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 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/fcntl.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/ioport.h>
  41 #include <linux/in.h>
  42 #include <net/ip.h>
  43 #include <linux/ip.h>
  44 #include <linux/tcp.h>
  45 #include <linux/udp.h>
  46 #include <linux/slab.h>
  47 #include <linux/string.h>
  48 #include <linux/init.h>
  49 #include <linux/timer.h>
  50 #include <linux/socket.h>
  51 #include <linux/ctype.h>
  52 #include <linux/inet.h>
  53 #include <linux/bitops.h>
  54 #include <asm/system.h>
  55 #include <asm/io.h>
  56 #include <asm/dma.h>
  57 #include <asm/uaccess.h>
  58 #include <linux/errno.h>
  59 #include <linux/netdevice.h>
  60 #include <linux/inetdevice.h>
  61 #include <linux/igmp.h>
  62 #include <linux/etherdevice.h>
  63 #include <linux/skbuff.h>
  64 #include <net/sock.h>
  65 #include <linux/rtnetlink.h>
  66 #include <linux/proc_fs.h>
  67 #include <linux/seq_file.h>
  68 #include <linux/smp.h>
  69 #include <linux/if_ether.h>
  70 #include <net/arp.h>
  71 #include <linux/mii.h>
  72 #include <linux/ethtool.h>
  73 #include <linux/if_vlan.h>
  74 #include <linux/if_bonding.h>
  75 #include <linux/jiffies.h>
  76 #include <net/route.h>
  77 #include <net/net_namespace.h>
  78 #include "bonding.h"
  79 #include "bond_3ad.h"
  80 #include "bond_alb.h"
  81
  82 /*---------------------------- Module parameters ----------------------------*/
  83
  84 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  85 #define BOND_LINK_MON_INTERV    0
  86 #define BOND_LINK_ARP_INTERV    0
  87
  88 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  89 static int num_grat_arp = 1;
  90 static int num_unsol_na = 1;
  91 static int miimon       = BOND_LINK_MON_INTERV;
  92 static int updelay      = 0;
  93 static int downdelay    = 0;
  94 static int use_carrier  = 1;
  95 static char *mode       = NULL;
  96 static char *primary    = NULL;
  97 static char *lacp_rate  = NULL;
  98 static char *ad_select  = NULL;
  99 static char *xmit_hash_policy = NULL;
 100 static int arp_interval = BOND_LINK_ARP_INTERV;
 101 static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
 102 static char *arp_validate = NULL;
 103 static char *fail_over_mac = NULL;
 104 struct bond_params bonding_defaults;
 105
 106 module_param(max_bonds, int, 0);
 107 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 108 module_param(num_grat_arp, int, 0644);
 109 MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
 110 module_param(num_unsol_na, int, 0644);
 111 MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
 112 module_param(miimon, int, 0);
 113 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 114 module_param(updelay, int, 0);
 115 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 116 module_param(downdelay, int, 0);
 117 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 118                             "in milliseconds");
 119 module_param(use_carrier, int, 0);
 120 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 121                               "0 for off, 1 for on (default)");
 122 module_param(mode, charp, 0);
 123 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 124                        "1 for active-backup, 2 for balance-xor, "
 125                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 126                        "6 for balance-alb");
 127 module_param(primary, charp, 0);
 128 MODULE_PARM_DESC(primary, "Primary network device to use");
 129 module_param(lacp_rate, charp, 0);
 130 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 131                             "(slow/fast)");
 132 module_param(ad_select, charp, 0);
 133 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
 134 module_param(xmit_hash_policy, charp, 0);
 135 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 136                                    ", 1 for layer 3+4");
 137 module_param(arp_interval, int, 0);
 138 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 139 module_param_array(arp_ip_target, charp, NULL, 0);
 140 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 141 module_param(arp_validate, charp, 0);
 142 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 143 module_param(fail_over_mac, charp, 0);
 144 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
 145
 146 /*----------------------------- Global variables ----------------------------*/
 147
 148 static const char * const version =
 149         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 150
 151 LIST_HEAD(bond_dev_list);
 152
 153 #ifdef CONFIG_PROC_FS
 154 static struct proc_dir_entry *bond_proc_dir = NULL;
 155 #endif
 156
 157 static __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
 158 static int arp_ip_count = 0;
 159 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 160 static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
 161 static int lacp_fast    = 0;
 162
 163
 164 const struct bond_parm_tbl bond_lacp_tbl[] = {
 165 {       "slow",         AD_LACP_SLOW},
 166 {       "fast",         AD_LACP_FAST},
 167 {       NULL,           -1},
 168 };
 169
 170 const struct bond_parm_tbl bond_mode_tbl[] = {
 171 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 172 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 173 {       "balance-xor",          BOND_MODE_XOR},
 174 {       "broadcast",            BOND_MODE_BROADCAST},
 175 {       "802.3ad",              BOND_MODE_8023AD},
 176 {       "balance-tlb",          BOND_MODE_TLB},
 177 {       "balance-alb",          BOND_MODE_ALB},
 178 {       NULL,                   -1},
 179 };
 180
 181 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 182 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 183 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 184 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 185 {       NULL,                   -1},
 186 };
 187
 188 const struct bond_parm_tbl arp_validate_tbl[] = {
 189 {       "none",                 BOND_ARP_VALIDATE_NONE},
 190 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 191 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 192 {       "all",                  BOND_ARP_VALIDATE_ALL},
 193 {       NULL,                   -1},
 194 };
 195
 196 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 197 {       "none",                 BOND_FOM_NONE},
 198 {       "active",               BOND_FOM_ACTIVE},
 199 {       "follow",               BOND_FOM_FOLLOW},
 200 {       NULL,                   -1},
 201 };
 202
 203 struct bond_parm_tbl ad_select_tbl[] = {
 204 {       "stable",       BOND_AD_STABLE},
 205 {       "bandwidth",    BOND_AD_BANDWIDTH},
 206 {       "count",        BOND_AD_COUNT},
 207 {       NULL,           -1},
 208 };
 209
 210 /*-------------------------- Forward declarations ---------------------------*/
 211
 212 static void bond_send_gratuitous_arp(struct bonding *bond);
 213 static void bond_deinit(struct net_device *bond_dev);
 214
 215 /*---------------------------- General routines -----------------------------*/
 216
 217 static const char *bond_mode_name(int mode)
 218 {
 219         static const char *names[] = {
 220                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 221                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 222                 [BOND_MODE_XOR] = "load balancing (xor)",
 223                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 224                 [BOND_MODE_8023AD]= "IEEE 802.3ad Dynamic link aggregation",
 225                 [BOND_MODE_TLB] = "transmit load balancing",
 226                 [BOND_MODE_ALB] = "adaptive load balancing",
 227         };
 228
 229         if (mode < 0 || mode > BOND_MODE_ALB)
 230                 return "unknown";
 231
 232         return names[mode];
 233 }
 234
 235 /*---------------------------------- VLAN -----------------------------------*/
 236
 237 /**
 238  * bond_add_vlan - add a new vlan id on bond
 239  * @bond: bond that got the notification
 240  * @vlan_id: the vlan id to add
 241  *
 242  * Returns -ENOMEM if allocation failed.
 243  */
 244 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 245 {
 246         struct vlan_entry *vlan;
 247
 248         pr_debug("bond: %s, vlan id %d\n",
 249                 (bond ? bond->dev->name: "None"), vlan_id);
 250
 251         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 252         if (!vlan) {
 253                 return -ENOMEM;
 254         }
 255
 256         INIT_LIST_HEAD(&vlan->vlan_list);
 257         vlan->vlan_id = vlan_id;
 258
 259         write_lock_bh(&bond->lock);
 260
 261         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 262
 263         write_unlock_bh(&bond->lock);
 264
 265         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 266
 267         return 0;
 268 }
 269
 270 /**
 271  * bond_del_vlan - delete a vlan id from bond
 272  * @bond: bond that got the notification
 273  * @vlan_id: the vlan id to delete
 274  *
 275  * returns -ENODEV if @vlan_id was not found in @bond.
 276  */
 277 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 278 {
 279         struct vlan_entry *vlan;
 280         int res = -ENODEV;
 281
 282         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 283
 284         write_lock_bh(&bond->lock);
 285
 286         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 287                 if (vlan->vlan_id == vlan_id) {
 288                         list_del(&vlan->vlan_list);
 289
 290                         if (bond_is_lb(bond))
 291                                 bond_alb_clear_vlan(bond, vlan_id);
 292
 293                         pr_debug("removed VLAN ID %d from bond %s\n", vlan_id,
 294                                 bond->dev->name);
 295
 296                         kfree(vlan);
 297
 298                         if (list_empty(&bond->vlan_list) &&
 299                             (bond->slave_cnt == 0)) {
 300                                 /* Last VLAN removed and no slaves, so
 301                                  * restore block on adding VLANs. This will
 302                                  * be removed once new slaves that are not
 303                                  * VLAN challenged will be added.
 304                                  */
 305                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 306                         }
 307
 308                         res = 0;
 309                         goto out;
 310                 }
 311         }
 312
 313         pr_debug("couldn't find VLAN ID %d in bond %s\n", vlan_id,
 314                 bond->dev->name);
 315
 316 out:
 317         write_unlock_bh(&bond->lock);
 318         return res;
 319 }
 320
 321 /**
 322  * bond_has_challenged_slaves
 323  * @bond: the bond we're working on
 324  *
 325  * Searches the slave list. Returns 1 if a vlan challenged slave
 326  * was found, 0 otherwise.
 327  *
 328  * Assumes bond->lock is held.
 329  */
 330 static int bond_has_challenged_slaves(struct bonding *bond)
 331 {
 332         struct slave *slave;
 333         int i;
 334
 335         bond_for_each_slave(bond, slave, i) {
 336                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 337                         pr_debug("found VLAN challenged slave - %s\n",
 338                                 slave->dev->name);
 339                         return 1;
 340                 }
 341         }
 342
 343         pr_debug("no VLAN challenged slaves found\n");
 344         return 0;
 345 }
 346
 347 /**
 348  * bond_next_vlan - safely skip to the next item in the vlans list.
 349  * @bond: the bond we're working on
 350  * @curr: item we're advancing from
 351  *
 352  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 353  * or @curr->next otherwise (even if it is @curr itself again).
 354  *
 355  * Caller must hold bond->lock
 356  */
 357 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 358 {
 359         struct vlan_entry *next, *last;
 360
 361         if (list_empty(&bond->vlan_list)) {
 362                 return NULL;
 363         }
 364
 365         if (!curr) {
 366                 next = list_entry(bond->vlan_list.next,
 367                                   struct vlan_entry, vlan_list);
 368         } else {
 369                 last = list_entry(bond->vlan_list.prev,
 370                                   struct vlan_entry, vlan_list);
 371                 if (last == curr) {
 372                         next = list_entry(bond->vlan_list.next,
 373                                           struct vlan_entry, vlan_list);
 374                 } else {
 375                         next = list_entry(curr->vlan_list.next,
 376                                           struct vlan_entry, vlan_list);
 377                 }
 378         }
 379
 380         return next;
 381 }
 382
 383 /**
 384  * bond_dev_queue_xmit - Prepare skb for xmit.
 385  *
 386  * @bond: bond device that got this skb for tx.
 387  * @skb: hw accel VLAN tagged skb to transmit
 388  * @slave_dev: slave that is supposed to xmit this skbuff
 389  *
 390  * When the bond gets an skb to transmit that is
 391  * already hardware accelerated VLAN tagged, and it
 392  * needs to relay this skb to a slave that is not
 393  * hw accel capable, the skb needs to be "unaccelerated",
 394  * i.e. strip the hwaccel tag and re-insert it as part
 395  * of the payload.
 396  */
 397 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
 398 {
 399         unsigned short uninitialized_var(vlan_id);
 400
 401         if (!list_empty(&bond->vlan_list) &&
 402             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 403             vlan_get_tag(skb, &vlan_id) == 0) {
 404                 skb->dev = slave_dev;
 405                 skb = vlan_put_tag(skb, vlan_id);
 406                 if (!skb) {
 407                         /* vlan_put_tag() frees the skb in case of error,
 408                          * so return success here so the calling functions
 409                          * won't attempt to free is again.
 410                          */
 411                         return 0;
 412                 }
 413         } else {
 414                 skb->dev = slave_dev;
 415         }
 416
 417         skb->priority = 1;
 418         dev_queue_xmit(skb);
 419
 420         return 0;
 421 }
 422
 423 /*
 424  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 425  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 426  * lock because:
 427  * a. This operation is performed in IOCTL context,
 428  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 429  * c. Holding a lock with BH disabled while directly calling a base driver
 430  *    entry point is generally a BAD idea.
 431  *
 432  * The design of synchronization/protection for this operation in the 8021q
 433  * module is good for one or more VLAN devices over a single physical device
 434  * and cannot be extended for a teaming solution like bonding, so there is a
 435  * potential race condition here where a net device from the vlan group might
 436  * be referenced (either by a base driver or the 8021q code) while it is being
 437  * removed from the system. However, it turns out we're not making matters
 438  * worse, and if it works for regular VLAN usage it will work here too.
 439 */
 440
 441 /**
 442  * bond_vlan_rx_register - Propagates registration to slaves
 443  * @bond_dev: bonding net device that got called
 444  * @grp: vlan group being registered
 445  */
 446 static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
 447 {
 448         struct bonding *bond = netdev_priv(bond_dev);
 449         struct slave *slave;
 450         int i;
 451
 452         bond->vlgrp = grp;
 453
 454         bond_for_each_slave(bond, slave, i) {
 455                 struct net_device *slave_dev = slave->dev;
 456                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 457
 458                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 459                     slave_ops->ndo_vlan_rx_register) {
 460                         slave_ops->ndo_vlan_rx_register(slave_dev, grp);
 461                 }
 462         }
 463 }
 464
 465 /**
 466  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 467  * @bond_dev: bonding net device that got called
 468  * @vid: vlan id being added
 469  */
 470 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 471 {
 472         struct bonding *bond = netdev_priv(bond_dev);
 473         struct slave *slave;
 474         int i, res;
 475
 476         bond_for_each_slave(bond, slave, i) {
 477                 struct net_device *slave_dev = slave->dev;
 478                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 479
 480                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 481                     slave_ops->ndo_vlan_rx_add_vid) {
 482                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
 483                 }
 484         }
 485
 486         res = bond_add_vlan(bond, vid);
 487         if (res) {
 488                 printk(KERN_ERR DRV_NAME
 489                        ": %s: Error: Failed to add vlan id %d\n",
 490                        bond_dev->name, vid);
 491         }
 492 }
 493
 494 /**
 495  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 496  * @bond_dev: bonding net device that got called
 497  * @vid: vlan id being removed
 498  */
 499 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 500 {
 501         struct bonding *bond = netdev_priv(bond_dev);
 502         struct slave *slave;
 503         struct net_device *vlan_dev;
 504         int i, res;
 505
 506         bond_for_each_slave(bond, slave, i) {
 507                 struct net_device *slave_dev = slave->dev;
 508                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 509
 510                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 511                     slave_ops->ndo_vlan_rx_kill_vid) {
 512                         /* Save and then restore vlan_dev in the grp array,
 513                          * since the slave's driver might clear it.
 514                          */
 515                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
 516                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
 517                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
 518                 }
 519         }
 520
 521         res = bond_del_vlan(bond, vid);
 522         if (res) {
 523                 printk(KERN_ERR DRV_NAME
 524                        ": %s: Error: Failed to remove vlan id %d\n",
 525                        bond_dev->name, vid);
 526         }
 527 }
 528
 529 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 530 {
 531         struct vlan_entry *vlan;
 532         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 533
 534         write_lock_bh(&bond->lock);
 535
 536         if (list_empty(&bond->vlan_list))
 537                 goto out;
 538
 539         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 540             slave_ops->ndo_vlan_rx_register)
 541                 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
 542
 543         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 544             !(slave_ops->ndo_vlan_rx_add_vid))
 545                 goto out;
 546
 547         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
 548                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 549
 550 out:
 551         write_unlock_bh(&bond->lock);
 552 }
 553
 554 static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
 555 {
 556         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 557         struct vlan_entry *vlan;
 558         struct net_device *vlan_dev;
 559
 560         write_lock_bh(&bond->lock);
 561
 562         if (list_empty(&bond->vlan_list))
 563                 goto out;
 564
 565         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 566             !(slave_ops->ndo_vlan_rx_kill_vid))
 567                 goto unreg;
 568
 569         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 570                 /* Save and then restore vlan_dev in the grp array,
 571                  * since the slave's driver might clear it.
 572                  */
 573                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
 574                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 575                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
 576         }
 577
 578 unreg:
 579         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 580             slave_ops->ndo_vlan_rx_register)
 581                 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
 582
 583 out:
 584         write_unlock_bh(&bond->lock);
 585 }
 586
 587 /*------------------------------- Link status -------------------------------*/
 588
 589 /*
 590  * Set the carrier state for the master according to the state of its
 591  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 592  * do special 802.3ad magic.
 593  *
 594  * Returns zero if carrier state does not change, nonzero if it does.
 595  */
 596 static int bond_set_carrier(struct bonding *bond)
 597 {
 598         struct slave *slave;
 599         int i;
 600
 601         if (bond->slave_cnt == 0)
 602                 goto down;
 603
 604         if (bond->params.mode == BOND_MODE_8023AD)
 605                 return bond_3ad_set_carrier(bond);
 606
 607         bond_for_each_slave(bond, slave, i) {
 608                 if (slave->link == BOND_LINK_UP) {
 609                         if (!netif_carrier_ok(bond->dev)) {
 610                                 netif_carrier_on(bond->dev);
 611                                 return 1;
 612                         }
 613                         return 0;
 614                 }
 615         }
 616
 617 down:
 618         if (netif_carrier_ok(bond->dev)) {
 619                 netif_carrier_off(bond->dev);
 620                 return 1;
 621         }
 622         return 0;
 623 }
 624
 625 /*
 626  * Get link speed and duplex from the slave's base driver
 627  * using ethtool. If for some reason the call fails or the
 628  * values are invalid, fake speed and duplex to 100/Full
 629  * and return error.
 630  */
 631 static int bond_update_speed_duplex(struct slave *slave)
 632 {
 633         struct net_device *slave_dev = slave->dev;
 634         struct ethtool_cmd etool;
 635         int res;
 636
 637         /* Fake speed and duplex */
 638         slave->speed = SPEED_100;
 639         slave->duplex = DUPLEX_FULL;
 640
 641         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
 642                 return -1;
 643
 644         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 645         if (res < 0)
 646                 return -1;
 647
 648         switch (etool.speed) {
 649         case SPEED_10:
 650         case SPEED_100:
 651         case SPEED_1000:
 652         case SPEED_10000:
 653                 break;
 654         default:
 655                 return -1;
 656         }
 657
 658         switch (etool.duplex) {
 659         case DUPLEX_FULL:
 660         case DUPLEX_HALF:
 661                 break;
 662         default:
 663                 return -1;
 664         }
 665
 666         slave->speed = etool.speed;
 667         slave->duplex = etool.duplex;
 668
 669         return 0;
 670 }
 671
 672 /*
 673  * if <dev> supports MII link status reporting, check its link status.
 674  *
 675  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 676  * depening upon the setting of the use_carrier parameter.
 677  *
 678  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 679  * can't tell and just pretend it is), or 0, meaning that the link is
 680  * down.
 681  *
 682  * If reporting is non-zero, instead of faking link up, return -1 if
 683  * both ETHTOOL and MII ioctls fail (meaning the device does not
 684  * support them).  If use_carrier is set, return whatever it says.
 685  * It'd be nice if there was a good way to tell if a driver supports
 686  * netif_carrier, but there really isn't.
 687  */
 688 static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
 689 {
 690         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 691         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 692         struct ifreq ifr;
 693         struct mii_ioctl_data *mii;
 694
 695         if (bond->params.use_carrier)
 696                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 697
 698         ioctl = slave_ops->ndo_do_ioctl;
 699         if (ioctl) {
 700                 /* TODO: set pointer to correct ioctl on a per team member */
 701                 /*       bases to make this more efficient. that is, once  */
 702                 /*       we determine the correct ioctl, we will always    */
 703                 /*       call it and not the others for that team          */
 704                 /*       member.                                           */
 705
 706                 /*
 707                  * We cannot assume that SIOCGMIIPHY will also read a
 708                  * register; not all network drivers (e.g., e100)
 709                  * support that.
 710                  */
 711
 712                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 713                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 714                 mii = if_mii(&ifr);
 715                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 716                         mii->reg_num = MII_BMSR;
 717                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
 718                                 return (mii->val_out & BMSR_LSTATUS);
 719                         }
 720                 }
 721         }
 722
 723         /*
 724          * Some drivers cache ETHTOOL_GLINK for a period of time so we only
 725          * attempt to get link status from it if the above MII ioctls fail.
