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         dev_close(slave_dev);
1870
1871 err_unset_master:
1872         netdev_set_bond_master(slave_dev, NULL);
1873
1874 err_restore_mac:
1875         if (!bond->params.fail_over_mac) {
1876                 /* XXX TODO - fom follow mode needs to change master's
1877                  * MAC if this slave's MAC is in use by the bond, or at
1878                  * least print a warning.
1879                  */
1880                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1881                 addr.sa_family = slave_dev->type;
1882                 dev_set_mac_address(slave_dev, &addr);
1883         }
1884
1885 err_restore_mtu:
1886         dev_set_mtu(slave_dev, new_slave->original_mtu);
1887
1888 err_free:
1889         kfree(new_slave);
1890
1891 err_undo_flags:
1892         bond_compute_features(bond);
1893
1894         return res;
1895 }
1896
1897 /*
1898  * Try to release the slave device <slave> from the bond device <master>
1899  * It is legal to access curr_active_slave without a lock because all the function
1900  * is write-locked.
1901  *
1902  * The rules for slave state should be:
1903  *   for Active/Backup:
1904  *     Active stays on all backups go down
1905  *   for Bonded connections:
1906  *     The first up interface should be left on and all others downed.
1907  */
1908 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1909 {
1910         struct bonding *bond = netdev_priv(bond_dev);
1911         struct slave *slave, *oldcurrent;
1912         struct sockaddr addr;
1913         u32 old_features = bond_dev->features;
1914
1915         /* slave is not a slave or master is not master of this slave */
1916         if (!(slave_dev->flags & IFF_SLAVE) ||
1917             (slave_dev->master != bond_dev)) {
1918                 pr_err("%s: Error: cannot release %s.\n",
1919                        bond_dev->name, slave_dev->name);
1920                 return -EINVAL;
1921         }
1922
1923         block_netpoll_tx();
1924         netdev_bonding_change(bond_dev, NETDEV_RELEASE);
1925         write_lock_bh(&bond->lock);
1926
1927         slave = bond_get_slave_by_dev(bond, slave_dev);
1928         if (!slave) {
1929                 /* not a slave of this bond */
1930                 pr_info("%s: %s not enslaved\n",
1931                         bond_dev->name, slave_dev->name);
1932                 write_unlock_bh(&bond->lock);
1933                 unblock_netpoll_tx();
1934                 return -EINVAL;
1935         }
1936
1937         write_unlock_bh(&bond->lock);
1938         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1939          * for this slave anymore.
1940          */
1941         netdev_rx_handler_unregister(slave_dev);
1942         write_lock_bh(&bond->lock);
1943
1944         if (!bond->params.fail_over_mac) {
1945                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1946                     bond->slave_cnt > 1)
1947                         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",
1948                                    bond_dev->name, slave_dev->name,
1949                                    slave->perm_hwaddr,
1950                                    bond_dev->name, slave_dev->name);
1951         }
1952
1953         /* Inform AD package of unbinding of slave. */
1954         if (bond->params.mode == BOND_MODE_8023AD) {
1955                 /* must be called before the slave is
1956                  * detached from the list
1957                  */
1958                 bond_3ad_unbind_slave(slave);
1959         }
1960
1961         pr_info("%s: releasing %s interface %s\n",
1962                 bond_dev->name,
1963                 bond_is_active_slave(slave) ? "active" : "backup",
1964                 slave_dev->name);
1965
1966         oldcurrent = bond->curr_active_slave;
1967
1968         bond->current_arp_slave = NULL;
1969
1970         /* release the slave from its bond */
1971         bond_detach_slave(bond, slave);
1972
1973         if (bond->primary_slave == slave)
1974                 bond->primary_slave = NULL;
1975
1976         if (oldcurrent == slave)
1977                 bond_change_active_slave(bond, NULL);
1978
1979         if (bond_is_lb(bond)) {
1980                 /* Must be called only after the slave has been
1981                  * detached from the list and the curr_active_slave
1982                  * has been cleared (if our_slave == old_current),
1983                  * but before a new active slave is selected.
1984                  */
1985                 write_unlock_bh(&bond->lock);
1986                 bond_alb_deinit_slave(bond, slave);
1987                 write_lock_bh(&bond->lock);
1988         }
1989
1990         if (oldcurrent == slave) {
1991                 /*
1992                  * Note that we hold RTNL over this sequence, so there
1993                  * is no concern that another slave add/remove event
1994                  * will interfere.
1995                  */
1996                 write_unlock_bh(&bond->lock);
1997                 read_lock(&bond->lock);
1998                 write_lock_bh(&bond->curr_slave_lock);
1999
2000                 bond_select_active_slave(bond);
2001
2002                 write_unlock_bh(&bond->curr_slave_lock);
2003                 read_unlock(&bond->lock);
2004                 write_lock_bh(&bond->lock);
2005         }
2006
2007         if (bond->slave_cnt == 0) {
2008                 bond_set_carrier(bond);
2009
2010                 /* if the last slave was removed, zero the mac address
2011                  * of the master so it will be set by the application
2012                  * to the mac address of the first slave
2013                  */
2014                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2015
2016                 if (bond_vlan_used(bond)) {
2017                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2018                                    bond_dev->name, bond_dev->name);
2019                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2020                                    bond_dev->name);
2021                 }
2022         }
2023
2024         write_unlock_bh(&bond->lock);
2025         unblock_netpoll_tx();
2026
2027         bond_compute_features(bond);
2028         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2029             (old_features & NETIF_F_VLAN_CHALLENGED))
2030                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2031                         bond_dev->name, slave_dev->name, bond_dev->name);
2032
2033         /* must do this from outside any spinlocks */
2034         bond_destroy_slave_symlinks(bond_dev, slave_dev);
2035
2036         bond_del_vlans_from_slave(bond, slave_dev);
2037
2038         /* If the mode USES_PRIMARY, then we should only remove its
2039          * promisc and mc settings if it was the curr_active_slave, but that was
2040          * already taken care of above when we detached the slave
2041          */
2042         if (!USES_PRIMARY(bond->params.mode)) {
2043                 /* unset promiscuity level from slave */
2044                 if (bond_dev->flags & IFF_PROMISC)
2045                         dev_set_promiscuity(slave_dev, -1);
2046
2047                 /* unset allmulti level from slave */
2048                 if (bond_dev->flags & IFF_ALLMULTI)
2049                         dev_set_allmulti(slave_dev, -1);
2050
2051                 /* flush master's mc_list from slave */
2052                 netif_addr_lock_bh(bond_dev);
2053                 bond_mc_list_flush(bond_dev, slave_dev);
2054                 netif_addr_unlock_bh(bond_dev);
2055         }
2056
2057         netdev_set_bond_master(slave_dev, NULL);
2058
2059         slave_disable_netpoll(slave);
2060
2061         /* close slave before restoring its mac address */
2062         dev_close(slave_dev);
2063
2064         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2065                 /* restore original ("permanent") mac address */
2066                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2067                 addr.sa_family = slave_dev->type;
2068                 dev_set_mac_address(slave_dev, &addr);
2069         }
2070
2071         dev_set_mtu(slave_dev, slave->original_mtu);
2072
2073         slave_dev->priv_flags &= ~IFF_BONDING;
2074
2075         kfree(slave);
2076
2077         return 0;  /* deletion OK */
2078 }
2079
2080 /*
2081 * First release a slave and then destroy the bond if no more slaves are left.
2082 * Must be under rtnl_lock when this function is called.
2083 */
2084 static int  bond_release_and_destroy(struct net_device *bond_dev,
2085                                      struct net_device *slave_dev)
2086 {
2087         struct bonding *bond = netdev_priv(bond_dev);
2088         int ret;
2089
2090         ret = bond_release(bond_dev, slave_dev);
2091         if ((ret == 0) && (bond->slave_cnt == 0)) {
2092                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2093                 pr_info("%s: destroying bond %s.\n",
2094                         bond_dev->name, bond_dev->name);
2095                 unregister_netdevice(bond_dev);
2096         }
2097         return ret;
2098 }
2099
2100 /*
2101  * This function releases all slaves.
2102  */
2103 static int bond_release_all(struct net_device *bond_dev)
2104 {
2105         struct bonding *bond = netdev_priv(bond_dev);
2106         struct slave *slave;
2107         struct net_device *slave_dev;
2108         struct sockaddr addr;
2109
2110         write_lock_bh(&bond->lock);
2111
2112         netif_carrier_off(bond_dev);
2113
2114         if (bond->slave_cnt == 0)
2115                 goto out;
2116
2117         bond->current_arp_slave = NULL;
2118         bond->primary_slave = NULL;
2119         bond_change_active_slave(bond, NULL);
2120
2121         while ((slave = bond->first_slave) != NULL) {
2122                 /* Inform AD package of unbinding of slave
2123                  * before slave is detached from the list.
2124                  */
2125                 if (bond->params.mode == BOND_MODE_8023AD)
2126                         bond_3ad_unbind_slave(slave);
2127
2128                 slave_dev = slave->dev;
2129                 bond_detach_slave(bond, slave);
2130
2131                 /* now that the slave is detached, unlock and perform
2132                  * all the undo steps that should not be called from
2133                  * within a lock.
2134                  */
2135                 write_unlock_bh(&bond->lock);
2136
2137                 /* unregister rx_handler early so bond_handle_frame wouldn't
2138                  * be called for this slave anymore.
2139                  */
2140                 netdev_rx_handler_unregister(slave_dev);
2141                 synchronize_net();
2142
2143                 if (bond_is_lb(bond)) {
2144                         /* must be called only after the slave
2145                          * has been detached from the list
2146                          */
2147                         bond_alb_deinit_slave(bond, slave);
2148                 }
2149
2150                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2151                 bond_del_vlans_from_slave(bond, slave_dev);
2152
2153                 /* If the mode USES_PRIMARY, then we should only remove its
2154                  * promisc and mc settings if it was the curr_active_slave, but that was
2155                  * already taken care of above when we detached the slave
2156                  */
2157                 if (!USES_PRIMARY(bond->params.mode)) {
2158                         /* unset promiscuity level from slave */
2159                         if (bond_dev->flags & IFF_PROMISC)
2160                                 dev_set_promiscuity(slave_dev, -1);
2161
2162                         /* unset allmulti level from slave */
2163                         if (bond_dev->flags & IFF_ALLMULTI)
2164                                 dev_set_allmulti(slave_dev, -1);
2165
2166                         /* flush master's mc_list from slave */
2167                         netif_addr_lock_bh(bond_dev);
2168                         bond_mc_list_flush(bond_dev, slave_dev);
2169                         netif_addr_unlock_bh(bond_dev);
2170                 }
2171
2172                 netdev_set_bond_master(slave_dev, NULL);
2173
2174                 slave_disable_netpoll(slave);
2175
2176                 /* close slave before restoring its mac address */
2177                 dev_close(slave_dev);
2178
2179                 if (!bond->params.fail_over_mac) {
2180                         /* restore original ("permanent") mac address*/
2181                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2182                         addr.sa_family = slave_dev->type;
2183                         dev_set_mac_address(slave_dev, &addr);
2184                 }
2185
2186                 kfree(slave);
2187
2188                 /* re-acquire the lock before getting the next slave */
2189                 write_lock_bh(&bond->lock);
2190         }
2191
2192         /* zero the mac address of the master so it will be
2193          * set by the application to the mac address of the
2194          * first slave
2195          */
2196         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2197
2198         if (bond_vlan_used(bond)) {
2199                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2200                            bond_dev->name, bond_dev->name);
2201                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2202                            bond_dev->name);
2203         }
2204
2205         pr_info("%s: released all slaves\n", bond_dev->name);
2206
2207 out:
2208         write_unlock_bh(&bond->lock);
2209
2210         bond_compute_features(bond);
2211
2212         return 0;
2213 }
2214
2215 /*
2216  * This function changes the active slave to slave <slave_dev>.
2217  * It returns -EINVAL in the following cases.
2218  *  - <slave_dev> is not found in the list.
2219  *  - There is not active slave now.
2220  *  - <slave_dev> is already active.
2221  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2222  *  - <slave_dev> is not running.
2223  * In these cases, this function does nothing.
