work_sync(&bond->alb_work);
3133         cancel_delayed_work_sync(&bond->ad_work);
3134         cancel_delayed_work_sync(&bond->mcast_work);
3135         cancel_delayed_work_sync(&bond->slave_arr_work);
3136 }
3137
3138 static int bond_open(struct net_device *bond_dev)
3139 {
3140         struct bonding *bond = netdev_priv(bond_dev);
3141         struct list_head *iter;
3142         struct slave *slave;
3143
3144         /* reset slave->backup and slave->inactive */
3145         if (bond_has_slaves(bond)) {
3146                 bond_for_each_slave(bond, slave, iter) {
3147                         if (bond_uses_primary(bond) &&
3148                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3149                                 bond_set_slave_inactive_flags(slave,
3150                                                               BOND_SLAVE_NOTIFY_NOW);
3151                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3152                                 bond_set_slave_active_flags(slave,
3153                                                             BOND_SLAVE_NOTIFY_NOW);
3154                         }
3155                 }
3156         }
3157
3158         bond_work_init_all(bond);
3159
3160         if (bond_is_lb(bond)) {
3161                 /* bond_alb_initialize must be called before the timer
3162                  * is started.
3163                  */
3164                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3165                         return -ENOMEM;
3166                 if (bond->params.tlb_dynamic_lb)
3167                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3168         }
3169
3170         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3171                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3172
3173         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3174                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3175                 bond->recv_probe = bond_arp_rcv;
3176         }
3177
3178         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3179                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3180                 /* register to receive LACPDUs */
3181                 bond->recv_probe = bond_3ad_lacpdu_recv;
3182                 bond_3ad_initiate_agg_selection(bond, 1);
3183         }
3184
3185         if (bond_mode_uses_xmit_hash(bond))
3186                 bond_update_slave_arr(bond, NULL);
3187
3188         return 0;
3189 }
3190
3191 static int bond_close(struct net_device *bond_dev)
3192 {
3193         struct bonding *bond = netdev_priv(bond_dev);
3194
3195         bond_work_cancel_all(bond);
3196         bond->send_peer_notif = 0;
3197         if (bond_is_lb(bond))
3198                 bond_alb_deinitialize(bond);
3199         bond->recv_probe = NULL;
3200
3201         return 0;
3202 }
3203
3204 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3205                                                 struct rtnl_link_stats64 *stats)
3206 {
3207         struct bonding *bond = netdev_priv(bond_dev);
3208         struct rtnl_link_stats64 temp;
3209         struct list_head *iter;
3210         struct slave *slave;
3211
3212         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3213
3214         bond_for_each_slave(bond, slave, iter) {
3215                 const struct rtnl_link_stats64 *sstats =
3216                         dev_get_stats(slave->dev, &temp);
3217                 struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3218
3219                 stats->rx_packets +=  sstats->rx_packets - pstats->rx_packets;
3220                 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3221                 stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3222                 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3223
3224                 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3225                 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3226                 stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3227                 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3228
3229                 stats->multicast += sstats->multicast - pstats->multicast;
3230                 stats->collisions += sstats->collisions - pstats->collisions;
3231
3232                 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3233                 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3234                 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3235                 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3236                 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3237                 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3238
3239                 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3240                 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3241                 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3242                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3243                 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3244
3245                 /* save off the slave stats for the next run */
3246                 memcpy(pstats, sstats, sizeof(*sstats));
3247         }
3248         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3249
3250         return stats;
3251 }
3252
3253 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3254 {
3255         struct bonding *bond = netdev_priv(bond_dev);
3256         struct net_device *slave_dev = NULL;
3257         struct ifbond k_binfo;
3258         struct ifbond __user *u_binfo = NULL;
3259         struct ifslave k_sinfo;
3260         struct ifslave __user *u_sinfo = NULL;
3261         struct mii_ioctl_data *mii = NULL;
3262         struct bond_opt_value newval;
3263         struct net *net;
3264         int res = 0;
3265
3266         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3267
3268         switch (cmd) {
3269         case SIOCGMIIPHY:
3270                 mii = if_mii(ifr);
3271                 if (!mii)
3272                         return -EINVAL;
3273
3274                 mii->phy_id = 0;
3275                 /* Fall Through */
3276         case SIOCGMIIREG:
3277                 /* We do this again just in case we were called by SIOCGMIIREG
3278                  * instead of SIOCGMIIPHY.
