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 <net/pkt_sched.h>
  80 #include "bonding.h"
  81 #include "bond_3ad.h"
  82 #include "bond_alb.h"
  83
  84 /*---------------------------- Module parameters ----------------------------*/
  85
  86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  87 #define BOND_LINK_MON_INTERV    0
  88 #define BOND_LINK_ARP_INTERV    0
  89
  90 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  91 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  92 static int num_peer_notif = 1;
  93 static int miimon       = BOND_LINK_MON_INTERV;
  94 static int updelay;
  95 static int downdelay;
  96 static int use_carrier  = 1;
  97 static char *mode;
  98 static char *primary;
  99 static char *primary_reselect;
 100 static char *lacp_rate;
 101 static int min_links;
 102 static char *ad_select;
 103 static char *xmit_hash_policy;
 104 static int arp_interval = BOND_LINK_ARP_INTERV;
 105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 106 static char *arp_validate;
 107 static char *fail_over_mac;
 108 static int all_slaves_active = 0;
 109 static struct bond_params bonding_defaults;
 110 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 111
 112 module_param(max_bonds, int, 0);
 113 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 114 module_param(tx_queues, int, 0);
 115 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 116 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 117 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 118                                "failover event (alias of num_unsol_na)");
 119 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 120 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 121                                "failover event (alias of num_grat_arp)");
 122 module_param(miimon, int, 0);
 123 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 124 module_param(updelay, int, 0);
 125 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 126 module_param(downdelay, int, 0);
 127 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 128                             "in milliseconds");
 129 module_param(use_carrier, int, 0);
 130 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 131                               "0 for off, 1 for on (default)");
 132 module_param(mode, charp, 0);
 133 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 134                        "1 for active-backup, 2 for balance-xor, "
 135                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 136                        "6 for balance-alb");
 137 module_param(primary, charp, 0);
 138 MODULE_PARM_DESC(primary, "Primary network device to use");
 139 module_param(primary_reselect, charp, 0);
 140 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 141                                    "once it comes up; "
 142                                    "0 for always (default), "
 143                                    "1 for only if speed of primary is "
 144                                    "better, "
 145                                    "2 for only on active slave "
 146                                    "failure");
 147 module_param(lacp_rate, charp, 0);
 148 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 149                             "0 for slow, 1 for fast");
 150 module_param(ad_select, charp, 0);
 151 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 152                             "0 for stable (default), 1 for bandwidth, "
 153                             "2 for count");
 154 module_param(min_links, int, 0);
 155 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 156
 157 module_param(xmit_hash_policy, charp, 0);
 158 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 159                                    "0 for layer 2 (default), 1 for layer 3+4, "
 160                                    "2 for layer 2+3");
 161 module_param(arp_interval, int, 0);
 162 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 163 module_param_array(arp_ip_target, charp, NULL, 0);
 164 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 165 module_param(arp_validate, charp, 0);
 166 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 167                                "0 for none (default), 1 for active, "
 168                                "2 for backup, 3 for all");
 169 module_param(fail_over_mac, charp, 0);
 170 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 171                                 "the same MAC; 0 for none (default), "
 172                                 "1 for active, 2 for follow");
 173 module_param(all_slaves_active, int, 0);
 174 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 175                                      "by setting active flag for all slaves; "
 176                                      "0 for never (default), 1 for always.");
 177 module_param(resend_igmp, int, 0);
 178 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 179                               "link failure");
 180
 181 /*----------------------------- Global variables ----------------------------*/
 182
 183 #ifdef CONFIG_NET_POLL_CONTROLLER
 184 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 185 #endif
 186
 187 int bond_net_id __read_mostly;
 188
 189 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 190 static int arp_ip_count;
 191 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 192 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 193 static int lacp_fast;
 194
 195 const struct bond_parm_tbl bond_lacp_tbl[] = {
 196 {       "slow",         AD_LACP_SLOW},
 197 {       "fast",         AD_LACP_FAST},
 198 {       NULL,           -1},
 199 };
 200
 201 const struct bond_parm_tbl bond_mode_tbl[] = {
 202 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 203 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 204 {       "balance-xor",          BOND_MODE_XOR},
 205 {       "broadcast",            BOND_MODE_BROADCAST},
 206 {       "802.3ad",              BOND_MODE_8023AD},
 207 {       "balance-tlb",          BOND_MODE_TLB},
 208 {       "balance-alb",          BOND_MODE_ALB},
 209 {       NULL,                   -1},
 210 };
 211
 212 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 213 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 214 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 215 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 216 {       NULL,                   -1},
 217 };
 218
 219 const struct bond_parm_tbl arp_validate_tbl[] = {
 220 {       "none",                 BOND_ARP_VALIDATE_NONE},
 221 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 222 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 223 {       "all",                  BOND_ARP_VALIDATE_ALL},
 224 {       NULL,                   -1},
 225 };
 226
 227 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 228 {       "none",                 BOND_FOM_NONE},
 229 {       "active",               BOND_FOM_ACTIVE},
 230 {       "follow",               BOND_FOM_FOLLOW},
 231 {       NULL,                   -1},
 232 };
 233
 234 const struct bond_parm_tbl pri_reselect_tbl[] = {
 235 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 236 {       "better",               BOND_PRI_RESELECT_BETTER},
 237 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 238 {       NULL,                   -1},
 239 };
 240
 241 struct bond_parm_tbl ad_select_tbl[] = {
 242 {       "stable",       BOND_AD_STABLE},
 243 {       "bandwidth",    BOND_AD_BANDWIDTH},
 244 {       "count",        BOND_AD_COUNT},
 245 {       NULL,           -1},
 246 };
 247
 248 /*-------------------------- Forward declarations ---------------------------*/
 249
 250 static int bond_init(struct net_device *bond_dev);
 251 static void bond_uninit(struct net_device *bond_dev);
 252
 253 /*---------------------------- General routines -----------------------------*/
 254
 255 const char *bond_mode_name(int mode)
 256 {
 257         static const char *names[] = {
 258                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 259                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 260                 [BOND_MODE_XOR] = "load balancing (xor)",
 261                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 262                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 263                 [BOND_MODE_TLB] = "transmit load balancing",
 264                 [BOND_MODE_ALB] = "adaptive load balancing",
 265         };
 266
 267         if (mode < 0 || mode > BOND_MODE_ALB)
 268                 return "unknown";
 269
 270         return names[mode];
 271 }
 272
 273 /*---------------------------------- VLAN -----------------------------------*/
 274
 275 /**
 276  * bond_add_vlan - add a new vlan id on bond
 277  * @bond: bond that got the notification
 278  * @vlan_id: the vlan id to add
 279  *
 280  * Returns -ENOMEM if allocation failed.
 281  */
 282 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 283 {
 284         struct vlan_entry *vlan;
 285
 286         pr_debug("bond: %s, vlan id %d\n",
 287                  (bond ? bond->dev->name : "None"), vlan_id);
 288
 289         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 290         if (!vlan)
 291                 return -ENOMEM;
 292
 293         INIT_LIST_HEAD(&vlan->vlan_list);
 294         vlan->vlan_id = vlan_id;
 295
 296         write_lock_bh(&bond->lock);
 297
 298         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 299
 300         write_unlock_bh(&bond->lock);
 301
 302         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 303
 304         return 0;
 305 }
 306
 307 /**
 308  * bond_del_vlan - delete a vlan id from bond
 309  * @bond: bond that got the notification
 310  * @vlan_id: the vlan id to delete
 311  *
 312  * returns -ENODEV if @vlan_id was not found in @bond.
 313  */
 314 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 315 {
 316         struct vlan_entry *vlan;
 317         int res = -ENODEV;
 318
 319         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 320
 321         block_netpoll_tx();
 322         write_lock_bh(&bond->lock);
 323
 324         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 325                 if (vlan->vlan_id == vlan_id) {
 326                         list_del(&vlan->vlan_list);
 327
 328                         if (bond_is_lb(bond))
 329                                 bond_alb_clear_vlan(bond, vlan_id);
 330
 331                         pr_debug("removed VLAN ID %d from bond %s\n",
 332                                  vlan_id, bond->dev->name);
 333
 334                         kfree(vlan);
 335
 336                         res = 0;
 337                         goto out;
 338                 }
 339         }
 340
 341         pr_debug("couldn't find VLAN ID %d in bond %s\n",
 342                  vlan_id, bond->dev->name);
 343
 344 out:
 345         write_unlock_bh(&bond->lock);
 346         unblock_netpoll_tx();
 347         return res;
 348 }
 349
 350 /**
 351  * bond_next_vlan - safely skip to the next item in the vlans list.
 352  * @bond: the bond we're working on
 353  * @curr: item we're advancing from
 354  *
 355  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 356  * or @curr->next otherwise (even if it is @curr itself again).
 357  *
 358  * Caller must hold bond->lock
 359  */
 360 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 361 {
 362         struct vlan_entry *next, *last;
 363
 364         if (list_empty(&bond->vlan_list))
 365                 return NULL;
 366
 367         if (!curr) {
 368                 next = list_entry(bond->vlan_list.next,
 369                                   struct vlan_entry, vlan_list);
 370         } else {
 371                 last = list_entry(bond->vlan_list.prev,
 372                                   struct vlan_entry, vlan_list);
 373                 if (last == curr) {
 374                         next = list_entry(bond->vlan_list.next,
 375                                           struct vlan_entry, vlan_list);
 376                 } else {
 377                         next = list_entry(curr->vlan_list.next,
 378                                           struct vlan_entry, vlan_list);
 379                 }
 380         }
 381
 382         return next;
 383 }
 384
 385 /**
 386  * bond_dev_queue_xmit - Prepare skb for xmit.
 387  *
 388  * @bond: bond device that got this skb for tx.
 389  * @skb: hw accel VLAN tagged skb to transmit
 390  * @slave_dev: slave that is supposed to xmit this skbuff
 391  */
 392 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 393                         struct net_device *slave_dev)
 394 {
 395         skb->dev = slave_dev;
 396
 397         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 398                      sizeof(qdisc_skb_cb(skb)->bond_queue_mapping));
 399         skb->queue_mapping = qdisc_skb_cb(skb)->bond_queue_mapping;
 400
 401         if (unlikely(netpoll_tx_running(slave_dev)))
 402                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 403         else
 404                 dev_queue_xmit(skb);
 405
 406         return 0;
 407 }
 408
 409 /*
 410  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 411  * We don't protect the slave list iteration with a lock because:
 412  * a. This operation is performed in IOCTL context,
 413  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 414  * c. Holding a lock with BH disabled while directly calling a base driver
 415  *    entry point is generally a BAD idea.
 416  *
 417  * The design of synchronization/protection for this operation in the 8021q
 418  * module is good for one or more VLAN devices over a single physical device
 419  * and cannot be extended for a teaming solution like bonding, so there is a
 420  * potential race condition here where a net device from the vlan group might
 421  * be referenced (either by a base driver or the 8021q code) while it is being
 422  * removed from the system. However, it turns out we're not making matters
 423  * worse, and if it works for regular VLAN usage it will work here too.
 424 */
 425
 426 /**
 427  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 428  * @bond_dev: bonding net device that got called
 429  * @vid: vlan id being added
 430  */
 431 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 432 {
 433         struct bonding *bond = netdev_priv(bond_dev);
 434         struct slave *slave, *stop_at;
 435         int i, res;
 436
 437         bond_for_each_slave(bond, slave, i) {
 438                 res = vlan_vid_add(slave->dev, vid);
 439                 if (res)
 440                         goto unwind;
 441         }
 442
 443         res = bond_add_vlan(bond, vid);
 444         if (res) {
 445                 pr_err("%s: Error: Failed to add vlan id %d\n",
 446                        bond_dev->name, vid);
 447                 return res;
 448         }
 449
 450         return 0;
 451
 452 unwind:
 453         /* unwind from head to the slave that failed */
 454         stop_at = slave;
 455         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at)
 456                 vlan_vid_del(slave->dev, vid);
 457
 458         return res;
 459 }
 460
 461 /**
 462  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 463  * @bond_dev: bonding net device that got called
 464  * @vid: vlan id being removed
 465  */
 466 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 467 {
 468         struct bonding *bond = netdev_priv(bond_dev);
 469         struct slave *slave;
 470         int i, res;
 471
 472         bond_for_each_slave(bond, slave, i)
 473                 vlan_vid_del(slave->dev, vid);
 474
 475         res = bond_del_vlan(bond, vid);
 476         if (res) {
 477                 pr_err("%s: Error: Failed to remove vlan id %d\n",
 478                        bond_dev->name, vid);
 479                 return res;
 480         }
 481
 482         return 0;
 483 }
 484
 485 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 486 {
 487         struct vlan_entry *vlan;
 488         int res;
 489
 490         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 491                 res = vlan_vid_add(slave_dev, vlan->vlan_id);
 492                 if (res)
 493                         pr_warning("%s: Failed to add vlan id %d to device %s\n",
 494                                    bond->dev->name, vlan->vlan_id,
 495                                    slave_dev->name);
 496         }
 497 }
 498
 499 static void bond_del_vlans_from_slave(struct bonding *bond,
 500                                       struct net_device *slave_dev)
 501 {
 502         struct vlan_entry *vlan;
 503
 504         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 505                 if (!vlan->vlan_id)
 506                         continue;
 507                 vlan_vid_del(slave_dev, vlan->vlan_id);
 508         }
 509 }
 510
 511 /*------------------------------- Link status -------------------------------*/
 512
 513 /*
 514  * Set the carrier state for the master according to the state of its
 515  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 516  * do special 802.3ad magic.
 517  *
 518  * Returns zero if carrier state does not change, nonzero if it does.
 519  */
 520 static int bond_set_carrier(struct bonding *bond)
 521 {
 522         struct slave *slave;
 523         int i;
 524
 525         if (bond->slave_cnt == 0)
 526                 goto down;
 527
 528         if (bond->params.mode == BOND_MODE_8023AD)
 529                 return bond_3ad_set_carrier(bond);
 530
 531         bond_for_each_slave(bond, slave, i) {
 532                 if (slave->link == BOND_LINK_UP) {
 533                         if (!netif_carrier_ok(bond->dev)) {
 534                                 netif_carrier_on(bond->dev);
 535                                 return 1;
 536                         }
 537                         return 0;
 538                 }
 539         }
 540
 541 down:
 542         if (netif_carrier_ok(bond->dev)) {
 543                 netif_carrier_off(bond->dev);
 544                 return 1;
 545         }
 546         return 0;
 547 }
 548
 549 /*
 550  * Get link speed and duplex from the slave's base driver
 551  * using ethtool. If for some reason the call fails or the
 552  * values are invalid, set speed and duplex to -1,
 553  * and return.
 554  */
 555 static void bond_update_speed_duplex(struct slave *slave)
 556 {
 557         struct net_device *slave_dev = slave->dev;
 558         struct ethtool_cmd ecmd;
 559         u32 slave_speed;
 560         int res;
 561
 562         slave->speed = SPEED_UNKNOWN;
 563         slave->duplex = DUPLEX_UNKNOWN;
 564
 565         res = __ethtool_get_settings(slave_dev, &ecmd);
 566         if (res < 0)
 567                 return;
 568
 569         slave_speed = ethtool_cmd_speed(&ecmd);
 570         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 571                 return;
 572
 573         switch (ecmd.duplex) {
 574         case DUPLEX_FULL:
 575         case DUPLEX_HALF:
 576                 break;
 577         default:
 578                 return;
 579         }
 580
 581         slave->speed = slave_speed;
 582         slave->duplex = ecmd.duplex;
 583
 584         return;
 585 }
 586
 587 /*
 588  * if <dev> supports MII link status reporting, check its link status.
 589  *
 590  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 591  * depending upon the setting of the use_carrier parameter.
 592  *
 593  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 594  * can't tell and just pretend it is), or 0, meaning that the link is
 595  * down.
 596  *
 597  * If reporting is non-zero, instead of faking link up, return -1 if
 598  * both ETHTOOL and MII ioctls fail (meaning the device does not
 599  * support them).  If use_carrier is set, return whatever it says.
 600  * It'd be nice if there was a good way to tell if a driver supports
 601  * netif_carrier, but there really isn't.
 602  */
 603 static int bond_check_dev_link(struct bonding *bond,
 604                                struct net_device *slave_dev, int reporting)
 605 {
 606         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 607         int (*ioctl)(struct net_device *, struct ifreq *, int);
 608         struct ifreq ifr;
 609         struct mii_ioctl_data *mii;
 610
 611         if (!reporting && !netif_running(slave_dev))
 612                 return 0;
 613
 614         if (bond->params.use_carrier)
 615                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 616
 617         /* Try to get link status using Ethtool first. */
 618         if (slave_dev->ethtool_ops) {
 619                 if (slave_dev->ethtool_ops->get_link) {
 620                         u32 link;
 621
 622                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 623
 624                         return link ? BMSR_LSTATUS : 0;
 625                 }
 626         }
 627
 628         /* Ethtool can't be used, fallback to MII ioctls. */
 629         ioctl = slave_ops->ndo_do_ioctl;
 630         if (ioctl) {
 631                 /* TODO: set pointer to correct ioctl on a per team member */
 632                 /*       bases to make this more efficient. that is, once  */
 633                 /*       we determine the correct ioctl, we will always    */
 634                 /*       call it and not the others for that team          */
 635                 /*       member.                                           */
 636
 637                 /*
 638                  * We cannot assume that SIOCGMIIPHY will also read a
 639                  * register; not all network drivers (e.g., e100)
 640                  * support that.
 641                  */
 642
 643                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 644                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 645                 mii = if_mii(&ifr);
 646                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 647                         mii->reg_num = MII_BMSR;
 648                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 649                                 return mii->val_out & BMSR_LSTATUS;
 650                 }
 651         }
 652
 653         /*
 654          * If reporting, report that either there's no dev->do_ioctl,
 655          * or both SIOCGMIIREG and get_link failed (meaning that we
 656          * cannot report link status).  If not reporting, pretend
 657          * we're ok.