 726          */
 727         if (slave_dev->ethtool_ops) {
 728                 if (slave_dev->ethtool_ops->get_link) {
 729                         u32 link;
 730
 731                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 732
 733                         return link ? BMSR_LSTATUS : 0;
 734                 }
 735         }
 736
 737         /*
 738          * If reporting, report that either there's no dev->do_ioctl,
 739          * or both SIOCGMIIREG and get_link failed (meaning that we
 740          * cannot report link status).  If not reporting, pretend
 741          * we're ok.
 742          */
 743         return (reporting ? -1 : BMSR_LSTATUS);
 744 }
 745
 746 /*----------------------------- Multicast list ------------------------------*/
 747
 748 /*
 749  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
 750  */
 751 static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
 752 {
 753         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
 754                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
 755 }
 756
 757 /*
 758  * returns dmi entry if found, NULL otherwise
 759  */
 760 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
 761 {
 762         struct dev_mc_list *idmi;
 763
 764         for (idmi = mc_list; idmi; idmi = idmi->next) {
 765                 if (bond_is_dmi_same(dmi, idmi)) {
 766                         return idmi;
 767                 }
 768         }
 769
 770         return NULL;
 771 }
 772
 773 /*
 774  * Push the promiscuity flag down to appropriate slaves
 775  */
 776 static int bond_set_promiscuity(struct bonding *bond, int inc)
 777 {
 778         int err = 0;
 779         if (USES_PRIMARY(bond->params.mode)) {
 780                 /* write lock already acquired */
 781                 if (bond->curr_active_slave) {
 782                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 783                                                   inc);
 784                 }
 785         } else {
 786                 struct slave *slave;
 787                 int i;
 788                 bond_for_each_slave(bond, slave, i) {
 789                         err = dev_set_promiscuity(slave->dev, inc);
 790                         if (err)
 791                                 return err;
 792                 }
 793         }
 794         return err;
 795 }
 796
 797 /*
 798  * Push the allmulti flag down to all slaves
 799  */
 800 static int bond_set_allmulti(struct bonding *bond, int inc)
 801 {
 802         int err = 0;
 803         if (USES_PRIMARY(bond->params.mode)) {
 804                 /* write lock already acquired */
 805                 if (bond->curr_active_slave) {
 806                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 807                                                inc);
 808                 }
 809         } else {
 810                 struct slave *slave;
 811                 int i;
 812                 bond_for_each_slave(bond, slave, i) {
 813                         err = dev_set_allmulti(slave->dev, inc);
 814                         if (err)
 815                                 return err;
 816                 }
 817         }
 818         return err;
 819 }
 820
 821 /*
 822  * Add a Multicast address to slaves
 823  * according to mode
 824  */
 825 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
 826 {
 827         if (USES_PRIMARY(bond->params.mode)) {
 828                 /* write lock already acquired */
 829                 if (bond->curr_active_slave) {
 830                         dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
 831                 }
 832         } else {
 833                 struct slave *slave;
 834                 int i;
 835                 bond_for_each_slave(bond, slave, i) {
 836                         dev_mc_add(slave->dev, addr, alen, 0);
 837                 }
 838         }
 839 }
 840
 841 /*
 842  * Remove a multicast address from slave
 843  * according to mode
 844  */
 845 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
 846 {
 847         if (USES_PRIMARY(bond->params.mode)) {
 848                 /* write lock already acquired */
 849                 if (bond->curr_active_slave) {
 850                         dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
 851                 }
 852         } else {
 853                 struct slave *slave;
 854                 int i;
 855                 bond_for_each_slave(bond, slave, i) {
 856                         dev_mc_delete(slave->dev, addr, alen, 0);
 857                 }
 858         }
 859 }
 860
 861
 862 /*
 863  * Retrieve the list of registered multicast addresses for the bonding
 864  * device and retransmit an IGMP JOIN request to the current active
 865  * slave.
 866  */
 867 static void bond_resend_igmp_join_requests(struct bonding *bond)
 868 {
 869         struct in_device *in_dev;
 870         struct ip_mc_list *im;
 871
 872         rcu_read_lock();
 873         in_dev = __in_dev_get_rcu(bond->dev);
 874         if (in_dev) {
 875                 for (im = in_dev->mc_list; im; im = im->next) {
 876                         ip_mc_rejoin_group(im);
 877                 }
 878         }
 879
 880         rcu_read_unlock();
 881 }
 882
 883 /*
 884  * Totally destroys the mc_list in bond
 885  */
 886 static void bond_mc_list_destroy(struct bonding *bond)
 887 {
 888         struct dev_mc_list *dmi;
 889
 890         dmi = bond->mc_list;
 891         while (dmi) {
 892                 bond->mc_list = dmi->next;
 893                 kfree(dmi);
 894                 dmi = bond->mc_list;
 895         }
 896         bond->mc_list = NULL;
 897 }
 898
 899 /*
 900  * Copy all the Multicast addresses from src to the bonding device dst
 901  */
 902 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
 903                              gfp_t gfp_flag)
 904 {
 905         struct dev_mc_list *dmi, *new_dmi;
 906
 907         for (dmi = mc_list; dmi; dmi = dmi->next) {
 908                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
 909
 910                 if (!new_dmi) {
 911                         /* FIXME: Potential memory leak !!! */
 912                         return -ENOMEM;
 913                 }
 914
 915                 new_dmi->next = bond->mc_list;
 916                 bond->mc_list = new_dmi;
 917                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
 918                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
 919                 new_dmi->dmi_users = dmi->dmi_users;
 920                 new_dmi->dmi_gusers = dmi->dmi_gusers;
 921         }
 922
 923         return 0;
 924 }
 925
 926 /*
 927  * flush all members of flush->mc_list from device dev->mc_list
 928  */
 929 static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
 930 {
 931         struct bonding *bond = netdev_priv(bond_dev);
 932         struct dev_mc_list *dmi;
 933
 934         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
 935                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 936         }
 937
 938         if (bond->params.mode == BOND_MODE_8023AD) {
 939                 /* del lacpdu mc addr from mc list */
 940                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 941
 942                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
 943         }
 944 }
 945
 946 /*--------------------------- Active slave change ---------------------------*/
 947
 948 /*
 949  * Update the mc list and multicast-related flags for the new and
 950  * old active slaves (if any) according to the multicast mode, and
 951  * promiscuous flags unconditionally.
 952  */
 953 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
 954 {
 955         struct dev_mc_list *dmi;
 956
 957         if (!USES_PRIMARY(bond->params.mode)) {
 958                 /* nothing to do -  mc list is already up-to-date on
 959                  * all slaves
 960                  */
 961                 return;
 962         }
 963
 964         if (old_active) {
 965                 if (bond->dev->flags & IFF_PROMISC) {
 966                         dev_set_promiscuity(old_active->dev, -1);
 967                 }
 968
 969                 if (bond->dev->flags & IFF_ALLMULTI) {
 970                         dev_set_allmulti(old_active->dev, -1);
 971                 }
 972
 973                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 974                         dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 975                 }
 976         }
 977
 978         if (new_active) {
 979                 /* FIXME: Signal errors upstream. */
 980                 if (bond->dev->flags & IFF_PROMISC) {
 981                         dev_set_promiscuity(new_active->dev, 1);
 982                 }
 983
 984                 if (bond->dev->flags & IFF_ALLMULTI) {
 985                         dev_set_allmulti(new_active->dev, 1);
 986                 }
 987
 988                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 989                         dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 990                 }
 991                 bond_resend_igmp_join_requests(bond);
 992         }
 993 }
 994
 995 /*
 996  * bond_do_fail_over_mac
 997  *
 998  * Perform special MAC address swapping for fail_over_mac settings
 999  *
1000  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
1001  */
1002 static void bond_do_fail_over_mac(struct bonding *bond,
1003                                   struct slave *new_active,
1004                                   struct slave *old_active)
1005         __releases(&bond->curr_slave_lock)
1006         __releases(&bond->lock)
1007         __acquires(&bond->lock)
1008         __acquires(&bond->curr_slave_lock)
1009 {
1010         u8 tmp_mac[ETH_ALEN];
1011         struct sockaddr saddr;
1012         int rv;
1013
1014         switch (bond->params.fail_over_mac) {
1015         case BOND_FOM_ACTIVE:
1016                 if (new_active)
1017                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
1018                                new_active->dev->addr_len);
1019                 break;
1020         case BOND_FOM_FOLLOW:
1021                 /*
1022                  * if new_active && old_active, swap them
1023                  * if just old_active, do nothing (going to no active slave)
1024                  * if just new_active, set new_active to bond's MAC
1025                  */
1026                 if (!new_active)
1027                         return;
1028
1029                 write_unlock_bh(&bond->curr_slave_lock);
1030                 read_unlock(&bond->lock);
1031
1032                 if (old_active) {
1033                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1034                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
1035                                ETH_ALEN);
1036                         saddr.sa_family = new_active->dev->type;
1037                 } else {
1038                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1039                         saddr.sa_family = bond->dev->type;
1040                 }
1041
1042                 rv = dev_set_mac_address(new_active->dev, &saddr);
1043                 if (rv) {
1044                         printk(KERN_ERR DRV_NAME
1045                                ": %s: Error %d setting MAC of slave %s\n",
1046                                bond->dev->name, -rv, new_active->dev->name);
1047                         goto out;
1048                 }
1049
1050                 if (!old_active)
1051                         goto out;
1052
1053                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1054                 saddr.sa_family = old_active->dev->type;
1055
1056                 rv = dev_set_mac_address(old_active->dev, &saddr);
1057                 if (rv)
1058                         printk(KERN_ERR DRV_NAME
1059                                ": %s: Error %d setting MAC of slave %s\n",
1060                                bond->dev->name, -rv, new_active->dev->name);
1061 out:
1062                 read_lock(&bond->lock);
1063                 write_lock_bh(&bond->curr_slave_lock);
1064                 break;
1065         default:
1066                 printk(KERN_ERR DRV_NAME
1067                        ": %s: bond_do_fail_over_mac impossible: bad policy %d\n",
1068                        bond->dev->name, bond->params.fail_over_mac);
1069                 break;
1070         }
1071
1072 }
1073
1074
1075 /**
1076  * find_best_interface - select the best available slave to be the active one
1077  * @bond: our bonding struct
1078  *
1079  * Warning: Caller must hold curr_slave_lock for writing.
1080  */
1081 static struct slave *bond_find_best_slave(struct bonding *bond)
1082 {
1083         struct slave *new_active, *old_active;
1084         struct slave *bestslave = NULL;
1085         int mintime = bond->params.updelay;
1086         int i;
1087
1088         new_active = old_active = bond->curr_active_slave;
1089
1090         if (!new_active) { /* there were no active slaves left */
1091                 if (bond->slave_cnt > 0) {  /* found one slave */
1092                         new_active = bond->first_slave;
1093                 } else {
1094                         return NULL; /* still no slave, return NULL */
1095                 }
1096         }
1097
1098         /* first try the primary link; if arping, a link must tx/rx traffic
1099          * before it can be considered the curr_active_slave - also, we would skip
1100          * slaves between the curr_active_slave and primary_slave that may be up
1101          * and able to arp
1102          */
1103         if ((bond->primary_slave) &&
1104             (!bond->params.arp_interval) &&
1105             (IS_UP(bond->primary_slave->dev))) {
1106                 new_active = bond->primary_slave;
1107         }
1108
1109         /* remember where to stop iterating over the slaves */
1110         old_active = new_active;
1111
1112         bond_for_each_slave_from(bond, new_active, i, old_active) {
1113                 if (IS_UP(new_active->dev)) {
1114                         if (new_active->link == BOND_LINK_UP) {
1115                                 return new_active;
1116                         } else if (new_active->link == BOND_LINK_BACK) {
1117                                 /* link up, but waiting for stabilization */
1118                                 if (new_active->delay < mintime) {
1119                                         mintime = new_active->delay;
1120                                         bestslave = new_active;
1121                                 }
1122                         }
1123                 }
1124         }
1125
1126         return bestslave;
1127 }
1128
1129 /**
1130  * change_active_interface - change the active slave into the specified one
1131  * @bond: our bonding struct
1132  * @new: the new slave to make the active one
1133  *
1134  * Set the new slave to the bond's settings and unset them on the old
1135  * curr_active_slave.
1136  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1137  *
1138  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1139  * because it is apparently the best available slave we have, even though its
1140  * updelay hasn't timed out yet.
1141  *
1142  * If new_active is not NULL, caller must hold bond->lock for read and
1143  * curr_slave_lock for write_bh.
1144  */
1145 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1146 {
1147         struct slave *old_active = bond->curr_active_slave;
1148
1149         if (old_active == new_active) {
1150                 return;
1151         }
1152
1153         if (new_active) {
1154                 new_active->jiffies = jiffies;
1155
1156                 if (new_active->link == BOND_LINK_BACK) {
1157                         if (USES_PRIMARY(bond->params.mode)) {
1158                                 printk(KERN_INFO DRV_NAME
1159                                        ": %s: making interface %s the new "
1160                                        "active one %d ms earlier.\n",
1161                                        bond->dev->name, new_active->dev->name,
1162                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1163                         }
1164
1165                         new_active->delay = 0;
1166                         new_active->link = BOND_LINK_UP;
1167
1168                         if (bond->params.mode == BOND_MODE_8023AD) {
1169                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1170                         }
1171
1172                         if (bond_is_lb(bond))
1173                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1174                 } else {
1175                         if (USES_PRIMARY(bond->params.mode)) {
1176                                 printk(KERN_INFO DRV_NAME
1177                                        ": %s: making interface %s the new "
1178                                        "active one.\n",
1179                                        bond->dev->name, new_active->dev->name);
1180                         }
1181                 }
1182         }
1183
1184         if (USES_PRIMARY(bond->params.mode)) {
1185                 bond_mc_swap(bond, new_active, old_active);
1186         }
1187
1188         if (bond_is_lb(bond)) {
1189                 bond_alb_handle_active_change(bond, new_active);
1190                 if (old_active)
1191                         bond_set_slave_inactive_flags(old_active);
1192                 if (new_active)
1193                         bond_set_slave_active_flags(new_active);
1194         } else {
1195                 bond->curr_active_slave = new_active;
1196         }
1197
1198         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1199                 if (old_active) {
1200                         bond_set_slave_inactive_flags(old_active);
1201                 }
1202
1203                 if (new_active) {
1204                         bond_set_slave_active_flags(new_active);
1205
1206                         if (bond->params.fail_over_mac)
1207                                 bond_do_fail_over_mac(bond, new_active,
1208                                                       old_active);
1209
1210                         bond->send_grat_arp = bond->params.num_grat_arp;
1211                         bond_send_gratuitous_arp(bond);
1212
1213                         bond->send_unsol_na = bond->params.num_unsol_na;
1214                         bond_send_unsolicited_na(bond);
1215
1216                         write_unlock_bh(&bond->curr_slave_lock);
1217                         read_unlock(&bond->lock);
1218
1219                         netdev_bonding_change(bond->dev);
1220
1221                         read_lock(&bond->lock);
1222                         write_lock_bh(&bond->curr_slave_lock);
1223                 }
1224         }
1225 }
1226
1227 /**
1228  * bond_select_active_slave - select a new active slave, if needed
1229  * @bond: our bonding struct
1230  *
1231  * This functions shoud be called when one of the following occurs:
1232  * - The old curr_active_slave has been released or lost its link.
1233  * - The primary_slave has got its link back.
1234  * - A slave has got its link back and there's no old curr_active_slave.
1235  *
1236  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1237  */
1238 void bond_select_active_slave(struct bonding *bond)
1239 {
1240         struct slave *best_slave;
1241         int rv;
1242
1243         best_slave = bond_find_best_slave(bond);
1244         if (best_slave != bond->curr_active_slave) {
1245                 bond_change_active_slave(bond, best_slave);
1246                 rv = bond_set_carrier(bond);
1247                 if (!rv)
1248                         return;
1249
1250                 if (netif_carrier_ok(bond->dev)) {
1251                         printk(KERN_INFO DRV_NAME
1252                                ": %s: first active interface up!\n",
1253                                bond->dev->name);
1254                 } else {
1255                         printk(KERN_INFO DRV_NAME ": %s: "
1256                                "now running without any active interface !\n",
1257                                bond->dev->name);
1258                 }
1259         }
1260 }
1261
1262 /*--------------------------- slave list handling ---------------------------*/
1263
1264 /*
1265  * This function attaches the slave to the end of list.
1266  *
1267  * bond->lock held for writing by caller.
1268  */
1269 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1270 {
1271         if (bond->first_slave == NULL) { /* attaching the first slave */
1272                 new_slave->next = new_slave;
1273                 new_slave->prev = new_slave;
1274                 bond->first_slave = new_slave;
1275         } else {
1276                 new_slave->next = bond->first_slave;
1277                 new_slave->prev = bond->first_slave->prev;
1278                 new_slave->next->prev = new_slave;
1279                 new_slave->prev->next = new_slave;
1280         }
1281
1282         bond->slave_cnt++;
1283 }
1284
1285 /*
1286  * This function detaches the slave from the list.
1287  * WARNING: no check is made to verify if the slave effectively
1288  * belongs to <bond>.
1289  * Nothing is freed on return, structures are just unchained.
1290  * If any slave pointer in bond was pointing to <slave>,
1291  * it should be changed by the calling function.
1292  *
1293  * bond->lock held for writing by caller.
1294  */
1295 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1296 {
1297         if (slave->next) {
1298                 slave->next->prev = slave->prev;
1299         }
1300
1301         if (slave->prev) {
1302                 slave->prev->next = slave->next;
1303         }
1304
1305         if (bond->first_slave == slave) { /* slave is the first slave */
1306                 if (bond->slave_cnt > 1) { /* there are more slave */
1307                         bond->first_slave = slave->next;
1308                 } else {
1309                         bond->first_slave = NULL; /* slave was the last one */
1310                 }
1311         }
1312
1313         slave->next = NULL;
1314         slave->prev = NULL;
1315         bond->slave_cnt--;
1316 }
1317
1318 /*---------------------------------- IOCTL ----------------------------------*/
1319
1320 static int bond_sethwaddr(struct net_device *bond_dev,
1321                           struct net_device *slave_dev)
1322 {
1323         pr_debug("bond_dev=%p\n", bond_dev);
1324         pr_debug("slave_dev=%p\n", slave_dev);
1325         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1326         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1327         return 0;
1328 }
1329
1330 #define BOND_VLAN_FEATURES \
1331         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1332          NETIF_F_HW_VLAN_FILTER)
1333
1334 /*
1335  * Compute the common dev->feature set available to all slaves.  Some
1336  * feature bits are managed elsewhere, so preserve those feature bits
1337  * on the master device.
1338  */
1339 static int bond_compute_features(struct bonding *bond)
1340 {
1341         struct slave *slave;
1342         struct net_device *bond_dev = bond->dev;
1343         unsigned long features = bond_dev->features;
1344         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1345                                                 bond_dev->hard_header_len);
1346         int i;
1347
1348         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1349         features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1350
1351         if (!bond->first_slave)
1352                 goto done;
1353
1354         features &= ~NETIF_F_ONE_FOR_ALL;
1355
1356         bond_for_each_slave(bond, slave, i) {
1357                 features = netdev_increment_features(features,
1358                                                      slave->dev->features,
1359                                                      NETIF_F_ONE_FOR_ALL);
1360                 if (slave->dev->hard_header_len > max_hard_header_len)
1361                         max_hard_header_len = slave->dev->hard_header_len;
1362         }
1363
1364 done:
1365         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1366         bond_dev->features = netdev_fix_features(features, NULL);
1367         bond_dev->hard_header_len = max_hard_header_len;
1368
1369         return 0;
1370 }
1371
1372 static void bond_setup_by_slave(struct net_device *bond_dev,
1373                                 struct net_device *slave_dev)
1374 {
1375         struct bonding *bond = netdev_priv(bond_dev);
1376
1377         bond_dev->header_ops        = slave_dev->header_ops;
1378
1379         bond_dev->type              = slave_dev->type;
1380         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1381         bond_dev->addr_len          = slave_dev->addr_len;
1382
1383         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1384                 slave_dev->addr_len);
1385         bond->setup_by_slave = 1;
1386 }
1387
1388 /* enslave device <slave> to bond device <master> */
1389 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1390 {
1391         struct bonding *bond = netdev_priv(bond_dev);
1392         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1393         struct slave *new_slave = NULL;
1394         struct dev_mc_list *dmi;
1395         struct sockaddr addr;
1396         int link_reporting;
1397         int old_features = bond_dev->features;
1398         int res = 0;
1399
1400         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1401                 slave_ops->ndo_do_ioctl == NULL) {
1402                 printk(KERN_WARNING DRV_NAME
1403                        ": %s: Warning: no link monitoring support for %s\n",
1404                        bond_dev->name, slave_dev->name);
1405         }
1406
1407         /* bond must be initialized by bond_open() before enslaving */
1408         if (!(bond_dev->flags & IFF_UP)) {
1409                 printk(KERN_WARNING DRV_NAME
1410                         " %s: master_dev is not up in bond_enslave\n",
1411                         bond_dev->name);
1412         }
1413
1414         /* already enslaved */
1415         if (slave_dev->flags & IFF_SLAVE) {
1416                 pr_debug("Error, Device was already enslaved\n");
1417                 return -EBUSY;
1418         }
1419
1420         /* vlan challenged mutual exclusion */
1421         /* no need to lock since we're protected by rtnl_lock */
1422         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1423                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1424                 if (!list_empty(&bond->vlan_list)) {
1425                         printk(KERN_ERR DRV_NAME
1426                                ": %s: Error: cannot enslave VLAN "
1427                                "challenged slave %s on VLAN enabled "
1428                                "bond %s\n", bond_dev->name, slave_dev->name,
1429                                bond_dev->name);
1430                         return -EPERM;
1431                 } else {
1432                         printk(KERN_WARNING DRV_NAME
1433                                ": %s: Warning: enslaved VLAN challenged "
1434                                "slave %s. Adding VLANs will be blocked as "
1435                                "long as %s is part of bond %s\n",
1436                                bond_dev->name, slave_dev->name, slave_dev->name,
1437                                bond_dev->name);
1438                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1439                 }
1440         } else {
1441                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1442                 if (bond->slave_cnt == 0) {
1443                         /* First slave, and it is not VLAN challenged,
1444                          * so remove the block of adding VLANs over the bond.