2224  * In the other cases, current_slave pointer is changed and 0 is returned.
2225  */
2226 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2227 {
2228         struct bonding *bond = netdev_priv(bond_dev);
2229         struct slave *old_active = NULL;
2230         struct slave *new_active = NULL;
2231         int res = 0;
2232
2233         if (!USES_PRIMARY(bond->params.mode))
2234                 return -EINVAL;
2235
2236         /* Verify that master_dev is indeed the master of slave_dev */
2237         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2238                 return -EINVAL;
2239
2240         read_lock(&bond->lock);
2241
2242         read_lock(&bond->curr_slave_lock);
2243         old_active = bond->curr_active_slave;
2244         read_unlock(&bond->curr_slave_lock);
2245
2246         new_active = bond_get_slave_by_dev(bond, slave_dev);
2247
2248         /*
2249          * Changing to the current active: do nothing; return success.
2250          */
2251         if (new_active && (new_active == old_active)) {
2252                 read_unlock(&bond->lock);
2253                 return 0;
2254         }
2255
2256         if ((new_active) &&
2257             (old_active) &&
2258             (new_active->link == BOND_LINK_UP) &&
2259             IS_UP(new_active->dev)) {
2260                 block_netpoll_tx();
2261                 write_lock_bh(&bond->curr_slave_lock);
2262                 bond_change_active_slave(bond, new_active);
2263                 write_unlock_bh(&bond->curr_slave_lock);
2264                 unblock_netpoll_tx();
2265         } else
2266                 res = -EINVAL;
2267
2268         read_unlock(&bond->lock);
2269
2270         return res;
2271 }
2272
2273 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2274 {
2275         struct bonding *bond = netdev_priv(bond_dev);
2276
2277         info->bond_mode = bond->params.mode;
2278         info->miimon = bond->params.miimon;
2279
2280         read_lock(&bond->lock);
2281         info->num_slaves = bond->slave_cnt;
2282         read_unlock(&bond->lock);
2283
2284         return 0;
2285 }
2286
2287 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2288 {
2289         struct bonding *bond = netdev_priv(bond_dev);
2290         struct slave *slave;
2291         int i, res = -ENODEV;
2292
2293         read_lock(&bond->lock);
2294
2295         bond_for_each_slave(bond, slave, i) {
2296                 if (i == (int)info->slave_id) {
2297                         res = 0;
2298                         strcpy(info->slave_name, slave->dev->name);
2299                         info->link = slave->link;
2300                         info->state = bond_slave_state(slave);
2301                         info->link_failure_count = slave->link_failure_count;
2302                         break;
2303                 }
2304         }
2305
2306         read_unlock(&bond->lock);
2307
2308         return res;
2309 }
2310
2311 /*-------------------------------- Monitoring -------------------------------*/
2312
2313
2314 static int bond_miimon_inspect(struct bonding *bond)
2315 {
2316         struct slave *slave;
2317         int i, link_state, commit = 0;
2318         bool ignore_updelay;
2319
2320         ignore_updelay = !bond->curr_active_slave ? true : false;
2321
2322         bond_for_each_slave(bond, slave, i) {
2323                 slave->new_link = BOND_LINK_NOCHANGE;
2324
2325                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2326
2327                 switch (slave->link) {
2328                 case BOND_LINK_UP:
2329                         if (link_state)
2330                                 continue;
2331
2332                         slave->link = BOND_LINK_FAIL;
2333                         slave->delay = bond->params.downdelay;
2334                         if (slave->delay) {
2335                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2336                                         bond->dev->name,
2337                                         (bond->params.mode ==
2338                                          BOND_MODE_ACTIVEBACKUP) ?
2339                                         (bond_is_active_slave(slave) ?
2340                                          "active " : "backup ") : "",
2341                                         slave->dev->name,
2342                                         bond->params.downdelay * bond->params.miimon);
2343                         }
2344                         /*FALLTHRU*/
2345                 case BOND_LINK_FAIL:
2346                         if (link_state) {
2347                                 /*
2348                                  * recovered before downdelay expired
2349                                  */
2350                                 slave->link = BOND_LINK_UP;
2351                                 slave->jiffies = jiffies;
2352                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2353                                         bond->dev->name,
2354                                         (bond->params.downdelay - slave->delay) *
2355                                         bond->params.miimon,
2356                                         slave->dev->name);
2357                                 continue;
2358                         }
2359
2360                         if (slave->delay <= 0) {
2361                                 slave->new_link = BOND_LINK_DOWN;
2362                                 commit++;
2363                                 continue;
2364                         }
2365
2366                         slave->delay--;
2367                         break;
2368
2369                 case BOND_LINK_DOWN:
2370                         if (!link_state)
2371                                 continue;
2372
2373                         slave->link = BOND_LINK_BACK;
2374                         slave->delay = bond->params.updelay;
2375
2376                         if (slave->delay) {
2377                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2378                                         bond->dev->name, slave->dev->name,
2379                                         ignore_updelay ? 0 :
2380                                         bond->params.updelay *
2381                                         bond->params.miimon);
2382                         }
2383                         /*FALLTHRU*/
2384                 case BOND_LINK_BACK:
2385                         if (!link_state) {
2386                                 slave->link = BOND_LINK_DOWN;
2387                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2388                                         bond->dev->name,
2389                                         (bond->params.updelay - slave->delay) *
2390                                         bond->params.miimon,
2391                                         slave->dev->name);
2392
2393                                 continue;
2394                         }
2395
2396                         if (ignore_updelay)
2397                                 slave->delay = 0;
2398
2399                         if (slave->delay <= 0) {
2400                                 slave->new_link = BOND_LINK_UP;
2401                                 commit++;
2402                                 ignore_updelay = false;
2403                                 continue;
2404                         }
2405
2406                         slave->delay--;
2407                         break;
2408                 }
2409         }
2410
2411         return commit;
2412 }
2413
2414 static void bond_miimon_commit(struct bonding *bond)
2415 {
2416         struct slave *slave;
2417         int i;
2418
2419         bond_for_each_slave(bond, slave, i) {
2420                 switch (slave->new_link) {
2421                 case BOND_LINK_NOCHANGE:
2422                         continue;
2423
2424                 case BOND_LINK_UP:
2425                         slave->link = BOND_LINK_UP;
2426                         slave->jiffies = jiffies;
2427
2428                         if (bond->params.mode == BOND_MODE_8023AD) {
2429                                 /* prevent it from being the active one */
2430                                 bond_set_backup_slave(slave);
2431                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2432                                 /* make it immediately active */
2433                                 bond_set_active_slave(slave);
2434                         } else if (slave != bond->primary_slave) {
2435                                 /* prevent it from being the active one */
2436                                 bond_set_backup_slave(slave);
2437                         }
2438
2439                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2440                                 bond->dev->name, slave->dev->name,
2441                                 slave->speed, slave->duplex ? "full" : "half");
2442
2443                         /* notify ad that the link status has changed */
2444                         if (bond->params.mode == BOND_MODE_8023AD)
2445                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2446
2447                         if (bond_is_lb(bond))
2448                                 bond_alb_handle_link_change(bond, slave,
2449                                                             BOND_LINK_UP);
2450
2451                         if (!bond->curr_active_slave ||
2452                             (slave == bond->primary_slave))
2453                                 goto do_failover;
2454
2455                         continue;
2456
2457                 case BOND_LINK_DOWN:
2458                         if (slave->link_failure_count < UINT_MAX)
2459                                 slave->link_failure_count++;
2460
2461                         slave->link = BOND_LINK_DOWN;
2462
2463                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2464                             bond->params.mode == BOND_MODE_8023AD)
2465                                 bond_set_slave_inactive_flags(slave);
2466
2467                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2468                                 bond->dev->name, slave->dev->name);
2469
2470                         if (bond->params.mode == BOND_MODE_8023AD)
2471                                 bond_3ad_handle_link_change(slave,
2472                                                             BOND_LINK_DOWN);
2473
2474                         if (bond_is_lb(bond))
2475                                 bond_alb_handle_link_change(bond, slave,
2476                                                             BOND_LINK_DOWN);
2477
2478                         if (slave == bond->curr_active_slave)
2479                                 goto do_failover;
2480
2481                         continue;
2482
2483                 default:
2484                         pr_err("%s: invalid new link %d on slave %s\n",
2485                                bond->dev->name, slave->new_link,
2486                                slave->dev->name);
2487                         slave->new_link = BOND_LINK_NOCHANGE;
2488
2489                         continue;
2490                 }
2491
2492 do_failover:
2493                 ASSERT_RTNL();
2494                 block_netpoll_tx();
2495                 write_lock_bh(&bond->curr_slave_lock);
2496                 bond_select_active_slave(bond);
2497                 write_unlock_bh(&bond->curr_slave_lock);
2498                 unblock_netpoll_tx();
2499         }
2500
2501         bond_set_carrier(bond);
2502 }
2503
2504 /*
2505  * bond_mii_monitor
2506  *
2507  * Really a wrapper that splits the mii monitor into two phases: an
2508  * inspection, then (if inspection indicates something needs to be done)
2509  * an acquisition of appropriate locks followed by a commit phase to
2510  * implement whatever link state changes are indicated.
2511  */
2512 void bond_mii_monitor(struct work_struct *work)
2513 {
2514         struct bonding *bond = container_of(work, struct bonding,
2515                                             mii_work.work);
2516         bool should_notify_peers = false;
2517         unsigned long delay;
2518
2519         read_lock(&bond->lock);
2520
2521         delay = msecs_to_jiffies(bond->params.miimon);
2522
2523         if (bond->slave_cnt == 0)
2524                 goto re_arm;
2525
2526         should_notify_peers = bond_should_notify_peers(bond);
2527
2528         if (bond_miimon_inspect(bond)) {
2529                 read_unlock(&bond->lock);
2530
2531                 /* Race avoidance with bond_close cancel of workqueue */
2532                 if (!rtnl_trylock()) {
2533                         read_lock(&bond->lock);
2534                         delay = 1;
2535                         should_notify_peers = false;
2536                         goto re_arm;
2537                 }
2538
2539                 read_lock(&bond->lock);
2540
2541                 bond_miimon_commit(bond);
2542
2543                 read_unlock(&bond->lock);
2544                 rtnl_unlock();  /* might sleep, hold no other locks */
2545                 read_lock(&bond->lock);
2546         }
2547
2548 re_arm:
2549         if (bond->params.miimon)
2550                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2551
2552         read_unlock(&bond->lock);
2553
2554         if (should_notify_peers) {
2555                 if (!rtnl_trylock()) {
2556                         read_lock(&bond->lock);
2557                         bond->send_peer_notif++;
2558                         read_unlock(&bond->lock);
2559                         return;
2560                 }
2561                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
2562                 rtnl_unlock();
2563         }
2564 }
2565
2566 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2567 {
2568         struct vlan_entry *vlan;
2569
2570         if (ip == bond->master_ip)
2571                 return 1;
2572
2573         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2574                 if (ip == vlan->vlan_ip)
2575                         return 1;
2576         }
2577
2578         return 0;
2579 }
2580
2581 /*
2582  * We go to the (large) trouble of VLAN tagging ARP frames because
2583  * switches in VLAN mode (especially if ports are configured as
2584  * "native" to a VLAN) might not pass non-tagged frames.
2585  */
2586 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2587 {
2588         struct sk_buff *skb;
2589
2590         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2591                  slave_dev->name, dest_ip, src_ip, vlan_id);
2592
2593         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2594                          NULL, slave_dev->dev_addr, NULL);
2595
2596         if (!skb) {
2597                 pr_err("ARP packet allocation failed\n");
2598                 return;
2599         }
2600         if (vlan_id) {
2601                 skb = vlan_put_tag(skb, vlan_id);
2602                 if (!skb) {
2603                         pr_err("failed to insert VLAN tag\n");
2604                         return;
2605                 }
2606         }
2607         arp_xmit(skb);
2608 }
2609
2610
2611 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2612 {
2613         int i, vlan_id;
2614         __be32 *targets = bond->params.arp_targets;
2615         struct vlan_entry *vlan;
2616         struct net_device *vlan_dev;
2617         struct rtable *rt;
2618
2619         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2620                 if (!targets[i])
2621                         break;
2622                 pr_debug("basa: target %x\n", targets[i]);
2623                 if (!bond_vlan_used(bond)) {
2624                         pr_debug("basa: empty vlan: arp_send\n");
2625                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2626                                       bond->master_ip, 0);
2627                         continue;
2628                 }
2629
2630                 /*
2631                  * If VLANs are configured, we do a route lookup to
2632                  * determine which VLAN interface would be used, so we
2633                  * can tag the ARP with the proper VLAN tag.
