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 bond_ipsec *ipsec;
 389         struct bonding *bond;
 390         struct slave *slave;
 391         int err;
 392
 393         if (!bond_dev)
 394                 return -EINVAL;
 395
 396         rcu_read_lock();
 397         bond = netdev_priv(bond_dev);
 398         slave = rcu_dereference(bond->curr_active_slave);
 399         if (!slave) {
 400                 rcu_read_unlock();
 401                 return -ENODEV;
 402         }
 403
 404         if (!slave->dev->xfrmdev_ops ||
 405             !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
 406             netif_is_bond_master(slave->dev)) {
 407                 slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n");
 408                 rcu_read_unlock();
 409                 return -EINVAL;
 410         }
 411
 412         ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC);
 413         if (!ipsec) {
 414                 rcu_read_unlock();
 415                 return -ENOMEM;
 416         }
 417         xs->xso.real_dev = slave->dev;
 418
 419         err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs);
 420         if (!err) {
 421                 ipsec->xs = xs;
 422                 INIT_LIST_HEAD(&ipsec->list);
 423                 spin_lock_bh(&bond->ipsec_lock);
 424                 list_add(&ipsec->list, &bond->ipsec_list);
 425                 spin_unlock_bh(&bond->ipsec_lock);
 426         } else {
 427                 kfree(ipsec);
 428         }
 429         rcu_read_unlock();
 430         return err;
 431 }
 432
 433 static void bond_ipsec_add_sa_all(struct bonding *bond)
 434 {
 435         struct net_device *bond_dev = bond->dev;
 436         struct bond_ipsec *ipsec;
 437         struct slave *slave;
 438
 439         rcu_read_lock();
 440         slave = rcu_dereference(bond->curr_active_slave);
 441         if (!slave)
 442                 goto out;
 443
 444         if (!slave->dev->xfrmdev_ops ||
 445             !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
 446             netif_is_bond_master(slave->dev)) {
 447                 spin_lock_bh(&bond->ipsec_lock);
 448                 if (!list_empty(&bond->ipsec_list))
 449                         slave_warn(bond_dev, slave->dev,
 450                                    "%s: no slave xdo_dev_state_add\n",
 451                                    __func__);
 452                 spin_unlock_bh(&bond->ipsec_lock);
 453                 goto out;
 454         }
 455
 456         spin_lock_bh(&bond->ipsec_lock);
 457         list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 458                 ipsec->xs->xso.real_dev = slave->dev;
 459                 if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs)) {
 460                         slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__);
 461                         ipsec->xs->xso.real_dev = NULL;
 462                 }
 463         }
 464         spin_unlock_bh(&bond->ipsec_lock);
 465 out:
 466         rcu_read_unlock();
 467 }
 468
 469 /**
 470  * bond_ipsec_del_sa - clear out this specific SA
 471  * @xs: pointer to transformer state struct
 472  **/
 473 static void bond_ipsec_del_sa(struct xfrm_state *xs)
 474 {
 475         struct net_device *bond_dev = xs->xso.dev;
 476         struct bond_ipsec *ipsec;
 477         struct bonding *bond;
 478         struct slave *slave;
 479
 480         if (!bond_dev)
 481                 return;
 482
 483         rcu_read_lock();
 484         bond = netdev_priv(bond_dev);
 485         slave = rcu_dereference(bond->curr_active_slave);
 486
 487         if (!slave)
 488                 goto out;
 489
 490         if (!xs->xso.real_dev)
 491                 goto out;
 492
 493         WARN_ON(xs->xso.real_dev != slave->dev);
 494
 495         if (!slave->dev->xfrmdev_ops ||
 496             !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
 497             netif_is_bond_master(slave->dev)) {
 498                 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
 499                 goto out;
 500         }
 501
 502         slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
 503 out:
 504         spin_lock_bh(&bond->ipsec_lock);
 505         list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 506                 if (ipsec->xs == xs) {
 507                         list_del(&ipsec->list);
 508                         kfree(ipsec);
 509                         break;
 510                 }
 511         }
 512         spin_unlock_bh(&bond->ipsec_lock);
 513         rcu_read_unlock();
 514 }
 515
 516 static void bond_ipsec_del_sa_all(struct bonding *bond)
 517 {
 518         struct net_device *bond_dev = bond->dev;
 519         struct bond_ipsec *ipsec;
 520         struct slave *slave;
 521
 522         rcu_read_lock();
 523         slave = rcu_dereference(bond->curr_active_slave);
 524         if (!slave) {
 525                 rcu_read_unlock();
 526                 return;
 527         }
 528
 529         spin_lock_bh(&bond->ipsec_lock);
 530         list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 531                 if (!ipsec->xs->xso.real_dev)
 532                         continue;
 533
 534                 if (!slave->dev->xfrmdev_ops ||
 535                     !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
 536                     netif_is_bond_master(slave->dev)) {
 537                         slave_warn(bond_dev, slave->dev,
 538                                    "%s: no slave xdo_dev_state_delete\n",
 539                                    __func__);
 540                 } else {
 541                         slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs);
 542                 }
 543                 ipsec->xs->xso.real_dev = NULL;
 544         }
 545         spin_unlock_bh(&bond->ipsec_lock);
 546         rcu_read_unlock();
 547 }
 548
 549 /**
 550  * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
 551  * @skb: current data packet
 552  * @xs: pointer to transformer state struct
 553  **/
 554 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 555 {
 556         struct net_device *bond_dev = xs->xso.dev;
 557         struct net_device *real_dev;
 558         struct slave *curr_active;
 559         struct bonding *bond;
 560         int err;
 561
 562         bond = netdev_priv(bond_dev);
 563         rcu_read_lock();
 564         curr_active = rcu_dereference(bond->curr_active_slave);
 565         real_dev = curr_active->dev;
 566
 567         if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
 568                 err = false;
 569                 goto out;
 570         }
 571
 572         if (!xs->xso.real_dev) {
 573                 err = false;
 574                 goto out;
 575         }
 576
 577         if (!real_dev->xfrmdev_ops ||
 578             !real_dev->xfrmdev_ops->xdo_dev_offload_ok ||
 579             netif_is_bond_master(real_dev)) {
 580                 err = false;
 581                 goto out;
 582         }
 583
 584         err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
 585 out:
 586         rcu_read_unlock();
 587         return err;
 588 }
 589
 590 static const struct xfrmdev_ops bond_xfrmdev_ops = {
 591         .xdo_dev_state_add = bond_ipsec_add_sa,
 592         .xdo_dev_state_delete = bond_ipsec_del_sa,
 593         .xdo_dev_offload_ok = bond_ipsec_offload_ok,
 594 };
 595 #endif /* CONFIG_XFRM_OFFLOAD */
 596
 597 /*------------------------------- Link status -------------------------------*/
 598
 599 /* Set the carrier state for the master according to the state of its
 600  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 601  * do special 802.3ad magic.
 602  *
 603  * Returns zero if carrier state does not change, nonzero if it does.
 604  */
 605 int bond_set_carrier(struct bonding *bond)
 606 {
 607         struct list_head *iter;
 608         struct slave *slave;
 609
 610         if (!bond_has_slaves(bond))
 611                 goto down;
 612
 613         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 614                 return bond_3ad_set_carrier(bond);
 615
 616         bond_for_each_slave(bond, slave, iter) {
 617                 if (slave->link == BOND_LINK_UP) {
 618                         if (!netif_carrier_ok(bond->dev)) {
 619                                 netif_carrier_on(bond->dev);
 620                                 return 1;
 621                         }
 622                         return 0;
 623                 }
 624         }
 625
 626 down:
 627         if (netif_carrier_ok(bond->dev)) {
 628                 netif_carrier_off(bond->dev);
 629                 return 1;
 630         }
 631         return 0;
 632 }
 633
 634 /* Get link speed and duplex from the slave's base driver
 635  * using ethtool. If for some reason the call fails or the
 636  * values are invalid, set speed and duplex to -1,
 637  * and return. Return 1 if speed or duplex settings are
 638  * UNKNOWN; 0 otherwise.
 639  */
 640 static int bond_update_speed_duplex(struct slave *slave)
 641 {
 642         struct net_device *slave_dev = slave->dev;
 643         struct ethtool_link_ksettings ecmd;
 644         int res;
 645
 646         slave->speed = SPEED_UNKNOWN;
 647         slave->duplex = DUPLEX_UNKNOWN;
 648
 649         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 650         if (res < 0)
 651                 return 1;
 652         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 653                 return 1;
 654         switch (ecmd.base.duplex) {
 655         case DUPLEX_FULL:
 656         case DUPLEX_HALF:
 657                 break;
 658         default:
 659                 return 1;
 660         }
 661
 662         slave->speed = ecmd.base.speed;
 663         slave->duplex = ecmd.base.duplex;
 664
 665         return 0;
 666 }
 667
 668 const char *bond_slave_link_status(s8 link)
 669 {
 670         switch (link) {
 671         case BOND_LINK_UP:
 672                 return "up";
 673         case BOND_LINK_FAIL:
 674                 return "going down";
 675         case BOND_LINK_DOWN:
 676                 return "down";
 677         case BOND_LINK_BACK:
 678                 return "going back";
 679         default:
 680                 return "unknown";
 681         }
 682 }
 683
 684 /* if <dev> supports MII link status reporting, check its link status.
 685  *
 686  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 687  * depending upon the setting of the use_carrier parameter.
 688  *
 689  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 690  * can't tell and just pretend it is), or 0, meaning that the link is
 691  * down.
 692  *
 693  * If reporting is non-zero, instead of faking link up, return -1 if
 694  * both ETHTOOL and MII ioctls fail (meaning the device does not
 695  * support them).  If use_carrier is set, return whatever it says.
 696  * It'd be nice if there was a good way to tell if a driver supports
 697  * netif_carrier, but there really isn't.
 698  */
 699 static int bond_check_dev_link(struct bonding *bond,
 700                                struct net_device *slave_dev, int reporting)
 701 {
 702         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 703         int (*ioctl)(struct net_device *, struct ifreq *, int);
 704         struct ifreq ifr;
 705         struct mii_ioctl_data *mii;
 706
 707         if (!reporting && !netif_running(slave_dev))
 708                 return 0;
 709
 710         if (bond->params.use_carrier)
 711                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 712
 713         /* Try to get link status using Ethtool first. */
 714         if (slave_dev->ethtool_ops->get_link)
 715                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 716                         BMSR_LSTATUS : 0;
 717
 718         /* Ethtool can't be used, fallback to MII ioctls. */
 719         ioctl = slave_ops->ndo_do_ioctl;
 720         if (ioctl) {
 721                 /* TODO: set pointer to correct ioctl on a per team member
 722                  *       bases to make this more efficient. that is, once
 723                  *       we determine the correct ioctl, we will always
 724                  *       call it and not the others for that team
 725                  *       member.
 726                  */
 727
 728                 /* We cannot assume that SIOCGMIIPHY will also read a
 729                  * register; not all network drivers (e.g., e100)
 730                  * support that.
 731                  */
 732
 733                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 734                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 735                 mii = if_mii(&ifr);
 736                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 737                         mii->reg_num = MII_BMSR;
 738                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 739                                 return mii->val_out & BMSR_LSTATUS;
 740                 }
 741         }
 742
 743         /* If reporting, report that either there's no dev->do_ioctl,
 744          * or both SIOCGMIIREG and get_link failed (meaning that we
 745          * cannot report link status).  If not reporting, pretend
 746          * we're ok.
 747          */
 748         return reporting ? -1 : BMSR_LSTATUS;
 749 }
 750
 751 /*----------------------------- Multicast list ------------------------------*/
 752
 753 /* Push the promiscuity flag down to appropriate slaves */
 754 static int bond_set_promiscuity(struct bonding *bond, int inc)
 755 {
 756         struct list_head *iter;
 757         int err = 0;
 758
 759         if (bond_uses_primary(bond)) {
 760                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 761
 762                 if (curr_active)
 763                         err = dev_set_promiscuity(curr_active->dev, inc);
 764         } else {
 765                 struct slave *slave;
 766
 767                 bond_for_each_slave(bond, slave, iter) {
 768                         err = dev_set_promiscuity(slave->dev, inc);
 769                         if (err)
 770                                 return err;
 771                 }
 772         }
 773         return err;
 774 }
 775
 776 /* Push the allmulti flag down to all slaves */
 777 static int bond_set_allmulti(struct bonding *bond, int inc)
 778 {
 779         struct list_head *iter;
 780         int err = 0;
 781
 782         if (bond_uses_primary(bond)) {
 783                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 784
 785                 if (curr_active)
 786                         err = dev_set_allmulti(curr_active->dev, inc);
 787         } else {
 788                 struct slave *slave;
 789
 790                 bond_for_each_slave(bond, slave, iter) {
 791                         err = dev_set_allmulti(slave->dev, inc);
 792                         if (err)
 793                                 return err;
 794                 }
 795         }
 796         return err;
 797 }
 798
 799 /* Retrieve the list of registered multicast addresses for the bonding
 800  * device and retransmit an IGMP JOIN request to the current active
 801  * slave.
 802  */
 803 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 804 {
 805         struct bonding *bond = container_of(work, struct bonding,
 806                                             mcast_work.work);
 807
 808         if (!rtnl_trylock()) {
 809                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 810                 return;
 811         }
 812         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 813
 814         if (bond->igmp_retrans > 1) {
 815                 bond->igmp_retrans--;
 816                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 817         }
 818         rtnl_unlock();
 819 }
 820
 821 /* Flush bond's hardware addresses from slave */
 822 static void bond_hw_addr_flush(struct net_device *bond_dev,
 823                                struct net_device *slave_dev)
 824 {
 825         struct bonding *bond = netdev_priv(bond_dev);
 826
 827         dev_uc_unsync(slave_dev, bond_dev);
 828         dev_mc_unsync(slave_dev, bond_dev);
 829
 830         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 831                 dev_mc_del(slave_dev, lacpdu_mcast_addr);
 832 }
 833
 834 /*--------------------------- Active slave change ---------------------------*/
 835
 836 /* Update the hardware address list and promisc/allmulti for the new and
 837  * old active slaves (if any).  Modes that are not using primary keep all
 838  * slaves up date at all times; only the modes that use primary need to call
 839  * this function to swap these settings during a failover.
 840  */
 841 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 842                               struct slave *old_active)
 843 {
 844         if (old_active) {
 845                 if (bond->dev->flags & IFF_PROMISC)
 846                         dev_set_promiscuity(old_active->dev, -1);
 847
 848                 if (bond->dev->flags & IFF_ALLMULTI)
 849                         dev_set_allmulti(old_active->dev, -1);
 850
 851                 if (bond->dev->flags & IFF_UP)
 852                         bond_hw_addr_flush(bond->dev, old_active->dev);
 853         }
 854
 855         if (new_active) {
 856                 /* FIXME: Signal errors upstream. */
 857                 if (bond->dev->flags & IFF_PROMISC)
 858                         dev_set_promiscuity(new_active->dev, 1);
 859
 860                 if (bond->dev->flags & IFF_ALLMULTI)
 861                         dev_set_allmulti(new_active->dev, 1);
 862
 863                 if (bond->dev->flags & IFF_UP) {
 864                         netif_addr_lock_bh(bond->dev);
 865                         dev_uc_sync(new_active->dev, bond->dev);
 866                         dev_mc_sync(new_active->dev, bond->dev);
 867                         netif_addr_unlock_bh(bond->dev);
 868                 }
 869         }
 870 }
 871
 872 /**
 873  * bond_set_dev_addr - clone slave's address to bond
 874  * @bond_dev: bond net device
 875  * @slave_dev: slave net device
 876  *
 877  * Should be called with RTNL held.
 878  */
 879 static int bond_set_dev_addr(struct net_device *bond_dev,
 880                              struct net_device *slave_dev)
 881 {
 882         int err;
 883
 884         slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 885                   bond_dev, slave_dev, slave_dev->addr_len);
 886         err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 887         if (err)
 888                 return err;
 889
 890         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 891         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 892         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 893         return 0;
 894 }
 895
 896 static struct slave *bond_get_old_active(struct bonding *bond,
 897                                          struct slave *new_active)
 898 {
 899         struct slave *slave;
 900         struct list_head *iter;
 901
 902         bond_for_each_slave(bond, slave, iter) {
 903                 if (slave == new_active)
 904                         continue;
 905
 906                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 907                         return slave;
 908         }
 909
 910         return NULL;
 911 }
 912
 913 /* bond_do_fail_over_mac
 914  *
 915  * Perform special MAC address swapping for fail_over_mac settings
 916  *
 917  * Called with RTNL
 918  */
 919 static void bond_do_fail_over_mac(struct bonding *bond,
 920                                   struct slave *new_active,
 921                                   struct slave *old_active)
 922 {
 923         u8 tmp_mac[MAX_ADDR_LEN];
 924         struct sockaddr_storage ss;
 925         int rv;
 926
 927         switch (bond->params.fail_over_mac) {
 928         case BOND_FOM_ACTIVE:
 929                 if (new_active) {
 930                         rv = bond_set_dev_addr(bond->dev, new_active->dev);
 931                         if (rv)
 932                                 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
 933                                           -rv);
 934                 }
 935                 break;
 936         case BOND_FOM_FOLLOW:
 937                 /* if new_active && old_active, swap them
 938                  * if just old_active, do nothing (going to no active slave)
 939                  * if just new_active, set new_active to bond's MAC
 940                  */
 941                 if (!new_active)
 942                         return;
 943
 944                 if (!old_active)
 945                         old_active = bond_get_old_active(bond, new_active);
 946
 947                 if (old_active) {
 948                         bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 949                                           new_active->dev->addr_len);
 950                         bond_hw_addr_copy(ss.__data,
 951                                           old_active->dev->dev_addr,
 952                                           old_active->dev->addr_len);
 953                         ss.ss_family = new_active->dev->type;
 954                 } else {
 955                         bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 956                                           bond->dev->addr_len);
 957                         ss.ss_family = bond->dev->type;
 958                 }
 959
 960                 rv = dev_set_mac_address(new_active->dev,
 961                                          (struct sockaddr *)&ss, NULL);
 962                 if (rv) {
 963                         slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
 964                                   -rv);
 965                         goto out;
 966                 }
 967
 968                 if (!old_active)
 969                         goto out;
 970
 971                 bond_hw_addr_copy(ss.__data, tmp_mac,
 972                                   new_active->dev->addr_len);
 973                 ss.ss_family = old_active->dev->type;
 974
 975                 rv = dev_set_mac_address(old_active->dev,
 976                                          (struct sockaddr *)&ss, NULL);
 977                 if (rv)
 978                         slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
 979                                   -rv);
 980 out:
 981                 break;
 982         default:
 983                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 984                            bond->params.fail_over_mac);
 985                 break;
 986         }
 987
 988 }
 989
 990 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
 991 {
 992         struct slave *prim = rtnl_dereference(bond->primary_slave);
 993         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 994
 995         if (!prim || prim->link != BOND_LINK_UP) {
 996                 if (!curr || curr->link != BOND_LINK_UP)
 997                         return NULL;
 998                 return curr;
 999         }
1000
1001         if (bond->force_primary) {
1002                 bond->force_primary = false;
1003                 return prim;
1004         }
1005
1006         if (!curr || curr->link != BOND_LINK_UP)
1007                 return prim;
1008
1009         /* At this point, prim and curr are both up */
1010         switch (bond->params.primary_reselect) {
1011         case BOND_PRI_RESELECT_ALWAYS:
1012                 return prim;
1013         case BOND_PRI_RESELECT_BETTER:
1014                 if (prim->speed < curr->speed)
1015                         return curr;
1016                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
1017                         return curr;
1018                 return prim;
1019         case BOND_PRI_RESELECT_FAILURE:
1020                 return curr;
1021         default:
1022                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
1023                            bond->params.primary_reselect);
1024                 return curr;
1025         }
1026 }
1027
1028 /**
1029  * bond_find_best_slave - select the best available slave to be the active one
1030  * @bond: our bonding struct
1031  */
1032 static struct slave *bond_find_best_slave(struct bonding *bond)
1033 {
1034         struct slave *slave, *bestslave = NULL;
1035         struct list_head *iter;
1036         int mintime = bond->params.updelay;
1037
1038         slave = bond_choose_primary_or_current(bond);
1039         if (slave)
1040                 return slave;
1041
1042         bond_for_each_slave(bond, slave, iter) {
1043                 if (slave->link == BOND_LINK_UP)
1044                         return slave;
1045                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
1046                     slave->delay < mintime) {
1047                         mintime = slave->delay;
1048                         bestslave = slave;
1049                 }
1050         }
1051
1052         return bestslave;
1053 }
1054
1055 static bool bond_should_notify_peers(struct bonding *bond)
1056 {
1057         struct slave *slave;
1058
1059         rcu_read_lock();
1060         slave = rcu_dereference(bond->curr_active_slave);
1061         rcu_read_unlock();
1062
1063         if (!slave || !bond->send_peer_notif ||
1064             bond->send_peer_notif %
1065             max(1, bond->params.peer_notif_delay) != 0 ||
1066             !netif_carrier_ok(bond->dev) ||
1067             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1068                 return false;
1069
1070         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
1071                    slave ? slave->dev->name : "NULL");
1072
1073         return true;
1074 }
1075
1076 /**
1077  * change_active_interface - change the active slave into the specified one
1078  * @bond: our bonding struct
1079  * @new_active: the new slave to make the active one
1080  *
1081  * Set the new slave to the bond's settings and unset them on the old
1082  * curr_active_slave.
