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/icmp.h>
  45 #include <linux/icmpv6.h>
  46 #include <linux/tcp.h>
  47 #include <linux/udp.h>
  48 #include <linux/slab.h>
  49 #include <linux/string.h>
  50 #include <linux/init.h>
  51 #include <linux/timer.h>
  52 #include <linux/socket.h>
  53 #include <linux/ctype.h>
  54 #include <linux/inet.h>
  55 #include <linux/bitops.h>
  56 #include <linux/io.h>
  57 #include <asm/dma.h>
  58 #include <linux/uaccess.h>
  59 #include <linux/errno.h>
  60 #include <linux/netdevice.h>
  61 #include <linux/inetdevice.h>
  62 #include <linux/igmp.h>
  63 #include <linux/etherdevice.h>
  64 #include <linux/skbuff.h>
  65 #include <net/sock.h>
  66 #include <linux/rtnetlink.h>
  67 #include <linux/smp.h>
  68 #include <linux/if_ether.h>
  69 #include <net/arp.h>
  70 #include <linux/mii.h>
  71 #include <linux/ethtool.h>
  72 #include <linux/if_vlan.h>
  73 #include <linux/if_bonding.h>
  74 #include <linux/jiffies.h>
  75 #include <linux/preempt.h>
  76 #include <net/route.h>
  77 #include <net/net_namespace.h>
  78 #include <net/netns/generic.h>
  79 #include <net/pkt_sched.h>
  80 #include <linux/rculist.h>
  81 #include <net/flow_dissector.h>
  82 #include <net/xfrm.h>
  83 #include <net/bonding.h>
  84 #include <net/bond_3ad.h>
  85 #include <net/bond_alb.h>
  86
  87 #include "bonding_priv.h"
  88
  89 /*---------------------------- Module parameters ----------------------------*/
  90
  91 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  92
  93 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  94 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  95 static int num_peer_notif = 1;
  96 static int miimon;
  97 static int updelay;
  98 static int downdelay;
  99 static int use_carrier  = 1;
 100 static char *mode;
 101 static char *primary;
 102 static char *primary_reselect;
 103 static char *lacp_rate;
 104 static int min_links;
 105 static char *ad_select;
 106 static char *xmit_hash_policy;
 107 static int arp_interval;
 108 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 109 static char *arp_validate;
 110 static char *arp_all_targets;
 111 static char *fail_over_mac;
 112 static int all_slaves_active;
 113 static struct bond_params bonding_defaults;
 114 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 115 static int packets_per_slave = 1;
 116 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 117
 118 module_param(max_bonds, int, 0);
 119 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 120 module_param(tx_queues, int, 0);
 121 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 122 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 123 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 124                                "failover event (alias of num_unsol_na)");
 125 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 126 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 127                                "failover event (alias of num_grat_arp)");
 128 module_param(miimon, int, 0);
 129 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 130 module_param(updelay, int, 0);
 131 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 132 module_param(downdelay, int, 0);
 133 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 134                             "in milliseconds");
 135 module_param(use_carrier, int, 0);
 136 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 137                               "0 for off, 1 for on (default)");
 138 module_param(mode, charp, 0);
 139 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 140                        "1 for active-backup, 2 for balance-xor, "
 141                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 142                        "6 for balance-alb");
 143 module_param(primary, charp, 0);
 144 MODULE_PARM_DESC(primary, "Primary network device to use");
 145 module_param(primary_reselect, charp, 0);
 146 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 147                                    "once it comes up; "
 148                                    "0 for always (default), "
 149                                    "1 for only if speed of primary is "
 150                                    "better, "
 151                                    "2 for only on active slave "
 152                                    "failure");
 153 module_param(lacp_rate, charp, 0);
 154 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 155                             "0 for slow, 1 for fast");
 156 module_param(ad_select, charp, 0);
 157 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 158                             "0 for stable (default), 1 for bandwidth, "
 159                             "2 for count");
 160 module_param(min_links, int, 0);
 161 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 162
 163 module_param(xmit_hash_policy, charp, 0);
 164 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
 165                                    "0 for layer 2 (default), 1 for layer 3+4, "
 166                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 167                                    "4 for encap layer 3+4");
 168 module_param(arp_interval, int, 0);
 169 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 170 module_param_array(arp_ip_target, charp, NULL, 0);
 171 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 172 module_param(arp_validate, charp, 0);
 173 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 174                                "0 for none (default), 1 for active, "
 175                                "2 for backup, 3 for all");
 176 module_param(arp_all_targets, charp, 0);
 177 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 178 module_param(fail_over_mac, charp, 0);
 179 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 180                                 "the same MAC; 0 for none (default), "
 181                                 "1 for active, 2 for follow");
 182 module_param(all_slaves_active, int, 0);
 183 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 184                                      "by setting active flag for all slaves; "
 185                                      "0 for never (default), 1 for always.");
 186 module_param(resend_igmp, int, 0);
 187 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 188                               "link failure");
 189 module_param(packets_per_slave, int, 0);
 190 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 191                                     "mode; 0 for a random slave, 1 packet per "
 192                                     "slave (default), >1 packets per slave.");
 193 module_param(lp_interval, uint, 0);
 194 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 195                               "the bonding driver sends learning packets to "
 196                               "each slaves peer switch. The default is 1.");
 197
 198 /*----------------------------- Global variables ----------------------------*/
 199
 200 #ifdef CONFIG_NET_POLL_CONTROLLER
 201 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 202 #endif
 203
 204 unsigned int bond_net_id __read_mostly;
 205
 206 static const struct flow_dissector_key flow_keys_bonding_keys[] = {
 207         {
 208                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
 209                 .offset = offsetof(struct flow_keys, control),
 210         },
 211         {
 212                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
 213                 .offset = offsetof(struct flow_keys, basic),
 214         },
 215         {
 216                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 217                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
 218         },
 219         {
 220                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 221                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
 222         },
 223         {
 224                 .key_id = FLOW_DISSECTOR_KEY_TIPC,
 225                 .offset = offsetof(struct flow_keys, addrs.tipckey),
 226         },
 227         {
 228                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
 229                 .offset = offsetof(struct flow_keys, ports),
 230         },
 231         {
 232                 .key_id = FLOW_DISSECTOR_KEY_ICMP,
 233                 .offset = offsetof(struct flow_keys, icmp),
 234         },
 235         {
 236                 .key_id = FLOW_DISSECTOR_KEY_VLAN,
 237                 .offset = offsetof(struct flow_keys, vlan),
 238         },
 239         {
 240                 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
 241                 .offset = offsetof(struct flow_keys, tags),
 242         },
 243         {
 244                 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
 245                 .offset = offsetof(struct flow_keys, keyid),
 246         },
 247 };
 248
 249 static struct flow_dissector flow_keys_bonding __read_mostly;
 250
 251 /*-------------------------- Forward declarations ---------------------------*/
 252
 253 static int bond_init(struct net_device *bond_dev);
 254 static void bond_uninit(struct net_device *bond_dev);
 255 static void bond_get_stats(struct net_device *bond_dev,
 256                            struct rtnl_link_stats64 *stats);
 257 static void bond_slave_arr_handler(struct work_struct *work);
 258 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 259                                   int mod);
 260 static void bond_netdev_notify_work(struct work_struct *work);
 261
 262 /*---------------------------- General routines -----------------------------*/
 263
 264 const char *bond_mode_name(int mode)
 265 {
 266         static const char *names[] = {
 267                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 268                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 269                 [BOND_MODE_XOR] = "load balancing (xor)",
 270                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 271                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 272                 [BOND_MODE_TLB] = "transmit load balancing",
 273                 [BOND_MODE_ALB] = "adaptive load balancing",
 274         };
 275
 276         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 277                 return "unknown";
 278
 279         return names[mode];
 280 }
 281
 282 /**
 283  * bond_dev_queue_xmit - Prepare skb for xmit.
 284  *
 285  * @bond: bond device that got this skb for tx.
 286  * @skb: hw accel VLAN tagged skb to transmit
 287  * @slave_dev: slave that is supposed to xmit this skbuff
 288  */
 289 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 290                         struct net_device *slave_dev)
 291 {
 292         skb->dev = slave_dev;
 293
 294         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 295                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 296         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 297
 298         if (unlikely(netpoll_tx_running(bond->dev)))
 299                 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 300
 301         return dev_queue_xmit(skb);
 302 }
 303
 304 /*---------------------------------- VLAN -----------------------------------*/
 305
 306 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 307  * We don't protect the slave list iteration with a lock because:
 308  * a. This operation is performed in IOCTL context,
 309  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 310  * c. Holding a lock with BH disabled while directly calling a base driver
 311  *    entry point is generally a BAD idea.
 312  *
 313  * The design of synchronization/protection for this operation in the 8021q
 314  * module is good for one or more VLAN devices over a single physical device
 315  * and cannot be extended for a teaming solution like bonding, so there is a
 316  * potential race condition here where a net device from the vlan group might
 317  * be referenced (either by a base driver or the 8021q code) while it is being
 318  * removed from the system. However, it turns out we're not making matters
 319  * worse, and if it works for regular VLAN usage it will work here too.
 320 */
 321
 322 /**
 323  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 324  * @bond_dev: bonding net device that got called
 325  * @proto: network protocol ID
 326  * @vid: vlan id being added
 327  */
 328 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 329                                 __be16 proto, u16 vid)
 330 {
 331         struct bonding *bond = netdev_priv(bond_dev);
 332         struct slave *slave, *rollback_slave;
 333         struct list_head *iter;
 334         int res;
 335
 336         bond_for_each_slave(bond, slave, iter) {
 337                 res = vlan_vid_add(slave->dev, proto, vid);
 338                 if (res)
 339                         goto unwind;
 340         }
 341
 342         return 0;
 343
 344 unwind:
 345         /* unwind to the slave that failed */
 346         bond_for_each_slave(bond, rollback_slave, iter) {
 347                 if (rollback_slave == slave)
 348                         break;
 349
 350                 vlan_vid_del(rollback_slave->dev, proto, vid);
 351         }
 352
 353         return res;
 354 }
 355
 356 /**
 357  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 358  * @bond_dev: bonding net device that got called
 359  * @proto: network protocol ID
 360  * @vid: vlan id being removed
 361  */
 362 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 363                                  __be16 proto, u16 vid)
 364 {
 365         struct bonding *bond = netdev_priv(bond_dev);
 366         struct list_head *iter;
 367         struct slave *slave;
 368
 369         bond_for_each_slave(bond, slave, iter)
 370                 vlan_vid_del(slave->dev, proto, vid);
 371
 372         if (bond_is_lb(bond))
 373                 bond_alb_clear_vlan(bond, vid);
 374
 375         return 0;
 376 }
 377
 378 /*---------------------------------- XFRM -----------------------------------*/
 379
 380 #ifdef CONFIG_XFRM_OFFLOAD
 381 /**
 382  * bond_ipsec_add_sa - program device with a security association
 383  * @xs: pointer to transformer state struct
 384  **/
 385 static int bond_ipsec_add_sa(struct xfrm_state *xs)
 386 {
 387         struct net_device *bond_dev = xs->xso.dev;
 388         struct bonding *bond;
 389         struct slave *slave;
 390
 391         if (!bond_dev)
 392                 return -EINVAL;
 393
 394         bond = netdev_priv(bond_dev);
 395         slave = rcu_dereference(bond->curr_active_slave);
 396         xs->xso.real_dev = slave->dev;
 397         bond->xs = xs;
 398
 399         if (!(slave->dev->xfrmdev_ops
 400               && slave->dev->xfrmdev_ops->xdo_dev_state_add)) {
 401                 slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n");
 402                 return -EINVAL;
 403         }
 404
 405         return slave->dev->xfrmdev_ops->xdo_dev_state_add(xs);
 406 }
 407
 408 /**
 409  * bond_ipsec_del_sa - clear out this specific SA
 410  * @xs: pointer to transformer state struct
 411  **/
 412 static void bond_ipsec_del_sa(struct xfrm_state *xs)
 413 {
 414         struct net_device *bond_dev = xs->xso.dev;
 415         struct bonding *bond;
 416         struct slave *slave;
 417
 418         if (!bond_dev)
 419                 return;
 420
 421         bond = netdev_priv(bond_dev);
 422         slave = rcu_dereference(bond->curr_active_slave);
 423
 424         if (!slave)
 425                 return;
 426
 427         xs->xso.real_dev = slave->dev;
 428
 429         if (!(slave->dev->xfrmdev_ops
 430               && slave->dev->xfrmdev_ops->xdo_dev_state_delete)) {
 431                 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
 432                 return;
 433         }
 434
 435         slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
 436 }
 437
 438 /**
 439  * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
 440  * @skb: current data packet
 441  * @xs: pointer to transformer state struct
 442  **/
 443 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 444 {
 445         struct net_device *bond_dev = xs->xso.dev;
 446         struct bonding *bond = netdev_priv(bond_dev);
 447         struct slave *curr_active = rcu_dereference(bond->curr_active_slave);
 448         struct net_device *slave_dev = curr_active->dev;
 449
 450         if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
 451                 return true;
 452
 453         if (!(slave_dev->xfrmdev_ops
 454               && slave_dev->xfrmdev_ops->xdo_dev_offload_ok)) {
 455                 slave_warn(bond_dev, slave_dev, "%s: no slave xdo_dev_offload_ok\n", __func__);
 456                 return false;
 457         }
 458
 459         xs->xso.real_dev = slave_dev;
 460         return slave_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
 461 }
 462
 463 static const struct xfrmdev_ops bond_xfrmdev_ops = {
 464         .xdo_dev_state_add = bond_ipsec_add_sa,
 465         .xdo_dev_state_delete = bond_ipsec_del_sa,
 466         .xdo_dev_offload_ok = bond_ipsec_offload_ok,
 467 };
 468 #endif /* CONFIG_XFRM_OFFLOAD */
 469
 470 /*------------------------------- Link status -------------------------------*/
 471
 472 /* Set the carrier state for the master according to the state of its
 473  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 474  * do special 802.3ad magic.
 475  *
 476  * Returns zero if carrier state does not change, nonzero if it does.
 477  */
 478 int bond_set_carrier(struct bonding *bond)
 479 {
 480         struct list_head *iter;
 481         struct slave *slave;
 482
 483         if (!bond_has_slaves(bond))
 484                 goto down;
 485
 486         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 487                 return bond_3ad_set_carrier(bond);
 488
 489         bond_for_each_slave(bond, slave, iter) {
 490                 if (slave->link == BOND_LINK_UP) {
 491                         if (!netif_carrier_ok(bond->dev)) {
 492                                 netif_carrier_on(bond->dev);
 493                                 return 1;
 494                         }
 495                         return 0;
 496                 }
 497         }
 498
 499 down:
 500         if (netif_carrier_ok(bond->dev)) {
 501                 netif_carrier_off(bond->dev);
 502                 return 1;
 503         }
 504         return 0;
 505 }
 506
 507 /* Get link speed and duplex from the slave's base driver
 508  * using ethtool. If for some reason the call fails or the
 509  * values are invalid, set speed and duplex to -1,
 510  * and return. Return 1 if speed or duplex settings are
 511  * UNKNOWN; 0 otherwise.
 512  */
 513 static int bond_update_speed_duplex(struct slave *slave)
 514 {
 515         struct net_device *slave_dev = slave->dev;
 516         struct ethtool_link_ksettings ecmd;
 517         int res;
 518
 519         slave->speed = SPEED_UNKNOWN;
 520         slave->duplex = DUPLEX_UNKNOWN;
 521
 522         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 523         if (res < 0)
 524                 return 1;
 525         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 526                 return 1;
 527         switch (ecmd.base.duplex) {
 528         case DUPLEX_FULL:
 529         case DUPLEX_HALF:
 530                 break;
 531         default:
 532                 return 1;
 533         }
 534
 535         slave->speed = ecmd.base.speed;
 536         slave->duplex = ecmd.base.duplex;
 537
 538         return 0;
 539 }
 540
 541 const char *bond_slave_link_status(s8 link)
 542 {
 543         switch (link) {
 544         case BOND_LINK_UP:
 545                 return "up";
 546         case BOND_LINK_FAIL:
 547                 return "going down";
 548         case BOND_LINK_DOWN:
 549                 return "down";
 550         case BOND_LINK_BACK:
 551                 return "going back";
 552         default:
 553                 return "unknown";
 554         }
 555 }
 556
 557 /* if <dev> supports MII link status reporting, check its link status.
 558  *
 559  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 560  * depending upon the setting of the use_carrier parameter.
 561  *
 562  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 563  * can't tell and just pretend it is), or 0, meaning that the link is
 564  * down.
 565  *
 566  * If reporting is non-zero, instead of faking link up, return -1 if
 567  * both ETHTOOL and MII ioctls fail (meaning the device does not
 568  * support them).  If use_carrier is set, return whatever it says.
 569  * It'd be nice if there was a good way to tell if a driver supports
 570  * netif_carrier, but there really isn't.
 571  */
 572 static int bond_check_dev_link(struct bonding *bond,
 573                                struct net_device *slave_dev, int reporting)
 574 {
 575         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 576         int (*ioctl)(struct net_device *, struct ifreq *, int);
 577         struct ifreq ifr;
 578         struct mii_ioctl_data *mii;
 579
 580         if (!reporting && !netif_running(slave_dev))
 581                 return 0;
 582
 583         if (bond->params.use_carrier)
 584                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 585
 586         /* Try to get link status using Ethtool first. */
 587         if (slave_dev->ethtool_ops->get_link)
 588                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 589                         BMSR_LSTATUS : 0;
 590
 591         /* Ethtool can't be used, fallback to MII ioctls. */
 592         ioctl = slave_ops->ndo_do_ioctl;
 593         if (ioctl) {
 594                 /* TODO: set pointer to correct ioctl on a per team member
 595                  *       bases to make this more efficient. that is, once
 596                  *       we determine the correct ioctl, we will always
 597                  *       call it and not the others for that team
 598                  *       member.
 599                  */
 600
 601                 /* We cannot assume that SIOCGMIIPHY will also read a
 602                  * register; not all network drivers (e.g., e100)
 603                  * support that.
 604                  */
 605
 606                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 607                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 608                 mii = if_mii(&ifr);
 609                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 610                         mii->reg_num = MII_BMSR;
 611                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 612                                 return mii->val_out & BMSR_LSTATUS;
 613                 }
 614         }
 615
 616         /* If reporting, report that either there's no dev->do_ioctl,
 617          * or both SIOCGMIIREG and get_link failed (meaning that we
 618          * cannot report link status).  If not reporting, pretend
 619          * we're ok.
 620          */
 621         return reporting ? -1 : BMSR_LSTATUS;
 622 }
 623
 624 /*----------------------------- Multicast list ------------------------------*/
 625
 626 /* Push the promiscuity flag down to appropriate slaves */
 627 static int bond_set_promiscuity(struct bonding *bond, int inc)
 628 {
 629         struct list_head *iter;
 630         int err = 0;
 631
 632         if (bond_uses_primary(bond)) {
 633                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 634
 635                 if (curr_active)
 636                         err = dev_set_promiscuity(curr_active->dev, inc);
 637         } else {
 638                 struct slave *slave;
 639
 640                 bond_for_each_slave(bond, slave, iter) {
 641                         err = dev_set_promiscuity(slave->dev, inc);
 642                         if (err)
 643                                 return err;
 644                 }
 645         }
 646         return err;
 647 }
 648
 649 /* Push the allmulti flag down to all slaves */
 650 static int bond_set_allmulti(struct bonding *bond, int inc)
 651 {
 652         struct list_head *iter;
 653         int err = 0;
 654
 655         if (bond_uses_primary(bond)) {
 656                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 657
 658                 if (curr_active)
 659                         err = dev_set_allmulti(curr_active->dev, inc);
 660         } else {
 661                 struct slave *slave;
 662
 663                 bond_for_each_slave(bond, slave, iter) {
 664                         err = dev_set_allmulti(slave->dev, inc);
 665                         if (err)
 666                                 return err;
 667                 }
 668         }
 669         return err;
 670 }
 671
 672 /* Retrieve the list of registered multicast addresses for the bonding
 673  * device and retransmit an IGMP JOIN request to the current active
 674  * slave.
 675  */
 676 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 677 {
 678         struct bonding *bond = container_of(work, struct bonding,
 679                                             mcast_work.work);
 680
 681         if (!rtnl_trylock()) {
 682                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 683                 return;
 684         }
 685         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 686
 687         if (bond->igmp_retrans > 1) {
 688                 bond->igmp_retrans--;
 689                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 690         }
 691         rtnl_unlock();
 692 }
 693
 694 /* Flush bond's hardware addresses from slave */
 695 static void bond_hw_addr_flush(struct net_device *bond_dev,
 696                                struct net_device *slave_dev)
 697 {
 698         struct bonding *bond = netdev_priv(bond_dev);
 699
 700         dev_uc_unsync(slave_dev, bond_dev);
 701         dev_mc_unsync(slave_dev, bond_dev);
 702
 703         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 704                 /* del lacpdu mc addr from mc list */
 705                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 706
 707                 dev_mc_del(slave_dev, lacpdu_multicast);
 708         }
 709 }
 710
 711 /*--------------------------- Active slave change ---------------------------*/
 712
 713 /* Update the hardware address list and promisc/allmulti for the new and
 714  * old active slaves (if any).  Modes that are not using primary keep all
 715  * slaves up date at all times; only the modes that use primary need to call
 716  * this function to swap these settings during a failover.