3279                  */
3280                 mii = if_mii(ifr);
3281                 if (!mii)
3282                         return -EINVAL;
3283
3284                 if (mii->reg_num == 1) {
3285                         mii->val_out = 0;
3286                         if (netif_carrier_ok(bond->dev))
3287                                 mii->val_out = BMSR_LSTATUS;
3288                 }
3289
3290                 return 0;
3291         case BOND_INFO_QUERY_OLD:
3292         case SIOCBONDINFOQUERY:
3293                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3294
3295                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3296                         return -EFAULT;
3297
3298                 res = bond_info_query(bond_dev, &k_binfo);
3299                 if (res == 0 &&
3300                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3301                         return -EFAULT;
3302
3303                 return res;
3304         case BOND_SLAVE_INFO_QUERY_OLD:
3305         case SIOCBONDSLAVEINFOQUERY:
3306                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3307
3308                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3309                         return -EFAULT;
3310
3311                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3312                 if (res == 0 &&
3313                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3314                         return -EFAULT;
3315
3316                 return res;
3317         default:
3318                 break;
3319         }
3320
3321         net = dev_net(bond_dev);
3322
3323         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3324                 return -EPERM;
3325
3326         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3327
3328         netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3329
3330         if (!slave_dev)
3331                 return -ENODEV;
3332
3333         netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3334         switch (cmd) {
3335         case BOND_ENSLAVE_OLD:
3336         case SIOCBONDENSLAVE:
3337                 res = bond_enslave(bond_dev, slave_dev);
3338                 break;
3339         case BOND_RELEASE_OLD:
3340         case SIOCBONDRELEASE:
3341                 res = bond_release(bond_dev, slave_dev);
3342                 break;
3343         case BOND_SETHWADDR_OLD:
3344         case SIOCBONDSETHWADDR:
3345                 bond_set_dev_addr(bond_dev, slave_dev);
3346                 res = 0;
3347                 break;
3348         case BOND_CHANGE_ACTIVE_OLD:
3349         case SIOCBONDCHANGEACTIVE:
3350                 bond_opt_initstr(&newval, slave_dev->name);
3351                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3352                 break;
3353         default:
3354                 res = -EOPNOTSUPP;
3355         }
3356
3357         return res;
3358 }
3359
3360 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3361 {
3362         struct bonding *bond = netdev_priv(bond_dev);
3363
3364         if (change & IFF_PROMISC)
3365                 bond_set_promiscuity(bond,
3366                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3367
3368         if (change & IFF_ALLMULTI)
3369                 bond_set_allmulti(bond,
3370                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3371 }
3372
3373 static void bond_set_rx_mode(struct net_device *bond_dev)
3374 {
3375         struct bonding *bond = netdev_priv(bond_dev);
3376         struct list_head *iter;
3377         struct slave *slave;
3378
3379         rcu_read_lock();
3380         if (bond_uses_primary(bond)) {
3381                 slave = rcu_dereference(bond->curr_active_slave);
3382                 if (slave) {
3383                         dev_uc_sync(slave->dev, bond_dev);
3384                         dev_mc_sync(slave->dev, bond_dev);
3385                 }
3386         } else {
3387                 bond_for_each_slave_rcu(bond, slave, iter) {
3388                         dev_uc_sync_multiple(slave->dev, bond_dev);
3389                         dev_mc_sync_multiple(slave->dev, bond_dev);
3390                 }
3391         }
3392         rcu_read_unlock();
3393 }
3394
3395 static int bond_neigh_init(struct neighbour *n)
3396 {
3397         struct bonding *bond = netdev_priv(n->dev);
3398         const struct net_device_ops *slave_ops;
3399         struct neigh_parms parms;
3400         struct slave *slave;
3401         int ret;
3402
3403         slave = bond_first_slave(bond);
3404         if (!slave)
3405                 return 0;
3406         slave_ops = slave->dev->netdev_ops;
3407         if (!slave_ops->ndo_neigh_setup)
3408                 return 0;
3409
3410         parms.neigh_setup = NULL;
3411         parms.neigh_cleanup = NULL;
3412         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3413         if (ret)
3414                 return ret;
3415
3416         /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3417          * after the last slave has been detached.  Assumes that all slaves
3418          * utilize the same neigh_cleanup (true at this writing as only user
3419          * is ipoib).
3420          */
3421         n->parms->neigh_cleanup = parms.neigh_cleanup;
3422
3423         if (!parms.neigh_setup)
3424                 return 0;
3425
3426         return parms.neigh_setup(n);
3427 }
3428
3429 /* The bonding ndo_neigh_setup is called at init time beofre any
3430  * slave exists. So we must declare proxy setup function which will
3431  * be used at run time to resolve the actual slave neigh param setup.
3432  *
3433  * It's also called by master devices (such as vlans) to setup their
3434  * underlying devices. In that case - do nothing, we're already set up from
3435  * our init.
3436  */
3437 static int bond_neigh_setup(struct net_device *dev,
3438                             struct neigh_parms *parms)
3439 {
3440         /* modify only our neigh_parms */
3441         if (parms->dev == dev)
3442                 parms->neigh_setup = bond_neigh_init;
3443
3444         return 0;
3445 }
3446
3447 /* Change the MTU of all of a master's slaves to match the master */
3448 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3449 {
3450         struct bonding *bond = netdev_priv(bond_dev);
3451         struct slave *slave, *rollback_slave;
3452         struct list_head *iter;
3453         int res = 0;
3454
3455         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3456
3457         bond_for_each_slave(bond, slave, iter) {
3458                 netdev_dbg(bond_dev, "s %p c_m %p\n",
3459                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3460
3461                 res = dev_set_mtu(slave->dev, new_mtu);
3462
3463                 if (res) {
3464                         /* If we failed to set the slave's mtu to the new value
3465                          * we must abort the operation even in ACTIVE_BACKUP
3466                          * mode, because if we allow the backup slaves to have
3467                          * different mtu values than the active slave we'll
3468                          * need to change their mtu when doing a failover. That
3469                          * means changing their mtu from timer context, which
3470                          * is probably not a good idea.
3471                          */
3472                         netdev_dbg(bond_dev, "err %d %s\n", res,
3473                                    slave->dev->name);
3474                         goto unwind;
3475                 }
3476         }
3477
3478         bond_dev->mtu = new_mtu;
3479
3480         return 0;
3481
3482 unwind:
3483         /* unwind from head to the slave that failed */
3484         bond_for_each_slave(bond, rollback_slave, iter) {
3485                 int tmp_res;
3486
3487                 if (rollback_slave == slave)
3488                         break;
3489
3490                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3491                 if (tmp_res) {
3492                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3493                                    tmp_res, rollback_slave->dev->name);
3494                 }
3495         }
3496
3497         return res;
3498 }
3499
3500 /* Change HW address
3501  *
3502  * Note that many devices must be down to change the HW address, and
3503  * downing the master releases all slaves.  We can make bonds full of
3504  * bonding devices to test this, however.
3505  */
3506 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3507 {
3508         struct bonding *bond = netdev_priv(bond_dev);
3509         struct slave *slave, *rollback_slave;
3510         struct sockaddr *sa = addr, tmp_sa;
3511         struct list_head *iter;
3512         int res = 0;
3513
3514         if (BOND_MODE(bond) == BOND_MODE_ALB)
3515                 return bond_alb_set_mac_address(bond_dev, addr);
3516
3517
3518         netdev_dbg(bond_dev, "bond=%p\n", bond);
3519
3520         /* If fail_over_mac is enabled, do nothing and return success.
3521          * Returning an error causes ifenslave to fail.
3522          */
3523         if (bond->params.fail_over_mac &&
3524             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3525                 return 0;
3526
3527         if (!is_valid_ether_addr(sa->sa_data))
3528                 return -EADDRNOTAVAIL;
3529
3530         bond_for_each_slave(bond, slave, iter) {
3531                 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3532                 res = dev_set_mac_address(slave->dev, addr);
3533                 if (res) {
3534                         /* TODO: consider downing the slave
3535                          * and retry ?