1445                          */
1446                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1447                 }
1448         }
1449
1450         /*
1451          * Old ifenslave binaries are no longer supported.  These can
1452          * be identified with moderate accurary by the state of the slave:
1453          * the current ifenslave will set the interface down prior to
1454          * enslaving it; the old ifenslave will not.
1455          */
1456         if ((slave_dev->flags & IFF_UP)) {
1457                 printk(KERN_ERR DRV_NAME ": %s is up. "
1458                        "This may be due to an out of date ifenslave.\n",
1459                        slave_dev->name);
1460                 res = -EPERM;
1461                 goto err_undo_flags;
1462         }
1463
1464         /* set bonding device ether type by slave - bonding netdevices are
1465          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1466          * there is a need to override some of the type dependent attribs/funcs.
1467          *
1468          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1469          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1470          */
1471         if (bond->slave_cnt == 0) {
1472                 if (slave_dev->type != ARPHRD_ETHER)
1473                         bond_setup_by_slave(bond_dev, slave_dev);
1474         } else if (bond_dev->type != slave_dev->type) {
1475                 printk(KERN_ERR DRV_NAME ": %s ether type (%d) is different "
1476                         "from other slaves (%d), can not enslave it.\n",
1477                         slave_dev->name,
1478                         slave_dev->type, bond_dev->type);
1479                         res = -EINVAL;
1480                         goto err_undo_flags;
1481         }
1482
1483         if (slave_ops->ndo_set_mac_address == NULL) {
1484                 if (bond->slave_cnt == 0) {
1485                         printk(KERN_WARNING DRV_NAME
1486                                ": %s: Warning: The first slave device "
1487                                "specified does not support setting the MAC "
1488                                "address. Setting fail_over_mac to active.",
1489                                bond_dev->name);
1490                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1491                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1492                         printk(KERN_ERR DRV_NAME
1493                                 ": %s: Error: The slave device specified "
1494                                 "does not support setting the MAC address, "
1495                                 "but fail_over_mac is not set to active.\n"
1496                                 , bond_dev->name);
1497                         res = -EOPNOTSUPP;
1498                         goto err_undo_flags;
1499                 }
1500         }
1501
1502         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1503         if (!new_slave) {
1504                 res = -ENOMEM;
1505                 goto err_undo_flags;
1506         }
1507
1508         /* save slave's original flags before calling
1509          * netdev_set_master and dev_open
1510          */
1511         new_slave->original_flags = slave_dev->flags;
1512
1513         /*
1514          * Save slave's original ("permanent") mac address for modes
1515          * that need it, and for restoring it upon release, and then
1516          * set it to the master's address
1517          */
1518         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1519
1520         if (!bond->params.fail_over_mac) {
1521                 /*
1522                  * Set slave to master's mac address.  The application already
1523                  * set the master's mac address to that of the first slave
1524                  */
1525                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1526                 addr.sa_family = slave_dev->type;
1527                 res = dev_set_mac_address(slave_dev, &addr);
1528                 if (res) {
1529                         pr_debug("Error %d calling set_mac_address\n", res);
1530                         goto err_free;
1531                 }
1532         }
1533
1534         res = netdev_set_master(slave_dev, bond_dev);
1535         if (res) {
1536                 pr_debug("Error %d calling netdev_set_master\n", res);
1537                 goto err_restore_mac;
1538         }
1539         /* open the slave since the application closed it */
1540         res = dev_open(slave_dev);
1541         if (res) {
1542                 pr_debug("Openning slave %s failed\n", slave_dev->name);
1543                 goto err_unset_master;
1544         }
1545
1546         new_slave->dev = slave_dev;
1547         slave_dev->priv_flags |= IFF_BONDING;
1548
1549         if (bond_is_lb(bond)) {
1550                 /* bond_alb_init_slave() must be called before all other stages since
1551                  * it might fail and we do not want to have to undo everything
1552                  */
1553                 res = bond_alb_init_slave(bond, new_slave);
1554                 if (res) {
1555                         goto err_close;
1556                 }
1557         }
1558
1559         /* If the mode USES_PRIMARY, then the new slave gets the
1560          * master's promisc (and mc) settings only if it becomes the
1561          * curr_active_slave, and that is taken care of later when calling
1562          * bond_change_active()
1563          */
1564         if (!USES_PRIMARY(bond->params.mode)) {
1565                 /* set promiscuity level to new slave */
1566                 if (bond_dev->flags & IFF_PROMISC) {
1567                         res = dev_set_promiscuity(slave_dev, 1);
1568                         if (res)
1569                                 goto err_close;
1570                 }
1571
1572                 /* set allmulti level to new slave */
1573                 if (bond_dev->flags & IFF_ALLMULTI) {
1574                         res = dev_set_allmulti(slave_dev, 1);
1575                         if (res)
1576                                 goto err_close;
1577                 }
1578
1579                 netif_addr_lock_bh(bond_dev);
1580                 /* upload master's mc_list to new slave */
1581                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1582                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1583                 }
1584                 netif_addr_unlock_bh(bond_dev);
1585         }
1586
1587         if (bond->params.mode == BOND_MODE_8023AD) {
1588                 /* add lacpdu mc addr to mc list */
1589                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1590
1591                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1592         }
1593
1594         bond_add_vlans_on_slave(bond, slave_dev);
1595
1596         write_lock_bh(&bond->lock);
1597
1598         bond_attach_slave(bond, new_slave);
1599
1600         new_slave->delay = 0;
1601         new_slave->link_failure_count = 0;
1602
1603         bond_compute_features(bond);
1604
1605         write_unlock_bh(&bond->lock);
1606
1607         read_lock(&bond->lock);
1608
1609         new_slave->last_arp_rx = jiffies;
1610
1611         if (bond->params.miimon && !bond->params.use_carrier) {
1612                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1613
1614                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1615                         /*
1616                          * miimon is set but a bonded network driver
1617                          * does not support ETHTOOL/MII and
1618                          * arp_interval is not set.  Note: if
1619                          * use_carrier is enabled, we will never go
1620                          * here (because netif_carrier is always
1621                          * supported); thus, we don't need to change
1622                          * the messages for netif_carrier.
1623                          */
1624                         printk(KERN_WARNING DRV_NAME
1625                                ": %s: Warning: MII and ETHTOOL support not "
1626                                "available for interface %s, and "
1627                                "arp_interval/arp_ip_target module parameters "
1628                                "not specified, thus bonding will not detect "
1629                                "link failures! see bonding.txt for details.\n",
1630                                bond_dev->name, slave_dev->name);
1631                 } else if (link_reporting == -1) {
1632                         /* unable get link status using mii/ethtool */
1633                         printk(KERN_WARNING DRV_NAME
1634                                ": %s: Warning: can't get link status from "
1635                                "interface %s; the network driver associated "
1636                                "with this interface does not support MII or "
1637                                "ETHTOOL link status reporting, thus miimon "
1638                                "has no effect on this interface.\n",
1639                                bond_dev->name, slave_dev->name);
1640                 }
1641         }
1642
1643         /* check for initial state */
1644         if (!bond->params.miimon ||
1645             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1646                 if (bond->params.updelay) {
1647                         pr_debug("Initial state of slave_dev is "
1648                                 "BOND_LINK_BACK\n");
1649                         new_slave->link  = BOND_LINK_BACK;
1650                         new_slave->delay = bond->params.updelay;
1651                 } else {
1652                         pr_debug("Initial state of slave_dev is "
1653                                 "BOND_LINK_UP\n");
1654                         new_slave->link  = BOND_LINK_UP;
1655                 }
1656                 new_slave->jiffies = jiffies;
1657         } else {
1658                 pr_debug("Initial state of slave_dev is "
1659                         "BOND_LINK_DOWN\n");
1660                 new_slave->link  = BOND_LINK_DOWN;
1661         }
1662
1663         if (bond_update_speed_duplex(new_slave) &&
1664             (new_slave->link != BOND_LINK_DOWN)) {
1665                 printk(KERN_WARNING DRV_NAME
1666                        ": %s: Warning: failed to get speed and duplex from %s, "
1667                        "assumed to be 100Mb/sec and Full.\n",
1668                        bond_dev->name, new_slave->dev->name);
1669
1670                 if (bond->params.mode == BOND_MODE_8023AD) {
1671                         printk(KERN_WARNING DRV_NAME
1672                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1673                                "support in base driver for proper aggregator "
1674                                "selection.\n", bond_dev->name);
1675                 }
1676         }
1677
1678         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1679                 /* if there is a primary slave, remember it */
1680                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1681                         bond->primary_slave = new_slave;
1682                 }
1683         }
1684
1685         write_lock_bh(&bond->curr_slave_lock);
1686
1687         switch (bond->params.mode) {
1688         case BOND_MODE_ACTIVEBACKUP:
1689                 bond_set_slave_inactive_flags(new_slave);
1690                 bond_select_active_slave(bond);
1691                 break;
1692         case BOND_MODE_8023AD:
1693                 /* in 802.3ad mode, the internal mechanism
1694                  * will activate the slaves in the selected
1695                  * aggregator
1696                  */
1697                 bond_set_slave_inactive_flags(new_slave);
1698                 /* if this is the first slave */
1699                 if (bond->slave_cnt == 1) {
1700                         SLAVE_AD_INFO(new_slave).id = 1;
1701                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1702                          * can be called only after the mac address of the bond is set
1703                          */
1704                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1705                                             bond->params.lacp_fast);
1706                 } else {
1707                         SLAVE_AD_INFO(new_slave).id =
1708                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1709                 }
1710
1711                 bond_3ad_bind_slave(new_slave);
1712                 break;
1713         case BOND_MODE_TLB:
1714         case BOND_MODE_ALB:
1715                 new_slave->state = BOND_STATE_ACTIVE;
1716                 bond_set_slave_inactive_flags(new_slave);
1717                 bond_select_active_slave(bond);
1718                 break;
1719         default:
1720                 pr_debug("This slave is always active in trunk mode\n");
1721
1722                 /* always active in trunk mode */
1723                 new_slave->state = BOND_STATE_ACTIVE;
1724
1725                 /* In trunking mode there is little meaning to curr_active_slave
1726                  * anyway (it holds no special properties of the bond device),
1727                  * so we can change it without calling change_active_interface()
1728                  */
1729                 if (!bond->curr_active_slave) {
1730                         bond->curr_active_slave = new_slave;
1731                 }
1732                 break;
1733         } /* switch(bond_mode) */
1734
1735         write_unlock_bh(&bond->curr_slave_lock);
1736
1737         bond_set_carrier(bond);
1738
1739         read_unlock(&bond->lock);
1740
1741         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1742         if (res)
1743                 goto err_close;
1744
1745         printk(KERN_INFO DRV_NAME
1746                ": %s: enslaving %s as a%s interface with a%s link.\n",
1747                bond_dev->name, slave_dev->name,
1748                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1749                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1750
1751         /* enslave is successful */
1752         return 0;
1753
1754 /* Undo stages on error */
1755 err_close:
1756         dev_close(slave_dev);
1757
1758 err_unset_master:
1759         netdev_set_master(slave_dev, NULL);
1760
1761 err_restore_mac:
1762         if (!bond->params.fail_over_mac) {
1763                 /* XXX TODO - fom follow mode needs to change master's
1764                  * MAC if this slave's MAC is in use by the bond, or at
1765                  * least print a warning.
1766                  */
1767                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1768                 addr.sa_family = slave_dev->type;
1769                 dev_set_mac_address(slave_dev, &addr);
1770         }
1771
1772 err_free:
1773         kfree(new_slave);
1774
1775 err_undo_flags:
1776         bond_dev->features = old_features;
1777
1778         return res;
1779 }
1780
1781 /*
1782  * Try to release the slave device <slave> from the bond device <master>
1783  * It is legal to access curr_active_slave without a lock because all the function
1784  * is write-locked.
1785  *
1786  * The rules for slave state should be:
1787  *   for Active/Backup:
1788  *     Active stays on all backups go down
1789  *   for Bonded connections:
1790  *     The first up interface should be left on and all others downed.
1791  */
1792 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1793 {
1794         struct bonding *bond = netdev_priv(bond_dev);
1795         struct slave *slave, *oldcurrent;
1796         struct sockaddr addr;
1797         int mac_addr_differ;
1798
1799         /* slave is not a slave or master is not master of this slave */
1800         if (!(slave_dev->flags & IFF_SLAVE) ||
1801             (slave_dev->master != bond_dev)) {
1802                 printk(KERN_ERR DRV_NAME
1803                        ": %s: Error: cannot release %s.\n",
1804                        bond_dev->name, slave_dev->name);
1805                 return -EINVAL;
1806         }
1807
1808         write_lock_bh(&bond->lock);
1809
1810         slave = bond_get_slave_by_dev(bond, slave_dev);
1811         if (!slave) {
1812                 /* not a slave of this bond */
1813                 printk(KERN_INFO DRV_NAME
1814                        ": %s: %s not enslaved\n",
1815                        bond_dev->name, slave_dev->name);
1816                 write_unlock_bh(&bond->lock);
1817                 return -EINVAL;
1818         }
1819
1820         if (!bond->params.fail_over_mac) {
1821                 mac_addr_differ = memcmp(bond_dev->dev_addr, slave->perm_hwaddr,
1822                                          ETH_ALEN);
1823                 if (!mac_addr_differ && (bond->slave_cnt > 1))
1824                         printk(KERN_WARNING DRV_NAME
1825                                ": %s: Warning: the permanent HWaddr of %s - "
1826                                "%pM - is still in use by %s. "
1827                                "Set the HWaddr of %s to a different address "
1828                                "to avoid conflicts.\n",
1829                                bond_dev->name, slave_dev->name,
1830                                slave->perm_hwaddr,
1831                                bond_dev->name, slave_dev->name);
1832         }
1833
1834         /* Inform AD package of unbinding of slave. */
1835         if (bond->params.mode == BOND_MODE_8023AD) {
1836                 /* must be called before the slave is
1837                  * detached from the list
1838                  */
1839                 bond_3ad_unbind_slave(slave);
1840         }
1841
1842         printk(KERN_INFO DRV_NAME
1843                ": %s: releasing %s interface %s\n",
1844                bond_dev->name,
1845                (slave->state == BOND_STATE_ACTIVE)
1846                ? "active" : "backup",
1847                slave_dev->name);
1848
1849         oldcurrent = bond->curr_active_slave;
1850
1851         bond->current_arp_slave = NULL;
1852
1853         /* release the slave from its bond */
1854         bond_detach_slave(bond, slave);
1855
1856         bond_compute_features(bond);
1857
1858         if (bond->primary_slave == slave) {
1859                 bond->primary_slave = NULL;
1860         }
1861
1862         if (oldcurrent == slave) {
1863                 bond_change_active_slave(bond, NULL);
1864         }
1865
1866         if (bond_is_lb(bond)) {
1867                 /* Must be called only after the slave has been
1868                  * detached from the list and the curr_active_slave
1869                  * has been cleared (if our_slave == old_current),
1870                  * but before a new active slave is selected.
1871                  */
1872                 write_unlock_bh(&bond->lock);
1873                 bond_alb_deinit_slave(bond, slave);
1874                 write_lock_bh(&bond->lock);
1875         }
1876
1877         if (oldcurrent == slave) {
1878                 /*
1879                  * Note that we hold RTNL over this sequence, so there
1880                  * is no concern that another slave add/remove event
1881                  * will interfere.
1882                  */
1883                 write_unlock_bh(&bond->lock);
1884                 read_lock(&bond->lock);
1885                 write_lock_bh(&bond->curr_slave_lock);
1886
1887                 bond_select_active_slave(bond);
1888
1889                 write_unlock_bh(&bond->curr_slave_lock);
1890                 read_unlock(&bond->lock);
1891                 write_lock_bh(&bond->lock);
1892         }
1893
1894         if (bond->slave_cnt == 0) {
1895                 bond_set_carrier(bond);
1896
1897                 /* if the last slave was removed, zero the mac address
1898                  * of the master so it will be set by the application
1899                  * to the mac address of the first slave
1900                  */
1901                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1902
1903                 if (list_empty(&bond->vlan_list)) {
1904                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1905                 } else {
1906                         printk(KERN_WARNING DRV_NAME
1907                                ": %s: Warning: clearing HW address of %s while it "
1908                                "still has VLANs.\n",
1909                                bond_dev->name, bond_dev->name);
1910                         printk(KERN_WARNING DRV_NAME
1911                                ": %s: When re-adding slaves, make sure the bond's "
1912                                "HW address matches its VLANs'.\n",
1913                                bond_dev->name);
1914                 }
1915         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1916                    !bond_has_challenged_slaves(bond)) {
1917                 printk(KERN_INFO DRV_NAME
1918                        ": %s: last VLAN challenged slave %s "
1919                        "left bond %s. VLAN blocking is removed\n",
1920                        bond_dev->name, slave_dev->name, bond_dev->name);
1921                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1922         }
1923
1924         write_unlock_bh(&bond->lock);
1925
1926         /* must do this from outside any spinlocks */
1927         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1928
1929         bond_del_vlans_from_slave(bond, slave_dev);
1930
1931         /* If the mode USES_PRIMARY, then we should only remove its
1932          * promisc and mc settings if it was the curr_active_slave, but that was
1933          * already taken care of above when we detached the slave
1934          */
1935         if (!USES_PRIMARY(bond->params.mode)) {
1936                 /* unset promiscuity level from slave */
1937                 if (bond_dev->flags & IFF_PROMISC) {
1938                         dev_set_promiscuity(slave_dev, -1);
1939                 }
1940
1941                 /* unset allmulti level from slave */
1942                 if (bond_dev->flags & IFF_ALLMULTI) {
1943                         dev_set_allmulti(slave_dev, -1);
1944                 }
1945
1946                 /* flush master's mc_list from slave */
1947                 netif_addr_lock_bh(bond_dev);
1948                 bond_mc_list_flush(bond_dev, slave_dev);
1949                 netif_addr_unlock_bh(bond_dev);
1950         }
1951
1952         netdev_set_master(slave_dev, NULL);
1953
1954         /* close slave before restoring its mac address */
1955         dev_close(slave_dev);
1956
1957         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1958                 /* restore original ("permanent") mac address */
1959                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1960                 addr.sa_family = slave_dev->type;
1961                 dev_set_mac_address(slave_dev, &addr);
1962         }
1963
1964         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1965                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1966                                    IFF_SLAVE_NEEDARP);
1967
1968         kfree(slave);
1969
1970         return 0;  /* deletion OK */
1971 }
1972
1973 /*
1974 * Destroy a bonding device.
1975 * Must be under rtnl_lock when this function is called.
1976 */
1977 void bond_destroy(struct bonding *bond)
1978 {
1979         bond_deinit(bond->dev);
1980         bond_destroy_sysfs_entry(bond);
1981         unregister_netdevice(bond->dev);
1982 }
1983
1984 static void bond_destructor(struct net_device *bond_dev)
1985 {
1986         struct bonding *bond = netdev_priv(bond_dev);
1987
1988         if (bond->wq)
1989                 destroy_workqueue(bond->wq);
1990
1991         netif_addr_lock_bh(bond_dev);
1992         bond_mc_list_destroy(bond);
1993         netif_addr_unlock_bh(bond_dev);
1994
1995         free_netdev(bond_dev);
1996 }
1997
1998 /*
1999 * First release a slave and than destroy the bond if no more slaves iare left.
2000 * Must be under rtnl_lock when this function is called.
2001 */
2002 int  bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev)
2003 {
2004         struct bonding *bond = netdev_priv(bond_dev);
2005         int ret;
2006
2007         ret = bond_release(bond_dev, slave_dev);
2008         if ((ret == 0) && (bond->slave_cnt == 0)) {
2009                 printk(KERN_INFO DRV_NAME ": %s: destroying bond %s.\n",
2010                        bond_dev->name, bond_dev->name);
2011                 bond_destroy(bond);
2012         }
2013         return ret;
2014 }
2015
2016 /*
2017  * This function releases all slaves.
