drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/ptrace.h>
  42 #include <linux/ioport.h>
  43 #include <linux/in.h>
  44 #include <net/ip.h>
  45 #include <linux/ip.h>
  46 #include <linux/tcp.h>
  47 #include <linux/udp.h>
  48 #include <linux/slab.h>
  49 #include <linux/string.h>
  50 #include <linux/init.h>
  51 #include <linux/timer.h>
  52 #include <linux/socket.h>
  53 #include <linux/ctype.h>
  54 #include <linux/inet.h>
  55 #include <linux/bitops.h>
  56 #include <linux/io.h>
  57 #include <asm/dma.h>
  58 #include <linux/uaccess.h>
  59 #include <linux/errno.h>
  60 #include <linux/netdevice.h>
  61 #include <linux/inetdevice.h>
  62 #include <linux/igmp.h>
  63 #include <linux/etherdevice.h>
  64 #include <linux/skbuff.h>
  65 #include <net/sock.h>
  66 #include <linux/rtnetlink.h>
  67 #include <linux/smp.h>
  68 #include <linux/if_ether.h>
  69 #include <net/arp.h>
  70 #include <linux/mii.h>
  71 #include <linux/ethtool.h>
  72 #include <linux/if_vlan.h>
  73 #include <linux/if_bonding.h>
  74 #include <linux/jiffies.h>
  75 #include <linux/preempt.h>
  76 #include <net/route.h>
  77 #include <net/net_namespace.h>
  78 #include <net/netns/generic.h>
  79 #include "bonding.h"
  80 #include "bond_3ad.h"
  81 #include "bond_alb.h"
  82
  83 /*---------------------------- Module parameters ----------------------------*/
  84
  85 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  86 #define BOND_LINK_MON_INTERV    0
  87 #define BOND_LINK_ARP_INTERV    0
  88
  89 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  90 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  91 static int num_peer_notif = 1;
  92 static int miimon       = BOND_LINK_MON_INTERV;
  93 static int updelay;
  94 static int downdelay;
  95 static int use_carrier  = 1;
  96 static char *mode;
  97 static char *primary;
  98 static char *primary_reselect;
  99 static char *lacp_rate;
 100 static int min_links;
 101 static char *ad_select;
 102 static char *xmit_hash_policy;
 103 static int arp_interval = BOND_LINK_ARP_INTERV;
 104 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 105 static char *arp_validate;
 106 static char *fail_over_mac;
 107 static int all_slaves_active = 0;
 108 static struct bond_params bonding_defaults;
 109 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 110
 111 module_param(max_bonds, int, 0);
 112 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 113 module_param(tx_queues, int, 0);
 114 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 115 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 116 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 117                                "failover event (alias of num_unsol_na)");
 118 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 119 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 120                                "failover event (alias of num_grat_arp)");
 121 module_param(miimon, int, 0);
 122 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 123 module_param(updelay, int, 0);
 124 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 125 module_param(downdelay, int, 0);
 126 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 127                             "in milliseconds");
 128 module_param(use_carrier, int, 0);
 129 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 130                               "0 for off, 1 for on (default)");
 131 module_param(mode, charp, 0);
 132 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 133                        "1 for active-backup, 2 for balance-xor, "
 134                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 135                        "6 for balance-alb");
 136 module_param(primary, charp, 0);
 137 MODULE_PARM_DESC(primary, "Primary network device to use");
 138 module_param(primary_reselect, charp, 0);
 139 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 140                                    "once it comes up; "
 141                                    "0 for always (default), "
 142                                    "1 for only if speed of primary is "
 143                                    "better, "
 144                                    "2 for only on active slave "
 145                                    "failure");
 146 module_param(lacp_rate, charp, 0);
 147 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 148                             "0 for slow, 1 for fast");
 149 module_param(ad_select, charp, 0);
 150 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 151                             "0 for stable (default), 1 for bandwidth, "
 152                             "2 for count");
 153 module_param(min_links, int, 0);
 154 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 155
 156 module_param(xmit_hash_policy, charp, 0);
 157 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 158                                    "0 for layer 2 (default), 1 for layer 3+4, "
 159                                    "2 for layer 2+3");
 160 module_param(arp_interval, int, 0);
 161 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 162 module_param_array(arp_ip_target, charp, NULL, 0);
 163 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 164 module_param(arp_validate, charp, 0);
 165 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 166                                "0 for none (default), 1 for active, "
 167                                "2 for backup, 3 for all");
 168 module_param(fail_over_mac, charp, 0);
 169 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 170                                 "the same MAC; 0 for none (default), "
 171                                 "1 for active, 2 for follow");
 172 module_param(all_slaves_active, int, 0);
 173 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 174                                      "by setting active flag for all slaves; "
 175                                      "0 for never (default), 1 for always.");
 176 module_param(resend_igmp, int, 0);
 177 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 178                               "link failure");
 179
 180 /*----------------------------- Global variables ----------------------------*/
 181
 182 #ifdef CONFIG_NET_POLL_CONTROLLER
 183 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 184 #endif
 185
 186 int bond_net_id __read_mostly;
 187
 188 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 189 static int arp_ip_count;
 190 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 191 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 192 static int lacp_fast;
 193
 194 const struct bond_parm_tbl bond_lacp_tbl[] = {
 195 {       "slow",         AD_LACP_SLOW},
 196 {       "fast",         AD_LACP_FAST},
 197 {       NULL,           -1},
 198 };
 199
 200 const struct bond_parm_tbl bond_mode_tbl[] = {
 201 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 202 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 203 {       "balance-xor",          BOND_MODE_XOR},
 204 {       "broadcast",            BOND_MODE_BROADCAST},
 205 {       "802.3ad",              BOND_MODE_8023AD},
 206 {       "balance-tlb",          BOND_MODE_TLB},
 207 {       "balance-alb",          BOND_MODE_ALB},
 208 {       NULL,                   -1},
 209 };
 210
 211 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 212 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 213 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 214 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 215 {       NULL,                   -1},
 216 };
 217
 218 const struct bond_parm_tbl arp_validate_tbl[] = {
 219 {       "none",                 BOND_ARP_VALIDATE_NONE},
 220 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 221 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 222 {       "all",                  BOND_ARP_VALIDATE_ALL},
 223 {       NULL,                   -1},
 224 };
 225
 226 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 227 {       "none",                 BOND_FOM_NONE},
 228 {       "active",               BOND_FOM_ACTIVE},
 229 {       "follow",               BOND_FOM_FOLLOW},
 230 {       NULL,                   -1},
 231 };
 232
 233 const struct bond_parm_tbl pri_reselect_tbl[] = {
 234 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 235 {       "better",               BOND_PRI_RESELECT_BETTER},
 236 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 237 {       NULL,                   -1},
 238 };
 239
 240 struct bond_parm_tbl ad_select_tbl[] = {
 241 {       "stable",       BOND_AD_STABLE},
 242 {       "bandwidth",    BOND_AD_BANDWIDTH},
 243 {       "count",        BOND_AD_COUNT},
 244 {       NULL,           -1},
 245 };
 246
 247 /*-------------------------- Forward declarations ---------------------------*/
 248
 249 static int bond_init(struct net_device *bond_dev);
 250 static void bond_uninit(struct net_device *bond_dev);
 251
 252 /*---------------------------- General routines -----------------------------*/
 253
 254 const char *bond_mode_name(int mode)
 255 {
 256         static const char *names[] = {
 257                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 258                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 259                 [BOND_MODE_XOR] = "load balancing (xor)",
 260                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 261                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 262                 [BOND_MODE_TLB] = "transmit load balancing",
 263                 [BOND_MODE_ALB] = "adaptive load balancing",
 264         };
 265
 266         if (mode < 0 || mode > BOND_MODE_ALB)
 267                 return "unknown";
 268
 269         return names[mode];
 270 }
 271
 272 /*---------------------------------- VLAN -----------------------------------*/
 273
 274 /**
 275  * bond_add_vlan - add a new vlan id on bond
 276  * @bond: bond that got the notification
 277  * @vlan_id: the vlan id to add
 278  *
 279  * Returns -ENOMEM if allocation failed.
 280  */
 281 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 282 {
 283         struct vlan_entry *vlan;
 284
 285         pr_debug("bond: %s, vlan id %d\n",
 286                  (bond ? bond->dev->name : "None"), vlan_id);
 287
 288         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 289         if (!vlan)
 290                 return -ENOMEM;
 291
 292         INIT_LIST_HEAD(&vlan->vlan_list);
 293         vlan->vlan_id = vlan_id;
 294
 295         write_lock_bh(&bond->lock);
 296
 297         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 298
 299         write_unlock_bh(&bond->lock);
 300
 301         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 302
 303         return 0;
 304 }
 305
 306 /**
 307  * bond_del_vlan - delete a vlan id from bond
 308  * @bond: bond that got the notification
 309  * @vlan_id: the vlan id to delete
 310  *
 311  * returns -ENODEV if @vlan_id was not found in @bond.
 312  */
 313 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 314 {
 315         struct vlan_entry *vlan;
 316         int res = -ENODEV;
 317
 318         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 319
 320         block_netpoll_tx();
 321         write_lock_bh(&bond->lock);
 322
 323         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 324                 if (vlan->vlan_id == vlan_id) {
 325                         list_del(&vlan->vlan_list);
 326
 327                         if (bond_is_lb(bond))
 328                                 bond_alb_clear_vlan(bond, vlan_id);
 329
 330                         pr_debug("removed VLAN ID %d from bond %s\n",
 331                                  vlan_id, bond->dev->name);
 332
 333                         kfree(vlan);
 334
 335                         res = 0;
 336                         goto out;
 337                 }
 338         }
 339
 340         pr_debug("couldn't find VLAN ID %d in bond %s\n",
 341                  vlan_id, bond->dev->name);
 342
 343 out:
 344         write_unlock_bh(&bond->lock);
 345         unblock_netpoll_tx();
 346         return res;
 347 }
 348
 349 /**
 350  * bond_next_vlan - safely skip to the next item in the vlans list.
 351  * @bond: the bond we're working on
 352  * @curr: item we're advancing from
 353  *
 354  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 355  * or @curr->next otherwise (even if it is @curr itself again).
 356  *
 357  * Caller must hold bond->lock
 358  */
 359 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 360 {
 361         struct vlan_entry *next, *last;
 362
 363         if (list_empty(&bond->vlan_list))
 364                 return NULL;
 365
 366         if (!curr) {
 367                 next = list_entry(bond->vlan_list.next,
 368                                   struct vlan_entry, vlan_list);
 369         } else {
 370                 last = list_entry(bond->vlan_list.prev,
 371                                   struct vlan_entry, vlan_list);
 372                 if (last == curr) {
 373                         next = list_entry(bond->vlan_list.next,
 374                                           struct vlan_entry, vlan_list);
 375                 } else {
 376                         next = list_entry(curr->vlan_list.next,
 377                                           struct vlan_entry, vlan_list);
 378                 }
 379         }
 380
 381         return next;
 382 }
 383
 384 #define bond_queue_mapping(skb) (*(u16 *)((skb)->cb))
 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         skb->queue_mapping = bond_queue_mapping(skb);
 399
 400         if (unlikely(netpoll_tx_running(slave_dev)))
 401                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 402         else
 403                 dev_queue_xmit(skb);
 404
 405         return 0;
 406 }
 407
 408 /*
 409  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 410  * We don't protect the slave list iteration with a lock because:
 411  * a. This operation is performed in IOCTL context,
 412  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 413  * c. Holding a lock with BH disabled while directly calling a base driver
 414  *    entry point is generally a BAD idea.
 415  *
 416  * The design of synchronization/protection for this operation in the 8021q
 417  * module is good for one or more VLAN devices over a single physical device
 418  * and cannot be extended for a teaming solution like bonding, so there is a
 419  * potential race condition here where a net device from the vlan group might
 420  * be referenced (either by a base driver or the 8021q code) while it is being
 421  * removed from the system. However, it turns out we're not making matters
 422  * worse, and if it works for regular VLAN usage it will work here too.
 423 */
 424
 425 /**
 426  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 427  * @bond_dev: bonding net device that got called
 428  * @vid: vlan id being added
 429  */
 430 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 431 {
 432         struct bonding *bond = netdev_priv(bond_dev);
 433         struct slave *slave, *stop_at;
 434         int i, res;
 435
 436         bond_for_each_slave(bond, slave, i) {
 437                 res = vlan_vid_add(slave->dev, vid);
 438                 if (res)
 439                         goto unwind;
 440         }
 441
 442         res = bond_add_vlan(bond, vid);
 443         if (res) {
 444                 pr_err("%s: Error: Failed to add vlan id %d\n",
 445                        bond_dev->name, vid);
 446                 return res;
 447         }
 448
 449         return 0;
 450
 451 unwind:
 452         /* unwind from head to the slave that failed */
 453         stop_at = slave;
 454         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at)
 455                 vlan_vid_del(slave->dev, vid);
 456
 457         return res;
 458 }
 459
 460 /**
 461  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 462  * @bond_dev: bonding net device that got called
 463  * @vid: vlan id being removed
 464  */
 465 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 466 {
 467         struct bonding *bond = netdev_priv(bond_dev);
 468         struct slave *slave;
 469         int i, res;
 470
 471         bond_for_each_slave(bond, slave, i)
 472                 vlan_vid_del(slave->dev, vid);
 473
 474         res = bond_del_vlan(bond, vid);
 475         if (res) {
 476                 pr_err("%s: Error: Failed to remove vlan id %d\n",
 477                        bond_dev->name, vid);
 478                 return res;
 479         }
 480
 481         return 0;
 482 }
 483
 484 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 485 {
 486         struct vlan_entry *vlan;
 487         int res;
 488
 489         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 490                 res = vlan_vid_add(slave_dev, vlan->vlan_id);
 491                 if (res)
 492                         pr_warning("%s: Failed to add vlan id %d to device %s\n",
 493                                    bond->dev->name, vlan->vlan_id,
 494                                    slave_dev->name);
 495         }
 496 }
 497
 498 static void bond_del_vlans_from_slave(struct bonding *bond,
 499                                       struct net_device *slave_dev)
 500 {
 501         struct vlan_entry *vlan;
 502
 503         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 504                 if (!vlan->vlan_id)
 505                         continue;
 506                 vlan_vid_del(slave_dev, vlan->vlan_id);
 507         }
 508 }
 509
 510 /*------------------------------- Link status -------------------------------*/
 511
 512 /*
 513  * Set the carrier state for the master according to the state of its
 514  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 515  * do special 802.3ad magic.
 516  *
 517  * Returns zero if carrier state does not change, nonzero if it does.
 518  */
 519 static int bond_set_carrier(struct bonding *bond)
 520 {
 521         struct slave *slave;
 522         int i;
 523
 524         if (bond->slave_cnt == 0)
 525                 goto down;
 526
 527         if (bond->params.mode == BOND_MODE_8023AD)
 528                 return bond_3ad_set_carrier(bond);
 529
 530         bond_for_each_slave(bond, slave, i) {
 531                 if (slave->link == BOND_LINK_UP) {
 532                         if (!netif_carrier_ok(bond->dev)) {
 533                                 netif_carrier_on(bond->dev);
 534                                 return 1;
 535                         }
 536                         return 0;
 537                 }
 538         }
 539
 540 down:
 541         if (netif_carrier_ok(bond->dev)) {
 542                 netif_carrier_off(bond->dev);
 543                 return 1;
 544         }
 545         return 0;
 546 }
 547
 548 /*
 549  * Get link speed and duplex from the slave's base driver
 550  * using ethtool. If for some reason the call fails or the
 551  * values are invalid, set speed and duplex to -1,
 552  * and return error.
 553  */
 554 static int bond_update_speed_duplex(struct slave *slave)
 555 {
 556         struct net_device *slave_dev = slave->dev;
 557         struct ethtool_cmd ecmd;
 558         u32 slave_speed;
 559         int res;
 560
 561         slave->speed = SPEED_UNKNOWN;
 562         slave->duplex = DUPLEX_UNKNOWN;
 563
 564         res = __ethtool_get_settings(slave_dev, &ecmd);
 565         if (res < 0)
 566                 return -1;
 567
 568         slave_speed = ethtool_cmd_speed(&ecmd);
 569         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 570                 return -1;
 571
 572         switch (ecmd.duplex) {
 573         case DUPLEX_FULL:
 574         case DUPLEX_HALF:
 575                 break;
 576         default:
 577                 return -1;
 578         }
 579
 580         slave->speed = slave_speed;
 581         slave->duplex = ecmd.duplex;
 582
 583         return 0;
 584 }
 585
 586 /*
 587  * if <dev> supports MII link status reporting, check its link status.
 588  *
 589  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 590  * depending upon the setting of the use_carrier parameter.
 591  *
 592  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 593  * can't tell and just pretend it is), or 0, meaning that the link is
 594  * down.
 595  *
 596  * If reporting is non-zero, instead of faking link up, return -1 if
 597  * both ETHTOOL and MII ioctls fail (meaning the device does not
 598  * support them).  If use_carrier is set, return whatever it says.
 599  * It'd be nice if there was a good way to tell if a driver supports
 600  * netif_carrier, but there really isn't.
 601  */
 602 static int bond_check_dev_link(struct bonding *bond,
 603                                struct net_device *slave_dev, int reporting)
 604 {
 605         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 606         int (*ioctl)(struct net_device *, struct ifreq *, int);
 607         struct ifreq ifr;
 608         struct mii_ioctl_data *mii;
 609
 610         if (!reporting && !netif_running(slave_dev))
 611                 return 0;
 612
 613         if (bond->params.use_carrier)
 614                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 615
 616         /* Try to get link status using Ethtool first. */
 617         if (slave_dev->ethtool_ops) {
 618                 if (slave_dev->ethtool_ops->get_link) {
 619                         u32 link;
 620
 621                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 622
 623                         return link ? BMSR_LSTATUS : 0;
 624                 }
 625         }
 626
 627         /* Ethtool can't be used, fallback to MII ioctls. */
 628         ioctl = slave_ops->ndo_do_ioctl;
 629         if (ioctl) {
 630                 /* TODO: set pointer to correct ioctl on a per team member */
 631                 /*       bases to make this more efficient. that is, once  */
 632                 /*       we determine the correct ioctl, we will always    */
 633                 /*       call it and not the others for that team          */
 634                 /*       member.                                           */
 635
 636                 /*
 637                  * We cannot assume that SIOCGMIIPHY will also read a
 638                  * register; not all network drivers (e.g., e100)
 639                  * support that.
 640                  */
 641
 642                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 643                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 644                 mii = if_mii(&ifr);
 645                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 646                         mii->reg_num = MII_BMSR;
 647                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 648                                 return mii->val_out & BMSR_LSTATUS;
 649                 }
 650         }
 651
 652         /*
 653          * If reporting, report that either there's no dev->do_ioctl,
 654          * or both SIOCGMIIREG and get_link failed (meaning that we
 655          * cannot report link status).  If not reporting, pretend
 656          * we're ok.
