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 {
1006         u8 tmp_mac[ETH_ALEN];
1007         struct sockaddr saddr;
1008         int rv;
1009
1010         switch (bond->params.fail_over_mac) {
1011         case BOND_FOM_ACTIVE:
1012                 if (new_active)
1013                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
1014                                new_active->dev->addr_len);
1015                 break;
1016         case BOND_FOM_FOLLOW:
1017                 /*
1018                  * if new_active && old_active, swap them
1019                  * if just old_active, do nothing (going to no active slave)
1020                  * if just new_active, set new_active to bond's MAC
1021                  */
1022                 if (!new_active)
1023                         return;
1024
1025                 write_unlock_bh(&bond->curr_slave_lock);
1026                 read_unlock(&bond->lock);
1027
1028                 if (old_active) {
1029                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1030                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
1031                                ETH_ALEN);
1032                         saddr.sa_family = new_active->dev->type;
1033                 } else {
1034                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1035                         saddr.sa_family = bond->dev->type;
1036                 }
1037
1038                 rv = dev_set_mac_address(new_active->dev, &saddr);
1039                 if (rv) {
1040                         printk(KERN_ERR DRV_NAME
1041                                ": %s: Error %d setting MAC of slave %s\n",
1042                                bond->dev->name, -rv, new_active->dev->name);
1043                         goto out;
1044                 }
1045
1046                 if (!old_active)
1047                         goto out;
1048
1049                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1050                 saddr.sa_family = old_active->dev->type;
1051
1052                 rv = dev_set_mac_address(old_active->dev, &saddr);
1053                 if (rv)
1054                         printk(KERN_ERR DRV_NAME
1055                                ": %s: Error %d setting MAC of slave %s\n",
1056                                bond->dev->name, -rv, new_active->dev->name);
1057 out:
1058                 read_lock(&bond->lock);
1059                 write_lock_bh(&bond->curr_slave_lock);
1060                 break;
1061         default:
1062                 printk(KERN_ERR DRV_NAME
1063                        ": %s: bond_do_fail_over_mac impossible: bad policy %d\n",
1064                        bond->dev->name, bond->params.fail_over_mac);
1065                 break;
1066         }
1067
1068 }
1069
1070
1071 /**
1072  * find_best_interface - select the best available slave to be the active one
1073  * @bond: our bonding struct
1074  *
1075  * Warning: Caller must hold curr_slave_lock for writing.
1076  */
1077 static struct slave *bond_find_best_slave(struct bonding *bond)
1078 {
1079         struct slave *new_active, *old_active;
1080         struct slave *bestslave = NULL;
1081         int mintime = bond->params.updelay;
1082         int i;
1083
1084         new_active = old_active = bond->curr_active_slave;
1085
1086         if (!new_active) { /* there were no active slaves left */
1087                 if (bond->slave_cnt > 0) {  /* found one slave */
1088                         new_active = bond->first_slave;
1089                 } else {
1090                         return NULL; /* still no slave, return NULL */
1091                 }
1092         }
1093
1094         /* first try the primary link; if arping, a link must tx/rx traffic
1095          * before it can be considered the curr_active_slave - also, we would skip
1096          * slaves between the curr_active_slave and primary_slave that may be up
1097          * and able to arp
1098          */
1099         if ((bond->primary_slave) &&
1100             (!bond->params.arp_interval) &&
1101             (IS_UP(bond->primary_slave->dev))) {
1102                 new_active = bond->primary_slave;
1103         }
1104
1105         /* remember where to stop iterating over the slaves */
1106         old_active = new_active;
1107
1108         bond_for_each_slave_from(bond, new_active, i, old_active) {
1109                 if (IS_UP(new_active->dev)) {
1110                         if (new_active->link == BOND_LINK_UP) {
1111                                 return new_active;
1112                         } else if (new_active->link == BOND_LINK_BACK) {
1113                                 /* link up, but waiting for stabilization */
1114                                 if (new_active->delay < mintime) {
1115                                         mintime = new_active->delay;
1116                                         bestslave = new_active;
1117                                 }
1118                         }
1119                 }
1120         }
1121
1122         return bestslave;
1123 }
1124
1125 /**
1126  * change_active_interface - change the active slave into the specified one
1127  * @bond: our bonding struct
1128  * @new: the new slave to make the active one
1129  *
1130  * Set the new slave to the bond's settings and unset them on the old
1131  * curr_active_slave.
1132  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1133  *
1134  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1135  * because it is apparently the best available slave we have, even though its
1136  * updelay hasn't timed out yet.
1137  *
1138  * If new_active is not NULL, caller must hold bond->lock for read and
1139  * curr_slave_lock for write_bh.
1140  */
1141 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1142 {
1143         struct slave *old_active = bond->curr_active_slave;
1144
1145         if (old_active == new_active) {
1146                 return;
1147         }
1148
1149         if (new_active) {
1150                 new_active->jiffies = jiffies;
1151
1152                 if (new_active->link == BOND_LINK_BACK) {
1153                         if (USES_PRIMARY(bond->params.mode)) {
1154                                 printk(KERN_INFO DRV_NAME
1155                                        ": %s: making interface %s the new "
1156                                        "active one %d ms earlier.\n",
1157                                        bond->dev->name, new_active->dev->name,
1158                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1159                         }
1160
1161                         new_active->delay = 0;
1162                         new_active->link = BOND_LINK_UP;
1163
1164                         if (bond->params.mode == BOND_MODE_8023AD) {
1165                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1166                         }
1167
1168                         if (bond_is_lb(bond))
1169                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1170                 } else {
1171                         if (USES_PRIMARY(bond->params.mode)) {
1172                                 printk(KERN_INFO DRV_NAME
1173                                        ": %s: making interface %s the new "
1174                                        "active one.\n",
1175                                        bond->dev->name, new_active->dev->name);
1176                         }
1177                 }
1178         }
1179
1180         if (USES_PRIMARY(bond->params.mode)) {
1181                 bond_mc_swap(bond, new_active, old_active);
1182         }
1183
1184         if (bond_is_lb(bond)) {
1185                 bond_alb_handle_active_change(bond, new_active);
1186                 if (old_active)
1187                         bond_set_slave_inactive_flags(old_active);
1188                 if (new_active)
1189                         bond_set_slave_active_flags(new_active);
1190         } else {
1191                 bond->curr_active_slave = new_active;
1192         }
1193
1194         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1195                 if (old_active) {
1196                         bond_set_slave_inactive_flags(old_active);
1197                 }
1198
1199                 if (new_active) {
1200                         bond_set_slave_active_flags(new_active);
1201
1202                         if (bond->params.fail_over_mac)
1203                                 bond_do_fail_over_mac(bond, new_active,
1204                                                       old_active);
1205
1206                         bond->send_grat_arp = bond->params.num_grat_arp;
1207                         bond_send_gratuitous_arp(bond);
1208
1209                         bond->send_unsol_na = bond->params.num_unsol_na;
1210                         bond_send_unsolicited_na(bond);
1211
1212                         write_unlock_bh(&bond->curr_slave_lock);
1213                         read_unlock(&bond->lock);
1214
1215                         netdev_bonding_change(bond->dev);
1216
1217                         read_lock(&bond->lock);
1218                         write_lock_bh(&bond->curr_slave_lock);
1219                 }
1220         }
1221 }
1222
1223 /**
1224  * bond_select_active_slave - select a new active slave, if needed
1225  * @bond: our bonding struct
1226  *
1227  * This functions shoud be called when one of the following occurs:
1228  * - The old curr_active_slave has been released or lost its link.
1229  * - The primary_slave has got its link back.
1230  * - A slave has got its link back and there's no old curr_active_slave.
1231  *
1232  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1233  */
1234 void bond_select_active_slave(struct bonding *bond)
1235 {
1236         struct slave *best_slave;
1237         int rv;
1238
1239         best_slave = bond_find_best_slave(bond);
1240         if (best_slave != bond->curr_active_slave) {
1241                 bond_change_active_slave(bond, best_slave);
1242                 rv = bond_set_carrier(bond);
1243                 if (!rv)
1244                         return;
1245
1246                 if (netif_carrier_ok(bond->dev)) {
1247                         printk(KERN_INFO DRV_NAME
1248                                ": %s: first active interface up!\n",
1249                                bond->dev->name);
1250                 } else {
1251                         printk(KERN_INFO DRV_NAME ": %s: "
1252                                "now running without any active interface !\n",
1253                                bond->dev->name);
1254                 }
1255         }
1256 }
1257
1258 /*--------------------------- slave list handling ---------------------------*/
1259
1260 /*
1261  * This function attaches the slave to the end of list.
1262  *
1263  * bond->lock held for writing by caller.
1264  */
1265 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1266 {
1267         if (bond->first_slave == NULL) { /* attaching the first slave */
1268                 new_slave->next = new_slave;
1269                 new_slave->prev = new_slave;
1270                 bond->first_slave = new_slave;
1271         } else {
1272                 new_slave->next = bond->first_slave;
1273                 new_slave->prev = bond->first_slave->prev;
1274                 new_slave->next->prev = new_slave;
1275                 new_slave->prev->next = new_slave;
1276         }
1277
1278         bond->slave_cnt++;
1279 }
1280
1281 /*
1282  * This function detaches the slave from the list.
1283  * WARNING: no check is made to verify if the slave effectively
1284  * belongs to <bond>.
1285  * Nothing is freed on return, structures are just unchained.
1286  * If any slave pointer in bond was pointing to <slave>,
1287  * it should be changed by the calling function.
1288  *
1289  * bond->lock held for writing by caller.
1290  */
1291 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1292 {
1293         if (slave->next) {
1294                 slave->next->prev = slave->prev;
1295         }
1296
1297         if (slave->prev) {
1298                 slave->prev->next = slave->next;
1299         }
1300
1301         if (bond->first_slave == slave) { /* slave is the first slave */
1302                 if (bond->slave_cnt > 1) { /* there are more slave */
1303                         bond->first_slave = slave->next;
1304                 } else {
1305                         bond->first_slave = NULL; /* slave was the last one */
1306                 }
1307         }
1308
1309         slave->next = NULL;
1310         slave->prev = NULL;
1311         bond->slave_cnt--;
1312 }
1313
1314 /*---------------------------------- IOCTL ----------------------------------*/
1315
1316 static int bond_sethwaddr(struct net_device *bond_dev,
1317                           struct net_device *slave_dev)
1318 {
1319         pr_debug("bond_dev=%p\n", bond_dev);
1320         pr_debug("slave_dev=%p\n", slave_dev);
1321         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1322         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1323         return 0;
1324 }
1325
1326 #define BOND_VLAN_FEATURES \
1327         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1328          NETIF_F_HW_VLAN_FILTER)
1329
1330 /*
1331  * Compute the common dev->feature set available to all slaves.  Some
1332  * feature bits are managed elsewhere, so preserve those feature bits
1333  * on the master device.