2018  */
2019 static int bond_release_all(struct net_device *bond_dev)
2020 {
2021         struct bonding *bond = netdev_priv(bond_dev);
2022         struct slave *slave;
2023         struct net_device *slave_dev;
2024         struct sockaddr addr;
2025
2026         write_lock_bh(&bond->lock);
2027
2028         netif_carrier_off(bond_dev);
2029
2030         if (bond->slave_cnt == 0) {
2031                 goto out;
2032         }
2033
2034         bond->current_arp_slave = NULL;
2035         bond->primary_slave = NULL;
2036         bond_change_active_slave(bond, NULL);
2037
2038         while ((slave = bond->first_slave) != NULL) {
2039                 /* Inform AD package of unbinding of slave
2040                  * before slave is detached from the list.
2041                  */
2042                 if (bond->params.mode == BOND_MODE_8023AD) {
2043                         bond_3ad_unbind_slave(slave);
2044                 }
2045
2046                 slave_dev = slave->dev;
2047                 bond_detach_slave(bond, slave);
2048
2049                 /* now that the slave is detached, unlock and perform
2050                  * all the undo steps that should not be called from
2051                  * within a lock.
2052                  */
2053                 write_unlock_bh(&bond->lock);
2054
2055                 if (bond_is_lb(bond)) {
2056                         /* must be called only after the slave
2057                          * has been detached from the list
2058                          */
2059                         bond_alb_deinit_slave(bond, slave);
2060                 }
2061
2062                 bond_compute_features(bond);
2063
2064                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2065                 bond_del_vlans_from_slave(bond, slave_dev);
2066
2067                 /* If the mode USES_PRIMARY, then we should only remove its
2068                  * promisc and mc settings if it was the curr_active_slave, but that was
2069                  * already taken care of above when we detached the slave
2070                  */
2071                 if (!USES_PRIMARY(bond->params.mode)) {
2072                         /* unset promiscuity level from slave */
2073                         if (bond_dev->flags & IFF_PROMISC) {
2074                                 dev_set_promiscuity(slave_dev, -1);
2075                         }
2076
2077                         /* unset allmulti level from slave */
2078                         if (bond_dev->flags & IFF_ALLMULTI) {
2079                                 dev_set_allmulti(slave_dev, -1);
2080                         }
2081
2082                         /* flush master's mc_list from slave */
2083                         netif_addr_lock_bh(bond_dev);
2084                         bond_mc_list_flush(bond_dev, slave_dev);
2085                         netif_addr_unlock_bh(bond_dev);
2086                 }
2087
2088                 netdev_set_master(slave_dev, NULL);
2089
2090                 /* close slave before restoring its mac address */
2091                 dev_close(slave_dev);
2092
2093                 if (!bond->params.fail_over_mac) {
2094                         /* restore original ("permanent") mac address*/
2095                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2096                         addr.sa_family = slave_dev->type;
2097                         dev_set_mac_address(slave_dev, &addr);
2098                 }
2099
2100                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2101                                            IFF_SLAVE_INACTIVE);
2102
2103                 kfree(slave);
2104
2105                 /* re-acquire the lock before getting the next slave */
2106                 write_lock_bh(&bond->lock);
2107         }
2108
2109         /* zero the mac address of the master so it will be
2110          * set by the application to the mac address of the
2111          * first slave
2112          */
2113         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2114
2115         if (list_empty(&bond->vlan_list)) {
2116                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2117         } else {
2118                 printk(KERN_WARNING DRV_NAME
2119                        ": %s: Warning: clearing HW address of %s while it "
2120                        "still has VLANs.\n",
2121                        bond_dev->name, bond_dev->name);
2122                 printk(KERN_WARNING DRV_NAME
2123                        ": %s: When re-adding slaves, make sure the bond's "
2124                        "HW address matches its VLANs'.\n",
2125                        bond_dev->name);
2126         }
2127
2128         printk(KERN_INFO DRV_NAME
2129                ": %s: released all slaves\n",
2130                bond_dev->name);
2131
2132 out:
2133         write_unlock_bh(&bond->lock);
2134
2135         return 0;
2136 }
2137
2138 /*
2139  * This function changes the active slave to slave <slave_dev>.
2140  * It returns -EINVAL in the following cases.
2141  *  - <slave_dev> is not found in the list.
2142  *  - There is not active slave now.
2143  *  - <slave_dev> is already active.
2144  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2145  *  - <slave_dev> is not running.
2146  * In these cases, this fuction does nothing.
2147  * In the other cases, currnt_slave pointer is changed and 0 is returned.
2148  */
2149 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2150 {
2151         struct bonding *bond = netdev_priv(bond_dev);
2152         struct slave *old_active = NULL;
2153         struct slave *new_active = NULL;
2154         int res = 0;
2155
2156         if (!USES_PRIMARY(bond->params.mode)) {
2157                 return -EINVAL;
2158         }
2159
2160         /* Verify that master_dev is indeed the master of slave_dev */
2161         if (!(slave_dev->flags & IFF_SLAVE) ||
2162             (slave_dev->master != bond_dev)) {
2163                 return -EINVAL;
2164         }
2165
2166         read_lock(&bond->lock);
2167
2168         read_lock(&bond->curr_slave_lock);
2169         old_active = bond->curr_active_slave;
2170         read_unlock(&bond->curr_slave_lock);
2171
2172         new_active = bond_get_slave_by_dev(bond, slave_dev);
2173
2174         /*
2175          * Changing to the current active: do nothing; return success.
2176          */
2177         if (new_active && (new_active == old_active)) {
2178                 read_unlock(&bond->lock);
2179                 return 0;
2180         }
2181
2182         if ((new_active) &&
2183             (old_active) &&
2184             (new_active->link == BOND_LINK_UP) &&
2185             IS_UP(new_active->dev)) {
2186                 write_lock_bh(&bond->curr_slave_lock);
2187                 bond_change_active_slave(bond, new_active);
2188                 write_unlock_bh(&bond->curr_slave_lock);
2189         } else {
2190                 res = -EINVAL;
2191         }
2192
2193         read_unlock(&bond->lock);
2194
2195         return res;
2196 }
2197
2198 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2199 {
2200         struct bonding *bond = netdev_priv(bond_dev);
2201
2202         info->bond_mode = bond->params.mode;
2203         info->miimon = bond->params.miimon;
2204
2205         read_lock(&bond->lock);
2206         info->num_slaves = bond->slave_cnt;
2207         read_unlock(&bond->lock);
2208
2209         return 0;
2210 }
2211
2212 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2213 {
2214         struct bonding *bond = netdev_priv(bond_dev);
2215         struct slave *slave;
2216         int i, found = 0;
2217
2218         if (info->slave_id < 0) {
2219                 return -ENODEV;
2220         }
2221
2222         read_lock(&bond->lock);
2223
2224         bond_for_each_slave(bond, slave, i) {
2225                 if (i == (int)info->slave_id) {
2226                         found = 1;
2227                         break;
2228                 }
2229         }
2230
2231         read_unlock(&bond->lock);
2232
2233         if (found) {
2234                 strcpy(info->slave_name, slave->dev->name);
2235                 info->link = slave->link;
2236                 info->state = slave->state;
2237                 info->link_failure_count = slave->link_failure_count;
2238         } else {
2239                 return -ENODEV;
2240         }
2241
2242         return 0;
2243 }
2244
2245 /*-------------------------------- Monitoring -------------------------------*/
2246
2247
2248 static int bond_miimon_inspect(struct bonding *bond)
2249 {
2250         struct slave *slave;
2251         int i, link_state, commit = 0;
2252
2253         bond_for_each_slave(bond, slave, i) {
2254                 slave->new_link = BOND_LINK_NOCHANGE;
2255
2256                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2257
2258                 switch (slave->link) {
2259                 case BOND_LINK_UP:
2260                         if (link_state)
2261                                 continue;
2262
2263                         slave->link = BOND_LINK_FAIL;
2264                         slave->delay = bond->params.downdelay;
2265                         if (slave->delay) {
2266                                 printk(KERN_INFO DRV_NAME
2267                                        ": %s: link status down for %s"
2268                                        "interface %s, disabling it in %d ms.\n",
2269                                        bond->dev->name,
2270                                        (bond->params.mode ==
2271                                         BOND_MODE_ACTIVEBACKUP) ?
2272                                        ((slave->state == BOND_STATE_ACTIVE) ?
2273                                         "active " : "backup ") : "",
2274                                        slave->dev->name,
2275                                        bond->params.downdelay * bond->params.miimon);
2276                         }
2277                         /*FALLTHRU*/
2278                 case BOND_LINK_FAIL:
2279                         if (link_state) {
2280                                 /*
2281                                  * recovered before downdelay expired
2282                                  */
2283                                 slave->link = BOND_LINK_UP;
2284                                 slave->jiffies = jiffies;
2285                                 printk(KERN_INFO DRV_NAME
2286                                        ": %s: link status up again after %d "
2287                                        "ms for interface %s.\n",
2288                                        bond->dev->name,
2289                                        (bond->params.downdelay - slave->delay) *
2290                                        bond->params.miimon,
2291                                        slave->dev->name);
2292                                 continue;
2293                         }
2294
2295                         if (slave->delay <= 0) {
2296                                 slave->new_link = BOND_LINK_DOWN;
2297                                 commit++;
2298                                 continue;
2299                         }
2300
2301                         slave->delay--;
2302                         break;
2303
2304                 case BOND_LINK_DOWN:
2305                         if (!link_state)
2306                                 continue;
2307
2308                         slave->link = BOND_LINK_BACK;
2309                         slave->delay = bond->params.updelay;
2310
2311                         if (slave->delay) {
2312                                 printk(KERN_INFO DRV_NAME
2313                                        ": %s: link status up for "
2314                                        "interface %s, enabling it in %d ms.\n",
2315                                        bond->dev->name, slave->dev->name,
2316                                        bond->params.updelay *
2317                                        bond->params.miimon);
2318                         }
2319                         /*FALLTHRU*/
2320                 case BOND_LINK_BACK:
2321                         if (!link_state) {
2322                                 slave->link = BOND_LINK_DOWN;
2323                                 printk(KERN_INFO DRV_NAME
2324                                        ": %s: link status down again after %d "
2325                                        "ms for interface %s.\n",
2326                                        bond->dev->name,
2327                                        (bond->params.updelay - slave->delay) *
2328                                        bond->params.miimon,
2329                                        slave->dev->name);
2330
2331                                 continue;
2332                         }
2333
2334                         if (slave->delay <= 0) {
2335                                 slave->new_link = BOND_LINK_UP;
2336                                 commit++;
2337                                 continue;
2338                         }
2339
2340                         slave->delay--;
2341                         break;
2342                 }
2343         }
2344
2345         return commit;
2346 }
2347
2348 static void bond_miimon_commit(struct bonding *bond)
2349 {
2350         struct slave *slave;
2351         int i;
2352
2353         bond_for_each_slave(bond, slave, i) {
2354                 switch (slave->new_link) {
2355                 case BOND_LINK_NOCHANGE:
2356                         continue;
2357
2358                 case BOND_LINK_UP:
2359                         slave->link = BOND_LINK_UP;
2360                         slave->jiffies = jiffies;
2361
2362                         if (bond->params.mode == BOND_MODE_8023AD) {
2363                                 /* prevent it from being the active one */
2364                                 slave->state = BOND_STATE_BACKUP;
2365                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2366                                 /* make it immediately active */
2367                                 slave->state = BOND_STATE_ACTIVE;
2368                         } else if (slave != bond->primary_slave) {
2369                                 /* prevent it from being the active one */
2370                                 slave->state = BOND_STATE_BACKUP;
2371                         }
2372
2373                         printk(KERN_INFO DRV_NAME
2374                                ": %s: link status definitely "
2375                                "up for interface %s.\n",
2376                                bond->dev->name, slave->dev->name);
2377
2378                         /* notify ad that the link status has changed */
2379                         if (bond->params.mode == BOND_MODE_8023AD)
2380                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2381
2382                         if (bond_is_lb(bond))
2383                                 bond_alb_handle_link_change(bond, slave,
2384                                                             BOND_LINK_UP);
2385
2386                         if (!bond->curr_active_slave ||
2387                             (slave == bond->primary_slave))
2388                                 goto do_failover;
2389
2390                         continue;
2391
2392                 case BOND_LINK_DOWN:
2393                         if (slave->link_failure_count < UINT_MAX)
2394                                 slave->link_failure_count++;
2395
2396                         slave->link = BOND_LINK_DOWN;
2397
2398                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2399                             bond->params.mode == BOND_MODE_8023AD)
2400                                 bond_set_slave_inactive_flags(slave);
2401
2402                         printk(KERN_INFO DRV_NAME
2403                                ": %s: link status definitely down for "
2404                                "interface %s, disabling it\n",
2405                                bond->dev->name, slave->dev->name);
2406
2407                         if (bond->params.mode == BOND_MODE_8023AD)
2408                                 bond_3ad_handle_link_change(slave,
2409                                                             BOND_LINK_DOWN);
2410
2411                         if (bond->params.mode == BOND_MODE_TLB ||
2412                             bond->params.mode == BOND_MODE_ALB)
2413                                 bond_alb_handle_link_change(bond, slave,
2414                                                             BOND_LINK_DOWN);
2415
2416                         if (slave == bond->curr_active_slave)
2417                                 goto do_failover;
2418
2419                         continue;
2420
2421                 default:
2422                         printk(KERN_ERR DRV_NAME
2423                                ": %s: invalid new link %d on slave %s\n",
2424                                bond->dev->name, slave->new_link,
2425                                slave->dev->name);
2426                         slave->new_link = BOND_LINK_NOCHANGE;
2427
2428                         continue;
2429                 }
2430
2431 do_failover:
2432                 ASSERT_RTNL();
2433                 write_lock_bh(&bond->curr_slave_lock);
2434                 bond_select_active_slave(bond);
2435                 write_unlock_bh(&bond->curr_slave_lock);
2436         }
2437
2438         bond_set_carrier(bond);
2439 }
2440
2441 /*
2442  * bond_mii_monitor
2443  *
2444  * Really a wrapper that splits the mii monitor into two phases: an
2445  * inspection, then (if inspection indicates something needs to be done)
2446  * an acquisition of appropriate locks followed by a commit phase to
2447  * implement whatever link state changes are indicated.
2448  */
2449 void bond_mii_monitor(struct work_struct *work)
2450 {
2451         struct bonding *bond = container_of(work, struct bonding,
2452                                             mii_work.work);
2453
2454         read_lock(&bond->lock);
2455         if (bond->kill_timers)
2456                 goto out;
2457
2458         if (bond->slave_cnt == 0)
2459                 goto re_arm;
2460
2461         if (bond->send_grat_arp) {
2462                 read_lock(&bond->curr_slave_lock);
2463                 bond_send_gratuitous_arp(bond);
2464                 read_unlock(&bond->curr_slave_lock);
2465         }
2466
2467         if (bond->send_unsol_na) {
2468                 read_lock(&bond->curr_slave_lock);
2469                 bond_send_unsolicited_na(bond);
2470                 read_unlock(&bond->curr_slave_lock);
2471         }
2472
2473         if (bond_miimon_inspect(bond)) {
2474                 read_unlock(&bond->lock);
2475                 rtnl_lock();
2476                 read_lock(&bond->lock);
2477
2478                 bond_miimon_commit(bond);
2479
2480                 read_unlock(&bond->lock);
2481                 rtnl_unlock();  /* might sleep, hold no other locks */
2482                 read_lock(&bond->lock);
2483         }
2484
2485 re_arm:
2486         if (bond->params.miimon)
2487                 queue_delayed_work(bond->wq, &bond->mii_work,
2488                                    msecs_to_jiffies(bond->params.miimon));
2489 out:
2490         read_unlock(&bond->lock);
2491 }
2492
2493 static __be32 bond_glean_dev_ip(struct net_device *dev)
2494 {
2495         struct in_device *idev;
2496         struct in_ifaddr *ifa;
2497         __be32 addr = 0;
2498
2499         if (!dev)
2500                 return 0;
2501
2502         rcu_read_lock();
2503         idev = __in_dev_get_rcu(dev);
2504         if (!idev)
2505                 goto out;
2506
2507         ifa = idev->ifa_list;
2508         if (!ifa)
2509                 goto out;
2510
2511         addr = ifa->ifa_local;
2512 out:
2513         rcu_read_unlock();
2514         return addr;
2515 }
2516
2517 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2518 {
2519         struct vlan_entry *vlan;
2520
2521         if (ip == bond->master_ip)
2522                 return 1;
2523
2524         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2525                 if (ip == vlan->vlan_ip)
2526                         return 1;
2527         }
2528
2529         return 0;
2530 }
2531
2532 /*
2533  * We go to the (large) trouble of VLAN tagging ARP frames because
2534  * switches in VLAN mode (especially if ports are configured as
2535  * "native" to a VLAN) might not pass non-tagged frames.
2536  */
2537 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2538 {
2539         struct sk_buff *skb;
2540
2541         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2542                slave_dev->name, dest_ip, src_ip, vlan_id);
2543
2544         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2545                          NULL, slave_dev->dev_addr, NULL);
2546
2547         if (!skb) {
2548                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2549                 return;
2550         }
2551         if (vlan_id) {
2552                 skb = vlan_put_tag(skb, vlan_id);
2553                 if (!skb) {
2554                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2555                         return;
2556                 }
2557         }
2558         arp_xmit(skb);
2559 }
2560
2561
2562 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2563 {
2564         int i, vlan_id, rv;
2565         __be32 *targets = bond->params.arp_targets;
2566         struct vlan_entry *vlan;
2567         struct net_device *vlan_dev;
2568         struct flowi fl;
2569         struct rtable *rt;
2570
2571         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2572                 if (!targets[i])
2573                         continue;
2574                 pr_debug("basa: target %x\n", targets[i]);
2575                 if (list_empty(&bond->vlan_list)) {
2576                         pr_debug("basa: empty vlan: arp_send\n");
2577                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2578                                       bond->master_ip, 0);
2579                         continue;
2580                 }
2581
2582                 /*
2583                  * If VLANs are configured, we do a route lookup to
2584                  * determine which VLAN interface would be used, so we
2585                  * can tag the ARP with the proper VLAN tag.
2586                  */
2587                 memset(&fl, 0, sizeof(fl));
2588                 fl.fl4_dst = targets[i];
2589                 fl.fl4_tos = RTO_ONLINK;
2590
2591                 rv = ip_route_output_key(&init_net, &rt, &fl);
2592                 if (rv) {
2593                         if (net_ratelimit()) {
2594                                 printk(KERN_WARNING DRV_NAME
2595                              ": %s: no route to arp_ip_target %pI4\n",
2596                                        bond->dev->name, &fl.fl4_dst);
2597                         }
2598                         continue;
2599                 }
2600
2601                 /*
2602                  * This target is not on a VLAN
2603                  */
2604                 if (rt->u.dst.dev == bond->dev) {
2605                         ip_rt_put(rt);
2606                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2607                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2608                                       bond->master_ip, 0);
2609                         continue;
2610                 }
2611
2612                 vlan_id = 0;
2613                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2614                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2615                         if (vlan_dev == rt->u.dst.dev) {
2616                                 vlan_id = vlan->vlan_id;
2617                                 pr_debug("basa: vlan match on %s %d\n",
2618                                        vlan_dev->name, vlan_id);
2619                                 break;
2620                         }
2621                 }
2622
2623                 if (vlan_id) {
2624                         ip_rt_put(rt);
2625                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2626                                       vlan->vlan_ip, vlan_id);
2627                         continue;
2628                 }
2629
2630                 if (net_ratelimit()) {
2631                         printk(KERN_WARNING DRV_NAME
2632                ": %s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2633                                bond->dev->name, &fl.fl4_dst,
2634                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2635                 }
2636                 ip_rt_put(rt);
2637         }
2638 }
2639
2640 /*
2641  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2642  * for each VLAN above us.