 657          */
 658         return reporting ? -1 : BMSR_LSTATUS;
 659 }
 660
 661 /*----------------------------- Multicast list ------------------------------*/
 662
 663 /*
 664  * Push the promiscuity flag down to appropriate slaves
 665  */
 666 static int bond_set_promiscuity(struct bonding *bond, int inc)
 667 {
 668         int err = 0;
 669         if (USES_PRIMARY(bond->params.mode)) {
 670                 /* write lock already acquired */
 671                 if (bond->curr_active_slave) {
 672                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 673                                                   inc);
 674                 }
 675         } else {
 676                 struct slave *slave;
 677                 int i;
 678                 bond_for_each_slave(bond, slave, i) {
 679                         err = dev_set_promiscuity(slave->dev, inc);
 680                         if (err)
 681                                 return err;
 682                 }
 683         }
 684         return err;
 685 }
 686
 687 /*
 688  * Push the allmulti flag down to all slaves
 689  */
 690 static int bond_set_allmulti(struct bonding *bond, int inc)
 691 {
 692         int err = 0;
 693         if (USES_PRIMARY(bond->params.mode)) {
 694                 /* write lock already acquired */
 695                 if (bond->curr_active_slave) {
 696                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 697                                                inc);
 698                 }
 699         } else {
 700                 struct slave *slave;
 701                 int i;
 702                 bond_for_each_slave(bond, slave, i) {
 703                         err = dev_set_allmulti(slave->dev, inc);
 704                         if (err)
 705                                 return err;
 706                 }
 707         }
 708         return err;
 709 }
 710
 711 /*
 712  * Add a Multicast address to slaves
 713  * according to mode
 714  */
 715 static void bond_mc_add(struct bonding *bond, void *addr)
 716 {
 717         if (USES_PRIMARY(bond->params.mode)) {
 718                 /* write lock already acquired */
 719                 if (bond->curr_active_slave)
 720                         dev_mc_add(bond->curr_active_slave->dev, addr);
 721         } else {
 722                 struct slave *slave;
 723                 int i;
 724
 725                 bond_for_each_slave(bond, slave, i)
 726                         dev_mc_add(slave->dev, addr);
 727         }
 728 }
 729
 730 /*
 731  * Remove a multicast address from slave
 732  * according to mode
 733  */
 734 static void bond_mc_del(struct bonding *bond, void *addr)
 735 {
 736         if (USES_PRIMARY(bond->params.mode)) {
 737                 /* write lock already acquired */
 738                 if (bond->curr_active_slave)
 739                         dev_mc_del(bond->curr_active_slave->dev, addr);
 740         } else {
 741                 struct slave *slave;
 742                 int i;
 743                 bond_for_each_slave(bond, slave, i) {
 744                         dev_mc_del(slave->dev, addr);
 745                 }
 746         }
 747 }
 748
 749
 750 static void __bond_resend_igmp_join_requests(struct net_device *dev)
 751 {
 752         struct in_device *in_dev;
 753
 754         rcu_read_lock();
 755         in_dev = __in_dev_get_rcu(dev);
 756         if (in_dev)
 757                 ip_mc_rejoin_groups(in_dev);
 758         rcu_read_unlock();
 759 }
 760
 761 /*
 762  * Retrieve the list of registered multicast addresses for the bonding
 763  * device and retransmit an IGMP JOIN request to the current active
 764  * slave.
 765  */
 766 static void bond_resend_igmp_join_requests(struct bonding *bond)
 767 {
 768         struct net_device *bond_dev, *vlan_dev, *master_dev;
 769         struct vlan_entry *vlan;
 770
 771         read_lock(&bond->lock);
 772
 773         bond_dev = bond->dev;
 774
 775         /* rejoin all groups on bond device */
 776         __bond_resend_igmp_join_requests(bond_dev);
 777
 778         /*
 779          * if bond is enslaved to a bridge,
 780          * then rejoin all groups on its master
 781          */
 782         master_dev = bond_dev->master;
 783         if (master_dev)
 784                 if ((master_dev->priv_flags & IFF_EBRIDGE)
 785                         && (bond_dev->priv_flags & IFF_BRIDGE_PORT))
 786                         __bond_resend_igmp_join_requests(master_dev);
 787
 788         /* rejoin all groups on vlan devices */
 789         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 790                 rcu_read_lock();
 791                 vlan_dev = __vlan_find_dev_deep(bond_dev,
 792                                                 vlan->vlan_id);
 793                 rcu_read_unlock();
 794                 if (vlan_dev)
 795                         __bond_resend_igmp_join_requests(vlan_dev);
 796         }
 797
 798         if (--bond->igmp_retrans > 0)
 799                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 800
 801         read_unlock(&bond->lock);
 802 }
 803
 804 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 805 {
 806         struct bonding *bond = container_of(work, struct bonding,
 807                                             mcast_work.work);
 808         bond_resend_igmp_join_requests(bond);
 809 }
 810
 811 /*
 812  * flush all members of flush->mc_list from device dev->mc_list
 813  */
 814 static void bond_mc_list_flush(struct net_device *bond_dev,
 815                                struct net_device *slave_dev)
 816 {
 817         struct bonding *bond = netdev_priv(bond_dev);
 818         struct netdev_hw_addr *ha;
 819
 820         netdev_for_each_mc_addr(ha, bond_dev)
 821                 dev_mc_del(slave_dev, ha->addr);
 822
 823         if (bond->params.mode == BOND_MODE_8023AD) {
 824                 /* del lacpdu mc addr from mc list */
 825                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 826
 827                 dev_mc_del(slave_dev, lacpdu_multicast);
 828         }
 829 }
 830
 831 /*--------------------------- Active slave change ---------------------------*/
 832
 833 /*
 834  * Update the mc list and multicast-related flags for the new and
 835  * old active slaves (if any) according to the multicast mode, and
 836  * promiscuous flags unconditionally.
 837  */
 838 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
 839                          struct slave *old_active)
 840 {
 841         struct netdev_hw_addr *ha;
 842
 843         if (!USES_PRIMARY(bond->params.mode))
 844                 /* nothing to do -  mc list is already up-to-date on
 845                  * all slaves
 846                  */
 847                 return;
 848
 849         if (old_active) {
 850                 if (bond->dev->flags & IFF_PROMISC)
 851                         dev_set_promiscuity(old_active->dev, -1);
 852
 853                 if (bond->dev->flags & IFF_ALLMULTI)
 854                         dev_set_allmulti(old_active->dev, -1);
 855
 856                 netdev_for_each_mc_addr(ha, bond->dev)
 857                         dev_mc_del(old_active->dev, ha->addr);
 858         }
 859
 860         if (new_active) {
 861                 /* FIXME: Signal errors upstream. */
 862                 if (bond->dev->flags & IFF_PROMISC)
 863                         dev_set_promiscuity(new_active->dev, 1);
 864
 865                 if (bond->dev->flags & IFF_ALLMULTI)
 866                         dev_set_allmulti(new_active->dev, 1);
 867
 868                 netdev_for_each_mc_addr(ha, bond->dev)
 869                         dev_mc_add(new_active->dev, ha->addr);
 870         }
 871 }
 872
 873 /*
 874  * bond_do_fail_over_mac
 875  *
 876  * Perform special MAC address swapping for fail_over_mac settings
 877  *
 878  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 879  */
 880 static void bond_do_fail_over_mac(struct bonding *bond,
 881                                   struct slave *new_active,
 882                                   struct slave *old_active)
 883         __releases(&bond->curr_slave_lock)
 884         __releases(&bond->lock)
 885         __acquires(&bond->lock)
 886         __acquires(&bond->curr_slave_lock)
 887 {
 888         u8 tmp_mac[ETH_ALEN];
 889         struct sockaddr saddr;
 890         int rv;
 891
 892         switch (bond->params.fail_over_mac) {
 893         case BOND_FOM_ACTIVE:
 894                 if (new_active) {
 895                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
 896                                new_active->dev->addr_len);
 897                         write_unlock_bh(&bond->curr_slave_lock);
 898                         read_unlock(&bond->lock);
 899                         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
 900                         read_lock(&bond->lock);
 901                         write_lock_bh(&bond->curr_slave_lock);
 902                 }
 903                 break;
 904         case BOND_FOM_FOLLOW:
 905                 /*
 906                  * if new_active && old_active, swap them
 907                  * if just old_active, do nothing (going to no active slave)
 908                  * if just new_active, set new_active to bond's MAC
 909                  */
 910                 if (!new_active)
 911                         return;
 912
 913                 write_unlock_bh(&bond->curr_slave_lock);
 914                 read_unlock(&bond->lock);
 915
 916                 if (old_active) {
 917                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 918                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 919                                ETH_ALEN);
 920                         saddr.sa_family = new_active->dev->type;
 921                 } else {
 922                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 923                         saddr.sa_family = bond->dev->type;
 924                 }
 925
 926                 rv = dev_set_mac_address(new_active->dev, &saddr);
 927                 if (rv) {
 928                         pr_err("%s: Error %d setting MAC of slave %s\n",
 929                                bond->dev->name, -rv, new_active->dev->name);
 930                         goto out;
 931                 }
 932
 933                 if (!old_active)
 934                         goto out;
 935
 936                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
 937                 saddr.sa_family = old_active->dev->type;
 938
 939                 rv = dev_set_mac_address(old_active->dev, &saddr);
 940                 if (rv)
 941                         pr_err("%s: Error %d setting MAC of slave %s\n",
 942                                bond->dev->name, -rv, new_active->dev->name);
 943 out:
 944                 read_lock(&bond->lock);
 945                 write_lock_bh(&bond->curr_slave_lock);
 946                 break;
 947         default:
 948                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
 949                        bond->dev->name, bond->params.fail_over_mac);
 950                 break;
 951         }
 952
 953 }
 954
 955 static bool bond_should_change_active(struct bonding *bond)
 956 {
 957         struct slave *prim = bond->primary_slave;
 958         struct slave *curr = bond->curr_active_slave;
 959
 960         if (!prim || !curr || curr->link != BOND_LINK_UP)
 961                 return true;
 962         if (bond->force_primary) {
 963                 bond->force_primary = false;
 964                 return true;
 965         }
 966         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 967             (prim->speed < curr->speed ||
 968              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 969                 return false;
 970         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 971                 return false;
 972         return true;
 973 }
 974
 975 /**
 976  * find_best_interface - select the best available slave to be the active one
 977  * @bond: our bonding struct
 978  *
 979  * Warning: Caller must hold curr_slave_lock for writing.
 980  */
 981 static struct slave *bond_find_best_slave(struct bonding *bond)
 982 {
 983         struct slave *new_active, *old_active;
 984         struct slave *bestslave = NULL;
 985         int mintime = bond->params.updelay;
 986         int i;
 987
 988         new_active = bond->curr_active_slave;
 989
 990         if (!new_active) { /* there were no active slaves left */
 991                 if (bond->slave_cnt > 0)   /* found one slave */
 992                         new_active = bond->first_slave;
 993                 else
 994                         return NULL; /* still no slave, return NULL */
 995         }
 996
 997         if ((bond->primary_slave) &&
 998             bond->primary_slave->link == BOND_LINK_UP &&
 999             bond_should_change_active(bond)) {
1000                 new_active = bond->primary_slave;
1001         }
1002
1003         /* remember where to stop iterating over the slaves */
1004         old_active = new_active;
1005
1006         bond_for_each_slave_from(bond, new_active, i, old_active) {
1007                 if (new_active->link == BOND_LINK_UP) {
1008                         return new_active;
1009                 } else if (new_active->link == BOND_LINK_BACK &&
1010                            IS_UP(new_active->dev)) {
1011                         /* link up, but waiting for stabilization */
1012                         if (new_active->delay < mintime) {
1013                                 mintime = new_active->delay;
1014                                 bestslave = new_active;
1015                         }
1016                 }
1017         }
1018
1019         return bestslave;
1020 }
1021
1022 static bool bond_should_notify_peers(struct bonding *bond)
1023 {
1024         struct slave *slave = bond->curr_active_slave;
1025
1026         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1027                  bond->dev->name, slave ? slave->dev->name : "NULL");
1028
1029         if (!slave || !bond->send_peer_notif ||
1030             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1031                 return false;
1032
1033         bond->send_peer_notif--;
1034         return true;
1035 }
1036
1037 /**
1038  * change_active_interface - change the active slave into the specified one
1039  * @bond: our bonding struct
1040  * @new: the new slave to make the active one
1041  *
1042  * Set the new slave to the bond's settings and unset them on the old
1043  * curr_active_slave.
1044  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1045  *
1046  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1047  * because it is apparently the best available slave we have, even though its
1048  * updelay hasn't timed out yet.
1049  *
1050  * If new_active is not NULL, caller must hold bond->lock for read and
1051  * curr_slave_lock for write_bh.
1052  */
1053 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1054 {
1055         struct slave *old_active = bond->curr_active_slave;
1056
1057         if (old_active == new_active)
1058                 return;
1059
1060         if (new_active) {
1061                 new_active->jiffies = jiffies;
1062
1063                 if (new_active->link == BOND_LINK_BACK) {
1064                         if (USES_PRIMARY(bond->params.mode)) {
1065                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1066                                         bond->dev->name, new_active->dev->name,
1067                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1068                         }
1069
1070                         new_active->delay = 0;
1071                         new_active->link = BOND_LINK_UP;
1072
1073                         if (bond->params.mode == BOND_MODE_8023AD)
1074                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1075
1076                         if (bond_is_lb(bond))
1077                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1078                 } else {
1079                         if (USES_PRIMARY(bond->params.mode)) {
1080                                 pr_info("%s: making interface %s the new active one.\n",
1081                                         bond->dev->name, new_active->dev->name);
1082                         }
1083                 }
1084         }
1085
1086         if (USES_PRIMARY(bond->params.mode))
1087                 bond_mc_swap(bond, new_active, old_active);
1088
1089         if (bond_is_lb(bond)) {
1090                 bond_alb_handle_active_change(bond, new_active);
1091                 if (old_active)
1092                         bond_set_slave_inactive_flags(old_active);
1093                 if (new_active)
1094                         bond_set_slave_active_flags(new_active);
1095         } else {
1096                 bond->curr_active_slave = new_active;
1097         }
1098
1099         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1100                 if (old_active)
1101                         bond_set_slave_inactive_flags(old_active);
1102
1103                 if (new_active) {
1104                         bool should_notify_peers = false;
1105
1106                         bond_set_slave_active_flags(new_active);
1107
1108                         if (bond->params.fail_over_mac)
1109                                 bond_do_fail_over_mac(bond, new_active,
1110                                                       old_active);
1111
1112                         if (netif_running(bond->dev)) {
1113                                 bond->send_peer_notif =
1114                                         bond->params.num_peer_notif;
1115                                 should_notify_peers =
1116                                         bond_should_notify_peers(bond);
1117                         }
1118
1119                         write_unlock_bh(&bond->curr_slave_lock);
1120                         read_unlock(&bond->lock);
1121
1122                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1123                         if (should_notify_peers)
1124                                 netdev_bonding_change(bond->dev,
1125                                                       NETDEV_NOTIFY_PEERS);
1126
1127                         read_lock(&bond->lock);
1128                         write_lock_bh(&bond->curr_slave_lock);
1129                 }
1130         }
1131
1132         /* resend IGMP joins since active slave has changed or
1133          * all were sent on curr_active_slave.
1134          * resend only if bond is brought up with the affected
1135          * bonding modes and the retransmission is enabled */
1136         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1137             ((USES_PRIMARY(bond->params.mode) && new_active) ||
1138              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1139                 bond->igmp_retrans = bond->params.resend_igmp;
1140                 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1141         }
1142 }
1143
1144 /**
1145  * bond_select_active_slave - select a new active slave, if needed
1146  * @bond: our bonding struct
1147  *
1148  * This functions should be called when one of the following occurs:
1149  * - The old curr_active_slave has been released or lost its link.
1150  * - The primary_slave has got its link back.
1151  * - A slave has got its link back and there's no old curr_active_slave.
1152  *
1153  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1154  */
1155 void bond_select_active_slave(struct bonding *bond)
1156 {
1157         struct slave *best_slave;
1158         int rv;
1159
1160         best_slave = bond_find_best_slave(bond);
1161         if (best_slave != bond->curr_active_slave) {
1162                 bond_change_active_slave(bond, best_slave);
1163                 rv = bond_set_carrier(bond);
1164                 if (!rv)
1165                         return;
1166
1167                 if (netif_carrier_ok(bond->dev)) {
1168                         pr_info("%s: first active interface up!\n",
1169                                 bond->dev->name);
1170                 } else {
1171                         pr_info("%s: now running without any active interface !\n",
1172                                 bond->dev->name);
1173                 }
1174         }
1175 }
1176
1177 /*--------------------------- slave list handling ---------------------------*/
1178
1179 /*
1180  * This function attaches the slave to the end of list.
1181  *
1182  * bond->lock held for writing by caller.
1183  */
1184 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1185 {
1186         if (bond->first_slave == NULL) { /* attaching the first slave */
1187                 new_slave->next = new_slave;
1188                 new_slave->prev = new_slave;
1189                 bond->first_slave = new_slave;
1190         } else {
1191                 new_slave->next = bond->first_slave;
1192                 new_slave->prev = bond->first_slave->prev;
1193                 new_slave->next->prev = new_slave;
1194                 new_slave->prev->next = new_slave;
1195         }
1196
1197         bond->slave_cnt++;
1198 }
1199
1200 /*
1201  * This function detaches the slave from the list.
1202  * WARNING: no check is made to verify if the slave effectively
1203  * belongs to <bond>.
1204  * Nothing is freed on return, structures are just unchained.
1205  * If any slave pointer in bond was pointing to <slave>,
1206  * it should be changed by the calling function.
1207  *
1208  * bond->lock held for writing by caller.
