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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/ptrace.h>
  42 #include <linux/ioport.h>
  43 #include <linux/in.h>
  44 #include <net/ip.h>
  45 #include <linux/ip.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 "bonding.h"
  80 #include "bond_3ad.h"
  81 #include "bond_alb.h"
  82
  83 /*---------------------------- Module parameters ----------------------------*/
  84
  85 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  86 #define BOND_LINK_MON_INTERV    0
  87 #define BOND_LINK_ARP_INTERV    0
  88
  89 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  90 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  91 static int num_peer_notif = 1;
  92 static int miimon       = BOND_LINK_MON_INTERV;
  93 static int updelay;
  94 static int downdelay;
  95 static int use_carrier  = 1;
  96 static char *mode;
  97 static char *primary;
  98 static char *primary_reselect;
  99 static char *lacp_rate;
 100 static int min_links;
 101 static char *ad_select;
 102 static char *xmit_hash_policy;
 103 static int arp_interval = BOND_LINK_ARP_INTERV;
 104 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 105 static char *arp_validate;
 106 static char *fail_over_mac;
 107 static int all_slaves_active = 0;
 108 static struct bond_params bonding_defaults;
 109 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 110
 111 module_param(max_bonds, int, 0);
 112 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 113 module_param(tx_queues, int, 0);
 114 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 115 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 116 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 117                                "failover event (alias of num_unsol_na)");
 118 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 119 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 120                                "failover event (alias of num_grat_arp)");
 121 module_param(miimon, int, 0);
 122 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 123 module_param(updelay, int, 0);
 124 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 125 module_param(downdelay, int, 0);
 126 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 127                             "in milliseconds");
 128 module_param(use_carrier, int, 0);
 129 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 130                               "0 for off, 1 for on (default)");
 131 module_param(mode, charp, 0);
 132 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 133                        "1 for active-backup, 2 for balance-xor, "
 134                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 135                        "6 for balance-alb");
 136 module_param(primary, charp, 0);
 137 MODULE_PARM_DESC(primary, "Primary network device to use");
 138 module_param(primary_reselect, charp, 0);
 139 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 140                                    "once it comes up; "
 141                                    "0 for always (default), "
 142                                    "1 for only if speed of primary is "
 143                                    "better, "
 144                                    "2 for only on active slave "
 145                                    "failure");
 146 module_param(lacp_rate, charp, 0);
 147 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 148                             "0 for slow, 1 for fast");
 149 module_param(ad_select, charp, 0);
 150 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 151                             "0 for stable (default), 1 for bandwidth, "
 152                             "2 for count");
 153 module_param(min_links, int, 0);
 154 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 155
 156 module_param(xmit_hash_policy, charp, 0);
 157 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 158                                    "0 for layer 2 (default), 1 for layer 3+4, "
 159                                    "2 for layer 2+3");
 160 module_param(arp_interval, int, 0);
 161 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 162 module_param_array(arp_ip_target, charp, NULL, 0);
 163 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 164 module_param(arp_validate, charp, 0);
 165 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 166                                "0 for none (default), 1 for active, "
 167                                "2 for backup, 3 for all");
 168 module_param(fail_over_mac, charp, 0);
 169 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 170                                 "the same MAC; 0 for none (default), "
 171                                 "1 for active, 2 for follow");
 172 module_param(all_slaves_active, int, 0);
 173 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 174                                      "by setting active flag for all slaves; "
 175                                      "0 for never (default), 1 for always.");
 176 module_param(resend_igmp, int, 0);
 177 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 178                               "link failure");
 179
 180 /*----------------------------- Global variables ----------------------------*/
 181
 182 #ifdef CONFIG_NET_POLL_CONTROLLER
 183 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 184 #endif
 185
 186 int bond_net_id __read_mostly;
 187
 188 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 189 static int arp_ip_count;
 190 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 191 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 192 static int lacp_fast;
 193
 194 const struct bond_parm_tbl bond_lacp_tbl[] = {
 195 {       "slow",         AD_LACP_SLOW},
 196 {       "fast",         AD_LACP_FAST},
 197 {       NULL,           -1},
 198 };
 199
 200 const struct bond_parm_tbl bond_mode_tbl[] = {
 201 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 202 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 203 {       "balance-xor",          BOND_MODE_XOR},
 204 {       "broadcast",            BOND_MODE_BROADCAST},
 205 {       "802.3ad",              BOND_MODE_8023AD},
 206 {       "balance-tlb",          BOND_MODE_TLB},
 207 {       "balance-alb",          BOND_MODE_ALB},
 208 {       NULL,                   -1},
 209 };
 210
 211 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 212 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 213 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 214 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 215 {       NULL,                   -1},
 216 };
 217
 218 const struct bond_parm_tbl arp_validate_tbl[] = {
 219 {       "none",                 BOND_ARP_VALIDATE_NONE},
 220 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 221 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 222 {       "all",                  BOND_ARP_VALIDATE_ALL},
 223 {       NULL,                   -1},
 224 };
 225
 226 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 227 {       "none",                 BOND_FOM_NONE},
 228 {       "active",               BOND_FOM_ACTIVE},
 229 {       "follow",               BOND_FOM_FOLLOW},
 230 {       NULL,                   -1},
 231 };
 232
 233 const struct bond_parm_tbl pri_reselect_tbl[] = {
 234 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 235 {       "better",               BOND_PRI_RESELECT_BETTER},
 236 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 237 {       NULL,                   -1},
 238 };
 239
 240 struct bond_parm_tbl ad_select_tbl[] = {
 241 {       "stable",       BOND_AD_STABLE},
 242 {       "bandwidth",    BOND_AD_BANDWIDTH},
 243 {       "count",        BOND_AD_COUNT},
 244 {       NULL,           -1},
 245 };
 246
 247 /*-------------------------- Forward declarations ---------------------------*/
 248
 249 static int bond_init(struct net_device *bond_dev);
 250 static void bond_uninit(struct net_device *bond_dev);
 251
 252 /*---------------------------- General routines -----------------------------*/
 253
 254 const char *bond_mode_name(int mode)
 255 {
 256         static const char *names[] = {
 257                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 258                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 259                 [BOND_MODE_XOR] = "load balancing (xor)",
 260                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 261                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 262                 [BOND_MODE_TLB] = "transmit load balancing",
 263                 [BOND_MODE_ALB] = "adaptive load balancing",
 264         };
 265
 266         if (mode < 0 || mode > BOND_MODE_ALB)
 267                 return "unknown";
 268
 269         return names[mode];
 270 }
 271
 272 /*---------------------------------- VLAN -----------------------------------*/
 273
 274 /**
 275  * bond_add_vlan - add a new vlan id on bond
 276  * @bond: bond that got the notification
 277  * @vlan_id: the vlan id to add
 278  *
 279  * Returns -ENOMEM if allocation failed.
 280  */
 281 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 282 {
 283         struct vlan_entry *vlan;
 284
 285         pr_debug("bond: %s, vlan id %d\n",
 286                  (bond ? bond->dev->name : "None"), vlan_id);
 287
 288         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 289         if (!vlan)
 290                 return -ENOMEM;
 291
 292         INIT_LIST_HEAD(&vlan->vlan_list);
 293         vlan->vlan_id = vlan_id;
 294
 295         write_lock_bh(&bond->lock);
 296
 297         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 298
 299         write_unlock_bh(&bond->lock);
 300
 301         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 302
 303         return 0;
 304 }
 305
 306 /**
 307  * bond_del_vlan - delete a vlan id from bond
 308  * @bond: bond that got the notification
 309  * @vlan_id: the vlan id to delete
 310  *
 311  * returns -ENODEV if @vlan_id was not found in @bond.
 312  */
 313 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 314 {
 315         struct vlan_entry *vlan;
 316         int res = -ENODEV;
 317
 318         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 319
 320         block_netpoll_tx();
 321         write_lock_bh(&bond->lock);
 322
 323         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 324                 if (vlan->vlan_id == vlan_id) {
 325                         list_del(&vlan->vlan_list);
 326
 327                         if (bond_is_lb(bond))
 328                                 bond_alb_clear_vlan(bond, vlan_id);
 329
 330                         pr_debug("removed VLAN ID %d from bond %s\n",
 331                                  vlan_id, bond->dev->name);
 332
 333                         kfree(vlan);
 334
 335                         res = 0;
 336                         goto out;
 337                 }
 338         }
 339
 340         pr_debug("couldn't find VLAN ID %d in bond %s\n",
 341                  vlan_id, bond->dev->name);
 342
 343 out:
 344         write_unlock_bh(&bond->lock);
 345         unblock_netpoll_tx();
 346         return res;
 347 }
 348
 349 /**
 350  * bond_next_vlan - safely skip to the next item in the vlans list.
 351  * @bond: the bond we're working on
 352  * @curr: item we're advancing from
 353  *
 354  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 355  * or @curr->next otherwise (even if it is @curr itself again).
 356  *
 357  * Caller must hold bond->lock
 358  */
 359 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 360 {
 361         struct vlan_entry *next, *last;
 362
 363         if (list_empty(&bond->vlan_list))
 364                 return NULL;
 365
 366         if (!curr) {
 367                 next = list_entry(bond->vlan_list.next,
 368                                   struct vlan_entry, vlan_list);
 369         } else {
 370                 last = list_entry(bond->vlan_list.prev,
 371                                   struct vlan_entry, vlan_list);
 372                 if (last == curr) {
 373                         next = list_entry(bond->vlan_list.next,
 374                                           struct vlan_entry, vlan_list);
 375                 } else {
 376                         next = list_entry(curr->vlan_list.next,
 377                                           struct vlan_entry, vlan_list);
 378                 }
 379         }
 380
 381         return next;
 382 }
 383
 384 #define bond_queue_mapping(skb) (*(u16 *)((skb)->cb))
 385
 386 /**
 387  * bond_dev_queue_xmit - Prepare skb for xmit.
 388  *
 389  * @bond: bond device that got this skb for tx.
 390  * @skb: hw accel VLAN tagged skb to transmit
 391  * @slave_dev: slave that is supposed to xmit this skbuff
 392  */
 393 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 394                         struct net_device *slave_dev)
 395 {
 396         skb->dev = slave_dev;
 397
 398         skb->queue_mapping = bond_queue_mapping(skb);
 399
 400         if (unlikely(netpoll_tx_running(slave_dev)))
 401                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 402         else
 403                 dev_queue_xmit(skb);
 404
 405         return 0;
 406 }
 407
 408 /*
 409  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 410  * We don't protect the slave list iteration with a lock because:
 411  * a. This operation is performed in IOCTL context,
 412  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 413  * c. Holding a lock with BH disabled while directly calling a base driver
 414  *    entry point is generally a BAD idea.
 415  *
 416  * The design of synchronization/protection for this operation in the 8021q
 417  * module is good for one or more VLAN devices over a single physical device
 418  * and cannot be extended for a teaming solution like bonding, so there is a
 419  * potential race condition here where a net device from the vlan group might
 420  * be referenced (either by a base driver or the 8021q code) while it is being
 421  * removed from the system. However, it turns out we're not making matters
 422  * worse, and if it works for regular VLAN usage it will work here too.
 423 */
 424
 425 /**
 426  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 427  * @bond_dev: bonding net device that got called
 428  * @vid: vlan id being added
 429  */
 430 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 431 {
 432         struct bonding *bond = netdev_priv(bond_dev);
 433         struct slave *slave, *stop_at;
 434         int i, res;
 435
 436         bond_for_each_slave(bond, slave, i) {
 437                 res = vlan_vid_add(slave->dev, vid);
 438                 if (res)
 439                         goto unwind;
 440         }
 441
 442         res = bond_add_vlan(bond, vid);
 443         if (res) {
 444                 pr_err("%s: Error: Failed to add vlan id %d\n",
 445                        bond_dev->name, vid);
 446                 return res;
 447         }
 448
 449         return 0;
 450
 451 unwind:
 452         /* unwind from head to the slave that failed */
 453         stop_at = slave;
 454         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at)
 455                 vlan_vid_del(slave->dev, vid);
 456
 457         return res;
 458 }
 459
 460 /**
 461  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 462  * @bond_dev: bonding net device that got called
 463  * @vid: vlan id being removed
 464  */
 465 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 466 {
 467         struct bonding *bond = netdev_priv(bond_dev);
 468         struct slave *slave;
 469         int i, res;
 470
 471         bond_for_each_slave(bond, slave, i)
 472                 vlan_vid_del(slave->dev, vid);
 473
 474         res = bond_del_vlan(bond, vid);
 475         if (res) {
 476                 pr_err("%s: Error: Failed to remove vlan id %d\n",
 477                        bond_dev->name, vid);
 478                 return res;
 479         }
 480
 481         return 0;
 482 }
 483
 484 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 485 {
 486         struct vlan_entry *vlan;
 487         int res;
 488
 489         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 490                 res = vlan_vid_add(slave_dev, vlan->vlan_id);
 491                 if (res)
 492                         pr_warning("%s: Failed to add vlan id %d to device %s\n",
 493                                    bond->dev->name, vlan->vlan_id,
 494                                    slave_dev->name);
 495         }
 496 }
 497
 498 static void bond_del_vlans_from_slave(struct bonding *bond,
 499                                       struct net_device *slave_dev)
 500 {
 501         struct vlan_entry *vlan;
 502
 503         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 504                 if (!vlan->vlan_id)
 505                         continue;
 506                 vlan_vid_del(slave_dev, vlan->vlan_id);
 507         }
 508 }
 509
 510 /*------------------------------- Link status -------------------------------*/
 511
 512 /*
 513  * Set the carrier state for the master according to the state of its
 514  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 515  * do special 802.3ad magic.
 516  *
 517  * Returns zero if carrier state does not change, nonzero if it does.
 518  */
 519 static int bond_set_carrier(struct bonding *bond)
 520 {
 521         struct slave *slave;
 522         int i;
 523
 524         if (bond->slave_cnt == 0)
 525                 goto down;
 526
 527         if (bond->params.mode == BOND_MODE_8023AD)
 528                 return bond_3ad_set_carrier(bond);
 529
 530         bond_for_each_slave(bond, slave, i) {
 531                 if (slave->link == BOND_LINK_UP) {
 532                         if (!netif_carrier_ok(bond->dev)) {
 533                                 netif_carrier_on(bond->dev);
 534                                 return 1;
 535                         }
 536                         return 0;
 537                 }
 538         }
 539
 540 down:
 541         if (netif_carrier_ok(bond->dev)) {
 542                 netif_carrier_off(bond->dev);
 543                 return 1;
 544         }
 545         return 0;
 546 }
 547
 548 /*
 549  * Get link speed and duplex from the slave's base driver
 550  * using ethtool. If for some reason the call fails or the
 551  * values are invalid, set speed and duplex to -1,
 552  * and return error.
 553  */
 554 static int bond_update_speed_duplex(struct slave *slave)
 555 {
 556         struct net_device *slave_dev = slave->dev;
 557         struct ethtool_cmd ecmd;
 558         u32 slave_speed;
 559         int res;
 560
 561         slave->speed = SPEED_UNKNOWN;
 562         slave->duplex = DUPLEX_UNKNOWN;
 563
 564         res = __ethtool_get_settings(slave_dev, &ecmd);
 565         if (res < 0)
 566                 return -1;
 567
 568         slave_speed = ethtool_cmd_speed(&ecmd);
 569         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 570                 return -1;
 571
 572         switch (ecmd.duplex) {
 573         case DUPLEX_FULL:
 574         case DUPLEX_HALF:
 575                 break;
 576         default:
 577                 return -1;
 578         }
 579
 580         slave->speed = slave_speed;
 581         slave->duplex = ecmd.duplex;
 582
 583         return 0;
 584 }
 585
 586 /*
 587  * if <dev> supports MII link status reporting, check its link status.
 588  *
 589  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 590  * depending upon the setting of the use_carrier parameter.
 591  *
 592  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 593  * can't tell and just pretend it is), or 0, meaning that the link is
 594  * down.
 595  *
 596  * If reporting is non-zero, instead of faking link up, return -1 if
 597  * both ETHTOOL and MII ioctls fail (meaning the device does not
 598  * support them).  If use_carrier is set, return whatever it says.
 599  * It'd be nice if there was a good way to tell if a driver supports
 600  * netif_carrier, but there really isn't.
 601  */
 602 static int bond_check_dev_link(struct bonding *bond,
 603                                struct net_device *slave_dev, int reporting)
 604 {
 605         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 606         int (*ioctl)(struct net_device *, struct ifreq *, int);
 607         struct ifreq ifr;
 608         struct mii_ioctl_data *mii;
 609
 610         if (!reporting && !netif_running(slave_dev))
 611                 return 0;
 612
 613         if (bond->params.use_carrier)
 614                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 615
 616         /* Try to get link status using Ethtool first. */
 617         if (slave_dev->ethtool_ops) {
 618                 if (slave_dev->ethtool_ops->get_link) {
 619                         u32 link;
 620
 621                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 622
 623                         return link ? BMSR_LSTATUS : 0;
 624                 }
 625         }
 626
 627         /* Ethtool can't be used, fallback to MII ioctls. */
 628         ioctl = slave_ops->ndo_do_ioctl;
 629         if (ioctl) {
 630                 /* TODO: set pointer to correct ioctl on a per team member */
 631                 /*       bases to make this more efficient. that is, once  */
 632                 /*       we determine the correct ioctl, we will always    */
 633                 /*       call it and not the others for that team          */
 634                 /*       member.                                           */
 635
 636                 /*
 637                  * We cannot assume that SIOCGMIIPHY will also read a
 638                  * register; not all network drivers (e.g., e100)
 639                  * support that.
 640                  */
 641
 642                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 643                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 644                 mii = if_mii(&ifr);
 645                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 646                         mii->reg_num = MII_BMSR;
 647                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 648                                 return mii->val_out & BMSR_LSTATUS;
 649                 }
 650         }
 651
 652         /*
 653          * If reporting, report that either there's no dev->do_ioctl,
 654          * or both SIOCGMIIREG and get_link failed (meaning that we
 655          * cannot report link status).  If not reporting, pretend
 656          * we're ok.