1083  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1084  *
1085  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1086  * because it is apparently the best available slave we have, even though its
1087  * updelay hasn't timed out yet.
1088  *
1089  * Caller must hold RTNL.
1090  */
1091 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1092 {
1093         struct slave *old_active;
1094
1095         ASSERT_RTNL();
1096
1097         old_active = rtnl_dereference(bond->curr_active_slave);
1098
1099         if (old_active == new_active)
1100                 return;
1101
1102 #ifdef CONFIG_XFRM_OFFLOAD
1103         bond_ipsec_del_sa_all(bond);
1104 #endif /* CONFIG_XFRM_OFFLOAD */
1105
1106         if (new_active) {
1107                 new_active->last_link_up = jiffies;
1108
1109                 if (new_active->link == BOND_LINK_BACK) {
1110                         if (bond_uses_primary(bond)) {
1111                                 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
1112                                            (bond->params.updelay - new_active->delay) * bond->params.miimon);
1113                         }
1114
1115                         new_active->delay = 0;
1116                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
1117                                                   BOND_SLAVE_NOTIFY_NOW);
1118
1119                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1120                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1121
1122                         if (bond_is_lb(bond))
1123                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1124                 } else {
1125                         if (bond_uses_primary(bond)) {
1126                                 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1127                         }
1128                 }
1129         }
1130
1131         if (bond_uses_primary(bond))
1132                 bond_hw_addr_swap(bond, new_active, old_active);
1133
1134         if (bond_is_lb(bond)) {
1135                 bond_alb_handle_active_change(bond, new_active);
1136                 if (old_active)
1137                         bond_set_slave_inactive_flags(old_active,
1138                                                       BOND_SLAVE_NOTIFY_NOW);
1139                 if (new_active)
1140                         bond_set_slave_active_flags(new_active,
1141                                                     BOND_SLAVE_NOTIFY_NOW);
1142         } else {
1143                 rcu_assign_pointer(bond->curr_active_slave, new_active);
1144         }
1145
1146         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1147                 if (old_active)
1148                         bond_set_slave_inactive_flags(old_active,
1149                                                       BOND_SLAVE_NOTIFY_NOW);
1150
1151                 if (new_active) {
1152                         bool should_notify_peers = false;
1153
1154                         bond_set_slave_active_flags(new_active,
1155                                                     BOND_SLAVE_NOTIFY_NOW);
1156
1157                         if (bond->params.fail_over_mac)
1158                                 bond_do_fail_over_mac(bond, new_active,
1159                                                       old_active);
1160
1161                         if (netif_running(bond->dev)) {
1162                                 bond->send_peer_notif =
1163                                         bond->params.num_peer_notif *
1164                                         max(1, bond->params.peer_notif_delay);
1165                                 should_notify_peers =
1166                                         bond_should_notify_peers(bond);
1167                         }
1168
1169                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1170                         if (should_notify_peers) {
1171                                 bond->send_peer_notif--;
1172                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1173                                                          bond->dev);
1174                         }
1175                 }
1176         }
1177
1178 #ifdef CONFIG_XFRM_OFFLOAD
1179         bond_ipsec_add_sa_all(bond);
1180 #endif /* CONFIG_XFRM_OFFLOAD */
1181
1182         /* resend IGMP joins since active slave has changed or
1183          * all were sent on curr_active_slave.
1184          * resend only if bond is brought up with the affected
1185          * bonding modes and the retransmission is enabled
1186          */
1187         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1188             ((bond_uses_primary(bond) && new_active) ||
1189              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1190                 bond->igmp_retrans = bond->params.resend_igmp;
1191                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1192         }
1193 }
1194
1195 /**
1196  * bond_select_active_slave - select a new active slave, if needed
1197  * @bond: our bonding struct
1198  *
1199  * This functions should be called when one of the following occurs:
1200  * - The old curr_active_slave has been released or lost its link.
1201  * - The primary_slave has got its link back.
1202  * - A slave has got its link back and there's no old curr_active_slave.
1203  *
1204  * Caller must hold RTNL.
1205  */
1206 void bond_select_active_slave(struct bonding *bond)
1207 {
1208         struct slave *best_slave;
1209         int rv;
1210
1211         ASSERT_RTNL();
1212
1213         best_slave = bond_find_best_slave(bond);
1214         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1215                 bond_change_active_slave(bond, best_slave);
1216                 rv = bond_set_carrier(bond);
1217                 if (!rv)
1218                         return;
1219
1220                 if (netif_carrier_ok(bond->dev))
1221                         netdev_info(bond->dev, "active interface up!\n");
1222                 else
1223                         netdev_info(bond->dev, "now running without any active interface!\n");
1224         }
1225 }
1226
1227 #ifdef CONFIG_NET_POLL_CONTROLLER
1228 static inline int slave_enable_netpoll(struct slave *slave)
1229 {
1230         struct netpoll *np;
1231         int err = 0;
1232
1233         np = kzalloc(sizeof(*np), GFP_KERNEL);
1234         err = -ENOMEM;
1235         if (!np)
1236                 goto out;
1237
1238         err = __netpoll_setup(np, slave->dev);
1239         if (err) {
1240                 kfree(np);
1241                 goto out;
1242         }
1243         slave->np = np;
1244 out:
1245         return err;
1246 }
1247 static inline void slave_disable_netpoll(struct slave *slave)
1248 {
1249         struct netpoll *np = slave->np;
1250
1251         if (!np)
1252                 return;
1253
1254         slave->np = NULL;
1255
1256         __netpoll_free(np);
1257 }
1258
1259 static void bond_poll_controller(struct net_device *bond_dev)
1260 {
1261         struct bonding *bond = netdev_priv(bond_dev);
1262         struct slave *slave = NULL;
1263         struct list_head *iter;
1264         struct ad_info ad_info;
1265
1266         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1267                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
1268                         return;
1269
1270         bond_for_each_slave_rcu(bond, slave, iter) {
1271                 if (!bond_slave_is_up(slave))
1272                         continue;
1273
1274                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1275                         struct aggregator *agg =
1276                             SLAVE_AD_INFO(slave)->port.aggregator;
1277
1278                         if (agg &&
1279                             agg->aggregator_identifier != ad_info.aggregator_id)
1280                                 continue;
1281                 }
1282
1283                 netpoll_poll_dev(slave->dev);
1284         }
1285 }
1286
1287 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1288 {
1289         struct bonding *bond = netdev_priv(bond_dev);
1290         struct list_head *iter;
1291         struct slave *slave;
1292
1293         bond_for_each_slave(bond, slave, iter)
1294                 if (bond_slave_is_up(slave))
1295                         slave_disable_netpoll(slave);
1296 }
1297
1298 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1299 {
1300         struct bonding *bond = netdev_priv(dev);
1301         struct list_head *iter;
1302         struct slave *slave;
1303         int err = 0;
1304
1305         bond_for_each_slave(bond, slave, iter) {
1306                 err = slave_enable_netpoll(slave);
1307                 if (err) {
1308                         bond_netpoll_cleanup(dev);
1309                         break;
1310                 }
1311         }
1312         return err;
1313 }
1314 #else
1315 static inline int slave_enable_netpoll(struct slave *slave)
1316 {
1317         return 0;
1318 }
1319 static inline void slave_disable_netpoll(struct slave *slave)
1320 {
1321 }
1322 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1323 {
1324 }
1325 #endif
1326
1327 /*---------------------------------- IOCTL ----------------------------------*/
1328
1329 static netdev_features_t bond_fix_features(struct net_device *dev,
1330                                            netdev_features_t features)
1331 {
1332         struct bonding *bond = netdev_priv(dev);
1333         struct list_head *iter;
1334         netdev_features_t mask;
1335         struct slave *slave;
1336
1337         mask = features;
1338
1339         features &= ~NETIF_F_ONE_FOR_ALL;
1340         features |= NETIF_F_ALL_FOR_ALL;
1341
1342         bond_for_each_slave(bond, slave, iter) {
1343                 features = netdev_increment_features(features,
1344                                                      slave->dev->features,
1345                                                      mask);
1346         }
1347         features = netdev_add_tso_features(features, mask);
1348
1349         return features;
1350 }
1351
1352 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1353                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1354                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1355
1356 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1357                                  NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1358
1359 #define BOND_MPLS_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1360                                  NETIF_F_ALL_TSO)
1361
1362
1363 static void bond_compute_features(struct bonding *bond)
1364 {
1365         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1366                                         IFF_XMIT_DST_RELEASE_PERM;
1367         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1368         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1369 #ifdef CONFIG_XFRM_OFFLOAD
1370         netdev_features_t xfrm_features  = BOND_XFRM_FEATURES;
1371 #endif /* CONFIG_XFRM_OFFLOAD */
1372         netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1373         struct net_device *bond_dev = bond->dev;
1374         struct list_head *iter;
1375         struct slave *slave;
1376         unsigned short max_hard_header_len = ETH_HLEN;
1377         unsigned int gso_max_size = GSO_MAX_SIZE;
1378         u16 gso_max_segs = GSO_MAX_SEGS;
1379
1380         if (!bond_has_slaves(bond))
1381                 goto done;
1382         vlan_features &= NETIF_F_ALL_FOR_ALL;
1383         mpls_features &= NETIF_F_ALL_FOR_ALL;
1384
1385         bond_for_each_slave(bond, slave, iter) {
1386                 vlan_features = netdev_increment_features(vlan_features,
1387                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1388
1389                 enc_features = netdev_increment_features(enc_features,
1390                                                          slave->dev->hw_enc_features,
1391                                                          BOND_ENC_FEATURES);
1392
1393 #ifdef CONFIG_XFRM_OFFLOAD
1394                 xfrm_features = netdev_increment_features(xfrm_features,
1395                                                           slave->dev->hw_enc_features,
1396                                                           BOND_XFRM_FEATURES);
1397 #endif /* CONFIG_XFRM_OFFLOAD */
1398
1399                 mpls_features = netdev_increment_features(mpls_features,
1400                                                           slave->dev->mpls_features,
1401                                                           BOND_MPLS_FEATURES);
1402
1403                 dst_release_flag &= slave->dev->priv_flags;
1404                 if (slave->dev->hard_header_len > max_hard_header_len)
1405                         max_hard_header_len = slave->dev->hard_header_len;
1406
1407                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1408                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1409         }
1410         bond_dev->hard_header_len = max_hard_header_len;
1411
1412 done:
1413         bond_dev->vlan_features = vlan_features;
1414         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1415                                     NETIF_F_HW_VLAN_CTAG_TX |
1416                                     NETIF_F_HW_VLAN_STAG_TX |
1417                                     NETIF_F_GSO_UDP_L4;
1418 #ifdef CONFIG_XFRM_OFFLOAD
1419         bond_dev->hw_enc_features |= xfrm_features;
1420 #endif /* CONFIG_XFRM_OFFLOAD */
1421         bond_dev->mpls_features = mpls_features;
1422         bond_dev->gso_max_segs = gso_max_segs;
1423         netif_set_gso_max_size(bond_dev, gso_max_size);
1424
1425         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1426         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1427             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1428                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1429
1430         netdev_change_features(bond_dev);
1431 }
1432
1433 static void bond_setup_by_slave(struct net_device *bond_dev,
1434                                 struct net_device *slave_dev)
1435 {
1436         bool was_up = !!(bond_dev->flags & IFF_UP);
1437
1438         dev_close(bond_dev);
1439
1440         bond_dev->header_ops        = slave_dev->header_ops;
1441
1442         bond_dev->type              = slave_dev->type;
1443         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1444         bond_dev->needed_headroom   = slave_dev->needed_headroom;
1445         bond_dev->addr_len          = slave_dev->addr_len;
1446
1447         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1448                 slave_dev->addr_len);
1449
1450         if (slave_dev->flags & IFF_POINTOPOINT) {
1451                 bond_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
1452                 bond_dev->flags |= (IFF_POINTOPOINT | IFF_NOARP);
1453         }
1454         if (was_up)
1455                 dev_open(bond_dev, NULL);
1456 }
1457
1458 /* On bonding slaves other than the currently active slave, suppress
1459  * duplicates except for alb non-mcast/bcast.
1460  */
1461 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1462                                             struct slave *slave,
1463                                             struct bonding *bond)
1464 {
1465         if (bond_is_slave_inactive(slave)) {
1466                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1467                     skb->pkt_type != PACKET_BROADCAST &&
1468                     skb->pkt_type != PACKET_MULTICAST)
1469                         return false;
1470                 return true;
1471         }
1472         return false;
1473 }
1474
1475 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1476 {
1477         struct sk_buff *skb = *pskb;
1478         struct slave *slave;
1479         struct bonding *bond;
1480         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1481                           struct slave *);
1482         int ret = RX_HANDLER_ANOTHER;
1483
1484         skb = skb_share_check(skb, GFP_ATOMIC);
1485         if (unlikely(!skb))
1486                 return RX_HANDLER_CONSUMED;
1487
1488         *pskb = skb;
1489
1490         slave = bond_slave_get_rcu(skb->dev);
1491         bond = slave->bond;
1492
1493         recv_probe = READ_ONCE(bond->recv_probe);
1494         if (recv_probe) {
1495                 ret = recv_probe(skb, bond, slave);
1496                 if (ret == RX_HANDLER_CONSUMED) {
1497                         consume_skb(skb);
1498                         return ret;
1499                 }
1500         }
1501
1502         /*
1503          * For packets determined by bond_should_deliver_exact_match() call to
1504          * be suppressed we want to make an exception for link-local packets.
1505          * This is necessary for e.g. LLDP daemons to be able to monitor
1506          * inactive slave links without being forced to bind to them
1507          * explicitly.
1508          *
1509          * At the same time, packets that are passed to the bonding master
1510          * (including link-local ones) can have their originating interface
1511          * determined via PACKET_ORIGDEV socket option.
1512          */
1513         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1514                 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1515                         return RX_HANDLER_PASS;
1516                 return RX_HANDLER_EXACT;
1517         }
1518
1519         skb->dev = bond->dev;
1520
1521         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1522             netif_is_bridge_port(bond->dev) &&
1523             skb->pkt_type == PACKET_HOST) {
1524
1525                 if (unlikely(skb_cow_head(skb,
1526                                           skb->data - skb_mac_header(skb)))) {
1527                         kfree_skb(skb);
1528                         return RX_HANDLER_CONSUMED;
1529                 }
1530                 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1531                                   bond->dev->addr_len);
1532         }
1533
1534         return ret;
1535 }
1536
1537 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1538 {
1539         switch (BOND_MODE(bond)) {
1540         case BOND_MODE_ROUNDROBIN:
1541                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1542         case BOND_MODE_ACTIVEBACKUP:
1543                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1544         case BOND_MODE_BROADCAST:
1545                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1546         case BOND_MODE_XOR:
1547         case BOND_MODE_8023AD:
1548                 return NETDEV_LAG_TX_TYPE_HASH;
1549         default:
1550                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1551         }
1552 }
1553
1554 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1555                                                enum netdev_lag_tx_type type)
1556 {
1557         if (type != NETDEV_LAG_TX_TYPE_HASH)
1558                 return NETDEV_LAG_HASH_NONE;
1559
1560         switch (bond->params.xmit_policy) {
1561         case BOND_XMIT_POLICY_LAYER2:
1562                 return NETDEV_LAG_HASH_L2;
1563         case BOND_XMIT_POLICY_LAYER34:
1564                 return NETDEV_LAG_HASH_L34;
1565         case BOND_XMIT_POLICY_LAYER23:
1566                 return NETDEV_LAG_HASH_L23;
1567         case BOND_XMIT_POLICY_ENCAP23:
1568                 return NETDEV_LAG_HASH_E23;
1569         case BOND_XMIT_POLICY_ENCAP34:
1570                 return NETDEV_LAG_HASH_E34;
1571         default:
1572                 return NETDEV_LAG_HASH_UNKNOWN;
1573         }
1574 }
1575
1576 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1577                                       struct netlink_ext_ack *extack)
1578 {
1579         struct netdev_lag_upper_info lag_upper_info;
1580         enum netdev_lag_tx_type type;
1581
1582         type = bond_lag_tx_type(bond);
1583         lag_upper_info.tx_type = type;
1584         lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1585
1586         return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1587                                             &lag_upper_info, extack);
1588 }
1589
1590 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1591 {
1592         netdev_upper_dev_unlink(slave->dev, bond->dev);
1593         slave->dev->flags &= ~IFF_SLAVE;
1594 }
1595
1596 static void slave_kobj_release(struct kobject *kobj)
1597 {
1598         struct slave *slave = to_slave(kobj);
1599         struct bonding *bond = bond_get_bond_by_slave(slave);
1600
1601         cancel_delayed_work_sync(&slave->notify_work);
1602         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1603                 kfree(SLAVE_AD_INFO(slave));
1604
1605         kfree(slave);
1606 }
1607
1608 static struct kobj_type slave_ktype = {
1609         .release = slave_kobj_release,
1610 #ifdef CONFIG_SYSFS
1611         .sysfs_ops = &slave_sysfs_ops,
1612 #endif
1613 };
1614
1615 static int bond_kobj_init(struct slave *slave)
1616 {
1617         int err;
1618
1619         err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1620                                    &(slave->dev->dev.kobj), "bonding_slave");
1621         if (err)
1622                 kobject_put(&slave->kobj);
1623
1624         return err;
1625 }
1626
1627 static struct slave *bond_alloc_slave(struct bonding *bond,
1628                                       struct net_device *slave_dev)
1629 {
1630         struct slave *slave = NULL;
1631
1632         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1633         if (!slave)
1634                 return NULL;
1635
1636         slave->bond = bond;
1637         slave->dev = slave_dev;
1638         INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1639
1640         if (bond_kobj_init(slave))
1641                 return NULL;
1642
1643         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1644                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1645                                                GFP_KERNEL);
1646                 if (!SLAVE_AD_INFO(slave)) {
1647                         kobject_put(&slave->kobj);
1648                         return NULL;
1649                 }
1650         }
1651
1652         return slave;
1653 }
1654
1655 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1656 {
1657         info->bond_mode = BOND_MODE(bond);
1658         info->miimon = bond->params.miimon;
1659         info->num_slaves = bond->slave_cnt;
1660 }
1661
1662 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1663 {
1664         strcpy(info->slave_name, slave->dev->name);
1665         info->link = slave->link;
1666         info->state = bond_slave_state(slave);
1667         info->link_failure_count = slave->link_failure_count;
1668 }
1669
1670 static void bond_netdev_notify_work(struct work_struct *_work)
1671 {
1672         struct slave *slave = container_of(_work, struct slave,
1673                                            notify_work.work);
1674
1675         if (rtnl_trylock()) {
1676                 struct netdev_bonding_info binfo;
1677
1678                 bond_fill_ifslave(slave, &binfo.slave);
1679                 bond_fill_ifbond(slave->bond, &binfo.master);
1680                 netdev_bonding_info_change(slave->dev, &binfo);
1681                 rtnl_unlock();
1682         } else {
1683                 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1684         }
1685 }
1686
1687 void bond_queue_slave_event(struct slave *slave)
1688 {
1689         queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1690 }
1691
1692 void bond_lower_state_changed(struct slave *slave)
1693 {
1694         struct netdev_lag_lower_state_info info;
1695
1696         info.link_up = slave->link == BOND_LINK_UP ||
1697                        slave->link == BOND_LINK_FAIL;
1698         info.tx_enabled = bond_is_active_slave(slave);
1699         netdev_lower_state_changed(slave->dev, &info);
1700 }
1701
1702 /* enslave device <slave> to bond device <master> */
1703 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1704                  struct netlink_ext_ack *extack)
1705 {
1706         struct bonding *bond = netdev_priv(bond_dev);
1707         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1708         struct slave *new_slave = NULL, *prev_slave;
1709         struct sockaddr_storage ss;
1710         int link_reporting;
1711         int res = 0, i;
1712
1713         if (!bond->params.use_carrier &&
1714             slave_dev->ethtool_ops->get_link == NULL &&
1715             slave_ops->ndo_do_ioctl == NULL) {
1716                 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1717         }
1718
1719         /* already in-use? */
1720         if (netdev_is_rx_handler_busy(slave_dev)) {
1721                 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1722                 slave_err(bond_dev, slave_dev,
1723                           "Error: Device is in use and cannot be enslaved\n");
1724                 return -EBUSY;
1725         }
1726
1727         if (bond_dev == slave_dev) {
1728                 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1729                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1730                 return -EPERM;
1731         }
1732
1733         /* vlan challenged mutual exclusion */
1734         /* no need to lock since we're protected by rtnl_lock */
1735         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1736                 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1737                 if (vlan_uses_dev(bond_dev)) {
1738                         NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1739                         slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1740                         return -EPERM;
1741                 } else {
1742                         slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1743                 }
1744         } else {
1745                 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1746         }
1747
1748         if (slave_dev->features & NETIF_F_HW_ESP)
1749                 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1750
1751         /* Old ifenslave binaries are no longer supported.  These can
1752          * be identified with moderate accuracy by the state of the slave:
1753          * the current ifenslave will set the interface down prior to
1754          * enslaving it; the old ifenslave will not.
