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 #if IS_ENABLED(CONFIG_TLS_DEVICE)
  87 #include <net/tls.h>
  88 #endif
  89
  90 #include "bonding_priv.h"
  91
  92 /*---------------------------- Module parameters ----------------------------*/
  93
  94 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  95
  96 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  97 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  98 static int num_peer_notif = 1;
  99 static int miimon;
 100 static int updelay;
 101 static int downdelay;
 102 static int use_carrier  = 1;
 103 static char *mode;
 104 static char *primary;
 105 static char *primary_reselect;
 106 static char *lacp_rate;
 107 static int min_links;
 108 static char *ad_select;
 109 static char *xmit_hash_policy;
 110 static int arp_interval;
 111 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 112 static char *arp_validate;
 113 static char *arp_all_targets;
 114 static char *fail_over_mac;
 115 static int all_slaves_active;
 116 static struct bond_params bonding_defaults;
 117 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 118 static int packets_per_slave = 1;
 119 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 120
 121 module_param(max_bonds, int, 0);
 122 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 123 module_param(tx_queues, int, 0);
 124 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 125 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 126 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 127                                "failover event (alias of num_unsol_na)");
 128 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 129 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 130                                "failover event (alias of num_grat_arp)");
 131 module_param(miimon, int, 0);
 132 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 133 module_param(updelay, int, 0);
 134 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 135 module_param(downdelay, int, 0);
 136 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 137                             "in milliseconds");
 138 module_param(use_carrier, int, 0);
 139 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 140                               "0 for off, 1 for on (default)");
 141 module_param(mode, charp, 0);
 142 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 143                        "1 for active-backup, 2 for balance-xor, "
 144                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 145                        "6 for balance-alb");
 146 module_param(primary, charp, 0);
 147 MODULE_PARM_DESC(primary, "Primary network device to use");
 148 module_param(primary_reselect, charp, 0);
 149 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 150                                    "once it comes up; "
 151                                    "0 for always (default), "
 152                                    "1 for only if speed of primary is "
 153                                    "better, "
 154                                    "2 for only on active slave "
 155                                    "failure");
 156 module_param(lacp_rate, charp, 0);
 157 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 158                             "0 for slow, 1 for fast");
 159 module_param(ad_select, charp, 0);
 160 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 161                             "0 for stable (default), 1 for bandwidth, "
 162                             "2 for count");
 163 module_param(min_links, int, 0);
 164 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 165
 166 module_param(xmit_hash_policy, charp, 0);
 167 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
 168                                    "0 for layer 2 (default), 1 for layer 3+4, "
 169                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 170                                    "4 for encap layer 3+4, 5 for vlan+srcmac");
 171 module_param(arp_interval, int, 0);
 172 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 173 module_param_array(arp_ip_target, charp, NULL, 0);
 174 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 175 module_param(arp_validate, charp, 0);
 176 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 177                                "0 for none (default), 1 for active, "
 178                                "2 for backup, 3 for all");
 179 module_param(arp_all_targets, charp, 0);
 180 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 181 module_param(fail_over_mac, charp, 0);
 182 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 183                                 "the same MAC; 0 for none (default), "
 184                                 "1 for active, 2 for follow");
 185 module_param(all_slaves_active, int, 0);
 186 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 187                                      "by setting active flag for all slaves; "
 188                                      "0 for never (default), 1 for always.");
 189 module_param(resend_igmp, int, 0);
 190 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 191                               "link failure");
 192 module_param(packets_per_slave, int, 0);
 193 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 194                                     "mode; 0 for a random slave, 1 packet per "
 195                                     "slave (default), >1 packets per slave.");
 196 module_param(lp_interval, uint, 0);
 197 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 198                               "the bonding driver sends learning packets to "
 199                               "each slaves peer switch. The default is 1.");
 200
 201 /*----------------------------- Global variables ----------------------------*/
 202
 203 #ifdef CONFIG_NET_POLL_CONTROLLER
 204 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 205 #endif
 206
 207 unsigned int bond_net_id __read_mostly;
 208
 209 static const struct flow_dissector_key flow_keys_bonding_keys[] = {
 210         {
 211                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
 212                 .offset = offsetof(struct flow_keys, control),
 213         },
 214         {
 215                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
 216                 .offset = offsetof(struct flow_keys, basic),
 217         },
 218         {
 219                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 220                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
 221         },
 222         {
 223                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 224                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
 225         },
 226         {
 227                 .key_id = FLOW_DISSECTOR_KEY_TIPC,
 228                 .offset = offsetof(struct flow_keys, addrs.tipckey),
 229         },
 230         {
 231                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
 232                 .offset = offsetof(struct flow_keys, ports),
 233         },
 234         {
 235                 .key_id = FLOW_DISSECTOR_KEY_ICMP,
 236                 .offset = offsetof(struct flow_keys, icmp),
 237         },
 238         {
 239                 .key_id = FLOW_DISSECTOR_KEY_VLAN,
 240                 .offset = offsetof(struct flow_keys, vlan),
 241         },
 242         {
 243                 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
 244                 .offset = offsetof(struct flow_keys, tags),
 245         },
 246         {
 247                 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
 248                 .offset = offsetof(struct flow_keys, keyid),
 249         },
 250 };
 251
 252 static struct flow_dissector flow_keys_bonding __read_mostly;
 253
 254 /*-------------------------- Forward declarations ---------------------------*/
 255
 256 static int bond_init(struct net_device *bond_dev);
 257 static void bond_uninit(struct net_device *bond_dev);
 258 static void bond_get_stats(struct net_device *bond_dev,
 259                            struct rtnl_link_stats64 *stats);
 260 static void bond_slave_arr_handler(struct work_struct *work);
 261 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 262                                   int mod);
 263 static void bond_netdev_notify_work(struct work_struct *work);
 264
 265 /*---------------------------- General routines -----------------------------*/
 266
 267 const char *bond_mode_name(int mode)
 268 {
 269         static const char *names[] = {
 270                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 271                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 272                 [BOND_MODE_XOR] = "load balancing (xor)",
 273                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 274                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 275                 [BOND_MODE_TLB] = "transmit load balancing",
 276                 [BOND_MODE_ALB] = "adaptive load balancing",
 277         };
 278
 279         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 280                 return "unknown";
 281
 282         return names[mode];
 283 }
 284
 285 /**
 286  * bond_dev_queue_xmit - Prepare skb for xmit.
 287  *
 288  * @bond: bond device that got this skb for tx.
 289  * @skb: hw accel VLAN tagged skb to transmit
 290  * @slave_dev: slave that is supposed to xmit this skbuff
 291  */
 292 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 293                         struct net_device *slave_dev)
 294 {
 295         skb->dev = slave_dev;
 296
 297         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 298                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 299         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 300
 301         if (unlikely(netpoll_tx_running(bond->dev)))
 302                 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 303
 304         return dev_queue_xmit(skb);
 305 }
 306
 307 bool bond_sk_check(struct bonding *bond)
 308 {
 309         switch (BOND_MODE(bond)) {
 310         case BOND_MODE_8023AD:
 311         case BOND_MODE_XOR:
 312                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
 313                         return true;
 314                 fallthrough;
 315         default:
 316                 return false;
 317         }
 318 }
 319
 320 /*---------------------------------- VLAN -----------------------------------*/
 321
 322 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 323  * We don't protect the slave list iteration with a lock because:
 324  * a. This operation is performed in IOCTL context,
 325  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 326  * c. Holding a lock with BH disabled while directly calling a base driver
 327  *    entry point is generally a BAD idea.
 328  *
 329  * The design of synchronization/protection for this operation in the 8021q
 330  * module is good for one or more VLAN devices over a single physical device
 331  * and cannot be extended for a teaming solution like bonding, so there is a
 332  * potential race condition here where a net device from the vlan group might
 333  * be referenced (either by a base driver or the 8021q code) while it is being
 334  * removed from the system. However, it turns out we're not making matters
 335  * worse, and if it works for regular VLAN usage it will work here too.
 336 */
 337
 338 /**
 339  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 340  * @bond_dev: bonding net device that got called
 341  * @proto: network protocol ID
 342  * @vid: vlan id being added
 343  */
 344 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 345                                 __be16 proto, u16 vid)
 346 {
 347         struct bonding *bond = netdev_priv(bond_dev);
 348         struct slave *slave, *rollback_slave;
 349         struct list_head *iter;
 350         int res;
 351
 352         bond_for_each_slave(bond, slave, iter) {
 353                 res = vlan_vid_add(slave->dev, proto, vid);
 354                 if (res)
 355                         goto unwind;
 356         }
 357
 358         return 0;
 359
 360 unwind:
 361         /* unwind to the slave that failed */
 362         bond_for_each_slave(bond, rollback_slave, iter) {
 363                 if (rollback_slave == slave)
 364                         break;
 365
 366                 vlan_vid_del(rollback_slave->dev, proto, vid);
 367         }
 368
 369         return res;
 370 }
 371
 372 /**
 373  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 374  * @bond_dev: bonding net device that got called
 375  * @proto: network protocol ID
 376  * @vid: vlan id being removed
 377  */
 378 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 379                                  __be16 proto, u16 vid)
 380 {
 381         struct bonding *bond = netdev_priv(bond_dev);
 382         struct list_head *iter;
 383         struct slave *slave;
 384
 385         bond_for_each_slave(bond, slave, iter)
 386                 vlan_vid_del(slave->dev, proto, vid);
 387
 388         if (bond_is_lb(bond))
 389                 bond_alb_clear_vlan(bond, vid);
 390
 391         return 0;
 392 }
 393
 394 /*---------------------------------- XFRM -----------------------------------*/
 395
 396 #ifdef CONFIG_XFRM_OFFLOAD
 397 /**
 398  * bond_ipsec_add_sa - program device with a security association
 399  * @xs: pointer to transformer state struct
 400  **/
 401 static int bond_ipsec_add_sa(struct xfrm_state *xs)
 402 {
 403         struct net_device *bond_dev = xs->xso.dev;
 404         struct bonding *bond;
 405         struct slave *slave;
 406
 407         if (!bond_dev)
 408                 return -EINVAL;
 409
 410         bond = netdev_priv(bond_dev);
 411         slave = rcu_dereference(bond->curr_active_slave);
 412         xs->xso.real_dev = slave->dev;
 413         bond->xs = xs;
 414
 415         if (!(slave->dev->xfrmdev_ops
 416               && slave->dev->xfrmdev_ops->xdo_dev_state_add)) {
 417                 slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n");
 418                 return -EINVAL;
 419         }
 420
 421         return slave->dev->xfrmdev_ops->xdo_dev_state_add(xs);
 422 }
 423
 424 /**
 425  * bond_ipsec_del_sa - clear out this specific SA
 426  * @xs: pointer to transformer state struct
 427  **/
 428 static void bond_ipsec_del_sa(struct xfrm_state *xs)
 429 {
 430         struct net_device *bond_dev = xs->xso.dev;
 431         struct bonding *bond;
 432         struct slave *slave;
 433
 434         if (!bond_dev)
 435                 return;
 436
 437         bond = netdev_priv(bond_dev);
 438         slave = rcu_dereference(bond->curr_active_slave);
 439
 440         if (!slave)
 441                 return;
 442
 443         xs->xso.real_dev = slave->dev;
 444
 445         if (!(slave->dev->xfrmdev_ops
 446               && slave->dev->xfrmdev_ops->xdo_dev_state_delete)) {
 447                 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
 448                 return;
 449         }
 450
 451         slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
 452 }
 453
 454 /**
 455  * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
 456  * @skb: current data packet
 457  * @xs: pointer to transformer state struct
 458  **/
 459 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 460 {
 461         struct net_device *bond_dev = xs->xso.dev;
 462         struct bonding *bond = netdev_priv(bond_dev);
 463         struct slave *curr_active = rcu_dereference(bond->curr_active_slave);
 464         struct net_device *slave_dev = curr_active->dev;
 465
 466         if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
 467                 return true;
 468
 469         if (!(slave_dev->xfrmdev_ops
 470               && slave_dev->xfrmdev_ops->xdo_dev_offload_ok)) {
 471                 slave_warn(bond_dev, slave_dev, "%s: no slave xdo_dev_offload_ok\n", __func__);
 472                 return false;
 473         }
 474
 475         xs->xso.real_dev = slave_dev;
 476         return slave_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
 477 }
 478
 479 static const struct xfrmdev_ops bond_xfrmdev_ops = {
 480         .xdo_dev_state_add = bond_ipsec_add_sa,
 481         .xdo_dev_state_delete = bond_ipsec_del_sa,
 482         .xdo_dev_offload_ok = bond_ipsec_offload_ok,
 483 };
 484 #endif /* CONFIG_XFRM_OFFLOAD */
 485
 486 /*------------------------------- Link status -------------------------------*/
 487
 488 /* Set the carrier state for the master according to the state of its
 489  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 490  * do special 802.3ad magic.
 491  *
 492  * Returns zero if carrier state does not change, nonzero if it does.
 493  */
 494 int bond_set_carrier(struct bonding *bond)
 495 {
 496         struct list_head *iter;
 497         struct slave *slave;
 498
 499         if (!bond_has_slaves(bond))
 500                 goto down;
 501
 502         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 503                 return bond_3ad_set_carrier(bond);
 504
 505         bond_for_each_slave(bond, slave, iter) {
 506                 if (slave->link == BOND_LINK_UP) {
 507                         if (!netif_carrier_ok(bond->dev)) {
 508                                 netif_carrier_on(bond->dev);
 509                                 return 1;
 510                         }
 511                         return 0;
 512                 }
 513         }
 514
 515 down:
 516         if (netif_carrier_ok(bond->dev)) {
 517                 netif_carrier_off(bond->dev);
 518                 return 1;
 519         }
 520         return 0;
 521 }
 522
 523 /* Get link speed and duplex from the slave's base driver
 524  * using ethtool. If for some reason the call fails or the
 525  * values are invalid, set speed and duplex to -1,
 526  * and return. Return 1 if speed or duplex settings are
 527  * UNKNOWN; 0 otherwise.
 528  */
 529 static int bond_update_speed_duplex(struct slave *slave)
 530 {
 531         struct net_device *slave_dev = slave->dev;
 532         struct ethtool_link_ksettings ecmd;
 533         int res;
 534
 535         slave->speed = SPEED_UNKNOWN;
 536         slave->duplex = DUPLEX_UNKNOWN;
 537
 538         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 539         if (res < 0)
 540                 return 1;
 541         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 542                 return 1;
 543         switch (ecmd.base.duplex) {
 544         case DUPLEX_FULL:
 545         case DUPLEX_HALF:
 546                 break;
 547         default:
 548                 return 1;
 549         }
 550
 551         slave->speed = ecmd.base.speed;
 552         slave->duplex = ecmd.base.duplex;
 553
 554         return 0;
 555 }
 556
 557 const char *bond_slave_link_status(s8 link)
 558 {
 559         switch (link) {
 560         case BOND_LINK_UP:
 561                 return "up";
 562         case BOND_LINK_FAIL:
 563                 return "going down";
 564         case BOND_LINK_DOWN:
 565                 return "down";
 566         case BOND_LINK_BACK:
 567                 return "going back";
 568         default:
 569                 return "unknown";
 570         }
 571 }
 572
 573 /* if <dev> supports MII link status reporting, check its link status.
 574  *
 575  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 576  * depending upon the setting of the use_carrier parameter.
 577  *
 578  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 579  * can't tell and just pretend it is), or 0, meaning that the link is
 580  * down.
 581  *
 582  * If reporting is non-zero, instead of faking link up, return -1 if
 583  * both ETHTOOL and MII ioctls fail (meaning the device does not
 584  * support them).  If use_carrier is set, return whatever it says.
 585  * It'd be nice if there was a good way to tell if a driver supports
 586  * netif_carrier, but there really isn't.
 587  */
 588 static int bond_check_dev_link(struct bonding *bond,
 589                                struct net_device *slave_dev, int reporting)
 590 {
 591         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 592         int (*ioctl)(struct net_device *, struct ifreq *, int);
 593         struct ifreq ifr;
 594         struct mii_ioctl_data *mii;
 595
 596         if (!reporting && !netif_running(slave_dev))
 597                 return 0;
 598
 599         if (bond->params.use_carrier)
 600                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 601
 602         /* Try to get link status using Ethtool first. */
 603         if (slave_dev->ethtool_ops->get_link)
 604                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 605                         BMSR_LSTATUS : 0;
 606
 607         /* Ethtool can't be used, fallback to MII ioctls. */
 608         ioctl = slave_ops->ndo_do_ioctl;
 609         if (ioctl) {
 610                 /* TODO: set pointer to correct ioctl on a per team member
 611                  *       bases to make this more efficient. that is, once
 612                  *       we determine the correct ioctl, we will always
 613                  *       call it and not the others for that team
 614                  *       member.
 615                  */
 616
 617                 /* We cannot assume that SIOCGMIIPHY will also read a
 618                  * register; not all network drivers (e.g., e100)
 619                  * support that.
 620                  */
 621
 622                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 623                 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 624                 mii = if_mii(&ifr);
 625                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 626                         mii->reg_num = MII_BMSR;
 627                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 628                                 return mii->val_out & BMSR_LSTATUS;
 629                 }
 630         }
 631
 632         /* If reporting, report that either there's no dev->do_ioctl,
 633          * or both SIOCGMIIREG and get_link failed (meaning that we
 634          * cannot report link status).  If not reporting, pretend
 635          * we're ok.
 636          */
 637         return reporting ? -1 : BMSR_LSTATUS;
 638 }
 639
 640 /*----------------------------- Multicast list ------------------------------*/
 641
 642 /* Push the promiscuity flag down to appropriate slaves */
 643 static int bond_set_promiscuity(struct bonding *bond, int inc)
 644 {
 645         struct list_head *iter;
 646         int err = 0;
 647
 648         if (bond_uses_primary(bond)) {
 649                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 650
 651                 if (curr_active)
 652                         err = dev_set_promiscuity(curr_active->dev, inc);
 653         } else {
 654                 struct slave *slave;
 655
 656                 bond_for_each_slave(bond, slave, iter) {
 657                         err = dev_set_promiscuity(slave->dev, inc);
 658                         if (err)
 659                                 return err;
 660                 }
 661         }
 662         return err;
 663 }
 664
 665 /* Push the allmulti flag down to all slaves */
 666 static int bond_set_allmulti(struct bonding *bond, int inc)
 667 {
 668         struct list_head *iter;
 669         int err = 0;
 670
 671         if (bond_uses_primary(bond)) {
 672                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 673
 674                 if (curr_active)
 675                         err = dev_set_allmulti(curr_active->dev, inc);
 676         } else {
 677                 struct slave *slave;
 678
 679                 bond_for_each_slave(bond, slave, iter) {
 680                         err = dev_set_allmulti(slave->dev, inc);
 681                         if (err)
 682                                 return err;
 683                 }
 684         }
 685         return err;
 686 }
 687
 688 /* Retrieve the list of registered multicast addresses for the bonding
 689  * device and retransmit an IGMP JOIN request to the current active
 690  * slave.
 691  */
 692 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 693 {
 694         struct bonding *bond = container_of(work, struct bonding,
 695                                             mcast_work.work);
 696
 697         if (!rtnl_trylock()) {
 698                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 699                 return;
 700         }
 701         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 702
 703         if (bond->igmp_retrans > 1) {
 704                 bond->igmp_retrans--;
 705                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 706         }
 707         rtnl_unlock();
 708 }
 709
 710 /* Flush bond's hardware addresses from slave */
 711 static void bond_hw_addr_flush(struct net_device *bond_dev,
 712                                struct net_device *slave_dev)
 713 {
 714         struct bonding *bond = netdev_priv(bond_dev);
 715
 716         dev_uc_unsync(slave_dev, bond_dev);
 717         dev_mc_unsync(slave_dev, bond_dev);
 718
 719         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 720                 /* del lacpdu mc addr from mc list */
 721                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 722
 723                 dev_mc_del(slave_dev, lacpdu_multicast);
 724         }
 725 }
 726
 727 /*--------------------------- Active slave change ---------------------------*/
 728
 729 /* Update the hardware address list and promisc/allmulti for the new and
 730  * old active slaves (if any).  Modes that are not using primary keep all
 731  * slaves up date at all times; only the modes that use primary need to call
 732  * this function to swap these settings during a failover.
 733  */
 734 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 735                               struct slave *old_active)
 736 {
 737         if (old_active) {
 738                 if (bond->dev->flags & IFF_PROMISC)
 739                         dev_set_promiscuity(old_active->dev, -1);
 740
 741                 if (bond->dev->flags & IFF_ALLMULTI)
 742                         dev_set_allmulti(old_active->dev, -1);
 743
 744                 bond_hw_addr_flush(bond->dev, old_active->dev);
 745         }
 746
 747         if (new_active) {
 748                 /* FIXME: Signal errors upstream. */
 749                 if (bond->dev->flags & IFF_PROMISC)
 750                         dev_set_promiscuity(new_active->dev, 1);
 751
 752                 if (bond->dev->flags & IFF_ALLMULTI)
 753                         dev_set_allmulti(new_active->dev, 1);
 754
 755                 netif_addr_lock_bh(bond->dev);
 756                 dev_uc_sync(new_active->dev, bond->dev);
 757                 dev_mc_sync(new_active->dev, bond->dev);
 758                 netif_addr_unlock_bh(bond->dev);
 759         }
 760 }
 761
 762 /**
 763  * bond_set_dev_addr - clone slave's address to bond
 764  * @bond_dev: bond net device
 765  * @slave_dev: slave net device
 766  *
 767  * Should be called with RTNL held.