 658          */
 659         return reporting ? -1 : BMSR_LSTATUS;
 660 }
 661
 662 /*----------------------------- Multicast list ------------------------------*/
 663
 664 /*
 665  * Push the promiscuity flag down to appropriate slaves
 666  */
 667 static int bond_set_promiscuity(struct bonding *bond, int inc)
 668 {
 669         int err = 0;
 670         if (USES_PRIMARY(bond->params.mode)) {
 671                 /* write lock already acquired */
 672                 if (bond->curr_active_slave) {
 673                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 674                                                   inc);
 675                 }
 676         } else {
 677                 struct slave *slave;
 678                 int i;
 679                 bond_for_each_slave(bond, slave, i) {
 680                         err = dev_set_promiscuity(slave->dev, inc);
 681                         if (err)
 682                                 return err;
 683                 }
 684         }
 685         return err;
 686 }
 687
 688 /*
 689  * Push the allmulti flag down to all slaves
 690  */
 691 static int bond_set_allmulti(struct bonding *bond, int inc)
 692 {
 693         int err = 0;
 694         if (USES_PRIMARY(bond->params.mode)) {
 695                 /* write lock already acquired */
 696                 if (bond->curr_active_slave) {
 697                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 698                                                inc);
 699                 }
 700         } else {
 701                 struct slave *slave;
 702                 int i;
 703                 bond_for_each_slave(bond, slave, i) {
 704                         err = dev_set_allmulti(slave->dev, inc);
 705                         if (err)
 706                                 return err;
 707                 }
 708         }
 709         return err;
 710 }
 711
 712 /*
 713  * Add a Multicast address to slaves
 714  * according to mode
 715  */
 716 static void bond_mc_add(struct bonding *bond, void *addr)
 717 {
 718         if (USES_PRIMARY(bond->params.mode)) {
 719                 /* write lock already acquired */
 720                 if (bond->curr_active_slave)
 721                         dev_mc_add(bond->curr_active_slave->dev, addr);
 722         } else {
 723                 struct slave *slave;
 724                 int i;
 725
 726                 bond_for_each_slave(bond, slave, i)
 727                         dev_mc_add(slave->dev, addr);
 728         }
 729 }
 730
 731 /*
 732  * Remove a multicast address from slave
 733  * according to mode
 734  */
 735 static void bond_mc_del(struct bonding *bond, void *addr)
 736 {
 737         if (USES_PRIMARY(bond->params.mode)) {
 738                 /* write lock already acquired */
 739                 if (bond->curr_active_slave)
 740                         dev_mc_del(bond->curr_active_slave->dev, addr);
 741         } else {
 742                 struct slave *slave;
 743                 int i;
 744                 bond_for_each_slave(bond, slave, i) {
 745                         dev_mc_del(slave->dev, addr);
 746                 }
 747         }
 748 }
 749
 750
 751 static void __bond_resend_igmp_join_requests(struct net_device *dev)
 752 {
 753         struct in_device *in_dev;
 754
 755         rcu_read_lock();
 756         in_dev = __in_dev_get_rcu(dev);
 757         if (in_dev)
 758                 ip_mc_rejoin_groups(in_dev);
 759         rcu_read_unlock();
 760 }
 761
 762 /*
 763  * Retrieve the list of registered multicast addresses for the bonding
 764  * device and retransmit an IGMP JOIN request to the current active
 765  * slave.
 766  */
 767 static void bond_resend_igmp_join_requests(struct bonding *bond)
 768 {
 769         struct net_device *bond_dev, *vlan_dev, *master_dev;
 770         struct vlan_entry *vlan;
 771
 772         read_lock(&bond->lock);
 773
 774         bond_dev = bond->dev;
 775
 776         /* rejoin all groups on bond device */
 777         __bond_resend_igmp_join_requests(bond_dev);
 778
 779         /*
 780          * if bond is enslaved to a bridge,
 781          * then rejoin all groups on its master
 782          */
 783         master_dev = bond_dev->master;
 784         if (master_dev)
 785                 if ((master_dev->priv_flags & IFF_EBRIDGE)
 786                         && (bond_dev->priv_flags & IFF_BRIDGE_PORT))
 787                         __bond_resend_igmp_join_requests(master_dev);
 788
 789         /* rejoin all groups on vlan devices */
 790         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 791                 rcu_read_lock();
 792                 vlan_dev = __vlan_find_dev_deep(bond_dev,
 793                                                 vlan->vlan_id);
 794                 rcu_read_unlock();
 795                 if (vlan_dev)
 796                         __bond_resend_igmp_join_requests(vlan_dev);
 797         }
 798
 799         if (--bond->igmp_retrans > 0)
 800                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 801
 802         read_unlock(&bond->lock);
 803 }
 804
 805 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 806 {
 807         struct bonding *bond = container_of(work, struct bonding,
 808                                             mcast_work.work);
 809         bond_resend_igmp_join_requests(bond);
 810 }
 811
 812 /*
 813  * flush all members of flush->mc_list from device dev->mc_list
 814  */
 815 static void bond_mc_list_flush(struct net_device *bond_dev,
 816                                struct net_device *slave_dev)
 817 {
 818         struct bonding *bond = netdev_priv(bond_dev);
 819         struct netdev_hw_addr *ha;
 820
 821         netdev_for_each_mc_addr(ha, bond_dev)
 822                 dev_mc_del(slave_dev, ha->addr);
 823
 824         if (bond->params.mode == BOND_MODE_8023AD) {
 825                 /* del lacpdu mc addr from mc list */
 826                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 827
 828                 dev_mc_del(slave_dev, lacpdu_multicast);
 829         }
 830 }
 831
 832 /*--------------------------- Active slave change ---------------------------*/
 833
 834 /*
 835  * Update the mc list and multicast-related flags for the new and
 836  * old active slaves (if any) according to the multicast mode, and
 837  * promiscuous flags unconditionally.
 838  */
 839 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
 840                          struct slave *old_active)
 841 {
 842         struct netdev_hw_addr *ha;
 843
 844         if (!USES_PRIMARY(bond->params.mode))
 845                 /* nothing to do -  mc list is already up-to-date on
 846                  * all slaves
 847                  */
 848                 return;
 849
 850         if (old_active) {
 851                 if (bond->dev->flags & IFF_PROMISC)
 852                         dev_set_promiscuity(old_active->dev, -1);
 853
 854                 if (bond->dev->flags & IFF_ALLMULTI)
 855                         dev_set_allmulti(old_active->dev, -1);
 856
 857                 netdev_for_each_mc_addr(ha, bond->dev)
 858                         dev_mc_del(old_active->dev, ha->addr);
 859         }
 860
 861         if (new_active) {
 862                 /* FIXME: Signal errors upstream. */
 863                 if (bond->dev->flags & IFF_PROMISC)
 864                         dev_set_promiscuity(new_active->dev, 1);
 865
 866                 if (bond->dev->flags & IFF_ALLMULTI)
 867                         dev_set_allmulti(new_active->dev, 1);
 868
 869                 netdev_for_each_mc_addr(ha, bond->dev)
 870                         dev_mc_add(new_active->dev, ha->addr);
 871         }
 872 }
 873
 874 /*
 875  * bond_do_fail_over_mac
 876  *
 877  * Perform special MAC address swapping for fail_over_mac settings
 878  *
 879  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 880  */
 881 static void bond_do_fail_over_mac(struct bonding *bond,
 882                                   struct slave *new_active,
 883                                   struct slave *old_active)
 884         __releases(&bond->curr_slave_lock)
 885         __releases(&bond->lock)
 886         __acquires(&bond->lock)
 887         __acquires(&bond->curr_slave_lock)
 888 {
 889         u8 tmp_mac[ETH_ALEN];
 890         struct sockaddr saddr;
 891         int rv;
 892
 893         switch (bond->params.fail_over_mac) {
 894         case BOND_FOM_ACTIVE:
 895                 if (new_active) {
 896                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
 897                                new_active->dev->addr_len);
 898                         write_unlock_bh(&bond->curr_slave_lock);
 899                         read_unlock(&bond->lock);
 900                         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
 901                         read_lock(&bond->lock);
 902                         write_lock_bh(&bond->curr_slave_lock);
 903                 }
 904                 break;
 905         case BOND_FOM_FOLLOW:
 906                 /*
 907                  * if new_active && old_active, swap them
 908                  * if just old_active, do nothing (going to no active slave)
 909                  * if just new_active, set new_active to bond's MAC
 910                  */
 911                 if (!new_active)
 912                         return;
 913
 914                 write_unlock_bh(&bond->curr_slave_lock);
 915                 read_unlock(&bond->lock);
 916
 917                 if (old_active) {
 918                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 919                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 920                                ETH_ALEN);
 921                         saddr.sa_family = new_active->dev->type;
 922                 } else {
 923                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 924                         saddr.sa_family = bond->dev->type;
 925                 }
 926
 927                 rv = dev_set_mac_address(new_active->dev, &saddr);
 928                 if (rv) {
 929                         pr_err("%s: Error %d setting MAC of slave %s\n",
 930                                bond->dev->name, -rv, new_active->dev->name);
 931                         goto out;
 932                 }
 933
 934                 if (!old_active)
 935                         goto out;
 936
 937                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
 938                 saddr.sa_family = old_active->dev->type;
 939
 940                 rv = dev_set_mac_address(old_active->dev, &saddr);
 941                 if (rv)
 942                         pr_err("%s: Error %d setting MAC of slave %s\n",
 943                                bond->dev->name, -rv, new_active->dev->name);
 944 out:
 945                 read_lock(&bond->lock);
 946                 write_lock_bh(&bond->curr_slave_lock);
 947                 break;
 948         default:
 949                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
 950                        bond->dev->name, bond->params.fail_over_mac);
 951                 break;
 952         }
 953
 954 }
 955
 956 static bool bond_should_change_active(struct bonding *bond)
 957 {
 958         struct slave *prim = bond->primary_slave;
 959         struct slave *curr = bond->curr_active_slave;
 960
 961         if (!prim || !curr || curr->link != BOND_LINK_UP)
 962                 return true;
 963         if (bond->force_primary) {
 964                 bond->force_primary = false;
 965                 return true;
 966         }
 967         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 968             (prim->speed < curr->speed ||
 969              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 970                 return false;
 971         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 972                 return false;
 973         return true;
 974 }
 975
 976 /**
 977  * find_best_interface - select the best available slave to be the active one
 978  * @bond: our bonding struct
 979  *
 980  * Warning: Caller must hold curr_slave_lock for writing.
 981  */
 982 static struct slave *bond_find_best_slave(struct bonding *bond)
 983 {
 984         struct slave *new_active, *old_active;
 985         struct slave *bestslave = NULL;
 986         int mintime = bond->params.updelay;
 987         int i;
 988
 989         new_active = bond->curr_active_slave;
 990
 991         if (!new_active) { /* there were no active slaves left */
 992                 if (bond->slave_cnt > 0)   /* found one slave */
 993                         new_active = bond->first_slave;
 994                 else
 995                         return NULL; /* still no slave, return NULL */
 996         }
 997
 998         if ((bond->primary_slave) &&
 999             bond->primary_slave->link == BOND_LINK_UP &&
1000             bond_should_change_active(bond)) {
1001                 new_active = bond->primary_slave;
1002         }
1003
1004         /* remember where to stop iterating over the slaves */
1005         old_active = new_active;
1006
1007         bond_for_each_slave_from(bond, new_active, i, old_active) {
1008                 if (new_active->link == BOND_LINK_UP) {
1009                         return new_active;
1010                 } else if (new_active->link == BOND_LINK_BACK &&
1011                            IS_UP(new_active->dev)) {
1012                         /* link up, but waiting for stabilization */
1013                         if (new_active->delay < mintime) {
1014                                 mintime = new_active->delay;
1015                                 bestslave = new_active;
1016                         }
1017                 }
1018         }
1019
1020         return bestslave;
1021 }
1022
1023 static bool bond_should_notify_peers(struct bonding *bond)
1024 {
1025         struct slave *slave = bond->curr_active_slave;
1026
1027         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1028                  bond->dev->name, slave ? slave->dev->name : "NULL");
1029
1030         if (!slave || !bond->send_peer_notif ||
1031             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1032                 return false;
1033
1034         bond->send_peer_notif--;
1035         return true;
1036 }
1037
1038 /**
1039  * change_active_interface - change the active slave into the specified one
1040  * @bond: our bonding struct
1041  * @new: the new slave to make the active one
1042  *
1043  * Set the new slave to the bond's settings and unset them on the old
1044  * curr_active_slave.
1045  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1046  *
1047  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1048  * because it is apparently the best available slave we have, even though its
1049  * updelay hasn't timed out yet.
1050  *
1051  * If new_active is not NULL, caller must hold bond->lock for read and
1052  * curr_slave_lock for write_bh.
1053  */
1054 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1055 {
1056         struct slave *old_active = bond->curr_active_slave;
1057
1058         if (old_active == new_active)
1059                 return;
1060
1061         if (new_active) {
1062                 new_active->jiffies = jiffies;
1063
1064                 if (new_active->link == BOND_LINK_BACK) {
1065                         if (USES_PRIMARY(bond->params.mode)) {
1066                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1067                                         bond->dev->name, new_active->dev->name,
1068                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1069                         }
1070
1071                         new_active->delay = 0;
1072                         new_active->link = BOND_LINK_UP;
1073
1074                         if (bond->params.mode == BOND_MODE_8023AD)
1075                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1076
1077                         if (bond_is_lb(bond))
1078                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1079                 } else {
1080                         if (USES_PRIMARY(bond->params.mode)) {
1081                                 pr_info("%s: making interface %s the new active one.\n",
1082                                         bond->dev->name, new_active->dev->name);
1083                         }
1084                 }
1085         }
1086
1087         if (USES_PRIMARY(bond->params.mode))
1088                 bond_mc_swap(bond, new_active, old_active);
1089
1090         if (bond_is_lb(bond)) {
1091                 bond_alb_handle_active_change(bond, new_active);
1092                 if (old_active)
1093                         bond_set_slave_inactive_flags(old_active);
1094                 if (new_active)
1095                         bond_set_slave_active_flags(new_active);
1096         } else {
1097                 bond->curr_active_slave = new_active;
1098         }
1099
1100         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1101                 if (old_active)
1102                         bond_set_slave_inactive_flags(old_active);
1103
1104                 if (new_active) {
1105                         bool should_notify_peers = false;
1106
1107                         bond_set_slave_active_flags(new_active);
1108
1109                         if (bond->params.fail_over_mac)
1110                                 bond_do_fail_over_mac(bond, new_active,
1111                                                       old_active);
1112
1113                         if (netif_running(bond->dev)) {
1114                                 bond->send_peer_notif =
1115                                         bond->params.num_peer_notif;
1116                                 should_notify_peers =
1117                                         bond_should_notify_peers(bond);
1118                         }
1119
1120                         write_unlock_bh(&bond->curr_slave_lock);
1121                         read_unlock(&bond->lock);
1122
1123                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1124                         if (should_notify_peers)
1125                                 netdev_bonding_change(bond->dev,
1126                                                       NETDEV_NOTIFY_PEERS);
1127
1128                         read_lock(&bond->lock);
1129                         write_lock_bh(&bond->curr_slave_lock);
1130                 }
1131         }
1132
1133         /* resend IGMP joins since active slave has changed or
1134          * all were sent on curr_active_slave.
1135          * resend only if bond is brought up with the affected
1136          * bonding modes and the retransmission is enabled */
1137         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1138             ((USES_PRIMARY(bond->params.mode) && new_active) ||
1139              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1140                 bond->igmp_retrans = bond->params.resend_igmp;
1141                 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1142         }
1143 }
1144
1145 /**
1146  * bond_select_active_slave - select a new active slave, if needed
1147  * @bond: our bonding struct
1148  *
1149  * This functions should be called when one of the following occurs:
1150  * - The old curr_active_slave has been released or lost its link.
1151  * - The primary_slave has got its link back.
1152  * - A slave has got its link back and there's no old curr_active_slave.
1153  *
1154  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1155  */
1156 void bond_select_active_slave(struct bonding *bond)
1157 {
1158         struct slave *best_slave;
1159         int rv;
1160
1161         best_slave = bond_find_best_slave(bond);
1162         if (best_slave != bond->curr_active_slave) {
1163                 bond_change_active_slave(bond, best_slave);
1164                 rv = bond_set_carrier(bond);
1165                 if (!rv)
1166                         return;
1167
1168                 if (netif_carrier_ok(bond->dev)) {
1169                         pr_info("%s: first active interface up!\n",
1170                                 bond->dev->name);
1171                 } else {
1172                         pr_info("%s: now running without any active interface !\n",
1173                                 bond->dev->name);
1174                 }
1175         }
1176 }
1177
1178 /*--------------------------- slave list handling ---------------------------*/
1179
1180 /*
1181  * This function attaches the slave to the end of list.
1182  *
1183  * bond->lock held for writing by caller.
1184  */
1185 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1186 {
1187         if (bond->first_slave == NULL) { /* attaching the first slave */
1188                 new_slave->next = new_slave;
1189                 new_slave->prev = new_slave;
1190                 bond->first_slave = new_slave;
1191         } else {
1192                 new_slave->next = bond->first_slave;
1193                 new_slave->prev = bond->first_slave->prev;
1194                 new_slave->next->prev = new_slave;
1195                 new_slave->prev->next = new_slave;
1196         }
1197
1198         bond->slave_cnt++;
1199 }
1200
1201 /*
1202  * This function detaches the slave from the list.
1203  * WARNING: no check is made to verify if the slave effectively
1204  * belongs to <bond>.
1205  * Nothing is freed on return, structures are just unchained.
1206  * If any slave pointer in bond was pointing to <slave>,
1207  * it should be changed by the calling function.
1208  *
1209  * bond->lock held for writing by caller.