2634                  */
2635                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2636                                      RTO_ONLINK, 0);
2637                 if (IS_ERR(rt)) {
2638                         if (net_ratelimit()) {
2639                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2640                                            bond->dev->name, &targets[i]);
2641                         }
2642                         continue;
2643                 }
2644
2645                 /*
2646                  * This target is not on a VLAN
2647                  */
2648                 if (rt->dst.dev == bond->dev) {
2649                         ip_rt_put(rt);
2650                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2651                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2652                                       bond->master_ip, 0);
2653                         continue;
2654                 }
2655
2656                 vlan_id = 0;
2657                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2658                         rcu_read_lock();
2659                         vlan_dev = __vlan_find_dev_deep(bond->dev,
2660                                                         vlan->vlan_id);
2661                         rcu_read_unlock();
2662                         if (vlan_dev == rt->dst.dev) {
2663                                 vlan_id = vlan->vlan_id;
2664                                 pr_debug("basa: vlan match on %s %d\n",
2665                                        vlan_dev->name, vlan_id);
2666                                 break;
2667                         }
2668                 }
2669
2670                 if (vlan_id) {
2671                         ip_rt_put(rt);
2672                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2673                                       vlan->vlan_ip, vlan_id);
2674                         continue;
2675                 }
2676
2677                 if (net_ratelimit()) {
2678                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2679                                    bond->dev->name, &targets[i],
2680                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2681                 }
2682                 ip_rt_put(rt);
2683         }
2684 }
2685
2686 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2687 {
2688         int i;
2689         __be32 *targets = bond->params.arp_targets;
2690
2691         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2692                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2693                          &sip, &tip, i, &targets[i],
2694                          bond_has_this_ip(bond, tip));
2695                 if (sip == targets[i]) {
2696                         if (bond_has_this_ip(bond, tip))
2697                                 slave->last_arp_rx = jiffies;
2698                         return;
2699                 }
2700         }
2701 }
2702
2703 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,
2704                          struct slave *slave)
2705 {
2706         struct arphdr *arp;
2707         unsigned char *arp_ptr;
2708         __be32 sip, tip;
2709
2710         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2711                 return;
2712
2713         read_lock(&bond->lock);
2714
2715         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2716                  bond->dev->name, skb->dev->name);
2717
2718         if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
2719                 goto out_unlock;
2720
2721         arp = arp_hdr(skb);
2722         if (arp->ar_hln != bond->dev->addr_len ||
2723             skb->pkt_type == PACKET_OTHERHOST ||
2724             skb->pkt_type == PACKET_LOOPBACK ||
2725             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2726             arp->ar_pro != htons(ETH_P_IP) ||
2727             arp->ar_pln != 4)
2728                 goto out_unlock;
2729
2730         arp_ptr = (unsigned char *)(arp + 1);
2731         arp_ptr += bond->dev->addr_len;
2732         memcpy(&sip, arp_ptr, 4);
2733         arp_ptr += 4 + bond->dev->addr_len;
2734         memcpy(&tip, arp_ptr, 4);
2735
2736         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2737                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2738                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2739                  &sip, &tip);
2740
2741         /*
2742          * Backup slaves won't see the ARP reply, but do come through
2743          * here for each ARP probe (so we swap the sip/tip to validate
2744          * the probe).  In a "redundant switch, common router" type of
2745          * configuration, the ARP probe will (hopefully) travel from
2746          * the active, through one switch, the router, then the other
2747          * switch before reaching the backup.
2748          */
2749         if (bond_is_active_slave(slave))
2750                 bond_validate_arp(bond, slave, sip, tip);
2751         else
2752                 bond_validate_arp(bond, slave, tip, sip);
2753
2754 out_unlock:
2755         read_unlock(&bond->lock);
2756 }
2757
2758 /*
2759  * this function is called regularly to monitor each slave's link
2760  * ensuring that traffic is being sent and received when arp monitoring
2761  * is used in load-balancing mode. if the adapter has been dormant, then an
2762  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2763  * arp monitoring in active backup mode.
2764  */
2765 void bond_loadbalance_arp_mon(struct work_struct *work)
2766 {
2767         struct bonding *bond = container_of(work, struct bonding,
2768                                             arp_work.work);
2769         struct slave *slave, *oldcurrent;
2770         int do_failover = 0;
2771         int delta_in_ticks;
2772         int i;
2773
2774         read_lock(&bond->lock);
2775
2776         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2777
2778         if (bond->slave_cnt == 0)
2779                 goto re_arm;
2780
2781         read_lock(&bond->curr_slave_lock);
2782         oldcurrent = bond->curr_active_slave;
2783         read_unlock(&bond->curr_slave_lock);
2784
2785         /* see if any of the previous devices are up now (i.e. they have
2786          * xmt and rcv traffic). the curr_active_slave does not come into
2787          * the picture unless it is null. also, slave->jiffies is not needed
2788          * here because we send an arp on each slave and give a slave as
2789          * long as it needs to get the tx/rx within the delta.
2790          * TODO: what about up/down delay in arp mode? it wasn't here before
2791          *       so it can wait
2792          */
2793         bond_for_each_slave(bond, slave, i) {
2794                 unsigned long trans_start = dev_trans_start(slave->dev);
2795
2796                 if (slave->link != BOND_LINK_UP) {
2797                         if (time_in_range(jiffies,
2798                                 trans_start - delta_in_ticks,
2799                                 trans_start + delta_in_ticks) &&
2800                             time_in_range(jiffies,
2801                                 slave->dev->last_rx - delta_in_ticks,
2802                                 slave->dev->last_rx + delta_in_ticks)) {
2803
2804                                 slave->link  = BOND_LINK_UP;
2805                                 bond_set_active_slave(slave);
2806
2807                                 /* primary_slave has no meaning in round-robin
2808                                  * mode. the window of a slave being up and
2809                                  * curr_active_slave being null after enslaving
2810                                  * is closed.
2811                                  */
2812                                 if (!oldcurrent) {
2813                                         pr_info("%s: link status definitely up for interface %s, ",
2814                                                 bond->dev->name,
2815                                                 slave->dev->name);
2816                                         do_failover = 1;
2817                                 } else {
2818                                         pr_info("%s: interface %s is now up\n",
2819                                                 bond->dev->name,
2820                                                 slave->dev->name);
2821                                 }
2822                         }
2823                 } else {
2824                         /* slave->link == BOND_LINK_UP */
2825
2826                         /* not all switches will respond to an arp request
2827                          * when the source ip is 0, so don't take the link down
2828                          * if we don't know our ip yet
2829                          */
2830                         if (!time_in_range(jiffies,
2831                                 trans_start - delta_in_ticks,
2832                                 trans_start + 2 * delta_in_ticks) ||
2833                             !time_in_range(jiffies,
2834                                 slave->dev->last_rx - delta_in_ticks,
2835                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2836
2837                                 slave->link  = BOND_LINK_DOWN;
2838                                 bond_set_backup_slave(slave);
2839
2840                                 if (slave->link_failure_count < UINT_MAX)
2841                                         slave->link_failure_count++;
2842
2843                                 pr_info("%s: interface %s is now down.\n",
2844                                         bond->dev->name,
2845                                         slave->dev->name);
2846
2847                                 if (slave == oldcurrent)
2848                                         do_failover = 1;
2849                         }
2850                 }
2851
2852                 /* note: if switch is in round-robin mode, all links
2853                  * must tx arp to ensure all links rx an arp - otherwise
2854                  * links may oscillate or not come up at all; if switch is
2855                  * in something like xor mode, there is nothing we can
2856                  * do - all replies will be rx'ed on same link causing slaves
2857                  * to be unstable during low/no traffic periods
2858                  */
2859                 if (IS_UP(slave->dev))
2860                         bond_arp_send_all(bond, slave);
2861         }
2862
2863         if (do_failover) {
2864                 block_netpoll_tx();
2865                 write_lock_bh(&bond->curr_slave_lock);
2866
2867                 bond_select_active_slave(bond);
2868
2869                 write_unlock_bh(&bond->curr_slave_lock);
2870                 unblock_netpoll_tx();
2871         }
2872
2873 re_arm:
2874         if (bond->params.arp_interval)
2875                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2876
2877         read_unlock(&bond->lock);
2878 }
2879
2880 /*
2881  * Called to inspect slaves for active-backup mode ARP monitor link state
2882  * changes.  Sets new_link in slaves to specify what action should take
2883  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2884  * to link states must be committed.
2885  *
2886  * Called with bond->lock held for read.
2887  */
2888 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2889 {
2890         struct slave *slave;
2891         int i, commit = 0;
2892         unsigned long trans_start;
2893
2894         bond_for_each_slave(bond, slave, i) {
2895                 slave->new_link = BOND_LINK_NOCHANGE;
2896
2897                 if (slave->link != BOND_LINK_UP) {
2898                         if (time_in_range(jiffies,
2899                                 slave_last_rx(bond, slave) - delta_in_ticks,
2900                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2901
2902                                 slave->new_link = BOND_LINK_UP;
2903                                 commit++;
2904                         }
2905
2906                         continue;
2907                 }
2908
2909                 /*
2910                  * Give slaves 2*delta after being enslaved or made
2911                  * active.  This avoids bouncing, as the last receive
2912                  * times need a full ARP monitor cycle to be updated.
2913                  */
2914                 if (time_in_range(jiffies,
2915                                   slave->jiffies - delta_in_ticks,
2916                                   slave->jiffies + 2 * delta_in_ticks))
2917                         continue;
2918
2919                 /*
2920                  * Backup slave is down if:
2921                  * - No current_arp_slave AND
2922                  * - more than 3*delta since last receive AND
2923                  * - the bond has an IP address
2924                  *
2925                  * Note: a non-null current_arp_slave indicates
2926                  * the curr_active_slave went down and we are
2927                  * searching for a new one; under this condition
2928                  * we only take the curr_active_slave down - this
2929                  * gives each slave a chance to tx/rx traffic
2930                  * before being taken out
2931                  */
2932                 if (!bond_is_active_slave(slave) &&
2933                     !bond->current_arp_slave &&
2934                     !time_in_range(jiffies,
2935                         slave_last_rx(bond, slave) - delta_in_ticks,
2936                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2937
2938                         slave->new_link = BOND_LINK_DOWN;
2939                         commit++;
2940                 }
2941
2942                 /*
2943                  * Active slave is down if:
2944                  * - more than 2*delta since transmitting OR
2945                  * - (more than 2*delta since receive AND
2946                  *    the bond has an IP address)
2947                  */
2948                 trans_start = dev_trans_start(slave->dev);
2949                 if (bond_is_active_slave(slave) &&
2950                     (!time_in_range(jiffies,
2951                         trans_start - delta_in_ticks,
2952                         trans_start + 2 * delta_in_ticks) ||
2953                      !time_in_range(jiffies,
2954                         slave_last_rx(bond, slave) - delta_in_ticks,
2955                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2956
2957                         slave->new_link = BOND_LINK_DOWN;
2958                         commit++;
2959                 }
2960         }
2961
2962         return commit;
2963 }
2964
2965 /*
2966  * Called to commit link state changes noted by inspection step of
2967  * active-backup mode ARP monitor.
2968  *
2969  * Called with RTNL and bond->lock for read.