 657          */
 658         return reporting ? -1 : BMSR_LSTATUS;
 659 }
 660
 661 /*----------------------------- Multicast list ------------------------------*/
 662
 663 /*
 664  * Push the promiscuity flag down to appropriate slaves
 665  */
 666 static int bond_set_promiscuity(struct bonding *bond, int inc)
 667 {
 668         int err = 0;
 669         if (USES_PRIMARY(bond->params.mode)) {
 670                 /* write lock already acquired */
 671                 if (bond->curr_active_slave) {
 672                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 673                                                   inc);
 674                 }
 675         } else {
 676                 struct slave *slave;
 677                 int i;
 678                 bond_for_each_slave(bond, slave, i) {
 679                         err = dev_set_promiscuity(slave->dev, inc);
 680                         if (err)
 681                                 return err;
 682                 }
 683         }
 684         return err;
 685 }
 686
 687 /*
 688  * Push the allmulti flag down to all slaves
 689  */
 690 static int bond_set_allmulti(struct bonding *bond, int inc)
 691 {
 692         int err = 0;
 693         if (USES_PRIMARY(bond->params.mode)) {
 694                 /* write lock already acquired */
 695                 if (bond->curr_active_slave) {
 696                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 697                                                inc);
 698                 }
 699         } else {
 700                 struct slave *slave;
 701                 int i;
 702                 bond_for_each_slave(bond, slave, i) {
 703                         err = dev_set_allmulti(slave->dev, inc);
 704                         if (err)
 705                                 return err;
 706                 }
 707         }
 708         return err;
 709 }
 710
 711 /*
 712  * Add a Multicast address to slaves
 713  * according to mode
 714  */
 715 static void bond_mc_add(struct bonding *bond, void *addr)
 716 {
 717         if (USES_PRIMARY(bond->params.mode)) {
 718                 /* write lock already acquired */
 719                 if (bond->curr_active_slave)
 720                         dev_mc_add(bond->curr_active_slave->dev, addr);
 721         } else {
 722                 struct slave *slave;
 723                 int i;
 724
 725                 bond_for_each_slave(bond, slave, i)
 726                         dev_mc_add(slave->dev, addr);
 727         }
 728 }
 729
 730 /*
 731  * Remove a multicast address from slave
 732  * according to mode
 733  */
 734 static void bond_mc_del(struct bonding *bond, void *addr)
 735 {
 736         if (USES_PRIMARY(bond->params.mode)) {
 737                 /* write lock already acquired */
 738                 if (bond->curr_active_slave)
 739                         dev_mc_del(bond->curr_active_slave->dev, addr);
 740         } else {
 741                 struct slave *slave;
 742                 int i;
 743                 bond_for_each_slave(bond, slave, i) {
 744                         dev_mc_del(slave->dev, addr);
 745                 }
 746         }
 747 }
 748
 749
 750 static void __bond_resend_igmp_join_requests(struct net_device *dev)
 751 {
 752         struct in_device *in_dev;
 753
 754         rcu_read_lock();
 755         in_dev = __in_dev_get_rcu(dev);
 756         if (in_dev)
 757                 ip_mc_rejoin_groups(in_dev);
 758         rcu_read_unlock();
 759 }
 760
 761 /*
 762  * Retrieve the list of registered multicast addresses for the bonding
 763  * device and retransmit an IGMP JOIN request to the current active
 764  * slave.
 765  */
 766 static void bond_resend_igmp_join_requests(struct bonding *bond)
 767 {
 768         struct net_device *bond_dev, *vlan_dev, *master_dev;
 769         struct vlan_entry *vlan;
 770
 771         read_lock(&bond->lock);
 772
 773         bond_dev = bond->dev;
 774
 775         /* rejoin all groups on bond device */
 776         __bond_resend_igmp_join_requests(bond_dev);
 777
 778         /*
 779          * if bond is enslaved to a bridge,
 780          * then rejoin all groups on its master
 781          */
 782         master_dev = bond_dev->master;
 783         if (master_dev)
 784                 if ((master_dev->priv_flags & IFF_EBRIDGE)
 785                         && (bond_dev->priv_flags & IFF_BRIDGE_PORT))
 786                         __bond_resend_igmp_join_requests(master_dev);
 787
 788         /* rejoin all groups on vlan devices */
 789         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 790                 rcu_read_lock();
 791                 vlan_dev = __vlan_find_dev_deep(bond_dev,
 792                                                 vlan->vlan_id);
 793                 rcu_read_unlock();
 794                 if (vlan_dev)
 795                         __bond_resend_igmp_join_requests(vlan_dev);
 796         }
 797
 798         if (--bond->igmp_retrans > 0)
 799                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 800
 801         read_unlock(&bond->lock);
 802 }
 803
 804 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 805 {
 806         struct bonding *bond = container_of(work, struct bonding,
 807                                             mcast_work.work);
 808         bond_resend_igmp_join_requests(bond);
 809 }
 810
 811 /*
 812  * flush all members of flush->mc_list from device dev->mc_list
 813  */
 814 static void bond_mc_list_flush(struct net_device *bond_dev,
 815                                struct net_device *slave_dev)
 816 {
 817         struct bonding *bond = netdev_priv(bond_dev);
 818         struct netdev_hw_addr *ha;
 819
 820         netdev_for_each_mc_addr(ha, bond_dev)
 821                 dev_mc_del(slave_dev, ha->addr);
 822
 823         if (bond->params.mode == BOND_MODE_8023AD) {
 824                 /* del lacpdu mc addr from mc list */
 825                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 826
 827                 dev_mc_del(slave_dev, lacpdu_multicast);
 828         }
 829 }
 830
 831 /*--------------------------- Active slave change ---------------------------*/
 832
 833 /*
 834  * Update the mc list and multicast-related flags for the new and
 835  * old active slaves (if any) according to the multicast mode, and
 836  * promiscuous flags unconditionally.
 837  */
 838 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
 839                          struct slave *old_active)
 840 {
 841         struct netdev_hw_addr *ha;
 842
 843         if (!USES_PRIMARY(bond->params.mode))
 844                 /* nothing to do -  mc list is already up-to-date on
 845                  * all slaves
 846                  */
 847                 return;
 848
 849         if (old_active) {
 850                 if (bond->dev->flags & IFF_PROMISC)
 851                         dev_set_promiscuity(old_active->dev, -1);
 852
 853                 if (bond->dev->flags & IFF_ALLMULTI)
 854                         dev_set_allmulti(old_active->dev, -1);
 855
 856                 netdev_for_each_mc_addr(ha, bond->dev)
 857                         dev_mc_del(old_active->dev, ha->addr);
 858         }
 859
 860         if (new_active) {
 861                 /* FIXME: Signal errors upstream. */
 862                 if (bond->dev->flags & IFF_PROMISC)
 863                         dev_set_promiscuity(new_active->dev, 1);
 864
 865                 if (bond->dev->flags & IFF_ALLMULTI)
 866                         dev_set_allmulti(new_active->dev, 1);
 867
 868                 netdev_for_each_mc_addr(ha, bond->dev)
 869                         dev_mc_add(new_active->dev, ha->addr);
 870         }
 871 }
 872
 873 /*
 874  * bond_do_fail_over_mac
 875  *
 876  * Perform special MAC address swapping for fail_over_mac settings
 877  *
 878  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 879  */
 880 static void bond_do_fail_over_mac(struct bonding *bond,
 881                                   struct slave *new_active,
 882                                   struct slave *old_active)
 883         __releases(&bond->curr_slave_lock)
 884         __releases(&bond->lock)
 885         __acquires(&bond->lock)
 886         __acquires(&bond->curr_slave_lock)
 887 {
 888         u8 tmp_mac[ETH_ALEN];
 889         struct sockaddr saddr;
 890         int rv;
 891
 892         switch (bond->params.fail_over_mac) {
 893         case BOND_FOM_ACTIVE:
 894                 if (new_active) {
 895                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
 896                                new_active->dev->addr_len);
 897                         write_unlock_bh(&bond->curr_slave_lock);
 898                         read_unlock(&bond->lock);
 899                         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
 900                         read_lock(&bond->lock);
 901                         write_lock_bh(&bond->curr_slave_lock);
 902                 }
 903                 break;
 904         case BOND_FOM_FOLLOW:
 905                 /*
 906                  * if new_active && old_active, swap them
 907                  * if just old_active, do nothing (going to no active slave)
 908                  * if just new_active, set new_active to bond's MAC
 909                  */
 910                 if (!new_active)
 911                         return;
 912
 913                 write_unlock_bh(&bond->curr_slave_lock);
 914                 read_unlock(&bond->lock);
 915
 916                 if (old_active) {
 917                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 918                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 919                                ETH_ALEN);
 920                         saddr.sa_family = new_active->dev->type;
 921                 } else {
 922                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 923                         saddr.sa_family = bond->dev->type;
 924                 }
 925
 926                 rv = dev_set_mac_address(new_active->dev, &saddr);
 927                 if (rv) {
 928                         pr_err("%s: Error %d setting MAC of slave %s\n",
 929                                bond->dev->name, -rv, new_active->dev->name);
 930                         goto out;
 931                 }
 932
 933                 if (!old_active)
 934                         goto out;
 935
 936                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
 937                 saddr.sa_family = old_active->dev->type;
 938
 939                 rv = dev_set_mac_address(old_active->dev, &saddr);
 940                 if (rv)
 941                         pr_err("%s: Error %d setting MAC of slave %s\n",
 942                                bond->dev->name, -rv, new_active->dev->name);
 943 out:
 944                 read_lock(&bond->lock);
 945                 write_lock_bh(&bond->curr_slave_lock);
 946                 break;
 947         default:
 948                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
 949                        bond->dev->name, bond->params.fail_over_mac);
 950                 break;
 951         }
 952
 953 }
 954
 955 static bool bond_should_change_active(struct bonding *bond)
 956 {
 957         struct slave *prim = bond->primary_slave;
 958         struct slave *curr = bond->curr_active_slave;
 959
 960         if (!prim || !curr || curr->link != BOND_LINK_UP)
 961                 return true;
 962         if (bond->force_primary) {
 963                 bond->force_primary = false;
 964                 return true;
 965         }
 966         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 967             (prim->speed < curr->speed ||
 968              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 969                 return false;
 970         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 971                 return false;
 972         return true;
 973 }
 974
 975 /**
 976  * find_best_interface - select the best available slave to be the active one
 977  * @bond: our bonding struct
 978  *
 979  * Warning: Caller must hold curr_slave_lock for writing.
 980  */
 981 static struct slave *bond_find_best_slave(struct bonding *bond)
 982 {
 983         struct slave *new_active, *old_active;
 984         struct slave *bestslave = NULL;
 985         int mintime = bond->params.updelay;
 986         int i;
 987
 988         new_active = bond->curr_active_slave;
 989
 990         if (!new_active) { /* there were no active slaves left */
 991                 if (bond->slave_cnt > 0)   /* found one slave */
 992                         new_active = bond->first_slave;
 993                 else
 994                         return NULL; /* still no slave, return NULL */
 995         }
 996
 997         if ((bond->primary_slave) &&
 998             bond->primary_slave->link == BOND_LINK_UP &&
 999             bond_should_change_active(bond)) {
1000                 new_active = bond->primary_slave;
1001         }
1002
1003         /* remember where to stop iterating over the slaves */
1004         old_active = new_active;
1005
1006         bond_for_each_slave_from(bond, new_active, i, old_active) {
1007                 if (new_active->link == BOND_LINK_UP) {
1008                         return new_active;
1009                 } else if (new_active->link == BOND_LINK_BACK &&
1010                            IS_UP(new_active->dev)) {
1011                         /* link up, but waiting for stabilization */
1012                         if (new_active->delay < mintime) {
1013                                 mintime = new_active->delay;
1014                                 bestslave = new_active;
1015                         }
1016                 }
1017         }
1018
1019         return bestslave;
1020 }
1021
1022 static bool bond_should_notify_peers(struct bonding *bond)
1023 {
1024         struct slave *slave = bond->curr_active_slave;
1025
1026         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1027                  bond->dev->name, slave ? slave->dev->name : "NULL");
1028
1029         if (!slave || !bond->send_peer_notif ||
1030             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1031                 return false;
1032
1033         bond->send_peer_notif--;
1034         return true;
1035 }
1036
1037 /**
1038  * change_active_interface - change the active slave into the specified one
1039  * @bond: our bonding struct
1040  * @new: the new slave to make the active one
1041  *
1042  * Set the new slave to the bond's settings and unset them on the old
1043  * curr_active_slave.
1044  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1045  *
1046  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1047  * because it is apparently the best available slave we have, even though its
1048  * updelay hasn't timed out yet.
1049  *
1050  * If new_active is not NULL, caller must hold bond->lock for read and
1051  * curr_slave_lock for write_bh.
1052  */
1053 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1054 {
1055         struct slave *old_active = bond->curr_active_slave;
1056
1057         if (old_active == new_active)
1058                 return;
1059
1060         if (new_active) {
1061                 new_active->jiffies = jiffies;
1062
1063                 if (new_active->link == BOND_LINK_BACK) {
1064                         if (USES_PRIMARY(bond->params.mode)) {
1065                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1066                                         bond->dev->name, new_active->dev->name,
1067                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1068                         }
1069
1070                         new_active->delay = 0;
1071                         new_active->link = BOND_LINK_UP;
1072
1073                         if (bond->params.mode == BOND_MODE_8023AD)
1074                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1075
1076                         if (bond_is_lb(bond))
1077                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1078                 } else {
1079                         if (USES_PRIMARY(bond->params.mode)) {
1080                                 pr_info("%s: making interface %s the new active one.\n",
1081                                         bond->dev->name, new_active->dev->name);
1082                         }
1083                 }
1084         }
1085
1086         if (USES_PRIMARY(bond->params.mode))
1087                 bond_mc_swap(bond, new_active, old_active);
1088
1089         if (bond_is_lb(bond)) {
1090                 bond_alb_handle_active_change(bond, new_active);
1091                 if (old_active)
1092                         bond_set_slave_inactive_flags(old_active);
1093                 if (new_active)
1094                         bond_set_slave_active_flags(new_active);
1095         } else {
1096                 bond->curr_active_slave = new_active;
1097         }
1098
1099         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1100                 if (old_active)
1101                         bond_set_slave_inactive_flags(old_active);
1102
1103                 if (new_active) {
1104                         bool should_notify_peers = false;
1105
1106                         bond_set_slave_active_flags(new_active);
1107
1108                         if (bond->params.fail_over_mac)
1109                                 bond_do_fail_over_mac(bond, new_active,
1110                                                       old_active);
1111
1112                         if (netif_running(bond->dev)) {
1113                                 bond->send_peer_notif =
1114                                         bond->params.num_peer_notif;
1115                                 should_notify_peers =
1116                                         bond_should_notify_peers(bond);
1117                         }
1118
1119                         write_unlock_bh(&bond->curr_slave_lock);
1120                         read_unlock(&bond->lock);
1121
1122                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1123                         if (should_notify_peers)
1124                                 netdev_bonding_change(bond->dev,
1125                                                       NETDEV_NOTIFY_PEERS);
1126
1127                         read_lock(&bond->lock);
1128                         write_lock_bh(&bond->curr_slave_lock);
1129                 }
1130         }
1131
1132         /* resend IGMP joins since active slave has changed or
1133          * all were sent on curr_active_slave.
1134          * resend only if bond is brought up with the affected
1135          * bonding modes and the retransmission is enabled */
1136         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1137             ((USES_PRIMARY(bond->params.mode) && new_active) ||
1138              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1139                 bond->igmp_retrans = bond->params.resend_igmp;
1140                 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1141         }
1142 }
1143
1144 /**
1145  * bond_select_active_slave - select a new active slave, if needed
1146  * @bond: our bonding struct
1147  *
1148  * This functions should be called when one of the following occurs:
1149  * - The old curr_active_slave has been released or lost its link.
1150  * - The primary_slave has got its link back.
1151  * - A slave has got its link back and there's no old curr_active_slave.
1152  *
1153  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1154  */
1155 void bond_select_active_slave(struct bonding *bond)
1156 {
1157         struct slave *best_slave;
1158         int rv;
1159
1160         best_slave = bond_find_best_slave(bond);
1161         if (best_slave != bond->curr_active_slave) {
1162                 bond_change_active_slave(bond, best_slave);
1163                 rv = bond_set_carrier(bond);
1164                 if (!rv)
1165                         return;
1166
1167                 if (netif_carrier_ok(bond->dev)) {
1168                         pr_info("%s: first active interface up!\n",
1169                                 bond->dev->name);
1170                 } else {
1171                         pr_info("%s: now running without any active interface !\n",
1172                                 bond->dev->name);
1173                 }
1174         }
1175 }
1176
1177 /*--------------------------- slave list handling ---------------------------*/
1178
1179 /*
1180  * This function attaches the slave to the end of list.
1181  *
1182  * bond->lock held for writing by caller.
1183  */
1184 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1185 {
1186         if (bond->first_slave == NULL) { /* attaching the first slave */
1187                 new_slave->next = new_slave;
1188                 new_slave->prev = new_slave;
1189                 bond->first_slave = new_slave;
1190         } else {
1191                 new_slave->next = bond->first_slave;
1192                 new_slave->prev = bond->first_slave->prev;
1193                 new_slave->next->prev = new_slave;
1194                 new_slave->prev->next = new_slave;
1195         }
1196
1197         bond->slave_cnt++;
1198 }
1199
1200 /*
1201  * This function detaches the slave from the list.
1202  * WARNING: no check is made to verify if the slave effectively
1203  * belongs to <bond>.
1204  * Nothing is freed on return, structures are just unchained.
1205  * If any slave pointer in bond was pointing to <slave>,
1206  * it should be changed by the calling function.
1207  *
1208  * bond->lock held for writing by caller.