3536                          * User should expect communications
3537                          * breakage anyway until ARP finish
3538                          * updating, so...
3539                          */
3540                         netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3541                         goto unwind;
3542                 }
3543         }
3544
3545         /* success */
3546         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3547         return 0;
3548
3549 unwind:
3550         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3551         tmp_sa.sa_family = bond_dev->type;
3552
3553         /* unwind from head to the slave that failed */
3554         bond_for_each_slave(bond, rollback_slave, iter) {
3555                 int tmp_res;
3556
3557                 if (rollback_slave == slave)
3558                         break;
3559
3560                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3561                 if (tmp_res) {
3562                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3563                                    tmp_res, rollback_slave->dev->name);
3564                 }
3565         }
3566
3567         return res;
3568 }
3569
3570 /**
3571  * bond_xmit_slave_id - transmit skb through slave with slave_id
3572  * @bond: bonding device that is transmitting
3573  * @skb: buffer to transmit
3574  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3575  *
3576  * This function tries to transmit through slave with slave_id but in case
3577  * it fails, it tries to find the first available slave for transmission.
3578  * The skb is consumed in all cases, thus the function is void.
3579  */
3580 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3581 {
3582         struct list_head *iter;
3583         struct slave *slave;
3584         int i = slave_id;
3585
3586         /* Here we start from the slave with slave_id */
3587         bond_for_each_slave_rcu(bond, slave, iter) {
3588                 if (--i < 0) {
3589                         if (bond_slave_can_tx(slave)) {
3590                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3591                                 return;
3592                         }
3593                 }
3594         }
3595
3596         /* Here we start from the first slave up to slave_id */
3597         i = slave_id;
3598         bond_for_each_slave_rcu(bond, slave, iter) {
3599                 if (--i < 0)
3600                         break;
3601                 if (bond_slave_can_tx(slave)) {
3602                         bond_dev_queue_xmit(bond, skb, slave->dev);
3603                         return;
3604                 }
3605         }
3606         /* no slave that can tx has been found */
3607         bond_tx_drop(bond->dev, skb);
3608 }
3609
3610 /**
3611  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3612  * @bond: bonding device to use
3613  *
3614  * Based on the value of the bonding device's packets_per_slave parameter
3615  * this function generates a slave id, which is usually used as the next
3616  * slave to transmit through.
3617  */
3618 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3619 {
3620         u32 slave_id;
3621         struct reciprocal_value reciprocal_packets_per_slave;
3622         int packets_per_slave = bond->params.packets_per_slave;
3623
3624         switch (packets_per_slave) {
3625         case 0:
3626                 slave_id = prandom_u32();
3627                 break;
3628         case 1:
3629                 slave_id = bond->rr_tx_counter;
3630                 break;
3631         default:
3632                 reciprocal_packets_per_slave =
3633                         bond->params.reciprocal_packets_per_slave;
3634                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3635                                              reciprocal_packets_per_slave);
3636                 break;
3637         }
3638         bond->rr_tx_counter++;
3639
3640         return slave_id;
3641 }
3642
3643 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3644 {
3645         struct bonding *bond = netdev_priv(bond_dev);
3646         struct iphdr *iph = ip_hdr(skb);
3647         struct slave *slave;
3648         u32 slave_id;
3649
3650         /* Start with the curr_active_slave that joined the bond as the
3651          * default for sending IGMP traffic.  For failover purposes one
3652          * needs to maintain some consistency for the interface that will
3653          * send the join/membership reports.  The curr_active_slave found
3654          * will send all of this type of traffic.
3655          */
3656         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3657                 slave = rcu_dereference(bond->curr_active_slave);
3658                 if (slave)
3659                         bond_dev_queue_xmit(bond, skb, slave->dev);
3660                 else
3661                         bond_xmit_slave_id(bond, skb, 0);
3662         } else {
3663                 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3664
3665                 if (likely(slave_cnt)) {
3666                         slave_id = bond_rr_gen_slave_id(bond);
3667                         bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3668                 } else {
3669                         bond_tx_drop(bond_dev, skb);
3670                 }
3671         }
3672
3673         return NETDEV_TX_OK;
3674 }
3675
3676 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3677  * the bond has a usable interface.
3678  */
3679 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3680 {
3681         struct bonding *bond = netdev_priv(bond_dev);
3682         struct slave *slave;
3683
3684         slave = rcu_dereference(bond->curr_active_slave);
3685         if (slave)
3686                 bond_dev_queue_xmit(bond, skb, slave->dev);
3687         else
3688                 bond_tx_drop(bond_dev, skb);
3689
3690         return NETDEV_TX_OK;
3691 }
3692
3693 /* Use this to update slave_array when (a) it's not appropriate to update
3694  * slave_array right away (note that update_slave_array() may sleep)
3695  * and / or (b) RTNL is not held.
3696  */
3697 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3698 {
3699         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3700 }
3701
3702 /* Slave array work handler. Holds only RTNL */
3703 static void bond_slave_arr_handler(struct work_struct *work)
3704 {
3705         struct bonding *bond = container_of(work, struct bonding,
3706                                             slave_arr_work.work);
3707         int ret;
3708
3709         if (!rtnl_trylock())
3710                 goto err;
3711
3712         ret = bond_update_slave_arr(bond, NULL);
3713         rtnl_unlock();
3714         if (ret) {
3715                 pr_warn_ratelimited("Failed to update slave array from WT\n");
3716                 goto err;
3717         }
3718         return;
3719
3720 err:
3721         bond_slave_arr_work_rearm(bond, 1);
3722 }
3723
3724 /* Build the usable slaves array in control path for modes that use xmit-hash
3725  * to determine the slave interface -
3726  * (a) BOND_MODE_8023AD
3727  * (b) BOND_MODE_XOR
3728  * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3729  *
3730  * The caller is expected to hold RTNL only and NO other lock!