2970  */
2971 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2972 {
2973         struct slave *slave;
2974         int i;
2975         unsigned long trans_start;
2976
2977         bond_for_each_slave(bond, slave, i) {
2978                 switch (slave->new_link) {
2979                 case BOND_LINK_NOCHANGE:
2980                         continue;
2981
2982                 case BOND_LINK_UP:
2983                         trans_start = dev_trans_start(slave->dev);
2984                         if ((!bond->curr_active_slave &&
2985                              time_in_range(jiffies,
2986                                            trans_start - delta_in_ticks,
2987                                            trans_start + delta_in_ticks)) ||
2988                             bond->curr_active_slave != slave) {
2989                                 slave->link = BOND_LINK_UP;
2990                                 if (bond->current_arp_slave) {
2991                                         bond_set_slave_inactive_flags(
2992                                                 bond->current_arp_slave);
2993                                         bond->current_arp_slave = NULL;
2994                                 }
2995
2996                                 pr_info("%s: link status definitely up for interface %s.\n",
2997                                         bond->dev->name, slave->dev->name);
2998
2999                                 if (!bond->curr_active_slave ||
3000                                     (slave == bond->primary_slave))
3001                                         goto do_failover;
3002
3003                         }
3004
3005                         continue;
3006
3007                 case BOND_LINK_DOWN:
3008                         if (slave->link_failure_count < UINT_MAX)
3009                                 slave->link_failure_count++;
3010
3011                         slave->link = BOND_LINK_DOWN;
3012                         bond_set_slave_inactive_flags(slave);
3013
3014                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3015                                 bond->dev->name, slave->dev->name);
3016
3017                         if (slave == bond->curr_active_slave) {
3018                                 bond->current_arp_slave = NULL;
3019                                 goto do_failover;
3020                         }
3021
3022                         continue;
3023
3024                 default:
3025                         pr_err("%s: impossible: new_link %d on slave %s\n",
3026                                bond->dev->name, slave->new_link,
3027                                slave->dev->name);
3028                         continue;
3029                 }
3030
3031 do_failover:
3032                 ASSERT_RTNL();
3033                 block_netpoll_tx();
3034                 write_lock_bh(&bond->curr_slave_lock);
3035                 bond_select_active_slave(bond);
3036                 write_unlock_bh(&bond->curr_slave_lock);
3037                 unblock_netpoll_tx();
3038         }
3039
3040         bond_set_carrier(bond);
3041 }
3042
3043 /*
3044  * Send ARP probes for active-backup mode ARP monitor.
3045  *
3046  * Called with bond->lock held for read.
3047  */
3048 static void bond_ab_arp_probe(struct bonding *bond)
3049 {
3050         struct slave *slave;
3051         int i;
3052
3053         read_lock(&bond->curr_slave_lock);
3054
3055         if (bond->current_arp_slave && bond->curr_active_slave)
3056                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3057                         bond->current_arp_slave->dev->name,
3058                         bond->curr_active_slave->dev->name);
3059
3060         if (bond->curr_active_slave) {
3061                 bond_arp_send_all(bond, bond->curr_active_slave);
3062                 read_unlock(&bond->curr_slave_lock);
3063                 return;
3064         }
3065
3066         read_unlock(&bond->curr_slave_lock);
3067
3068         /* if we don't have a curr_active_slave, search for the next available
3069          * backup slave from the current_arp_slave and make it the candidate
3070          * for becoming the curr_active_slave
3071          */
3072
3073         if (!bond->current_arp_slave) {
3074                 bond->current_arp_slave = bond->first_slave;
3075                 if (!bond->current_arp_slave)
3076                         return;
3077         }
3078
3079         bond_set_slave_inactive_flags(bond->current_arp_slave);
3080
3081         /* search for next candidate */
3082         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3083                 if (IS_UP(slave->dev)) {
3084                         slave->link = BOND_LINK_BACK;
3085                         bond_set_slave_active_flags(slave);
3086                         bond_arp_send_all(bond, slave);
3087                         slave->jiffies = jiffies;
3088                         bond->current_arp_slave = slave;
3089                         break;
3090                 }
3091
3092                 /* if the link state is up at this point, we
3093                  * mark it down - this can happen if we have
3094                  * simultaneous link failures and
3095                  * reselect_active_interface doesn't make this
3096                  * one the current slave so it is still marked
3097                  * up when it is actually down
3098                  */
3099                 if (slave->link == BOND_LINK_UP) {
3100                         slave->link = BOND_LINK_DOWN;
3101                         if (slave->link_failure_count < UINT_MAX)
3102                                 slave->link_failure_count++;
3103
3104                         bond_set_slave_inactive_flags(slave);
3105
3106                         pr_info("%s: backup interface %s is now down.\n",
3107                                 bond->dev->name, slave->dev->name);
3108                 }
3109         }
3110 }
3111
3112 void bond_activebackup_arp_mon(struct work_struct *work)
3113 {
3114         struct bonding *bond = container_of(work, struct bonding,
3115                                             arp_work.work);
3116         bool should_notify_peers = false;
3117         int delta_in_ticks;
3118
3119         read_lock(&bond->lock);
3120
3121         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3122
3123         if (bond->slave_cnt == 0)
3124                 goto re_arm;
3125
3126         should_notify_peers = bond_should_notify_peers(bond);
3127
3128         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3129                 read_unlock(&bond->lock);
3130
3131                 /* Race avoidance with bond_close flush of workqueue */
3132                 if (!rtnl_trylock()) {
3133                         read_lock(&bond->lock);
3134                         delta_in_ticks = 1;
3135                         should_notify_peers = false;
3136                         goto re_arm;
3137                 }
3138
3139                 read_lock(&bond->lock);
3140
3141                 bond_ab_arp_commit(bond, delta_in_ticks);
3142
3143                 read_unlock(&bond->lock);
3144                 rtnl_unlock();
3145                 read_lock(&bond->lock);
3146         }
3147
3148         bond_ab_arp_probe(bond);
3149
3150 re_arm:
3151         if (bond->params.arp_interval)
3152                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3153
3154         read_unlock(&bond->lock);
3155
3156         if (should_notify_peers) {
3157                 if (!rtnl_trylock()) {
3158                         read_lock(&bond->lock);
3159                         bond->send_peer_notif++;
3160                         read_unlock(&bond->lock);
3161                         return;
3162                 }
3163                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
3164                 rtnl_unlock();
3165         }
3166 }
3167
3168 /*-------------------------- netdev event handling --------------------------*/
3169
3170 /*
3171  * Change device name
3172  */
3173 static int bond_event_changename(struct bonding *bond)
3174 {
3175         bond_remove_proc_entry(bond);
3176         bond_create_proc_entry(bond);
3177
3178         bond_debug_reregister(bond);
3179
3180         return NOTIFY_DONE;
3181 }
3182
3183 static int bond_master_netdev_event(unsigned long event,
3184                                     struct net_device *bond_dev)
3185 {
3186         struct bonding *event_bond = netdev_priv(bond_dev);
3187
3188         switch (event) {
3189         case NETDEV_CHANGENAME:
3190                 return bond_event_changename(event_bond);
3191         case NETDEV_UNREGISTER:
3192                 bond_remove_proc_entry(event_bond);
3193                 break;
3194         case NETDEV_REGISTER:
3195                 bond_create_proc_entry(event_bond);
3196                 break;
3197         default:
3198                 break;
3199         }
3200
3201         return NOTIFY_DONE;
3202 }
3203
3204 static int bond_slave_netdev_event(unsigned long event,
3205                                    struct net_device *slave_dev)
3206 {
3207         struct net_device *bond_dev = slave_dev->master;
3208         struct bonding *bond = netdev_priv(bond_dev);
3209         struct slave *slave = NULL;
3210
3211         switch (event) {
3212         case NETDEV_UNREGISTER:
3213                 if (bond_dev) {
3214                         if (bond->setup_by_slave)
3215                                 bond_release_and_destroy(bond_dev, slave_dev);
3216                         else
3217                                 bond_release(bond_dev, slave_dev);
3218                 }
3219                 break;
3220         case NETDEV_UP:
3221         case NETDEV_CHANGE:
3222                 slave = bond_get_slave_by_dev(bond, slave_dev);
3223                 if (slave) {
3224                         u32 old_speed = slave->speed;
3225                         u8  old_duplex = slave->duplex;
3226
3227                         bond_update_speed_duplex(slave);
3228
3229                         if (bond->params.mode == BOND_MODE_8023AD) {
3230                                 if (old_speed != slave->speed)
3231                                         bond_3ad_adapter_speed_changed(slave);
3232                                 if (old_duplex != slave->duplex)
3233                                         bond_3ad_adapter_duplex_changed(slave);
3234                         }
3235                 }
3236
3237                 break;
3238         case NETDEV_DOWN:
3239                 /*
3240                  * ... Or is it this?
3241                  */
3242                 break;
3243         case NETDEV_CHANGEMTU:
3244                 /*
3245                  * TODO: Should slaves be allowed to
3246                  * independently alter their MTU?  For
3247                  * an active-backup bond, slaves need
3248                  * not be the same type of device, so
3249                  * MTUs may vary.  For other modes,
3250                  * slaves arguably should have the
3251                  * same MTUs. To do this, we'd need to
3252                  * take over the slave's change_mtu
3253                  * function for the duration of their
3254                  * servitude.
3255                  */
3256                 break;
3257         case NETDEV_CHANGENAME:
3258                 /*
3259                  * TODO: handle changing the primary's name
3260                  */
3261                 break;
3262         case NETDEV_FEAT_CHANGE:
3263                 bond_compute_features(bond);
3264                 break;
3265         default:
3266                 break;
3267         }
3268
3269         return NOTIFY_DONE;
3270 }
3271
3272 /*
3273  * bond_netdev_event: handle netdev notifier chain events.
3274  *
3275  * This function receives events for the netdev chain.  The caller (an
3276  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3277  * locks for us to safely manipulate the slave devices (RTNL lock,
3278  * dev_probe_lock).
3279  */
3280 static int bond_netdev_event(struct notifier_block *this,
3281                              unsigned long event, void *ptr)
3282 {
3283         struct net_device *event_dev = (struct net_device *)ptr;
3284
3285         pr_debug("event_dev: %s, event: %lx\n",
3286                  event_dev ? event_dev->name : "None",
3287                  event);
3288
3289         if (!(event_dev->priv_flags & IFF_BONDING))
3290                 return NOTIFY_DONE;
3291
3292         if (event_dev->flags & IFF_MASTER) {
3293                 pr_debug("IFF_MASTER\n");
3294                 return bond_master_netdev_event(event, event_dev);
3295         }
3296
3297         if (event_dev->flags & IFF_SLAVE) {
3298                 pr_debug("IFF_SLAVE\n");
3299                 return bond_slave_netdev_event(event, event_dev);
3300         }
3301
3302         return NOTIFY_DONE;
3303 }
3304
3305 /*
3306  * bond_inetaddr_event: handle inetaddr notifier chain events.
3307  *
3308  * We keep track of device IPs primarily to use as source addresses in
3309  * ARP monitor probes (rather than spewing out broadcasts all the time).
3310  *
3311  * We track one IP for the main device (if it has one), plus one per VLAN.
