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 __be32 bond_glean_dev_ip(struct net_device *dev)
2557 {
2558         struct in_device *idev;
2559         struct in_ifaddr *ifa;
2560         __be32 addr = 0;
2561
2562         if (!dev)
2563                 return 0;
2564
2565         rcu_read_lock();
2566         idev = __in_dev_get_rcu(dev);
2567         if (!idev)
2568                 goto out;
2569
2570         ifa = idev->ifa_list;
2571         if (!ifa)
2572                 goto out;
2573
2574         addr = ifa->ifa_local;
2575 out:
2576         rcu_read_unlock();
2577         return addr;
2578 }
2579
2580 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2581 {
2582         struct vlan_entry *vlan;
2583
2584         if (ip == bond->master_ip)
2585                 return 1;
2586
2587         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2588                 if (ip == vlan->vlan_ip)
2589                         return 1;
2590         }
2591
2592         return 0;
2593 }
2594
2595 /*
2596  * We go to the (large) trouble of VLAN tagging ARP frames because
2597  * switches in VLAN mode (especially if ports are configured as
2598  * "native" to a VLAN) might not pass non-tagged frames.
2599  */
2600 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2601 {
2602         struct sk_buff *skb;
2603
2604         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2605                  slave_dev->name, dest_ip, src_ip, vlan_id);
2606
2607         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2608                          NULL, slave_dev->dev_addr, NULL);
2609
2610         if (!skb) {
2611                 pr_err("ARP packet allocation failed\n");
2612                 return;
2613         }
2614         if (vlan_id) {
2615                 skb = vlan_put_tag(skb, vlan_id);
2616                 if (!skb) {
2617                         pr_err("failed to insert VLAN tag\n");
2618                         return;
2619                 }
2620         }
2621         arp_xmit(skb);
2622 }
2623
2624
2625 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2626 {
2627         int i, vlan_id;
2628         __be32 *targets = bond->params.arp_targets;
2629         struct vlan_entry *vlan;
2630         struct net_device *vlan_dev;
2631         struct rtable *rt;
2632
2633         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2634                 if (!targets[i])
2635                         break;
2636                 pr_debug("basa: target %x\n", targets[i]);
2637                 if (!bond_vlan_used(bond)) {
2638                         pr_debug("basa: empty vlan: arp_send\n");
2639                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2640                                       bond->master_ip, 0);
2641                         continue;
2642                 }
2643
2644                 /*
2645                  * If VLANs are configured, we do a route lookup to
2646                  * determine which VLAN interface would be used, so we
2647                  * can tag the ARP with the proper VLAN tag.
2648                  */
2649                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2650                                      RTO_ONLINK, 0);
2651                 if (IS_ERR(rt)) {
2652                         if (net_ratelimit()) {
2653                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2654                                            bond->dev->name, &targets[i]);
2655                         }
2656                         continue;
2657                 }
2658
2659                 /*
2660                  * This target is not on a VLAN
2661                  */
2662                 if (rt->dst.dev == bond->dev) {
2663                         ip_rt_put(rt);
2664                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2665                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2666                                       bond->master_ip, 0);
2667                         continue;
2668                 }
2669
2670                 vlan_id = 0;
2671                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2672                         rcu_read_lock();
2673                         vlan_dev = __vlan_find_dev_deep(bond->dev,
2674                                                         vlan->vlan_id);
2675                         rcu_read_unlock();
2676                         if (vlan_dev == rt->dst.dev) {
2677                                 vlan_id = vlan->vlan_id;
2678                                 pr_debug("basa: vlan match on %s %d\n",
2679                                        vlan_dev->name, vlan_id);
2680                                 break;
2681                         }
2682                 }
2683
2684                 if (vlan_id) {
2685                         ip_rt_put(rt);
2686                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2687                                       vlan->vlan_ip, vlan_id);
2688                         continue;
2689                 }
2690
2691                 if (net_ratelimit()) {
2692                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2693                                    bond->dev->name, &targets[i],
2694                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2695                 }
2696                 ip_rt_put(rt);
2697         }
2698 }
2699
2700 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2701 {
2702         int i;
2703         __be32 *targets = bond->params.arp_targets;
2704
2705         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2706                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2707                          &sip, &tip, i, &targets[i],
2708                          bond_has_this_ip(bond, tip));
2709                 if (sip == targets[i]) {
2710                         if (bond_has_this_ip(bond, tip))
2711                                 slave->last_arp_rx = jiffies;
2712                         return;
2713                 }
2714         }
2715 }
2716
2717 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,
2718                          struct slave *slave)
2719 {
2720         struct arphdr *arp;
2721         unsigned char *arp_ptr;
2722         __be32 sip, tip;
2723
2724         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2725                 return;
2726
2727         read_lock(&bond->lock);
2728
2729         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2730                  bond->dev->name, skb->dev->name);
2731
2732         if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
2733                 goto out_unlock;
2734
2735         arp = arp_hdr(skb);
2736         if (arp->ar_hln != bond->dev->addr_len ||
2737             skb->pkt_type == PACKET_OTHERHOST ||
2738             skb->pkt_type == PACKET_LOOPBACK ||
2739             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2740             arp->ar_pro != htons(ETH_P_IP) ||
2741             arp->ar_pln != 4)
2742                 goto out_unlock;
2743
2744         arp_ptr = (unsigned char *)(arp + 1);
2745         arp_ptr += bond->dev->addr_len;
2746         memcpy(&sip, arp_ptr, 4);
2747         arp_ptr += 4 + bond->dev->addr_len;
2748         memcpy(&tip, arp_ptr, 4);
2749
2750         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2751                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2752                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2753                  &sip, &tip);
2754
2755         /*
2756          * Backup slaves won't see the ARP reply, but do come through
2757          * here for each ARP probe (so we swap the sip/tip to validate
2758          * the probe).  In a "redundant switch, common router" type of
2759          * configuration, the ARP probe will (hopefully) travel from
2760          * the active, through one switch, the router, then the other
2761          * switch before reaching the backup.
2762          */
2763         if (bond_is_active_slave(slave))
2764                 bond_validate_arp(bond, slave, sip, tip);
2765         else
2766                 bond_validate_arp(bond, slave, tip, sip);
2767
2768 out_unlock:
2769         read_unlock(&bond->lock);
2770 }
2771
2772 /*
2773  * this function is called regularly to monitor each slave's link
2774  * ensuring that traffic is being sent and received when arp monitoring
2775  * is used in load-balancing mode. if the adapter has been dormant, then an
2776  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2777  * arp monitoring in active backup mode.
2778  */
2779 void bond_loadbalance_arp_mon(struct work_struct *work)
2780 {
2781         struct bonding *bond = container_of(work, struct bonding,
2782                                             arp_work.work);
2783         struct slave *slave, *oldcurrent;
2784         int do_failover = 0;
2785         int delta_in_ticks;
2786         int i;
2787
2788         read_lock(&bond->lock);
2789
2790         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2791
2792         if (bond->slave_cnt == 0)
2793                 goto re_arm;
2794
2795         read_lock(&bond->curr_slave_lock);
2796         oldcurrent = bond->curr_active_slave;
2797         read_unlock(&bond->curr_slave_lock);
2798
2799         /* see if any of the previous devices are up now (i.e. they have
2800          * xmt and rcv traffic). the curr_active_slave does not come into
2801          * the picture unless it is null. also, slave->jiffies is not needed
2802          * here because we send an arp on each slave and give a slave as
2803          * long as it needs to get the tx/rx within the delta.
2804          * TODO: what about up/down delay in arp mode? it wasn't here before
2805          *       so it can wait
2806          */
2807         bond_for_each_slave(bond, slave, i) {
2808                 unsigned long trans_start = dev_trans_start(slave->dev);
2809
2810                 if (slave->link != BOND_LINK_UP) {
2811                         if (time_in_range(jiffies,
2812                                 trans_start - delta_in_ticks,
2813                                 trans_start + delta_in_ticks) &&
2814                             time_in_range(jiffies,
2815                                 slave->dev->last_rx - delta_in_ticks,
2816                                 slave->dev->last_rx + delta_in_ticks)) {
2817
2818                                 slave->link  = BOND_LINK_UP;
2819                                 bond_set_active_slave(slave);
2820
2821                                 /* primary_slave has no meaning in round-robin
2822                                  * mode. the window of a slave being up and
2823                                  * curr_active_slave being null after enslaving
2824                                  * is closed.
