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