1755          */
1756         if (slave_dev->flags & IFF_UP) {
1757                 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1758                 slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1759                 return -EPERM;
1760         }
1761
1762         /* set bonding device ether type by slave - bonding netdevices are
1763          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1764          * there is a need to override some of the type dependent attribs/funcs.
1765          *
1766          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1767          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1768          */
1769         if (!bond_has_slaves(bond)) {
1770                 if (bond_dev->type != slave_dev->type) {
1771                         slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1772                                   bond_dev->type, slave_dev->type);
1773
1774                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1775                                                        bond_dev);
1776                         res = notifier_to_errno(res);
1777                         if (res) {
1778                                 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1779                                 return -EBUSY;
1780                         }
1781
1782                         /* Flush unicast and multicast addresses */
1783                         dev_uc_flush(bond_dev);
1784                         dev_mc_flush(bond_dev);
1785
1786                         if (slave_dev->type != ARPHRD_ETHER)
1787                                 bond_setup_by_slave(bond_dev, slave_dev);
1788                         else {
1789                                 ether_setup(bond_dev);
1790                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1791                         }
1792
1793                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1794                                                  bond_dev);
1795                 }
1796         } else if (bond_dev->type != slave_dev->type) {
1797                 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1798                 slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1799                           slave_dev->type, bond_dev->type);
1800                 return -EINVAL;
1801         }
1802
1803         if (slave_dev->type == ARPHRD_INFINIBAND &&
1804             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1805                 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1806                 slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1807                            slave_dev->type);
1808                 res = -EOPNOTSUPP;
1809                 goto err_undo_flags;
1810         }
1811
1812         if (!slave_ops->ndo_set_mac_address ||
1813             slave_dev->type == ARPHRD_INFINIBAND) {
1814                 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1815                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1816                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1817                         if (!bond_has_slaves(bond)) {
1818                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1819                                 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1820                         } else {
1821                                 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1822                                 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");
1823                                 res = -EOPNOTSUPP;
1824                                 goto err_undo_flags;
1825                         }
1826                 }
1827         }
1828
1829         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1830
1831         /* If this is the first slave, then we need to set the master's hardware
1832          * address to be the same as the slave's.
1833          */
1834         if (!bond_has_slaves(bond) &&
1835             bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1836                 res = bond_set_dev_addr(bond->dev, slave_dev);
1837                 if (res)
1838                         goto err_undo_flags;
1839         }
1840
1841         new_slave = bond_alloc_slave(bond, slave_dev);
1842         if (!new_slave) {
1843                 res = -ENOMEM;
1844                 goto err_undo_flags;
1845         }
1846
1847         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1848          * is set via sysfs or module option if desired.
1849          */
1850         new_slave->queue_id = 0;
1851
1852         /* Save slave's original mtu and then set it to match the bond */
1853         new_slave->original_mtu = slave_dev->mtu;
1854         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1855         if (res) {
1856                 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1857                 goto err_free;
1858         }
1859
1860         /* Save slave's original ("permanent") mac address for modes
1861          * that need it, and for restoring it upon release, and then
1862          * set it to the master's address
1863          */
1864         bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1865                           slave_dev->addr_len);
1866
1867         if (!bond->params.fail_over_mac ||
1868             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1869                 /* Set slave to master's mac address.  The application already
1870                  * set the master's mac address to that of the first slave
1871                  */
1872                 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1873                 ss.ss_family = slave_dev->type;
1874                 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1875                                           extack);
1876                 if (res) {
1877                         slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1878                         goto err_restore_mtu;
1879                 }
1880         }
1881
1882         /* set slave flag before open to prevent IPv6 addrconf */
1883         slave_dev->flags |= IFF_SLAVE;
1884
1885         /* open the slave since the application closed it */
1886         res = dev_open(slave_dev, extack);
1887         if (res) {
1888                 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1889                 goto err_restore_mac;
1890         }
1891
1892         slave_dev->priv_flags |= IFF_BONDING;
1893         /* initialize slave stats */
1894         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1895
1896         if (bond_is_lb(bond)) {
1897                 /* bond_alb_init_slave() must be called before all other stages since
1898                  * it might fail and we do not want to have to undo everything
1899                  */
1900                 res = bond_alb_init_slave(bond, new_slave);
1901                 if (res)
1902                         goto err_close;
1903         }
1904
1905         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1906         if (res) {
1907                 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1908                 goto err_close;
1909         }
1910
1911         prev_slave = bond_last_slave(bond);
1912
1913         new_slave->delay = 0;
1914         new_slave->link_failure_count = 0;
1915
1916         if (bond_update_speed_duplex(new_slave) &&
1917             bond_needs_speed_duplex(bond))
1918                 new_slave->link = BOND_LINK_DOWN;
1919
1920         new_slave->last_rx = jiffies -
1921                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1922         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1923                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1924
1925         if (bond->params.miimon && !bond->params.use_carrier) {
1926                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1927
1928                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1929                         /* miimon is set but a bonded network driver
1930                          * does not support ETHTOOL/MII and
1931                          * arp_interval is not set.  Note: if
1932                          * use_carrier is enabled, we will never go
1933                          * here (because netif_carrier is always
1934                          * supported); thus, we don't need to change
1935                          * the messages for netif_carrier.
1936                          */
1937                         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");
1938                 } else if (link_reporting == -1) {
1939                         /* unable get link status using mii/ethtool */
1940                         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");
1941                 }
1942         }
1943
1944         /* check for initial state */
1945         new_slave->link = BOND_LINK_NOCHANGE;
1946         if (bond->params.miimon) {
1947                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1948                         if (bond->params.updelay) {
1949                                 bond_set_slave_link_state(new_slave,
1950                                                           BOND_LINK_BACK,
1951                                                           BOND_SLAVE_NOTIFY_NOW);
1952                                 new_slave->delay = bond->params.updelay;
1953                         } else {
1954                                 bond_set_slave_link_state(new_slave,
1955                                                           BOND_LINK_UP,
1956                                                           BOND_SLAVE_NOTIFY_NOW);
1957                         }
1958                 } else {
1959                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1960                                                   BOND_SLAVE_NOTIFY_NOW);
1961                 }
1962         } else if (bond->params.arp_interval) {
1963                 bond_set_slave_link_state(new_slave,
1964                                           (netif_carrier_ok(slave_dev) ?
1965                                           BOND_LINK_UP : BOND_LINK_DOWN),
1966                                           BOND_SLAVE_NOTIFY_NOW);
1967         } else {
1968                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1969                                           BOND_SLAVE_NOTIFY_NOW);
1970         }
1971
1972         if (new_slave->link != BOND_LINK_DOWN)
1973                 new_slave->last_link_up = jiffies;
1974         slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1975                   new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1976                   (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1977
1978         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1979                 /* if there is a primary slave, remember it */
1980                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1981                         rcu_assign_pointer(bond->primary_slave, new_slave);
1982                         bond->force_primary = true;
1983                 }
1984         }
1985
1986         switch (BOND_MODE(bond)) {
1987         case BOND_MODE_ACTIVEBACKUP:
1988                 bond_set_slave_inactive_flags(new_slave,
1989                                               BOND_SLAVE_NOTIFY_NOW);
1990                 break;
1991         case BOND_MODE_8023AD:
1992                 /* in 802.3ad mode, the internal mechanism
1993                  * will activate the slaves in the selected
1994                  * aggregator
1995                  */
1996                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1997                 /* if this is the first slave */
1998                 if (!prev_slave) {
1999                         SLAVE_AD_INFO(new_slave)->id = 1;
2000                         /* Initialize AD with the number of times that the AD timer is called in 1 second
2001                          * can be called only after the mac address of the bond is set
2002                          */
2003                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
2004                 } else {
2005                         SLAVE_AD_INFO(new_slave)->id =
2006                                 SLAVE_AD_INFO(prev_slave)->id + 1;
2007                 }
2008
2009                 bond_3ad_bind_slave(new_slave);
2010                 break;
2011         case BOND_MODE_TLB:
2012         case BOND_MODE_ALB:
2013                 bond_set_active_slave(new_slave);
2014                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
2015                 break;
2016         default:
2017                 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
2018
2019                 /* always active in trunk mode */
2020                 bond_set_active_slave(new_slave);
2021
2022                 /* In trunking mode there is little meaning to curr_active_slave
2023                  * anyway (it holds no special properties of the bond device),
2024                  * so we can change it without calling change_active_interface()
2025                  */
2026                 if (!rcu_access_pointer(bond->curr_active_slave) &&
2027                     new_slave->link == BOND_LINK_UP)
2028                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
2029
2030                 break;
2031         } /* switch(bond_mode) */
2032
2033 #ifdef CONFIG_NET_POLL_CONTROLLER
2034         if (bond->dev->npinfo) {
2035                 if (slave_enable_netpoll(new_slave)) {
2036                         slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
2037                         res = -EBUSY;
2038                         goto err_detach;
2039                 }
2040         }
2041 #endif
2042
2043         if (!(bond_dev->features & NETIF_F_LRO))
2044                 dev_disable_lro(slave_dev);
2045
2046         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
2047                                          new_slave);
2048         if (res) {
2049                 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
2050                 goto err_detach;
2051         }
2052
2053         res = bond_master_upper_dev_link(bond, new_slave, extack);
2054         if (res) {
2055                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
2056                 goto err_unregister;
2057         }
2058
2059         res = bond_sysfs_slave_add(new_slave);
2060         if (res) {
2061                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
2062                 goto err_upper_unlink;
2063         }
2064
2065         /* If the mode uses primary, then the following is handled by
2066          * bond_change_active_slave().
2067          */
2068         if (!bond_uses_primary(bond)) {
2069                 /* set promiscuity level to new slave */
2070                 if (bond_dev->flags & IFF_PROMISC) {
2071                         res = dev_set_promiscuity(slave_dev, 1);
2072                         if (res)
2073                                 goto err_sysfs_del;
2074                 }
2075
2076                 /* set allmulti level to new slave */
2077                 if (bond_dev->flags & IFF_ALLMULTI) {
2078                         res = dev_set_allmulti(slave_dev, 1);
2079                         if (res) {
2080                                 if (bond_dev->flags & IFF_PROMISC)
2081                                         dev_set_promiscuity(slave_dev, -1);
2082                                 goto err_sysfs_del;
2083                         }
2084                 }
2085
2086                 if (bond_dev->flags & IFF_UP) {
2087                         netif_addr_lock_bh(bond_dev);
2088                         dev_mc_sync_multiple(slave_dev, bond_dev);
2089                         dev_uc_sync_multiple(slave_dev, bond_dev);
2090                         netif_addr_unlock_bh(bond_dev);
2091
2092                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2093                                 dev_mc_add(slave_dev, lacpdu_mcast_addr);
2094                 }
2095         }
2096
2097         bond->slave_cnt++;
2098         bond_compute_features(bond);
2099         bond_set_carrier(bond);
2100
2101         if (bond_uses_primary(bond)) {
2102                 block_netpoll_tx();
2103                 bond_select_active_slave(bond);
2104                 unblock_netpoll_tx();
2105         }
2106
2107         if (bond_mode_can_use_xmit_hash(bond))
2108                 bond_update_slave_arr(bond, NULL);
2109
2110
2111         slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
2112                    bond_is_active_slave(new_slave) ? "an active" : "a backup",
2113                    new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
2114
2115         /* enslave is successful */
2116         bond_queue_slave_event(new_slave);
2117         return 0;
2118
2119 /* Undo stages on error */
2120 err_sysfs_del:
2121         bond_sysfs_slave_del(new_slave);
2122
2123 err_upper_unlink:
2124         bond_upper_dev_unlink(bond, new_slave);
2125
2126 err_unregister:
2127         netdev_rx_handler_unregister(slave_dev);
2128
2129 err_detach:
2130         vlan_vids_del_by_dev(slave_dev, bond_dev);
2131         if (rcu_access_pointer(bond->primary_slave) == new_slave)
2132                 RCU_INIT_POINTER(bond->primary_slave, NULL);
2133         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
2134                 block_netpoll_tx();
2135                 bond_change_active_slave(bond, NULL);
2136                 bond_select_active_slave(bond);
2137                 unblock_netpoll_tx();
2138         }
2139         /* either primary_slave or curr_active_slave might've changed */
2140         synchronize_rcu();
2141         slave_disable_netpoll(new_slave);
2142
2143 err_close:
2144         if (!netif_is_bond_master(slave_dev))
2145                 slave_dev->priv_flags &= ~IFF_BONDING;
2146         dev_close(slave_dev);
2147
2148 err_restore_mac:
2149         slave_dev->flags &= ~IFF_SLAVE;
2150         if (!bond->params.fail_over_mac ||
2151             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2152                 /* XXX TODO - fom follow mode needs to change master's
2153                  * MAC if this slave's MAC is in use by the bond, or at
2154                  * least print a warning.
2155                  */
2156                 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2157                                   new_slave->dev->addr_len);
2158                 ss.ss_family = slave_dev->type;
2159                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2160         }
2161
2162 err_restore_mtu:
2163         dev_set_mtu(slave_dev, new_slave->original_mtu);
2164
2165 err_free:
2166         kobject_put(&new_slave->kobj);
2167
2168 err_undo_flags:
2169         /* Enslave of first slave has failed and we need to fix master's mac */
2170         if (!bond_has_slaves(bond)) {
2171                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
2172                                             slave_dev->dev_addr))
2173                         eth_hw_addr_random(bond_dev);
2174                 if (bond_dev->type != ARPHRD_ETHER) {
2175                         dev_close(bond_dev);
2176                         ether_setup(bond_dev);
2177                         bond_dev->flags |= IFF_MASTER;
2178                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2179                 }
2180         }
2181
2182         return res;
2183 }
2184
2185 /* Try to release the slave device <slave> from the bond device <master>
2186  * It is legal to access curr_active_slave without a lock because all the function
2187  * is RTNL-locked. If "all" is true it means that the function is being called
2188  * while destroying a bond interface and all slaves are being released.
2189  *
2190  * The rules for slave state should be:
2191  *   for Active/Backup:
2192  *     Active stays on all backups go down
2193  *   for Bonded connections:
2194  *     The first up interface should be left on and all others downed.
2195  */
2196 static int __bond_release_one(struct net_device *bond_dev,
2197                               struct net_device *slave_dev,
2198                               bool all, bool unregister)
2199 {
2200         struct bonding *bond = netdev_priv(bond_dev);
2201         struct slave *slave, *oldcurrent;
2202         struct sockaddr_storage ss;
2203         int old_flags = bond_dev->flags;
2204         netdev_features_t old_features = bond_dev->features;
2205
2206         /* slave is not a slave or master is not master of this slave */
2207         if (!(slave_dev->flags & IFF_SLAVE) ||
2208             !netdev_has_upper_dev(slave_dev, bond_dev)) {
2209                 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2210                 return -EINVAL;
2211         }
2212
2213         block_netpoll_tx();
2214
2215         slave = bond_get_slave_by_dev(bond, slave_dev);
2216         if (!slave) {
2217                 /* not a slave of this bond */
2218                 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2219                 unblock_netpoll_tx();
2220                 return -EINVAL;
2221         }
2222
2223         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2224
2225         bond_sysfs_slave_del(slave);
2226
2227         /* recompute stats just before removing the slave */
2228         bond_get_stats(bond->dev, &bond->bond_stats);
2229
2230         /* unregister rx_handler early so bond_handle_frame wouldn't be called
2231          * for this slave anymore.
2232          */
2233         netdev_rx_handler_unregister(slave_dev);
2234
2235         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2236                 bond_3ad_unbind_slave(slave);
2237
2238         bond_upper_dev_unlink(bond, slave);
2239
2240         if (bond_mode_can_use_xmit_hash(bond))
2241                 bond_update_slave_arr(bond, slave);
2242
2243         slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2244                     bond_is_active_slave(slave) ? "active" : "backup");
2245
2246         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2247
2248         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2249
2250         if (!all && (!bond->params.fail_over_mac ||
2251                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2252                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2253                     bond_has_slaves(bond))
2254                         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",
2255                                    slave->perm_hwaddr);
2256         }
2257
2258         if (rtnl_dereference(bond->primary_slave) == slave)
2259                 RCU_INIT_POINTER(bond->primary_slave, NULL);
2260
2261         if (oldcurrent == slave)
2262                 bond_change_active_slave(bond, NULL);
2263
2264         if (bond_is_lb(bond)) {
2265                 /* Must be called only after the slave has been
2266                  * detached from the list and the curr_active_slave
2267                  * has been cleared (if our_slave == old_current),
2268                  * but before a new active slave is selected.
2269                  */
2270                 bond_alb_deinit_slave(bond, slave);
2271         }
2272
2273         if (all) {
2274                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2275         } else if (oldcurrent == slave) {
2276                 /* Note that we hold RTNL over this sequence, so there
2277                  * is no concern that another slave add/remove event
2278                  * will interfere.
2279                  */
2280                 bond_select_active_slave(bond);
2281         }
2282
2283         bond_set_carrier(bond);
2284         if (!bond_has_slaves(bond))
2285                 eth_hw_addr_random(bond_dev);
2286
2287         unblock_netpoll_tx();
2288         synchronize_rcu();
2289         bond->slave_cnt--;
2290
2291         if (!bond_has_slaves(bond)) {
2292                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2293                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2294         }
2295
2296         bond_compute_features(bond);
2297         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2298             (old_features & NETIF_F_VLAN_CHALLENGED))
2299                 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2300
2301         vlan_vids_del_by_dev(slave_dev, bond_dev);
2302
2303         /* If the mode uses primary, then this case was handled above by
2304          * bond_change_active_slave(..., NULL)
2305          */
2306         if (!bond_uses_primary(bond)) {
2307                 /* unset promiscuity level from slave
2308                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
2309                  * of the IFF_PROMISC flag in the bond_dev, but we need the
2310                  * value of that flag before that change, as that was the value
2311                  * when this slave was attached, so we cache at the start of the
2312                  * function and use it here. Same goes for ALLMULTI below
2313                  */
2314                 if (old_flags & IFF_PROMISC)
2315                         dev_set_promiscuity(slave_dev, -1);
2316
2317                 /* unset allmulti level from slave */
2318                 if (old_flags & IFF_ALLMULTI)
2319                         dev_set_allmulti(slave_dev, -1);
2320
2321                 if (old_flags & IFF_UP)
2322                         bond_hw_addr_flush(bond_dev, slave_dev);
2323         }
2324
2325         slave_disable_netpoll(slave);
2326
2327         /* close slave before restoring its mac address */
2328         dev_close(slave_dev);
2329
2330         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2331             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2332                 /* restore original ("permanent") mac address */
2333                 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2334                                   slave->dev->addr_len);
2335                 ss.ss_family = slave_dev->type;
2336                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2337         }
2338
2339         if (unregister)
2340                 __dev_set_mtu(slave_dev, slave->original_mtu);
2341         else
2342                 dev_set_mtu(slave_dev, slave->original_mtu);
2343
2344         if (!netif_is_bond_master(slave_dev))
2345                 slave_dev->priv_flags &= ~IFF_BONDING;
2346
2347         kobject_put(&slave->kobj);
2348
2349         return 0;
2350 }
2351
2352 /* A wrapper used because of ndo_del_link */
2353 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2354 {
2355         return __bond_release_one(bond_dev, slave_dev, false, false);
2356 }
2357
2358 /* First release a slave and then destroy the bond if no more slaves are left.