1209  */
1210 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1211 {
1212         if (slave->next)
1213                 slave->next->prev = slave->prev;
1214
1215         if (slave->prev)
1216                 slave->prev->next = slave->next;
1217
1218         if (bond->first_slave == slave) { /* slave is the first slave */
1219                 if (bond->slave_cnt > 1) { /* there are more slave */
1220                         bond->first_slave = slave->next;
1221                 } else {
1222                         bond->first_slave = NULL; /* slave was the last one */
1223                 }
1224         }
1225
1226         slave->next = NULL;
1227         slave->prev = NULL;
1228         bond->slave_cnt--;
1229 }
1230
1231 #ifdef CONFIG_NET_POLL_CONTROLLER
1232 static inline int slave_enable_netpoll(struct slave *slave)
1233 {
1234         struct netpoll *np;
1235         int err = 0;
1236
1237         np = kzalloc(sizeof(*np), GFP_KERNEL);
1238         err = -ENOMEM;
1239         if (!np)
1240                 goto out;
1241
1242         np->dev = slave->dev;
1243         strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ);
1244         err = __netpoll_setup(np);
1245         if (err) {
1246                 kfree(np);
1247                 goto out;
1248         }
1249         slave->np = np;
1250 out:
1251         return err;
1252 }
1253 static inline void slave_disable_netpoll(struct slave *slave)
1254 {
1255         struct netpoll *np = slave->np;
1256
1257         if (!np)
1258                 return;
1259
1260         slave->np = NULL;
1261         synchronize_rcu_bh();
1262         __netpoll_cleanup(np);
1263         kfree(np);
1264 }
1265 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1266 {
1267         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1268                 return false;
1269         if (!slave_dev->netdev_ops->ndo_poll_controller)
1270                 return false;
1271         return true;
1272 }
1273
1274 static void bond_poll_controller(struct net_device *bond_dev)
1275 {
1276 }
1277
1278 static void __bond_netpoll_cleanup(struct bonding *bond)
1279 {
1280         struct slave *slave;
1281         int i;
1282
1283         bond_for_each_slave(bond, slave, i)
1284                 if (IS_UP(slave->dev))
1285                         slave_disable_netpoll(slave);
1286 }
1287 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1288 {
1289         struct bonding *bond = netdev_priv(bond_dev);
1290
1291         read_lock(&bond->lock);
1292         __bond_netpoll_cleanup(bond);
1293         read_unlock(&bond->lock);
1294 }
1295
1296 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1297 {
1298         struct bonding *bond = netdev_priv(dev);
1299         struct slave *slave;
1300         int i, err = 0;
1301
1302         read_lock(&bond->lock);
1303         bond_for_each_slave(bond, slave, i) {
1304                 err = slave_enable_netpoll(slave);
1305                 if (err) {
1306                         __bond_netpoll_cleanup(bond);
1307                         break;
1308                 }
1309         }
1310         read_unlock(&bond->lock);
1311         return err;
1312 }
1313
1314 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1315 {
1316         return bond->dev->npinfo;
1317 }
1318
1319 #else
1320 static inline int slave_enable_netpoll(struct slave *slave)
1321 {
1322         return 0;
1323 }
1324 static inline void slave_disable_netpoll(struct slave *slave)
1325 {
1326 }
1327 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1328 {
1329 }
1330 #endif
1331
1332 /*---------------------------------- IOCTL ----------------------------------*/
1333
1334 static int bond_sethwaddr(struct net_device *bond_dev,
1335                           struct net_device *slave_dev)
1336 {
1337         pr_debug("bond_dev=%p\n", bond_dev);
1338         pr_debug("slave_dev=%p\n", slave_dev);
1339         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1340         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1341         return 0;
1342 }
1343
1344 static netdev_features_t bond_fix_features(struct net_device *dev,
1345         netdev_features_t features)
1346 {
1347         struct slave *slave;
1348         struct bonding *bond = netdev_priv(dev);
1349         netdev_features_t mask;
1350         int i;
1351
1352         read_lock(&bond->lock);
1353
1354         if (!bond->first_slave) {
1355                 /* Disable adding VLANs to empty bond. But why? --mq */
1356                 features |= NETIF_F_VLAN_CHALLENGED;
1357                 goto out;
1358         }
1359
1360         mask = features;
1361         features &= ~NETIF_F_ONE_FOR_ALL;
1362         features |= NETIF_F_ALL_FOR_ALL;
1363
1364         bond_for_each_slave(bond, slave, i) {
1365                 features = netdev_increment_features(features,
1366                                                      slave->dev->features,
1367                                                      mask);
1368         }
1369
1370 out:
1371         read_unlock(&bond->lock);
1372         return features;
1373 }
1374
1375 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1376                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1377                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1378
1379 static void bond_compute_features(struct bonding *bond)
1380 {
1381         struct slave *slave;
1382         struct net_device *bond_dev = bond->dev;
1383         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1384         unsigned short max_hard_header_len = ETH_HLEN;
1385         int i;
1386
1387         read_lock(&bond->lock);
1388
1389         if (!bond->first_slave)
1390                 goto done;
1391
1392         bond_for_each_slave(bond, slave, i) {
1393                 vlan_features = netdev_increment_features(vlan_features,
1394                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1395
1396                 if (slave->dev->hard_header_len > max_hard_header_len)
1397                         max_hard_header_len = slave->dev->hard_header_len;
1398         }
1399
1400 done:
1401         bond_dev->vlan_features = vlan_features;
1402         bond_dev->hard_header_len = max_hard_header_len;
1403
1404         read_unlock(&bond->lock);
1405
1406         netdev_change_features(bond_dev);
1407 }
1408
1409 static void bond_setup_by_slave(struct net_device *bond_dev,
1410                                 struct net_device *slave_dev)
1411 {
1412         struct bonding *bond = netdev_priv(bond_dev);
1413
1414         bond_dev->header_ops        = slave_dev->header_ops;
1415
1416         bond_dev->type              = slave_dev->type;
1417         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1418         bond_dev->addr_len          = slave_dev->addr_len;
1419
1420         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1421                 slave_dev->addr_len);
1422         bond->setup_by_slave = 1;
1423 }
1424
1425 /* On bonding slaves other than the currently active slave, suppress
1426  * duplicates except for alb non-mcast/bcast.
1427  */
1428 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1429                                             struct slave *slave,
1430                                             struct bonding *bond)
1431 {
1432         if (bond_is_slave_inactive(slave)) {
1433                 if (bond->params.mode == BOND_MODE_ALB &&
1434                     skb->pkt_type != PACKET_BROADCAST &&
1435                     skb->pkt_type != PACKET_MULTICAST)
1436                         return false;
1437                 return true;
1438         }
1439         return false;
1440 }
1441
1442 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1443 {
1444         struct sk_buff *skb = *pskb;
1445         struct slave *slave;
1446         struct bonding *bond;
1447         void (*recv_probe)(struct sk_buff *, struct bonding *,
1448                                 struct slave *);
1449
1450         skb = skb_share_check(skb, GFP_ATOMIC);
1451         if (unlikely(!skb))
1452                 return RX_HANDLER_CONSUMED;
1453
1454         *pskb = skb;
1455
1456         slave = bond_slave_get_rcu(skb->dev);
1457         bond = slave->bond;
1458
1459         if (bond->params.arp_interval)
1460                 slave->dev->last_rx = jiffies;
1461
1462         recv_probe = ACCESS_ONCE(bond->recv_probe);
1463         if (recv_probe) {
1464                 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1465
1466                 if (likely(nskb)) {
1467                         recv_probe(nskb, bond, slave);
1468                         dev_kfree_skb(nskb);
1469                 }
1470         }
1471
1472         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1473                 return RX_HANDLER_EXACT;
1474         }
1475
1476         skb->dev = bond->dev;
1477
1478         if (bond->params.mode == BOND_MODE_ALB &&
1479             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1480             skb->pkt_type == PACKET_HOST) {
1481
1482                 if (unlikely(skb_cow_head(skb,
1483                                           skb->data - skb_mac_header(skb)))) {
1484                         kfree_skb(skb);
1485                         return RX_HANDLER_CONSUMED;
1486                 }
1487                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1488         }
1489
1490         return RX_HANDLER_ANOTHER;
1491 }
1492
1493 /* enslave device <slave> to bond device <master> */
1494 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1495 {
1496         struct bonding *bond = netdev_priv(bond_dev);
1497         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1498         struct slave *new_slave = NULL;
1499         struct netdev_hw_addr *ha;
1500         struct sockaddr addr;
1501         int link_reporting;
1502         int res = 0;
1503
1504         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1505                 slave_ops->ndo_do_ioctl == NULL) {
1506                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1507                            bond_dev->name, slave_dev->name);
1508         }
1509
1510         /* already enslaved */
1511         if (slave_dev->flags & IFF_SLAVE) {
1512                 pr_debug("Error, Device was already enslaved\n");
1513                 return -EBUSY;
1514         }
1515
1516         /* vlan challenged mutual exclusion */
1517         /* no need to lock since we're protected by rtnl_lock */
1518         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1519                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1520                 if (bond_vlan_used(bond)) {
1521                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1522                                bond_dev->name, slave_dev->name, bond_dev->name);
1523                         return -EPERM;
1524                 } else {
1525                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1526                                    bond_dev->name, slave_dev->name,
1527                                    slave_dev->name, bond_dev->name);
1528                 }
1529         } else {
1530                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1531         }
1532
1533         /*
1534          * Old ifenslave binaries are no longer supported.  These can
1535          * be identified with moderate accuracy by the state of the slave:
1536          * the current ifenslave will set the interface down prior to
1537          * enslaving it; the old ifenslave will not.
1538          */
1539         if ((slave_dev->flags & IFF_UP)) {
1540                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1541                        slave_dev->name);
1542                 res = -EPERM;
1543                 goto err_undo_flags;
1544         }
1545
1546         /* set bonding device ether type by slave - bonding netdevices are
1547          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1548          * there is a need to override some of the type dependent attribs/funcs.
1549          *
1550          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1551          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1552          */
1553         if (bond->slave_cnt == 0) {
1554                 if (bond_dev->type != slave_dev->type) {
1555                         pr_debug("%s: change device type from %d to %d\n",
1556                                  bond_dev->name,
1557                                  bond_dev->type, slave_dev->type);
1558
1559                         res = netdev_bonding_change(bond_dev,
1560                                                     NETDEV_PRE_TYPE_CHANGE);
1561                         res = notifier_to_errno(res);
1562                         if (res) {
1563                                 pr_err("%s: refused to change device type\n",
1564                                        bond_dev->name);
1565                                 res = -EBUSY;
1566                                 goto err_undo_flags;
1567                         }
1568
1569                         /* Flush unicast and multicast addresses */
1570                         dev_uc_flush(bond_dev);
1571                         dev_mc_flush(bond_dev);
1572
1573                         if (slave_dev->type != ARPHRD_ETHER)
1574                                 bond_setup_by_slave(bond_dev, slave_dev);
1575                         else {
1576                                 ether_setup(bond_dev);
1577                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1578                         }
1579
1580                         netdev_bonding_change(bond_dev,
1581                                               NETDEV_POST_TYPE_CHANGE);
1582                 }
1583         } else if (bond_dev->type != slave_dev->type) {
1584                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1585                        slave_dev->name,
1586                        slave_dev->type, bond_dev->type);
1587                 res = -EINVAL;
1588                 goto err_undo_flags;
1589         }
1590
1591         if (slave_ops->ndo_set_mac_address == NULL) {
1592                 if (bond->slave_cnt == 0) {
1593                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1594                                    bond_dev->name);
1595                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1596                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1597                         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",
1598                                bond_dev->name);
1599                         res = -EOPNOTSUPP;
1600                         goto err_undo_flags;
1601                 }
1602         }
1603
1604         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1605
1606         /* If this is the first slave, then we need to set the master's hardware
1607          * address to be the same as the slave's. */
1608         if (is_zero_ether_addr(bond->dev->dev_addr))
1609                 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1610                        slave_dev->addr_len);
1611
1612
1613         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1614         if (!new_slave) {
1615                 res = -ENOMEM;
1616                 goto err_undo_flags;
1617         }
1618
1619         /*
1620          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1621          * is set via sysfs or module option if desired.
1622          */
1623         new_slave->queue_id = 0;
1624
1625         /* Save slave's original mtu and then set it to match the bond */
1626         new_slave->original_mtu = slave_dev->mtu;
1627         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1628         if (res) {
1629                 pr_debug("Error %d calling dev_set_mtu\n", res);
1630                 goto err_free;
1631         }
1632
1633         /*
1634          * Save slave's original ("permanent") mac address for modes
1635          * that need it, and for restoring it upon release, and then
1636          * set it to the master's address
1637          */
1638         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1639
1640         if (!bond->params.fail_over_mac) {
1641                 /*
1642                  * Set slave to master's mac address.  The application already
1643                  * set the master's mac address to that of the first slave
1644                  */
1645                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1646                 addr.sa_family = slave_dev->type;
1647                 res = dev_set_mac_address(slave_dev, &addr);
1648                 if (res) {
1649                         pr_debug("Error %d calling set_mac_address\n", res);
1650                         goto err_restore_mtu;
1651                 }
1652         }
1653
1654         res = netdev_set_bond_master(slave_dev, bond_dev);
1655         if (res) {
1656                 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1657                 goto err_restore_mac;
1658         }
1659
1660         /* open the slave since the application closed it */
1661         res = dev_open(slave_dev);
1662         if (res) {
1663                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1664                 goto err_unset_master;
1665         }
1666
1667         new_slave->bond = bond;
1668         new_slave->dev = slave_dev;
1669         slave_dev->priv_flags |= IFF_BONDING;
1670
1671         if (bond_is_lb(bond)) {
1672                 /* bond_alb_init_slave() must be called before all other stages since
1673                  * it might fail and we do not want to have to undo everything
1674                  */
1675                 res = bond_alb_init_slave(bond, new_slave);
1676                 if (res)
1677                         goto err_close;
1678         }
1679
1680         /* If the mode USES_PRIMARY, then the new slave gets the
1681          * master's promisc (and mc) settings only if it becomes the
1682          * curr_active_slave, and that is taken care of later when calling
1683          * bond_change_active()
1684          */
1685         if (!USES_PRIMARY(bond->params.mode)) {
1686                 /* set promiscuity level to new slave */
1687                 if (bond_dev->flags & IFF_PROMISC) {
1688                         res = dev_set_promiscuity(slave_dev, 1);
1689                         if (res)
1690                                 goto err_close;
1691                 }
1692
1693                 /* set allmulti level to new slave */
1694                 if (bond_dev->flags & IFF_ALLMULTI) {
1695                         res = dev_set_allmulti(slave_dev, 1);
1696                         if (res)
1697                                 goto err_close;
1698                 }
1699
1700                 netif_addr_lock_bh(bond_dev);
1701                 /* upload master's mc_list to new slave */
1702                 netdev_for_each_mc_addr(ha, bond_dev)
1703                         dev_mc_add(slave_dev, ha->addr);
1704                 netif_addr_unlock_bh(bond_dev);
1705         }
1706
1707         if (bond->params.mode == BOND_MODE_8023AD) {
1708                 /* add lacpdu mc addr to mc list */
1709                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1710
1711                 dev_mc_add(slave_dev, lacpdu_multicast);
1712         }
1713
1714         bond_add_vlans_on_slave(bond, slave_dev);
1715
1716         write_lock_bh(&bond->lock);
1717
1718         bond_attach_slave(bond, new_slave);
1719
1720         new_slave->delay = 0;
1721         new_slave->link_failure_count = 0;
1722
1723         write_unlock_bh(&bond->lock);
1724
1725         bond_compute_features(bond);
1726
1727         read_lock(&bond->lock);
1728
1729         new_slave->last_arp_rx = jiffies -
1730                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1731
1732         if (bond->params.miimon && !bond->params.use_carrier) {
1733                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1734
1735                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1736                         /*
1737                          * miimon is set but a bonded network driver
1738                          * does not support ETHTOOL/MII and
1739                          * arp_interval is not set.  Note: if
1740                          * use_carrier is enabled, we will never go
1741                          * here (because netif_carrier is always
1742                          * supported); thus, we don't need to change
1743                          * the messages for netif_carrier.
1744                          */
1745                         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",
1746                                bond_dev->name, slave_dev->name);
1747                 } else if (link_reporting == -1) {
1748                         /* unable get link status using mii/ethtool */
1749                         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",
1750                                    bond_dev->name, slave_dev->name);
1751                 }
1752         }
1753
1754         /* check for initial state */
1755         if (bond->params.miimon) {
1756                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1757                         if (bond->params.updelay) {
1758                                 new_slave->link = BOND_LINK_BACK;
1759                                 new_slave->delay = bond->params.updelay;
1760                         } else {
1761                                 new_slave->link = BOND_LINK_UP;
1762                         }
1763                 } else {
1764                         new_slave->link = BOND_LINK_DOWN;
1765                 }
1766         } else if (bond->params.arp_interval) {
1767                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1768                         BOND_LINK_UP : BOND_LINK_DOWN);
1769         } else {
1770                 new_slave->link = BOND_LINK_UP;
1771         }
1772
1773         if (new_slave->link != BOND_LINK_DOWN)
1774                 new_slave->jiffies = jiffies;
1775         pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1776                 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1777                         (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1778
1779         bond_update_speed_duplex(new_slave);
1780
1781         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1782                 /* if there is a primary slave, remember it */
1783                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1784                         bond->primary_slave = new_slave;
1785                         bond->force_primary = true;
1786                 }
1787         }
1788
1789         write_lock_bh(&bond->curr_slave_lock);
1790
1791         switch (bond->params.mode) {
1792         case BOND_MODE_ACTIVEBACKUP:
1793                 bond_set_slave_inactive_flags(new_slave);
1794                 bond_select_active_slave(bond);
1795                 break;
1796         case BOND_MODE_8023AD:
1797                 /* in 802.3ad mode, the internal mechanism
1798                  * will activate the slaves in the selected
1799                  * aggregator
1800                  */
1801                 bond_set_slave_inactive_flags(new_slave);
1802                 /* if this is the first slave */
1803                 if (bond->slave_cnt == 1) {
1804                         SLAVE_AD_INFO(new_slave).id = 1;
1805                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1806                          * can be called only after the mac address of the bond is set
1807                          */
1808                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1809                 } else {
1810                         SLAVE_AD_INFO(new_slave).id =
1811                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1812                 }
1813
1814                 bond_3ad_bind_slave(new_slave);
1815                 break;
1816         case BOND_MODE_TLB:
1817         case BOND_MODE_ALB:
1818                 bond_set_active_slave(new_slave);
1819                 bond_set_slave_inactive_flags(new_slave);
1820                 bond_select_active_slave(bond);
1821                 break;
1822         default:
1823                 pr_debug("This slave is always active in trunk mode\n");
1824
1825                 /* always active in trunk mode */
1826                 bond_set_active_slave(new_slave);
1827
1828                 /* In trunking mode there is little meaning to curr_active_slave
1829                  * anyway (it holds no special properties of the bond device),
1830                  * so we can change it without calling change_active_interface()
1831                  */
1832                 if (!bond->curr_active_slave)
1833                         bond->curr_active_slave = new_slave;
1834
1835                 break;
1836         } /* switch(bond_mode) */
1837
1838         write_unlock_bh(&bond->curr_slave_lock);
1839
1840         bond_set_carrier(bond);
1841
1842 #ifdef CONFIG_NET_POLL_CONTROLLER
1843         slave_dev->npinfo = bond_netpoll_info(bond);
1844         if (slave_dev->npinfo) {
1845                 if (slave_enable_netpoll(new_slave)) {
1846                         read_unlock(&bond->lock);
1847                         pr_info("Error, %s: master_dev is using netpoll, "
1848                                  "but new slave device does not support netpoll.\n",
1849                                  bond_dev->name);
1850                         res = -EBUSY;
1851                         goto err_detach;
1852                 }
1853         }
1854 #endif
1855
1856         read_unlock(&bond->lock);
1857
1858         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1859         if (res)
1860                 goto err_detach;
1861
1862         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1863                                          new_slave);
1864         if (res) {
1865                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1866                 goto err_dest_symlinks;
1867         }
1868
1869         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1870                 bond_dev->name, slave_dev->name,
1871                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1872                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1873
1874         /* enslave is successful */
1875         return 0;
1876
1877 /* Undo stages on error */
1878 err_dest_symlinks:
1879         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1880
1881 err_detach:
1882         write_lock_bh(&bond->lock);
1883         bond_detach_slave(bond, new_slave);
1884         write_unlock_bh(&bond->lock);
1885
1886 err_close:
1887         dev_close(slave_dev);
1888
1889 err_unset_master:
1890         netdev_set_bond_master(slave_dev, NULL);
1891
1892 err_restore_mac:
1893         if (!bond->params.fail_over_mac) {
1894                 /* XXX TODO - fom follow mode needs to change master's
1895                  * MAC if this slave's MAC is in use by the bond, or at
1896                  * least print a warning.