2825                                  */
2826                                 if (!oldcurrent) {
2827                                         pr_info("%s: link status definitely up for interface %s, ",
2828                                                 bond->dev->name,
2829                                                 slave->dev->name);
2830                                         do_failover = 1;
2831                                 } else {
2832                                         pr_info("%s: interface %s is now up\n",
2833                                                 bond->dev->name,
2834                                                 slave->dev->name);
2835                                 }
2836                         }
2837                 } else {
2838                         /* slave->link == BOND_LINK_UP */
2839
2840                         /* not all switches will respond to an arp request
2841                          * when the source ip is 0, so don't take the link down
2842                          * if we don't know our ip yet
2843                          */
2844                         if (!time_in_range(jiffies,
2845                                 trans_start - delta_in_ticks,
2846                                 trans_start + 2 * delta_in_ticks) ||
2847                             !time_in_range(jiffies,
2848                                 slave->dev->last_rx - delta_in_ticks,
2849                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2850
2851                                 slave->link  = BOND_LINK_DOWN;
2852                                 bond_set_backup_slave(slave);
2853
2854                                 if (slave->link_failure_count < UINT_MAX)
2855                                         slave->link_failure_count++;
2856
2857                                 pr_info("%s: interface %s is now down.\n",
2858                                         bond->dev->name,
2859                                         slave->dev->name);
2860
2861                                 if (slave == oldcurrent)
2862                                         do_failover = 1;
2863                         }
2864                 }
2865
2866                 /* note: if switch is in round-robin mode, all links
2867                  * must tx arp to ensure all links rx an arp - otherwise
2868                  * links may oscillate or not come up at all; if switch is
2869                  * in something like xor mode, there is nothing we can
2870                  * do - all replies will be rx'ed on same link causing slaves
2871                  * to be unstable during low/no traffic periods
2872                  */
2873                 if (IS_UP(slave->dev))
2874                         bond_arp_send_all(bond, slave);
2875         }
2876
2877         if (do_failover) {
2878                 block_netpoll_tx();
2879                 write_lock_bh(&bond->curr_slave_lock);
2880
2881                 bond_select_active_slave(bond);
2882
2883                 write_unlock_bh(&bond->curr_slave_lock);
2884                 unblock_netpoll_tx();
2885         }
2886
2887 re_arm:
2888         if (bond->params.arp_interval)
2889                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2890
2891         read_unlock(&bond->lock);
2892 }
2893
2894 /*
2895  * Called to inspect slaves for active-backup mode ARP monitor link state
2896  * changes.  Sets new_link in slaves to specify what action should take
2897  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2898  * to link states must be committed.
2899  *
2900  * Called with bond->lock held for read.
2901  */
2902 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2903 {
2904         struct slave *slave;
2905         int i, commit = 0;
2906         unsigned long trans_start;
2907
2908         bond_for_each_slave(bond, slave, i) {
2909                 slave->new_link = BOND_LINK_NOCHANGE;
2910
2911                 if (slave->link != BOND_LINK_UP) {
2912                         if (time_in_range(jiffies,
2913                                 slave_last_rx(bond, slave) - delta_in_ticks,
2914                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2915
2916                                 slave->new_link = BOND_LINK_UP;
2917                                 commit++;
2918                         }
2919
2920                         continue;
2921                 }
2922
2923                 /*
2924                  * Give slaves 2*delta after being enslaved or made
2925                  * active.  This avoids bouncing, as the last receive
2926                  * times need a full ARP monitor cycle to be updated.
2927                  */
2928                 if (time_in_range(jiffies,
2929                                   slave->jiffies - delta_in_ticks,
2930                                   slave->jiffies + 2 * delta_in_ticks))
2931                         continue;
2932
2933                 /*
2934                  * Backup slave is down if:
2935                  * - No current_arp_slave AND
2936                  * - more than 3*delta since last receive AND
2937                  * - the bond has an IP address
2938                  *
2939                  * Note: a non-null current_arp_slave indicates
2940                  * the curr_active_slave went down and we are
2941                  * searching for a new one; under this condition
2942                  * we only take the curr_active_slave down - this
2943                  * gives each slave a chance to tx/rx traffic
2944                  * before being taken out
2945                  */
2946                 if (!bond_is_active_slave(slave) &&
2947                     !bond->current_arp_slave &&
2948                     !time_in_range(jiffies,
2949                         slave_last_rx(bond, slave) - delta_in_ticks,
2950                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2951
2952                         slave->new_link = BOND_LINK_DOWN;
2953                         commit++;
2954                 }
2955
2956                 /*
2957                  * Active slave is down if:
2958                  * - more than 2*delta since transmitting OR
2959                  * - (more than 2*delta since receive AND
2960                  *    the bond has an IP address)
2961                  */
2962                 trans_start = dev_trans_start(slave->dev);
2963                 if (bond_is_active_slave(slave) &&
2964                     (!time_in_range(jiffies,
2965                         trans_start - delta_in_ticks,
2966                         trans_start + 2 * delta_in_ticks) ||
2967                      !time_in_range(jiffies,
2968                         slave_last_rx(bond, slave) - delta_in_ticks,
2969                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2970
2971                         slave->new_link = BOND_LINK_DOWN;
2972                         commit++;
2973                 }
2974         }
2975
2976         return commit;
2977 }
2978
2979 /*
2980  * Called to commit link state changes noted by inspection step of
2981  * active-backup mode ARP monitor.
2982  *
2983  * Called with RTNL and bond->lock for read.
2984  */
2985 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2986 {
2987         struct slave *slave;
2988         int i;
2989         unsigned long trans_start;
2990
2991         bond_for_each_slave(bond, slave, i) {
2992                 switch (slave->new_link) {
2993                 case BOND_LINK_NOCHANGE:
2994                         continue;
2995
2996                 case BOND_LINK_UP:
2997                         trans_start = dev_trans_start(slave->dev);
2998                         if ((!bond->curr_active_slave &&
2999                              time_in_range(jiffies,
3000                                            trans_start - delta_in_ticks,
3001                                            trans_start + delta_in_ticks)) ||
3002                             bond->curr_active_slave != slave) {
3003                                 slave->link = BOND_LINK_UP;
3004                                 bond->current_arp_slave = NULL;
3005
3006                                 pr_info("%s: link status definitely up for interface %s.\n",
3007                                         bond->dev->name, slave->dev->name);
3008
3009                                 if (!bond->curr_active_slave ||
3010                                     (slave == bond->primary_slave))
3011                                         goto do_failover;
3012
3013                         }
3014
3015                         continue;
3016
3017                 case BOND_LINK_DOWN:
3018                         if (slave->link_failure_count < UINT_MAX)
3019                                 slave->link_failure_count++;
3020
3021                         slave->link = BOND_LINK_DOWN;
3022                         bond_set_slave_inactive_flags(slave);
3023
3024                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3025                                 bond->dev->name, slave->dev->name);
3026
3027                         if (slave == bond->curr_active_slave) {
3028                                 bond->current_arp_slave = NULL;
3029                                 goto do_failover;
3030                         }
3031
3032                         continue;
3033
3034                 default:
3035                         pr_err("%s: impossible: new_link %d on slave %s\n",
3036                                bond->dev->name, slave->new_link,
3037                                slave->dev->name);
3038                         continue;
3039                 }
3040
3041 do_failover:
3042                 ASSERT_RTNL();
3043                 block_netpoll_tx();
3044                 write_lock_bh(&bond->curr_slave_lock);
3045                 bond_select_active_slave(bond);
3046                 write_unlock_bh(&bond->curr_slave_lock);
3047                 unblock_netpoll_tx();
3048         }
3049
3050         bond_set_carrier(bond);
3051 }
3052
3053 /*
3054  * Send ARP probes for active-backup mode ARP monitor.
3055  *
3056  * Called with bond->lock held for read.