2359  * Must be under rtnl_lock when this function is called.
2360  */
2361 static int bond_release_and_destroy(struct net_device *bond_dev,
2362                                     struct net_device *slave_dev)
2363 {
2364         struct bonding *bond = netdev_priv(bond_dev);
2365         int ret;
2366
2367         ret = __bond_release_one(bond_dev, slave_dev, false, true);
2368         if (ret == 0 && !bond_has_slaves(bond) &&
2369             bond_dev->reg_state != NETREG_UNREGISTERING) {
2370                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2371                 netdev_info(bond_dev, "Destroying bond\n");
2372                 bond_remove_proc_entry(bond);
2373                 unregister_netdevice(bond_dev);
2374         }
2375         return ret;
2376 }
2377
2378 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2379 {
2380         struct bonding *bond = netdev_priv(bond_dev);
2381         bond_fill_ifbond(bond, info);
2382 }
2383
2384 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2385 {
2386         struct bonding *bond = netdev_priv(bond_dev);
2387         struct list_head *iter;
2388         int i = 0, res = -ENODEV;
2389         struct slave *slave;
2390
2391         bond_for_each_slave(bond, slave, iter) {
2392                 if (i++ == (int)info->slave_id) {
2393                         res = 0;
2394                         bond_fill_ifslave(slave, info);
2395                         break;
2396                 }
2397         }
2398
2399         return res;
2400 }
2401
2402 /*-------------------------------- Monitoring -------------------------------*/
2403
2404 /* called with rcu_read_lock() */
2405 static int bond_miimon_inspect(struct bonding *bond)
2406 {
2407         bool ignore_updelay = false;
2408         int link_state, commit = 0;
2409         struct list_head *iter;
2410         struct slave *slave;
2411
2412         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
2413                 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2414         } else {
2415                 struct bond_up_slave *usable_slaves;
2416
2417                 usable_slaves = rcu_dereference(bond->usable_slaves);
2418
2419                 if (usable_slaves && usable_slaves->count == 0)
2420                         ignore_updelay = true;
2421         }
2422
2423         bond_for_each_slave_rcu(bond, slave, iter) {
2424                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2425
2426                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2427
2428                 switch (slave->link) {
2429                 case BOND_LINK_UP:
2430                         if (link_state)
2431                                 continue;
2432
2433                         bond_propose_link_state(slave, BOND_LINK_FAIL);
2434                         commit++;
2435                         slave->delay = bond->params.downdelay;
2436                         if (slave->delay) {
2437                                 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2438                                            (BOND_MODE(bond) ==
2439                                             BOND_MODE_ACTIVEBACKUP) ?
2440                                             (bond_is_active_slave(slave) ?
2441                                              "active " : "backup ") : "",
2442                                            bond->params.downdelay * bond->params.miimon);
2443                         }
2444                         fallthrough;
2445                 case BOND_LINK_FAIL:
2446                         if (link_state) {
2447                                 /* recovered before downdelay expired */
2448                                 bond_propose_link_state(slave, BOND_LINK_UP);
2449                                 slave->last_link_up = jiffies;
2450                                 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2451                                            (bond->params.downdelay - slave->delay) *
2452                                            bond->params.miimon);
2453                                 commit++;
2454                                 continue;
2455                         }
2456
2457                         if (slave->delay <= 0) {
2458                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2459                                 commit++;
2460                                 continue;
2461                         }
2462
2463                         slave->delay--;
2464                         break;
2465
2466                 case BOND_LINK_DOWN:
2467                         if (!link_state)
2468                                 continue;
2469
2470                         bond_propose_link_state(slave, BOND_LINK_BACK);
2471                         commit++;
2472                         slave->delay = bond->params.updelay;
2473
2474                         if (slave->delay) {
2475                                 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2476                                            ignore_updelay ? 0 :
2477                                            bond->params.updelay *
2478                                            bond->params.miimon);
2479                         }
2480                         fallthrough;
2481                 case BOND_LINK_BACK:
2482                         if (!link_state) {
2483                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2484                                 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2485                                            (bond->params.updelay - slave->delay) *
2486                                            bond->params.miimon);
2487                                 commit++;
2488                                 continue;
2489                         }
2490
2491                         if (ignore_updelay)
2492                                 slave->delay = 0;
2493
2494                         if (slave->delay <= 0) {
2495                                 bond_propose_link_state(slave, BOND_LINK_UP);
2496                                 commit++;
2497                                 ignore_updelay = false;
2498                                 continue;
2499                         }
2500
2501                         slave->delay--;
2502                         break;
2503                 }
2504         }
2505
2506         return commit;
2507 }
2508
2509 static void bond_miimon_link_change(struct bonding *bond,
2510                                     struct slave *slave,
2511                                     char link)
2512 {
2513         switch (BOND_MODE(bond)) {
2514         case BOND_MODE_8023AD:
2515                 bond_3ad_handle_link_change(slave, link);
2516                 break;
2517         case BOND_MODE_TLB:
2518         case BOND_MODE_ALB:
2519                 bond_alb_handle_link_change(bond, slave, link);
2520                 break;
2521         case BOND_MODE_XOR:
2522                 bond_update_slave_arr(bond, NULL);
2523                 break;
2524         }
2525 }
2526
2527 static void bond_miimon_commit(struct bonding *bond)
2528 {
2529         struct list_head *iter;
2530         struct slave *slave, *primary;
2531
2532         bond_for_each_slave(bond, slave, iter) {
2533                 switch (slave->link_new_state) {
2534                 case BOND_LINK_NOCHANGE:
2535                         /* For 802.3ad mode, check current slave speed and
2536                          * duplex again in case its port was disabled after
2537                          * invalid speed/duplex reporting but recovered before
2538                          * link monitoring could make a decision on the actual
2539                          * link status
2540                          */
2541                         if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2542                             slave->link == BOND_LINK_UP)
2543                                 bond_3ad_adapter_speed_duplex_changed(slave);
2544                         continue;
2545
2546                 case BOND_LINK_UP:
2547                         if (bond_update_speed_duplex(slave) &&
2548                             bond_needs_speed_duplex(bond)) {
2549                                 slave->link = BOND_LINK_DOWN;
2550                                 if (net_ratelimit())
2551                                         slave_warn(bond->dev, slave->dev,
2552                                                    "failed to get link speed/duplex\n");
2553                                 continue;
2554                         }
2555                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2556                                                   BOND_SLAVE_NOTIFY_NOW);
2557                         slave->last_link_up = jiffies;
2558
2559                         primary = rtnl_dereference(bond->primary_slave);
2560                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2561                                 /* prevent it from being the active one */
2562                                 bond_set_backup_slave(slave);
2563                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2564                                 /* make it immediately active */
2565                                 bond_set_active_slave(slave);
2566                         }
2567
2568                         slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2569                                    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2570                                    slave->duplex ? "full" : "half");
2571
2572                         bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2573
2574                         if (!bond->curr_active_slave || slave == primary)
2575                                 goto do_failover;
2576
2577                         continue;
2578
2579                 case BOND_LINK_DOWN:
2580                         if (slave->link_failure_count < UINT_MAX)
2581                                 slave->link_failure_count++;
2582
2583                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2584                                                   BOND_SLAVE_NOTIFY_NOW);
2585
2586                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2587                             BOND_MODE(bond) == BOND_MODE_8023AD)
2588                                 bond_set_slave_inactive_flags(slave,
2589                                                               BOND_SLAVE_NOTIFY_NOW);
2590
2591                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2592
2593                         bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2594
2595                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2596                                 goto do_failover;
2597
2598                         continue;
2599
2600                 default:
2601                         slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2602                                   slave->link_new_state);
2603                         bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2604
2605                         continue;
2606                 }
2607
2608 do_failover:
2609                 block_netpoll_tx();
2610                 bond_select_active_slave(bond);
2611                 unblock_netpoll_tx();
2612         }
2613
2614         bond_set_carrier(bond);
2615 }
2616
2617 /* bond_mii_monitor
2618  *
2619  * Really a wrapper that splits the mii monitor into two phases: an
2620  * inspection, then (if inspection indicates something needs to be done)
2621  * an acquisition of appropriate locks followed by a commit phase to
2622  * implement whatever link state changes are indicated.
2623  */
2624 static void bond_mii_monitor(struct work_struct *work)
2625 {
2626         struct bonding *bond = container_of(work, struct bonding,
2627                                             mii_work.work);
2628         bool should_notify_peers = false;
2629         bool commit;
2630         unsigned long delay;
2631         struct slave *slave;
2632         struct list_head *iter;
2633
2634         delay = msecs_to_jiffies(bond->params.miimon);
2635
2636         if (!bond_has_slaves(bond))
2637                 goto re_arm;
2638
2639         rcu_read_lock();
2640         should_notify_peers = bond_should_notify_peers(bond);
2641         commit = !!bond_miimon_inspect(bond);
2642         if (bond->send_peer_notif) {
2643                 rcu_read_unlock();
2644                 if (rtnl_trylock()) {
2645                         bond->send_peer_notif--;
2646                         rtnl_unlock();
2647                 }
2648         } else {
2649                 rcu_read_unlock();
2650         }
2651
2652         if (commit) {
2653                 /* Race avoidance with bond_close cancel of workqueue */
2654                 if (!rtnl_trylock()) {
2655                         delay = 1;
2656                         should_notify_peers = false;
2657                         goto re_arm;
2658                 }
2659
2660                 bond_for_each_slave(bond, slave, iter) {
2661                         bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2662                 }
2663                 bond_miimon_commit(bond);
2664
2665                 rtnl_unlock();  /* might sleep, hold no other locks */
2666         }
2667
2668 re_arm:
2669         if (bond->params.miimon)
2670                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2671
2672         if (should_notify_peers) {
2673                 if (!rtnl_trylock())
2674                         return;
2675                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2676                 rtnl_unlock();
2677         }
2678 }
2679
2680 static int bond_upper_dev_walk(struct net_device *upper,
2681                                struct netdev_nested_priv *priv)
2682 {
2683         __be32 ip = *(__be32 *)priv->data;
2684
2685         return ip == bond_confirm_addr(upper, 0, ip);
2686 }
2687
2688 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2689 {
2690         struct netdev_nested_priv priv = {
2691                 .data = (void *)&ip,
2692         };
2693         bool ret = false;
2694
2695         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2696                 return true;
2697
2698         rcu_read_lock();
2699         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
2700                 ret = true;
2701         rcu_read_unlock();
2702
2703         return ret;
2704 }
2705
2706 /* We go to the (large) trouble of VLAN tagging ARP frames because
2707  * switches in VLAN mode (especially if ports are configured as
2708  * "native" to a VLAN) might not pass non-tagged frames.
2709  */
2710 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2711                           __be32 src_ip, struct bond_vlan_tag *tags)
2712 {
2713         struct sk_buff *skb;
2714         struct bond_vlan_tag *outer_tag = tags;
2715         struct net_device *slave_dev = slave->dev;
2716         struct net_device *bond_dev = slave->bond->dev;
2717
2718         slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2719                   arp_op, &dest_ip, &src_ip);
2720
2721         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2722                          NULL, slave_dev->dev_addr, NULL);
2723
2724         if (!skb) {
2725                 net_err_ratelimited("ARP packet allocation failed\n");
2726                 return;
2727         }
2728
2729         if (!tags || tags->vlan_proto == VLAN_N_VID)
2730                 goto xmit;
2731
2732         tags++;
2733
2734         /* Go through all the tags backwards and add them to the packet */
2735         while (tags->vlan_proto != VLAN_N_VID) {
2736                 if (!tags->vlan_id) {
2737                         tags++;
2738                         continue;
2739                 }
2740
2741                 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2742                           ntohs(outer_tag->vlan_proto), tags->vlan_id);
2743                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2744                                                 tags->vlan_id);
2745                 if (!skb) {
2746                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2747                         return;
2748                 }
2749
2750                 tags++;
2751         }
2752         /* Set the outer tag */
2753         if (outer_tag->vlan_id) {
2754                 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2755                           ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2756                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2757                                        outer_tag->vlan_id);
2758         }
2759
2760 xmit:
2761         arp_xmit(skb);
2762 }
2763
2764 /* Validate the device path between the @start_dev and the @end_dev.
2765  * The path is valid if the @end_dev is reachable through device
2766  * stacking.
2767  * When the path is validated, collect any vlan information in the
2768  * path.
2769  */
2770 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2771                                               struct net_device *end_dev,
2772                                               int level)
2773 {
2774         struct bond_vlan_tag *tags;
2775         struct net_device *upper;
2776         struct list_head  *iter;
2777
2778         if (start_dev == end_dev) {
2779                 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2780                 if (!tags)
2781                         return ERR_PTR(-ENOMEM);
2782                 tags[level].vlan_proto = VLAN_N_VID;
2783                 return tags;
2784         }
2785
2786         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2787                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2788                 if (IS_ERR_OR_NULL(tags)) {
2789                         if (IS_ERR(tags))
2790                                 return tags;
2791                         continue;
2792                 }
2793                 if (is_vlan_dev(upper)) {
2794                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2795                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2796                 }
2797
2798                 return tags;
2799         }
2800
2801         return NULL;
2802 }
2803
2804 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2805 {
2806         struct rtable *rt;
2807         struct bond_vlan_tag *tags;
2808         __be32 *targets = bond->params.arp_targets, addr;
2809         int i;
2810
2811         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2812                 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2813                           __func__, &targets[i]);
2814                 tags = NULL;
2815
2816                 /* Find out through which dev should the packet go */
2817                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2818                                      RTO_ONLINK, 0);
2819                 if (IS_ERR(rt)) {
2820                         /* there's no route to target - try to send arp
2821                          * probe to generate any traffic (arp_validate=0)
2822                          */
2823                         if (bond->params.arp_validate)
2824                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2825                                                      bond->dev->name,
2826                                                      &targets[i]);
2827                         bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2828                                       0, tags);
2829                         continue;
2830                 }
2831
2832                 /* bond device itself */
2833                 if (rt->dst.dev == bond->dev)
2834                         goto found;
2835
2836                 rcu_read_lock();
2837                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2838                 rcu_read_unlock();
2839
2840                 if (!IS_ERR_OR_NULL(tags))
2841                         goto found;
2842
2843                 /* Not our device - skip */
2844                 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2845                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2846
2847                 ip_rt_put(rt);
2848                 continue;
2849
2850 found:
2851                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2852                 ip_rt_put(rt);
2853                 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2854                 kfree(tags);
2855         }
2856 }
2857
2858 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2859 {
2860         int i;
2861
2862         if (!sip || !bond_has_this_ip(bond, tip)) {
2863                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2864                            __func__, &sip, &tip);
2865                 return;
2866         }
2867
2868         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2869         if (i == -1) {
2870                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2871                            __func__, &sip);
2872                 return;
2873         }
2874         slave->last_rx = jiffies;
2875         slave->target_last_arp_rx[i] = jiffies;
2876 }
2877
2878 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2879                  struct slave *slave)
2880 {
2881         struct arphdr *arp = (struct arphdr *)skb->data;
2882         struct slave *curr_active_slave, *curr_arp_slave;
2883         unsigned char *arp_ptr;
2884         __be32 sip, tip;
2885         int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2886         unsigned int alen;
2887
2888         if (!slave_do_arp_validate(bond, slave)) {
2889                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2890                     !slave_do_arp_validate_only(bond))
2891                         slave->last_rx = jiffies;
2892                 return RX_HANDLER_ANOTHER;
2893         } else if (!is_arp) {
2894                 return RX_HANDLER_ANOTHER;
2895         }
2896
2897         alen = arp_hdr_len(bond->dev);
2898
2899         slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2900                    __func__, skb->dev->name);
2901
2902         if (alen > skb_headlen(skb)) {
2903                 arp = kmalloc(alen, GFP_ATOMIC);
2904                 if (!arp)
2905                         goto out_unlock;
2906                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2907                         goto out_unlock;
2908         }
2909
2910         if (arp->ar_hln != bond->dev->addr_len ||
2911             skb->pkt_type == PACKET_OTHERHOST ||
2912             skb->pkt_type == PACKET_LOOPBACK ||
2913             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2914             arp->ar_pro != htons(ETH_P_IP) ||
2915             arp->ar_pln != 4)
2916                 goto out_unlock;
2917
2918         arp_ptr = (unsigned char *)(arp + 1);
2919         arp_ptr += bond->dev->addr_len;
2920         memcpy(&sip, arp_ptr, 4);
2921         arp_ptr += 4 + bond->dev->addr_len;
2922         memcpy(&tip, arp_ptr, 4);
2923
2924         slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2925                   __func__, slave->dev->name, bond_slave_state(slave),
2926                   bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2927                   &sip, &tip);
2928
2929         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2930         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2931
2932         /* We 'trust' the received ARP enough to validate it if:
2933          *
2934          * (a) the slave receiving the ARP is active (which includes the
2935          * current ARP slave, if any), or
2936          *
2937          * (b) the receiving slave isn't active, but there is a currently
2938          * active slave and it received valid arp reply(s) after it became
2939          * the currently active slave, or
2940          *
2941          * (c) there is an ARP slave that sent an ARP during the prior ARP
2942          * interval, and we receive an ARP reply on any slave.  We accept
2943          * these because switch FDB update delays may deliver the ARP
2944          * reply to a slave other than the sender of the ARP request.
2945          *
2946          * Note: for (b), backup slaves are receiving the broadcast ARP
2947          * request, not a reply.  This request passes from the sending
2948          * slave through the L2 switch(es) to the receiving slave.  Since
2949          * this is checking the request, sip/tip are swapped for
2950          * validation.
2951          *
2952          * This is done to avoid endless looping when we can't reach the
2953          * arp_ip_target and fool ourselves with our own arp requests.
2954          */
2955         if (bond_is_active_slave(slave))
2956                 bond_validate_arp(bond, slave, sip, tip);
2957         else if (curr_active_slave &&
2958                  time_after(slave_last_rx(bond, curr_active_slave),
2959                             curr_active_slave->last_link_up))
2960                 bond_validate_arp(bond, slave, tip, sip);
2961         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2962                  bond_time_in_interval(bond,
2963                                        dev_trans_start(curr_arp_slave->dev), 1))
2964                 bond_validate_arp(bond, slave, sip, tip);
2965
2966 out_unlock:
2967         if (arp != (struct arphdr *)skb->data)
2968                 kfree(arp);
2969         return RX_HANDLER_ANOTHER;
2970 }
2971
2972 /* function to verify if we're in the arp_interval timeslice, returns true if
2973  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2974  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2975  */
2976 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2977                                   int mod)
2978 {
2979         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2980
2981         return time_in_range(jiffies,
2982                              last_act - delta_in_ticks,
2983                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2984 }
2985
2986 /* This function is called regularly to monitor each slave's link
2987  * ensuring that traffic is being sent and received when arp monitoring
2988  * is used in load-balancing mode. if the adapter has been dormant, then an
2989  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2990  * arp monitoring in active backup mode.
2991  */
2992 static void bond_loadbalance_arp_mon(struct bonding *bond)
2993 {
2994         struct slave *slave, *oldcurrent;
2995         struct list_head *iter;
2996         int do_failover = 0, slave_state_changed = 0;
2997
2998         if (!bond_has_slaves(bond))
2999                 goto re_arm;
3000
3001         rcu_read_lock();
3002
3003         oldcurrent = rcu_dereference(bond->curr_active_slave);
3004         /* see if any of the previous devices are up now (i.e. they have
3005          * xmt and rcv traffic). the curr_active_slave does not come into
3006          * the picture unless it is null. also, slave->last_link_up is not
3007          * needed here because we send an arp on each slave and give a slave
3008          * as long as it needs to get the tx/rx within the delta.