1210  */
1211 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1212 {
1213         if (slave->next)
1214                 slave->next->prev = slave->prev;
1215
1216         if (slave->prev)
1217                 slave->prev->next = slave->next;
1218
1219         if (bond->first_slave == slave) { /* slave is the first slave */
1220                 if (bond->slave_cnt > 1) { /* there are more slave */
1221                         bond->first_slave = slave->next;
1222                 } else {
1223                         bond->first_slave = NULL; /* slave was the last one */
1224                 }
1225         }
1226
1227         slave->next = NULL;
1228         slave->prev = NULL;
1229         bond->slave_cnt--;
1230 }
1231
1232 #ifdef CONFIG_NET_POLL_CONTROLLER
1233 static inline int slave_enable_netpoll(struct slave *slave)
1234 {
1235         struct netpoll *np;
1236         int err = 0;
1237
1238         np = kzalloc(sizeof(*np), GFP_KERNEL);
1239         err = -ENOMEM;
1240         if (!np)
1241                 goto out;
1242
1243         np->dev = slave->dev;
1244         strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ);
1245         err = __netpoll_setup(np);
1246         if (err) {
1247                 kfree(np);
1248                 goto out;
1249         }
1250         slave->np = np;
1251 out:
1252         return err;
1253 }
1254 static inline void slave_disable_netpoll(struct slave *slave)
1255 {
1256         struct netpoll *np = slave->np;
1257
1258         if (!np)
1259                 return;
1260
1261         slave->np = NULL;
1262         synchronize_rcu_bh();
1263         __netpoll_cleanup(np);
1264         kfree(np);
1265 }
1266 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1267 {
1268         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1269                 return false;
1270         if (!slave_dev->netdev_ops->ndo_poll_controller)
1271                 return false;
1272         return true;
1273 }
1274
1275 static void bond_poll_controller(struct net_device *bond_dev)
1276 {
1277 }
1278
1279 static void __bond_netpoll_cleanup(struct bonding *bond)
1280 {
1281         struct slave *slave;
1282         int i;
1283
1284         bond_for_each_slave(bond, slave, i)
1285                 if (IS_UP(slave->dev))
1286                         slave_disable_netpoll(slave);
1287 }
1288 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1289 {
1290         struct bonding *bond = netdev_priv(bond_dev);
1291
1292         read_lock(&bond->lock);
1293         __bond_netpoll_cleanup(bond);
1294         read_unlock(&bond->lock);
1295 }
1296
1297 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1298 {
1299         struct bonding *bond = netdev_priv(dev);
1300         struct slave *slave;
1301         int i, err = 0;
1302
1303         read_lock(&bond->lock);
1304         bond_for_each_slave(bond, slave, i) {
1305                 err = slave_enable_netpoll(slave);
1306                 if (err) {
1307                         __bond_netpoll_cleanup(bond);
1308                         break;
1309                 }
1310         }
1311         read_unlock(&bond->lock);
1312         return err;
1313 }
1314
1315 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1316 {
1317         return bond->dev->npinfo;
1318 }
1319
1320 #else
1321 static inline int slave_enable_netpoll(struct slave *slave)
1322 {
1323         return 0;
1324 }
1325 static inline void slave_disable_netpoll(struct slave *slave)
1326 {
1327 }
1328 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1329 {
1330 }
1331 #endif
1332
1333 /*---------------------------------- IOCTL ----------------------------------*/
1334
1335 static int bond_sethwaddr(struct net_device *bond_dev,
1336                           struct net_device *slave_dev)
1337 {
1338         pr_debug("bond_dev=%p\n", bond_dev);
1339         pr_debug("slave_dev=%p\n", slave_dev);
1340         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1341         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1342         return 0;
1343 }
1344
1345 static netdev_features_t bond_fix_features(struct net_device *dev,
1346         netdev_features_t features)
1347 {
1348         struct slave *slave;
1349         struct bonding *bond = netdev_priv(dev);
1350         netdev_features_t mask;
1351         int i;
1352
1353         read_lock(&bond->lock);
1354
1355         if (!bond->first_slave) {
1356                 /* Disable adding VLANs to empty bond. But why? --mq */
1357                 features |= NETIF_F_VLAN_CHALLENGED;
1358                 goto out;
1359         }
1360
1361         mask = features;
1362         features &= ~NETIF_F_ONE_FOR_ALL;
1363         features |= NETIF_F_ALL_FOR_ALL;
1364
1365         bond_for_each_slave(bond, slave, i) {
1366                 features = netdev_increment_features(features,
1367                                                      slave->dev->features,
1368                                                      mask);
1369         }
1370
1371 out:
1372         read_unlock(&bond->lock);
1373         return features;
1374 }
1375
1376 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1377                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1378                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1379
1380 static void bond_compute_features(struct bonding *bond)
1381 {
1382         struct slave *slave;
1383         struct net_device *bond_dev = bond->dev;
1384         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1385         unsigned short max_hard_header_len = ETH_HLEN;
1386         int i;
1387
1388         read_lock(&bond->lock);
1389
1390         if (!bond->first_slave)
1391                 goto done;
1392
1393         bond_for_each_slave(bond, slave, i) {
1394                 vlan_features = netdev_increment_features(vlan_features,
1395                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1396
1397                 if (slave->dev->hard_header_len > max_hard_header_len)
1398                         max_hard_header_len = slave->dev->hard_header_len;
1399         }
1400
1401 done:
1402         bond_dev->vlan_features = vlan_features;
1403         bond_dev->hard_header_len = max_hard_header_len;
1404
1405         read_unlock(&bond->lock);
1406
1407         netdev_change_features(bond_dev);
1408 }
1409
1410 static void bond_setup_by_slave(struct net_device *bond_dev,
1411                                 struct net_device *slave_dev)
1412 {
1413         struct bonding *bond = netdev_priv(bond_dev);
1414
1415         bond_dev->header_ops        = slave_dev->header_ops;
1416
1417         bond_dev->type              = slave_dev->type;
1418         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1419         bond_dev->addr_len          = slave_dev->addr_len;
1420
1421         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1422                 slave_dev->addr_len);
1423         bond->setup_by_slave = 1;
1424 }
1425
1426 /* On bonding slaves other than the currently active slave, suppress
1427  * duplicates except for alb non-mcast/bcast.
1428  */
1429 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1430                                             struct slave *slave,
1431                                             struct bonding *bond)
1432 {
1433         if (bond_is_slave_inactive(slave)) {
1434                 if (bond->params.mode == BOND_MODE_ALB &&
1435                     skb->pkt_type != PACKET_BROADCAST &&
1436                     skb->pkt_type != PACKET_MULTICAST)
1437                         return false;
1438                 return true;
1439         }
1440         return false;
1441 }
1442
1443 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1444 {
1445         struct sk_buff *skb = *pskb;
1446         struct slave *slave;
1447         struct bonding *bond;
1448         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1449                           struct slave *);
1450         int ret = RX_HANDLER_ANOTHER;
1451
1452         skb = skb_share_check(skb, GFP_ATOMIC);
1453         if (unlikely(!skb))
1454                 return RX_HANDLER_CONSUMED;
1455
1456         *pskb = skb;
1457
1458         slave = bond_slave_get_rcu(skb->dev);
1459         bond = slave->bond;
1460
1461         if (bond->params.arp_interval)
1462                 slave->dev->last_rx = jiffies;
1463
1464         recv_probe = ACCESS_ONCE(bond->recv_probe);
1465         if (recv_probe) {
1466                 ret = recv_probe(skb, bond, slave);
1467                 if (ret == RX_HANDLER_CONSUMED) {
1468                         consume_skb(skb);
1469                         return ret;
1470                 }
1471         }
1472
1473         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1474                 return RX_HANDLER_EXACT;
1475         }
1476
1477         skb->dev = bond->dev;
1478
1479         if (bond->params.mode == BOND_MODE_ALB &&
1480             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1481             skb->pkt_type == PACKET_HOST) {
1482
1483                 if (unlikely(skb_cow_head(skb,
1484                                           skb->data - skb_mac_header(skb)))) {
1485                         kfree_skb(skb);
1486                         return RX_HANDLER_CONSUMED;
1487                 }
1488                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1489         }
1490
1491         return ret;
1492 }
1493
1494 /* enslave device <slave> to bond device <master> */
1495 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1496 {
1497         struct bonding *bond = netdev_priv(bond_dev);
1498         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1499         struct slave *new_slave = NULL;
1500         struct netdev_hw_addr *ha;
1501         struct sockaddr addr;
1502         int link_reporting;
1503         int res = 0;
1504
1505         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1506                 slave_ops->ndo_do_ioctl == NULL) {
1507                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1508                            bond_dev->name, slave_dev->name);
1509         }
1510
1511         /* already enslaved */
1512         if (slave_dev->flags & IFF_SLAVE) {
1513                 pr_debug("Error, Device was already enslaved\n");
1514                 return -EBUSY;
1515         }
1516
1517         /* vlan challenged mutual exclusion */
1518         /* no need to lock since we're protected by rtnl_lock */
1519         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1520                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1521                 if (bond_vlan_used(bond)) {
1522                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1523                                bond_dev->name, slave_dev->name, bond_dev->name);
1524                         return -EPERM;
1525                 } else {
1526                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1527                                    bond_dev->name, slave_dev->name,
1528                                    slave_dev->name, bond_dev->name);
1529                 }
1530         } else {
1531                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1532         }
1533
1534         /*
1535          * Old ifenslave binaries are no longer supported.  These can
1536          * be identified with moderate accuracy by the state of the slave:
1537          * the current ifenslave will set the interface down prior to
1538          * enslaving it; the old ifenslave will not.
1539          */
1540         if ((slave_dev->flags & IFF_UP)) {
1541                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1542                        slave_dev->name);
1543                 res = -EPERM;
1544                 goto err_undo_flags;
1545         }
1546
1547         /* set bonding device ether type by slave - bonding netdevices are
1548          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1549          * there is a need to override some of the type dependent attribs/funcs.
1550          *
1551          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1552          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1553          */
1554         if (bond->slave_cnt == 0) {
1555                 if (bond_dev->type != slave_dev->type) {
1556                         pr_debug("%s: change device type from %d to %d\n",
1557                                  bond_dev->name,
1558                                  bond_dev->type, slave_dev->type);
1559
1560                         res = netdev_bonding_change(bond_dev,
1561                                                     NETDEV_PRE_TYPE_CHANGE);
1562                         res = notifier_to_errno(res);
1563                         if (res) {
1564                                 pr_err("%s: refused to change device type\n",
1565                                        bond_dev->name);
1566                                 res = -EBUSY;
1567                                 goto err_undo_flags;
1568                         }
1569
1570                         /* Flush unicast and multicast addresses */
1571                         dev_uc_flush(bond_dev);
1572                         dev_mc_flush(bond_dev);
1573
1574                         if (slave_dev->type != ARPHRD_ETHER)
1575                                 bond_setup_by_slave(bond_dev, slave_dev);
1576                         else {
1577                                 ether_setup(bond_dev);
1578                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1579                         }
1580
1581                         netdev_bonding_change(bond_dev,
1582                                               NETDEV_POST_TYPE_CHANGE);
1583                 }
1584         } else if (bond_dev->type != slave_dev->type) {
1585                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1586                        slave_dev->name,
1587                        slave_dev->type, bond_dev->type);
1588                 res = -EINVAL;
1589                 goto err_undo_flags;
1590         }
1591
1592         if (slave_ops->ndo_set_mac_address == NULL) {
1593                 if (bond->slave_cnt == 0) {
1594                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1595                                    bond_dev->name);
1596                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1597                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1598                         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",
1599                                bond_dev->name);
1600                         res = -EOPNOTSUPP;
1601                         goto err_undo_flags;
1602                 }
1603         }
1604
1605         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1606
1607         /* If this is the first slave, then we need to set the master's hardware
1608          * address to be the same as the slave's. */
1609         if (is_zero_ether_addr(bond->dev->dev_addr))
1610                 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1611                        slave_dev->addr_len);
1612
1613
1614         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1615         if (!new_slave) {
1616                 res = -ENOMEM;
1617                 goto err_undo_flags;
1618         }
1619
1620         /*
1621          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1622          * is set via sysfs or module option if desired.
1623          */
1624         new_slave->queue_id = 0;
1625
1626         /* Save slave's original mtu and then set it to match the bond */
1627         new_slave->original_mtu = slave_dev->mtu;
1628         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1629         if (res) {
1630                 pr_debug("Error %d calling dev_set_mtu\n", res);
1631                 goto err_free;
1632         }
1633
1634         /*
1635          * Save slave's original ("permanent") mac address for modes
1636          * that need it, and for restoring it upon release, and then
1637          * set it to the master's address
1638          */
1639         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1640
1641         if (!bond->params.fail_over_mac) {
1642                 /*
1643                  * Set slave to master's mac address.  The application already
1644                  * set the master's mac address to that of the first slave
1645                  */
1646                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1647                 addr.sa_family = slave_dev->type;
1648                 res = dev_set_mac_address(slave_dev, &addr);
1649                 if (res) {
1650                         pr_debug("Error %d calling set_mac_address\n", res);
1651                         goto err_restore_mtu;
1652                 }
1653         }
1654
1655         res = netdev_set_bond_master(slave_dev, bond_dev);
1656         if (res) {
1657                 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1658                 goto err_restore_mac;
1659         }
1660
1661         /* open the slave since the application closed it */
1662         res = dev_open(slave_dev);
1663         if (res) {
1664                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1665                 goto err_unset_master;
1666         }
1667
1668         new_slave->bond = bond;
1669         new_slave->dev = slave_dev;
1670         slave_dev->priv_flags |= IFF_BONDING;
1671
1672         if (bond_is_lb(bond)) {
1673                 /* bond_alb_init_slave() must be called before all other stages since
1674                  * it might fail and we do not want to have to undo everything
1675                  */
1676                 res = bond_alb_init_slave(bond, new_slave);
1677                 if (res)
1678                         goto err_close;
1679         }
1680
1681         /* If the mode USES_PRIMARY, then the new slave gets the
1682          * master's promisc (and mc) settings only if it becomes the
1683          * curr_active_slave, and that is taken care of later when calling
1684          * bond_change_active()
1685          */
1686         if (!USES_PRIMARY(bond->params.mode)) {
1687                 /* set promiscuity level to new slave */
1688                 if (bond_dev->flags & IFF_PROMISC) {
1689                         res = dev_set_promiscuity(slave_dev, 1);
1690                         if (res)
1691                                 goto err_close;
1692                 }
1693
1694                 /* set allmulti level to new slave */
1695                 if (bond_dev->flags & IFF_ALLMULTI) {
1696                         res = dev_set_allmulti(slave_dev, 1);
1697                         if (res)
1698                                 goto err_close;
1699                 }
1700
1701                 netif_addr_lock_bh(bond_dev);
1702                 /* upload master's mc_list to new slave */
1703                 netdev_for_each_mc_addr(ha, bond_dev)
1704                         dev_mc_add(slave_dev, ha->addr);
1705                 netif_addr_unlock_bh(bond_dev);
1706         }
1707
1708         if (bond->params.mode == BOND_MODE_8023AD) {
1709                 /* add lacpdu mc addr to mc list */
1710                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1711
1712                 dev_mc_add(slave_dev, lacpdu_multicast);
1713         }
1714
1715         bond_add_vlans_on_slave(bond, slave_dev);
1716
1717         write_lock_bh(&bond->lock);
1718
1719         bond_attach_slave(bond, new_slave);
1720
1721         new_slave->delay = 0;
1722         new_slave->link_failure_count = 0;
1723
1724         write_unlock_bh(&bond->lock);
1725
1726         bond_compute_features(bond);
1727
1728         read_lock(&bond->lock);
1729
1730         new_slave->last_arp_rx = jiffies -
1731                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1732
1733         if (bond->params.miimon && !bond->params.use_carrier) {
1734                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1735
1736                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1737                         /*
1738                          * miimon is set but a bonded network driver
1739                          * does not support ETHTOOL/MII and
1740                          * arp_interval is not set.  Note: if
1741                          * use_carrier is enabled, we will never go
1742                          * here (because netif_carrier is always
1743                          * supported); thus, we don't need to change
1744                          * the messages for netif_carrier.
1745                          */
1746                         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",
1747                                bond_dev->name, slave_dev->name);
1748                 } else if (link_reporting == -1) {
1749                         /* unable get link status using mii/ethtool */
1750                         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",
1751                                    bond_dev->name, slave_dev->name);
1752                 }
1753         }
1754
1755         /* check for initial state */
1756         if (bond->params.miimon) {
1757                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1758                         if (bond->params.updelay) {
1759                                 new_slave->link = BOND_LINK_BACK;
1760                                 new_slave->delay = bond->params.updelay;
1761                         } else {
1762                                 new_slave->link = BOND_LINK_UP;
1763                         }
1764                 } else {
1765                         new_slave->link = BOND_LINK_DOWN;
1766                 }
1767         } else if (bond->params.arp_interval) {
1768                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1769                         BOND_LINK_UP : BOND_LINK_DOWN);
1770         } else {
1771                 new_slave->link = BOND_LINK_UP;
1772         }
1773
1774         if (new_slave->link != BOND_LINK_DOWN)
1775                 new_slave->jiffies = jiffies;
1776         pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1777                 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1778                         (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1779
1780         bond_update_speed_duplex(new_slave);
1781
1782         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1783                 /* if there is a primary slave, remember it */
1784                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1785                         bond->primary_slave = new_slave;
1786                         bond->force_primary = true;
1787                 }
1788         }
1789
1790         write_lock_bh(&bond->curr_slave_lock);
1791
1792         switch (bond->params.mode) {
1793         case BOND_MODE_ACTIVEBACKUP:
1794                 bond_set_slave_inactive_flags(new_slave);
1795                 bond_select_active_slave(bond);
1796                 break;
1797         case BOND_MODE_8023AD:
1798                 /* in 802.3ad mode, the internal mechanism
1799                  * will activate the slaves in the selected
1800                  * aggregator
1801                  */
1802                 bond_set_slave_inactive_flags(new_slave);
1803                 /* if this is the first slave */
1804                 if (bond->slave_cnt == 1) {
1805                         SLAVE_AD_INFO(new_slave).id = 1;
1806                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1807                          * can be called only after the mac address of the bond is set
1808                          */
1809                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1810                 } else {
1811                         SLAVE_AD_INFO(new_slave).id =
1812                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1813                 }
1814
1815                 bond_3ad_bind_slave(new_slave);
1816                 break;
1817         case BOND_MODE_TLB:
1818         case BOND_MODE_ALB:
1819                 bond_set_active_slave(new_slave);
1820                 bond_set_slave_inactive_flags(new_slave);
1821                 bond_select_active_slave(bond);
1822                 break;
1823         default:
1824                 pr_debug("This slave is always active in trunk mode\n");
1825
1826                 /* always active in trunk mode */
1827                 bond_set_active_slave(new_slave);
1828
1829                 /* In trunking mode there is little meaning to curr_active_slave
1830                  * anyway (it holds no special properties of the bond device),
1831                  * so we can change it without calling change_active_interface()
1832                  */
1833                 if (!bond->curr_active_slave)
1834                         bond->curr_active_slave = new_slave;
1835
1836                 break;
1837         } /* switch(bond_mode) */
1838
1839         write_unlock_bh(&bond->curr_slave_lock);
1840
1841         bond_set_carrier(bond);
1842
1843 #ifdef CONFIG_NET_POLL_CONTROLLER
1844         slave_dev->npinfo = bond_netpoll_info(bond);
1845         if (slave_dev->npinfo) {
1846                 if (slave_enable_netpoll(new_slave)) {
1847                         read_unlock(&bond->lock);
1848                         pr_info("Error, %s: master_dev is using netpoll, "
1849                                  "but new slave device does not support netpoll.\n",
1850                                  bond_dev->name);
1851                         res = -EBUSY;
1852                         goto err_detach;
1853                 }
1854         }
1855 #endif
1856
1857         read_unlock(&bond->lock);
1858
1859         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1860         if (res)
1861                 goto err_detach;
1862
1863         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1864                                          new_slave);
1865         if (res) {
1866                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1867                 goto err_dest_symlinks;
1868         }
1869
1870         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1871                 bond_dev->name, slave_dev->name,
1872                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1873                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1874
1875         /* enslave is successful */
1876         return 0;
1877
1878 /* Undo stages on error */
1879 err_dest_symlinks:
1880         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1881
1882 err_detach:
1883         write_lock_bh(&bond->lock);
1884         bond_detach_slave(bond, new_slave);
1885         write_unlock_bh(&bond->lock);
1886
1887 err_close:
1888         dev_close(slave_dev);
1889
1890 err_unset_master:
1891         netdev_set_bond_master(slave_dev, NULL);
1892
1893 err_restore_mac:
1894         if (!bond->params.fail_over_mac) {
1895                 /* XXX TODO - fom follow mode needs to change master's
1896                  * MAC if this slave's MAC is in use by the bond, or at
1897                  * least print a warning.
1898                  */
1899                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1900                 addr.sa_family = slave_dev->type;
1901                 dev_set_mac_address(slave_dev, &addr);
1902         }
1903
1904 err_restore_mtu:
1905         dev_set_mtu(slave_dev, new_slave->original_mtu);
1906
1907 err_free:
1908         kfree(new_slave);
1909
1910 err_undo_flags:
1911         bond_compute_features(bond);
1912
1913         return res;
1914 }
1915
1916 /*
1917  * Try to release the slave device <slave> from the bond device <master>
1918  * It is legal to access curr_active_slave without a lock because all the function
1919  * is write-locked.
1920  *
1921  * The rules for slave state should be:
1922  *   for Active/Backup:
1923  *     Active stays on all backups go down
1924  *   for Bonded connections:
1925  *     The first up interface should be left on and all others downed.