 768  */
 769 static int bond_set_dev_addr(struct net_device *bond_dev,
 770                              struct net_device *slave_dev)
 771 {
 772         int err;
 773
 774         slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 775                   bond_dev, slave_dev, slave_dev->addr_len);
 776         err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 777         if (err)
 778                 return err;
 779
 780         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 781         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 782         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 783         return 0;
 784 }
 785
 786 static struct slave *bond_get_old_active(struct bonding *bond,
 787                                          struct slave *new_active)
 788 {
 789         struct slave *slave;
 790         struct list_head *iter;
 791
 792         bond_for_each_slave(bond, slave, iter) {
 793                 if (slave == new_active)
 794                         continue;
 795
 796                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 797                         return slave;
 798         }
 799
 800         return NULL;
 801 }
 802
 803 /* bond_do_fail_over_mac
 804  *
 805  * Perform special MAC address swapping for fail_over_mac settings
 806  *
 807  * Called with RTNL
 808  */
 809 static void bond_do_fail_over_mac(struct bonding *bond,
 810                                   struct slave *new_active,
 811                                   struct slave *old_active)
 812 {
 813         u8 tmp_mac[MAX_ADDR_LEN];
 814         struct sockaddr_storage ss;
 815         int rv;
 816
 817         switch (bond->params.fail_over_mac) {
 818         case BOND_FOM_ACTIVE:
 819                 if (new_active) {
 820                         rv = bond_set_dev_addr(bond->dev, new_active->dev);
 821                         if (rv)
 822                                 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
 823                                           -rv);
 824                 }
 825                 break;
 826         case BOND_FOM_FOLLOW:
 827                 /* if new_active && old_active, swap them
 828                  * if just old_active, do nothing (going to no active slave)
 829                  * if just new_active, set new_active to bond's MAC
 830                  */
 831                 if (!new_active)
 832                         return;
 833
 834                 if (!old_active)
 835                         old_active = bond_get_old_active(bond, new_active);
 836
 837                 if (old_active) {
 838                         bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 839                                           new_active->dev->addr_len);
 840                         bond_hw_addr_copy(ss.__data,
 841                                           old_active->dev->dev_addr,
 842                                           old_active->dev->addr_len);
 843                         ss.ss_family = new_active->dev->type;
 844                 } else {
 845                         bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 846                                           bond->dev->addr_len);
 847                         ss.ss_family = bond->dev->type;
 848                 }
 849
 850                 rv = dev_set_mac_address(new_active->dev,
 851                                          (struct sockaddr *)&ss, NULL);
 852                 if (rv) {
 853                         slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
 854                                   -rv);
 855                         goto out;
 856                 }
 857
 858                 if (!old_active)
 859                         goto out;
 860
 861                 bond_hw_addr_copy(ss.__data, tmp_mac,
 862                                   new_active->dev->addr_len);
 863                 ss.ss_family = old_active->dev->type;
 864
 865                 rv = dev_set_mac_address(old_active->dev,
 866                                          (struct sockaddr *)&ss, NULL);
 867                 if (rv)
 868                         slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
 869                                   -rv);
 870 out:
 871                 break;
 872         default:
 873                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 874                            bond->params.fail_over_mac);
 875                 break;
 876         }
 877
 878 }
 879
 880 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
 881 {
 882         struct slave *prim = rtnl_dereference(bond->primary_slave);
 883         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 884
 885         if (!prim || prim->link != BOND_LINK_UP) {
 886                 if (!curr || curr->link != BOND_LINK_UP)
 887                         return NULL;
 888                 return curr;
 889         }
 890
 891         if (bond->force_primary) {
 892                 bond->force_primary = false;
 893                 return prim;
 894         }
 895
 896         if (!curr || curr->link != BOND_LINK_UP)
 897                 return prim;
 898
 899         /* At this point, prim and curr are both up */
 900         switch (bond->params.primary_reselect) {
 901         case BOND_PRI_RESELECT_ALWAYS:
 902                 return prim;
 903         case BOND_PRI_RESELECT_BETTER:
 904                 if (prim->speed < curr->speed)
 905                         return curr;
 906                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
 907                         return curr;
 908                 return prim;
 909         case BOND_PRI_RESELECT_FAILURE:
 910                 return curr;
 911         default:
 912                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
 913                            bond->params.primary_reselect);
 914                 return curr;
 915         }
 916 }
 917
 918 /**
 919  * bond_find_best_slave - select the best available slave to be the active one
 920  * @bond: our bonding struct
 921  */
 922 static struct slave *bond_find_best_slave(struct bonding *bond)
 923 {
 924         struct slave *slave, *bestslave = NULL;
 925         struct list_head *iter;
 926         int mintime = bond->params.updelay;
 927
 928         slave = bond_choose_primary_or_current(bond);
 929         if (slave)
 930                 return slave;
 931
 932         bond_for_each_slave(bond, slave, iter) {
 933                 if (slave->link == BOND_LINK_UP)
 934                         return slave;
 935                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 936                     slave->delay < mintime) {
 937                         mintime = slave->delay;
 938                         bestslave = slave;
 939                 }
 940         }
 941
 942         return bestslave;
 943 }
 944
 945 static bool bond_should_notify_peers(struct bonding *bond)
 946 {
 947         struct slave *slave;
 948
 949         rcu_read_lock();
 950         slave = rcu_dereference(bond->curr_active_slave);
 951         rcu_read_unlock();
 952
 953         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 954                    slave ? slave->dev->name : "NULL");
 955
 956         if (!slave || !bond->send_peer_notif ||
 957             bond->send_peer_notif %
 958             max(1, bond->params.peer_notif_delay) != 0 ||
 959             !netif_carrier_ok(bond->dev) ||
 960             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 961                 return false;
 962
 963         return true;
 964 }
 965
 966 /**
 967  * bond_change_active_slave - change the active slave into the specified one
 968  * @bond: our bonding struct
 969  * @new_active: the new slave to make the active one
 970  *
 971  * Set the new slave to the bond's settings and unset them on the old
 972  * curr_active_slave.
 973  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 974  *
 975  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 976  * because it is apparently the best available slave we have, even though its
 977  * updelay hasn't timed out yet.
 978  *
 979  * Caller must hold RTNL.
 980  */
 981 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 982 {
 983         struct slave *old_active;
 984
 985         ASSERT_RTNL();
 986
 987         old_active = rtnl_dereference(bond->curr_active_slave);
 988
 989         if (old_active == new_active)
 990                 return;
 991
 992 #ifdef CONFIG_XFRM_OFFLOAD
 993         if (old_active && bond->xs)
 994                 bond_ipsec_del_sa(bond->xs);
 995 #endif /* CONFIG_XFRM_OFFLOAD */
 996
 997         if (new_active) {
 998                 new_active->last_link_up = jiffies;
 999
1000                 if (new_active->link == BOND_LINK_BACK) {
1001                         if (bond_uses_primary(bond)) {
1002                                 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
1003                                            (bond->params.updelay - new_active->delay) * bond->params.miimon);
1004                         }
1005
1006                         new_active->delay = 0;
1007                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
1008                                                   BOND_SLAVE_NOTIFY_NOW);
1009
1010                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1011                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1012
1013                         if (bond_is_lb(bond))
1014                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1015                 } else {
1016                         if (bond_uses_primary(bond))
1017                                 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1018                 }
1019         }
1020
1021         if (bond_uses_primary(bond))
1022                 bond_hw_addr_swap(bond, new_active, old_active);
1023
1024         if (bond_is_lb(bond)) {
1025                 bond_alb_handle_active_change(bond, new_active);
1026                 if (old_active)
1027                         bond_set_slave_inactive_flags(old_active,
1028                                                       BOND_SLAVE_NOTIFY_NOW);
1029                 if (new_active)
1030                         bond_set_slave_active_flags(new_active,
1031                                                     BOND_SLAVE_NOTIFY_NOW);
1032         } else {
1033                 rcu_assign_pointer(bond->curr_active_slave, new_active);
1034         }
1035
1036         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1037                 if (old_active)
1038                         bond_set_slave_inactive_flags(old_active,
1039                                                       BOND_SLAVE_NOTIFY_NOW);
1040
1041                 if (new_active) {
1042                         bool should_notify_peers = false;
1043
1044                         bond_set_slave_active_flags(new_active,
1045                                                     BOND_SLAVE_NOTIFY_NOW);
1046
1047                         if (bond->params.fail_over_mac)
1048                                 bond_do_fail_over_mac(bond, new_active,
1049                                                       old_active);
1050
1051                         if (netif_running(bond->dev)) {
1052                                 bond->send_peer_notif =
1053                                         bond->params.num_peer_notif *
1054                                         max(1, bond->params.peer_notif_delay);
1055                                 should_notify_peers =
1056                                         bond_should_notify_peers(bond);
1057                         }
1058
1059                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1060                         if (should_notify_peers) {
1061                                 bond->send_peer_notif--;
1062                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1063                                                          bond->dev);
1064                         }
1065                 }
1066         }
1067
1068 #ifdef CONFIG_XFRM_OFFLOAD
1069         if (new_active && bond->xs) {
1070                 xfrm_dev_state_flush(dev_net(bond->dev), bond->dev, true);
1071                 bond_ipsec_add_sa(bond->xs);
1072         }
1073 #endif /* CONFIG_XFRM_OFFLOAD */
1074
1075         /* resend IGMP joins since active slave has changed or
1076          * all were sent on curr_active_slave.
1077          * resend only if bond is brought up with the affected
1078          * bonding modes and the retransmission is enabled
1079          */
1080         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1081             ((bond_uses_primary(bond) && new_active) ||
1082              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1083                 bond->igmp_retrans = bond->params.resend_igmp;
1084                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1085         }
1086 }
1087
1088 /**
1089  * bond_select_active_slave - select a new active slave, if needed
1090  * @bond: our bonding struct
1091  *
1092  * This functions should be called when one of the following occurs:
1093  * - The old curr_active_slave has been released or lost its link.
1094  * - The primary_slave has got its link back.
1095  * - A slave has got its link back and there's no old curr_active_slave.
1096  *
1097  * Caller must hold RTNL.
1098  */
1099 void bond_select_active_slave(struct bonding *bond)
1100 {
1101         struct slave *best_slave;
1102         int rv;
1103
1104         ASSERT_RTNL();
1105
1106         best_slave = bond_find_best_slave(bond);
1107         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1108                 bond_change_active_slave(bond, best_slave);
1109                 rv = bond_set_carrier(bond);
1110                 if (!rv)
1111                         return;
1112
1113                 if (netif_carrier_ok(bond->dev))
1114                         netdev_info(bond->dev, "active interface up!\n");
1115                 else
1116                         netdev_info(bond->dev, "now running without any active interface!\n");
1117         }
1118 }
1119
1120 #ifdef CONFIG_NET_POLL_CONTROLLER
1121 static inline int slave_enable_netpoll(struct slave *slave)
1122 {
1123         struct netpoll *np;
1124         int err = 0;
1125
1126         np = kzalloc(sizeof(*np), GFP_KERNEL);
1127         err = -ENOMEM;
1128         if (!np)
1129                 goto out;
1130
1131         err = __netpoll_setup(np, slave->dev);
1132         if (err) {
1133                 kfree(np);
1134                 goto out;
1135         }
1136         slave->np = np;
1137 out:
1138         return err;
1139 }
1140 static inline void slave_disable_netpoll(struct slave *slave)
1141 {
1142         struct netpoll *np = slave->np;
1143
1144         if (!np)
1145                 return;
1146
1147         slave->np = NULL;
1148
1149         __netpoll_free(np);
1150 }
1151
1152 static void bond_poll_controller(struct net_device *bond_dev)
1153 {
1154         struct bonding *bond = netdev_priv(bond_dev);
1155         struct slave *slave = NULL;
1156         struct list_head *iter;
1157         struct ad_info ad_info;
1158
1159         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1160                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
1161                         return;
1162
1163         bond_for_each_slave_rcu(bond, slave, iter) {
1164                 if (!bond_slave_is_up(slave))
1165                         continue;
1166
1167                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1168                         struct aggregator *agg =
1169                             SLAVE_AD_INFO(slave)->port.aggregator;
1170
1171                         if (agg &&
1172                             agg->aggregator_identifier != ad_info.aggregator_id)
1173                                 continue;
1174                 }
1175
1176                 netpoll_poll_dev(slave->dev);
1177         }
1178 }
1179
1180 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1181 {
1182         struct bonding *bond = netdev_priv(bond_dev);
1183         struct list_head *iter;
1184         struct slave *slave;
1185
1186         bond_for_each_slave(bond, slave, iter)
1187                 if (bond_slave_is_up(slave))
1188                         slave_disable_netpoll(slave);
1189 }
1190
1191 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1192 {
1193         struct bonding *bond = netdev_priv(dev);
1194         struct list_head *iter;
1195         struct slave *slave;
1196         int err = 0;
1197
1198         bond_for_each_slave(bond, slave, iter) {
1199                 err = slave_enable_netpoll(slave);
1200                 if (err) {
1201                         bond_netpoll_cleanup(dev);
1202                         break;
1203                 }
1204         }
1205         return err;
1206 }
1207 #else
1208 static inline int slave_enable_netpoll(struct slave *slave)
1209 {
1210         return 0;
1211 }
1212 static inline void slave_disable_netpoll(struct slave *slave)
1213 {
1214 }
1215 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1216 {
1217 }
1218 #endif
1219
1220 /*---------------------------------- IOCTL ----------------------------------*/
1221
1222 static netdev_features_t bond_fix_features(struct net_device *dev,
1223                                            netdev_features_t features)
1224 {
1225         struct bonding *bond = netdev_priv(dev);
1226         struct list_head *iter;
1227         netdev_features_t mask;
1228         struct slave *slave;
1229
1230 #if IS_ENABLED(CONFIG_TLS_DEVICE)
1231         if (bond_sk_check(bond))
1232                 features |= BOND_TLS_FEATURES;
1233         else
1234                 features &= ~BOND_TLS_FEATURES;
1235 #endif
1236
1237         mask = features;
1238
1239         features &= ~NETIF_F_ONE_FOR_ALL;
1240         features |= NETIF_F_ALL_FOR_ALL;
1241
1242         bond_for_each_slave(bond, slave, iter) {
1243                 features = netdev_increment_features(features,
1244                                                      slave->dev->features,
1245                                                      mask);
1246         }
1247         features = netdev_add_tso_features(features, mask);
1248
1249         return features;
1250 }
1251
1252 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1253                                  NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \
1254                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1255
1256 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1257                                  NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE)
1258
1259 #define BOND_MPLS_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1260                                  NETIF_F_GSO_SOFTWARE)
1261
1262
1263 static void bond_compute_features(struct bonding *bond)
1264 {
1265         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1266                                         IFF_XMIT_DST_RELEASE_PERM;
1267         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1268         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1269 #ifdef CONFIG_XFRM_OFFLOAD
1270         netdev_features_t xfrm_features  = BOND_XFRM_FEATURES;
1271 #endif /* CONFIG_XFRM_OFFLOAD */
1272         netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1273         struct net_device *bond_dev = bond->dev;
1274         struct list_head *iter;
1275         struct slave *slave;
1276         unsigned short max_hard_header_len = ETH_HLEN;
1277         unsigned int gso_max_size = GSO_MAX_SIZE;
1278         u16 gso_max_segs = GSO_MAX_SEGS;
1279
1280         if (!bond_has_slaves(bond))
1281                 goto done;
1282         vlan_features &= NETIF_F_ALL_FOR_ALL;
1283         mpls_features &= NETIF_F_ALL_FOR_ALL;
1284
1285         bond_for_each_slave(bond, slave, iter) {
1286                 vlan_features = netdev_increment_features(vlan_features,
1287                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1288
1289                 enc_features = netdev_increment_features(enc_features,
1290                                                          slave->dev->hw_enc_features,
1291                                                          BOND_ENC_FEATURES);
1292
1293 #ifdef CONFIG_XFRM_OFFLOAD
1294                 xfrm_features = netdev_increment_features(xfrm_features,
1295                                                           slave->dev->hw_enc_features,
1296                                                           BOND_XFRM_FEATURES);
1297 #endif /* CONFIG_XFRM_OFFLOAD */
1298
1299                 mpls_features = netdev_increment_features(mpls_features,
1300                                                           slave->dev->mpls_features,
1301                                                           BOND_MPLS_FEATURES);
1302
1303                 dst_release_flag &= slave->dev->priv_flags;
1304                 if (slave->dev->hard_header_len > max_hard_header_len)
1305                         max_hard_header_len = slave->dev->hard_header_len;
1306
1307                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1308                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1309         }
1310         bond_dev->hard_header_len = max_hard_header_len;
1311
1312 done:
1313         bond_dev->vlan_features = vlan_features;
1314         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1315                                     NETIF_F_HW_VLAN_CTAG_TX |
1316                                     NETIF_F_HW_VLAN_STAG_TX;
1317 #ifdef CONFIG_XFRM_OFFLOAD
1318         bond_dev->hw_enc_features |= xfrm_features;
1319 #endif /* CONFIG_XFRM_OFFLOAD */
1320         bond_dev->mpls_features = mpls_features;
1321         bond_dev->gso_max_segs = gso_max_segs;
1322         netif_set_gso_max_size(bond_dev, gso_max_size);
1323
1324         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1325         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1326             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1327                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1328
1329         netdev_change_features(bond_dev);
1330 }
1331
1332 static void bond_setup_by_slave(struct net_device *bond_dev,
1333                                 struct net_device *slave_dev)
1334 {
1335         bond_dev->header_ops        = slave_dev->header_ops;
1336
1337         bond_dev->type              = slave_dev->type;
1338         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1339         bond_dev->needed_headroom   = slave_dev->needed_headroom;
1340         bond_dev->addr_len          = slave_dev->addr_len;
1341
1342         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1343                 slave_dev->addr_len);
1344 }
1345
1346 /* On bonding slaves other than the currently active slave, suppress
1347  * duplicates except for alb non-mcast/bcast.
1348  */
1349 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1350                                             struct slave *slave,
1351                                             struct bonding *bond)
1352 {
1353         if (bond_is_slave_inactive(slave)) {
1354                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1355                     skb->pkt_type != PACKET_BROADCAST &&
1356                     skb->pkt_type != PACKET_MULTICAST)
1357                         return false;
1358                 return true;
1359         }
1360         return false;
1361 }
1362
1363 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1364 {
1365         struct sk_buff *skb = *pskb;
1366         struct slave *slave;
1367         struct bonding *bond;
1368         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1369                           struct slave *);
1370         int ret = RX_HANDLER_ANOTHER;
1371
1372         skb = skb_share_check(skb, GFP_ATOMIC);
1373         if (unlikely(!skb))
1374                 return RX_HANDLER_CONSUMED;
1375
1376         *pskb = skb;
1377
1378         slave = bond_slave_get_rcu(skb->dev);
1379         bond = slave->bond;
1380
1381         recv_probe = READ_ONCE(bond->recv_probe);
1382         if (recv_probe) {
1383                 ret = recv_probe(skb, bond, slave);
1384                 if (ret == RX_HANDLER_CONSUMED) {
1385                         consume_skb(skb);
1386                         return ret;
1387                 }
1388         }
1389
1390         /*
1391          * For packets determined by bond_should_deliver_exact_match() call to
1392          * be suppressed we want to make an exception for link-local packets.
1393          * This is necessary for e.g. LLDP daemons to be able to monitor
1394          * inactive slave links without being forced to bind to them
1395          * explicitly.
1396          *
1397          * At the same time, packets that are passed to the bonding master
1398          * (including link-local ones) can have their originating interface
1399          * determined via PACKET_ORIGDEV socket option.