3009          * TODO: what about up/down delay in arp mode? it wasn't here before
3010          *       so it can wait
3011          */
3012         bond_for_each_slave_rcu(bond, slave, iter) {
3013                 unsigned long trans_start = dev_trans_start(slave->dev);
3014
3015                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3016
3017                 if (slave->link != BOND_LINK_UP) {
3018                         if (bond_time_in_interval(bond, trans_start, 1) &&
3019                             bond_time_in_interval(bond, slave->last_rx, 1)) {
3020
3021                                 bond_propose_link_state(slave, BOND_LINK_UP);
3022                                 slave_state_changed = 1;
3023
3024                                 /* primary_slave has no meaning in round-robin
3025                                  * mode. the window of a slave being up and
3026                                  * curr_active_slave being null after enslaving
3027                                  * is closed.
3028                                  */
3029                                 if (!oldcurrent) {
3030                                         slave_info(bond->dev, slave->dev, "link status definitely up\n");
3031                                         do_failover = 1;
3032                                 } else {
3033                                         slave_info(bond->dev, slave->dev, "interface is now up\n");
3034                                 }
3035                         }
3036                 } else {
3037                         /* slave->link == BOND_LINK_UP */
3038
3039                         /* not all switches will respond to an arp request
3040                          * when the source ip is 0, so don't take the link down
3041                          * if we don't know our ip yet
3042                          */
3043                         if (!bond_time_in_interval(bond, trans_start, 2) ||
3044                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
3045
3046                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
3047                                 slave_state_changed = 1;
3048
3049                                 if (slave->link_failure_count < UINT_MAX)
3050                                         slave->link_failure_count++;
3051
3052                                 slave_info(bond->dev, slave->dev, "interface is now down\n");
3053
3054                                 if (slave == oldcurrent)
3055                                         do_failover = 1;
3056                         }
3057                 }
3058
3059                 /* note: if switch is in round-robin mode, all links
3060                  * must tx arp to ensure all links rx an arp - otherwise
3061                  * links may oscillate or not come up at all; if switch is
3062                  * in something like xor mode, there is nothing we can
3063                  * do - all replies will be rx'ed on same link causing slaves
3064                  * to be unstable during low/no traffic periods
3065                  */
3066                 if (bond_slave_is_up(slave))
3067                         bond_arp_send_all(bond, slave);
3068         }
3069
3070         rcu_read_unlock();
3071
3072         if (do_failover || slave_state_changed) {
3073                 if (!rtnl_trylock())
3074                         goto re_arm;
3075
3076                 bond_for_each_slave(bond, slave, iter) {
3077                         if (slave->link_new_state != BOND_LINK_NOCHANGE)
3078                                 slave->link = slave->link_new_state;
3079                 }
3080
3081                 if (slave_state_changed) {
3082                         bond_slave_state_change(bond);
3083                         if (BOND_MODE(bond) == BOND_MODE_XOR)
3084                                 bond_update_slave_arr(bond, NULL);
3085                 }
3086                 if (do_failover) {
3087                         block_netpoll_tx();
3088                         bond_select_active_slave(bond);
3089                         unblock_netpoll_tx();
3090                 }
3091                 rtnl_unlock();
3092         }
3093
3094 re_arm:
3095         if (bond->params.arp_interval)
3096                 queue_delayed_work(bond->wq, &bond->arp_work,
3097                                    msecs_to_jiffies(bond->params.arp_interval));
3098 }
3099
3100 /* Called to inspect slaves for active-backup mode ARP monitor link state
3101  * changes.  Sets proposed link state in slaves to specify what action
3102  * should take place for the slave.  Returns 0 if no changes are found, >0
3103  * if changes to link states must be committed.
3104  *
3105  * Called with rcu_read_lock held.
3106  */
3107 static int bond_ab_arp_inspect(struct bonding *bond)
3108 {
3109         unsigned long trans_start, last_rx;
3110         struct list_head *iter;
3111         struct slave *slave;
3112         int commit = 0;
3113
3114         bond_for_each_slave_rcu(bond, slave, iter) {
3115                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3116                 last_rx = slave_last_rx(bond, slave);
3117
3118                 if (slave->link != BOND_LINK_UP) {
3119                         if (bond_time_in_interval(bond, last_rx, 1)) {
3120                                 bond_propose_link_state(slave, BOND_LINK_UP);
3121                                 commit++;
3122                         } else if (slave->link == BOND_LINK_BACK) {
3123                                 bond_propose_link_state(slave, BOND_LINK_FAIL);
3124                                 commit++;
3125                         }
3126                         continue;
3127                 }
3128
3129                 /* Give slaves 2*delta after being enslaved or made
3130                  * active.  This avoids bouncing, as the last receive
3131                  * times need a full ARP monitor cycle to be updated.
3132                  */
3133                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
3134                         continue;
3135
3136                 /* Backup slave is down if:
3137                  * - No current_arp_slave AND
3138                  * - more than 3*delta since last receive AND
3139                  * - the bond has an IP address
3140                  *
3141                  * Note: a non-null current_arp_slave indicates
3142                  * the curr_active_slave went down and we are
3143                  * searching for a new one; under this condition
3144                  * we only take the curr_active_slave down - this
3145                  * gives each slave a chance to tx/rx traffic
3146                  * before being taken out
3147                  */
3148                 if (!bond_is_active_slave(slave) &&
3149                     !rcu_access_pointer(bond->current_arp_slave) &&
3150                     !bond_time_in_interval(bond, last_rx, 3)) {
3151                         bond_propose_link_state(slave, BOND_LINK_DOWN);
3152                         commit++;
3153                 }
3154
3155                 /* Active slave is down if:
3156                  * - more than 2*delta since transmitting OR
3157                  * - (more than 2*delta since receive AND
3158                  *    the bond has an IP address)
3159                  */
3160                 trans_start = dev_trans_start(slave->dev);
3161                 if (bond_is_active_slave(slave) &&
3162                     (!bond_time_in_interval(bond, trans_start, 2) ||
3163                      !bond_time_in_interval(bond, last_rx, 2))) {
3164                         bond_propose_link_state(slave, BOND_LINK_DOWN);
3165                         commit++;
3166                 }
3167         }
3168
3169         return commit;
3170 }
3171
3172 /* Called to commit link state changes noted by inspection step of
3173  * active-backup mode ARP monitor.
3174  *
3175  * Called with RTNL hold.
3176  */
3177 static void bond_ab_arp_commit(struct bonding *bond)
3178 {
3179         unsigned long trans_start;
3180         struct list_head *iter;
3181         struct slave *slave;
3182
3183         bond_for_each_slave(bond, slave, iter) {
3184                 switch (slave->link_new_state) {
3185                 case BOND_LINK_NOCHANGE:
3186                         continue;
3187
3188                 case BOND_LINK_UP:
3189                         trans_start = dev_trans_start(slave->dev);
3190                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
3191                             (!rtnl_dereference(bond->curr_active_slave) &&
3192                              bond_time_in_interval(bond, trans_start, 1))) {
3193                                 struct slave *current_arp_slave;
3194
3195                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3196                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
3197                                                           BOND_SLAVE_NOTIFY_NOW);
3198                                 if (current_arp_slave) {
3199                                         bond_set_slave_inactive_flags(
3200                                                 current_arp_slave,
3201                                                 BOND_SLAVE_NOTIFY_NOW);
3202                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3203                                 }
3204
3205                                 slave_info(bond->dev, slave->dev, "link status definitely up\n");
3206
3207                                 if (!rtnl_dereference(bond->curr_active_slave) ||
3208                                     slave == rtnl_dereference(bond->primary_slave))
3209                                         goto do_failover;
3210
3211                         }
3212
3213                         continue;
3214
3215                 case BOND_LINK_DOWN:
3216                         if (slave->link_failure_count < UINT_MAX)
3217                                 slave->link_failure_count++;
3218
3219                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3220                                                   BOND_SLAVE_NOTIFY_NOW);
3221                         bond_set_slave_inactive_flags(slave,
3222                                                       BOND_SLAVE_NOTIFY_NOW);
3223
3224                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3225
3226                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
3227                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3228                                 goto do_failover;
3229                         }
3230
3231                         continue;
3232
3233                 case BOND_LINK_FAIL:
3234                         bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3235                                                   BOND_SLAVE_NOTIFY_NOW);
3236                         bond_set_slave_inactive_flags(slave,
3237                                                       BOND_SLAVE_NOTIFY_NOW);
3238
3239                         /* A slave has just been enslaved and has become
3240                          * the current active slave.
3241                          */
3242                         if (rtnl_dereference(bond->curr_active_slave))
3243                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3244                         continue;
3245
3246                 default:
3247                         slave_err(bond->dev, slave->dev,
3248                                   "impossible: link_new_state %d on slave\n",
3249                                   slave->link_new_state);
3250                         continue;
3251                 }
3252
3253 do_failover:
3254                 block_netpoll_tx();
3255                 bond_select_active_slave(bond);
3256                 unblock_netpoll_tx();
3257         }
3258
3259         bond_set_carrier(bond);
3260 }
3261
3262 /* Send ARP probes for active-backup mode ARP monitor.
3263  *
3264  * Called with rcu_read_lock held.
3265  */
3266 static bool bond_ab_arp_probe(struct bonding *bond)
3267 {
3268         struct slave *slave, *before = NULL, *new_slave = NULL,
3269                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3270                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3271         struct list_head *iter;
3272         bool found = false;
3273         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3274
3275         if (curr_arp_slave && curr_active_slave)
3276                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3277                             curr_arp_slave->dev->name,
3278                             curr_active_slave->dev->name);
3279
3280         if (curr_active_slave) {
3281                 bond_arp_send_all(bond, curr_active_slave);
3282                 return should_notify_rtnl;
3283         }
3284
3285         /* if we don't have a curr_active_slave, search for the next available
3286          * backup slave from the current_arp_slave and make it the candidate
3287          * for becoming the curr_active_slave
3288          */
3289
3290         if (!curr_arp_slave) {
3291                 curr_arp_slave = bond_first_slave_rcu(bond);
3292                 if (!curr_arp_slave)
3293                         return should_notify_rtnl;
3294         }
3295
3296         bond_for_each_slave_rcu(bond, slave, iter) {
3297                 if (!found && !before && bond_slave_is_up(slave))
3298                         before = slave;
3299
3300                 if (found && !new_slave && bond_slave_is_up(slave))
3301                         new_slave = slave;
3302                 /* if the link state is up at this point, we
3303                  * mark it down - this can happen if we have
3304                  * simultaneous link failures and
3305                  * reselect_active_interface doesn't make this
3306                  * one the current slave so it is still marked
3307                  * up when it is actually down
3308                  */
3309                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3310                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3311                                                   BOND_SLAVE_NOTIFY_LATER);
3312                         if (slave->link_failure_count < UINT_MAX)
3313                                 slave->link_failure_count++;
3314
3315                         bond_set_slave_inactive_flags(slave,
3316                                                       BOND_SLAVE_NOTIFY_LATER);
3317
3318                         slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3319                 }
3320                 if (slave == curr_arp_slave)
3321                         found = true;
3322         }
3323
3324         if (!new_slave && before)
3325                 new_slave = before;
3326
3327         if (!new_slave)
3328                 goto check_state;
3329
3330         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3331                                   BOND_SLAVE_NOTIFY_LATER);
3332         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3333         bond_arp_send_all(bond, new_slave);
3334         new_slave->last_link_up = jiffies;
3335         rcu_assign_pointer(bond->current_arp_slave, new_slave);
3336
3337 check_state:
3338         bond_for_each_slave_rcu(bond, slave, iter) {
3339                 if (slave->should_notify || slave->should_notify_link) {
3340                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3341                         break;
3342                 }
3343         }
3344         return should_notify_rtnl;
3345 }
3346
3347 static void bond_activebackup_arp_mon(struct bonding *bond)
3348 {
3349         bool should_notify_peers = false;
3350         bool should_notify_rtnl = false;
3351         int delta_in_ticks;
3352
3353         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3354
3355         if (!bond_has_slaves(bond))
3356                 goto re_arm;
3357
3358         rcu_read_lock();
3359
3360         should_notify_peers = bond_should_notify_peers(bond);
3361
3362         if (bond_ab_arp_inspect(bond)) {
3363                 rcu_read_unlock();
3364
3365                 /* Race avoidance with bond_close flush of workqueue */
3366                 if (!rtnl_trylock()) {
3367                         delta_in_ticks = 1;
3368                         should_notify_peers = false;
3369                         goto re_arm;
3370                 }
3371
3372                 bond_ab_arp_commit(bond);
3373
3374                 rtnl_unlock();
3375                 rcu_read_lock();
3376         }
3377
3378         should_notify_rtnl = bond_ab_arp_probe(bond);
3379         rcu_read_unlock();
3380
3381 re_arm:
3382         if (bond->params.arp_interval)
3383                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3384
3385         if (should_notify_peers || should_notify_rtnl) {
3386                 if (!rtnl_trylock())
3387                         return;
3388
3389                 if (should_notify_peers) {
3390                         bond->send_peer_notif--;
3391                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3392                                                  bond->dev);
3393                 }
3394                 if (should_notify_rtnl) {
3395                         bond_slave_state_notify(bond);
3396                         bond_slave_link_notify(bond);
3397                 }
3398
3399                 rtnl_unlock();
3400         }
3401 }
3402
3403 static void bond_arp_monitor(struct work_struct *work)
3404 {
3405         struct bonding *bond = container_of(work, struct bonding,
3406                                             arp_work.work);
3407
3408         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3409                 bond_activebackup_arp_mon(bond);
3410         else
3411                 bond_loadbalance_arp_mon(bond);
3412 }
3413
3414 /*-------------------------- netdev event handling --------------------------*/
3415
3416 /* Change device name */
3417 static int bond_event_changename(struct bonding *bond)
3418 {
3419         bond_remove_proc_entry(bond);
3420         bond_create_proc_entry(bond);
3421
3422         bond_debug_reregister(bond);
3423
3424         return NOTIFY_DONE;
3425 }
3426
3427 static int bond_master_netdev_event(unsigned long event,
3428                                     struct net_device *bond_dev)
3429 {
3430         struct bonding *event_bond = netdev_priv(bond_dev);
3431
3432         netdev_dbg(bond_dev, "%s called\n", __func__);
3433
3434         switch (event) {
3435         case NETDEV_CHANGENAME:
3436                 return bond_event_changename(event_bond);
3437         case NETDEV_UNREGISTER:
3438                 bond_remove_proc_entry(event_bond);
3439 #ifdef CONFIG_XFRM_OFFLOAD
3440                 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true);
3441 #endif /* CONFIG_XFRM_OFFLOAD */
3442                 break;
3443         case NETDEV_REGISTER:
3444                 bond_create_proc_entry(event_bond);
3445                 break;
3446         default:
3447                 break;
3448         }
3449
3450         return NOTIFY_DONE;
3451 }
3452
3453 static int bond_slave_netdev_event(unsigned long event,
3454                                    struct net_device *slave_dev)
3455 {
3456         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3457         struct bonding *bond;
3458         struct net_device *bond_dev;
3459
3460         /* A netdev event can be generated while enslaving a device
3461          * before netdev_rx_handler_register is called in which case
3462          * slave will be NULL
3463          */
3464         if (!slave) {
3465                 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3466                 return NOTIFY_DONE;
3467         }
3468
3469         bond_dev = slave->bond->dev;
3470         bond = slave->bond;
3471         primary = rtnl_dereference(bond->primary_slave);
3472
3473         slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3474
3475         switch (event) {
3476         case NETDEV_UNREGISTER:
3477                 if (bond_dev->type != ARPHRD_ETHER)
3478                         bond_release_and_destroy(bond_dev, slave_dev);
3479                 else
3480                         __bond_release_one(bond_dev, slave_dev, false, true);
3481                 break;
3482         case NETDEV_UP:
3483         case NETDEV_CHANGE:
3484                 /* For 802.3ad mode only:
3485                  * Getting invalid Speed/Duplex values here will put slave
3486                  * in weird state. Mark it as link-fail if the link was
3487                  * previously up or link-down if it hasn't yet come up, and
3488                  * let link-monitoring (miimon) set it right when correct
3489                  * speeds/duplex are available.
3490                  */
3491                 if (bond_update_speed_duplex(slave) &&
3492                     BOND_MODE(bond) == BOND_MODE_8023AD) {
3493                         if (slave->last_link_up)
3494                                 slave->link = BOND_LINK_FAIL;
3495                         else
3496                                 slave->link = BOND_LINK_DOWN;
3497                 }
3498
3499                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3500                         bond_3ad_adapter_speed_duplex_changed(slave);
3501                 fallthrough;
3502         case NETDEV_DOWN:
3503                 /* Refresh slave-array if applicable!
3504                  * If the setup does not use miimon or arpmon (mode-specific!),
3505                  * then these events will not cause the slave-array to be
3506                  * refreshed. This will cause xmit to use a slave that is not
3507                  * usable. Avoid such situation by refeshing the array at these
3508                  * events. If these (miimon/arpmon) parameters are configured
3509                  * then array gets refreshed twice and that should be fine!
3510                  */
3511                 if (bond_mode_can_use_xmit_hash(bond))
3512                         bond_update_slave_arr(bond, NULL);
3513                 break;
3514         case NETDEV_CHANGEMTU:
3515                 /* TODO: Should slaves be allowed to
3516                  * independently alter their MTU?  For
3517                  * an active-backup bond, slaves need
3518                  * not be the same type of device, so
3519                  * MTUs may vary.  For other modes,
3520                  * slaves arguably should have the
3521                  * same MTUs. To do this, we'd need to
3522                  * take over the slave's change_mtu
3523                  * function for the duration of their
3524                  * servitude.
3525                  */
3526                 break;
3527         case NETDEV_CHANGENAME:
3528                 /* we don't care if we don't have primary set */
3529                 if (!bond_uses_primary(bond) ||
3530                     !bond->params.primary[0])
3531                         break;
3532
3533                 if (slave == primary) {
3534                         /* slave's name changed - he's no longer primary */
3535                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3536                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3537                         /* we have a new primary slave */
3538                         rcu_assign_pointer(bond->primary_slave, slave);
3539                 } else { /* we didn't change primary - exit */
3540                         break;
3541                 }
3542
3543                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3544                             primary ? slave_dev->name : "none");
3545
3546                 block_netpoll_tx();
3547                 bond_select_active_slave(bond);
3548                 unblock_netpoll_tx();
3549                 break;
3550         case NETDEV_FEAT_CHANGE:
3551                 if (!bond->notifier_ctx) {
3552                         bond->notifier_ctx = true;
3553                         bond_compute_features(bond);
3554                         bond->notifier_ctx = false;
3555                 }
3556                 break;
3557         case NETDEV_RESEND_IGMP:
3558                 /* Propagate to master device */
3559                 call_netdevice_notifiers(event, slave->bond->dev);
3560                 break;
3561         default:
3562                 break;
3563         }
3564
3565         return NOTIFY_DONE;
3566 }
3567
3568 /* bond_netdev_event: handle netdev notifier chain events.
3569  *
3570  * This function receives events for the netdev chain.  The caller (an
3571  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3572  * locks for us to safely manipulate the slave devices (RTNL lock,
3573  * dev_probe_lock).
3574  */
3575 static int bond_netdev_event(struct notifier_block *this,
3576                              unsigned long event, void *ptr)
3577 {
3578         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3579
3580         netdev_dbg(event_dev, "%s received %s\n",
3581                    __func__, netdev_cmd_to_name(event));
3582
3583         if (!(event_dev->priv_flags & IFF_BONDING))
3584                 return NOTIFY_DONE;
3585
3586         if (event_dev->flags & IFF_MASTER) {
3587                 int ret;
3588
3589                 ret = bond_master_netdev_event(event, event_dev);
3590                 if (ret != NOTIFY_DONE)
3591                         return ret;
3592         }
3593
3594         if (event_dev->flags & IFF_SLAVE)
3595                 return bond_slave_netdev_event(event, event_dev);
3596
3597         return NOTIFY_DONE;
3598 }
3599
3600 static struct notifier_block bond_netdev_notifier = {
3601         .notifier_call = bond_netdev_event,
3602 };
3603
3604 /*---------------------------- Hashing Policies -----------------------------*/
3605
3606 /* L2 hash helper */
3607 static inline u32 bond_eth_hash(struct sk_buff *skb)
3608 {
3609         struct ethhdr *ep, hdr_tmp;
3610
3611         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3612         if (ep)
3613                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3614         return 0;
3615 }
3616
3617 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk,
3618                          int *noff, int *proto, bool l34)
3619 {
3620         const struct ipv6hdr *iph6;
3621         const struct iphdr *iph;
3622
3623         if (skb->protocol == htons(ETH_P_IP)) {
3624                 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph))))
3625                         return false;
3626                 iph = (const struct iphdr *)(skb->data + *noff);
3627                 iph_to_flow_copy_v4addrs(fk, iph);
3628                 *noff += iph->ihl << 2;
3629                 if (!ip_is_fragment(iph))
3630                         *proto = iph->protocol;
3631         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3632                 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph6))))
3633                         return false;
3634                 iph6 = (const struct ipv6hdr *)(skb->data + *noff);
3635                 iph_to_flow_copy_v6addrs(fk, iph6);
3636                 *noff += sizeof(*iph6);
3637                 *proto = iph6->nexthdr;
3638         } else {
3639                 return false;
3640         }
3641
3642         if (l34 && *proto >= 0)
3643                 fk->ports.ports = skb_flow_get_ports(skb, *noff, *proto);
3644
3645         return true;
3646 }
3647
3648 /* Extract the appropriate headers based on bond's xmit policy */
3649 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3650                               struct flow_keys *fk)
3651 {
3652         bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
3653         int noff, proto = -1;
3654
3655         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) {
3656                 memset(fk, 0, sizeof(*fk));
3657                 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
3658                                           fk, NULL, 0, 0, 0, 0);
3659         }
3660
3661         fk->ports.ports = 0;
3662         memset(&fk->icmp, 0, sizeof(fk->icmp));
3663         noff = skb_network_offset(skb);
3664         if (!bond_flow_ip(skb, fk, &noff, &proto, l34))
3665                 return false;
3666
3667         /* ICMP error packets contains at least 8 bytes of the header
3668          * of the packet which generated the error. Use this information
3669          * to correlate ICMP error packets within the same flow which
3670          * generated the error.