1897                  */
1898                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1899                 addr.sa_family = slave_dev->type;
1900                 dev_set_mac_address(slave_dev, &addr);
1901         }
1902
1903 err_restore_mtu:
1904         dev_set_mtu(slave_dev, new_slave->original_mtu);
1905
1906 err_free:
1907         kfree(new_slave);
1908
1909 err_undo_flags:
1910         bond_compute_features(bond);
1911
1912         return res;
1913 }
1914
1915 /*
1916  * Try to release the slave device <slave> from the bond device <master>
1917  * It is legal to access curr_active_slave without a lock because all the function
1918  * is write-locked.
1919  *
1920  * The rules for slave state should be:
1921  *   for Active/Backup:
1922  *     Active stays on all backups go down
1923  *   for Bonded connections:
1924  *     The first up interface should be left on and all others downed.
1925  */
1926 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1927 {
1928         struct bonding *bond = netdev_priv(bond_dev);
1929         struct slave *slave, *oldcurrent;
1930         struct sockaddr addr;
1931         netdev_features_t old_features = bond_dev->features;
1932
1933         /* slave is not a slave or master is not master of this slave */
1934         if (!(slave_dev->flags & IFF_SLAVE) ||
1935             (slave_dev->master != bond_dev)) {
1936                 pr_err("%s: Error: cannot release %s.\n",
1937                        bond_dev->name, slave_dev->name);
1938                 return -EINVAL;
1939         }
1940
1941         block_netpoll_tx();
1942         netdev_bonding_change(bond_dev, NETDEV_RELEASE);
1943         write_lock_bh(&bond->lock);
1944
1945         slave = bond_get_slave_by_dev(bond, slave_dev);
1946         if (!slave) {
1947                 /* not a slave of this bond */
1948                 pr_info("%s: %s not enslaved\n",
1949                         bond_dev->name, slave_dev->name);
1950                 write_unlock_bh(&bond->lock);
1951                 unblock_netpoll_tx();
1952                 return -EINVAL;
1953         }
1954
1955         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1956          * for this slave anymore.
1957          */
1958         netdev_rx_handler_unregister(slave_dev);
1959         write_unlock_bh(&bond->lock);
1960         synchronize_net();
1961         write_lock_bh(&bond->lock);
1962
1963         if (!bond->params.fail_over_mac) {
1964                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1965                     bond->slave_cnt > 1)
1966                         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",
1967                                    bond_dev->name, slave_dev->name,
1968                                    slave->perm_hwaddr,
1969                                    bond_dev->name, slave_dev->name);
1970         }
1971
1972         /* Inform AD package of unbinding of slave. */
1973         if (bond->params.mode == BOND_MODE_8023AD) {
1974                 /* must be called before the slave is
1975                  * detached from the list
1976                  */
1977                 bond_3ad_unbind_slave(slave);
1978         }
1979
1980         pr_info("%s: releasing %s interface %s\n",
1981                 bond_dev->name,
1982                 bond_is_active_slave(slave) ? "active" : "backup",
1983                 slave_dev->name);
1984
1985         oldcurrent = bond->curr_active_slave;
1986
1987         bond->current_arp_slave = NULL;
1988
1989         /* release the slave from its bond */
1990         bond_detach_slave(bond, slave);
1991
1992         if (bond->primary_slave == slave)
1993                 bond->primary_slave = NULL;
1994
1995         if (oldcurrent == slave)
1996                 bond_change_active_slave(bond, NULL);
1997
1998         if (bond_is_lb(bond)) {
1999                 /* Must be called only after the slave has been
2000                  * detached from the list and the curr_active_slave
2001                  * has been cleared (if our_slave == old_current),
2002                  * but before a new active slave is selected.
2003                  */
2004                 write_unlock_bh(&bond->lock);
2005                 bond_alb_deinit_slave(bond, slave);
2006                 write_lock_bh(&bond->lock);
2007         }
2008
2009         if (oldcurrent == slave) {
2010                 /*
2011                  * Note that we hold RTNL over this sequence, so there
2012                  * is no concern that another slave add/remove event
2013                  * will interfere.
2014                  */
2015                 write_unlock_bh(&bond->lock);
2016                 read_lock(&bond->lock);
2017                 write_lock_bh(&bond->curr_slave_lock);
2018
2019                 bond_select_active_slave(bond);
2020
2021                 write_unlock_bh(&bond->curr_slave_lock);
2022                 read_unlock(&bond->lock);
2023                 write_lock_bh(&bond->lock);
2024         }
2025
2026         if (bond->slave_cnt == 0) {
2027                 bond_set_carrier(bond);
2028
2029                 /* if the last slave was removed, zero the mac address
2030                  * of the master so it will be set by the application
2031                  * to the mac address of the first slave
2032                  */
2033                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2034
2035                 if (bond_vlan_used(bond)) {
2036                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2037                                    bond_dev->name, bond_dev->name);
2038                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2039                                    bond_dev->name);
2040                 }
2041         }
2042
2043         write_unlock_bh(&bond->lock);
2044         unblock_netpoll_tx();
2045
2046         if (bond->slave_cnt == 0)
2047                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2048
2049         bond_compute_features(bond);
2050         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2051             (old_features & NETIF_F_VLAN_CHALLENGED))
2052                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2053                         bond_dev->name, slave_dev->name, bond_dev->name);
2054
2055         /* must do this from outside any spinlocks */
2056         bond_destroy_slave_symlinks(bond_dev, slave_dev);
2057
2058         bond_del_vlans_from_slave(bond, slave_dev);
2059
2060         /* If the mode USES_PRIMARY, then we should only remove its
2061          * promisc and mc settings if it was the curr_active_slave, but that was
2062          * already taken care of above when we detached the slave
2063          */
2064         if (!USES_PRIMARY(bond->params.mode)) {
2065                 /* unset promiscuity level from slave */
2066                 if (bond_dev->flags & IFF_PROMISC)
2067                         dev_set_promiscuity(slave_dev, -1);
2068
2069                 /* unset allmulti level from slave */
2070                 if (bond_dev->flags & IFF_ALLMULTI)
2071                         dev_set_allmulti(slave_dev, -1);
2072
2073                 /* flush master's mc_list from slave */
2074                 netif_addr_lock_bh(bond_dev);
2075                 bond_mc_list_flush(bond_dev, slave_dev);
2076                 netif_addr_unlock_bh(bond_dev);
2077         }
2078
2079         netdev_set_bond_master(slave_dev, NULL);
2080
2081         slave_disable_netpoll(slave);
2082
2083         /* close slave before restoring its mac address */
2084         dev_close(slave_dev);
2085
2086         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2087                 /* restore original ("permanent") mac address */
2088                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2089                 addr.sa_family = slave_dev->type;
2090                 dev_set_mac_address(slave_dev, &addr);
2091         }
2092
2093         dev_set_mtu(slave_dev, slave->original_mtu);
2094
2095         slave_dev->priv_flags &= ~IFF_BONDING;
2096
2097         kfree(slave);
2098
2099         return 0;  /* deletion OK */
2100 }
2101
2102 /*
2103 * First release a slave and then destroy the bond if no more slaves are left.
2104 * Must be under rtnl_lock when this function is called.
2105 */
2106 static int  bond_release_and_destroy(struct net_device *bond_dev,
2107                                      struct net_device *slave_dev)
2108 {
2109         struct bonding *bond = netdev_priv(bond_dev);
2110         int ret;
2111
2112         ret = bond_release(bond_dev, slave_dev);
2113         if ((ret == 0) && (bond->slave_cnt == 0)) {
2114                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2115                 pr_info("%s: destroying bond %s.\n",
2116                         bond_dev->name, bond_dev->name);
2117                 unregister_netdevice(bond_dev);
2118         }
2119         return ret;
2120 }
2121
2122 /*
2123  * This function releases all slaves.
2124  */
2125 static int bond_release_all(struct net_device *bond_dev)
2126 {
2127         struct bonding *bond = netdev_priv(bond_dev);
2128         struct slave *slave;
2129         struct net_device *slave_dev;
2130         struct sockaddr addr;
2131
2132         write_lock_bh(&bond->lock);
2133
2134         netif_carrier_off(bond_dev);
2135
2136         if (bond->slave_cnt == 0)
2137                 goto out;
2138
2139         bond->current_arp_slave = NULL;
2140         bond->primary_slave = NULL;
2141         bond_change_active_slave(bond, NULL);
2142
2143         while ((slave = bond->first_slave) != NULL) {
2144                 /* Inform AD package of unbinding of slave
2145                  * before slave is detached from the list.
2146                  */
2147                 if (bond->params.mode == BOND_MODE_8023AD)
2148                         bond_3ad_unbind_slave(slave);
2149
2150                 slave_dev = slave->dev;
2151                 bond_detach_slave(bond, slave);
2152
2153                 /* now that the slave is detached, unlock and perform
2154                  * all the undo steps that should not be called from
2155                  * within a lock.
2156                  */
2157                 write_unlock_bh(&bond->lock);
2158
2159                 /* unregister rx_handler early so bond_handle_frame wouldn't
2160                  * be called for this slave anymore.
2161                  */
2162                 netdev_rx_handler_unregister(slave_dev);
2163                 synchronize_net();
2164
2165                 if (bond_is_lb(bond)) {
2166                         /* must be called only after the slave
2167                          * has been detached from the list
2168                          */
2169                         bond_alb_deinit_slave(bond, slave);
2170                 }
2171
2172                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2173                 bond_del_vlans_from_slave(bond, slave_dev);
2174
2175                 /* If the mode USES_PRIMARY, then we should only remove its
2176                  * promisc and mc settings if it was the curr_active_slave, but that was
2177                  * already taken care of above when we detached the slave
2178                  */
2179                 if (!USES_PRIMARY(bond->params.mode)) {
2180                         /* unset promiscuity level from slave */
2181                         if (bond_dev->flags & IFF_PROMISC)
2182                                 dev_set_promiscuity(slave_dev, -1);
2183
2184                         /* unset allmulti level from slave */
2185                         if (bond_dev->flags & IFF_ALLMULTI)
2186                                 dev_set_allmulti(slave_dev, -1);
2187
2188                         /* flush master's mc_list from slave */
2189                         netif_addr_lock_bh(bond_dev);
2190                         bond_mc_list_flush(bond_dev, slave_dev);
2191                         netif_addr_unlock_bh(bond_dev);
2192                 }
2193
2194                 netdev_set_bond_master(slave_dev, NULL);
2195
2196                 slave_disable_netpoll(slave);
2197
2198                 /* close slave before restoring its mac address */
2199                 dev_close(slave_dev);
2200
2201                 if (!bond->params.fail_over_mac) {
2202                         /* restore original ("permanent") mac address*/
2203                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2204                         addr.sa_family = slave_dev->type;
2205                         dev_set_mac_address(slave_dev, &addr);
2206                 }
2207
2208                 kfree(slave);
2209
2210                 /* re-acquire the lock before getting the next slave */
2211                 write_lock_bh(&bond->lock);
2212         }
2213
2214         /* zero the mac address of the master so it will be
2215          * set by the application to the mac address of the
2216          * first slave
2217          */
2218         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2219
2220         if (bond_vlan_used(bond)) {
2221                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2222                            bond_dev->name, bond_dev->name);
2223                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2224                            bond_dev->name);
2225         }
2226
2227         pr_info("%s: released all slaves\n", bond_dev->name);
2228
2229 out:
2230         write_unlock_bh(&bond->lock);
2231
2232         bond_compute_features(bond);
2233
2234         return 0;
2235 }
2236
2237 /*
2238  * This function changes the active slave to slave <slave_dev>.
2239  * It returns -EINVAL in the following cases.
2240  *  - <slave_dev> is not found in the list.
2241  *  - There is not active slave now.
2242  *  - <slave_dev> is already active.
2243  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2244  *  - <slave_dev> is not running.
2245  * In these cases, this function does nothing.
2246  * In the other cases, current_slave pointer is changed and 0 is returned.
2247  */
2248 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2249 {
2250         struct bonding *bond = netdev_priv(bond_dev);
2251         struct slave *old_active = NULL;
2252         struct slave *new_active = NULL;
2253         int res = 0;
2254
2255         if (!USES_PRIMARY(bond->params.mode))
2256                 return -EINVAL;
2257
2258         /* Verify that master_dev is indeed the master of slave_dev */
2259         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2260                 return -EINVAL;
2261
2262         read_lock(&bond->lock);
2263
2264         read_lock(&bond->curr_slave_lock);
2265         old_active = bond->curr_active_slave;
2266         read_unlock(&bond->curr_slave_lock);
2267
2268         new_active = bond_get_slave_by_dev(bond, slave_dev);
2269
2270         /*
2271          * Changing to the current active: do nothing; return success.
2272          */
2273         if (new_active && (new_active == old_active)) {
2274                 read_unlock(&bond->lock);
2275                 return 0;
2276         }
2277
2278         if ((new_active) &&
2279             (old_active) &&
2280             (new_active->link == BOND_LINK_UP) &&
2281             IS_UP(new_active->dev)) {
2282                 block_netpoll_tx();
2283                 write_lock_bh(&bond->curr_slave_lock);
2284                 bond_change_active_slave(bond, new_active);
2285                 write_unlock_bh(&bond->curr_slave_lock);
2286                 unblock_netpoll_tx();
2287         } else
2288                 res = -EINVAL;
2289
2290         read_unlock(&bond->lock);
2291
2292         return res;
2293 }
2294
2295 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2296 {
2297         struct bonding *bond = netdev_priv(bond_dev);
2298
2299         info->bond_mode = bond->params.mode;
2300         info->miimon = bond->params.miimon;
2301
2302         read_lock(&bond->lock);
2303         info->num_slaves = bond->slave_cnt;
2304         read_unlock(&bond->lock);
2305
2306         return 0;
2307 }
2308
2309 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2310 {
2311         struct bonding *bond = netdev_priv(bond_dev);
2312         struct slave *slave;
2313         int i, res = -ENODEV;
2314
2315         read_lock(&bond->lock);
2316
2317         bond_for_each_slave(bond, slave, i) {
2318                 if (i == (int)info->slave_id) {
2319                         res = 0;
2320                         strcpy(info->slave_name, slave->dev->name);
2321                         info->link = slave->link;
2322                         info->state = bond_slave_state(slave);
2323                         info->link_failure_count = slave->link_failure_count;
2324                         break;
2325                 }
2326         }
2327
2328         read_unlock(&bond->lock);
2329
2330         return res;
2331 }
2332
2333 /*-------------------------------- Monitoring -------------------------------*/
2334
2335
2336 static int bond_miimon_inspect(struct bonding *bond)
2337 {
2338         struct slave *slave;
2339         int i, link_state, commit = 0;
2340         bool ignore_updelay;
2341
2342         ignore_updelay = !bond->curr_active_slave ? true : false;
2343
2344         bond_for_each_slave(bond, slave, i) {
2345                 slave->new_link = BOND_LINK_NOCHANGE;
2346
2347                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2348
2349                 switch (slave->link) {
2350                 case BOND_LINK_UP:
2351                         if (link_state)
2352                                 continue;
2353
2354                         slave->link = BOND_LINK_FAIL;
2355                         slave->delay = bond->params.downdelay;
2356                         if (slave->delay) {
2357                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2358                                         bond->dev->name,
2359                                         (bond->params.mode ==
2360                                          BOND_MODE_ACTIVEBACKUP) ?
2361                                         (bond_is_active_slave(slave) ?
2362                                          "active " : "backup ") : "",
2363                                         slave->dev->name,
2364                                         bond->params.downdelay * bond->params.miimon);
2365                         }
2366                         /*FALLTHRU*/
2367                 case BOND_LINK_FAIL:
2368                         if (link_state) {
2369                                 /*
2370                                  * recovered before downdelay expired
2371                                  */
2372                                 slave->link = BOND_LINK_UP;
2373                                 slave->jiffies = jiffies;
2374                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2375                                         bond->dev->name,
2376                                         (bond->params.downdelay - slave->delay) *
2377                                         bond->params.miimon,
2378                                         slave->dev->name);
2379                                 continue;
2380                         }
2381
2382                         if (slave->delay <= 0) {
2383                                 slave->new_link = BOND_LINK_DOWN;
2384                                 commit++;
2385                                 continue;
2386                         }
2387
2388                         slave->delay--;
2389                         break;
2390
2391                 case BOND_LINK_DOWN:
2392                         if (!link_state)
2393                                 continue;
2394
2395                         slave->link = BOND_LINK_BACK;
2396                         slave->delay = bond->params.updelay;
2397
2398                         if (slave->delay) {
2399                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2400                                         bond->dev->name, slave->dev->name,
2401                                         ignore_updelay ? 0 :
2402                                         bond->params.updelay *
2403                                         bond->params.miimon);
2404                         }
2405                         /*FALLTHRU*/
2406                 case BOND_LINK_BACK:
2407                         if (!link_state) {
2408                                 slave->link = BOND_LINK_DOWN;
2409                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2410                                         bond->dev->name,
2411                                         (bond->params.updelay - slave->delay) *
2412                                         bond->params.miimon,
2413                                         slave->dev->name);
2414
2415                                 continue;
2416                         }
2417
2418                         if (ignore_updelay)
2419                                 slave->delay = 0;
2420
2421                         if (slave->delay <= 0) {
2422                                 slave->new_link = BOND_LINK_UP;
2423                                 commit++;
2424                                 ignore_updelay = false;
2425                                 continue;
2426                         }
2427
2428                         slave->delay--;
2429                         break;
2430                 }
2431         }
2432
2433         return commit;
2434 }
2435
2436 static void bond_miimon_commit(struct bonding *bond)
2437 {
2438         struct slave *slave;
2439         int i;
2440
2441         bond_for_each_slave(bond, slave, i) {
2442                 switch (slave->new_link) {
2443                 case BOND_LINK_NOCHANGE:
2444                         continue;
2445
2446                 case BOND_LINK_UP:
2447                         slave->link = BOND_LINK_UP;
2448                         slave->jiffies = jiffies;
2449
2450                         if (bond->params.mode == BOND_MODE_8023AD) {
2451                                 /* prevent it from being the active one */
2452                                 bond_set_backup_slave(slave);
2453                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2454                                 /* make it immediately active */
2455                                 bond_set_active_slave(slave);
2456                         } else if (slave != bond->primary_slave) {
2457                                 /* prevent it from being the active one */
2458                                 bond_set_backup_slave(slave);
2459                         }
2460
2461                         bond_update_speed_duplex(slave);
2462
2463                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2464                                 bond->dev->name, slave->dev->name,
2465                                 slave->speed, slave->duplex ? "full" : "half");
2466
2467                         /* notify ad that the link status has changed */
2468                         if (bond->params.mode == BOND_MODE_8023AD)
2469                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2470
2471                         if (bond_is_lb(bond))
2472                                 bond_alb_handle_link_change(bond, slave,
2473                                                             BOND_LINK_UP);
2474
2475                         if (!bond->curr_active_slave ||
2476                             (slave == bond->primary_slave))
2477                                 goto do_failover;
2478
2479                         continue;
2480
2481                 case BOND_LINK_DOWN:
2482                         if (slave->link_failure_count < UINT_MAX)
2483                                 slave->link_failure_count++;
2484
2485                         slave->link = BOND_LINK_DOWN;
2486
2487                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2488                             bond->params.mode == BOND_MODE_8023AD)
2489                                 bond_set_slave_inactive_flags(slave);
2490
2491                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2492                                 bond->dev->name, slave->dev->name);
2493
2494                         if (bond->params.mode == BOND_MODE_8023AD)
2495                                 bond_3ad_handle_link_change(slave,
2496                                                             BOND_LINK_DOWN);
2497
2498                         if (bond_is_lb(bond))
2499                                 bond_alb_handle_link_change(bond, slave,
2500                                                             BOND_LINK_DOWN);
2501
2502                         if (slave == bond->curr_active_slave)
2503                                 goto do_failover;
2504
2505                         continue;
2506
2507                 default:
2508                         pr_err("%s: invalid new link %d on slave %s\n",
2509                                bond->dev->name, slave->new_link,
2510                                slave->dev->name);
2511                         slave->new_link = BOND_LINK_NOCHANGE;
2512
2513                         continue;
2514                 }
2515
2516 do_failover:
2517                 ASSERT_RTNL();
2518                 block_netpoll_tx();
2519                 write_lock_bh(&bond->curr_slave_lock);
2520                 bond_select_active_slave(bond);
2521                 write_unlock_bh(&bond->curr_slave_lock);
2522                 unblock_netpoll_tx();
2523         }
2524
2525         bond_set_carrier(bond);
2526 }
2527
2528 /*
2529  * bond_mii_monitor
2530  *
2531  * Really a wrapper that splits the mii monitor into two phases: an
2532  * inspection, then (if inspection indicates something needs to be done)
2533  * an acquisition of appropriate locks followed by a commit phase to
2534  * implement whatever link state changes are indicated.