1334  */
1335 static int bond_compute_features(struct bonding *bond)
1336 {
1337         struct slave *slave;
1338         struct net_device *bond_dev = bond->dev;
1339         unsigned long features = bond_dev->features;
1340         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1341                                                 bond_dev->hard_header_len);
1342         int i;
1343
1344         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1345         features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1346
1347         if (!bond->first_slave)
1348                 goto done;
1349
1350         features &= ~NETIF_F_ONE_FOR_ALL;
1351
1352         bond_for_each_slave(bond, slave, i) {
1353                 features = netdev_increment_features(features,
1354                                                      slave->dev->features,
1355                                                      NETIF_F_ONE_FOR_ALL);
1356                 if (slave->dev->hard_header_len > max_hard_header_len)
1357                         max_hard_header_len = slave->dev->hard_header_len;
1358         }
1359
1360 done:
1361         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1362         bond_dev->features = netdev_fix_features(features, NULL);
1363         bond_dev->hard_header_len = max_hard_header_len;
1364
1365         return 0;
1366 }
1367
1368 static void bond_setup_by_slave(struct net_device *bond_dev,
1369                                 struct net_device *slave_dev)
1370 {
1371         struct bonding *bond = netdev_priv(bond_dev);
1372
1373         bond_dev->header_ops        = slave_dev->header_ops;
1374
1375         bond_dev->type              = slave_dev->type;
1376         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1377         bond_dev->addr_len          = slave_dev->addr_len;
1378
1379         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1380                 slave_dev->addr_len);
1381         bond->setup_by_slave = 1;
1382 }
1383
1384 /* enslave device <slave> to bond device <master> */
1385 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1386 {
1387         struct bonding *bond = netdev_priv(bond_dev);
1388         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1389         struct slave *new_slave = NULL;
1390         struct dev_mc_list *dmi;
1391         struct sockaddr addr;
1392         int link_reporting;
1393         int old_features = bond_dev->features;
1394         int res = 0;
1395
1396         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1397                 slave_ops->ndo_do_ioctl == NULL) {
1398                 printk(KERN_WARNING DRV_NAME
1399                        ": %s: Warning: no link monitoring support for %s\n",
1400                        bond_dev->name, slave_dev->name);
1401         }
1402
1403         /* bond must be initialized by bond_open() before enslaving */
1404         if (!(bond_dev->flags & IFF_UP)) {
1405                 printk(KERN_WARNING DRV_NAME
1406                         " %s: master_dev is not up in bond_enslave\n",
1407                         bond_dev->name);
1408         }
1409
1410         /* already enslaved */
1411         if (slave_dev->flags & IFF_SLAVE) {
1412                 pr_debug("Error, Device was already enslaved\n");
1413                 return -EBUSY;
1414         }
1415
1416         /* vlan challenged mutual exclusion */
1417         /* no need to lock since we're protected by rtnl_lock */
1418         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1419                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1420                 if (!list_empty(&bond->vlan_list)) {
1421                         printk(KERN_ERR DRV_NAME
1422                                ": %s: Error: cannot enslave VLAN "
1423                                "challenged slave %s on VLAN enabled "
1424                                "bond %s\n", bond_dev->name, slave_dev->name,
1425                                bond_dev->name);
1426                         return -EPERM;
1427                 } else {
1428                         printk(KERN_WARNING DRV_NAME
1429                                ": %s: Warning: enslaved VLAN challenged "
1430                                "slave %s. Adding VLANs will be blocked as "
1431                                "long as %s is part of bond %s\n",
1432                                bond_dev->name, slave_dev->name, slave_dev->name,
1433                                bond_dev->name);
1434                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1435                 }
1436         } else {
1437                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1438                 if (bond->slave_cnt == 0) {
1439                         /* First slave, and it is not VLAN challenged,
1440                          * so remove the block of adding VLANs over the bond.
1441                          */
1442                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1443                 }
1444         }
1445
1446         /*
1447          * Old ifenslave binaries are no longer supported.  These can
1448          * be identified with moderate accurary by the state of the slave:
1449          * the current ifenslave will set the interface down prior to
1450          * enslaving it; the old ifenslave will not.
1451          */
1452         if ((slave_dev->flags & IFF_UP)) {
1453                 printk(KERN_ERR DRV_NAME ": %s is up. "
1454                        "This may be due to an out of date ifenslave.\n",
1455                        slave_dev->name);
1456                 res = -EPERM;
1457                 goto err_undo_flags;
1458         }
1459
1460         /* set bonding device ether type by slave - bonding netdevices are
1461          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1462          * there is a need to override some of the type dependent attribs/funcs.
1463          *
1464          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1465          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1466          */
1467         if (bond->slave_cnt == 0) {
1468                 if (slave_dev->type != ARPHRD_ETHER)
1469                         bond_setup_by_slave(bond_dev, slave_dev);
1470         } else if (bond_dev->type != slave_dev->type) {
1471                 printk(KERN_ERR DRV_NAME ": %s ether type (%d) is different "
1472                         "from other slaves (%d), can not enslave it.\n",
1473                         slave_dev->name,
1474                         slave_dev->type, bond_dev->type);
1475                         res = -EINVAL;
1476                         goto err_undo_flags;
1477         }
1478
1479         if (slave_ops->ndo_set_mac_address == NULL) {
1480                 if (bond->slave_cnt == 0) {
1481                         printk(KERN_WARNING DRV_NAME
1482                                ": %s: Warning: The first slave device "
1483                                "specified does not support setting the MAC "
1484                                "address. Setting fail_over_mac to active.",
1485                                bond_dev->name);
1486                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1487                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1488                         printk(KERN_ERR DRV_NAME
1489                                 ": %s: Error: The slave device specified "
1490                                 "does not support setting the MAC address, "
1491                                 "but fail_over_mac is not set to active.\n"
1492                                 , bond_dev->name);
1493                         res = -EOPNOTSUPP;
1494                         goto err_undo_flags;
1495                 }
1496         }
1497
1498         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1499         if (!new_slave) {
1500                 res = -ENOMEM;
1501                 goto err_undo_flags;
1502         }
1503
1504         /* save slave's original flags before calling
1505          * netdev_set_master and dev_open
1506          */
1507         new_slave->original_flags = slave_dev->flags;
1508
1509         /*
1510          * Save slave's original ("permanent") mac address for modes
1511          * that need it, and for restoring it upon release, and then
1512          * set it to the master's address
1513          */
1514         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1515
1516         if (!bond->params.fail_over_mac) {
1517                 /*
1518                  * Set slave to master's mac address.  The application already
1519                  * set the master's mac address to that of the first slave
1520                  */
1521                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1522                 addr.sa_family = slave_dev->type;
1523                 res = dev_set_mac_address(slave_dev, &addr);
1524                 if (res) {
1525                         pr_debug("Error %d calling set_mac_address\n", res);
1526                         goto err_free;
1527                 }
1528         }
1529
1530         res = netdev_set_master(slave_dev, bond_dev);
1531         if (res) {
1532                 pr_debug("Error %d calling netdev_set_master\n", res);
1533                 goto err_restore_mac;
1534         }
1535         /* open the slave since the application closed it */
1536         res = dev_open(slave_dev);
1537         if (res) {
1538                 pr_debug("Openning slave %s failed\n", slave_dev->name);
1539                 goto err_unset_master;
1540         }
1541
1542         new_slave->dev = slave_dev;
1543         slave_dev->priv_flags |= IFF_BONDING;
1544
1545         if (bond_is_lb(bond)) {
1546                 /* bond_alb_init_slave() must be called before all other stages since
1547                  * it might fail and we do not want to have to undo everything
1548                  */
1549                 res = bond_alb_init_slave(bond, new_slave);
1550                 if (res) {
1551                         goto err_close;
1552                 }
1553         }
1554
1555         /* If the mode USES_PRIMARY, then the new slave gets the
1556          * master's promisc (and mc) settings only if it becomes the
1557          * curr_active_slave, and that is taken care of later when calling
1558          * bond_change_active()
1559          */
1560         if (!USES_PRIMARY(bond->params.mode)) {
1561                 /* set promiscuity level to new slave */
1562                 if (bond_dev->flags & IFF_PROMISC) {
1563                         res = dev_set_promiscuity(slave_dev, 1);
1564                         if (res)
1565                                 goto err_close;
1566                 }
1567
1568                 /* set allmulti level to new slave */
1569                 if (bond_dev->flags & IFF_ALLMULTI) {
1570                         res = dev_set_allmulti(slave_dev, 1);
1571                         if (res)
1572                                 goto err_close;
1573                 }
1574
1575                 netif_addr_lock_bh(bond_dev);
1576                 /* upload master's mc_list to new slave */
1577                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1578                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1579                 }
1580                 netif_addr_unlock_bh(bond_dev);
1581         }
1582
1583         if (bond->params.mode == BOND_MODE_8023AD) {
1584                 /* add lacpdu mc addr to mc list */
1585                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1586
1587                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1588         }
1589
1590         bond_add_vlans_on_slave(bond, slave_dev);
1591
1592         write_lock_bh(&bond->lock);
1593
1594         bond_attach_slave(bond, new_slave);
1595
1596         new_slave->delay = 0;
1597         new_slave->link_failure_count = 0;
1598
1599         bond_compute_features(bond);
1600
1601         write_unlock_bh(&bond->lock);
1602
1603         read_lock(&bond->lock);
1604
1605         new_slave->last_arp_rx = jiffies;
1606
1607         if (bond->params.miimon && !bond->params.use_carrier) {
1608                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1609
1610                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1611                         /*
1612                          * miimon is set but a bonded network driver
1613                          * does not support ETHTOOL/MII and
1614                          * arp_interval is not set.  Note: if
1615                          * use_carrier is enabled, we will never go
1616                          * here (because netif_carrier is always
1617                          * supported); thus, we don't need to change
1618                          * the messages for netif_carrier.
1619                          */
1620                         printk(KERN_WARNING DRV_NAME
1621                                ": %s: Warning: MII and ETHTOOL support not "
1622                                "available for interface %s, and "
1623                                "arp_interval/arp_ip_target module parameters "
1624                                "not specified, thus bonding will not detect "
1625                                "link failures! see bonding.txt for details.\n",
1626                                bond_dev->name, slave_dev->name);
1627                 } else if (link_reporting == -1) {
1628                         /* unable get link status using mii/ethtool */
1629                         printk(KERN_WARNING DRV_NAME
1630                                ": %s: Warning: can't get link status from "
1631                                "interface %s; the network driver associated "
1632                                "with this interface does not support MII or "
1633                                "ETHTOOL link status reporting, thus miimon "
1634                                "has no effect on this interface.\n",
1635                                bond_dev->name, slave_dev->name);
1636                 }
1637         }
1638
1639         /* check for initial state */
1640         if (!bond->params.miimon ||
1641             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1642                 if (bond->params.updelay) {
1643                         pr_debug("Initial state of slave_dev is "
1644                                 "BOND_LINK_BACK\n");
1645                         new_slave->link  = BOND_LINK_BACK;
1646                         new_slave->delay = bond->params.updelay;
1647                 } else {
1648                         pr_debug("Initial state of slave_dev is "
1649                                 "BOND_LINK_UP\n");
1650                         new_slave->link  = BOND_LINK_UP;
1651                 }
1652                 new_slave->jiffies = jiffies;
1653         } else {
1654                 pr_debug("Initial state of slave_dev is "
1655                         "BOND_LINK_DOWN\n");
1656                 new_slave->link  = BOND_LINK_DOWN;
1657         }
1658
1659         if (bond_update_speed_duplex(new_slave) &&
1660             (new_slave->link != BOND_LINK_DOWN)) {
1661                 printk(KERN_WARNING DRV_NAME
1662                        ": %s: Warning: failed to get speed and duplex from %s, "
1663                        "assumed to be 100Mb/sec and Full.\n",
1664                        bond_dev->name, new_slave->dev->name);
1665
1666                 if (bond->params.mode == BOND_MODE_8023AD) {
1667                         printk(KERN_WARNING DRV_NAME
1668                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1669                                "support in base driver for proper aggregator "
1670                                "selection.\n", bond_dev->name);
1671                 }
1672         }
1673
1674         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1675                 /* if there is a primary slave, remember it */
1676                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1677                         bond->primary_slave = new_slave;
1678                 }
1679         }
1680
1681         write_lock_bh(&bond->curr_slave_lock);
1682
1683         switch (bond->params.mode) {
1684         case BOND_MODE_ACTIVEBACKUP:
1685                 bond_set_slave_inactive_flags(new_slave);
1686                 bond_select_active_slave(bond);
1687                 break;
1688         case BOND_MODE_8023AD:
1689                 /* in 802.3ad mode, the internal mechanism
1690                  * will activate the slaves in the selected
1691                  * aggregator
1692                  */
1693                 bond_set_slave_inactive_flags(new_slave);
1694                 /* if this is the first slave */
1695                 if (bond->slave_cnt == 1) {
1696                         SLAVE_AD_INFO(new_slave).id = 1;
1697                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1698                          * can be called only after the mac address of the bond is set
1699                          */
1700                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1701                                             bond->params.lacp_fast);
1702                 } else {
1703                         SLAVE_AD_INFO(new_slave).id =
1704                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1705                 }
1706
1707                 bond_3ad_bind_slave(new_slave);
1708                 break;
1709         case BOND_MODE_TLB:
1710         case BOND_MODE_ALB:
1711                 new_slave->state = BOND_STATE_ACTIVE;
1712                 bond_set_slave_inactive_flags(new_slave);
1713                 break;
1714         default:
1715                 pr_debug("This slave is always active in trunk mode\n");
1716
1717                 /* always active in trunk mode */
1718                 new_slave->state = BOND_STATE_ACTIVE;
1719
1720                 /* In trunking mode there is little meaning to curr_active_slave
1721                  * anyway (it holds no special properties of the bond device),
1722                  * so we can change it without calling change_active_interface()
1723                  */
1724                 if (!bond->curr_active_slave) {
1725                         bond->curr_active_slave = new_slave;
1726                 }
1727                 break;
1728         } /* switch(bond_mode) */
1729
1730         write_unlock_bh(&bond->curr_slave_lock);
1731
1732         bond_set_carrier(bond);
1733
1734         read_unlock(&bond->lock);
1735
1736         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1737         if (res)
1738                 goto err_close;
1739
1740         printk(KERN_INFO DRV_NAME
1741                ": %s: enslaving %s as a%s interface with a%s link.\n",
1742                bond_dev->name, slave_dev->name,
1743                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1744                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1745
1746         /* enslave is successful */
1747         return 0;
1748
1749 /* Undo stages on error */
1750 err_close:
1751         dev_close(slave_dev);
1752
1753 err_unset_master:
1754         netdev_set_master(slave_dev, NULL);
1755
1756 err_restore_mac:
1757         if (!bond->params.fail_over_mac) {
1758                 /* XXX TODO - fom follow mode needs to change master's
1759                  * MAC if this slave's MAC is in use by the bond, or at
1760                  * least print a warning.