1926  */
1927 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1928 {
1929         struct bonding *bond = netdev_priv(bond_dev);
1930         struct slave *slave, *oldcurrent;
1931         struct sockaddr addr;
1932         netdev_features_t old_features = bond_dev->features;
1933
1934         /* slave is not a slave or master is not master of this slave */
1935         if (!(slave_dev->flags & IFF_SLAVE) ||
1936             (slave_dev->master != bond_dev)) {
1937                 pr_err("%s: Error: cannot release %s.\n",
1938                        bond_dev->name, slave_dev->name);
1939                 return -EINVAL;
1940         }
1941
1942         block_netpoll_tx();
1943         netdev_bonding_change(bond_dev, NETDEV_RELEASE);
1944         write_lock_bh(&bond->lock);
1945
1946         slave = bond_get_slave_by_dev(bond, slave_dev);
1947         if (!slave) {
1948                 /* not a slave of this bond */
1949                 pr_info("%s: %s not enslaved\n",
1950                         bond_dev->name, slave_dev->name);
1951                 write_unlock_bh(&bond->lock);
1952                 unblock_netpoll_tx();
1953                 return -EINVAL;
1954         }
1955
1956         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1957          * for this slave anymore.
1958          */
1959         netdev_rx_handler_unregister(slave_dev);
1960         write_unlock_bh(&bond->lock);
1961         synchronize_net();
1962         write_lock_bh(&bond->lock);
1963
1964         if (!bond->params.fail_over_mac) {
1965                 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
1966                     bond->slave_cnt > 1)
1967                         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",
1968                                    bond_dev->name, slave_dev->name,
1969                                    slave->perm_hwaddr,
1970                                    bond_dev->name, slave_dev->name);
1971         }
1972
1973         /* Inform AD package of unbinding of slave. */
1974         if (bond->params.mode == BOND_MODE_8023AD) {
1975                 /* must be called before the slave is
1976                  * detached from the list
1977                  */
1978                 bond_3ad_unbind_slave(slave);
1979         }
1980
1981         pr_info("%s: releasing %s interface %s\n",
1982                 bond_dev->name,
1983                 bond_is_active_slave(slave) ? "active" : "backup",
1984                 slave_dev->name);
1985
1986         oldcurrent = bond->curr_active_slave;
1987
1988         bond->current_arp_slave = NULL;
1989
1990         /* release the slave from its bond */
1991         bond_detach_slave(bond, slave);
1992
1993         if (bond->primary_slave == slave)
1994                 bond->primary_slave = NULL;
1995
1996         if (oldcurrent == slave)
1997                 bond_change_active_slave(bond, NULL);
1998
1999         if (bond_is_lb(bond)) {
2000                 /* Must be called only after the slave has been
2001                  * detached from the list and the curr_active_slave
2002                  * has been cleared (if our_slave == old_current),
2003                  * but before a new active slave is selected.
2004                  */
2005                 write_unlock_bh(&bond->lock);
2006                 bond_alb_deinit_slave(bond, slave);
2007                 write_lock_bh(&bond->lock);
2008         }
2009
2010         if (oldcurrent == slave) {
2011                 /*
2012                  * Note that we hold RTNL over this sequence, so there
2013                  * is no concern that another slave add/remove event
2014                  * will interfere.
2015                  */
2016                 write_unlock_bh(&bond->lock);
2017                 read_lock(&bond->lock);
2018                 write_lock_bh(&bond->curr_slave_lock);
2019
2020                 bond_select_active_slave(bond);
2021
2022                 write_unlock_bh(&bond->curr_slave_lock);
2023                 read_unlock(&bond->lock);
2024                 write_lock_bh(&bond->lock);
2025         }
2026
2027         if (bond->slave_cnt == 0) {
2028                 bond_set_carrier(bond);
2029
2030                 /* if the last slave was removed, zero the mac address
2031                  * of the master so it will be set by the application
2032                  * to the mac address of the first slave
2033                  */
2034                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2035
2036                 if (bond_vlan_used(bond)) {
2037                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2038                                    bond_dev->name, bond_dev->name);
2039                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2040                                    bond_dev->name);
2041                 }
2042         }
2043
2044         write_unlock_bh(&bond->lock);
2045         unblock_netpoll_tx();
2046
2047         if (bond->slave_cnt == 0)
2048                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2049
2050         bond_compute_features(bond);
2051         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2052             (old_features & NETIF_F_VLAN_CHALLENGED))
2053                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2054                         bond_dev->name, slave_dev->name, bond_dev->name);
2055
2056         /* must do this from outside any spinlocks */
2057         bond_destroy_slave_symlinks(bond_dev, slave_dev);
2058
2059         bond_del_vlans_from_slave(bond, slave_dev);
2060
2061         /* If the mode USES_PRIMARY, then we should only remove its
2062          * promisc and mc settings if it was the curr_active_slave, but that was
2063          * already taken care of above when we detached the slave
2064          */
2065         if (!USES_PRIMARY(bond->params.mode)) {
2066                 /* unset promiscuity level from slave */
2067                 if (bond_dev->flags & IFF_PROMISC)
2068                         dev_set_promiscuity(slave_dev, -1);
2069
2070                 /* unset allmulti level from slave */
2071                 if (bond_dev->flags & IFF_ALLMULTI)
2072                         dev_set_allmulti(slave_dev, -1);
2073
2074                 /* flush master's mc_list from slave */
2075                 netif_addr_lock_bh(bond_dev);
2076                 bond_mc_list_flush(bond_dev, slave_dev);
2077                 netif_addr_unlock_bh(bond_dev);
2078         }
2079
2080         netdev_set_bond_master(slave_dev, NULL);
2081
2082         slave_disable_netpoll(slave);
2083
2084         /* close slave before restoring its mac address */
2085         dev_close(slave_dev);
2086
2087         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2088                 /* restore original ("permanent") mac address */
2089                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2090                 addr.sa_family = slave_dev->type;
2091                 dev_set_mac_address(slave_dev, &addr);
2092         }
2093
2094         dev_set_mtu(slave_dev, slave->original_mtu);
2095
2096         slave_dev->priv_flags &= ~IFF_BONDING;
2097
2098         kfree(slave);
2099
2100         return 0;  /* deletion OK */
2101 }
2102
2103 /*
2104 * First release a slave and then destroy the bond if no more slaves are left.
2105 * Must be under rtnl_lock when this function is called.
2106 */
2107 static int  bond_release_and_destroy(struct net_device *bond_dev,
2108                                      struct net_device *slave_dev)
2109 {
2110         struct bonding *bond = netdev_priv(bond_dev);
2111         int ret;
2112
2113         ret = bond_release(bond_dev, slave_dev);
2114         if ((ret == 0) && (bond->slave_cnt == 0)) {
2115                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2116                 pr_info("%s: destroying bond %s.\n",
2117                         bond_dev->name, bond_dev->name);
2118                 unregister_netdevice(bond_dev);
2119         }
2120         return ret;
2121 }
2122
2123 /*
2124  * This function releases all slaves.
2125  */
2126 static int bond_release_all(struct net_device *bond_dev)
2127 {
2128         struct bonding *bond = netdev_priv(bond_dev);
2129         struct slave *slave;
2130         struct net_device *slave_dev;
2131         struct sockaddr addr;
2132
2133         write_lock_bh(&bond->lock);
2134
2135         netif_carrier_off(bond_dev);
2136
2137         if (bond->slave_cnt == 0)
2138                 goto out;
2139
2140         bond->current_arp_slave = NULL;
2141         bond->primary_slave = NULL;
2142         bond_change_active_slave(bond, NULL);
2143
2144         while ((slave = bond->first_slave) != NULL) {
2145                 /* Inform AD package of unbinding of slave
2146                  * before slave is detached from the list.
2147                  */
2148                 if (bond->params.mode == BOND_MODE_8023AD)
2149                         bond_3ad_unbind_slave(slave);
2150
2151                 slave_dev = slave->dev;
2152                 bond_detach_slave(bond, slave);
2153
2154                 /* now that the slave is detached, unlock and perform
2155                  * all the undo steps that should not be called from
2156                  * within a lock.
2157                  */
2158                 write_unlock_bh(&bond->lock);
2159
2160                 /* unregister rx_handler early so bond_handle_frame wouldn't
2161                  * be called for this slave anymore.
2162                  */
2163                 netdev_rx_handler_unregister(slave_dev);
2164                 synchronize_net();
2165
2166                 if (bond_is_lb(bond)) {
2167                         /* must be called only after the slave
2168                          * has been detached from the list
2169                          */
2170                         bond_alb_deinit_slave(bond, slave);
2171                 }
2172
2173                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2174                 bond_del_vlans_from_slave(bond, slave_dev);
2175
2176                 /* If the mode USES_PRIMARY, then we should only remove its
2177                  * promisc and mc settings if it was the curr_active_slave, but that was
2178                  * already taken care of above when we detached the slave
2179                  */
2180                 if (!USES_PRIMARY(bond->params.mode)) {
2181                         /* unset promiscuity level from slave */
2182                         if (bond_dev->flags & IFF_PROMISC)
2183                                 dev_set_promiscuity(slave_dev, -1);
2184
2185                         /* unset allmulti level from slave */
2186                         if (bond_dev->flags & IFF_ALLMULTI)
2187                                 dev_set_allmulti(slave_dev, -1);
2188
2189                         /* flush master's mc_list from slave */
2190                         netif_addr_lock_bh(bond_dev);
2191                         bond_mc_list_flush(bond_dev, slave_dev);
2192                         netif_addr_unlock_bh(bond_dev);
2193                 }
2194
2195                 netdev_set_bond_master(slave_dev, NULL);
2196
2197                 slave_disable_netpoll(slave);
2198
2199                 /* close slave before restoring its mac address */
2200                 dev_close(slave_dev);
2201
2202                 if (!bond->params.fail_over_mac) {
2203                         /* restore original ("permanent") mac address*/
2204                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2205                         addr.sa_family = slave_dev->type;
2206                         dev_set_mac_address(slave_dev, &addr);
2207                 }
2208
2209                 kfree(slave);
2210
2211                 /* re-acquire the lock before getting the next slave */
2212                 write_lock_bh(&bond->lock);
2213         }
2214
2215         /* zero the mac address of the master so it will be
2216          * set by the application to the mac address of the
2217          * first slave
2218          */
2219         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2220
2221         if (bond_vlan_used(bond)) {
2222                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2223                            bond_dev->name, bond_dev->name);
2224                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2225                            bond_dev->name);
2226         }
2227
2228         pr_info("%s: released all slaves\n", bond_dev->name);
2229
2230 out:
2231         write_unlock_bh(&bond->lock);
2232
2233         bond_compute_features(bond);
2234
2235         return 0;
2236 }
2237
2238 /*
2239  * This function changes the active slave to slave <slave_dev>.
2240  * It returns -EINVAL in the following cases.
2241  *  - <slave_dev> is not found in the list.
2242  *  - There is not active slave now.
2243  *  - <slave_dev> is already active.
2244  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2245  *  - <slave_dev> is not running.
2246  * In these cases, this function does nothing.
2247  * In the other cases, current_slave pointer is changed and 0 is returned.
2248  */
2249 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2250 {
2251         struct bonding *bond = netdev_priv(bond_dev);
2252         struct slave *old_active = NULL;
2253         struct slave *new_active = NULL;
2254         int res = 0;
2255
2256         if (!USES_PRIMARY(bond->params.mode))
2257                 return -EINVAL;
2258
2259         /* Verify that master_dev is indeed the master of slave_dev */
2260         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2261                 return -EINVAL;
2262
2263         read_lock(&bond->lock);
2264
2265         read_lock(&bond->curr_slave_lock);
2266         old_active = bond->curr_active_slave;
2267         read_unlock(&bond->curr_slave_lock);
2268
2269         new_active = bond_get_slave_by_dev(bond, slave_dev);
2270
2271         /*
2272          * Changing to the current active: do nothing; return success.
2273          */
2274         if (new_active && (new_active == old_active)) {
2275                 read_unlock(&bond->lock);
2276                 return 0;
2277         }
2278
2279         if ((new_active) &&
2280             (old_active) &&
2281             (new_active->link == BOND_LINK_UP) &&
2282             IS_UP(new_active->dev)) {
2283                 block_netpoll_tx();
2284                 write_lock_bh(&bond->curr_slave_lock);
2285                 bond_change_active_slave(bond, new_active);
2286                 write_unlock_bh(&bond->curr_slave_lock);
2287                 unblock_netpoll_tx();
2288         } else
2289                 res = -EINVAL;
2290
2291         read_unlock(&bond->lock);
2292
2293         return res;
2294 }
2295
2296 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2297 {
2298         struct bonding *bond = netdev_priv(bond_dev);
2299
2300         info->bond_mode = bond->params.mode;
2301         info->miimon = bond->params.miimon;
2302
2303         read_lock(&bond->lock);
2304         info->num_slaves = bond->slave_cnt;
2305         read_unlock(&bond->lock);
2306
2307         return 0;
2308 }
2309
2310 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2311 {
2312         struct bonding *bond = netdev_priv(bond_dev);
2313         struct slave *slave;
2314         int i, res = -ENODEV;
2315
2316         read_lock(&bond->lock);
2317
2318         bond_for_each_slave(bond, slave, i) {
2319                 if (i == (int)info->slave_id) {
2320                         res = 0;
2321                         strcpy(info->slave_name, slave->dev->name);
2322                         info->link = slave->link;
2323                         info->state = bond_slave_state(slave);
2324                         info->link_failure_count = slave->link_failure_count;
2325                         break;
2326                 }
2327         }
2328
2329         read_unlock(&bond->lock);
2330
2331         return res;
2332 }
2333
2334 /*-------------------------------- Monitoring -------------------------------*/
2335
2336
2337 static int bond_miimon_inspect(struct bonding *bond)
2338 {
2339         struct slave *slave;
2340         int i, link_state, commit = 0;
2341         bool ignore_updelay;
2342
2343         ignore_updelay = !bond->curr_active_slave ? true : false;
2344
2345         bond_for_each_slave(bond, slave, i) {
2346                 slave->new_link = BOND_LINK_NOCHANGE;
2347
2348                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2349
2350                 switch (slave->link) {
2351                 case BOND_LINK_UP:
2352                         if (link_state)
2353                                 continue;
2354
2355                         slave->link = BOND_LINK_FAIL;
2356                         slave->delay = bond->params.downdelay;
2357                         if (slave->delay) {
2358                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2359                                         bond->dev->name,
2360                                         (bond->params.mode ==
2361                                          BOND_MODE_ACTIVEBACKUP) ?
2362                                         (bond_is_active_slave(slave) ?
2363                                          "active " : "backup ") : "",
2364                                         slave->dev->name,
2365                                         bond->params.downdelay * bond->params.miimon);
2366                         }
2367                         /*FALLTHRU*/
2368                 case BOND_LINK_FAIL:
2369                         if (link_state) {
2370                                 /*
2371                                  * recovered before downdelay expired
2372                                  */
2373                                 slave->link = BOND_LINK_UP;
2374                                 slave->jiffies = jiffies;
2375                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2376                                         bond->dev->name,
2377                                         (bond->params.downdelay - slave->delay) *
2378                                         bond->params.miimon,
2379                                         slave->dev->name);
2380                                 continue;
2381                         }
2382
2383                         if (slave->delay <= 0) {
2384                                 slave->new_link = BOND_LINK_DOWN;
2385                                 commit++;
2386                                 continue;
2387                         }
2388
2389                         slave->delay--;
2390                         break;
2391
2392                 case BOND_LINK_DOWN:
2393                         if (!link_state)
2394                                 continue;
2395
2396                         slave->link = BOND_LINK_BACK;
2397                         slave->delay = bond->params.updelay;
2398
2399                         if (slave->delay) {
2400                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2401                                         bond->dev->name, slave->dev->name,
2402                                         ignore_updelay ? 0 :
2403                                         bond->params.updelay *
2404                                         bond->params.miimon);
2405                         }
2406                         /*FALLTHRU*/
2407                 case BOND_LINK_BACK:
2408                         if (!link_state) {
2409                                 slave->link = BOND_LINK_DOWN;
2410                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2411                                         bond->dev->name,
2412                                         (bond->params.updelay - slave->delay) *
2413                                         bond->params.miimon,
2414                                         slave->dev->name);
2415
2416                                 continue;
2417                         }
2418
2419                         if (ignore_updelay)
2420                                 slave->delay = 0;
2421
2422                         if (slave->delay <= 0) {
2423                                 slave->new_link = BOND_LINK_UP;
2424                                 commit++;
2425                                 ignore_updelay = false;
2426                                 continue;
2427                         }
2428
2429                         slave->delay--;
2430                         break;
2431                 }
2432         }
2433
2434         return commit;
2435 }
2436
2437 static void bond_miimon_commit(struct bonding *bond)
2438 {
2439         struct slave *slave;
2440         int i;
2441
2442         bond_for_each_slave(bond, slave, i) {
2443                 switch (slave->new_link) {
2444                 case BOND_LINK_NOCHANGE:
2445                         continue;
2446
2447                 case BOND_LINK_UP:
2448                         slave->link = BOND_LINK_UP;
2449                         slave->jiffies = jiffies;
2450
2451                         if (bond->params.mode == BOND_MODE_8023AD) {
2452                                 /* prevent it from being the active one */
2453                                 bond_set_backup_slave(slave);
2454                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2455                                 /* make it immediately active */
2456                                 bond_set_active_slave(slave);
2457                         } else if (slave != bond->primary_slave) {
2458                                 /* prevent it from being the active one */
2459                                 bond_set_backup_slave(slave);
2460                         }
2461
2462                         bond_update_speed_duplex(slave);
2463
2464                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2465                                 bond->dev->name, slave->dev->name,
2466                                 slave->speed, slave->duplex ? "full" : "half");
2467
2468                         /* notify ad that the link status has changed */
2469                         if (bond->params.mode == BOND_MODE_8023AD)
2470                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2471
2472                         if (bond_is_lb(bond))
2473                                 bond_alb_handle_link_change(bond, slave,
2474                                                             BOND_LINK_UP);
2475
2476                         if (!bond->curr_active_slave ||
2477                             (slave == bond->primary_slave))
2478                                 goto do_failover;
2479
2480                         continue;
2481
2482                 case BOND_LINK_DOWN:
2483                         if (slave->link_failure_count < UINT_MAX)
2484                                 slave->link_failure_count++;
2485
2486                         slave->link = BOND_LINK_DOWN;
2487
2488                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2489                             bond->params.mode == BOND_MODE_8023AD)
2490                                 bond_set_slave_inactive_flags(slave);
2491
2492                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2493                                 bond->dev->name, slave->dev->name);
2494
2495                         if (bond->params.mode == BOND_MODE_8023AD)
2496                                 bond_3ad_handle_link_change(slave,
2497                                                             BOND_LINK_DOWN);
2498
2499                         if (bond_is_lb(bond))
2500                                 bond_alb_handle_link_change(bond, slave,
2501                                                             BOND_LINK_DOWN);
2502
2503                         if (slave == bond->curr_active_slave)
2504                                 goto do_failover;
2505
2506                         continue;
2507
2508                 default:
2509                         pr_err("%s: invalid new link %d on slave %s\n",
2510                                bond->dev->name, slave->new_link,
2511                                slave->dev->name);
2512                         slave->new_link = BOND_LINK_NOCHANGE;
2513
2514                         continue;
2515                 }
2516
2517 do_failover:
2518                 ASSERT_RTNL();
2519                 block_netpoll_tx();
2520                 write_lock_bh(&bond->curr_slave_lock);
2521                 bond_select_active_slave(bond);
2522                 write_unlock_bh(&bond->curr_slave_lock);
2523                 unblock_netpoll_tx();
2524         }
2525
2526         bond_set_carrier(bond);
2527 }
2528
2529 /*
2530  * bond_mii_monitor
2531  *
2532  * Really a wrapper that splits the mii monitor into two phases: an
2533  * inspection, then (if inspection indicates something needs to be done)
2534  * an acquisition of appropriate locks followed by a commit phase to
2535  * implement whatever link state changes are indicated.