1400          */
1401         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1402                 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1403                         return RX_HANDLER_PASS;
1404                 return RX_HANDLER_EXACT;
1405         }
1406
1407         skb->dev = bond->dev;
1408
1409         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1410             netif_is_bridge_port(bond->dev) &&
1411             skb->pkt_type == PACKET_HOST) {
1412
1413                 if (unlikely(skb_cow_head(skb,
1414                                           skb->data - skb_mac_header(skb)))) {
1415                         kfree_skb(skb);
1416                         return RX_HANDLER_CONSUMED;
1417                 }
1418                 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1419                                   bond->dev->addr_len);
1420         }
1421
1422         return ret;
1423 }
1424
1425 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1426 {
1427         switch (BOND_MODE(bond)) {
1428         case BOND_MODE_ROUNDROBIN:
1429                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1430         case BOND_MODE_ACTIVEBACKUP:
1431                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1432         case BOND_MODE_BROADCAST:
1433                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1434         case BOND_MODE_XOR:
1435         case BOND_MODE_8023AD:
1436                 return NETDEV_LAG_TX_TYPE_HASH;
1437         default:
1438                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1439         }
1440 }
1441
1442 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1443                                                enum netdev_lag_tx_type type)
1444 {
1445         if (type != NETDEV_LAG_TX_TYPE_HASH)
1446                 return NETDEV_LAG_HASH_NONE;
1447
1448         switch (bond->params.xmit_policy) {
1449         case BOND_XMIT_POLICY_LAYER2:
1450                 return NETDEV_LAG_HASH_L2;
1451         case BOND_XMIT_POLICY_LAYER34:
1452                 return NETDEV_LAG_HASH_L34;
1453         case BOND_XMIT_POLICY_LAYER23:
1454                 return NETDEV_LAG_HASH_L23;
1455         case BOND_XMIT_POLICY_ENCAP23:
1456                 return NETDEV_LAG_HASH_E23;
1457         case BOND_XMIT_POLICY_ENCAP34:
1458                 return NETDEV_LAG_HASH_E34;
1459         case BOND_XMIT_POLICY_VLAN_SRCMAC:
1460                 return NETDEV_LAG_HASH_VLAN_SRCMAC;
1461         default:
1462                 return NETDEV_LAG_HASH_UNKNOWN;
1463         }
1464 }
1465
1466 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1467                                       struct netlink_ext_ack *extack)
1468 {
1469         struct netdev_lag_upper_info lag_upper_info;
1470         enum netdev_lag_tx_type type;
1471
1472         type = bond_lag_tx_type(bond);
1473         lag_upper_info.tx_type = type;
1474         lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1475
1476         return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1477                                             &lag_upper_info, extack);
1478 }
1479
1480 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1481 {
1482         netdev_upper_dev_unlink(slave->dev, bond->dev);
1483         slave->dev->flags &= ~IFF_SLAVE;
1484 }
1485
1486 static void slave_kobj_release(struct kobject *kobj)
1487 {
1488         struct slave *slave = to_slave(kobj);
1489         struct bonding *bond = bond_get_bond_by_slave(slave);
1490
1491         cancel_delayed_work_sync(&slave->notify_work);
1492         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1493                 kfree(SLAVE_AD_INFO(slave));
1494
1495         kfree(slave);
1496 }
1497
1498 static struct kobj_type slave_ktype = {
1499         .release = slave_kobj_release,
1500 #ifdef CONFIG_SYSFS
1501         .sysfs_ops = &slave_sysfs_ops,
1502 #endif
1503 };
1504
1505 static int bond_kobj_init(struct slave *slave)
1506 {
1507         int err;
1508
1509         err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1510                                    &(slave->dev->dev.kobj), "bonding_slave");
1511         if (err)
1512                 kobject_put(&slave->kobj);
1513
1514         return err;
1515 }
1516
1517 static struct slave *bond_alloc_slave(struct bonding *bond,
1518                                       struct net_device *slave_dev)
1519 {
1520         struct slave *slave = NULL;
1521
1522         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1523         if (!slave)
1524                 return NULL;
1525
1526         slave->bond = bond;
1527         slave->dev = slave_dev;
1528         INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1529
1530         if (bond_kobj_init(slave))
1531                 return NULL;
1532
1533         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1534                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1535                                                GFP_KERNEL);
1536                 if (!SLAVE_AD_INFO(slave)) {
1537                         kobject_put(&slave->kobj);
1538                         return NULL;
1539                 }
1540         }
1541
1542         return slave;
1543 }
1544
1545 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1546 {
1547         info->bond_mode = BOND_MODE(bond);
1548         info->miimon = bond->params.miimon;
1549         info->num_slaves = bond->slave_cnt;
1550 }
1551
1552 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1553 {
1554         strcpy(info->slave_name, slave->dev->name);
1555         info->link = slave->link;
1556         info->state = bond_slave_state(slave);
1557         info->link_failure_count = slave->link_failure_count;
1558 }
1559
1560 static void bond_netdev_notify_work(struct work_struct *_work)
1561 {
1562         struct slave *slave = container_of(_work, struct slave,
1563                                            notify_work.work);
1564
1565         if (rtnl_trylock()) {
1566                 struct netdev_bonding_info binfo;
1567
1568                 bond_fill_ifslave(slave, &binfo.slave);
1569                 bond_fill_ifbond(slave->bond, &binfo.master);
1570                 netdev_bonding_info_change(slave->dev, &binfo);
1571                 rtnl_unlock();
1572         } else {
1573                 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1574         }
1575 }
1576
1577 void bond_queue_slave_event(struct slave *slave)
1578 {
1579         queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1580 }
1581
1582 void bond_lower_state_changed(struct slave *slave)
1583 {
1584         struct netdev_lag_lower_state_info info;
1585
1586         info.link_up = slave->link == BOND_LINK_UP ||
1587                        slave->link == BOND_LINK_FAIL;
1588         info.tx_enabled = bond_is_active_slave(slave);
1589         netdev_lower_state_changed(slave->dev, &info);
1590 }
1591
1592 /* enslave device <slave> to bond device <master> */
1593 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1594                  struct netlink_ext_ack *extack)
1595 {
1596         struct bonding *bond = netdev_priv(bond_dev);
1597         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1598         struct slave *new_slave = NULL, *prev_slave;
1599         struct sockaddr_storage ss;
1600         int link_reporting;
1601         int res = 0, i;
1602
1603         if (slave_dev->flags & IFF_MASTER &&
1604             !netif_is_bond_master(slave_dev)) {
1605                 NL_SET_ERR_MSG(extack, "Device with IFF_MASTER cannot be enslaved");
1606                 netdev_err(bond_dev,
1607                            "Error: Device with IFF_MASTER cannot be enslaved\n");
1608                 return -EPERM;
1609         }
1610
1611         if (!bond->params.use_carrier &&
1612             slave_dev->ethtool_ops->get_link == NULL &&
1613             slave_ops->ndo_do_ioctl == NULL) {
1614                 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1615         }
1616
1617         /* already in-use? */
1618         if (netdev_is_rx_handler_busy(slave_dev)) {
1619                 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1620                 slave_err(bond_dev, slave_dev,
1621                           "Error: Device is in use and cannot be enslaved\n");
1622                 return -EBUSY;
1623         }
1624
1625         if (bond_dev == slave_dev) {
1626                 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1627                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1628                 return -EPERM;
1629         }
1630
1631         /* vlan challenged mutual exclusion */
1632         /* no need to lock since we're protected by rtnl_lock */
1633         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1634                 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1635                 if (vlan_uses_dev(bond_dev)) {
1636                         NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1637                         slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1638                         return -EPERM;
1639                 } else {
1640                         slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1641                 }
1642         } else {
1643                 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1644         }
1645
1646         if (slave_dev->features & NETIF_F_HW_ESP)
1647                 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1648
1649         /* Old ifenslave binaries are no longer supported.  These can
1650          * be identified with moderate accuracy by the state of the slave:
1651          * the current ifenslave will set the interface down prior to
1652          * enslaving it; the old ifenslave will not.
1653          */
1654         if (slave_dev->flags & IFF_UP) {
1655                 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1656                 slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1657                 return -EPERM;
1658         }
1659
1660         /* set bonding device ether type by slave - bonding netdevices are
1661          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1662          * there is a need to override some of the type dependent attribs/funcs.
1663          *
1664          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1665          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1666          */
1667         if (!bond_has_slaves(bond)) {
1668                 if (bond_dev->type != slave_dev->type) {
1669                         slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1670                                   bond_dev->type, slave_dev->type);
1671
1672                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1673                                                        bond_dev);
1674                         res = notifier_to_errno(res);
1675                         if (res) {
1676                                 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1677                                 return -EBUSY;
1678                         }
1679
1680                         /* Flush unicast and multicast addresses */
1681                         dev_uc_flush(bond_dev);
1682                         dev_mc_flush(bond_dev);
1683
1684                         if (slave_dev->type != ARPHRD_ETHER)
1685                                 bond_setup_by_slave(bond_dev, slave_dev);
1686                         else {
1687                                 ether_setup(bond_dev);
1688                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1689                         }
1690
1691                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1692                                                  bond_dev);
1693                 }
1694         } else if (bond_dev->type != slave_dev->type) {
1695                 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1696                 slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1697                           slave_dev->type, bond_dev->type);
1698                 return -EINVAL;
1699         }
1700
1701         if (slave_dev->type == ARPHRD_INFINIBAND &&
1702             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1703                 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1704                 slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1705                            slave_dev->type);
1706                 res = -EOPNOTSUPP;
1707                 goto err_undo_flags;
1708         }
1709
1710         if (!slave_ops->ndo_set_mac_address ||
1711             slave_dev->type == ARPHRD_INFINIBAND) {
1712                 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1713                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1714                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1715                         if (!bond_has_slaves(bond)) {
1716                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1717                                 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1718                         } else {
1719                                 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1720                                 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");
1721                                 res = -EOPNOTSUPP;
1722                                 goto err_undo_flags;
1723                         }
1724                 }
1725         }
1726
1727         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1728
1729         /* If this is the first slave, then we need to set the master's hardware
1730          * address to be the same as the slave's.
1731          */
1732         if (!bond_has_slaves(bond) &&
1733             bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1734                 res = bond_set_dev_addr(bond->dev, slave_dev);
1735                 if (res)
1736                         goto err_undo_flags;
1737         }
1738
1739         new_slave = bond_alloc_slave(bond, slave_dev);
1740         if (!new_slave) {
1741                 res = -ENOMEM;
1742                 goto err_undo_flags;
1743         }
1744
1745         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1746          * is set via sysfs or module option if desired.
1747          */
1748         new_slave->queue_id = 0;
1749
1750         /* Save slave's original mtu and then set it to match the bond */
1751         new_slave->original_mtu = slave_dev->mtu;
1752         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1753         if (res) {
1754                 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1755                 goto err_free;
1756         }
1757
1758         /* Save slave's original ("permanent") mac address for modes
1759          * that need it, and for restoring it upon release, and then
1760          * set it to the master's address
1761          */
1762         bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1763                           slave_dev->addr_len);
1764
1765         if (!bond->params.fail_over_mac ||
1766             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1767                 /* Set slave to master's mac address.  The application already
1768                  * set the master's mac address to that of the first slave
1769                  */
1770                 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1771                 ss.ss_family = slave_dev->type;
1772                 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1773                                           extack);
1774                 if (res) {
1775                         slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1776                         goto err_restore_mtu;
1777                 }
1778         }
1779
1780         /* set slave flag before open to prevent IPv6 addrconf */
1781         slave_dev->flags |= IFF_SLAVE;
1782
1783         /* open the slave since the application closed it */
1784         res = dev_open(slave_dev, extack);
1785         if (res) {
1786                 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1787                 goto err_restore_mac;
1788         }
1789
1790         slave_dev->priv_flags |= IFF_BONDING;
1791         /* initialize slave stats */
1792         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1793
1794         if (bond_is_lb(bond)) {
1795                 /* bond_alb_init_slave() must be called before all other stages since
1796                  * it might fail and we do not want to have to undo everything
1797                  */
1798                 res = bond_alb_init_slave(bond, new_slave);
1799                 if (res)
1800                         goto err_close;
1801         }
1802
1803         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1804         if (res) {
1805                 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1806                 goto err_close;
1807         }
1808
1809         prev_slave = bond_last_slave(bond);
1810
1811         new_slave->delay = 0;
1812         new_slave->link_failure_count = 0;
1813
1814         if (bond_update_speed_duplex(new_slave) &&
1815             bond_needs_speed_duplex(bond))
1816                 new_slave->link = BOND_LINK_DOWN;
1817
1818         new_slave->last_rx = jiffies -
1819                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1820         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1821                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1822
1823         if (bond->params.miimon && !bond->params.use_carrier) {
1824                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1825
1826                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1827                         /* miimon is set but a bonded network driver
1828                          * does not support ETHTOOL/MII and
1829                          * arp_interval is not set.  Note: if
1830                          * use_carrier is enabled, we will never go
1831                          * here (because netif_carrier is always
1832                          * supported); thus, we don't need to change
1833                          * the messages for netif_carrier.
1834                          */
1835                         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");
1836                 } else if (link_reporting == -1) {
1837                         /* unable get link status using mii/ethtool */
1838                         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");
1839                 }
1840         }
1841
1842         /* check for initial state */
1843         new_slave->link = BOND_LINK_NOCHANGE;
1844         if (bond->params.miimon) {
1845                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1846                         if (bond->params.updelay) {
1847                                 bond_set_slave_link_state(new_slave,
1848                                                           BOND_LINK_BACK,
1849                                                           BOND_SLAVE_NOTIFY_NOW);
1850                                 new_slave->delay = bond->params.updelay;
1851                         } else {
1852                                 bond_set_slave_link_state(new_slave,
1853                                                           BOND_LINK_UP,
1854                                                           BOND_SLAVE_NOTIFY_NOW);
1855                         }
1856                 } else {
1857                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1858                                                   BOND_SLAVE_NOTIFY_NOW);
1859                 }
1860         } else if (bond->params.arp_interval) {
1861                 bond_set_slave_link_state(new_slave,
1862                                           (netif_carrier_ok(slave_dev) ?
1863                                           BOND_LINK_UP : BOND_LINK_DOWN),
1864                                           BOND_SLAVE_NOTIFY_NOW);
1865         } else {
1866                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1867                                           BOND_SLAVE_NOTIFY_NOW);
1868         }
1869
1870         if (new_slave->link != BOND_LINK_DOWN)
1871                 new_slave->last_link_up = jiffies;
1872         slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1873                   new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1874                   (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1875
1876         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1877                 /* if there is a primary slave, remember it */
1878                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1879                         rcu_assign_pointer(bond->primary_slave, new_slave);
1880                         bond->force_primary = true;
1881                 }
1882         }
1883
1884         switch (BOND_MODE(bond)) {
1885         case BOND_MODE_ACTIVEBACKUP:
1886                 bond_set_slave_inactive_flags(new_slave,
1887                                               BOND_SLAVE_NOTIFY_NOW);
1888                 break;
1889         case BOND_MODE_8023AD:
1890                 /* in 802.3ad mode, the internal mechanism
1891                  * will activate the slaves in the selected
1892                  * aggregator
1893                  */
1894                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1895                 /* if this is the first slave */
1896                 if (!prev_slave) {
1897                         SLAVE_AD_INFO(new_slave)->id = 1;
1898                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1899                          * can be called only after the mac address of the bond is set
1900                          */
1901                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1902                 } else {
1903                         SLAVE_AD_INFO(new_slave)->id =
1904                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1905                 }
1906
1907                 bond_3ad_bind_slave(new_slave);
1908                 break;
1909         case BOND_MODE_TLB:
1910         case BOND_MODE_ALB:
1911                 bond_set_active_slave(new_slave);
1912                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1913                 break;
1914         default:
1915                 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1916
1917                 /* always active in trunk mode */
1918                 bond_set_active_slave(new_slave);
1919
1920                 /* In trunking mode there is little meaning to curr_active_slave
1921                  * anyway (it holds no special properties of the bond device),
1922                  * so we can change it without calling change_active_interface()
1923                  */
1924                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1925                     new_slave->link == BOND_LINK_UP)
1926                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1927
1928                 break;
1929         } /* switch(bond_mode) */
1930
1931 #ifdef CONFIG_NET_POLL_CONTROLLER
1932         if (bond->dev->npinfo) {
1933                 if (slave_enable_netpoll(new_slave)) {
1934                         slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1935                         res = -EBUSY;
1936                         goto err_detach;
1937                 }
1938         }
1939 #endif
1940
1941         if (!(bond_dev->features & NETIF_F_LRO))
1942                 dev_disable_lro(slave_dev);
1943
1944         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1945                                          new_slave);
1946         if (res) {
1947                 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1948                 goto err_detach;
1949         }
1950
1951         res = bond_master_upper_dev_link(bond, new_slave, extack);
1952         if (res) {
1953                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1954                 goto err_unregister;
1955         }
1956
1957         bond_lower_state_changed(new_slave);
1958
1959         res = bond_sysfs_slave_add(new_slave);
1960         if (res) {
1961                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1962                 goto err_upper_unlink;
1963         }
1964
1965         /* If the mode uses primary, then the following is handled by
1966          * bond_change_active_slave().
1967          */
1968         if (!bond_uses_primary(bond)) {
1969                 /* set promiscuity level to new slave */
1970                 if (bond_dev->flags & IFF_PROMISC) {
1971                         res = dev_set_promiscuity(slave_dev, 1);
1972                         if (res)
1973                                 goto err_sysfs_del;
1974                 }
1975
1976                 /* set allmulti level to new slave */
1977                 if (bond_dev->flags & IFF_ALLMULTI) {
1978                         res = dev_set_allmulti(slave_dev, 1);
1979                         if (res) {
1980                                 if (bond_dev->flags & IFF_PROMISC)
1981                                         dev_set_promiscuity(slave_dev, -1);
1982                                 goto err_sysfs_del;
1983                         }
1984                 }
1985
1986                 netif_addr_lock_bh(bond_dev);
1987                 dev_mc_sync_multiple(slave_dev, bond_dev);
1988                 dev_uc_sync_multiple(slave_dev, bond_dev);
1989                 netif_addr_unlock_bh(bond_dev);
1990
1991                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1992                         /* add lacpdu mc addr to mc list */
1993                         u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1994
1995                         dev_mc_add(slave_dev, lacpdu_multicast);
1996                 }
1997         }
1998
1999         bond->slave_cnt++;
2000         bond_compute_features(bond);
2001         bond_set_carrier(bond);
2002
2003         if (bond_uses_primary(bond)) {
2004                 block_netpoll_tx();
2005                 bond_select_active_slave(bond);
2006                 unblock_netpoll_tx();
2007         }
2008
2009         if (bond_mode_can_use_xmit_hash(bond))
2010                 bond_update_slave_arr(bond, NULL);
2011
2012
2013         slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
2014                    bond_is_active_slave(new_slave) ? "an active" : "a backup",
2015                    new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
2016
2017         /* enslave is successful */
2018         bond_queue_slave_event(new_slave);
2019         return 0;
2020
2021 /* Undo stages on error */
2022 err_sysfs_del:
2023         bond_sysfs_slave_del(new_slave);
2024
2025 err_upper_unlink:
2026         bond_upper_dev_unlink(bond, new_slave);
2027
2028 err_unregister:
2029         netdev_rx_handler_unregister(slave_dev);
2030
2031 err_detach:
2032         vlan_vids_del_by_dev(slave_dev, bond_dev);
2033         if (rcu_access_pointer(bond->primary_slave) == new_slave)
2034                 RCU_INIT_POINTER(bond->primary_slave, NULL);
2035         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
2036                 block_netpoll_tx();
2037                 bond_change_active_slave(bond, NULL);
2038                 bond_select_active_slave(bond);
2039                 unblock_netpoll_tx();
2040         }
2041         /* either primary_slave or curr_active_slave might've changed */
2042         synchronize_rcu();
2043         slave_disable_netpoll(new_slave);
2044
2045 err_close:
2046         if (!netif_is_bond_master(slave_dev))
2047                 slave_dev->priv_flags &= ~IFF_BONDING;
2048         dev_close(slave_dev);
2049
2050 err_restore_mac:
2051         slave_dev->flags &= ~IFF_SLAVE;
2052         if (!bond->params.fail_over_mac ||
2053             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2054                 /* XXX TODO - fom follow mode needs to change master's
2055                  * MAC if this slave's MAC is in use by the bond, or at
2056                  * least print a warning.
2057                  */
2058                 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2059                                   new_slave->dev->addr_len);
2060                 ss.ss_family = slave_dev->type;
2061                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2062         }
2063
2064 err_restore_mtu:
2065         dev_set_mtu(slave_dev, new_slave->original_mtu);
2066
2067 err_free:
2068         kobject_put(&new_slave->kobj);
2069
2070 err_undo_flags:
2071         /* Enslave of first slave has failed and we need to fix master's mac */
2072         if (!bond_has_slaves(bond)) {
2073                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
2074                                             slave_dev->dev_addr))
2075                         eth_hw_addr_random(bond_dev);
2076                 if (bond_dev->type != ARPHRD_ETHER) {
2077                         dev_close(bond_dev);
2078                         ether_setup(bond_dev);
2079                         bond_dev->flags |= IFF_MASTER;
2080                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2081                 }
2082         }
2083
2084         return res;
2085 }
2086
2087 /* Try to release the slave device <slave> from the bond device <master>
2088  * It is legal to access curr_active_slave without a lock because all the function
2089  * is RTNL-locked. If "all" is true it means that the function is being called
2090  * while destroying a bond interface and all slaves are being released.
2091  *
2092  * The rules for slave state should be:
2093  *   for Active/Backup:
2094  *     Active stays on all backups go down
2095  *   for Bonded connections:
2096  *     The first up interface should be left on and all others downed.
2097  */
2098 static int __bond_release_one(struct net_device *bond_dev,
2099                               struct net_device *slave_dev,
2100                               bool all, bool unregister)
2101 {
2102         struct bonding *bond = netdev_priv(bond_dev);
2103         struct slave *slave, *oldcurrent;
2104         struct sockaddr_storage ss;
2105         int old_flags = bond_dev->flags;
2106         netdev_features_t old_features = bond_dev->features;
2107
2108         /* slave is not a slave or master is not master of this slave */
2109         if (!(slave_dev->flags & IFF_SLAVE) ||
2110             !netdev_has_upper_dev(slave_dev, bond_dev)) {
2111                 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2112                 return -EINVAL;
2113         }
2114
2115         block_netpoll_tx();
2116
2117         slave = bond_get_slave_by_dev(bond, slave_dev);
2118         if (!slave) {
2119                 /* not a slave of this bond */
2120                 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2121                 unblock_netpoll_tx();
2122                 return -EINVAL;
2123         }
2124
2125         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2126
2127         bond_sysfs_slave_del(slave);
2128
2129         /* recompute stats just before removing the slave */
2130         bond_get_stats(bond->dev, &bond->bond_stats);
2131
2132         bond_upper_dev_unlink(bond, slave);
2133         /* unregister rx_handler early so bond_handle_frame wouldn't be called
2134          * for this slave anymore.