2535  */
2536 void bond_mii_monitor(struct work_struct *work)
2537 {
2538         struct bonding *bond = container_of(work, struct bonding,
2539                                             mii_work.work);
2540         bool should_notify_peers = false;
2541         unsigned long delay;
2542
2543         read_lock(&bond->lock);
2544
2545         delay = msecs_to_jiffies(bond->params.miimon);
2546
2547         if (bond->slave_cnt == 0)
2548                 goto re_arm;
2549
2550         should_notify_peers = bond_should_notify_peers(bond);
2551
2552         if (bond_miimon_inspect(bond)) {
2553                 read_unlock(&bond->lock);
2554
2555                 /* Race avoidance with bond_close cancel of workqueue */
2556                 if (!rtnl_trylock()) {
2557                         read_lock(&bond->lock);
2558                         delay = 1;
2559                         should_notify_peers = false;
2560                         goto re_arm;
2561                 }
2562
2563                 read_lock(&bond->lock);
2564
2565                 bond_miimon_commit(bond);
2566
2567                 read_unlock(&bond->lock);
2568                 rtnl_unlock();  /* might sleep, hold no other locks */
2569                 read_lock(&bond->lock);
2570         }
2571
2572 re_arm:
2573         if (bond->params.miimon)
2574                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2575
2576         read_unlock(&bond->lock);
2577
2578         if (should_notify_peers) {
2579                 if (!rtnl_trylock()) {
2580                         read_lock(&bond->lock);
2581                         bond->send_peer_notif++;
2582                         read_unlock(&bond->lock);
2583                         return;
2584                 }
2585                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
2586                 rtnl_unlock();
2587         }
2588 }
2589
2590 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2591 {
2592         struct vlan_entry *vlan;
2593         struct net_device *vlan_dev;
2594
2595         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2596                 return 1;
2597
2598         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2599                 rcu_read_lock();
2600                 vlan_dev = __vlan_find_dev_deep(bond->dev, vlan->vlan_id);
2601                 rcu_read_unlock();
2602                 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
2603                         return 1;
2604         }
2605
2606         return 0;
2607 }
2608
2609 /*
2610  * We go to the (large) trouble of VLAN tagging ARP frames because
2611  * switches in VLAN mode (especially if ports are configured as
2612  * "native" to a VLAN) might not pass non-tagged frames.
2613  */
2614 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2615 {
2616         struct sk_buff *skb;
2617
2618         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2619                  slave_dev->name, dest_ip, src_ip, vlan_id);
2620
2621         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2622                          NULL, slave_dev->dev_addr, NULL);
2623
2624         if (!skb) {
2625                 pr_err("ARP packet allocation failed\n");
2626                 return;
2627         }
2628         if (vlan_id) {
2629                 skb = vlan_put_tag(skb, vlan_id);
2630                 if (!skb) {
2631                         pr_err("failed to insert VLAN tag\n");
2632                         return;
2633                 }
2634         }
2635         arp_xmit(skb);
2636 }
2637
2638
2639 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2640 {
2641         int i, vlan_id;
2642         __be32 *targets = bond->params.arp_targets;
2643         struct vlan_entry *vlan;
2644         struct net_device *vlan_dev = NULL;
2645         struct rtable *rt;
2646
2647         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2648                 __be32 addr;
2649                 if (!targets[i])
2650                         break;
2651                 pr_debug("basa: target %x\n", targets[i]);
2652                 if (!bond_vlan_used(bond)) {
2653                         pr_debug("basa: empty vlan: arp_send\n");
2654                         addr = bond_confirm_addr(bond->dev, targets[i], 0);
2655                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2656                                       addr, 0);
2657                         continue;
2658                 }
2659
2660                 /*
2661                  * If VLANs are configured, we do a route lookup to
2662                  * determine which VLAN interface would be used, so we
2663                  * can tag the ARP with the proper VLAN tag.
2664                  */
2665                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2666                                      RTO_ONLINK, 0);
2667                 if (IS_ERR(rt)) {
2668                         if (net_ratelimit()) {
2669                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2670                                            bond->dev->name, &targets[i]);
2671                         }
2672                         continue;
2673                 }
2674
2675                 /*
2676                  * This target is not on a VLAN
2677                  */
2678                 if (rt->dst.dev == bond->dev) {
2679                         ip_rt_put(rt);
2680                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2681                         addr = bond_confirm_addr(bond->dev, targets[i], 0);
2682                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2683                                       addr, 0);
2684                         continue;
2685                 }
2686
2687                 vlan_id = 0;
2688                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2689                         rcu_read_lock();
2690                         vlan_dev = __vlan_find_dev_deep(bond->dev,
2691                                                         vlan->vlan_id);
2692                         rcu_read_unlock();
2693                         if (vlan_dev == rt->dst.dev) {
2694                                 vlan_id = vlan->vlan_id;
2695                                 pr_debug("basa: vlan match on %s %d\n",
2696                                        vlan_dev->name, vlan_id);
2697                                 break;
2698                         }
2699                 }
2700
2701                 if (vlan_id && vlan_dev) {
2702                         ip_rt_put(rt);
2703                         addr = bond_confirm_addr(vlan_dev, targets[i], 0);
2704                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2705                                       addr, vlan_id);
2706                         continue;
2707                 }
2708
2709                 if (net_ratelimit()) {
2710                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2711                                    bond->dev->name, &targets[i],
2712                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2713                 }
2714                 ip_rt_put(rt);
2715         }
2716 }
2717
2718 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2719 {
2720         int i;
2721         __be32 *targets = bond->params.arp_targets;
2722
2723         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2724                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2725                          &sip, &tip, i, &targets[i],
2726                          bond_has_this_ip(bond, tip));
2727                 if (sip == targets[i]) {
2728                         if (bond_has_this_ip(bond, tip))
2729                                 slave->last_arp_rx = jiffies;
2730                         return;
2731                 }
2732         }
2733 }
2734
2735 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,
2736                          struct slave *slave)
2737 {
2738         struct arphdr *arp;
2739         unsigned char *arp_ptr;
2740         __be32 sip, tip;
2741
2742         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2743                 return;
2744
2745         read_lock(&bond->lock);
2746
2747         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2748                  bond->dev->name, skb->dev->name);
2749
2750         if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
2751                 goto out_unlock;
2752
2753         arp = arp_hdr(skb);
2754         if (arp->ar_hln != bond->dev->addr_len ||
2755             skb->pkt_type == PACKET_OTHERHOST ||
2756             skb->pkt_type == PACKET_LOOPBACK ||
2757             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2758             arp->ar_pro != htons(ETH_P_IP) ||
2759             arp->ar_pln != 4)
2760                 goto out_unlock;
2761
2762         arp_ptr = (unsigned char *)(arp + 1);
2763         arp_ptr += bond->dev->addr_len;
2764         memcpy(&sip, arp_ptr, 4);
2765         arp_ptr += 4 + bond->dev->addr_len;
2766         memcpy(&tip, arp_ptr, 4);
2767
2768         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2769                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2770                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2771                  &sip, &tip);
2772
2773         /*
2774          * Backup slaves won't see the ARP reply, but do come through
2775          * here for each ARP probe (so we swap the sip/tip to validate
2776          * the probe).  In a "redundant switch, common router" type of
2777          * configuration, the ARP probe will (hopefully) travel from
2778          * the active, through one switch, the router, then the other
2779          * switch before reaching the backup.
2780          */
2781         if (bond_is_active_slave(slave))
2782                 bond_validate_arp(bond, slave, sip, tip);
2783         else
2784                 bond_validate_arp(bond, slave, tip, sip);
2785
2786 out_unlock:
2787         read_unlock(&bond->lock);
2788 }
2789
2790 /*
2791  * this function is called regularly to monitor each slave's link
2792  * ensuring that traffic is being sent and received when arp monitoring
2793  * is used in load-balancing mode. if the adapter has been dormant, then an
2794  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2795  * arp monitoring in active backup mode.
2796  */
2797 void bond_loadbalance_arp_mon(struct work_struct *work)
2798 {
2799         struct bonding *bond = container_of(work, struct bonding,
2800                                             arp_work.work);
2801         struct slave *slave, *oldcurrent;
2802         int do_failover = 0;
2803         int delta_in_ticks;
2804         int i;
2805
2806         read_lock(&bond->lock);
2807
2808         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2809
2810         if (bond->slave_cnt == 0)
2811                 goto re_arm;
2812
2813         read_lock(&bond->curr_slave_lock);
2814         oldcurrent = bond->curr_active_slave;
2815         read_unlock(&bond->curr_slave_lock);
2816
2817         /* see if any of the previous devices are up now (i.e. they have
2818          * xmt and rcv traffic). the curr_active_slave does not come into
2819          * the picture unless it is null. also, slave->jiffies is not needed
2820          * here because we send an arp on each slave and give a slave as
2821          * long as it needs to get the tx/rx within the delta.
2822          * TODO: what about up/down delay in arp mode? it wasn't here before
2823          *       so it can wait
2824          */
2825         bond_for_each_slave(bond, slave, i) {
2826                 unsigned long trans_start = dev_trans_start(slave->dev);
2827
2828                 if (slave->link != BOND_LINK_UP) {
2829                         if (time_in_range(jiffies,
2830                                 trans_start - delta_in_ticks,
2831                                 trans_start + delta_in_ticks) &&
2832                             time_in_range(jiffies,
2833                                 slave->dev->last_rx - delta_in_ticks,
2834                                 slave->dev->last_rx + delta_in_ticks)) {
2835
2836                                 slave->link  = BOND_LINK_UP;
2837                                 bond_set_active_slave(slave);
2838
2839                                 /* primary_slave has no meaning in round-robin
2840                                  * mode. the window of a slave being up and
2841                                  * curr_active_slave being null after enslaving
2842                                  * is closed.
2843                                  */
2844                                 if (!oldcurrent) {
2845                                         pr_info("%s: link status definitely up for interface %s, ",
2846                                                 bond->dev->name,
2847                                                 slave->dev->name);
2848                                         do_failover = 1;
2849                                 } else {
2850                                         pr_info("%s: interface %s is now up\n",
2851                                                 bond->dev->name,
2852                                                 slave->dev->name);
2853                                 }
2854                         }
2855                 } else {
2856                         /* slave->link == BOND_LINK_UP */
2857
2858                         /* not all switches will respond to an arp request
2859                          * when the source ip is 0, so don't take the link down
2860                          * if we don't know our ip yet
2861                          */
2862                         if (!time_in_range(jiffies,
2863                                 trans_start - delta_in_ticks,
2864                                 trans_start + 2 * delta_in_ticks) ||
2865                             !time_in_range(jiffies,
2866                                 slave->dev->last_rx - delta_in_ticks,
2867                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2868
2869                                 slave->link  = BOND_LINK_DOWN;
2870                                 bond_set_backup_slave(slave);
2871
2872                                 if (slave->link_failure_count < UINT_MAX)
2873                                         slave->link_failure_count++;
2874
2875                                 pr_info("%s: interface %s is now down.\n",
2876                                         bond->dev->name,
2877                                         slave->dev->name);
2878
2879                                 if (slave == oldcurrent)
2880                                         do_failover = 1;
2881                         }
2882                 }
2883
2884                 /* note: if switch is in round-robin mode, all links
2885                  * must tx arp to ensure all links rx an arp - otherwise
2886                  * links may oscillate or not come up at all; if switch is
2887                  * in something like xor mode, there is nothing we can
2888                  * do - all replies will be rx'ed on same link causing slaves
2889                  * to be unstable during low/no traffic periods
2890                  */
2891                 if (IS_UP(slave->dev))
2892                         bond_arp_send_all(bond, slave);
2893         }
2894
2895         if (do_failover) {
2896                 block_netpoll_tx();
2897                 write_lock_bh(&bond->curr_slave_lock);
2898
2899                 bond_select_active_slave(bond);
2900
2901                 write_unlock_bh(&bond->curr_slave_lock);
2902                 unblock_netpoll_tx();
2903         }
2904
2905 re_arm:
2906         if (bond->params.arp_interval)
2907                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2908
2909         read_unlock(&bond->lock);
2910 }
2911
2912 /*
2913  * Called to inspect slaves for active-backup mode ARP monitor link state
2914  * changes.  Sets new_link in slaves to specify what action should take
2915  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2916  * to link states must be committed.
2917  *
2918  * Called with bond->lock held for read.
2919  */
2920 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2921 {
2922         struct slave *slave;
2923         int i, commit = 0;
2924         unsigned long trans_start;
2925
2926         bond_for_each_slave(bond, slave, i) {
2927                 slave->new_link = BOND_LINK_NOCHANGE;
2928
2929                 if (slave->link != BOND_LINK_UP) {
2930                         if (time_in_range(jiffies,
2931                                 slave_last_rx(bond, slave) - delta_in_ticks,
2932                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2933
2934                                 slave->new_link = BOND_LINK_UP;
2935                                 commit++;
2936                         }
2937
2938                         continue;
2939                 }
2940
2941                 /*
2942                  * Give slaves 2*delta after being enslaved or made
2943                  * active.  This avoids bouncing, as the last receive
2944                  * times need a full ARP monitor cycle to be updated.
2945                  */
2946                 if (time_in_range(jiffies,
2947                                   slave->jiffies - delta_in_ticks,
2948                                   slave->jiffies + 2 * delta_in_ticks))
2949                         continue;
2950
2951                 /*
2952                  * Backup slave is down if:
2953                  * - No current_arp_slave AND
2954                  * - more than 3*delta since last receive AND
2955                  * - the bond has an IP address
2956                  *
2957                  * Note: a non-null current_arp_slave indicates
2958                  * the curr_active_slave went down and we are
2959                  * searching for a new one; under this condition
2960                  * we only take the curr_active_slave down - this
2961                  * gives each slave a chance to tx/rx traffic
2962                  * before being taken out
2963                  */
2964                 if (!bond_is_active_slave(slave) &&
2965                     !bond->current_arp_slave &&
2966                     !time_in_range(jiffies,
2967                         slave_last_rx(bond, slave) - delta_in_ticks,
2968                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2969
2970                         slave->new_link = BOND_LINK_DOWN;
2971                         commit++;
2972                 }
2973
2974                 /*
2975                  * Active slave is down if:
2976                  * - more than 2*delta since transmitting OR
2977                  * - (more than 2*delta since receive AND
2978                  *    the bond has an IP address)
2979                  */
2980                 trans_start = dev_trans_start(slave->dev);
2981                 if (bond_is_active_slave(slave) &&
2982                     (!time_in_range(jiffies,
2983                         trans_start - delta_in_ticks,
2984                         trans_start + 2 * delta_in_ticks) ||
2985                      !time_in_range(jiffies,
2986                         slave_last_rx(bond, slave) - delta_in_ticks,
2987                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2988
2989                         slave->new_link = BOND_LINK_DOWN;
2990                         commit++;
2991                 }
2992         }
2993
2994         return commit;
2995 }
2996
2997 /*
2998  * Called to commit link state changes noted by inspection step of
2999  * active-backup mode ARP monitor.
3000  *
3001  * Called with RTNL and bond->lock for read.
3002  */
3003 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3004 {
3005         struct slave *slave;
3006         int i;
3007         unsigned long trans_start;
3008
3009         bond_for_each_slave(bond, slave, i) {
3010                 switch (slave->new_link) {
3011                 case BOND_LINK_NOCHANGE:
3012                         continue;
3013
3014                 case BOND_LINK_UP:
3015                         trans_start = dev_trans_start(slave->dev);
3016                         if ((!bond->curr_active_slave &&
3017                              time_in_range(jiffies,
3018                                            trans_start - delta_in_ticks,
3019                                            trans_start + delta_in_ticks)) ||
3020                             bond->curr_active_slave != slave) {
3021                                 slave->link = BOND_LINK_UP;
3022                                 if (bond->current_arp_slave) {
3023                                         bond_set_slave_inactive_flags(
3024                                                 bond->current_arp_slave);
3025                                         bond->current_arp_slave = NULL;
3026                                 }
3027
3028                                 pr_info("%s: link status definitely up for interface %s.\n",
3029                                         bond->dev->name, slave->dev->name);
3030
3031                                 if (!bond->curr_active_slave ||
3032                                     (slave == bond->primary_slave))
3033                                         goto do_failover;
3034
3035                         }
3036
3037                         continue;
3038
3039                 case BOND_LINK_DOWN:
3040                         if (slave->link_failure_count < UINT_MAX)
3041                                 slave->link_failure_count++;
3042
3043                         slave->link = BOND_LINK_DOWN;
3044                         bond_set_slave_inactive_flags(slave);
3045
3046                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3047                                 bond->dev->name, slave->dev->name);
3048
3049                         if (slave == bond->curr_active_slave) {
3050                                 bond->current_arp_slave = NULL;
3051                                 goto do_failover;
3052                         }
3053
3054                         continue;
3055
3056                 default:
3057                         pr_err("%s: impossible: new_link %d on slave %s\n",
3058                                bond->dev->name, slave->new_link,
3059                                slave->dev->name);
3060                         continue;
3061                 }
3062
3063 do_failover:
3064                 ASSERT_RTNL();
3065                 block_netpoll_tx();
3066                 write_lock_bh(&bond->curr_slave_lock);
3067                 bond_select_active_slave(bond);
3068                 write_unlock_bh(&bond->curr_slave_lock);
3069                 unblock_netpoll_tx();
3070         }
3071
3072         bond_set_carrier(bond);
3073 }
3074
3075 /*
3076  * Send ARP probes for active-backup mode ARP monitor.
3077  *
3078  * Called with bond->lock held for read.