3312  */
3313 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3314 {
3315         struct in_ifaddr *ifa = ptr;
3316         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3317         struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3318         struct bonding *bond;
3319         struct vlan_entry *vlan;
3320
3321         /* we only care about primary address */
3322         if(ifa->ifa_flags & IFA_F_SECONDARY)
3323                 return NOTIFY_DONE;
3324
3325         list_for_each_entry(bond, &bn->dev_list, bond_list) {
3326                 if (bond->dev == event_dev) {
3327                         switch (event) {
3328                         case NETDEV_UP:
3329                                 bond->master_ip = ifa->ifa_local;
3330                                 return NOTIFY_OK;
3331                         case NETDEV_DOWN:
3332                                 bond->master_ip = 0;
3333                                 return NOTIFY_OK;
3334                         default:
3335                                 return NOTIFY_DONE;
3336                         }
3337                 }
3338
3339                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3340                         vlan_dev = __vlan_find_dev_deep(bond->dev,
3341                                                         vlan->vlan_id);
3342                         if (vlan_dev == event_dev) {
3343                                 switch (event) {
3344                                 case NETDEV_UP:
3345                                         vlan->vlan_ip = ifa->ifa_local;
3346                                         return NOTIFY_OK;
3347                                 case NETDEV_DOWN:
3348                                         vlan->vlan_ip = 0;
3349                                         return NOTIFY_OK;
3350                                 default:
3351                                         return NOTIFY_DONE;
3352                                 }
3353                         }
3354                 }
3355         }
3356         return NOTIFY_DONE;
3357 }
3358
3359 static struct notifier_block bond_netdev_notifier = {
3360         .notifier_call = bond_netdev_event,
3361 };
3362
3363 static struct notifier_block bond_inetaddr_notifier = {
3364         .notifier_call = bond_inetaddr_event,
3365 };
3366
3367 /*---------------------------- Hashing Policies -----------------------------*/
3368
3369 /*
3370  * Hash for the output device based upon layer 2 and layer 3 data. If
3371  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3372  */
3373 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3374 {
3375         struct ethhdr *data = (struct ethhdr *)skb->data;
3376         struct iphdr *iph = ip_hdr(skb);
3377
3378         if (skb->protocol == htons(ETH_P_IP)) {
3379                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3380                         (data->h_dest[5] ^ data->h_source[5])) % count;
3381         }
3382
3383         return (data->h_dest[5] ^ data->h_source[5]) % count;
3384 }
3385
3386 /*
3387  * Hash for the output device based upon layer 3 and layer 4 data. If
3388  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3389  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3390  */
3391 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3392 {
3393         struct ethhdr *data = (struct ethhdr *)skb->data;
3394         struct iphdr *iph = ip_hdr(skb);
3395         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3396         int layer4_xor = 0;
3397
3398         if (skb->protocol == htons(ETH_P_IP)) {
3399                 if (!ip_is_fragment(iph) &&
3400                     (iph->protocol == IPPROTO_TCP ||
3401                      iph->protocol == IPPROTO_UDP)) {
3402                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3403                 }
3404                 return (layer4_xor ^
3405                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3406
3407         }
3408
3409         return (data->h_dest[5] ^ data->h_source[5]) % count;
3410 }
3411
3412 /*
3413  * Hash for the output device based upon layer 2 data
3414  */
3415 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3416 {
3417         struct ethhdr *data = (struct ethhdr *)skb->data;
3418
3419         return (data->h_dest[5] ^ data->h_source[5]) % count;
3420 }
3421
3422 /*-------------------------- Device entry points ----------------------------*/
3423
3424 static void bond_work_init_all(struct bonding *bond)
3425 {
3426         INIT_DELAYED_WORK(&bond->mcast_work,
3427                           bond_resend_igmp_join_requests_delayed);
3428         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3429         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3430         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3431                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3432         else
3433                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3434         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3435 }
3436
3437 static void bond_work_cancel_all(struct bonding *bond)
3438 {
3439         cancel_delayed_work_sync(&bond->mii_work);
3440         cancel_delayed_work_sync(&bond->arp_work);
3441         cancel_delayed_work_sync(&bond->alb_work);
3442         cancel_delayed_work_sync(&bond->ad_work);
3443         cancel_delayed_work_sync(&bond->mcast_work);
3444 }
3445
3446 static int bond_open(struct net_device *bond_dev)
3447 {
3448         struct bonding *bond = netdev_priv(bond_dev);
3449         struct slave *slave;
3450         int i;
3451
3452         /* reset slave->backup and slave->inactive */
3453         read_lock(&bond->lock);
3454         if (bond->slave_cnt > 0) {
3455                 read_lock(&bond->curr_slave_lock);
3456                 bond_for_each_slave(bond, slave, i) {
3457                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3458                                 && (slave != bond->curr_active_slave)) {
3459                                 bond_set_slave_inactive_flags(slave);
3460                         } else {
3461                                 bond_set_slave_active_flags(slave);
3462                         }
3463                 }
3464                 read_unlock(&bond->curr_slave_lock);
3465         }
3466         read_unlock(&bond->lock);
3467
3468         bond_work_init_all(bond);
3469
3470         if (bond_is_lb(bond)) {
3471                 /* bond_alb_initialize must be called before the timer
3472                  * is started.
3473                  */
3474                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3475                         return -ENOMEM;
3476                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3477         }
3478
3479         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3480                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3481
3482         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3483                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3484                 if (bond->params.arp_validate)
3485                         bond->recv_probe = bond_arp_rcv;
3486         }
3487
3488         if (bond->params.mode == BOND_MODE_8023AD) {
3489                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3490                 /* register to receive LACPDUs */
3491                 bond->recv_probe = bond_3ad_lacpdu_recv;
3492                 bond_3ad_initiate_agg_selection(bond, 1);
3493         }
3494
3495         return 0;
3496 }
3497
3498 static int bond_close(struct net_device *bond_dev)
3499 {
3500         struct bonding *bond = netdev_priv(bond_dev);
3501
3502         write_lock_bh(&bond->lock);
3503         bond->send_peer_notif = 0;
3504         write_unlock_bh(&bond->lock);
3505
3506         bond_work_cancel_all(bond);
3507         if (bond_is_lb(bond)) {
3508                 /* Must be called only after all
3509                  * slaves have been released
3510                  */
3511                 bond_alb_deinitialize(bond);
3512         }
3513         bond->recv_probe = NULL;
3514
3515         return 0;
3516 }
3517
3518 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3519                                                 struct rtnl_link_stats64 *stats)
3520 {
3521         struct bonding *bond = netdev_priv(bond_dev);
3522         struct rtnl_link_stats64 temp;
3523         struct slave *slave;
3524         int i;
3525
3526         memset(stats, 0, sizeof(*stats));
3527
3528         read_lock_bh(&bond->lock);
3529
3530         bond_for_each_slave(bond, slave, i) {
3531                 const struct rtnl_link_stats64 *sstats =
3532                         dev_get_stats(slave->dev, &temp);
3533
3534                 stats->rx_packets += sstats->rx_packets;
3535                 stats->rx_bytes += sstats->rx_bytes;
3536                 stats->rx_errors += sstats->rx_errors;
3537                 stats->rx_dropped += sstats->rx_dropped;
3538
3539                 stats->tx_packets += sstats->tx_packets;
3540                 stats->tx_bytes += sstats->tx_bytes;
3541                 stats->tx_errors += sstats->tx_errors;
3542                 stats->tx_dropped += sstats->tx_dropped;
3543
3544                 stats->multicast += sstats->multicast;
3545                 stats->collisions += sstats->collisions;
3546
3547                 stats->rx_length_errors += sstats->rx_length_errors;
3548                 stats->rx_over_errors += sstats->rx_over_errors;
3549                 stats->rx_crc_errors += sstats->rx_crc_errors;
3550                 stats->rx_frame_errors += sstats->rx_frame_errors;
3551                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3552                 stats->rx_missed_errors += sstats->rx_missed_errors;
3553
3554                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3555                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3556                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3557                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3558                 stats->tx_window_errors += sstats->tx_window_errors;
3559         }
3560
3561         read_unlock_bh(&bond->lock);
3562
3563         return stats;
3564 }
3565
3566 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3567 {
3568         struct net_device *slave_dev = NULL;
3569         struct ifbond k_binfo;
3570         struct ifbond __user *u_binfo = NULL;
3571         struct ifslave k_sinfo;
3572         struct ifslave __user *u_sinfo = NULL;
3573         struct mii_ioctl_data *mii = NULL;
3574         int res = 0;
3575
3576         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3577
3578         switch (cmd) {
3579         case SIOCGMIIPHY:
3580                 mii = if_mii(ifr);
3581                 if (!mii)
3582                         return -EINVAL;
3583
3584                 mii->phy_id = 0;
3585                 /* Fall Through */
3586         case SIOCGMIIREG:
3587                 /*
3588                  * We do this again just in case we were called by SIOCGMIIREG
3589                  * instead of SIOCGMIIPHY.
3590                  */
3591                 mii = if_mii(ifr);
3592                 if (!mii)
3593                         return -EINVAL;
3594
3595
3596                 if (mii->reg_num == 1) {
3597                         struct bonding *bond = netdev_priv(bond_dev);
3598                         mii->val_out = 0;
3599                         read_lock(&bond->lock);
3600                         read_lock(&bond->curr_slave_lock);
3601                         if (netif_carrier_ok(bond->dev))
3602                                 mii->val_out = BMSR_LSTATUS;
3603
3604                         read_unlock(&bond->curr_slave_lock);
3605                         read_unlock(&bond->lock);
3606                 }
3607
3608                 return 0;
3609         case BOND_INFO_QUERY_OLD:
3610         case SIOCBONDINFOQUERY:
3611                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3612
3613                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3614                         return -EFAULT;
3615
3616                 res = bond_info_query(bond_dev, &k_binfo);
3617                 if (res == 0 &&
3618                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3619                         return -EFAULT;
3620
3621                 return res;
3622         case BOND_SLAVE_INFO_QUERY_OLD:
3623         case SIOCBONDSLAVEINFOQUERY:
3624                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3625
3626                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3627                         return -EFAULT;
3628
3629                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3630                 if (res == 0 &&
3631                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3632                         return -EFAULT;
3633
3634                 return res;
3635         default:
3636                 /* Go on */
3637                 break;
3638         }
3639
3640         if (!capable(CAP_NET_ADMIN))
3641                 return -EPERM;
3642
3643         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3644
3645         pr_debug("slave_dev=%p:\n", slave_dev);
3646
3647         if (!slave_dev)
3648                 res = -ENODEV;
3649         else {
3650                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3651                 switch (cmd) {
3652                 case BOND_ENSLAVE_OLD:
3653                 case SIOCBONDENSLAVE:
3654                         res = bond_enslave(bond_dev, slave_dev);
3655                         break;
3656                 case BOND_RELEASE_OLD:
3657                 case SIOCBONDRELEASE:
3658                         res = bond_release(bond_dev, slave_dev);
3659                         break;
3660                 case BOND_SETHWADDR_OLD:
3661                 case SIOCBONDSETHWADDR:
3662                         res = bond_sethwaddr(bond_dev, slave_dev);
3663                         break;
3664                 case BOND_CHANGE_ACTIVE_OLD:
3665                 case SIOCBONDCHANGEACTIVE:
3666                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3667                         break;
3668                 default:
3669                         res = -EOPNOTSUPP;
3670                 }
3671
3672                 dev_put(slave_dev);
3673         }
3674
3675         return res;
3676 }
3677
3678 static bool bond_addr_in_mc_list(unsigned char *addr,
3679                                  struct netdev_hw_addr_list *list,
3680                                  int addrlen)
3681 {
3682         struct netdev_hw_addr *ha;
3683
3684         netdev_hw_addr_list_for_each(ha, list)
3685                 if (!memcmp(ha->addr, addr, addrlen))
3686                         return true;
3687
3688         return false;
3689 }
3690
3691 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3692 {
3693         struct bonding *bond = netdev_priv(bond_dev);
3694
3695         if (change & IFF_PROMISC)
3696                 bond_set_promiscuity(bond,
3697                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3698
3699         if (change & IFF_ALLMULTI)
3700                 bond_set_allmulti(bond,
3701                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3702 }
3703
3704 static void bond_set_multicast_list(struct net_device *bond_dev)
3705 {
3706         struct bonding *bond = netdev_priv(bond_dev);
3707         struct netdev_hw_addr *ha;
3708         bool found;
3709
3710         read_lock(&bond->lock);
3711
3712         /* looking for addresses to add to slaves' mc list */
3713         netdev_for_each_mc_addr(ha, bond_dev) {
3714                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3715                                              bond_dev->addr_len);
3716                 if (!found)
3717                         bond_mc_add(bond, ha->addr);
3718         }
3719
3720         /* looking for addresses to delete from slaves' list */
3721         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3722                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3723                                              bond_dev->addr_len);
3724                 if (!found)
3725                         bond_mc_del(bond, ha->addr);
3726         }
3727
3728         /* save master's multicast list */
3729         __hw_addr_flush(&bond->mc_list);
3730         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3731                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3732
3733         read_unlock(&bond->lock);
3734 }
3735
3736 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
3737 {
3738         struct bonding *bond = netdev_priv(dev);
3739         struct slave *slave = bond->first_slave;
3740
3741         if (slave) {
3742                 const struct net_device_ops *slave_ops
3743                         = slave->dev->netdev_ops;
3744                 if (slave_ops->ndo_neigh_setup)
3745                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
3746         }
3747         return 0;
3748 }
3749
3750 /*
3751  * Change the MTU of all of a master's slaves to match the master
3752  */
3753 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3754 {
3755         struct bonding *bond = netdev_priv(bond_dev);
3756         struct slave *slave, *stop_at;
3757         int res = 0;
3758         int i;
3759
3760         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3761                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3762
3763         /* Can't hold bond->lock with bh disabled here since
3764          * some base drivers panic. On the other hand we can't
3765          * hold bond->lock without bh disabled because we'll
3766          * deadlock. The only solution is to rely on the fact
3767          * that we're under rtnl_lock here, and the slaves
3768          * list won't change. This doesn't solve the problem
3769          * of setting the slave's MTU while it is
3770          * transmitting, but the assumption is that the base
3771          * driver can handle that.