1761                  */
1762                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1763                 addr.sa_family = slave_dev->type;
1764                 dev_set_mac_address(slave_dev, &addr);
1765         }
1766
1767 err_free:
1768         kfree(new_slave);
1769
1770 err_undo_flags:
1771         bond_dev->features = old_features;
1772
1773         return res;
1774 }
1775
1776 /*
1777  * Try to release the slave device <slave> from the bond device <master>
1778  * It is legal to access curr_active_slave without a lock because all the function
1779  * is write-locked.
1780  *
1781  * The rules for slave state should be:
1782  *   for Active/Backup:
1783  *     Active stays on all backups go down
1784  *   for Bonded connections:
1785  *     The first up interface should be left on and all others downed.
1786  */
1787 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1788 {
1789         struct bonding *bond = netdev_priv(bond_dev);
1790         struct slave *slave, *oldcurrent;
1791         struct sockaddr addr;
1792         int mac_addr_differ;
1793
1794         /* slave is not a slave or master is not master of this slave */
1795         if (!(slave_dev->flags & IFF_SLAVE) ||
1796             (slave_dev->master != bond_dev)) {
1797                 printk(KERN_ERR DRV_NAME
1798                        ": %s: Error: cannot release %s.\n",
1799                        bond_dev->name, slave_dev->name);
1800                 return -EINVAL;
1801         }
1802
1803         write_lock_bh(&bond->lock);
1804
1805         slave = bond_get_slave_by_dev(bond, slave_dev);
1806         if (!slave) {
1807                 /* not a slave of this bond */
1808                 printk(KERN_INFO DRV_NAME
1809                        ": %s: %s not enslaved\n",
1810                        bond_dev->name, slave_dev->name);
1811                 write_unlock_bh(&bond->lock);
1812                 return -EINVAL;
1813         }
1814
1815         if (!bond->params.fail_over_mac) {
1816                 mac_addr_differ = memcmp(bond_dev->dev_addr, slave->perm_hwaddr,
1817                                          ETH_ALEN);
1818                 if (!mac_addr_differ && (bond->slave_cnt > 1))
1819                         printk(KERN_WARNING DRV_NAME
1820                                ": %s: Warning: the permanent HWaddr of %s - "
1821                                "%pM - is still in use by %s. "
1822                                "Set the HWaddr of %s to a different address "
1823                                "to avoid conflicts.\n",
1824                                bond_dev->name, slave_dev->name,
1825                                slave->perm_hwaddr,
1826                                bond_dev->name, slave_dev->name);
1827         }
1828
1829         /* Inform AD package of unbinding of slave. */
1830         if (bond->params.mode == BOND_MODE_8023AD) {
1831                 /* must be called before the slave is
1832                  * detached from the list
1833                  */
1834                 bond_3ad_unbind_slave(slave);
1835         }
1836
1837         printk(KERN_INFO DRV_NAME
1838                ": %s: releasing %s interface %s\n",
1839                bond_dev->name,
1840                (slave->state == BOND_STATE_ACTIVE)
1841                ? "active" : "backup",
1842                slave_dev->name);
1843
1844         oldcurrent = bond->curr_active_slave;
1845
1846         bond->current_arp_slave = NULL;
1847
1848         /* release the slave from its bond */
1849         bond_detach_slave(bond, slave);
1850
1851         bond_compute_features(bond);
1852
1853         if (bond->primary_slave == slave) {
1854                 bond->primary_slave = NULL;
1855         }
1856
1857         if (oldcurrent == slave) {
1858                 bond_change_active_slave(bond, NULL);
1859         }
1860
1861         if (bond_is_lb(bond)) {
1862                 /* Must be called only after the slave has been
1863                  * detached from the list and the curr_active_slave
1864                  * has been cleared (if our_slave == old_current),
1865                  * but before a new active slave is selected.
1866                  */
1867                 write_unlock_bh(&bond->lock);
1868                 bond_alb_deinit_slave(bond, slave);
1869                 write_lock_bh(&bond->lock);
1870         }
1871
1872         if (oldcurrent == slave) {
1873                 /*
1874                  * Note that we hold RTNL over this sequence, so there
1875                  * is no concern that another slave add/remove event
1876                  * will interfere.
1877                  */
1878                 write_unlock_bh(&bond->lock);
1879                 read_lock(&bond->lock);
1880                 write_lock_bh(&bond->curr_slave_lock);
1881
1882                 bond_select_active_slave(bond);
1883
1884                 write_unlock_bh(&bond->curr_slave_lock);
1885                 read_unlock(&bond->lock);
1886                 write_lock_bh(&bond->lock);
1887         }
1888
1889         if (bond->slave_cnt == 0) {
1890                 bond_set_carrier(bond);
1891
1892                 /* if the last slave was removed, zero the mac address
1893                  * of the master so it will be set by the application
1894                  * to the mac address of the first slave
1895                  */
1896                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1897
1898                 if (list_empty(&bond->vlan_list)) {
1899                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1900                 } else {
1901                         printk(KERN_WARNING DRV_NAME
1902                                ": %s: Warning: clearing HW address of %s while it "
1903                                "still has VLANs.\n",
1904                                bond_dev->name, bond_dev->name);
1905                         printk(KERN_WARNING DRV_NAME
1906                                ": %s: When re-adding slaves, make sure the bond's "
1907                                "HW address matches its VLANs'.\n",
1908                                bond_dev->name);
1909                 }
1910         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1911                    !bond_has_challenged_slaves(bond)) {
1912                 printk(KERN_INFO DRV_NAME
1913                        ": %s: last VLAN challenged slave %s "
1914                        "left bond %s. VLAN blocking is removed\n",
1915                        bond_dev->name, slave_dev->name, bond_dev->name);
1916                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1917         }
1918
1919         write_unlock_bh(&bond->lock);
1920
1921         /* must do this from outside any spinlocks */
1922         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1923
1924         bond_del_vlans_from_slave(bond, slave_dev);
1925
1926         /* If the mode USES_PRIMARY, then we should only remove its
1927          * promisc and mc settings if it was the curr_active_slave, but that was
1928          * already taken care of above when we detached the slave
1929          */
1930         if (!USES_PRIMARY(bond->params.mode)) {
1931                 /* unset promiscuity level from slave */
1932                 if (bond_dev->flags & IFF_PROMISC) {
1933                         dev_set_promiscuity(slave_dev, -1);
1934                 }
1935
1936                 /* unset allmulti level from slave */
1937                 if (bond_dev->flags & IFF_ALLMULTI) {
1938                         dev_set_allmulti(slave_dev, -1);
1939                 }
1940
1941                 /* flush master's mc_list from slave */
1942                 netif_addr_lock_bh(bond_dev);
1943                 bond_mc_list_flush(bond_dev, slave_dev);
1944                 netif_addr_unlock_bh(bond_dev);
1945         }
1946
1947         netdev_set_master(slave_dev, NULL);
1948
1949         /* close slave before restoring its mac address */
1950         dev_close(slave_dev);
1951
1952         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1953                 /* restore original ("permanent") mac address */
1954                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1955                 addr.sa_family = slave_dev->type;
1956                 dev_set_mac_address(slave_dev, &addr);
1957         }
1958
1959         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1960                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1961                                    IFF_SLAVE_NEEDARP);
1962
1963         kfree(slave);
1964
1965         return 0;  /* deletion OK */
1966 }
1967
1968 /*
1969 * Destroy a bonding device.
1970 * Must be under rtnl_lock when this function is called.
1971 */
1972 void bond_destroy(struct bonding *bond)
1973 {
1974         bond_deinit(bond->dev);
1975         bond_destroy_sysfs_entry(bond);
1976         unregister_netdevice(bond->dev);
1977 }
1978
1979 static void bond_destructor(struct net_device *bond_dev)
1980 {
1981         struct bonding *bond = netdev_priv(bond_dev);
1982
1983         if (bond->wq)
1984                 destroy_workqueue(bond->wq);
1985
1986         netif_addr_lock_bh(bond_dev);
1987         bond_mc_list_destroy(bond);
1988         netif_addr_unlock_bh(bond_dev);
1989
1990         free_netdev(bond_dev);
1991 }
1992
1993 /*
1994 * First release a slave and than destroy the bond if no more slaves iare left.
1995 * Must be under rtnl_lock when this function is called.
1996 */
1997 int  bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev)
1998 {
1999         struct bonding *bond = netdev_priv(bond_dev);
2000         int ret;
2001
2002         ret = bond_release(bond_dev, slave_dev);
2003         if ((ret == 0) && (bond->slave_cnt == 0)) {
2004                 printk(KERN_INFO DRV_NAME ": %s: destroying bond %s.\n",
2005                        bond_dev->name, bond_dev->name);
2006                 bond_destroy(bond);
2007         }
2008         return ret;
2009 }
2010
2011 /*
2012  * This function releases all slaves.
2013  */
2014 static int bond_release_all(struct net_device *bond_dev)
2015 {
2016         struct bonding *bond = netdev_priv(bond_dev);
2017         struct slave *slave;
2018         struct net_device *slave_dev;
2019         struct sockaddr addr;
2020
2021         write_lock_bh(&bond->lock);
2022
2023         netif_carrier_off(bond_dev);
2024
2025         if (bond->slave_cnt == 0) {
2026                 goto out;
2027         }
2028
2029         bond->current_arp_slave = NULL;
2030         bond->primary_slave = NULL;
2031         bond_change_active_slave(bond, NULL);
2032
2033         while ((slave = bond->first_slave) != NULL) {
2034                 /* Inform AD package of unbinding of slave
2035                  * before slave is detached from the list.
2036                  */
2037                 if (bond->params.mode == BOND_MODE_8023AD) {
2038                         bond_3ad_unbind_slave(slave);
2039                 }
2040
2041                 slave_dev = slave->dev;
2042                 bond_detach_slave(bond, slave);
2043
2044                 /* now that the slave is detached, unlock and perform
2045                  * all the undo steps that should not be called from
2046                  * within a lock.