3079  */
3080 static void bond_ab_arp_probe(struct bonding *bond)
3081 {
3082         struct slave *slave;
3083         int i;
3084
3085         read_lock(&bond->curr_slave_lock);
3086
3087         if (bond->current_arp_slave && bond->curr_active_slave)
3088                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3089                         bond->current_arp_slave->dev->name,
3090                         bond->curr_active_slave->dev->name);
3091
3092         if (bond->curr_active_slave) {
3093                 bond_arp_send_all(bond, bond->curr_active_slave);
3094                 read_unlock(&bond->curr_slave_lock);
3095                 return;
3096         }
3097
3098         read_unlock(&bond->curr_slave_lock);
3099
3100         /* if we don't have a curr_active_slave, search for the next available
3101          * backup slave from the current_arp_slave and make it the candidate
3102          * for becoming the curr_active_slave
3103          */
3104
3105         if (!bond->current_arp_slave) {
3106                 bond->current_arp_slave = bond->first_slave;
3107                 if (!bond->current_arp_slave)
3108                         return;
3109         }
3110
3111         bond_set_slave_inactive_flags(bond->current_arp_slave);
3112
3113         /* search for next candidate */
3114         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3115                 if (IS_UP(slave->dev)) {
3116                         slave->link = BOND_LINK_BACK;
3117                         bond_set_slave_active_flags(slave);
3118                         bond_arp_send_all(bond, slave);
3119                         slave->jiffies = jiffies;
3120                         bond->current_arp_slave = slave;
3121                         break;
3122                 }
3123
3124                 /* if the link state is up at this point, we
3125                  * mark it down - this can happen if we have
3126                  * simultaneous link failures and
3127                  * reselect_active_interface doesn't make this
3128                  * one the current slave so it is still marked
3129                  * up when it is actually down
3130                  */
3131                 if (slave->link == BOND_LINK_UP) {
3132                         slave->link = BOND_LINK_DOWN;
3133                         if (slave->link_failure_count < UINT_MAX)
3134                                 slave->link_failure_count++;
3135
3136                         bond_set_slave_inactive_flags(slave);
3137
3138                         pr_info("%s: backup interface %s is now down.\n",
3139                                 bond->dev->name, slave->dev->name);
3140                 }
3141         }
3142 }
3143
3144 void bond_activebackup_arp_mon(struct work_struct *work)
3145 {
3146         struct bonding *bond = container_of(work, struct bonding,
3147                                             arp_work.work);
3148         bool should_notify_peers = false;
3149         int delta_in_ticks;
3150
3151         read_lock(&bond->lock);
3152
3153         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3154
3155         if (bond->slave_cnt == 0)
3156                 goto re_arm;
3157
3158         should_notify_peers = bond_should_notify_peers(bond);
3159
3160         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3161                 read_unlock(&bond->lock);
3162
3163                 /* Race avoidance with bond_close flush of workqueue */
3164                 if (!rtnl_trylock()) {
3165                         read_lock(&bond->lock);
3166                         delta_in_ticks = 1;
3167                         should_notify_peers = false;
3168                         goto re_arm;
3169                 }
3170
3171                 read_lock(&bond->lock);
3172
3173                 bond_ab_arp_commit(bond, delta_in_ticks);
3174
3175                 read_unlock(&bond->lock);
3176                 rtnl_unlock();
3177                 read_lock(&bond->lock);
3178         }
3179
3180         bond_ab_arp_probe(bond);
3181
3182 re_arm:
3183         if (bond->params.arp_interval)
3184                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3185
3186         read_unlock(&bond->lock);
3187
3188         if (should_notify_peers) {
3189                 if (!rtnl_trylock()) {
3190                         read_lock(&bond->lock);
3191                         bond->send_peer_notif++;
3192                         read_unlock(&bond->lock);
3193                         return;
3194                 }
3195                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
3196                 rtnl_unlock();
3197         }
3198 }
3199
3200 /*-------------------------- netdev event handling --------------------------*/
3201
3202 /*
3203  * Change device name
3204  */
3205 static int bond_event_changename(struct bonding *bond)
3206 {
3207         bond_remove_proc_entry(bond);
3208         bond_create_proc_entry(bond);
3209
3210         bond_debug_reregister(bond);
3211
3212         return NOTIFY_DONE;
3213 }
3214
3215 static int bond_master_netdev_event(unsigned long event,
3216                                     struct net_device *bond_dev)
3217 {
3218         struct bonding *event_bond = netdev_priv(bond_dev);
3219
3220         switch (event) {
3221         case NETDEV_CHANGENAME:
3222                 return bond_event_changename(event_bond);
3223         default:
3224                 break;
3225         }
3226
3227         return NOTIFY_DONE;
3228 }
3229
3230 static int bond_slave_netdev_event(unsigned long event,
3231                                    struct net_device *slave_dev)
3232 {
3233         struct net_device *bond_dev = slave_dev->master;
3234         struct bonding *bond = netdev_priv(bond_dev);
3235         struct slave *slave = NULL;
3236
3237         switch (event) {
3238         case NETDEV_UNREGISTER:
3239                 if (bond_dev) {
3240                         if (bond->setup_by_slave)
3241                                 bond_release_and_destroy(bond_dev, slave_dev);
3242                         else
3243                                 bond_release(bond_dev, slave_dev);
3244                 }
3245                 break;
3246         case NETDEV_UP:
3247         case NETDEV_CHANGE:
3248                 slave = bond_get_slave_by_dev(bond, slave_dev);
3249                 if (slave) {
3250                         u32 old_speed = slave->speed;
3251                         u8  old_duplex = slave->duplex;
3252
3253                         bond_update_speed_duplex(slave);
3254
3255                         if (bond->params.mode == BOND_MODE_8023AD) {
3256                                 if (old_speed != slave->speed)
3257                                         bond_3ad_adapter_speed_changed(slave);
3258                                 if (old_duplex != slave->duplex)
3259                                         bond_3ad_adapter_duplex_changed(slave);
3260                         }
3261                 }
3262
3263                 break;
3264         case NETDEV_DOWN:
3265                 /*
3266                  * ... Or is it this?
3267                  */
3268                 break;
3269         case NETDEV_CHANGEMTU:
3270                 /*
3271                  * TODO: Should slaves be allowed to
3272                  * independently alter their MTU?  For
3273                  * an active-backup bond, slaves need
3274                  * not be the same type of device, so
3275                  * MTUs may vary.  For other modes,
3276                  * slaves arguably should have the
3277                  * same MTUs. To do this, we'd need to
3278                  * take over the slave's change_mtu
3279                  * function for the duration of their
3280                  * servitude.
3281                  */
3282                 break;
3283         case NETDEV_CHANGENAME:
3284                 /*
3285                  * TODO: handle changing the primary's name
3286                  */
3287                 break;
3288         case NETDEV_FEAT_CHANGE:
3289                 bond_compute_features(bond);
3290                 break;
3291         default:
3292                 break;
3293         }
3294
3295         return NOTIFY_DONE;
3296 }
3297
3298 /*
3299  * bond_netdev_event: handle netdev notifier chain events.
3300  *
3301  * This function receives events for the netdev chain.  The caller (an
3302  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3303  * locks for us to safely manipulate the slave devices (RTNL lock,
3304  * dev_probe_lock).
3305  */
3306 static int bond_netdev_event(struct notifier_block *this,
3307                              unsigned long event, void *ptr)
3308 {
3309         struct net_device *event_dev = (struct net_device *)ptr;
3310
3311         pr_debug("event_dev: %s, event: %lx\n",
3312                  event_dev ? event_dev->name : "None",
3313                  event);
3314
3315         if (!(event_dev->priv_flags & IFF_BONDING))
3316                 return NOTIFY_DONE;
3317
3318         if (event_dev->flags & IFF_MASTER) {
3319                 pr_debug("IFF_MASTER\n");
3320                 return bond_master_netdev_event(event, event_dev);
3321         }
3322
3323         if (event_dev->flags & IFF_SLAVE) {
3324                 pr_debug("IFF_SLAVE\n");
3325                 return bond_slave_netdev_event(event, event_dev);
3326         }
3327
3328         return NOTIFY_DONE;
3329 }
3330
3331 static struct notifier_block bond_netdev_notifier = {
3332         .notifier_call = bond_netdev_event,
3333 };
3334
3335 /*---------------------------- Hashing Policies -----------------------------*/
3336
3337 /*
3338  * Hash for the output device based upon layer 2 and layer 3 data. If
3339  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3340  */
3341 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3342 {
3343         struct ethhdr *data = (struct ethhdr *)skb->data;
3344         struct iphdr *iph = ip_hdr(skb);
3345
3346         if (skb->protocol == htons(ETH_P_IP)) {
3347                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3348                         (data->h_dest[5] ^ data->h_source[5])) % count;
3349         }
3350
3351         return (data->h_dest[5] ^ data->h_source[5]) % count;
3352 }
3353
3354 /*
3355  * Hash for the output device based upon layer 3 and layer 4 data. If
3356  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3357  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3358  */
3359 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3360 {
3361         struct ethhdr *data = (struct ethhdr *)skb->data;
3362         struct iphdr *iph = ip_hdr(skb);
3363         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3364         int layer4_xor = 0;
3365
3366         if (skb->protocol == htons(ETH_P_IP)) {
3367                 if (!ip_is_fragment(iph) &&
3368                     (iph->protocol == IPPROTO_TCP ||
3369                      iph->protocol == IPPROTO_UDP)) {
3370                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3371                 }
3372                 return (layer4_xor ^
3373                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3374
3375         }
3376
3377         return (data->h_dest[5] ^ data->h_source[5]) % count;
3378 }
3379
3380 /*
3381  * Hash for the output device based upon layer 2 data
3382  */
3383 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3384 {
3385         struct ethhdr *data = (struct ethhdr *)skb->data;
3386
3387         return (data->h_dest[5] ^ data->h_source[5]) % count;
3388 }
3389
3390 /*-------------------------- Device entry points ----------------------------*/
3391
3392 static int bond_open(struct net_device *bond_dev)
3393 {
3394         struct bonding *bond = netdev_priv(bond_dev);
3395         struct slave *slave;
3396         int i;
3397
3398         /* reset slave->backup and slave->inactive */
3399         read_lock(&bond->lock);
3400         if (bond->slave_cnt > 0) {
3401                 read_lock(&bond->curr_slave_lock);
3402                 bond_for_each_slave(bond, slave, i) {
3403                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3404                                 && (slave != bond->curr_active_slave)) {
3405                                 bond_set_slave_inactive_flags(slave);
3406                         } else {
3407                                 bond_set_slave_active_flags(slave);
3408                         }
3409                 }
3410                 read_unlock(&bond->curr_slave_lock);
3411         }
3412         read_unlock(&bond->lock);
3413
3414         INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3415
3416         if (bond_is_lb(bond)) {
3417                 /* bond_alb_initialize must be called before the timer
3418                  * is started.
3419                  */
3420                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3421                         /* something went wrong - fail the open operation */
3422                         return -ENOMEM;
3423                 }
3424
3425                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3426                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3427         }
3428
3429         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3430                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3431                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3432         }
3433
3434         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3435                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3436                         INIT_DELAYED_WORK(&bond->arp_work,
3437                                           bond_activebackup_arp_mon);
3438                 else
3439                         INIT_DELAYED_WORK(&bond->arp_work,
3440                                           bond_loadbalance_arp_mon);
3441
3442                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3443                 if (bond->params.arp_validate)
3444                         bond->recv_probe = bond_arp_rcv;
3445         }
3446
3447         if (bond->params.mode == BOND_MODE_8023AD) {
3448                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3449                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3450                 /* register to receive LACPDUs */
3451                 bond->recv_probe = bond_3ad_lacpdu_recv;
3452                 bond_3ad_initiate_agg_selection(bond, 1);
3453         }
3454
3455         return 0;
3456 }
3457
3458 static int bond_close(struct net_device *bond_dev)
3459 {
3460         struct bonding *bond = netdev_priv(bond_dev);
3461
3462         write_lock_bh(&bond->lock);
3463
3464         bond->send_peer_notif = 0;
3465
3466         write_unlock_bh(&bond->lock);
3467
3468         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3469                 cancel_delayed_work_sync(&bond->mii_work);
3470         }
3471
3472         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3473                 cancel_delayed_work_sync(&bond->arp_work);
3474         }
3475
3476         switch (bond->params.mode) {
3477         case BOND_MODE_8023AD:
3478                 cancel_delayed_work_sync(&bond->ad_work);
3479                 break;
3480         case BOND_MODE_TLB:
3481         case BOND_MODE_ALB:
3482                 cancel_delayed_work_sync(&bond->alb_work);
3483                 break;
3484         default:
3485                 break;
3486         }
3487
3488         if (delayed_work_pending(&bond->mcast_work))
3489                 cancel_delayed_work_sync(&bond->mcast_work);
3490
3491         if (bond_is_lb(bond)) {
3492                 /* Must be called only after all
3493                  * slaves have been released
3494                  */
3495                 bond_alb_deinitialize(bond);
3496         }
3497         bond->recv_probe = NULL;
3498
3499         return 0;
3500 }
3501
3502 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3503                                                 struct rtnl_link_stats64 *stats)
3504 {
3505         struct bonding *bond = netdev_priv(bond_dev);
3506         struct rtnl_link_stats64 temp;
3507         struct slave *slave;
3508         int i;
3509
3510         memset(stats, 0, sizeof(*stats));
3511
3512         read_lock_bh(&bond->lock);
3513
3514         bond_for_each_slave(bond, slave, i) {
3515                 const struct rtnl_link_stats64 *sstats =
3516                         dev_get_stats(slave->dev, &temp);
3517
3518                 stats->rx_packets += sstats->rx_packets;
3519                 stats->rx_bytes += sstats->rx_bytes;
3520                 stats->rx_errors += sstats->rx_errors;
3521                 stats->rx_dropped += sstats->rx_dropped;
3522
3523                 stats->tx_packets += sstats->tx_packets;
3524                 stats->tx_bytes += sstats->tx_bytes;
3525                 stats->tx_errors += sstats->tx_errors;
3526                 stats->tx_dropped += sstats->tx_dropped;
3527
3528                 stats->multicast += sstats->multicast;
3529                 stats->collisions += sstats->collisions;
3530
3531                 stats->rx_length_errors += sstats->rx_length_errors;
3532                 stats->rx_over_errors += sstats->rx_over_errors;
3533                 stats->rx_crc_errors += sstats->rx_crc_errors;
3534                 stats->rx_frame_errors += sstats->rx_frame_errors;
3535                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3536                 stats->rx_missed_errors += sstats->rx_missed_errors;
3537
3538                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3539                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3540                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3541                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3542                 stats->tx_window_errors += sstats->tx_window_errors;
3543         }
3544
3545         read_unlock_bh(&bond->lock);
3546
3547         return stats;
3548 }
3549
3550 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3551 {
3552         struct net_device *slave_dev = NULL;
3553         struct ifbond k_binfo;
3554         struct ifbond __user *u_binfo = NULL;
3555         struct ifslave k_sinfo;
3556         struct ifslave __user *u_sinfo = NULL;
3557         struct mii_ioctl_data *mii = NULL;
3558         int res = 0;
3559
3560         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3561
3562         switch (cmd) {
3563         case SIOCGMIIPHY:
3564                 mii = if_mii(ifr);
3565                 if (!mii)
3566                         return -EINVAL;
3567
3568                 mii->phy_id = 0;
3569                 /* Fall Through */
3570         case SIOCGMIIREG:
3571                 /*
3572                  * We do this again just in case we were called by SIOCGMIIREG
3573                  * instead of SIOCGMIIPHY.
3574                  */
3575                 mii = if_mii(ifr);
3576                 if (!mii)
3577                         return -EINVAL;
3578
3579
3580                 if (mii->reg_num == 1) {
3581                         struct bonding *bond = netdev_priv(bond_dev);
3582                         mii->val_out = 0;
3583                         read_lock(&bond->lock);
3584                         read_lock(&bond->curr_slave_lock);
3585                         if (netif_carrier_ok(bond->dev))
3586                                 mii->val_out = BMSR_LSTATUS;
3587
3588                         read_unlock(&bond->curr_slave_lock);
3589                         read_unlock(&bond->lock);
3590                 }
3591
3592                 return 0;
3593         case BOND_INFO_QUERY_OLD:
3594         case SIOCBONDINFOQUERY:
3595                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3596
3597                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3598                         return -EFAULT;
3599
3600                 res = bond_info_query(bond_dev, &k_binfo);
3601                 if (res == 0 &&
3602                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3603                         return -EFAULT;
3604
3605                 return res;
3606         case BOND_SLAVE_INFO_QUERY_OLD:
3607         case SIOCBONDSLAVEINFOQUERY:
3608                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3609
3610                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3611                         return -EFAULT;
3612
3613                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3614                 if (res == 0 &&
3615                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3616                         return -EFAULT;
3617
3618                 return res;
3619         default:
3620                 /* Go on */
3621                 break;
3622         }
3623
3624         if (!capable(CAP_NET_ADMIN))
3625                 return -EPERM;
3626
3627         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3628
3629         pr_debug("slave_dev=%p:\n", slave_dev);
3630
3631         if (!slave_dev)
3632                 res = -ENODEV;
3633         else {
3634                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3635                 switch (cmd) {
3636                 case BOND_ENSLAVE_OLD:
3637                 case SIOCBONDENSLAVE:
3638                         res = bond_enslave(bond_dev, slave_dev);
3639                         break;
3640                 case BOND_RELEASE_OLD:
3641                 case SIOCBONDRELEASE:
3642                         res = bond_release(bond_dev, slave_dev);
3643                         break;
3644                 case BOND_SETHWADDR_OLD:
3645                 case SIOCBONDSETHWADDR:
3646                         res = bond_sethwaddr(bond_dev, slave_dev);
3647                         break;
3648                 case BOND_CHANGE_ACTIVE_OLD:
3649                 case SIOCBONDCHANGEACTIVE:
3650                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3651                         break;
3652                 default:
3653                         res = -EOPNOTSUPP;
3654                 }
3655
3656                 dev_put(slave_dev);
3657         }
3658
3659         return res;
3660 }
3661
3662 static bool bond_addr_in_mc_list(unsigned char *addr,
3663                                  struct netdev_hw_addr_list *list,
3664                                  int addrlen)
3665 {
3666         struct netdev_hw_addr *ha;
3667
3668         netdev_hw_addr_list_for_each(ha, list)
3669                 if (!memcmp(ha->addr, addr, addrlen))
3670                         return true;
3671
3672         return false;
3673 }
3674
3675 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3676 {
3677         struct bonding *bond = netdev_priv(bond_dev);
3678
3679         if (change & IFF_PROMISC)
3680                 bond_set_promiscuity(bond,
3681                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3682
3683         if (change & IFF_ALLMULTI)
3684                 bond_set_allmulti(bond,
3685                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3686 }
3687
3688 static void bond_set_multicast_list(struct net_device *bond_dev)
3689 {
3690         struct bonding *bond = netdev_priv(bond_dev);
3691         struct netdev_hw_addr *ha;
3692         bool found;
3693
3694         read_lock(&bond->lock);
3695
3696         /* looking for addresses to add to slaves' mc list */
3697         netdev_for_each_mc_addr(ha, bond_dev) {
3698                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3699                                              bond_dev->addr_len);
3700                 if (!found)
3701                         bond_mc_add(bond, ha->addr);
3702         }
3703
3704         /* looking for addresses to delete from slaves' list */
3705         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3706                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3707                                              bond_dev->addr_len);
3708                 if (!found)
3709                         bond_mc_del(bond, ha->addr);
3710         }
3711
3712         /* save master's multicast list */
3713         __hw_addr_flush(&bond->mc_list);
3714         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3715                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3716
3717         read_unlock(&bond->lock);
3718 }
3719
3720 static int bond_neigh_init(struct neighbour *n)
3721 {
3722         struct bonding *bond = netdev_priv(n->dev);
3723         struct slave *slave = bond->first_slave;
3724         const struct net_device_ops *slave_ops;
3725         struct neigh_parms parms;
3726         int ret;
3727
3728         if (!slave)
3729                 return 0;
3730
3731         slave_ops = slave->dev->netdev_ops;
3732
3733         if (!slave_ops->ndo_neigh_setup)
3734                 return 0;
3735
3736         parms.neigh_setup = NULL;
3737         parms.neigh_cleanup = NULL;
3738         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3739         if (ret)
3740                 return ret;
3741
3742         /*
3743          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3744          * after the last slave has been detached.  Assumes that all slaves
3745          * utilize the same neigh_cleanup (true at this writing as only user
3746          * is ipoib).