 717  */
 718 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 719                               struct slave *old_active)
 720 {
 721         if (old_active) {
 722                 if (bond->dev->flags & IFF_PROMISC)
 723                         dev_set_promiscuity(old_active->dev, -1);
 724
 725                 if (bond->dev->flags & IFF_ALLMULTI)
 726                         dev_set_allmulti(old_active->dev, -1);
 727
 728                 bond_hw_addr_flush(bond->dev, old_active->dev);
 729         }
 730
 731         if (new_active) {
 732                 /* FIXME: Signal errors upstream. */
 733                 if (bond->dev->flags & IFF_PROMISC)
 734                         dev_set_promiscuity(new_active->dev, 1);
 735
 736                 if (bond->dev->flags & IFF_ALLMULTI)
 737                         dev_set_allmulti(new_active->dev, 1);
 738
 739                 netif_addr_lock_bh(bond->dev);
 740                 dev_uc_sync(new_active->dev, bond->dev);
 741                 dev_mc_sync(new_active->dev, bond->dev);
 742                 netif_addr_unlock_bh(bond->dev);
 743         }
 744 }
 745
 746 /**
 747  * bond_set_dev_addr - clone slave's address to bond
 748  * @bond_dev: bond net device
 749  * @slave_dev: slave net device
 750  *
 751  * Should be called with RTNL held.
 752  */
 753 static int bond_set_dev_addr(struct net_device *bond_dev,
 754                              struct net_device *slave_dev)
 755 {
 756         int err;
 757
 758         slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 759                   bond_dev, slave_dev, slave_dev->addr_len);
 760         err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 761         if (err)
 762                 return err;
 763
 764         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 765         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 766         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 767         return 0;
 768 }
 769
 770 static struct slave *bond_get_old_active(struct bonding *bond,
 771                                          struct slave *new_active)
 772 {
 773         struct slave *slave;
 774         struct list_head *iter;
 775
 776         bond_for_each_slave(bond, slave, iter) {
 777                 if (slave == new_active)
 778                         continue;
 779
 780                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 781                         return slave;
 782         }
 783
 784         return NULL;
 785 }
 786
 787 /* bond_do_fail_over_mac
 788  *
 789  * Perform special MAC address swapping for fail_over_mac settings
 790  *
 791  * Called with RTNL
 792  */
 793 static void bond_do_fail_over_mac(struct bonding *bond,
 794                                   struct slave *new_active,
 795                                   struct slave *old_active)
 796 {
 797         u8 tmp_mac[MAX_ADDR_LEN];
 798         struct sockaddr_storage ss;
 799         int rv;
 800
 801         switch (bond->params.fail_over_mac) {
 802         case BOND_FOM_ACTIVE:
 803                 if (new_active) {
 804                         rv = bond_set_dev_addr(bond->dev, new_active->dev);
 805                         if (rv)
 806                                 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
 807                                           -rv);
 808                 }
 809                 break;
 810         case BOND_FOM_FOLLOW:
 811                 /* if new_active && old_active, swap them
 812                  * if just old_active, do nothing (going to no active slave)
 813                  * if just new_active, set new_active to bond's MAC
 814                  */
 815                 if (!new_active)
 816                         return;
 817
 818                 if (!old_active)
 819                         old_active = bond_get_old_active(bond, new_active);
 820
 821                 if (old_active) {
 822                         bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 823                                           new_active->dev->addr_len);
 824                         bond_hw_addr_copy(ss.__data,
 825                                           old_active->dev->dev_addr,
 826                                           old_active->dev->addr_len);
 827                         ss.ss_family = new_active->dev->type;
 828                 } else {
 829                         bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 830                                           bond->dev->addr_len);
 831                         ss.ss_family = bond->dev->type;
 832                 }
 833
 834                 rv = dev_set_mac_address(new_active->dev,
 835                                          (struct sockaddr *)&ss, NULL);
 836                 if (rv) {
 837                         slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
 838                                   -rv);
 839                         goto out;
 840                 }
 841
 842                 if (!old_active)
 843                         goto out;
 844
 845                 bond_hw_addr_copy(ss.__data, tmp_mac,
 846                                   new_active->dev->addr_len);
 847                 ss.ss_family = old_active->dev->type;
 848
 849                 rv = dev_set_mac_address(old_active->dev,
 850                                          (struct sockaddr *)&ss, NULL);
 851                 if (rv)
 852                         slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
 853                                   -rv);
 854 out:
 855                 break;
 856         default:
 857                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 858                            bond->params.fail_over_mac);
 859                 break;
 860         }
 861
 862 }
 863
 864 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
 865 {
 866         struct slave *prim = rtnl_dereference(bond->primary_slave);
 867         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 868
 869         if (!prim || prim->link != BOND_LINK_UP) {
 870                 if (!curr || curr->link != BOND_LINK_UP)
 871                         return NULL;
 872                 return curr;
 873         }
 874
 875         if (bond->force_primary) {
 876                 bond->force_primary = false;
 877                 return prim;
 878         }
 879
 880         if (!curr || curr->link != BOND_LINK_UP)
 881                 return prim;
 882
 883         /* At this point, prim and curr are both up */
 884         switch (bond->params.primary_reselect) {
 885         case BOND_PRI_RESELECT_ALWAYS:
 886                 return prim;
 887         case BOND_PRI_RESELECT_BETTER:
 888                 if (prim->speed < curr->speed)
 889                         return curr;
 890                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
 891                         return curr;
 892                 return prim;
 893         case BOND_PRI_RESELECT_FAILURE:
 894                 return curr;
 895         default:
 896                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
 897                            bond->params.primary_reselect);
 898                 return curr;
 899         }
 900 }
 901
 902 /**
 903  * bond_find_best_slave - select the best available slave to be the active one
 904  * @bond: our bonding struct
 905  */
 906 static struct slave *bond_find_best_slave(struct bonding *bond)
 907 {
 908         struct slave *slave, *bestslave = NULL;
 909         struct list_head *iter;
 910         int mintime = bond->params.updelay;
 911
 912         slave = bond_choose_primary_or_current(bond);
 913         if (slave)
 914                 return slave;
 915
 916         bond_for_each_slave(bond, slave, iter) {
 917                 if (slave->link == BOND_LINK_UP)
 918                         return slave;
 919                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 920                     slave->delay < mintime) {
 921                         mintime = slave->delay;
 922                         bestslave = slave;
 923                 }
 924         }
 925
 926         return bestslave;
 927 }
 928
 929 static bool bond_should_notify_peers(struct bonding *bond)
 930 {
 931         struct slave *slave;
 932
 933         rcu_read_lock();
 934         slave = rcu_dereference(bond->curr_active_slave);
 935         rcu_read_unlock();
 936
 937         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 938                    slave ? slave->dev->name : "NULL");
 939
 940         if (!slave || !bond->send_peer_notif ||
 941             bond->send_peer_notif %
 942             max(1, bond->params.peer_notif_delay) != 0 ||
 943             !netif_carrier_ok(bond->dev) ||
 944             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 945                 return false;
 946
 947         return true;
 948 }
 949
 950 /**
 951  * change_active_interface - change the active slave into the specified one
 952  * @bond: our bonding struct
 953  * @new_active: the new slave to make the active one
 954  *
 955  * Set the new slave to the bond's settings and unset them on the old
 956  * curr_active_slave.
 957  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 958  *
 959  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 960  * because it is apparently the best available slave we have, even though its
 961  * updelay hasn't timed out yet.
 962  *
 963  * Caller must hold RTNL.
 964  */
 965 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 966 {
 967         struct slave *old_active;
 968
 969         ASSERT_RTNL();
 970
 971         old_active = rtnl_dereference(bond->curr_active_slave);
 972
 973         if (old_active == new_active)
 974                 return;
 975
 976 #ifdef CONFIG_XFRM_OFFLOAD
 977         if (old_active && bond->xs)
 978                 bond_ipsec_del_sa(bond->xs);
 979 #endif /* CONFIG_XFRM_OFFLOAD */
 980
 981         if (new_active) {
 982                 new_active->last_link_up = jiffies;
 983
 984                 if (new_active->link == BOND_LINK_BACK) {
 985                         if (bond_uses_primary(bond)) {
 986                                 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
 987                                            (bond->params.updelay - new_active->delay) * bond->params.miimon);
 988                         }
 989
 990                         new_active->delay = 0;
 991                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
 992                                                   BOND_SLAVE_NOTIFY_NOW);
 993
 994                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 995                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 996
 997                         if (bond_is_lb(bond))
 998                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 999                 } else {
1000                         if (bond_uses_primary(bond)) {
1001                                 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1002                         }
1003                 }
1004         }
1005
1006         if (bond_uses_primary(bond))
1007                 bond_hw_addr_swap(bond, new_active, old_active);
1008
1009         if (bond_is_lb(bond)) {
1010                 bond_alb_handle_active_change(bond, new_active);
1011                 if (old_active)
1012                         bond_set_slave_inactive_flags(old_active,
1013                                                       BOND_SLAVE_NOTIFY_NOW);
1014                 if (new_active)
1015                         bond_set_slave_active_flags(new_active,
1016                                                     BOND_SLAVE_NOTIFY_NOW);
1017         } else {
1018                 rcu_assign_pointer(bond->curr_active_slave, new_active);
1019         }
1020
1021         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1022                 if (old_active)
1023                         bond_set_slave_inactive_flags(old_active,
1024                                                       BOND_SLAVE_NOTIFY_NOW);
1025
1026                 if (new_active) {
1027                         bool should_notify_peers = false;
1028
1029                         bond_set_slave_active_flags(new_active,
1030                                                     BOND_SLAVE_NOTIFY_NOW);
1031
1032                         if (bond->params.fail_over_mac)
1033                                 bond_do_fail_over_mac(bond, new_active,
1034                                                       old_active);
1035
1036                         if (netif_running(bond->dev)) {
1037                                 bond->send_peer_notif =
1038                                         bond->params.num_peer_notif *
1039                                         max(1, bond->params.peer_notif_delay);
1040                                 should_notify_peers =
1041                                         bond_should_notify_peers(bond);
1042                         }
1043
1044                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1045                         if (should_notify_peers) {
1046                                 bond->send_peer_notif--;
1047                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1048                                                          bond->dev);
1049                         }
1050                 }
1051         }
1052
1053 #ifdef CONFIG_XFRM_OFFLOAD
1054         if (new_active && bond->xs) {
1055                 xfrm_dev_state_flush(dev_net(bond->dev), bond->dev, true);
1056                 bond_ipsec_add_sa(bond->xs);
1057         }
1058 #endif /* CONFIG_XFRM_OFFLOAD */
1059
1060         /* resend IGMP joins since active slave has changed or
1061          * all were sent on curr_active_slave.
1062          * resend only if bond is brought up with the affected
1063          * bonding modes and the retransmission is enabled
1064          */
1065         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1066             ((bond_uses_primary(bond) && new_active) ||
1067              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1068                 bond->igmp_retrans = bond->params.resend_igmp;
1069                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1070         }
1071 }
1072
1073 /**
1074  * bond_select_active_slave - select a new active slave, if needed
1075  * @bond: our bonding struct
1076  *
1077  * This functions should be called when one of the following occurs:
1078  * - The old curr_active_slave has been released or lost its link.
1079  * - The primary_slave has got its link back.
1080  * - A slave has got its link back and there's no old curr_active_slave.
1081  *
1082  * Caller must hold RTNL.
1083  */
1084 void bond_select_active_slave(struct bonding *bond)
1085 {
1086         struct slave *best_slave;
1087         int rv;
1088
1089         ASSERT_RTNL();
1090
1091         best_slave = bond_find_best_slave(bond);
1092         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1093                 bond_change_active_slave(bond, best_slave);
1094                 rv = bond_set_carrier(bond);
1095                 if (!rv)
1096                         return;
1097
1098                 if (netif_carrier_ok(bond->dev))
1099                         netdev_info(bond->dev, "active interface up!\n");
1100                 else
1101                         netdev_info(bond->dev, "now running without any active interface!\n");
1102         }
1103 }
1104
1105 #ifdef CONFIG_NET_POLL_CONTROLLER
1106 static inline int slave_enable_netpoll(struct slave *slave)
1107 {
1108         struct netpoll *np;
1109         int err = 0;
1110
1111         np = kzalloc(sizeof(*np), GFP_KERNEL);
1112         err = -ENOMEM;
1113         if (!np)
1114                 goto out;
1115
1116         err = __netpoll_setup(np, slave->dev);
1117         if (err) {
1118                 kfree(np);
1119                 goto out;
1120         }
1121         slave->np = np;
1122 out:
1123         return err;
1124 }
1125 static inline void slave_disable_netpoll(struct slave *slave)
1126 {
1127         struct netpoll *np = slave->np;
1128
1129         if (!np)
1130                 return;
1131
1132         slave->np = NULL;
1133
1134         __netpoll_free(np);
1135 }
1136
1137 static void bond_poll_controller(struct net_device *bond_dev)
1138 {
1139         struct bonding *bond = netdev_priv(bond_dev);
1140         struct slave *slave = NULL;
1141         struct list_head *iter;
1142         struct ad_info ad_info;
1143
1144         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1145                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
1146                         return;
1147
1148         bond_for_each_slave_rcu(bond, slave, iter) {
1149                 if (!bond_slave_is_up(slave))
1150                         continue;
1151
1152                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1153                         struct aggregator *agg =
1154                             SLAVE_AD_INFO(slave)->port.aggregator;
1155
1156                         if (agg &&
1157                             agg->aggregator_identifier != ad_info.aggregator_id)
1158                                 continue;
1159                 }
1160
1161                 netpoll_poll_dev(slave->dev);
1162         }
1163 }
1164
1165 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1166 {
1167         struct bonding *bond = netdev_priv(bond_dev);
1168         struct list_head *iter;
1169         struct slave *slave;
1170
1171         bond_for_each_slave(bond, slave, iter)
1172                 if (bond_slave_is_up(slave))
1173                         slave_disable_netpoll(slave);
1174 }
1175
1176 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1177 {
1178         struct bonding *bond = netdev_priv(dev);
1179         struct list_head *iter;
1180         struct slave *slave;
1181         int err = 0;
1182
1183         bond_for_each_slave(bond, slave, iter) {
1184                 err = slave_enable_netpoll(slave);
1185                 if (err) {
1186                         bond_netpoll_cleanup(dev);
1187                         break;
1188                 }
1189         }
1190         return err;
1191 }
1192 #else
1193 static inline int slave_enable_netpoll(struct slave *slave)
1194 {
1195         return 0;
1196 }
1197 static inline void slave_disable_netpoll(struct slave *slave)
1198 {
1199 }
1200 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1201 {
1202 }
1203 #endif
1204
1205 /*---------------------------------- IOCTL ----------------------------------*/
1206
1207 static netdev_features_t bond_fix_features(struct net_device *dev,
1208                                            netdev_features_t features)
1209 {
1210         struct bonding *bond = netdev_priv(dev);
1211         struct list_head *iter;
1212         netdev_features_t mask;
1213         struct slave *slave;
1214
1215         mask = features;
1216
1217         features &= ~NETIF_F_ONE_FOR_ALL;
1218         features |= NETIF_F_ALL_FOR_ALL;
1219
1220         bond_for_each_slave(bond, slave, iter) {
1221                 features = netdev_increment_features(features,
1222                                                      slave->dev->features,
1223                                                      mask);
1224         }
1225         features = netdev_add_tso_features(features, mask);
1226
1227         return features;
1228 }
1229
1230 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1231                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1232                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1233
1234 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1235                                  NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1236
1237 #define BOND_MPLS_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1238                                  NETIF_F_ALL_TSO)
1239
1240
1241 static void bond_compute_features(struct bonding *bond)
1242 {
1243         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1244                                         IFF_XMIT_DST_RELEASE_PERM;
1245         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1246         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1247 #ifdef CONFIG_XFRM_OFFLOAD
1248         netdev_features_t xfrm_features  = BOND_XFRM_FEATURES;
1249 #endif /* CONFIG_XFRM_OFFLOAD */
1250         netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1251         struct net_device *bond_dev = bond->dev;
1252         struct list_head *iter;
1253         struct slave *slave;
1254         unsigned short max_hard_header_len = ETH_HLEN;
1255         unsigned int gso_max_size = GSO_MAX_SIZE;
1256         u16 gso_max_segs = GSO_MAX_SEGS;
1257
1258         if (!bond_has_slaves(bond))
1259                 goto done;
1260         vlan_features &= NETIF_F_ALL_FOR_ALL;
1261         mpls_features &= NETIF_F_ALL_FOR_ALL;
1262
1263         bond_for_each_slave(bond, slave, iter) {
1264                 vlan_features = netdev_increment_features(vlan_features,
1265                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1266
1267                 enc_features = netdev_increment_features(enc_features,
1268                                                          slave->dev->hw_enc_features,
1269                                                          BOND_ENC_FEATURES);
1270
1271 #ifdef CONFIG_XFRM_OFFLOAD
1272                 xfrm_features = netdev_increment_features(xfrm_features,
1273                                                           slave->dev->hw_enc_features,
1274                                                           BOND_XFRM_FEATURES);
1275 #endif /* CONFIG_XFRM_OFFLOAD */
1276
1277                 mpls_features = netdev_increment_features(mpls_features,
1278                                                           slave->dev->mpls_features,
1279                                                           BOND_MPLS_FEATURES);
1280
1281                 dst_release_flag &= slave->dev->priv_flags;
1282                 if (slave->dev->hard_header_len > max_hard_header_len)
1283                         max_hard_header_len = slave->dev->hard_header_len;
1284
1285                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1286                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1287         }
1288         bond_dev->hard_header_len = max_hard_header_len;
1289
1290 done:
1291         bond_dev->vlan_features = vlan_features;
1292         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1293                                     NETIF_F_HW_VLAN_CTAG_TX |
1294                                     NETIF_F_HW_VLAN_STAG_TX |
1295                                     NETIF_F_GSO_UDP_L4;
1296 #ifdef CONFIG_XFRM_OFFLOAD
1297         bond_dev->hw_enc_features |= xfrm_features;
1298 #endif /* CONFIG_XFRM_OFFLOAD */
1299         bond_dev->mpls_features = mpls_features;
1300         bond_dev->gso_max_segs = gso_max_segs;
1301         netif_set_gso_max_size(bond_dev, gso_max_size);
1302
1303         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1304         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1305             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1306                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1307
1308         netdev_change_features(bond_dev);
1309 }
1310
1311 static void bond_setup_by_slave(struct net_device *bond_dev,
1312                                 struct net_device *slave_dev)
1313 {
1314         bond_dev->header_ops        = slave_dev->header_ops;
1315
1316         bond_dev->type              = slave_dev->type;
1317         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1318         bond_dev->addr_len          = slave_dev->addr_len;
1319
1320         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1321                 slave_dev->addr_len);
1322 }
1323
1324 /* On bonding slaves other than the currently active slave, suppress
1325  * duplicates except for alb non-mcast/bcast.
1326  */
1327 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1328                                             struct slave *slave,
1329                                             struct bonding *bond)
1330 {
1331         if (bond_is_slave_inactive(slave)) {
1332                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1333                     skb->pkt_type != PACKET_BROADCAST &&
1334                     skb->pkt_type != PACKET_MULTICAST)
1335                         return false;
1336                 return true;
1337         }
1338         return false;
1339 }
1340
1341 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1342 {
1343         struct sk_buff *skb = *pskb;
1344         struct slave *slave;
1345         struct bonding *bond;
1346         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1347                           struct slave *);
1348         int ret = RX_HANDLER_ANOTHER;
1349
1350         skb = skb_share_check(skb, GFP_ATOMIC);
1351         if (unlikely(!skb))
1352                 return RX_HANDLER_CONSUMED;
1353
1354         *pskb = skb;
1355
1356         slave = bond_slave_get_rcu(skb->dev);
1357         bond = slave->bond;
1358
1359         recv_probe = READ_ONCE(bond->recv_probe);
1360         if (recv_probe) {
1361                 ret = recv_probe(skb, bond, slave);
1362                 if (ret == RX_HANDLER_CONSUMED) {
1363                         consume_skb(skb);
1364                         return ret;
1365                 }
1366         }
1367
1368         /*
1369          * For packets determined by bond_should_deliver_exact_match() call to
1370          * be suppressed we want to make an exception for link-local packets.