2047                  */
2048                 write_unlock_bh(&bond->lock);
2049
2050                 if (bond_is_lb(bond)) {
2051                         /* must be called only after the slave
2052                          * has been detached from the list
2053                          */
2054                         bond_alb_deinit_slave(bond, slave);
2055                 }
2056
2057                 bond_compute_features(bond);
2058
2059                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2060                 bond_del_vlans_from_slave(bond, slave_dev);
2061
2062                 /* If the mode USES_PRIMARY, then we should only remove its
2063                  * promisc and mc settings if it was the curr_active_slave, but that was
2064                  * already taken care of above when we detached the slave
2065                  */
2066                 if (!USES_PRIMARY(bond->params.mode)) {
2067                         /* unset promiscuity level from slave */
2068                         if (bond_dev->flags & IFF_PROMISC) {
2069                                 dev_set_promiscuity(slave_dev, -1);
2070                         }
2071
2072                         /* unset allmulti level from slave */
2073                         if (bond_dev->flags & IFF_ALLMULTI) {
2074                                 dev_set_allmulti(slave_dev, -1);
2075                         }
2076
2077                         /* flush master's mc_list from slave */
2078                         netif_addr_lock_bh(bond_dev);
2079                         bond_mc_list_flush(bond_dev, slave_dev);
2080                         netif_addr_unlock_bh(bond_dev);
2081                 }
2082
2083                 netdev_set_master(slave_dev, NULL);
2084
2085                 /* close slave before restoring its mac address */
2086                 dev_close(slave_dev);
2087
2088                 if (!bond->params.fail_over_mac) {
2089                         /* restore original ("permanent") mac address*/
2090                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2091                         addr.sa_family = slave_dev->type;
2092                         dev_set_mac_address(slave_dev, &addr);
2093                 }
2094
2095                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2096                                            IFF_SLAVE_INACTIVE);
2097
2098                 kfree(slave);
2099
2100                 /* re-acquire the lock before getting the next slave */
2101                 write_lock_bh(&bond->lock);
2102         }
2103
2104         /* zero the mac address of the master so it will be
2105          * set by the application to the mac address of the
2106          * first slave
2107          */
2108         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2109
2110         if (list_empty(&bond->vlan_list)) {
2111                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2112         } else {
2113                 printk(KERN_WARNING DRV_NAME
2114                        ": %s: Warning: clearing HW address of %s while it "
2115                        "still has VLANs.\n",
2116                        bond_dev->name, bond_dev->name);
2117                 printk(KERN_WARNING DRV_NAME
2118                        ": %s: When re-adding slaves, make sure the bond's "
2119                        "HW address matches its VLANs'.\n",
2120                        bond_dev->name);
2121         }
2122
2123         printk(KERN_INFO DRV_NAME
2124                ": %s: released all slaves\n",
2125                bond_dev->name);
2126
2127 out:
2128         write_unlock_bh(&bond->lock);
2129
2130         return 0;
2131 }
2132
2133 /*
2134  * This function changes the active slave to slave <slave_dev>.
2135  * It returns -EINVAL in the following cases.
2136  *  - <slave_dev> is not found in the list.
2137  *  - There is not active slave now.
2138  *  - <slave_dev> is already active.
2139  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2140  *  - <slave_dev> is not running.
2141  * In these cases, this fuction does nothing.
2142  * In the other cases, currnt_slave pointer is changed and 0 is returned.
2143  */
2144 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2145 {
2146         struct bonding *bond = netdev_priv(bond_dev);
2147         struct slave *old_active = NULL;
2148         struct slave *new_active = NULL;
2149         int res = 0;
2150
2151         if (!USES_PRIMARY(bond->params.mode)) {
2152                 return -EINVAL;
2153         }
2154
2155         /* Verify that master_dev is indeed the master of slave_dev */
2156         if (!(slave_dev->flags & IFF_SLAVE) ||
2157             (slave_dev->master != bond_dev)) {
2158                 return -EINVAL;
2159         }
2160
2161         read_lock(&bond->lock);
2162
2163         read_lock(&bond->curr_slave_lock);
2164         old_active = bond->curr_active_slave;
2165         read_unlock(&bond->curr_slave_lock);
2166
2167         new_active = bond_get_slave_by_dev(bond, slave_dev);
2168
2169         /*
2170          * Changing to the current active: do nothing; return success.
2171          */
2172         if (new_active && (new_active == old_active)) {
2173                 read_unlock(&bond->lock);
2174                 return 0;
2175         }
2176
2177         if ((new_active) &&
2178             (old_active) &&
2179             (new_active->link == BOND_LINK_UP) &&
2180             IS_UP(new_active->dev)) {
2181                 write_lock_bh(&bond->curr_slave_lock);
2182                 bond_change_active_slave(bond, new_active);
2183                 write_unlock_bh(&bond->curr_slave_lock);
2184         } else {
2185                 res = -EINVAL;
2186         }
2187
2188         read_unlock(&bond->lock);
2189
2190         return res;
2191 }
2192
2193 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2194 {
2195         struct bonding *bond = netdev_priv(bond_dev);
2196
2197         info->bond_mode = bond->params.mode;
2198         info->miimon = bond->params.miimon;
2199
2200         read_lock(&bond->lock);
2201         info->num_slaves = bond->slave_cnt;
2202         read_unlock(&bond->lock);
2203
2204         return 0;
2205 }
2206
2207 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2208 {
2209         struct bonding *bond = netdev_priv(bond_dev);
2210         struct slave *slave;
2211         int i, found = 0;
2212
2213         if (info->slave_id < 0) {
2214                 return -ENODEV;
2215         }
2216
2217         read_lock(&bond->lock);
2218
2219         bond_for_each_slave(bond, slave, i) {
2220                 if (i == (int)info->slave_id) {
2221                         found = 1;
2222                         break;
2223                 }
2224         }
2225
2226         read_unlock(&bond->lock);
2227
2228         if (found) {
2229                 strcpy(info->slave_name, slave->dev->name);
2230                 info->link = slave->link;
2231                 info->state = slave->state;
2232                 info->link_failure_count = slave->link_failure_count;
2233         } else {
2234                 return -ENODEV;
2235         }
2236
2237         return 0;
2238 }
2239
2240 /*-------------------------------- Monitoring -------------------------------*/
2241
2242
2243 static int bond_miimon_inspect(struct bonding *bond)
2244 {
2245         struct slave *slave;
2246         int i, link_state, commit = 0;
2247
2248         bond_for_each_slave(bond, slave, i) {
2249                 slave->new_link = BOND_LINK_NOCHANGE;
2250
2251                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2252
2253                 switch (slave->link) {
2254                 case BOND_LINK_UP:
2255                         if (link_state)
2256                                 continue;
2257
2258                         slave->link = BOND_LINK_FAIL;
2259                         slave->delay = bond->params.downdelay;
2260                         if (slave->delay) {
2261                                 printk(KERN_INFO DRV_NAME
2262                                        ": %s: link status down for %s"
2263                                        "interface %s, disabling it in %d ms.\n",
2264                                        bond->dev->name,
2265                                        (bond->params.mode ==
2266                                         BOND_MODE_ACTIVEBACKUP) ?
2267                                        ((slave->state == BOND_STATE_ACTIVE) ?
2268                                         "active " : "backup ") : "",
2269                                        slave->dev->name,
2270                                        bond->params.downdelay * bond->params.miimon);
2271                         }
2272                         /*FALLTHRU*/
2273                 case BOND_LINK_FAIL:
2274                         if (link_state) {
2275                                 /*
2276                                  * recovered before downdelay expired
2277                                  */
2278                                 slave->link = BOND_LINK_UP;
2279                                 slave->jiffies = jiffies;
2280                                 printk(KERN_INFO DRV_NAME
2281                                        ": %s: link status up again after %d "
2282                                        "ms for interface %s.\n",
2283                                        bond->dev->name,
2284                                        (bond->params.downdelay - slave->delay) *
2285                                        bond->params.miimon,
2286                                        slave->dev->name);
2287                                 continue;
2288                         }
2289
2290                         if (slave->delay <= 0) {
2291                                 slave->new_link = BOND_LINK_DOWN;
2292                                 commit++;
2293                                 continue;
2294                         }
2295
2296                         slave->delay--;
2297                         break;
2298
2299                 case BOND_LINK_DOWN:
2300                         if (!link_state)
2301                                 continue;
2302
2303                         slave->link = BOND_LINK_BACK;
2304                         slave->delay = bond->params.updelay;
2305
2306                         if (slave->delay) {
2307                                 printk(KERN_INFO DRV_NAME
2308                                        ": %s: link status up for "
2309                                        "interface %s, enabling it in %d ms.\n",
2310                                        bond->dev->name, slave->dev->name,
2311                                        bond->params.updelay *
2312                                        bond->params.miimon);
2313                         }
2314                         /*FALLTHRU*/
2315                 case BOND_LINK_BACK:
2316                         if (!link_state) {
2317                                 slave->link = BOND_LINK_DOWN;
2318                                 printk(KERN_INFO DRV_NAME
2319                                        ": %s: link status down again after %d "
2320                                        "ms for interface %s.\n",
2321                                        bond->dev->name,
2322                                        (bond->params.updelay - slave->delay) *
2323                                        bond->params.miimon,
2324                                        slave->dev->name);
2325
2326                                 continue;
2327                         }
2328
2329                         if (slave->delay <= 0) {
2330                                 slave->new_link = BOND_LINK_UP;
2331                                 commit++;
2332                                 continue;
2333                         }
2334
2335                         slave->delay--;
2336                         break;
2337                 }
2338         }
2339
2340         return commit;
2341 }
2342
2343 static void bond_miimon_commit(struct bonding *bond)
2344 {
2345         struct slave *slave;
2346         int i;
2347
2348         bond_for_each_slave(bond, slave, i) {
2349                 switch (slave->new_link) {
2350                 case BOND_LINK_NOCHANGE:
2351                         continue;
2352
2353                 case BOND_LINK_UP:
2354                         slave->link = BOND_LINK_UP;
2355                         slave->jiffies = jiffies;
2356
2357                         if (bond->params.mode == BOND_MODE_8023AD) {
2358                                 /* prevent it from being the active one */
2359                                 slave->state = BOND_STATE_BACKUP;
2360                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2361                                 /* make it immediately active */
2362                                 slave->state = BOND_STATE_ACTIVE;
2363                         } else if (slave != bond->primary_slave) {
2364                                 /* prevent it from being the active one */
2365                                 slave->state = BOND_STATE_BACKUP;
2366                         }
2367
2368                         printk(KERN_INFO DRV_NAME
2369                                ": %s: link status definitely "
2370                                "up for interface %s.\n",
2371                                bond->dev->name, slave->dev->name);
2372
2373                         /* notify ad that the link status has changed */
2374                         if (bond->params.mode == BOND_MODE_8023AD)
2375                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2376
2377                         if (bond_is_lb(bond))
2378                                 bond_alb_handle_link_change(bond, slave,
2379                                                             BOND_LINK_UP);
2380
2381                         if (!bond->curr_active_slave ||
2382                             (slave == bond->primary_slave))
2383                                 goto do_failover;
2384
2385                         continue;
2386
2387                 case BOND_LINK_DOWN:
2388                         if (slave->link_failure_count < UINT_MAX)
2389                                 slave->link_failure_count++;
2390
2391                         slave->link = BOND_LINK_DOWN;
2392
2393                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2394                             bond->params.mode == BOND_MODE_8023AD)
2395                                 bond_set_slave_inactive_flags(slave);
2396
2397                         printk(KERN_INFO DRV_NAME
2398                                ": %s: link status definitely down for "
2399                                "interface %s, disabling it\n",
2400                                bond->dev->name, slave->dev->name);
2401
2402                         if (bond->params.mode == BOND_MODE_8023AD)
2403                                 bond_3ad_handle_link_change(slave,
2404                                                             BOND_LINK_DOWN);
2405
2406                         if (bond->params.mode == BOND_MODE_TLB ||
2407                             bond->params.mode == BOND_MODE_ALB)
2408                                 bond_alb_handle_link_change(bond, slave,
2409                                                             BOND_LINK_DOWN);
2410
2411                         if (slave == bond->curr_active_slave)
2412                                 goto do_failover;
2413
2414                         continue;
2415
2416                 default:
2417                         printk(KERN_ERR DRV_NAME
2418                                ": %s: invalid new link %d on slave %s\n",
2419                                bond->dev->name, slave->new_link,
2420                                slave->dev->name);
2421                         slave->new_link = BOND_LINK_NOCHANGE;
2422
2423                         continue;
2424                 }
2425
2426 do_failover:
2427                 ASSERT_RTNL();
2428                 write_lock_bh(&bond->curr_slave_lock);
2429                 bond_select_active_slave(bond);
2430                 write_unlock_bh(&bond->curr_slave_lock);
2431         }
2432
2433         bond_set_carrier(bond);
2434 }
2435
2436 /*
2437  * bond_mii_monitor
2438  *
2439  * Really a wrapper that splits the mii monitor into two phases: an
2440  * inspection, then (if inspection indicates something needs to be done)
2441  * an acquisition of appropriate locks followed by a commit phase to
2442  * implement whatever link state changes are indicated.