2536  */
2537 void bond_mii_monitor(struct work_struct *work)
2538 {
2539         struct bonding *bond = container_of(work, struct bonding,
2540                                             mii_work.work);
2541         bool should_notify_peers = false;
2542         unsigned long delay;
2543
2544         read_lock(&bond->lock);
2545
2546         delay = msecs_to_jiffies(bond->params.miimon);
2547
2548         if (bond->slave_cnt == 0)
2549                 goto re_arm;
2550
2551         should_notify_peers = bond_should_notify_peers(bond);
2552
2553         if (bond_miimon_inspect(bond)) {
2554                 read_unlock(&bond->lock);
2555
2556                 /* Race avoidance with bond_close cancel of workqueue */
2557                 if (!rtnl_trylock()) {
2558                         read_lock(&bond->lock);
2559                         delay = 1;
2560                         should_notify_peers = false;
2561                         goto re_arm;
2562                 }
2563
2564                 read_lock(&bond->lock);
2565
2566                 bond_miimon_commit(bond);
2567
2568                 read_unlock(&bond->lock);
2569                 rtnl_unlock();  /* might sleep, hold no other locks */
2570                 read_lock(&bond->lock);
2571         }
2572
2573 re_arm:
2574         if (bond->params.miimon)
2575                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2576
2577         read_unlock(&bond->lock);
2578
2579         if (should_notify_peers) {
2580                 if (!rtnl_trylock()) {
2581                         read_lock(&bond->lock);
2582                         bond->send_peer_notif++;
2583                         read_unlock(&bond->lock);
2584                         return;
2585                 }
2586                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
2587                 rtnl_unlock();
2588         }
2589 }
2590
2591 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2592 {
2593         struct vlan_entry *vlan;
2594         struct net_device *vlan_dev;
2595
2596         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2597                 return 1;
2598
2599         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2600                 rcu_read_lock();
2601                 vlan_dev = __vlan_find_dev_deep(bond->dev, vlan->vlan_id);
2602                 rcu_read_unlock();
2603                 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
2604                         return 1;
2605         }
2606
2607         return 0;
2608 }
2609
2610 /*
2611  * We go to the (large) trouble of VLAN tagging ARP frames because
2612  * switches in VLAN mode (especially if ports are configured as
2613  * "native" to a VLAN) might not pass non-tagged frames.
2614  */
2615 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2616 {
2617         struct sk_buff *skb;
2618
2619         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2620                  slave_dev->name, dest_ip, src_ip, vlan_id);
2621
2622         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2623                          NULL, slave_dev->dev_addr, NULL);
2624
2625         if (!skb) {
2626                 pr_err("ARP packet allocation failed\n");
2627                 return;
2628         }
2629         if (vlan_id) {
2630                 skb = vlan_put_tag(skb, vlan_id);
2631                 if (!skb) {
2632                         pr_err("failed to insert VLAN tag\n");
2633                         return;
2634                 }
2635         }
2636         arp_xmit(skb);
2637 }
2638
2639
2640 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2641 {
2642         int i, vlan_id;
2643         __be32 *targets = bond->params.arp_targets;
2644         struct vlan_entry *vlan;
2645         struct net_device *vlan_dev = NULL;
2646         struct rtable *rt;
2647
2648         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2649                 __be32 addr;
2650                 if (!targets[i])
2651                         break;
2652                 pr_debug("basa: target %x\n", targets[i]);
2653                 if (!bond_vlan_used(bond)) {
2654                         pr_debug("basa: empty vlan: arp_send\n");
2655                         addr = bond_confirm_addr(bond->dev, targets[i], 0);
2656                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2657                                       addr, 0);
2658                         continue;
2659                 }
2660
2661                 /*
2662                  * If VLANs are configured, we do a route lookup to
2663                  * determine which VLAN interface would be used, so we
2664                  * can tag the ARP with the proper VLAN tag.
2665                  */
2666                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2667                                      RTO_ONLINK, 0);
2668                 if (IS_ERR(rt)) {
2669                         if (net_ratelimit()) {
2670                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2671                                            bond->dev->name, &targets[i]);
2672                         }
2673                         continue;
2674                 }
2675
2676                 /*
2677                  * This target is not on a VLAN
2678                  */
2679                 if (rt->dst.dev == bond->dev) {
2680                         ip_rt_put(rt);
2681                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2682                         addr = bond_confirm_addr(bond->dev, targets[i], 0);
2683                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2684                                       addr, 0);
2685                         continue;
2686                 }
2687
2688                 vlan_id = 0;
2689                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2690                         rcu_read_lock();
2691                         vlan_dev = __vlan_find_dev_deep(bond->dev,
2692                                                         vlan->vlan_id);
2693                         rcu_read_unlock();
2694                         if (vlan_dev == rt->dst.dev) {
2695                                 vlan_id = vlan->vlan_id;
2696                                 pr_debug("basa: vlan match on %s %d\n",
2697                                        vlan_dev->name, vlan_id);
2698                                 break;
2699                         }
2700                 }
2701
2702                 if (vlan_id && vlan_dev) {
2703                         ip_rt_put(rt);
2704                         addr = bond_confirm_addr(vlan_dev, targets[i], 0);
2705                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2706                                       addr, vlan_id);
2707                         continue;
2708                 }
2709
2710                 if (net_ratelimit()) {
2711                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2712                                    bond->dev->name, &targets[i],
2713                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2714                 }
2715                 ip_rt_put(rt);
2716         }
2717 }
2718
2719 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2720 {
2721         int i;
2722         __be32 *targets = bond->params.arp_targets;
2723
2724         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2725                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2726                          &sip, &tip, i, &targets[i],
2727                          bond_has_this_ip(bond, tip));
2728                 if (sip == targets[i]) {
2729                         if (bond_has_this_ip(bond, tip))
2730                                 slave->last_arp_rx = jiffies;
2731                         return;
2732                 }
2733         }
2734 }
2735
2736 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2737                         struct slave *slave)
2738 {
2739         struct arphdr *arp = (struct arphdr *)skb->data;
2740         unsigned char *arp_ptr;
2741         __be32 sip, tip;
2742         int alen;
2743
2744         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2745                 return RX_HANDLER_ANOTHER;
2746
2747         read_lock(&bond->lock);
2748         alen = arp_hdr_len(bond->dev);
2749
2750         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2751                  bond->dev->name, skb->dev->name);
2752
2753         if (alen > skb_headlen(skb)) {
2754                 arp = kmalloc(alen, GFP_ATOMIC);
2755                 if (!arp)
2756                         goto out_unlock;
2757                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2758                         goto out_unlock;
2759         }
2760
2761         if (arp->ar_hln != bond->dev->addr_len ||
2762             skb->pkt_type == PACKET_OTHERHOST ||
2763             skb->pkt_type == PACKET_LOOPBACK ||
2764             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2765             arp->ar_pro != htons(ETH_P_IP) ||
2766             arp->ar_pln != 4)
2767                 goto out_unlock;
2768
2769         arp_ptr = (unsigned char *)(arp + 1);
2770         arp_ptr += bond->dev->addr_len;
2771         memcpy(&sip, arp_ptr, 4);
2772         arp_ptr += 4 + bond->dev->addr_len;
2773         memcpy(&tip, arp_ptr, 4);
2774
2775         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2776                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2777                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2778                  &sip, &tip);
2779
2780         /*
2781          * Backup slaves won't see the ARP reply, but do come through
2782          * here for each ARP probe (so we swap the sip/tip to validate
2783          * the probe).  In a "redundant switch, common router" type of
2784          * configuration, the ARP probe will (hopefully) travel from
2785          * the active, through one switch, the router, then the other
2786          * switch before reaching the backup.
2787          */
2788         if (bond_is_active_slave(slave))
2789                 bond_validate_arp(bond, slave, sip, tip);
2790         else
2791                 bond_validate_arp(bond, slave, tip, sip);
2792
2793 out_unlock:
2794         read_unlock(&bond->lock);
2795         if (arp != (struct arphdr *)skb->data)
2796                 kfree(arp);
2797         return RX_HANDLER_ANOTHER;
2798 }
2799
2800 /*
2801  * this function is called regularly to monitor each slave's link
2802  * ensuring that traffic is being sent and received when arp monitoring
2803  * is used in load-balancing mode. if the adapter has been dormant, then an
2804  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2805  * arp monitoring in active backup mode.
2806  */
2807 void bond_loadbalance_arp_mon(struct work_struct *work)
2808 {
2809         struct bonding *bond = container_of(work, struct bonding,
2810                                             arp_work.work);
2811         struct slave *slave, *oldcurrent;
2812         int do_failover = 0;
2813         int delta_in_ticks;
2814         int i;
2815
2816         read_lock(&bond->lock);
2817
2818         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2819
2820         if (bond->slave_cnt == 0)
2821                 goto re_arm;
2822
2823         read_lock(&bond->curr_slave_lock);
2824         oldcurrent = bond->curr_active_slave;
2825         read_unlock(&bond->curr_slave_lock);
2826
2827         /* see if any of the previous devices are up now (i.e. they have
2828          * xmt and rcv traffic). the curr_active_slave does not come into
2829          * the picture unless it is null. also, slave->jiffies is not needed
2830          * here because we send an arp on each slave and give a slave as
2831          * long as it needs to get the tx/rx within the delta.
2832          * TODO: what about up/down delay in arp mode? it wasn't here before
2833          *       so it can wait
2834          */
2835         bond_for_each_slave(bond, slave, i) {
2836                 unsigned long trans_start = dev_trans_start(slave->dev);
2837
2838                 if (slave->link != BOND_LINK_UP) {
2839                         if (time_in_range(jiffies,
2840                                 trans_start - delta_in_ticks,
2841                                 trans_start + delta_in_ticks) &&
2842                             time_in_range(jiffies,
2843                                 slave->dev->last_rx - delta_in_ticks,
2844                                 slave->dev->last_rx + delta_in_ticks)) {
2845
2846                                 slave->link  = BOND_LINK_UP;
2847                                 bond_set_active_slave(slave);
2848
2849                                 /* primary_slave has no meaning in round-robin
2850                                  * mode. the window of a slave being up and
2851                                  * curr_active_slave being null after enslaving
2852                                  * is closed.
2853                                  */
2854                                 if (!oldcurrent) {
2855                                         pr_info("%s: link status definitely up for interface %s, ",
2856                                                 bond->dev->name,
2857                                                 slave->dev->name);
2858                                         do_failover = 1;
2859                                 } else {
2860                                         pr_info("%s: interface %s is now up\n",
2861                                                 bond->dev->name,
2862                                                 slave->dev->name);
2863                                 }
2864                         }
2865                 } else {
2866                         /* slave->link == BOND_LINK_UP */
2867
2868                         /* not all switches will respond to an arp request
2869                          * when the source ip is 0, so don't take the link down
2870                          * if we don't know our ip yet
2871                          */
2872                         if (!time_in_range(jiffies,
2873                                 trans_start - delta_in_ticks,
2874                                 trans_start + 2 * delta_in_ticks) ||
2875                             !time_in_range(jiffies,
2876                                 slave->dev->last_rx - delta_in_ticks,
2877                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2878
2879                                 slave->link  = BOND_LINK_DOWN;
2880                                 bond_set_backup_slave(slave);
2881
2882                                 if (slave->link_failure_count < UINT_MAX)
2883                                         slave->link_failure_count++;
2884
2885                                 pr_info("%s: interface %s is now down.\n",
2886                                         bond->dev->name,
2887                                         slave->dev->name);
2888
2889                                 if (slave == oldcurrent)
2890                                         do_failover = 1;
2891                         }
2892                 }
2893
2894                 /* note: if switch is in round-robin mode, all links
2895                  * must tx arp to ensure all links rx an arp - otherwise
2896                  * links may oscillate or not come up at all; if switch is
2897                  * in something like xor mode, there is nothing we can
2898                  * do - all replies will be rx'ed on same link causing slaves
2899                  * to be unstable during low/no traffic periods
2900                  */
2901                 if (IS_UP(slave->dev))
2902                         bond_arp_send_all(bond, slave);
2903         }
2904
2905         if (do_failover) {
2906                 block_netpoll_tx();
2907                 write_lock_bh(&bond->curr_slave_lock);
2908
2909                 bond_select_active_slave(bond);
2910
2911                 write_unlock_bh(&bond->curr_slave_lock);
2912                 unblock_netpoll_tx();
2913         }
2914
2915 re_arm:
2916         if (bond->params.arp_interval)
2917                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2918
2919         read_unlock(&bond->lock);
2920 }
2921
2922 /*
2923  * Called to inspect slaves for active-backup mode ARP monitor link state
2924  * changes.  Sets new_link in slaves to specify what action should take
2925  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2926  * to link states must be committed.
2927  *
2928  * Called with bond->lock held for read.
2929  */
2930 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2931 {
2932         struct slave *slave;
2933         int i, commit = 0;
2934         unsigned long trans_start;
2935
2936         bond_for_each_slave(bond, slave, i) {
2937                 slave->new_link = BOND_LINK_NOCHANGE;
2938
2939                 if (slave->link != BOND_LINK_UP) {
2940                         if (time_in_range(jiffies,
2941                                 slave_last_rx(bond, slave) - delta_in_ticks,
2942                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2943
2944                                 slave->new_link = BOND_LINK_UP;
2945                                 commit++;
2946                         }
2947
2948                         continue;
2949                 }
2950
2951                 /*
2952                  * Give slaves 2*delta after being enslaved or made
2953                  * active.  This avoids bouncing, as the last receive
2954                  * times need a full ARP monitor cycle to be updated.
2955                  */
2956                 if (time_in_range(jiffies,
2957                                   slave->jiffies - delta_in_ticks,
2958                                   slave->jiffies + 2 * delta_in_ticks))
2959                         continue;
2960
2961                 /*
2962                  * Backup slave is down if:
2963                  * - No current_arp_slave AND
2964                  * - more than 3*delta since last receive AND
2965                  * - the bond has an IP address
2966                  *
2967                  * Note: a non-null current_arp_slave indicates
2968                  * the curr_active_slave went down and we are
2969                  * searching for a new one; under this condition
2970                  * we only take the curr_active_slave down - this
2971                  * gives each slave a chance to tx/rx traffic
2972                  * before being taken out
2973                  */
2974                 if (!bond_is_active_slave(slave) &&
2975                     !bond->current_arp_slave &&
2976                     !time_in_range(jiffies,
2977                         slave_last_rx(bond, slave) - delta_in_ticks,
2978                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2979
2980                         slave->new_link = BOND_LINK_DOWN;
2981                         commit++;
2982                 }
2983
2984                 /*
2985                  * Active slave is down if:
2986                  * - more than 2*delta since transmitting OR
2987                  * - (more than 2*delta since receive AND
2988                  *    the bond has an IP address)
2989                  */
2990                 trans_start = dev_trans_start(slave->dev);
2991                 if (bond_is_active_slave(slave) &&
2992                     (!time_in_range(jiffies,
2993                         trans_start - delta_in_ticks,
2994                         trans_start + 2 * delta_in_ticks) ||
2995                      !time_in_range(jiffies,
2996                         slave_last_rx(bond, slave) - delta_in_ticks,
2997                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2998
2999                         slave->new_link = BOND_LINK_DOWN;
3000                         commit++;
3001                 }
3002         }
3003
3004         return commit;
3005 }
3006
3007 /*
3008  * Called to commit link state changes noted by inspection step of
3009  * active-backup mode ARP monitor.
3010  *
3011  * Called with RTNL and bond->lock for read.
3012  */
3013 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3014 {
3015         struct slave *slave;
3016         int i;
3017         unsigned long trans_start;
3018
3019         bond_for_each_slave(bond, slave, i) {
3020                 switch (slave->new_link) {
3021                 case BOND_LINK_NOCHANGE:
3022                         continue;
3023
3024                 case BOND_LINK_UP:
3025                         trans_start = dev_trans_start(slave->dev);
3026                         if ((!bond->curr_active_slave &&
3027                              time_in_range(jiffies,
3028                                            trans_start - delta_in_ticks,
3029                                            trans_start + delta_in_ticks)) ||
3030                             bond->curr_active_slave != slave) {
3031                                 slave->link = BOND_LINK_UP;
3032                                 if (bond->current_arp_slave) {
3033                                         bond_set_slave_inactive_flags(
3034                                                 bond->current_arp_slave);
3035                                         bond->current_arp_slave = NULL;
3036                                 }
3037
3038                                 pr_info("%s: link status definitely up for interface %s.\n",
3039                                         bond->dev->name, slave->dev->name);
3040
3041                                 if (!bond->curr_active_slave ||
3042                                     (slave == bond->primary_slave))
3043                                         goto do_failover;
3044
3045                         }
3046
3047                         continue;
3048
3049                 case BOND_LINK_DOWN:
3050                         if (slave->link_failure_count < UINT_MAX)
3051                                 slave->link_failure_count++;
3052
3053                         slave->link = BOND_LINK_DOWN;
3054                         bond_set_slave_inactive_flags(slave);
3055
3056                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3057                                 bond->dev->name, slave->dev->name);
3058
3059                         if (slave == bond->curr_active_slave) {
3060                                 bond->current_arp_slave = NULL;
3061                                 goto do_failover;
3062                         }
3063
3064                         continue;
3065
3066                 default:
3067                         pr_err("%s: impossible: new_link %d on slave %s\n",
3068                                bond->dev->name, slave->new_link,
3069                                slave->dev->name);
3070                         continue;
3071                 }
3072
3073 do_failover:
3074                 ASSERT_RTNL();
3075                 block_netpoll_tx();
3076                 write_lock_bh(&bond->curr_slave_lock);
3077                 bond_select_active_slave(bond);
3078                 write_unlock_bh(&bond->curr_slave_lock);
3079                 unblock_netpoll_tx();
3080         }
3081
3082         bond_set_carrier(bond);
3083 }
3084
3085 /*
3086  * Send ARP probes for active-backup mode ARP monitor.
3087  *
3088  * Called with bond->lock held for read.