1209  */
1210 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1211 {
1212         if (slave->next)
1213                 slave->next->prev = slave->prev;
1214
1215         if (slave->prev)
1216                 slave->prev->next = slave->next;
1217
1218         if (bond->first_slave == slave) { /* slave is the first slave */
1219                 if (bond->slave_cnt > 1) { /* there are more slave */
1220                         bond->first_slave = slave->next;
1221                 } else {
1222                         bond->first_slave = NULL; /* slave was the last one */
1223                 }
1224         }
1225
1226         slave->next = NULL;
1227         slave->prev = NULL;
1228         bond->slave_cnt--;
1229 }
1230
1231 #ifdef CONFIG_NET_POLL_CONTROLLER
1232 static inline int slave_enable_netpoll(struct slave *slave)
1233 {
1234         struct netpoll *np;
1235         int err = 0;
1236
1237         np = kzalloc(sizeof(*np), GFP_KERNEL);
1238         err = -ENOMEM;
1239         if (!np)
1240                 goto out;
1241
1242         np->dev = slave->dev;
1243         strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ);
1244         err = __netpoll_setup(np);
1245         if (err) {
1246                 kfree(np);
1247                 goto out;
1248         }
1249         slave->np = np;
1250 out:
1251         return err;
1252 }
1253 static inline void slave_disable_netpoll(struct slave *slave)
1254 {
1255         struct netpoll *np = slave->np;
1256
1257         if (!np)
1258                 return;
1259
1260         slave->np = NULL;
1261         synchronize_rcu_bh();
1262         __netpoll_cleanup(np);
1263         kfree(np);
1264 }
1265 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1266 {
1267         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1268                 return false;
1269         if (!slave_dev->netdev_ops->ndo_poll_controller)
1270                 return false;
1271         return true;
1272 }
1273
1274 static void bond_poll_controller(struct net_device *bond_dev)
1275 {
1276 }
1277
1278 static void __bond_netpoll_cleanup(struct bonding *bond)
1279 {
1280         struct slave *slave;
1281         int i;
1282
1283         bond_for_each_slave(bond, slave, i)
1284                 if (IS_UP(slave->dev))
1285                         slave_disable_netpoll(slave);
1286 }
1287 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1288 {
1289         struct bonding *bond = netdev_priv(bond_dev);
1290
1291         read_lock(&bond->lock);
1292         __bond_netpoll_cleanup(bond);
1293         read_unlock(&bond->lock);
1294 }
1295
1296 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1297 {
1298         struct bonding *bond = netdev_priv(dev);
1299         struct slave *slave;
1300         int i, err = 0;
1301
1302         read_lock(&bond->lock);
1303         bond_for_each_slave(bond, slave, i) {
1304                 err = slave_enable_netpoll(slave);
1305                 if (err) {
1306                         __bond_netpoll_cleanup(bond);
1307                         break;
1308                 }
1309         }
1310         read_unlock(&bond->lock);
1311         return err;
1312 }
1313
1314 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1315 {
1316         return bond->dev->npinfo;
1317 }
1318
1319 #else
1320 static inline int slave_enable_netpoll(struct slave *slave)
1321 {
1322         return 0;
1323 }
1324 static inline void slave_disable_netpoll(struct slave *slave)
1325 {
1326 }
1327 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1328 {
1329 }
1330 #endif
1331
1332 /*---------------------------------- IOCTL ----------------------------------*/
1333
1334 static int bond_sethwaddr(struct net_device *bond_dev,
1335                           struct net_device *slave_dev)
1336 {
1337         pr_debug("bond_dev=%p\n", bond_dev);
1338         pr_debug("slave_dev=%p\n", slave_dev);
1339         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1340         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1341         return 0;
1342 }
1343
1344 static netdev_features_t bond_fix_features(struct net_device *dev,
1345         netdev_features_t features)
1346 {
1347         struct slave *slave;
1348         struct bonding *bond = netdev_priv(dev);
1349         netdev_features_t mask;
1350         int i;
1351
1352         read_lock(&bond->lock);
1353
1354         if (!bond->first_slave) {
1355                 /* Disable adding VLANs to empty bond. But why? --mq */
1356                 features |= NETIF_F_VLAN_CHALLENGED;
1357                 goto out;
1358         }
1359
1360         mask = features;
1361         features &= ~NETIF_F_ONE_FOR_ALL;
1362         features |= NETIF_F_ALL_FOR_ALL;
1363
1364         bond_for_each_slave(bond, slave, i) {
1365                 features = netdev_increment_features(features,
1366                                                      slave->dev->features,
1367                                                      mask);
1368         }
1369
1370 out:
1371         read_unlock(&bond->lock);
1372         return features;
1373 }
1374
1375 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1376                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1377                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1378
1379 static void bond_compute_features(struct bonding *bond)
1380 {
1381         struct slave *slave;
1382         struct net_device *bond_dev = bond->dev;
1383         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1384         unsigned short max_hard_header_len = ETH_HLEN;
1385         int i;
1386
1387         read_lock(&bond->lock);
1388
1389         if (!bond->first_slave)
1390                 goto done;
1391
1392         bond_for_each_slave(bond, slave, i) {
1393                 vlan_features = netdev_increment_features(vlan_features,
1394                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1395
1396                 if (slave->dev->hard_header_len > max_hard_header_len)
1397                         max_hard_header_len = slave->dev->hard_header_len;
1398         }
1399
1400 done:
1401         bond_dev->vlan_features = vlan_features;
1402         bond_dev->hard_header_len = max_hard_header_len;
1403
1404         read_unlock(&bond->lock);
1405
1406         netdev_change_features(bond_dev);
1407 }
1408
1409 static void bond_setup_by_slave(struct net_device *bond_dev,
1410                                 struct net_device *slave_dev)
1411 {
1412         struct bonding *bond = netdev_priv(bond_dev);
1413
1414         bond_dev->header_ops        = slave_dev->header_ops;
1415
1416         bond_dev->type              = slave_dev->type;
1417         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1418         bond_dev->addr_len          = slave_dev->addr_len;
1419
1420         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1421                 slave_dev->addr_len);
1422         bond->setup_by_slave = 1;
1423 }
1424
1425 /* On bonding slaves other than the currently active slave, suppress
1426  * duplicates except for alb non-mcast/bcast.
1427  */
1428 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1429                                             struct slave *slave,
1430                                             struct bonding *bond)
1431 {
1432         if (bond_is_slave_inactive(slave)) {
1433                 if (bond->params.mode == BOND_MODE_ALB &&
1434                     skb->pkt_type != PACKET_BROADCAST &&
1435                     skb->pkt_type != PACKET_MULTICAST)
1436                         return false;
1437                 return true;
1438         }
1439         return false;
1440 }
1441
1442 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1443 {
1444         struct sk_buff *skb = *pskb;
1445         struct slave *slave;
1446         struct bonding *bond;
1447         int (*recv_probe)(struct sk_buff *, struct bonding *,
1448                                 struct slave *);
1449         int ret = RX_HANDLER_ANOTHER;
1450
1451         skb = skb_share_check(skb, GFP_ATOMIC);
1452         if (unlikely(!skb))
1453                 return RX_HANDLER_CONSUMED;
1454
1455         *pskb = skb;
1456
1457         slave = bond_slave_get_rcu(skb->dev);
1458         bond = slave->bond;
1459
1460         if (bond->params.arp_interval)
1461                 slave->dev->last_rx = jiffies;
1462
1463         recv_probe = ACCESS_ONCE(bond->recv_probe);
1464         if (recv_probe) {
1465                 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1466
1467                 if (likely(nskb)) {
1468                         ret = recv_probe(nskb, bond, slave);
1469                         dev_kfree_skb(nskb);
1470                         if (ret == RX_HANDLER_CONSUMED) {
1471                                 consume_skb(skb);
1472                                 return ret;
1473                         }
1474                 }
1475         }
1476
1477         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1478                 return RX_HANDLER_EXACT;
1479         }
1480
1481         skb->dev = bond->dev;
1482
1483         if (bond->params.mode == BOND_MODE_ALB &&
1484             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1485             skb->pkt_type == PACKET_HOST) {
1486
1487                 if (unlikely(skb_cow_head(skb,
1488                                           skb->data - skb_mac_header(skb)))) {
1489                         kfree_skb(skb);
1490                         return RX_HANDLER_CONSUMED;
1491                 }
1492                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1493         }
1494
1495         return ret;
1496 }
1497
1498 /* enslave device <slave> to bond device <master> */
1499 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1500 {
1501         struct bonding *bond = netdev_priv(bond_dev);
1502         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1503         struct slave *new_slave = NULL;
1504         struct netdev_hw_addr *ha;
1505         struct sockaddr addr;
1506         int link_reporting;
1507         int res = 0;
1508
1509         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1510                 slave_ops->ndo_do_ioctl == NULL) {
1511                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1512                            bond_dev->name, slave_dev->name);
1513         }
1514
1515         /* already enslaved */
1516         if (slave_dev->flags & IFF_SLAVE) {
1517                 pr_debug("Error, Device was already enslaved\n");
1518                 return -EBUSY;
1519         }
1520
1521         /* vlan challenged mutual exclusion */
1522         /* no need to lock since we're protected by rtnl_lock */
1523         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1524                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1525                 if (bond_vlan_used(bond)) {
1526                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1527                                bond_dev->name, slave_dev->name, bond_dev->name);
1528                         return -EPERM;
1529                 } else {
1530                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1531                                    bond_dev->name, slave_dev->name,
1532                                    slave_dev->name, bond_dev->name);
1533                 }
1534         } else {
1535                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1536         }
1537
1538         /*
1539          * Old ifenslave binaries are no longer supported.  These can
1540          * be identified with moderate accuracy by the state of the slave:
1541          * the current ifenslave will set the interface down prior to
1542          * enslaving it; the old ifenslave will not.
1543          */
1544         if ((slave_dev->flags & IFF_UP)) {
1545                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1546                        slave_dev->name);
1547                 res = -EPERM;
1548                 goto err_undo_flags;
1549         }
1550
1551         /* set bonding device ether type by slave - bonding netdevices are
1552          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1553          * there is a need to override some of the type dependent attribs/funcs.
1554          *
1555          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1556          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1557          */
1558         if (bond->slave_cnt == 0) {
1559                 if (bond_dev->type != slave_dev->type) {
1560                         pr_debug("%s: change device type from %d to %d\n",
1561                                  bond_dev->name,
1562                                  bond_dev->type, slave_dev->type);
1563
1564                         res = netdev_bonding_change(bond_dev,
1565                                                     NETDEV_PRE_TYPE_CHANGE);
1566                         res = notifier_to_errno(res);
1567                         if (res) {
1568                                 pr_err("%s: refused to change device type\n",
1569                                        bond_dev->name);
1570                                 res = -EBUSY;
1571                                 goto err_undo_flags;
1572                         }
1573
1574                         /* Flush unicast and multicast addresses */
1575                         dev_uc_flush(bond_dev);
1576                         dev_mc_flush(bond_dev);
1577
1578                         if (slave_dev->type != ARPHRD_ETHER)
1579                                 bond_setup_by_slave(bond_dev, slave_dev);
1580                         else {
1581                                 ether_setup(bond_dev);
1582                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1583                         }
1584
1585                         netdev_bonding_change(bond_dev,
1586                                               NETDEV_POST_TYPE_CHANGE);
1587                 }
1588         } else if (bond_dev->type != slave_dev->type) {
1589                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1590                        slave_dev->name,
1591                        slave_dev->type, bond_dev->type);
1592                 res = -EINVAL;
1593                 goto err_undo_flags;
1594         }
1595
1596         if (slave_ops->ndo_set_mac_address == NULL) {
1597                 if (bond->slave_cnt == 0) {
1598                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1599                                    bond_dev->name);
1600                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1601                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1602                         pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n",
1603                                bond_dev->name);
1604                         res = -EOPNOTSUPP;
1605                         goto err_undo_flags;
1606                 }
1607         }
1608
1609         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1610
1611         /* If this is the first slave, then we need to set the master's hardware
1612          * address to be the same as the slave's. */
1613         if (is_zero_ether_addr(bond->dev->dev_addr))
1614                 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1615                        slave_dev->addr_len);
1616
1617
1618         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1619         if (!new_slave) {
1620                 res = -ENOMEM;
1621                 goto err_undo_flags;
1622         }
1623
1624         /*
1625          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1626          * is set via sysfs or module option if desired.
1627          */
1628         new_slave->queue_id = 0;
1629
1630         /* Save slave's original mtu and then set it to match the bond */
1631         new_slave->original_mtu = slave_dev->mtu;
1632         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1633         if (res) {
1634                 pr_debug("Error %d calling dev_set_mtu\n", res);
1635                 goto err_free;
1636         }
1637
1638         /*
1639          * Save slave's original ("permanent") mac address for modes
1640          * that need it, and for restoring it upon release, and then
1641          * set it to the master's address
1642          */
1643         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1644
1645         if (!bond->params.fail_over_mac) {
1646                 /*
1647                  * Set slave to master's mac address.  The application already
1648                  * set the master's mac address to that of the first slave
1649                  */
1650                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1651                 addr.sa_family = slave_dev->type;
1652                 res = dev_set_mac_address(slave_dev, &addr);
1653                 if (res) {
1654                         pr_debug("Error %d calling set_mac_address\n", res);
1655                         goto err_restore_mtu;
1656                 }
1657         }
1658
1659         res = netdev_set_bond_master(slave_dev, bond_dev);
1660         if (res) {
1661                 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1662                 goto err_restore_mac;
1663         }
1664
1665         /* open the slave since the application closed it */
1666         res = dev_open(slave_dev);
1667         if (res) {
1668                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1669                 goto err_unset_master;
1670         }
1671
1672         new_slave->bond = bond;
1673         new_slave->dev = slave_dev;
1674         slave_dev->priv_flags |= IFF_BONDING;
1675
1676         if (bond_is_lb(bond)) {
1677                 /* bond_alb_init_slave() must be called before all other stages since
1678                  * it might fail and we do not want to have to undo everything
1679                  */
1680                 res = bond_alb_init_slave(bond, new_slave);
1681                 if (res)
1682                         goto err_close;
1683         }
1684
1685         /* If the mode USES_PRIMARY, then the new slave gets the
1686          * master's promisc (and mc) settings only if it becomes the
1687          * curr_active_slave, and that is taken care of later when calling
1688          * bond_change_active()
1689          */
1690         if (!USES_PRIMARY(bond->params.mode)) {
1691                 /* set promiscuity level to new slave */
1692                 if (bond_dev->flags & IFF_PROMISC) {
1693                         res = dev_set_promiscuity(slave_dev, 1);
1694                         if (res)
1695                                 goto err_close;
1696                 }
1697
1698                 /* set allmulti level to new slave */
1699                 if (bond_dev->flags & IFF_ALLMULTI) {
1700                         res = dev_set_allmulti(slave_dev, 1);
1701                         if (res)
1702                                 goto err_close;
1703                 }
1704
1705                 netif_addr_lock_bh(bond_dev);
1706                 /* upload master's mc_list to new slave */
1707                 netdev_for_each_mc_addr(ha, bond_dev)
1708                         dev_mc_add(slave_dev, ha->addr);
1709                 netif_addr_unlock_bh(bond_dev);
1710         }
1711
1712         if (bond->params.mode == BOND_MODE_8023AD) {
1713                 /* add lacpdu mc addr to mc list */
1714                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1715
1716                 dev_mc_add(slave_dev, lacpdu_multicast);
1717         }
1718
1719         bond_add_vlans_on_slave(bond, slave_dev);
1720
1721         write_lock_bh(&bond->lock);
1722
1723         bond_attach_slave(bond, new_slave);
1724
1725         new_slave->delay = 0;
1726         new_slave->link_failure_count = 0;
1727
1728         write_unlock_bh(&bond->lock);
1729
1730         bond_compute_features(bond);
1731
1732         read_lock(&bond->lock);
1733
1734         new_slave->last_arp_rx = jiffies;
1735
1736         if (bond->params.miimon && !bond->params.use_carrier) {
1737                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1738
1739                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1740                         /*
1741                          * miimon is set but a bonded network driver
1742                          * does not support ETHTOOL/MII and
1743                          * arp_interval is not set.  Note: if
1744                          * use_carrier is enabled, we will never go
1745                          * here (because netif_carrier is always
1746                          * supported); thus, we don't need to change
1747                          * the messages for netif_carrier.
1748                          */
1749                         pr_warning("%s: Warning: MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details.\n",
1750                                bond_dev->name, slave_dev->name);
1751                 } else if (link_reporting == -1) {
1752                         /* unable get link status using mii/ethtool */
1753                         pr_warning("%s: Warning: can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface.\n",
1754                                    bond_dev->name, slave_dev->name);
1755                 }
1756         }
1757
1758         /* check for initial state */
1759         if (!bond->params.miimon ||
1760             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1761                 if (bond->params.updelay) {
1762                         pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1763                         new_slave->link  = BOND_LINK_BACK;
1764                         new_slave->delay = bond->params.updelay;
1765                 } else {
1766                         pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1767                         new_slave->link  = BOND_LINK_UP;
1768                 }
1769                 new_slave->jiffies = jiffies;
1770         } else {
1771                 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1772                 new_slave->link  = BOND_LINK_DOWN;
1773         }
1774
1775         bond_update_speed_duplex(new_slave);
1776
1777         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1778                 /* if there is a primary slave, remember it */
1779                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1780                         bond->primary_slave = new_slave;
1781                         bond->force_primary = true;
1782                 }
1783         }
1784
1785         write_lock_bh(&bond->curr_slave_lock);
1786
1787         switch (bond->params.mode) {
1788         case BOND_MODE_ACTIVEBACKUP:
1789                 bond_set_slave_inactive_flags(new_slave);
1790                 bond_select_active_slave(bond);
1791                 break;
1792         case BOND_MODE_8023AD:
1793                 /* in 802.3ad mode, the internal mechanism
1794                  * will activate the slaves in the selected
1795                  * aggregator
1796                  */
1797                 bond_set_slave_inactive_flags(new_slave);
1798                 /* if this is the first slave */
1799                 if (bond->slave_cnt == 1) {
1800                         SLAVE_AD_INFO(new_slave).id = 1;
1801                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1802                          * can be called only after the mac address of the bond is set
1803                          */
1804                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1805                 } else {
1806                         SLAVE_AD_INFO(new_slave).id =
1807                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1808                 }
1809
1810                 bond_3ad_bind_slave(new_slave);
1811                 break;
1812         case BOND_MODE_TLB:
1813         case BOND_MODE_ALB:
1814                 bond_set_active_slave(new_slave);
1815                 bond_set_slave_inactive_flags(new_slave);
1816                 bond_select_active_slave(bond);
1817                 break;
1818         default:
1819                 pr_debug("This slave is always active in trunk mode\n");
1820
1821                 /* always active in trunk mode */
1822                 bond_set_active_slave(new_slave);
1823
1824                 /* In trunking mode there is little meaning to curr_active_slave
1825                  * anyway (it holds no special properties of the bond device),
1826                  * so we can change it without calling change_active_interface()
1827                  */
1828                 if (!bond->curr_active_slave)
1829                         bond->curr_active_slave = new_slave;
1830
1831                 break;
1832         } /* switch(bond_mode) */
1833
1834         write_unlock_bh(&bond->curr_slave_lock);
1835
1836         bond_set_carrier(bond);
1837
1838 #ifdef CONFIG_NET_POLL_CONTROLLER
1839         slave_dev->npinfo = bond_netpoll_info(bond);
1840         if (slave_dev->npinfo) {
1841                 if (slave_enable_netpoll(new_slave)) {
1842                         read_unlock(&bond->lock);
1843                         pr_info("Error, %s: master_dev is using netpoll, "
1844                                  "but new slave device does not support netpoll.\n",
1845                                  bond_dev->name);
1846                         res = -EBUSY;
1847                         goto err_detach;
1848                 }
1849         }
1850 #endif
1851
1852         read_unlock(&bond->lock);
1853
1854         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1855         if (res)
1856                 goto err_detach;
1857
1858         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1859                                          new_slave);
1860         if (res) {
1861                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1862                 goto err_dest_symlinks;
1863         }
1864
1865         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1866                 bond_dev->name, slave_dev->name,
1867                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1868                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1869
1870         /* enslave is successful */
1871         return 0;
1872
1873 /* Undo stages on error */
1874 err_dest_symlinks:
1875         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1876
1877 err_detach:
1878         write_lock_bh(&bond->lock);
1879         bond_detach_slave(bond, new_slave);
1880         write_unlock_bh(&bond->lock);
1881
1882 err_close:
1883         dev_close(slave_dev);
1884
1885 err_unset_master:
1886         netdev_set_bond_master(slave_dev, NULL);
1887
1888 err_restore_mac:
1889         if (!bond->params.fail_over_mac) {
1890                 /* XXX TODO - fom follow mode needs to change master's
1891                  * MAC if this slave's MAC is in use by the bond, or at
1892                  * least print a warning.
1893                  */
1894                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1895                 addr.sa_family = slave_dev->type;
1896                 dev_set_mac_address(slave_dev, &addr);
1897         }
1898
1899 err_restore_mtu:
1900         dev_set_mtu(slave_dev, new_slave->original_mtu);
1901
1902 err_free:
1903         kfree(new_slave);
1904
1905 err_undo_flags:
1906         bond_compute_features(bond);
1907
1908         return res;
1909 }
1910
1911 /*
1912  * Try to release the slave device <slave> from the bond device <master>
1913  * It is legal to access curr_active_slave without a lock because all the function
1914  * is write-locked.
1915  *
1916  * The rules for slave state should be:
1917  *   for Active/Backup:
1918  *     Active stays on all backups go down
1919  *   for Bonded connections:
1920  *     The first up interface should be left on and all others downed.