3731  */
3732 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3733 {
3734         struct slave *slave;
3735         struct list_head *iter;
3736         struct bond_up_slave *new_arr, *old_arr;
3737         int slaves_in_agg;
3738         int agg_id = 0;
3739         int ret = 0;
3740
3741 #ifdef CONFIG_LOCKDEP
3742         WARN_ON(lockdep_is_held(&bond->mode_lock));
3743 #endif
3744
3745         new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3746                           GFP_KERNEL);
3747         if (!new_arr) {
3748                 ret = -ENOMEM;
3749                 pr_err("Failed to build slave-array.\n");
3750                 goto out;
3751         }
3752         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3753                 struct ad_info ad_info;
3754
3755                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3756                         pr_debug("bond_3ad_get_active_agg_info failed\n");
3757                         kfree_rcu(new_arr, rcu);
3758                         /* No active aggragator means it's not safe to use
3759                          * the previous array.
3760                          */
3761                         old_arr = rtnl_dereference(bond->slave_arr);
3762                         if (old_arr) {
3763                                 RCU_INIT_POINTER(bond->slave_arr, NULL);
3764                                 kfree_rcu(old_arr, rcu);
3765                         }
3766                         goto out;
3767                 }
3768                 slaves_in_agg = ad_info.ports;
3769                 agg_id = ad_info.aggregator_id;
3770         }
3771         bond_for_each_slave(bond, slave, iter) {
3772                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3773                         struct aggregator *agg;
3774
3775                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
3776                         if (!agg || agg->aggregator_identifier != agg_id)
3777                                 continue;
3778                 }
3779                 if (!bond_slave_can_tx(slave))
3780                         continue;
3781                 if (skipslave == slave)
3782                         continue;
3783                 new_arr->arr[new_arr->count++] = slave;
3784         }
3785
3786         old_arr = rtnl_dereference(bond->slave_arr);
3787         rcu_assign_pointer(bond->slave_arr, new_arr);
3788         if (old_arr)
3789                 kfree_rcu(old_arr, rcu);
3790 out:
3791         if (ret != 0 && skipslave) {
3792                 int idx;
3793
3794                 /* Rare situation where caller has asked to skip a specific
3795                  * slave but allocation failed (most likely!). BTW this is
3796                  * only possible when the call is initiated from
3797                  * __bond_release_one(). In this situation; overwrite the
3798                  * skipslave entry in the array with the last entry from the
3799                  * array to avoid a situation where the xmit path may choose
3800                  * this to-be-skipped slave to send a packet out.
3801                  */
3802                 old_arr = rtnl_dereference(bond->slave_arr);
3803                 for (idx = 0; idx < old_arr->count; idx++) {
3804                         if (skipslave == old_arr->arr[idx]) {
3805                                 old_arr->arr[idx] =
3806                                     old_arr->arr[old_arr->count-1];
3807                                 old_arr->count--;
3808                                 break;
3809                         }
3810                 }
3811         }
3812         return ret;
3813 }
3814
3815 /* Use this Xmit function for 3AD as well as XOR modes. The current
3816  * usable slave array is formed in the control path. The xmit function
3817  * just calculates hash and sends the packet out.
3818  */
3819 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3820 {
3821         struct bonding *bond = netdev_priv(dev);
3822         struct slave *slave;
3823         struct bond_up_slave *slaves;
3824         unsigned int count;
3825
3826         slaves = rcu_dereference(bond->slave_arr);
3827         count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3828         if (likely(count)) {
3829                 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3830                 bond_dev_queue_xmit(bond, skb, slave->dev);
3831         } else {
3832                 bond_tx_drop(dev, skb);
3833         }
3834
3835         return NETDEV_TX_OK;
3836 }
3837
3838 /* in broadcast mode, we send everything to all usable interfaces. */
3839 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3840 {
3841         struct bonding *bond = netdev_priv(bond_dev);
3842         struct slave *slave = NULL;
3843         struct list_head *iter;
3844
3845         bond_for_each_slave_rcu(bond, slave, iter) {
3846                 if (bond_is_last_slave(bond, slave))
3847                         break;
3848                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3849                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3850
3851                         if (!skb2) {
3852                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3853                                                     bond_dev->name, __func__);
3854                                 continue;
3855                         }
3856                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3857                 }
3858         }
3859         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3860                 bond_dev_queue_xmit(bond, skb, slave->dev);
3861         else
3862                 bond_tx_drop(bond_dev, skb);
3863
3864         return NETDEV_TX_OK;
3865 }
3866
3867 /*------------------------- Device initialization ---------------------------*/
3868
3869 /* Lookup the slave that corresponds to a qid */
3870 static inline int bond_slave_override(struct bonding *bond,
3871                                       struct sk_buff *skb)
3872 {
3873         struct slave *slave = NULL;
3874         struct list_head *iter;
3875
3876         if (!skb->queue_mapping)
3877                 return 1;
3878
3879         /* Find out if any slaves have the same mapping as this skb. */
3880         bond_for_each_slave_rcu(bond, slave, iter) {
3881                 if (slave->queue_id == skb->queue_mapping) {
3882                         if (bond_slave_is_up(slave) &&
3883                             slave->link == BOND_LINK_UP) {
3884                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3885                                 return 0;
3886                         }
3887                         /* If the slave isn't UP, use default transmit policy. */
3888                         break;
3889                 }
3890         }
3891
3892         return 1;
3893 }
3894
3895
3896 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3897                              void *accel_priv, select_queue_fallback_t fallback)
3898 {
3899         /* This helper function exists to help dev_pick_tx get the correct
3900          * destination queue.  Using a helper function skips a call to
3901          * skb_tx_hash and will put the skbs in the queue we expect on their
3902          * way down to the bonding driver.