3089  */
3090 static void bond_ab_arp_probe(struct bonding *bond)
3091 {
3092         struct slave *slave;
3093         int i;
3094
3095         read_lock(&bond->curr_slave_lock);
3096
3097         if (bond->current_arp_slave && bond->curr_active_slave)
3098                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3099                         bond->current_arp_slave->dev->name,
3100                         bond->curr_active_slave->dev->name);
3101
3102         if (bond->curr_active_slave) {
3103                 bond_arp_send_all(bond, bond->curr_active_slave);
3104                 read_unlock(&bond->curr_slave_lock);
3105                 return;
3106         }
3107
3108         read_unlock(&bond->curr_slave_lock);
3109
3110         /* if we don't have a curr_active_slave, search for the next available
3111          * backup slave from the current_arp_slave and make it the candidate
3112          * for becoming the curr_active_slave
3113          */
3114
3115         if (!bond->current_arp_slave) {
3116                 bond->current_arp_slave = bond->first_slave;
3117                 if (!bond->current_arp_slave)
3118                         return;
3119         }
3120
3121         bond_set_slave_inactive_flags(bond->current_arp_slave);
3122
3123         /* search for next candidate */
3124         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3125                 if (IS_UP(slave->dev)) {
3126                         slave->link = BOND_LINK_BACK;
3127                         bond_set_slave_active_flags(slave);
3128                         bond_arp_send_all(bond, slave);
3129                         slave->jiffies = jiffies;
3130                         bond->current_arp_slave = slave;
3131                         break;
3132                 }
3133
3134                 /* if the link state is up at this point, we
3135                  * mark it down - this can happen if we have
3136                  * simultaneous link failures and
3137                  * reselect_active_interface doesn't make this
3138                  * one the current slave so it is still marked
3139                  * up when it is actually down
3140                  */
3141                 if (slave->link == BOND_LINK_UP) {
3142                         slave->link = BOND_LINK_DOWN;
3143                         if (slave->link_failure_count < UINT_MAX)
3144                                 slave->link_failure_count++;
3145
3146                         bond_set_slave_inactive_flags(slave);
3147
3148                         pr_info("%s: backup interface %s is now down.\n",
3149                                 bond->dev->name, slave->dev->name);
3150                 }
3151         }
3152 }
3153
3154 void bond_activebackup_arp_mon(struct work_struct *work)
3155 {
3156         struct bonding *bond = container_of(work, struct bonding,
3157                                             arp_work.work);
3158         bool should_notify_peers = false;
3159         int delta_in_ticks;
3160
3161         read_lock(&bond->lock);
3162
3163         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3164
3165         if (bond->slave_cnt == 0)
3166                 goto re_arm;
3167
3168         should_notify_peers = bond_should_notify_peers(bond);
3169
3170         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3171                 read_unlock(&bond->lock);
3172
3173                 /* Race avoidance with bond_close flush of workqueue */
3174                 if (!rtnl_trylock()) {
3175                         read_lock(&bond->lock);
3176                         delta_in_ticks = 1;
3177                         should_notify_peers = false;
3178                         goto re_arm;
3179                 }
3180
3181                 read_lock(&bond->lock);
3182
3183                 bond_ab_arp_commit(bond, delta_in_ticks);
3184
3185                 read_unlock(&bond->lock);
3186                 rtnl_unlock();
3187                 read_lock(&bond->lock);
3188         }
3189
3190         bond_ab_arp_probe(bond);
3191
3192 re_arm:
3193         if (bond->params.arp_interval)
3194                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3195
3196         read_unlock(&bond->lock);
3197
3198         if (should_notify_peers) {
3199                 if (!rtnl_trylock()) {
3200                         read_lock(&bond->lock);
3201                         bond->send_peer_notif++;
3202                         read_unlock(&bond->lock);
3203                         return;
3204                 }
3205                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
3206                 rtnl_unlock();
3207         }
3208 }
3209
3210 /*-------------------------- netdev event handling --------------------------*/
3211
3212 /*
3213  * Change device name
3214  */
3215 static int bond_event_changename(struct bonding *bond)
3216 {
3217         bond_remove_proc_entry(bond);
3218         bond_create_proc_entry(bond);
3219
3220         bond_debug_reregister(bond);
3221
3222         return NOTIFY_DONE;
3223 }
3224
3225 static int bond_master_netdev_event(unsigned long event,
3226                                     struct net_device *bond_dev)
3227 {
3228         struct bonding *event_bond = netdev_priv(bond_dev);
3229
3230         switch (event) {
3231         case NETDEV_CHANGENAME:
3232                 return bond_event_changename(event_bond);
3233         default:
3234                 break;
3235         }
3236
3237         return NOTIFY_DONE;
3238 }
3239
3240 static int bond_slave_netdev_event(unsigned long event,
3241                                    struct net_device *slave_dev)
3242 {
3243         struct net_device *bond_dev = slave_dev->master;
3244         struct bonding *bond = netdev_priv(bond_dev);
3245         struct slave *slave = NULL;
3246
3247         switch (event) {
3248         case NETDEV_UNREGISTER:
3249                 if (bond_dev) {
3250                         if (bond->setup_by_slave)
3251                                 bond_release_and_destroy(bond_dev, slave_dev);
3252                         else
3253                                 bond_release(bond_dev, slave_dev);
3254                 }
3255                 break;
3256         case NETDEV_UP:
3257         case NETDEV_CHANGE:
3258                 slave = bond_get_slave_by_dev(bond, slave_dev);
3259                 if (slave) {
3260                         u32 old_speed = slave->speed;
3261                         u8  old_duplex = slave->duplex;
3262
3263                         bond_update_speed_duplex(slave);
3264
3265                         if (bond->params.mode == BOND_MODE_8023AD) {
3266                                 if (old_speed != slave->speed)
3267                                         bond_3ad_adapter_speed_changed(slave);
3268                                 if (old_duplex != slave->duplex)
3269                                         bond_3ad_adapter_duplex_changed(slave);
3270                         }
3271                 }
3272
3273                 break;
3274         case NETDEV_DOWN:
3275                 /*
3276                  * ... Or is it this?
3277                  */
3278                 break;
3279         case NETDEV_CHANGEMTU:
3280                 /*
3281                  * TODO: Should slaves be allowed to
3282                  * independently alter their MTU?  For
3283                  * an active-backup bond, slaves need
3284                  * not be the same type of device, so
3285                  * MTUs may vary.  For other modes,
3286                  * slaves arguably should have the
3287                  * same MTUs. To do this, we'd need to
3288                  * take over the slave's change_mtu
3289                  * function for the duration of their
3290                  * servitude.
3291                  */
3292                 break;
3293         case NETDEV_CHANGENAME:
3294                 /*
3295                  * TODO: handle changing the primary's name
3296                  */
3297                 break;
3298         case NETDEV_FEAT_CHANGE:
3299                 bond_compute_features(bond);
3300                 break;
3301         default:
3302                 break;
3303         }
3304
3305         return NOTIFY_DONE;
3306 }
3307
3308 /*
3309  * bond_netdev_event: handle netdev notifier chain events.
3310  *
3311  * This function receives events for the netdev chain.  The caller (an
3312  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3313  * locks for us to safely manipulate the slave devices (RTNL lock,
3314  * dev_probe_lock).
3315  */
3316 static int bond_netdev_event(struct notifier_block *this,
3317                              unsigned long event, void *ptr)
3318 {
3319         struct net_device *event_dev = (struct net_device *)ptr;
3320
3321         pr_debug("event_dev: %s, event: %lx\n",
3322                  event_dev ? event_dev->name : "None",
3323                  event);
3324
3325         if (!(event_dev->priv_flags & IFF_BONDING))
3326                 return NOTIFY_DONE;
3327
3328         if (event_dev->flags & IFF_MASTER) {
3329                 pr_debug("IFF_MASTER\n");
3330                 return bond_master_netdev_event(event, event_dev);
3331         }
3332
3333         if (event_dev->flags & IFF_SLAVE) {
3334                 pr_debug("IFF_SLAVE\n");
3335                 return bond_slave_netdev_event(event, event_dev);
3336         }
3337
3338         return NOTIFY_DONE;
3339 }
3340
3341 static struct notifier_block bond_netdev_notifier = {
3342         .notifier_call = bond_netdev_event,
3343 };
3344
3345 /*---------------------------- Hashing Policies -----------------------------*/
3346
3347 /*
3348  * Hash for the output device based upon layer 2 and layer 3 data. If
3349  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3350  */
3351 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3352 {
3353         struct ethhdr *data = (struct ethhdr *)skb->data;
3354         struct iphdr *iph = ip_hdr(skb);
3355
3356         if (skb->protocol == htons(ETH_P_IP)) {
3357                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3358                         (data->h_dest[5] ^ data->h_source[5])) % count;
3359         }
3360
3361         return (data->h_dest[5] ^ data->h_source[5]) % count;
3362 }
3363
3364 /*
3365  * Hash for the output device based upon layer 3 and layer 4 data. If
3366  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3367  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3368  */
3369 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3370 {
3371         struct ethhdr *data = (struct ethhdr *)skb->data;
3372         struct iphdr *iph = ip_hdr(skb);
3373         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3374         int layer4_xor = 0;
3375
3376         if (skb->protocol == htons(ETH_P_IP)) {
3377                 if (!ip_is_fragment(iph) &&
3378                     (iph->protocol == IPPROTO_TCP ||
3379                      iph->protocol == IPPROTO_UDP)) {
3380                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3381                 }
3382                 return (layer4_xor ^
3383                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3384
3385         }
3386
3387         return (data->h_dest[5] ^ data->h_source[5]) % count;
3388 }
3389
3390 /*
3391  * Hash for the output device based upon layer 2 data
3392  */
3393 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3394 {
3395         struct ethhdr *data = (struct ethhdr *)skb->data;
3396
3397         return (data->h_dest[5] ^ data->h_source[5]) % count;
3398 }
3399
3400 /*-------------------------- Device entry points ----------------------------*/
3401
3402 static int bond_open(struct net_device *bond_dev)
3403 {
3404         struct bonding *bond = netdev_priv(bond_dev);
3405         struct slave *slave;
3406         int i;
3407
3408         /* reset slave->backup and slave->inactive */
3409         read_lock(&bond->lock);
3410         if (bond->slave_cnt > 0) {
3411                 read_lock(&bond->curr_slave_lock);
3412                 bond_for_each_slave(bond, slave, i) {
3413                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3414                                 && (slave != bond->curr_active_slave)) {
3415                                 bond_set_slave_inactive_flags(slave);
3416                         } else {
3417                                 bond_set_slave_active_flags(slave);
3418                         }
3419                 }
3420                 read_unlock(&bond->curr_slave_lock);
3421         }
3422         read_unlock(&bond->lock);
3423
3424         INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3425
3426         if (bond_is_lb(bond)) {
3427                 /* bond_alb_initialize must be called before the timer
3428                  * is started.
3429                  */
3430                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3431                         /* something went wrong - fail the open operation */
3432                         return -ENOMEM;
3433                 }
3434
3435                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3436                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3437         }
3438
3439         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3440                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3441                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3442         }
3443
3444         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3445                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3446                         INIT_DELAYED_WORK(&bond->arp_work,
3447                                           bond_activebackup_arp_mon);
3448                 else
3449                         INIT_DELAYED_WORK(&bond->arp_work,
3450                                           bond_loadbalance_arp_mon);
3451
3452                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3453                 if (bond->params.arp_validate)
3454                         bond->recv_probe = bond_arp_rcv;
3455         }
3456
3457         if (bond->params.mode == BOND_MODE_8023AD) {
3458                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3459                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3460                 /* register to receive LACPDUs */
3461                 bond->recv_probe = bond_3ad_lacpdu_recv;
3462                 bond_3ad_initiate_agg_selection(bond, 1);
3463         }
3464
3465         return 0;
3466 }
3467
3468 static int bond_close(struct net_device *bond_dev)
3469 {
3470         struct bonding *bond = netdev_priv(bond_dev);
3471
3472         write_lock_bh(&bond->lock);
3473
3474         bond->send_peer_notif = 0;
3475
3476         write_unlock_bh(&bond->lock);
3477
3478         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3479                 cancel_delayed_work_sync(&bond->mii_work);
3480         }
3481
3482         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3483                 cancel_delayed_work_sync(&bond->arp_work);
3484         }
3485
3486         switch (bond->params.mode) {
3487         case BOND_MODE_8023AD:
3488                 cancel_delayed_work_sync(&bond->ad_work);
3489                 break;
3490         case BOND_MODE_TLB:
3491         case BOND_MODE_ALB:
3492                 cancel_delayed_work_sync(&bond->alb_work);
3493                 break;
3494         default:
3495                 break;
3496         }
3497
3498         if (delayed_work_pending(&bond->mcast_work))
3499                 cancel_delayed_work_sync(&bond->mcast_work);
3500
3501         if (bond_is_lb(bond)) {
3502                 /* Must be called only after all
3503                  * slaves have been released
3504                  */
3505                 bond_alb_deinitialize(bond);
3506         }
3507         bond->recv_probe = NULL;
3508
3509         return 0;
3510 }
3511
3512 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3513                                                 struct rtnl_link_stats64 *stats)
3514 {
3515         struct bonding *bond = netdev_priv(bond_dev);
3516         struct rtnl_link_stats64 temp;
3517         struct slave *slave;
3518         int i;
3519
3520         memset(stats, 0, sizeof(*stats));
3521
3522         read_lock_bh(&bond->lock);
3523
3524         bond_for_each_slave(bond, slave, i) {
3525                 const struct rtnl_link_stats64 *sstats =
3526                         dev_get_stats(slave->dev, &temp);
3527
3528                 stats->rx_packets += sstats->rx_packets;
3529                 stats->rx_bytes += sstats->rx_bytes;
3530                 stats->rx_errors += sstats->rx_errors;
3531                 stats->rx_dropped += sstats->rx_dropped;
3532
3533                 stats->tx_packets += sstats->tx_packets;
3534                 stats->tx_bytes += sstats->tx_bytes;
3535                 stats->tx_errors += sstats->tx_errors;
3536                 stats->tx_dropped += sstats->tx_dropped;
3537
3538                 stats->multicast += sstats->multicast;
3539                 stats->collisions += sstats->collisions;
3540
3541                 stats->rx_length_errors += sstats->rx_length_errors;
3542                 stats->rx_over_errors += sstats->rx_over_errors;
3543                 stats->rx_crc_errors += sstats->rx_crc_errors;
3544                 stats->rx_frame_errors += sstats->rx_frame_errors;
3545                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3546                 stats->rx_missed_errors += sstats->rx_missed_errors;
3547
3548                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3549                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3550                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3551                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3552                 stats->tx_window_errors += sstats->tx_window_errors;
3553         }
3554
3555         read_unlock_bh(&bond->lock);
3556
3557         return stats;
3558 }
3559
3560 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3561 {
3562         struct net_device *slave_dev = NULL;
3563         struct ifbond k_binfo;
3564         struct ifbond __user *u_binfo = NULL;
3565         struct ifslave k_sinfo;
3566         struct ifslave __user *u_sinfo = NULL;
3567         struct mii_ioctl_data *mii = NULL;
3568         int res = 0;
3569
3570         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3571
3572         switch (cmd) {
3573         case SIOCGMIIPHY:
3574                 mii = if_mii(ifr);
3575                 if (!mii)
3576                         return -EINVAL;
3577
3578                 mii->phy_id = 0;
3579                 /* Fall Through */
3580         case SIOCGMIIREG:
3581                 /*
3582                  * We do this again just in case we were called by SIOCGMIIREG
3583                  * instead of SIOCGMIIPHY.
3584                  */
3585                 mii = if_mii(ifr);
3586                 if (!mii)
3587                         return -EINVAL;
3588
3589
3590                 if (mii->reg_num == 1) {
3591                         struct bonding *bond = netdev_priv(bond_dev);
3592                         mii->val_out = 0;
3593                         read_lock(&bond->lock);
3594                         read_lock(&bond->curr_slave_lock);
3595                         if (netif_carrier_ok(bond->dev))
3596                                 mii->val_out = BMSR_LSTATUS;
3597
3598                         read_unlock(&bond->curr_slave_lock);
3599                         read_unlock(&bond->lock);
3600                 }
3601
3602                 return 0;
3603         case BOND_INFO_QUERY_OLD:
3604         case SIOCBONDINFOQUERY:
3605                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3606
3607                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3608                         return -EFAULT;
3609
3610                 res = bond_info_query(bond_dev, &k_binfo);
3611                 if (res == 0 &&
3612                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3613                         return -EFAULT;
3614
3615                 return res;
3616         case BOND_SLAVE_INFO_QUERY_OLD:
3617         case SIOCBONDSLAVEINFOQUERY:
3618                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3619
3620                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3621                         return -EFAULT;
3622
3623                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3624                 if (res == 0 &&
3625                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3626                         return -EFAULT;
3627
3628                 return res;
3629         default:
3630                 /* Go on */
3631                 break;
3632         }
3633
3634         if (!capable(CAP_NET_ADMIN))
3635                 return -EPERM;
3636
3637         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3638
3639         pr_debug("slave_dev=%p:\n", slave_dev);
3640
3641         if (!slave_dev)
3642                 res = -ENODEV;
3643         else {
3644                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3645                 switch (cmd) {
3646                 case BOND_ENSLAVE_OLD:
3647                 case SIOCBONDENSLAVE:
3648                         res = bond_enslave(bond_dev, slave_dev);
3649                         break;
3650                 case BOND_RELEASE_OLD:
3651                 case SIOCBONDRELEASE:
3652                         res = bond_release(bond_dev, slave_dev);
3653                         break;
3654                 case BOND_SETHWADDR_OLD:
3655                 case SIOCBONDSETHWADDR:
3656                         res = bond_sethwaddr(bond_dev, slave_dev);
3657                         break;
3658                 case BOND_CHANGE_ACTIVE_OLD:
3659                 case SIOCBONDCHANGEACTIVE:
3660                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3661                         break;
3662                 default:
3663                         res = -EOPNOTSUPP;
3664                 }
3665
3666                 dev_put(slave_dev);
3667         }
3668
3669         return res;
3670 }
3671
3672 static bool bond_addr_in_mc_list(unsigned char *addr,
3673                                  struct netdev_hw_addr_list *list,
3674                                  int addrlen)
3675 {
3676         struct netdev_hw_addr *ha;
3677
3678         netdev_hw_addr_list_for_each(ha, list)
3679                 if (!memcmp(ha->addr, addr, addrlen))
3680                         return true;
3681
3682         return false;
3683 }
3684
3685 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3686 {
3687         struct bonding *bond = netdev_priv(bond_dev);
3688
3689         if (change & IFF_PROMISC)
3690                 bond_set_promiscuity(bond,
3691                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3692
3693         if (change & IFF_ALLMULTI)
3694                 bond_set_allmulti(bond,
3695                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3696 }
3697
3698 static void bond_set_multicast_list(struct net_device *bond_dev)
3699 {
3700         struct bonding *bond = netdev_priv(bond_dev);
3701         struct netdev_hw_addr *ha;
3702         bool found;
3703
3704         read_lock(&bond->lock);
3705
3706         /* looking for addresses to add to slaves' mc list */
3707         netdev_for_each_mc_addr(ha, bond_dev) {
3708                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3709                                              bond_dev->addr_len);
3710                 if (!found)
3711                         bond_mc_add(bond, ha->addr);
3712         }
3713
3714         /* looking for addresses to delete from slaves' list */
3715         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3716                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3717                                              bond_dev->addr_len);
3718                 if (!found)
3719                         bond_mc_del(bond, ha->addr);
3720         }
3721
3722         /* save master's multicast list */
3723         __hw_addr_flush(&bond->mc_list);
3724         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3725                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3726
3727         read_unlock(&bond->lock);
3728 }
3729
3730 static int bond_neigh_init(struct neighbour *n)
3731 {
3732         struct bonding *bond = netdev_priv(n->dev);
3733         struct slave *slave = bond->first_slave;
3734         const struct net_device_ops *slave_ops;
3735         struct neigh_parms parms;
3736         int ret;
3737
3738         if (!slave)
3739                 return 0;
3740
3741         slave_ops = slave->dev->netdev_ops;
3742
3743         if (!slave_ops->ndo_neigh_setup)
3744                 return 0;
3745
3746         parms.neigh_setup = NULL;
3747         parms.neigh_cleanup = NULL;
3748         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3749         if (ret)
3750                 return ret;
3751
3752         /*
3753          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3754          * after the last slave has been detached.  Assumes that all slaves
3755          * utilize the same neigh_cleanup (true at this writing as only user
3756          * is ipoib).