2135          */
2136         netdev_rx_handler_unregister(slave_dev);
2137
2138         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2139                 bond_3ad_unbind_slave(slave);
2140
2141         if (bond_mode_can_use_xmit_hash(bond))
2142                 bond_update_slave_arr(bond, slave);
2143
2144         slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2145                     bond_is_active_slave(slave) ? "active" : "backup");
2146
2147         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2148
2149         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2150
2151         if (!all && (!bond->params.fail_over_mac ||
2152                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2153                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2154                     bond_has_slaves(bond))
2155                         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",
2156                                    slave->perm_hwaddr);
2157         }
2158
2159         if (rtnl_dereference(bond->primary_slave) == slave)
2160                 RCU_INIT_POINTER(bond->primary_slave, NULL);
2161
2162         if (oldcurrent == slave)
2163                 bond_change_active_slave(bond, NULL);
2164
2165         if (bond_is_lb(bond)) {
2166                 /* Must be called only after the slave has been
2167                  * detached from the list and the curr_active_slave
2168                  * has been cleared (if our_slave == old_current),
2169                  * but before a new active slave is selected.
2170                  */
2171                 bond_alb_deinit_slave(bond, slave);
2172         }
2173
2174         if (all) {
2175                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2176         } else if (oldcurrent == slave) {
2177                 /* Note that we hold RTNL over this sequence, so there
2178                  * is no concern that another slave add/remove event
2179                  * will interfere.
2180                  */
2181                 bond_select_active_slave(bond);
2182         }
2183
2184         if (!bond_has_slaves(bond)) {
2185                 bond_set_carrier(bond);
2186                 eth_hw_addr_random(bond_dev);
2187         }
2188
2189         unblock_netpoll_tx();
2190         synchronize_rcu();
2191         bond->slave_cnt--;
2192
2193         if (!bond_has_slaves(bond)) {
2194                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2195                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2196         }
2197
2198         bond_compute_features(bond);
2199         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2200             (old_features & NETIF_F_VLAN_CHALLENGED))
2201                 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2202
2203         vlan_vids_del_by_dev(slave_dev, bond_dev);
2204
2205         /* If the mode uses primary, then this case was handled above by
2206          * bond_change_active_slave(..., NULL)
2207          */
2208         if (!bond_uses_primary(bond)) {
2209                 /* unset promiscuity level from slave
2210                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
2211                  * of the IFF_PROMISC flag in the bond_dev, but we need the
2212                  * value of that flag before that change, as that was the value
2213                  * when this slave was attached, so we cache at the start of the
2214                  * function and use it here. Same goes for ALLMULTI below
2215                  */
2216                 if (old_flags & IFF_PROMISC)
2217                         dev_set_promiscuity(slave_dev, -1);
2218
2219                 /* unset allmulti level from slave */
2220                 if (old_flags & IFF_ALLMULTI)
2221                         dev_set_allmulti(slave_dev, -1);
2222
2223                 bond_hw_addr_flush(bond_dev, slave_dev);
2224         }
2225
2226         slave_disable_netpoll(slave);
2227
2228         /* close slave before restoring its mac address */
2229         dev_close(slave_dev);
2230
2231         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2232             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2233                 /* restore original ("permanent") mac address */
2234                 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2235                                   slave->dev->addr_len);
2236                 ss.ss_family = slave_dev->type;
2237                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2238         }
2239
2240         if (unregister)
2241                 __dev_set_mtu(slave_dev, slave->original_mtu);
2242         else
2243                 dev_set_mtu(slave_dev, slave->original_mtu);
2244
2245         if (!netif_is_bond_master(slave_dev))
2246                 slave_dev->priv_flags &= ~IFF_BONDING;
2247
2248         kobject_put(&slave->kobj);
2249
2250         return 0;
2251 }
2252
2253 /* A wrapper used because of ndo_del_link */
2254 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2255 {
2256         return __bond_release_one(bond_dev, slave_dev, false, false);
2257 }
2258
2259 /* First release a slave and then destroy the bond if no more slaves are left.
2260  * Must be under rtnl_lock when this function is called.
2261  */
2262 static int bond_release_and_destroy(struct net_device *bond_dev,
2263                                     struct net_device *slave_dev)
2264 {
2265         struct bonding *bond = netdev_priv(bond_dev);
2266         int ret;
2267
2268         ret = __bond_release_one(bond_dev, slave_dev, false, true);
2269         if (ret == 0 && !bond_has_slaves(bond) &&
2270             bond_dev->reg_state != NETREG_UNREGISTERING) {
2271                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2272                 netdev_info(bond_dev, "Destroying bond\n");
2273                 bond_remove_proc_entry(bond);
2274                 unregister_netdevice(bond_dev);
2275         }
2276         return ret;
2277 }
2278
2279 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2280 {
2281         struct bonding *bond = netdev_priv(bond_dev);
2282
2283         bond_fill_ifbond(bond, info);
2284 }
2285
2286 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2287 {
2288         struct bonding *bond = netdev_priv(bond_dev);
2289         struct list_head *iter;
2290         int i = 0, res = -ENODEV;
2291         struct slave *slave;
2292
2293         bond_for_each_slave(bond, slave, iter) {
2294                 if (i++ == (int)info->slave_id) {
2295                         res = 0;
2296                         bond_fill_ifslave(slave, info);
2297                         break;
2298                 }
2299         }
2300
2301         return res;
2302 }
2303
2304 /*-------------------------------- Monitoring -------------------------------*/
2305
2306 /* called with rcu_read_lock() */
2307 static int bond_miimon_inspect(struct bonding *bond)
2308 {
2309         int link_state, commit = 0;
2310         struct list_head *iter;
2311         struct slave *slave;
2312         bool ignore_updelay;
2313
2314         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2315
2316         bond_for_each_slave_rcu(bond, slave, iter) {
2317                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2318
2319                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2320
2321                 switch (slave->link) {
2322                 case BOND_LINK_UP:
2323                         if (link_state)
2324                                 continue;
2325
2326                         bond_propose_link_state(slave, BOND_LINK_FAIL);
2327                         commit++;
2328                         slave->delay = bond->params.downdelay;
2329                         if (slave->delay) {
2330                                 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2331                                            (BOND_MODE(bond) ==
2332                                             BOND_MODE_ACTIVEBACKUP) ?
2333                                             (bond_is_active_slave(slave) ?
2334                                              "active " : "backup ") : "",
2335                                            bond->params.downdelay * bond->params.miimon);
2336                         }
2337                         fallthrough;
2338                 case BOND_LINK_FAIL:
2339                         if (link_state) {
2340                                 /* recovered before downdelay expired */
2341                                 bond_propose_link_state(slave, BOND_LINK_UP);
2342                                 slave->last_link_up = jiffies;
2343                                 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2344                                            (bond->params.downdelay - slave->delay) *
2345                                            bond->params.miimon);
2346                                 commit++;
2347                                 continue;
2348                         }
2349
2350                         if (slave->delay <= 0) {
2351                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2352                                 commit++;
2353                                 continue;
2354                         }
2355
2356                         slave->delay--;
2357                         break;
2358
2359                 case BOND_LINK_DOWN:
2360                         if (!link_state)
2361                                 continue;
2362
2363                         bond_propose_link_state(slave, BOND_LINK_BACK);
2364                         commit++;
2365                         slave->delay = bond->params.updelay;
2366
2367                         if (slave->delay) {
2368                                 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2369                                            ignore_updelay ? 0 :
2370                                            bond->params.updelay *
2371                                            bond->params.miimon);
2372                         }
2373                         fallthrough;
2374                 case BOND_LINK_BACK:
2375                         if (!link_state) {
2376                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2377                                 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2378                                            (bond->params.updelay - slave->delay) *
2379                                            bond->params.miimon);
2380                                 commit++;
2381                                 continue;
2382                         }
2383
2384                         if (ignore_updelay)
2385                                 slave->delay = 0;
2386
2387                         if (slave->delay <= 0) {
2388                                 bond_propose_link_state(slave, BOND_LINK_UP);
2389                                 commit++;
2390                                 ignore_updelay = false;
2391                                 continue;
2392                         }
2393
2394                         slave->delay--;
2395                         break;
2396                 }
2397         }
2398
2399         return commit;
2400 }
2401
2402 static void bond_miimon_link_change(struct bonding *bond,
2403                                     struct slave *slave,
2404                                     char link)
2405 {
2406         switch (BOND_MODE(bond)) {
2407         case BOND_MODE_8023AD:
2408                 bond_3ad_handle_link_change(slave, link);
2409                 break;
2410         case BOND_MODE_TLB:
2411         case BOND_MODE_ALB:
2412                 bond_alb_handle_link_change(bond, slave, link);
2413                 break;
2414         case BOND_MODE_XOR:
2415                 bond_update_slave_arr(bond, NULL);
2416                 break;
2417         }
2418 }
2419
2420 static void bond_miimon_commit(struct bonding *bond)
2421 {
2422         struct list_head *iter;
2423         struct slave *slave, *primary;
2424
2425         bond_for_each_slave(bond, slave, iter) {
2426                 switch (slave->link_new_state) {
2427                 case BOND_LINK_NOCHANGE:
2428                         /* For 802.3ad mode, check current slave speed and
2429                          * duplex again in case its port was disabled after
2430                          * invalid speed/duplex reporting but recovered before
2431                          * link monitoring could make a decision on the actual
2432                          * link status
2433                          */
2434                         if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2435                             slave->link == BOND_LINK_UP)
2436                                 bond_3ad_adapter_speed_duplex_changed(slave);
2437                         continue;
2438
2439                 case BOND_LINK_UP:
2440                         if (bond_update_speed_duplex(slave) &&
2441                             bond_needs_speed_duplex(bond)) {
2442                                 slave->link = BOND_LINK_DOWN;
2443                                 if (net_ratelimit())
2444                                         slave_warn(bond->dev, slave->dev,
2445                                                    "failed to get link speed/duplex\n");
2446                                 continue;
2447                         }
2448                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2449                                                   BOND_SLAVE_NOTIFY_NOW);
2450                         slave->last_link_up = jiffies;
2451
2452                         primary = rtnl_dereference(bond->primary_slave);
2453                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2454                                 /* prevent it from being the active one */
2455                                 bond_set_backup_slave(slave);
2456                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2457                                 /* make it immediately active */
2458                                 bond_set_active_slave(slave);
2459                         }
2460
2461                         slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2462                                    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2463                                    slave->duplex ? "full" : "half");
2464
2465                         bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2466
2467                         if (!bond->curr_active_slave || slave == primary)
2468                                 goto do_failover;
2469
2470                         continue;
2471
2472                 case BOND_LINK_DOWN:
2473                         if (slave->link_failure_count < UINT_MAX)
2474                                 slave->link_failure_count++;
2475
2476                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2477                                                   BOND_SLAVE_NOTIFY_NOW);
2478
2479                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2480                             BOND_MODE(bond) == BOND_MODE_8023AD)
2481                                 bond_set_slave_inactive_flags(slave,
2482                                                               BOND_SLAVE_NOTIFY_NOW);
2483
2484                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2485
2486                         bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2487
2488                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2489                                 goto do_failover;
2490
2491                         continue;
2492
2493                 default:
2494                         slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2495                                   slave->link_new_state);
2496                         bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2497
2498                         continue;
2499                 }
2500
2501 do_failover:
2502                 block_netpoll_tx();
2503                 bond_select_active_slave(bond);
2504                 unblock_netpoll_tx();
2505         }
2506
2507         bond_set_carrier(bond);
2508 }
2509
2510 /* bond_mii_monitor
2511  *
2512  * Really a wrapper that splits the mii monitor into two phases: an
2513  * inspection, then (if inspection indicates something needs to be done)
2514  * an acquisition of appropriate locks followed by a commit phase to
2515  * implement whatever link state changes are indicated.
2516  */
2517 static void bond_mii_monitor(struct work_struct *work)
2518 {
2519         struct bonding *bond = container_of(work, struct bonding,
2520                                             mii_work.work);
2521         bool should_notify_peers = false;
2522         bool commit;
2523         unsigned long delay;
2524         struct slave *slave;
2525         struct list_head *iter;
2526
2527         delay = msecs_to_jiffies(bond->params.miimon);
2528
2529         if (!bond_has_slaves(bond))
2530                 goto re_arm;
2531
2532         rcu_read_lock();
2533         should_notify_peers = bond_should_notify_peers(bond);
2534         commit = !!bond_miimon_inspect(bond);
2535         if (bond->send_peer_notif) {
2536                 rcu_read_unlock();
2537                 if (rtnl_trylock()) {
2538                         bond->send_peer_notif--;
2539                         rtnl_unlock();
2540                 }
2541         } else {
2542                 rcu_read_unlock();
2543         }
2544
2545         if (commit) {
2546                 /* Race avoidance with bond_close cancel of workqueue */
2547                 if (!rtnl_trylock()) {
2548                         delay = 1;
2549                         should_notify_peers = false;
2550                         goto re_arm;
2551                 }
2552
2553                 bond_for_each_slave(bond, slave, iter) {
2554                         bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2555                 }
2556                 bond_miimon_commit(bond);
2557
2558                 rtnl_unlock();  /* might sleep, hold no other locks */
2559         }
2560
2561 re_arm:
2562         if (bond->params.miimon)
2563                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2564
2565         if (should_notify_peers) {
2566                 if (!rtnl_trylock())
2567                         return;
2568                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2569                 rtnl_unlock();
2570         }
2571 }
2572
2573 static int bond_upper_dev_walk(struct net_device *upper,
2574                                struct netdev_nested_priv *priv)
2575 {
2576         __be32 ip = *(__be32 *)priv->data;
2577
2578         return ip == bond_confirm_addr(upper, 0, ip);
2579 }
2580
2581 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2582 {
2583         struct netdev_nested_priv priv = {
2584                 .data = (void *)&ip,
2585         };
2586         bool ret = false;
2587
2588         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2589                 return true;
2590
2591         rcu_read_lock();
2592         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
2593                 ret = true;
2594         rcu_read_unlock();
2595
2596         return ret;
2597 }
2598
2599 /* We go to the (large) trouble of VLAN tagging ARP frames because
2600  * switches in VLAN mode (especially if ports are configured as
2601  * "native" to a VLAN) might not pass non-tagged frames.
2602  */
2603 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2604                           __be32 src_ip, struct bond_vlan_tag *tags)
2605 {
2606         struct sk_buff *skb;
2607         struct bond_vlan_tag *outer_tag = tags;
2608         struct net_device *slave_dev = slave->dev;
2609         struct net_device *bond_dev = slave->bond->dev;
2610
2611         slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2612                   arp_op, &dest_ip, &src_ip);
2613
2614         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2615                          NULL, slave_dev->dev_addr, NULL);
2616
2617         if (!skb) {
2618                 net_err_ratelimited("ARP packet allocation failed\n");
2619                 return;
2620         }
2621
2622         if (!tags || tags->vlan_proto == VLAN_N_VID)
2623                 goto xmit;
2624
2625         tags++;
2626
2627         /* Go through all the tags backwards and add them to the packet */
2628         while (tags->vlan_proto != VLAN_N_VID) {
2629                 if (!tags->vlan_id) {
2630                         tags++;
2631                         continue;
2632                 }
2633
2634                 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2635                           ntohs(outer_tag->vlan_proto), tags->vlan_id);
2636                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2637                                                 tags->vlan_id);
2638                 if (!skb) {
2639                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2640                         return;
2641                 }
2642
2643                 tags++;
2644         }
2645         /* Set the outer tag */
2646         if (outer_tag->vlan_id) {
2647                 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2648                           ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2649                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2650                                        outer_tag->vlan_id);
2651         }
2652
2653 xmit:
2654         arp_xmit(skb);
2655 }
2656
2657 /* Validate the device path between the @start_dev and the @end_dev.
2658  * The path is valid if the @end_dev is reachable through device
2659  * stacking.
2660  * When the path is validated, collect any vlan information in the
2661  * path.
2662  */
2663 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2664                                               struct net_device *end_dev,
2665                                               int level)
2666 {
2667         struct bond_vlan_tag *tags;
2668         struct net_device *upper;
2669         struct list_head  *iter;
2670
2671         if (start_dev == end_dev) {
2672                 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2673                 if (!tags)
2674                         return ERR_PTR(-ENOMEM);
2675                 tags[level].vlan_proto = VLAN_N_VID;
2676                 return tags;
2677         }
2678
2679         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2680                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2681                 if (IS_ERR_OR_NULL(tags)) {
2682                         if (IS_ERR(tags))
2683                                 return tags;
2684                         continue;
2685                 }
2686                 if (is_vlan_dev(upper)) {
2687                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2688                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2689                 }
2690
2691                 return tags;
2692         }
2693
2694         return NULL;
2695 }
2696
2697 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2698 {
2699         struct rtable *rt;
2700         struct bond_vlan_tag *tags;
2701         __be32 *targets = bond->params.arp_targets, addr;
2702         int i;
2703
2704         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2705                 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2706                           __func__, &targets[i]);
2707                 tags = NULL;
2708
2709                 /* Find out through which dev should the packet go */
2710                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2711                                      RTO_ONLINK, 0);
2712                 if (IS_ERR(rt)) {
2713                         /* there's no route to target - try to send arp
2714                          * probe to generate any traffic (arp_validate=0)
2715                          */
2716                         if (bond->params.arp_validate)
2717                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2718                                                      bond->dev->name,
2719                                                      &targets[i]);
2720                         bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2721                                       0, tags);
2722                         continue;
2723                 }
2724
2725                 /* bond device itself */
2726                 if (rt->dst.dev == bond->dev)
2727                         goto found;
2728
2729                 rcu_read_lock();
2730                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2731                 rcu_read_unlock();
2732
2733                 if (!IS_ERR_OR_NULL(tags))
2734                         goto found;
2735
2736                 /* Not our device - skip */
2737                 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2738                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2739
2740                 ip_rt_put(rt);
2741                 continue;
2742
2743 found:
2744                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2745                 ip_rt_put(rt);
2746                 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2747                 kfree(tags);
2748         }
2749 }
2750
2751 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2752 {
2753         int i;
2754
2755         if (!sip || !bond_has_this_ip(bond, tip)) {
2756                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2757                            __func__, &sip, &tip);
2758                 return;
2759         }
2760
2761         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2762         if (i == -1) {
2763                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2764                            __func__, &sip);
2765                 return;
2766         }
2767         slave->last_rx = jiffies;
2768         slave->target_last_arp_rx[i] = jiffies;
2769 }
2770
2771 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2772                  struct slave *slave)
2773 {
2774         struct arphdr *arp = (struct arphdr *)skb->data;
2775         struct slave *curr_active_slave, *curr_arp_slave;
2776         unsigned char *arp_ptr;
2777         __be32 sip, tip;
2778         int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2779         unsigned int alen;
2780
2781         if (!slave_do_arp_validate(bond, slave)) {
2782                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2783                     !slave_do_arp_validate_only(bond))
2784                         slave->last_rx = jiffies;
2785                 return RX_HANDLER_ANOTHER;
2786         } else if (!is_arp) {
2787                 return RX_HANDLER_ANOTHER;
2788         }
2789
2790         alen = arp_hdr_len(bond->dev);
2791
2792         slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2793                    __func__, skb->dev->name);
2794
2795         if (alen > skb_headlen(skb)) {
2796                 arp = kmalloc(alen, GFP_ATOMIC);
2797                 if (!arp)
2798                         goto out_unlock;
2799                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2800                         goto out_unlock;
2801         }
2802
2803         if (arp->ar_hln != bond->dev->addr_len ||
2804             skb->pkt_type == PACKET_OTHERHOST ||
2805             skb->pkt_type == PACKET_LOOPBACK ||
2806             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2807             arp->ar_pro != htons(ETH_P_IP) ||
2808             arp->ar_pln != 4)
2809                 goto out_unlock;
2810
2811         arp_ptr = (unsigned char *)(arp + 1);
2812         arp_ptr += bond->dev->addr_len;
2813         memcpy(&sip, arp_ptr, 4);
2814         arp_ptr += 4 + bond->dev->addr_len;
2815         memcpy(&tip, arp_ptr, 4);
2816
2817         slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2818                   __func__, slave->dev->name, bond_slave_state(slave),
2819                   bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2820                   &sip, &tip);
2821
2822         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2823         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2824
2825         /* We 'trust' the received ARP enough to validate it if:
2826          *
2827          * (a) the slave receiving the ARP is active (which includes the
2828          * current ARP slave, if any), or
2829          *
2830          * (b) the receiving slave isn't active, but there is a currently
2831          * active slave and it received valid arp reply(s) after it became
2832          * the currently active slave, or
2833          *
2834          * (c) there is an ARP slave that sent an ARP during the prior ARP
2835          * interval, and we receive an ARP reply on any slave.  We accept
2836          * these because switch FDB update delays may deliver the ARP
2837          * reply to a slave other than the sender of the ARP request.
2838          *
2839          * Note: for (b), backup slaves are receiving the broadcast ARP
2840          * request, not a reply.  This request passes from the sending
2841          * slave through the L2 switch(es) to the receiving slave.  Since
2842          * this is checking the request, sip/tip are swapped for
2843          * validation.
2844          *
2845          * This is done to avoid endless looping when we can't reach the
2846          * arp_ip_target and fool ourselves with our own arp requests.
2847          */
2848         if (bond_is_active_slave(slave))
2849                 bond_validate_arp(bond, slave, sip, tip);
2850         else if (curr_active_slave &&
2851                  time_after(slave_last_rx(bond, curr_active_slave),
2852                             curr_active_slave->last_link_up))
2853                 bond_validate_arp(bond, slave, tip, sip);
2854         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2855                  bond_time_in_interval(bond,
2856                                        dev_trans_start(curr_arp_slave->dev), 1))
2857                 bond_validate_arp(bond, slave, sip, tip);
2858
2859 out_unlock:
2860         if (arp != (struct arphdr *)skb->data)
2861                 kfree(arp);
2862         return RX_HANDLER_ANOTHER;
2863 }
2864
2865 /* function to verify if we're in the arp_interval timeslice, returns true if
2866  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2867  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2868  */
2869 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2870                                   int mod)
2871 {
2872         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2873
2874         return time_in_range(jiffies,
2875                              last_act - delta_in_ticks,
2876                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2877 }
2878
2879 /* This function is called regularly to monitor each slave's link
2880  * ensuring that traffic is being sent and received when arp monitoring
2881  * is used in load-balancing mode. if the adapter has been dormant, then an
2882  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2883  * arp monitoring in active backup mode.