1371          * This is necessary for e.g. LLDP daemons to be able to monitor
1372          * inactive slave links without being forced to bind to them
1373          * explicitly.
1374          *
1375          * At the same time, packets that are passed to the bonding master
1376          * (including link-local ones) can have their originating interface
1377          * determined via PACKET_ORIGDEV socket option.
1378          */
1379         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1380                 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1381                         return RX_HANDLER_PASS;
1382                 return RX_HANDLER_EXACT;
1383         }
1384
1385         skb->dev = bond->dev;
1386
1387         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1388             netif_is_bridge_port(bond->dev) &&
1389             skb->pkt_type == PACKET_HOST) {
1390
1391                 if (unlikely(skb_cow_head(skb,
1392                                           skb->data - skb_mac_header(skb)))) {
1393                         kfree_skb(skb);
1394                         return RX_HANDLER_CONSUMED;
1395                 }
1396                 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1397                                   bond->dev->addr_len);
1398         }
1399
1400         return ret;
1401 }
1402
1403 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1404 {
1405         switch (BOND_MODE(bond)) {
1406         case BOND_MODE_ROUNDROBIN:
1407                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1408         case BOND_MODE_ACTIVEBACKUP:
1409                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1410         case BOND_MODE_BROADCAST:
1411                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1412         case BOND_MODE_XOR:
1413         case BOND_MODE_8023AD:
1414                 return NETDEV_LAG_TX_TYPE_HASH;
1415         default:
1416                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1417         }
1418 }
1419
1420 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1421                                                enum netdev_lag_tx_type type)
1422 {
1423         if (type != NETDEV_LAG_TX_TYPE_HASH)
1424                 return NETDEV_LAG_HASH_NONE;
1425
1426         switch (bond->params.xmit_policy) {
1427         case BOND_XMIT_POLICY_LAYER2:
1428                 return NETDEV_LAG_HASH_L2;
1429         case BOND_XMIT_POLICY_LAYER34:
1430                 return NETDEV_LAG_HASH_L34;
1431         case BOND_XMIT_POLICY_LAYER23:
1432                 return NETDEV_LAG_HASH_L23;
1433         case BOND_XMIT_POLICY_ENCAP23:
1434                 return NETDEV_LAG_HASH_E23;
1435         case BOND_XMIT_POLICY_ENCAP34:
1436                 return NETDEV_LAG_HASH_E34;
1437         default:
1438                 return NETDEV_LAG_HASH_UNKNOWN;
1439         }
1440 }
1441
1442 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1443                                       struct netlink_ext_ack *extack)
1444 {
1445         struct netdev_lag_upper_info lag_upper_info;
1446         enum netdev_lag_tx_type type;
1447
1448         type = bond_lag_tx_type(bond);
1449         lag_upper_info.tx_type = type;
1450         lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1451
1452         return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1453                                             &lag_upper_info, extack);
1454 }
1455
1456 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1457 {
1458         netdev_upper_dev_unlink(slave->dev, bond->dev);
1459         slave->dev->flags &= ~IFF_SLAVE;
1460 }
1461
1462 static struct slave *bond_alloc_slave(struct bonding *bond)
1463 {
1464         struct slave *slave = NULL;
1465
1466         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1467         if (!slave)
1468                 return NULL;
1469
1470         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1471                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1472                                                GFP_KERNEL);
1473                 if (!SLAVE_AD_INFO(slave)) {
1474                         kfree(slave);
1475                         return NULL;
1476                 }
1477         }
1478         INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1479
1480         return slave;
1481 }
1482
1483 static void bond_free_slave(struct slave *slave)
1484 {
1485         struct bonding *bond = bond_get_bond_by_slave(slave);
1486
1487         cancel_delayed_work_sync(&slave->notify_work);
1488         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1489                 kfree(SLAVE_AD_INFO(slave));
1490
1491         kfree(slave);
1492 }
1493
1494 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1495 {
1496         info->bond_mode = BOND_MODE(bond);
1497         info->miimon = bond->params.miimon;
1498         info->num_slaves = bond->slave_cnt;
1499 }
1500
1501 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1502 {
1503         strcpy(info->slave_name, slave->dev->name);
1504         info->link = slave->link;
1505         info->state = bond_slave_state(slave);
1506         info->link_failure_count = slave->link_failure_count;
1507 }
1508
1509 static void bond_netdev_notify_work(struct work_struct *_work)
1510 {
1511         struct slave *slave = container_of(_work, struct slave,
1512                                            notify_work.work);
1513
1514         if (rtnl_trylock()) {
1515                 struct netdev_bonding_info binfo;
1516
1517                 bond_fill_ifslave(slave, &binfo.slave);
1518                 bond_fill_ifbond(slave->bond, &binfo.master);
1519                 netdev_bonding_info_change(slave->dev, &binfo);
1520                 rtnl_unlock();
1521         } else {
1522                 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1523         }
1524 }
1525
1526 void bond_queue_slave_event(struct slave *slave)
1527 {
1528         queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1529 }
1530
1531 void bond_lower_state_changed(struct slave *slave)
1532 {
1533         struct netdev_lag_lower_state_info info;
1534
1535         info.link_up = slave->link == BOND_LINK_UP ||
1536                        slave->link == BOND_LINK_FAIL;
1537         info.tx_enabled = bond_is_active_slave(slave);
1538         netdev_lower_state_changed(slave->dev, &info);
1539 }
1540
1541 /* enslave device <slave> to bond device <master> */
1542 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1543                  struct netlink_ext_ack *extack)
1544 {
1545         struct bonding *bond = netdev_priv(bond_dev);
1546         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1547         struct slave *new_slave = NULL, *prev_slave;
1548         struct sockaddr_storage ss;
1549         int link_reporting;
1550         int res = 0, i;
1551
1552         if (!bond->params.use_carrier &&
1553             slave_dev->ethtool_ops->get_link == NULL &&
1554             slave_ops->ndo_do_ioctl == NULL) {
1555                 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1556         }
1557
1558         /* already in-use? */
1559         if (netdev_is_rx_handler_busy(slave_dev)) {
1560                 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1561                 slave_err(bond_dev, slave_dev,
1562                           "Error: Device is in use and cannot be enslaved\n");
1563                 return -EBUSY;
1564         }
1565
1566         if (bond_dev == slave_dev) {
1567                 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1568                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1569                 return -EPERM;
1570         }
1571
1572         /* vlan challenged mutual exclusion */
1573         /* no need to lock since we're protected by rtnl_lock */
1574         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1575                 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1576                 if (vlan_uses_dev(bond_dev)) {
1577                         NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1578                         slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1579                         return -EPERM;
1580                 } else {
1581                         slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1582                 }
1583         } else {
1584                 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1585         }
1586
1587         if (slave_dev->features & NETIF_F_HW_ESP)
1588                 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1589
1590         /* Old ifenslave binaries are no longer supported.  These can
1591          * be identified with moderate accuracy by the state of the slave:
1592          * the current ifenslave will set the interface down prior to
1593          * enslaving it; the old ifenslave will not.
1594          */
1595         if (slave_dev->flags & IFF_UP) {
1596                 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1597                 slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1598                 return -EPERM;
1599         }
1600
1601         /* set bonding device ether type by slave - bonding netdevices are
1602          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1603          * there is a need to override some of the type dependent attribs/funcs.
1604          *
1605          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1606          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1607          */
1608         if (!bond_has_slaves(bond)) {
1609                 if (bond_dev->type != slave_dev->type) {
1610                         slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1611                                   bond_dev->type, slave_dev->type);
1612
1613                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1614                                                        bond_dev);
1615                         res = notifier_to_errno(res);
1616                         if (res) {
1617                                 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1618                                 return -EBUSY;
1619                         }
1620
1621                         /* Flush unicast and multicast addresses */
1622                         dev_uc_flush(bond_dev);
1623                         dev_mc_flush(bond_dev);
1624
1625                         if (slave_dev->type != ARPHRD_ETHER)
1626                                 bond_setup_by_slave(bond_dev, slave_dev);
1627                         else {
1628                                 ether_setup(bond_dev);
1629                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1630                         }
1631
1632                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1633                                                  bond_dev);
1634                 }
1635         } else if (bond_dev->type != slave_dev->type) {
1636                 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1637                 slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1638                           slave_dev->type, bond_dev->type);
1639                 return -EINVAL;
1640         }
1641
1642         if (slave_dev->type == ARPHRD_INFINIBAND &&
1643             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1644                 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1645                 slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1646                            slave_dev->type);
1647                 res = -EOPNOTSUPP;
1648                 goto err_undo_flags;
1649         }
1650
1651         if (!slave_ops->ndo_set_mac_address ||
1652             slave_dev->type == ARPHRD_INFINIBAND) {
1653                 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1654                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1655                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1656                         if (!bond_has_slaves(bond)) {
1657                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1658                                 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1659                         } else {
1660                                 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1661                                 slave_err(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1662                                 res = -EOPNOTSUPP;
1663                                 goto err_undo_flags;
1664                         }
1665                 }
1666         }
1667
1668         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1669
1670         /* If this is the first slave, then we need to set the master's hardware
1671          * address to be the same as the slave's.
1672          */
1673         if (!bond_has_slaves(bond) &&
1674             bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1675                 res = bond_set_dev_addr(bond->dev, slave_dev);
1676                 if (res)
1677                         goto err_undo_flags;
1678         }
1679
1680         new_slave = bond_alloc_slave(bond);
1681         if (!new_slave) {
1682                 res = -ENOMEM;
1683                 goto err_undo_flags;
1684         }
1685
1686         new_slave->bond = bond;
1687         new_slave->dev = slave_dev;
1688         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1689          * is set via sysfs or module option if desired.
1690          */
1691         new_slave->queue_id = 0;
1692
1693         /* Save slave's original mtu and then set it to match the bond */
1694         new_slave->original_mtu = slave_dev->mtu;
1695         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1696         if (res) {
1697                 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1698                 goto err_free;
1699         }
1700
1701         /* Save slave's original ("permanent") mac address for modes
1702          * that need it, and for restoring it upon release, and then
1703          * set it to the master's address
1704          */
1705         bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1706                           slave_dev->addr_len);
1707
1708         if (!bond->params.fail_over_mac ||
1709             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1710                 /* Set slave to master's mac address.  The application already
1711                  * set the master's mac address to that of the first slave
1712                  */
1713                 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1714                 ss.ss_family = slave_dev->type;
1715                 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1716                                           extack);
1717                 if (res) {
1718                         slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1719                         goto err_restore_mtu;
1720                 }
1721         }
1722
1723         /* set slave flag before open to prevent IPv6 addrconf */
1724         slave_dev->flags |= IFF_SLAVE;
1725
1726         /* open the slave since the application closed it */
1727         res = dev_open(slave_dev, extack);
1728         if (res) {
1729                 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1730                 goto err_restore_mac;
1731         }
1732
1733         slave_dev->priv_flags |= IFF_BONDING;
1734         /* initialize slave stats */
1735         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1736
1737         if (bond_is_lb(bond)) {
1738                 /* bond_alb_init_slave() must be called before all other stages since
1739                  * it might fail and we do not want to have to undo everything
1740                  */
1741                 res = bond_alb_init_slave(bond, new_slave);
1742                 if (res)
1743                         goto err_close;
1744         }
1745
1746         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1747         if (res) {
1748                 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1749                 goto err_close;
1750         }
1751
1752         prev_slave = bond_last_slave(bond);
1753
1754         new_slave->delay = 0;
1755         new_slave->link_failure_count = 0;
1756
1757         if (bond_update_speed_duplex(new_slave) &&
1758             bond_needs_speed_duplex(bond))
1759                 new_slave->link = BOND_LINK_DOWN;
1760
1761         new_slave->last_rx = jiffies -
1762                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1763         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1764                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1765
1766         if (bond->params.miimon && !bond->params.use_carrier) {
1767                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1768
1769                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1770                         /* miimon is set but a bonded network driver
1771                          * does not support ETHTOOL/MII and
1772                          * arp_interval is not set.  Note: if
1773                          * use_carrier is enabled, we will never go
1774                          * here (because netif_carrier is always
1775                          * supported); thus, we don't need to change
1776                          * the messages for netif_carrier.
1777                          */
1778                         slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n");
1779                 } else if (link_reporting == -1) {
1780                         /* unable get link status using mii/ethtool */
1781                         slave_warn(bond_dev, slave_dev, "can't get link status from slave; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n");
1782                 }
1783         }
1784
1785         /* check for initial state */
1786         new_slave->link = BOND_LINK_NOCHANGE;
1787         if (bond->params.miimon) {
1788                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1789                         if (bond->params.updelay) {
1790                                 bond_set_slave_link_state(new_slave,
1791                                                           BOND_LINK_BACK,
1792                                                           BOND_SLAVE_NOTIFY_NOW);
1793                                 new_slave->delay = bond->params.updelay;
1794                         } else {
1795                                 bond_set_slave_link_state(new_slave,
1796                                                           BOND_LINK_UP,
1797                                                           BOND_SLAVE_NOTIFY_NOW);
1798                         }
1799                 } else {
1800                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1801                                                   BOND_SLAVE_NOTIFY_NOW);
1802                 }
1803         } else if (bond->params.arp_interval) {
1804                 bond_set_slave_link_state(new_slave,
1805                                           (netif_carrier_ok(slave_dev) ?
1806                                           BOND_LINK_UP : BOND_LINK_DOWN),
1807                                           BOND_SLAVE_NOTIFY_NOW);
1808         } else {
1809                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1810                                           BOND_SLAVE_NOTIFY_NOW);
1811         }
1812
1813         if (new_slave->link != BOND_LINK_DOWN)
1814                 new_slave->last_link_up = jiffies;
1815         slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1816                   new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1817                   (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1818
1819         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1820                 /* if there is a primary slave, remember it */
1821                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1822                         rcu_assign_pointer(bond->primary_slave, new_slave);
1823                         bond->force_primary = true;
1824                 }
1825         }
1826
1827         switch (BOND_MODE(bond)) {
1828         case BOND_MODE_ACTIVEBACKUP:
1829                 bond_set_slave_inactive_flags(new_slave,
1830                                               BOND_SLAVE_NOTIFY_NOW);
1831                 break;
1832         case BOND_MODE_8023AD:
1833                 /* in 802.3ad mode, the internal mechanism
1834                  * will activate the slaves in the selected
1835                  * aggregator
1836                  */
1837                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1838                 /* if this is the first slave */
1839                 if (!prev_slave) {
1840                         SLAVE_AD_INFO(new_slave)->id = 1;
1841                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1842                          * can be called only after the mac address of the bond is set
1843                          */
1844                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1845                 } else {
1846                         SLAVE_AD_INFO(new_slave)->id =
1847                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1848                 }
1849
1850                 bond_3ad_bind_slave(new_slave);
1851                 break;
1852         case BOND_MODE_TLB:
1853         case BOND_MODE_ALB:
1854                 bond_set_active_slave(new_slave);
1855                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1856                 break;
1857         default:
1858                 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1859
1860                 /* always active in trunk mode */
1861                 bond_set_active_slave(new_slave);
1862
1863                 /* In trunking mode there is little meaning to curr_active_slave
1864                  * anyway (it holds no special properties of the bond device),
1865                  * so we can change it without calling change_active_interface()
1866                  */
1867                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1868                     new_slave->link == BOND_LINK_UP)
1869                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1870
1871                 break;
1872         } /* switch(bond_mode) */
1873
1874 #ifdef CONFIG_NET_POLL_CONTROLLER
1875         if (bond->dev->npinfo) {
1876                 if (slave_enable_netpoll(new_slave)) {
1877                         slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1878                         res = -EBUSY;
1879                         goto err_detach;
1880                 }
1881         }
1882 #endif
1883
1884         if (!(bond_dev->features & NETIF_F_LRO))
1885                 dev_disable_lro(slave_dev);
1886
1887         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1888                                          new_slave);
1889         if (res) {
1890                 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1891                 goto err_detach;
1892         }
1893
1894         res = bond_master_upper_dev_link(bond, new_slave, extack);
1895         if (res) {
1896                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1897                 goto err_unregister;
1898         }
1899
1900         res = bond_sysfs_slave_add(new_slave);
1901         if (res) {
1902                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1903                 goto err_upper_unlink;
1904         }
1905
1906         /* If the mode uses primary, then the following is handled by
1907          * bond_change_active_slave().
1908          */
1909         if (!bond_uses_primary(bond)) {
1910                 /* set promiscuity level to new slave */
1911                 if (bond_dev->flags & IFF_PROMISC) {
1912                         res = dev_set_promiscuity(slave_dev, 1);
1913                         if (res)
1914                                 goto err_sysfs_del;
1915                 }
1916
1917                 /* set allmulti level to new slave */
1918                 if (bond_dev->flags & IFF_ALLMULTI) {
1919                         res = dev_set_allmulti(slave_dev, 1);
1920                         if (res) {
1921                                 if (bond_dev->flags & IFF_PROMISC)
1922                                         dev_set_promiscuity(slave_dev, -1);
1923                                 goto err_sysfs_del;
1924                         }
1925                 }
1926
1927                 netif_addr_lock_bh(bond_dev);
1928                 dev_mc_sync_multiple(slave_dev, bond_dev);
1929                 dev_uc_sync_multiple(slave_dev, bond_dev);
1930                 netif_addr_unlock_bh(bond_dev);
1931
1932                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1933                         /* add lacpdu mc addr to mc list */
1934                         u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1935
1936                         dev_mc_add(slave_dev, lacpdu_multicast);
1937                 }
1938         }
1939
1940         bond->slave_cnt++;
1941         bond_compute_features(bond);
1942         bond_set_carrier(bond);
1943
1944         if (bond_uses_primary(bond)) {
1945                 block_netpoll_tx();
1946                 bond_select_active_slave(bond);
1947                 unblock_netpoll_tx();
1948         }
1949
1950         if (bond_mode_can_use_xmit_hash(bond))
1951                 bond_update_slave_arr(bond, NULL);
1952
1953
1954         slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
1955                    bond_is_active_slave(new_slave) ? "an active" : "a backup",
1956                    new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1957
1958         /* enslave is successful */
1959         bond_queue_slave_event(new_slave);
1960         return 0;
1961
1962 /* Undo stages on error */
1963 err_sysfs_del:
1964         bond_sysfs_slave_del(new_slave);
1965
1966 err_upper_unlink:
1967         bond_upper_dev_unlink(bond, new_slave);
1968
1969 err_unregister:
1970         netdev_rx_handler_unregister(slave_dev);
1971
1972 err_detach:
1973         vlan_vids_del_by_dev(slave_dev, bond_dev);
1974         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1975                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1976         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1977                 block_netpoll_tx();
1978                 bond_change_active_slave(bond, NULL);
1979                 bond_select_active_slave(bond);
1980                 unblock_netpoll_tx();
1981         }
1982         /* either primary_slave or curr_active_slave might've changed */
1983         synchronize_rcu();
1984         slave_disable_netpoll(new_slave);
1985
1986 err_close:
1987         if (!netif_is_bond_master(slave_dev))
1988                 slave_dev->priv_flags &= ~IFF_BONDING;
1989         dev_close(slave_dev);
1990
1991 err_restore_mac:
1992         slave_dev->flags &= ~IFF_SLAVE;
1993         if (!bond->params.fail_over_mac ||
1994             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1995                 /* XXX TODO - fom follow mode needs to change master's
1996                  * MAC if this slave's MAC is in use by the bond, or at
1997                  * least print a warning.
1998                  */
1999                 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2000                                   new_slave->dev->addr_len);
2001                 ss.ss_family = slave_dev->type;
2002                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2003         }
2004
2005 err_restore_mtu:
2006         dev_set_mtu(slave_dev, new_slave->original_mtu);
2007
2008 err_free:
2009         bond_free_slave(new_slave);
2010
2011 err_undo_flags:
2012         /* Enslave of first slave has failed and we need to fix master's mac */
2013         if (!bond_has_slaves(bond)) {
2014                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
2015                                             slave_dev->dev_addr))
2016                         eth_hw_addr_random(bond_dev);
2017                 if (bond_dev->type != ARPHRD_ETHER) {
2018                         dev_close(bond_dev);
2019                         ether_setup(bond_dev);
2020                         bond_dev->flags |= IFF_MASTER;
2021                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2022                 }
2023         }
2024
2025         return res;
2026 }
2027
2028 /* Try to release the slave device <slave> from the bond device <master>
2029  * It is legal to access curr_active_slave without a lock because all the function
2030  * is RTNL-locked. If "all" is true it means that the function is being called
2031  * while destroying a bond interface and all slaves are being released.
2032  *
2033  * The rules for slave state should be:
2034  *   for Active/Backup:
2035  *     Active stays on all backups go down
2036  *   for Bonded connections:
2037  *     The first up interface should be left on and all others downed.