3057  */
3058 static void bond_ab_arp_probe(struct bonding *bond)
3059 {
3060         struct slave *slave;
3061         int i;
3062
3063         read_lock(&bond->curr_slave_lock);
3064
3065         if (bond->current_arp_slave && bond->curr_active_slave)
3066                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3067                         bond->current_arp_slave->dev->name,
3068                         bond->curr_active_slave->dev->name);
3069
3070         if (bond->curr_active_slave) {
3071                 bond_arp_send_all(bond, bond->curr_active_slave);
3072                 read_unlock(&bond->curr_slave_lock);
3073                 return;
3074         }
3075
3076         read_unlock(&bond->curr_slave_lock);
3077
3078         /* if we don't have a curr_active_slave, search for the next available
3079          * backup slave from the current_arp_slave and make it the candidate
3080          * for becoming the curr_active_slave
3081          */
3082
3083         if (!bond->current_arp_slave) {
3084                 bond->current_arp_slave = bond->first_slave;
3085                 if (!bond->current_arp_slave)
3086                         return;
3087         }
3088
3089         bond_set_slave_inactive_flags(bond->current_arp_slave);
3090
3091         /* search for next candidate */
3092         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3093                 if (IS_UP(slave->dev)) {
3094                         slave->link = BOND_LINK_BACK;
3095                         bond_set_slave_active_flags(slave);
3096                         bond_arp_send_all(bond, slave);
3097                         slave->jiffies = jiffies;
3098                         bond->current_arp_slave = slave;
3099                         break;
3100                 }
3101
3102                 /* if the link state is up at this point, we
3103                  * mark it down - this can happen if we have
3104                  * simultaneous link failures and
3105                  * reselect_active_interface doesn't make this
3106                  * one the current slave so it is still marked
3107                  * up when it is actually down
3108                  */
3109                 if (slave->link == BOND_LINK_UP) {
3110                         slave->link = BOND_LINK_DOWN;
3111                         if (slave->link_failure_count < UINT_MAX)
3112                                 slave->link_failure_count++;
3113
3114                         bond_set_slave_inactive_flags(slave);
3115
3116                         pr_info("%s: backup interface %s is now down.\n",
3117                                 bond->dev->name, slave->dev->name);
3118                 }
3119         }
3120 }
3121
3122 void bond_activebackup_arp_mon(struct work_struct *work)
3123 {
3124         struct bonding *bond = container_of(work, struct bonding,
3125                                             arp_work.work);
3126         bool should_notify_peers = false;
3127         int delta_in_ticks;
3128
3129         read_lock(&bond->lock);
3130
3131         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3132
3133         if (bond->slave_cnt == 0)
3134                 goto re_arm;
3135
3136         should_notify_peers = bond_should_notify_peers(bond);
3137
3138         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3139                 read_unlock(&bond->lock);
3140
3141                 /* Race avoidance with bond_close flush of workqueue */
3142                 if (!rtnl_trylock()) {
3143                         read_lock(&bond->lock);
3144                         delta_in_ticks = 1;
3145                         should_notify_peers = false;
3146                         goto re_arm;
3147                 }
3148
3149                 read_lock(&bond->lock);
3150
3151                 bond_ab_arp_commit(bond, delta_in_ticks);
3152
3153                 read_unlock(&bond->lock);
3154                 rtnl_unlock();
3155                 read_lock(&bond->lock);
3156         }
3157
3158         bond_ab_arp_probe(bond);
3159
3160 re_arm:
3161         if (bond->params.arp_interval)
3162                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3163
3164         read_unlock(&bond->lock);
3165
3166         if (should_notify_peers) {
3167                 if (!rtnl_trylock()) {
3168                         read_lock(&bond->lock);
3169                         bond->send_peer_notif++;
3170                         read_unlock(&bond->lock);
3171                         return;
3172                 }
3173                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
3174                 rtnl_unlock();
3175         }
3176 }
3177
3178 /*-------------------------- netdev event handling --------------------------*/
3179
3180 /*
3181  * Change device name
3182  */
3183 static int bond_event_changename(struct bonding *bond)
3184 {
3185         bond_remove_proc_entry(bond);
3186         bond_create_proc_entry(bond);
3187
3188         bond_debug_reregister(bond);
3189
3190         return NOTIFY_DONE;
3191 }
3192
3193 static int bond_master_netdev_event(unsigned long event,
3194                                     struct net_device *bond_dev)
3195 {
3196         struct bonding *event_bond = netdev_priv(bond_dev);
3197
3198         switch (event) {
3199         case NETDEV_CHANGENAME:
3200                 return bond_event_changename(event_bond);
3201         default:
3202                 break;
3203         }
3204
3205         return NOTIFY_DONE;
3206 }
3207
3208 static int bond_slave_netdev_event(unsigned long event,
3209                                    struct net_device *slave_dev)
3210 {
3211         struct net_device *bond_dev = slave_dev->master;
3212         struct bonding *bond = netdev_priv(bond_dev);
3213         struct slave *slave = NULL;
3214
3215         switch (event) {
3216         case NETDEV_UNREGISTER:
3217                 if (bond_dev) {
3218                         if (bond->setup_by_slave)
3219                                 bond_release_and_destroy(bond_dev, slave_dev);
3220                         else
3221                                 bond_release(bond_dev, slave_dev);
3222                 }
3223                 break;
3224         case NETDEV_UP:
3225         case NETDEV_CHANGE:
3226                 slave = bond_get_slave_by_dev(bond, slave_dev);
3227                 if (slave) {
3228                         u32 old_speed = slave->speed;
3229                         u8  old_duplex = slave->duplex;
3230
3231                         bond_update_speed_duplex(slave);
3232
3233                         if (bond->params.mode == BOND_MODE_8023AD) {
3234                                 if (old_speed != slave->speed)
3235                                         bond_3ad_adapter_speed_changed(slave);
3236                                 if (old_duplex != slave->duplex)
3237                                         bond_3ad_adapter_duplex_changed(slave);
3238                         }
3239                 }
3240
3241                 break;
3242         case NETDEV_DOWN:
3243                 /*
3244                  * ... Or is it this?
3245                  */
3246                 break;
3247         case NETDEV_CHANGEMTU:
3248                 /*
3249                  * TODO: Should slaves be allowed to
3250                  * independently alter their MTU?  For
3251                  * an active-backup bond, slaves need
3252                  * not be the same type of device, so
3253                  * MTUs may vary.  For other modes,
3254                  * slaves arguably should have the
3255                  * same MTUs. To do this, we'd need to
3256                  * take over the slave's change_mtu
3257                  * function for the duration of their
3258                  * servitude.
3259                  */
3260                 break;
3261         case NETDEV_CHANGENAME:
3262                 /*
3263                  * TODO: handle changing the primary's name
3264                  */
3265                 break;
3266         case NETDEV_FEAT_CHANGE:
3267                 bond_compute_features(bond);
3268                 break;
3269         default:
3270                 break;
3271         }
3272
3273         return NOTIFY_DONE;
3274 }
3275
3276 /*
3277  * bond_netdev_event: handle netdev notifier chain events.
3278  *
3279  * This function receives events for the netdev chain.  The caller (an
3280  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3281  * locks for us to safely manipulate the slave devices (RTNL lock,
3282  * dev_probe_lock).
3283  */
3284 static int bond_netdev_event(struct notifier_block *this,
3285                              unsigned long event, void *ptr)
3286 {
3287         struct net_device *event_dev = (struct net_device *)ptr;
3288
3289         pr_debug("event_dev: %s, event: %lx\n",
3290                  event_dev ? event_dev->name : "None",
3291                  event);
3292
3293         if (!(event_dev->priv_flags & IFF_BONDING))
3294                 return NOTIFY_DONE;
3295
3296         if (event_dev->flags & IFF_MASTER) {
3297                 pr_debug("IFF_MASTER\n");
3298                 return bond_master_netdev_event(event, event_dev);
3299         }
3300
3301         if (event_dev->flags & IFF_SLAVE) {
3302                 pr_debug("IFF_SLAVE\n");
3303                 return bond_slave_netdev_event(event, event_dev);
3304         }
3305
3306         return NOTIFY_DONE;
3307 }
3308
3309 /*
3310  * bond_inetaddr_event: handle inetaddr notifier chain events.
3311  *
3312  * We keep track of device IPs primarily to use as source addresses in
3313  * ARP monitor probes (rather than spewing out broadcasts all the time).
3314  *
3315  * We track one IP for the main device (if it has one), plus one per VLAN.
3316  */
3317 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3318 {
3319         struct in_ifaddr *ifa = ptr;
3320         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3321         struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3322         struct bonding *bond;
3323         struct vlan_entry *vlan;
3324
3325         list_for_each_entry(bond, &bn->dev_list, bond_list) {
3326                 if (bond->dev == event_dev) {
3327                         switch (event) {
3328                         case NETDEV_UP:
3329                                 bond->master_ip = ifa->ifa_local;
3330                                 return NOTIFY_OK;
3331                         case NETDEV_DOWN:
3332                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3333                                 return NOTIFY_OK;
3334                         default:
3335                                 return NOTIFY_DONE;
3336                         }
3337                 }
3338
3339                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3340                         vlan_dev = __vlan_find_dev_deep(bond->dev,
3341                                                         vlan->vlan_id);
3342                         if (vlan_dev == event_dev) {
3343                                 switch (event) {
3344                                 case NETDEV_UP:
3345                                         vlan->vlan_ip = ifa->ifa_local;
3346                                         return NOTIFY_OK;
3347                                 case NETDEV_DOWN:
3348                                         vlan->vlan_ip =
3349                                                 bond_glean_dev_ip(vlan_dev);
3350                                         return NOTIFY_OK;
3351                                 default:
3352                                         return NOTIFY_DONE;
3353                                 }
3354                         }
3355                 }
3356         }
3357         return NOTIFY_DONE;
3358 }
3359
3360 static struct notifier_block bond_netdev_notifier = {
3361         .notifier_call = bond_netdev_event,
3362 };
3363
3364 static struct notifier_block bond_inetaddr_notifier = {
3365         .notifier_call = bond_inetaddr_event,
3366 };
3367
3368 /*---------------------------- Hashing Policies -----------------------------*/
3369
3370 /*
3371  * Hash for the output device based upon layer 2 and layer 3 data. If
3372  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3373  */
3374 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3375 {
3376         struct ethhdr *data = (struct ethhdr *)skb->data;
3377         struct iphdr *iph = ip_hdr(skb);
3378
3379         if (skb->protocol == htons(ETH_P_IP)) {
3380                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3381                         (data->h_dest[5] ^ data->h_source[5])) % count;
3382         }
3383
3384         return (data->h_dest[5] ^ data->h_source[5]) % count;
3385 }
3386
3387 /*
3388  * Hash for the output device based upon layer 3 and layer 4 data. If
3389  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3390  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3391  */
3392 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3393 {
3394         struct ethhdr *data = (struct ethhdr *)skb->data;
3395         struct iphdr *iph = ip_hdr(skb);
3396         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3397         int layer4_xor = 0;
3398
3399         if (skb->protocol == htons(ETH_P_IP)) {
3400                 if (!ip_is_fragment(iph) &&
3401                     (iph->protocol == IPPROTO_TCP ||
3402                      iph->protocol == IPPROTO_UDP)) {
3403                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3404                 }
3405                 return (layer4_xor ^
3406                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3407
3408         }
3409
3410         return (data->h_dest[5] ^ data->h_source[5]) % count;
3411 }
3412
3413 /*
3414  * Hash for the output device based upon layer 2 data
3415  */
3416 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3417 {
3418         struct ethhdr *data = (struct ethhdr *)skb->data;
3419
3420         return (data->h_dest[5] ^ data->h_source[5]) % count;
3421 }
3422
3423 /*-------------------------- Device entry points ----------------------------*/
3424
3425 static int bond_open(struct net_device *bond_dev)
3426 {
3427         struct bonding *bond = netdev_priv(bond_dev);
3428         struct slave *slave;
3429         int i;
3430
3431         /* reset slave->backup and slave->inactive */
3432         read_lock(&bond->lock);
3433         if (bond->slave_cnt > 0) {
3434                 read_lock(&bond->curr_slave_lock);
3435                 bond_for_each_slave(bond, slave, i) {
3436                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3437                                 && (slave != bond->curr_active_slave)) {
3438                                 bond_set_slave_inactive_flags(slave);
3439                         } else {
3440                                 bond_set_slave_active_flags(slave);
3441                         }
3442                 }
3443                 read_unlock(&bond->curr_slave_lock);
3444         }
3445         read_unlock(&bond->lock);
3446
3447         INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3448
3449         if (bond_is_lb(bond)) {
3450                 /* bond_alb_initialize must be called before the timer
3451                  * is started.