3772          *
3773          * TODO: figure out a way to safely iterate the slaves
3774          * list, but without holding a lock around the actual
3775          * call to the base driver.
3776          */
3777
3778         bond_for_each_slave(bond, slave, i) {
3779                 pr_debug("s %p s->p %p c_m %p\n",
3780                          slave,
3781                          slave->prev,
3782                          slave->dev->netdev_ops->ndo_change_mtu);
3783
3784                 res = dev_set_mtu(slave->dev, new_mtu);
3785
3786                 if (res) {
3787                         /* If we failed to set the slave's mtu to the new value
3788                          * we must abort the operation even in ACTIVE_BACKUP
3789                          * mode, because if we allow the backup slaves to have
3790                          * different mtu values than the active slave we'll
3791                          * need to change their mtu when doing a failover. That
3792                          * means changing their mtu from timer context, which
3793                          * is probably not a good idea.
3794                          */
3795                         pr_debug("err %d %s\n", res, slave->dev->name);
3796                         goto unwind;
3797                 }
3798         }
3799
3800         bond_dev->mtu = new_mtu;
3801
3802         return 0;
3803
3804 unwind:
3805         /* unwind from head to the slave that failed */
3806         stop_at = slave;
3807         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3808                 int tmp_res;
3809
3810                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3811                 if (tmp_res) {
3812                         pr_debug("unwind err %d dev %s\n",
3813                                  tmp_res, slave->dev->name);
3814                 }
3815         }
3816
3817         return res;
3818 }
3819
3820 /*
3821  * Change HW address
3822  *
3823  * Note that many devices must be down to change the HW address, and
3824  * downing the master releases all slaves.  We can make bonds full of
3825  * bonding devices to test this, however.
3826  */
3827 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3828 {
3829         struct bonding *bond = netdev_priv(bond_dev);
3830         struct sockaddr *sa = addr, tmp_sa;
3831         struct slave *slave, *stop_at;
3832         int res = 0;
3833         int i;
3834
3835         if (bond->params.mode == BOND_MODE_ALB)
3836                 return bond_alb_set_mac_address(bond_dev, addr);
3837
3838
3839         pr_debug("bond=%p, name=%s\n",
3840                  bond, bond_dev ? bond_dev->name : "None");
3841
3842         /*
3843          * If fail_over_mac is set to active, do nothing and return
3844          * success.  Returning an error causes ifenslave to fail.
3845          */
3846         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3847                 return 0;
3848
3849         if (!is_valid_ether_addr(sa->sa_data))
3850                 return -EADDRNOTAVAIL;
3851
3852         /* Can't hold bond->lock with bh disabled here since
3853          * some base drivers panic. On the other hand we can't
3854          * hold bond->lock without bh disabled because we'll
3855          * deadlock. The only solution is to rely on the fact
3856          * that we're under rtnl_lock here, and the slaves
3857          * list won't change. This doesn't solve the problem
3858          * of setting the slave's hw address while it is
3859          * transmitting, but the assumption is that the base
3860          * driver can handle that.
3861          *
3862          * TODO: figure out a way to safely iterate the slaves
3863          * list, but without holding a lock around the actual
3864          * call to the base driver.
3865          */
3866
3867         bond_for_each_slave(bond, slave, i) {
3868                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3869                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3870
3871                 if (slave_ops->ndo_set_mac_address == NULL) {
3872                         res = -EOPNOTSUPP;
3873                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3874                         goto unwind;
3875                 }
3876
3877                 res = dev_set_mac_address(slave->dev, addr);
3878                 if (res) {
3879                         /* TODO: consider downing the slave
3880                          * and retry ?
3881                          * User should expect communications
3882                          * breakage anyway until ARP finish
3883                          * updating, so...
3884                          */
3885                         pr_debug("err %d %s\n", res, slave->dev->name);
3886                         goto unwind;
3887                 }
3888         }
3889
3890         /* success */
3891         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3892         return 0;
3893
3894 unwind:
3895         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3896         tmp_sa.sa_family = bond_dev->type;
3897
3898         /* unwind from head to the slave that failed */
3899         stop_at = slave;
3900         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3901                 int tmp_res;
3902
3903                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3904                 if (tmp_res) {
3905                         pr_debug("unwind err %d dev %s\n",
3906                                  tmp_res, slave->dev->name);
3907                 }
3908         }
3909
3910         return res;
3911 }
3912
3913 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3914 {
3915         struct bonding *bond = netdev_priv(bond_dev);
3916         struct slave *slave, *start_at;
3917         int i, slave_no, res = 1;
3918         struct iphdr *iph = ip_hdr(skb);
3919
3920         /*
3921          * Start with the curr_active_slave that joined the bond as the
3922          * default for sending IGMP traffic.  For failover purposes one
3923          * needs to maintain some consistency for the interface that will
3924          * send the join/membership reports.  The curr_active_slave found
3925          * will send all of this type of traffic.
3926          */
3927         if ((iph->protocol == IPPROTO_IGMP) &&
3928             (skb->protocol == htons(ETH_P_IP))) {
3929
3930                 read_lock(&bond->curr_slave_lock);
3931                 slave = bond->curr_active_slave;
3932                 read_unlock(&bond->curr_slave_lock);
3933
3934                 if (!slave)
3935                         goto out;
3936         } else {
3937                 /*
3938                  * Concurrent TX may collide on rr_tx_counter; we accept
3939                  * that as being rare enough not to justify using an
3940                  * atomic op here.
3941                  */
3942                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3943
3944                 bond_for_each_slave(bond, slave, i) {
3945                         slave_no--;
3946                         if (slave_no < 0)
3947                                 break;
3948                 }
3949         }
3950
3951         start_at = slave;
3952         bond_for_each_slave_from(bond, slave, i, start_at) {
3953                 if (IS_UP(slave->dev) &&
3954                     (slave->link == BOND_LINK_UP) &&
3955                     bond_is_active_slave(slave)) {
3956                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3957                         break;
3958                 }
3959         }
3960
3961 out:
3962         if (res) {
3963                 /* no suitable interface, frame not sent */
3964                 dev_kfree_skb(skb);
3965         }
3966
3967         return NETDEV_TX_OK;
3968 }
3969
3970
3971 /*
3972  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3973  * the bond has a usable interface.
3974  */
3975 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3976 {
3977         struct bonding *bond = netdev_priv(bond_dev);
3978         int res = 1;
3979
3980         read_lock(&bond->curr_slave_lock);
3981
3982         if (bond->curr_active_slave)
3983                 res = bond_dev_queue_xmit(bond, skb,
3984                         bond->curr_active_slave->dev);
3985
3986         if (res)
3987                 /* no suitable interface, frame not sent */
3988                 dev_kfree_skb(skb);
3989
3990         read_unlock(&bond->curr_slave_lock);
3991
3992         return NETDEV_TX_OK;
3993 }
3994
3995 /*
3996  * In bond_xmit_xor() , we determine the output device by using a pre-
3997  * determined xmit_hash_policy(), If the selected device is not enabled,
3998  * find the next active slave.
3999  */
4000 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4001 {
4002         struct bonding *bond = netdev_priv(bond_dev);
4003         struct slave *slave, *start_at;
4004         int slave_no;
4005         int i;
4006         int res = 1;
4007
4008         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4009
4010         bond_for_each_slave(bond, slave, i) {
4011                 slave_no--;
4012                 if (slave_no < 0)
4013                         break;
4014         }
4015
4016         start_at = slave;
4017
4018         bond_for_each_slave_from(bond, slave, i, start_at) {
4019                 if (IS_UP(slave->dev) &&
4020                     (slave->link == BOND_LINK_UP) &&
4021                     bond_is_active_slave(slave)) {
4022                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4023                         break;
4024                 }
4025         }
4026
4027         if (res) {
4028                 /* no suitable interface, frame not sent */
4029                 dev_kfree_skb(skb);
4030         }
4031
4032         return NETDEV_TX_OK;
4033 }
4034
4035 /*
4036  * in broadcast mode, we send everything to all usable interfaces.
4037  */
4038 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4039 {
4040         struct bonding *bond = netdev_priv(bond_dev);
4041         struct slave *slave, *start_at;
4042         struct net_device *tx_dev = NULL;
4043         int i;
4044         int res = 1;
4045
4046         read_lock(&bond->curr_slave_lock);
4047         start_at = bond->curr_active_slave;
4048         read_unlock(&bond->curr_slave_lock);
4049
4050         if (!start_at)
4051                 goto out;
4052
4053         bond_for_each_slave_from(bond, slave, i, start_at) {
4054                 if (IS_UP(slave->dev) &&
4055                     (slave->link == BOND_LINK_UP) &&
4056                     bond_is_active_slave(slave)) {
4057                         if (tx_dev) {
4058                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4059                                 if (!skb2) {
4060                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4061                                                bond_dev->name);
4062                                         continue;
4063                                 }
4064
4065                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4066                                 if (res) {
4067                                         dev_kfree_skb(skb2);
4068                                         continue;
4069                                 }
4070                         }
4071                         tx_dev = slave->dev;
4072                 }
4073         }
4074
4075         if (tx_dev)
4076                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4077
4078 out:
4079         if (res)
4080                 /* no suitable interface, frame not sent */
4081                 dev_kfree_skb(skb);
4082
4083         /* frame sent to all suitable interfaces */
4084         return NETDEV_TX_OK;
4085 }
4086
4087 /*------------------------- Device initialization ---------------------------*/
4088
4089 static void bond_set_xmit_hash_policy(struct bonding *bond)
4090 {
4091         switch (bond->params.xmit_policy) {
4092         case BOND_XMIT_POLICY_LAYER23:
4093                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4094                 break;
4095         case BOND_XMIT_POLICY_LAYER34:
4096                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4097                 break;
4098         case BOND_XMIT_POLICY_LAYER2:
4099         default:
4100                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4101                 break;
4102         }
4103 }
4104
4105 /*
4106  * Lookup the slave that corresponds to a qid
4107  */
4108 static inline int bond_slave_override(struct bonding *bond,
4109                                       struct sk_buff *skb)
4110 {
4111         int i, res = 1;
4112         struct slave *slave = NULL;
4113         struct slave *check_slave;
4114
4115         if (!skb->queue_mapping)
4116                 return 1;
4117
4118         /* Find out if any slaves have the same mapping as this skb. */
4119         bond_for_each_slave(bond, check_slave, i) {
4120                 if (check_slave->queue_id == skb->queue_mapping) {
4121                         slave = check_slave;
4122                         break;
4123                 }
4124         }
4125
4126         /* If the slave isn't UP, use default transmit policy. */
4127         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4128             (slave->link == BOND_LINK_UP)) {
4129                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4130         }
4131
4132         return res;
4133 }
4134
4135
4136 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4137 {
4138         /*
4139          * This helper function exists to help dev_pick_tx get the correct
4140          * destination queue.  Using a helper function skips a call to
4141          * skb_tx_hash and will put the skbs in the queue we expect on their
4142          * way down to the bonding driver.