2643  *
2644  * Caller must hold curr_slave_lock for read or better
2645  */
2646 static void bond_send_gratuitous_arp(struct bonding *bond)
2647 {
2648         struct slave *slave = bond->curr_active_slave;
2649         struct vlan_entry *vlan;
2650         struct net_device *vlan_dev;
2651
2652         pr_debug("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2653                                 slave ? slave->dev->name : "NULL");
2654
2655         if (!slave || !bond->send_grat_arp ||
2656             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2657                 return;
2658
2659         bond->send_grat_arp--;
2660
2661         if (bond->master_ip) {
2662                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2663                                 bond->master_ip, 0);
2664         }
2665
2666         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2667                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2668                 if (vlan->vlan_ip) {
2669                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2670                                       vlan->vlan_ip, vlan->vlan_id);
2671                 }
2672         }
2673 }
2674
2675 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2676 {
2677         int i;
2678         __be32 *targets = bond->params.arp_targets;
2679
2680         targets = bond->params.arp_targets;
2681         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2682                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2683                         &sip, &tip, i, &targets[i], bond_has_this_ip(bond, tip));
2684                 if (sip == targets[i]) {
2685                         if (bond_has_this_ip(bond, tip))
2686                                 slave->last_arp_rx = jiffies;
2687                         return;
2688                 }
2689         }
2690 }
2691
2692 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2693 {
2694         struct arphdr *arp;
2695         struct slave *slave;
2696         struct bonding *bond;
2697         unsigned char *arp_ptr;
2698         __be32 sip, tip;
2699
2700         if (dev_net(dev) != &init_net)
2701                 goto out;
2702
2703         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2704                 goto out;
2705
2706         bond = netdev_priv(dev);
2707         read_lock(&bond->lock);
2708
2709         pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2710                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2711                 orig_dev ? orig_dev->name : "NULL");
2712
2713         slave = bond_get_slave_by_dev(bond, orig_dev);
2714         if (!slave || !slave_do_arp_validate(bond, slave))
2715                 goto out_unlock;
2716
2717         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2718                 goto out_unlock;
2719
2720         arp = arp_hdr(skb);
2721         if (arp->ar_hln != dev->addr_len ||
2722             skb->pkt_type == PACKET_OTHERHOST ||
2723             skb->pkt_type == PACKET_LOOPBACK ||
2724             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2725             arp->ar_pro != htons(ETH_P_IP) ||
2726             arp->ar_pln != 4)
2727                 goto out_unlock;
2728
2729         arp_ptr = (unsigned char *)(arp + 1);
2730         arp_ptr += dev->addr_len;
2731         memcpy(&sip, arp_ptr, 4);
2732         arp_ptr += 4 + dev->addr_len;
2733         memcpy(&tip, arp_ptr, 4);
2734
2735         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2736                 bond->dev->name, slave->dev->name, slave->state,
2737                 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2738                 &sip, &tip);
2739
2740         /*
2741          * Backup slaves won't see the ARP reply, but do come through
2742          * here for each ARP probe (so we swap the sip/tip to validate
2743          * the probe).  In a "redundant switch, common router" type of
2744          * configuration, the ARP probe will (hopefully) travel from
2745          * the active, through one switch, the router, then the other
2746          * switch before reaching the backup.
2747          */
2748         if (slave->state == BOND_STATE_ACTIVE)
2749                 bond_validate_arp(bond, slave, sip, tip);
2750         else
2751                 bond_validate_arp(bond, slave, tip, sip);
2752
2753 out_unlock:
2754         read_unlock(&bond->lock);
2755 out:
2756         dev_kfree_skb(skb);
2757         return NET_RX_SUCCESS;
2758 }
2759
2760 /*
2761  * this function is called regularly to monitor each slave's link
2762  * ensuring that traffic is being sent and received when arp monitoring
2763  * is used in load-balancing mode. if the adapter has been dormant, then an
2764  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2765  * arp monitoring in active backup mode.
2766  */
2767 void bond_loadbalance_arp_mon(struct work_struct *work)
2768 {
2769         struct bonding *bond = container_of(work, struct bonding,
2770                                             arp_work.work);
2771         struct slave *slave, *oldcurrent;
2772         int do_failover = 0;
2773         int delta_in_ticks;
2774         int i;
2775
2776         read_lock(&bond->lock);
2777
2778         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2779
2780         if (bond->kill_timers) {
2781                 goto out;
2782         }
2783
2784         if (bond->slave_cnt == 0) {
2785                 goto re_arm;
2786         }
2787
2788         read_lock(&bond->curr_slave_lock);
2789         oldcurrent = bond->curr_active_slave;
2790         read_unlock(&bond->curr_slave_lock);
2791
2792         /* see if any of the previous devices are up now (i.e. they have
2793          * xmt and rcv traffic). the curr_active_slave does not come into
2794          * the picture unless it is null. also, slave->jiffies is not needed
2795          * here because we send an arp on each slave and give a slave as
2796          * long as it needs to get the tx/rx within the delta.
2797          * TODO: what about up/down delay in arp mode? it wasn't here before
2798          *       so it can wait
2799          */
2800         bond_for_each_slave(bond, slave, i) {
2801                 if (slave->link != BOND_LINK_UP) {
2802                         if (time_before_eq(jiffies, slave->dev->trans_start + delta_in_ticks) &&
2803                             time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
2804
2805                                 slave->link  = BOND_LINK_UP;
2806                                 slave->state = BOND_STATE_ACTIVE;
2807
2808                                 /* primary_slave has no meaning in round-robin
2809                                  * mode. the window of a slave being up and
2810                                  * curr_active_slave being null after enslaving
2811                                  * is closed.
2812                                  */
2813                                 if (!oldcurrent) {
2814                                         printk(KERN_INFO DRV_NAME
2815                                                ": %s: link status definitely "
2816                                                "up for interface %s, ",
2817                                                bond->dev->name,
2818                                                slave->dev->name);
2819                                         do_failover = 1;
2820                                 } else {
2821                                         printk(KERN_INFO DRV_NAME
2822                                                ": %s: interface %s is now up\n",
2823                                                bond->dev->name,
2824                                                slave->dev->name);
2825                                 }
2826                         }
2827                 } else {
2828                         /* slave->link == BOND_LINK_UP */
2829
2830                         /* not all switches will respond to an arp request
2831                          * when the source ip is 0, so don't take the link down
2832                          * if we don't know our ip yet
2833                          */
2834                         if (time_after_eq(jiffies, slave->dev->trans_start + 2*delta_in_ticks) ||
2835                             (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks))) {
2836
2837                                 slave->link  = BOND_LINK_DOWN;
2838                                 slave->state = BOND_STATE_BACKUP;
2839
2840                                 if (slave->link_failure_count < UINT_MAX) {
2841                                         slave->link_failure_count++;
2842                                 }
2843
2844                                 printk(KERN_INFO DRV_NAME
2845                                        ": %s: interface %s is now down.\n",
2846                                        bond->dev->name,
2847                                        slave->dev->name);
2848
2849                                 if (slave == oldcurrent) {
2850                                         do_failover = 1;
2851                                 }
2852                         }
2853                 }
2854
2855                 /* note: if switch is in round-robin mode, all links
2856                  * must tx arp to ensure all links rx an arp - otherwise
2857                  * links may oscillate or not come up at all; if switch is
2858                  * in something like xor mode, there is nothing we can
2859                  * do - all replies will be rx'ed on same link causing slaves
2860                  * to be unstable during low/no traffic periods
2861                  */
2862                 if (IS_UP(slave->dev)) {
2863                         bond_arp_send_all(bond, slave);
2864                 }
2865         }
2866
2867         if (do_failover) {
2868                 write_lock_bh(&bond->curr_slave_lock);
2869
2870                 bond_select_active_slave(bond);
2871
2872                 write_unlock_bh(&bond->curr_slave_lock);
2873         }
2874
2875 re_arm:
2876         if (bond->params.arp_interval)
2877                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2878 out:
2879         read_unlock(&bond->lock);
2880 }
2881
2882 /*
2883  * Called to inspect slaves for active-backup mode ARP monitor link state
2884  * changes.  Sets new_link in slaves to specify what action should take
2885  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2886  * to link states must be committed.
2887  *
2888  * Called with bond->lock held for read.
2889  */
2890 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2891 {
2892         struct slave *slave;
2893         int i, commit = 0;
2894
2895         bond_for_each_slave(bond, slave, i) {
2896                 slave->new_link = BOND_LINK_NOCHANGE;
2897
2898                 if (slave->link != BOND_LINK_UP) {
2899                         if (time_before_eq(jiffies, slave_last_rx(bond, slave) +
2900                                            delta_in_ticks)) {
2901                                 slave->new_link = BOND_LINK_UP;
2902                                 commit++;
2903                         }
2904
2905                         continue;
2906                 }
2907
2908                 /*
2909                  * Give slaves 2*delta after being enslaved or made
2910                  * active.  This avoids bouncing, as the last receive
2911                  * times need a full ARP monitor cycle to be updated.
2912                  */
2913                 if (!time_after_eq(jiffies, slave->jiffies +
2914                                    2 * delta_in_ticks))
2915                         continue;
2916
2917                 /*
2918                  * Backup slave is down if:
2919                  * - No current_arp_slave AND
2920                  * - more than 3*delta since last receive AND
2921                  * - the bond has an IP address
2922                  *
2923                  * Note: a non-null current_arp_slave indicates
2924                  * the curr_active_slave went down and we are
2925                  * searching for a new one; under this condition
2926                  * we only take the curr_active_slave down - this
2927                  * gives each slave a chance to tx/rx traffic
2928                  * before being taken out
2929                  */
2930                 if (slave->state == BOND_STATE_BACKUP &&
2931                     !bond->current_arp_slave &&
2932                     time_after(jiffies, slave_last_rx(bond, slave) +
2933                                3 * delta_in_ticks)) {
2934                         slave->new_link = BOND_LINK_DOWN;
2935                         commit++;
2936                 }
2937
2938                 /*
2939                  * Active slave is down if:
2940                  * - more than 2*delta since transmitting OR
2941                  * - (more than 2*delta since receive AND
2942                  *    the bond has an IP address)
2943                  */
2944                 if ((slave->state == BOND_STATE_ACTIVE) &&
2945                     (time_after_eq(jiffies, slave->dev->trans_start +
2946                                     2 * delta_in_ticks) ||
2947                       (time_after_eq(jiffies, slave_last_rx(bond, slave)
2948                                      + 2 * delta_in_ticks)))) {
2949                         slave->new_link = BOND_LINK_DOWN;
2950                         commit++;
2951                 }
2952         }
2953
2954         read_lock(&bond->curr_slave_lock);
2955
2956         /*
2957          * Trigger a commit if the primary option setting has changed.
2958          */
2959         if (bond->primary_slave &&
2960             (bond->primary_slave != bond->curr_active_slave) &&
2961             (bond->primary_slave->link == BOND_LINK_UP))
2962                 commit++;
2963
2964         read_unlock(&bond->curr_slave_lock);
2965
2966         return commit;
2967 }
2968
2969 /*
2970  * Called to commit link state changes noted by inspection step of
2971  * active-backup mode ARP monitor.
2972  *
2973  * Called with RTNL and bond->lock for read.
2974  */
2975 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2976 {
2977         struct slave *slave;
2978         int i;
2979
2980         bond_for_each_slave(bond, slave, i) {
2981                 switch (slave->new_link) {
2982                 case BOND_LINK_NOCHANGE:
2983                         continue;
2984
2985                 case BOND_LINK_UP:
2986                         write_lock_bh(&bond->curr_slave_lock);
2987
2988                         if (!bond->curr_active_slave &&
2989                             time_before_eq(jiffies, slave->dev->trans_start +
2990                                            delta_in_ticks)) {
2991                                 slave->link = BOND_LINK_UP;
2992                                 bond_change_active_slave(bond, slave);
2993                                 bond->current_arp_slave = NULL;
2994
2995                                 printk(KERN_INFO DRV_NAME
2996                                        ": %s: %s is up and now the "
2997                                        "active interface\n",
2998                                        bond->dev->name, slave->dev->name);
2999
3000                         } else if (bond->curr_active_slave != slave) {
3001                                 /* this slave has just come up but we
3002                                  * already have a current slave; this can
3003                                  * also happen if bond_enslave adds a new
3004                                  * slave that is up while we are searching
3005                                  * for a new slave
3006                                  */
3007                                 slave->link = BOND_LINK_UP;
3008                                 bond_set_slave_inactive_flags(slave);
3009                                 bond->current_arp_slave = NULL;
3010
3011                                 printk(KERN_INFO DRV_NAME
3012                                        ": %s: backup interface %s is now up\n",
3013                                        bond->dev->name, slave->dev->name);
3014                         }
3015
3016                         write_unlock_bh(&bond->curr_slave_lock);
3017
3018                         break;
3019
3020                 case BOND_LINK_DOWN:
3021                         if (slave->link_failure_count < UINT_MAX)
3022                                 slave->link_failure_count++;
3023
3024                         slave->link = BOND_LINK_DOWN;
3025
3026                         if (slave == bond->curr_active_slave) {
3027                                 printk(KERN_INFO DRV_NAME
3028                                        ": %s: link status down for active "
3029                                        "interface %s, disabling it\n",
3030                                        bond->dev->name, slave->dev->name);
3031
3032                                 bond_set_slave_inactive_flags(slave);
3033
3034                                 write_lock_bh(&bond->curr_slave_lock);
3035
3036                                 bond_select_active_slave(bond);
3037                                 if (bond->curr_active_slave)
3038                                         bond->curr_active_slave->jiffies =
3039                                                 jiffies;
3040
3041                                 write_unlock_bh(&bond->curr_slave_lock);
3042
3043                                 bond->current_arp_slave = NULL;
3044
3045                         } else if (slave->state == BOND_STATE_BACKUP) {
3046                                 printk(KERN_INFO DRV_NAME
3047                                        ": %s: backup interface %s is now down\n",
3048                                        bond->dev->name, slave->dev->name);
3049
3050                                 bond_set_slave_inactive_flags(slave);
3051                         }
3052                         break;
3053
3054                 default:
3055                         printk(KERN_ERR DRV_NAME
3056                                ": %s: impossible: new_link %d on slave %s\n",
3057                                bond->dev->name, slave->new_link,
3058                                slave->dev->name);
3059                 }
3060         }
3061
3062         /*
3063          * No race with changes to primary via sysfs, as we hold rtnl.
3064          */
3065         if (bond->primary_slave &&
3066             (bond->primary_slave != bond->curr_active_slave) &&
3067             (bond->primary_slave->link == BOND_LINK_UP)) {
3068                 write_lock_bh(&bond->curr_slave_lock);
3069                 bond_change_active_slave(bond, bond->primary_slave);
3070                 write_unlock_bh(&bond->curr_slave_lock);
3071         }
3072
3073         bond_set_carrier(bond);
3074 }
3075
3076 /*
3077  * Send ARP probes for active-backup mode ARP monitor.
3078  *
3079  * Called with bond->lock held for read.
3080  */
3081 static void bond_ab_arp_probe(struct bonding *bond)
3082 {
3083         struct slave *slave;
3084         int i;
3085
3086         read_lock(&bond->curr_slave_lock);
3087
3088         if (bond->current_arp_slave && bond->curr_active_slave)
3089                 printk("PROBE: c_arp %s && cas %s BAD\n",
3090                        bond->current_arp_slave->dev->name,
3091                        bond->curr_active_slave->dev->name);
3092
3093         if (bond->curr_active_slave) {
3094                 bond_arp_send_all(bond, bond->curr_active_slave);
3095                 read_unlock(&bond->curr_slave_lock);
3096                 return;
3097         }
3098
3099         read_unlock(&bond->curr_slave_lock);
3100
3101         /* if we don't have a curr_active_slave, search for the next available
3102          * backup slave from the current_arp_slave and make it the candidate
3103          * for becoming the curr_active_slave
3104          */
3105
3106         if (!bond->current_arp_slave) {
3107                 bond->current_arp_slave = bond->first_slave;
3108                 if (!bond->current_arp_slave)
3109                         return;
3110         }
3111
3112         bond_set_slave_inactive_flags(bond->current_arp_slave);
3113
3114         /* search for next candidate */
3115         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3116                 if (IS_UP(slave->dev)) {
3117                         slave->link = BOND_LINK_BACK;
3118                         bond_set_slave_active_flags(slave);
3119                         bond_arp_send_all(bond, slave);
3120                         slave->jiffies = jiffies;
3121                         bond->current_arp_slave = slave;
3122                         break;
3123                 }
3124
3125                 /* if the link state is up at this point, we
3126                  * mark it down - this can happen if we have
3127                  * simultaneous link failures and
3128                  * reselect_active_interface doesn't make this
3129                  * one the current slave so it is still marked
3130                  * up when it is actually down
3131                  */
3132                 if (slave->link == BOND_LINK_UP) {
3133                         slave->link = BOND_LINK_DOWN;
3134                         if (slave->link_failure_count < UINT_MAX)
3135                                 slave->link_failure_count++;
3136
3137                         bond_set_slave_inactive_flags(slave);
3138
3139                         printk(KERN_INFO DRV_NAME
3140                                ": %s: backup interface %s is now down.\n",
3141                                bond->dev->name, slave->dev->name);
3142                 }
3143         }
3144 }
3145
3146 void bond_activebackup_arp_mon(struct work_struct *work)
3147 {
3148         struct bonding *bond = container_of(work, struct bonding,
3149                                             arp_work.work);
3150         int delta_in_ticks;
3151
3152         read_lock(&bond->lock);
3153
3154         if (bond->kill_timers)
3155                 goto out;
3156
3157         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3158
3159         if (bond->slave_cnt == 0)
3160                 goto re_arm;
3161
3162         if (bond->send_grat_arp) {
3163                 read_lock(&bond->curr_slave_lock);
3164                 bond_send_gratuitous_arp(bond);
3165                 read_unlock(&bond->curr_slave_lock);
3166         }
3167
3168         if (bond->send_unsol_na) {
3169                 read_lock(&bond->curr_slave_lock);
3170                 bond_send_unsolicited_na(bond);
3171                 read_unlock(&bond->curr_slave_lock);
3172         }
3173
3174         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3175                 read_unlock(&bond->lock);
3176                 rtnl_lock();
3177                 read_lock(&bond->lock);
3178
3179                 bond_ab_arp_commit(bond, delta_in_ticks);
3180
3181                 read_unlock(&bond->lock);
3182                 rtnl_unlock();
3183                 read_lock(&bond->lock);
3184         }
3185
3186         bond_ab_arp_probe(bond);
3187
3188 re_arm:
3189         if (bond->params.arp_interval) {
3190                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3191         }
3192 out:
3193         read_unlock(&bond->lock);
3194 }
3195
3196 /*------------------------------ proc/seq_file-------------------------------*/
3197
3198 #ifdef CONFIG_PROC_FS
3199
3200 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3201         __acquires(&dev_base_lock)
3202         __acquires(&bond->lock)
3203 {
3204         struct bonding *bond = seq->private;
3205         loff_t off = 0;
3206         struct slave *slave;
3207         int i;
3208
3209         /* make sure the bond won't be taken away */
3210         read_lock(&dev_base_lock);
3211         read_lock(&bond->lock);
3212
3213         if (*pos == 0) {
3214                 return SEQ_START_TOKEN;
3215         }
3216
3217         bond_for_each_slave(bond, slave, i) {
3218                 if (++off == *pos) {
3219                         return slave;
3220                 }
3221         }
3222
3223         return NULL;
3224 }
3225
3226 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3227 {
3228         struct bonding *bond = seq->private;
3229         struct slave *slave = v;
3230
3231         ++*pos;
3232         if (v == SEQ_START_TOKEN) {
3233                 return bond->first_slave;
3234         }
3235
3236         slave = slave->next;
3237
3238         return (slave == bond->first_slave) ? NULL : slave;
3239 }
3240
3241 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3242         __releases(&bond->lock)
3243         __releases(&dev_base_lock)
3244 {
3245         struct bonding *bond = seq->private;
3246
3247         read_unlock(&bond->lock);
3248         read_unlock(&dev_base_lock);
3249 }
3250
3251 static void bond_info_show_master(struct seq_file *seq)
3252 {
3253         struct bonding *bond = seq->private;
3254         struct slave *curr;
3255         int i;
3256
3257         read_lock(&bond->curr_slave_lock);
3258         curr = bond->curr_active_slave;
3259         read_unlock(&bond->curr_slave_lock);
3260
3261         seq_printf(seq, "Bonding Mode: %s",
3262                    bond_mode_name(bond->params.mode));
3263
3264         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3265             bond->params.fail_over_mac)
3266                 seq_printf(seq, " (fail_over_mac %s)",
3267                    fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3268
3269         seq_printf(seq, "\n");
3270
3271         if (bond->params.mode == BOND_MODE_XOR ||
3272                 bond->params.mode == BOND_MODE_8023AD) {
3273                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3274                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3275                         bond->params.xmit_policy);
3276         }
3277
3278         if (USES_PRIMARY(bond->params.mode)) {
3279                 seq_printf(seq, "Primary Slave: %s\n",
3280                            (bond->primary_slave) ?