2038  */
2039 static int __bond_release_one(struct net_device *bond_dev,
2040                               struct net_device *slave_dev,
2041                               bool all, bool unregister)
2042 {
2043         struct bonding *bond = netdev_priv(bond_dev);
2044         struct slave *slave, *oldcurrent;
2045         struct sockaddr_storage ss;
2046         int old_flags = bond_dev->flags;
2047         netdev_features_t old_features = bond_dev->features;
2048
2049         /* slave is not a slave or master is not master of this slave */
2050         if (!(slave_dev->flags & IFF_SLAVE) ||
2051             !netdev_has_upper_dev(slave_dev, bond_dev)) {
2052                 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2053                 return -EINVAL;
2054         }
2055
2056         block_netpoll_tx();
2057
2058         slave = bond_get_slave_by_dev(bond, slave_dev);
2059         if (!slave) {
2060                 /* not a slave of this bond */
2061                 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2062                 unblock_netpoll_tx();
2063                 return -EINVAL;
2064         }
2065
2066         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2067
2068         bond_sysfs_slave_del(slave);
2069
2070         /* recompute stats just before removing the slave */
2071         bond_get_stats(bond->dev, &bond->bond_stats);
2072
2073         bond_upper_dev_unlink(bond, slave);
2074         /* unregister rx_handler early so bond_handle_frame wouldn't be called
2075          * for this slave anymore.
2076          */
2077         netdev_rx_handler_unregister(slave_dev);
2078
2079         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2080                 bond_3ad_unbind_slave(slave);
2081
2082         if (bond_mode_can_use_xmit_hash(bond))
2083                 bond_update_slave_arr(bond, slave);
2084
2085         slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2086                     bond_is_active_slave(slave) ? "active" : "backup");
2087
2088         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2089
2090         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2091
2092         if (!all && (!bond->params.fail_over_mac ||
2093                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2094                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2095                     bond_has_slaves(bond))
2096                         slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n",
2097                                    slave->perm_hwaddr);
2098         }
2099
2100         if (rtnl_dereference(bond->primary_slave) == slave)
2101                 RCU_INIT_POINTER(bond->primary_slave, NULL);
2102
2103         if (oldcurrent == slave)
2104                 bond_change_active_slave(bond, NULL);
2105
2106         if (bond_is_lb(bond)) {
2107                 /* Must be called only after the slave has been
2108                  * detached from the list and the curr_active_slave
2109                  * has been cleared (if our_slave == old_current),
2110                  * but before a new active slave is selected.
2111                  */
2112                 bond_alb_deinit_slave(bond, slave);
2113         }
2114
2115         if (all) {
2116                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2117         } else if (oldcurrent == slave) {
2118                 /* Note that we hold RTNL over this sequence, so there
2119                  * is no concern that another slave add/remove event
2120                  * will interfere.
2121                  */
2122                 bond_select_active_slave(bond);
2123         }
2124
2125         if (!bond_has_slaves(bond)) {
2126                 bond_set_carrier(bond);
2127                 eth_hw_addr_random(bond_dev);
2128         }
2129
2130         unblock_netpoll_tx();
2131         synchronize_rcu();
2132         bond->slave_cnt--;
2133
2134         if (!bond_has_slaves(bond)) {
2135                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2136                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2137         }
2138
2139         bond_compute_features(bond);
2140         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2141             (old_features & NETIF_F_VLAN_CHALLENGED))
2142                 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2143
2144         vlan_vids_del_by_dev(slave_dev, bond_dev);
2145
2146         /* If the mode uses primary, then this case was handled above by
2147          * bond_change_active_slave(..., NULL)
2148          */
2149         if (!bond_uses_primary(bond)) {
2150                 /* unset promiscuity level from slave
2151                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
2152                  * of the IFF_PROMISC flag in the bond_dev, but we need the
2153                  * value of that flag before that change, as that was the value
2154                  * when this slave was attached, so we cache at the start of the
2155                  * function and use it here. Same goes for ALLMULTI below
2156                  */
2157                 if (old_flags & IFF_PROMISC)
2158                         dev_set_promiscuity(slave_dev, -1);
2159
2160                 /* unset allmulti level from slave */
2161                 if (old_flags & IFF_ALLMULTI)
2162                         dev_set_allmulti(slave_dev, -1);
2163
2164                 bond_hw_addr_flush(bond_dev, slave_dev);
2165         }
2166
2167         slave_disable_netpoll(slave);
2168
2169         /* close slave before restoring its mac address */
2170         dev_close(slave_dev);
2171
2172         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2173             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2174                 /* restore original ("permanent") mac address */
2175                 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2176                                   slave->dev->addr_len);
2177                 ss.ss_family = slave_dev->type;
2178                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2179         }
2180
2181         if (unregister)
2182                 __dev_set_mtu(slave_dev, slave->original_mtu);
2183         else
2184                 dev_set_mtu(slave_dev, slave->original_mtu);
2185
2186         if (!netif_is_bond_master(slave_dev))
2187                 slave_dev->priv_flags &= ~IFF_BONDING;
2188
2189         bond_free_slave(slave);
2190
2191         return 0;
2192 }
2193
2194 /* A wrapper used because of ndo_del_link */
2195 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2196 {
2197         return __bond_release_one(bond_dev, slave_dev, false, false);
2198 }
2199
2200 /* First release a slave and then destroy the bond if no more slaves are left.
2201  * Must be under rtnl_lock when this function is called.
2202  */
2203 static int bond_release_and_destroy(struct net_device *bond_dev,
2204                                     struct net_device *slave_dev)
2205 {
2206         struct bonding *bond = netdev_priv(bond_dev);
2207         int ret;
2208
2209         ret = __bond_release_one(bond_dev, slave_dev, false, true);
2210         if (ret == 0 && !bond_has_slaves(bond) &&
2211             bond_dev->reg_state != NETREG_UNREGISTERING) {
2212                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2213                 netdev_info(bond_dev, "Destroying bond\n");
2214                 bond_remove_proc_entry(bond);
2215                 unregister_netdevice(bond_dev);
2216         }
2217         return ret;
2218 }
2219
2220 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2221 {
2222         struct bonding *bond = netdev_priv(bond_dev);
2223         bond_fill_ifbond(bond, info);
2224 }
2225
2226 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2227 {
2228         struct bonding *bond = netdev_priv(bond_dev);
2229         struct list_head *iter;
2230         int i = 0, res = -ENODEV;
2231         struct slave *slave;
2232
2233         bond_for_each_slave(bond, slave, iter) {
2234                 if (i++ == (int)info->slave_id) {
2235                         res = 0;
2236                         bond_fill_ifslave(slave, info);
2237                         break;
2238                 }
2239         }
2240
2241         return res;
2242 }
2243
2244 /*-------------------------------- Monitoring -------------------------------*/
2245
2246 /* called with rcu_read_lock() */
2247 static int bond_miimon_inspect(struct bonding *bond)
2248 {
2249         int link_state, commit = 0;
2250         struct list_head *iter;
2251         struct slave *slave;
2252         bool ignore_updelay;
2253
2254         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2255
2256         bond_for_each_slave_rcu(bond, slave, iter) {
2257                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2258
2259                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2260
2261                 switch (slave->link) {
2262                 case BOND_LINK_UP:
2263                         if (link_state)
2264                                 continue;
2265
2266                         bond_propose_link_state(slave, BOND_LINK_FAIL);
2267                         commit++;
2268                         slave->delay = bond->params.downdelay;
2269                         if (slave->delay) {
2270                                 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2271                                            (BOND_MODE(bond) ==
2272                                             BOND_MODE_ACTIVEBACKUP) ?
2273                                             (bond_is_active_slave(slave) ?
2274                                              "active " : "backup ") : "",
2275                                            bond->params.downdelay * bond->params.miimon);
2276                         }
2277                         fallthrough;
2278                 case BOND_LINK_FAIL:
2279                         if (link_state) {
2280                                 /* recovered before downdelay expired */
2281                                 bond_propose_link_state(slave, BOND_LINK_UP);
2282                                 slave->last_link_up = jiffies;
2283                                 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2284                                            (bond->params.downdelay - slave->delay) *
2285                                            bond->params.miimon);
2286                                 commit++;
2287                                 continue;
2288                         }
2289
2290                         if (slave->delay <= 0) {
2291                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2292                                 commit++;
2293                                 continue;
2294                         }
2295
2296                         slave->delay--;
2297                         break;
2298
2299                 case BOND_LINK_DOWN:
2300                         if (!link_state)
2301                                 continue;
2302
2303                         bond_propose_link_state(slave, BOND_LINK_BACK);
2304                         commit++;
2305                         slave->delay = bond->params.updelay;
2306
2307                         if (slave->delay) {
2308                                 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2309                                            ignore_updelay ? 0 :
2310                                            bond->params.updelay *
2311                                            bond->params.miimon);
2312                         }
2313                         fallthrough;
2314                 case BOND_LINK_BACK:
2315                         if (!link_state) {
2316                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2317                                 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2318                                            (bond->params.updelay - slave->delay) *
2319                                            bond->params.miimon);
2320                                 commit++;
2321                                 continue;
2322                         }
2323
2324                         if (ignore_updelay)
2325                                 slave->delay = 0;
2326
2327                         if (slave->delay <= 0) {
2328                                 bond_propose_link_state(slave, BOND_LINK_UP);
2329                                 commit++;
2330                                 ignore_updelay = false;
2331                                 continue;
2332                         }
2333
2334                         slave->delay--;
2335                         break;
2336                 }
2337         }
2338
2339         return commit;
2340 }
2341
2342 static void bond_miimon_link_change(struct bonding *bond,
2343                                     struct slave *slave,
2344                                     char link)
2345 {
2346         switch (BOND_MODE(bond)) {
2347         case BOND_MODE_8023AD:
2348                 bond_3ad_handle_link_change(slave, link);
2349                 break;
2350         case BOND_MODE_TLB:
2351         case BOND_MODE_ALB:
2352                 bond_alb_handle_link_change(bond, slave, link);
2353                 break;
2354         case BOND_MODE_XOR:
2355                 bond_update_slave_arr(bond, NULL);
2356                 break;
2357         }
2358 }
2359
2360 static void bond_miimon_commit(struct bonding *bond)
2361 {
2362         struct list_head *iter;
2363         struct slave *slave, *primary;
2364
2365         bond_for_each_slave(bond, slave, iter) {
2366                 switch (slave->link_new_state) {
2367                 case BOND_LINK_NOCHANGE:
2368                         /* For 802.3ad mode, check current slave speed and
2369                          * duplex again in case its port was disabled after
2370                          * invalid speed/duplex reporting but recovered before
2371                          * link monitoring could make a decision on the actual
2372                          * link status
2373                          */
2374                         if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2375                             slave->link == BOND_LINK_UP)
2376                                 bond_3ad_adapter_speed_duplex_changed(slave);
2377                         continue;
2378
2379                 case BOND_LINK_UP:
2380                         if (bond_update_speed_duplex(slave) &&
2381                             bond_needs_speed_duplex(bond)) {
2382                                 slave->link = BOND_LINK_DOWN;
2383                                 if (net_ratelimit())
2384                                         slave_warn(bond->dev, slave->dev,
2385                                                    "failed to get link speed/duplex\n");
2386                                 continue;
2387                         }
2388                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2389                                                   BOND_SLAVE_NOTIFY_NOW);
2390                         slave->last_link_up = jiffies;
2391
2392                         primary = rtnl_dereference(bond->primary_slave);
2393                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2394                                 /* prevent it from being the active one */
2395                                 bond_set_backup_slave(slave);
2396                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2397                                 /* make it immediately active */
2398                                 bond_set_active_slave(slave);
2399                         }
2400
2401                         slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2402                                    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2403                                    slave->duplex ? "full" : "half");
2404
2405                         bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2406
2407                         if (!bond->curr_active_slave || slave == primary)
2408                                 goto do_failover;
2409
2410                         continue;
2411
2412                 case BOND_LINK_DOWN:
2413                         if (slave->link_failure_count < UINT_MAX)
2414                                 slave->link_failure_count++;
2415
2416                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2417                                                   BOND_SLAVE_NOTIFY_NOW);
2418
2419                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2420                             BOND_MODE(bond) == BOND_MODE_8023AD)
2421                                 bond_set_slave_inactive_flags(slave,
2422                                                               BOND_SLAVE_NOTIFY_NOW);
2423
2424                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2425
2426                         bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2427
2428                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2429                                 goto do_failover;
2430
2431                         continue;
2432
2433                 default:
2434                         slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2435                                   slave->link_new_state);
2436                         bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2437
2438                         continue;
2439                 }
2440
2441 do_failover:
2442                 block_netpoll_tx();
2443                 bond_select_active_slave(bond);
2444                 unblock_netpoll_tx();
2445         }
2446
2447         bond_set_carrier(bond);
2448 }
2449
2450 /* bond_mii_monitor
2451  *
2452  * Really a wrapper that splits the mii monitor into two phases: an
2453  * inspection, then (if inspection indicates something needs to be done)
2454  * an acquisition of appropriate locks followed by a commit phase to
2455  * implement whatever link state changes are indicated.
2456  */
2457 static void bond_mii_monitor(struct work_struct *work)
2458 {
2459         struct bonding *bond = container_of(work, struct bonding,
2460                                             mii_work.work);
2461         bool should_notify_peers = false;
2462         bool commit;
2463         unsigned long delay;
2464         struct slave *slave;
2465         struct list_head *iter;
2466
2467         delay = msecs_to_jiffies(bond->params.miimon);
2468
2469         if (!bond_has_slaves(bond))
2470                 goto re_arm;
2471
2472         rcu_read_lock();
2473         should_notify_peers = bond_should_notify_peers(bond);
2474         commit = !!bond_miimon_inspect(bond);
2475         if (bond->send_peer_notif) {
2476                 rcu_read_unlock();
2477                 if (rtnl_trylock()) {
2478                         bond->send_peer_notif--;
2479                         rtnl_unlock();
2480                 }
2481         } else {
2482                 rcu_read_unlock();
2483         }
2484
2485         if (commit) {
2486                 /* Race avoidance with bond_close cancel of workqueue */
2487                 if (!rtnl_trylock()) {
2488                         delay = 1;
2489                         should_notify_peers = false;
2490                         goto re_arm;
2491                 }
2492
2493                 bond_for_each_slave(bond, slave, iter) {
2494                         bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2495                 }
2496                 bond_miimon_commit(bond);
2497
2498                 rtnl_unlock();  /* might sleep, hold no other locks */
2499         }
2500
2501 re_arm:
2502         if (bond->params.miimon)
2503                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2504
2505         if (should_notify_peers) {
2506                 if (!rtnl_trylock())
2507                         return;
2508                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2509                 rtnl_unlock();
2510         }
2511 }
2512
2513 static int bond_upper_dev_walk(struct net_device *upper, void *data)
2514 {
2515         __be32 ip = *((__be32 *)data);
2516
2517         return ip == bond_confirm_addr(upper, 0, ip);
2518 }
2519
2520 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2521 {
2522         bool ret = false;
2523
2524         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2525                 return true;
2526
2527         rcu_read_lock();
2528         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2529                 ret = true;
2530         rcu_read_unlock();
2531
2532         return ret;
2533 }
2534
2535 /* We go to the (large) trouble of VLAN tagging ARP frames because
2536  * switches in VLAN mode (especially if ports are configured as
2537  * "native" to a VLAN) might not pass non-tagged frames.
2538  */
2539 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2540                           __be32 src_ip, struct bond_vlan_tag *tags)
2541 {
2542         struct sk_buff *skb;
2543         struct bond_vlan_tag *outer_tag = tags;
2544         struct net_device *slave_dev = slave->dev;
2545         struct net_device *bond_dev = slave->bond->dev;
2546
2547         slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2548                   arp_op, &dest_ip, &src_ip);
2549
2550         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2551                          NULL, slave_dev->dev_addr, NULL);
2552
2553         if (!skb) {
2554                 net_err_ratelimited("ARP packet allocation failed\n");
2555                 return;
2556         }
2557
2558         if (!tags || tags->vlan_proto == VLAN_N_VID)
2559                 goto xmit;
2560
2561         tags++;
2562
2563         /* Go through all the tags backwards and add them to the packet */
2564         while (tags->vlan_proto != VLAN_N_VID) {
2565                 if (!tags->vlan_id) {
2566                         tags++;
2567                         continue;
2568                 }
2569
2570                 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2571                           ntohs(outer_tag->vlan_proto), tags->vlan_id);
2572                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2573                                                 tags->vlan_id);
2574                 if (!skb) {
2575                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2576                         return;
2577                 }
2578
2579                 tags++;
2580         }
2581         /* Set the outer tag */
2582         if (outer_tag->vlan_id) {
2583                 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2584                           ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2585                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2586                                        outer_tag->vlan_id);
2587         }
2588
2589 xmit:
2590         arp_xmit(skb);
2591 }
2592
2593 /* Validate the device path between the @start_dev and the @end_dev.
2594  * The path is valid if the @end_dev is reachable through device
2595  * stacking.
2596  * When the path is validated, collect any vlan information in the
2597  * path.
2598  */
2599 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2600                                               struct net_device *end_dev,
2601                                               int level)
2602 {
2603         struct bond_vlan_tag *tags;
2604         struct net_device *upper;
2605         struct list_head  *iter;
2606
2607         if (start_dev == end_dev) {
2608                 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2609                 if (!tags)
2610                         return ERR_PTR(-ENOMEM);
2611                 tags[level].vlan_proto = VLAN_N_VID;
2612                 return tags;
2613         }
2614
2615         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2616                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2617                 if (IS_ERR_OR_NULL(tags)) {
2618                         if (IS_ERR(tags))
2619                                 return tags;
2620                         continue;
2621                 }
2622                 if (is_vlan_dev(upper)) {
2623                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2624                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2625                 }
2626
2627                 return tags;
2628         }
2629
2630         return NULL;
2631 }
2632
2633 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2634 {
2635         struct rtable *rt;
2636         struct bond_vlan_tag *tags;
2637         __be32 *targets = bond->params.arp_targets, addr;
2638         int i;
2639
2640         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2641                 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2642                           __func__, &targets[i]);
2643                 tags = NULL;
2644
2645                 /* Find out through which dev should the packet go */
2646                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2647                                      RTO_ONLINK, 0);
2648                 if (IS_ERR(rt)) {
2649                         /* there's no route to target - try to send arp
2650                          * probe to generate any traffic (arp_validate=0)
2651                          */
2652                         if (bond->params.arp_validate)
2653                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2654                                                      bond->dev->name,
2655                                                      &targets[i]);
2656                         bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2657                                       0, tags);
2658                         continue;
2659                 }
2660
2661                 /* bond device itself */
2662                 if (rt->dst.dev == bond->dev)
2663                         goto found;
2664
2665                 rcu_read_lock();
2666                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2667                 rcu_read_unlock();
2668
2669                 if (!IS_ERR_OR_NULL(tags))
2670                         goto found;
2671
2672                 /* Not our device - skip */
2673                 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2674                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2675
2676                 ip_rt_put(rt);
2677                 continue;
2678
2679 found:
2680                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2681                 ip_rt_put(rt);
2682                 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2683                 kfree(tags);
2684         }
2685 }
2686
2687 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2688 {
2689         int i;
2690
2691         if (!sip || !bond_has_this_ip(bond, tip)) {
2692                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2693                            __func__, &sip, &tip);
2694                 return;
2695         }
2696
2697         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2698         if (i == -1) {
2699                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2700                            __func__, &sip);
2701                 return;
2702         }
2703         slave->last_rx = jiffies;
2704         slave->target_last_arp_rx[i] = jiffies;
2705 }
2706
2707 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2708                  struct slave *slave)
2709 {
2710         struct arphdr *arp = (struct arphdr *)skb->data;
2711         struct slave *curr_active_slave, *curr_arp_slave;
2712         unsigned char *arp_ptr;
2713         __be32 sip, tip;
2714         int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2715         unsigned int alen;
2716
2717         if (!slave_do_arp_validate(bond, slave)) {
2718                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2719                     !slave_do_arp_validate_only(bond))
2720                         slave->last_rx = jiffies;
2721                 return RX_HANDLER_ANOTHER;
2722         } else if (!is_arp) {
2723                 return RX_HANDLER_ANOTHER;
2724         }
2725
2726         alen = arp_hdr_len(bond->dev);
2727
2728         slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2729                    __func__, skb->dev->name);
2730
2731         if (alen > skb_headlen(skb)) {
2732                 arp = kmalloc(alen, GFP_ATOMIC);
2733                 if (!arp)
2734                         goto out_unlock;
2735                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2736                         goto out_unlock;
2737         }
2738
2739         if (arp->ar_hln != bond->dev->addr_len ||
2740             skb->pkt_type == PACKET_OTHERHOST ||
2741             skb->pkt_type == PACKET_LOOPBACK ||
2742             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2743             arp->ar_pro != htons(ETH_P_IP) ||
2744             arp->ar_pln != 4)
2745                 goto out_unlock;
2746
2747         arp_ptr = (unsigned char *)(arp + 1);
2748         arp_ptr += bond->dev->addr_len;
2749         memcpy(&sip, arp_ptr, 4);
2750         arp_ptr += 4 + bond->dev->addr_len;
2751         memcpy(&tip, arp_ptr, 4);
2752
2753         slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2754                   __func__, slave->dev->name, bond_slave_state(slave),
2755                   bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2756                   &sip, &tip);
2757
2758         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2759         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2760
2761         /* We 'trust' the received ARP enough to validate it if:
2762          *
2763          * (a) the slave receiving the ARP is active (which includes the
2764          * current ARP slave, if any), or
2765          *
2766          * (b) the receiving slave isn't active, but there is a currently
2767          * active slave and it received valid arp reply(s) after it became
2768          * the currently active slave, or
2769          *
2770          * (c) there is an ARP slave that sent an ARP during the prior ARP
2771          * interval, and we receive an ARP reply on any slave.  We accept
2772          * these because switch FDB update delays may deliver the ARP
2773          * reply to a slave other than the sender of the ARP request.