3671          */
3672         if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) {
3673                 skb_flow_get_icmp_tci(skb, &fk->icmp, skb->data,
3674                                       skb_transport_offset(skb),
3675                                       skb_headlen(skb));
3676                 if (proto == IPPROTO_ICMP) {
3677                         if (!icmp_is_err(fk->icmp.type))
3678                                 return true;
3679
3680                         noff += sizeof(struct icmphdr);
3681                 } else if (proto == IPPROTO_ICMPV6) {
3682                         if (!icmpv6_is_err(fk->icmp.type))
3683                                 return true;
3684
3685                         noff += sizeof(struct icmp6hdr);
3686                 }
3687                 return bond_flow_ip(skb, fk, &noff, &proto, l34);
3688         }
3689
3690         return true;
3691 }
3692
3693 /**
3694  * bond_xmit_hash - generate a hash value based on the xmit policy
3695  * @bond: bonding device
3696  * @skb: buffer to use for headers
3697  *
3698  * This function will extract the necessary headers from the skb buffer and use
3699  * them to generate a hash based on the xmit_policy set in the bonding device
3700  */
3701 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3702 {
3703         struct flow_keys flow;
3704         u32 hash;
3705
3706         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3707             skb->l4_hash)
3708                 return skb->hash;
3709
3710         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3711             !bond_flow_dissect(bond, skb, &flow))
3712                 return bond_eth_hash(skb);
3713
3714         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3715             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
3716                 hash = bond_eth_hash(skb);
3717         } else {
3718                 if (flow.icmp.id)
3719                         memcpy(&hash, &flow.icmp, sizeof(hash));
3720                 else
3721                         memcpy(&hash, &flow.ports.ports, sizeof(hash));
3722         }
3723         hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3724                 (__force u32)flow_get_u32_src(&flow);
3725         hash ^= (hash >> 16);
3726         hash ^= (hash >> 8);
3727
3728         return hash >> 1;
3729 }
3730
3731 /*-------------------------- Device entry points ----------------------------*/
3732
3733 void bond_work_init_all(struct bonding *bond)
3734 {
3735         INIT_DELAYED_WORK(&bond->mcast_work,
3736                           bond_resend_igmp_join_requests_delayed);
3737         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3738         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3739         INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3740         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3741         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3742 }
3743
3744 static void bond_work_cancel_all(struct bonding *bond)
3745 {
3746         cancel_delayed_work_sync(&bond->mii_work);
3747         cancel_delayed_work_sync(&bond->arp_work);
3748         cancel_delayed_work_sync(&bond->alb_work);
3749         cancel_delayed_work_sync(&bond->ad_work);
3750         cancel_delayed_work_sync(&bond->mcast_work);
3751         cancel_delayed_work_sync(&bond->slave_arr_work);
3752 }
3753
3754 static int bond_open(struct net_device *bond_dev)
3755 {
3756         struct bonding *bond = netdev_priv(bond_dev);
3757         struct list_head *iter;
3758         struct slave *slave;
3759
3760         /* reset slave->backup and slave->inactive */
3761         if (bond_has_slaves(bond)) {
3762                 bond_for_each_slave(bond, slave, iter) {
3763                         if (bond_uses_primary(bond) &&
3764                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3765                                 bond_set_slave_inactive_flags(slave,
3766                                                               BOND_SLAVE_NOTIFY_NOW);
3767                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3768                                 bond_set_slave_active_flags(slave,
3769                                                             BOND_SLAVE_NOTIFY_NOW);
3770                         }
3771                 }
3772         }
3773
3774         if (bond_is_lb(bond)) {
3775                 /* bond_alb_initialize must be called before the timer
3776                  * is started.
3777                  */
3778                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3779                         return -ENOMEM;
3780                 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3781                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3782         }
3783
3784         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3785                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3786
3787         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3788                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3789                 bond->recv_probe = bond_arp_rcv;
3790         }
3791
3792         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3793                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3794                 /* register to receive LACPDUs */
3795                 bond->recv_probe = bond_3ad_lacpdu_recv;
3796                 bond_3ad_initiate_agg_selection(bond, 1);
3797
3798                 bond_for_each_slave(bond, slave, iter)
3799                         dev_mc_add(slave->dev, lacpdu_mcast_addr);
3800         }
3801
3802         if (bond_mode_can_use_xmit_hash(bond))
3803                 bond_update_slave_arr(bond, NULL);
3804
3805         return 0;
3806 }
3807
3808 static int bond_close(struct net_device *bond_dev)
3809 {
3810         struct bonding *bond = netdev_priv(bond_dev);
3811         struct slave *slave;
3812
3813         bond_work_cancel_all(bond);
3814         bond->send_peer_notif = 0;
3815         if (bond_is_lb(bond))
3816                 bond_alb_deinitialize(bond);
3817         bond->recv_probe = NULL;
3818
3819         if (bond_uses_primary(bond)) {
3820                 rcu_read_lock();
3821                 slave = rcu_dereference(bond->curr_active_slave);
3822                 if (slave)
3823                         bond_hw_addr_flush(bond_dev, slave->dev);
3824                 rcu_read_unlock();
3825         } else {
3826                 struct list_head *iter;
3827
3828                 bond_for_each_slave(bond, slave, iter)
3829                         bond_hw_addr_flush(bond_dev, slave->dev);
3830         }
3831
3832         return 0;
3833 }
3834
3835 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3836  * that some drivers can provide 32bit values only.
3837  */
3838 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3839                             const struct rtnl_link_stats64 *_new,
3840                             const struct rtnl_link_stats64 *_old)
3841 {
3842         const u64 *new = (const u64 *)_new;
3843         const u64 *old = (const u64 *)_old;
3844         u64 *res = (u64 *)_res;
3845         int i;
3846
3847         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3848                 u64 nv = new[i];
3849                 u64 ov = old[i];
3850                 s64 delta = nv - ov;
3851
3852                 /* detects if this particular field is 32bit only */
3853                 if (((nv | ov) >> 32) == 0)
3854                         delta = (s64)(s32)((u32)nv - (u32)ov);
3855
3856                 /* filter anomalies, some drivers reset their stats
3857                  * at down/up events.
3858                  */
3859                 if (delta > 0)
3860                         res[i] += delta;
3861         }
3862 }
3863
3864 #ifdef CONFIG_LOCKDEP
3865 static int bond_get_lowest_level_rcu(struct net_device *dev)
3866 {
3867         struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
3868         struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
3869         int cur = 0, max = 0;
3870
3871         now = dev;
3872         iter = &dev->adj_list.lower;
3873
3874         while (1) {
3875                 next = NULL;
3876                 while (1) {
3877                         ldev = netdev_next_lower_dev_rcu(now, &iter);
3878                         if (!ldev)
3879                                 break;
3880
3881                         next = ldev;
3882                         niter = &ldev->adj_list.lower;
3883                         dev_stack[cur] = now;
3884                         iter_stack[cur++] = iter;
3885                         if (max <= cur)
3886                                 max = cur;
3887                         break;
3888                 }
3889
3890                 if (!next) {
3891                         if (!cur)
3892                                 return max;
3893                         next = dev_stack[--cur];
3894                         niter = iter_stack[cur];
3895                 }
3896
3897                 now = next;
3898                 iter = niter;
3899         }
3900
3901         return max;
3902 }
3903 #endif
3904
3905 static void bond_get_stats(struct net_device *bond_dev,
3906                            struct rtnl_link_stats64 *stats)
3907 {
3908         struct bonding *bond = netdev_priv(bond_dev);
3909         struct rtnl_link_stats64 temp;
3910         struct list_head *iter;
3911         struct slave *slave;
3912         int nest_level = 0;
3913
3914
3915         rcu_read_lock();
3916 #ifdef CONFIG_LOCKDEP
3917         nest_level = bond_get_lowest_level_rcu(bond_dev);
3918 #endif
3919
3920         spin_lock_nested(&bond->stats_lock, nest_level);
3921         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3922
3923         bond_for_each_slave_rcu(bond, slave, iter) {
3924                 const struct rtnl_link_stats64 *new =
3925                         dev_get_stats(slave->dev, &temp);
3926
3927                 bond_fold_stats(stats, new, &slave->slave_stats);
3928
3929                 /* save off the slave stats for the next run */
3930                 memcpy(&slave->slave_stats, new, sizeof(*new));
3931         }
3932
3933         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3934         spin_unlock(&bond->stats_lock);
3935         rcu_read_unlock();
3936 }
3937
3938 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3939 {
3940         struct bonding *bond = netdev_priv(bond_dev);
3941         struct net_device *slave_dev = NULL;
3942         struct ifbond k_binfo;
3943         struct ifbond __user *u_binfo = NULL;
3944         struct ifslave k_sinfo;
3945         struct ifslave __user *u_sinfo = NULL;
3946         struct mii_ioctl_data *mii = NULL;
3947         struct bond_opt_value newval;
3948         struct net *net;
3949         int res = 0;
3950
3951         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3952
3953         switch (cmd) {
3954         case SIOCGMIIPHY:
3955                 mii = if_mii(ifr);
3956                 if (!mii)
3957                         return -EINVAL;
3958
3959                 mii->phy_id = 0;
3960                 fallthrough;
3961         case SIOCGMIIREG:
3962                 /* We do this again just in case we were called by SIOCGMIIREG
3963                  * instead of SIOCGMIIPHY.
3964                  */
3965                 mii = if_mii(ifr);
3966                 if (!mii)
3967                         return -EINVAL;
3968
3969                 if (mii->reg_num == 1) {
3970                         mii->val_out = 0;
3971                         if (netif_carrier_ok(bond->dev))
3972                                 mii->val_out = BMSR_LSTATUS;
3973                 }
3974
3975                 return 0;
3976         case BOND_INFO_QUERY_OLD:
3977         case SIOCBONDINFOQUERY:
3978                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3979
3980                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3981                         return -EFAULT;
3982
3983                 bond_info_query(bond_dev, &k_binfo);
3984                 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3985                         return -EFAULT;
3986
3987                 return 0;
3988         case BOND_SLAVE_INFO_QUERY_OLD:
3989         case SIOCBONDSLAVEINFOQUERY:
3990                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3991
3992                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3993                         return -EFAULT;
3994
3995                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3996                 if (res == 0 &&
3997                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3998                         return -EFAULT;
3999
4000                 return res;
4001         default:
4002                 break;
4003         }
4004
4005         net = dev_net(bond_dev);
4006
4007         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4008                 return -EPERM;
4009
4010         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
4011
4012         slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
4013
4014         if (!slave_dev)
4015                 return -ENODEV;
4016
4017         switch (cmd) {
4018         case BOND_ENSLAVE_OLD:
4019         case SIOCBONDENSLAVE:
4020                 res = bond_enslave(bond_dev, slave_dev, NULL);
4021                 break;
4022         case BOND_RELEASE_OLD:
4023         case SIOCBONDRELEASE:
4024                 res = bond_release(bond_dev, slave_dev);
4025                 break;
4026         case BOND_SETHWADDR_OLD:
4027         case SIOCBONDSETHWADDR:
4028                 res = bond_set_dev_addr(bond_dev, slave_dev);
4029                 break;
4030         case BOND_CHANGE_ACTIVE_OLD:
4031         case SIOCBONDCHANGEACTIVE:
4032                 bond_opt_initstr(&newval, slave_dev->name);
4033                 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
4034                                             &newval);
4035                 break;
4036         default:
4037                 res = -EOPNOTSUPP;
4038         }
4039
4040         return res;
4041 }
4042
4043 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
4044 {
4045         struct bonding *bond = netdev_priv(bond_dev);
4046
4047         if (change & IFF_PROMISC)
4048                 bond_set_promiscuity(bond,
4049                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
4050
4051         if (change & IFF_ALLMULTI)
4052                 bond_set_allmulti(bond,
4053                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
4054 }
4055
4056 static void bond_set_rx_mode(struct net_device *bond_dev)
4057 {
4058         struct bonding *bond = netdev_priv(bond_dev);
4059         struct list_head *iter;
4060         struct slave *slave;
4061
4062         rcu_read_lock();
4063         if (bond_uses_primary(bond)) {
4064                 slave = rcu_dereference(bond->curr_active_slave);
4065                 if (slave) {
4066                         dev_uc_sync(slave->dev, bond_dev);
4067                         dev_mc_sync(slave->dev, bond_dev);
4068                 }
4069         } else {
4070                 bond_for_each_slave_rcu(bond, slave, iter) {
4071                         dev_uc_sync_multiple(slave->dev, bond_dev);
4072                         dev_mc_sync_multiple(slave->dev, bond_dev);
4073                 }
4074         }
4075         rcu_read_unlock();
4076 }
4077
4078 static int bond_neigh_init(struct neighbour *n)
4079 {
4080         struct bonding *bond = netdev_priv(n->dev);
4081         const struct net_device_ops *slave_ops;
4082         struct neigh_parms parms;
4083         struct slave *slave;
4084         int ret = 0;
4085
4086         rcu_read_lock();
4087         slave = bond_first_slave_rcu(bond);
4088         if (!slave)
4089                 goto out;
4090         slave_ops = slave->dev->netdev_ops;
4091         if (!slave_ops->ndo_neigh_setup)
4092                 goto out;
4093
4094         /* TODO: find another way [1] to implement this.
4095          * Passing a zeroed structure is fragile,
4096          * but at least we do not pass garbage.
4097          *
4098          * [1] One way would be that ndo_neigh_setup() never touch
4099          *     struct neigh_parms, but propagate the new neigh_setup()
4100          *     back to ___neigh_create() / neigh_parms_alloc()
4101          */
4102         memset(&parms, 0, sizeof(parms));
4103         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
4104
4105         if (ret)
4106                 goto out;
4107
4108         if (parms.neigh_setup)
4109                 ret = parms.neigh_setup(n);
4110 out:
4111         rcu_read_unlock();
4112         return ret;
4113 }
4114
4115 /* The bonding ndo_neigh_setup is called at init time beofre any
4116  * slave exists. So we must declare proxy setup function which will
4117  * be used at run time to resolve the actual slave neigh param setup.
4118  *
4119  * It's also called by master devices (such as vlans) to setup their
4120  * underlying devices. In that case - do nothing, we're already set up from
4121  * our init.
4122  */
4123 static int bond_neigh_setup(struct net_device *dev,
4124                             struct neigh_parms *parms)
4125 {
4126         /* modify only our neigh_parms */
4127         if (parms->dev == dev)
4128                 parms->neigh_setup = bond_neigh_init;
4129
4130         return 0;
4131 }
4132
4133 /* Change the MTU of all of a master's slaves to match the master */
4134 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4135 {
4136         struct bonding *bond = netdev_priv(bond_dev);
4137         struct slave *slave, *rollback_slave;
4138         struct list_head *iter;
4139         int res = 0;
4140
4141         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
4142
4143         bond_for_each_slave(bond, slave, iter) {
4144                 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
4145                            slave, slave->dev->netdev_ops->ndo_change_mtu);
4146
4147                 res = dev_set_mtu(slave->dev, new_mtu);
4148
4149                 if (res) {
4150                         /* If we failed to set the slave's mtu to the new value
4151                          * we must abort the operation even in ACTIVE_BACKUP
4152                          * mode, because if we allow the backup slaves to have
4153                          * different mtu values than the active slave we'll
4154                          * need to change their mtu when doing a failover. That
4155                          * means changing their mtu from timer context, which
4156                          * is probably not a good idea.
4157                          */
4158                         slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
4159                                   res, new_mtu);
4160                         goto unwind;
4161                 }
4162         }
4163
4164         bond_dev->mtu = new_mtu;
4165
4166         return 0;
4167
4168 unwind:
4169         /* unwind from head to the slave that failed */
4170         bond_for_each_slave(bond, rollback_slave, iter) {
4171                 int tmp_res;
4172
4173                 if (rollback_slave == slave)
4174                         break;
4175
4176                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
4177                 if (tmp_res)
4178                         slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
4179                                   tmp_res);
4180         }
4181
4182         return res;
4183 }
4184
4185 /* Change HW address
4186  *
4187  * Note that many devices must be down to change the HW address, and
4188  * downing the master releases all slaves.  We can make bonds full of
4189  * bonding devices to test this, however.
4190  */
4191 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4192 {
4193         struct bonding *bond = netdev_priv(bond_dev);
4194         struct slave *slave, *rollback_slave;
4195         struct sockaddr_storage *ss = addr, tmp_ss;
4196         struct list_head *iter;
4197         int res = 0;
4198
4199         if (BOND_MODE(bond) == BOND_MODE_ALB)
4200                 return bond_alb_set_mac_address(bond_dev, addr);
4201
4202
4203         netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4204
4205         /* If fail_over_mac is enabled, do nothing and return success.
4206          * Returning an error causes ifenslave to fail.
4207          */
4208         if (bond->params.fail_over_mac &&
4209             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4210                 return 0;
4211
4212         if (!is_valid_ether_addr(ss->__data))
4213                 return -EADDRNOTAVAIL;
4214
4215         bond_for_each_slave(bond, slave, iter) {
4216                 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4217                           __func__, slave);
4218                 res = dev_set_mac_address(slave->dev, addr, NULL);
4219                 if (res) {
4220                         /* TODO: consider downing the slave
4221                          * and retry ?
4222                          * User should expect communications
4223                          * breakage anyway until ARP finish
4224                          * updating, so...
4225                          */
4226                         slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4227                                   __func__, res);
4228                         goto unwind;
4229                 }
4230         }
4231
4232         /* success */
4233         memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
4234         return 0;
4235
4236 unwind:
4237         memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4238         tmp_ss.ss_family = bond_dev->type;
4239
4240         /* unwind from head to the slave that failed */
4241         bond_for_each_slave(bond, rollback_slave, iter) {
4242                 int tmp_res;
4243
4244                 if (rollback_slave == slave)
4245                         break;
4246
4247                 tmp_res = dev_set_mac_address(rollback_slave->dev,
4248                                               (struct sockaddr *)&tmp_ss, NULL);
4249                 if (tmp_res) {
4250                         slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4251                                    __func__, tmp_res);
4252                 }
4253         }
4254
4255         return res;
4256 }
4257
4258 /**
4259  * bond_get_slave_by_id - get xmit slave with slave_id
4260  * @bond: bonding device that is transmitting
4261  * @slave_id: slave id up to slave_cnt-1 through which to transmit
4262  *
4263  * This function tries to get slave with slave_id but in case
4264  * it fails, it tries to find the first available slave for transmission.
4265  */
4266 static struct slave *bond_get_slave_by_id(struct bonding *bond,
4267                                           int slave_id)
4268 {
4269         struct list_head *iter;
4270         struct slave *slave;
4271         int i = slave_id;
4272
4273         /* Here we start from the slave with slave_id */
4274         bond_for_each_slave_rcu(bond, slave, iter) {
4275                 if (--i < 0) {
4276                         if (bond_slave_can_tx(slave))
4277                                 return slave;
4278                 }
4279         }
4280
4281         /* Here we start from the first slave up to slave_id */
4282         i = slave_id;
4283         bond_for_each_slave_rcu(bond, slave, iter) {
4284                 if (--i < 0)
4285                         break;
4286                 if (bond_slave_can_tx(slave))
4287                         return slave;
4288         }
4289         /* no slave that can tx has been found */
4290         return NULL;
4291 }
4292
4293 /**
4294  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4295  * @bond: bonding device to use
4296  *
4297  * Based on the value of the bonding device's packets_per_slave parameter
4298  * this function generates a slave id, which is usually used as the next
4299  * slave to transmit through.