2443  */
2444 void bond_mii_monitor(struct work_struct *work)
2445 {
2446         struct bonding *bond = container_of(work, struct bonding,
2447                                             mii_work.work);
2448
2449         read_lock(&bond->lock);
2450         if (bond->kill_timers)
2451                 goto out;
2452
2453         if (bond->slave_cnt == 0)
2454                 goto re_arm;
2455
2456         if (bond->send_grat_arp) {
2457                 read_lock(&bond->curr_slave_lock);
2458                 bond_send_gratuitous_arp(bond);
2459                 read_unlock(&bond->curr_slave_lock);
2460         }
2461
2462         if (bond->send_unsol_na) {
2463                 read_lock(&bond->curr_slave_lock);
2464                 bond_send_unsolicited_na(bond);
2465                 read_unlock(&bond->curr_slave_lock);
2466         }
2467
2468         if (bond_miimon_inspect(bond)) {
2469                 read_unlock(&bond->lock);
2470                 rtnl_lock();
2471                 read_lock(&bond->lock);
2472
2473                 bond_miimon_commit(bond);
2474
2475                 read_unlock(&bond->lock);
2476                 rtnl_unlock();  /* might sleep, hold no other locks */
2477                 read_lock(&bond->lock);
2478         }
2479
2480 re_arm:
2481         if (bond->params.miimon)
2482                 queue_delayed_work(bond->wq, &bond->mii_work,
2483                                    msecs_to_jiffies(bond->params.miimon));
2484 out:
2485         read_unlock(&bond->lock);
2486 }
2487
2488 static __be32 bond_glean_dev_ip(struct net_device *dev)
2489 {
2490         struct in_device *idev;
2491         struct in_ifaddr *ifa;
2492         __be32 addr = 0;
2493
2494         if (!dev)
2495                 return 0;
2496
2497         rcu_read_lock();
2498         idev = __in_dev_get_rcu(dev);
2499         if (!idev)
2500                 goto out;
2501
2502         ifa = idev->ifa_list;
2503         if (!ifa)
2504                 goto out;
2505
2506         addr = ifa->ifa_local;
2507 out:
2508         rcu_read_unlock();
2509         return addr;
2510 }
2511
2512 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2513 {
2514         struct vlan_entry *vlan;
2515
2516         if (ip == bond->master_ip)
2517                 return 1;
2518
2519         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2520                 if (ip == vlan->vlan_ip)
2521                         return 1;
2522         }
2523
2524         return 0;
2525 }
2526
2527 /*
2528  * We go to the (large) trouble of VLAN tagging ARP frames because
2529  * switches in VLAN mode (especially if ports are configured as
2530  * "native" to a VLAN) might not pass non-tagged frames.
2531  */
2532 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2533 {
2534         struct sk_buff *skb;
2535
2536         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2537                slave_dev->name, dest_ip, src_ip, vlan_id);
2538
2539         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2540                          NULL, slave_dev->dev_addr, NULL);
2541
2542         if (!skb) {
2543                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2544                 return;
2545         }
2546         if (vlan_id) {
2547                 skb = vlan_put_tag(skb, vlan_id);
2548                 if (!skb) {
2549                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2550                         return;
2551                 }
2552         }
2553         arp_xmit(skb);
2554 }
2555
2556
2557 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2558 {
2559         int i, vlan_id, rv;
2560         __be32 *targets = bond->params.arp_targets;
2561         struct vlan_entry *vlan;
2562         struct net_device *vlan_dev;
2563         struct flowi fl;
2564         struct rtable *rt;
2565
2566         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2567                 if (!targets[i])
2568                         continue;
2569                 pr_debug("basa: target %x\n", targets[i]);
2570                 if (list_empty(&bond->vlan_list)) {
2571                         pr_debug("basa: empty vlan: arp_send\n");
2572                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2573                                       bond->master_ip, 0);
2574                         continue;
2575                 }
2576
2577                 /*
2578                  * If VLANs are configured, we do a route lookup to
2579                  * determine which VLAN interface would be used, so we
2580                  * can tag the ARP with the proper VLAN tag.
2581                  */
2582                 memset(&fl, 0, sizeof(fl));
2583                 fl.fl4_dst = targets[i];
2584                 fl.fl4_tos = RTO_ONLINK;
2585
2586                 rv = ip_route_output_key(&init_net, &rt, &fl);
2587                 if (rv) {
2588                         if (net_ratelimit()) {
2589                                 printk(KERN_WARNING DRV_NAME
2590                              ": %s: no route to arp_ip_target %pI4\n",
2591                                        bond->dev->name, &fl.fl4_dst);
2592                         }
2593                         continue;
2594                 }
2595
2596                 /*
2597                  * This target is not on a VLAN
2598                  */
2599                 if (rt->u.dst.dev == bond->dev) {
2600                         ip_rt_put(rt);
2601                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2602                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2603                                       bond->master_ip, 0);
2604                         continue;
2605                 }
2606
2607                 vlan_id = 0;
2608                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2609                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2610                         if (vlan_dev == rt->u.dst.dev) {
2611                                 vlan_id = vlan->vlan_id;
2612                                 pr_debug("basa: vlan match on %s %d\n",
2613                                        vlan_dev->name, vlan_id);
2614                                 break;
2615                         }
2616                 }
2617
2618                 if (vlan_id) {
2619                         ip_rt_put(rt);
2620                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2621                                       vlan->vlan_ip, vlan_id);
2622                         continue;
2623                 }
2624
2625                 if (net_ratelimit()) {
2626                         printk(KERN_WARNING DRV_NAME
2627                ": %s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2628                                bond->dev->name, &fl.fl4_dst,
2629                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2630                 }
2631                 ip_rt_put(rt);
2632         }
2633 }
2634
2635 /*
2636  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2637  * for each VLAN above us.
2638  *
2639  * Caller must hold curr_slave_lock for read or better
2640  */
2641 static void bond_send_gratuitous_arp(struct bonding *bond)
2642 {
2643         struct slave *slave = bond->curr_active_slave;
2644         struct vlan_entry *vlan;
2645         struct net_device *vlan_dev;
2646
2647         pr_debug("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2648                                 slave ? slave->dev->name : "NULL");
2649
2650         if (!slave || !bond->send_grat_arp ||
2651             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2652                 return;
2653
2654         bond->send_grat_arp--;
2655
2656         if (bond->master_ip) {
2657                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2658                                 bond->master_ip, 0);
2659         }
2660
2661         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2662                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2663                 if (vlan->vlan_ip) {
2664                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2665                                       vlan->vlan_ip, vlan->vlan_id);
2666                 }
2667         }
2668 }
2669
2670 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2671 {
2672         int i;
2673         __be32 *targets = bond->params.arp_targets;
2674
2675         targets = bond->params.arp_targets;
2676         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2677                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2678                         &sip, &tip, i, &targets[i], bond_has_this_ip(bond, tip));
2679                 if (sip == targets[i]) {
2680                         if (bond_has_this_ip(bond, tip))
2681                                 slave->last_arp_rx = jiffies;
2682                         return;
2683                 }
2684         }
2685 }
2686
2687 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2688 {
2689         struct arphdr *arp;
2690         struct slave *slave;
2691         struct bonding *bond;
2692         unsigned char *arp_ptr;
2693         __be32 sip, tip;
2694
2695         if (dev_net(dev) != &init_net)
2696                 goto out;
2697
2698         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2699                 goto out;
2700
2701         bond = netdev_priv(dev);
2702         read_lock(&bond->lock);
2703
2704         pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2705                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2706                 orig_dev ? orig_dev->name : "NULL");
2707
2708         slave = bond_get_slave_by_dev(bond, orig_dev);
2709         if (!slave || !slave_do_arp_validate(bond, slave))
2710                 goto out_unlock;
2711
2712         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2713                 goto out_unlock;
2714
2715         arp = arp_hdr(skb);
2716         if (arp->ar_hln != dev->addr_len ||
2717             skb->pkt_type == PACKET_OTHERHOST ||
2718             skb->pkt_type == PACKET_LOOPBACK ||
2719             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2720             arp->ar_pro != htons(ETH_P_IP) ||
2721             arp->ar_pln != 4)
2722                 goto out_unlock;
2723
2724         arp_ptr = (unsigned char *)(arp + 1);
2725         arp_ptr += dev->addr_len;
2726         memcpy(&sip, arp_ptr, 4);
2727         arp_ptr += 4 + dev->addr_len;
2728         memcpy(&tip, arp_ptr, 4);
2729
2730         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2731                 bond->dev->name, slave->dev->name, slave->state,
2732                 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2733                 &sip, &tip);
2734
2735         /*
2736          * Backup slaves won't see the ARP reply, but do come through
2737          * here for each ARP probe (so we swap the sip/tip to validate
2738          * the probe).  In a "redundant switch, common router" type of
2739          * configuration, the ARP probe will (hopefully) travel from
2740          * the active, through one switch, the router, then the other
2741          * switch before reaching the backup.
2742          */
2743         if (slave->state == BOND_STATE_ACTIVE)
2744                 bond_validate_arp(bond, slave, sip, tip);
2745         else
2746                 bond_validate_arp(bond, slave, tip, sip);
2747
2748 out_unlock:
2749         read_unlock(&bond->lock);
2750 out:
2751         dev_kfree_skb(skb);
2752         return NET_RX_SUCCESS;
2753 }
2754
2755 /*
2756  * this function is called regularly to monitor each slave's link
2757  * ensuring that traffic is being sent and received when arp monitoring
2758  * is used in load-balancing mode. if the adapter has been dormant, then an
2759  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2760  * arp monitoring in active backup mode.
2761  */
2762 void bond_loadbalance_arp_mon(struct work_struct *work)
2763 {
2764         struct bonding *bond = container_of(work, struct bonding,
2765                                             arp_work.work);
2766         struct slave *slave, *oldcurrent;
2767         int do_failover = 0;
2768         int delta_in_ticks;
2769         int i;
2770
2771         read_lock(&bond->lock);
2772
2773         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2774
2775         if (bond->kill_timers) {
2776                 goto out;
2777         }
2778
2779         if (bond->slave_cnt == 0) {
2780                 goto re_arm;
2781         }
2782
2783         read_lock(&bond->curr_slave_lock);
2784         oldcurrent = bond->curr_active_slave;
2785         read_unlock(&bond->curr_slave_lock);
2786
2787         /* see if any of the previous devices are up now (i.e. they have
2788          * xmt and rcv traffic). the curr_active_slave does not come into
2789          * the picture unless it is null. also, slave->jiffies is not needed
2790          * here because we send an arp on each slave and give a slave as
2791          * long as it needs to get the tx/rx within the delta.
2792          * TODO: what about up/down delay in arp mode? it wasn't here before
2793          *       so it can wait
2794          */
2795         bond_for_each_slave(bond, slave, i) {
2796                 if (slave->link != BOND_LINK_UP) {
2797                         if (time_before_eq(jiffies, slave->dev->trans_start + delta_in_ticks) &&
2798                             time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
2799
2800                                 slave->link  = BOND_LINK_UP;
2801                                 slave->state = BOND_STATE_ACTIVE;
2802
2803                                 /* primary_slave has no meaning in round-robin
2804                                  * mode. the window of a slave being up and
2805                                  * curr_active_slave being null after enslaving
2806                                  * is closed.
2807                                  */
2808                                 if (!oldcurrent) {
2809                                         printk(KERN_INFO DRV_NAME
2810                                                ": %s: link status definitely "
2811                                                "up for interface %s, ",
2812                                                bond->dev->name,
2813                                                slave->dev->name);
2814                                         do_failover = 1;
2815                                 } else {
2816                                         printk(KERN_INFO DRV_NAME
2817                                                ": %s: interface %s is now up\n",
2818                                                bond->dev->name,
2819                                                slave->dev->name);
2820                                 }
2821                         }
2822                 } else {
2823                         /* slave->link == BOND_LINK_UP */
2824
2825                         /* not all switches will respond to an arp request
2826                          * when the source ip is 0, so don't take the link down
2827                          * if we don't know our ip yet
2828                          */
2829                         if (time_after_eq(jiffies, slave->dev->trans_start + 2*delta_in_ticks) ||
2830                             (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks))) {
2831
2832                                 slave->link  = BOND_LINK_DOWN;
2833                                 slave->state = BOND_STATE_BACKUP;
2834
2835                                 if (slave->link_failure_count < UINT_MAX) {
2836                                         slave->link_failure_count++;
2837                                 }
2838
2839                                 printk(KERN_INFO DRV_NAME
2840                                        ": %s: interface %s is now down.\n",
2841                                        bond->dev->name,
2842                                        slave->dev->name);
2843
2844                                 if (slave == oldcurrent) {
2845                                         do_failover = 1;
2846                                 }
2847                         }
2848                 }
2849
2850                 /* note: if switch is in round-robin mode, all links
2851                  * must tx arp to ensure all links rx an arp - otherwise
2852                  * links may oscillate or not come up at all; if switch is
2853                  * in something like xor mode, there is nothing we can
2854                  * do - all replies will be rx'ed on same link causing slaves
2855                  * to be unstable during low/no traffic periods
2856                  */
2857                 if (IS_UP(slave->dev)) {
2858                         bond_arp_send_all(bond, slave);
2859                 }
2860         }
2861
2862         if (do_failover) {
2863                 write_lock_bh(&bond->curr_slave_lock);
2864
2865                 bond_select_active_slave(bond);
2866
2867                 write_unlock_bh(&bond->curr_slave_lock);
2868         }
2869
2870 re_arm:
2871         if (bond->params.arp_interval)
2872                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2873 out:
2874         read_unlock(&bond->lock);
2875 }
2876
2877 /*
2878  * Called to inspect slaves for active-backup mode ARP monitor link state
2879  * changes.  Sets new_link in slaves to specify what action should take
2880  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2881  * to link states must be committed.