3747          */
3748         n->parms->neigh_cleanup = parms.neigh_cleanup;
3749
3750         if (!parms.neigh_setup)
3751                 return 0;
3752
3753         return parms.neigh_setup(n);
3754 }
3755
3756 /*
3757  * The bonding ndo_neigh_setup is called at init time beofre any
3758  * slave exists. So we must declare proxy setup function which will
3759  * be used at run time to resolve the actual slave neigh param setup.
3760  */
3761 static int bond_neigh_setup(struct net_device *dev,
3762                             struct neigh_parms *parms)
3763 {
3764         parms->neigh_setup   = bond_neigh_init;
3765
3766         return 0;
3767 }
3768
3769 /*
3770  * Change the MTU of all of a master's slaves to match the master
3771  */
3772 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3773 {
3774         struct bonding *bond = netdev_priv(bond_dev);
3775         struct slave *slave, *stop_at;
3776         int res = 0;
3777         int i;
3778
3779         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3780                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3781
3782         /* Can't hold bond->lock with bh disabled here since
3783          * some base drivers panic. On the other hand we can't
3784          * hold bond->lock without bh disabled because we'll
3785          * deadlock. The only solution is to rely on the fact
3786          * that we're under rtnl_lock here, and the slaves
3787          * list won't change. This doesn't solve the problem
3788          * of setting the slave's MTU while it is
3789          * transmitting, but the assumption is that the base
3790          * driver can handle that.
3791          *
3792          * TODO: figure out a way to safely iterate the slaves
3793          * list, but without holding a lock around the actual
3794          * call to the base driver.
3795          */
3796
3797         bond_for_each_slave(bond, slave, i) {
3798                 pr_debug("s %p s->p %p c_m %p\n",
3799                          slave,
3800                          slave->prev,
3801                          slave->dev->netdev_ops->ndo_change_mtu);
3802
3803                 res = dev_set_mtu(slave->dev, new_mtu);
3804
3805                 if (res) {
3806                         /* If we failed to set the slave's mtu to the new value
3807                          * we must abort the operation even in ACTIVE_BACKUP
3808                          * mode, because if we allow the backup slaves to have
3809                          * different mtu values than the active slave we'll
3810                          * need to change their mtu when doing a failover. That
3811                          * means changing their mtu from timer context, which
3812                          * is probably not a good idea.
3813                          */
3814                         pr_debug("err %d %s\n", res, slave->dev->name);
3815                         goto unwind;
3816                 }
3817         }
3818
3819         bond_dev->mtu = new_mtu;
3820
3821         return 0;
3822
3823 unwind:
3824         /* unwind from head to the slave that failed */
3825         stop_at = slave;
3826         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3827                 int tmp_res;
3828
3829                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3830                 if (tmp_res) {
3831                         pr_debug("unwind err %d dev %s\n",
3832                                  tmp_res, slave->dev->name);
3833                 }
3834         }
3835
3836         return res;
3837 }
3838
3839 /*
3840  * Change HW address
3841  *
3842  * Note that many devices must be down to change the HW address, and
3843  * downing the master releases all slaves.  We can make bonds full of
3844  * bonding devices to test this, however.
3845  */
3846 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3847 {
3848         struct bonding *bond = netdev_priv(bond_dev);
3849         struct sockaddr *sa = addr, tmp_sa;
3850         struct slave *slave, *stop_at;
3851         int res = 0;
3852         int i;
3853
3854         if (bond->params.mode == BOND_MODE_ALB)
3855                 return bond_alb_set_mac_address(bond_dev, addr);
3856
3857
3858         pr_debug("bond=%p, name=%s\n",
3859                  bond, bond_dev ? bond_dev->name : "None");
3860
3861         /*
3862          * If fail_over_mac is set to active, do nothing and return
3863          * success.  Returning an error causes ifenslave to fail.
3864          */
3865         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3866                 return 0;
3867
3868         if (!is_valid_ether_addr(sa->sa_data))
3869                 return -EADDRNOTAVAIL;
3870
3871         /* Can't hold bond->lock with bh disabled here since
3872          * some base drivers panic. On the other hand we can't
3873          * hold bond->lock without bh disabled because we'll
3874          * deadlock. The only solution is to rely on the fact
3875          * that we're under rtnl_lock here, and the slaves
3876          * list won't change. This doesn't solve the problem
3877          * of setting the slave's hw address while it is
3878          * transmitting, but the assumption is that the base
3879          * driver can handle that.
3880          *
3881          * TODO: figure out a way to safely iterate the slaves
3882          * list, but without holding a lock around the actual
3883          * call to the base driver.
3884          */
3885
3886         bond_for_each_slave(bond, slave, i) {
3887                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3888                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3889
3890                 if (slave_ops->ndo_set_mac_address == NULL) {
3891                         res = -EOPNOTSUPP;
3892                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3893                         goto unwind;
3894                 }
3895
3896                 res = dev_set_mac_address(slave->dev, addr);
3897                 if (res) {
3898                         /* TODO: consider downing the slave
3899                          * and retry ?
3900                          * User should expect communications
3901                          * breakage anyway until ARP finish
3902                          * updating, so...
3903                          */
3904                         pr_debug("err %d %s\n", res, slave->dev->name);
3905                         goto unwind;
3906                 }
3907         }
3908
3909         /* success */
3910         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3911         return 0;
3912
3913 unwind:
3914         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3915         tmp_sa.sa_family = bond_dev->type;
3916
3917         /* unwind from head to the slave that failed */
3918         stop_at = slave;
3919         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3920                 int tmp_res;
3921
3922                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3923                 if (tmp_res) {
3924                         pr_debug("unwind err %d dev %s\n",
3925                                  tmp_res, slave->dev->name);
3926                 }
3927         }
3928
3929         return res;
3930 }
3931
3932 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3933 {
3934         struct bonding *bond = netdev_priv(bond_dev);
3935         struct slave *slave, *start_at;
3936         int i, slave_no, res = 1;
3937         struct iphdr *iph = ip_hdr(skb);
3938
3939         /*
3940          * Start with the curr_active_slave that joined the bond as the
3941          * default for sending IGMP traffic.  For failover purposes one
3942          * needs to maintain some consistency for the interface that will
3943          * send the join/membership reports.  The curr_active_slave found
3944          * will send all of this type of traffic.
3945          */
3946         if ((iph->protocol == IPPROTO_IGMP) &&
3947             (skb->protocol == htons(ETH_P_IP))) {
3948
3949                 read_lock(&bond->curr_slave_lock);
3950                 slave = bond->curr_active_slave;
3951                 read_unlock(&bond->curr_slave_lock);
3952
3953                 if (!slave)
3954                         goto out;
3955         } else {
3956                 /*
3957                  * Concurrent TX may collide on rr_tx_counter; we accept
3958                  * that as being rare enough not to justify using an
3959                  * atomic op here.
3960                  */
3961                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3962
3963                 bond_for_each_slave(bond, slave, i) {
3964                         slave_no--;
3965                         if (slave_no < 0)
3966                                 break;
3967                 }
3968         }
3969
3970         start_at = slave;
3971         bond_for_each_slave_from(bond, slave, i, start_at) {
3972                 if (IS_UP(slave->dev) &&
3973                     (slave->link == BOND_LINK_UP) &&
3974                     bond_is_active_slave(slave)) {
3975                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3976                         break;
3977                 }
3978         }
3979
3980 out:
3981         if (res) {
3982                 /* no suitable interface, frame not sent */
3983                 dev_kfree_skb(skb);
3984         }
3985
3986         return NETDEV_TX_OK;
3987 }
3988
3989
3990 /*
3991  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3992  * the bond has a usable interface.
3993  */
3994 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3995 {
3996         struct bonding *bond = netdev_priv(bond_dev);
3997         int res = 1;
3998
3999         read_lock(&bond->curr_slave_lock);
4000
4001         if (bond->curr_active_slave)
4002                 res = bond_dev_queue_xmit(bond, skb,
4003                         bond->curr_active_slave->dev);
4004
4005         if (res)
4006                 /* no suitable interface, frame not sent */
4007                 dev_kfree_skb(skb);
4008
4009         read_unlock(&bond->curr_slave_lock);
4010
4011         return NETDEV_TX_OK;
4012 }
4013
4014 /*
4015  * In bond_xmit_xor() , we determine the output device by using a pre-
4016  * determined xmit_hash_policy(), If the selected device is not enabled,
4017  * find the next active slave.
4018  */
4019 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4020 {
4021         struct bonding *bond = netdev_priv(bond_dev);
4022         struct slave *slave, *start_at;
4023         int slave_no;
4024         int i;
4025         int res = 1;
4026
4027         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4028
4029         bond_for_each_slave(bond, slave, i) {
4030                 slave_no--;
4031                 if (slave_no < 0)
4032                         break;
4033         }
4034
4035         start_at = slave;
4036
4037         bond_for_each_slave_from(bond, slave, i, start_at) {
4038                 if (IS_UP(slave->dev) &&
4039                     (slave->link == BOND_LINK_UP) &&
4040                     bond_is_active_slave(slave)) {
4041                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4042                         break;
4043                 }
4044         }
4045
4046         if (res) {
4047                 /* no suitable interface, frame not sent */
4048                 dev_kfree_skb(skb);
4049         }
4050
4051         return NETDEV_TX_OK;
4052 }
4053
4054 /*
4055  * in broadcast mode, we send everything to all usable interfaces.
4056  */
4057 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4058 {
4059         struct bonding *bond = netdev_priv(bond_dev);
4060         struct slave *slave, *start_at;
4061         struct net_device *tx_dev = NULL;
4062         int i;
4063         int res = 1;
4064
4065         read_lock(&bond->curr_slave_lock);
4066         start_at = bond->curr_active_slave;
4067         read_unlock(&bond->curr_slave_lock);
4068
4069         if (!start_at)
4070                 goto out;
4071
4072         bond_for_each_slave_from(bond, slave, i, start_at) {
4073                 if (IS_UP(slave->dev) &&
4074                     (slave->link == BOND_LINK_UP) &&
4075                     bond_is_active_slave(slave)) {
4076                         if (tx_dev) {
4077                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4078                                 if (!skb2) {
4079                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4080                                                bond_dev->name);
4081                                         continue;
4082                                 }
4083
4084                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4085                                 if (res) {
4086                                         dev_kfree_skb(skb2);
4087                                         continue;
4088                                 }
4089                         }
4090                         tx_dev = slave->dev;
4091                 }
4092         }
4093
4094         if (tx_dev)
4095                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4096
4097 out:
4098         if (res)
4099                 /* no suitable interface, frame not sent */
4100                 dev_kfree_skb(skb);
4101
4102         /* frame sent to all suitable interfaces */
4103         return NETDEV_TX_OK;
4104 }
4105
4106 /*------------------------- Device initialization ---------------------------*/
4107
4108 static void bond_set_xmit_hash_policy(struct bonding *bond)
4109 {
4110         switch (bond->params.xmit_policy) {
4111         case BOND_XMIT_POLICY_LAYER23:
4112                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4113                 break;
4114         case BOND_XMIT_POLICY_LAYER34:
4115                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4116                 break;
4117         case BOND_XMIT_POLICY_LAYER2:
4118         default:
4119                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4120                 break;
4121         }
4122 }
4123
4124 /*
4125  * Lookup the slave that corresponds to a qid
4126  */
4127 static inline int bond_slave_override(struct bonding *bond,
4128                                       struct sk_buff *skb)
4129 {
4130         int i, res = 1;
4131         struct slave *slave = NULL;
4132         struct slave *check_slave;
4133
4134         if (!skb->queue_mapping)
4135                 return 1;
4136
4137         /* Find out if any slaves have the same mapping as this skb. */
4138         bond_for_each_slave(bond, check_slave, i) {
4139                 if (check_slave->queue_id == skb->queue_mapping) {
4140                         slave = check_slave;
4141                         break;
4142                 }
4143         }
4144
4145         /* If the slave isn't UP, use default transmit policy. */
4146         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4147             (slave->link == BOND_LINK_UP)) {
4148                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4149         }
4150
4151         return res;
4152 }
4153
4154
4155 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4156 {
4157         /*
4158          * This helper function exists to help dev_pick_tx get the correct
4159          * destination queue.  Using a helper function skips a call to
4160          * skb_tx_hash and will put the skbs in the queue we expect on their
4161          * way down to the bonding driver.
4162          */
4163         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4164
4165         /*
4166          * Save the original txq to restore before passing to the driver
4167          */
4168         bond_queue_mapping(skb) = skb->queue_mapping;
4169
4170         if (unlikely(txq >= dev->real_num_tx_queues)) {
4171                 do {
4172                         txq -= dev->real_num_tx_queues;
4173                 } while (txq >= dev->real_num_tx_queues);
4174         }
4175         return txq;
4176 }
4177
4178 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4179 {
4180         struct bonding *bond = netdev_priv(dev);
4181
4182         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4183                 if (!bond_slave_override(bond, skb))
4184                         return NETDEV_TX_OK;
4185         }
4186
4187         switch (bond->params.mode) {
4188         case BOND_MODE_ROUNDROBIN:
4189                 return bond_xmit_roundrobin(skb, dev);
4190         case BOND_MODE_ACTIVEBACKUP:
4191                 return bond_xmit_activebackup(skb, dev);
4192         case BOND_MODE_XOR:
4193                 return bond_xmit_xor(skb, dev);
4194         case BOND_MODE_BROADCAST:
4195                 return bond_xmit_broadcast(skb, dev);
4196         case BOND_MODE_8023AD:
4197                 return bond_3ad_xmit_xor(skb, dev);
4198         case BOND_MODE_ALB:
4199         case BOND_MODE_TLB:
4200                 return bond_alb_xmit(skb, dev);
4201         default:
4202                 /* Should never happen, mode already checked */
4203                 pr_err("%s: Error: Unknown bonding mode %d\n",
4204                        dev->name, bond->params.mode);
4205                 WARN_ON_ONCE(1);
4206                 dev_kfree_skb(skb);
4207                 return NETDEV_TX_OK;
4208         }
4209 }
4210
4211 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4212 {
4213         struct bonding *bond = netdev_priv(dev);
4214         netdev_tx_t ret = NETDEV_TX_OK;
4215
4216         /*
4217          * If we risk deadlock from transmitting this in the
4218          * netpoll path, tell netpoll to queue the frame for later tx
4219          */
4220         if (is_netpoll_tx_blocked(dev))
4221                 return NETDEV_TX_BUSY;
4222
4223         read_lock(&bond->lock);
4224
4225         if (bond->slave_cnt)
4226                 ret = __bond_start_xmit(skb, dev);
4227         else
4228                 dev_kfree_skb(skb);
4229
4230         read_unlock(&bond->lock);
4231
4232         return ret;
4233 }
4234
4235 /*
4236  * set bond mode specific net device operations
4237  */
4238 void bond_set_mode_ops(struct bonding *bond, int mode)
4239 {
4240         struct net_device *bond_dev = bond->dev;
4241
4242         switch (mode) {
4243         case BOND_MODE_ROUNDROBIN:
4244                 break;
4245         case BOND_MODE_ACTIVEBACKUP:
4246                 break;
4247         case BOND_MODE_XOR:
4248                 bond_set_xmit_hash_policy(bond);
4249                 break;
4250         case BOND_MODE_BROADCAST:
4251                 break;
4252         case BOND_MODE_8023AD:
4253                 bond_set_xmit_hash_policy(bond);
4254                 break;
4255         case BOND_MODE_ALB:
4256                 /* FALLTHRU */
4257         case BOND_MODE_TLB:
4258                 break;
4259         default:
4260                 /* Should never happen, mode already checked */
4261                 pr_err("%s: Error: Unknown bonding mode %d\n",
4262                        bond_dev->name, mode);
4263                 break;
4264         }
4265 }
4266
4267 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4268                                     struct ethtool_drvinfo *drvinfo)
4269 {
4270         strncpy(drvinfo->driver, DRV_NAME, 32);
4271         strncpy(drvinfo->version, DRV_VERSION, 32);
4272         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4273 }
4274
4275 static const struct ethtool_ops bond_ethtool_ops = {
4276         .get_drvinfo            = bond_ethtool_get_drvinfo,
4277         .get_link               = ethtool_op_get_link,
4278 };
4279
4280 static const struct net_device_ops bond_netdev_ops = {
4281         .ndo_init               = bond_init,
4282         .ndo_uninit             = bond_uninit,
4283         .ndo_open               = bond_open,
4284         .ndo_stop               = bond_close,
4285         .ndo_start_xmit         = bond_start_xmit,
4286         .ndo_select_queue       = bond_select_queue,
4287         .ndo_get_stats64        = bond_get_stats,
4288         .ndo_do_ioctl           = bond_do_ioctl,
4289         .ndo_change_rx_flags    = bond_change_rx_flags,
4290         .ndo_set_rx_mode        = bond_set_multicast_list,
4291         .ndo_change_mtu         = bond_change_mtu,
4292         .ndo_set_mac_address    = bond_set_mac_address,
4293         .ndo_neigh_setup        = bond_neigh_setup,
4294         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4295         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4296 #ifdef CONFIG_NET_POLL_CONTROLLER
4297         .ndo_netpoll_setup      = bond_netpoll_setup,
4298         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4299         .ndo_poll_controller    = bond_poll_controller,
4300 #endif
4301         .ndo_add_slave          = bond_enslave,
4302         .ndo_del_slave          = bond_release,
4303         .ndo_fix_features       = bond_fix_features,
4304 };
4305
4306 static void bond_destructor(struct net_device *bond_dev)
4307 {
4308         struct bonding *bond = netdev_priv(bond_dev);
4309         if (bond->wq)
4310                 destroy_workqueue(bond->wq);
4311         free_netdev(bond_dev);
4312 }
4313
4314 static void bond_setup(struct net_device *bond_dev)
4315 {
4316         struct bonding *bond = netdev_priv(bond_dev);
4317
4318         /* initialize rwlocks */
4319         rwlock_init(&bond->lock);
4320         rwlock_init(&bond->curr_slave_lock);
4321
4322         bond->params = bonding_defaults;
4323
4324         /* Initialize pointers */
4325         bond->dev = bond_dev;
4326         INIT_LIST_HEAD(&bond->vlan_list);
4327
4328         /* Initialize the device entry points */
4329         ether_setup(bond_dev);
4330         bond_dev->netdev_ops = &bond_netdev_ops;
4331         bond_dev->ethtool_ops = &bond_ethtool_ops;
4332         bond_set_mode_ops(bond, bond->params.mode);
4333
4334         bond_dev->destructor = bond_destructor;
4335
4336         /* Initialize the device options */
4337         bond_dev->tx_queue_len = 0;
4338         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4339         bond_dev->priv_flags |= IFF_BONDING;
4340         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4341
4342         /* At first, we block adding VLANs. That's the only way to
4343          * prevent problems that occur when adding VLANs over an
4344          * empty bond. The block will be removed once non-challenged
4345          * slaves are enslaved.