3281                            bond->primary_slave->dev->name : "None");
3282
3283                 seq_printf(seq, "Currently Active Slave: %s\n",
3284                            (curr) ? curr->dev->name : "None");
3285         }
3286
3287         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3288                    "up" : "down");
3289         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3290         seq_printf(seq, "Up Delay (ms): %d\n",
3291                    bond->params.updelay * bond->params.miimon);
3292         seq_printf(seq, "Down Delay (ms): %d\n",
3293                    bond->params.downdelay * bond->params.miimon);
3294
3295
3296         /* ARP information */
3297         if(bond->params.arp_interval > 0) {
3298                 int printed=0;
3299                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3300                                 bond->params.arp_interval);
3301
3302                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3303
3304                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3305                         if (!bond->params.arp_targets[i])
3306                                 continue;
3307                         if (printed)
3308                                 seq_printf(seq, ",");
3309                         seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3310                         printed = 1;
3311                 }
3312                 seq_printf(seq, "\n");
3313         }
3314
3315         if (bond->params.mode == BOND_MODE_8023AD) {
3316                 struct ad_info ad_info;
3317
3318                 seq_puts(seq, "\n802.3ad info\n");
3319                 seq_printf(seq, "LACP rate: %s\n",
3320                            (bond->params.lacp_fast) ? "fast" : "slow");
3321                 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3322                            ad_select_tbl[bond->params.ad_select].modename);
3323
3324                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3325                         seq_printf(seq, "bond %s has no active aggregator\n",
3326                                    bond->dev->name);
3327                 } else {
3328                         seq_printf(seq, "Active Aggregator Info:\n");
3329
3330                         seq_printf(seq, "\tAggregator ID: %d\n",
3331                                    ad_info.aggregator_id);
3332                         seq_printf(seq, "\tNumber of ports: %d\n",
3333                                    ad_info.ports);
3334                         seq_printf(seq, "\tActor Key: %d\n",
3335                                    ad_info.actor_key);
3336                         seq_printf(seq, "\tPartner Key: %d\n",
3337                                    ad_info.partner_key);
3338                         seq_printf(seq, "\tPartner Mac Address: %pM\n",
3339                                    ad_info.partner_system);
3340                 }
3341         }
3342 }
3343
3344 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3345 {
3346         struct bonding *bond = seq->private;
3347
3348         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3349         seq_printf(seq, "MII Status: %s\n",
3350                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3351         seq_printf(seq, "Link Failure Count: %u\n",
3352                    slave->link_failure_count);
3353
3354         seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3355
3356         if (bond->params.mode == BOND_MODE_8023AD) {
3357                 const struct aggregator *agg
3358                         = SLAVE_AD_INFO(slave).port.aggregator;
3359
3360                 if (agg) {
3361                         seq_printf(seq, "Aggregator ID: %d\n",
3362                                    agg->aggregator_identifier);
3363                 } else {
3364                         seq_puts(seq, "Aggregator ID: N/A\n");
3365                 }
3366         }
3367 }
3368
3369 static int bond_info_seq_show(struct seq_file *seq, void *v)
3370 {
3371         if (v == SEQ_START_TOKEN) {
3372                 seq_printf(seq, "%s\n", version);
3373                 bond_info_show_master(seq);
3374         } else {
3375                 bond_info_show_slave(seq, v);
3376         }
3377
3378         return 0;
3379 }
3380
3381 static const struct seq_operations bond_info_seq_ops = {
3382         .start = bond_info_seq_start,
3383         .next  = bond_info_seq_next,
3384         .stop  = bond_info_seq_stop,
3385         .show  = bond_info_seq_show,
3386 };
3387
3388 static int bond_info_open(struct inode *inode, struct file *file)
3389 {
3390         struct seq_file *seq;
3391         struct proc_dir_entry *proc;
3392         int res;
3393
3394         res = seq_open(file, &bond_info_seq_ops);
3395         if (!res) {
3396                 /* recover the pointer buried in proc_dir_entry data */
3397                 seq = file->private_data;
3398                 proc = PDE(inode);
3399                 seq->private = proc->data;
3400         }
3401
3402         return res;
3403 }
3404
3405 static const struct file_operations bond_info_fops = {
3406         .owner   = THIS_MODULE,
3407         .open    = bond_info_open,
3408         .read    = seq_read,
3409         .llseek  = seq_lseek,
3410         .release = seq_release,
3411 };
3412
3413 static int bond_create_proc_entry(struct bonding *bond)
3414 {
3415         struct net_device *bond_dev = bond->dev;
3416
3417         if (bond_proc_dir) {
3418                 bond->proc_entry = proc_create_data(bond_dev->name,
3419                                                     S_IRUGO, bond_proc_dir,
3420                                                     &bond_info_fops, bond);
3421                 if (bond->proc_entry == NULL) {
3422                         printk(KERN_WARNING DRV_NAME
3423                                ": Warning: Cannot create /proc/net/%s/%s\n",
3424                                DRV_NAME, bond_dev->name);
3425                 } else {
3426                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3427                 }
3428         }
3429
3430         return 0;
3431 }
3432
3433 static void bond_remove_proc_entry(struct bonding *bond)
3434 {
3435         if (bond_proc_dir && bond->proc_entry) {
3436                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3437                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3438                 bond->proc_entry = NULL;
3439         }
3440 }
3441
3442 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3443  * Caller must hold rtnl_lock.
3444  */
3445 static void bond_create_proc_dir(void)
3446 {
3447         if (!bond_proc_dir) {
3448                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3449                 if (!bond_proc_dir)
3450                         printk(KERN_WARNING DRV_NAME
3451                                 ": Warning: cannot create /proc/net/%s\n",
3452                                 DRV_NAME);
3453         }
3454 }
3455
3456 /* Destroy the bonding directory under /proc/net, if empty.
3457  * Caller must hold rtnl_lock.
3458  */
3459 static void bond_destroy_proc_dir(void)
3460 {
3461         if (bond_proc_dir) {
3462                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3463                 bond_proc_dir = NULL;
3464         }
3465 }
3466 #endif /* CONFIG_PROC_FS */
3467
3468 /*-------------------------- netdev event handling --------------------------*/
3469
3470 /*
3471  * Change device name
3472  */
3473 static int bond_event_changename(struct bonding *bond)
3474 {
3475 #ifdef CONFIG_PROC_FS
3476         bond_remove_proc_entry(bond);
3477         bond_create_proc_entry(bond);
3478 #endif
3479         down_write(&(bonding_rwsem));
3480         bond_destroy_sysfs_entry(bond);
3481         bond_create_sysfs_entry(bond);
3482         up_write(&(bonding_rwsem));
3483         return NOTIFY_DONE;
3484 }
3485
3486 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3487 {
3488         struct bonding *event_bond = netdev_priv(bond_dev);
3489
3490         switch (event) {
3491         case NETDEV_CHANGENAME:
3492                 return bond_event_changename(event_bond);
3493         case NETDEV_UNREGISTER:
3494                 bond_release_all(event_bond->dev);
3495                 break;
3496         default:
3497                 break;
3498         }
3499
3500         return NOTIFY_DONE;
3501 }
3502
3503 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3504 {
3505         struct net_device *bond_dev = slave_dev->master;
3506         struct bonding *bond = netdev_priv(bond_dev);
3507
3508         switch (event) {
3509         case NETDEV_UNREGISTER:
3510                 if (bond_dev) {
3511                         if (bond->setup_by_slave)
3512                                 bond_release_and_destroy(bond_dev, slave_dev);
3513                         else
3514                                 bond_release(bond_dev, slave_dev);
3515                 }
3516                 break;
3517         case NETDEV_CHANGE:
3518                 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3519                         struct slave *slave;
3520
3521                         slave = bond_get_slave_by_dev(bond, slave_dev);
3522                         if (slave) {
3523                                 u16 old_speed = slave->speed;
3524                                 u16 old_duplex = slave->duplex;
3525
3526                                 bond_update_speed_duplex(slave);
3527
3528                                 if (bond_is_lb(bond))
3529                                         break;
3530
3531                                 if (old_speed != slave->speed)
3532                                         bond_3ad_adapter_speed_changed(slave);
3533                                 if (old_duplex != slave->duplex)
3534                                         bond_3ad_adapter_duplex_changed(slave);
3535                         }
3536                 }
3537
3538                 break;
3539         case NETDEV_DOWN:
3540                 /*
3541                  * ... Or is it this?
3542                  */
3543                 break;
3544         case NETDEV_CHANGEMTU:
3545                 /*
3546                  * TODO: Should slaves be allowed to
3547                  * independently alter their MTU?  For
3548                  * an active-backup bond, slaves need
3549                  * not be the same type of device, so
3550                  * MTUs may vary.  For other modes,
3551                  * slaves arguably should have the
3552                  * same MTUs. To do this, we'd need to
3553                  * take over the slave's change_mtu
3554                  * function for the duration of their
3555                  * servitude.
3556                  */
3557                 break;
3558         case NETDEV_CHANGENAME:
3559                 /*
3560                  * TODO: handle changing the primary's name
3561                  */
3562                 break;
3563         case NETDEV_FEAT_CHANGE:
3564                 bond_compute_features(bond);
3565                 break;
3566         default:
3567                 break;
3568         }
3569
3570         return NOTIFY_DONE;
3571 }
3572
3573 /*
3574  * bond_netdev_event: handle netdev notifier chain events.
3575  *
3576  * This function receives events for the netdev chain.  The caller (an
3577  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3578  * locks for us to safely manipulate the slave devices (RTNL lock,
3579  * dev_probe_lock).
3580  */
3581 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3582 {
3583         struct net_device *event_dev = (struct net_device *)ptr;
3584
3585         if (dev_net(event_dev) != &init_net)
3586                 return NOTIFY_DONE;
3587
3588         pr_debug("event_dev: %s, event: %lx\n",
3589                 (event_dev ? event_dev->name : "None"),
3590                 event);
3591
3592         if (!(event_dev->priv_flags & IFF_BONDING))
3593                 return NOTIFY_DONE;
3594
3595         if (event_dev->flags & IFF_MASTER) {
3596                 pr_debug("IFF_MASTER\n");
3597                 return bond_master_netdev_event(event, event_dev);
3598         }
3599
3600         if (event_dev->flags & IFF_SLAVE) {
3601                 pr_debug("IFF_SLAVE\n");
3602                 return bond_slave_netdev_event(event, event_dev);
3603         }
3604
3605         return NOTIFY_DONE;
3606 }
3607
3608 /*
3609  * bond_inetaddr_event: handle inetaddr notifier chain events.
3610  *
3611  * We keep track of device IPs primarily to use as source addresses in
3612  * ARP monitor probes (rather than spewing out broadcasts all the time).
3613  *
3614  * We track one IP for the main device (if it has one), plus one per VLAN.
3615  */
3616 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3617 {
3618         struct in_ifaddr *ifa = ptr;
3619         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3620         struct bonding *bond;
3621         struct vlan_entry *vlan;
3622
3623         if (dev_net(ifa->ifa_dev->dev) != &init_net)
3624                 return NOTIFY_DONE;
3625
3626         list_for_each_entry(bond, &bond_dev_list, bond_list) {
3627                 if (bond->dev == event_dev) {
3628                         switch (event) {
3629                         case NETDEV_UP:
3630                                 bond->master_ip = ifa->ifa_local;
3631                                 return NOTIFY_OK;
3632                         case NETDEV_DOWN:
3633                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3634                                 return NOTIFY_OK;
3635                         default:
3636                                 return NOTIFY_DONE;
3637                         }
3638                 }
3639
3640                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3641                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3642                         if (vlan_dev == event_dev) {
3643                                 switch (event) {
3644                                 case NETDEV_UP:
3645                                         vlan->vlan_ip = ifa->ifa_local;
3646                                         return NOTIFY_OK;
3647                                 case NETDEV_DOWN:
3648                                         vlan->vlan_ip =
3649                                                 bond_glean_dev_ip(vlan_dev);
3650                                         return NOTIFY_OK;
3651                                 default:
3652                                         return NOTIFY_DONE;
3653                                 }
3654                         }
3655                 }
3656         }
3657         return NOTIFY_DONE;
3658 }
3659
3660 static struct notifier_block bond_netdev_notifier = {
3661         .notifier_call = bond_netdev_event,
3662 };
3663
3664 static struct notifier_block bond_inetaddr_notifier = {
3665         .notifier_call = bond_inetaddr_event,
3666 };
3667
3668 /*-------------------------- Packet type handling ---------------------------*/
3669
3670 /* register to receive lacpdus on a bond */
3671 static void bond_register_lacpdu(struct bonding *bond)
3672 {
3673         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3674
3675         /* initialize packet type */
3676         pk_type->type = PKT_TYPE_LACPDU;
3677         pk_type->dev = bond->dev;
3678         pk_type->func = bond_3ad_lacpdu_recv;
3679
3680         dev_add_pack(pk_type);
3681 }
3682
3683 /* unregister to receive lacpdus on a bond */
3684 static void bond_unregister_lacpdu(struct bonding *bond)
3685 {
3686         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3687 }
3688
3689 void bond_register_arp(struct bonding *bond)
3690 {
3691         struct packet_type *pt = &bond->arp_mon_pt;
3692
3693         if (pt->type)
3694                 return;
3695
3696         pt->type = htons(ETH_P_ARP);
3697         pt->dev = bond->dev;
3698         pt->func = bond_arp_rcv;
3699         dev_add_pack(pt);
3700 }
3701
3702 void bond_unregister_arp(struct bonding *bond)
3703 {
3704         struct packet_type *pt = &bond->arp_mon_pt;
3705
3706         dev_remove_pack(pt);
3707         pt->type = 0;
3708 }
3709
3710 /*---------------------------- Hashing Policies -----------------------------*/
3711
3712 /*
3713  * Hash for the output device based upon layer 2 and layer 3 data. If
3714  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3715  */
3716 static int bond_xmit_hash_policy_l23(struct sk_buff *skb,
3717                                      struct net_device *bond_dev, int count)
3718 {
3719         struct ethhdr *data = (struct ethhdr *)skb->data;
3720         struct iphdr *iph = ip_hdr(skb);
3721
3722         if (skb->protocol == htons(ETH_P_IP)) {
3723                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3724                         (data->h_dest[5] ^ bond_dev->dev_addr[5])) % count;
3725         }
3726
3727         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3728 }
3729
3730 /*
3731  * Hash for the output device based upon layer 3 and layer 4 data. If
3732  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3733  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3734  */
3735 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3736                                     struct net_device *bond_dev, int count)
3737 {
3738         struct ethhdr *data = (struct ethhdr *)skb->data;
3739         struct iphdr *iph = ip_hdr(skb);
3740         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3741         int layer4_xor = 0;
3742
3743         if (skb->protocol == htons(ETH_P_IP)) {
3744                 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3745                     (iph->protocol == IPPROTO_TCP ||
3746                      iph->protocol == IPPROTO_UDP)) {
3747                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3748                 }
3749                 return (layer4_xor ^
3750                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3751
3752         }
3753
3754         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3755 }
3756
3757 /*
3758  * Hash for the output device based upon layer 2 data
3759  */
3760 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3761                                    struct net_device *bond_dev, int count)
3762 {
3763         struct ethhdr *data = (struct ethhdr *)skb->data;
3764
3765         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3766 }
3767
3768 /*-------------------------- Device entry points ----------------------------*/
3769
3770 static int bond_open(struct net_device *bond_dev)
3771 {
3772         struct bonding *bond = netdev_priv(bond_dev);
3773
3774         bond->kill_timers = 0;
3775
3776         if (bond_is_lb(bond)) {
3777                 /* bond_alb_initialize must be called before the timer
3778                  * is started.
3779                  */
3780                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3781                         /* something went wrong - fail the open operation */
3782                         return -1;
3783                 }
3784
3785                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3786                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3787         }
3788
3789         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3790                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3791                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3792         }
3793
3794         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3795                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3796                         INIT_DELAYED_WORK(&bond->arp_work,
3797                                           bond_activebackup_arp_mon);
3798                 else
3799                         INIT_DELAYED_WORK(&bond->arp_work,
3800                                           bond_loadbalance_arp_mon);
3801
3802                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3803                 if (bond->params.arp_validate)
3804                         bond_register_arp(bond);
3805         }
3806
3807         if (bond->params.mode == BOND_MODE_8023AD) {
3808                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3809                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3810                 /* register to receive LACPDUs */
3811                 bond_register_lacpdu(bond);
3812                 bond_3ad_initiate_agg_selection(bond, 1);
3813         }
3814
3815         return 0;
3816 }
3817
3818 static int bond_close(struct net_device *bond_dev)
3819 {
3820         struct bonding *bond = netdev_priv(bond_dev);
3821
3822         if (bond->params.mode == BOND_MODE_8023AD) {
3823                 /* Unregister the receive of LACPDUs */
3824                 bond_unregister_lacpdu(bond);
3825         }
3826
3827         if (bond->params.arp_validate)
3828                 bond_unregister_arp(bond);
3829
3830         write_lock_bh(&bond->lock);
3831
3832         bond->send_grat_arp = 0;
3833         bond->send_unsol_na = 0;
3834
3835         /* signal timers not to re-arm */
3836         bond->kill_timers = 1;
3837
3838         write_unlock_bh(&bond->lock);
3839
3840         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3841                 cancel_delayed_work(&bond->mii_work);
3842         }
3843
3844         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3845                 cancel_delayed_work(&bond->arp_work);
3846         }
3847
3848         switch (bond->params.mode) {
3849         case BOND_MODE_8023AD:
3850                 cancel_delayed_work(&bond->ad_work);
3851                 break;
3852         case BOND_MODE_TLB:
3853         case BOND_MODE_ALB:
3854                 cancel_delayed_work(&bond->alb_work);
3855                 break;
3856         default:
3857                 break;
3858         }
3859
3860
3861         if (bond_is_lb(bond)) {
3862                 /* Must be called only after all
3863                  * slaves have been released
3864                  */
3865                 bond_alb_deinitialize(bond);
3866         }
3867
3868         return 0;
3869 }
3870
3871 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3872 {
3873         struct bonding *bond = netdev_priv(bond_dev);
3874         struct net_device_stats *stats = &bond->stats;
3875         struct net_device_stats local_stats;
3876         struct slave *slave;
3877         int i;
3878
3879         memset(&local_stats, 0, sizeof(struct net_device_stats));
3880
3881         read_lock_bh(&bond->lock);
3882
3883         bond_for_each_slave(bond, slave, i) {
3884                 const struct net_device_stats *sstats = dev_get_stats(slave->dev);
3885
3886                 local_stats.rx_packets += sstats->rx_packets;
3887                 local_stats.rx_bytes += sstats->rx_bytes;
3888                 local_stats.rx_errors += sstats->rx_errors;
3889                 local_stats.rx_dropped += sstats->rx_dropped;
3890
3891                 local_stats.tx_packets += sstats->tx_packets;
3892                 local_stats.tx_bytes += sstats->tx_bytes;
3893                 local_stats.tx_errors += sstats->tx_errors;
3894                 local_stats.tx_dropped += sstats->tx_dropped;
3895
3896                 local_stats.multicast += sstats->multicast;
3897                 local_stats.collisions += sstats->collisions;
3898
3899                 local_stats.rx_length_errors += sstats->rx_length_errors;
3900                 local_stats.rx_over_errors += sstats->rx_over_errors;
3901                 local_stats.rx_crc_errors += sstats->rx_crc_errors;
3902                 local_stats.rx_frame_errors += sstats->rx_frame_errors;
3903                 local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
3904                 local_stats.rx_missed_errors += sstats->rx_missed_errors;
3905
3906                 local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
3907                 local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
3908                 local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
3909                 local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3910                 local_stats.tx_window_errors += sstats->tx_window_errors;
3911         }
3912
3913         memcpy(stats, &local_stats, sizeof(struct net_device_stats));
3914
3915         read_unlock_bh(&bond->lock);
3916
3917         return stats;
3918 }
3919
3920 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3921 {
3922         struct net_device *slave_dev = NULL;
3923         struct ifbond k_binfo;
3924         struct ifbond __user *u_binfo = NULL;
3925         struct ifslave k_sinfo;
3926         struct ifslave __user *u_sinfo = NULL;
3927         struct mii_ioctl_data *mii = NULL;
3928         int res = 0;
3929
3930         pr_debug("bond_ioctl: master=%s, cmd=%d\n",
3931                 bond_dev->name, cmd);
3932
3933         switch (cmd) {
3934         case SIOCGMIIPHY:
3935                 mii = if_mii(ifr);
3936                 if (!mii) {
3937                         return -EINVAL;
3938                 }
3939                 mii->phy_id = 0;
3940                 /* Fall Through */
3941         case SIOCGMIIREG:
3942                 /*
3943                  * We do this again just in case we were called by SIOCGMIIREG
3944                  * instead of SIOCGMIIPHY.