3452                  */
3453                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3454                         /* something went wrong - fail the open operation */
3455                         return -ENOMEM;
3456                 }
3457
3458                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3459                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3460         }
3461
3462         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3463                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3464                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3465         }
3466
3467         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3468                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3469                         INIT_DELAYED_WORK(&bond->arp_work,
3470                                           bond_activebackup_arp_mon);
3471                 else
3472                         INIT_DELAYED_WORK(&bond->arp_work,
3473                                           bond_loadbalance_arp_mon);
3474
3475                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3476                 if (bond->params.arp_validate)
3477                         bond->recv_probe = bond_arp_rcv;
3478         }
3479
3480         if (bond->params.mode == BOND_MODE_8023AD) {
3481                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3482                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3483                 /* register to receive LACPDUs */
3484                 bond->recv_probe = bond_3ad_lacpdu_recv;
3485                 bond_3ad_initiate_agg_selection(bond, 1);
3486         }
3487
3488         return 0;
3489 }
3490
3491 static int bond_close(struct net_device *bond_dev)
3492 {
3493         struct bonding *bond = netdev_priv(bond_dev);
3494
3495         write_lock_bh(&bond->lock);
3496
3497         bond->send_peer_notif = 0;
3498
3499         write_unlock_bh(&bond->lock);
3500
3501         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3502                 cancel_delayed_work_sync(&bond->mii_work);
3503         }
3504
3505         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3506                 cancel_delayed_work_sync(&bond->arp_work);
3507         }
3508
3509         switch (bond->params.mode) {
3510         case BOND_MODE_8023AD:
3511                 cancel_delayed_work_sync(&bond->ad_work);
3512                 break;
3513         case BOND_MODE_TLB:
3514         case BOND_MODE_ALB:
3515                 cancel_delayed_work_sync(&bond->alb_work);
3516                 break;
3517         default:
3518                 break;
3519         }
3520
3521         if (delayed_work_pending(&bond->mcast_work))
3522                 cancel_delayed_work_sync(&bond->mcast_work);
3523
3524         if (bond_is_lb(bond)) {
3525                 /* Must be called only after all
3526                  * slaves have been released
3527                  */
3528                 bond_alb_deinitialize(bond);
3529         }
3530         bond->recv_probe = NULL;
3531
3532         return 0;
3533 }
3534
3535 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3536                                                 struct rtnl_link_stats64 *stats)
3537 {
3538         struct bonding *bond = netdev_priv(bond_dev);
3539         struct rtnl_link_stats64 temp;
3540         struct slave *slave;
3541         int i;
3542
3543         memset(stats, 0, sizeof(*stats));
3544
3545         read_lock_bh(&bond->lock);
3546
3547         bond_for_each_slave(bond, slave, i) {
3548                 const struct rtnl_link_stats64 *sstats =
3549                         dev_get_stats(slave->dev, &temp);
3550
3551                 stats->rx_packets += sstats->rx_packets;
3552                 stats->rx_bytes += sstats->rx_bytes;
3553                 stats->rx_errors += sstats->rx_errors;
3554                 stats->rx_dropped += sstats->rx_dropped;
3555
3556                 stats->tx_packets += sstats->tx_packets;
3557                 stats->tx_bytes += sstats->tx_bytes;
3558                 stats->tx_errors += sstats->tx_errors;
3559                 stats->tx_dropped += sstats->tx_dropped;
3560
3561                 stats->multicast += sstats->multicast;
3562                 stats->collisions += sstats->collisions;
3563
3564                 stats->rx_length_errors += sstats->rx_length_errors;
3565                 stats->rx_over_errors += sstats->rx_over_errors;
3566                 stats->rx_crc_errors += sstats->rx_crc_errors;
3567                 stats->rx_frame_errors += sstats->rx_frame_errors;
3568                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3569                 stats->rx_missed_errors += sstats->rx_missed_errors;
3570
3571                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3572                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3573                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3574                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3575                 stats->tx_window_errors += sstats->tx_window_errors;
3576         }
3577
3578         read_unlock_bh(&bond->lock);
3579
3580         return stats;
3581 }
3582
3583 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3584 {
3585         struct net_device *slave_dev = NULL;
3586         struct ifbond k_binfo;
3587         struct ifbond __user *u_binfo = NULL;
3588         struct ifslave k_sinfo;
3589         struct ifslave __user *u_sinfo = NULL;
3590         struct mii_ioctl_data *mii = NULL;
3591         int res = 0;
3592
3593         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3594
3595         switch (cmd) {
3596         case SIOCGMIIPHY:
3597                 mii = if_mii(ifr);
3598                 if (!mii)
3599                         return -EINVAL;
3600
3601                 mii->phy_id = 0;
3602                 /* Fall Through */
3603         case SIOCGMIIREG:
3604                 /*
3605                  * We do this again just in case we were called by SIOCGMIIREG
3606                  * instead of SIOCGMIIPHY.
3607                  */
3608                 mii = if_mii(ifr);
3609                 if (!mii)
3610                         return -EINVAL;
3611
3612
3613                 if (mii->reg_num == 1) {
3614                         struct bonding *bond = netdev_priv(bond_dev);
3615                         mii->val_out = 0;
3616                         read_lock(&bond->lock);
3617                         read_lock(&bond->curr_slave_lock);
3618                         if (netif_carrier_ok(bond->dev))
3619                                 mii->val_out = BMSR_LSTATUS;
3620
3621                         read_unlock(&bond->curr_slave_lock);
3622                         read_unlock(&bond->lock);
3623                 }
3624
3625                 return 0;
3626         case BOND_INFO_QUERY_OLD:
3627         case SIOCBONDINFOQUERY:
3628                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3629
3630                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3631                         return -EFAULT;
3632
3633                 res = bond_info_query(bond_dev, &k_binfo);
3634                 if (res == 0 &&
3635                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3636                         return -EFAULT;
3637
3638                 return res;
3639         case BOND_SLAVE_INFO_QUERY_OLD:
3640         case SIOCBONDSLAVEINFOQUERY:
3641                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3642
3643                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3644                         return -EFAULT;
3645
3646                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3647                 if (res == 0 &&
3648                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3649                         return -EFAULT;
3650
3651                 return res;
3652         default:
3653                 /* Go on */
3654                 break;
3655         }
3656
3657         if (!capable(CAP_NET_ADMIN))
3658                 return -EPERM;
3659
3660         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3661
3662         pr_debug("slave_dev=%p:\n", slave_dev);
3663
3664         if (!slave_dev)
3665                 res = -ENODEV;
3666         else {
3667                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3668                 switch (cmd) {
3669                 case BOND_ENSLAVE_OLD:
3670                 case SIOCBONDENSLAVE:
3671                         res = bond_enslave(bond_dev, slave_dev);
3672                         break;
3673                 case BOND_RELEASE_OLD:
3674                 case SIOCBONDRELEASE:
3675                         res = bond_release(bond_dev, slave_dev);
3676                         break;
3677                 case BOND_SETHWADDR_OLD:
3678                 case SIOCBONDSETHWADDR:
3679                         res = bond_sethwaddr(bond_dev, slave_dev);
3680                         break;
3681                 case BOND_CHANGE_ACTIVE_OLD:
3682                 case SIOCBONDCHANGEACTIVE:
3683                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3684                         break;
3685                 default:
3686                         res = -EOPNOTSUPP;
3687                 }
3688
3689                 dev_put(slave_dev);
3690         }
3691
3692         return res;
3693 }
3694
3695 static bool bond_addr_in_mc_list(unsigned char *addr,
3696                                  struct netdev_hw_addr_list *list,
3697                                  int addrlen)
3698 {
3699         struct netdev_hw_addr *ha;
3700
3701         netdev_hw_addr_list_for_each(ha, list)
3702                 if (!memcmp(ha->addr, addr, addrlen))
3703                         return true;
3704
3705         return false;
3706 }
3707
3708 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3709 {
3710         struct bonding *bond = netdev_priv(bond_dev);
3711
3712         if (change & IFF_PROMISC)
3713                 bond_set_promiscuity(bond,
3714                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3715
3716         if (change & IFF_ALLMULTI)
3717                 bond_set_allmulti(bond,
3718                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3719 }
3720
3721 static void bond_set_multicast_list(struct net_device *bond_dev)
3722 {
3723         struct bonding *bond = netdev_priv(bond_dev);
3724         struct netdev_hw_addr *ha;
3725         bool found;
3726
3727         read_lock(&bond->lock);
3728
3729         /* looking for addresses to add to slaves' mc list */
3730         netdev_for_each_mc_addr(ha, bond_dev) {
3731                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3732                                              bond_dev->addr_len);
3733                 if (!found)
3734                         bond_mc_add(bond, ha->addr);
3735         }
3736
3737         /* looking for addresses to delete from slaves' list */
3738         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3739                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3740                                              bond_dev->addr_len);
3741                 if (!found)
3742                         bond_mc_del(bond, ha->addr);
3743         }
3744
3745         /* save master's multicast list */
3746         __hw_addr_flush(&bond->mc_list);
3747         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3748                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3749
3750         read_unlock(&bond->lock);
3751 }
3752
3753 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
3754 {
3755         struct bonding *bond = netdev_priv(dev);
3756         struct slave *slave = bond->first_slave;
3757
3758         if (slave) {
3759                 const struct net_device_ops *slave_ops
3760                         = slave->dev->netdev_ops;
3761                 if (slave_ops->ndo_neigh_setup)
3762                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
3763         }
3764         return 0;
3765 }
3766
3767 /*
3768  * Change the MTU of all of a master's slaves to match the master
3769  */
3770 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3771 {
3772         struct bonding *bond = netdev_priv(bond_dev);
3773         struct slave *slave, *stop_at;
3774         int res = 0;
3775         int i;
3776
3777         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3778                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3779
3780         /* Can't hold bond->lock with bh disabled here since
3781          * some base drivers panic. On the other hand we can't
3782          * hold bond->lock without bh disabled because we'll
3783          * deadlock. The only solution is to rely on the fact
3784          * that we're under rtnl_lock here, and the slaves
3785          * list won't change. This doesn't solve the problem
3786          * of setting the slave's MTU while it is
3787          * transmitting, but the assumption is that the base
3788          * driver can handle that.