4143          */
4144         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4145
4146         /*
4147          * Save the original txq to restore before passing to the driver
4148          */
4149         qdisc_skb_cb(skb)->bond_queue_mapping = skb->queue_mapping;
4150
4151         if (unlikely(txq >= dev->real_num_tx_queues)) {
4152                 do {
4153                         txq -= dev->real_num_tx_queues;
4154                 } while (txq >= dev->real_num_tx_queues);
4155         }
4156         return txq;
4157 }
4158
4159 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4160 {
4161         struct bonding *bond = netdev_priv(dev);
4162
4163         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4164                 if (!bond_slave_override(bond, skb))
4165                         return NETDEV_TX_OK;
4166         }
4167
4168         switch (bond->params.mode) {
4169         case BOND_MODE_ROUNDROBIN:
4170                 return bond_xmit_roundrobin(skb, dev);
4171         case BOND_MODE_ACTIVEBACKUP:
4172                 return bond_xmit_activebackup(skb, dev);
4173         case BOND_MODE_XOR:
4174                 return bond_xmit_xor(skb, dev);
4175         case BOND_MODE_BROADCAST:
4176                 return bond_xmit_broadcast(skb, dev);
4177         case BOND_MODE_8023AD:
4178                 return bond_3ad_xmit_xor(skb, dev);
4179         case BOND_MODE_ALB:
4180         case BOND_MODE_TLB:
4181                 return bond_alb_xmit(skb, dev);
4182         default:
4183                 /* Should never happen, mode already checked */
4184                 pr_err("%s: Error: Unknown bonding mode %d\n",
4185                        dev->name, bond->params.mode);
4186                 WARN_ON_ONCE(1);
4187                 dev_kfree_skb(skb);
4188                 return NETDEV_TX_OK;
4189         }
4190 }
4191
4192 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4193 {
4194         struct bonding *bond = netdev_priv(dev);
4195         netdev_tx_t ret = NETDEV_TX_OK;
4196
4197         /*
4198          * If we risk deadlock from transmitting this in the
4199          * netpoll path, tell netpoll to queue the frame for later tx
4200          */
4201         if (is_netpoll_tx_blocked(dev))
4202                 return NETDEV_TX_BUSY;
4203
4204         read_lock(&bond->lock);
4205
4206         if (bond->slave_cnt)
4207                 ret = __bond_start_xmit(skb, dev);
4208         else
4209                 dev_kfree_skb(skb);
4210
4211         read_unlock(&bond->lock);
4212
4213         return ret;
4214 }
4215
4216 /*
4217  * set bond mode specific net device operations
4218  */
4219 void bond_set_mode_ops(struct bonding *bond, int mode)
4220 {
4221         struct net_device *bond_dev = bond->dev;
4222
4223         switch (mode) {
4224         case BOND_MODE_ROUNDROBIN:
4225                 break;
4226         case BOND_MODE_ACTIVEBACKUP:
4227                 break;
4228         case BOND_MODE_XOR:
4229                 bond_set_xmit_hash_policy(bond);
4230                 break;
4231         case BOND_MODE_BROADCAST:
4232                 break;
4233         case BOND_MODE_8023AD:
4234                 bond_set_xmit_hash_policy(bond);
4235                 break;
4236         case BOND_MODE_ALB:
4237                 /* FALLTHRU */
4238         case BOND_MODE_TLB:
4239                 break;
4240         default:
4241                 /* Should never happen, mode already checked */
4242                 pr_err("%s: Error: Unknown bonding mode %d\n",
4243                        bond_dev->name, mode);
4244                 break;
4245         }
4246 }
4247
4248 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4249                                     struct ethtool_drvinfo *drvinfo)
4250 {
4251         strncpy(drvinfo->driver, DRV_NAME, 32);
4252         strncpy(drvinfo->version, DRV_VERSION, 32);
4253         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4254 }
4255
4256 static const struct ethtool_ops bond_ethtool_ops = {
4257         .get_drvinfo            = bond_ethtool_get_drvinfo,
4258         .get_link               = ethtool_op_get_link,
4259 };
4260
4261 static const struct net_device_ops bond_netdev_ops = {
4262         .ndo_init               = bond_init,
4263         .ndo_uninit             = bond_uninit,
4264         .ndo_open               = bond_open,
4265         .ndo_stop               = bond_close,
4266         .ndo_start_xmit         = bond_start_xmit,
4267         .ndo_select_queue       = bond_select_queue,
4268         .ndo_get_stats64        = bond_get_stats,
4269         .ndo_do_ioctl           = bond_do_ioctl,
4270         .ndo_change_rx_flags    = bond_change_rx_flags,
4271         .ndo_set_rx_mode        = bond_set_multicast_list,
4272         .ndo_change_mtu         = bond_change_mtu,
4273         .ndo_set_mac_address    = bond_set_mac_address,
4274         .ndo_neigh_setup        = bond_neigh_setup,
4275         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4276         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4277 #ifdef CONFIG_NET_POLL_CONTROLLER
4278         .ndo_netpoll_setup      = bond_netpoll_setup,
4279         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4280         .ndo_poll_controller    = bond_poll_controller,
4281 #endif
4282         .ndo_add_slave          = bond_enslave,
4283         .ndo_del_slave          = bond_release,
4284         .ndo_fix_features       = bond_fix_features,
4285 };
4286
4287 static void bond_destructor(struct net_device *bond_dev)
4288 {
4289         struct bonding *bond = netdev_priv(bond_dev);
4290         if (bond->wq)
4291                 destroy_workqueue(bond->wq);
4292         free_netdev(bond_dev);
4293 }
4294
4295 static void bond_setup(struct net_device *bond_dev)
4296 {
4297         struct bonding *bond = netdev_priv(bond_dev);
4298
4299         /* initialize rwlocks */
4300         rwlock_init(&bond->lock);
4301         rwlock_init(&bond->curr_slave_lock);
4302
4303         bond->params = bonding_defaults;
4304
4305         /* Initialize pointers */
4306         bond->dev = bond_dev;
4307         INIT_LIST_HEAD(&bond->vlan_list);
4308
4309         /* Initialize the device entry points */
4310         ether_setup(bond_dev);
4311         bond_dev->netdev_ops = &bond_netdev_ops;
4312         bond_dev->ethtool_ops = &bond_ethtool_ops;
4313         bond_set_mode_ops(bond, bond->params.mode);
4314
4315         bond_dev->destructor = bond_destructor;
4316
4317         /* Initialize the device options */
4318         bond_dev->tx_queue_len = 0;
4319         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4320         bond_dev->priv_flags |= IFF_BONDING;
4321         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4322
4323         /* At first, we block adding VLANs. That's the only way to
4324          * prevent problems that occur when adding VLANs over an
4325          * empty bond. The block will be removed once non-challenged
4326          * slaves are enslaved.
4327          */
4328         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4329
4330         /* don't acquire bond device's netif_tx_lock when
4331          * transmitting */
4332         bond_dev->features |= NETIF_F_LLTX;
4333
4334         /* By default, we declare the bond to be fully
4335          * VLAN hardware accelerated capable. Special
4336          * care is taken in the various xmit functions
4337          * when there are slaves that are not hw accel
4338          * capable
4339          */
4340
4341         bond_dev->hw_features = BOND_VLAN_FEATURES |
4342                                 NETIF_F_HW_VLAN_TX |
4343                                 NETIF_F_HW_VLAN_RX |
4344                                 NETIF_F_HW_VLAN_FILTER;
4345
4346         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM);
4347         bond_dev->features |= bond_dev->hw_features;
4348 }
4349
4350 /*
4351 * Destroy a bonding device.
4352 * Must be under rtnl_lock when this function is called.
4353 */
4354 static void bond_uninit(struct net_device *bond_dev)
4355 {
4356         struct bonding *bond = netdev_priv(bond_dev);
4357         struct vlan_entry *vlan, *tmp;
4358
4359         bond_netpoll_cleanup(bond_dev);
4360
4361         /* Release the bonded slaves */
4362         bond_release_all(bond_dev);
4363
4364         list_del(&bond->bond_list);
4365
4366         bond_work_cancel_all(bond);
4367
4368         bond_debug_unregister(bond);
4369
4370         __hw_addr_flush(&bond->mc_list);
4371
4372         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4373                 list_del(&vlan->vlan_list);
4374                 kfree(vlan);
4375         }
4376 }
4377
4378 /*------------------------- Module initialization ---------------------------*/
4379
4380 /*
4381  * Convert string input module parms.  Accept either the
4382  * number of the mode or its string name.  A bit complicated because
4383  * some mode names are substrings of other names, and calls from sysfs
4384  * may have whitespace in the name (trailing newlines, for example).
4385  */
4386 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4387 {
4388         int modeint = -1, i, rv;
4389         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4390
4391         for (p = (char *)buf; *p; p++)
4392                 if (!(isdigit(*p) || isspace(*p)))
4393                         break;
4394
4395         if (*p)
4396                 rv = sscanf(buf, "%20s", modestr);
4397         else
4398                 rv = sscanf(buf, "%d", &modeint);
4399
4400         if (!rv)
4401                 return -1;
4402
4403         for (i = 0; tbl[i].modename; i++) {
4404                 if (modeint == tbl[i].mode)
4405                         return tbl[i].mode;
4406                 if (strcmp(modestr, tbl[i].modename) == 0)
4407                         return tbl[i].mode;
4408         }
4409
4410         return -1;
4411 }
4412
4413 static int bond_check_params(struct bond_params *params)
4414 {
4415         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4416
4417         /*
4418          * Convert string parameters.
4419          */
4420         if (mode) {
4421                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4422                 if (bond_mode == -1) {
4423                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4424                                mode == NULL ? "NULL" : mode);
4425                         return -EINVAL;
4426                 }
4427         }
4428
4429         if (xmit_hash_policy) {
4430                 if ((bond_mode != BOND_MODE_XOR) &&
4431                     (bond_mode != BOND_MODE_8023AD)) {
4432                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4433                                bond_mode_name(bond_mode));
4434                 } else {
4435                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4436                                                         xmit_hashtype_tbl);
4437                         if (xmit_hashtype == -1) {
4438                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4439                                        xmit_hash_policy == NULL ? "NULL" :
4440                                        xmit_hash_policy);
4441                                 return -EINVAL;
4442                         }
4443                 }
4444         }
4445
4446         if (lacp_rate) {
4447                 if (bond_mode != BOND_MODE_8023AD) {
4448                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4449                                 bond_mode_name(bond_mode));
4450                 } else {
4451                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4452                         if (lacp_fast == -1) {
4453                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4454                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4455                                 return -EINVAL;
4456                         }
4457                 }
4458         }
4459
4460         if (ad_select) {
4461                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4462                 if (params->ad_select == -1) {
4463                         pr_err("Error: Invalid ad_select \"%s\"\n",
4464                                ad_select == NULL ? "NULL" : ad_select);
4465                         return -EINVAL;
4466                 }
4467
4468                 if (bond_mode != BOND_MODE_8023AD) {
4469                         pr_warning("ad_select param only affects 802.3ad mode\n");
4470                 }
4471         } else {
4472                 params->ad_select = BOND_AD_STABLE;
4473         }
4474
4475         if (max_bonds < 0) {
4476                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4477                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4478                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4479         }
4480
4481         if (miimon < 0) {
4482                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4483                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4484                 miimon = BOND_LINK_MON_INTERV;
4485         }
4486
4487         if (updelay < 0) {
4488                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4489                            updelay, INT_MAX);
4490                 updelay = 0;
4491         }
4492
4493         if (downdelay < 0) {
4494                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4495                            downdelay, INT_MAX);
4496                 downdelay = 0;
4497         }
4498
4499         if ((use_carrier != 0) && (use_carrier != 1)) {
4500                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4501                            use_carrier);
4502                 use_carrier = 1;
4503         }
4504
4505         if (num_peer_notif < 0 || num_peer_notif > 255) {
4506                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4507                            num_peer_notif);
4508                 num_peer_notif = 1;
4509         }
4510
4511         /* reset values for 802.3ad */
4512         if (bond_mode == BOND_MODE_8023AD) {
4513                 if (!miimon) {
4514                         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");
4515                         pr_warning("Forcing miimon to 100msec\n");
4516                         miimon = 100;
4517                 }
4518         }
4519
4520         if (tx_queues < 1 || tx_queues > 255) {
4521                 pr_warning("Warning: tx_queues (%d) should be between "
4522                            "1 and 255, resetting to %d\n",
4523                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4524                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4525         }
4526
4527         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4528                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4529                            "not of valid value (0/1), so it was set to "
4530                            "0\n", all_slaves_active);
4531                 all_slaves_active = 0;
4532         }
4533
4534         if (resend_igmp < 0 || resend_igmp > 255) {
4535                 pr_warning("Warning: resend_igmp (%d) should be between "
4536                            "0 and 255, resetting to %d\n",
4537                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4538                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4539         }
4540
4541         /* reset values for TLB/ALB */
4542         if ((bond_mode == BOND_MODE_TLB) ||
4543             (bond_mode == BOND_MODE_ALB)) {
4544                 if (!miimon) {
4545                         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");
4546                         pr_warning("Forcing miimon to 100msec\n");
4547                         miimon = 100;
4548                 }
4549         }
4550
4551         if (bond_mode == BOND_MODE_ALB) {
4552                 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",
4553                           updelay);
4554         }
4555
4556         if (!miimon) {
4557                 if (updelay || downdelay) {
4558                         /* just warn the user the up/down delay will have
4559                          * no effect since miimon is zero...