1921  */
1922 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1923 {
1924         struct bonding *bond = netdev_priv(bond_dev);
1925         struct slave *slave, *oldcurrent;
1926         struct sockaddr addr;
1927         netdev_features_t old_features = bond_dev->features;
1928
1929         /* slave is not a slave or master is not master of this slave */
1930         if (!(slave_dev->flags & IFF_SLAVE) ||
1931             (slave_dev->master != bond_dev)) {
1932                 pr_err("%s: Error: cannot release %s.\n",
1933                        bond_dev->name, slave_dev->name);
1934                 return -EINVAL;
1935         }
1936
1937         block_netpoll_tx();
1938         netdev_bonding_change(bond_dev, NETDEV_RELEASE);
1939         write_lock_bh(&bond->lock);
1940
1941         slave = bond_get_slave_by_dev(bond, slave_dev);
1942         if (!slave) {
1943                 /* not a slave of this bond */
1944                 pr_info("%s: %s not enslaved\n",
1945                         bond_dev->name, slave_dev->name);
1946                 write_unlock_bh(&bond->lock);
1947                 unblock_netpoll_tx();
1948                 return -EINVAL;
1949         }
1950
1951         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1952          * for this slave anymore.
1953          */
1954         netdev_rx_handler_unregister(slave_dev);
1955         write_unlock_bh(&bond->lock);
1956         synchronize_net();
1957         write_lock_bh(&bond->lock);
1958
1959         if (!bond->params.fail_over_mac) {
1960                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1961                     bond->slave_cnt > 1)
1962                         pr_warning("%s: Warning: the permanent HWaddr of %s - %pM - is still in use by %s. Set the HWaddr of %s to a different address to avoid conflicts.\n",
1963                                    bond_dev->name, slave_dev->name,
1964                                    slave->perm_hwaddr,
1965                                    bond_dev->name, slave_dev->name);
1966         }
1967
1968         /* Inform AD package of unbinding of slave. */
1969         if (bond->params.mode == BOND_MODE_8023AD) {
1970                 /* must be called before the slave is
1971                  * detached from the list
1972                  */
1973                 bond_3ad_unbind_slave(slave);
1974         }
1975
1976         pr_info("%s: releasing %s interface %s\n",
1977                 bond_dev->name,
1978                 bond_is_active_slave(slave) ? "active" : "backup",
1979                 slave_dev->name);
1980
1981         oldcurrent = bond->curr_active_slave;
1982
1983         bond->current_arp_slave = NULL;
1984
1985         /* release the slave from its bond */
1986         bond_detach_slave(bond, slave);
1987
1988         if (bond->primary_slave == slave)
1989                 bond->primary_slave = NULL;
1990
1991         if (oldcurrent == slave)
1992                 bond_change_active_slave(bond, NULL);
1993
1994         if (bond_is_lb(bond)) {
1995                 /* Must be called only after the slave has been
1996                  * detached from the list and the curr_active_slave
1997                  * has been cleared (if our_slave == old_current),
1998                  * but before a new active slave is selected.
1999                  */
2000                 write_unlock_bh(&bond->lock);
2001                 bond_alb_deinit_slave(bond, slave);
2002                 write_lock_bh(&bond->lock);
2003         }
2004
2005         if (oldcurrent == slave) {
2006                 /*
2007                  * Note that we hold RTNL over this sequence, so there
2008                  * is no concern that another slave add/remove event
2009                  * will interfere.
2010                  */
2011                 write_unlock_bh(&bond->lock);
2012                 read_lock(&bond->lock);
2013                 write_lock_bh(&bond->curr_slave_lock);
2014
2015                 bond_select_active_slave(bond);
2016
2017                 write_unlock_bh(&bond->curr_slave_lock);
2018                 read_unlock(&bond->lock);
2019                 write_lock_bh(&bond->lock);
2020         }
2021
2022         if (bond->slave_cnt == 0) {
2023                 bond_set_carrier(bond);
2024
2025                 /* if the last slave was removed, zero the mac address
2026                  * of the master so it will be set by the application
2027                  * to the mac address of the first slave
2028                  */
2029                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2030
2031                 if (bond_vlan_used(bond)) {
2032                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2033                                    bond_dev->name, bond_dev->name);
2034                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2035                                    bond_dev->name);
2036                 }
2037         }
2038
2039         write_unlock_bh(&bond->lock);
2040         unblock_netpoll_tx();
2041
2042         if (bond->slave_cnt == 0)
2043                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2044
2045         bond_compute_features(bond);
2046         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2047             (old_features & NETIF_F_VLAN_CHALLENGED))
2048                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2049                         bond_dev->name, slave_dev->name, bond_dev->name);
2050
2051         /* must do this from outside any spinlocks */
2052         bond_destroy_slave_symlinks(bond_dev, slave_dev);
2053
2054         bond_del_vlans_from_slave(bond, slave_dev);
2055
2056         /* If the mode USES_PRIMARY, then we should only remove its
2057          * promisc and mc settings if it was the curr_active_slave, but that was
2058          * already taken care of above when we detached the slave
2059          */
2060         if (!USES_PRIMARY(bond->params.mode)) {
2061                 /* unset promiscuity level from slave */
2062                 if (bond_dev->flags & IFF_PROMISC)
2063                         dev_set_promiscuity(slave_dev, -1);
2064
2065                 /* unset allmulti level from slave */
2066                 if (bond_dev->flags & IFF_ALLMULTI)
2067                         dev_set_allmulti(slave_dev, -1);
2068
2069                 /* flush master's mc_list from slave */
2070                 netif_addr_lock_bh(bond_dev);
2071                 bond_mc_list_flush(bond_dev, slave_dev);
2072                 netif_addr_unlock_bh(bond_dev);
2073         }
2074
2075         netdev_set_bond_master(slave_dev, NULL);
2076
2077         slave_disable_netpoll(slave);
2078
2079         /* close slave before restoring its mac address */
2080         dev_close(slave_dev);
2081
2082         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2083                 /* restore original ("permanent") mac address */
2084                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2085                 addr.sa_family = slave_dev->type;
2086                 dev_set_mac_address(slave_dev, &addr);
2087         }
2088
2089         dev_set_mtu(slave_dev, slave->original_mtu);
2090
2091         slave_dev->priv_flags &= ~IFF_BONDING;
2092
2093         kfree(slave);
2094
2095         return 0;  /* deletion OK */
2096 }
2097
2098 /*
2099 * First release a slave and then destroy the bond if no more slaves are left.
2100 * Must be under rtnl_lock when this function is called.
2101 */
2102 static int  bond_release_and_destroy(struct net_device *bond_dev,
2103                                      struct net_device *slave_dev)
2104 {
2105         struct bonding *bond = netdev_priv(bond_dev);
2106         int ret;
2107
2108         ret = bond_release(bond_dev, slave_dev);
2109         if ((ret == 0) && (bond->slave_cnt == 0)) {
2110                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2111                 pr_info("%s: destroying bond %s.\n",
2112                         bond_dev->name, bond_dev->name);
2113                 unregister_netdevice(bond_dev);
2114         }
2115         return ret;
2116 }
2117
2118 /*
2119  * This function releases all slaves.
2120  */
2121 static int bond_release_all(struct net_device *bond_dev)
2122 {
2123         struct bonding *bond = netdev_priv(bond_dev);
2124         struct slave *slave;
2125         struct net_device *slave_dev;
2126         struct sockaddr addr;
2127
2128         write_lock_bh(&bond->lock);
2129
2130         netif_carrier_off(bond_dev);
2131
2132         if (bond->slave_cnt == 0)
2133                 goto out;
2134
2135         bond->current_arp_slave = NULL;
2136         bond->primary_slave = NULL;
2137         bond_change_active_slave(bond, NULL);
2138
2139         while ((slave = bond->first_slave) != NULL) {
2140                 /* Inform AD package of unbinding of slave
2141                  * before slave is detached from the list.
2142                  */
2143                 if (bond->params.mode == BOND_MODE_8023AD)
2144                         bond_3ad_unbind_slave(slave);
2145
2146                 slave_dev = slave->dev;
2147                 bond_detach_slave(bond, slave);
2148
2149                 /* now that the slave is detached, unlock and perform
2150                  * all the undo steps that should not be called from
2151                  * within a lock.
2152                  */
2153                 write_unlock_bh(&bond->lock);
2154
2155                 /* unregister rx_handler early so bond_handle_frame wouldn't
2156                  * be called for this slave anymore.
2157                  */
2158                 netdev_rx_handler_unregister(slave_dev);
2159                 synchronize_net();
2160
2161                 if (bond_is_lb(bond)) {
2162                         /* must be called only after the slave
2163                          * has been detached from the list
2164                          */
2165                         bond_alb_deinit_slave(bond, slave);
2166                 }
2167
2168                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2169                 bond_del_vlans_from_slave(bond, slave_dev);
2170
2171                 /* If the mode USES_PRIMARY, then we should only remove its
2172                  * promisc and mc settings if it was the curr_active_slave, but that was
2173                  * already taken care of above when we detached the slave
2174                  */
2175                 if (!USES_PRIMARY(bond->params.mode)) {
2176                         /* unset promiscuity level from slave */
2177                         if (bond_dev->flags & IFF_PROMISC)
2178                                 dev_set_promiscuity(slave_dev, -1);
2179
2180                         /* unset allmulti level from slave */
2181                         if (bond_dev->flags & IFF_ALLMULTI)
2182                                 dev_set_allmulti(slave_dev, -1);
2183
2184                         /* flush master's mc_list from slave */
2185                         netif_addr_lock_bh(bond_dev);
2186                         bond_mc_list_flush(bond_dev, slave_dev);
2187                         netif_addr_unlock_bh(bond_dev);
2188                 }
2189
2190                 netdev_set_bond_master(slave_dev, NULL);
2191
2192                 slave_disable_netpoll(slave);
2193
2194                 /* close slave before restoring its mac address */
2195                 dev_close(slave_dev);
2196
2197                 if (!bond->params.fail_over_mac) {
2198                         /* restore original ("permanent") mac address*/
2199                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2200                         addr.sa_family = slave_dev->type;
2201                         dev_set_mac_address(slave_dev, &addr);
2202                 }
2203
2204                 kfree(slave);
2205
2206                 /* re-acquire the lock before getting the next slave */
2207                 write_lock_bh(&bond->lock);
2208         }
2209
2210         /* zero the mac address of the master so it will be
2211          * set by the application to the mac address of the
2212          * first slave
2213          */
2214         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2215
2216         if (bond_vlan_used(bond)) {
2217                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2218                            bond_dev->name, bond_dev->name);
2219                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2220                            bond_dev->name);
2221         }
2222
2223         pr_info("%s: released all slaves\n", bond_dev->name);
2224
2225 out:
2226         write_unlock_bh(&bond->lock);
2227
2228         bond_compute_features(bond);
2229
2230         return 0;
2231 }
2232
2233 /*
2234  * This function changes the active slave to slave <slave_dev>.
2235  * It returns -EINVAL in the following cases.
2236  *  - <slave_dev> is not found in the list.
2237  *  - There is not active slave now.
2238  *  - <slave_dev> is already active.
2239  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2240  *  - <slave_dev> is not running.
2241  * In these cases, this function does nothing.
2242  * In the other cases, current_slave pointer is changed and 0 is returned.
2243  */
2244 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2245 {
2246         struct bonding *bond = netdev_priv(bond_dev);
2247         struct slave *old_active = NULL;
2248         struct slave *new_active = NULL;
2249         int res = 0;
2250
2251         if (!USES_PRIMARY(bond->params.mode))
2252                 return -EINVAL;
2253
2254         /* Verify that master_dev is indeed the master of slave_dev */
2255         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2256                 return -EINVAL;
2257
2258         read_lock(&bond->lock);
2259
2260         read_lock(&bond->curr_slave_lock);
2261         old_active = bond->curr_active_slave;
2262         read_unlock(&bond->curr_slave_lock);
2263
2264         new_active = bond_get_slave_by_dev(bond, slave_dev);
2265
2266         /*
2267          * Changing to the current active: do nothing; return success.
2268          */
2269         if (new_active && (new_active == old_active)) {
2270                 read_unlock(&bond->lock);
2271                 return 0;
2272         }
2273
2274         if ((new_active) &&
2275             (old_active) &&
2276             (new_active->link == BOND_LINK_UP) &&
2277             IS_UP(new_active->dev)) {
2278                 block_netpoll_tx();
2279                 write_lock_bh(&bond->curr_slave_lock);
2280                 bond_change_active_slave(bond, new_active);
2281                 write_unlock_bh(&bond->curr_slave_lock);
2282                 unblock_netpoll_tx();
2283         } else
2284                 res = -EINVAL;
2285
2286         read_unlock(&bond->lock);
2287
2288         return res;
2289 }
2290
2291 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2292 {
2293         struct bonding *bond = netdev_priv(bond_dev);
2294
2295         info->bond_mode = bond->params.mode;
2296         info->miimon = bond->params.miimon;
2297
2298         read_lock(&bond->lock);
2299         info->num_slaves = bond->slave_cnt;
2300         read_unlock(&bond->lock);
2301
2302         return 0;
2303 }
2304
2305 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2306 {
2307         struct bonding *bond = netdev_priv(bond_dev);
2308         struct slave *slave;
2309         int i, res = -ENODEV;
2310
2311         read_lock(&bond->lock);
2312
2313         bond_for_each_slave(bond, slave, i) {
2314                 if (i == (int)info->slave_id) {
2315                         res = 0;
2316                         strcpy(info->slave_name, slave->dev->name);
2317                         info->link = slave->link;
2318                         info->state = bond_slave_state(slave);
2319                         info->link_failure_count = slave->link_failure_count;
2320                         break;
2321                 }
2322         }
2323
2324         read_unlock(&bond->lock);
2325
2326         return res;
2327 }
2328
2329 /*-------------------------------- Monitoring -------------------------------*/
2330
2331
2332 static int bond_miimon_inspect(struct bonding *bond)
2333 {
2334         struct slave *slave;
2335         int i, link_state, commit = 0;
2336         bool ignore_updelay;
2337
2338         ignore_updelay = !bond->curr_active_slave ? true : false;
2339
2340         bond_for_each_slave(bond, slave, i) {
2341                 slave->new_link = BOND_LINK_NOCHANGE;
2342
2343                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2344
2345                 switch (slave->link) {
2346                 case BOND_LINK_UP:
2347                         if (link_state)
2348                                 continue;
2349
2350                         slave->link = BOND_LINK_FAIL;
2351                         slave->delay = bond->params.downdelay;
2352                         if (slave->delay) {
2353                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2354                                         bond->dev->name,
2355                                         (bond->params.mode ==
2356                                          BOND_MODE_ACTIVEBACKUP) ?
2357                                         (bond_is_active_slave(slave) ?
2358                                          "active " : "backup ") : "",
2359                                         slave->dev->name,
2360                                         bond->params.downdelay * bond->params.miimon);
2361                         }
2362                         /*FALLTHRU*/
2363                 case BOND_LINK_FAIL:
2364                         if (link_state) {
2365                                 /*
2366                                  * recovered before downdelay expired
2367                                  */
2368                                 slave->link = BOND_LINK_UP;
2369                                 slave->jiffies = jiffies;
2370                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2371                                         bond->dev->name,
2372                                         (bond->params.downdelay - slave->delay) *
2373                                         bond->params.miimon,
2374                                         slave->dev->name);
2375                                 continue;
2376                         }
2377
2378                         if (slave->delay <= 0) {
2379                                 slave->new_link = BOND_LINK_DOWN;
2380                                 commit++;
2381                                 continue;
2382                         }
2383
2384                         slave->delay--;
2385                         break;
2386
2387                 case BOND_LINK_DOWN:
2388                         if (!link_state)
2389                                 continue;
2390
2391                         slave->link = BOND_LINK_BACK;
2392                         slave->delay = bond->params.updelay;
2393
2394                         if (slave->delay) {
2395                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2396                                         bond->dev->name, slave->dev->name,
2397                                         ignore_updelay ? 0 :
2398                                         bond->params.updelay *
2399                                         bond->params.miimon);
2400                         }
2401                         /*FALLTHRU*/
2402                 case BOND_LINK_BACK:
2403                         if (!link_state) {
2404                                 slave->link = BOND_LINK_DOWN;
2405                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2406                                         bond->dev->name,
2407                                         (bond->params.updelay - slave->delay) *
2408                                         bond->params.miimon,
2409                                         slave->dev->name);
2410
2411                                 continue;
2412                         }
2413
2414                         if (ignore_updelay)
2415                                 slave->delay = 0;
2416
2417                         if (slave->delay <= 0) {
2418                                 slave->new_link = BOND_LINK_UP;
2419                                 commit++;
2420                                 ignore_updelay = false;
2421                                 continue;
2422                         }
2423
2424                         slave->delay--;
2425                         break;
2426                 }
2427         }
2428
2429         return commit;
2430 }
2431
2432 static void bond_miimon_commit(struct bonding *bond)
2433 {
2434         struct slave *slave;
2435         int i;
2436
2437         bond_for_each_slave(bond, slave, i) {
2438                 switch (slave->new_link) {
2439                 case BOND_LINK_NOCHANGE:
2440                         continue;
2441
2442                 case BOND_LINK_UP:
2443                         slave->link = BOND_LINK_UP;
2444                         slave->jiffies = jiffies;
2445
2446                         if (bond->params.mode == BOND_MODE_8023AD) {
2447                                 /* prevent it from being the active one */
2448                                 bond_set_backup_slave(slave);
2449                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2450                                 /* make it immediately active */
2451                                 bond_set_active_slave(slave);
2452                         } else if (slave != bond->primary_slave) {
2453                                 /* prevent it from being the active one */
2454                                 bond_set_backup_slave(slave);
2455                         }
2456
2457                         bond_update_speed_duplex(slave);
2458
2459                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2460                                 bond->dev->name, slave->dev->name,
2461                                 slave->speed, slave->duplex ? "full" : "half");
2462
2463                         /* notify ad that the link status has changed */
2464                         if (bond->params.mode == BOND_MODE_8023AD)
2465                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2466
2467                         if (bond_is_lb(bond))
2468                                 bond_alb_handle_link_change(bond, slave,
2469                                                             BOND_LINK_UP);
2470
2471                         if (!bond->curr_active_slave ||
2472                             (slave == bond->primary_slave))
2473                                 goto do_failover;
2474
2475                         continue;
2476
2477                 case BOND_LINK_DOWN:
2478                         if (slave->link_failure_count < UINT_MAX)
2479                                 slave->link_failure_count++;
2480
2481                         slave->link = BOND_LINK_DOWN;
2482
2483                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2484                             bond->params.mode == BOND_MODE_8023AD)
2485                                 bond_set_slave_inactive_flags(slave);
2486
2487                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2488                                 bond->dev->name, slave->dev->name);
2489
2490                         if (bond->params.mode == BOND_MODE_8023AD)
2491                                 bond_3ad_handle_link_change(slave,
2492                                                             BOND_LINK_DOWN);
2493
2494                         if (bond_is_lb(bond))
2495                                 bond_alb_handle_link_change(bond, slave,
2496                                                             BOND_LINK_DOWN);
2497
2498                         if (slave == bond->curr_active_slave)
2499                                 goto do_failover;
2500
2501                         continue;
2502
2503                 default:
2504                         pr_err("%s: invalid new link %d on slave %s\n",
2505                                bond->dev->name, slave->new_link,
2506                                slave->dev->name);
2507                         slave->new_link = BOND_LINK_NOCHANGE;
2508
2509                         continue;
2510                 }
2511
2512 do_failover:
2513                 ASSERT_RTNL();
2514                 block_netpoll_tx();
2515                 write_lock_bh(&bond->curr_slave_lock);
2516                 bond_select_active_slave(bond);
2517                 write_unlock_bh(&bond->curr_slave_lock);
2518                 unblock_netpoll_tx();
2519         }
2520
2521         bond_set_carrier(bond);
2522 }
2523
2524 /*
2525  * bond_mii_monitor
2526  *
2527  * Really a wrapper that splits the mii monitor into two phases: an
2528  * inspection, then (if inspection indicates something needs to be done)
2529  * an acquisition of appropriate locks followed by a commit phase to
2530  * implement whatever link state changes are indicated.