3945                  */
3946                 mii = if_mii(ifr);
3947                 if (!mii) {
3948                         return -EINVAL;
3949                 }
3950
3951                 if (mii->reg_num == 1) {
3952                         struct bonding *bond = netdev_priv(bond_dev);
3953                         mii->val_out = 0;
3954                         read_lock(&bond->lock);
3955                         read_lock(&bond->curr_slave_lock);
3956                         if (netif_carrier_ok(bond->dev)) {
3957                                 mii->val_out = BMSR_LSTATUS;
3958                         }
3959                         read_unlock(&bond->curr_slave_lock);
3960                         read_unlock(&bond->lock);
3961                 }
3962
3963                 return 0;
3964         case BOND_INFO_QUERY_OLD:
3965         case SIOCBONDINFOQUERY:
3966                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3967
3968                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3969                         return -EFAULT;
3970                 }
3971
3972                 res = bond_info_query(bond_dev, &k_binfo);
3973                 if (res == 0) {
3974                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3975                                 return -EFAULT;
3976                         }
3977                 }
3978
3979                 return res;
3980         case BOND_SLAVE_INFO_QUERY_OLD:
3981         case SIOCBONDSLAVEINFOQUERY:
3982                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3983
3984                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3985                         return -EFAULT;
3986                 }
3987
3988                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3989                 if (res == 0) {
3990                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3991                                 return -EFAULT;
3992                         }
3993                 }
3994
3995                 return res;
3996         default:
3997                 /* Go on */
3998                 break;
3999         }
4000
4001         if (!capable(CAP_NET_ADMIN)) {
4002                 return -EPERM;
4003         }
4004
4005         down_write(&(bonding_rwsem));
4006         slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
4007
4008         pr_debug("slave_dev=%p: \n", slave_dev);
4009
4010         if (!slave_dev) {
4011                 res = -ENODEV;
4012         } else {
4013                 pr_debug("slave_dev->name=%s: \n", slave_dev->name);
4014                 switch (cmd) {
4015                 case BOND_ENSLAVE_OLD:
4016                 case SIOCBONDENSLAVE:
4017                         res = bond_enslave(bond_dev, slave_dev);
4018                         break;
4019                 case BOND_RELEASE_OLD:
4020                 case SIOCBONDRELEASE:
4021                         res = bond_release(bond_dev, slave_dev);
4022                         break;
4023                 case BOND_SETHWADDR_OLD:
4024                 case SIOCBONDSETHWADDR:
4025                         res = bond_sethwaddr(bond_dev, slave_dev);
4026                         break;
4027                 case BOND_CHANGE_ACTIVE_OLD:
4028                 case SIOCBONDCHANGEACTIVE:
4029                         res = bond_ioctl_change_active(bond_dev, slave_dev);
4030                         break;
4031                 default:
4032                         res = -EOPNOTSUPP;
4033                 }
4034
4035                 dev_put(slave_dev);
4036         }
4037
4038         up_write(&(bonding_rwsem));
4039         return res;
4040 }
4041
4042 static void bond_set_multicast_list(struct net_device *bond_dev)
4043 {
4044         struct bonding *bond = netdev_priv(bond_dev);
4045         struct dev_mc_list *dmi;
4046
4047         /*
4048          * Do promisc before checking multicast_mode
4049          */
4050         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
4051                 /*
4052                  * FIXME: Need to handle the error when one of the multi-slaves
4053                  * encounters error.
4054                  */
4055                 bond_set_promiscuity(bond, 1);
4056         }
4057
4058         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
4059                 bond_set_promiscuity(bond, -1);
4060         }
4061
4062         /* set allmulti flag to slaves */
4063         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
4064                 /*
4065                  * FIXME: Need to handle the error when one of the multi-slaves
4066                  * encounters error.
4067                  */
4068                 bond_set_allmulti(bond, 1);
4069         }
4070
4071         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
4072                 bond_set_allmulti(bond, -1);
4073         }
4074
4075         read_lock(&bond->lock);
4076
4077         bond->flags = bond_dev->flags;
4078
4079         /* looking for addresses to add to slaves' mc list */
4080         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
4081                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
4082                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4083                 }
4084         }
4085
4086         /* looking for addresses to delete from slaves' list */
4087         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
4088                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
4089                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4090                 }
4091         }
4092
4093         /* save master's multicast list */
4094         bond_mc_list_destroy(bond);
4095         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
4096
4097         read_unlock(&bond->lock);
4098 }
4099
4100 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
4101 {
4102         struct bonding *bond = netdev_priv(dev);
4103         struct slave *slave = bond->first_slave;
4104
4105         if (slave) {
4106                 const struct net_device_ops *slave_ops
4107                         = slave->dev->netdev_ops;
4108                 if (slave_ops->ndo_neigh_setup)
4109                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
4110         }
4111         return 0;
4112 }
4113
4114 /*
4115  * Change the MTU of all of a master's slaves to match the master
4116  */
4117 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4118 {
4119         struct bonding *bond = netdev_priv(bond_dev);
4120         struct slave *slave, *stop_at;
4121         int res = 0;
4122         int i;
4123
4124         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
4125                 (bond_dev ? bond_dev->name : "None"), new_mtu);
4126
4127         /* Can't hold bond->lock with bh disabled here since
4128          * some base drivers panic. On the other hand we can't
4129          * hold bond->lock without bh disabled because we'll
4130          * deadlock. The only solution is to rely on the fact
4131          * that we're under rtnl_lock here, and the slaves
4132          * list won't change. This doesn't solve the problem
4133          * of setting the slave's MTU while it is
4134          * transmitting, but the assumption is that the base
4135          * driver can handle that.
4136          *
4137          * TODO: figure out a way to safely iterate the slaves
4138          * list, but without holding a lock around the actual
4139          * call to the base driver.
4140          */
4141
4142         bond_for_each_slave(bond, slave, i) {
4143                 pr_debug("s %p s->p %p c_m %p\n", slave,
4144                         slave->prev, slave->dev->netdev_ops->ndo_change_mtu);
4145
4146                 res = dev_set_mtu(slave->dev, new_mtu);
4147
4148                 if (res) {
4149                         /* If we failed to set the slave's mtu to the new value
4150                          * we must abort the operation even in ACTIVE_BACKUP
4151                          * mode, because if we allow the backup slaves to have
4152                          * different mtu values than the active slave we'll
4153                          * need to change their mtu when doing a failover. That
4154                          * means changing their mtu from timer context, which
4155                          * is probably not a good idea.
4156                          */
4157                         pr_debug("err %d %s\n", res, slave->dev->name);
4158                         goto unwind;
4159                 }
4160         }
4161
4162         bond_dev->mtu = new_mtu;
4163
4164         return 0;
4165
4166 unwind:
4167         /* unwind from head to the slave that failed */
4168         stop_at = slave;
4169         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4170                 int tmp_res;
4171
4172                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4173                 if (tmp_res) {
4174                         pr_debug("unwind err %d dev %s\n", tmp_res,
4175                                 slave->dev->name);
4176                 }
4177         }
4178
4179         return res;
4180 }
4181
4182 /*
4183  * Change HW address
4184  *
4185  * Note that many devices must be down to change the HW address, and
4186  * downing the master releases all slaves.  We can make bonds full of
4187  * bonding devices to test this, however.
4188  */
4189 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4190 {
4191         struct bonding *bond = netdev_priv(bond_dev);
4192         struct sockaddr *sa = addr, tmp_sa;
4193         struct slave *slave, *stop_at;
4194         int res = 0;
4195         int i;
4196
4197         if (bond->params.mode == BOND_MODE_ALB)
4198                 return bond_alb_set_mac_address(bond_dev, addr);
4199
4200
4201         pr_debug("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
4202
4203         /*
4204          * If fail_over_mac is set to active, do nothing and return
4205          * success.  Returning an error causes ifenslave to fail.
4206          */
4207         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4208                 return 0;
4209
4210         if (!is_valid_ether_addr(sa->sa_data)) {
4211                 return -EADDRNOTAVAIL;
4212         }
4213
4214         /* Can't hold bond->lock with bh disabled here since
4215          * some base drivers panic. On the other hand we can't
4216          * hold bond->lock without bh disabled because we'll
4217          * deadlock. The only solution is to rely on the fact
4218          * that we're under rtnl_lock here, and the slaves
4219          * list won't change. This doesn't solve the problem
4220          * of setting the slave's hw address while it is
4221          * transmitting, but the assumption is that the base
4222          * driver can handle that.
4223          *
4224          * TODO: figure out a way to safely iterate the slaves
4225          * list, but without holding a lock around the actual
4226          * call to the base driver.
4227          */
4228
4229         bond_for_each_slave(bond, slave, i) {
4230                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4231                 pr_debug("slave %p %s\n", slave, slave->dev->name);
4232
4233                 if (slave_ops->ndo_set_mac_address == NULL) {
4234                         res = -EOPNOTSUPP;
4235                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4236                         goto unwind;
4237                 }
4238
4239                 res = dev_set_mac_address(slave->dev, addr);
4240                 if (res) {
4241                         /* TODO: consider downing the slave
4242                          * and retry ?
4243                          * User should expect communications
4244                          * breakage anyway until ARP finish
4245                          * updating, so...
4246                          */
4247                         pr_debug("err %d %s\n", res, slave->dev->name);
4248                         goto unwind;
4249                 }
4250         }
4251
4252         /* success */
4253         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4254         return 0;
4255
4256 unwind:
4257         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4258         tmp_sa.sa_family = bond_dev->type;
4259
4260         /* unwind from head to the slave that failed */
4261         stop_at = slave;
4262         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4263                 int tmp_res;
4264
4265                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4266                 if (tmp_res) {
4267                         pr_debug("unwind err %d dev %s\n", tmp_res,
4268                                 slave->dev->name);
4269                 }
4270         }
4271
4272         return res;
4273 }
4274
4275 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4276 {
4277         struct bonding *bond = netdev_priv(bond_dev);
4278         struct slave *slave, *start_at;
4279         int i, slave_no, res = 1;
4280
4281         read_lock(&bond->lock);
4282
4283         if (!BOND_IS_OK(bond)) {
4284                 goto out;
4285         }
4286
4287         /*
4288          * Concurrent TX may collide on rr_tx_counter; we accept that
4289          * as being rare enough not to justify using an atomic op here
4290          */
4291         slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4292
4293         bond_for_each_slave(bond, slave, i) {
4294                 slave_no--;
4295                 if (slave_no < 0) {
4296                         break;
4297                 }
4298         }
4299
4300         start_at = slave;
4301         bond_for_each_slave_from(bond, slave, i, start_at) {
4302                 if (IS_UP(slave->dev) &&
4303                     (slave->link == BOND_LINK_UP) &&
4304                     (slave->state == BOND_STATE_ACTIVE)) {
4305                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4306                         break;
4307                 }
4308         }
4309
4310 out:
4311         if (res) {
4312                 /* no suitable interface, frame not sent */
4313                 dev_kfree_skb(skb);
4314         }
4315         read_unlock(&bond->lock);
4316         return 0;
4317 }
4318
4319
4320 /*
4321  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4322  * the bond has a usable interface.
4323  */
4324 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4325 {
4326         struct bonding *bond = netdev_priv(bond_dev);
4327         int res = 1;
4328
4329         read_lock(&bond->lock);
4330         read_lock(&bond->curr_slave_lock);
4331
4332         if (!BOND_IS_OK(bond)) {
4333                 goto out;
4334         }
4335
4336         if (!bond->curr_active_slave)
4337                 goto out;
4338
4339         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4340
4341 out:
4342         if (res) {
4343                 /* no suitable interface, frame not sent */
4344                 dev_kfree_skb(skb);
4345         }
4346         read_unlock(&bond->curr_slave_lock);
4347         read_unlock(&bond->lock);
4348         return 0;
4349 }
4350
4351 /*
4352  * In bond_xmit_xor() , we determine the output device by using a pre-
4353  * determined xmit_hash_policy(), If the selected device is not enabled,
4354  * find the next active slave.
4355  */
4356 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4357 {
4358         struct bonding *bond = netdev_priv(bond_dev);
4359         struct slave *slave, *start_at;
4360         int slave_no;
4361         int i;
4362         int res = 1;
4363
4364         read_lock(&bond->lock);
4365
4366         if (!BOND_IS_OK(bond)) {
4367                 goto out;
4368         }
4369
4370         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4371
4372         bond_for_each_slave(bond, slave, i) {
4373                 slave_no--;
4374                 if (slave_no < 0) {
4375                         break;
4376                 }
4377         }
4378
4379         start_at = slave;
4380
4381         bond_for_each_slave_from(bond, slave, i, start_at) {
4382                 if (IS_UP(slave->dev) &&
4383                     (slave->link == BOND_LINK_UP) &&
4384                     (slave->state == BOND_STATE_ACTIVE)) {
4385                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4386                         break;
4387                 }
4388         }
4389
4390 out:
4391         if (res) {
4392                 /* no suitable interface, frame not sent */
4393                 dev_kfree_skb(skb);
4394         }
4395         read_unlock(&bond->lock);
4396         return 0;
4397 }
4398
4399 /*
4400  * in broadcast mode, we send everything to all usable interfaces.
4401  */
4402 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4403 {
4404         struct bonding *bond = netdev_priv(bond_dev);
4405         struct slave *slave, *start_at;
4406         struct net_device *tx_dev = NULL;
4407         int i;
4408         int res = 1;
4409
4410         read_lock(&bond->lock);
4411
4412         if (!BOND_IS_OK(bond)) {
4413                 goto out;
4414         }
4415
4416         read_lock(&bond->curr_slave_lock);
4417         start_at = bond->curr_active_slave;
4418         read_unlock(&bond->curr_slave_lock);
4419
4420         if (!start_at) {
4421                 goto out;
4422         }
4423
4424         bond_for_each_slave_from(bond, slave, i, start_at) {
4425                 if (IS_UP(slave->dev) &&
4426                     (slave->link == BOND_LINK_UP) &&
4427                     (slave->state == BOND_STATE_ACTIVE)) {
4428                         if (tx_dev) {
4429                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4430                                 if (!skb2) {
4431                                         printk(KERN_ERR DRV_NAME
4432                                                ": %s: Error: bond_xmit_broadcast(): "
4433                                                "skb_clone() failed\n",
4434                                                bond_dev->name);
4435                                         continue;
4436                                 }
4437
4438                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4439                                 if (res) {
4440                                         dev_kfree_skb(skb2);
4441                                         continue;
4442                                 }
4443                         }
4444                         tx_dev = slave->dev;
4445                 }
4446         }
4447
4448         if (tx_dev) {
4449                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4450         }
4451
4452 out:
4453         if (res) {
4454                 /* no suitable interface, frame not sent */
4455                 dev_kfree_skb(skb);
4456         }
4457         /* frame sent to all suitable interfaces */
4458         read_unlock(&bond->lock);
4459         return 0;
4460 }
4461
4462 /*------------------------- Device initialization ---------------------------*/
4463
4464 static void bond_set_xmit_hash_policy(struct bonding *bond)
4465 {
4466         switch (bond->params.xmit_policy) {
4467         case BOND_XMIT_POLICY_LAYER23:
4468                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4469                 break;
4470         case BOND_XMIT_POLICY_LAYER34:
4471                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4472                 break;
4473         case BOND_XMIT_POLICY_LAYER2:
4474         default:
4475                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4476                 break;
4477         }
4478 }
4479
4480 static int bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4481 {
4482         const struct bonding *bond = netdev_priv(dev);
4483
4484         switch (bond->params.mode) {
4485         case BOND_MODE_ROUNDROBIN:
4486                 return bond_xmit_roundrobin(skb, dev);
4487         case BOND_MODE_ACTIVEBACKUP:
4488                 return bond_xmit_activebackup(skb, dev);
4489         case BOND_MODE_XOR:
4490                 return bond_xmit_xor(skb, dev);
4491         case BOND_MODE_BROADCAST:
4492                 return bond_xmit_broadcast(skb, dev);
4493         case BOND_MODE_8023AD:
4494                 return bond_3ad_xmit_xor(skb, dev);
4495         case BOND_MODE_ALB:
4496         case BOND_MODE_TLB:
4497                 return bond_alb_xmit(skb, dev);
4498         default:
4499                 /* Should never happen, mode already checked */
4500                 printk(KERN_ERR DRV_NAME ": %s: Error: Unknown bonding mode %d\n",
4501                      dev->name, bond->params.mode);
4502                 WARN_ON_ONCE(1);
4503                 dev_kfree_skb(skb);
4504                 return NETDEV_TX_OK;
4505         }
4506 }
4507
4508
4509 /*
4510  * set bond mode specific net device operations
4511  */
4512 void bond_set_mode_ops(struct bonding *bond, int mode)
4513 {
4514         struct net_device *bond_dev = bond->dev;
4515
4516         switch (mode) {
4517         case BOND_MODE_ROUNDROBIN:
4518                 break;
4519         case BOND_MODE_ACTIVEBACKUP:
4520                 break;
4521         case BOND_MODE_XOR:
4522                 bond_set_xmit_hash_policy(bond);
4523                 break;
4524         case BOND_MODE_BROADCAST:
4525                 break;
4526         case BOND_MODE_8023AD:
4527                 bond_set_master_3ad_flags(bond);
4528                 bond_set_xmit_hash_policy(bond);
4529                 break;
4530         case BOND_MODE_ALB:
4531                 bond_set_master_alb_flags(bond);
4532                 /* FALLTHRU */
4533         case BOND_MODE_TLB:
4534                 break;
4535         default:
4536                 /* Should never happen, mode already checked */
4537                 printk(KERN_ERR DRV_NAME
4538                        ": %s: Error: Unknown bonding mode %d\n",
4539                        bond_dev->name,
4540                        mode);
4541                 break;
4542         }
4543 }
4544
4545 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4546                                     struct ethtool_drvinfo *drvinfo)
4547 {
4548         strncpy(drvinfo->driver, DRV_NAME, 32);
4549         strncpy(drvinfo->version, DRV_VERSION, 32);
4550         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4551 }
4552
4553 static const struct ethtool_ops bond_ethtool_ops = {
4554         .get_drvinfo            = bond_ethtool_get_drvinfo,
4555         .get_link               = ethtool_op_get_link,
4556         .get_tx_csum            = ethtool_op_get_tx_csum,
4557         .get_sg                 = ethtool_op_get_sg,
4558         .get_tso                = ethtool_op_get_tso,
4559         .get_ufo                = ethtool_op_get_ufo,
4560         .get_flags              = ethtool_op_get_flags,
4561 };
4562
4563 static const struct net_device_ops bond_netdev_ops = {
4564         .ndo_open               = bond_open,
4565         .ndo_stop               = bond_close,
4566         .ndo_start_xmit         = bond_start_xmit,
4567         .ndo_get_stats          = bond_get_stats,
4568         .ndo_do_ioctl           = bond_do_ioctl,
4569         .ndo_set_multicast_list = bond_set_multicast_list,
4570         .ndo_change_mtu         = bond_change_mtu,
4571         .ndo_set_mac_address    = bond_set_mac_address,
4572         .ndo_neigh_setup        = bond_neigh_setup,
4573         .ndo_vlan_rx_register   = bond_vlan_rx_register,
4574         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4575         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4576 };
4577
4578 /*
4579  * Does not allocate but creates a /proc entry.
4580  * Allowed to fail.
4581  */
4582 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4583 {
4584         struct bonding *bond = netdev_priv(bond_dev);
4585
4586         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4587
4588         /* initialize rwlocks */
4589         rwlock_init(&bond->lock);
4590         rwlock_init(&bond->curr_slave_lock);
4591
4592         bond->params = *params; /* copy params struct */
4593
4594         bond->wq = create_singlethread_workqueue(bond_dev->name);
4595         if (!bond->wq)
4596                 return -ENOMEM;
4597
4598         /* Initialize pointers */
4599         bond->first_slave = NULL;
4600         bond->curr_active_slave = NULL;
4601         bond->current_arp_slave = NULL;
4602         bond->primary_slave = NULL;
4603         bond->dev = bond_dev;
4604         bond->send_grat_arp = 0;
4605         bond->send_unsol_na = 0;
4606         bond->setup_by_slave = 0;
4607         INIT_LIST_HEAD(&bond->vlan_list);
4608
4609         /* Initialize the device entry points */
4610         bond_dev->netdev_ops = &bond_netdev_ops;
4611         bond_dev->ethtool_ops = &bond_ethtool_ops;
4612         bond_set_mode_ops(bond, bond->params.mode);
4613
4614         bond_dev->destructor = bond_destructor;
4615
4616         /* Initialize the device options */
4617         bond_dev->tx_queue_len = 0;
4618         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4619         bond_dev->priv_flags |= IFF_BONDING;
4620         if (bond->params.arp_interval)
4621                 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4622
4623         /* At first, we block adding VLANs. That's the only way to
4624          * prevent problems that occur when adding VLANs over an
4625          * empty bond. The block will be removed once non-challenged
4626          * slaves are enslaved.
4627          */
4628         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4629
4630         /* don't acquire bond device's netif_tx_lock when
4631          * transmitting */
4632         bond_dev->features |= NETIF_F_LLTX;
4633
4634         /* By default, we declare the bond to be fully
4635          * VLAN hardware accelerated capable. Special
4636          * care is taken in the various xmit functions
4637          * when there are slaves that are not hw accel
4638          * capable
4639          */
4640         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4641                                NETIF_F_HW_VLAN_RX |
4642                                NETIF_F_HW_VLAN_FILTER);
4643
4644 #ifdef CONFIG_PROC_FS
4645         bond_create_proc_entry(bond);
4646 #endif
4647         list_add_tail(&bond->bond_list, &bond_dev_list);
4648
4649         return 0;
4650 }
4651
4652 static void bond_work_cancel_all(struct bonding *bond)
4653 {
4654         write_lock_bh(&bond->lock);
4655         bond->kill_timers = 1;
4656         write_unlock_bh(&bond->lock);
4657
4658         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4659                 cancel_delayed_work(&bond->mii_work);
4660
4661         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4662                 cancel_delayed_work(&bond->arp_work);
4663
4664         if (bond->params.mode == BOND_MODE_ALB &&
4665             delayed_work_pending(&bond->alb_work))
4666                 cancel_delayed_work(&bond->alb_work);
4667
4668         if (bond->params.mode == BOND_MODE_8023AD &&
4669             delayed_work_pending(&bond->ad_work))
4670                 cancel_delayed_work(&bond->ad_work);
4671 }
4672
4673 /* De-initialize device specific data.