2774          *
2775          * Note: for (b), backup slaves are receiving the broadcast ARP
2776          * request, not a reply.  This request passes from the sending
2777          * slave through the L2 switch(es) to the receiving slave.  Since
2778          * this is checking the request, sip/tip are swapped for
2779          * validation.
2780          *
2781          * This is done to avoid endless looping when we can't reach the
2782          * arp_ip_target and fool ourselves with our own arp requests.
2783          */
2784         if (bond_is_active_slave(slave))
2785                 bond_validate_arp(bond, slave, sip, tip);
2786         else if (curr_active_slave &&
2787                  time_after(slave_last_rx(bond, curr_active_slave),
2788                             curr_active_slave->last_link_up))
2789                 bond_validate_arp(bond, slave, tip, sip);
2790         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2791                  bond_time_in_interval(bond,
2792                                        dev_trans_start(curr_arp_slave->dev), 1))
2793                 bond_validate_arp(bond, slave, sip, tip);
2794
2795 out_unlock:
2796         if (arp != (struct arphdr *)skb->data)
2797                 kfree(arp);
2798         return RX_HANDLER_ANOTHER;
2799 }
2800
2801 /* function to verify if we're in the arp_interval timeslice, returns true if
2802  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2803  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2804  */
2805 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2806                                   int mod)
2807 {
2808         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2809
2810         return time_in_range(jiffies,
2811                              last_act - delta_in_ticks,
2812                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2813 }
2814
2815 /* This function is called regularly to monitor each slave's link
2816  * ensuring that traffic is being sent and received when arp monitoring
2817  * is used in load-balancing mode. if the adapter has been dormant, then an
2818  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2819  * arp monitoring in active backup mode.
2820  */
2821 static void bond_loadbalance_arp_mon(struct bonding *bond)
2822 {
2823         struct slave *slave, *oldcurrent;
2824         struct list_head *iter;
2825         int do_failover = 0, slave_state_changed = 0;
2826
2827         if (!bond_has_slaves(bond))
2828                 goto re_arm;
2829
2830         rcu_read_lock();
2831
2832         oldcurrent = rcu_dereference(bond->curr_active_slave);
2833         /* see if any of the previous devices are up now (i.e. they have
2834          * xmt and rcv traffic). the curr_active_slave does not come into
2835          * the picture unless it is null. also, slave->last_link_up is not
2836          * needed here because we send an arp on each slave and give a slave
2837          * as long as it needs to get the tx/rx within the delta.
2838          * TODO: what about up/down delay in arp mode? it wasn't here before
2839          *       so it can wait
2840          */
2841         bond_for_each_slave_rcu(bond, slave, iter) {
2842                 unsigned long trans_start = dev_trans_start(slave->dev);
2843
2844                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2845
2846                 if (slave->link != BOND_LINK_UP) {
2847                         if (bond_time_in_interval(bond, trans_start, 1) &&
2848                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2849
2850                                 bond_propose_link_state(slave, BOND_LINK_UP);
2851                                 slave_state_changed = 1;
2852
2853                                 /* primary_slave has no meaning in round-robin
2854                                  * mode. the window of a slave being up and
2855                                  * curr_active_slave being null after enslaving
2856                                  * is closed.
2857                                  */
2858                                 if (!oldcurrent) {
2859                                         slave_info(bond->dev, slave->dev, "link status definitely up\n");
2860                                         do_failover = 1;
2861                                 } else {
2862                                         slave_info(bond->dev, slave->dev, "interface is now up\n");
2863                                 }
2864                         }
2865                 } else {
2866                         /* slave->link == BOND_LINK_UP */
2867
2868                         /* not all switches will respond to an arp request
2869                          * when the source ip is 0, so don't take the link down
2870                          * if we don't know our ip yet
2871                          */
2872                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2873                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2874
2875                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2876                                 slave_state_changed = 1;
2877
2878                                 if (slave->link_failure_count < UINT_MAX)
2879                                         slave->link_failure_count++;
2880
2881                                 slave_info(bond->dev, slave->dev, "interface is now down\n");
2882
2883                                 if (slave == oldcurrent)
2884                                         do_failover = 1;
2885                         }
2886                 }
2887
2888                 /* note: if switch is in round-robin mode, all links
2889                  * must tx arp to ensure all links rx an arp - otherwise
2890                  * links may oscillate or not come up at all; if switch is
2891                  * in something like xor mode, there is nothing we can
2892                  * do - all replies will be rx'ed on same link causing slaves
2893                  * to be unstable during low/no traffic periods
2894                  */
2895                 if (bond_slave_is_up(slave))
2896                         bond_arp_send_all(bond, slave);
2897         }
2898
2899         rcu_read_unlock();
2900
2901         if (do_failover || slave_state_changed) {
2902                 if (!rtnl_trylock())
2903                         goto re_arm;
2904
2905                 bond_for_each_slave(bond, slave, iter) {
2906                         if (slave->link_new_state != BOND_LINK_NOCHANGE)
2907                                 slave->link = slave->link_new_state;
2908                 }
2909
2910                 if (slave_state_changed) {
2911                         bond_slave_state_change(bond);
2912                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2913                                 bond_update_slave_arr(bond, NULL);
2914                 }
2915                 if (do_failover) {
2916                         block_netpoll_tx();
2917                         bond_select_active_slave(bond);
2918                         unblock_netpoll_tx();
2919                 }
2920                 rtnl_unlock();
2921         }
2922
2923 re_arm:
2924         if (bond->params.arp_interval)
2925                 queue_delayed_work(bond->wq, &bond->arp_work,
2926                                    msecs_to_jiffies(bond->params.arp_interval));
2927 }
2928
2929 /* Called to inspect slaves for active-backup mode ARP monitor link state
2930  * changes.  Sets proposed link state in slaves to specify what action
2931  * should take place for the slave.  Returns 0 if no changes are found, >0
2932  * if changes to link states must be committed.
2933  *
2934  * Called with rcu_read_lock held.
2935  */
2936 static int bond_ab_arp_inspect(struct bonding *bond)
2937 {
2938         unsigned long trans_start, last_rx;
2939         struct list_head *iter;
2940         struct slave *slave;
2941         int commit = 0;
2942
2943         bond_for_each_slave_rcu(bond, slave, iter) {
2944                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2945                 last_rx = slave_last_rx(bond, slave);
2946
2947                 if (slave->link != BOND_LINK_UP) {
2948                         if (bond_time_in_interval(bond, last_rx, 1)) {
2949                                 bond_propose_link_state(slave, BOND_LINK_UP);
2950                                 commit++;
2951                         } else if (slave->link == BOND_LINK_BACK) {
2952                                 bond_propose_link_state(slave, BOND_LINK_FAIL);
2953                                 commit++;
2954                         }
2955                         continue;
2956                 }
2957
2958                 /* Give slaves 2*delta after being enslaved or made
2959                  * active.  This avoids bouncing, as the last receive
2960                  * times need a full ARP monitor cycle to be updated.
2961                  */
2962                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2963                         continue;
2964
2965                 /* Backup slave is down if:
2966                  * - No current_arp_slave AND
2967                  * - more than 3*delta since last receive AND
2968                  * - the bond has an IP address
2969                  *
2970                  * Note: a non-null current_arp_slave indicates
2971                  * the curr_active_slave went down and we are
2972                  * searching for a new one; under this condition
2973                  * we only take the curr_active_slave down - this
2974                  * gives each slave a chance to tx/rx traffic
2975                  * before being taken out
2976                  */
2977                 if (!bond_is_active_slave(slave) &&
2978                     !rcu_access_pointer(bond->current_arp_slave) &&
2979                     !bond_time_in_interval(bond, last_rx, 3)) {
2980                         bond_propose_link_state(slave, BOND_LINK_DOWN);
2981                         commit++;
2982                 }
2983
2984                 /* Active slave is down if:
2985                  * - more than 2*delta since transmitting OR
2986                  * - (more than 2*delta since receive AND
2987                  *    the bond has an IP address)
2988                  */
2989                 trans_start = dev_trans_start(slave->dev);
2990                 if (bond_is_active_slave(slave) &&
2991                     (!bond_time_in_interval(bond, trans_start, 2) ||
2992                      !bond_time_in_interval(bond, last_rx, 2))) {
2993                         bond_propose_link_state(slave, BOND_LINK_DOWN);
2994                         commit++;
2995                 }
2996         }
2997
2998         return commit;
2999 }
3000
3001 /* Called to commit link state changes noted by inspection step of
3002  * active-backup mode ARP monitor.
3003  *
3004  * Called with RTNL hold.
3005  */
3006 static void bond_ab_arp_commit(struct bonding *bond)
3007 {
3008         unsigned long trans_start;
3009         struct list_head *iter;
3010         struct slave *slave;
3011
3012         bond_for_each_slave(bond, slave, iter) {
3013                 switch (slave->link_new_state) {
3014                 case BOND_LINK_NOCHANGE:
3015                         continue;
3016
3017                 case BOND_LINK_UP:
3018                         trans_start = dev_trans_start(slave->dev);
3019                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
3020                             (!rtnl_dereference(bond->curr_active_slave) &&
3021                              bond_time_in_interval(bond, trans_start, 1))) {
3022                                 struct slave *current_arp_slave;
3023
3024                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3025                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
3026                                                           BOND_SLAVE_NOTIFY_NOW);
3027                                 if (current_arp_slave) {
3028                                         bond_set_slave_inactive_flags(
3029                                                 current_arp_slave,
3030                                                 BOND_SLAVE_NOTIFY_NOW);
3031                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3032                                 }
3033
3034                                 slave_info(bond->dev, slave->dev, "link status definitely up\n");
3035
3036                                 if (!rtnl_dereference(bond->curr_active_slave) ||
3037                                     slave == rtnl_dereference(bond->primary_slave))
3038                                         goto do_failover;
3039
3040                         }
3041
3042                         continue;
3043
3044                 case BOND_LINK_DOWN:
3045                         if (slave->link_failure_count < UINT_MAX)
3046                                 slave->link_failure_count++;
3047
3048                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3049                                                   BOND_SLAVE_NOTIFY_NOW);
3050                         bond_set_slave_inactive_flags(slave,
3051                                                       BOND_SLAVE_NOTIFY_NOW);
3052
3053                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3054
3055                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
3056                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3057                                 goto do_failover;
3058                         }
3059
3060                         continue;
3061
3062                 case BOND_LINK_FAIL:
3063                         bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3064                                                   BOND_SLAVE_NOTIFY_NOW);
3065                         bond_set_slave_inactive_flags(slave,
3066                                                       BOND_SLAVE_NOTIFY_NOW);
3067
3068                         /* A slave has just been enslaved and has become
3069                          * the current active slave.
3070                          */
3071                         if (rtnl_dereference(bond->curr_active_slave))
3072                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3073                         continue;
3074
3075                 default:
3076                         slave_err(bond->dev, slave->dev,
3077                                   "impossible: link_new_state %d on slave\n",
3078                                   slave->link_new_state);
3079                         continue;
3080                 }
3081
3082 do_failover:
3083                 block_netpoll_tx();
3084                 bond_select_active_slave(bond);
3085                 unblock_netpoll_tx();
3086         }
3087
3088         bond_set_carrier(bond);
3089 }
3090
3091 /* Send ARP probes for active-backup mode ARP monitor.
3092  *
3093  * Called with rcu_read_lock held.
3094  */
3095 static bool bond_ab_arp_probe(struct bonding *bond)
3096 {
3097         struct slave *slave, *before = NULL, *new_slave = NULL,
3098                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3099                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3100         struct list_head *iter;
3101         bool found = false;
3102         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3103
3104         if (curr_arp_slave && curr_active_slave)
3105                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3106                             curr_arp_slave->dev->name,
3107                             curr_active_slave->dev->name);
3108
3109         if (curr_active_slave) {
3110                 bond_arp_send_all(bond, curr_active_slave);
3111                 return should_notify_rtnl;
3112         }
3113
3114         /* if we don't have a curr_active_slave, search for the next available
3115          * backup slave from the current_arp_slave and make it the candidate
3116          * for becoming the curr_active_slave
3117          */
3118
3119         if (!curr_arp_slave) {
3120                 curr_arp_slave = bond_first_slave_rcu(bond);
3121                 if (!curr_arp_slave)
3122                         return should_notify_rtnl;
3123         }
3124
3125         bond_for_each_slave_rcu(bond, slave, iter) {
3126                 if (!found && !before && bond_slave_is_up(slave))
3127                         before = slave;
3128
3129                 if (found && !new_slave && bond_slave_is_up(slave))
3130                         new_slave = slave;
3131                 /* if the link state is up at this point, we
3132                  * mark it down - this can happen if we have
3133                  * simultaneous link failures and
3134                  * reselect_active_interface doesn't make this
3135                  * one the current slave so it is still marked
3136                  * up when it is actually down
3137                  */
3138                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3139                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3140                                                   BOND_SLAVE_NOTIFY_LATER);
3141                         if (slave->link_failure_count < UINT_MAX)
3142                                 slave->link_failure_count++;
3143
3144                         bond_set_slave_inactive_flags(slave,
3145                                                       BOND_SLAVE_NOTIFY_LATER);
3146
3147                         slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3148                 }
3149                 if (slave == curr_arp_slave)
3150                         found = true;
3151         }
3152
3153         if (!new_slave && before)
3154                 new_slave = before;
3155
3156         if (!new_slave)
3157                 goto check_state;
3158
3159         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3160                                   BOND_SLAVE_NOTIFY_LATER);
3161         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3162         bond_arp_send_all(bond, new_slave);
3163         new_slave->last_link_up = jiffies;
3164         rcu_assign_pointer(bond->current_arp_slave, new_slave);
3165
3166 check_state:
3167         bond_for_each_slave_rcu(bond, slave, iter) {
3168                 if (slave->should_notify || slave->should_notify_link) {
3169                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3170                         break;
3171                 }
3172         }
3173         return should_notify_rtnl;
3174 }
3175
3176 static void bond_activebackup_arp_mon(struct bonding *bond)
3177 {
3178         bool should_notify_peers = false;
3179         bool should_notify_rtnl = false;
3180         int delta_in_ticks;
3181
3182         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3183
3184         if (!bond_has_slaves(bond))
3185                 goto re_arm;
3186
3187         rcu_read_lock();
3188
3189         should_notify_peers = bond_should_notify_peers(bond);
3190
3191         if (bond_ab_arp_inspect(bond)) {
3192                 rcu_read_unlock();
3193
3194                 /* Race avoidance with bond_close flush of workqueue */
3195                 if (!rtnl_trylock()) {
3196                         delta_in_ticks = 1;
3197                         should_notify_peers = false;
3198                         goto re_arm;
3199                 }
3200
3201                 bond_ab_arp_commit(bond);
3202
3203                 rtnl_unlock();
3204                 rcu_read_lock();
3205         }
3206
3207         should_notify_rtnl = bond_ab_arp_probe(bond);
3208         rcu_read_unlock();
3209
3210 re_arm:
3211         if (bond->params.arp_interval)
3212                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3213
3214         if (should_notify_peers || should_notify_rtnl) {
3215                 if (!rtnl_trylock())
3216                         return;
3217
3218                 if (should_notify_peers)
3219                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3220                                                  bond->dev);
3221                 if (should_notify_rtnl) {
3222                         bond_slave_state_notify(bond);
3223                         bond_slave_link_notify(bond);
3224                 }
3225
3226                 rtnl_unlock();
3227         }
3228 }
3229
3230 static void bond_arp_monitor(struct work_struct *work)
3231 {
3232         struct bonding *bond = container_of(work, struct bonding,
3233                                             arp_work.work);
3234
3235         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3236                 bond_activebackup_arp_mon(bond);
3237         else
3238                 bond_loadbalance_arp_mon(bond);
3239 }
3240
3241 /*-------------------------- netdev event handling --------------------------*/
3242
3243 /* Change device name */
3244 static int bond_event_changename(struct bonding *bond)
3245 {
3246         bond_remove_proc_entry(bond);
3247         bond_create_proc_entry(bond);
3248
3249         bond_debug_reregister(bond);
3250
3251         return NOTIFY_DONE;
3252 }
3253
3254 static int bond_master_netdev_event(unsigned long event,
3255                                     struct net_device *bond_dev)
3256 {
3257         struct bonding *event_bond = netdev_priv(bond_dev);
3258
3259         netdev_dbg(bond_dev, "%s called\n", __func__);
3260
3261         switch (event) {
3262         case NETDEV_CHANGENAME:
3263                 return bond_event_changename(event_bond);
3264         case NETDEV_UNREGISTER:
3265                 bond_remove_proc_entry(event_bond);
3266                 break;
3267         case NETDEV_REGISTER:
3268                 bond_create_proc_entry(event_bond);
3269                 break;
3270         default:
3271                 break;
3272         }
3273
3274         return NOTIFY_DONE;
3275 }
3276
3277 static int bond_slave_netdev_event(unsigned long event,
3278                                    struct net_device *slave_dev)
3279 {
3280         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3281         struct bonding *bond;
3282         struct net_device *bond_dev;
3283
3284         /* A netdev event can be generated while enslaving a device
3285          * before netdev_rx_handler_register is called in which case
3286          * slave will be NULL
3287          */
3288         if (!slave) {
3289                 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3290                 return NOTIFY_DONE;
3291         }
3292
3293         bond_dev = slave->bond->dev;
3294         bond = slave->bond;
3295         primary = rtnl_dereference(bond->primary_slave);
3296
3297         slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3298
3299         switch (event) {
3300         case NETDEV_UNREGISTER:
3301                 if (bond_dev->type != ARPHRD_ETHER)
3302                         bond_release_and_destroy(bond_dev, slave_dev);
3303                 else
3304                         __bond_release_one(bond_dev, slave_dev, false, true);
3305                 break;
3306         case NETDEV_UP:
3307         case NETDEV_CHANGE:
3308                 /* For 802.3ad mode only:
3309                  * Getting invalid Speed/Duplex values here will put slave
3310                  * in weird state. Mark it as link-fail if the link was
3311                  * previously up or link-down if it hasn't yet come up, and
3312                  * let link-monitoring (miimon) set it right when correct
3313                  * speeds/duplex are available.
3314                  */
3315                 if (bond_update_speed_duplex(slave) &&
3316                     BOND_MODE(bond) == BOND_MODE_8023AD) {
3317                         if (slave->last_link_up)
3318                                 slave->link = BOND_LINK_FAIL;
3319                         else
3320                                 slave->link = BOND_LINK_DOWN;
3321                 }
3322
3323                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3324                         bond_3ad_adapter_speed_duplex_changed(slave);
3325                 fallthrough;
3326         case NETDEV_DOWN:
3327                 /* Refresh slave-array if applicable!
3328                  * If the setup does not use miimon or arpmon (mode-specific!),
3329                  * then these events will not cause the slave-array to be
3330                  * refreshed. This will cause xmit to use a slave that is not
3331                  * usable. Avoid such situation by refeshing the array at these
3332                  * events. If these (miimon/arpmon) parameters are configured
3333                  * then array gets refreshed twice and that should be fine!
3334                  */
3335                 if (bond_mode_can_use_xmit_hash(bond))
3336                         bond_update_slave_arr(bond, NULL);
3337                 break;
3338         case NETDEV_CHANGEMTU:
3339                 /* TODO: Should slaves be allowed to
3340                  * independently alter their MTU?  For
3341                  * an active-backup bond, slaves need
3342                  * not be the same type of device, so
3343                  * MTUs may vary.  For other modes,
3344                  * slaves arguably should have the
3345                  * same MTUs. To do this, we'd need to
3346                  * take over the slave's change_mtu
3347                  * function for the duration of their
3348                  * servitude.