3789          *
3790          * TODO: figure out a way to safely iterate the slaves
3791          * list, but without holding a lock around the actual
3792          * call to the base driver.
3793          */
3794
3795         bond_for_each_slave(bond, slave, i) {
3796                 pr_debug("s %p s->p %p c_m %p\n",
3797                          slave,
3798                          slave->prev,
3799                          slave->dev->netdev_ops->ndo_change_mtu);
3800
3801                 res = dev_set_mtu(slave->dev, new_mtu);
3802
3803                 if (res) {
3804                         /* If we failed to set the slave's mtu to the new value
3805                          * we must abort the operation even in ACTIVE_BACKUP
3806                          * mode, because if we allow the backup slaves to have
3807                          * different mtu values than the active slave we'll
3808                          * need to change their mtu when doing a failover. That
3809                          * means changing their mtu from timer context, which
3810                          * is probably not a good idea.
3811                          */
3812                         pr_debug("err %d %s\n", res, slave->dev->name);
3813                         goto unwind;
3814                 }
3815         }
3816
3817         bond_dev->mtu = new_mtu;
3818
3819         return 0;
3820
3821 unwind:
3822         /* unwind from head to the slave that failed */
3823         stop_at = slave;
3824         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3825                 int tmp_res;
3826
3827                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3828                 if (tmp_res) {
3829                         pr_debug("unwind err %d dev %s\n",
3830                                  tmp_res, slave->dev->name);
3831                 }
3832         }
3833
3834         return res;
3835 }
3836
3837 /*
3838  * Change HW address
3839  *
3840  * Note that many devices must be down to change the HW address, and
3841  * downing the master releases all slaves.  We can make bonds full of
3842  * bonding devices to test this, however.
3843  */
3844 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3845 {
3846         struct bonding *bond = netdev_priv(bond_dev);
3847         struct sockaddr *sa = addr, tmp_sa;
3848         struct slave *slave, *stop_at;
3849         int res = 0;
3850         int i;
3851
3852         if (bond->params.mode == BOND_MODE_ALB)
3853                 return bond_alb_set_mac_address(bond_dev, addr);
3854
3855
3856         pr_debug("bond=%p, name=%s\n",
3857                  bond, bond_dev ? bond_dev->name : "None");
3858
3859         /*
3860          * If fail_over_mac is set to active, do nothing and return
3861          * success.  Returning an error causes ifenslave to fail.
3862          */
3863         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3864                 return 0;
3865
3866         if (!is_valid_ether_addr(sa->sa_data))
3867                 return -EADDRNOTAVAIL;
3868
3869         /* Can't hold bond->lock with bh disabled here since
3870          * some base drivers panic. On the other hand we can't
3871          * hold bond->lock without bh disabled because we'll
3872          * deadlock. The only solution is to rely on the fact
3873          * that we're under rtnl_lock here, and the slaves
3874          * list won't change. This doesn't solve the problem
3875          * of setting the slave's hw address while it is
3876          * transmitting, but the assumption is that the base
3877          * driver can handle that.
3878          *
3879          * TODO: figure out a way to safely iterate the slaves
3880          * list, but without holding a lock around the actual
3881          * call to the base driver.
3882          */
3883
3884         bond_for_each_slave(bond, slave, i) {
3885                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3886                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3887
3888                 if (slave_ops->ndo_set_mac_address == NULL) {
3889                         res = -EOPNOTSUPP;
3890                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3891                         goto unwind;
3892                 }
3893
3894                 res = dev_set_mac_address(slave->dev, addr);
3895                 if (res) {
3896                         /* TODO: consider downing the slave
3897                          * and retry ?
3898                          * User should expect communications
3899                          * breakage anyway until ARP finish
3900                          * updating, so...
3901                          */
3902                         pr_debug("err %d %s\n", res, slave->dev->name);
3903                         goto unwind;
3904                 }
3905         }
3906
3907         /* success */
3908         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3909         return 0;
3910
3911 unwind:
3912         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3913         tmp_sa.sa_family = bond_dev->type;
3914
3915         /* unwind from head to the slave that failed */
3916         stop_at = slave;
3917         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3918                 int tmp_res;
3919
3920                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3921                 if (tmp_res) {
3922                         pr_debug("unwind err %d dev %s\n",
3923                                  tmp_res, slave->dev->name);
3924                 }
3925         }
3926
3927         return res;
3928 }
3929
3930 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3931 {
3932         struct bonding *bond = netdev_priv(bond_dev);
3933         struct slave *slave, *start_at;
3934         int i, slave_no, res = 1;
3935         struct iphdr *iph = ip_hdr(skb);
3936
3937         /*
3938          * Start with the curr_active_slave that joined the bond as the
3939          * default for sending IGMP traffic.  For failover purposes one
3940          * needs to maintain some consistency for the interface that will
3941          * send the join/membership reports.  The curr_active_slave found
3942          * will send all of this type of traffic.
3943          */
3944         if ((iph->protocol == IPPROTO_IGMP) &&
3945             (skb->protocol == htons(ETH_P_IP))) {
3946
3947                 read_lock(&bond->curr_slave_lock);
3948                 slave = bond->curr_active_slave;
3949                 read_unlock(&bond->curr_slave_lock);
3950
3951                 if (!slave)
3952                         goto out;
3953         } else {
3954                 /*
3955                  * Concurrent TX may collide on rr_tx_counter; we accept
3956                  * that as being rare enough not to justify using an
3957                  * atomic op here.
3958                  */
3959                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3960
3961                 bond_for_each_slave(bond, slave, i) {
3962                         slave_no--;
3963                         if (slave_no < 0)
3964                                 break;
3965                 }
3966         }
3967
3968         start_at = slave;
3969         bond_for_each_slave_from(bond, slave, i, start_at) {
3970                 if (IS_UP(slave->dev) &&
3971                     (slave->link == BOND_LINK_UP) &&
3972                     bond_is_active_slave(slave)) {
3973                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3974                         break;
3975                 }
3976         }
3977
3978 out:
3979         if (res) {
3980                 /* no suitable interface, frame not sent */
3981                 dev_kfree_skb(skb);
3982         }
3983
3984         return NETDEV_TX_OK;
3985 }
3986
3987
3988 /*
3989  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3990  * the bond has a usable interface.
3991  */
3992 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3993 {
3994         struct bonding *bond = netdev_priv(bond_dev);
3995         int res = 1;
3996
3997         read_lock(&bond->curr_slave_lock);
3998
3999         if (bond->curr_active_slave)
4000                 res = bond_dev_queue_xmit(bond, skb,
4001                         bond->curr_active_slave->dev);
4002
4003         if (res)
4004                 /* no suitable interface, frame not sent */
4005                 dev_kfree_skb(skb);
4006
4007         read_unlock(&bond->curr_slave_lock);
4008
4009         return NETDEV_TX_OK;
4010 }
4011
4012 /*
4013  * In bond_xmit_xor() , we determine the output device by using a pre-
4014  * determined xmit_hash_policy(), If the selected device is not enabled,
4015  * find the next active slave.
4016  */
4017 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4018 {
4019         struct bonding *bond = netdev_priv(bond_dev);
4020         struct slave *slave, *start_at;
4021         int slave_no;
4022         int i;
4023         int res = 1;
4024
4025         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4026
4027         bond_for_each_slave(bond, slave, i) {
4028                 slave_no--;
4029                 if (slave_no < 0)
4030                         break;
4031         }
4032
4033         start_at = slave;
4034
4035         bond_for_each_slave_from(bond, slave, i, start_at) {
4036                 if (IS_UP(slave->dev) &&
4037                     (slave->link == BOND_LINK_UP) &&
4038                     bond_is_active_slave(slave)) {
4039                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4040                         break;
4041                 }
4042         }
4043
4044         if (res) {
4045                 /* no suitable interface, frame not sent */
4046                 dev_kfree_skb(skb);
4047         }
4048
4049         return NETDEV_TX_OK;
4050 }
4051
4052 /*
4053  * in broadcast mode, we send everything to all usable interfaces.