3757          */
3758         n->parms->neigh_cleanup = parms.neigh_cleanup;
3759
3760         if (!parms.neigh_setup)
3761                 return 0;
3762
3763         return parms.neigh_setup(n);
3764 }
3765
3766 /*
3767  * The bonding ndo_neigh_setup is called at init time beofre any
3768  * slave exists. So we must declare proxy setup function which will
3769  * be used at run time to resolve the actual slave neigh param setup.
3770  */
3771 static int bond_neigh_setup(struct net_device *dev,
3772                             struct neigh_parms *parms)
3773 {
3774         parms->neigh_setup   = bond_neigh_init;
3775
3776         return 0;
3777 }
3778
3779 /*
3780  * Change the MTU of all of a master's slaves to match the master
3781  */
3782 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3783 {
3784         struct bonding *bond = netdev_priv(bond_dev);
3785         struct slave *slave, *stop_at;
3786         int res = 0;
3787         int i;
3788
3789         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3790                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3791
3792         /* Can't hold bond->lock with bh disabled here since
3793          * some base drivers panic. On the other hand we can't
3794          * hold bond->lock without bh disabled because we'll
3795          * deadlock. The only solution is to rely on the fact
3796          * that we're under rtnl_lock here, and the slaves
3797          * list won't change. This doesn't solve the problem
3798          * of setting the slave's MTU while it is
3799          * transmitting, but the assumption is that the base
3800          * driver can handle that.
3801          *
3802          * TODO: figure out a way to safely iterate the slaves
3803          * list, but without holding a lock around the actual
3804          * call to the base driver.
3805          */
3806
3807         bond_for_each_slave(bond, slave, i) {
3808                 pr_debug("s %p s->p %p c_m %p\n",
3809                          slave,
3810                          slave->prev,
3811                          slave->dev->netdev_ops->ndo_change_mtu);
3812
3813                 res = dev_set_mtu(slave->dev, new_mtu);
3814
3815                 if (res) {
3816                         /* If we failed to set the slave's mtu to the new value
3817                          * we must abort the operation even in ACTIVE_BACKUP
3818                          * mode, because if we allow the backup slaves to have
3819                          * different mtu values than the active slave we'll
3820                          * need to change their mtu when doing a failover. That
3821                          * means changing their mtu from timer context, which
3822                          * is probably not a good idea.
3823                          */
3824                         pr_debug("err %d %s\n", res, slave->dev->name);
3825                         goto unwind;
3826                 }
3827         }
3828
3829         bond_dev->mtu = new_mtu;
3830
3831         return 0;
3832
3833 unwind:
3834         /* unwind from head to the slave that failed */
3835         stop_at = slave;
3836         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3837                 int tmp_res;
3838
3839                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3840                 if (tmp_res) {
3841                         pr_debug("unwind err %d dev %s\n",
3842                                  tmp_res, slave->dev->name);
3843                 }
3844         }
3845
3846         return res;
3847 }
3848
3849 /*
3850  * Change HW address
3851  *
3852  * Note that many devices must be down to change the HW address, and
3853  * downing the master releases all slaves.  We can make bonds full of
3854  * bonding devices to test this, however.
3855  */
3856 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3857 {
3858         struct bonding *bond = netdev_priv(bond_dev);
3859         struct sockaddr *sa = addr, tmp_sa;
3860         struct slave *slave, *stop_at;
3861         int res = 0;
3862         int i;
3863
3864         if (bond->params.mode == BOND_MODE_ALB)
3865                 return bond_alb_set_mac_address(bond_dev, addr);
3866
3867
3868         pr_debug("bond=%p, name=%s\n",
3869                  bond, bond_dev ? bond_dev->name : "None");
3870
3871         /*
3872          * If fail_over_mac is set to active, do nothing and return
3873          * success.  Returning an error causes ifenslave to fail.
3874          */
3875         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3876                 return 0;
3877
3878         if (!is_valid_ether_addr(sa->sa_data))
3879                 return -EADDRNOTAVAIL;
3880
3881         /* Can't hold bond->lock with bh disabled here since
3882          * some base drivers panic. On the other hand we can't
3883          * hold bond->lock without bh disabled because we'll
3884          * deadlock. The only solution is to rely on the fact
3885          * that we're under rtnl_lock here, and the slaves
3886          * list won't change. This doesn't solve the problem
3887          * of setting the slave's hw address while it is
3888          * transmitting, but the assumption is that the base
3889          * driver can handle that.
3890          *
3891          * TODO: figure out a way to safely iterate the slaves
3892          * list, but without holding a lock around the actual
3893          * call to the base driver.
3894          */
3895
3896         bond_for_each_slave(bond, slave, i) {
3897                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3898                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3899
3900                 if (slave_ops->ndo_set_mac_address == NULL) {
3901                         res = -EOPNOTSUPP;
3902                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3903                         goto unwind;
3904                 }
3905
3906                 res = dev_set_mac_address(slave->dev, addr);
3907                 if (res) {
3908                         /* TODO: consider downing the slave
3909                          * and retry ?
3910                          * User should expect communications
3911                          * breakage anyway until ARP finish
3912                          * updating, so...
3913                          */
3914                         pr_debug("err %d %s\n", res, slave->dev->name);
3915                         goto unwind;
3916                 }
3917         }
3918
3919         /* success */
3920         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3921         return 0;
3922
3923 unwind:
3924         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3925         tmp_sa.sa_family = bond_dev->type;
3926
3927         /* unwind from head to the slave that failed */
3928         stop_at = slave;
3929         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3930                 int tmp_res;
3931
3932                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3933                 if (tmp_res) {
3934                         pr_debug("unwind err %d dev %s\n",
3935                                  tmp_res, slave->dev->name);
3936                 }
3937         }
3938
3939         return res;
3940 }
3941
3942 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3943 {
3944         struct bonding *bond = netdev_priv(bond_dev);
3945         struct slave *slave, *start_at;
3946         int i, slave_no, res = 1;
3947         struct iphdr *iph = ip_hdr(skb);
3948
3949         /*
3950          * Start with the curr_active_slave that joined the bond as the
3951          * default for sending IGMP traffic.  For failover purposes one
3952          * needs to maintain some consistency for the interface that will
3953          * send the join/membership reports.  The curr_active_slave found
3954          * will send all of this type of traffic.
3955          */
3956         if ((iph->protocol == IPPROTO_IGMP) &&
3957             (skb->protocol == htons(ETH_P_IP))) {
3958
3959                 read_lock(&bond->curr_slave_lock);
3960                 slave = bond->curr_active_slave;
3961                 read_unlock(&bond->curr_slave_lock);
3962
3963                 if (!slave)
3964                         goto out;
3965         } else {
3966                 /*
3967                  * Concurrent TX may collide on rr_tx_counter; we accept
3968                  * that as being rare enough not to justify using an
3969                  * atomic op here.
3970                  */
3971                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3972
3973                 bond_for_each_slave(bond, slave, i) {
3974                         slave_no--;
3975                         if (slave_no < 0)
3976                                 break;
3977                 }
3978         }
3979
3980         start_at = slave;
3981         bond_for_each_slave_from(bond, slave, i, start_at) {
3982                 if (IS_UP(slave->dev) &&
3983                     (slave->link == BOND_LINK_UP) &&
3984                     bond_is_active_slave(slave)) {
3985                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3986                         break;
3987                 }
3988         }
3989
3990 out:
3991         if (res) {
3992                 /* no suitable interface, frame not sent */
3993                 kfree_skb(skb);
3994         }
3995
3996         return NETDEV_TX_OK;
3997 }
3998
3999
4000 /*
4001  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4002  * the bond has a usable interface.
4003  */
4004 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4005 {
4006         struct bonding *bond = netdev_priv(bond_dev);
4007         int res = 1;
4008
4009         read_lock(&bond->curr_slave_lock);
4010
4011         if (bond->curr_active_slave)
4012                 res = bond_dev_queue_xmit(bond, skb,
4013                         bond->curr_active_slave->dev);
4014
4015         read_unlock(&bond->curr_slave_lock);
4016
4017         if (res)
4018                 /* no suitable interface, frame not sent */
4019                 kfree_skb(skb);
4020
4021         return NETDEV_TX_OK;
4022 }
4023
4024 /*
4025  * In bond_xmit_xor() , we determine the output device by using a pre-
4026  * determined xmit_hash_policy(), If the selected device is not enabled,
4027  * find the next active slave.
4028  */
4029 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4030 {
4031         struct bonding *bond = netdev_priv(bond_dev);
4032         struct slave *slave, *start_at;
4033         int slave_no;
4034         int i;
4035         int res = 1;
4036
4037         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4038
4039         bond_for_each_slave(bond, slave, i) {
4040                 slave_no--;
4041                 if (slave_no < 0)
4042                         break;
4043         }
4044
4045         start_at = slave;
4046
4047         bond_for_each_slave_from(bond, slave, i, start_at) {
4048                 if (IS_UP(slave->dev) &&
4049                     (slave->link == BOND_LINK_UP) &&
4050                     bond_is_active_slave(slave)) {
4051                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4052                         break;
4053                 }
4054         }
4055
4056         if (res) {
4057                 /* no suitable interface, frame not sent */
4058                 kfree_skb(skb);
4059         }
4060
4061         return NETDEV_TX_OK;
4062 }
4063
4064 /*
4065  * in broadcast mode, we send everything to all usable interfaces.
4066  */
4067 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4068 {
4069         struct bonding *bond = netdev_priv(bond_dev);
4070         struct slave *slave, *start_at;
4071         struct net_device *tx_dev = NULL;
4072         int i;
4073         int res = 1;
4074
4075         read_lock(&bond->curr_slave_lock);
4076         start_at = bond->curr_active_slave;
4077         read_unlock(&bond->curr_slave_lock);
4078
4079         if (!start_at)
4080                 goto out;
4081
4082         bond_for_each_slave_from(bond, slave, i, start_at) {
4083                 if (IS_UP(slave->dev) &&
4084                     (slave->link == BOND_LINK_UP) &&
4085                     bond_is_active_slave(slave)) {
4086                         if (tx_dev) {
4087                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4088                                 if (!skb2) {
4089                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4090                                                bond_dev->name);
4091                                         continue;
4092                                 }
4093
4094                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4095                                 if (res) {
4096                                         kfree_skb(skb2);
4097                                         continue;
4098                                 }
4099                         }
4100                         tx_dev = slave->dev;
4101                 }
4102         }
4103
4104         if (tx_dev)
4105                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4106
4107 out:
4108         if (res)
4109                 /* no suitable interface, frame not sent */
4110                 kfree_skb(skb);
4111
4112         /* frame sent to all suitable interfaces */
4113         return NETDEV_TX_OK;
4114 }
4115
4116 /*------------------------- Device initialization ---------------------------*/
4117
4118 static void bond_set_xmit_hash_policy(struct bonding *bond)
4119 {
4120         switch (bond->params.xmit_policy) {
4121         case BOND_XMIT_POLICY_LAYER23:
4122                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4123                 break;
4124         case BOND_XMIT_POLICY_LAYER34:
4125                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4126                 break;
4127         case BOND_XMIT_POLICY_LAYER2:
4128         default:
4129                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4130                 break;
4131         }
4132 }
4133
4134 /*
4135  * Lookup the slave that corresponds to a qid
4136  */
4137 static inline int bond_slave_override(struct bonding *bond,
4138                                       struct sk_buff *skb)
4139 {
4140         int i, res = 1;
4141         struct slave *slave = NULL;
4142         struct slave *check_slave;
4143
4144         if (!skb->queue_mapping)
4145                 return 1;
4146
4147         /* Find out if any slaves have the same mapping as this skb. */
4148         bond_for_each_slave(bond, check_slave, i) {
4149                 if (check_slave->queue_id == skb->queue_mapping) {
4150                         slave = check_slave;
4151                         break;
4152                 }
4153         }
4154
4155         /* If the slave isn't UP, use default transmit policy. */
4156         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4157             (slave->link == BOND_LINK_UP)) {
4158                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4159         }
4160
4161         return res;
4162 }
4163
4164
4165 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4166 {
4167         /*
4168          * This helper function exists to help dev_pick_tx get the correct
4169          * destination queue.  Using a helper function skips a call to
4170          * skb_tx_hash and will put the skbs in the queue we expect on their
4171          * way down to the bonding driver.
4172          */
4173         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4174
4175         /*
4176          * Save the original txq to restore before passing to the driver
4177          */
4178         qdisc_skb_cb(skb)->bond_queue_mapping = skb->queue_mapping;
4179
4180         if (unlikely(txq >= dev->real_num_tx_queues)) {
4181                 do {
4182                         txq -= dev->real_num_tx_queues;
4183                 } while (txq >= dev->real_num_tx_queues);
4184         }
4185         return txq;
4186 }
4187
4188 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4189 {
4190         struct bonding *bond = netdev_priv(dev);
4191
4192         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4193                 if (!bond_slave_override(bond, skb))
4194                         return NETDEV_TX_OK;
4195         }
4196
4197         switch (bond->params.mode) {
4198         case BOND_MODE_ROUNDROBIN:
4199                 return bond_xmit_roundrobin(skb, dev);
4200         case BOND_MODE_ACTIVEBACKUP:
4201                 return bond_xmit_activebackup(skb, dev);
4202         case BOND_MODE_XOR:
4203                 return bond_xmit_xor(skb, dev);
4204         case BOND_MODE_BROADCAST:
4205                 return bond_xmit_broadcast(skb, dev);
4206         case BOND_MODE_8023AD:
4207                 return bond_3ad_xmit_xor(skb, dev);
4208         case BOND_MODE_ALB:
4209         case BOND_MODE_TLB:
4210                 return bond_alb_xmit(skb, dev);
4211         default:
4212                 /* Should never happen, mode already checked */
4213                 pr_err("%s: Error: Unknown bonding mode %d\n",
4214                        dev->name, bond->params.mode);
4215                 WARN_ON_ONCE(1);
4216                 kfree_skb(skb);
4217                 return NETDEV_TX_OK;
4218         }
4219 }
4220
4221 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4222 {
4223         struct bonding *bond = netdev_priv(dev);
4224         netdev_tx_t ret = NETDEV_TX_OK;
4225
4226         /*
4227          * If we risk deadlock from transmitting this in the
4228          * netpoll path, tell netpoll to queue the frame for later tx
4229          */
4230         if (is_netpoll_tx_blocked(dev))
4231                 return NETDEV_TX_BUSY;
4232
4233         read_lock(&bond->lock);
4234
4235         if (bond->slave_cnt)
4236                 ret = __bond_start_xmit(skb, dev);
4237         else
4238                 kfree_skb(skb);
4239
4240         read_unlock(&bond->lock);
4241
4242         return ret;
4243 }
4244
4245 /*
4246  * set bond mode specific net device operations
4247  */
4248 void bond_set_mode_ops(struct bonding *bond, int mode)
4249 {
4250         struct net_device *bond_dev = bond->dev;
4251
4252         switch (mode) {
4253         case BOND_MODE_ROUNDROBIN:
4254                 break;
4255         case BOND_MODE_ACTIVEBACKUP:
4256                 break;
4257         case BOND_MODE_XOR:
4258                 bond_set_xmit_hash_policy(bond);
4259                 break;
4260         case BOND_MODE_BROADCAST:
4261                 break;
4262         case BOND_MODE_8023AD:
4263                 bond_set_xmit_hash_policy(bond);
4264                 break;
4265         case BOND_MODE_ALB:
4266                 /* FALLTHRU */
4267         case BOND_MODE_TLB:
4268                 break;
4269         default:
4270                 /* Should never happen, mode already checked */
4271                 pr_err("%s: Error: Unknown bonding mode %d\n",
4272                        bond_dev->name, mode);
4273                 break;
4274         }
4275 }
4276
4277 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4278                                     struct ethtool_drvinfo *drvinfo)
4279 {
4280         strncpy(drvinfo->driver, DRV_NAME, 32);
4281         strncpy(drvinfo->version, DRV_VERSION, 32);
4282         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4283 }
4284
4285 static const struct ethtool_ops bond_ethtool_ops = {
4286         .get_drvinfo            = bond_ethtool_get_drvinfo,
4287         .get_link               = ethtool_op_get_link,
4288 };
4289
4290 static const struct net_device_ops bond_netdev_ops = {
4291         .ndo_init               = bond_init,
4292         .ndo_uninit             = bond_uninit,
4293         .ndo_open               = bond_open,
4294         .ndo_stop               = bond_close,
4295         .ndo_start_xmit         = bond_start_xmit,
4296         .ndo_select_queue       = bond_select_queue,
4297         .ndo_get_stats64        = bond_get_stats,
4298         .ndo_do_ioctl           = bond_do_ioctl,
4299         .ndo_change_rx_flags    = bond_change_rx_flags,
4300         .ndo_set_rx_mode        = bond_set_multicast_list,
4301         .ndo_change_mtu         = bond_change_mtu,
4302         .ndo_set_mac_address    = bond_set_mac_address,
4303         .ndo_neigh_setup        = bond_neigh_setup,
4304         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4305         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4306 #ifdef CONFIG_NET_POLL_CONTROLLER
4307         .ndo_netpoll_setup      = bond_netpoll_setup,
4308         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4309         .ndo_poll_controller    = bond_poll_controller,
4310 #endif
4311         .ndo_add_slave          = bond_enslave,
4312         .ndo_del_slave          = bond_release,
4313         .ndo_fix_features       = bond_fix_features,
4314 };
4315
4316 static void bond_destructor(struct net_device *bond_dev)
4317 {
4318         struct bonding *bond = netdev_priv(bond_dev);
4319         if (bond->wq)
4320                 destroy_workqueue(bond->wq);
4321         free_netdev(bond_dev);
4322 }
4323
4324 static void bond_setup(struct net_device *bond_dev)
4325 {
4326         struct bonding *bond = netdev_priv(bond_dev);
4327
4328         /* initialize rwlocks */
4329         rwlock_init(&bond->lock);
4330         rwlock_init(&bond->curr_slave_lock);
4331
4332         bond->params = bonding_defaults;
4333
4334         /* Initialize pointers */
4335         bond->dev = bond_dev;
4336         INIT_LIST_HEAD(&bond->vlan_list);
4337
4338         /* Initialize the device entry points */
4339         ether_setup(bond_dev);
4340         bond_dev->netdev_ops = &bond_netdev_ops;
4341         bond_dev->ethtool_ops = &bond_ethtool_ops;
4342         bond_set_mode_ops(bond, bond->params.mode);
4343
4344         bond_dev->destructor = bond_destructor;
4345
4346         /* Initialize the device options */
4347         bond_dev->tx_queue_len = 0;
4348         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4349         bond_dev->priv_flags |= IFF_BONDING;
4350         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4351
4352         /* At first, we block adding VLANs. That's the only way to
4353          * prevent problems that occur when adding VLANs over an
4354          * empty bond. The block will be removed once non-challenged
4355          * slaves are enslaved.