2882  *
2883  * Called with bond->lock held for read.
2884  */
2885 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2886 {
2887         struct slave *slave;
2888         int i, commit = 0;
2889
2890         bond_for_each_slave(bond, slave, i) {
2891                 slave->new_link = BOND_LINK_NOCHANGE;
2892
2893                 if (slave->link != BOND_LINK_UP) {
2894                         if (time_before_eq(jiffies, slave_last_rx(bond, slave) +
2895                                            delta_in_ticks)) {
2896                                 slave->new_link = BOND_LINK_UP;
2897                                 commit++;
2898                         }
2899
2900                         continue;
2901                 }
2902
2903                 /*
2904                  * Give slaves 2*delta after being enslaved or made
2905                  * active.  This avoids bouncing, as the last receive
2906                  * times need a full ARP monitor cycle to be updated.
2907                  */
2908                 if (!time_after_eq(jiffies, slave->jiffies +
2909                                    2 * delta_in_ticks))
2910                         continue;
2911
2912                 /*
2913                  * Backup slave is down if:
2914                  * - No current_arp_slave AND
2915                  * - more than 3*delta since last receive AND
2916                  * - the bond has an IP address
2917                  *
2918                  * Note: a non-null current_arp_slave indicates
2919                  * the curr_active_slave went down and we are
2920                  * searching for a new one; under this condition
2921                  * we only take the curr_active_slave down - this
2922                  * gives each slave a chance to tx/rx traffic
2923                  * before being taken out
2924                  */
2925                 if (slave->state == BOND_STATE_BACKUP &&
2926                     !bond->current_arp_slave &&
2927                     time_after(jiffies, slave_last_rx(bond, slave) +
2928                                3 * delta_in_ticks)) {
2929                         slave->new_link = BOND_LINK_DOWN;
2930                         commit++;
2931                 }
2932
2933                 /*
2934                  * Active slave is down if:
2935                  * - more than 2*delta since transmitting OR
2936                  * - (more than 2*delta since receive AND
2937                  *    the bond has an IP address)
2938                  */
2939                 if ((slave->state == BOND_STATE_ACTIVE) &&
2940                     (time_after_eq(jiffies, slave->dev->trans_start +
2941                                     2 * delta_in_ticks) ||
2942                       (time_after_eq(jiffies, slave_last_rx(bond, slave)
2943                                      + 2 * delta_in_ticks)))) {
2944                         slave->new_link = BOND_LINK_DOWN;
2945                         commit++;
2946                 }
2947         }
2948
2949         read_lock(&bond->curr_slave_lock);
2950
2951         /*
2952          * Trigger a commit if the primary option setting has changed.
2953          */
2954         if (bond->primary_slave &&
2955             (bond->primary_slave != bond->curr_active_slave) &&
2956             (bond->primary_slave->link == BOND_LINK_UP))
2957                 commit++;
2958
2959         read_unlock(&bond->curr_slave_lock);
2960
2961         return commit;
2962 }
2963
2964 /*
2965  * Called to commit link state changes noted by inspection step of
2966  * active-backup mode ARP monitor.
2967  *
2968  * Called with RTNL and bond->lock for read.
2969  */
2970 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2971 {
2972         struct slave *slave;
2973         int i;
2974
2975         bond_for_each_slave(bond, slave, i) {
2976                 switch (slave->new_link) {
2977                 case BOND_LINK_NOCHANGE:
2978                         continue;
2979
2980                 case BOND_LINK_UP:
2981                         write_lock_bh(&bond->curr_slave_lock);
2982
2983                         if (!bond->curr_active_slave &&
2984                             time_before_eq(jiffies, slave->dev->trans_start +
2985                                            delta_in_ticks)) {
2986                                 slave->link = BOND_LINK_UP;
2987                                 bond_change_active_slave(bond, slave);
2988                                 bond->current_arp_slave = NULL;
2989
2990                                 printk(KERN_INFO DRV_NAME
2991                                        ": %s: %s is up and now the "
2992                                        "active interface\n",
2993                                        bond->dev->name, slave->dev->name);
2994
2995                         } else if (bond->curr_active_slave != slave) {
2996                                 /* this slave has just come up but we
2997                                  * already have a current slave; this can
2998                                  * also happen if bond_enslave adds a new
2999                                  * slave that is up while we are searching
3000                                  * for a new slave
3001                                  */
3002                                 slave->link = BOND_LINK_UP;
3003                                 bond_set_slave_inactive_flags(slave);
3004                                 bond->current_arp_slave = NULL;
3005
3006                                 printk(KERN_INFO DRV_NAME
3007                                        ": %s: backup interface %s is now up\n",
3008                                        bond->dev->name, slave->dev->name);
3009                         }
3010
3011                         write_unlock_bh(&bond->curr_slave_lock);
3012
3013                         break;
3014
3015                 case BOND_LINK_DOWN:
3016                         if (slave->link_failure_count < UINT_MAX)
3017                                 slave->link_failure_count++;
3018
3019                         slave->link = BOND_LINK_DOWN;
3020
3021                         if (slave == bond->curr_active_slave) {
3022                                 printk(KERN_INFO DRV_NAME
3023                                        ": %s: link status down for active "
3024                                        "interface %s, disabling it\n",
3025                                        bond->dev->name, slave->dev->name);
3026
3027                                 bond_set_slave_inactive_flags(slave);
3028
3029                                 write_lock_bh(&bond->curr_slave_lock);
3030
3031                                 bond_select_active_slave(bond);
3032                                 if (bond->curr_active_slave)
3033                                         bond->curr_active_slave->jiffies =
3034                                                 jiffies;
3035
3036                                 write_unlock_bh(&bond->curr_slave_lock);
3037
3038                                 bond->current_arp_slave = NULL;
3039
3040                         } else if (slave->state == BOND_STATE_BACKUP) {
3041                                 printk(KERN_INFO DRV_NAME
3042                                        ": %s: backup interface %s is now down\n",
3043                                        bond->dev->name, slave->dev->name);
3044
3045                                 bond_set_slave_inactive_flags(slave);
3046                         }
3047                         break;
3048
3049                 default:
3050                         printk(KERN_ERR DRV_NAME
3051                                ": %s: impossible: new_link %d on slave %s\n",
3052                                bond->dev->name, slave->new_link,
3053                                slave->dev->name);
3054                 }
3055         }
3056
3057         /*
3058          * No race with changes to primary via sysfs, as we hold rtnl.
3059          */
3060         if (bond->primary_slave &&
3061             (bond->primary_slave != bond->curr_active_slave) &&
3062             (bond->primary_slave->link == BOND_LINK_UP)) {
3063                 write_lock_bh(&bond->curr_slave_lock);
3064                 bond_change_active_slave(bond, bond->primary_slave);
3065                 write_unlock_bh(&bond->curr_slave_lock);
3066         }
3067
3068         bond_set_carrier(bond);
3069 }
3070
3071 /*
3072  * Send ARP probes for active-backup mode ARP monitor.
3073  *
3074  * Called with bond->lock held for read.
3075  */
3076 static void bond_ab_arp_probe(struct bonding *bond)
3077 {
3078         struct slave *slave;
3079         int i;
3080
3081         read_lock(&bond->curr_slave_lock);
3082
3083         if (bond->current_arp_slave && bond->curr_active_slave)
3084                 printk("PROBE: c_arp %s && cas %s BAD\n",
3085                        bond->current_arp_slave->dev->name,
3086                        bond->curr_active_slave->dev->name);
3087
3088         if (bond->curr_active_slave) {
3089                 bond_arp_send_all(bond, bond->curr_active_slave);
3090                 read_unlock(&bond->curr_slave_lock);
3091                 return;
3092         }
3093
3094         read_unlock(&bond->curr_slave_lock);
3095
3096         /* if we don't have a curr_active_slave, search for the next available
3097          * backup slave from the current_arp_slave and make it the candidate
3098          * for becoming the curr_active_slave
3099          */
3100
3101         if (!bond->current_arp_slave) {
3102                 bond->current_arp_slave = bond->first_slave;
3103                 if (!bond->current_arp_slave)
3104                         return;
3105         }
3106
3107         bond_set_slave_inactive_flags(bond->current_arp_slave);
3108
3109         /* search for next candidate */
3110         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3111                 if (IS_UP(slave->dev)) {
3112                         slave->link = BOND_LINK_BACK;
3113                         bond_set_slave_active_flags(slave);
3114                         bond_arp_send_all(bond, slave);
3115                         slave->jiffies = jiffies;
3116                         bond->current_arp_slave = slave;
3117                         break;
3118                 }
3119
3120                 /* if the link state is up at this point, we
3121                  * mark it down - this can happen if we have
3122                  * simultaneous link failures and
3123                  * reselect_active_interface doesn't make this
3124                  * one the current slave so it is still marked
3125                  * up when it is actually down
3126                  */
3127                 if (slave->link == BOND_LINK_UP) {
3128                         slave->link = BOND_LINK_DOWN;
3129                         if (slave->link_failure_count < UINT_MAX)
3130                                 slave->link_failure_count++;
3131
3132                         bond_set_slave_inactive_flags(slave);
3133
3134                         printk(KERN_INFO DRV_NAME
3135                                ": %s: backup interface %s is now down.\n",
3136                                bond->dev->name, slave->dev->name);
3137                 }
3138         }
3139 }
3140
3141 void bond_activebackup_arp_mon(struct work_struct *work)
3142 {
3143         struct bonding *bond = container_of(work, struct bonding,
3144                                             arp_work.work);
3145         int delta_in_ticks;
3146
3147         read_lock(&bond->lock);
3148
3149         if (bond->kill_timers)
3150                 goto out;
3151
3152         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3153
3154         if (bond->slave_cnt == 0)
3155                 goto re_arm;
3156
3157         if (bond->send_grat_arp) {
3158                 read_lock(&bond->curr_slave_lock);
3159                 bond_send_gratuitous_arp(bond);
3160                 read_unlock(&bond->curr_slave_lock);
3161         }
3162
3163         if (bond->send_unsol_na) {
3164                 read_lock(&bond->curr_slave_lock);
3165                 bond_send_unsolicited_na(bond);
3166                 read_unlock(&bond->curr_slave_lock);
3167         }
3168
3169         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3170                 read_unlock(&bond->lock);
3171                 rtnl_lock();
3172                 read_lock(&bond->lock);
3173
3174                 bond_ab_arp_commit(bond, delta_in_ticks);
3175
3176                 read_unlock(&bond->lock);
3177                 rtnl_unlock();
3178                 read_lock(&bond->lock);
3179         }
3180
3181         bond_ab_arp_probe(bond);
3182
3183 re_arm:
3184         if (bond->params.arp_interval) {
3185                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3186         }
3187 out:
3188         read_unlock(&bond->lock);
3189 }
3190
3191 /*------------------------------ proc/seq_file-------------------------------*/
3192
3193 #ifdef CONFIG_PROC_FS
3194
3195 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3196 {
3197         struct bonding *bond = seq->private;
3198         loff_t off = 0;
3199         struct slave *slave;
3200         int i;
3201
3202         /* make sure the bond won't be taken away */
3203         read_lock(&dev_base_lock);
3204         read_lock(&bond->lock);
3205
3206         if (*pos == 0) {
3207                 return SEQ_START_TOKEN;
3208         }
3209
3210         bond_for_each_slave(bond, slave, i) {
3211                 if (++off == *pos) {
3212                         return slave;
3213                 }
3214         }
3215
3216         return NULL;
3217 }
3218
3219 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3220 {
3221         struct bonding *bond = seq->private;
3222         struct slave *slave = v;
3223
3224         ++*pos;
3225         if (v == SEQ_START_TOKEN) {
3226                 return bond->first_slave;
3227         }
3228
3229         slave = slave->next;
3230
3231         return (slave == bond->first_slave) ? NULL : slave;
3232 }
3233
3234 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3235 {
3236         struct bonding *bond = seq->private;
3237
3238         read_unlock(&bond->lock);
3239         read_unlock(&dev_base_lock);
3240 }
3241
3242 static void bond_info_show_master(struct seq_file *seq)
3243 {
3244         struct bonding *bond = seq->private;
3245         struct slave *curr;
3246         int i;
3247
3248         read_lock(&bond->curr_slave_lock);
3249         curr = bond->curr_active_slave;
3250         read_unlock(&bond->curr_slave_lock);
3251
3252         seq_printf(seq, "Bonding Mode: %s",
3253                    bond_mode_name(bond->params.mode));
3254
3255         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3256             bond->params.fail_over_mac)
3257                 seq_printf(seq, " (fail_over_mac %s)",
3258                    fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3259
3260         seq_printf(seq, "\n");
3261
3262         if (bond->params.mode == BOND_MODE_XOR ||
3263                 bond->params.mode == BOND_MODE_8023AD) {
3264                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3265                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3266                         bond->params.xmit_policy);
3267         }
3268
3269         if (USES_PRIMARY(bond->params.mode)) {
3270                 seq_printf(seq, "Primary Slave: %s\n",
3271                            (bond->primary_slave) ?