3903          */
3904         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3905
3906         /* Save the original txq to restore before passing to the driver */
3907         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3908
3909         if (unlikely(txq >= dev->real_num_tx_queues)) {
3910                 do {
3911                         txq -= dev->real_num_tx_queues;
3912                 } while (txq >= dev->real_num_tx_queues);
3913         }
3914         return txq;
3915 }
3916
3917 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3918 {
3919         struct bonding *bond = netdev_priv(dev);
3920
3921         if (bond_should_override_tx_queue(bond) &&
3922             !bond_slave_override(bond, skb))
3923                 return NETDEV_TX_OK;
3924
3925         switch (BOND_MODE(bond)) {
3926         case BOND_MODE_ROUNDROBIN:
3927                 return bond_xmit_roundrobin(skb, dev);
3928         case BOND_MODE_ACTIVEBACKUP:
3929                 return bond_xmit_activebackup(skb, dev);
3930         case BOND_MODE_8023AD:
3931         case BOND_MODE_XOR:
3932                 return bond_3ad_xor_xmit(skb, dev);
3933         case BOND_MODE_BROADCAST:
3934                 return bond_xmit_broadcast(skb, dev);
3935         case BOND_MODE_ALB:
3936                 return bond_alb_xmit(skb, dev);
3937         case BOND_MODE_TLB:
3938                 return bond_tlb_xmit(skb, dev);
3939         default:
3940                 /* Should never happen, mode already checked */
3941                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
3942                 WARN_ON_ONCE(1);
3943                 bond_tx_drop(dev, skb);
3944                 return NETDEV_TX_OK;
3945         }
3946 }
3947
3948 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3949 {
3950         struct bonding *bond = netdev_priv(dev);
3951         netdev_tx_t ret = NETDEV_TX_OK;
3952
3953         /* If we risk deadlock from transmitting this in the
3954          * netpoll path, tell netpoll to queue the frame for later tx
3955          */
3956         if (unlikely(is_netpoll_tx_blocked(dev)))
3957                 return NETDEV_TX_BUSY;
3958
3959         rcu_read_lock();
3960         if (bond_has_slaves(bond))
3961                 ret = __bond_start_xmit(skb, dev);
3962         else
3963                 bond_tx_drop(dev, skb);
3964         rcu_read_unlock();
3965
3966         return ret;
3967 }
3968
3969 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3970                                      struct ethtool_cmd *ecmd)
3971 {
3972         struct bonding *bond = netdev_priv(bond_dev);
3973         unsigned long speed = 0;
3974         struct list_head *iter;
3975         struct slave *slave;
3976
3977         ecmd->duplex = DUPLEX_UNKNOWN;
3978         ecmd->port = PORT_OTHER;
3979
3980         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
3981          * do not need to check mode.  Though link speed might not represent
3982          * the true receive or transmit bandwidth (not all modes are symmetric)
3983          * this is an accurate maximum.
3984          */
3985         bond_for_each_slave(bond, slave, iter) {
3986                 if (bond_slave_can_tx(slave)) {
3987                         if (slave->speed != SPEED_UNKNOWN)
3988                                 speed += slave->speed;
3989                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3990                             slave->duplex != DUPLEX_UNKNOWN)
3991                                 ecmd->duplex = slave->duplex;
3992                 }
3993         }
3994         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3995
3996         return 0;
3997 }
3998
3999 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4000                                      struct ethtool_drvinfo *drvinfo)
4001 {
4002         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4003         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4004         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4005                  BOND_ABI_VERSION);
4006 }
4007
4008 static const struct ethtool_ops bond_ethtool_ops = {
4009         .get_drvinfo            = bond_ethtool_get_drvinfo,
4010         .get_settings           = bond_ethtool_get_settings,
4011         .get_link               = ethtool_op_get_link,
4012 };
4013
4014 static const struct net_device_ops bond_netdev_ops = {
4015         .ndo_init               = bond_init,
4016         .ndo_uninit             = bond_uninit,
4017         .ndo_open               = bond_open,
4018         .ndo_stop               = bond_close,
4019         .ndo_start_xmit         = bond_start_xmit,
4020         .ndo_select_queue       = bond_select_queue,
4021         .ndo_get_stats64        = bond_get_stats,
4022         .ndo_do_ioctl           = bond_do_ioctl,
4023         .ndo_change_rx_flags    = bond_change_rx_flags,
4024         .ndo_set_rx_mode        = bond_set_rx_mode,
4025         .ndo_change_mtu         = bond_change_mtu,
4026         .ndo_set_mac_address    = bond_set_mac_address,
4027         .ndo_neigh_setup        = bond_neigh_setup,
4028         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4029         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4030 #ifdef CONFIG_NET_POLL_CONTROLLER
4031         .ndo_netpoll_setup      = bond_netpoll_setup,
4032         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4033         .ndo_poll_controller    = bond_poll_controller,
4034 #endif
4035         .ndo_add_slave          = bond_enslave,
4036         .ndo_del_slave          = bond_release,
4037         .ndo_fix_features       = bond_fix_features,
4038         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
4039         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
4040         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
4041         .ndo_fdb_add            = switchdev_port_fdb_add,
4042         .ndo_fdb_del            = switchdev_port_fdb_del,
4043         .ndo_fdb_dump           = switchdev_port_fdb_dump,
4044         .ndo_features_check     = passthru_features_check,
4045 };
4046
4047 static const struct device_type bond_type = {
4048         .name = "bond",
4049 };
4050
4051 static void bond_destructor(struct net_device *bond_dev)
4052 {
4053         struct bonding *bond = netdev_priv(bond_dev);
4054         if (bond->wq)
4055                 destroy_workqueue(bond->wq);
4056         free_netdev(bond_dev);
4057 }
4058
4059 void bond_setup(struct net_device *bond_dev)
4060 {
4061         struct bonding *bond = netdev_priv(bond_dev);
4062
4063         spin_lock_init(&bond->mode_lock);
4064         bond->params = bonding_defaults;
4065
4066         /* Initialize pointers */
4067         bond->dev = bond_dev;
4068
4069         /* Initialize the device entry points */
4070         ether_setup(bond_dev);
4071         bond_dev->netdev_ops = &bond_netdev_ops;
4072         bond_dev->ethtool_ops = &bond_ethtool_ops;
4073
4074         bond_dev->destructor = bond_destructor;
4075
4076         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4077
4078         /* Initialize the device options */
4079         bond_dev->tx_queue_len = 0;
4080         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4081         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
4082         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4083
4084         /* don't acquire bond device's netif_tx_lock when transmitting */
4085         bond_dev->features |= NETIF_F_LLTX;
4086
4087         /* By default, we declare the bond to be fully
4088          * VLAN hardware accelerated capable. Special
4089          * care is taken in the various xmit functions
4090          * when there are slaves that are not hw accel
4091          * capable
4092          */
4093
4094         /* Don't allow bond devices to change network namespaces. */
4095         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4096
4097         bond_dev->hw_features = BOND_VLAN_FEATURES |
4098                                 NETIF_F_HW_VLAN_CTAG_TX |
4099                                 NETIF_F_HW_VLAN_CTAG_RX |
4100                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4101
4102         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4103         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4104         bond_dev->features |= bond_dev->hw_features;
4105 }
4106
4107 /* Destroy a bonding device.