4356          */
4357         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4358
4359         /* don't acquire bond device's netif_tx_lock when
4360          * transmitting */
4361         bond_dev->features |= NETIF_F_LLTX;
4362
4363         /* By default, we declare the bond to be fully
4364          * VLAN hardware accelerated capable. Special
4365          * care is taken in the various xmit functions
4366          * when there are slaves that are not hw accel
4367          * capable
4368          */
4369
4370         bond_dev->hw_features = BOND_VLAN_FEATURES |
4371                                 NETIF_F_HW_VLAN_TX |
4372                                 NETIF_F_HW_VLAN_RX |
4373                                 NETIF_F_HW_VLAN_FILTER;
4374
4375         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4376         bond_dev->features |= bond_dev->hw_features;
4377 }
4378
4379 static void bond_work_cancel_all(struct bonding *bond)
4380 {
4381         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4382                 cancel_delayed_work_sync(&bond->mii_work);
4383
4384         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4385                 cancel_delayed_work_sync(&bond->arp_work);
4386
4387         if (bond->params.mode == BOND_MODE_ALB &&
4388             delayed_work_pending(&bond->alb_work))
4389                 cancel_delayed_work_sync(&bond->alb_work);
4390
4391         if (bond->params.mode == BOND_MODE_8023AD &&
4392             delayed_work_pending(&bond->ad_work))
4393                 cancel_delayed_work_sync(&bond->ad_work);
4394
4395         if (delayed_work_pending(&bond->mcast_work))
4396                 cancel_delayed_work_sync(&bond->mcast_work);
4397 }
4398
4399 /*
4400 * Destroy a bonding device.
4401 * Must be under rtnl_lock when this function is called.
4402 */
4403 static void bond_uninit(struct net_device *bond_dev)
4404 {
4405         struct bonding *bond = netdev_priv(bond_dev);
4406         struct vlan_entry *vlan, *tmp;
4407
4408         bond_netpoll_cleanup(bond_dev);
4409
4410         /* Release the bonded slaves */
4411         bond_release_all(bond_dev);
4412
4413         list_del(&bond->bond_list);
4414
4415         bond_work_cancel_all(bond);
4416
4417         bond_remove_proc_entry(bond);
4418
4419         bond_debug_unregister(bond);
4420
4421         __hw_addr_flush(&bond->mc_list);
4422
4423         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4424                 list_del(&vlan->vlan_list);
4425                 kfree(vlan);
4426         }
4427 }
4428
4429 /*------------------------- Module initialization ---------------------------*/
4430
4431 /*
4432  * Convert string input module parms.  Accept either the
4433  * number of the mode or its string name.  A bit complicated because
4434  * some mode names are substrings of other names, and calls from sysfs
4435  * may have whitespace in the name (trailing newlines, for example).
4436  */
4437 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4438 {
4439         int modeint = -1, i, rv;
4440         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4441
4442         for (p = (char *)buf; *p; p++)
4443                 if (!(isdigit(*p) || isspace(*p)))
4444                         break;
4445
4446         if (*p)
4447                 rv = sscanf(buf, "%20s", modestr);
4448         else
4449                 rv = sscanf(buf, "%d", &modeint);
4450
4451         if (!rv)
4452                 return -1;
4453
4454         for (i = 0; tbl[i].modename; i++) {
4455                 if (modeint == tbl[i].mode)
4456                         return tbl[i].mode;
4457                 if (strcmp(modestr, tbl[i].modename) == 0)
4458                         return tbl[i].mode;
4459         }
4460
4461         return -1;
4462 }
4463
4464 static int bond_check_params(struct bond_params *params)
4465 {
4466         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4467
4468         /*
4469          * Convert string parameters.
4470          */
4471         if (mode) {
4472                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4473                 if (bond_mode == -1) {
4474                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4475                                mode == NULL ? "NULL" : mode);
4476                         return -EINVAL;
4477                 }
4478         }
4479
4480         if (xmit_hash_policy) {
4481                 if ((bond_mode != BOND_MODE_XOR) &&
4482                     (bond_mode != BOND_MODE_8023AD)) {
4483                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4484                                bond_mode_name(bond_mode));
4485                 } else {
4486                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4487                                                         xmit_hashtype_tbl);
4488                         if (xmit_hashtype == -1) {
4489                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4490                                        xmit_hash_policy == NULL ? "NULL" :
4491                                        xmit_hash_policy);
4492                                 return -EINVAL;
4493                         }
4494                 }
4495         }
4496
4497         if (lacp_rate) {
4498                 if (bond_mode != BOND_MODE_8023AD) {
4499                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4500                                 bond_mode_name(bond_mode));
4501                 } else {
4502                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4503                         if (lacp_fast == -1) {
4504                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4505                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4506                                 return -EINVAL;
4507                         }
4508                 }
4509         }
4510
4511         if (ad_select) {
4512                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4513                 if (params->ad_select == -1) {
4514                         pr_err("Error: Invalid ad_select \"%s\"\n",
4515                                ad_select == NULL ? "NULL" : ad_select);
4516                         return -EINVAL;
4517                 }
4518
4519                 if (bond_mode != BOND_MODE_8023AD) {
4520                         pr_warning("ad_select param only affects 802.3ad mode\n");
4521                 }
4522         } else {
4523                 params->ad_select = BOND_AD_STABLE;
4524         }
4525
4526         if (max_bonds < 0) {
4527                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4528                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4529                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4530         }
4531
4532         if (miimon < 0) {
4533                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4534                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4535                 miimon = BOND_LINK_MON_INTERV;
4536         }
4537
4538         if (updelay < 0) {
4539                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4540                            updelay, INT_MAX);
4541                 updelay = 0;
4542         }
4543
4544         if (downdelay < 0) {
4545                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4546                            downdelay, INT_MAX);
4547                 downdelay = 0;
4548         }
4549
4550         if ((use_carrier != 0) && (use_carrier != 1)) {
4551                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4552                            use_carrier);
4553                 use_carrier = 1;
4554         }
4555
4556         if (num_peer_notif < 0 || num_peer_notif > 255) {
4557                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4558                            num_peer_notif);
4559                 num_peer_notif = 1;
4560         }
4561
4562         /* reset values for 802.3ad */
4563         if (bond_mode == BOND_MODE_8023AD) {
4564                 if (!miimon) {
4565                         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");
4566                         pr_warning("Forcing miimon to 100msec\n");
4567                         miimon = 100;
4568                 }
4569         }
4570
4571         if (tx_queues < 1 || tx_queues > 255) {
4572                 pr_warning("Warning: tx_queues (%d) should be between "
4573                            "1 and 255, resetting to %d\n",
4574                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4575                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4576         }
4577
4578         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4579                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4580                            "not of valid value (0/1), so it was set to "
4581                            "0\n", all_slaves_active);
4582                 all_slaves_active = 0;
4583         }
4584
4585         if (resend_igmp < 0 || resend_igmp > 255) {
4586                 pr_warning("Warning: resend_igmp (%d) should be between "
4587                            "0 and 255, resetting to %d\n",
4588                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4589                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4590         }
4591
4592         /* reset values for TLB/ALB */
4593         if ((bond_mode == BOND_MODE_TLB) ||
4594             (bond_mode == BOND_MODE_ALB)) {
4595                 if (!miimon) {
4596                         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");
4597                         pr_warning("Forcing miimon to 100msec\n");
4598                         miimon = 100;
4599                 }
4600         }
4601
4602         if (bond_mode == BOND_MODE_ALB) {
4603                 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",
4604                           updelay);
4605         }
4606
4607         if (!miimon) {
4608                 if (updelay || downdelay) {
4609                         /* just warn the user the up/down delay will have
4610                          * no effect since miimon is zero...
4611                          */
4612                         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",
4613                                    updelay, downdelay);
4614                 }
4615         } else {
4616                 /* don't allow arp monitoring */
4617                 if (arp_interval) {
4618                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4619                                    miimon, arp_interval);
4620                         arp_interval = 0;
4621                 }
4622
4623                 if ((updelay % miimon) != 0) {
4624                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4625                                    updelay, miimon,
4626                                    (updelay / miimon) * miimon);
4627                 }
4628
4629                 updelay /= miimon;
4630
4631                 if ((downdelay % miimon) != 0) {
4632                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4633                                    downdelay, miimon,
4634                                    (downdelay / miimon) * miimon);
4635                 }
4636
4637                 downdelay /= miimon;
4638         }
4639
4640         if (arp_interval < 0) {
4641                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4642                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4643                 arp_interval = BOND_LINK_ARP_INTERV;
4644         }
4645
4646         for (arp_ip_count = 0;
4647              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4648              arp_ip_count++) {
4649                 /* not complete check, but should be good enough to
4650                    catch mistakes */
4651                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4652                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4653                                    arp_ip_target[arp_ip_count]);
4654                         arp_interval = 0;
4655                 } else {
4656                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4657                         arp_target[arp_ip_count] = ip;
4658                 }
4659         }
4660
4661         if (arp_interval && !arp_ip_count) {
4662                 /* don't allow arping if no arp_ip_target given... */
4663                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4664                            arp_interval);
4665                 arp_interval = 0;
4666         }
4667
4668         if (arp_validate) {
4669                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4670                         pr_err("arp_validate only supported in active-backup mode\n");
4671                         return -EINVAL;
4672                 }
4673                 if (!arp_interval) {
4674                         pr_err("arp_validate requires arp_interval\n");
4675                         return -EINVAL;
4676                 }
4677
4678                 arp_validate_value = bond_parse_parm(arp_validate,
4679                                                      arp_validate_tbl);
4680                 if (arp_validate_value == -1) {
4681                         pr_err("Error: invalid arp_validate \"%s\"\n",
4682                                arp_validate == NULL ? "NULL" : arp_validate);
4683                         return -EINVAL;
4684                 }
4685         } else
4686                 arp_validate_value = 0;
4687
4688         if (miimon) {
4689                 pr_info("MII link monitoring set to %d ms\n", miimon);
4690         } else if (arp_interval) {
4691                 int i;
4692
4693                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4694                         arp_interval,
4695                         arp_validate_tbl[arp_validate_value].modename,
4696                         arp_ip_count);
4697
4698                 for (i = 0; i < arp_ip_count; i++)
4699                         pr_info(" %s", arp_ip_target[i]);
4700
4701                 pr_info("\n");
4702
4703         } else if (max_bonds) {
4704                 /* miimon and arp_interval not set, we need one so things
4705                  * work as expected, see bonding.txt for details
4706                  */
4707                 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");
4708         }
4709
4710         if (primary && !USES_PRIMARY(bond_mode)) {
4711                 /* currently, using a primary only makes sense
4712                  * in active backup, TLB or ALB modes
4713                  */
4714                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4715                            primary, bond_mode_name(bond_mode));
4716                 primary = NULL;
4717         }
4718
4719         if (primary && primary_reselect) {
4720                 primary_reselect_value = bond_parse_parm(primary_reselect,
4721                                                          pri_reselect_tbl);
4722                 if (primary_reselect_value == -1) {
4723                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4724                                primary_reselect ==
4725                                         NULL ? "NULL" : primary_reselect);
4726                         return -EINVAL;
4727                 }
4728         } else {
4729                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4730         }
4731
4732         if (fail_over_mac) {
4733                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4734                                                       fail_over_mac_tbl);
4735                 if (fail_over_mac_value == -1) {
4736                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4737                                arp_validate == NULL ? "NULL" : arp_validate);
4738                         return -EINVAL;
4739                 }
4740
4741                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4742                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4743         } else {
4744                 fail_over_mac_value = BOND_FOM_NONE;
4745         }
4746
4747         /* fill params struct with the proper values */
4748         params->mode = bond_mode;
4749         params->xmit_policy = xmit_hashtype;
4750         params->miimon = miimon;
4751         params->num_peer_notif = num_peer_notif;
4752         params->arp_interval = arp_interval;
4753         params->arp_validate = arp_validate_value;
4754         params->updelay = updelay;
4755         params->downdelay = downdelay;
4756         params->use_carrier = use_carrier;
4757         params->lacp_fast = lacp_fast;
4758         params->primary[0] = 0;
4759         params->primary_reselect = primary_reselect_value;
4760         params->fail_over_mac = fail_over_mac_value;
4761         params->tx_queues = tx_queues;
4762         params->all_slaves_active = all_slaves_active;
4763         params->resend_igmp = resend_igmp;
4764         params->min_links = min_links;
4765
4766         if (primary) {
4767                 strncpy(params->primary, primary, IFNAMSIZ);
4768                 params->primary[IFNAMSIZ - 1] = 0;
4769         }
4770
4771         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4772
4773         return 0;
4774 }
4775
4776 static struct lock_class_key bonding_netdev_xmit_lock_key;
4777 static struct lock_class_key bonding_netdev_addr_lock_key;
4778
4779 static void bond_set_lockdep_class_one(struct net_device *dev,
4780                                        struct netdev_queue *txq,
4781                                        void *_unused)
4782 {
4783         lockdep_set_class(&txq->_xmit_lock,
4784                           &bonding_netdev_xmit_lock_key);
4785 }
4786
4787 static void bond_set_lockdep_class(struct net_device *dev)
4788 {
4789         lockdep_set_class(&dev->addr_list_lock,
4790                           &bonding_netdev_addr_lock_key);
4791         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4792 }
4793
4794 /*
4795  * Called from registration process
4796  */
4797 static int bond_init(struct net_device *bond_dev)
4798 {
4799         struct bonding *bond = netdev_priv(bond_dev);
4800         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4801         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4802
4803         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4804
4805         /*
4806          * Initialize locks that may be required during
4807          * en/deslave operations.  All of the bond_open work
4808          * (of which this is part) should really be moved to
4809          * a phase prior to dev_open
4810          */
4811         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4812         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4813
4814         bond->wq = create_singlethread_workqueue(bond_dev->name);
4815         if (!bond->wq)
4816                 return -ENOMEM;
4817
4818         bond_set_lockdep_class(bond_dev);
4819
4820         bond_create_proc_entry(bond);
4821         list_add_tail(&bond->bond_list, &bn->dev_list);
4822
4823         bond_prepare_sysfs_group(bond);
4824
4825         bond_debug_register(bond);
4826
4827         __hw_addr_init(&bond->mc_list);
4828         return 0;
4829 }
4830
4831 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4832 {
4833         if (tb[IFLA_ADDRESS]) {
4834                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4835                         return -EINVAL;
4836                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4837                         return -EADDRNOTAVAIL;
4838         }
4839         return 0;
4840 }
4841
4842 static int bond_get_tx_queues(struct net *net, struct nlattr *tb[])
4843 {
4844         return tx_queues;
4845 }
4846
4847 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4848         .kind           = "bond",
4849         .priv_size      = sizeof(struct bonding),
4850         .setup          = bond_setup,
4851         .validate       = bond_validate,
4852         .get_tx_queues  = bond_get_tx_queues,
4853 };
4854
4855 /* Create a new bond based on the specified name and bonding parameters.
4856  * If name is NULL, obtain a suitable "bond%d" name for us.
4857  * Caller must NOT hold rtnl_lock; we need to release it here before we
4858  * set up our sysfs entries.
4859  */
4860 int bond_create(struct net *net, const char *name)
4861 {
4862         struct net_device *bond_dev;
4863         int res;
4864
4865         rtnl_lock();
4866
4867         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4868                                    name ? name : "bond%d",
4869                                    bond_setup, tx_queues);
4870         if (!bond_dev) {
4871                 pr_err("%s: eek! can't alloc netdev!\n", name);
4872                 rtnl_unlock();
4873                 return -ENOMEM;
4874         }
4875
4876         dev_net_set(bond_dev, net);
4877         bond_dev->rtnl_link_ops = &bond_link_ops;
4878
4879         res = register_netdevice(bond_dev);
4880
4881         netif_carrier_off(bond_dev);
4882
4883         rtnl_unlock();
4884         if (res < 0)
4885                 bond_destructor(bond_dev);
4886         return res;
4887 }
4888
4889 static int __net_init bond_net_init(struct net *net)
4890 {
4891         struct bond_net *bn = net_generic(net, bond_net_id);
4892
4893         bn->net = net;
4894         INIT_LIST_HEAD(&bn->dev_list);
4895
4896         bond_create_proc_dir(bn);
4897         bond_create_sysfs(bn);
4898
4899         return 0;
4900 }
4901
4902 static void __net_exit bond_net_exit(struct net *net)
4903 {
4904         struct bond_net *bn = net_generic(net, bond_net_id);
4905
4906         bond_destroy_sysfs(bn);
4907         bond_destroy_proc_dir(bn);
4908 }
4909
4910 static struct pernet_operations bond_net_ops = {
4911         .init = bond_net_init,
4912         .exit = bond_net_exit,
4913         .id   = &bond_net_id,
4914         .size = sizeof(struct bond_net),
4915 };
4916
4917 static int __init bonding_init(void)
4918 {
4919         int i;
4920         int res;
4921
4922         pr_info("%s", bond_version);
4923
4924         res = bond_check_params(&bonding_defaults);
4925         if (res)
4926                 goto out;
4927
4928         res = register_pernet_subsys(&bond_net_ops);
4929         if (res)
4930                 goto out;
4931
4932         res = rtnl_link_register(&bond_link_ops);
4933         if (res)
4934                 goto err_link;
4935
4936         bond_create_debugfs();
4937
4938         for (i = 0; i < max_bonds; i++) {
4939                 res = bond_create(&init_net, NULL);
4940                 if (res)
4941                         goto err;
4942         }
4943
4944         register_netdevice_notifier(&bond_netdev_notifier);
4945 out:
4946         return res;
4947 err:
4948         rtnl_link_unregister(&bond_link_ops);
4949 err_link:
4950         unregister_pernet_subsys(&bond_net_ops);
4951         goto out;
4952
4953 }
4954
4955 static void __exit bonding_exit(void)
4956 {
4957         unregister_netdevice_notifier(&bond_netdev_notifier);
4958
4959         bond_destroy_debugfs();
4960
4961         rtnl_link_unregister(&bond_link_ops);
4962         unregister_pernet_subsys(&bond_net_ops);
4963
4964 #ifdef CONFIG_NET_POLL_CONTROLLER
4965         /*
4966          * Make sure we don't have an imbalance on our netpoll blocking
4967          */
4968         WARN_ON(atomic_read(&netpoll_block_tx));
4969 #endif
4970 }
4971
4972 module_init(bonding_init);
4973 module_exit(bonding_exit);
4974 MODULE_LICENSE("GPL");
4975 MODULE_VERSION(DRV_VERSION);
4976 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4977 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4978 MODULE_ALIAS_RTNL_LINK("bond");