4560                          */
4561                         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",
4562                                    updelay, downdelay);
4563                 }
4564         } else {
4565                 /* don't allow arp monitoring */
4566                 if (arp_interval) {
4567                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4568                                    miimon, arp_interval);
4569                         arp_interval = 0;
4570                 }
4571
4572                 if ((updelay % miimon) != 0) {
4573                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4574                                    updelay, miimon,
4575                                    (updelay / miimon) * miimon);
4576                 }
4577
4578                 updelay /= miimon;
4579
4580                 if ((downdelay % miimon) != 0) {
4581                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4582                                    downdelay, miimon,
4583                                    (downdelay / miimon) * miimon);
4584                 }
4585
4586                 downdelay /= miimon;
4587         }
4588
4589         if (arp_interval < 0) {
4590                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4591                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4592                 arp_interval = BOND_LINK_ARP_INTERV;
4593         }
4594
4595         for (arp_ip_count = 0;
4596              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4597              arp_ip_count++) {
4598                 /* not complete check, but should be good enough to
4599                    catch mistakes */
4600                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4601                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4602                                    arp_ip_target[arp_ip_count]);
4603                         arp_interval = 0;
4604                 } else {
4605                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4606                         arp_target[arp_ip_count] = ip;
4607                 }
4608         }
4609
4610         if (arp_interval && !arp_ip_count) {
4611                 /* don't allow arping if no arp_ip_target given... */
4612                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4613                            arp_interval);
4614                 arp_interval = 0;
4615         }
4616
4617         if (arp_validate) {
4618                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4619                         pr_err("arp_validate only supported in active-backup mode\n");
4620                         return -EINVAL;
4621                 }
4622                 if (!arp_interval) {
4623                         pr_err("arp_validate requires arp_interval\n");
4624                         return -EINVAL;
4625                 }
4626
4627                 arp_validate_value = bond_parse_parm(arp_validate,
4628                                                      arp_validate_tbl);
4629                 if (arp_validate_value == -1) {
4630                         pr_err("Error: invalid arp_validate \"%s\"\n",
4631                                arp_validate == NULL ? "NULL" : arp_validate);
4632                         return -EINVAL;
4633                 }
4634         } else
4635                 arp_validate_value = 0;
4636
4637         if (miimon) {
4638                 pr_info("MII link monitoring set to %d ms\n", miimon);
4639         } else if (arp_interval) {
4640                 int i;
4641
4642                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4643                         arp_interval,
4644                         arp_validate_tbl[arp_validate_value].modename,
4645                         arp_ip_count);
4646
4647                 for (i = 0; i < arp_ip_count; i++)
4648                         pr_info(" %s", arp_ip_target[i]);
4649
4650                 pr_info("\n");
4651
4652         } else if (max_bonds) {
4653                 /* miimon and arp_interval not set, we need one so things
4654                  * work as expected, see bonding.txt for details
4655                  */
4656                 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");
4657         }
4658
4659         if (primary && !USES_PRIMARY(bond_mode)) {
4660                 /* currently, using a primary only makes sense
4661                  * in active backup, TLB or ALB modes
4662                  */
4663                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4664                            primary, bond_mode_name(bond_mode));
4665                 primary = NULL;
4666         }
4667
4668         if (primary && primary_reselect) {
4669                 primary_reselect_value = bond_parse_parm(primary_reselect,
4670                                                          pri_reselect_tbl);
4671                 if (primary_reselect_value == -1) {
4672                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4673                                primary_reselect ==
4674                                         NULL ? "NULL" : primary_reselect);
4675                         return -EINVAL;
4676                 }
4677         } else {
4678                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4679         }
4680
4681         if (fail_over_mac) {
4682                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4683                                                       fail_over_mac_tbl);
4684                 if (fail_over_mac_value == -1) {
4685                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4686                                arp_validate == NULL ? "NULL" : arp_validate);
4687                         return -EINVAL;
4688                 }
4689
4690                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4691                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4692         } else {
4693                 fail_over_mac_value = BOND_FOM_NONE;
4694         }
4695
4696         /* fill params struct with the proper values */
4697         params->mode = bond_mode;
4698         params->xmit_policy = xmit_hashtype;
4699         params->miimon = miimon;
4700         params->num_peer_notif = num_peer_notif;
4701         params->arp_interval = arp_interval;
4702         params->arp_validate = arp_validate_value;
4703         params->updelay = updelay;
4704         params->downdelay = downdelay;
4705         params->use_carrier = use_carrier;
4706         params->lacp_fast = lacp_fast;
4707         params->primary[0] = 0;
4708         params->primary_reselect = primary_reselect_value;
4709         params->fail_over_mac = fail_over_mac_value;
4710         params->tx_queues = tx_queues;
4711         params->all_slaves_active = all_slaves_active;
4712         params->resend_igmp = resend_igmp;
4713         params->min_links = min_links;
4714
4715         if (primary) {
4716                 strncpy(params->primary, primary, IFNAMSIZ);
4717                 params->primary[IFNAMSIZ - 1] = 0;
4718         }
4719
4720         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4721
4722         return 0;
4723 }
4724
4725 static struct lock_class_key bonding_netdev_xmit_lock_key;
4726 static struct lock_class_key bonding_netdev_addr_lock_key;
4727
4728 static void bond_set_lockdep_class_one(struct net_device *dev,
4729                                        struct netdev_queue *txq,
4730                                        void *_unused)
4731 {
4732         lockdep_set_class(&txq->_xmit_lock,
4733                           &bonding_netdev_xmit_lock_key);
4734 }
4735
4736 static void bond_set_lockdep_class(struct net_device *dev)
4737 {
4738         lockdep_set_class(&dev->addr_list_lock,
4739                           &bonding_netdev_addr_lock_key);
4740         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4741 }
4742
4743 /*
4744  * Called from registration process
4745  */
4746 static int bond_init(struct net_device *bond_dev)
4747 {
4748         struct bonding *bond = netdev_priv(bond_dev);
4749         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4750         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4751
4752         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4753
4754         /*
4755          * Initialize locks that may be required during
4756          * en/deslave operations.  All of the bond_open work
4757          * (of which this is part) should really be moved to
4758          * a phase prior to dev_open
4759          */
4760         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4761         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4762
4763         bond->wq = create_singlethread_workqueue(bond_dev->name);
4764         if (!bond->wq)
4765                 return -ENOMEM;
4766
4767         bond_set_lockdep_class(bond_dev);
4768
4769         list_add_tail(&bond->bond_list, &bn->dev_list);
4770
4771         bond_prepare_sysfs_group(bond);
4772
4773         bond_debug_register(bond);
4774
4775         __hw_addr_init(&bond->mc_list);
4776         return 0;
4777 }
4778
4779 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4780 {
4781         if (tb[IFLA_ADDRESS]) {
4782                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4783                         return -EINVAL;
4784                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4785                         return -EADDRNOTAVAIL;
4786         }
4787         return 0;
4788 }
4789
4790 static int bond_get_tx_queues(struct net *net, struct nlattr *tb[],
4791                               unsigned int *num_queues,
4792                               unsigned int *real_num_queues)
4793 {
4794         *num_queues = tx_queues;
4795         return 0;
4796 }
4797
4798 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4799         .kind           = "bond",
4800         .priv_size      = sizeof(struct bonding),
4801         .setup          = bond_setup,
4802         .validate       = bond_validate,
4803         .get_tx_queues  = bond_get_tx_queues,
4804 };
4805
4806 /* Create a new bond based on the specified name and bonding parameters.
4807  * If name is NULL, obtain a suitable "bond%d" name for us.
4808  * Caller must NOT hold rtnl_lock; we need to release it here before we
4809  * set up our sysfs entries.
4810  */
4811 int bond_create(struct net *net, const char *name)
4812 {
4813         struct net_device *bond_dev;
4814         int res;
4815
4816         rtnl_lock();
4817
4818         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4819                                    name ? name : "bond%d",
4820                                    bond_setup, tx_queues);
4821         if (!bond_dev) {
4822                 pr_err("%s: eek! can't alloc netdev!\n", name);
4823                 rtnl_unlock();
4824                 return -ENOMEM;
4825         }
4826
4827         dev_net_set(bond_dev, net);
4828         bond_dev->rtnl_link_ops = &bond_link_ops;
4829
4830         res = register_netdevice(bond_dev);
4831
4832         netif_carrier_off(bond_dev);
4833
4834         rtnl_unlock();
4835         if (res < 0)
4836                 bond_destructor(bond_dev);
4837         return res;
4838 }
4839
4840 static int __net_init bond_net_init(struct net *net)
4841 {
4842         struct bond_net *bn = net_generic(net, bond_net_id);
4843
4844         bn->net = net;
4845         INIT_LIST_HEAD(&bn->dev_list);
4846
4847         bond_create_proc_dir(bn);
4848         bond_create_sysfs(bn);
4849
4850         return 0;
4851 }
4852
4853 static void __net_exit bond_net_exit(struct net *net)
4854 {
4855         struct bond_net *bn = net_generic(net, bond_net_id);
4856
4857         bond_destroy_sysfs(bn);
4858         bond_destroy_proc_dir(bn);
4859 }
4860
4861 static struct pernet_operations bond_net_ops = {
4862         .init = bond_net_init,
4863         .exit = bond_net_exit,
4864         .id   = &bond_net_id,
4865         .size = sizeof(struct bond_net),
4866 };
4867
4868 static int __init bonding_init(void)
4869 {
4870         int i;
4871         int res;
4872
4873         pr_info("%s", bond_version);
4874
4875         res = bond_check_params(&bonding_defaults);
4876         if (res)
4877                 goto out;
4878
4879         res = register_pernet_subsys(&bond_net_ops);
4880         if (res)
4881                 goto out;
4882
4883         res = rtnl_link_register(&bond_link_ops);
4884         if (res)
4885                 goto err_link;
4886
4887         bond_create_debugfs();
4888
4889         for (i = 0; i < max_bonds; i++) {
4890                 res = bond_create(&init_net, NULL);
4891                 if (res)
4892                         goto err;
4893         }
4894
4895         register_netdevice_notifier(&bond_netdev_notifier);
4896         register_inetaddr_notifier(&bond_inetaddr_notifier);
4897 out:
4898         return res;
4899 err:
4900         rtnl_link_unregister(&bond_link_ops);
4901 err_link:
4902         unregister_pernet_subsys(&bond_net_ops);
4903         goto out;
4904
4905 }
4906
4907 static void __exit bonding_exit(void)
4908 {
4909         unregister_netdevice_notifier(&bond_netdev_notifier);
4910         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4911
4912         bond_destroy_debugfs();
4913
4914         rtnl_link_unregister(&bond_link_ops);
4915         unregister_pernet_subsys(&bond_net_ops);
4916
4917 #ifdef CONFIG_NET_POLL_CONTROLLER
4918         /*
4919          * Make sure we don't have an imbalance on our netpoll blocking
4920          */
4921         WARN_ON(atomic_read(&netpoll_block_tx));
4922 #endif
4923 }
4924
4925 module_init(bonding_init);
4926 module_exit(bonding_exit);
4927 MODULE_LICENSE("GPL");
4928 MODULE_VERSION(DRV_VERSION);
4929 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4930 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4931 MODULE_ALIAS_RTNL_LINK("bond");