3349                  */
3350                 break;
3351         case NETDEV_CHANGENAME:
3352                 /* we don't care if we don't have primary set */
3353                 if (!bond_uses_primary(bond) ||
3354                     !bond->params.primary[0])
3355                         break;
3356
3357                 if (slave == primary) {
3358                         /* slave's name changed - he's no longer primary */
3359                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3360                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3361                         /* we have a new primary slave */
3362                         rcu_assign_pointer(bond->primary_slave, slave);
3363                 } else { /* we didn't change primary - exit */
3364                         break;
3365                 }
3366
3367                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3368                             primary ? slave_dev->name : "none");
3369
3370                 block_netpoll_tx();
3371                 bond_select_active_slave(bond);
3372                 unblock_netpoll_tx();
3373                 break;
3374         case NETDEV_FEAT_CHANGE:
3375                 bond_compute_features(bond);
3376                 break;
3377         case NETDEV_RESEND_IGMP:
3378                 /* Propagate to master device */
3379                 call_netdevice_notifiers(event, slave->bond->dev);
3380                 break;
3381         default:
3382                 break;
3383         }
3384
3385         return NOTIFY_DONE;
3386 }
3387
3388 /* bond_netdev_event: handle netdev notifier chain events.
3389  *
3390  * This function receives events for the netdev chain.  The caller (an
3391  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3392  * locks for us to safely manipulate the slave devices (RTNL lock,
3393  * dev_probe_lock).
3394  */
3395 static int bond_netdev_event(struct notifier_block *this,
3396                              unsigned long event, void *ptr)
3397 {
3398         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3399
3400         netdev_dbg(event_dev, "%s received %s\n",
3401                    __func__, netdev_cmd_to_name(event));
3402
3403         if (!(event_dev->priv_flags & IFF_BONDING))
3404                 return NOTIFY_DONE;
3405
3406         if (event_dev->flags & IFF_MASTER) {
3407                 int ret;
3408
3409                 ret = bond_master_netdev_event(event, event_dev);
3410                 if (ret != NOTIFY_DONE)
3411                         return ret;
3412         }
3413
3414         if (event_dev->flags & IFF_SLAVE)
3415                 return bond_slave_netdev_event(event, event_dev);
3416
3417         return NOTIFY_DONE;
3418 }
3419
3420 static struct notifier_block bond_netdev_notifier = {
3421         .notifier_call = bond_netdev_event,
3422 };
3423
3424 /*---------------------------- Hashing Policies -----------------------------*/
3425
3426 /* L2 hash helper */
3427 static inline u32 bond_eth_hash(struct sk_buff *skb)
3428 {
3429         struct ethhdr *ep, hdr_tmp;
3430
3431         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3432         if (ep)
3433                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3434         return 0;
3435 }
3436
3437 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk,
3438                          int *noff, int *proto, bool l34)
3439 {
3440         const struct ipv6hdr *iph6;
3441         const struct iphdr *iph;
3442
3443         if (skb->protocol == htons(ETH_P_IP)) {
3444                 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph))))
3445                         return false;
3446                 iph = (const struct iphdr *)(skb->data + *noff);
3447                 iph_to_flow_copy_v4addrs(fk, iph);
3448                 *noff += iph->ihl << 2;
3449                 if (!ip_is_fragment(iph))
3450                         *proto = iph->protocol;
3451         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3452                 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph6))))
3453                         return false;
3454                 iph6 = (const struct ipv6hdr *)(skb->data + *noff);
3455                 iph_to_flow_copy_v6addrs(fk, iph6);
3456                 *noff += sizeof(*iph6);
3457                 *proto = iph6->nexthdr;
3458         } else {
3459                 return false;
3460         }
3461
3462         if (l34 && *proto >= 0)
3463                 fk->ports.ports = skb_flow_get_ports(skb, *noff, *proto);
3464
3465         return true;
3466 }
3467
3468 /* Extract the appropriate headers based on bond's xmit policy */
3469 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3470                               struct flow_keys *fk)
3471 {
3472         bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
3473         int noff, proto = -1;
3474
3475         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) {
3476                 memset(fk, 0, sizeof(*fk));
3477                 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
3478                                           fk, NULL, 0, 0, 0, 0);
3479         }
3480
3481         fk->ports.ports = 0;
3482         memset(&fk->icmp, 0, sizeof(fk->icmp));
3483         noff = skb_network_offset(skb);
3484         if (!bond_flow_ip(skb, fk, &noff, &proto, l34))
3485                 return false;
3486
3487         /* ICMP error packets contains at least 8 bytes of the header
3488          * of the packet which generated the error. Use this information
3489          * to correlate ICMP error packets within the same flow which
3490          * generated the error.
3491          */
3492         if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) {
3493                 skb_flow_get_icmp_tci(skb, &fk->icmp, skb->data,
3494                                       skb_transport_offset(skb),
3495                                       skb_headlen(skb));
3496                 if (proto == IPPROTO_ICMP) {
3497                         if (!icmp_is_err(fk->icmp.type))
3498                                 return true;
3499
3500                         noff += sizeof(struct icmphdr);
3501                 } else if (proto == IPPROTO_ICMPV6) {
3502                         if (!icmpv6_is_err(fk->icmp.type))
3503                                 return true;
3504
3505                         noff += sizeof(struct icmp6hdr);
3506                 }
3507                 return bond_flow_ip(skb, fk, &noff, &proto, l34);
3508         }
3509
3510         return true;
3511 }
3512
3513 /**
3514  * bond_xmit_hash - generate a hash value based on the xmit policy
3515  * @bond: bonding device
3516  * @skb: buffer to use for headers
3517  *
3518  * This function will extract the necessary headers from the skb buffer and use
3519  * them to generate a hash based on the xmit_policy set in the bonding device
3520  */
3521 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3522 {
3523         struct flow_keys flow;
3524         u32 hash;
3525
3526         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3527             skb->l4_hash)
3528                 return skb->hash;
3529
3530         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3531             !bond_flow_dissect(bond, skb, &flow))
3532                 return bond_eth_hash(skb);
3533
3534         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3535             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
3536                 hash = bond_eth_hash(skb);
3537         } else {
3538                 if (flow.icmp.id)
3539                         memcpy(&hash, &flow.icmp, sizeof(hash));
3540                 else
3541                         memcpy(&hash, &flow.ports.ports, sizeof(hash));
3542         }
3543         hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3544                 (__force u32)flow_get_u32_src(&flow);
3545         hash ^= (hash >> 16);
3546         hash ^= (hash >> 8);
3547
3548         return hash >> 1;
3549 }
3550
3551 /*-------------------------- Device entry points ----------------------------*/
3552
3553 void bond_work_init_all(struct bonding *bond)
3554 {
3555         INIT_DELAYED_WORK(&bond->mcast_work,
3556                           bond_resend_igmp_join_requests_delayed);
3557         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3558         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3559         INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3560         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3561         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3562 }
3563
3564 static void bond_work_cancel_all(struct bonding *bond)
3565 {
3566         cancel_delayed_work_sync(&bond->mii_work);
3567         cancel_delayed_work_sync(&bond->arp_work);
3568         cancel_delayed_work_sync(&bond->alb_work);
3569         cancel_delayed_work_sync(&bond->ad_work);
3570         cancel_delayed_work_sync(&bond->mcast_work);
3571         cancel_delayed_work_sync(&bond->slave_arr_work);
3572 }
3573
3574 static int bond_open(struct net_device *bond_dev)
3575 {
3576         struct bonding *bond = netdev_priv(bond_dev);
3577         struct list_head *iter;
3578         struct slave *slave;
3579
3580         /* reset slave->backup and slave->inactive */
3581         if (bond_has_slaves(bond)) {
3582                 bond_for_each_slave(bond, slave, iter) {
3583                         if (bond_uses_primary(bond) &&
3584                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3585                                 bond_set_slave_inactive_flags(slave,
3586                                                               BOND_SLAVE_NOTIFY_NOW);
3587                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3588                                 bond_set_slave_active_flags(slave,
3589                                                             BOND_SLAVE_NOTIFY_NOW);
3590                         }
3591                 }
3592         }
3593
3594         if (bond_is_lb(bond)) {
3595                 /* bond_alb_initialize must be called before the timer
3596                  * is started.
3597                  */
3598                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3599                         return -ENOMEM;
3600                 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3601                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3602         }
3603
3604         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3605                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3606
3607         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3608                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3609                 bond->recv_probe = bond_arp_rcv;
3610         }
3611
3612         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3613                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3614                 /* register to receive LACPDUs */
3615                 bond->recv_probe = bond_3ad_lacpdu_recv;
3616                 bond_3ad_initiate_agg_selection(bond, 1);
3617         }
3618
3619         if (bond_mode_can_use_xmit_hash(bond))
3620                 bond_update_slave_arr(bond, NULL);
3621
3622         return 0;
3623 }
3624
3625 static int bond_close(struct net_device *bond_dev)
3626 {
3627         struct bonding *bond = netdev_priv(bond_dev);
3628
3629         bond_work_cancel_all(bond);
3630         bond->send_peer_notif = 0;
3631         if (bond_is_lb(bond))
3632                 bond_alb_deinitialize(bond);
3633         bond->recv_probe = NULL;
3634
3635         return 0;
3636 }
3637
3638 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3639  * that some drivers can provide 32bit values only.
3640  */
3641 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3642                             const struct rtnl_link_stats64 *_new,
3643                             const struct rtnl_link_stats64 *_old)
3644 {
3645         const u64 *new = (const u64 *)_new;
3646         const u64 *old = (const u64 *)_old;
3647         u64 *res = (u64 *)_res;
3648         int i;
3649
3650         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3651                 u64 nv = new[i];
3652                 u64 ov = old[i];
3653                 s64 delta = nv - ov;
3654
3655                 /* detects if this particular field is 32bit only */
3656                 if (((nv | ov) >> 32) == 0)
3657                         delta = (s64)(s32)((u32)nv - (u32)ov);
3658
3659                 /* filter anomalies, some drivers reset their stats
3660                  * at down/up events.
3661                  */
3662                 if (delta > 0)
3663                         res[i] += delta;
3664         }
3665 }
3666
3667 #ifdef CONFIG_LOCKDEP
3668 static int bond_get_lowest_level_rcu(struct net_device *dev)
3669 {
3670         struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
3671         struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
3672         int cur = 0, max = 0;
3673
3674         now = dev;
3675         iter = &dev->adj_list.lower;
3676
3677         while (1) {
3678                 next = NULL;
3679                 while (1) {
3680                         ldev = netdev_next_lower_dev_rcu(now, &iter);
3681                         if (!ldev)
3682                                 break;
3683
3684                         next = ldev;
3685                         niter = &ldev->adj_list.lower;
3686                         dev_stack[cur] = now;
3687                         iter_stack[cur++] = iter;
3688                         if (max <= cur)
3689                                 max = cur;
3690                         break;
3691                 }
3692
3693                 if (!next) {
3694                         if (!cur)
3695                                 return max;
3696                         next = dev_stack[--cur];
3697                         niter = iter_stack[cur];
3698                 }
3699
3700                 now = next;
3701                 iter = niter;
3702         }
3703
3704         return max;
3705 }
3706 #endif
3707
3708 static void bond_get_stats(struct net_device *bond_dev,
3709                            struct rtnl_link_stats64 *stats)
3710 {
3711         struct bonding *bond = netdev_priv(bond_dev);
3712         struct rtnl_link_stats64 temp;
3713         struct list_head *iter;
3714         struct slave *slave;
3715         int nest_level = 0;
3716
3717
3718         rcu_read_lock();
3719 #ifdef CONFIG_LOCKDEP
3720         nest_level = bond_get_lowest_level_rcu(bond_dev);
3721 #endif
3722
3723         spin_lock_nested(&bond->stats_lock, nest_level);
3724         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3725
3726         bond_for_each_slave_rcu(bond, slave, iter) {
3727                 const struct rtnl_link_stats64 *new =
3728                         dev_get_stats(slave->dev, &temp);
3729
3730                 bond_fold_stats(stats, new, &slave->slave_stats);
3731
3732                 /* save off the slave stats for the next run */
3733                 memcpy(&slave->slave_stats, new, sizeof(*new));
3734         }
3735
3736         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3737         spin_unlock(&bond->stats_lock);
3738         rcu_read_unlock();
3739 }
3740
3741 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3742 {
3743         struct bonding *bond = netdev_priv(bond_dev);
3744         struct net_device *slave_dev = NULL;
3745         struct ifbond k_binfo;
3746         struct ifbond __user *u_binfo = NULL;
3747         struct ifslave k_sinfo;
3748         struct ifslave __user *u_sinfo = NULL;
3749         struct mii_ioctl_data *mii = NULL;
3750         struct bond_opt_value newval;
3751         struct net *net;
3752         int res = 0;
3753
3754         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3755
3756         switch (cmd) {
3757         case SIOCGMIIPHY:
3758                 mii = if_mii(ifr);
3759                 if (!mii)
3760                         return -EINVAL;
3761
3762                 mii->phy_id = 0;
3763                 fallthrough;
3764         case SIOCGMIIREG:
3765                 /* We do this again just in case we were called by SIOCGMIIREG
3766                  * instead of SIOCGMIIPHY.
3767                  */
3768                 mii = if_mii(ifr);
3769                 if (!mii)
3770                         return -EINVAL;
3771
3772                 if (mii->reg_num == 1) {
3773                         mii->val_out = 0;
3774                         if (netif_carrier_ok(bond->dev))
3775                                 mii->val_out = BMSR_LSTATUS;
3776                 }
3777
3778                 return 0;
3779         case BOND_INFO_QUERY_OLD:
3780         case SIOCBONDINFOQUERY:
3781                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3782
3783                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3784                         return -EFAULT;
3785
3786                 bond_info_query(bond_dev, &k_binfo);
3787                 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3788                         return -EFAULT;
3789
3790                 return 0;
3791         case BOND_SLAVE_INFO_QUERY_OLD:
3792         case SIOCBONDSLAVEINFOQUERY:
3793                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3794
3795                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3796                         return -EFAULT;
3797
3798                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3799                 if (res == 0 &&
3800                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3801                         return -EFAULT;
3802
3803                 return res;
3804         default:
3805                 break;
3806         }
3807
3808         net = dev_net(bond_dev);
3809
3810         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3811                 return -EPERM;
3812
3813         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3814
3815         slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3816
3817         if (!slave_dev)
3818                 return -ENODEV;
3819
3820         switch (cmd) {
3821         case BOND_ENSLAVE_OLD:
3822         case SIOCBONDENSLAVE:
3823                 res = bond_enslave(bond_dev, slave_dev, NULL);
3824                 break;
3825         case BOND_RELEASE_OLD:
3826         case SIOCBONDRELEASE:
3827                 res = bond_release(bond_dev, slave_dev);
3828                 break;
3829         case BOND_SETHWADDR_OLD:
3830         case SIOCBONDSETHWADDR:
3831                 res = bond_set_dev_addr(bond_dev, slave_dev);
3832                 break;
3833         case BOND_CHANGE_ACTIVE_OLD:
3834         case SIOCBONDCHANGEACTIVE:
3835                 bond_opt_initstr(&newval, slave_dev->name);
3836                 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3837                                             &newval);
3838                 break;
3839         default:
3840                 res = -EOPNOTSUPP;
3841         }
3842
3843         return res;
3844 }
3845
3846 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3847 {
3848         struct bonding *bond = netdev_priv(bond_dev);
3849
3850         if (change & IFF_PROMISC)
3851                 bond_set_promiscuity(bond,
3852                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3853
3854         if (change & IFF_ALLMULTI)
3855                 bond_set_allmulti(bond,
3856                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3857 }
3858
3859 static void bond_set_rx_mode(struct net_device *bond_dev)
3860 {
3861         struct bonding *bond = netdev_priv(bond_dev);
3862         struct list_head *iter;
3863         struct slave *slave;
3864
3865         rcu_read_lock();
3866         if (bond_uses_primary(bond)) {
3867                 slave = rcu_dereference(bond->curr_active_slave);
3868                 if (slave) {
3869                         dev_uc_sync(slave->dev, bond_dev);
3870                         dev_mc_sync(slave->dev, bond_dev);
3871                 }
3872         } else {
3873                 bond_for_each_slave_rcu(bond, slave, iter) {
3874                         dev_uc_sync_multiple(slave->dev, bond_dev);
3875                         dev_mc_sync_multiple(slave->dev, bond_dev);
3876                 }
3877         }
3878         rcu_read_unlock();
3879 }
3880
3881 static int bond_neigh_init(struct neighbour *n)
3882 {
3883         struct bonding *bond = netdev_priv(n->dev);
3884         const struct net_device_ops *slave_ops;
3885         struct neigh_parms parms;
3886         struct slave *slave;
3887         int ret = 0;
3888
3889         rcu_read_lock();
3890         slave = bond_first_slave_rcu(bond);
3891         if (!slave)
3892                 goto out;
3893         slave_ops = slave->dev->netdev_ops;
3894         if (!slave_ops->ndo_neigh_setup)
3895                 goto out;
3896
3897         /* TODO: find another way [1] to implement this.
3898          * Passing a zeroed structure is fragile,
3899          * but at least we do not pass garbage.
3900          *
3901          * [1] One way would be that ndo_neigh_setup() never touch
3902          *     struct neigh_parms, but propagate the new neigh_setup()
3903          *     back to ___neigh_create() / neigh_parms_alloc()
3904          */
3905         memset(&parms, 0, sizeof(parms));
3906         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3907
3908         if (ret)
3909                 goto out;
3910
3911         if (parms.neigh_setup)
3912                 ret = parms.neigh_setup(n);
3913 out:
3914         rcu_read_unlock();
3915         return ret;
3916 }
3917
3918 /* The bonding ndo_neigh_setup is called at init time beofre any
3919  * slave exists. So we must declare proxy setup function which will
3920  * be used at run time to resolve the actual slave neigh param setup.
3921  *
3922  * It's also called by master devices (such as vlans) to setup their
3923  * underlying devices. In that case - do nothing, we're already set up from
3924  * our init.
3925  */
3926 static int bond_neigh_setup(struct net_device *dev,
3927                             struct neigh_parms *parms)
3928 {
3929         /* modify only our neigh_parms */
3930         if (parms->dev == dev)
3931                 parms->neigh_setup = bond_neigh_init;
3932
3933         return 0;
3934 }
3935
3936 /* Change the MTU of all of a master's slaves to match the master */
3937 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3938 {
3939         struct bonding *bond = netdev_priv(bond_dev);
3940         struct slave *slave, *rollback_slave;
3941         struct list_head *iter;
3942         int res = 0;
3943
3944         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3945
3946         bond_for_each_slave(bond, slave, iter) {
3947                 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
3948                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3949
3950                 res = dev_set_mtu(slave->dev, new_mtu);
3951
3952                 if (res) {
3953                         /* If we failed to set the slave's mtu to the new value
3954                          * we must abort the operation even in ACTIVE_BACKUP
3955                          * mode, because if we allow the backup slaves to have
3956                          * different mtu values than the active slave we'll
3957                          * need to change their mtu when doing a failover. That
3958                          * means changing their mtu from timer context, which
3959                          * is probably not a good idea.
3960                          */
3961                         slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
3962                                   res, new_mtu);
3963                         goto unwind;
3964                 }
3965         }
3966
3967         bond_dev->mtu = new_mtu;
3968
3969         return 0;
3970
3971 unwind:
3972         /* unwind from head to the slave that failed */
3973         bond_for_each_slave(bond, rollback_slave, iter) {
3974                 int tmp_res;
3975
3976                 if (rollback_slave == slave)
3977                         break;
3978
3979                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3980                 if (tmp_res)
3981                         slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
3982                                   tmp_res);
3983         }
3984
3985         return res;
3986 }
3987
3988 /* Change HW address
3989  *
3990  * Note that many devices must be down to change the HW address, and
3991  * downing the master releases all slaves.  We can make bonds full of
3992  * bonding devices to test this, however.
3993  */
3994 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3995 {
3996         struct bonding *bond = netdev_priv(bond_dev);
3997         struct slave *slave, *rollback_slave;
3998         struct sockaddr_storage *ss = addr, tmp_ss;
3999         struct list_head *iter;
4000         int res = 0;
4001
4002         if (BOND_MODE(bond) == BOND_MODE_ALB)
4003                 return bond_alb_set_mac_address(bond_dev, addr);
4004
4005
4006         netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4007
4008         /* If fail_over_mac is enabled, do nothing and return success.
4009          * Returning an error causes ifenslave to fail.
4010          */
4011         if (bond->params.fail_over_mac &&
4012             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4013                 return 0;
4014
4015         if (!is_valid_ether_addr(ss->__data))
4016                 return -EADDRNOTAVAIL;
4017
4018         bond_for_each_slave(bond, slave, iter) {
4019                 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4020                           __func__, slave);
4021                 res = dev_set_mac_address(slave->dev, addr, NULL);
4022                 if (res) {
4023                         /* TODO: consider downing the slave
4024                          * and retry ?
