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