4300  */
4301 static u32 bond_rr_gen_slave_id(struct bonding *bond)
4302 {
4303         u32 slave_id;
4304         struct reciprocal_value reciprocal_packets_per_slave;
4305         int packets_per_slave = bond->params.packets_per_slave;
4306
4307         switch (packets_per_slave) {
4308         case 0:
4309                 slave_id = prandom_u32();
4310                 break;
4311         case 1:
4312                 slave_id = bond->rr_tx_counter;
4313                 break;
4314         default:
4315                 reciprocal_packets_per_slave =
4316                         bond->params.reciprocal_packets_per_slave;
4317                 slave_id = reciprocal_divide(bond->rr_tx_counter,
4318                                              reciprocal_packets_per_slave);
4319                 break;
4320         }
4321         bond->rr_tx_counter++;
4322
4323         return slave_id;
4324 }
4325
4326 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4327                                                     struct sk_buff *skb)
4328 {
4329         struct slave *slave;
4330         int slave_cnt;
4331         u32 slave_id;
4332
4333         /* Start with the curr_active_slave that joined the bond as the
4334          * default for sending IGMP traffic.  For failover purposes one
4335          * needs to maintain some consistency for the interface that will
4336          * send the join/membership reports.  The curr_active_slave found
4337          * will send all of this type of traffic.
4338          */
4339         if (skb->protocol == htons(ETH_P_IP)) {
4340                 int noff = skb_network_offset(skb);
4341                 struct iphdr *iph;
4342
4343                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4344                         goto non_igmp;
4345
4346                 iph = ip_hdr(skb);
4347                 if (iph->protocol == IPPROTO_IGMP) {
4348                         slave = rcu_dereference(bond->curr_active_slave);
4349                         if (slave)
4350                                 return slave;
4351                         return bond_get_slave_by_id(bond, 0);
4352                 }
4353         }
4354
4355 non_igmp:
4356         slave_cnt = READ_ONCE(bond->slave_cnt);
4357         if (likely(slave_cnt)) {
4358                 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4359                 return bond_get_slave_by_id(bond, slave_id);
4360         }
4361         return NULL;
4362 }
4363
4364 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4365                                         struct net_device *bond_dev)
4366 {
4367         struct bonding *bond = netdev_priv(bond_dev);
4368         struct slave *slave;
4369
4370         slave = bond_xmit_roundrobin_slave_get(bond, skb);
4371         if (likely(slave))
4372                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4373
4374         return bond_tx_drop(bond_dev, skb);
4375 }
4376
4377 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond,
4378                                                       struct sk_buff *skb)
4379 {
4380         return rcu_dereference(bond->curr_active_slave);
4381 }
4382
4383 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
4384  * the bond has a usable interface.
4385  */
4386 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4387                                           struct net_device *bond_dev)
4388 {
4389         struct bonding *bond = netdev_priv(bond_dev);
4390         struct slave *slave;
4391
4392         slave = bond_xmit_activebackup_slave_get(bond, skb);
4393         if (slave)
4394                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4395
4396         return bond_tx_drop(bond_dev, skb);
4397 }
4398
4399 /* Use this to update slave_array when (a) it's not appropriate to update
4400  * slave_array right away (note that update_slave_array() may sleep)
4401  * and / or (b) RTNL is not held.
4402  */
4403 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4404 {
4405         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4406 }
4407
4408 /* Slave array work handler. Holds only RTNL */
4409 static void bond_slave_arr_handler(struct work_struct *work)
4410 {
4411         struct bonding *bond = container_of(work, struct bonding,
4412                                             slave_arr_work.work);
4413         int ret;
4414
4415         if (!rtnl_trylock())
4416                 goto err;
4417
4418         ret = bond_update_slave_arr(bond, NULL);
4419         rtnl_unlock();
4420         if (ret) {
4421                 pr_warn_ratelimited("Failed to update slave array from WT\n");
4422                 goto err;
4423         }
4424         return;
4425
4426 err:
4427         bond_slave_arr_work_rearm(bond, 1);
4428 }
4429
4430 static void bond_skip_slave(struct bond_up_slave *slaves,
4431                             struct slave *skipslave)
4432 {
4433         int idx;
4434
4435         /* Rare situation where caller has asked to skip a specific
4436          * slave but allocation failed (most likely!). BTW this is
4437          * only possible when the call is initiated from
4438          * __bond_release_one(). In this situation; overwrite the
4439          * skipslave entry in the array with the last entry from the
4440          * array to avoid a situation where the xmit path may choose
4441          * this to-be-skipped slave to send a packet out.
4442          */
4443         for (idx = 0; slaves && idx < slaves->count; idx++) {
4444                 if (skipslave == slaves->arr[idx]) {
4445                         slaves->arr[idx] =
4446                                 slaves->arr[slaves->count - 1];
4447                         slaves->count--;
4448                         break;
4449                 }
4450         }
4451 }
4452
4453 static void bond_set_slave_arr(struct bonding *bond,
4454                                struct bond_up_slave *usable_slaves,
4455                                struct bond_up_slave *all_slaves)
4456 {
4457         struct bond_up_slave *usable, *all;
4458
4459         usable = rtnl_dereference(bond->usable_slaves);
4460         rcu_assign_pointer(bond->usable_slaves, usable_slaves);
4461         kfree_rcu(usable, rcu);
4462
4463         all = rtnl_dereference(bond->all_slaves);
4464         rcu_assign_pointer(bond->all_slaves, all_slaves);
4465         kfree_rcu(all, rcu);
4466 }
4467
4468 static void bond_reset_slave_arr(struct bonding *bond)
4469 {
4470         struct bond_up_slave *usable, *all;
4471
4472         usable = rtnl_dereference(bond->usable_slaves);
4473         if (usable) {
4474                 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4475                 kfree_rcu(usable, rcu);
4476         }
4477
4478         all = rtnl_dereference(bond->all_slaves);
4479         if (all) {
4480                 RCU_INIT_POINTER(bond->all_slaves, NULL);
4481                 kfree_rcu(all, rcu);
4482         }
4483 }
4484
4485 /* Build the usable slaves array in control path for modes that use xmit-hash
4486  * to determine the slave interface -
4487  * (a) BOND_MODE_8023AD
4488  * (b) BOND_MODE_XOR
4489  * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
4490  *
4491  * The caller is expected to hold RTNL only and NO other lock!
4492  */
4493 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
4494 {
4495         struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
4496         struct slave *slave;
4497         struct list_head *iter;
4498         int agg_id = 0;
4499         int ret = 0;
4500
4501 #ifdef CONFIG_LOCKDEP
4502         WARN_ON(lockdep_is_held(&bond->mode_lock));
4503 #endif
4504
4505         usable_slaves = kzalloc(struct_size(usable_slaves, arr,
4506                                             bond->slave_cnt), GFP_KERNEL);
4507         all_slaves = kzalloc(struct_size(all_slaves, arr,
4508                                          bond->slave_cnt), GFP_KERNEL);
4509         if (!usable_slaves || !all_slaves) {
4510                 ret = -ENOMEM;
4511                 goto out;
4512         }
4513         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4514                 struct ad_info ad_info;
4515
4516                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
4517                         pr_debug("bond_3ad_get_active_agg_info failed\n");
4518                         /* No active aggragator means it's not safe to use
4519                          * the previous array.
4520                          */
4521                         bond_reset_slave_arr(bond);
4522                         goto out;
4523                 }
4524                 agg_id = ad_info.aggregator_id;
4525         }
4526         bond_for_each_slave(bond, slave, iter) {
4527                 if (skipslave == slave)
4528                         continue;
4529
4530                 all_slaves->arr[all_slaves->count++] = slave;
4531                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4532                         struct aggregator *agg;
4533
4534                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
4535                         if (!agg || agg->aggregator_identifier != agg_id)
4536                                 continue;
4537                 }
4538                 if (!bond_slave_can_tx(slave))
4539                         continue;
4540
4541                 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4542                           usable_slaves->count);
4543
4544                 usable_slaves->arr[usable_slaves->count++] = slave;
4545         }
4546
4547         bond_set_slave_arr(bond, usable_slaves, all_slaves);
4548         return ret;
4549 out:
4550         if (ret != 0 && skipslave) {
4551                 bond_skip_slave(rtnl_dereference(bond->all_slaves),
4552                                 skipslave);
4553                 bond_skip_slave(rtnl_dereference(bond->usable_slaves),
4554                                 skipslave);
4555         }
4556         kfree_rcu(all_slaves, rcu);
4557         kfree_rcu(usable_slaves, rcu);
4558
4559         return ret;
4560 }
4561
4562 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
4563                                                  struct sk_buff *skb,
4564                                                  struct bond_up_slave *slaves)
4565 {
4566         struct slave *slave;
4567         unsigned int count;
4568         u32 hash;
4569
4570         hash = bond_xmit_hash(bond, skb);
4571         count = slaves ? READ_ONCE(slaves->count) : 0;
4572         if (unlikely(!count))
4573                 return NULL;
4574
4575         slave = slaves->arr[hash % count];
4576         return slave;
4577 }
4578
4579 /* Use this Xmit function for 3AD as well as XOR modes. The current
4580  * usable slave array is formed in the control path. The xmit function
4581  * just calculates hash and sends the packet out.
4582  */
4583 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4584                                      struct net_device *dev)
4585 {
4586         struct bonding *bond = netdev_priv(dev);
4587         struct bond_up_slave *slaves;
4588         struct slave *slave;
4589
4590         slaves = rcu_dereference(bond->usable_slaves);
4591         slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4592         if (likely(slave))
4593                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4594
4595         return bond_tx_drop(dev, skb);
4596 }
4597
4598 /* in broadcast mode, we send everything to all usable interfaces. */
4599 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4600                                        struct net_device *bond_dev)
4601 {
4602         struct bonding *bond = netdev_priv(bond_dev);
4603         struct slave *slave = NULL;
4604         struct list_head *iter;
4605         bool xmit_suc = false;
4606         bool skb_used = false;
4607
4608         bond_for_each_slave_rcu(bond, slave, iter) {
4609                 struct sk_buff *skb2;
4610
4611                 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP))
4612                         continue;
4613
4614                 if (bond_is_last_slave(bond, slave)) {
4615                         skb2 = skb;
4616                         skb_used = true;
4617                 } else {
4618                         skb2 = skb_clone(skb, GFP_ATOMIC);
4619                         if (!skb2) {
4620                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4621                                                     bond_dev->name, __func__);
4622                                 continue;
4623                         }
4624                 }
4625
4626                 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK)
4627                         xmit_suc = true;
4628         }
4629
4630         if (!skb_used)
4631                 dev_kfree_skb_any(skb);
4632
4633         if (xmit_suc)
4634                 return NETDEV_TX_OK;
4635
4636         atomic_long_inc(&bond_dev->tx_dropped);
4637         return NET_XMIT_DROP;
4638 }
4639
4640 /*------------------------- Device initialization ---------------------------*/
4641
4642 /* Lookup the slave that corresponds to a qid */
4643 static inline int bond_slave_override(struct bonding *bond,
4644                                       struct sk_buff *skb)
4645 {
4646         struct slave *slave = NULL;
4647         struct list_head *iter;
4648
4649         if (!skb_rx_queue_recorded(skb))
4650                 return 1;
4651
4652         /* Find out if any slaves have the same mapping as this skb. */
4653         bond_for_each_slave_rcu(bond, slave, iter) {
4654                 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4655                         if (bond_slave_is_up(slave) &&
4656                             slave->link == BOND_LINK_UP) {
4657                                 bond_dev_queue_xmit(bond, skb, slave->dev);
4658                                 return 0;
4659                         }
4660                         /* If the slave isn't UP, use default transmit policy. */
4661                         break;
4662                 }
4663         }
4664
4665         return 1;
4666 }
4667
4668
4669 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4670                              struct net_device *sb_dev)
4671 {
4672         /* This helper function exists to help dev_pick_tx get the correct
4673          * destination queue.  Using a helper function skips a call to
4674          * skb_tx_hash and will put the skbs in the queue we expect on their
4675          * way down to the bonding driver.
4676          */
4677         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4678
4679         /* Save the original txq to restore before passing to the driver */
4680         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4681
4682         if (unlikely(txq >= dev->real_num_tx_queues)) {
4683                 do {
4684                         txq -= dev->real_num_tx_queues;
4685                 } while (txq >= dev->real_num_tx_queues);
4686         }
4687         return txq;
4688 }
4689
4690 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
4691                                               struct sk_buff *skb,
4692                                               bool all_slaves)
4693 {
4694         struct bonding *bond = netdev_priv(master_dev);
4695         struct bond_up_slave *slaves;
4696         struct slave *slave = NULL;
4697
4698         switch (BOND_MODE(bond)) {
4699         case BOND_MODE_ROUNDROBIN:
4700                 slave = bond_xmit_roundrobin_slave_get(bond, skb);
4701                 break;
4702         case BOND_MODE_ACTIVEBACKUP:
4703                 slave = bond_xmit_activebackup_slave_get(bond, skb);
4704                 break;
4705         case BOND_MODE_8023AD:
4706         case BOND_MODE_XOR:
4707                 if (all_slaves)
4708                         slaves = rcu_dereference(bond->all_slaves);
4709                 else
4710                         slaves = rcu_dereference(bond->usable_slaves);
4711                 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4712                 break;
4713         case BOND_MODE_BROADCAST:
4714                 break;
4715         case BOND_MODE_ALB:
4716                 slave = bond_xmit_alb_slave_get(bond, skb);
4717                 break;
4718         case BOND_MODE_TLB:
4719                 slave = bond_xmit_tlb_slave_get(bond, skb);
4720                 break;
4721         default:
4722                 /* Should never happen, mode already checked */
4723                 WARN_ONCE(true, "Unknown bonding mode");
4724                 break;
4725         }
4726
4727         if (slave)
4728                 return slave->dev;
4729         return NULL;
4730 }
4731
4732 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4733 {
4734         struct bonding *bond = netdev_priv(dev);
4735
4736         if (bond_should_override_tx_queue(bond) &&
4737             !bond_slave_override(bond, skb))
4738                 return NETDEV_TX_OK;
4739
4740         switch (BOND_MODE(bond)) {
4741         case BOND_MODE_ROUNDROBIN:
4742                 return bond_xmit_roundrobin(skb, dev);
4743         case BOND_MODE_ACTIVEBACKUP:
4744                 return bond_xmit_activebackup(skb, dev);
4745         case BOND_MODE_8023AD:
4746         case BOND_MODE_XOR:
4747                 return bond_3ad_xor_xmit(skb, dev);
4748         case BOND_MODE_BROADCAST:
4749                 return bond_xmit_broadcast(skb, dev);
4750         case BOND_MODE_ALB:
4751                 return bond_alb_xmit(skb, dev);
4752         case BOND_MODE_TLB:
4753                 return bond_tlb_xmit(skb, dev);
4754         default:
4755                 /* Should never happen, mode already checked */
4756                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4757                 WARN_ON_ONCE(1);
4758                 return bond_tx_drop(dev, skb);
4759         }
4760 }
4761
4762 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4763 {
4764         struct bonding *bond = netdev_priv(dev);
4765         netdev_tx_t ret = NETDEV_TX_OK;
4766
4767         /* If we risk deadlock from transmitting this in the
4768          * netpoll path, tell netpoll to queue the frame for later tx
4769          */
4770         if (unlikely(is_netpoll_tx_blocked(dev)))
4771                 return NETDEV_TX_BUSY;
4772
4773         rcu_read_lock();
4774         if (bond_has_slaves(bond))
4775                 ret = __bond_start_xmit(skb, dev);
4776         else
4777                 ret = bond_tx_drop(dev, skb);
4778         rcu_read_unlock();
4779
4780         return ret;
4781 }
4782
4783 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
4784 {
4785         if (speed == 0 || speed == SPEED_UNKNOWN)
4786                 speed = slave->speed;
4787         else
4788                 speed = min(speed, slave->speed);
4789
4790         return speed;
4791 }
4792
4793 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4794                                            struct ethtool_link_ksettings *cmd)
4795 {
4796         struct bonding *bond = netdev_priv(bond_dev);
4797         struct list_head *iter;
4798         struct slave *slave;
4799         u32 speed = 0;
4800
4801         cmd->base.duplex = DUPLEX_UNKNOWN;
4802         cmd->base.port = PORT_OTHER;
4803
4804         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4805          * do not need to check mode.  Though link speed might not represent
4806          * the true receive or transmit bandwidth (not all modes are symmetric)
4807          * this is an accurate maximum.
4808          */
4809         bond_for_each_slave(bond, slave, iter) {
4810                 if (bond_slave_can_tx(slave)) {
4811                         if (slave->speed != SPEED_UNKNOWN) {
4812                                 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
4813                                         speed = bond_mode_bcast_speed(slave,
4814                                                                       speed);
4815                                 else
4816                                         speed += slave->speed;
4817                         }
4818                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4819                             slave->duplex != DUPLEX_UNKNOWN)
4820                                 cmd->base.duplex = slave->duplex;
4821                 }
4822         }
4823         cmd->base.speed = speed ? : SPEED_UNKNOWN;
4824
4825         return 0;
4826 }
4827
4828 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4829                                      struct ethtool_drvinfo *drvinfo)
4830 {
4831         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4832         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4833                  BOND_ABI_VERSION);
4834 }
4835
4836 static const struct ethtool_ops bond_ethtool_ops = {
4837         .get_drvinfo            = bond_ethtool_get_drvinfo,
4838         .get_link               = ethtool_op_get_link,
4839         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4840 };
4841
4842 static const struct net_device_ops bond_netdev_ops = {
4843         .ndo_init               = bond_init,
4844         .ndo_uninit             = bond_uninit,
4845         .ndo_open               = bond_open,
4846         .ndo_stop               = bond_close,
4847         .ndo_start_xmit         = bond_start_xmit,
4848         .ndo_select_queue       = bond_select_queue,
4849         .ndo_get_stats64        = bond_get_stats,
4850         .ndo_do_ioctl           = bond_do_ioctl,
4851         .ndo_change_rx_flags    = bond_change_rx_flags,
4852         .ndo_set_rx_mode        = bond_set_rx_mode,
4853         .ndo_change_mtu         = bond_change_mtu,
4854         .ndo_set_mac_address    = bond_set_mac_address,
4855         .ndo_neigh_setup        = bond_neigh_setup,
4856         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4857         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4858 #ifdef CONFIG_NET_POLL_CONTROLLER
4859         .ndo_netpoll_setup      = bond_netpoll_setup,
4860         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4861         .ndo_poll_controller    = bond_poll_controller,
4862 #endif
4863         .ndo_add_slave          = bond_enslave,
4864         .ndo_del_slave          = bond_release,
4865         .ndo_fix_features       = bond_fix_features,
4866         .ndo_features_check     = passthru_features_check,
4867         .ndo_get_xmit_slave     = bond_xmit_get_slave,
4868 };
4869
4870 static const struct device_type bond_type = {
4871         .name = "bond",
4872 };
4873
4874 static void bond_destructor(struct net_device *bond_dev)
4875 {
4876         struct bonding *bond = netdev_priv(bond_dev);
4877         if (bond->wq)
4878                 destroy_workqueue(bond->wq);
4879 }
4880
4881 void bond_setup(struct net_device *bond_dev)
4882 {
4883         struct bonding *bond = netdev_priv(bond_dev);
4884
4885         spin_lock_init(&bond->mode_lock);
4886         bond->params = bonding_defaults;
4887
4888         /* Initialize pointers */
4889         bond->dev = bond_dev;
4890
4891         /* Initialize the device entry points */
4892         ether_setup(bond_dev);
4893         bond_dev->max_mtu = ETH_MAX_MTU;
4894         bond_dev->netdev_ops = &bond_netdev_ops;
4895         bond_dev->ethtool_ops = &bond_ethtool_ops;
4896
4897         bond_dev->needs_free_netdev = true;
4898         bond_dev->priv_destructor = bond_destructor;
4899
4900         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4901
4902         /* Initialize the device options */
4903         bond_dev->flags |= IFF_MASTER;
4904         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4905         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4906
4907 #ifdef CONFIG_XFRM_OFFLOAD
4908         /* set up xfrm device ops (only supported in active-backup right now) */
4909         bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
4910         INIT_LIST_HEAD(&bond->ipsec_list);
4911         spin_lock_init(&bond->ipsec_lock);
4912 #endif /* CONFIG_XFRM_OFFLOAD */
4913
4914         /* don't acquire bond device's netif_tx_lock when transmitting */
4915         bond_dev->features |= NETIF_F_LLTX;
4916
4917         /* By default, we declare the bond to be fully
4918          * VLAN hardware accelerated capable. Special
4919          * care is taken in the various xmit functions
4920          * when there are slaves that are not hw accel
4921          * capable
4922          */
4923
4924         /* Don't allow bond devices to change network namespaces. */
4925         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4926
4927         bond_dev->hw_features = BOND_VLAN_FEATURES |
4928                                 NETIF_F_HW_VLAN_CTAG_RX |
4929                                 NETIF_F_HW_VLAN_CTAG_FILTER |
4930                                 NETIF_F_HW_VLAN_STAG_RX |
4931                                 NETIF_F_HW_VLAN_STAG_FILTER;
4932
4933         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4;
4934 #ifdef CONFIG_XFRM_OFFLOAD
4935         bond_dev->hw_features |= BOND_XFRM_FEATURES;
4936 #endif /* CONFIG_XFRM_OFFLOAD */
4937         bond_dev->features |= bond_dev->hw_features;
4938         bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4939 #ifdef CONFIG_XFRM_OFFLOAD
4940         /* Disable XFRM features if this isn't an active-backup config */
4941         if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
4942                 bond_dev->features &= ~BOND_XFRM_FEATURES;
4943 #endif /* CONFIG_XFRM_OFFLOAD */
4944 }
4945
4946 /* Destroy a bonding device.