2531  */
2532 void bond_mii_monitor(struct work_struct *work)
2533 {
2534         struct bonding *bond = container_of(work, struct bonding,
2535                                             mii_work.work);
2536         bool should_notify_peers = false;
2537         unsigned long delay;
2538
2539         read_lock(&bond->lock);
2540
2541         delay = msecs_to_jiffies(bond->params.miimon);
2542
2543         if (bond->slave_cnt == 0)
2544                 goto re_arm;
2545
2546         should_notify_peers = bond_should_notify_peers(bond);
2547
2548         if (bond_miimon_inspect(bond)) {
2549                 read_unlock(&bond->lock);
2550
2551                 /* Race avoidance with bond_close cancel of workqueue */
2552                 if (!rtnl_trylock()) {
2553                         read_lock(&bond->lock);
2554                         delay = 1;
2555                         should_notify_peers = false;
2556                         goto re_arm;
2557                 }
2558
2559                 read_lock(&bond->lock);
2560
2561                 bond_miimon_commit(bond);
2562
2563                 read_unlock(&bond->lock);
2564                 rtnl_unlock();  /* might sleep, hold no other locks */
2565                 read_lock(&bond->lock);
2566         }
2567
2568 re_arm:
2569         if (bond->params.miimon)
2570                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2571
2572         read_unlock(&bond->lock);
2573
2574         if (should_notify_peers) {
2575                 if (!rtnl_trylock()) {
2576                         read_lock(&bond->lock);
2577                         bond->send_peer_notif++;
2578                         read_unlock(&bond->lock);
2579                         return;
2580                 }
2581                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
2582                 rtnl_unlock();
2583         }
2584 }
2585
2586 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2587 {
2588         struct vlan_entry *vlan;
2589         struct net_device *vlan_dev;
2590
2591         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2592                 return 1;
2593
2594         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2595                 rcu_read_lock();
2596                 vlan_dev = __vlan_find_dev_deep(bond->dev, vlan->vlan_id);
2597                 rcu_read_unlock();
2598                 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
2599                         return 1;
2600         }
2601
2602         return 0;
2603 }
2604
2605 /*
2606  * We go to the (large) trouble of VLAN tagging ARP frames because
2607  * switches in VLAN mode (especially if ports are configured as
2608  * "native" to a VLAN) might not pass non-tagged frames.
2609  */
2610 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2611 {
2612         struct sk_buff *skb;
2613
2614         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2615                  slave_dev->name, dest_ip, src_ip, vlan_id);
2616
2617         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2618                          NULL, slave_dev->dev_addr, NULL);
2619
2620         if (!skb) {
2621                 pr_err("ARP packet allocation failed\n");
2622                 return;
2623         }
2624         if (vlan_id) {
2625                 skb = vlan_put_tag(skb, vlan_id);
2626                 if (!skb) {
2627                         pr_err("failed to insert VLAN tag\n");
2628                         return;
2629                 }
2630         }
2631         arp_xmit(skb);
2632 }
2633
2634
2635 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2636 {
2637         int i, vlan_id;
2638         __be32 *targets = bond->params.arp_targets;
2639         struct vlan_entry *vlan;
2640         struct net_device *vlan_dev = NULL;
2641         struct rtable *rt;
2642
2643         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2644                 __be32 addr;
2645                 if (!targets[i])
2646                         break;
2647                 pr_debug("basa: target %x\n", targets[i]);
2648                 if (!bond_vlan_used(bond)) {
2649                         pr_debug("basa: empty vlan: arp_send\n");
2650                         addr = bond_confirm_addr(bond->dev, targets[i], 0);
2651                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2652                                       addr, 0);
2653                         continue;
2654                 }
2655
2656                 /*
2657                  * If VLANs are configured, we do a route lookup to
2658                  * determine which VLAN interface would be used, so we
2659                  * can tag the ARP with the proper VLAN tag.
2660                  */
2661                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2662                                      RTO_ONLINK, 0);
2663                 if (IS_ERR(rt)) {
2664                         if (net_ratelimit()) {
2665                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2666                                            bond->dev->name, &targets[i]);
2667                         }
2668                         continue;
2669                 }
2670
2671                 /*
2672                  * This target is not on a VLAN
2673                  */
2674                 if (rt->dst.dev == bond->dev) {
2675                         ip_rt_put(rt);
2676                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2677                         addr = bond_confirm_addr(bond->dev, targets[i], 0);
2678                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2679                                       addr, 0);
2680                         continue;
2681                 }
2682
2683                 vlan_id = 0;
2684                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2685                         rcu_read_lock();
2686                         vlan_dev = __vlan_find_dev_deep(bond->dev,
2687                                                         vlan->vlan_id);
2688                         rcu_read_unlock();
2689                         if (vlan_dev == rt->dst.dev) {
2690                                 vlan_id = vlan->vlan_id;
2691                                 pr_debug("basa: vlan match on %s %d\n",
2692                                        vlan_dev->name, vlan_id);
2693                                 break;
2694                         }
2695                 }
2696
2697                 if (vlan_id && vlan_dev) {
2698                         ip_rt_put(rt);
2699                         addr = bond_confirm_addr(vlan_dev, targets[i], 0);
2700                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2701                                       addr, vlan_id);
2702                         continue;
2703                 }
2704
2705                 if (net_ratelimit()) {
2706                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2707                                    bond->dev->name, &targets[i],
2708                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2709                 }
2710                 ip_rt_put(rt);
2711         }
2712 }
2713
2714 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2715 {
2716         int i;
2717         __be32 *targets = bond->params.arp_targets;
2718
2719         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2720                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2721                          &sip, &tip, i, &targets[i],
2722                          bond_has_this_ip(bond, tip));
2723                 if (sip == targets[i]) {
2724                         if (bond_has_this_ip(bond, tip))
2725                                 slave->last_arp_rx = jiffies;
2726                         return;
2727                 }
2728         }
2729 }
2730
2731 static int bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,
2732                          struct slave *slave)
2733 {
2734         struct arphdr *arp;
2735         unsigned char *arp_ptr;
2736         __be32 sip, tip;
2737
2738         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2739                 return RX_HANDLER_ANOTHER;
2740
2741         read_lock(&bond->lock);
2742
2743         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2744                  bond->dev->name, skb->dev->name);
2745
2746         if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
2747                 goto out_unlock;
2748
2749         arp = arp_hdr(skb);
2750         if (arp->ar_hln != bond->dev->addr_len ||
2751             skb->pkt_type == PACKET_OTHERHOST ||
2752             skb->pkt_type == PACKET_LOOPBACK ||
2753             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2754             arp->ar_pro != htons(ETH_P_IP) ||
2755             arp->ar_pln != 4)
2756                 goto out_unlock;
2757
2758         arp_ptr = (unsigned char *)(arp + 1);
2759         arp_ptr += bond->dev->addr_len;
2760         memcpy(&sip, arp_ptr, 4);
2761         arp_ptr += 4 + bond->dev->addr_len;
2762         memcpy(&tip, arp_ptr, 4);
2763
2764         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2765                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2766                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2767                  &sip, &tip);
2768
2769         /*
2770          * Backup slaves won't see the ARP reply, but do come through
2771          * here for each ARP probe (so we swap the sip/tip to validate
2772          * the probe).  In a "redundant switch, common router" type of
2773          * configuration, the ARP probe will (hopefully) travel from
2774          * the active, through one switch, the router, then the other
2775          * switch before reaching the backup.
2776          */
2777         if (bond_is_active_slave(slave))
2778                 bond_validate_arp(bond, slave, sip, tip);
2779         else
2780                 bond_validate_arp(bond, slave, tip, sip);
2781
2782 out_unlock:
2783         read_unlock(&bond->lock);
2784         return RX_HANDLER_ANOTHER;
2785 }
2786
2787 /*
2788  * this function is called regularly to monitor each slave's link
2789  * ensuring that traffic is being sent and received when arp monitoring
2790  * is used in load-balancing mode. if the adapter has been dormant, then an
2791  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2792  * arp monitoring in active backup mode.
2793  */
2794 void bond_loadbalance_arp_mon(struct work_struct *work)
2795 {
2796         struct bonding *bond = container_of(work, struct bonding,
2797                                             arp_work.work);
2798         struct slave *slave, *oldcurrent;
2799         int do_failover = 0;
2800         int delta_in_ticks;
2801         int i;
2802
2803         read_lock(&bond->lock);
2804
2805         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2806
2807         if (bond->slave_cnt == 0)
2808                 goto re_arm;
2809
2810         read_lock(&bond->curr_slave_lock);
2811         oldcurrent = bond->curr_active_slave;
2812         read_unlock(&bond->curr_slave_lock);
2813
2814         /* see if any of the previous devices are up now (i.e. they have
2815          * xmt and rcv traffic). the curr_active_slave does not come into
2816          * the picture unless it is null. also, slave->jiffies is not needed
2817          * here because we send an arp on each slave and give a slave as
2818          * long as it needs to get the tx/rx within the delta.
2819          * TODO: what about up/down delay in arp mode? it wasn't here before
2820          *       so it can wait
2821          */
2822         bond_for_each_slave(bond, slave, i) {
2823                 unsigned long trans_start = dev_trans_start(slave->dev);
2824
2825                 if (slave->link != BOND_LINK_UP) {
2826                         if (time_in_range(jiffies,
2827                                 trans_start - delta_in_ticks,
2828                                 trans_start + delta_in_ticks) &&
2829                             time_in_range(jiffies,
2830                                 slave->dev->last_rx - delta_in_ticks,
2831                                 slave->dev->last_rx + delta_in_ticks)) {
2832
2833                                 slave->link  = BOND_LINK_UP;
2834                                 bond_set_active_slave(slave);
2835
2836                                 /* primary_slave has no meaning in round-robin
2837                                  * mode. the window of a slave being up and
2838                                  * curr_active_slave being null after enslaving
2839                                  * is closed.
2840                                  */
2841                                 if (!oldcurrent) {
2842                                         pr_info("%s: link status definitely up for interface %s, ",
2843                                                 bond->dev->name,
2844                                                 slave->dev->name);
2845                                         do_failover = 1;
2846                                 } else {
2847                                         pr_info("%s: interface %s is now up\n",
2848                                                 bond->dev->name,
2849                                                 slave->dev->name);
2850                                 }
2851                         }
2852                 } else {
2853                         /* slave->link == BOND_LINK_UP */
2854
2855                         /* not all switches will respond to an arp request
2856                          * when the source ip is 0, so don't take the link down
2857                          * if we don't know our ip yet
2858                          */
2859                         if (!time_in_range(jiffies,
2860                                 trans_start - delta_in_ticks,
2861                                 trans_start + 2 * delta_in_ticks) ||
2862                             !time_in_range(jiffies,
2863                                 slave->dev->last_rx - delta_in_ticks,
2864                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2865
2866                                 slave->link  = BOND_LINK_DOWN;
2867                                 bond_set_backup_slave(slave);
2868
2869                                 if (slave->link_failure_count < UINT_MAX)
2870                                         slave->link_failure_count++;
2871
2872                                 pr_info("%s: interface %s is now down.\n",
2873                                         bond->dev->name,
2874                                         slave->dev->name);
2875
2876                                 if (slave == oldcurrent)
2877                                         do_failover = 1;
2878                         }
2879                 }
2880
2881                 /* note: if switch is in round-robin mode, all links
2882                  * must tx arp to ensure all links rx an arp - otherwise
2883                  * links may oscillate or not come up at all; if switch is
2884                  * in something like xor mode, there is nothing we can
2885                  * do - all replies will be rx'ed on same link causing slaves
2886                  * to be unstable during low/no traffic periods
2887                  */
2888                 if (IS_UP(slave->dev))
2889                         bond_arp_send_all(bond, slave);
2890         }
2891
2892         if (do_failover) {
2893                 block_netpoll_tx();
2894                 write_lock_bh(&bond->curr_slave_lock);
2895
2896                 bond_select_active_slave(bond);
2897
2898                 write_unlock_bh(&bond->curr_slave_lock);
2899                 unblock_netpoll_tx();
2900         }
2901
2902 re_arm:
2903         if (bond->params.arp_interval)
2904                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2905
2906         read_unlock(&bond->lock);
2907 }
2908
2909 /*
2910  * Called to inspect slaves for active-backup mode ARP monitor link state
2911  * changes.  Sets new_link in slaves to specify what action should take
2912  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2913  * to link states must be committed.
2914  *
2915  * Called with bond->lock held for read.
2916  */
2917 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2918 {
2919         struct slave *slave;
2920         int i, commit = 0;
2921         unsigned long trans_start;
2922
2923         bond_for_each_slave(bond, slave, i) {
2924                 slave->new_link = BOND_LINK_NOCHANGE;
2925
2926                 if (slave->link != BOND_LINK_UP) {
2927                         if (time_in_range(jiffies,
2928                                 slave_last_rx(bond, slave) - delta_in_ticks,
2929                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2930
2931                                 slave->new_link = BOND_LINK_UP;
2932                                 commit++;
2933                         }
2934
2935                         continue;
2936                 }
2937
2938                 /*
2939                  * Give slaves 2*delta after being enslaved or made
2940                  * active.  This avoids bouncing, as the last receive
2941                  * times need a full ARP monitor cycle to be updated.
2942                  */
2943                 if (time_in_range(jiffies,
2944                                   slave->jiffies - delta_in_ticks,
2945                                   slave->jiffies + 2 * delta_in_ticks))
2946                         continue;
2947
2948                 /*
2949                  * Backup slave is down if:
2950                  * - No current_arp_slave AND
2951                  * - more than 3*delta since last receive AND
2952                  * - the bond has an IP address
2953                  *
2954                  * Note: a non-null current_arp_slave indicates
2955                  * the curr_active_slave went down and we are
2956                  * searching for a new one; under this condition
2957                  * we only take the curr_active_slave down - this
2958                  * gives each slave a chance to tx/rx traffic
2959                  * before being taken out
2960                  */
2961                 if (!bond_is_active_slave(slave) &&
2962                     !bond->current_arp_slave &&
2963                     !time_in_range(jiffies,
2964                         slave_last_rx(bond, slave) - delta_in_ticks,
2965                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2966
2967                         slave->new_link = BOND_LINK_DOWN;
2968                         commit++;
2969                 }
2970
2971                 /*
2972                  * Active slave is down if:
2973                  * - more than 2*delta since transmitting OR
2974                  * - (more than 2*delta since receive AND
2975                  *    the bond has an IP address)
2976                  */
2977                 trans_start = dev_trans_start(slave->dev);
2978                 if (bond_is_active_slave(slave) &&
2979                     (!time_in_range(jiffies,
2980                         trans_start - delta_in_ticks,
2981                         trans_start + 2 * delta_in_ticks) ||
2982                      !time_in_range(jiffies,
2983                         slave_last_rx(bond, slave) - delta_in_ticks,
2984                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2985
2986                         slave->new_link = BOND_LINK_DOWN;
2987                         commit++;
2988                 }
2989         }
2990
2991         return commit;
2992 }
2993
2994 /*
2995  * Called to commit link state changes noted by inspection step of
2996  * active-backup mode ARP monitor.
2997  *
2998  * Called with RTNL and bond->lock for read.
2999  */
3000 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3001 {
3002         struct slave *slave;
3003         int i;
3004         unsigned long trans_start;
3005
3006         bond_for_each_slave(bond, slave, i) {
3007                 switch (slave->new_link) {
3008                 case BOND_LINK_NOCHANGE:
3009                         continue;
3010
3011                 case BOND_LINK_UP:
3012                         trans_start = dev_trans_start(slave->dev);
3013                         if ((!bond->curr_active_slave &&
3014                              time_in_range(jiffies,
3015                                            trans_start - delta_in_ticks,
3016                                            trans_start + delta_in_ticks)) ||
3017                             bond->curr_active_slave != slave) {
3018                                 slave->link = BOND_LINK_UP;
3019                                 if (bond->current_arp_slave) {
3020                                         bond_set_slave_inactive_flags(
3021                                                 bond->current_arp_slave);
3022                                         bond->current_arp_slave = NULL;
3023                                 }
3024
3025                                 pr_info("%s: link status definitely up for interface %s.\n",
3026                                         bond->dev->name, slave->dev->name);
3027
3028                                 if (!bond->curr_active_slave ||
3029                                     (slave == bond->primary_slave))
3030                                         goto do_failover;
3031
3032                         }
3033
3034                         continue;
3035
3036                 case BOND_LINK_DOWN:
3037                         if (slave->link_failure_count < UINT_MAX)
3038                                 slave->link_failure_count++;
3039
3040                         slave->link = BOND_LINK_DOWN;
3041                         bond_set_slave_inactive_flags(slave);
3042
3043                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3044                                 bond->dev->name, slave->dev->name);
3045
3046                         if (slave == bond->curr_active_slave) {
3047                                 bond->current_arp_slave = NULL;
3048                                 goto do_failover;
3049                         }
3050
3051                         continue;
3052
3053                 default:
3054                         pr_err("%s: impossible: new_link %d on slave %s\n",
3055                                bond->dev->name, slave->new_link,
3056                                slave->dev->name);
3057                         continue;
3058                 }
3059
3060 do_failover:
3061                 ASSERT_RTNL();
3062                 block_netpoll_tx();
3063                 write_lock_bh(&bond->curr_slave_lock);
3064                 bond_select_active_slave(bond);
3065                 write_unlock_bh(&bond->curr_slave_lock);
3066                 unblock_netpoll_tx();
3067         }
3068
3069         bond_set_carrier(bond);
3070 }
3071
3072 /*
3073  * Send ARP probes for active-backup mode ARP monitor.
3074  *
3075  * Called with bond->lock held for read.