4674  * Caller must hold rtnl_lock.
4675  */
4676 static void bond_deinit(struct net_device *bond_dev)
4677 {
4678         struct bonding *bond = netdev_priv(bond_dev);
4679
4680         list_del(&bond->bond_list);
4681
4682         bond_work_cancel_all(bond);
4683
4684 #ifdef CONFIG_PROC_FS
4685         bond_remove_proc_entry(bond);
4686 #endif
4687 }
4688
4689 /* Unregister and free all bond devices.
4690  * Caller must hold rtnl_lock.
4691  */
4692 static void bond_free_all(void)
4693 {
4694         struct bonding *bond, *nxt;
4695
4696         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4697                 struct net_device *bond_dev = bond->dev;
4698
4699                 bond_work_cancel_all(bond);
4700                 /* Release the bonded slaves */
4701                 bond_release_all(bond_dev);
4702                 bond_destroy(bond);
4703         }
4704
4705 #ifdef CONFIG_PROC_FS
4706         bond_destroy_proc_dir();
4707 #endif
4708 }
4709
4710 /*------------------------- Module initialization ---------------------------*/
4711
4712 /*
4713  * Convert string input module parms.  Accept either the
4714  * number of the mode or its string name.  A bit complicated because
4715  * some mode names are substrings of other names, and calls from sysfs
4716  * may have whitespace in the name (trailing newlines, for example).
4717  */
4718 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4719 {
4720         int modeint = -1, i, rv;
4721         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4722
4723         for (p = (char *)buf; *p; p++)
4724                 if (!(isdigit(*p) || isspace(*p)))
4725                         break;
4726
4727         if (*p)
4728                 rv = sscanf(buf, "%20s", modestr);
4729         else
4730                 rv = sscanf(buf, "%d", &modeint);
4731
4732         if (!rv)
4733                 return -1;
4734
4735         for (i = 0; tbl[i].modename; i++) {
4736                 if (modeint == tbl[i].mode)
4737                         return tbl[i].mode;
4738                 if (strcmp(modestr, tbl[i].modename) == 0)
4739                         return tbl[i].mode;
4740         }
4741
4742         return -1;
4743 }
4744
4745 static int bond_check_params(struct bond_params *params)
4746 {
4747         int arp_validate_value, fail_over_mac_value;
4748
4749         /*
4750          * Convert string parameters.
4751          */
4752         if (mode) {
4753                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4754                 if (bond_mode == -1) {
4755                         printk(KERN_ERR DRV_NAME
4756                                ": Error: Invalid bonding mode \"%s\"\n",
4757                                mode == NULL ? "NULL" : mode);
4758                         return -EINVAL;
4759                 }
4760         }
4761
4762         if (xmit_hash_policy) {
4763                 if ((bond_mode != BOND_MODE_XOR) &&
4764                     (bond_mode != BOND_MODE_8023AD)) {
4765                         printk(KERN_INFO DRV_NAME
4766                                ": xor_mode param is irrelevant in mode %s\n",
4767                                bond_mode_name(bond_mode));
4768                 } else {
4769                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4770                                                         xmit_hashtype_tbl);
4771                         if (xmit_hashtype == -1) {
4772                                 printk(KERN_ERR DRV_NAME
4773                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4774                                 xmit_hash_policy == NULL ? "NULL" :
4775                                        xmit_hash_policy);
4776                                 return -EINVAL;
4777                         }
4778                 }
4779         }
4780
4781         if (lacp_rate) {
4782                 if (bond_mode != BOND_MODE_8023AD) {
4783                         printk(KERN_INFO DRV_NAME
4784                                ": lacp_rate param is irrelevant in mode %s\n",
4785                                bond_mode_name(bond_mode));
4786                 } else {
4787                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4788                         if (lacp_fast == -1) {
4789                                 printk(KERN_ERR DRV_NAME
4790                                        ": Error: Invalid lacp rate \"%s\"\n",
4791                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4792                                 return -EINVAL;
4793                         }
4794                 }
4795         }
4796
4797         if (ad_select) {
4798                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4799                 if (params->ad_select == -1) {
4800                         printk(KERN_ERR DRV_NAME
4801                                ": Error: Invalid ad_select \"%s\"\n",
4802                                ad_select == NULL ? "NULL" : ad_select);
4803                         return -EINVAL;
4804                 }
4805
4806                 if (bond_mode != BOND_MODE_8023AD) {
4807                         printk(KERN_WARNING DRV_NAME
4808                                ": ad_select param only affects 802.3ad mode\n");
4809                 }
4810         } else {
4811                 params->ad_select = BOND_AD_STABLE;
4812         }
4813
4814         if (max_bonds < 0 || max_bonds > INT_MAX) {
4815                 printk(KERN_WARNING DRV_NAME
4816                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4817                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4818                        max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4819                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4820         }
4821
4822         if (miimon < 0) {
4823                 printk(KERN_WARNING DRV_NAME
4824                        ": Warning: miimon module parameter (%d), "
4825                        "not in range 0-%d, so it was reset to %d\n",
4826                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4827                 miimon = BOND_LINK_MON_INTERV;
4828         }
4829
4830         if (updelay < 0) {
4831                 printk(KERN_WARNING DRV_NAME
4832                        ": Warning: updelay module parameter (%d), "
4833                        "not in range 0-%d, so it was reset to 0\n",
4834                        updelay, INT_MAX);
4835                 updelay = 0;
4836         }
4837
4838         if (downdelay < 0) {
4839                 printk(KERN_WARNING DRV_NAME
4840                        ": Warning: downdelay module parameter (%d), "
4841                        "not in range 0-%d, so it was reset to 0\n",
4842                        downdelay, INT_MAX);
4843                 downdelay = 0;
4844         }
4845
4846         if ((use_carrier != 0) && (use_carrier != 1)) {
4847                 printk(KERN_WARNING DRV_NAME
4848                        ": Warning: use_carrier module parameter (%d), "
4849                        "not of valid value (0/1), so it was set to 1\n",
4850                        use_carrier);
4851                 use_carrier = 1;
4852         }
4853
4854         if (num_grat_arp < 0 || num_grat_arp > 255) {
4855                 printk(KERN_WARNING DRV_NAME
4856                        ": Warning: num_grat_arp (%d) not in range 0-255 so it "
4857                        "was reset to 1 \n", num_grat_arp);
4858                 num_grat_arp = 1;
4859         }
4860
4861         if (num_unsol_na < 0 || num_unsol_na > 255) {
4862                 printk(KERN_WARNING DRV_NAME
4863                        ": Warning: num_unsol_na (%d) not in range 0-255 so it "
4864                        "was reset to 1 \n", num_unsol_na);
4865                 num_unsol_na = 1;
4866         }
4867
4868         /* reset values for 802.3ad */
4869         if (bond_mode == BOND_MODE_8023AD) {
4870                 if (!miimon) {
4871                         printk(KERN_WARNING DRV_NAME
4872                                ": Warning: miimon must be specified, "
4873                                "otherwise bonding will not detect link "
4874                                "failure, speed and duplex which are "
4875                                "essential for 802.3ad operation\n");
4876                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4877                         miimon = 100;
4878                 }
4879         }
4880
4881         /* reset values for TLB/ALB */
4882         if ((bond_mode == BOND_MODE_TLB) ||
4883             (bond_mode == BOND_MODE_ALB)) {
4884                 if (!miimon) {
4885                         printk(KERN_WARNING DRV_NAME
4886                                ": Warning: miimon must be specified, "
4887                                "otherwise bonding will not detect link "
4888                                "failure and link speed which are essential "
4889                                "for TLB/ALB load balancing\n");
4890                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4891                         miimon = 100;
4892                 }
4893         }
4894
4895         if (bond_mode == BOND_MODE_ALB) {
4896                 printk(KERN_NOTICE DRV_NAME
4897                        ": In ALB mode you might experience client "
4898                        "disconnections upon reconnection of a link if the "
4899                        "bonding module updelay parameter (%d msec) is "
4900                        "incompatible with the forwarding delay time of the "
4901                        "switch\n",
4902                        updelay);
4903         }
4904
4905         if (!miimon) {
4906                 if (updelay || downdelay) {
4907                         /* just warn the user the up/down delay will have
4908                          * no effect since miimon is zero...
4909                          */
4910                         printk(KERN_WARNING DRV_NAME
4911                                ": Warning: miimon module parameter not set "
4912                                "and updelay (%d) or downdelay (%d) module "
4913                                "parameter is set; updelay and downdelay have "
4914                                "no effect unless miimon is set\n",
4915                                updelay, downdelay);
4916                 }
4917         } else {
4918                 /* don't allow arp monitoring */
4919                 if (arp_interval) {
4920                         printk(KERN_WARNING DRV_NAME
4921                                ": Warning: miimon (%d) and arp_interval (%d) "
4922                                "can't be used simultaneously, disabling ARP "
4923                                "monitoring\n",
4924                                miimon, arp_interval);
4925                         arp_interval = 0;
4926                 }
4927
4928                 if ((updelay % miimon) != 0) {
4929                         printk(KERN_WARNING DRV_NAME
4930                                ": Warning: updelay (%d) is not a multiple "
4931                                "of miimon (%d), updelay rounded to %d ms\n",
4932                                updelay, miimon, (updelay / miimon) * miimon);
4933                 }
4934
4935                 updelay /= miimon;
4936
4937                 if ((downdelay % miimon) != 0) {
4938                         printk(KERN_WARNING DRV_NAME
4939                                ": Warning: downdelay (%d) is not a multiple "
4940                                "of miimon (%d), downdelay rounded to %d ms\n",
4941                                downdelay, miimon,
4942                                (downdelay / miimon) * miimon);
4943                 }
4944
4945                 downdelay /= miimon;
4946         }
4947
4948         if (arp_interval < 0) {
4949                 printk(KERN_WARNING DRV_NAME
4950                        ": Warning: arp_interval module parameter (%d) "
4951                        ", not in range 0-%d, so it was reset to %d\n",
4952                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4953                 arp_interval = BOND_LINK_ARP_INTERV;
4954         }
4955
4956         for (arp_ip_count = 0;
4957              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4958              arp_ip_count++) {
4959                 /* not complete check, but should be good enough to
4960                    catch mistakes */
4961                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4962                         printk(KERN_WARNING DRV_NAME
4963                                ": Warning: bad arp_ip_target module parameter "
4964                                "(%s), ARP monitoring will not be performed\n",
4965                                arp_ip_target[arp_ip_count]);
4966                         arp_interval = 0;
4967                 } else {
4968                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4969                         arp_target[arp_ip_count] = ip;
4970                 }
4971         }
4972
4973         if (arp_interval && !arp_ip_count) {
4974                 /* don't allow arping if no arp_ip_target given... */
4975                 printk(KERN_WARNING DRV_NAME
4976                        ": Warning: arp_interval module parameter (%d) "
4977                        "specified without providing an arp_ip_target "
4978                        "parameter, arp_interval was reset to 0\n",
4979                        arp_interval);
4980                 arp_interval = 0;
4981         }
4982
4983         if (arp_validate) {
4984                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4985                         printk(KERN_ERR DRV_NAME
4986                ": arp_validate only supported in active-backup mode\n");
4987                         return -EINVAL;
4988                 }
4989                 if (!arp_interval) {
4990                         printk(KERN_ERR DRV_NAME
4991                                ": arp_validate requires arp_interval\n");
4992                         return -EINVAL;
4993                 }
4994
4995                 arp_validate_value = bond_parse_parm(arp_validate,
4996                                                      arp_validate_tbl);
4997                 if (arp_validate_value == -1) {
4998                         printk(KERN_ERR DRV_NAME
4999                                ": Error: invalid arp_validate \"%s\"\n",
5000                                arp_validate == NULL ? "NULL" : arp_validate);
5001                         return -EINVAL;
5002                 }
5003         } else
5004                 arp_validate_value = 0;
5005
5006         if (miimon) {
5007                 printk(KERN_INFO DRV_NAME
5008                        ": MII link monitoring set to %d ms\n",
5009                        miimon);
5010         } else if (arp_interval) {
5011                 int i;
5012
5013                 printk(KERN_INFO DRV_NAME
5014                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
5015                        arp_interval,
5016                        arp_validate_tbl[arp_validate_value].modename,
5017                        arp_ip_count);
5018
5019                 for (i = 0; i < arp_ip_count; i++)
5020                         printk (" %s", arp_ip_target[i]);
5021
5022                 printk("\n");
5023
5024         } else if (max_bonds) {
5025                 /* miimon and arp_interval not set, we need one so things
5026                  * work as expected, see bonding.txt for details
5027                  */
5028                 printk(KERN_WARNING DRV_NAME
5029                        ": Warning: either miimon or arp_interval and "
5030                        "arp_ip_target module parameters must be specified, "
5031                        "otherwise bonding will not detect link failures! see "
5032                        "bonding.txt for details.\n");
5033         }
5034
5035         if (primary && !USES_PRIMARY(bond_mode)) {
5036                 /* currently, using a primary only makes sense
5037                  * in active backup, TLB or ALB modes
5038                  */
5039                 printk(KERN_WARNING DRV_NAME
5040                        ": Warning: %s primary device specified but has no "
5041                        "effect in %s mode\n",
5042                        primary, bond_mode_name(bond_mode));
5043                 primary = NULL;
5044         }
5045
5046         if (fail_over_mac) {
5047                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
5048                                                       fail_over_mac_tbl);
5049                 if (fail_over_mac_value == -1) {
5050                         printk(KERN_ERR DRV_NAME
5051                                ": Error: invalid fail_over_mac \"%s\"\n",
5052                                arp_validate == NULL ? "NULL" : arp_validate);
5053                         return -EINVAL;
5054                 }
5055
5056                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5057                         printk(KERN_WARNING DRV_NAME
5058                                ": Warning: fail_over_mac only affects "
5059                                "active-backup mode.\n");
5060         } else {
5061                 fail_over_mac_value = BOND_FOM_NONE;
5062         }
5063
5064         /* fill params struct with the proper values */
5065         params->mode = bond_mode;
5066         params->xmit_policy = xmit_hashtype;
5067         params->miimon = miimon;
5068         params->num_grat_arp = num_grat_arp;
5069         params->num_unsol_na = num_unsol_na;
5070         params->arp_interval = arp_interval;
5071         params->arp_validate = arp_validate_value;
5072         params->updelay = updelay;
5073         params->downdelay = downdelay;
5074         params->use_carrier = use_carrier;
5075         params->lacp_fast = lacp_fast;
5076         params->primary[0] = 0;
5077         params->fail_over_mac = fail_over_mac_value;
5078
5079         if (primary) {
5080                 strncpy(params->primary, primary, IFNAMSIZ);
5081                 params->primary[IFNAMSIZ - 1] = 0;
5082         }
5083
5084         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5085
5086         return 0;
5087 }
5088
5089 static struct lock_class_key bonding_netdev_xmit_lock_key;
5090 static struct lock_class_key bonding_netdev_addr_lock_key;
5091
5092 static void bond_set_lockdep_class_one(struct net_device *dev,
5093                                        struct netdev_queue *txq,
5094                                        void *_unused)
5095 {
5096         lockdep_set_class(&txq->_xmit_lock,
5097                           &bonding_netdev_xmit_lock_key);
5098 }
5099
5100 static void bond_set_lockdep_class(struct net_device *dev)
5101 {
5102         lockdep_set_class(&dev->addr_list_lock,
5103                           &bonding_netdev_addr_lock_key);
5104         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
5105 }
5106
5107 /* Create a new bond based on the specified name and bonding parameters.
5108  * If name is NULL, obtain a suitable "bond%d" name for us.
5109  * Caller must NOT hold rtnl_lock; we need to release it here before we
5110  * set up our sysfs entries.
5111  */
5112 int bond_create(char *name, struct bond_params *params)
5113 {
5114         struct net_device *bond_dev;
5115         struct bonding *bond;
5116         int res;
5117
5118         rtnl_lock();
5119         down_write(&bonding_rwsem);
5120
5121         /* Check to see if the bond already exists. */
5122         if (name) {
5123                 list_for_each_entry(bond, &bond_dev_list, bond_list)
5124                         if (strnicmp(bond->dev->name, name, IFNAMSIZ) == 0) {
5125                                 printk(KERN_ERR DRV_NAME
5126                                ": cannot add bond %s; it already exists\n",
5127                                        name);
5128                                 res = -EPERM;
5129                                 goto out_rtnl;
5130                         }
5131         }
5132
5133         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
5134                                 ether_setup);
5135         if (!bond_dev) {
5136                 printk(KERN_ERR DRV_NAME
5137                        ": %s: eek! can't alloc netdev!\n",
5138                        name);
5139                 res = -ENOMEM;
5140                 goto out_rtnl;
5141         }
5142
5143         if (!name) {
5144                 res = dev_alloc_name(bond_dev, "bond%d");
5145                 if (res < 0)
5146                         goto out_netdev;
5147         }
5148
5149         /* bond_init() must be called after dev_alloc_name() (for the
5150          * /proc files), but before register_netdevice(), because we
5151          * need to set function pointers.
5152          */
5153
5154         res = bond_init(bond_dev, params);
5155         if (res < 0) {
5156                 goto out_netdev;
5157         }
5158
5159         res = register_netdevice(bond_dev);
5160         if (res < 0) {
5161                 goto out_bond;
5162         }
5163
5164         bond_set_lockdep_class(bond_dev);
5165
5166         netif_carrier_off(bond_dev);
5167
5168         up_write(&bonding_rwsem);
5169         rtnl_unlock(); /* allows sysfs registration of net device */
5170         res = bond_create_sysfs_entry(netdev_priv(bond_dev));
5171         if (res < 0) {
5172                 rtnl_lock();
5173                 down_write(&bonding_rwsem);
5174                 bond_deinit(bond_dev);
5175                 unregister_netdevice(bond_dev);
5176                 goto out_rtnl;
5177         }
5178
5179         return 0;
5180
5181 out_bond:
5182         bond_deinit(bond_dev);
5183 out_netdev:
5184         free_netdev(bond_dev);
5185 out_rtnl:
5186         up_write(&bonding_rwsem);
5187         rtnl_unlock();
5188         return res;
5189 }
5190
5191 static int __init bonding_init(void)
5192 {
5193         int i;
5194         int res;
5195         struct bonding *bond;
5196
5197         printk(KERN_INFO "%s", version);
5198
5199         res = bond_check_params(&bonding_defaults);
5200         if (res) {
5201                 goto out;
5202         }
5203
5204 #ifdef CONFIG_PROC_FS
5205         bond_create_proc_dir();
5206 #endif
5207
5208         init_rwsem(&bonding_rwsem);
5209
5210         for (i = 0; i < max_bonds; i++) {
5211                 res = bond_create(NULL, &bonding_defaults);
5212                 if (res)
5213                         goto err;
5214         }
5215
5216         res = bond_create_sysfs();
5217         if (res)
5218                 goto err;
5219
5220         register_netdevice_notifier(&bond_netdev_notifier);
5221         register_inetaddr_notifier(&bond_inetaddr_notifier);
5222         bond_register_ipv6_notifier();
5223
5224         goto out;
5225 err:
5226         list_for_each_entry(bond, &bond_dev_list, bond_list) {
5227                 bond_work_cancel_all(bond);
5228                 destroy_workqueue(bond->wq);
5229         }
5230
5231         bond_destroy_sysfs();
5232
5233         rtnl_lock();
5234         bond_free_all();
5235         rtnl_unlock();
5236 out:
5237         return res;
5238
5239 }
5240
5241 static void __exit bonding_exit(void)
5242 {
5243         unregister_netdevice_notifier(&bond_netdev_notifier);
5244         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5245         bond_unregister_ipv6_notifier();
5246
5247         bond_destroy_sysfs();
5248
5249         rtnl_lock();
5250         bond_free_all();
5251         rtnl_unlock();
5252 }
5253
5254 module_init(bonding_init);
5255 module_exit(bonding_exit);
5256 MODULE_LICENSE("GPL");
5257 MODULE_VERSION(DRV_VERSION);
5258 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5259 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5260 MODULE_SUPPORTED_DEVICE("most ethernet devices");
5261
5262 /*
5263  * Local variables:
5264  *  c-indent-level: 8
5265  *  c-basic-offset: 8
5266  *  tab-width: 8
5267  * End:
5268  */
5269