4947  * Must be under rtnl_lock when this function is called.
4948  */
4949 static void bond_uninit(struct net_device *bond_dev)
4950 {
4951         struct bonding *bond = netdev_priv(bond_dev);
4952         struct bond_up_slave *usable, *all;
4953         struct list_head *iter;
4954         struct slave *slave;
4955
4956         bond_netpoll_cleanup(bond_dev);
4957
4958         /* Release the bonded slaves */
4959         bond_for_each_slave(bond, slave, iter)
4960                 __bond_release_one(bond_dev, slave->dev, true, true);
4961         netdev_info(bond_dev, "Released all slaves\n");
4962
4963         usable = rtnl_dereference(bond->usable_slaves);
4964         if (usable) {
4965                 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4966                 kfree_rcu(usable, rcu);
4967         }
4968
4969         all = rtnl_dereference(bond->all_slaves);
4970         if (all) {
4971                 RCU_INIT_POINTER(bond->all_slaves, NULL);
4972                 kfree_rcu(all, rcu);
4973         }
4974
4975         list_del(&bond->bond_list);
4976
4977         bond_debug_unregister(bond);
4978 }
4979
4980 /*------------------------- Module initialization ---------------------------*/
4981
4982 static int bond_check_params(struct bond_params *params)
4983 {
4984         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4985         struct bond_opt_value newval;
4986         const struct bond_opt_value *valptr;
4987         int arp_all_targets_value = 0;
4988         u16 ad_actor_sys_prio = 0;
4989         u16 ad_user_port_key = 0;
4990         __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4991         int arp_ip_count;
4992         int bond_mode   = BOND_MODE_ROUNDROBIN;
4993         int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4994         int lacp_fast = 0;
4995         int tlb_dynamic_lb;
4996
4997         /* Convert string parameters. */
4998         if (mode) {
4999                 bond_opt_initstr(&newval, mode);
5000                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
5001                 if (!valptr) {
5002                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
5003                         return -EINVAL;
5004                 }
5005                 bond_mode = valptr->value;
5006         }
5007
5008         if (xmit_hash_policy) {
5009                 if (bond_mode == BOND_MODE_ROUNDROBIN ||
5010                     bond_mode == BOND_MODE_ACTIVEBACKUP ||
5011                     bond_mode == BOND_MODE_BROADCAST) {
5012                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
5013                                 bond_mode_name(bond_mode));
5014                 } else {
5015                         bond_opt_initstr(&newval, xmit_hash_policy);
5016                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
5017                                                 &newval);
5018                         if (!valptr) {
5019                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
5020                                        xmit_hash_policy);
5021                                 return -EINVAL;
5022                         }
5023                         xmit_hashtype = valptr->value;
5024                 }
5025         }
5026
5027         if (lacp_rate) {
5028                 if (bond_mode != BOND_MODE_8023AD) {
5029                         pr_info("lacp_rate param is irrelevant in mode %s\n",
5030                                 bond_mode_name(bond_mode));
5031                 } else {
5032                         bond_opt_initstr(&newval, lacp_rate);
5033                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
5034                                                 &newval);
5035                         if (!valptr) {
5036                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
5037                                        lacp_rate);
5038                                 return -EINVAL;
5039                         }
5040                         lacp_fast = valptr->value;
5041                 }
5042         }
5043
5044         if (ad_select) {
5045                 bond_opt_initstr(&newval, ad_select);
5046                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
5047                                         &newval);
5048                 if (!valptr) {
5049                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
5050                         return -EINVAL;
5051                 }
5052                 params->ad_select = valptr->value;
5053                 if (bond_mode != BOND_MODE_8023AD)
5054                         pr_warn("ad_select param only affects 802.3ad mode\n");
5055         } else {
5056                 params->ad_select = BOND_AD_STABLE;
5057         }
5058
5059         if (max_bonds < 0) {
5060                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
5061                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
5062                 max_bonds = BOND_DEFAULT_MAX_BONDS;
5063         }
5064
5065         if (miimon < 0) {
5066                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5067                         miimon, INT_MAX);
5068                 miimon = 0;
5069         }
5070
5071         if (updelay < 0) {
5072                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5073                         updelay, INT_MAX);
5074                 updelay = 0;
5075         }
5076
5077         if (downdelay < 0) {
5078                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5079                         downdelay, INT_MAX);
5080                 downdelay = 0;
5081         }
5082
5083         if ((use_carrier != 0) && (use_carrier != 1)) {
5084                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
5085                         use_carrier);
5086                 use_carrier = 1;
5087         }
5088
5089         if (num_peer_notif < 0 || num_peer_notif > 255) {
5090                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
5091                         num_peer_notif);
5092                 num_peer_notif = 1;
5093         }
5094
5095         /* reset values for 802.3ad/TLB/ALB */
5096         if (!bond_mode_uses_arp(bond_mode)) {
5097                 if (!miimon) {
5098                         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");
5099                         pr_warn("Forcing miimon to 100msec\n");
5100                         miimon = BOND_DEFAULT_MIIMON;
5101                 }
5102         }
5103
5104         if (tx_queues < 1 || tx_queues > 255) {
5105                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
5106                         tx_queues, BOND_DEFAULT_TX_QUEUES);
5107                 tx_queues = BOND_DEFAULT_TX_QUEUES;
5108         }
5109
5110         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
5111                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
5112                         all_slaves_active);
5113                 all_slaves_active = 0;
5114         }
5115
5116         if (resend_igmp < 0 || resend_igmp > 255) {
5117                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
5118                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
5119                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
5120         }
5121
5122         bond_opt_initval(&newval, packets_per_slave);
5123         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
5124                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
5125                         packets_per_slave, USHRT_MAX);
5126                 packets_per_slave = 1;
5127         }
5128
5129         if (bond_mode == BOND_MODE_ALB) {
5130                 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",
5131                           updelay);
5132         }
5133
5134         if (!miimon) {
5135                 if (updelay || downdelay) {
5136                         /* just warn the user the up/down delay will have
5137                          * no effect since miimon is zero...
5138                          */
5139                         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",
5140                                 updelay, downdelay);
5141                 }
5142         } else {
5143                 /* don't allow arp monitoring */
5144                 if (arp_interval) {
5145                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
5146                                 miimon, arp_interval);
5147                         arp_interval = 0;
5148                 }
5149
5150                 if ((updelay % miimon) != 0) {
5151                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
5152                                 updelay, miimon, (updelay / miimon) * miimon);
5153                 }
5154
5155                 updelay /= miimon;
5156
5157                 if ((downdelay % miimon) != 0) {
5158                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
5159                                 downdelay, miimon,
5160                                 (downdelay / miimon) * miimon);
5161                 }
5162
5163                 downdelay /= miimon;
5164         }
5165
5166         if (arp_interval < 0) {
5167                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5168                         arp_interval, INT_MAX);
5169                 arp_interval = 0;
5170         }
5171
5172         for (arp_ip_count = 0, i = 0;
5173              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
5174                 __be32 ip;
5175
5176                 /* not a complete check, but good enough to catch mistakes */
5177                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
5178                     !bond_is_ip_target_ok(ip)) {
5179                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
5180                                 arp_ip_target[i]);
5181                         arp_interval = 0;
5182                 } else {
5183                         if (bond_get_targets_ip(arp_target, ip) == -1)
5184                                 arp_target[arp_ip_count++] = ip;
5185                         else
5186                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
5187                                         &ip);
5188                 }
5189         }
5190
5191         if (arp_interval && !arp_ip_count) {
5192                 /* don't allow arping if no arp_ip_target given... */
5193                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
5194                         arp_interval);
5195                 arp_interval = 0;
5196         }
5197
5198         if (arp_validate) {
5199                 if (!arp_interval) {
5200                         pr_err("arp_validate requires arp_interval\n");
5201                         return -EINVAL;
5202                 }
5203
5204                 bond_opt_initstr(&newval, arp_validate);
5205                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
5206                                         &newval);
5207                 if (!valptr) {
5208                         pr_err("Error: invalid arp_validate \"%s\"\n",
5209                                arp_validate);
5210                         return -EINVAL;
5211                 }
5212                 arp_validate_value = valptr->value;
5213         } else {
5214                 arp_validate_value = 0;
5215         }
5216
5217         if (arp_all_targets) {
5218                 bond_opt_initstr(&newval, arp_all_targets);
5219                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
5220                                         &newval);
5221                 if (!valptr) {
5222                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
5223                                arp_all_targets);
5224                         arp_all_targets_value = 0;
5225                 } else {
5226                         arp_all_targets_value = valptr->value;
5227                 }
5228         }
5229
5230         if (miimon) {
5231                 pr_info("MII link monitoring set to %d ms\n", miimon);
5232         } else if (arp_interval) {
5233                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
5234                                           arp_validate_value);
5235                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5236                         arp_interval, valptr->string, arp_ip_count);
5237
5238                 for (i = 0; i < arp_ip_count; i++)
5239                         pr_cont(" %s", arp_ip_target[i]);
5240
5241                 pr_cont("\n");
5242
5243         } else if (max_bonds) {
5244                 /* miimon and arp_interval not set, we need one so things
5245                  * work as expected, see bonding.txt for details
5246                  */
5247                 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");
5248         }
5249
5250         if (primary && !bond_mode_uses_primary(bond_mode)) {
5251                 /* currently, using a primary only makes sense
5252                  * in active backup, TLB or ALB modes
5253                  */
5254                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
5255                         primary, bond_mode_name(bond_mode));
5256                 primary = NULL;
5257         }
5258
5259         if (primary && primary_reselect) {
5260                 bond_opt_initstr(&newval, primary_reselect);
5261                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
5262                                         &newval);
5263                 if (!valptr) {
5264                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
5265                                primary_reselect);
5266                         return -EINVAL;
5267                 }
5268                 primary_reselect_value = valptr->value;
5269         } else {
5270                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5271         }
5272
5273         if (fail_over_mac) {
5274                 bond_opt_initstr(&newval, fail_over_mac);
5275                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
5276                                         &newval);
5277                 if (!valptr) {
5278                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
5279                                fail_over_mac);
5280                         return -EINVAL;
5281                 }
5282                 fail_over_mac_value = valptr->value;
5283                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5284                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
5285         } else {
5286                 fail_over_mac_value = BOND_FOM_NONE;
5287         }
5288
5289         bond_opt_initstr(&newval, "default");
5290         valptr = bond_opt_parse(
5291                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
5292                                      &newval);
5293         if (!valptr) {
5294                 pr_err("Error: No ad_actor_sys_prio default value");
5295                 return -EINVAL;
5296         }
5297         ad_actor_sys_prio = valptr->value;
5298
5299         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
5300                                 &newval);
5301         if (!valptr) {
5302                 pr_err("Error: No ad_user_port_key default value");
5303                 return -EINVAL;
5304         }
5305         ad_user_port_key = valptr->value;
5306
5307         bond_opt_initstr(&newval, "default");
5308         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
5309         if (!valptr) {
5310                 pr_err("Error: No tlb_dynamic_lb default value");
5311                 return -EINVAL;
5312         }
5313         tlb_dynamic_lb = valptr->value;
5314
5315         if (lp_interval == 0) {
5316                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
5317                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
5318                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
5319         }
5320
5321         /* fill params struct with the proper values */
5322         params->mode = bond_mode;
5323         params->xmit_policy = xmit_hashtype;
5324         params->miimon = miimon;
5325         params->num_peer_notif = num_peer_notif;
5326         params->arp_interval = arp_interval;
5327         params->arp_validate = arp_validate_value;
5328         params->arp_all_targets = arp_all_targets_value;
5329         params->updelay = updelay;
5330         params->downdelay = downdelay;
5331         params->peer_notif_delay = 0;
5332         params->use_carrier = use_carrier;
5333         params->lacp_fast = lacp_fast;
5334         params->primary[0] = 0;
5335         params->primary_reselect = primary_reselect_value;
5336         params->fail_over_mac = fail_over_mac_value;
5337         params->tx_queues = tx_queues;
5338         params->all_slaves_active = all_slaves_active;
5339         params->resend_igmp = resend_igmp;
5340         params->min_links = min_links;
5341         params->lp_interval = lp_interval;
5342         params->packets_per_slave = packets_per_slave;
5343         params->tlb_dynamic_lb = tlb_dynamic_lb;
5344         params->ad_actor_sys_prio = ad_actor_sys_prio;
5345         eth_zero_addr(params->ad_actor_system);
5346         params->ad_user_port_key = ad_user_port_key;
5347         if (packets_per_slave > 0) {
5348                 params->reciprocal_packets_per_slave =
5349                         reciprocal_value(packets_per_slave);
5350         } else {
5351                 /* reciprocal_packets_per_slave is unused if
5352                  * packets_per_slave is 0 or 1, just initialize it
5353                  */
5354                 params->reciprocal_packets_per_slave =
5355                         (struct reciprocal_value) { 0 };
5356         }
5357
5358         if (primary) {
5359                 strncpy(params->primary, primary, IFNAMSIZ);
5360                 params->primary[IFNAMSIZ - 1] = 0;
5361         }
5362
5363         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5364
5365         return 0;
5366 }
5367
5368 /* Called from registration process */
5369 static int bond_init(struct net_device *bond_dev)
5370 {
5371         struct bonding *bond = netdev_priv(bond_dev);
5372         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5373
5374         netdev_dbg(bond_dev, "Begin bond_init\n");
5375
5376         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
5377         if (!bond->wq)
5378                 return -ENOMEM;
5379
5380         bond->notifier_ctx = false;
5381
5382         spin_lock_init(&bond->stats_lock);
5383         netdev_lockdep_set_classes(bond_dev);
5384
5385         list_add_tail(&bond->bond_list, &bn->dev_list);
5386
5387         bond_prepare_sysfs_group(bond);
5388
5389         bond_debug_register(bond);
5390
5391         /* Ensure valid dev_addr */
5392         if (is_zero_ether_addr(bond_dev->dev_addr) &&
5393             bond_dev->addr_assign_type == NET_ADDR_PERM)
5394                 eth_hw_addr_random(bond_dev);
5395
5396         return 0;
5397 }
5398
5399 unsigned int bond_get_num_tx_queues(void)
5400 {
5401         return tx_queues;
5402 }
5403
5404 /* Create a new bond based on the specified name and bonding parameters.
5405  * If name is NULL, obtain a suitable "bond%d" name for us.
5406  * Caller must NOT hold rtnl_lock; we need to release it here before we
5407  * set up our sysfs entries.
5408  */
5409 int bond_create(struct net *net, const char *name)
5410 {
5411         struct net_device *bond_dev;
5412         struct bonding *bond;
5413         struct alb_bond_info *bond_info;
5414         int res;
5415
5416         rtnl_lock();
5417
5418         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
5419                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
5420                                    bond_setup, tx_queues);
5421         if (!bond_dev) {
5422                 pr_err("%s: eek! can't alloc netdev!\n", name);
5423                 rtnl_unlock();
5424                 return -ENOMEM;
5425         }
5426
5427         /*
5428          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
5429          * It is set to 0 by default which is wrong.
5430          */
5431         bond = netdev_priv(bond_dev);
5432         bond_info = &(BOND_ALB_INFO(bond));
5433         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
5434
5435         dev_net_set(bond_dev, net);
5436         bond_dev->rtnl_link_ops = &bond_link_ops;
5437
5438         res = register_netdevice(bond_dev);
5439         if (res < 0) {
5440                 free_netdev(bond_dev);
5441                 rtnl_unlock();
5442
5443                 return res;
5444         }
5445
5446         netif_carrier_off(bond_dev);
5447
5448         bond_work_init_all(bond);
5449
5450         rtnl_unlock();
5451         return 0;
5452 }
5453
5454 static int __net_init bond_net_init(struct net *net)
5455 {
5456         struct bond_net *bn = net_generic(net, bond_net_id);
5457
5458         bn->net = net;
5459         INIT_LIST_HEAD(&bn->dev_list);
5460
5461         bond_create_proc_dir(bn);
5462         bond_create_sysfs(bn);
5463
5464         return 0;
5465 }
5466
5467 static void __net_exit bond_net_exit(struct net *net)
5468 {
5469         struct bond_net *bn = net_generic(net, bond_net_id);
5470         struct bonding *bond, *tmp_bond;
5471         LIST_HEAD(list);
5472
5473         bond_destroy_sysfs(bn);
5474
5475         /* Kill off any bonds created after unregistering bond rtnl ops */
5476         rtnl_lock();
5477         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
5478                 unregister_netdevice_queue(bond->dev, &list);
5479         unregister_netdevice_many(&list);
5480         rtnl_unlock();
5481
5482         bond_destroy_proc_dir(bn);
5483 }
5484
5485 static struct pernet_operations bond_net_ops = {
5486         .init = bond_net_init,
5487         .exit = bond_net_exit,
5488         .id   = &bond_net_id,
5489         .size = sizeof(struct bond_net),
5490 };
5491
5492 static int __init bonding_init(void)
5493 {
5494         int i;
5495         int res;
5496
5497         res = bond_check_params(&bonding_defaults);
5498         if (res)
5499                 goto out;
5500
5501         res = register_pernet_subsys(&bond_net_ops);
5502         if (res)
5503                 goto out;
5504
5505         res = bond_netlink_init();
5506         if (res)
5507                 goto err_link;
5508
5509         bond_create_debugfs();
5510
5511         for (i = 0; i < max_bonds; i++) {
5512                 res = bond_create(&init_net, NULL);
5513                 if (res)
5514                         goto err;
5515         }
5516
5517         skb_flow_dissector_init(&flow_keys_bonding,
5518                                 flow_keys_bonding_keys,
5519                                 ARRAY_SIZE(flow_keys_bonding_keys));
5520
5521         register_netdevice_notifier(&bond_netdev_notifier);
5522 out:
5523         return res;
5524 err:
5525         bond_destroy_debugfs();
5526         bond_netlink_fini();
5527 err_link:
5528         unregister_pernet_subsys(&bond_net_ops);
5529         goto out;
5530
5531 }
5532
5533 static void __exit bonding_exit(void)
5534 {
5535         unregister_netdevice_notifier(&bond_netdev_notifier);
5536
5537         bond_destroy_debugfs();
5538
5539         bond_netlink_fini();
5540         unregister_pernet_subsys(&bond_net_ops);
5541
5542 #ifdef CONFIG_NET_POLL_CONTROLLER
5543         /* Make sure we don't have an imbalance on our netpoll blocking */
5544         WARN_ON(atomic_read(&netpoll_block_tx));
5545 #endif
5546 }
5547
5548 module_init(bonding_init);
5549 module_exit(bonding_exit);
5550 MODULE_LICENSE("GPL");
5551 MODULE_DESCRIPTION(DRV_DESCRIPTION);
5552 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");