4054  */
4055 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4056 {
4057         struct bonding *bond = netdev_priv(bond_dev);
4058         struct slave *slave, *start_at;
4059         struct net_device *tx_dev = NULL;
4060         int i;
4061         int res = 1;
4062
4063         read_lock(&bond->curr_slave_lock);
4064         start_at = bond->curr_active_slave;
4065         read_unlock(&bond->curr_slave_lock);
4066
4067         if (!start_at)
4068                 goto out;
4069
4070         bond_for_each_slave_from(bond, slave, i, start_at) {
4071                 if (IS_UP(slave->dev) &&
4072                     (slave->link == BOND_LINK_UP) &&
4073                     bond_is_active_slave(slave)) {
4074                         if (tx_dev) {
4075                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4076                                 if (!skb2) {
4077                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4078                                                bond_dev->name);
4079                                         continue;
4080                                 }
4081
4082                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4083                                 if (res) {
4084                                         dev_kfree_skb(skb2);
4085                                         continue;
4086                                 }
4087                         }
4088                         tx_dev = slave->dev;
4089                 }
4090         }
4091
4092         if (tx_dev)
4093                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4094
4095 out:
4096         if (res)
4097                 /* no suitable interface, frame not sent */
4098                 dev_kfree_skb(skb);
4099
4100         /* frame sent to all suitable interfaces */
4101         return NETDEV_TX_OK;
4102 }
4103
4104 /*------------------------- Device initialization ---------------------------*/
4105
4106 static void bond_set_xmit_hash_policy(struct bonding *bond)
4107 {
4108         switch (bond->params.xmit_policy) {
4109         case BOND_XMIT_POLICY_LAYER23:
4110                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4111                 break;
4112         case BOND_XMIT_POLICY_LAYER34:
4113                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4114                 break;
4115         case BOND_XMIT_POLICY_LAYER2:
4116         default:
4117                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4118                 break;
4119         }
4120 }
4121
4122 /*
4123  * Lookup the slave that corresponds to a qid
4124  */
4125 static inline int bond_slave_override(struct bonding *bond,
4126                                       struct sk_buff *skb)
4127 {
4128         int i, res = 1;
4129         struct slave *slave = NULL;
4130         struct slave *check_slave;
4131
4132         if (!skb->queue_mapping)
4133                 return 1;
4134
4135         /* Find out if any slaves have the same mapping as this skb. */
4136         bond_for_each_slave(bond, check_slave, i) {
4137                 if (check_slave->queue_id == skb->queue_mapping) {
4138                         slave = check_slave;
4139                         break;
4140                 }
4141         }
4142
4143         /* If the slave isn't UP, use default transmit policy. */
4144         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4145             (slave->link == BOND_LINK_UP)) {
4146                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4147         }
4148
4149         return res;
4150 }
4151
4152
4153 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4154 {
4155         /*
4156          * This helper function exists to help dev_pick_tx get the correct
4157          * destination queue.  Using a helper function skips a call to
4158          * skb_tx_hash and will put the skbs in the queue we expect on their
4159          * way down to the bonding driver.
4160          */
4161         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4162
4163         /*
4164          * Save the original txq to restore before passing to the driver
4165          */
4166         bond_queue_mapping(skb) = skb->queue_mapping;
4167
4168         if (unlikely(txq >= dev->real_num_tx_queues)) {
4169                 do {
4170                         txq -= dev->real_num_tx_queues;
4171                 } while (txq >= dev->real_num_tx_queues);
4172         }
4173         return txq;
4174 }
4175
4176 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4177 {
4178         struct bonding *bond = netdev_priv(dev);
4179
4180         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4181                 if (!bond_slave_override(bond, skb))
4182                         return NETDEV_TX_OK;
4183         }
4184
4185         switch (bond->params.mode) {
4186         case BOND_MODE_ROUNDROBIN:
4187                 return bond_xmit_roundrobin(skb, dev);
4188         case BOND_MODE_ACTIVEBACKUP:
4189                 return bond_xmit_activebackup(skb, dev);
4190         case BOND_MODE_XOR:
4191                 return bond_xmit_xor(skb, dev);
4192         case BOND_MODE_BROADCAST:
4193                 return bond_xmit_broadcast(skb, dev);
4194         case BOND_MODE_8023AD:
4195                 return bond_3ad_xmit_xor(skb, dev);
4196         case BOND_MODE_ALB:
4197         case BOND_MODE_TLB:
4198                 return bond_alb_xmit(skb, dev);
4199         default:
4200                 /* Should never happen, mode already checked */
4201                 pr_err("%s: Error: Unknown bonding mode %d\n",
4202                        dev->name, bond->params.mode);
4203                 WARN_ON_ONCE(1);
4204                 dev_kfree_skb(skb);
4205                 return NETDEV_TX_OK;
4206         }
4207 }
4208
4209 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4210 {
4211         struct bonding *bond = netdev_priv(dev);
4212         netdev_tx_t ret = NETDEV_TX_OK;
4213
4214         /*
4215          * If we risk deadlock from transmitting this in the
4216          * netpoll path, tell netpoll to queue the frame for later tx
4217          */
4218         if (is_netpoll_tx_blocked(dev))
4219                 return NETDEV_TX_BUSY;
4220
4221         read_lock(&bond->lock);
4222
4223         if (bond->slave_cnt)
4224                 ret = __bond_start_xmit(skb, dev);
4225         else
4226                 dev_kfree_skb(skb);
4227
4228         read_unlock(&bond->lock);
4229
4230         return ret;
4231 }
4232
4233 /*
4234  * set bond mode specific net device operations
4235  */
4236 void bond_set_mode_ops(struct bonding *bond, int mode)
4237 {
4238         struct net_device *bond_dev = bond->dev;
4239
4240         switch (mode) {
4241         case BOND_MODE_ROUNDROBIN:
4242                 break;
4243         case BOND_MODE_ACTIVEBACKUP:
4244                 break;
4245         case BOND_MODE_XOR:
4246                 bond_set_xmit_hash_policy(bond);
4247                 break;
4248         case BOND_MODE_BROADCAST:
4249                 break;
4250         case BOND_MODE_8023AD:
4251                 bond_set_xmit_hash_policy(bond);
4252                 break;
4253         case BOND_MODE_ALB:
4254                 /* FALLTHRU */
4255         case BOND_MODE_TLB:
4256                 break;
4257         default:
4258                 /* Should never happen, mode already checked */
4259                 pr_err("%s: Error: Unknown bonding mode %d\n",
4260                        bond_dev->name, mode);
4261                 break;
4262         }
4263 }
4264
4265 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4266                                     struct ethtool_drvinfo *drvinfo)
4267 {
4268         strncpy(drvinfo->driver, DRV_NAME, 32);
4269         strncpy(drvinfo->version, DRV_VERSION, 32);
4270         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4271 }
4272
4273 static const struct ethtool_ops bond_ethtool_ops = {
4274         .get_drvinfo            = bond_ethtool_get_drvinfo,
4275         .get_link               = ethtool_op_get_link,
4276 };
4277
4278 static const struct net_device_ops bond_netdev_ops = {
4279         .ndo_init               = bond_init,
4280         .ndo_uninit             = bond_uninit,
4281         .ndo_open               = bond_open,
4282         .ndo_stop               = bond_close,
4283         .ndo_start_xmit         = bond_start_xmit,
4284         .ndo_select_queue       = bond_select_queue,
4285         .ndo_get_stats64        = bond_get_stats,
4286         .ndo_do_ioctl           = bond_do_ioctl,
4287         .ndo_change_rx_flags    = bond_change_rx_flags,
4288         .ndo_set_rx_mode        = bond_set_multicast_list,
4289         .ndo_change_mtu         = bond_change_mtu,
4290         .ndo_set_mac_address    = bond_set_mac_address,
4291         .ndo_neigh_setup        = bond_neigh_setup,
4292         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4293         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4294 #ifdef CONFIG_NET_POLL_CONTROLLER
4295         .ndo_netpoll_setup      = bond_netpoll_setup,
4296         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4297         .ndo_poll_controller    = bond_poll_controller,
4298 #endif
4299         .ndo_add_slave          = bond_enslave,
4300         .ndo_del_slave          = bond_release,
4301         .ndo_fix_features       = bond_fix_features,
4302 };
4303
4304 static void bond_destructor(struct net_device *bond_dev)
4305 {
4306         struct bonding *bond = netdev_priv(bond_dev);
4307         if (bond->wq)
4308                 destroy_workqueue(bond->wq);
4309         free_netdev(bond_dev);
4310 }
4311
4312 static void bond_setup(struct net_device *bond_dev)
4313 {
4314         struct bonding *bond = netdev_priv(bond_dev);
4315
4316         /* initialize rwlocks */
4317         rwlock_init(&bond->lock);
4318         rwlock_init(&bond->curr_slave_lock);
4319
4320         bond->params = bonding_defaults;
4321
4322         /* Initialize pointers */
4323         bond->dev = bond_dev;
4324         INIT_LIST_HEAD(&bond->vlan_list);
4325
4326         /* Initialize the device entry points */
4327         ether_setup(bond_dev);
4328         bond_dev->netdev_ops = &bond_netdev_ops;
4329         bond_dev->ethtool_ops = &bond_ethtool_ops;
4330         bond_set_mode_ops(bond, bond->params.mode);
4331
4332         bond_dev->destructor = bond_destructor;
4333
4334         /* Initialize the device options */
4335         bond_dev->tx_queue_len = 0;
4336         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4337         bond_dev->priv_flags |= IFF_BONDING;
4338         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4339
4340         /* At first, we block adding VLANs. That's the only way to
4341          * prevent problems that occur when adding VLANs over an
4342          * empty bond. The block will be removed once non-challenged
4343          * slaves are enslaved.