4108  * Must be under rtnl_lock when this function is called.
4109  */
4110 static void bond_uninit(struct net_device *bond_dev)
4111 {
4112         struct bonding *bond = netdev_priv(bond_dev);
4113         struct list_head *iter;
4114         struct slave *slave;
4115         struct bond_up_slave *arr;
4116
4117         bond_netpoll_cleanup(bond_dev);
4118
4119         /* Release the bonded slaves */
4120         bond_for_each_slave(bond, slave, iter)
4121                 __bond_release_one(bond_dev, slave->dev, true);
4122         netdev_info(bond_dev, "Released all slaves\n");
4123
4124         arr = rtnl_dereference(bond->slave_arr);
4125         if (arr) {
4126                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4127                 kfree_rcu(arr, rcu);
4128         }
4129
4130         list_del(&bond->bond_list);
4131
4132         bond_debug_unregister(bond);
4133 }
4134
4135 /*------------------------- Module initialization ---------------------------*/
4136
4137 static int bond_check_params(struct bond_params *params)
4138 {
4139         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4140         struct bond_opt_value newval;
4141         const struct bond_opt_value *valptr;
4142         int arp_all_targets_value;
4143         u16 ad_actor_sys_prio = 0;
4144         u16 ad_user_port_key = 0;
4145
4146         /* Convert string parameters. */
4147         if (mode) {
4148                 bond_opt_initstr(&newval, mode);
4149                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4150                 if (!valptr) {
4151                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4152                         return -EINVAL;
4153                 }
4154                 bond_mode = valptr->value;
4155         }
4156
4157         if (xmit_hash_policy) {
4158                 if ((bond_mode != BOND_MODE_XOR) &&
4159                     (bond_mode != BOND_MODE_8023AD) &&
4160                     (bond_mode != BOND_MODE_TLB)) {
4161                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4162                                 bond_mode_name(bond_mode));
4163                 } else {
4164                         bond_opt_initstr(&newval, xmit_hash_policy);
4165                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4166                                                 &newval);
4167                         if (!valptr) {
4168                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4169                                        xmit_hash_policy);
4170                                 return -EINVAL;
4171                         }
4172                         xmit_hashtype = valptr->value;
4173                 }
4174         }
4175
4176         if (lacp_rate) {
4177                 if (bond_mode != BOND_MODE_8023AD) {
4178                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4179                                 bond_mode_name(bond_mode));
4180                 } else {
4181                         bond_opt_initstr(&newval, lacp_rate);
4182                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4183                                                 &newval);
4184                         if (!valptr) {
4185                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4186                                        lacp_rate);
4187                                 return -EINVAL;
4188                         }
4189                         lacp_fast = valptr->value;
4190                 }
4191         }
4192
4193         if (ad_select) {
4194                 bond_opt_initstr(&newval, ad_select);
4195                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4196                                         &newval);
4197                 if (!valptr) {
4198                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4199                         return -EINVAL;
4200                 }
4201                 params->ad_select = valptr->value;
4202                 if (bond_mode != BOND_MODE_8023AD)
4203                         pr_warn("ad_select param only affects 802.3ad mode\n");
4204         } else {
4205                 params->ad_select = BOND_AD_STABLE;
4206         }
4207
4208         if (max_bonds < 0) {
4209                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4210                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4211                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4212         }
4213
4214         if (miimon < 0) {
4215                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4216                         miimon, INT_MAX);
4217                 miimon = 0;
4218         }
4219
4220         if (updelay < 0) {
4221                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4222                         updelay, INT_MAX);
4223                 updelay = 0;
4224         }
4225
4226         if (downdelay < 0) {
4227                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4228                         downdelay, INT_MAX);
4229                 downdelay = 0;
4230         }
4231
4232         if ((use_carrier != 0) && (use_carrier != 1)) {
4233                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4234                         use_carrier);
4235                 use_carrier = 1;
4236         }
4237
4238         if (num_peer_notif < 0 || num_peer_notif > 255) {
4239                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4240                         num_peer_notif);
4241                 num_peer_notif = 1;
4242         }
4243
4244         /* reset values for 802.3ad/TLB/ALB */
4245         if (!bond_mode_uses_arp(bond_mode)) {
4246                 if (!miimon) {
4247                         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");
4248                         pr_warn("Forcing miimon to 100msec\n");
4249                         miimon = BOND_DEFAULT_MIIMON;
4250                 }
4251         }
4252
4253         if (tx_queues < 1 || tx_queues > 255) {
4254                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4255                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4256                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4257         }
4258
4259         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4260                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4261                         all_slaves_active);
4262                 all_slaves_active = 0;
4263         }
4264
4265         if (resend_igmp < 0 || resend_igmp > 255) {
4266                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4267                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4268                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4269         }
4270
4271         bond_opt_initval(&newval, packets_per_slave);
4272         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4273                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4274                         packets_per_slave, USHRT_MAX);
4275                 packets_per_slave = 1;
4276         }
4277
4278         if (bond_mode == BOND_MODE_ALB) {
4279                 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",
4280                           updelay);
4281         }
4282
4283         if (!miimon) {
4284                 if (updelay || downdelay) {
4285                         /* just warn the user the up/down delay will have
4286                          * no effect since miimon is zero...