4025                          * User should expect communications
4026                          * breakage anyway until ARP finish
4027                          * updating, so...
4028                          */
4029                         slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4030                                   __func__, res);
4031                         goto unwind;
4032                 }
4033         }
4034
4035         /* success */
4036         memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
4037         return 0;
4038
4039 unwind:
4040         memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4041         tmp_ss.ss_family = bond_dev->type;
4042
4043         /* unwind from head to the slave that failed */
4044         bond_for_each_slave(bond, rollback_slave, iter) {
4045                 int tmp_res;
4046
4047                 if (rollback_slave == slave)
4048                         break;
4049
4050                 tmp_res = dev_set_mac_address(rollback_slave->dev,
4051                                               (struct sockaddr *)&tmp_ss, NULL);
4052                 if (tmp_res) {
4053                         slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4054                                    __func__, tmp_res);
4055                 }
4056         }
4057
4058         return res;
4059 }
4060
4061 /**
4062  * bond_get_slave_by_id - get xmit slave with slave_id
4063  * @bond: bonding device that is transmitting
4064  * @slave_id: slave id up to slave_cnt-1 through which to transmit
4065  *
4066  * This function tries to get slave with slave_id but in case
4067  * it fails, it tries to find the first available slave for transmission.
4068  */
4069 static struct slave *bond_get_slave_by_id(struct bonding *bond,
4070                                           int slave_id)
4071 {
4072         struct list_head *iter;
4073         struct slave *slave;
4074         int i = slave_id;
4075
4076         /* Here we start from the slave with slave_id */
4077         bond_for_each_slave_rcu(bond, slave, iter) {
4078                 if (--i < 0) {
4079                         if (bond_slave_can_tx(slave))
4080                                 return slave;
4081                 }
4082         }
4083
4084         /* Here we start from the first slave up to slave_id */
4085         i = slave_id;
4086         bond_for_each_slave_rcu(bond, slave, iter) {
4087                 if (--i < 0)
4088                         break;
4089                 if (bond_slave_can_tx(slave))
4090                         return slave;
4091         }
4092         /* no slave that can tx has been found */
4093         return NULL;
4094 }
4095
4096 /**
4097  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4098  * @bond: bonding device to use
4099  *
4100  * Based on the value of the bonding device's packets_per_slave parameter
4101  * this function generates a slave id, which is usually used as the next
4102  * slave to transmit through.
4103  */
4104 static u32 bond_rr_gen_slave_id(struct bonding *bond)
4105 {
4106         u32 slave_id;
4107         struct reciprocal_value reciprocal_packets_per_slave;
4108         int packets_per_slave = bond->params.packets_per_slave;
4109
4110         switch (packets_per_slave) {
4111         case 0:
4112                 slave_id = prandom_u32();
4113                 break;
4114         case 1:
4115                 slave_id = bond->rr_tx_counter;
4116                 break;
4117         default:
4118                 reciprocal_packets_per_slave =
4119                         bond->params.reciprocal_packets_per_slave;
4120                 slave_id = reciprocal_divide(bond->rr_tx_counter,
4121                                              reciprocal_packets_per_slave);
4122                 break;
4123         }
4124         bond->rr_tx_counter++;
4125
4126         return slave_id;
4127 }
4128
4129 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4130                                                     struct sk_buff *skb)
4131 {
4132         struct slave *slave;
4133         int slave_cnt;
4134         u32 slave_id;
4135
4136         /* Start with the curr_active_slave that joined the bond as the
4137          * default for sending IGMP traffic.  For failover purposes one
4138          * needs to maintain some consistency for the interface that will
4139          * send the join/membership reports.  The curr_active_slave found
4140          * will send all of this type of traffic.
4141          */
4142         if (skb->protocol == htons(ETH_P_IP)) {
4143                 int noff = skb_network_offset(skb);
4144                 struct iphdr *iph;
4145
4146                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4147                         goto non_igmp;
4148
4149                 iph = ip_hdr(skb);
4150                 if (iph->protocol == IPPROTO_IGMP) {
4151                         slave = rcu_dereference(bond->curr_active_slave);
4152                         if (slave)
4153                                 return slave;
4154                         return bond_get_slave_by_id(bond, 0);
4155                 }
4156         }
4157
4158 non_igmp:
4159         slave_cnt = READ_ONCE(bond->slave_cnt);
4160         if (likely(slave_cnt)) {
4161                 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4162                 return bond_get_slave_by_id(bond, slave_id);
4163         }
4164         return NULL;
4165 }
4166
4167 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4168                                         struct net_device *bond_dev)
4169 {
4170         struct bonding *bond = netdev_priv(bond_dev);
4171         struct slave *slave;
4172
4173         slave = bond_xmit_roundrobin_slave_get(bond, skb);
4174         if (likely(slave))
4175                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4176
4177         return bond_tx_drop(bond_dev, skb);
4178 }
4179
4180 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond,
4181                                                       struct sk_buff *skb)
4182 {
4183         return rcu_dereference(bond->curr_active_slave);
4184 }
4185
4186 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
4187  * the bond has a usable interface.
4188  */
4189 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4190                                           struct net_device *bond_dev)
4191 {
4192         struct bonding *bond = netdev_priv(bond_dev);
4193         struct slave *slave;
4194
4195         slave = bond_xmit_activebackup_slave_get(bond, skb);
4196         if (slave)
4197                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4198
4199         return bond_tx_drop(bond_dev, skb);
4200 }
4201
4202 /* Use this to update slave_array when (a) it's not appropriate to update
4203  * slave_array right away (note that update_slave_array() may sleep)
4204  * and / or (b) RTNL is not held.
4205  */
4206 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4207 {
4208         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4209 }
4210
4211 /* Slave array work handler. Holds only RTNL */
4212 static void bond_slave_arr_handler(struct work_struct *work)
4213 {
4214         struct bonding *bond = container_of(work, struct bonding,
4215                                             slave_arr_work.work);
4216         int ret;
4217
4218         if (!rtnl_trylock())
4219                 goto err;
4220
4221         ret = bond_update_slave_arr(bond, NULL);
4222         rtnl_unlock();
4223         if (ret) {
4224                 pr_warn_ratelimited("Failed to update slave array from WT\n");
4225                 goto err;
4226         }
4227         return;
4228
4229 err:
4230         bond_slave_arr_work_rearm(bond, 1);
4231 }
4232
4233 static void bond_skip_slave(struct bond_up_slave *slaves,
4234                             struct slave *skipslave)
4235 {
4236         int idx;
4237
4238         /* Rare situation where caller has asked to skip a specific
4239          * slave but allocation failed (most likely!). BTW this is
4240          * only possible when the call is initiated from
4241          * __bond_release_one(). In this situation; overwrite the
4242          * skipslave entry in the array with the last entry from the
4243          * array to avoid a situation where the xmit path may choose
4244          * this to-be-skipped slave to send a packet out.
4245          */
4246         for (idx = 0; slaves && idx < slaves->count; idx++) {
4247                 if (skipslave == slaves->arr[idx]) {
4248                         slaves->arr[idx] =
4249                                 slaves->arr[slaves->count - 1];
4250                         slaves->count--;
4251                         break;
4252                 }
4253         }
4254 }
4255
4256 static void bond_set_slave_arr(struct bonding *bond,
4257                                struct bond_up_slave *usable_slaves,
4258                                struct bond_up_slave *all_slaves)
4259 {
4260         struct bond_up_slave *usable, *all;
4261
4262         usable = rtnl_dereference(bond->usable_slaves);
4263         rcu_assign_pointer(bond->usable_slaves, usable_slaves);
4264         kfree_rcu(usable, rcu);
4265
4266         all = rtnl_dereference(bond->all_slaves);
4267         rcu_assign_pointer(bond->all_slaves, all_slaves);
4268         kfree_rcu(all, rcu);
4269 }
4270
4271 static void bond_reset_slave_arr(struct bonding *bond)
4272 {
4273         struct bond_up_slave *usable, *all;
4274
4275         usable = rtnl_dereference(bond->usable_slaves);
4276         if (usable) {
4277                 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4278                 kfree_rcu(usable, rcu);
4279         }
4280
4281         all = rtnl_dereference(bond->all_slaves);
4282         if (all) {
4283                 RCU_INIT_POINTER(bond->all_slaves, NULL);
4284                 kfree_rcu(all, rcu);
4285         }
4286 }
4287
4288 /* Build the usable slaves array in control path for modes that use xmit-hash
4289  * to determine the slave interface -
4290  * (a) BOND_MODE_8023AD
4291  * (b) BOND_MODE_XOR
4292  * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
4293  *
4294  * The caller is expected to hold RTNL only and NO other lock!
4295  */
4296 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
4297 {
4298         struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
4299         struct slave *slave;
4300         struct list_head *iter;
4301         int agg_id = 0;
4302         int ret = 0;
4303
4304 #ifdef CONFIG_LOCKDEP
4305         WARN_ON(lockdep_is_held(&bond->mode_lock));
4306 #endif
4307
4308         usable_slaves = kzalloc(struct_size(usable_slaves, arr,
4309                                             bond->slave_cnt), GFP_KERNEL);
4310         all_slaves = kzalloc(struct_size(all_slaves, arr,
4311                                          bond->slave_cnt), GFP_KERNEL);
4312         if (!usable_slaves || !all_slaves) {
4313                 ret = -ENOMEM;
4314                 goto out;
4315         }
4316         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4317                 struct ad_info ad_info;
4318
4319                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
4320                         pr_debug("bond_3ad_get_active_agg_info failed\n");
4321                         /* No active aggragator means it's not safe to use
4322                          * the previous array.
4323                          */
4324                         bond_reset_slave_arr(bond);
4325                         goto out;
4326                 }
4327                 agg_id = ad_info.aggregator_id;
4328         }
4329         bond_for_each_slave(bond, slave, iter) {
4330                 if (skipslave == slave)
4331                         continue;
4332
4333                 all_slaves->arr[all_slaves->count++] = slave;
4334                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4335                         struct aggregator *agg;
4336
4337                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
4338                         if (!agg || agg->aggregator_identifier != agg_id)
4339                                 continue;
4340                 }
4341                 if (!bond_slave_can_tx(slave))
4342                         continue;
4343
4344                 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4345                           usable_slaves->count);
4346
4347                 usable_slaves->arr[usable_slaves->count++] = slave;
4348         }
4349
4350         bond_set_slave_arr(bond, usable_slaves, all_slaves);
4351         return ret;
4352 out:
4353         if (ret != 0 && skipslave) {
4354                 bond_skip_slave(rtnl_dereference(bond->all_slaves),
4355                                 skipslave);
4356                 bond_skip_slave(rtnl_dereference(bond->usable_slaves),
4357                                 skipslave);
4358         }
4359         kfree_rcu(all_slaves, rcu);
4360         kfree_rcu(usable_slaves, rcu);
4361
4362         return ret;
4363 }
4364
4365 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
4366                                                  struct sk_buff *skb,
4367                                                  struct bond_up_slave *slaves)
4368 {
4369         struct slave *slave;
4370         unsigned int count;
4371         u32 hash;
4372
4373         hash = bond_xmit_hash(bond, skb);
4374         count = slaves ? READ_ONCE(slaves->count) : 0;
4375         if (unlikely(!count))
4376                 return NULL;
4377
4378         slave = slaves->arr[hash % count];
4379         return slave;
4380 }
4381
4382 /* Use this Xmit function for 3AD as well as XOR modes. The current
4383  * usable slave array is formed in the control path. The xmit function
4384  * just calculates hash and sends the packet out.
4385  */
4386 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4387                                      struct net_device *dev)
4388 {
4389         struct bonding *bond = netdev_priv(dev);
4390         struct bond_up_slave *slaves;
4391         struct slave *slave;
4392
4393         slaves = rcu_dereference(bond->usable_slaves);
4394         slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4395         if (likely(slave))
4396                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4397
4398         return bond_tx_drop(dev, skb);
4399 }
4400
4401 /* in broadcast mode, we send everything to all usable interfaces. */
4402 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4403                                        struct net_device *bond_dev)
4404 {
4405         struct bonding *bond = netdev_priv(bond_dev);
4406         struct slave *slave = NULL;
4407         struct list_head *iter;
4408
4409         bond_for_each_slave_rcu(bond, slave, iter) {
4410                 if (bond_is_last_slave(bond, slave))
4411                         break;
4412                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4413                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4414
4415                         if (!skb2) {
4416                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4417                                                     bond_dev->name, __func__);
4418                                 continue;
4419                         }
4420                         bond_dev_queue_xmit(bond, skb2, slave->dev);
4421                 }
4422         }
4423         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4424                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4425
4426         return bond_tx_drop(bond_dev, skb);
4427 }
4428
4429 /*------------------------- Device initialization ---------------------------*/
4430
4431 /* Lookup the slave that corresponds to a qid */
4432 static inline int bond_slave_override(struct bonding *bond,
4433                                       struct sk_buff *skb)
4434 {
4435         struct slave *slave = NULL;
4436         struct list_head *iter;
4437
4438         if (!skb_rx_queue_recorded(skb))
4439                 return 1;
4440
4441         /* Find out if any slaves have the same mapping as this skb. */
4442         bond_for_each_slave_rcu(bond, slave, iter) {
4443                 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4444                         if (bond_slave_is_up(slave) &&
4445                             slave->link == BOND_LINK_UP) {
4446                                 bond_dev_queue_xmit(bond, skb, slave->dev);
4447                                 return 0;
4448                         }
4449                         /* If the slave isn't UP, use default transmit policy. */
4450                         break;
4451                 }
4452         }
4453
4454         return 1;
4455 }
4456
4457
4458 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4459                              struct net_device *sb_dev)
4460 {
4461         /* This helper function exists to help dev_pick_tx get the correct
4462          * destination queue.  Using a helper function skips a call to
4463          * skb_tx_hash and will put the skbs in the queue we expect on their
4464          * way down to the bonding driver.
4465          */
4466         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4467
4468         /* Save the original txq to restore before passing to the driver */
4469         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4470
4471         if (unlikely(txq >= dev->real_num_tx_queues)) {
4472                 do {
4473                         txq -= dev->real_num_tx_queues;
4474                 } while (txq >= dev->real_num_tx_queues);
4475         }
4476         return txq;
4477 }
4478
4479 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
4480                                               struct sk_buff *skb,
4481                                               bool all_slaves)
4482 {
4483         struct bonding *bond = netdev_priv(master_dev);
4484         struct bond_up_slave *slaves;
4485         struct slave *slave = NULL;
4486
4487         switch (BOND_MODE(bond)) {
4488         case BOND_MODE_ROUNDROBIN:
4489                 slave = bond_xmit_roundrobin_slave_get(bond, skb);
4490                 break;
4491         case BOND_MODE_ACTIVEBACKUP:
4492                 slave = bond_xmit_activebackup_slave_get(bond, skb);
4493                 break;
4494         case BOND_MODE_8023AD:
4495         case BOND_MODE_XOR:
4496                 if (all_slaves)
4497                         slaves = rcu_dereference(bond->all_slaves);
4498                 else
4499                         slaves = rcu_dereference(bond->usable_slaves);
4500                 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4501                 break;
4502         case BOND_MODE_BROADCAST:
4503                 break;
4504         case BOND_MODE_ALB:
4505                 slave = bond_xmit_alb_slave_get(bond, skb);
4506                 break;
4507         case BOND_MODE_TLB:
4508                 slave = bond_xmit_tlb_slave_get(bond, skb);
4509                 break;
4510         default:
4511                 /* Should never happen, mode already checked */
4512                 WARN_ONCE(true, "Unknown bonding mode");
4513                 break;
4514         }
4515
4516         if (slave)
4517                 return slave->dev;
4518         return NULL;
4519 }
4520
4521 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4522 {
4523         struct bonding *bond = netdev_priv(dev);
4524
4525         if (bond_should_override_tx_queue(bond) &&
4526             !bond_slave_override(bond, skb))
4527                 return NETDEV_TX_OK;
4528
4529         switch (BOND_MODE(bond)) {
4530         case BOND_MODE_ROUNDROBIN:
4531                 return bond_xmit_roundrobin(skb, dev);
4532         case BOND_MODE_ACTIVEBACKUP:
4533                 return bond_xmit_activebackup(skb, dev);
4534         case BOND_MODE_8023AD:
4535         case BOND_MODE_XOR:
4536                 return bond_3ad_xor_xmit(skb, dev);
4537         case BOND_MODE_BROADCAST:
4538                 return bond_xmit_broadcast(skb, dev);
4539         case BOND_MODE_ALB:
4540                 return bond_alb_xmit(skb, dev);
4541         case BOND_MODE_TLB:
4542                 return bond_tlb_xmit(skb, dev);
4543         default:
4544                 /* Should never happen, mode already checked */
4545                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4546                 WARN_ON_ONCE(1);
4547                 return bond_tx_drop(dev, skb);
4548         }
4549 }
4550
4551 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4552 {
4553         struct bonding *bond = netdev_priv(dev);
4554         netdev_tx_t ret = NETDEV_TX_OK;
4555
4556         /* If we risk deadlock from transmitting this in the
4557          * netpoll path, tell netpoll to queue the frame for later tx
4558          */
4559         if (unlikely(is_netpoll_tx_blocked(dev)))
4560                 return NETDEV_TX_BUSY;
4561
4562         rcu_read_lock();
4563         if (bond_has_slaves(bond))
4564                 ret = __bond_start_xmit(skb, dev);
4565         else
4566                 ret = bond_tx_drop(dev, skb);
4567         rcu_read_unlock();
4568
4569         return ret;
4570 }
4571
4572 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
4573 {
4574         if (speed == 0 || speed == SPEED_UNKNOWN)
4575                 speed = slave->speed;
4576         else
4577                 speed = min(speed, slave->speed);
4578
4579         return speed;
4580 }
4581
4582 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4583                                            struct ethtool_link_ksettings *cmd)
4584 {
4585         struct bonding *bond = netdev_priv(bond_dev);
4586         struct list_head *iter;
4587         struct slave *slave;
4588         u32 speed = 0;
4589
4590         cmd->base.duplex = DUPLEX_UNKNOWN;
4591         cmd->base.port = PORT_OTHER;
4592
4593         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4594          * do not need to check mode.  Though link speed might not represent
4595          * the true receive or transmit bandwidth (not all modes are symmetric)
4596          * this is an accurate maximum.