3272                            bond->primary_slave->dev->name : "None");
3273
3274                 seq_printf(seq, "Currently Active Slave: %s\n",
3275                            (curr) ? curr->dev->name : "None");
3276         }
3277
3278         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3279                    "up" : "down");
3280         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3281         seq_printf(seq, "Up Delay (ms): %d\n",
3282                    bond->params.updelay * bond->params.miimon);
3283         seq_printf(seq, "Down Delay (ms): %d\n",
3284                    bond->params.downdelay * bond->params.miimon);
3285
3286
3287         /* ARP information */
3288         if(bond->params.arp_interval > 0) {
3289                 int printed=0;
3290                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3291                                 bond->params.arp_interval);
3292
3293                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3294
3295                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3296                         if (!bond->params.arp_targets[i])
3297                                 continue;
3298                         if (printed)
3299                                 seq_printf(seq, ",");
3300                         seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3301                         printed = 1;
3302                 }
3303                 seq_printf(seq, "\n");
3304         }
3305
3306         if (bond->params.mode == BOND_MODE_8023AD) {
3307                 struct ad_info ad_info;
3308
3309                 seq_puts(seq, "\n802.3ad info\n");
3310                 seq_printf(seq, "LACP rate: %s\n",
3311                            (bond->params.lacp_fast) ? "fast" : "slow");
3312                 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3313                            ad_select_tbl[bond->params.ad_select].modename);
3314
3315                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3316                         seq_printf(seq, "bond %s has no active aggregator\n",
3317                                    bond->dev->name);
3318                 } else {
3319                         seq_printf(seq, "Active Aggregator Info:\n");
3320
3321                         seq_printf(seq, "\tAggregator ID: %d\n",
3322                                    ad_info.aggregator_id);
3323                         seq_printf(seq, "\tNumber of ports: %d\n",
3324                                    ad_info.ports);
3325                         seq_printf(seq, "\tActor Key: %d\n",
3326                                    ad_info.actor_key);
3327                         seq_printf(seq, "\tPartner Key: %d\n",
3328                                    ad_info.partner_key);
3329                         seq_printf(seq, "\tPartner Mac Address: %pM\n",
3330                                    ad_info.partner_system);
3331                 }
3332         }
3333 }
3334
3335 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3336 {
3337         struct bonding *bond = seq->private;
3338
3339         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3340         seq_printf(seq, "MII Status: %s\n",
3341                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3342         seq_printf(seq, "Link Failure Count: %u\n",
3343                    slave->link_failure_count);
3344
3345         seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3346
3347         if (bond->params.mode == BOND_MODE_8023AD) {
3348                 const struct aggregator *agg
3349                         = SLAVE_AD_INFO(slave).port.aggregator;
3350
3351                 if (agg) {
3352                         seq_printf(seq, "Aggregator ID: %d\n",
3353                                    agg->aggregator_identifier);
3354                 } else {
3355                         seq_puts(seq, "Aggregator ID: N/A\n");
3356                 }
3357         }
3358 }
3359
3360 static int bond_info_seq_show(struct seq_file *seq, void *v)
3361 {
3362         if (v == SEQ_START_TOKEN) {
3363                 seq_printf(seq, "%s\n", version);
3364                 bond_info_show_master(seq);
3365         } else {
3366                 bond_info_show_slave(seq, v);
3367         }
3368
3369         return 0;
3370 }
3371
3372 static struct seq_operations bond_info_seq_ops = {
3373         .start = bond_info_seq_start,
3374         .next  = bond_info_seq_next,
3375         .stop  = bond_info_seq_stop,
3376         .show  = bond_info_seq_show,
3377 };
3378
3379 static int bond_info_open(struct inode *inode, struct file *file)
3380 {
3381         struct seq_file *seq;
3382         struct proc_dir_entry *proc;
3383         int res;
3384
3385         res = seq_open(file, &bond_info_seq_ops);
3386         if (!res) {
3387                 /* recover the pointer buried in proc_dir_entry data */
3388                 seq = file->private_data;
3389                 proc = PDE(inode);
3390                 seq->private = proc->data;
3391         }
3392
3393         return res;
3394 }
3395
3396 static const struct file_operations bond_info_fops = {
3397         .owner   = THIS_MODULE,
3398         .open    = bond_info_open,
3399         .read    = seq_read,
3400         .llseek  = seq_lseek,
3401         .release = seq_release,
3402 };
3403
3404 static int bond_create_proc_entry(struct bonding *bond)
3405 {
3406         struct net_device *bond_dev = bond->dev;
3407
3408         if (bond_proc_dir) {
3409                 bond->proc_entry = proc_create_data(bond_dev->name,
3410                                                     S_IRUGO, bond_proc_dir,
3411                                                     &bond_info_fops, bond);
3412                 if (bond->proc_entry == NULL) {
3413                         printk(KERN_WARNING DRV_NAME
3414                                ": Warning: Cannot create /proc/net/%s/%s\n",
3415                                DRV_NAME, bond_dev->name);
3416                 } else {
3417                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3418                 }
3419         }
3420
3421         return 0;
3422 }
3423
3424 static void bond_remove_proc_entry(struct bonding *bond)
3425 {
3426         if (bond_proc_dir && bond->proc_entry) {
3427                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3428                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3429                 bond->proc_entry = NULL;
3430         }
3431 }
3432
3433 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3434  * Caller must hold rtnl_lock.
3435  */
3436 static void bond_create_proc_dir(void)
3437 {
3438         int len = strlen(DRV_NAME);
3439
3440         for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
3441              bond_proc_dir = bond_proc_dir->next) {
3442                 if ((bond_proc_dir->namelen == len) &&
3443                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3444                         break;
3445                 }
3446         }
3447
3448         if (!bond_proc_dir) {
3449                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3450                 if (bond_proc_dir) {
3451                         bond_proc_dir->owner = THIS_MODULE;
3452                 } else {
3453                         printk(KERN_WARNING DRV_NAME
3454                                 ": Warning: cannot create /proc/net/%s\n",
3455                                 DRV_NAME);
3456                 }
3457         }
3458 }
3459
3460 /* Destroy the bonding directory under /proc/net, if empty.
3461  * Caller must hold rtnl_lock.
3462  */
3463 static void bond_destroy_proc_dir(void)
3464 {
3465         struct proc_dir_entry *de;
3466
3467         if (!bond_proc_dir) {
3468                 return;
3469         }
3470
3471         /* verify that the /proc dir is empty */
3472         for (de = bond_proc_dir->subdir; de; de = de->next) {
3473                 /* ignore . and .. */
3474                 if (*(de->name) != '.') {
3475                         break;
3476                 }
3477         }
3478
3479         if (de) {
3480                 if (bond_proc_dir->owner == THIS_MODULE) {
3481                         bond_proc_dir->owner = NULL;
3482                 }
3483         } else {
3484                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3485                 bond_proc_dir = NULL;
3486         }
3487 }
3488 #endif /* CONFIG_PROC_FS */
3489
3490 /*-------------------------- netdev event handling --------------------------*/
3491
3492 /*
3493  * Change device name
3494  */
3495 static int bond_event_changename(struct bonding *bond)
3496 {
3497 #ifdef CONFIG_PROC_FS
3498         bond_remove_proc_entry(bond);
3499         bond_create_proc_entry(bond);
3500 #endif
3501         down_write(&(bonding_rwsem));
3502         bond_destroy_sysfs_entry(bond);
3503         bond_create_sysfs_entry(bond);
3504         up_write(&(bonding_rwsem));
3505         return NOTIFY_DONE;
3506 }
3507
3508 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3509 {
3510         struct bonding *event_bond = netdev_priv(bond_dev);
3511
3512         switch (event) {
3513         case NETDEV_CHANGENAME:
3514                 return bond_event_changename(event_bond);
3515         case NETDEV_UNREGISTER:
3516                 bond_release_all(event_bond->dev);
3517                 break;
3518         default:
3519                 break;
3520         }
3521
3522         return NOTIFY_DONE;
3523 }
3524
3525 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3526 {
3527         struct net_device *bond_dev = slave_dev->master;
3528         struct bonding *bond = netdev_priv(bond_dev);
3529
3530         switch (event) {
3531         case NETDEV_UNREGISTER:
3532                 if (bond_dev) {
3533                         if (bond->setup_by_slave)
3534                                 bond_release_and_destroy(bond_dev, slave_dev);
3535                         else
3536                                 bond_release(bond_dev, slave_dev);
3537                 }
3538                 break;
3539         case NETDEV_CHANGE:
3540                 /*
3541                  * TODO: is this what we get if somebody
3542                  * sets up a hierarchical bond, then rmmod's
3543                  * one of the slave bonding devices?
3544                  */
3545                 break;
3546         case NETDEV_DOWN:
3547                 /*
3548                  * ... Or is it this?
3549                  */
3550                 break;
3551         case NETDEV_CHANGEMTU:
3552                 /*
3553                  * TODO: Should slaves be allowed to
3554                  * independently alter their MTU?  For
3555                  * an active-backup bond, slaves need
3556                  * not be the same type of device, so
3557                  * MTUs may vary.  For other modes,
3558                  * slaves arguably should have the
3559                  * same MTUs. To do this, we'd need to
3560                  * take over the slave's change_mtu
3561                  * function for the duration of their
3562                  * servitude.
3563                  */
3564                 break;
3565         case NETDEV_CHANGENAME:
3566                 /*
3567                  * TODO: handle changing the primary's name
3568                  */
3569                 break;
3570         case NETDEV_FEAT_CHANGE:
3571                 bond_compute_features(bond);
3572                 break;
3573         default:
3574                 break;
3575         }
3576
3577         return NOTIFY_DONE;
3578 }
3579
3580 /*
3581  * bond_netdev_event: handle netdev notifier chain events.
3582  *
3583  * This function receives events for the netdev chain.  The caller (an
3584  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3585  * locks for us to safely manipulate the slave devices (RTNL lock,
3586  * dev_probe_lock).
3587  */
3588 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3589 {
3590         struct net_device *event_dev = (struct net_device *)ptr;
3591
3592         if (dev_net(event_dev) != &init_net)
3593                 return NOTIFY_DONE;
3594
3595         pr_debug("event_dev: %s, event: %lx\n",
3596                 (event_dev ? event_dev->name : "None"),
3597                 event);
3598
3599         if (!(event_dev->priv_flags & IFF_BONDING))
3600                 return NOTIFY_DONE;
3601
3602         if (event_dev->flags & IFF_MASTER) {
3603                 pr_debug("IFF_MASTER\n");
3604                 return bond_master_netdev_event(event, event_dev);
3605         }
3606
3607         if (event_dev->flags & IFF_SLAVE) {
3608                 pr_debug("IFF_SLAVE\n");
3609                 return bond_slave_netdev_event(event, event_dev);
3610         }
3611
3612         return NOTIFY_DONE;
3613 }
3614
3615 /*
3616  * bond_inetaddr_event: handle inetaddr notifier chain events.
3617  *
3618  * We keep track of device IPs primarily to use as source addresses in
3619  * ARP monitor probes (rather than spewing out broadcasts all the time).