3076  */
3077 static void bond_ab_arp_probe(struct bonding *bond)
3078 {
3079         struct slave *slave;
3080         int i;
3081
3082         read_lock(&bond->curr_slave_lock);
3083
3084         if (bond->current_arp_slave && bond->curr_active_slave)
3085                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3086                         bond->current_arp_slave->dev->name,
3087                         bond->curr_active_slave->dev->name);
3088
3089         if (bond->curr_active_slave) {
3090                 bond_arp_send_all(bond, bond->curr_active_slave);
3091                 read_unlock(&bond->curr_slave_lock);
3092                 return;
3093         }
3094
3095         read_unlock(&bond->curr_slave_lock);
3096
3097         /* if we don't have a curr_active_slave, search for the next available
3098          * backup slave from the current_arp_slave and make it the candidate
3099          * for becoming the curr_active_slave
3100          */
3101
3102         if (!bond->current_arp_slave) {
3103                 bond->current_arp_slave = bond->first_slave;
3104                 if (!bond->current_arp_slave)
3105                         return;
3106         }
3107
3108         bond_set_slave_inactive_flags(bond->current_arp_slave);
3109
3110         /* search for next candidate */
3111         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3112                 if (IS_UP(slave->dev)) {
3113                         slave->link = BOND_LINK_BACK;
3114                         bond_set_slave_active_flags(slave);
3115                         bond_arp_send_all(bond, slave);
3116                         slave->jiffies = jiffies;
3117                         bond->current_arp_slave = slave;
3118                         break;
3119                 }
3120
3121                 /* if the link state is up at this point, we
3122                  * mark it down - this can happen if we have
3123                  * simultaneous link failures and
3124                  * reselect_active_interface doesn't make this
3125                  * one the current slave so it is still marked
3126                  * up when it is actually down
3127                  */
3128                 if (slave->link == BOND_LINK_UP) {
3129                         slave->link = BOND_LINK_DOWN;
3130                         if (slave->link_failure_count < UINT_MAX)
3131                                 slave->link_failure_count++;
3132
3133                         bond_set_slave_inactive_flags(slave);
3134
3135                         pr_info("%s: backup interface %s is now down.\n",
3136                                 bond->dev->name, slave->dev->name);
3137                 }
3138         }
3139 }
3140
3141 void bond_activebackup_arp_mon(struct work_struct *work)
3142 {
3143         struct bonding *bond = container_of(work, struct bonding,
3144                                             arp_work.work);
3145         bool should_notify_peers = false;
3146         int delta_in_ticks;
3147
3148         read_lock(&bond->lock);
3149
3150         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3151
3152         if (bond->slave_cnt == 0)
3153                 goto re_arm;
3154
3155         should_notify_peers = bond_should_notify_peers(bond);
3156
3157         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3158                 read_unlock(&bond->lock);
3159
3160                 /* Race avoidance with bond_close flush of workqueue */
3161                 if (!rtnl_trylock()) {
3162                         read_lock(&bond->lock);
3163                         delta_in_ticks = 1;
3164                         should_notify_peers = false;
3165                         goto re_arm;
3166                 }
3167
3168                 read_lock(&bond->lock);
3169
3170                 bond_ab_arp_commit(bond, delta_in_ticks);
3171
3172                 read_unlock(&bond->lock);
3173                 rtnl_unlock();
3174                 read_lock(&bond->lock);
3175         }
3176
3177         bond_ab_arp_probe(bond);
3178
3179 re_arm:
3180         if (bond->params.arp_interval)
3181                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3182
3183         read_unlock(&bond->lock);
3184
3185         if (should_notify_peers) {
3186                 if (!rtnl_trylock()) {
3187                         read_lock(&bond->lock);
3188                         bond->send_peer_notif++;
3189                         read_unlock(&bond->lock);
3190                         return;
3191                 }
3192                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
3193                 rtnl_unlock();
3194         }
3195 }
3196
3197 /*-------------------------- netdev event handling --------------------------*/
3198
3199 /*
3200  * Change device name
3201  */
3202 static int bond_event_changename(struct bonding *bond)
3203 {
3204         bond_remove_proc_entry(bond);
3205         bond_create_proc_entry(bond);
3206
3207         bond_debug_reregister(bond);
3208
3209         return NOTIFY_DONE;
3210 }
3211
3212 static int bond_master_netdev_event(unsigned long event,
3213                                     struct net_device *bond_dev)
3214 {
3215         struct bonding *event_bond = netdev_priv(bond_dev);
3216
3217         switch (event) {
3218         case NETDEV_CHANGENAME:
3219                 return bond_event_changename(event_bond);
3220         default:
3221                 break;
3222         }
3223
3224         return NOTIFY_DONE;
3225 }
3226
3227 static int bond_slave_netdev_event(unsigned long event,
3228                                    struct net_device *slave_dev)
3229 {
3230         struct net_device *bond_dev = slave_dev->master;
3231         struct bonding *bond = netdev_priv(bond_dev);
3232         struct slave *slave = NULL;
3233
3234         switch (event) {
3235         case NETDEV_UNREGISTER:
3236                 if (bond_dev) {
3237                         if (bond->setup_by_slave)
3238                                 bond_release_and_destroy(bond_dev, slave_dev);
3239                         else
3240                                 bond_release(bond_dev, slave_dev);
3241                 }
3242                 break;
3243         case NETDEV_UP:
3244         case NETDEV_CHANGE:
3245                 slave = bond_get_slave_by_dev(bond, slave_dev);
3246                 if (slave) {
3247                         u32 old_speed = slave->speed;
3248                         u8  old_duplex = slave->duplex;
3249
3250                         bond_update_speed_duplex(slave);
3251
3252                         if (bond->params.mode == BOND_MODE_8023AD) {
3253                                 if (old_speed != slave->speed)
3254                                         bond_3ad_adapter_speed_changed(slave);
3255                                 if (old_duplex != slave->duplex)
3256                                         bond_3ad_adapter_duplex_changed(slave);
3257                         }
3258                 }
3259
3260                 break;
3261         case NETDEV_DOWN:
3262                 /*
3263                  * ... Or is it this?
3264                  */
3265                 break;
3266         case NETDEV_CHANGEMTU:
3267                 /*
3268                  * TODO: Should slaves be allowed to
3269                  * independently alter their MTU?  For
3270                  * an active-backup bond, slaves need
3271                  * not be the same type of device, so
3272                  * MTUs may vary.  For other modes,
3273                  * slaves arguably should have the
3274                  * same MTUs. To do this, we'd need to
3275                  * take over the slave's change_mtu
3276                  * function for the duration of their
3277                  * servitude.
3278                  */
3279                 break;
3280         case NETDEV_CHANGENAME:
3281                 /*
3282                  * TODO: handle changing the primary's name
3283                  */
3284                 break;
3285         case NETDEV_FEAT_CHANGE:
3286                 bond_compute_features(bond);
3287                 break;
3288         default:
3289                 break;
3290         }
3291
3292         return NOTIFY_DONE;
3293 }
3294
3295 /*
3296  * bond_netdev_event: handle netdev notifier chain events.
3297  *
3298  * This function receives events for the netdev chain.  The caller (an
3299  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3300  * locks for us to safely manipulate the slave devices (RTNL lock,
3301  * dev_probe_lock).
3302  */
3303 static int bond_netdev_event(struct notifier_block *this,
3304                              unsigned long event, void *ptr)
3305 {
3306         struct net_device *event_dev = (struct net_device *)ptr;
3307
3308         pr_debug("event_dev: %s, event: %lx\n",
3309                  event_dev ? event_dev->name : "None",
3310                  event);
3311
3312         if (!(event_dev->priv_flags & IFF_BONDING))
3313                 return NOTIFY_DONE;
3314
3315         if (event_dev->flags & IFF_MASTER) {
3316                 pr_debug("IFF_MASTER\n");
3317                 return bond_master_netdev_event(event, event_dev);
3318         }
3319
3320         if (event_dev->flags & IFF_SLAVE) {
3321                 pr_debug("IFF_SLAVE\n");
3322                 return bond_slave_netdev_event(event, event_dev);
3323         }
3324
3325         return NOTIFY_DONE;
3326 }
3327
3328 static struct notifier_block bond_netdev_notifier = {
3329         .notifier_call = bond_netdev_event,
3330 };
3331
3332 /*---------------------------- Hashing Policies -----------------------------*/
3333
3334 /*
3335  * Hash for the output device based upon layer 2 and layer 3 data. If
3336  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3337  */
3338 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3339 {
3340         struct ethhdr *data = (struct ethhdr *)skb->data;
3341         struct iphdr *iph = ip_hdr(skb);
3342
3343         if (skb->protocol == htons(ETH_P_IP)) {
3344                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3345                         (data->h_dest[5] ^ data->h_source[5])) % count;
3346         }
3347
3348         return (data->h_dest[5] ^ data->h_source[5]) % count;
3349 }
3350
3351 /*
3352  * Hash for the output device based upon layer 3 and layer 4 data. If
3353  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3354  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3355  */
3356 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3357 {
3358         struct ethhdr *data = (struct ethhdr *)skb->data;
3359         struct iphdr *iph = ip_hdr(skb);
3360         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3361         int layer4_xor = 0;
3362
3363         if (skb->protocol == htons(ETH_P_IP)) {
3364                 if (!ip_is_fragment(iph) &&
3365                     (iph->protocol == IPPROTO_TCP ||
3366                      iph->protocol == IPPROTO_UDP)) {
3367                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3368                 }
3369                 return (layer4_xor ^
3370                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3371
3372         }
3373
3374         return (data->h_dest[5] ^ data->h_source[5]) % count;
3375 }
3376
3377 /*
3378  * Hash for the output device based upon layer 2 data
3379  */
3380 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3381 {
3382         struct ethhdr *data = (struct ethhdr *)skb->data;
3383
3384         return (data->h_dest[5] ^ data->h_source[5]) % count;
3385 }
3386
3387 /*-------------------------- Device entry points ----------------------------*/
3388
3389 static int bond_open(struct net_device *bond_dev)
3390 {
3391         struct bonding *bond = netdev_priv(bond_dev);
3392         struct slave *slave;
3393         int i;
3394
3395         /* reset slave->backup and slave->inactive */
3396         read_lock(&bond->lock);
3397         if (bond->slave_cnt > 0) {
3398                 read_lock(&bond->curr_slave_lock);
3399                 bond_for_each_slave(bond, slave, i) {
3400                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3401                                 && (slave != bond->curr_active_slave)) {
3402                                 bond_set_slave_inactive_flags(slave);
3403                         } else {
3404                                 bond_set_slave_active_flags(slave);
3405                         }
3406                 }
3407                 read_unlock(&bond->curr_slave_lock);
3408         }
3409         read_unlock(&bond->lock);
3410
3411         INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3412
3413         if (bond_is_lb(bond)) {
3414                 /* bond_alb_initialize must be called before the timer
3415                  * is started.
3416                  */
3417                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3418                         /* something went wrong - fail the open operation */
3419                         return -ENOMEM;
3420                 }
3421
3422                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3423                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3424         }
3425
3426         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3427                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3428                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3429         }
3430
3431         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3432                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3433                         INIT_DELAYED_WORK(&bond->arp_work,
3434                                           bond_activebackup_arp_mon);
3435                 else
3436                         INIT_DELAYED_WORK(&bond->arp_work,
3437                                           bond_loadbalance_arp_mon);
3438
3439                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3440                 if (bond->params.arp_validate)
3441                         bond->recv_probe = bond_arp_rcv;
3442         }
3443
3444         if (bond->params.mode == BOND_MODE_8023AD) {
3445                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3446                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3447                 /* register to receive LACPDUs */
3448                 bond->recv_probe = bond_3ad_lacpdu_recv;
3449                 bond_3ad_initiate_agg_selection(bond, 1);
3450         }
3451
3452         return 0;
3453 }
3454
3455 static int bond_close(struct net_device *bond_dev)
3456 {
3457         struct bonding *bond = netdev_priv(bond_dev);
3458
3459         write_lock_bh(&bond->lock);
3460
3461         bond->send_peer_notif = 0;
3462
3463         write_unlock_bh(&bond->lock);
3464
3465         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3466                 cancel_delayed_work_sync(&bond->mii_work);
3467         }
3468
3469         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3470                 cancel_delayed_work_sync(&bond->arp_work);
3471         }
3472
3473         switch (bond->params.mode) {
3474         case BOND_MODE_8023AD:
3475                 cancel_delayed_work_sync(&bond->ad_work);
3476                 break;
3477         case BOND_MODE_TLB:
3478         case BOND_MODE_ALB:
3479                 cancel_delayed_work_sync(&bond->alb_work);
3480                 break;
3481         default:
3482                 break;
3483         }
3484
3485         if (delayed_work_pending(&bond->mcast_work))
3486                 cancel_delayed_work_sync(&bond->mcast_work);
3487
3488         if (bond_is_lb(bond)) {
3489                 /* Must be called only after all
3490                  * slaves have been released
3491                  */
3492                 bond_alb_deinitialize(bond);
3493         }
3494         bond->recv_probe = NULL;
3495
3496         return 0;
3497 }
3498
3499 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3500                                                 struct rtnl_link_stats64 *stats)
3501 {
3502         struct bonding *bond = netdev_priv(bond_dev);
3503         struct rtnl_link_stats64 temp;
3504         struct slave *slave;
3505         int i;
3506
3507         memset(stats, 0, sizeof(*stats));
3508
3509         read_lock_bh(&bond->lock);
3510
3511         bond_for_each_slave(bond, slave, i) {
3512                 const struct rtnl_link_stats64 *sstats =
3513                         dev_get_stats(slave->dev, &temp);
3514
3515                 stats->rx_packets += sstats->rx_packets;
3516                 stats->rx_bytes += sstats->rx_bytes;
3517                 stats->rx_errors += sstats->rx_errors;
3518                 stats->rx_dropped += sstats->rx_dropped;
3519
3520                 stats->tx_packets += sstats->tx_packets;
3521                 stats->tx_bytes += sstats->tx_bytes;
3522                 stats->tx_errors += sstats->tx_errors;
3523                 stats->tx_dropped += sstats->tx_dropped;
3524
3525                 stats->multicast += sstats->multicast;
3526                 stats->collisions += sstats->collisions;
3527
3528                 stats->rx_length_errors += sstats->rx_length_errors;
3529                 stats->rx_over_errors += sstats->rx_over_errors;
3530                 stats->rx_crc_errors += sstats->rx_crc_errors;
3531                 stats->rx_frame_errors += sstats->rx_frame_errors;
3532                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3533                 stats->rx_missed_errors += sstats->rx_missed_errors;
3534
3535                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3536                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3537                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3538                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3539                 stats->tx_window_errors += sstats->tx_window_errors;
3540         }
3541
3542         read_unlock_bh(&bond->lock);
3543
3544         return stats;
3545 }
3546
3547 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3548 {
3549         struct net_device *slave_dev = NULL;
3550         struct ifbond k_binfo;
3551         struct ifbond __user *u_binfo = NULL;
3552         struct ifslave k_sinfo;
3553         struct ifslave __user *u_sinfo = NULL;
3554         struct mii_ioctl_data *mii = NULL;
3555         int res = 0;
3556
3557         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3558
3559         switch (cmd) {
3560         case SIOCGMIIPHY:
3561                 mii = if_mii(ifr);
3562                 if (!mii)
3563                         return -EINVAL;
3564
3565                 mii->phy_id = 0;
3566                 /* Fall Through */
3567         case SIOCGMIIREG:
3568                 /*
3569                  * We do this again just in case we were called by SIOCGMIIREG
3570                  * instead of SIOCGMIIPHY.
3571                  */
3572                 mii = if_mii(ifr);
3573                 if (!mii)
3574                         return -EINVAL;
3575
3576
3577                 if (mii->reg_num == 1) {
3578                         struct bonding *bond = netdev_priv(bond_dev);
3579                         mii->val_out = 0;
3580                         read_lock(&bond->lock);
3581                         read_lock(&bond->curr_slave_lock);
3582                         if (netif_carrier_ok(bond->dev))
3583                                 mii->val_out = BMSR_LSTATUS;
3584
3585                         read_unlock(&bond->curr_slave_lock);
3586                         read_unlock(&bond->lock);
3587                 }
3588
3589                 return 0;
3590         case BOND_INFO_QUERY_OLD:
3591         case SIOCBONDINFOQUERY:
3592                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3593
3594                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3595                         return -EFAULT;
3596
3597                 res = bond_info_query(bond_dev, &k_binfo);
3598                 if (res == 0 &&
3599                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3600                         return -EFAULT;
3601
3602                 return res;
3603         case BOND_SLAVE_INFO_QUERY_OLD:
3604         case SIOCBONDSLAVEINFOQUERY:
3605                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3606
3607                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3608                         return -EFAULT;
3609
3610                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3611                 if (res == 0 &&
3612                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3613                         return -EFAULT;
3614
3615                 return res;
3616         default:
3617                 /* Go on */
3618                 break;
3619         }
3620
3621         if (!capable(CAP_NET_ADMIN))
3622                 return -EPERM;
3623
3624         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3625
3626         pr_debug("slave_dev=%p:\n", slave_dev);
3627
3628         if (!slave_dev)
3629                 res = -ENODEV;
3630         else {
3631                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3632                 switch (cmd) {
3633                 case BOND_ENSLAVE_OLD:
3634                 case SIOCBONDENSLAVE:
3635                         res = bond_enslave(bond_dev, slave_dev);
3636                         break;
3637                 case BOND_RELEASE_OLD:
3638                 case SIOCBONDRELEASE:
3639                         res = bond_release(bond_dev, slave_dev);
3640                         break;
3641                 case BOND_SETHWADDR_OLD:
3642                 case SIOCBONDSETHWADDR:
3643                         res = bond_sethwaddr(bond_dev, slave_dev);
3644                         break;
3645                 case BOND_CHANGE_ACTIVE_OLD:
3646                 case SIOCBONDCHANGEACTIVE:
3647                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3648                         break;
3649                 default:
3650                         res = -EOPNOTSUPP;
3651                 }
3652
3653                 dev_put(slave_dev);
3654         }
3655
3656         return res;
3657 }
3658
3659 static bool bond_addr_in_mc_list(unsigned char *addr,
3660                                  struct netdev_hw_addr_list *list,
3661                                  int addrlen)
3662 {
3663         struct netdev_hw_addr *ha;
3664
3665         netdev_hw_addr_list_for_each(ha, list)
3666                 if (!memcmp(ha->addr, addr, addrlen))
3667                         return true;
3668
3669         return false;
3670 }
3671
3672 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3673 {
3674         struct bonding *bond = netdev_priv(bond_dev);
3675
3676         if (change & IFF_PROMISC)
3677                 bond_set_promiscuity(bond,
3678                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3679
3680         if (change & IFF_ALLMULTI)
3681                 bond_set_allmulti(bond,
3682                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3683 }
3684
3685 static void bond_set_multicast_list(struct net_device *bond_dev)
3686 {
3687         struct bonding *bond = netdev_priv(bond_dev);
3688         struct netdev_hw_addr *ha;
3689         bool found;
3690
3691         read_lock(&bond->lock);
3692
3693         /* looking for addresses to add to slaves' mc list */
3694         netdev_for_each_mc_addr(ha, bond_dev) {
3695                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3696                                              bond_dev->addr_len);
3697                 if (!found)
3698                         bond_mc_add(bond, ha->addr);
3699         }
3700
3701         /* looking for addresses to delete from slaves' list */
3702         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3703                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3704                                              bond_dev->addr_len);
3705                 if (!found)
3706                         bond_mc_del(bond, ha->addr);
3707         }
3708
3709         /* save master's multicast list */
3710         __hw_addr_flush(&bond->mc_list);
3711         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3712                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3713
3714         read_unlock(&bond->lock);
3715 }
3716
3717 static int bond_neigh_init(struct neighbour *n)
3718 {
3719         struct bonding *bond = netdev_priv(n->dev);
3720         struct slave *slave = bond->first_slave;
3721         const struct net_device_ops *slave_ops;
3722         struct neigh_parms parms;
3723         int ret;
3724
3725         if (!slave)
3726                 return 0;
3727
3728         slave_ops = slave->dev->netdev_ops;
3729
3730         if (!slave_ops->ndo_neigh_setup)
3731                 return 0;
3732
3733         parms.neigh_setup = NULL;
3734         parms.neigh_cleanup = NULL;
3735         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3736         if (ret)
3737                 return ret;
3738
3739         /*
3740          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3741          * after the last slave has been detached.  Assumes that all slaves
3742          * utilize the same neigh_cleanup (true at this writing as only user
3743          * is ipoib).