4344          */
4345         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4346
4347         /* don't acquire bond device's netif_tx_lock when
4348          * transmitting */
4349         bond_dev->features |= NETIF_F_LLTX;
4350
4351         /* By default, we declare the bond to be fully
4352          * VLAN hardware accelerated capable. Special
4353          * care is taken in the various xmit functions
4354          * when there are slaves that are not hw accel
4355          * capable
4356          */
4357
4358         bond_dev->hw_features = BOND_VLAN_FEATURES |
4359                                 NETIF_F_HW_VLAN_TX |
4360                                 NETIF_F_HW_VLAN_RX |
4361                                 NETIF_F_HW_VLAN_FILTER;
4362
4363         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM);
4364         bond_dev->features |= bond_dev->hw_features;
4365 }
4366
4367 static void bond_work_cancel_all(struct bonding *bond)
4368 {
4369         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4370                 cancel_delayed_work_sync(&bond->mii_work);
4371
4372         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4373                 cancel_delayed_work_sync(&bond->arp_work);
4374
4375         if (bond->params.mode == BOND_MODE_ALB &&
4376             delayed_work_pending(&bond->alb_work))
4377                 cancel_delayed_work_sync(&bond->alb_work);
4378
4379         if (bond->params.mode == BOND_MODE_8023AD &&
4380             delayed_work_pending(&bond->ad_work))
4381                 cancel_delayed_work_sync(&bond->ad_work);
4382
4383         if (delayed_work_pending(&bond->mcast_work))
4384                 cancel_delayed_work_sync(&bond->mcast_work);
4385 }
4386
4387 /*
4388 * Destroy a bonding device.
4389 * Must be under rtnl_lock when this function is called.
4390 */
4391 static void bond_uninit(struct net_device *bond_dev)
4392 {
4393         struct bonding *bond = netdev_priv(bond_dev);
4394         struct vlan_entry *vlan, *tmp;
4395
4396         bond_netpoll_cleanup(bond_dev);
4397
4398         /* Release the bonded slaves */
4399         bond_release_all(bond_dev);
4400
4401         list_del(&bond->bond_list);
4402
4403         bond_work_cancel_all(bond);
4404
4405         bond_remove_proc_entry(bond);
4406
4407         bond_debug_unregister(bond);
4408
4409         __hw_addr_flush(&bond->mc_list);
4410
4411         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4412                 list_del(&vlan->vlan_list);
4413                 kfree(vlan);
4414         }
4415 }
4416
4417 /*------------------------- Module initialization ---------------------------*/
4418
4419 /*
4420  * Convert string input module parms.  Accept either the
4421  * number of the mode or its string name.  A bit complicated because
4422  * some mode names are substrings of other names, and calls from sysfs
4423  * may have whitespace in the name (trailing newlines, for example).
4424  */
4425 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4426 {
4427         int modeint = -1, i, rv;
4428         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4429
4430         for (p = (char *)buf; *p; p++)
4431                 if (!(isdigit(*p) || isspace(*p)))
4432                         break;
4433
4434         if (*p)
4435                 rv = sscanf(buf, "%20s", modestr);
4436         else
4437                 rv = sscanf(buf, "%d", &modeint);
4438
4439         if (!rv)
4440                 return -1;
4441
4442         for (i = 0; tbl[i].modename; i++) {
4443                 if (modeint == tbl[i].mode)
4444                         return tbl[i].mode;
4445                 if (strcmp(modestr, tbl[i].modename) == 0)
4446                         return tbl[i].mode;
4447         }
4448
4449         return -1;
4450 }
4451
4452 static int bond_check_params(struct bond_params *params)
4453 {
4454         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4455
4456         /*
4457          * Convert string parameters.
4458          */
4459         if (mode) {
4460                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4461                 if (bond_mode == -1) {
4462                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4463                                mode == NULL ? "NULL" : mode);
4464                         return -EINVAL;
4465                 }
4466         }
4467
4468         if (xmit_hash_policy) {
4469                 if ((bond_mode != BOND_MODE_XOR) &&
4470                     (bond_mode != BOND_MODE_8023AD)) {
4471                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4472                                bond_mode_name(bond_mode));
4473                 } else {
4474                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4475                                                         xmit_hashtype_tbl);
4476                         if (xmit_hashtype == -1) {
4477                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4478                                        xmit_hash_policy == NULL ? "NULL" :
4479                                        xmit_hash_policy);
4480                                 return -EINVAL;
4481                         }
4482                 }
4483         }
4484
4485         if (lacp_rate) {
4486                 if (bond_mode != BOND_MODE_8023AD) {
4487                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4488                                 bond_mode_name(bond_mode));
4489                 } else {
4490                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4491                         if (lacp_fast == -1) {
4492                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4493                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4494                                 return -EINVAL;
4495                         }
4496                 }
4497         }
4498
4499         if (ad_select) {
4500                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4501                 if (params->ad_select == -1) {
4502                         pr_err("Error: Invalid ad_select \"%s\"\n",
4503                                ad_select == NULL ? "NULL" : ad_select);
4504                         return -EINVAL;
4505                 }
4506
4507                 if (bond_mode != BOND_MODE_8023AD) {
4508                         pr_warning("ad_select param only affects 802.3ad mode\n");
4509                 }
4510         } else {
4511                 params->ad_select = BOND_AD_STABLE;
4512         }
4513
4514         if (max_bonds < 0) {
4515                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4516                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4517                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4518         }
4519
4520         if (miimon < 0) {
4521                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4522                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4523                 miimon = BOND_LINK_MON_INTERV;
4524         }
4525
4526         if (updelay < 0) {
4527                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4528                            updelay, INT_MAX);
4529                 updelay = 0;
4530         }
4531
4532         if (downdelay < 0) {
4533                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4534                            downdelay, INT_MAX);
4535                 downdelay = 0;
4536         }
4537
4538         if ((use_carrier != 0) && (use_carrier != 1)) {
4539                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4540                            use_carrier);
4541                 use_carrier = 1;
4542         }
4543
4544         if (num_peer_notif < 0 || num_peer_notif > 255) {
4545                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4546                            num_peer_notif);
4547                 num_peer_notif = 1;
4548         }
4549
4550         /* reset values for 802.3ad */
4551         if (bond_mode == BOND_MODE_8023AD) {
4552                 if (!miimon) {
4553                         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");
4554                         pr_warning("Forcing miimon to 100msec\n");
4555                         miimon = 100;
4556                 }
4557         }
4558
4559         if (tx_queues < 1 || tx_queues > 255) {
4560                 pr_warning("Warning: tx_queues (%d) should be between "
4561                            "1 and 255, resetting to %d\n",
4562                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4563                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4564         }
4565
4566         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4567                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4568                            "not of valid value (0/1), so it was set to "
4569                            "0\n", all_slaves_active);
4570                 all_slaves_active = 0;
4571         }
4572
4573         if (resend_igmp < 0 || resend_igmp > 255) {
4574                 pr_warning("Warning: resend_igmp (%d) should be between "
4575                            "0 and 255, resetting to %d\n",
4576                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4577                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4578         }
4579
4580         /* reset values for TLB/ALB */
4581         if ((bond_mode == BOND_MODE_TLB) ||
4582             (bond_mode == BOND_MODE_ALB)) {
4583                 if (!miimon) {
4584                         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");
4585                         pr_warning("Forcing miimon to 100msec\n");
4586                         miimon = 100;
4587                 }
4588         }
4589
4590         if (bond_mode == BOND_MODE_ALB) {
4591                 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",
4592                           updelay);
4593         }
4594
4595         if (!miimon) {
4596                 if (updelay || downdelay) {
4597                         /* just warn the user the up/down delay will have
4598                          * no effect since miimon is zero...