4346          */
4347         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4348
4349         /* don't acquire bond device's netif_tx_lock when
4350          * transmitting */
4351         bond_dev->features |= NETIF_F_LLTX;
4352
4353         /* By default, we declare the bond to be fully
4354          * VLAN hardware accelerated capable. Special
4355          * care is taken in the various xmit functions
4356          * when there are slaves that are not hw accel
4357          * capable
4358          */
4359
4360         bond_dev->hw_features = BOND_VLAN_FEATURES |
4361                                 NETIF_F_HW_VLAN_TX |
4362                                 NETIF_F_HW_VLAN_RX |
4363                                 NETIF_F_HW_VLAN_FILTER;
4364
4365         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4366         bond_dev->features |= bond_dev->hw_features;
4367 }
4368
4369 static void bond_work_cancel_all(struct bonding *bond)
4370 {
4371         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4372                 cancel_delayed_work_sync(&bond->mii_work);
4373
4374         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4375                 cancel_delayed_work_sync(&bond->arp_work);
4376
4377         if (bond->params.mode == BOND_MODE_ALB &&
4378             delayed_work_pending(&bond->alb_work))
4379                 cancel_delayed_work_sync(&bond->alb_work);
4380
4381         if (bond->params.mode == BOND_MODE_8023AD &&
4382             delayed_work_pending(&bond->ad_work))
4383                 cancel_delayed_work_sync(&bond->ad_work);
4384
4385         if (delayed_work_pending(&bond->mcast_work))
4386                 cancel_delayed_work_sync(&bond->mcast_work);
4387 }
4388
4389 /*
4390 * Destroy a bonding device.
4391 * Must be under rtnl_lock when this function is called.
4392 */
4393 static void bond_uninit(struct net_device *bond_dev)
4394 {
4395         struct bonding *bond = netdev_priv(bond_dev);
4396         struct vlan_entry *vlan, *tmp;
4397
4398         bond_netpoll_cleanup(bond_dev);
4399
4400         /* Release the bonded slaves */
4401         bond_release_all(bond_dev);
4402
4403         list_del(&bond->bond_list);
4404
4405         bond_work_cancel_all(bond);
4406
4407         bond_remove_proc_entry(bond);
4408
4409         bond_debug_unregister(bond);
4410
4411         __hw_addr_flush(&bond->mc_list);
4412
4413         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4414                 list_del(&vlan->vlan_list);
4415                 kfree(vlan);
4416         }
4417 }
4418
4419 /*------------------------- Module initialization ---------------------------*/
4420
4421 /*
4422  * Convert string input module parms.  Accept either the
4423  * number of the mode or its string name.  A bit complicated because
4424  * some mode names are substrings of other names, and calls from sysfs
4425  * may have whitespace in the name (trailing newlines, for example).
4426  */
4427 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4428 {
4429         int modeint = -1, i, rv;
4430         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4431
4432         for (p = (char *)buf; *p; p++)
4433                 if (!(isdigit(*p) || isspace(*p)))
4434                         break;
4435
4436         if (*p)
4437                 rv = sscanf(buf, "%20s", modestr);
4438         else
4439                 rv = sscanf(buf, "%d", &modeint);
4440
4441         if (!rv)
4442                 return -1;
4443
4444         for (i = 0; tbl[i].modename; i++) {
4445                 if (modeint == tbl[i].mode)
4446                         return tbl[i].mode;
4447                 if (strcmp(modestr, tbl[i].modename) == 0)
4448                         return tbl[i].mode;
4449         }
4450
4451         return -1;
4452 }
4453
4454 static int bond_check_params(struct bond_params *params)
4455 {
4456         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4457
4458         /*
4459          * Convert string parameters.
4460          */
4461         if (mode) {
4462                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4463                 if (bond_mode == -1) {
4464                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4465                                mode == NULL ? "NULL" : mode);
4466                         return -EINVAL;
4467                 }
4468         }
4469
4470         if (xmit_hash_policy) {
4471                 if ((bond_mode != BOND_MODE_XOR) &&
4472                     (bond_mode != BOND_MODE_8023AD)) {
4473                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4474                                bond_mode_name(bond_mode));
4475                 } else {
4476                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4477                                                         xmit_hashtype_tbl);
4478                         if (xmit_hashtype == -1) {
4479                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4480                                        xmit_hash_policy == NULL ? "NULL" :
4481                                        xmit_hash_policy);
4482                                 return -EINVAL;
4483                         }
4484                 }
4485         }
4486
4487         if (lacp_rate) {
4488                 if (bond_mode != BOND_MODE_8023AD) {
4489                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4490                                 bond_mode_name(bond_mode));
4491                 } else {
4492                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4493                         if (lacp_fast == -1) {
4494                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4495                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4496                                 return -EINVAL;
4497                         }
4498                 }
4499         }
4500
4501         if (ad_select) {
4502                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4503                 if (params->ad_select == -1) {
4504                         pr_err("Error: Invalid ad_select \"%s\"\n",
4505                                ad_select == NULL ? "NULL" : ad_select);
4506                         return -EINVAL;
4507                 }
4508
4509                 if (bond_mode != BOND_MODE_8023AD) {
4510                         pr_warning("ad_select param only affects 802.3ad mode\n");
4511                 }
4512         } else {
4513                 params->ad_select = BOND_AD_STABLE;
4514         }
4515
4516         if (max_bonds < 0) {
4517                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4518                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4519                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4520         }
4521
4522         if (miimon < 0) {
4523                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4524                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4525                 miimon = BOND_LINK_MON_INTERV;
4526         }
4527
4528         if (updelay < 0) {
4529                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4530                            updelay, INT_MAX);
4531                 updelay = 0;
4532         }
4533
4534         if (downdelay < 0) {
4535                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4536                            downdelay, INT_MAX);
4537                 downdelay = 0;
4538         }
4539
4540         if ((use_carrier != 0) && (use_carrier != 1)) {
4541                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4542                            use_carrier);
4543                 use_carrier = 1;
4544         }
4545
4546         if (num_peer_notif < 0 || num_peer_notif > 255) {
4547                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4548                            num_peer_notif);
4549                 num_peer_notif = 1;
4550         }
4551
4552         /* reset values for 802.3ad */
4553         if (bond_mode == BOND_MODE_8023AD) {
4554                 if (!miimon) {
4555                         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");
4556                         pr_warning("Forcing miimon to 100msec\n");
4557                         miimon = 100;
4558                 }
4559         }
4560
4561         if (tx_queues < 1 || tx_queues > 255) {
4562                 pr_warning("Warning: tx_queues (%d) should be between "
4563                            "1 and 255, resetting to %d\n",
4564                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4565                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4566         }
4567
4568         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4569                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4570                            "not of valid value (0/1), so it was set to "
4571                            "0\n", all_slaves_active);
4572                 all_slaves_active = 0;
4573         }
4574
4575         if (resend_igmp < 0 || resend_igmp > 255) {
4576                 pr_warning("Warning: resend_igmp (%d) should be between "
4577                            "0 and 255, resetting to %d\n",
4578                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4579                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4580         }
4581
4582         /* reset values for TLB/ALB */
4583         if ((bond_mode == BOND_MODE_TLB) ||
4584             (bond_mode == BOND_MODE_ALB)) {
4585                 if (!miimon) {
4586                         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");
4587                         pr_warning("Forcing miimon to 100msec\n");
4588                         miimon = 100;
4589                 }
4590         }
4591
4592         if (bond_mode == BOND_MODE_ALB) {
4593                 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",
4594                           updelay);
4595         }
4596
4597         if (!miimon) {
4598                 if (updelay || downdelay) {
4599                         /* just warn the user the up/down delay will have
4600                          * no effect since miimon is zero...
4601                          */
4602                         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",
4603                                    updelay, downdelay);
4604                 }
4605         } else {
4606                 /* don't allow arp monitoring */
4607                 if (arp_interval) {
4608                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4609                                    miimon, arp_interval);
4610                         arp_interval = 0;
4611                 }
4612
4613                 if ((updelay % miimon) != 0) {
4614                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4615                                    updelay, miimon,
4616                                    (updelay / miimon) * miimon);
4617                 }
4618
4619                 updelay /= miimon;
4620
4621                 if ((downdelay % miimon) != 0) {
4622                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4623                                    downdelay, miimon,
4624                                    (downdelay / miimon) * miimon);
4625                 }
4626
4627                 downdelay /= miimon;
4628         }
4629
4630         if (arp_interval < 0) {
4631                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4632                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4633                 arp_interval = BOND_LINK_ARP_INTERV;
4634         }
4635
4636         for (arp_ip_count = 0;
4637              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4638              arp_ip_count++) {
4639                 /* not complete check, but should be good enough to
4640                    catch mistakes */
4641                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4642                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4643                                    arp_ip_target[arp_ip_count]);
4644                         arp_interval = 0;
4645                 } else {
4646                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4647                         arp_target[arp_ip_count] = ip;
4648                 }
4649         }
4650
4651         if (arp_interval && !arp_ip_count) {
4652                 /* don't allow arping if no arp_ip_target given... */
4653                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4654                            arp_interval);
4655                 arp_interval = 0;
4656         }
4657
4658         if (arp_validate) {
4659                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4660                         pr_err("arp_validate only supported in active-backup mode\n");
4661                         return -EINVAL;
4662                 }
4663                 if (!arp_interval) {
4664                         pr_err("arp_validate requires arp_interval\n");
4665                         return -EINVAL;
4666                 }
4667
4668                 arp_validate_value = bond_parse_parm(arp_validate,
4669                                                      arp_validate_tbl);
4670                 if (arp_validate_value == -1) {
4671                         pr_err("Error: invalid arp_validate \"%s\"\n",
4672                                arp_validate == NULL ? "NULL" : arp_validate);
4673                         return -EINVAL;
4674                 }
4675         } else
4676                 arp_validate_value = 0;
4677
4678         if (miimon) {
4679                 pr_info("MII link monitoring set to %d ms\n", miimon);
4680         } else if (arp_interval) {
4681                 int i;
4682
4683                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4684                         arp_interval,
4685                         arp_validate_tbl[arp_validate_value].modename,
4686                         arp_ip_count);
4687
4688                 for (i = 0; i < arp_ip_count; i++)
4689                         pr_info(" %s", arp_ip_target[i]);
4690
4691                 pr_info("\n");
4692
4693         } else if (max_bonds) {
4694                 /* miimon and arp_interval not set, we need one so things
4695                  * work as expected, see bonding.txt for details
4696                  */
4697                 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");
4698         }
4699
4700         if (primary && !USES_PRIMARY(bond_mode)) {
4701                 /* currently, using a primary only makes sense
4702                  * in active backup, TLB or ALB modes
4703                  */
4704                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4705                            primary, bond_mode_name(bond_mode));
4706                 primary = NULL;
4707         }
4708
4709         if (primary && primary_reselect) {
4710                 primary_reselect_value = bond_parse_parm(primary_reselect,
4711                                                          pri_reselect_tbl);
4712                 if (primary_reselect_value == -1) {
4713                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4714                                primary_reselect ==
4715                                         NULL ? "NULL" : primary_reselect);
4716                         return -EINVAL;
4717                 }
4718         } else {
4719                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4720         }
4721
4722         if (fail_over_mac) {
4723                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4724                                                       fail_over_mac_tbl);
4725                 if (fail_over_mac_value == -1) {
4726                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4727                                arp_validate == NULL ? "NULL" : arp_validate);
4728                         return -EINVAL;
4729                 }
4730
4731                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4732                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4733         } else {
4734                 fail_over_mac_value = BOND_FOM_NONE;
4735         }
4736
4737         /* fill params struct with the proper values */
4738         params->mode = bond_mode;
4739         params->xmit_policy = xmit_hashtype;
4740         params->miimon = miimon;
4741         params->num_peer_notif = num_peer_notif;
4742         params->arp_interval = arp_interval;
4743         params->arp_validate = arp_validate_value;
4744         params->updelay = updelay;
4745         params->downdelay = downdelay;
4746         params->use_carrier = use_carrier;
4747         params->lacp_fast = lacp_fast;
4748         params->primary[0] = 0;
4749         params->primary_reselect = primary_reselect_value;
4750         params->fail_over_mac = fail_over_mac_value;
4751         params->tx_queues = tx_queues;
4752         params->all_slaves_active = all_slaves_active;
4753         params->resend_igmp = resend_igmp;
4754         params->min_links = min_links;
4755
4756         if (primary) {
4757                 strncpy(params->primary, primary, IFNAMSIZ);
4758                 params->primary[IFNAMSIZ - 1] = 0;
4759         }
4760
4761         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4762
4763         return 0;
4764 }
4765
4766 static struct lock_class_key bonding_netdev_xmit_lock_key;
4767 static struct lock_class_key bonding_netdev_addr_lock_key;
4768
4769 static void bond_set_lockdep_class_one(struct net_device *dev,
4770                                        struct netdev_queue *txq,
4771                                        void *_unused)
4772 {
4773         lockdep_set_class(&txq->_xmit_lock,
4774                           &bonding_netdev_xmit_lock_key);
4775 }
4776
4777 static void bond_set_lockdep_class(struct net_device *dev)
4778 {
4779         lockdep_set_class(&dev->addr_list_lock,
4780                           &bonding_netdev_addr_lock_key);
4781         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4782 }
4783
4784 /*
4785  * Called from registration process
4786  */
4787 static int bond_init(struct net_device *bond_dev)
4788 {
4789         struct bonding *bond = netdev_priv(bond_dev);
4790         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4791         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4792
4793         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4794
4795         /*
4796          * Initialize locks that may be required during
4797          * en/deslave operations.  All of the bond_open work
4798          * (of which this is part) should really be moved to
4799          * a phase prior to dev_open
4800          */
4801         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4802         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4803
4804         bond->wq = create_singlethread_workqueue(bond_dev->name);
4805         if (!bond->wq)
4806                 return -ENOMEM;
4807
4808         bond_set_lockdep_class(bond_dev);
4809
4810         bond_create_proc_entry(bond);
4811         list_add_tail(&bond->bond_list, &bn->dev_list);
4812
4813         bond_prepare_sysfs_group(bond);
4814
4815         bond_debug_register(bond);
4816
4817         __hw_addr_init(&bond->mc_list);
4818         return 0;
4819 }
4820
4821 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4822 {
4823         if (tb[IFLA_ADDRESS]) {
4824                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4825                         return -EINVAL;
4826                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4827                         return -EADDRNOTAVAIL;
4828         }
4829         return 0;
4830 }
4831
4832 static int bond_get_tx_queues(struct net *net, struct nlattr *tb[])
4833 {
4834         return tx_queues;
4835 }
4836
4837 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4838         .kind           = "bond",
4839         .priv_size      = sizeof(struct bonding),
4840         .setup          = bond_setup,
4841         .validate       = bond_validate,
4842         .get_tx_queues  = bond_get_tx_queues,
4843 };
4844
4845 /* Create a new bond based on the specified name and bonding parameters.
4846  * If name is NULL, obtain a suitable "bond%d" name for us.
4847  * Caller must NOT hold rtnl_lock; we need to release it here before we
4848  * set up our sysfs entries.
4849  */
4850 int bond_create(struct net *net, const char *name)
4851 {
4852         struct net_device *bond_dev;
4853         int res;
4854
4855         rtnl_lock();
4856
4857         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4858                                    name ? name : "bond%d",
4859                                    bond_setup, tx_queues);
4860         if (!bond_dev) {
4861                 pr_err("%s: eek! can't alloc netdev!\n", name);
4862                 rtnl_unlock();
4863                 return -ENOMEM;
4864         }
4865
4866         dev_net_set(bond_dev, net);
4867         bond_dev->rtnl_link_ops = &bond_link_ops;
4868
4869         res = register_netdevice(bond_dev);
4870
4871         netif_carrier_off(bond_dev);
4872
4873         rtnl_unlock();
4874         if (res < 0)
4875                 bond_destructor(bond_dev);
4876         return res;
4877 }
4878
4879 static int __net_init bond_net_init(struct net *net)
4880 {
4881         struct bond_net *bn = net_generic(net, bond_net_id);
4882
4883         bn->net = net;
4884         INIT_LIST_HEAD(&bn->dev_list);
4885
4886         bond_create_proc_dir(bn);
4887         bond_create_sysfs(bn);
4888
4889         return 0;
4890 }
4891
4892 static void __net_exit bond_net_exit(struct net *net)
4893 {
4894         struct bond_net *bn = net_generic(net, bond_net_id);
4895
4896         bond_destroy_sysfs(bn);
4897         bond_destroy_proc_dir(bn);
4898 }
4899
4900 static struct pernet_operations bond_net_ops = {
4901         .init = bond_net_init,
4902         .exit = bond_net_exit,
4903         .id   = &bond_net_id,
4904         .size = sizeof(struct bond_net),
4905 };
4906
4907 static int __init bonding_init(void)
4908 {
4909         int i;
4910         int res;
4911
4912         pr_info("%s", bond_version);
4913
4914         res = bond_check_params(&bonding_defaults);
4915         if (res)
4916                 goto out;
4917
4918         res = register_pernet_subsys(&bond_net_ops);
4919         if (res)
4920                 goto out;
4921
4922         res = rtnl_link_register(&bond_link_ops);
4923         if (res)
4924                 goto err_link;
4925
4926         bond_create_debugfs();
4927
4928         for (i = 0; i < max_bonds; i++) {
4929                 res = bond_create(&init_net, NULL);
4930                 if (res)
4931                         goto err;
4932         }
4933
4934         register_netdevice_notifier(&bond_netdev_notifier);
4935 out:
4936         return res;
4937 err:
4938         rtnl_link_unregister(&bond_link_ops);
4939 err_link:
4940         unregister_pernet_subsys(&bond_net_ops);
4941         goto out;
4942
4943 }
4944
4945 static void __exit bonding_exit(void)
4946 {
4947         unregister_netdevice_notifier(&bond_netdev_notifier);
4948
4949         bond_destroy_debugfs();
4950
4951         rtnl_link_unregister(&bond_link_ops);
4952         unregister_pernet_subsys(&bond_net_ops);
4953
4954 #ifdef CONFIG_NET_POLL_CONTROLLER
4955         /*
4956          * Make sure we don't have an imbalance on our netpoll blocking
4957          */
4958         WARN_ON(atomic_read(&netpoll_block_tx));
4959 #endif
4960 }
4961
4962 module_init(bonding_init);
4963 module_exit(bonding_exit);
4964 MODULE_LICENSE("GPL");
4965 MODULE_VERSION(DRV_VERSION);
4966 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4967 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4968 MODULE_ALIAS_RTNL_LINK("bond");