3744          */
3745         n->parms->neigh_cleanup = parms.neigh_cleanup;
3746
3747         if (!parms.neigh_setup)
3748                 return 0;
3749
3750         return parms.neigh_setup(n);
3751 }
3752
3753 /*
3754  * The bonding ndo_neigh_setup is called at init time beofre any
3755  * slave exists. So we must declare proxy setup function which will
3756  * be used at run time to resolve the actual slave neigh param setup.
3757  */
3758 static int bond_neigh_setup(struct net_device *dev,
3759                             struct neigh_parms *parms)
3760 {
3761         parms->neigh_setup   = bond_neigh_init;
3762
3763         return 0;
3764 }
3765
3766 /*
3767  * Change the MTU of all of a master's slaves to match the master
3768  */
3769 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3770 {
3771         struct bonding *bond = netdev_priv(bond_dev);
3772         struct slave *slave, *stop_at;
3773         int res = 0;
3774         int i;
3775
3776         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3777                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3778
3779         /* Can't hold bond->lock with bh disabled here since
3780          * some base drivers panic. On the other hand we can't
3781          * hold bond->lock without bh disabled because we'll
3782          * deadlock. The only solution is to rely on the fact
3783          * that we're under rtnl_lock here, and the slaves
3784          * list won't change. This doesn't solve the problem
3785          * of setting the slave's MTU while it is
3786          * transmitting, but the assumption is that the base
3787          * driver can handle that.
3788          *
3789          * TODO: figure out a way to safely iterate the slaves
3790          * list, but without holding a lock around the actual
3791          * call to the base driver.
3792          */
3793
3794         bond_for_each_slave(bond, slave, i) {
3795                 pr_debug("s %p s->p %p c_m %p\n",
3796                          slave,
3797                          slave->prev,
3798                          slave->dev->netdev_ops->ndo_change_mtu);
3799
3800                 res = dev_set_mtu(slave->dev, new_mtu);
3801
3802                 if (res) {
3803                         /* If we failed to set the slave's mtu to the new value
3804                          * we must abort the operation even in ACTIVE_BACKUP
3805                          * mode, because if we allow the backup slaves to have
3806                          * different mtu values than the active slave we'll
3807                          * need to change their mtu when doing a failover. That
3808                          * means changing their mtu from timer context, which
3809                          * is probably not a good idea.
3810                          */
3811                         pr_debug("err %d %s\n", res, slave->dev->name);
3812                         goto unwind;
3813                 }
3814         }
3815
3816         bond_dev->mtu = new_mtu;
3817
3818         return 0;
3819
3820 unwind:
3821         /* unwind from head to the slave that failed */
3822         stop_at = slave;
3823         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3824                 int tmp_res;
3825
3826                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3827                 if (tmp_res) {
3828                         pr_debug("unwind err %d dev %s\n",
3829                                  tmp_res, slave->dev->name);
3830                 }
3831         }
3832
3833         return res;
3834 }
3835
3836 /*
3837  * Change HW address
3838  *
3839  * Note that many devices must be down to change the HW address, and
3840  * downing the master releases all slaves.  We can make bonds full of
3841  * bonding devices to test this, however.
3842  */
3843 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3844 {
3845         struct bonding *bond = netdev_priv(bond_dev);
3846         struct sockaddr *sa = addr, tmp_sa;
3847         struct slave *slave, *stop_at;
3848         int res = 0;
3849         int i;
3850
3851         if (bond->params.mode == BOND_MODE_ALB)
3852                 return bond_alb_set_mac_address(bond_dev, addr);
3853
3854
3855         pr_debug("bond=%p, name=%s\n",
3856                  bond, bond_dev ? bond_dev->name : "None");
3857
3858         /*
3859          * If fail_over_mac is set to active, do nothing and return
3860          * success.  Returning an error causes ifenslave to fail.
3861          */
3862         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3863                 return 0;
3864
3865         if (!is_valid_ether_addr(sa->sa_data))
3866                 return -EADDRNOTAVAIL;
3867
3868         /* Can't hold bond->lock with bh disabled here since
3869          * some base drivers panic. On the other hand we can't
3870          * hold bond->lock without bh disabled because we'll
3871          * deadlock. The only solution is to rely on the fact
3872          * that we're under rtnl_lock here, and the slaves
3873          * list won't change. This doesn't solve the problem
3874          * of setting the slave's hw address while it is
3875          * transmitting, but the assumption is that the base
3876          * driver can handle that.
3877          *
3878          * TODO: figure out a way to safely iterate the slaves
3879          * list, but without holding a lock around the actual
3880          * call to the base driver.
3881          */
3882
3883         bond_for_each_slave(bond, slave, i) {
3884                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3885                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3886
3887                 if (slave_ops->ndo_set_mac_address == NULL) {
3888                         res = -EOPNOTSUPP;
3889                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3890                         goto unwind;
3891                 }
3892
3893                 res = dev_set_mac_address(slave->dev, addr);
3894                 if (res) {
3895                         /* TODO: consider downing the slave
3896                          * and retry ?
3897                          * User should expect communications
3898                          * breakage anyway until ARP finish
3899                          * updating, so...
3900                          */
3901                         pr_debug("err %d %s\n", res, slave->dev->name);
3902                         goto unwind;
3903                 }
3904         }
3905
3906         /* success */
3907         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3908         return 0;
3909
3910 unwind:
3911         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3912         tmp_sa.sa_family = bond_dev->type;
3913
3914         /* unwind from head to the slave that failed */
3915         stop_at = slave;
3916         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3917                 int tmp_res;
3918
3919                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3920                 if (tmp_res) {
3921                         pr_debug("unwind err %d dev %s\n",
3922                                  tmp_res, slave->dev->name);
3923                 }
3924         }
3925
3926         return res;
3927 }
3928
3929 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3930 {
3931         struct bonding *bond = netdev_priv(bond_dev);
3932         struct slave *slave, *start_at;
3933         int i, slave_no, res = 1;
3934         struct iphdr *iph = ip_hdr(skb);
3935
3936         /*
3937          * Start with the curr_active_slave that joined the bond as the
3938          * default for sending IGMP traffic.  For failover purposes one
3939          * needs to maintain some consistency for the interface that will
3940          * send the join/membership reports.  The curr_active_slave found
3941          * will send all of this type of traffic.
3942          */
3943         if ((iph->protocol == IPPROTO_IGMP) &&
3944             (skb->protocol == htons(ETH_P_IP))) {
3945
3946                 read_lock(&bond->curr_slave_lock);
3947                 slave = bond->curr_active_slave;
3948                 read_unlock(&bond->curr_slave_lock);
3949
3950                 if (!slave)
3951                         goto out;
3952         } else {
3953                 /*
3954                  * Concurrent TX may collide on rr_tx_counter; we accept
3955                  * that as being rare enough not to justify using an
3956                  * atomic op here.
3957                  */
3958                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3959
3960                 bond_for_each_slave(bond, slave, i) {
3961                         slave_no--;
3962                         if (slave_no < 0)
3963                                 break;
3964                 }
3965         }
3966
3967         start_at = slave;
3968         bond_for_each_slave_from(bond, slave, i, start_at) {
3969                 if (IS_UP(slave->dev) &&
3970                     (slave->link == BOND_LINK_UP) &&
3971                     bond_is_active_slave(slave)) {
3972                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3973                         break;
3974                 }
3975         }
3976
3977 out:
3978         if (res) {
3979                 /* no suitable interface, frame not sent */
3980                 dev_kfree_skb(skb);
3981         }
3982
3983         return NETDEV_TX_OK;
3984 }
3985
3986
3987 /*
3988  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3989  * the bond has a usable interface.
3990  */
3991 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3992 {
3993         struct bonding *bond = netdev_priv(bond_dev);
3994         int res = 1;
3995
3996         read_lock(&bond->curr_slave_lock);
3997
3998         if (bond->curr_active_slave)
3999                 res = bond_dev_queue_xmit(bond, skb,
4000                         bond->curr_active_slave->dev);
4001
4002         if (res)
4003                 /* no suitable interface, frame not sent */
4004                 dev_kfree_skb(skb);
4005
4006         read_unlock(&bond->curr_slave_lock);
4007
4008         return NETDEV_TX_OK;
4009 }
4010
4011 /*
4012  * In bond_xmit_xor() , we determine the output device by using a pre-
4013  * determined xmit_hash_policy(), If the selected device is not enabled,
4014  * find the next active slave.
4015  */
4016 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4017 {
4018         struct bonding *bond = netdev_priv(bond_dev);
4019         struct slave *slave, *start_at;
4020         int slave_no;
4021         int i;
4022         int res = 1;
4023
4024         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4025
4026         bond_for_each_slave(bond, slave, i) {
4027                 slave_no--;
4028                 if (slave_no < 0)
4029                         break;
4030         }
4031
4032         start_at = slave;
4033
4034         bond_for_each_slave_from(bond, slave, i, start_at) {
4035                 if (IS_UP(slave->dev) &&
4036                     (slave->link == BOND_LINK_UP) &&
4037                     bond_is_active_slave(slave)) {
4038                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4039                         break;
4040                 }
4041         }
4042
4043         if (res) {
4044                 /* no suitable interface, frame not sent */
4045                 dev_kfree_skb(skb);
4046         }
4047
4048         return NETDEV_TX_OK;
4049 }
4050
4051 /*
4052  * in broadcast mode, we send everything to all usable interfaces.
4053  */
4054 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4055 {
4056         struct bonding *bond = netdev_priv(bond_dev);
4057         struct slave *slave, *start_at;
4058         struct net_device *tx_dev = NULL;
4059         int i;
4060         int res = 1;
4061
4062         read_lock(&bond->curr_slave_lock);
4063         start_at = bond->curr_active_slave;
4064         read_unlock(&bond->curr_slave_lock);
4065
4066         if (!start_at)
4067                 goto out;
4068
4069         bond_for_each_slave_from(bond, slave, i, start_at) {
4070                 if (IS_UP(slave->dev) &&
4071                     (slave->link == BOND_LINK_UP) &&
4072                     bond_is_active_slave(slave)) {
4073                         if (tx_dev) {
4074                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4075                                 if (!skb2) {
4076                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4077                                                bond_dev->name);
4078                                         continue;
4079                                 }
4080
4081                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4082                                 if (res) {
4083                                         dev_kfree_skb(skb2);
4084                                         continue;
4085                                 }
4086                         }
4087                         tx_dev = slave->dev;
4088                 }
4089         }
4090
4091         if (tx_dev)
4092                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4093
4094 out:
4095         if (res)
4096                 /* no suitable interface, frame not sent */
4097                 dev_kfree_skb(skb);
4098
4099         /* frame sent to all suitable interfaces */
4100         return NETDEV_TX_OK;
4101 }
4102
4103 /*------------------------- Device initialization ---------------------------*/
4104
4105 static void bond_set_xmit_hash_policy(struct bonding *bond)
4106 {
4107         switch (bond->params.xmit_policy) {
4108         case BOND_XMIT_POLICY_LAYER23:
4109                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4110                 break;
4111         case BOND_XMIT_POLICY_LAYER34:
4112                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4113                 break;
4114         case BOND_XMIT_POLICY_LAYER2:
4115         default:
4116                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4117                 break;
4118         }
4119 }
4120
4121 /*
4122  * Lookup the slave that corresponds to a qid
4123  */
4124 static inline int bond_slave_override(struct bonding *bond,
4125                                       struct sk_buff *skb)
4126 {
4127         int i, res = 1;
4128         struct slave *slave = NULL;
4129         struct slave *check_slave;
4130
4131         if (!skb->queue_mapping)
4132                 return 1;
4133
4134         /* Find out if any slaves have the same mapping as this skb. */
4135         bond_for_each_slave(bond, check_slave, i) {
4136                 if (check_slave->queue_id == skb->queue_mapping) {
4137                         slave = check_slave;
4138                         break;
4139                 }
4140         }
4141
4142         /* If the slave isn't UP, use default transmit policy. */
4143         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4144             (slave->link == BOND_LINK_UP)) {
4145                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4146         }
4147
4148         return res;
4149 }
4150
4151
4152 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4153 {
4154         /*
4155          * This helper function exists to help dev_pick_tx get the correct
4156          * destination queue.  Using a helper function skips a call to
4157          * skb_tx_hash and will put the skbs in the queue we expect on their
4158          * way down to the bonding driver.
4159          */
4160         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4161
4162         /*
4163          * Save the original txq to restore before passing to the driver
4164          */
4165         bond_queue_mapping(skb) = skb->queue_mapping;
4166
4167         if (unlikely(txq >= dev->real_num_tx_queues)) {
4168                 do {
4169                         txq -= dev->real_num_tx_queues;
4170                 } while (txq >= dev->real_num_tx_queues);
4171         }
4172         return txq;
4173 }
4174
4175 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4176 {
4177         struct bonding *bond = netdev_priv(dev);
4178
4179         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4180                 if (!bond_slave_override(bond, skb))
4181                         return NETDEV_TX_OK;
4182         }
4183
4184         switch (bond->params.mode) {
4185         case BOND_MODE_ROUNDROBIN:
4186                 return bond_xmit_roundrobin(skb, dev);
4187         case BOND_MODE_ACTIVEBACKUP:
4188                 return bond_xmit_activebackup(skb, dev);
4189         case BOND_MODE_XOR:
4190                 return bond_xmit_xor(skb, dev);
4191         case BOND_MODE_BROADCAST:
4192                 return bond_xmit_broadcast(skb, dev);
4193         case BOND_MODE_8023AD:
4194                 return bond_3ad_xmit_xor(skb, dev);
4195         case BOND_MODE_ALB:
4196         case BOND_MODE_TLB:
4197                 return bond_alb_xmit(skb, dev);
4198         default:
4199                 /* Should never happen, mode already checked */
4200                 pr_err("%s: Error: Unknown bonding mode %d\n",
4201                        dev->name, bond->params.mode);
4202                 WARN_ON_ONCE(1);
4203                 dev_kfree_skb(skb);
4204                 return NETDEV_TX_OK;
4205         }
4206 }
4207
4208 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4209 {
4210         struct bonding *bond = netdev_priv(dev);
4211         netdev_tx_t ret = NETDEV_TX_OK;
4212
4213         /*
4214          * If we risk deadlock from transmitting this in the
4215          * netpoll path, tell netpoll to queue the frame for later tx
4216          */
4217         if (is_netpoll_tx_blocked(dev))
4218                 return NETDEV_TX_BUSY;
4219
4220         read_lock(&bond->lock);
4221
4222         if (bond->slave_cnt)
4223                 ret = __bond_start_xmit(skb, dev);
4224         else
4225                 dev_kfree_skb(skb);
4226
4227         read_unlock(&bond->lock);
4228
4229         return ret;
4230 }
4231
4232 /*
4233  * set bond mode specific net device operations
4234  */
4235 void bond_set_mode_ops(struct bonding *bond, int mode)
4236 {
4237         struct net_device *bond_dev = bond->dev;
4238
4239         switch (mode) {
4240         case BOND_MODE_ROUNDROBIN:
4241                 break;
4242         case BOND_MODE_ACTIVEBACKUP:
4243                 break;
4244         case BOND_MODE_XOR:
4245                 bond_set_xmit_hash_policy(bond);
4246                 break;
4247         case BOND_MODE_BROADCAST:
4248                 break;
4249         case BOND_MODE_8023AD:
4250                 bond_set_xmit_hash_policy(bond);
4251                 break;
4252         case BOND_MODE_ALB:
4253                 /* FALLTHRU */
4254         case BOND_MODE_TLB:
4255                 break;
4256         default:
4257                 /* Should never happen, mode already checked */
4258                 pr_err("%s: Error: Unknown bonding mode %d\n",
4259                        bond_dev->name, mode);
4260                 break;
4261         }
4262 }
4263
4264 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4265                                     struct ethtool_drvinfo *drvinfo)
4266 {
4267         strncpy(drvinfo->driver, DRV_NAME, 32);
4268         strncpy(drvinfo->version, DRV_VERSION, 32);
4269         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4270 }
4271
4272 static const struct ethtool_ops bond_ethtool_ops = {
4273         .get_drvinfo            = bond_ethtool_get_drvinfo,
4274         .get_link               = ethtool_op_get_link,
4275 };
4276
4277 static const struct net_device_ops bond_netdev_ops = {
4278         .ndo_init               = bond_init,
4279         .ndo_uninit             = bond_uninit,
4280         .ndo_open               = bond_open,
4281         .ndo_stop               = bond_close,
4282         .ndo_start_xmit         = bond_start_xmit,
4283         .ndo_select_queue       = bond_select_queue,
4284         .ndo_get_stats64        = bond_get_stats,
4285         .ndo_do_ioctl           = bond_do_ioctl,
4286         .ndo_change_rx_flags    = bond_change_rx_flags,
4287         .ndo_set_rx_mode        = bond_set_multicast_list,
4288         .ndo_change_mtu         = bond_change_mtu,
4289         .ndo_set_mac_address    = bond_set_mac_address,
4290         .ndo_neigh_setup        = bond_neigh_setup,
4291         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4292         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4293 #ifdef CONFIG_NET_POLL_CONTROLLER
4294         .ndo_netpoll_setup      = bond_netpoll_setup,
4295         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4296         .ndo_poll_controller    = bond_poll_controller,
4297 #endif
4298         .ndo_add_slave          = bond_enslave,
4299         .ndo_del_slave          = bond_release,
4300         .ndo_fix_features       = bond_fix_features,
4301 };
4302
4303 static void bond_destructor(struct net_device *bond_dev)
4304 {
4305         struct bonding *bond = netdev_priv(bond_dev);
4306         if (bond->wq)
4307                 destroy_workqueue(bond->wq);
4308         free_netdev(bond_dev);
4309 }
4310
4311 static void bond_setup(struct net_device *bond_dev)
4312 {
4313         struct bonding *bond = netdev_priv(bond_dev);
4314
4315         /* initialize rwlocks */
4316         rwlock_init(&bond->lock);
4317         rwlock_init(&bond->curr_slave_lock);
4318
4319         bond->params = bonding_defaults;
4320
4321         /* Initialize pointers */
4322         bond->dev = bond_dev;
4323         INIT_LIST_HEAD(&bond->vlan_list);
4324
4325         /* Initialize the device entry points */
4326         ether_setup(bond_dev);
4327         bond_dev->netdev_ops = &bond_netdev_ops;
4328         bond_dev->ethtool_ops = &bond_ethtool_ops;
4329         bond_set_mode_ops(bond, bond->params.mode);
4330
4331         bond_dev->destructor = bond_destructor;
4332
4333         /* Initialize the device options */
4334         bond_dev->tx_queue_len = 0;
4335         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4336         bond_dev->priv_flags |= IFF_BONDING;
4337         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4338
4339         /* At first, we block adding VLANs. That's the only way to
4340          * prevent problems that occur when adding VLANs over an
4341          * empty bond. The block will be removed once non-challenged
4342          * slaves are enslaved.