4599                          */
4600                         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",
4601                                    updelay, downdelay);
4602                 }
4603         } else {
4604                 /* don't allow arp monitoring */
4605                 if (arp_interval) {
4606                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4607                                    miimon, arp_interval);
4608                         arp_interval = 0;
4609                 }
4610
4611                 if ((updelay % miimon) != 0) {
4612                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4613                                    updelay, miimon,
4614                                    (updelay / miimon) * miimon);
4615                 }
4616
4617                 updelay /= miimon;
4618
4619                 if ((downdelay % miimon) != 0) {
4620                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4621                                    downdelay, miimon,
4622                                    (downdelay / miimon) * miimon);
4623                 }
4624
4625                 downdelay /= miimon;
4626         }
4627
4628         if (arp_interval < 0) {
4629                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4630                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4631                 arp_interval = BOND_LINK_ARP_INTERV;
4632         }
4633
4634         for (arp_ip_count = 0;
4635              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4636              arp_ip_count++) {
4637                 /* not complete check, but should be good enough to
4638                    catch mistakes */
4639                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4640                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4641                                    arp_ip_target[arp_ip_count]);
4642                         arp_interval = 0;
4643                 } else {
4644                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4645                         arp_target[arp_ip_count] = ip;
4646                 }
4647         }
4648
4649         if (arp_interval && !arp_ip_count) {
4650                 /* don't allow arping if no arp_ip_target given... */
4651                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4652                            arp_interval);
4653                 arp_interval = 0;
4654         }
4655
4656         if (arp_validate) {
4657                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4658                         pr_err("arp_validate only supported in active-backup mode\n");
4659                         return -EINVAL;
4660                 }
4661                 if (!arp_interval) {
4662                         pr_err("arp_validate requires arp_interval\n");
4663                         return -EINVAL;
4664                 }
4665
4666                 arp_validate_value = bond_parse_parm(arp_validate,
4667                                                      arp_validate_tbl);
4668                 if (arp_validate_value == -1) {
4669                         pr_err("Error: invalid arp_validate \"%s\"\n",
4670                                arp_validate == NULL ? "NULL" : arp_validate);
4671                         return -EINVAL;
4672                 }
4673         } else
4674                 arp_validate_value = 0;
4675
4676         if (miimon) {
4677                 pr_info("MII link monitoring set to %d ms\n", miimon);
4678         } else if (arp_interval) {
4679                 int i;
4680
4681                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4682                         arp_interval,
4683                         arp_validate_tbl[arp_validate_value].modename,
4684                         arp_ip_count);
4685
4686                 for (i = 0; i < arp_ip_count; i++)
4687                         pr_info(" %s", arp_ip_target[i]);
4688
4689                 pr_info("\n");
4690
4691         } else if (max_bonds) {
4692                 /* miimon and arp_interval not set, we need one so things
4693                  * work as expected, see bonding.txt for details
4694                  */
4695                 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");
4696         }
4697
4698         if (primary && !USES_PRIMARY(bond_mode)) {
4699                 /* currently, using a primary only makes sense
4700                  * in active backup, TLB or ALB modes
4701                  */
4702                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4703                            primary, bond_mode_name(bond_mode));
4704                 primary = NULL;
4705         }
4706
4707         if (primary && primary_reselect) {
4708                 primary_reselect_value = bond_parse_parm(primary_reselect,
4709                                                          pri_reselect_tbl);
4710                 if (primary_reselect_value == -1) {
4711                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4712                                primary_reselect ==
4713                                         NULL ? "NULL" : primary_reselect);
4714                         return -EINVAL;
4715                 }
4716         } else {
4717                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4718         }
4719
4720         if (fail_over_mac) {
4721                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4722                                                       fail_over_mac_tbl);
4723                 if (fail_over_mac_value == -1) {
4724                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4725                                arp_validate == NULL ? "NULL" : arp_validate);
4726                         return -EINVAL;
4727                 }
4728
4729                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4730                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4731         } else {
4732                 fail_over_mac_value = BOND_FOM_NONE;
4733         }
4734
4735         /* fill params struct with the proper values */
4736         params->mode = bond_mode;
4737         params->xmit_policy = xmit_hashtype;
4738         params->miimon = miimon;
4739         params->num_peer_notif = num_peer_notif;
4740         params->arp_interval = arp_interval;
4741         params->arp_validate = arp_validate_value;
4742         params->updelay = updelay;
4743         params->downdelay = downdelay;
4744         params->use_carrier = use_carrier;
4745         params->lacp_fast = lacp_fast;
4746         params->primary[0] = 0;
4747         params->primary_reselect = primary_reselect_value;
4748         params->fail_over_mac = fail_over_mac_value;
4749         params->tx_queues = tx_queues;
4750         params->all_slaves_active = all_slaves_active;
4751         params->resend_igmp = resend_igmp;
4752         params->min_links = min_links;
4753
4754         if (primary) {
4755                 strncpy(params->primary, primary, IFNAMSIZ);
4756                 params->primary[IFNAMSIZ - 1] = 0;
4757         }
4758
4759         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4760
4761         return 0;
4762 }
4763
4764 static struct lock_class_key bonding_netdev_xmit_lock_key;
4765 static struct lock_class_key bonding_netdev_addr_lock_key;
4766
4767 static void bond_set_lockdep_class_one(struct net_device *dev,
4768                                        struct netdev_queue *txq,
4769                                        void *_unused)
4770 {
4771         lockdep_set_class(&txq->_xmit_lock,
4772                           &bonding_netdev_xmit_lock_key);
4773 }
4774
4775 static void bond_set_lockdep_class(struct net_device *dev)
4776 {
4777         lockdep_set_class(&dev->addr_list_lock,
4778                           &bonding_netdev_addr_lock_key);
4779         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4780 }
4781
4782 /*
4783  * Called from registration process
4784  */
4785 static int bond_init(struct net_device *bond_dev)
4786 {
4787         struct bonding *bond = netdev_priv(bond_dev);
4788         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4789         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4790
4791         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4792
4793         /*
4794          * Initialize locks that may be required during
4795          * en/deslave operations.  All of the bond_open work
4796          * (of which this is part) should really be moved to
4797          * a phase prior to dev_open
4798          */
4799         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4800         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4801
4802         bond->wq = create_singlethread_workqueue(bond_dev->name);
4803         if (!bond->wq)
4804                 return -ENOMEM;
4805
4806         bond_set_lockdep_class(bond_dev);
4807
4808         bond_create_proc_entry(bond);
4809         list_add_tail(&bond->bond_list, &bn->dev_list);
4810
4811         bond_prepare_sysfs_group(bond);
4812
4813         bond_debug_register(bond);
4814
4815         __hw_addr_init(&bond->mc_list);
4816         return 0;
4817 }
4818
4819 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4820 {
4821         if (tb[IFLA_ADDRESS]) {
4822                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4823                         return -EINVAL;
4824                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4825                         return -EADDRNOTAVAIL;
4826         }
4827         return 0;
4828 }
4829
4830 static int bond_get_tx_queues(struct net *net, struct nlattr *tb[],
4831                               unsigned int *num_queues,
4832                               unsigned int *real_num_queues)
4833 {
4834         *num_queues = tx_queues;
4835         return 0;
4836 }
4837
4838 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4839         .kind           = "bond",
4840         .priv_size      = sizeof(struct bonding),
4841         .setup          = bond_setup,
4842         .validate       = bond_validate,
4843         .get_tx_queues  = bond_get_tx_queues,
4844 };
4845
4846 /* Create a new bond based on the specified name and bonding parameters.
4847  * If name is NULL, obtain a suitable "bond%d" name for us.
4848  * Caller must NOT hold rtnl_lock; we need to release it here before we
4849  * set up our sysfs entries.
4850  */
4851 int bond_create(struct net *net, const char *name)
4852 {
4853         struct net_device *bond_dev;
4854         int res;
4855
4856         rtnl_lock();
4857
4858         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4859                                    name ? name : "bond%d",
4860                                    bond_setup, tx_queues);
4861         if (!bond_dev) {
4862                 pr_err("%s: eek! can't alloc netdev!\n", name);
4863                 rtnl_unlock();
4864                 return -ENOMEM;
4865         }
4866
4867         dev_net_set(bond_dev, net);
4868         bond_dev->rtnl_link_ops = &bond_link_ops;
4869
4870         res = register_netdevice(bond_dev);
4871
4872         netif_carrier_off(bond_dev);
4873
4874         rtnl_unlock();
4875         if (res < 0)
4876                 bond_destructor(bond_dev);
4877         return res;
4878 }
4879
4880 static int __net_init bond_net_init(struct net *net)
4881 {
4882         struct bond_net *bn = net_generic(net, bond_net_id);
4883
4884         bn->net = net;
4885         INIT_LIST_HEAD(&bn->dev_list);
4886
4887         bond_create_proc_dir(bn);
4888         bond_create_sysfs(bn);
4889
4890         return 0;
4891 }
4892
4893 static void __net_exit bond_net_exit(struct net *net)
4894 {
4895         struct bond_net *bn = net_generic(net, bond_net_id);
4896
4897         bond_destroy_sysfs(bn);
4898         bond_destroy_proc_dir(bn);
4899 }
4900
4901 static struct pernet_operations bond_net_ops = {
4902         .init = bond_net_init,
4903         .exit = bond_net_exit,
4904         .id   = &bond_net_id,
4905         .size = sizeof(struct bond_net),
4906 };
4907
4908 static int __init bonding_init(void)
4909 {
4910         int i;
4911         int res;
4912
4913         pr_info("%s", bond_version);
4914
4915         res = bond_check_params(&bonding_defaults);
4916         if (res)
4917                 goto out;
4918
4919         res = register_pernet_subsys(&bond_net_ops);
4920         if (res)
4921                 goto out;
4922
4923         res = rtnl_link_register(&bond_link_ops);
4924         if (res)
4925                 goto err_link;
4926
4927         bond_create_debugfs();
4928
4929         for (i = 0; i < max_bonds; i++) {
4930                 res = bond_create(&init_net, NULL);
4931                 if (res)
4932                         goto err;
4933         }
4934
4935         register_netdevice_notifier(&bond_netdev_notifier);
4936         register_inetaddr_notifier(&bond_inetaddr_notifier);
4937 out:
4938         return res;
4939 err:
4940         rtnl_link_unregister(&bond_link_ops);
4941 err_link:
4942         unregister_pernet_subsys(&bond_net_ops);
4943         goto out;
4944
4945 }
4946
4947 static void __exit bonding_exit(void)
4948 {
4949         unregister_netdevice_notifier(&bond_netdev_notifier);
4950         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4951
4952         bond_destroy_debugfs();
4953
4954         rtnl_link_unregister(&bond_link_ops);
4955         unregister_pernet_subsys(&bond_net_ops);
4956
4957 #ifdef CONFIG_NET_POLL_CONTROLLER
4958         /*
4959          * Make sure we don't have an imbalance on our netpoll blocking
4960          */
4961         WARN_ON(atomic_read(&netpoll_block_tx));
4962 #endif
4963 }
4964
4965 module_init(bonding_init);
4966 module_exit(bonding_exit);
4967 MODULE_LICENSE("GPL");
4968 MODULE_VERSION(DRV_VERSION);
4969 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4970 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4971 MODULE_ALIAS_RTNL_LINK("bond");