2884  */
2885 static void bond_loadbalance_arp_mon(struct bonding *bond)
2886 {
2887         struct slave *slave, *oldcurrent;
2888         struct list_head *iter;
2889         int do_failover = 0, slave_state_changed = 0;
2890
2891         if (!bond_has_slaves(bond))
2892                 goto re_arm;
2893
2894         rcu_read_lock();
2895
2896         oldcurrent = rcu_dereference(bond->curr_active_slave);
2897         /* see if any of the previous devices are up now (i.e. they have
2898          * xmt and rcv traffic). the curr_active_slave does not come into
2899          * the picture unless it is null. also, slave->last_link_up is not
2900          * needed here because we send an arp on each slave and give a slave
2901          * as long as it needs to get the tx/rx within the delta.
2902          * TODO: what about up/down delay in arp mode? it wasn't here before
2903          *       so it can wait
2904          */
2905         bond_for_each_slave_rcu(bond, slave, iter) {
2906                 unsigned long trans_start = dev_trans_start(slave->dev);
2907
2908                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2909
2910                 if (slave->link != BOND_LINK_UP) {
2911                         if (bond_time_in_interval(bond, trans_start, 1) &&
2912                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2913
2914                                 bond_propose_link_state(slave, BOND_LINK_UP);
2915                                 slave_state_changed = 1;
2916
2917                                 /* primary_slave has no meaning in round-robin
2918                                  * mode. the window of a slave being up and
2919                                  * curr_active_slave being null after enslaving
2920                                  * is closed.
2921                                  */
2922                                 if (!oldcurrent) {
2923                                         slave_info(bond->dev, slave->dev, "link status definitely up\n");
2924                                         do_failover = 1;
2925                                 } else {
2926                                         slave_info(bond->dev, slave->dev, "interface is now up\n");
2927                                 }
2928                         }
2929                 } else {
2930                         /* slave->link == BOND_LINK_UP */
2931
2932                         /* not all switches will respond to an arp request
2933                          * when the source ip is 0, so don't take the link down
2934                          * if we don't know our ip yet
2935                          */
2936                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2937                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2938
2939                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2940                                 slave_state_changed = 1;
2941
2942                                 if (slave->link_failure_count < UINT_MAX)
2943                                         slave->link_failure_count++;
2944
2945                                 slave_info(bond->dev, slave->dev, "interface is now down\n");
2946
2947                                 if (slave == oldcurrent)
2948                                         do_failover = 1;
2949                         }
2950                 }
2951
2952                 /* note: if switch is in round-robin mode, all links
2953                  * must tx arp to ensure all links rx an arp - otherwise
2954                  * links may oscillate or not come up at all; if switch is
2955                  * in something like xor mode, there is nothing we can
2956                  * do - all replies will be rx'ed on same link causing slaves
2957                  * to be unstable during low/no traffic periods
2958                  */
2959                 if (bond_slave_is_up(slave))
2960                         bond_arp_send_all(bond, slave);
2961         }
2962
2963         rcu_read_unlock();
2964
2965         if (do_failover || slave_state_changed) {
2966                 if (!rtnl_trylock())
2967                         goto re_arm;
2968
2969                 bond_for_each_slave(bond, slave, iter) {
2970                         if (slave->link_new_state != BOND_LINK_NOCHANGE)
2971                                 slave->link = slave->link_new_state;
2972                 }
2973
2974                 if (slave_state_changed) {
2975                         bond_slave_state_change(bond);
2976                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2977                                 bond_update_slave_arr(bond, NULL);
2978                 }
2979                 if (do_failover) {
2980                         block_netpoll_tx();
2981                         bond_select_active_slave(bond);
2982                         unblock_netpoll_tx();
2983                 }
2984                 rtnl_unlock();
2985         }
2986
2987 re_arm:
2988         if (bond->params.arp_interval)
2989                 queue_delayed_work(bond->wq, &bond->arp_work,
2990                                    msecs_to_jiffies(bond->params.arp_interval));
2991 }
2992
2993 /* Called to inspect slaves for active-backup mode ARP monitor link state
2994  * changes.  Sets proposed link state in slaves to specify what action
2995  * should take place for the slave.  Returns 0 if no changes are found, >0
2996  * if changes to link states must be committed.
2997  *
2998  * Called with rcu_read_lock held.
2999  */
3000 static int bond_ab_arp_inspect(struct bonding *bond)
3001 {
3002         unsigned long trans_start, last_rx;
3003         struct list_head *iter;
3004         struct slave *slave;
3005         int commit = 0;
3006
3007         bond_for_each_slave_rcu(bond, slave, iter) {
3008                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3009                 last_rx = slave_last_rx(bond, slave);
3010
3011                 if (slave->link != BOND_LINK_UP) {
3012                         if (bond_time_in_interval(bond, last_rx, 1)) {
3013                                 bond_propose_link_state(slave, BOND_LINK_UP);
3014                                 commit++;
3015                         } else if (slave->link == BOND_LINK_BACK) {
3016                                 bond_propose_link_state(slave, BOND_LINK_FAIL);
3017                                 commit++;
3018                         }
3019                         continue;
3020                 }
3021
3022                 /* Give slaves 2*delta after being enslaved or made
3023                  * active.  This avoids bouncing, as the last receive
3024                  * times need a full ARP monitor cycle to be updated.
3025                  */
3026                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
3027                         continue;
3028
3029                 /* Backup slave is down if:
3030                  * - No current_arp_slave AND
3031                  * - more than 3*delta since last receive AND
3032                  * - the bond has an IP address
3033                  *
3034                  * Note: a non-null current_arp_slave indicates
3035                  * the curr_active_slave went down and we are
3036                  * searching for a new one; under this condition
3037                  * we only take the curr_active_slave down - this
3038                  * gives each slave a chance to tx/rx traffic
3039                  * before being taken out
3040                  */
3041                 if (!bond_is_active_slave(slave) &&
3042                     !rcu_access_pointer(bond->current_arp_slave) &&
3043                     !bond_time_in_interval(bond, last_rx, 3)) {
3044                         bond_propose_link_state(slave, BOND_LINK_DOWN);
3045                         commit++;
3046                 }
3047
3048                 /* Active slave is down if:
3049                  * - more than 2*delta since transmitting OR
3050                  * - (more than 2*delta since receive AND
3051                  *    the bond has an IP address)
3052                  */
3053                 trans_start = dev_trans_start(slave->dev);
3054                 if (bond_is_active_slave(slave) &&
3055                     (!bond_time_in_interval(bond, trans_start, 2) ||
3056                      !bond_time_in_interval(bond, last_rx, 2))) {
3057                         bond_propose_link_state(slave, BOND_LINK_DOWN);
3058                         commit++;
3059                 }
3060         }
3061
3062         return commit;
3063 }
3064
3065 /* Called to commit link state changes noted by inspection step of
3066  * active-backup mode ARP monitor.
3067  *
3068  * Called with RTNL hold.
3069  */
3070 static void bond_ab_arp_commit(struct bonding *bond)
3071 {
3072         unsigned long trans_start;
3073         struct list_head *iter;
3074         struct slave *slave;
3075
3076         bond_for_each_slave(bond, slave, iter) {
3077                 switch (slave->link_new_state) {
3078                 case BOND_LINK_NOCHANGE:
3079                         continue;
3080
3081                 case BOND_LINK_UP:
3082                         trans_start = dev_trans_start(slave->dev);
3083                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
3084                             (!rtnl_dereference(bond->curr_active_slave) &&
3085                              bond_time_in_interval(bond, trans_start, 1))) {
3086                                 struct slave *current_arp_slave;
3087
3088                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3089                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
3090                                                           BOND_SLAVE_NOTIFY_NOW);
3091                                 if (current_arp_slave) {
3092                                         bond_set_slave_inactive_flags(
3093                                                 current_arp_slave,
3094                                                 BOND_SLAVE_NOTIFY_NOW);
3095                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3096                                 }
3097
3098                                 slave_info(bond->dev, slave->dev, "link status definitely up\n");
3099
3100                                 if (!rtnl_dereference(bond->curr_active_slave) ||
3101                                     slave == rtnl_dereference(bond->primary_slave))
3102                                         goto do_failover;
3103
3104                         }
3105
3106                         continue;
3107
3108                 case BOND_LINK_DOWN:
3109                         if (slave->link_failure_count < UINT_MAX)
3110                                 slave->link_failure_count++;
3111
3112                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3113                                                   BOND_SLAVE_NOTIFY_NOW);
3114                         bond_set_slave_inactive_flags(slave,
3115                                                       BOND_SLAVE_NOTIFY_NOW);
3116
3117                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3118
3119                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
3120                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3121                                 goto do_failover;
3122                         }
3123
3124                         continue;
3125
3126                 case BOND_LINK_FAIL:
3127                         bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3128                                                   BOND_SLAVE_NOTIFY_NOW);
3129                         bond_set_slave_inactive_flags(slave,
3130                                                       BOND_SLAVE_NOTIFY_NOW);
3131
3132                         /* A slave has just been enslaved and has become
3133                          * the current active slave.
3134                          */
3135                         if (rtnl_dereference(bond->curr_active_slave))
3136                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3137                         continue;
3138
3139                 default:
3140                         slave_err(bond->dev, slave->dev,
3141                                   "impossible: link_new_state %d on slave\n",
3142                                   slave->link_new_state);
3143                         continue;
3144                 }
3145
3146 do_failover:
3147                 block_netpoll_tx();
3148                 bond_select_active_slave(bond);
3149                 unblock_netpoll_tx();
3150         }
3151
3152         bond_set_carrier(bond);
3153 }
3154
3155 /* Send ARP probes for active-backup mode ARP monitor.
3156  *
3157  * Called with rcu_read_lock held.
3158  */
3159 static bool bond_ab_arp_probe(struct bonding *bond)
3160 {
3161         struct slave *slave, *before = NULL, *new_slave = NULL,
3162                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3163                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3164         struct list_head *iter;
3165         bool found = false;
3166         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3167
3168         if (curr_arp_slave && curr_active_slave)
3169                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3170                             curr_arp_slave->dev->name,
3171                             curr_active_slave->dev->name);
3172
3173         if (curr_active_slave) {
3174                 bond_arp_send_all(bond, curr_active_slave);
3175                 return should_notify_rtnl;
3176         }
3177
3178         /* if we don't have a curr_active_slave, search for the next available
3179          * backup slave from the current_arp_slave and make it the candidate
3180          * for becoming the curr_active_slave
3181          */
3182
3183         if (!curr_arp_slave) {
3184                 curr_arp_slave = bond_first_slave_rcu(bond);
3185                 if (!curr_arp_slave)
3186                         return should_notify_rtnl;
3187         }
3188
3189         bond_for_each_slave_rcu(bond, slave, iter) {
3190                 if (!found && !before && bond_slave_is_up(slave))
3191                         before = slave;
3192
3193                 if (found && !new_slave && bond_slave_is_up(slave))
3194                         new_slave = slave;
3195                 /* if the link state is up at this point, we
3196                  * mark it down - this can happen if we have
3197                  * simultaneous link failures and
3198                  * reselect_active_interface doesn't make this
3199                  * one the current slave so it is still marked
3200                  * up when it is actually down
3201                  */
3202                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3203                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3204                                                   BOND_SLAVE_NOTIFY_LATER);
3205                         if (slave->link_failure_count < UINT_MAX)
3206                                 slave->link_failure_count++;
3207
3208                         bond_set_slave_inactive_flags(slave,
3209                                                       BOND_SLAVE_NOTIFY_LATER);
3210
3211                         slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3212                 }
3213                 if (slave == curr_arp_slave)
3214                         found = true;
3215         }
3216
3217         if (!new_slave && before)
3218                 new_slave = before;
3219
3220         if (!new_slave)
3221                 goto check_state;
3222
3223         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3224                                   BOND_SLAVE_NOTIFY_LATER);
3225         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3226         bond_arp_send_all(bond, new_slave);
3227         new_slave->last_link_up = jiffies;
3228         rcu_assign_pointer(bond->current_arp_slave, new_slave);
3229
3230 check_state:
3231         bond_for_each_slave_rcu(bond, slave, iter) {
3232                 if (slave->should_notify || slave->should_notify_link) {
3233                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3234                         break;
3235                 }
3236         }
3237         return should_notify_rtnl;
3238 }
3239
3240 static void bond_activebackup_arp_mon(struct bonding *bond)
3241 {
3242         bool should_notify_peers = false;
3243         bool should_notify_rtnl = false;
3244         int delta_in_ticks;
3245
3246         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3247
3248         if (!bond_has_slaves(bond))
3249                 goto re_arm;
3250
3251         rcu_read_lock();
3252
3253         should_notify_peers = bond_should_notify_peers(bond);
3254
3255         if (bond_ab_arp_inspect(bond)) {
3256                 rcu_read_unlock();
3257
3258                 /* Race avoidance with bond_close flush of workqueue */
3259                 if (!rtnl_trylock()) {
3260                         delta_in_ticks = 1;
3261                         should_notify_peers = false;
3262                         goto re_arm;
3263                 }
3264
3265                 bond_ab_arp_commit(bond);
3266
3267                 rtnl_unlock();
3268                 rcu_read_lock();
3269         }
3270
3271         should_notify_rtnl = bond_ab_arp_probe(bond);
3272         rcu_read_unlock();
3273
3274 re_arm:
3275         if (bond->params.arp_interval)
3276                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3277
3278         if (should_notify_peers || should_notify_rtnl) {
3279                 if (!rtnl_trylock())
3280                         return;
3281
3282                 if (should_notify_peers)
3283                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3284                                                  bond->dev);
3285                 if (should_notify_rtnl) {
3286                         bond_slave_state_notify(bond);
3287                         bond_slave_link_notify(bond);
3288                 }
3289
3290                 rtnl_unlock();
3291         }
3292 }
3293
3294 static void bond_arp_monitor(struct work_struct *work)
3295 {
3296         struct bonding *bond = container_of(work, struct bonding,
3297                                             arp_work.work);
3298
3299         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3300                 bond_activebackup_arp_mon(bond);
3301         else
3302                 bond_loadbalance_arp_mon(bond);
3303 }
3304
3305 /*-------------------------- netdev event handling --------------------------*/
3306
3307 /* Change device name */
3308 static int bond_event_changename(struct bonding *bond)
3309 {
3310         bond_remove_proc_entry(bond);
3311         bond_create_proc_entry(bond);
3312
3313         bond_debug_reregister(bond);
3314
3315         return NOTIFY_DONE;
3316 }
3317
3318 static int bond_master_netdev_event(unsigned long event,
3319                                     struct net_device *bond_dev)
3320 {
3321         struct bonding *event_bond = netdev_priv(bond_dev);
3322
3323         netdev_dbg(bond_dev, "%s called\n", __func__);
3324
3325         switch (event) {
3326         case NETDEV_CHANGENAME:
3327                 return bond_event_changename(event_bond);
3328         case NETDEV_UNREGISTER:
3329                 bond_remove_proc_entry(event_bond);
3330                 break;
3331         case NETDEV_REGISTER:
3332                 bond_create_proc_entry(event_bond);
3333                 break;
3334         default:
3335                 break;
3336         }
3337
3338         return NOTIFY_DONE;
3339 }
3340
3341 static int bond_slave_netdev_event(unsigned long event,
3342                                    struct net_device *slave_dev)
3343 {
3344         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3345         struct bonding *bond;
3346         struct net_device *bond_dev;
3347
3348         /* A netdev event can be generated while enslaving a device
3349          * before netdev_rx_handler_register is called in which case
3350          * slave will be NULL
3351          */
3352         if (!slave) {
3353                 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3354                 return NOTIFY_DONE;
3355         }
3356
3357         bond_dev = slave->bond->dev;
3358         bond = slave->bond;
3359         primary = rtnl_dereference(bond->primary_slave);
3360
3361         slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3362
3363         switch (event) {
3364         case NETDEV_UNREGISTER:
3365                 if (bond_dev->type != ARPHRD_ETHER)
3366                         bond_release_and_destroy(bond_dev, slave_dev);
3367                 else
3368                         __bond_release_one(bond_dev, slave_dev, false, true);
3369                 break;
3370         case NETDEV_UP:
3371         case NETDEV_CHANGE:
3372                 /* For 802.3ad mode only:
3373                  * Getting invalid Speed/Duplex values here will put slave
3374                  * in weird state. Mark it as link-fail if the link was
3375                  * previously up or link-down if it hasn't yet come up, and
3376                  * let link-monitoring (miimon) set it right when correct
3377                  * speeds/duplex are available.
3378                  */
3379                 if (bond_update_speed_duplex(slave) &&
3380                     BOND_MODE(bond) == BOND_MODE_8023AD) {
3381                         if (slave->last_link_up)
3382                                 slave->link = BOND_LINK_FAIL;
3383                         else
3384                                 slave->link = BOND_LINK_DOWN;
3385                 }
3386
3387                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3388                         bond_3ad_adapter_speed_duplex_changed(slave);
3389                 fallthrough;
3390         case NETDEV_DOWN:
3391                 /* Refresh slave-array if applicable!
3392                  * If the setup does not use miimon or arpmon (mode-specific!),
3393                  * then these events will not cause the slave-array to be
3394                  * refreshed. This will cause xmit to use a slave that is not
3395                  * usable. Avoid such situation by refeshing the array at these
3396                  * events. If these (miimon/arpmon) parameters are configured
3397                  * then array gets refreshed twice and that should be fine!
3398                  */
3399                 if (bond_mode_can_use_xmit_hash(bond))
3400                         bond_update_slave_arr(bond, NULL);
3401                 break;
3402         case NETDEV_CHANGEMTU:
3403                 /* TODO: Should slaves be allowed to
3404                  * independently alter their MTU?  For
3405                  * an active-backup bond, slaves need
3406                  * not be the same type of device, so
3407                  * MTUs may vary.  For other modes,
3408                  * slaves arguably should have the
3409                  * same MTUs. To do this, we'd need to
3410                  * take over the slave's change_mtu
3411                  * function for the duration of their
3412                  * servitude.
3413                  */
3414                 break;
3415         case NETDEV_CHANGENAME:
3416                 /* we don't care if we don't have primary set */
3417                 if (!bond_uses_primary(bond) ||
3418                     !bond->params.primary[0])
3419                         break;
3420
3421                 if (slave == primary) {
3422                         /* slave's name changed - he's no longer primary */
3423                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3424                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3425                         /* we have a new primary slave */
3426                         rcu_assign_pointer(bond->primary_slave, slave);
3427                 } else { /* we didn't change primary - exit */
3428                         break;
3429                 }
3430
3431                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3432                             primary ? slave_dev->name : "none");
3433
3434                 block_netpoll_tx();
3435                 bond_select_active_slave(bond);
3436                 unblock_netpoll_tx();
3437                 break;
3438         case NETDEV_FEAT_CHANGE:
3439                 bond_compute_features(bond);
3440                 break;
3441         case NETDEV_RESEND_IGMP:
3442                 /* Propagate to master device */
3443                 call_netdevice_notifiers(event, slave->bond->dev);
3444                 break;
3445         default:
3446                 break;
3447         }
3448
3449         return NOTIFY_DONE;
3450 }
3451
3452 /* bond_netdev_event: handle netdev notifier chain events.
3453  *
3454  * This function receives events for the netdev chain.  The caller (an
3455  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3456  * locks for us to safely manipulate the slave devices (RTNL lock,
3457  * dev_probe_lock).