4287                          */
4288                         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",
4289                                 updelay, downdelay);
4290                 }
4291         } else {
4292                 /* don't allow arp monitoring */
4293                 if (arp_interval) {
4294                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4295                                 miimon, arp_interval);
4296                         arp_interval = 0;
4297                 }
4298
4299                 if ((updelay % miimon) != 0) {
4300                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4301                                 updelay, miimon, (updelay / miimon) * miimon);
4302                 }
4303
4304                 updelay /= miimon;
4305
4306                 if ((downdelay % miimon) != 0) {
4307                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4308                                 downdelay, miimon,
4309                                 (downdelay / miimon) * miimon);
4310                 }
4311
4312                 downdelay /= miimon;
4313         }
4314
4315         if (arp_interval < 0) {
4316                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4317                         arp_interval, INT_MAX);
4318                 arp_interval = 0;
4319         }
4320
4321         for (arp_ip_count = 0, i = 0;
4322              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4323                 __be32 ip;
4324
4325                 /* not a complete check, but good enough to catch mistakes */
4326                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4327                     !bond_is_ip_target_ok(ip)) {
4328                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4329                                 arp_ip_target[i]);
4330                         arp_interval = 0;
4331                 } else {
4332                         if (bond_get_targets_ip(arp_target, ip) == -1)
4333                                 arp_target[arp_ip_count++] = ip;
4334                         else
4335                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4336                                         &ip);
4337                 }
4338         }
4339
4340         if (arp_interval && !arp_ip_count) {
4341                 /* don't allow arping if no arp_ip_target given... */
4342                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4343                         arp_interval);
4344                 arp_interval = 0;
4345         }
4346
4347         if (arp_validate) {
4348                 if (!arp_interval) {
4349                         pr_err("arp_validate requires arp_interval\n");
4350                         return -EINVAL;
4351                 }
4352
4353                 bond_opt_initstr(&newval, arp_validate);
4354                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4355                                         &newval);
4356                 if (!valptr) {
4357                         pr_err("Error: invalid arp_validate \"%s\"\n",
4358                                arp_validate);
4359                         return -EINVAL;
4360                 }
4361                 arp_validate_value = valptr->value;
4362         } else {
4363                 arp_validate_value = 0;
4364         }
4365
4366         arp_all_targets_value = 0;
4367         if (arp_all_targets) {
4368                 bond_opt_initstr(&newval, arp_all_targets);
4369                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4370                                         &newval);
4371                 if (!valptr) {
4372                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4373                                arp_all_targets);
4374                         arp_all_targets_value = 0;
4375                 } else {
4376                         arp_all_targets_value = valptr->value;
4377                 }
4378         }
4379
4380         if (miimon) {
4381                 pr_info("MII link monitoring set to %d ms\n", miimon);
4382         } else if (arp_interval) {
4383                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4384                                           arp_validate_value);
4385                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4386                         arp_interval, valptr->string, arp_ip_count);
4387
4388                 for (i = 0; i < arp_ip_count; i++)
4389                         pr_cont(" %s", arp_ip_target[i]);
4390
4391                 pr_cont("\n");
4392
4393         } else if (max_bonds) {
4394                 /* miimon and arp_interval not set, we need one so things
4395                  * work as expected, see bonding.txt for details
4396                  */
4397                 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");
4398         }
4399
4400         if (primary && !bond_mode_uses_primary(bond_mode)) {
4401                 /* currently, using a primary only makes sense
4402                  * in active backup, TLB or ALB modes
4403                  */
4404                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4405                         primary, bond_mode_name(bond_mode));
4406                 primary = NULL;
4407         }
4408
4409         if (primary && primary_reselect) {
4410                 bond_opt_initstr(&newval, primary_reselect);
4411                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4412                                         &newval);
4413                 if (!valptr) {
4414                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4415                                primary_reselect);
4416                         return -EINVAL;
4417                 }
4418                 primary_reselect_value = valptr->value;
4419         } else {
4420                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4421         }
4422
4423         if (fail_over_mac) {
4424                 bond_opt_initstr(&newval, fail_over_mac);
4425                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4426                                         &newval);
4427                 if (!valptr) {
4428                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4429                                fail_over_mac);
4430                         return -EINVAL;
4431                 }
4432                 fail_over_mac_value = valptr->value;
4433                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4434                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4435         } else {
4436                 fail_over_mac_value = BOND_FOM_NONE;
4437         }
4438
4439         bond_opt_initstr(&newval, "default");
4440         valptr = bond_opt_parse(
4441                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4442                                      &newval);
4443         if (!valptr) {
4444                 pr_err("Error: No ad_actor_sys_prio default value");
4445                 return -EINVAL;
4446         }
4447         ad_actor_sys_prio = valptr->value;
4448
4449         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4450                                 &newval);
4451         if (!valptr) {
4452                 pr_err("Error: No ad_user_port_key default value");
4453                 return -EINVAL;
4454         }
4455         ad_user_port_key = valptr->value;
4456
4457         if (lp_interval == 0) {
4458                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4459                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4460                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4461         }
4462
4463         /* fill params struct with the proper values */
4464         params->mode = bond_mode;
4465         params->xmit_policy = xmit_hashtype;
4466         params->miimon = miimon;
4467         params->num_peer_notif = num_peer_notif;
4468         params->arp_interval = arp_interval;