4597          */
4598         bond_for_each_slave(bond, slave, iter) {
4599                 if (bond_slave_can_tx(slave)) {
4600                         if (slave->speed != SPEED_UNKNOWN) {
4601                                 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
4602                                         speed = bond_mode_bcast_speed(slave,
4603                                                                       speed);
4604                                 else
4605                                         speed += slave->speed;
4606                         }
4607                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4608                             slave->duplex != DUPLEX_UNKNOWN)
4609                                 cmd->base.duplex = slave->duplex;
4610                 }
4611         }
4612         cmd->base.speed = speed ? : SPEED_UNKNOWN;
4613
4614         return 0;
4615 }
4616
4617 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4618                                      struct ethtool_drvinfo *drvinfo)
4619 {
4620         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4621         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4622                  BOND_ABI_VERSION);
4623 }
4624
4625 static const struct ethtool_ops bond_ethtool_ops = {
4626         .get_drvinfo            = bond_ethtool_get_drvinfo,
4627         .get_link               = ethtool_op_get_link,
4628         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4629 };
4630
4631 static const struct net_device_ops bond_netdev_ops = {
4632         .ndo_init               = bond_init,
4633         .ndo_uninit             = bond_uninit,
4634         .ndo_open               = bond_open,
4635         .ndo_stop               = bond_close,
4636         .ndo_start_xmit         = bond_start_xmit,
4637         .ndo_select_queue       = bond_select_queue,
4638         .ndo_get_stats64        = bond_get_stats,
4639         .ndo_do_ioctl           = bond_do_ioctl,
4640         .ndo_change_rx_flags    = bond_change_rx_flags,
4641         .ndo_set_rx_mode        = bond_set_rx_mode,
4642         .ndo_change_mtu         = bond_change_mtu,
4643         .ndo_set_mac_address    = bond_set_mac_address,
4644         .ndo_neigh_setup        = bond_neigh_setup,
4645         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4646         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4647 #ifdef CONFIG_NET_POLL_CONTROLLER
4648         .ndo_netpoll_setup      = bond_netpoll_setup,
4649         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4650         .ndo_poll_controller    = bond_poll_controller,
4651 #endif
4652         .ndo_add_slave          = bond_enslave,
4653         .ndo_del_slave          = bond_release,
4654         .ndo_fix_features       = bond_fix_features,
4655         .ndo_features_check     = passthru_features_check,
4656         .ndo_get_xmit_slave     = bond_xmit_get_slave,
4657 };
4658
4659 static const struct device_type bond_type = {
4660         .name = "bond",
4661 };
4662
4663 static void bond_destructor(struct net_device *bond_dev)
4664 {
4665         struct bonding *bond = netdev_priv(bond_dev);
4666         if (bond->wq)
4667                 destroy_workqueue(bond->wq);
4668 }
4669
4670 void bond_setup(struct net_device *bond_dev)
4671 {
4672         struct bonding *bond = netdev_priv(bond_dev);
4673
4674         spin_lock_init(&bond->mode_lock);
4675         bond->params = bonding_defaults;
4676
4677         /* Initialize pointers */
4678         bond->dev = bond_dev;
4679
4680         /* Initialize the device entry points */
4681         ether_setup(bond_dev);
4682         bond_dev->max_mtu = ETH_MAX_MTU;
4683         bond_dev->netdev_ops = &bond_netdev_ops;
4684         bond_dev->ethtool_ops = &bond_ethtool_ops;
4685
4686         bond_dev->needs_free_netdev = true;
4687         bond_dev->priv_destructor = bond_destructor;
4688
4689         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4690
4691         /* Initialize the device options */
4692         bond_dev->flags |= IFF_MASTER;
4693         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4694         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4695
4696 #ifdef CONFIG_XFRM_OFFLOAD
4697         /* set up xfrm device ops (only supported in active-backup right now) */
4698         bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
4699         bond->xs = NULL;
4700 #endif /* CONFIG_XFRM_OFFLOAD */
4701
4702         /* don't acquire bond device's netif_tx_lock when transmitting */
4703         bond_dev->features |= NETIF_F_LLTX;
4704
4705         /* By default, we declare the bond to be fully
4706          * VLAN hardware accelerated capable. Special
4707          * care is taken in the various xmit functions
4708          * when there are slaves that are not hw accel
4709          * capable
4710          */
4711
4712         /* Don't allow bond devices to change network namespaces. */
4713         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4714
4715         bond_dev->hw_features = BOND_VLAN_FEATURES |
4716                                 NETIF_F_HW_VLAN_CTAG_RX |
4717                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4718
4719         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4;
4720 #ifdef CONFIG_XFRM_OFFLOAD
4721         bond_dev->hw_features |= BOND_XFRM_FEATURES;
4722 #endif /* CONFIG_XFRM_OFFLOAD */
4723         bond_dev->features |= bond_dev->hw_features;
4724         bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4725 #ifdef CONFIG_XFRM_OFFLOAD
4726         /* Disable XFRM features if this isn't an active-backup config */
4727         if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
4728                 bond_dev->features &= ~BOND_XFRM_FEATURES;
4729 #endif /* CONFIG_XFRM_OFFLOAD */
4730 }
4731
4732 /* Destroy a bonding device.
4733  * Must be under rtnl_lock when this function is called.
4734  */
4735 static void bond_uninit(struct net_device *bond_dev)
4736 {
4737         struct bonding *bond = netdev_priv(bond_dev);
4738         struct bond_up_slave *usable, *all;
4739         struct list_head *iter;
4740         struct slave *slave;
4741
4742         bond_netpoll_cleanup(bond_dev);
4743
4744         /* Release the bonded slaves */
4745         bond_for_each_slave(bond, slave, iter)
4746                 __bond_release_one(bond_dev, slave->dev, true, true);
4747         netdev_info(bond_dev, "Released all slaves\n");
4748
4749         usable = rtnl_dereference(bond->usable_slaves);
4750         if (usable) {
4751                 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4752                 kfree_rcu(usable, rcu);
4753         }
4754
4755         all = rtnl_dereference(bond->all_slaves);
4756         if (all) {
4757                 RCU_INIT_POINTER(bond->all_slaves, NULL);
4758                 kfree_rcu(all, rcu);
4759         }
4760
4761         list_del(&bond->bond_list);
4762
4763         bond_debug_unregister(bond);
4764 }
4765
4766 /*------------------------- Module initialization ---------------------------*/
4767
4768 static int bond_check_params(struct bond_params *params)
4769 {
4770         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4771         struct bond_opt_value newval;
4772         const struct bond_opt_value *valptr;
4773         int arp_all_targets_value = 0;
4774         u16 ad_actor_sys_prio = 0;
4775         u16 ad_user_port_key = 0;
4776         __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4777         int arp_ip_count;
4778         int bond_mode   = BOND_MODE_ROUNDROBIN;
4779         int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4780         int lacp_fast = 0;
4781         int tlb_dynamic_lb;
4782
4783         /* Convert string parameters. */
4784         if (mode) {
4785                 bond_opt_initstr(&newval, mode);
4786                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4787                 if (!valptr) {
4788                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4789                         return -EINVAL;
4790                 }
4791                 bond_mode = valptr->value;
4792         }
4793
4794         if (xmit_hash_policy) {
4795                 if (bond_mode == BOND_MODE_ROUNDROBIN ||
4796                     bond_mode == BOND_MODE_ACTIVEBACKUP ||
4797                     bond_mode == BOND_MODE_BROADCAST) {
4798                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4799                                 bond_mode_name(bond_mode));
4800                 } else {
4801                         bond_opt_initstr(&newval, xmit_hash_policy);
4802                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4803                                                 &newval);
4804                         if (!valptr) {
4805                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4806                                        xmit_hash_policy);
4807                                 return -EINVAL;
4808                         }
4809                         xmit_hashtype = valptr->value;
4810                 }
4811         }
4812
4813         if (lacp_rate) {
4814                 if (bond_mode != BOND_MODE_8023AD) {
4815                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4816                                 bond_mode_name(bond_mode));
4817                 } else {
4818                         bond_opt_initstr(&newval, lacp_rate);
4819                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4820                                                 &newval);
4821                         if (!valptr) {
4822                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4823                                        lacp_rate);
4824                                 return -EINVAL;
4825                         }
4826                         lacp_fast = valptr->value;
4827                 }
4828         }
4829
4830         if (ad_select) {
4831                 bond_opt_initstr(&newval, ad_select);
4832                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4833                                         &newval);
4834                 if (!valptr) {
4835                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4836                         return -EINVAL;
4837                 }
4838                 params->ad_select = valptr->value;
4839                 if (bond_mode != BOND_MODE_8023AD)
4840                         pr_warn("ad_select param only affects 802.3ad mode\n");
4841         } else {
4842                 params->ad_select = BOND_AD_STABLE;
4843         }
4844
4845         if (max_bonds < 0) {
4846                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4847                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4848                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4849         }
4850
4851         if (miimon < 0) {
4852                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4853                         miimon, INT_MAX);
4854                 miimon = 0;
4855         }
4856
4857         if (updelay < 0) {
4858                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4859                         updelay, INT_MAX);
4860                 updelay = 0;
4861         }
4862
4863         if (downdelay < 0) {
4864                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4865                         downdelay, INT_MAX);
4866                 downdelay = 0;
4867         }
4868
4869         if ((use_carrier != 0) && (use_carrier != 1)) {
4870                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4871                         use_carrier);
4872                 use_carrier = 1;
4873         }
4874
4875         if (num_peer_notif < 0 || num_peer_notif > 255) {
4876                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4877                         num_peer_notif);
4878                 num_peer_notif = 1;
4879         }
4880
4881         /* reset values for 802.3ad/TLB/ALB */
4882         if (!bond_mode_uses_arp(bond_mode)) {
4883                 if (!miimon) {
4884                         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");
4885                         pr_warn("Forcing miimon to 100msec\n");
4886                         miimon = BOND_DEFAULT_MIIMON;
4887                 }
4888         }
4889
4890         if (tx_queues < 1 || tx_queues > 255) {
4891                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4892                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4893                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4894         }
4895
4896         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4897                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4898                         all_slaves_active);
4899                 all_slaves_active = 0;
4900         }
4901
4902         if (resend_igmp < 0 || resend_igmp > 255) {
4903                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4904                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4905                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4906         }
4907
4908         bond_opt_initval(&newval, packets_per_slave);
4909         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4910                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4911                         packets_per_slave, USHRT_MAX);
4912                 packets_per_slave = 1;
4913         }
4914
4915         if (bond_mode == BOND_MODE_ALB) {
4916                 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",
4917                           updelay);
4918         }
4919
4920         if (!miimon) {
4921                 if (updelay || downdelay) {
4922                         /* just warn the user the up/down delay will have
4923                          * no effect since miimon is zero...
4924                          */
4925                         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",
4926                                 updelay, downdelay);
4927                 }
4928         } else {
4929                 /* don't allow arp monitoring */
4930                 if (arp_interval) {
4931                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4932                                 miimon, arp_interval);
4933                         arp_interval = 0;
4934                 }
4935
4936                 if ((updelay % miimon) != 0) {
4937                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4938                                 updelay, miimon, (updelay / miimon) * miimon);
4939                 }
4940
4941                 updelay /= miimon;
4942
4943                 if ((downdelay % miimon) != 0) {
4944                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4945                                 downdelay, miimon,
4946                                 (downdelay / miimon) * miimon);
4947                 }
4948
4949                 downdelay /= miimon;
4950         }
4951
4952         if (arp_interval < 0) {
4953                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4954                         arp_interval, INT_MAX);
4955                 arp_interval = 0;
4956         }
4957
4958         for (arp_ip_count = 0, i = 0;
4959              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4960                 __be32 ip;
4961
4962                 /* not a complete check, but good enough to catch mistakes */
4963                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4964                     !bond_is_ip_target_ok(ip)) {
4965                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4966                                 arp_ip_target[i]);
4967                         arp_interval = 0;
4968                 } else {
4969                         if (bond_get_targets_ip(arp_target, ip) == -1)
4970                                 arp_target[arp_ip_count++] = ip;
4971                         else
4972                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4973                                         &ip);
4974                 }
4975         }
4976
4977         if (arp_interval && !arp_ip_count) {
4978                 /* don't allow arping if no arp_ip_target given... */
4979                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4980                         arp_interval);
4981                 arp_interval = 0;
4982         }
4983
4984         if (arp_validate) {
4985                 if (!arp_interval) {
4986                         pr_err("arp_validate requires arp_interval\n");
4987                         return -EINVAL;
4988                 }
4989
4990                 bond_opt_initstr(&newval, arp_validate);
4991                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4992                                         &newval);
4993                 if (!valptr) {
4994                         pr_err("Error: invalid arp_validate \"%s\"\n",
4995                                arp_validate);
4996                         return -EINVAL;
4997                 }
4998                 arp_validate_value = valptr->value;
4999         } else {
5000                 arp_validate_value = 0;
5001         }
5002
5003         if (arp_all_targets) {
5004                 bond_opt_initstr(&newval, arp_all_targets);
5005                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
5006                                         &newval);
5007                 if (!valptr) {
5008                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
5009                                arp_all_targets);
5010                         arp_all_targets_value = 0;
5011                 } else {
5012                         arp_all_targets_value = valptr->value;
5013                 }
5014         }
5015
5016         if (miimon) {
5017                 pr_info("MII link monitoring set to %d ms\n", miimon);
5018         } else if (arp_interval) {
5019                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
5020                                           arp_validate_value);
5021                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5022                         arp_interval, valptr->string, arp_ip_count);
5023
5024                 for (i = 0; i < arp_ip_count; i++)
5025                         pr_cont(" %s", arp_ip_target[i]);
5026
5027                 pr_cont("\n");
5028
5029         } else if (max_bonds) {
5030                 /* miimon and arp_interval not set, we need one so things
5031                  * work as expected, see bonding.txt for details
5032                  */
5033                 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");
5034         }
5035
5036         if (primary && !bond_mode_uses_primary(bond_mode)) {
5037                 /* currently, using a primary only makes sense
5038                  * in active backup, TLB or ALB modes
5039                  */
5040                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
5041                         primary, bond_mode_name(bond_mode));
5042                 primary = NULL;
5043         }
5044
5045         if (primary && primary_reselect) {
5046                 bond_opt_initstr(&newval, primary_reselect);
5047                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
5048                                         &newval);
5049                 if (!valptr) {
5050                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
5051                                primary_reselect);
5052                         return -EINVAL;
5053                 }
5054                 primary_reselect_value = valptr->value;
5055         } else {
5056                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5057         }
5058
5059         if (fail_over_mac) {
5060                 bond_opt_initstr(&newval, fail_over_mac);
5061                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
5062                                         &newval);
5063                 if (!valptr) {
5064                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
5065                                fail_over_mac);
5066                         return -EINVAL;
5067                 }
5068                 fail_over_mac_value = valptr->value;
5069                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5070                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
5071         } else {
5072                 fail_over_mac_value = BOND_FOM_NONE;
5073         }
5074
5075         bond_opt_initstr(&newval, "default");
5076         valptr = bond_opt_parse(
5077                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
5078                                      &newval);
5079         if (!valptr) {
5080                 pr_err("Error: No ad_actor_sys_prio default value");
5081                 return -EINVAL;
5082         }
5083         ad_actor_sys_prio = valptr->value;
5084
5085         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
5086                                 &newval);
5087         if (!valptr) {
5088                 pr_err("Error: No ad_user_port_key default value");
5089                 return -EINVAL;
5090         }
5091         ad_user_port_key = valptr->value;
5092
5093         bond_opt_initstr(&newval, "default");
5094         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
5095         if (!valptr) {
5096                 pr_err("Error: No tlb_dynamic_lb default value");
5097                 return -EINVAL;
5098         }
5099         tlb_dynamic_lb = valptr->value;
5100
5101         if (lp_interval == 0) {
5102                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
5103                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
5104                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
5105         }
5106
5107         /* fill params struct with the proper values */
5108         params->mode = bond_mode;
5109         params->xmit_policy = xmit_hashtype;
5110         params->miimon = miimon;
5111         params->num_peer_notif = num_peer_notif;
5112         params->arp_interval = arp_interval;
5113         params->arp_validate = arp_validate_value;
5114         params->arp_all_targets = arp_all_targets_value;
5115         params->updelay = updelay;
5116         params->downdelay = downdelay;
5117         params->peer_notif_delay = 0;
5118         params->use_carrier = use_carrier;
5119         params->lacp_fast = lacp_fast;
5120         params->primary[0] = 0;
5121         params->primary_reselect = primary_reselect_value;
5122         params->fail_over_mac = fail_over_mac_value;
5123         params->tx_queues = tx_queues;
5124         params->all_slaves_active = all_slaves_active;
5125         params->resend_igmp = resend_igmp;
5126         params->min_links = min_links;
5127         params->lp_interval = lp_interval;
5128         params->packets_per_slave = packets_per_slave;
5129         params->tlb_dynamic_lb = tlb_dynamic_lb;
5130         params->ad_actor_sys_prio = ad_actor_sys_prio;
5131         eth_zero_addr(params->ad_actor_system);
5132         params->ad_user_port_key = ad_user_port_key;
5133         if (packets_per_slave > 0) {
5134                 params->reciprocal_packets_per_slave =
5135                         reciprocal_value(packets_per_slave);
5136         } else {
5137                 /* reciprocal_packets_per_slave is unused if
5138                  * packets_per_slave is 0 or 1, just initialize it
5139                  */
5140                 params->reciprocal_packets_per_slave =
5141                         (struct reciprocal_value) { 0 };
5142         }
5143
5144         if (primary) {
5145                 strncpy(params->primary, primary, IFNAMSIZ);
5146                 params->primary[IFNAMSIZ - 1] = 0;
5147         }
5148
5149         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5150
5151         return 0;
5152 }
5153
5154 /* Called from registration process */
5155 static int bond_init(struct net_device *bond_dev)
5156 {
5157         struct bonding *bond = netdev_priv(bond_dev);
5158         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5159
5160         netdev_dbg(bond_dev, "Begin bond_init\n");
5161
5162         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
5163         if (!bond->wq)
5164                 return -ENOMEM;
5165
5166         spin_lock_init(&bond->stats_lock);
5167         netdev_lockdep_set_classes(bond_dev);
5168
5169         list_add_tail(&bond->bond_list, &bn->dev_list);
5170
5171         bond_prepare_sysfs_group(bond);
5172
5173         bond_debug_register(bond);
5174
5175         /* Ensure valid dev_addr */
5176         if (is_zero_ether_addr(bond_dev->dev_addr) &&
5177             bond_dev->addr_assign_type == NET_ADDR_PERM)
5178                 eth_hw_addr_random(bond_dev);
5179
5180         return 0;
5181 }
5182
5183 unsigned int bond_get_num_tx_queues(void)
5184 {
5185         return tx_queues;
5186 }
5187
5188 /* Create a new bond based on the specified name and bonding parameters.
5189  * If name is NULL, obtain a suitable "bond%d" name for us.
5190  * Caller must NOT hold rtnl_lock; we need to release it here before we
5191  * set up our sysfs entries.
5192  */
5193 int bond_create(struct net *net, const char *name)
5194 {
5195         struct net_device *bond_dev;
5196         struct bonding *bond;
5197         struct alb_bond_info *bond_info;
5198         int res;
5199
5200         rtnl_lock();
5201
5202         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
5203                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
5204                                    bond_setup, tx_queues);
5205         if (!bond_dev) {
5206                 pr_err("%s: eek! can't alloc netdev!\n", name);
5207                 rtnl_unlock();
5208                 return -ENOMEM;
5209         }
5210
5211         /*
5212          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
5213          * It is set to 0 by default which is wrong.
5214          */
5215         bond = netdev_priv(bond_dev);
5216         bond_info = &(BOND_ALB_INFO(bond));
5217         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
5218
5219         dev_net_set(bond_dev, net);
5220         bond_dev->rtnl_link_ops = &bond_link_ops;
5221
5222         res = register_netdevice(bond_dev);
5223         if (res < 0) {
5224                 free_netdev(bond_dev);
5225                 rtnl_unlock();
5226
5227                 return res;
5228         }
5229
5230         netif_carrier_off(bond_dev);
5231
5232         bond_work_init_all(bond);
5233
5234         rtnl_unlock();
5235         return 0;
5236 }
5237
5238 static int __net_init bond_net_init(struct net *net)
5239 {
5240         struct bond_net *bn = net_generic(net, bond_net_id);
5241
5242         bn->net = net;
5243         INIT_LIST_HEAD(&bn->dev_list);
5244
5245         bond_create_proc_dir(bn);
5246         bond_create_sysfs(bn);
5247
5248         return 0;
5249 }
5250
5251 static void __net_exit bond_net_exit(struct net *net)
5252 {
5253         struct bond_net *bn = net_generic(net, bond_net_id);
5254         struct bonding *bond, *tmp_bond;
5255         LIST_HEAD(list);
5256
5257         bond_destroy_sysfs(bn);
5258
5259         /* Kill off any bonds created after unregistering bond rtnl ops */
5260         rtnl_lock();
5261         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
5262                 unregister_netdevice_queue(bond->dev, &list);
5263         unregister_netdevice_many(&list);
5264         rtnl_unlock();
5265
5266         bond_destroy_proc_dir(bn);
5267 }
5268
5269 static struct pernet_operations bond_net_ops = {
5270         .init = bond_net_init,
5271         .exit = bond_net_exit,
5272         .id   = &bond_net_id,
5273         .size = sizeof(struct bond_net),
5274 };
5275
5276 static int __init bonding_init(void)
5277 {
5278         int i;
5279         int res;
5280
5281         res = bond_check_params(&bonding_defaults);
5282         if (res)
5283                 goto out;
5284
5285         res = register_pernet_subsys(&bond_net_ops);
5286         if (res)
5287                 goto out;
5288
5289         res = bond_netlink_init();
5290         if (res)
5291                 goto err_link;
5292
5293         bond_create_debugfs();
5294
5295         for (i = 0; i < max_bonds; i++) {
5296                 res = bond_create(&init_net, NULL);
5297                 if (res)
5298                         goto err;
5299         }
5300
5301         skb_flow_dissector_init(&flow_keys_bonding,
5302                                 flow_keys_bonding_keys,
5303                                 ARRAY_SIZE(flow_keys_bonding_keys));
5304
5305         register_netdevice_notifier(&bond_netdev_notifier);
5306 out:
5307         return res;
5308 err:
5309         bond_destroy_debugfs();
5310         bond_netlink_fini();
5311 err_link:
5312         unregister_pernet_subsys(&bond_net_ops);
5313         goto out;
5314
5315 }
5316
5317 static void __exit bonding_exit(void)
5318 {
5319         unregister_netdevice_notifier(&bond_netdev_notifier);
5320
5321         bond_destroy_debugfs();
5322
5323         bond_netlink_fini();
5324         unregister_pernet_subsys(&bond_net_ops);
5325
5326 #ifdef CONFIG_NET_POLL_CONTROLLER
5327         /* Make sure we don't have an imbalance on our netpoll blocking */
5328         WARN_ON(atomic_read(&netpoll_block_tx));
5329 #endif
5330 }
5331
5332 module_init(bonding_init);
5333 module_exit(bonding_exit);
5334 MODULE_LICENSE("GPL");
5335 MODULE_DESCRIPTION(DRV_DESCRIPTION);
5336 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");