3458  */
3459 static int bond_netdev_event(struct notifier_block *this,
3460                              unsigned long event, void *ptr)
3461 {
3462         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3463
3464         netdev_dbg(event_dev, "%s received %s\n",
3465                    __func__, netdev_cmd_to_name(event));
3466
3467         if (!(event_dev->priv_flags & IFF_BONDING))
3468                 return NOTIFY_DONE;
3469
3470         if (event_dev->flags & IFF_MASTER) {
3471                 int ret;
3472
3473                 ret = bond_master_netdev_event(event, event_dev);
3474                 if (ret != NOTIFY_DONE)
3475                         return ret;
3476         }
3477
3478         if (event_dev->flags & IFF_SLAVE)
3479                 return bond_slave_netdev_event(event, event_dev);
3480
3481         return NOTIFY_DONE;
3482 }
3483
3484 static struct notifier_block bond_netdev_notifier = {
3485         .notifier_call = bond_netdev_event,
3486 };
3487
3488 /*---------------------------- Hashing Policies -----------------------------*/
3489
3490 /* L2 hash helper */
3491 static inline u32 bond_eth_hash(struct sk_buff *skb)
3492 {
3493         struct ethhdr *ep, hdr_tmp;
3494
3495         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3496         if (ep)
3497                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3498         return 0;
3499 }
3500
3501 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk,
3502                          int *noff, int *proto, bool l34)
3503 {
3504         const struct ipv6hdr *iph6;
3505         const struct iphdr *iph;
3506
3507         if (skb->protocol == htons(ETH_P_IP)) {
3508                 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph))))
3509                         return false;
3510                 iph = (const struct iphdr *)(skb->data + *noff);
3511                 iph_to_flow_copy_v4addrs(fk, iph);
3512                 *noff += iph->ihl << 2;
3513                 if (!ip_is_fragment(iph))
3514                         *proto = iph->protocol;
3515         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3516                 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph6))))
3517                         return false;
3518                 iph6 = (const struct ipv6hdr *)(skb->data + *noff);
3519                 iph_to_flow_copy_v6addrs(fk, iph6);
3520                 *noff += sizeof(*iph6);
3521                 *proto = iph6->nexthdr;
3522         } else {
3523                 return false;
3524         }
3525
3526         if (l34 && *proto >= 0)
3527                 fk->ports.ports = skb_flow_get_ports(skb, *noff, *proto);
3528
3529         return true;
3530 }
3531
3532 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb)
3533 {
3534         struct ethhdr *mac_hdr = (struct ethhdr *)skb_mac_header(skb);
3535         u32 srcmac_vendor = 0, srcmac_dev = 0;
3536         u16 vlan;
3537         int i;
3538
3539         for (i = 0; i < 3; i++)
3540                 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i];
3541
3542         for (i = 3; i < ETH_ALEN; i++)
3543                 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i];
3544
3545         if (!skb_vlan_tag_present(skb))
3546                 return srcmac_vendor ^ srcmac_dev;
3547
3548         vlan = skb_vlan_tag_get(skb);
3549
3550         return vlan ^ srcmac_vendor ^ srcmac_dev;
3551 }
3552
3553 /* Extract the appropriate headers based on bond's xmit policy */
3554 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3555                               struct flow_keys *fk)
3556 {
3557         bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
3558         int noff, proto = -1;
3559
3560         switch (bond->params.xmit_policy) {
3561         case BOND_XMIT_POLICY_ENCAP23:
3562         case BOND_XMIT_POLICY_ENCAP34:
3563                 memset(fk, 0, sizeof(*fk));
3564                 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
3565                                           fk, NULL, 0, 0, 0, 0);
3566         default:
3567                 break;
3568         }
3569
3570         fk->ports.ports = 0;
3571         memset(&fk->icmp, 0, sizeof(fk->icmp));
3572         noff = skb_network_offset(skb);
3573         if (!bond_flow_ip(skb, fk, &noff, &proto, l34))
3574                 return false;
3575
3576         /* ICMP error packets contains at least 8 bytes of the header
3577          * of the packet which generated the error. Use this information
3578          * to correlate ICMP error packets within the same flow which
3579          * generated the error.
3580          */
3581         if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) {
3582                 skb_flow_get_icmp_tci(skb, &fk->icmp, skb->data,
3583                                       skb_transport_offset(skb),
3584                                       skb_headlen(skb));
3585                 if (proto == IPPROTO_ICMP) {
3586                         if (!icmp_is_err(fk->icmp.type))
3587                                 return true;
3588
3589                         noff += sizeof(struct icmphdr);
3590                 } else if (proto == IPPROTO_ICMPV6) {
3591                         if (!icmpv6_is_err(fk->icmp.type))
3592                                 return true;
3593
3594                         noff += sizeof(struct icmp6hdr);
3595                 }
3596                 return bond_flow_ip(skb, fk, &noff, &proto, l34);
3597         }
3598
3599         return true;
3600 }
3601
3602 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow)
3603 {
3604         hash ^= (__force u32)flow_get_u32_dst(flow) ^
3605                 (__force u32)flow_get_u32_src(flow);
3606         hash ^= (hash >> 16);
3607         hash ^= (hash >> 8);
3608         /* discard lowest hash bit to deal with the common even ports pattern */
3609         return hash >> 1;
3610 }
3611
3612 /**
3613  * bond_xmit_hash - generate a hash value based on the xmit policy
3614  * @bond: bonding device
3615  * @skb: buffer to use for headers
3616  *
3617  * This function will extract the necessary headers from the skb buffer and use
3618  * them to generate a hash based on the xmit_policy set in the bonding device
3619  */
3620 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3621 {
3622         struct flow_keys flow;
3623         u32 hash;
3624
3625         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3626             skb->l4_hash)
3627                 return skb->hash;
3628
3629         if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC)
3630                 return bond_vlan_srcmac_hash(skb);
3631
3632         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3633             !bond_flow_dissect(bond, skb, &flow))
3634                 return bond_eth_hash(skb);
3635
3636         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3637             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
3638                 hash = bond_eth_hash(skb);
3639         } else {
3640                 if (flow.icmp.id)
3641                         memcpy(&hash, &flow.icmp, sizeof(hash));
3642                 else
3643                         memcpy(&hash, &flow.ports.ports, sizeof(hash));
3644         }
3645
3646         return bond_ip_hash(hash, &flow);
3647 }
3648
3649 /*-------------------------- Device entry points ----------------------------*/
3650
3651 void bond_work_init_all(struct bonding *bond)
3652 {
3653         INIT_DELAYED_WORK(&bond->mcast_work,
3654                           bond_resend_igmp_join_requests_delayed);
3655         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3656         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3657         INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3658         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3659         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3660 }
3661
3662 static void bond_work_cancel_all(struct bonding *bond)
3663 {
3664         cancel_delayed_work_sync(&bond->mii_work);
3665         cancel_delayed_work_sync(&bond->arp_work);
3666         cancel_delayed_work_sync(&bond->alb_work);
3667         cancel_delayed_work_sync(&bond->ad_work);
3668         cancel_delayed_work_sync(&bond->mcast_work);
3669         cancel_delayed_work_sync(&bond->slave_arr_work);
3670 }
3671
3672 static int bond_open(struct net_device *bond_dev)
3673 {
3674         struct bonding *bond = netdev_priv(bond_dev);
3675         struct list_head *iter;
3676         struct slave *slave;
3677
3678         /* reset slave->backup and slave->inactive */
3679         if (bond_has_slaves(bond)) {
3680                 bond_for_each_slave(bond, slave, iter) {
3681                         if (bond_uses_primary(bond) &&
3682                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3683                                 bond_set_slave_inactive_flags(slave,
3684                                                               BOND_SLAVE_NOTIFY_NOW);
3685                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3686                                 bond_set_slave_active_flags(slave,
3687                                                             BOND_SLAVE_NOTIFY_NOW);
3688                         }
3689                 }
3690         }
3691
3692         if (bond_is_lb(bond)) {
3693                 /* bond_alb_initialize must be called before the timer
3694                  * is started.
3695                  */
3696                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3697                         return -ENOMEM;
3698                 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3699                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3700         }
3701
3702         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3703                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3704
3705         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3706                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3707                 bond->recv_probe = bond_arp_rcv;
3708         }
3709
3710         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3711                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3712                 /* register to receive LACPDUs */
3713                 bond->recv_probe = bond_3ad_lacpdu_recv;
3714                 bond_3ad_initiate_agg_selection(bond, 1);
3715         }
3716
3717         if (bond_mode_can_use_xmit_hash(bond))
3718                 bond_update_slave_arr(bond, NULL);
3719
3720         return 0;
3721 }
3722
3723 static int bond_close(struct net_device *bond_dev)
3724 {
3725         struct bonding *bond = netdev_priv(bond_dev);
3726
3727         bond_work_cancel_all(bond);
3728         bond->send_peer_notif = 0;
3729         if (bond_is_lb(bond))
3730                 bond_alb_deinitialize(bond);
3731         bond->recv_probe = NULL;
3732
3733         return 0;
3734 }
3735
3736 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3737  * that some drivers can provide 32bit values only.
3738  */
3739 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3740                             const struct rtnl_link_stats64 *_new,
3741                             const struct rtnl_link_stats64 *_old)
3742 {
3743         const u64 *new = (const u64 *)_new;
3744         const u64 *old = (const u64 *)_old;
3745         u64 *res = (u64 *)_res;
3746         int i;
3747
3748         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3749                 u64 nv = new[i];
3750                 u64 ov = old[i];
3751                 s64 delta = nv - ov;
3752
3753                 /* detects if this particular field is 32bit only */
3754                 if (((nv | ov) >> 32) == 0)
3755                         delta = (s64)(s32)((u32)nv - (u32)ov);
3756
3757                 /* filter anomalies, some drivers reset their stats
3758                  * at down/up events.
3759                  */
3760                 if (delta > 0)
3761                         res[i] += delta;
3762         }
3763 }
3764
3765 #ifdef CONFIG_LOCKDEP
3766 static int bond_get_lowest_level_rcu(struct net_device *dev)
3767 {
3768         struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
3769         struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
3770         int cur = 0, max = 0;
3771
3772         now = dev;
3773         iter = &dev->adj_list.lower;
3774
3775         while (1) {
3776                 next = NULL;
3777                 while (1) {
3778                         ldev = netdev_next_lower_dev_rcu(now, &iter);
3779                         if (!ldev)
3780                                 break;
3781
3782                         next = ldev;
3783                         niter = &ldev->adj_list.lower;
3784                         dev_stack[cur] = now;
3785                         iter_stack[cur++] = iter;
3786                         if (max <= cur)
3787                                 max = cur;
3788                         break;
3789                 }
3790
3791                 if (!next) {
3792                         if (!cur)
3793                                 return max;
3794                         next = dev_stack[--cur];
3795                         niter = iter_stack[cur];
3796                 }
3797
3798                 now = next;
3799                 iter = niter;
3800         }
3801
3802         return max;
3803 }
3804 #endif
3805
3806 static void bond_get_stats(struct net_device *bond_dev,
3807                            struct rtnl_link_stats64 *stats)
3808 {
3809         struct bonding *bond = netdev_priv(bond_dev);
3810         struct rtnl_link_stats64 temp;
3811         struct list_head *iter;
3812         struct slave *slave;
3813         int nest_level = 0;
3814
3815
3816         rcu_read_lock();
3817 #ifdef CONFIG_LOCKDEP
3818         nest_level = bond_get_lowest_level_rcu(bond_dev);
3819 #endif
3820
3821         spin_lock_nested(&bond->stats_lock, nest_level);
3822         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3823
3824         bond_for_each_slave_rcu(bond, slave, iter) {
3825                 const struct rtnl_link_stats64 *new =
3826                         dev_get_stats(slave->dev, &temp);
3827
3828                 bond_fold_stats(stats, new, &slave->slave_stats);
3829
3830                 /* save off the slave stats for the next run */
3831                 memcpy(&slave->slave_stats, new, sizeof(*new));
3832         }
3833
3834         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3835         spin_unlock(&bond->stats_lock);
3836         rcu_read_unlock();
3837 }
3838
3839 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3840 {
3841         struct bonding *bond = netdev_priv(bond_dev);
3842         struct net_device *slave_dev = NULL;
3843         struct ifbond k_binfo;
3844         struct ifbond __user *u_binfo = NULL;
3845         struct ifslave k_sinfo;
3846         struct ifslave __user *u_sinfo = NULL;
3847         struct mii_ioctl_data *mii = NULL;
3848         struct bond_opt_value newval;
3849         struct net *net;
3850         int res = 0;
3851
3852         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3853
3854         switch (cmd) {
3855         case SIOCGMIIPHY:
3856                 mii = if_mii(ifr);
3857                 if (!mii)
3858                         return -EINVAL;
3859
3860                 mii->phy_id = 0;
3861                 fallthrough;
3862         case SIOCGMIIREG:
3863                 /* We do this again just in case we were called by SIOCGMIIREG
3864                  * instead of SIOCGMIIPHY.
3865                  */
3866                 mii = if_mii(ifr);
3867                 if (!mii)
3868                         return -EINVAL;
3869
3870                 if (mii->reg_num == 1) {
3871                         mii->val_out = 0;
3872                         if (netif_carrier_ok(bond->dev))
3873                                 mii->val_out = BMSR_LSTATUS;
3874                 }
3875
3876                 return 0;
3877         case BOND_INFO_QUERY_OLD:
3878         case SIOCBONDINFOQUERY:
3879                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3880
3881                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3882                         return -EFAULT;
3883
3884                 bond_info_query(bond_dev, &k_binfo);
3885                 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3886                         return -EFAULT;
3887
3888                 return 0;
3889         case BOND_SLAVE_INFO_QUERY_OLD:
3890         case SIOCBONDSLAVEINFOQUERY:
3891                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3892
3893                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3894                         return -EFAULT;
3895
3896                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3897                 if (res == 0 &&
3898                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3899                         return -EFAULT;
3900
3901                 return res;
3902         default:
3903                 break;
3904         }
3905
3906         net = dev_net(bond_dev);
3907
3908         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3909                 return -EPERM;
3910
3911         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3912
3913         slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3914
3915         if (!slave_dev)
3916                 return -ENODEV;
3917
3918         switch (cmd) {
3919         case BOND_ENSLAVE_OLD:
3920         case SIOCBONDENSLAVE:
3921                 res = bond_enslave(bond_dev, slave_dev, NULL);
3922                 break;
3923         case BOND_RELEASE_OLD:
3924         case SIOCBONDRELEASE:
3925                 res = bond_release(bond_dev, slave_dev);
3926                 break;
3927         case BOND_SETHWADDR_OLD:
3928         case SIOCBONDSETHWADDR:
3929                 res = bond_set_dev_addr(bond_dev, slave_dev);
3930                 break;
3931         case BOND_CHANGE_ACTIVE_OLD:
3932         case SIOCBONDCHANGEACTIVE:
3933                 bond_opt_initstr(&newval, slave_dev->name);
3934                 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3935                                             &newval);
3936                 break;
3937         default:
3938                 res = -EOPNOTSUPP;
3939         }
3940
3941         return res;
3942 }
3943
3944 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3945 {
3946         struct bonding *bond = netdev_priv(bond_dev);
3947
3948         if (change & IFF_PROMISC)
3949                 bond_set_promiscuity(bond,
3950                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3951
3952         if (change & IFF_ALLMULTI)
3953                 bond_set_allmulti(bond,
3954                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3955 }
3956
3957 static void bond_set_rx_mode(struct net_device *bond_dev)
3958 {
3959         struct bonding *bond = netdev_priv(bond_dev);
3960         struct list_head *iter;
3961         struct slave *slave;
3962
3963         rcu_read_lock();
3964         if (bond_uses_primary(bond)) {
3965                 slave = rcu_dereference(bond->curr_active_slave);
3966                 if (slave) {
3967                         dev_uc_sync(slave->dev, bond_dev);
3968                         dev_mc_sync(slave->dev, bond_dev);
3969                 }
3970         } else {
3971                 bond_for_each_slave_rcu(bond, slave, iter) {
3972                         dev_uc_sync_multiple(slave->dev, bond_dev);
3973                         dev_mc_sync_multiple(slave->dev, bond_dev);
3974                 }
3975         }
3976         rcu_read_unlock();
3977 }
3978
3979 static int bond_neigh_init(struct neighbour *n)
3980 {
3981         struct bonding *bond = netdev_priv(n->dev);
3982         const struct net_device_ops *slave_ops;
3983         struct neigh_parms parms;
3984         struct slave *slave;
3985         int ret = 0;
3986
3987         rcu_read_lock();
3988         slave = bond_first_slave_rcu(bond);
3989         if (!slave)
3990                 goto out;
3991         slave_ops = slave->dev->netdev_ops;
3992         if (!slave_ops->ndo_neigh_setup)
3993                 goto out;
3994
3995         /* TODO: find another way [1] to implement this.
3996          * Passing a zeroed structure is fragile,
3997          * but at least we do not pass garbage.
3998          *
3999          * [1] One way would be that ndo_neigh_setup() never touch
4000          *     struct neigh_parms, but propagate the new neigh_setup()
4001          *     back to ___neigh_create() / neigh_parms_alloc()
4002          */
4003         memset(&parms, 0, sizeof(parms));
4004         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
4005
4006         if (ret)
4007                 goto out;
4008
4009         if (parms.neigh_setup)
4010                 ret = parms.neigh_setup(n);
4011 out:
4012         rcu_read_unlock();
4013         return ret;
4014 }
4015
4016 /* The bonding ndo_neigh_setup is called at init time beofre any
4017  * slave exists. So we must declare proxy setup function which will
4018  * be used at run time to resolve the actual slave neigh param setup.
4019  *
4020  * It's also called by master devices (such as vlans) to setup their
4021  * underlying devices. In that case - do nothing, we're already set up from
4022  * our init.
4023  */
4024 static int bond_neigh_setup(struct net_device *dev,
4025                             struct neigh_parms *parms)
4026 {
4027         /* modify only our neigh_parms */
4028         if (parms->dev == dev)
4029                 parms->neigh_setup = bond_neigh_init;
4030
4031         return 0;
4032 }
4033
4034 /* Change the MTU of all of a master's slaves to match the master */
4035 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4036 {
4037         struct bonding *bond = netdev_priv(bond_dev);
4038         struct slave *slave, *rollback_slave;
4039         struct list_head *iter;
4040         int res = 0;
4041
4042         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
4043
4044         bond_for_each_slave(bond, slave, iter) {
4045                 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
4046                            slave, slave->dev->netdev_ops->ndo_change_mtu);
4047
4048                 res = dev_set_mtu(slave->dev, new_mtu);
4049
4050                 if (res) {
4051                         /* If we failed to set the slave's mtu to the new value
4052                          * we must abort the operation even in ACTIVE_BACKUP
4053                          * mode, because if we allow the backup slaves to have
4054                          * different mtu values than the active slave we'll
4055                          * need to change their mtu when doing a failover. That
4056                          * means changing their mtu from timer context, which
4057                          * is probably not a good idea.
4058                          */
4059                         slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
4060                                   res, new_mtu);
4061                         goto unwind;
4062                 }
4063         }
4064
4065         bond_dev->mtu = new_mtu;
4066
4067         return 0;
4068
4069 unwind:
4070         /* unwind from head to the slave that failed */
4071         bond_for_each_slave(bond, rollback_slave, iter) {
4072                 int tmp_res;
4073
4074                 if (rollback_slave == slave)
4075                         break;
4076
4077                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
4078                 if (tmp_res)
4079                         slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
4080                                   tmp_res);
4081         }
4082
4083         return res;
4084 }
4085
4086 /* Change HW address
4087  *
4088  * Note that many devices must be down to change the HW address, and
4089  * downing the master releases all slaves.  We can make bonds full of
4090  * bonding devices to test this, however.
4091  */
4092 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4093 {
4094         struct bonding *bond = netdev_priv(bond_dev);
4095         struct slave *slave, *rollback_slave;
4096         struct sockaddr_storage *ss = addr, tmp_ss;
4097         struct list_head *iter;
4098         int res = 0;
4099
4100         if (BOND_MODE(bond) == BOND_MODE_ALB)
4101                 return bond_alb_set_mac_address(bond_dev, addr);
4102
4103
4104         netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4105
4106         /* If fail_over_mac is enabled, do nothing and return success.
4107          * Returning an error causes ifenslave to fail.
4108          */
4109         if (bond->params.fail_over_mac &&
4110             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4111                 return 0;
4112
4113         if (!is_valid_ether_addr(ss->__data))
4114                 return -EADDRNOTAVAIL;
4115
4116         bond_for_each_slave(bond, slave, iter) {
4117                 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4118                           __func__, slave);
4119                 res = dev_set_mac_address(slave->dev, addr, NULL);
4120                 if (res) {
4121                         /* TODO: consider downing the slave
4122                          * and retry ?
4123                          * User should expect communications
4124                          * breakage anyway until ARP finish
4125                          * updating, so...
4126                          */
4127                         slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4128                                   __func__, res);
4129                         goto unwind;
4130                 }
4131         }
4132
4133         /* success */
4134         memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
4135         return 0;
4136
4137 unwind:
4138         memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4139         tmp_ss.ss_family = bond_dev->type;
4140
4141         /* unwind from head to the slave that failed */
4142         bond_for_each_slave(bond, rollback_slave, iter) {
4143                 int tmp_res;
4144
4145                 if (rollback_slave == slave)
4146                         break;
4147
4148                 tmp_res = dev_set_mac_address(rollback_slave->dev,
4149                                               (struct sockaddr *)&tmp_ss, NULL);
4150                 if (tmp_res) {
4151                         slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4152                                    __func__, tmp_res);
4153                 }
4154         }
4155
4156         return res;
4157 }
4158
4159 /**
4160  * bond_get_slave_by_id - get xmit slave with slave_id
4161  * @bond: bonding device that is transmitting
4162  * @slave_id: slave id up to slave_cnt-1 through which to transmit
4163  *
4164  * This function tries to get slave with slave_id but in case
4165  * it fails, it tries to find the first available slave for transmission.
4166  */
4167 static struct slave *bond_get_slave_by_id(struct bonding *bond,
4168                                           int slave_id)
4169 {
4170         struct list_head *iter;
4171         struct slave *slave;
4172         int i = slave_id;
4173
4174         /* Here we start from the slave with slave_id */
4175         bond_for_each_slave_rcu(bond, slave, iter) {
4176                 if (--i < 0) {
4177                         if (bond_slave_can_tx(slave))
4178                                 return slave;
4179                 }
4180         }
4181
4182         /* Here we start from the first slave up to slave_id */
4183         i = slave_id;
4184         bond_for_each_slave_rcu(bond, slave, iter) {
4185                 if (--i < 0)
4186                         break;
4187                 if (bond_slave_can_tx(slave))
4188                         return slave;
4189         }
4190         /* no slave that can tx has been found */
4191         return NULL;
4192 }
4193
4194 /**
4195  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4196  * @bond: bonding device to use
4197  *
4198  * Based on the value of the bonding device's packets_per_slave parameter
4199  * this function generates a slave id, which is usually used as the next
4200  * slave to transmit through.