4343          */
4344         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4345
4346         /* don't acquire bond device's netif_tx_lock when
4347          * transmitting */
4348         bond_dev->features |= NETIF_F_LLTX;
4349
4350         /* By default, we declare the bond to be fully
4351          * VLAN hardware accelerated capable. Special
4352          * care is taken in the various xmit functions
4353          * when there are slaves that are not hw accel
4354          * capable
4355          */
4356
4357         bond_dev->hw_features = BOND_VLAN_FEATURES |
4358                                 NETIF_F_HW_VLAN_TX |
4359                                 NETIF_F_HW_VLAN_RX |
4360                                 NETIF_F_HW_VLAN_FILTER;
4361
4362         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4363         bond_dev->features |= bond_dev->hw_features;
4364 }
4365
4366 static void bond_work_cancel_all(struct bonding *bond)
4367 {
4368         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4369                 cancel_delayed_work_sync(&bond->mii_work);
4370
4371         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4372                 cancel_delayed_work_sync(&bond->arp_work);
4373
4374         if (bond->params.mode == BOND_MODE_ALB &&
4375             delayed_work_pending(&bond->alb_work))
4376                 cancel_delayed_work_sync(&bond->alb_work);
4377
4378         if (bond->params.mode == BOND_MODE_8023AD &&
4379             delayed_work_pending(&bond->ad_work))
4380                 cancel_delayed_work_sync(&bond->ad_work);
4381
4382         if (delayed_work_pending(&bond->mcast_work))
4383                 cancel_delayed_work_sync(&bond->mcast_work);
4384 }
4385
4386 /*
4387 * Destroy a bonding device.
4388 * Must be under rtnl_lock when this function is called.
4389 */
4390 static void bond_uninit(struct net_device *bond_dev)
4391 {
4392         struct bonding *bond = netdev_priv(bond_dev);
4393         struct vlan_entry *vlan, *tmp;
4394
4395         bond_netpoll_cleanup(bond_dev);
4396
4397         /* Release the bonded slaves */
4398         bond_release_all(bond_dev);
4399
4400         list_del(&bond->bond_list);
4401
4402         bond_work_cancel_all(bond);
4403
4404         bond_remove_proc_entry(bond);
4405
4406         bond_debug_unregister(bond);
4407
4408         __hw_addr_flush(&bond->mc_list);
4409
4410         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4411                 list_del(&vlan->vlan_list);
4412                 kfree(vlan);
4413         }
4414 }
4415
4416 /*------------------------- Module initialization ---------------------------*/
4417
4418 /*
4419  * Convert string input module parms.  Accept either the
4420  * number of the mode or its string name.  A bit complicated because
4421  * some mode names are substrings of other names, and calls from sysfs
4422  * may have whitespace in the name (trailing newlines, for example).
4423  */
4424 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4425 {
4426         int modeint = -1, i, rv;
4427         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4428
4429         for (p = (char *)buf; *p; p++)
4430                 if (!(isdigit(*p) || isspace(*p)))
4431                         break;
4432
4433         if (*p)
4434                 rv = sscanf(buf, "%20s", modestr);
4435         else
4436                 rv = sscanf(buf, "%d", &modeint);
4437
4438         if (!rv)
4439                 return -1;
4440
4441         for (i = 0; tbl[i].modename; i++) {
4442                 if (modeint == tbl[i].mode)
4443                         return tbl[i].mode;
4444                 if (strcmp(modestr, tbl[i].modename) == 0)
4445                         return tbl[i].mode;
4446         }
4447
4448         return -1;
4449 }
4450
4451 static int bond_check_params(struct bond_params *params)
4452 {
4453         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4454
4455         /*
4456          * Convert string parameters.
4457          */
4458         if (mode) {
4459                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4460                 if (bond_mode == -1) {
4461                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4462                                mode == NULL ? "NULL" : mode);
4463                         return -EINVAL;
4464                 }
4465         }
4466
4467         if (xmit_hash_policy) {
4468                 if ((bond_mode != BOND_MODE_XOR) &&
4469                     (bond_mode != BOND_MODE_8023AD)) {
4470                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4471                                bond_mode_name(bond_mode));
4472                 } else {
4473                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4474                                                         xmit_hashtype_tbl);
4475                         if (xmit_hashtype == -1) {
4476                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4477                                        xmit_hash_policy == NULL ? "NULL" :
4478                                        xmit_hash_policy);
4479                                 return -EINVAL;
4480                         }
4481                 }
4482         }
4483
4484         if (lacp_rate) {
4485                 if (bond_mode != BOND_MODE_8023AD) {
4486                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4487                                 bond_mode_name(bond_mode));
4488                 } else {
4489                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4490                         if (lacp_fast == -1) {
4491                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4492                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4493                                 return -EINVAL;
4494                         }
4495                 }
4496         }
4497
4498         if (ad_select) {
4499                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4500                 if (params->ad_select == -1) {
4501                         pr_err("Error: Invalid ad_select \"%s\"\n",
4502                                ad_select == NULL ? "NULL" : ad_select);
4503                         return -EINVAL;
4504                 }
4505
4506                 if (bond_mode != BOND_MODE_8023AD) {
4507                         pr_warning("ad_select param only affects 802.3ad mode\n");
4508                 }
4509         } else {
4510                 params->ad_select = BOND_AD_STABLE;
4511         }
4512
4513         if (max_bonds < 0) {
4514                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4515                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4516                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4517         }
4518
4519         if (miimon < 0) {
4520                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4521                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4522                 miimon = BOND_LINK_MON_INTERV;
4523         }
4524
4525         if (updelay < 0) {
4526                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4527                            updelay, INT_MAX);
4528                 updelay = 0;
4529         }
4530
4531         if (downdelay < 0) {
4532                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4533                            downdelay, INT_MAX);
4534                 downdelay = 0;
4535         }
4536
4537         if ((use_carrier != 0) && (use_carrier != 1)) {
4538                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4539                            use_carrier);
4540                 use_carrier = 1;
4541         }
4542
4543         if (num_peer_notif < 0 || num_peer_notif > 255) {
4544                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4545                            num_peer_notif);
4546                 num_peer_notif = 1;
4547         }
4548
4549         /* reset values for 802.3ad */
4550         if (bond_mode == BOND_MODE_8023AD) {
4551                 if (!miimon) {
4552                         pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4553                         pr_warning("Forcing miimon to 100msec\n");
4554                         miimon = 100;
4555                 }
4556         }
4557
4558         if (tx_queues < 1 || tx_queues > 255) {
4559                 pr_warning("Warning: tx_queues (%d) should be between "
4560                            "1 and 255, resetting to %d\n",
4561                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4562                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4563         }
4564
4565         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4566                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4567                            "not of valid value (0/1), so it was set to "
4568                            "0\n", all_slaves_active);
4569                 all_slaves_active = 0;
4570         }
4571
4572         if (resend_igmp < 0 || resend_igmp > 255) {
4573                 pr_warning("Warning: resend_igmp (%d) should be between "
4574                            "0 and 255, resetting to %d\n",
4575                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4576                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4577         }
4578
4579         /* reset values for TLB/ALB */
4580         if ((bond_mode == BOND_MODE_TLB) ||
4581             (bond_mode == BOND_MODE_ALB)) {
4582                 if (!miimon) {
4583                         pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n");
4584                         pr_warning("Forcing miimon to 100msec\n");
4585                         miimon = 100;
4586                 }
4587         }
4588
4589         if (bond_mode == BOND_MODE_ALB) {
4590                 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",
4591                           updelay);
4592         }
4593
4594         if (!miimon) {
4595                 if (updelay || downdelay) {
4596                         /* just warn the user the up/down delay will have
4597                          * no effect since miimon is zero...
4598                          */
4599                         pr_warning("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",
4600                                    updelay, downdelay);
4601                 }
4602         } else {
4603                 /* don't allow arp monitoring */
4604                 if (arp_interval) {
4605                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4606                                    miimon, arp_interval);
4607                         arp_interval = 0;
4608                 }
4609
4610                 if ((updelay % miimon) != 0) {
4611                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4612                                    updelay, miimon,
4613                                    (updelay / miimon) * miimon);
4614                 }
4615
4616                 updelay /= miimon;
4617
4618                 if ((downdelay % miimon) != 0) {
4619                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4620                                    downdelay, miimon,
4621                                    (downdelay / miimon) * miimon);
4622                 }
4623
4624                 downdelay /= miimon;
4625         }
4626
4627         if (arp_interval < 0) {
4628                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4629                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4630                 arp_interval = BOND_LINK_ARP_INTERV;
4631         }
4632
4633         for (arp_ip_count = 0;
4634              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4635              arp_ip_count++) {
4636                 /* not complete check, but should be good enough to
4637                    catch mistakes */
4638                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4639                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4640                                    arp_ip_target[arp_ip_count]);
4641                         arp_interval = 0;
4642                 } else {
4643                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4644                         arp_target[arp_ip_count] = ip;
4645                 }
4646         }
4647
4648         if (arp_interval && !arp_ip_count) {
4649                 /* don't allow arping if no arp_ip_target given... */
4650                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4651                            arp_interval);
4652                 arp_interval = 0;
4653         }
4654
4655         if (arp_validate) {
4656                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4657                         pr_err("arp_validate only supported in active-backup mode\n");
4658                         return -EINVAL;
4659                 }
4660                 if (!arp_interval) {
4661                         pr_err("arp_validate requires arp_interval\n");
4662                         return -EINVAL;
4663                 }
4664
4665                 arp_validate_value = bond_parse_parm(arp_validate,
4666                                                      arp_validate_tbl);
4667                 if (arp_validate_value == -1) {
4668                         pr_err("Error: invalid arp_validate \"%s\"\n",
4669                                arp_validate == NULL ? "NULL" : arp_validate);
4670                         return -EINVAL;
4671                 }
4672         } else
4673                 arp_validate_value = 0;
4674
4675         if (miimon) {
4676                 pr_info("MII link monitoring set to %d ms\n", miimon);
4677         } else if (arp_interval) {
4678                 int i;
4679
4680                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4681                         arp_interval,
4682                         arp_validate_tbl[arp_validate_value].modename,
4683                         arp_ip_count);
4684
4685                 for (i = 0; i < arp_ip_count; i++)
4686                         pr_info(" %s", arp_ip_target[i]);
4687
4688                 pr_info("\n");
4689
4690         } else if (max_bonds) {
4691                 /* miimon and arp_interval not set, we need one so things
4692                  * work as expected, see bonding.txt for details
4693                  */
4694                 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");
4695         }
4696
4697         if (primary && !USES_PRIMARY(bond_mode)) {
4698                 /* currently, using a primary only makes sense
4699                  * in active backup, TLB or ALB modes
4700                  */
4701                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4702                            primary, bond_mode_name(bond_mode));
4703                 primary = NULL;
4704         }
4705
4706         if (primary && primary_reselect) {
4707                 primary_reselect_value = bond_parse_parm(primary_reselect,
4708                                                          pri_reselect_tbl);
4709                 if (primary_reselect_value == -1) {
4710                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4711                                primary_reselect ==
4712                                         NULL ? "NULL" : primary_reselect);
4713                         return -EINVAL;
4714                 }
4715         } else {
4716                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4717         }
4718
4719         if (fail_over_mac) {
4720                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4721                                                       fail_over_mac_tbl);
4722                 if (fail_over_mac_value == -1) {
4723                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4724                                arp_validate == NULL ? "NULL" : arp_validate);
4725                         return -EINVAL;
4726                 }
4727
4728                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4729                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4730         } else {
4731                 fail_over_mac_value = BOND_FOM_NONE;
4732         }
4733
4734         /* fill params struct with the proper values */
4735         params->mode = bond_mode;
4736         params->xmit_policy = xmit_hashtype;
4737         params->miimon = miimon;
4738         params->num_peer_notif = num_peer_notif;
4739         params->arp_interval = arp_interval;
4740         params->arp_validate = arp_validate_value;
4741         params->updelay = updelay;
4742         params->downdelay = downdelay;
4743         params->use_carrier = use_carrier;
4744         params->lacp_fast = lacp_fast;
4745         params->primary[0] = 0;
4746         params->primary_reselect = primary_reselect_value;
4747         params->fail_over_mac = fail_over_mac_value;
4748         params->tx_queues = tx_queues;
4749         params->all_slaves_active = all_slaves_active;
4750         params->resend_igmp = resend_igmp;
4751         params->min_links = min_links;
4752
4753         if (primary) {
4754                 strncpy(params->primary, primary, IFNAMSIZ);
4755                 params->primary[IFNAMSIZ - 1] = 0;
4756         }
4757
4758         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4759
4760         return 0;
4761 }
4762
4763 static struct lock_class_key bonding_netdev_xmit_lock_key;
4764 static struct lock_class_key bonding_netdev_addr_lock_key;
4765
4766 static void bond_set_lockdep_class_one(struct net_device *dev,
4767                                        struct netdev_queue *txq,
4768                                        void *_unused)
4769 {
4770         lockdep_set_class(&txq->_xmit_lock,
4771                           &bonding_netdev_xmit_lock_key);
4772 }
4773
4774 static void bond_set_lockdep_class(struct net_device *dev)
4775 {
4776         lockdep_set_class(&dev->addr_list_lock,
4777                           &bonding_netdev_addr_lock_key);
4778         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4779 }
4780
4781 /*
4782  * Called from registration process
4783  */
4784 static int bond_init(struct net_device *bond_dev)
4785 {
4786         struct bonding *bond = netdev_priv(bond_dev);
4787         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4788         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4789
4790         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4791
4792         /*
4793          * Initialize locks that may be required during
4794          * en/deslave operations.  All of the bond_open work
4795          * (of which this is part) should really be moved to
4796          * a phase prior to dev_open
4797          */
4798         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4799         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4800
4801         bond->wq = create_singlethread_workqueue(bond_dev->name);
4802         if (!bond->wq)
4803                 return -ENOMEM;
4804
4805         bond_set_lockdep_class(bond_dev);
4806
4807         bond_create_proc_entry(bond);
4808         list_add_tail(&bond->bond_list, &bn->dev_list);
4809
4810         bond_prepare_sysfs_group(bond);
4811
4812         bond_debug_register(bond);
4813
4814         __hw_addr_init(&bond->mc_list);
4815         return 0;
4816 }
4817
4818 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4819 {
4820         if (tb[IFLA_ADDRESS]) {
4821                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4822                         return -EINVAL;
4823                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4824                         return -EADDRNOTAVAIL;
4825         }
4826         return 0;
4827 }
4828
4829 static int bond_get_tx_queues(struct net *net, struct nlattr *tb[],
4830                               unsigned int *num_queues,
4831                               unsigned int *real_num_queues)
4832 {
4833         *num_queues = tx_queues;
4834         return 0;
4835 }
4836
4837 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4838         .kind           = "bond",
4839         .priv_size      = sizeof(struct bonding),
4840         .setup          = bond_setup,
4841         .validate       = bond_validate,
4842         .get_tx_queues  = bond_get_tx_queues,
4843 };
4844
4845 /* Create a new bond based on the specified name and bonding parameters.
4846  * If name is NULL, obtain a suitable "bond%d" name for us.
4847  * Caller must NOT hold rtnl_lock; we need to release it here before we
4848  * set up our sysfs entries.
4849  */
4850 int bond_create(struct net *net, const char *name)
4851 {
4852         struct net_device *bond_dev;
4853         int res;
4854
4855         rtnl_lock();
4856
4857         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4858                                    name ? name : "bond%d",
4859                                    bond_setup, tx_queues);
4860         if (!bond_dev) {
4861                 pr_err("%s: eek! can't alloc netdev!\n", name);
4862                 rtnl_unlock();
4863                 return -ENOMEM;
4864         }
4865
4866         dev_net_set(bond_dev, net);
4867         bond_dev->rtnl_link_ops = &bond_link_ops;
4868
4869         res = register_netdevice(bond_dev);
4870
4871         netif_carrier_off(bond_dev);
4872
4873         rtnl_unlock();
4874         if (res < 0)
4875                 bond_destructor(bond_dev);
4876         return res;
4877 }
4878
4879 static int __net_init bond_net_init(struct net *net)
4880 {
4881         struct bond_net *bn = net_generic(net, bond_net_id);
4882
4883         bn->net = net;
4884         INIT_LIST_HEAD(&bn->dev_list);
4885
4886         bond_create_proc_dir(bn);
4887         bond_create_sysfs(bn);
4888
4889         return 0;
4890 }
4891
4892 static void __net_exit bond_net_exit(struct net *net)
4893 {
4894         struct bond_net *bn = net_generic(net, bond_net_id);
4895
4896         bond_destroy_sysfs(bn);
4897         bond_destroy_proc_dir(bn);
4898 }
4899
4900 static struct pernet_operations bond_net_ops = {
4901         .init = bond_net_init,
4902         .exit = bond_net_exit,
4903         .id   = &bond_net_id,
4904         .size = sizeof(struct bond_net),
4905 };
4906
4907 static int __init bonding_init(void)
4908 {
4909         int i;
4910         int res;
4911
4912         pr_info("%s", bond_version);
4913
4914         res = bond_check_params(&bonding_defaults);
4915         if (res)
4916                 goto out;
4917
4918         res = register_pernet_subsys(&bond_net_ops);
4919         if (res)
4920                 goto out;
4921
4922         res = rtnl_link_register(&bond_link_ops);
4923         if (res)
4924                 goto err_link;
4925
4926         bond_create_debugfs();
4927
4928         for (i = 0; i < max_bonds; i++) {
4929                 res = bond_create(&init_net, NULL);
4930                 if (res)
4931                         goto err;
4932         }
4933
4934         register_netdevice_notifier(&bond_netdev_notifier);
4935 out:
4936         return res;
4937 err:
4938         rtnl_link_unregister(&bond_link_ops);
4939 err_link:
4940         unregister_pernet_subsys(&bond_net_ops);
4941         goto out;
4942
4943 }
4944
4945 static void __exit bonding_exit(void)
4946 {
4947         unregister_netdevice_notifier(&bond_netdev_notifier);
4948
4949         bond_destroy_debugfs();
4950
4951         rtnl_link_unregister(&bond_link_ops);
4952         unregister_pernet_subsys(&bond_net_ops);
4953
4954 #ifdef CONFIG_NET_POLL_CONTROLLER
4955         /*
4956          * Make sure we don't have an imbalance on our netpoll blocking
4957          */
4958         WARN_ON(atomic_read(&netpoll_block_tx));
4959 #endif
4960 }
4961
4962 module_init(bonding_init);
4963 module_exit(bonding_exit);
4964 MODULE_LICENSE("GPL");
4965 MODULE_VERSION(DRV_VERSION);
4966 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4967 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4968 MODULE_ALIAS_RTNL_LINK("bond");