4469         params->arp_validate = arp_validate_value;
4470         params->arp_all_targets = arp_all_targets_value;
4471         params->updelay = updelay;
4472         params->downdelay = downdelay;
4473         params->use_carrier = use_carrier;
4474         params->lacp_fast = lacp_fast;
4475         params->primary[0] = 0;
4476         params->primary_reselect = primary_reselect_value;
4477         params->fail_over_mac = fail_over_mac_value;
4478         params->tx_queues = tx_queues;
4479         params->all_slaves_active = all_slaves_active;
4480         params->resend_igmp = resend_igmp;
4481         params->min_links = min_links;
4482         params->lp_interval = lp_interval;
4483         params->packets_per_slave = packets_per_slave;
4484         params->tlb_dynamic_lb = 1; /* Default value */
4485         params->ad_actor_sys_prio = ad_actor_sys_prio;
4486         eth_zero_addr(params->ad_actor_system);
4487         params->ad_user_port_key = ad_user_port_key;
4488         if (packets_per_slave > 0) {
4489                 params->reciprocal_packets_per_slave =
4490                         reciprocal_value(packets_per_slave);
4491         } else {
4492                 /* reciprocal_packets_per_slave is unused if
4493                  * packets_per_slave is 0 or 1, just initialize it
4494                  */
4495                 params->reciprocal_packets_per_slave =
4496                         (struct reciprocal_value) { 0 };
4497         }
4498
4499         if (primary) {
4500                 strncpy(params->primary, primary, IFNAMSIZ);
4501                 params->primary[IFNAMSIZ - 1] = 0;
4502         }
4503
4504         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4505
4506         return 0;
4507 }
4508
4509 static struct lock_class_key bonding_netdev_xmit_lock_key;
4510 static struct lock_class_key bonding_netdev_addr_lock_key;
4511 static struct lock_class_key bonding_tx_busylock_key;
4512
4513 static void bond_set_lockdep_class_one(struct net_device *dev,
4514                                        struct netdev_queue *txq,
4515                                        void *_unused)
4516 {
4517         lockdep_set_class(&txq->_xmit_lock,
4518                           &bonding_netdev_xmit_lock_key);
4519 }
4520
4521 static void bond_set_lockdep_class(struct net_device *dev)
4522 {
4523         lockdep_set_class(&dev->addr_list_lock,
4524                           &bonding_netdev_addr_lock_key);
4525         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4526         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4527 }
4528
4529 /* Called from registration process */
4530 static int bond_init(struct net_device *bond_dev)
4531 {
4532         struct bonding *bond = netdev_priv(bond_dev);
4533         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4534
4535         netdev_dbg(bond_dev, "Begin bond_init\n");
4536
4537         bond->wq = create_singlethread_workqueue(bond_dev->name);
4538         if (!bond->wq)
4539                 return -ENOMEM;
4540
4541         bond_set_lockdep_class(bond_dev);
4542
4543         list_add_tail(&bond->bond_list, &bn->dev_list);
4544
4545         bond_prepare_sysfs_group(bond);
4546
4547         bond_debug_register(bond);
4548
4549         /* Ensure valid dev_addr */
4550         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4551             bond_dev->addr_assign_type == NET_ADDR_PERM)
4552                 eth_hw_addr_random(bond_dev);
4553
4554         return 0;
4555 }
4556
4557 unsigned int bond_get_num_tx_queues(void)
4558 {
4559         return tx_queues;
4560 }
4561
4562 /* Create a new bond based on the specified name and bonding parameters.
4563  * If name is NULL, obtain a suitable "bond%d" name for us.
4564  * Caller must NOT hold rtnl_lock; we need to release it here before we
4565  * set up our sysfs entries.
4566  */
4567 int bond_create(struct net *net, const char *name)
4568 {
4569         struct net_device *bond_dev;
4570         struct bonding *bond;
4571         struct alb_bond_info *bond_info;
4572         int res;
4573
4574         rtnl_lock();
4575
4576         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4577                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4578                                    bond_setup, tx_queues);
4579         if (!bond_dev) {
4580                 pr_err("%s: eek! can't alloc netdev!\n", name);
4581                 rtnl_unlock();
4582                 return -ENOMEM;
4583         }
4584
4585         /*
4586          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4587          * It is set to 0 by default which is wrong.
4588          */
4589         bond = netdev_priv(bond_dev);
4590         bond_info = &(BOND_ALB_INFO(bond));
4591         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4592
4593         dev_net_set(bond_dev, net);
4594         bond_dev->rtnl_link_ops = &bond_link_ops;
4595
4596         res = register_netdevice(bond_dev);
4597
4598         netif_carrier_off(bond_dev);
4599
4600         rtnl_unlock();
4601         if (res < 0)
4602                 bond_destructor(bond_dev);
4603         return res;
4604 }
4605
4606 static int __net_init bond_net_init(struct net *net)
4607 {
4608         struct bond_net *bn = net_generic(net, bond_net_id);
4609
4610         bn->net = net;
4611         INIT_LIST_HEAD(&bn->dev_list);
4612
4613         bond_create_proc_dir(bn);
4614         bond_create_sysfs(bn);
4615
4616         return 0;
4617 }
4618
4619 static void __net_exit bond_net_exit(struct net *net)
4620 {
4621         struct bond_net *bn = net_generic(net, bond_net_id);
4622         struct bonding *bond, *tmp_bond;
4623         LIST_HEAD(list);
4624
4625         bond_destroy_sysfs(bn);
4626
4627         /* Kill off any bonds created after unregistering bond rtnl ops */
4628         rtnl_lock();
4629         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4630                 unregister_netdevice_queue(bond->dev, &list);
4631         unregister_netdevice_many(&list);
4632         rtnl_unlock();
4633
4634         bond_destroy_proc_dir(bn);
4635 }
4636
4637 static struct pernet_operations bond_net_ops = {
4638         .init = bond_net_init,
4639         .exit = bond_net_exit,
4640         .id   = &bond_net_id,
4641         .size = sizeof(struct bond_net),
4642 };
4643
4644 static int __init bonding_init(void)
4645 {
4646         int i;
4647         int res;
4648
4649         pr_info("%s", bond_version);
4650
4651         res = bond_check_params(&bonding_defaults);
4652         if (res)
4653                 goto out;
4654
4655         res = register_pernet_subsys(&bond_net_ops);
4656         if (res)
4657                 goto out;
4658
4659         res = bond_netlink_init();
4660         if (res)
4661                 goto err_link;
4662
4663         bond_create_debugfs();
4664
4665         for (i = 0; i < max_bonds; i++) {
4666                 res = bond_create(&init_net, NULL);
4667                 if (res)
4668                         goto err;
4669         }
4670
4671         register_netdevice_notifier(&bond_netdev_notifier);
4672 out:
4673         return res;
4674 err:
4675         bond_destroy_debugfs();
4676         bond_netlink_fini();
4677 err_link:
4678         unregister_pernet_subsys(&bond_net_ops);
4679         goto out;
4680
4681 }
4682
4683 static void __exit bonding_exit(void)
4684 {
4685         unregister_netdevice_notifier(&bond_netdev_notifier);
4686
4687         bond_destroy_debugfs();
4688
4689         bond_netlink_fini();
4690         unregister_pernet_subsys(&bond_net_ops);
4691
4692 #ifdef CONFIG_NET_POLL_CONTROLLER
4693         /* Make sure we don't have an imbalance on our netpoll blocking */
4694         WARN_ON(atomic_read(&netpoll_block_tx));
4695 #endif
4696 }
4697
4698 module_init(bonding_init);
4699 module_exit(bonding_exit);
4700 MODULE_LICENSE("GPL");
4701 MODULE_VERSION(DRV_VERSION);
4702 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4703 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");