4201  */
4202 static u32 bond_rr_gen_slave_id(struct bonding *bond)
4203 {
4204         u32 slave_id;
4205         struct reciprocal_value reciprocal_packets_per_slave;
4206         int packets_per_slave = bond->params.packets_per_slave;
4207
4208         switch (packets_per_slave) {
4209         case 0:
4210                 slave_id = prandom_u32();
4211                 break;
4212         case 1:
4213                 slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
4214                 break;
4215         default:
4216                 reciprocal_packets_per_slave =
4217                         bond->params.reciprocal_packets_per_slave;
4218                 slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
4219                 slave_id = reciprocal_divide(slave_id,
4220                                              reciprocal_packets_per_slave);
4221                 break;
4222         }
4223
4224         return slave_id;
4225 }
4226
4227 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4228                                                     struct sk_buff *skb)
4229 {
4230         struct slave *slave;
4231         int slave_cnt;
4232         u32 slave_id;
4233
4234         /* Start with the curr_active_slave that joined the bond as the
4235          * default for sending IGMP traffic.  For failover purposes one
4236          * needs to maintain some consistency for the interface that will
4237          * send the join/membership reports.  The curr_active_slave found
4238          * will send all of this type of traffic.
4239          */
4240         if (skb->protocol == htons(ETH_P_IP)) {
4241                 int noff = skb_network_offset(skb);
4242                 struct iphdr *iph;
4243
4244                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4245                         goto non_igmp;
4246
4247                 iph = ip_hdr(skb);
4248                 if (iph->protocol == IPPROTO_IGMP) {
4249                         slave = rcu_dereference(bond->curr_active_slave);
4250                         if (slave)
4251                                 return slave;
4252                         return bond_get_slave_by_id(bond, 0);
4253                 }
4254         }
4255
4256 non_igmp:
4257         slave_cnt = READ_ONCE(bond->slave_cnt);
4258         if (likely(slave_cnt)) {
4259                 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4260                 return bond_get_slave_by_id(bond, slave_id);
4261         }
4262         return NULL;
4263 }
4264
4265 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4266                                         struct net_device *bond_dev)
4267 {
4268         struct bonding *bond = netdev_priv(bond_dev);
4269         struct slave *slave;
4270
4271         slave = bond_xmit_roundrobin_slave_get(bond, skb);
4272         if (likely(slave))
4273                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4274
4275         return bond_tx_drop(bond_dev, skb);
4276 }
4277
4278 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond,
4279                                                       struct sk_buff *skb)
4280 {
4281         return rcu_dereference(bond->curr_active_slave);
4282 }
4283
4284 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
4285  * the bond has a usable interface.
4286  */
4287 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4288                                           struct net_device *bond_dev)
4289 {
4290         struct bonding *bond = netdev_priv(bond_dev);
4291         struct slave *slave;
4292
4293         slave = bond_xmit_activebackup_slave_get(bond, skb);
4294         if (slave)
4295                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4296
4297         return bond_tx_drop(bond_dev, skb);
4298 }
4299
4300 /* Use this to update slave_array when (a) it's not appropriate to update
4301  * slave_array right away (note that update_slave_array() may sleep)
4302  * and / or (b) RTNL is not held.
4303  */
4304 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4305 {
4306         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4307 }
4308
4309 /* Slave array work handler. Holds only RTNL */
4310 static void bond_slave_arr_handler(struct work_struct *work)
4311 {
4312         struct bonding *bond = container_of(work, struct bonding,
4313                                             slave_arr_work.work);
4314         int ret;
4315
4316         if (!rtnl_trylock())
4317                 goto err;
4318
4319         ret = bond_update_slave_arr(bond, NULL);
4320         rtnl_unlock();
4321         if (ret) {
4322                 pr_warn_ratelimited("Failed to update slave array from WT\n");
4323                 goto err;
4324         }
4325         return;
4326
4327 err:
4328         bond_slave_arr_work_rearm(bond, 1);
4329 }
4330
4331 static void bond_skip_slave(struct bond_up_slave *slaves,
4332                             struct slave *skipslave)
4333 {
4334         int idx;
4335
4336         /* Rare situation where caller has asked to skip a specific
4337          * slave but allocation failed (most likely!). BTW this is
4338          * only possible when the call is initiated from
4339          * __bond_release_one(). In this situation; overwrite the
4340          * skipslave entry in the array with the last entry from the
4341          * array to avoid a situation where the xmit path may choose
4342          * this to-be-skipped slave to send a packet out.
4343          */
4344         for (idx = 0; slaves && idx < slaves->count; idx++) {
4345                 if (skipslave == slaves->arr[idx]) {
4346                         slaves->arr[idx] =
4347                                 slaves->arr[slaves->count - 1];
4348                         slaves->count--;
4349                         break;
4350                 }
4351         }
4352 }
4353
4354 static void bond_set_slave_arr(struct bonding *bond,
4355                                struct bond_up_slave *usable_slaves,
4356                                struct bond_up_slave *all_slaves)
4357 {
4358         struct bond_up_slave *usable, *all;
4359
4360         usable = rtnl_dereference(bond->usable_slaves);
4361         rcu_assign_pointer(bond->usable_slaves, usable_slaves);
4362         kfree_rcu(usable, rcu);
4363
4364         all = rtnl_dereference(bond->all_slaves);
4365         rcu_assign_pointer(bond->all_slaves, all_slaves);
4366         kfree_rcu(all, rcu);
4367 }
4368
4369 static void bond_reset_slave_arr(struct bonding *bond)
4370 {
4371         struct bond_up_slave *usable, *all;
4372
4373         usable = rtnl_dereference(bond->usable_slaves);
4374         if (usable) {
4375                 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4376                 kfree_rcu(usable, rcu);
4377         }
4378
4379         all = rtnl_dereference(bond->all_slaves);
4380         if (all) {
4381                 RCU_INIT_POINTER(bond->all_slaves, NULL);
4382                 kfree_rcu(all, rcu);
4383         }
4384 }
4385
4386 /* Build the usable slaves array in control path for modes that use xmit-hash
4387  * to determine the slave interface -
4388  * (a) BOND_MODE_8023AD
4389  * (b) BOND_MODE_XOR
4390  * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
4391  *
4392  * The caller is expected to hold RTNL only and NO other lock!
4393  */
4394 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
4395 {
4396         struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
4397         struct slave *slave;
4398         struct list_head *iter;
4399         int agg_id = 0;
4400         int ret = 0;
4401
4402         might_sleep();
4403
4404         usable_slaves = kzalloc(struct_size(usable_slaves, arr,
4405                                             bond->slave_cnt), GFP_KERNEL);
4406         all_slaves = kzalloc(struct_size(all_slaves, arr,
4407                                          bond->slave_cnt), GFP_KERNEL);
4408         if (!usable_slaves || !all_slaves) {
4409                 ret = -ENOMEM;
4410                 goto out;
4411         }
4412         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4413                 struct ad_info ad_info;
4414
4415                 spin_lock_bh(&bond->mode_lock);
4416                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
4417                         spin_unlock_bh(&bond->mode_lock);
4418                         pr_debug("bond_3ad_get_active_agg_info failed\n");
4419                         /* No active aggragator means it's not safe to use
4420                          * the previous array.
4421                          */
4422                         bond_reset_slave_arr(bond);
4423                         goto out;
4424                 }
4425                 spin_unlock_bh(&bond->mode_lock);
4426                 agg_id = ad_info.aggregator_id;
4427         }
4428         bond_for_each_slave(bond, slave, iter) {
4429                 if (skipslave == slave)
4430                         continue;
4431
4432                 all_slaves->arr[all_slaves->count++] = slave;
4433                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4434                         struct aggregator *agg;
4435
4436                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
4437                         if (!agg || agg->aggregator_identifier != agg_id)
4438                                 continue;
4439                 }
4440                 if (!bond_slave_can_tx(slave))
4441                         continue;
4442
4443                 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4444                           usable_slaves->count);
4445
4446                 usable_slaves->arr[usable_slaves->count++] = slave;
4447         }
4448
4449         bond_set_slave_arr(bond, usable_slaves, all_slaves);
4450         return ret;
4451 out:
4452         if (ret != 0 && skipslave) {
4453                 bond_skip_slave(rtnl_dereference(bond->all_slaves),
4454                                 skipslave);
4455                 bond_skip_slave(rtnl_dereference(bond->usable_slaves),
4456                                 skipslave);
4457         }
4458         kfree_rcu(all_slaves, rcu);
4459         kfree_rcu(usable_slaves, rcu);
4460
4461         return ret;
4462 }
4463
4464 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
4465                                                  struct sk_buff *skb,
4466                                                  struct bond_up_slave *slaves)
4467 {
4468         struct slave *slave;
4469         unsigned int count;
4470         u32 hash;
4471
4472         hash = bond_xmit_hash(bond, skb);
4473         count = slaves ? READ_ONCE(slaves->count) : 0;
4474         if (unlikely(!count))
4475                 return NULL;
4476
4477         slave = slaves->arr[hash % count];
4478         return slave;
4479 }
4480
4481 /* Use this Xmit function for 3AD as well as XOR modes. The current
4482  * usable slave array is formed in the control path. The xmit function
4483  * just calculates hash and sends the packet out.
4484  */
4485 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4486                                      struct net_device *dev)
4487 {
4488         struct bonding *bond = netdev_priv(dev);
4489         struct bond_up_slave *slaves;
4490         struct slave *slave;
4491
4492         slaves = rcu_dereference(bond->usable_slaves);
4493         slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4494         if (likely(slave))
4495                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4496
4497         return bond_tx_drop(dev, skb);
4498 }
4499
4500 /* in broadcast mode, we send everything to all usable interfaces. */
4501 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4502                                        struct net_device *bond_dev)
4503 {
4504         struct bonding *bond = netdev_priv(bond_dev);
4505         struct slave *slave = NULL;
4506         struct list_head *iter;
4507
4508         bond_for_each_slave_rcu(bond, slave, iter) {
4509                 if (bond_is_last_slave(bond, slave))
4510                         break;
4511                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4512                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4513
4514                         if (!skb2) {
4515                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4516                                                     bond_dev->name, __func__);
4517                                 continue;
4518                         }
4519                         bond_dev_queue_xmit(bond, skb2, slave->dev);
4520                 }
4521         }
4522         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4523                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4524
4525         return bond_tx_drop(bond_dev, skb);
4526 }
4527
4528 /*------------------------- Device initialization ---------------------------*/
4529
4530 /* Lookup the slave that corresponds to a qid */
4531 static inline int bond_slave_override(struct bonding *bond,
4532                                       struct sk_buff *skb)
4533 {
4534         struct slave *slave = NULL;
4535         struct list_head *iter;
4536
4537         if (!skb_rx_queue_recorded(skb))
4538                 return 1;
4539
4540         /* Find out if any slaves have the same mapping as this skb. */
4541         bond_for_each_slave_rcu(bond, slave, iter) {
4542                 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4543                         if (bond_slave_is_up(slave) &&
4544                             slave->link == BOND_LINK_UP) {
4545                                 bond_dev_queue_xmit(bond, skb, slave->dev);
4546                                 return 0;
4547                         }
4548                         /* If the slave isn't UP, use default transmit policy. */
4549                         break;
4550                 }
4551         }
4552
4553         return 1;
4554 }
4555
4556
4557 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4558                              struct net_device *sb_dev)
4559 {
4560         /* This helper function exists to help dev_pick_tx get the correct
4561          * destination queue.  Using a helper function skips a call to
4562          * skb_tx_hash and will put the skbs in the queue we expect on their
4563          * way down to the bonding driver.
4564          */
4565         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4566
4567         /* Save the original txq to restore before passing to the driver */
4568         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4569
4570         if (unlikely(txq >= dev->real_num_tx_queues)) {
4571                 do {
4572                         txq -= dev->real_num_tx_queues;
4573                 } while (txq >= dev->real_num_tx_queues);
4574         }
4575         return txq;
4576 }
4577
4578 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
4579                                               struct sk_buff *skb,
4580                                               bool all_slaves)
4581 {
4582         struct bonding *bond = netdev_priv(master_dev);
4583         struct bond_up_slave *slaves;
4584         struct slave *slave = NULL;
4585
4586         switch (BOND_MODE(bond)) {
4587         case BOND_MODE_ROUNDROBIN:
4588                 slave = bond_xmit_roundrobin_slave_get(bond, skb);
4589                 break;
4590         case BOND_MODE_ACTIVEBACKUP:
4591                 slave = bond_xmit_activebackup_slave_get(bond, skb);
4592                 break;
4593         case BOND_MODE_8023AD:
4594         case BOND_MODE_XOR:
4595                 if (all_slaves)
4596                         slaves = rcu_dereference(bond->all_slaves);
4597                 else
4598                         slaves = rcu_dereference(bond->usable_slaves);
4599                 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4600                 break;
4601         case BOND_MODE_BROADCAST:
4602                 break;
4603         case BOND_MODE_ALB:
4604                 slave = bond_xmit_alb_slave_get(bond, skb);
4605                 break;
4606         case BOND_MODE_TLB:
4607                 slave = bond_xmit_tlb_slave_get(bond, skb);
4608                 break;
4609         default:
4610                 /* Should never happen, mode already checked */
4611                 WARN_ONCE(true, "Unknown bonding mode");
4612                 break;
4613         }
4614
4615         if (slave)
4616                 return slave->dev;
4617         return NULL;
4618 }
4619
4620 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow)
4621 {
4622         switch (sk->sk_family) {
4623 #if IS_ENABLED(CONFIG_IPV6)
4624         case AF_INET6:
4625                 if (sk->sk_ipv6only ||
4626                     ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) {
4627                         flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
4628                         flow->addrs.v6addrs.src = inet6_sk(sk)->saddr;
4629                         flow->addrs.v6addrs.dst = sk->sk_v6_daddr;
4630                         break;
4631                 }
4632                 fallthrough;
4633 #endif
4634         default: /* AF_INET */
4635                 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
4636                 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr;
4637                 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr;
4638                 break;
4639         }
4640
4641         flow->ports.src = inet_sk(sk)->inet_sport;
4642         flow->ports.dst = inet_sk(sk)->inet_dport;
4643 }
4644
4645 /**
4646  * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields
4647  * @sk: socket to use for headers
4648  *
4649  * This function will extract the necessary field from the socket and use
4650  * them to generate a hash based on the LAYER34 xmit_policy.
4651  * Assumes that sk is a TCP or UDP socket.
4652  */
4653 static u32 bond_sk_hash_l34(struct sock *sk)
4654 {
4655         struct flow_keys flow;
4656         u32 hash;
4657
4658         bond_sk_to_flow(sk, &flow);
4659
4660         /* L4 */
4661         memcpy(&hash, &flow.ports.ports, sizeof(hash));
4662         /* L3 */
4663         return bond_ip_hash(hash, &flow);
4664 }
4665
4666 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond,
4667                                                   struct sock *sk)
4668 {
4669         struct bond_up_slave *slaves;
4670         struct slave *slave;
4671         unsigned int count;
4672         u32 hash;
4673
4674         slaves = rcu_dereference(bond->usable_slaves);
4675         count = slaves ? READ_ONCE(slaves->count) : 0;
4676         if (unlikely(!count))
4677                 return NULL;
4678
4679         hash = bond_sk_hash_l34(sk);
4680         slave = slaves->arr[hash % count];
4681
4682         return slave->dev;
4683 }
4684
4685 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev,
4686                                                 struct sock *sk)
4687 {
4688         struct bonding *bond = netdev_priv(dev);
4689         struct net_device *lower = NULL;
4690
4691         rcu_read_lock();
4692         if (bond_sk_check(bond))
4693                 lower = __bond_sk_get_lower_dev(bond, sk);
4694         rcu_read_unlock();
4695
4696         return lower;
4697 }
4698
4699 #if IS_ENABLED(CONFIG_TLS_DEVICE)
4700 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb,
4701                                         struct net_device *dev)
4702 {
4703         if (likely(bond_get_slave_by_dev(bond, tls_get_ctx(skb->sk)->netdev)))
4704                 return bond_dev_queue_xmit(bond, skb, tls_get_ctx(skb->sk)->netdev);
4705         return bond_tx_drop(dev, skb);
4706 }
4707 #endif
4708
4709 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4710 {
4711         struct bonding *bond = netdev_priv(dev);
4712
4713         if (bond_should_override_tx_queue(bond) &&
4714             !bond_slave_override(bond, skb))
4715                 return NETDEV_TX_OK;
4716
4717 #if IS_ENABLED(CONFIG_TLS_DEVICE)
4718         if (skb->sk && tls_is_sk_tx_device_offloaded(skb->sk))
4719                 return bond_tls_device_xmit(bond, skb, dev);
4720 #endif
4721
4722         switch (BOND_MODE(bond)) {
4723         case BOND_MODE_ROUNDROBIN:
4724                 return bond_xmit_roundrobin(skb, dev);
4725         case BOND_MODE_ACTIVEBACKUP:
4726                 return bond_xmit_activebackup(skb, dev);
4727         case BOND_MODE_8023AD:
4728         case BOND_MODE_XOR:
4729                 return bond_3ad_xor_xmit(skb, dev);
4730         case BOND_MODE_BROADCAST:
4731                 return bond_xmit_broadcast(skb, dev);
4732         case BOND_MODE_ALB:
4733                 return bond_alb_xmit(skb, dev);
4734         case BOND_MODE_TLB:
4735                 return bond_tlb_xmit(skb, dev);
4736         default:
4737                 /* Should never happen, mode already checked */
4738                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4739                 WARN_ON_ONCE(1);
4740                 return bond_tx_drop(dev, skb);
4741         }
4742 }
4743
4744 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4745 {
4746         struct bonding *bond = netdev_priv(dev);
4747         netdev_tx_t ret = NETDEV_TX_OK;
4748
4749         /* If we risk deadlock from transmitting this in the
4750          * netpoll path, tell netpoll to queue the frame for later tx
4751          */
4752         if (unlikely(is_netpoll_tx_blocked(dev)))
4753                 return NETDEV_TX_BUSY;
4754
4755         rcu_read_lock();
4756         if (bond_has_slaves(bond))
4757                 ret = __bond_start_xmit(skb, dev);
4758         else
4759                 ret = bond_tx_drop(dev, skb);
4760         rcu_read_unlock();
4761
4762         return ret;
4763 }
4764
4765 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
4766 {
4767         if (speed == 0 || speed == SPEED_UNKNOWN)
4768                 speed = slave->speed;
4769         else
4770                 speed = min(speed, slave->speed);
4771
4772         return speed;
4773 }
4774
4775 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4776                                            struct ethtool_link_ksettings *cmd)
4777 {
4778         struct bonding *bond = netdev_priv(bond_dev);
4779         struct list_head *iter;
4780         struct slave *slave;
4781         u32 speed = 0;
4782
4783         cmd->base.duplex = DUPLEX_UNKNOWN;
4784         cmd->base.port = PORT_OTHER;
4785
4786         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4787          * do not need to check mode.  Though link speed might not represent
4788          * the true receive or transmit bandwidth (not all modes are symmetric)
4789          * this is an accurate maximum.
4790          */
4791         bond_for_each_slave(bond, slave, iter) {
4792                 if (bond_slave_can_tx(slave)) {
4793                         if (slave->speed != SPEED_UNKNOWN) {
4794                                 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
4795                                         speed = bond_mode_bcast_speed(slave,
4796                                                                       speed);
4797                                 else
4798                                         speed += slave->speed;
4799                         }
4800                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4801                             slave->duplex != DUPLEX_UNKNOWN)
4802                                 cmd->base.duplex = slave->duplex;
4803                 }
4804         }
4805         cmd->base.speed = speed ? : SPEED_UNKNOWN;
4806
4807         return 0;
4808 }
4809
4810 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4811                                      struct ethtool_drvinfo *drvinfo)
4812 {
4813         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4814         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4815                  BOND_ABI_VERSION);
4816 }
4817
4818 static const struct ethtool_ops bond_ethtool_ops = {
4819         .get_drvinfo            = bond_ethtool_get_drvinfo,
4820         .get_link               = ethtool_op_get_link,
4821         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4822 };
4823
4824 static const struct net_device_ops bond_netdev_ops = {
4825         .ndo_init               = bond_init,
4826         .ndo_uninit             = bond_uninit,
4827         .ndo_open               = bond_open,
4828         .ndo_stop               = bond_close,
4829         .ndo_start_xmit         = bond_start_xmit,
4830         .ndo_select_queue       = bond_select_queue,
4831         .ndo_get_stats64        = bond_get_stats,
4832         .ndo_do_ioctl           = bond_do_ioctl,
4833         .ndo_change_rx_flags    = bond_change_rx_flags,
4834         .ndo_set_rx_mode        = bond_set_rx_mode,
4835         .ndo_change_mtu         = bond_change_mtu,
4836         .ndo_set_mac_address    = bond_set_mac_address,
4837         .ndo_neigh_setup        = bond_neigh_setup,
4838         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4839         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4840 #ifdef CONFIG_NET_POLL_CONTROLLER
4841         .ndo_netpoll_setup      = bond_netpoll_setup,
4842         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4843         .ndo_poll_controller    = bond_poll_controller,
4844 #endif
4845         .ndo_add_slave          = bond_enslave,
4846         .ndo_del_slave          = bond_release,
4847         .ndo_fix_features       = bond_fix_features,
4848         .ndo_features_check     = passthru_features_check,
4849         .ndo_get_xmit_slave     = bond_xmit_get_slave,
4850         .ndo_sk_get_lower_dev   = bond_sk_get_lower_dev,
4851 };
4852
4853 static const struct device_type bond_type = {
4854         .name = "bond",
4855 };
4856
4857 static void bond_destructor(struct net_device *bond_dev)
4858 {
4859         struct bonding *bond = netdev_priv(bond_dev);
4860
4861         if (bond->wq)
4862                 destroy_workqueue(bond->wq);
4863
4864         if (bond->rr_tx_counter)
4865                 free_percpu(bond->rr_tx_counter);
4866 }
4867
4868 void bond_setup(struct net_device *bond_dev)
4869 {
4870         struct bonding *bond = netdev_priv(bond_dev);
4871
4872         spin_lock_init(&bond->mode_lock);
4873         bond->params = bonding_defaults;
4874
4875         /* Initialize pointers */
4876         bond->dev = bond_dev;
4877
4878         /* Initialize the device entry points */
4879         ether_setup(bond_dev);
4880         bond_dev->max_mtu = ETH_MAX_MTU;
4881         bond_dev->netdev_ops = &bond_netdev_ops;
4882         bond_dev->ethtool_ops = &bond_ethtool_ops;
4883
4884         bond_dev->needs_free_netdev = true;
4885         bond_dev->priv_destructor = bond_destructor;
4886
4887         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4888
4889         /* Initialize the device options */
4890         bond_dev->flags |= IFF_MASTER;
4891         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4892         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4893
4894 #ifdef CONFIG_XFRM_OFFLOAD
4895         /* set up xfrm device ops (only supported in active-backup right now) */
4896         bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
4897         bond->xs = NULL;
4898 #endif /* CONFIG_XFRM_OFFLOAD */
4899
4900         /* don't acquire bond device's netif_tx_lock when transmitting */
4901         bond_dev->features |= NETIF_F_LLTX;
4902
4903         /* By default, we declare the bond to be fully
4904          * VLAN hardware accelerated capable. Special
4905          * care is taken in the various xmit functions
4906          * when there are slaves that are not hw accel
4907          * capable
4908          */
4909
4910         /* Don't allow bond devices to change network namespaces. */
4911         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4912
4913         bond_dev->hw_features = BOND_VLAN_FEATURES |
4914                                 NETIF_F_HW_VLAN_CTAG_RX |
4915                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4916
4917         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4918         bond_dev->features |= bond_dev->hw_features;
4919         bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4920 #ifdef CONFIG_XFRM_OFFLOAD
4921         bond_dev->hw_features |= BOND_XFRM_FEATURES;
4922         /* Only enable XFRM features if this is an active-backup config */
4923         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4924                 bond_dev->features |= BOND_XFRM_FEATURES;
4925 #endif /* CONFIG_XFRM_OFFLOAD */
4926 #if IS_ENABLED(CONFIG_TLS_DEVICE)
4927         if (bond_sk_check(bond))
4928                 bond_dev->features |= BOND_TLS_FEATURES;
4929 #endif
4930 }
4931
4932 /* Destroy a bonding device.
4933  * Must be under rtnl_lock when this function is called.
4934  */
4935 static void bond_uninit(struct net_device *bond_dev)
4936 {
4937         struct bonding *bond = netdev_priv(bond_dev);
4938         struct bond_up_slave *usable, *all;
4939         struct list_head *iter;
4940         struct slave *slave;
4941
4942         bond_netpoll_cleanup(bond_dev);
4943
4944         /* Release the bonded slaves */
4945         bond_for_each_slave(bond, slave, iter)
4946                 __bond_release_one(bond_dev, slave->dev, true, true);
4947         netdev_info(bond_dev, "Released all slaves\n");
4948
4949         usable = rtnl_dereference(bond->usable_slaves);
4950         if (usable) {
4951                 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4952                 kfree_rcu(usable, rcu);
4953         }
4954
4955         all = rtnl_dereference(bond->all_slaves);
4956         if (all) {
4957                 RCU_INIT_POINTER(bond->all_slaves, NULL);
4958                 kfree_rcu(all, rcu);
4959         }
4960
4961         list_del(&bond->bond_list);
4962
4963         bond_debug_unregister(bond);
4964 }
4965
4966 /*------------------------- Module initialization ---------------------------*/
4967
4968 static int bond_check_params(struct bond_params *params)
4969 {
4970         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4971         struct bond_opt_value newval;
4972         const struct bond_opt_value *valptr;
4973         int arp_all_targets_value = 0;
4974         u16 ad_actor_sys_prio = 0;
4975         u16 ad_user_port_key = 0;
4976         __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4977         int arp_ip_count;
4978         int bond_mode   = BOND_MODE_ROUNDROBIN;
4979         int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4980         int lacp_fast = 0;
4981         int tlb_dynamic_lb;
4982
4983         /* Convert string parameters. */
4984         if (mode) {
4985                 bond_opt_initstr(&newval, mode);
4986                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4987                 if (!valptr) {
4988                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4989                         return -EINVAL;
4990                 }
4991                 bond_mode = valptr->value;
4992         }
4993
4994         if (xmit_hash_policy) {
4995                 if (bond_mode == BOND_MODE_ROUNDROBIN ||
4996                     bond_mode == BOND_MODE_ACTIVEBACKUP ||
4997                     bond_mode == BOND_MODE_BROADCAST) {
4998                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4999                                 bond_mode_name(bond_mode));
5000                 } else {
5001                         bond_opt_initstr(&newval, xmit_hash_policy);
5002                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
5003                                                 &newval);
5004                         if (!valptr) {
5005                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
5006                                        xmit_hash_policy);
5007                                 return -EINVAL;
5008                         }
5009                         xmit_hashtype = valptr->value;
5010                 }
5011         }
5012
5013         if (lacp_rate) {
5014                 if (bond_mode != BOND_MODE_8023AD) {
5015                         pr_info("lacp_rate param is irrelevant in mode %s\n",
5016                                 bond_mode_name(bond_mode));
5017                 } else {
5018                         bond_opt_initstr(&newval, lacp_rate);
5019                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
5020                                                 &newval);
5021                         if (!valptr) {
5022                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
5023                                        lacp_rate);
5024                                 return -EINVAL;
5025                         }
5026                         lacp_fast = valptr->value;
5027                 }
5028         }
5029
5030         if (ad_select) {
5031                 bond_opt_initstr(&newval, ad_select);
5032                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
5033                                         &newval);
5034                 if (!valptr) {
5035                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
5036                         return -EINVAL;
5037                 }
5038                 params->ad_select = valptr->value;
5039                 if (bond_mode != BOND_MODE_8023AD)
5040                         pr_warn("ad_select param only affects 802.3ad mode\n");
5041         } else {
5042                 params->ad_select = BOND_AD_STABLE;
5043         }
5044
5045         if (max_bonds < 0) {
5046                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
5047                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
5048                 max_bonds = BOND_DEFAULT_MAX_BONDS;
5049         }
5050
5051         if (miimon < 0) {
5052                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5053                         miimon, INT_MAX);
5054                 miimon = 0;
5055         }
5056
5057         if (updelay < 0) {
5058                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5059                         updelay, INT_MAX);
5060                 updelay = 0;
5061         }
5062
5063         if (downdelay < 0) {
5064                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5065                         downdelay, INT_MAX);
5066                 downdelay = 0;
5067         }
5068
5069         if ((use_carrier != 0) && (use_carrier != 1)) {
5070                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
5071                         use_carrier);
5072                 use_carrier = 1;
5073         }
5074
5075         if (num_peer_notif < 0 || num_peer_notif > 255) {
5076                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
5077                         num_peer_notif);
5078                 num_peer_notif = 1;
5079         }
5080
5081         /* reset values for 802.3ad/TLB/ALB */
5082         if (!bond_mode_uses_arp(bond_mode)) {
5083                 if (!miimon) {
5084                         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");
5085                         pr_warn("Forcing miimon to 100msec\n");
5086                         miimon = BOND_DEFAULT_MIIMON;
5087                 }
5088         }
5089
5090         if (tx_queues < 1 || tx_queues > 255) {
5091                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
5092                         tx_queues, BOND_DEFAULT_TX_QUEUES);
5093                 tx_queues = BOND_DEFAULT_TX_QUEUES;
5094         }
5095
5096         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
5097                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
5098                         all_slaves_active);
5099                 all_slaves_active = 0;
5100         }
5101
5102         if (resend_igmp < 0 || resend_igmp > 255) {
5103                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
5104                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
5105                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
5106         }
5107
5108         bond_opt_initval(&newval, packets_per_slave);
5109         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
5110                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
5111                         packets_per_slave, USHRT_MAX);
5112                 packets_per_slave = 1;
5113         }
5114
5115         if (bond_mode == BOND_MODE_ALB) {
5116                 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",
5117                           updelay);
5118         }
5119
5120         if (!miimon) {
5121                 if (updelay || downdelay) {
5122                         /* just warn the user the up/down delay will have
5123                          * no effect since miimon is zero...
5124                          */
5125                         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",
5126                                 updelay, downdelay);
5127                 }
5128         } else {
5129                 /* don't allow arp monitoring */
5130                 if (arp_interval) {
5131                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
5132                                 miimon, arp_interval);
5133                         arp_interval = 0;
5134                 }
5135
5136                 if ((updelay % miimon) != 0) {
5137                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
5138                                 updelay, miimon, (updelay / miimon) * miimon);
5139                 }
5140
5141                 updelay /= miimon;
5142
5143                 if ((downdelay % miimon) != 0) {
5144                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
5145                                 downdelay, miimon,
5146                                 (downdelay / miimon) * miimon);
5147                 }
5148
5149                 downdelay /= miimon;
5150         }
5151
5152         if (arp_interval < 0) {
5153                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5154                         arp_interval, INT_MAX);
5155                 arp_interval = 0;
5156         }
5157
5158         for (arp_ip_count = 0, i = 0;
5159              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
5160                 __be32 ip;
5161
5162                 /* not a complete check, but good enough to catch mistakes */
5163                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
5164                     !bond_is_ip_target_ok(ip)) {
5165                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
5166                                 arp_ip_target[i]);
5167                         arp_interval = 0;
5168                 } else {
5169                         if (bond_get_targets_ip(arp_target, ip) == -1)
5170                                 arp_target[arp_ip_count++] = ip;
5171                         else
5172                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
5173                                         &ip);
5174                 }
5175         }
5176
5177         if (arp_interval && !arp_ip_count) {
5178                 /* don't allow arping if no arp_ip_target given... */
5179                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
5180                         arp_interval);
5181                 arp_interval = 0;
5182         }
5183
5184         if (arp_validate) {
5185                 if (!arp_interval) {
5186                         pr_err("arp_validate requires arp_interval\n");
5187                         return -EINVAL;
5188                 }
5189
5190                 bond_opt_initstr(&newval, arp_validate);
5191                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
5192                                         &newval);
5193                 if (!valptr) {
5194                         pr_err("Error: invalid arp_validate \"%s\"\n",
5195                                arp_validate);
5196                         return -EINVAL;
5197                 }
5198                 arp_validate_value = valptr->value;
5199         } else {
5200                 arp_validate_value = 0;
5201         }
5202
5203         if (arp_all_targets) {
5204                 bond_opt_initstr(&newval, arp_all_targets);
5205                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
5206                                         &newval);
5207                 if (!valptr) {
5208                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
5209                                arp_all_targets);
5210                         arp_all_targets_value = 0;
5211                 } else {
5212                         arp_all_targets_value = valptr->value;
5213                 }
5214         }
5215
5216         if (miimon) {
5217                 pr_info("MII link monitoring set to %d ms\n", miimon);
5218         } else if (arp_interval) {
5219                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
5220                                           arp_validate_value);
5221                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5222                         arp_interval, valptr->string, arp_ip_count);
5223
5224                 for (i = 0; i < arp_ip_count; i++)
5225                         pr_cont(" %s", arp_ip_target[i]);
5226
5227                 pr_cont("\n");
5228
5229         } else if (max_bonds) {
5230                 /* miimon and arp_interval not set, we need one so things
5231                  * work as expected, see bonding.txt for details
5232                  */
5233                 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");
5234         }
5235
5236         if (primary && !bond_mode_uses_primary(bond_mode)) {
5237                 /* currently, using a primary only makes sense
5238                  * in active backup, TLB or ALB modes
5239                  */
5240                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
5241                         primary, bond_mode_name(bond_mode));
5242                 primary = NULL;
5243         }
5244
5245         if (primary && primary_reselect) {
5246                 bond_opt_initstr(&newval, primary_reselect);
5247                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
5248                                         &newval);
5249                 if (!valptr) {
5250                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
5251                                primary_reselect);
5252                         return -EINVAL;
5253                 }
5254                 primary_reselect_value = valptr->value;
5255         } else {
5256                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5257         }
5258
5259         if (fail_over_mac) {
5260                 bond_opt_initstr(&newval, fail_over_mac);
5261                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
5262                                         &newval);
5263                 if (!valptr) {
5264                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
5265                                fail_over_mac);
5266                         return -EINVAL;
5267                 }
5268                 fail_over_mac_value = valptr->value;
5269                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5270                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
5271         } else {
5272                 fail_over_mac_value = BOND_FOM_NONE;
5273         }
5274
5275         bond_opt_initstr(&newval, "default");
5276         valptr = bond_opt_parse(
5277                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
5278                                      &newval);
5279         if (!valptr) {
5280                 pr_err("Error: No ad_actor_sys_prio default value");
5281                 return -EINVAL;
5282         }
5283         ad_actor_sys_prio = valptr->value;
5284
5285         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
5286                                 &newval);
5287         if (!valptr) {
5288                 pr_err("Error: No ad_user_port_key default value");
5289                 return -EINVAL;
5290         }
5291         ad_user_port_key = valptr->value;
5292
5293         bond_opt_initstr(&newval, "default");
5294         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
5295         if (!valptr) {
5296                 pr_err("Error: No tlb_dynamic_lb default value");
5297                 return -EINVAL;
5298         }
5299         tlb_dynamic_lb = valptr->value;
5300
5301         if (lp_interval == 0) {
5302                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
5303                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
5304                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
5305         }
5306
5307         /* fill params struct with the proper values */
5308         params->mode = bond_mode;
5309         params->xmit_policy = xmit_hashtype;
5310         params->miimon = miimon;
5311         params->num_peer_notif = num_peer_notif;
5312         params->arp_interval = arp_interval;
5313         params->arp_validate = arp_validate_value;
5314         params->arp_all_targets = arp_all_targets_value;
5315         params->updelay = updelay;
5316         params->downdelay = downdelay;
5317         params->peer_notif_delay = 0;
5318         params->use_carrier = use_carrier;
5319         params->lacp_fast = lacp_fast;
5320         params->primary[0] = 0;
5321         params->primary_reselect = primary_reselect_value;
5322         params->fail_over_mac = fail_over_mac_value;
5323         params->tx_queues = tx_queues;
5324         params->all_slaves_active = all_slaves_active;
5325         params->resend_igmp = resend_igmp;
5326         params->min_links = min_links;
5327         params->lp_interval = lp_interval;
5328         params->packets_per_slave = packets_per_slave;
5329         params->tlb_dynamic_lb = tlb_dynamic_lb;
5330         params->ad_actor_sys_prio = ad_actor_sys_prio;
5331         eth_zero_addr(params->ad_actor_system);
5332         params->ad_user_port_key = ad_user_port_key;
5333         if (packets_per_slave > 0) {
5334                 params->reciprocal_packets_per_slave =
5335                         reciprocal_value(packets_per_slave);
5336         } else {
5337                 /* reciprocal_packets_per_slave is unused if
5338                  * packets_per_slave is 0 or 1, just initialize it
5339                  */
5340                 params->reciprocal_packets_per_slave =
5341                         (struct reciprocal_value) { 0 };
5342         }
5343
5344         if (primary)
5345                 strscpy_pad(params->primary, primary, sizeof(params->primary));
5346
5347         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5348
5349         return 0;
5350 }
5351
5352 /* Called from registration process */
5353 static int bond_init(struct net_device *bond_dev)
5354 {
5355         struct bonding *bond = netdev_priv(bond_dev);
5356         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5357
5358         netdev_dbg(bond_dev, "Begin bond_init\n");
5359
5360         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
5361         if (!bond->wq)
5362                 return -ENOMEM;
5363
5364         if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN) {
5365                 bond->rr_tx_counter = alloc_percpu(u32);
5366                 if (!bond->rr_tx_counter) {
5367                         destroy_workqueue(bond->wq);
5368                         bond->wq = NULL;
5369                         return -ENOMEM;
5370                 }
5371         }
5372
5373         spin_lock_init(&bond->stats_lock);
5374         netdev_lockdep_set_classes(bond_dev);
5375
5376         list_add_tail(&bond->bond_list, &bn->dev_list);
5377
5378         bond_prepare_sysfs_group(bond);
5379
5380         bond_debug_register(bond);
5381
5382         /* Ensure valid dev_addr */
5383         if (is_zero_ether_addr(bond_dev->dev_addr) &&
5384             bond_dev->addr_assign_type == NET_ADDR_PERM)
5385                 eth_hw_addr_random(bond_dev);
5386
5387         return 0;
5388 }
5389
5390 unsigned int bond_get_num_tx_queues(void)
5391 {
5392         return tx_queues;
5393 }
5394
5395 /* Create a new bond based on the specified name and bonding parameters.
5396  * If name is NULL, obtain a suitable "bond%d" name for us.
5397  * Caller must NOT hold rtnl_lock; we need to release it here before we
5398  * set up our sysfs entries.
5399  */
5400 int bond_create(struct net *net, const char *name)
5401 {
5402         struct net_device *bond_dev;
5403         struct bonding *bond;
5404         struct alb_bond_info *bond_info;
5405         int res;
5406
5407         rtnl_lock();
5408
5409         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
5410                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
5411                                    bond_setup, tx_queues);
5412         if (!bond_dev) {
5413                 pr_err("%s: eek! can't alloc netdev!\n", name);
5414                 rtnl_unlock();
5415                 return -ENOMEM;
5416         }
5417
5418         /*
5419          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
5420          * It is set to 0 by default which is wrong.
5421          */
5422         bond = netdev_priv(bond_dev);
5423         bond_info = &(BOND_ALB_INFO(bond));
5424         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
5425
5426         dev_net_set(bond_dev, net);
5427         bond_dev->rtnl_link_ops = &bond_link_ops;
5428
5429         res = register_netdevice(bond_dev);
5430         if (res < 0) {
5431                 free_netdev(bond_dev);
5432                 rtnl_unlock();
5433
5434                 return res;
5435         }
5436
5437         netif_carrier_off(bond_dev);
5438
5439         bond_work_init_all(bond);
5440
5441         rtnl_unlock();
5442         return 0;
5443 }
5444
5445 static int __net_init bond_net_init(struct net *net)
5446 {
5447         struct bond_net *bn = net_generic(net, bond_net_id);
5448
5449         bn->net = net;
5450         INIT_LIST_HEAD(&bn->dev_list);
5451
5452         bond_create_proc_dir(bn);
5453         bond_create_sysfs(bn);
5454
5455         return 0;
5456 }
5457
5458 static void __net_exit bond_net_exit(struct net *net)
5459 {
5460         struct bond_net *bn = net_generic(net, bond_net_id);
5461         struct bonding *bond, *tmp_bond;
5462         LIST_HEAD(list);
5463
5464         bond_destroy_sysfs(bn);
5465
5466         /* Kill off any bonds created after unregistering bond rtnl ops */
5467         rtnl_lock();
5468         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
5469                 unregister_netdevice_queue(bond->dev, &list);
5470         unregister_netdevice_many(&list);
5471         rtnl_unlock();
5472
5473         bond_destroy_proc_dir(bn);
5474 }
5475
5476 static struct pernet_operations bond_net_ops = {
5477         .init = bond_net_init,
5478         .exit = bond_net_exit,
5479         .id   = &bond_net_id,
5480         .size = sizeof(struct bond_net),
5481 };
5482
5483 static int __init bonding_init(void)
5484 {
5485         int i;
5486         int res;
5487
5488         res = bond_check_params(&bonding_defaults);
5489         if (res)
5490                 goto out;
5491
5492         res = register_pernet_subsys(&bond_net_ops);
5493         if (res)
5494                 goto out;
5495
5496         res = bond_netlink_init();
5497         if (res)
5498                 goto err_link;
5499
5500         bond_create_debugfs();
5501
5502         for (i = 0; i < max_bonds; i++) {
5503                 res = bond_create(&init_net, NULL);
5504                 if (res)
5505                         goto err;
5506         }
5507
5508         skb_flow_dissector_init(&flow_keys_bonding,
5509                                 flow_keys_bonding_keys,
5510                                 ARRAY_SIZE(flow_keys_bonding_keys));
5511
5512         register_netdevice_notifier(&bond_netdev_notifier);
5513 out:
5514         return res;
5515 err:
5516         bond_destroy_debugfs();
5517         bond_netlink_fini();
5518 err_link:
5519         unregister_pernet_subsys(&bond_net_ops);
5520         goto out;
5521
5522 }
5523
5524 static void __exit bonding_exit(void)
5525 {
5526         unregister_netdevice_notifier(&bond_netdev_notifier);
5527
5528         bond_destroy_debugfs();
5529
5530         bond_netlink_fini();
5531         unregister_pernet_subsys(&bond_net_ops);
5532
5533 #ifdef CONFIG_NET_POLL_CONTROLLER
5534         /* Make sure we don't have an imbalance on our netpoll blocking */
5535         WARN_ON(atomic_read(&netpoll_block_tx));
5536 #endif
5537 }
5538
5539 module_init(bonding_init);
5540 module_exit(bonding_exit);
5541 MODULE_LICENSE("GPL");
5542 MODULE_DESCRIPTION(DRV_DESCRIPTION);
5543 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");