3620  *
3621  * We track one IP for the main device (if it has one), plus one per VLAN.
3622  */
3623 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3624 {
3625         struct in_ifaddr *ifa = ptr;
3626         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3627         struct bonding *bond;
3628         struct vlan_entry *vlan;
3629
3630         if (dev_net(ifa->ifa_dev->dev) != &init_net)
3631                 return NOTIFY_DONE;
3632
3633         list_for_each_entry(bond, &bond_dev_list, bond_list) {
3634                 if (bond->dev == event_dev) {
3635                         switch (event) {
3636                         case NETDEV_UP:
3637                                 bond->master_ip = ifa->ifa_local;
3638                                 return NOTIFY_OK;
3639                         case NETDEV_DOWN:
3640                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3641                                 return NOTIFY_OK;
3642                         default:
3643                                 return NOTIFY_DONE;
3644                         }
3645                 }
3646
3647                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3648                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3649                         if (vlan_dev == event_dev) {
3650                                 switch (event) {
3651                                 case NETDEV_UP:
3652                                         vlan->vlan_ip = ifa->ifa_local;
3653                                         return NOTIFY_OK;
3654                                 case NETDEV_DOWN:
3655                                         vlan->vlan_ip =
3656                                                 bond_glean_dev_ip(vlan_dev);
3657                                         return NOTIFY_OK;
3658                                 default:
3659                                         return NOTIFY_DONE;
3660                                 }
3661                         }
3662                 }
3663         }
3664         return NOTIFY_DONE;
3665 }
3666
3667 static struct notifier_block bond_netdev_notifier = {
3668         .notifier_call = bond_netdev_event,
3669 };
3670
3671 static struct notifier_block bond_inetaddr_notifier = {
3672         .notifier_call = bond_inetaddr_event,
3673 };
3674
3675 /*-------------------------- Packet type handling ---------------------------*/
3676
3677 /* register to receive lacpdus on a bond */
3678 static void bond_register_lacpdu(struct bonding *bond)
3679 {
3680         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3681
3682         /* initialize packet type */
3683         pk_type->type = PKT_TYPE_LACPDU;
3684         pk_type->dev = bond->dev;
3685         pk_type->func = bond_3ad_lacpdu_recv;
3686
3687         dev_add_pack(pk_type);
3688 }
3689
3690 /* unregister to receive lacpdus on a bond */
3691 static void bond_unregister_lacpdu(struct bonding *bond)
3692 {
3693         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3694 }
3695
3696 void bond_register_arp(struct bonding *bond)
3697 {
3698         struct packet_type *pt = &bond->arp_mon_pt;
3699
3700         if (pt->type)
3701                 return;
3702
3703         pt->type = htons(ETH_P_ARP);
3704         pt->dev = bond->dev;
3705         pt->func = bond_arp_rcv;
3706         dev_add_pack(pt);
3707 }
3708
3709 void bond_unregister_arp(struct bonding *bond)
3710 {
3711         struct packet_type *pt = &bond->arp_mon_pt;
3712
3713         dev_remove_pack(pt);
3714         pt->type = 0;
3715 }
3716
3717 /*---------------------------- Hashing Policies -----------------------------*/
3718
3719 /*
3720  * Hash for the output device based upon layer 2 and layer 3 data. If
3721  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3722  */
3723 static int bond_xmit_hash_policy_l23(struct sk_buff *skb,
3724                                      struct net_device *bond_dev, int count)
3725 {
3726         struct ethhdr *data = (struct ethhdr *)skb->data;
3727         struct iphdr *iph = ip_hdr(skb);
3728
3729         if (skb->protocol == htons(ETH_P_IP)) {
3730                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3731                         (data->h_dest[5] ^ bond_dev->dev_addr[5])) % count;
3732         }
3733
3734         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3735 }
3736
3737 /*
3738  * Hash for the output device based upon layer 3 and layer 4 data. If
3739  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3740  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3741  */
3742 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3743                                     struct net_device *bond_dev, int count)
3744 {
3745         struct ethhdr *data = (struct ethhdr *)skb->data;
3746         struct iphdr *iph = ip_hdr(skb);
3747         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3748         int layer4_xor = 0;
3749
3750         if (skb->protocol == htons(ETH_P_IP)) {
3751                 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3752                     (iph->protocol == IPPROTO_TCP ||
3753                      iph->protocol == IPPROTO_UDP)) {
3754                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3755                 }
3756                 return (layer4_xor ^
3757                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3758
3759         }
3760
3761         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3762 }
3763
3764 /*
3765  * Hash for the output device based upon layer 2 data
3766  */
3767 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3768                                    struct net_device *bond_dev, int count)
3769 {
3770         struct ethhdr *data = (struct ethhdr *)skb->data;
3771
3772         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3773 }
3774
3775 /*-------------------------- Device entry points ----------------------------*/
3776
3777 static int bond_open(struct net_device *bond_dev)
3778 {
3779         struct bonding *bond = netdev_priv(bond_dev);
3780
3781         bond->kill_timers = 0;
3782
3783         if (bond_is_lb(bond)) {
3784                 /* bond_alb_initialize must be called before the timer
3785                  * is started.
3786                  */
3787                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3788                         /* something went wrong - fail the open operation */
3789                         return -1;
3790                 }
3791
3792                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3793                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3794         }
3795
3796         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3797                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3798                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3799         }
3800
3801         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3802                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3803                         INIT_DELAYED_WORK(&bond->arp_work,
3804                                           bond_activebackup_arp_mon);
3805                 else
3806                         INIT_DELAYED_WORK(&bond->arp_work,
3807                                           bond_loadbalance_arp_mon);
3808
3809                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3810                 if (bond->params.arp_validate)
3811                         bond_register_arp(bond);
3812         }
3813
3814         if (bond->params.mode == BOND_MODE_8023AD) {
3815                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3816                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3817                 /* register to receive LACPDUs */
3818                 bond_register_lacpdu(bond);
3819                 bond_3ad_initiate_agg_selection(bond, 1);
3820         }
3821
3822         return 0;
3823 }
3824
3825 static int bond_close(struct net_device *bond_dev)
3826 {
3827         struct bonding *bond = netdev_priv(bond_dev);
3828
3829         if (bond->params.mode == BOND_MODE_8023AD) {
3830                 /* Unregister the receive of LACPDUs */
3831                 bond_unregister_lacpdu(bond);
3832         }
3833
3834         if (bond->params.arp_validate)
3835                 bond_unregister_arp(bond);
3836
3837         write_lock_bh(&bond->lock);
3838
3839         bond->send_grat_arp = 0;
3840         bond->send_unsol_na = 0;
3841
3842         /* signal timers not to re-arm */
3843         bond->kill_timers = 1;
3844
3845         write_unlock_bh(&bond->lock);
3846
3847         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3848                 cancel_delayed_work(&bond->mii_work);
3849         }
3850
3851         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3852                 cancel_delayed_work(&bond->arp_work);
3853         }
3854
3855         switch (bond->params.mode) {
3856         case BOND_MODE_8023AD:
3857                 cancel_delayed_work(&bond->ad_work);
3858                 break;
3859         case BOND_MODE_TLB:
3860         case BOND_MODE_ALB:
3861                 cancel_delayed_work(&bond->alb_work);
3862                 break;
3863         default:
3864                 break;
3865         }
3866
3867
3868         if (bond_is_lb(bond)) {
3869                 /* Must be called only after all
3870                  * slaves have been released
3871                  */
3872                 bond_alb_deinitialize(bond);
3873         }
3874
3875         return 0;
3876 }
3877
3878 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3879 {
3880         struct bonding *bond = netdev_priv(bond_dev);
3881         struct net_device_stats *stats = &bond->stats;
3882         struct net_device_stats local_stats;
3883         struct slave *slave;
3884         int i;
3885
3886         memset(&local_stats, 0, sizeof(struct net_device_stats));
3887
3888         read_lock_bh(&bond->lock);
3889
3890         bond_for_each_slave(bond, slave, i) {
3891                 const struct net_device_stats *sstats = dev_get_stats(slave->dev);
3892
3893                 local_stats.rx_packets += sstats->rx_packets;
3894                 local_stats.rx_bytes += sstats->rx_bytes;
3895                 local_stats.rx_errors += sstats->rx_errors;
3896                 local_stats.rx_dropped += sstats->rx_dropped;
3897
3898                 local_stats.tx_packets += sstats->tx_packets;
3899                 local_stats.tx_bytes += sstats->tx_bytes;
3900                 local_stats.tx_errors += sstats->tx_errors;
3901                 local_stats.tx_dropped += sstats->tx_dropped;
3902
3903                 local_stats.multicast += sstats->multicast;
3904                 local_stats.collisions += sstats->collisions;
3905
3906                 local_stats.rx_length_errors += sstats->rx_length_errors;
3907                 local_stats.rx_over_errors += sstats->rx_over_errors;
3908                 local_stats.rx_crc_errors += sstats->rx_crc_errors;
3909                 local_stats.rx_frame_errors += sstats->rx_frame_errors;
3910                 local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
3911                 local_stats.rx_missed_errors += sstats->rx_missed_errors;
3912
3913                 local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
3914                 local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
3915                 local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
3916                 local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3917                 local_stats.tx_window_errors += sstats->tx_window_errors;
3918         }
3919
3920         memcpy(stats, &local_stats, sizeof(struct net_device_stats));
3921
3922         read_unlock_bh(&bond->lock);
3923
3924         return stats;
3925 }
3926
3927 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3928 {
3929         struct net_device *slave_dev = NULL;
3930         struct ifbond k_binfo;
3931         struct ifbond __user *u_binfo = NULL;
3932         struct ifslave k_sinfo;
3933         struct ifslave __user *u_sinfo = NULL;
3934         struct mii_ioctl_data *mii = NULL;
3935         int res = 0;
3936
3937         pr_debug("bond_ioctl: master=%s, cmd=%d\n",
3938                 bond_dev->name, cmd);
3939
3940         switch (cmd) {
3941         case SIOCGMIIPHY:
3942                 mii = if_mii(ifr);
3943                 if (!mii) {
3944                         return -EINVAL;
3945                 }
3946                 mii->phy_id = 0;
3947                 /* Fall Through */
3948         case SIOCGMIIREG:
3949                 /*
3950                  * We do this again just in case we were called by SIOCGMIIREG
3951                  * instead of SIOCGMIIPHY.
3952                  */
3953                 mii = if_mii(ifr);
3954                 if (!mii) {
3955                         return -EINVAL;
3956                 }
3957
3958                 if (mii->reg_num == 1) {
3959                         struct bonding *bond = netdev_priv(bond_dev);
3960                         mii->val_out = 0;
3961                         read_lock(&bond->lock);
3962                         read_lock(&bond->curr_slave_lock);
3963                         if (netif_carrier_ok(bond->dev)) {
3964                                 mii->val_out = BMSR_LSTATUS;
3965                         }
3966                         read_unlock(&bond->curr_slave_lock);
3967                         read_unlock(&bond->lock);
3968                 }
3969
3970                 return 0;
3971         case BOND_INFO_QUERY_OLD:
3972         case SIOCBONDINFOQUERY:
3973                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3974
3975                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3976                         return -EFAULT;
3977                 }
3978
3979                 res = bond_info_query(bond_dev, &k_binfo);
3980                 if (res == 0) {
3981                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3982                                 return -EFAULT;
3983                         }
3984                 }
3985
3986                 return res;
3987         case BOND_SLAVE_INFO_QUERY_OLD:
3988         case SIOCBONDSLAVEINFOQUERY:
3989                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3990
3991                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3992                         return -EFAULT;
3993                 }
3994
3995                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3996                 if (res == 0) {
3997                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3998                                 return -EFAULT;
3999                         }
4000                 }
4001
4002                 return res;
4003         default:
4004                 /* Go on */
4005                 break;
4006         }
4007
4008         if (!capable(CAP_NET_ADMIN)) {
4009                 return -EPERM;
4010         }
4011
4012         down_write(&(bonding_rwsem));
4013         slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
4014
4015         pr_debug("slave_dev=%p: \n", slave_dev);
4016
4017         if (!slave_dev) {
4018                 res = -ENODEV;
4019         } else {
4020                 pr_debug("slave_dev->name=%s: \n", slave_dev->name);
4021                 switch (cmd) {
4022                 case BOND_ENSLAVE_OLD:
4023                 case SIOCBONDENSLAVE:
4024                         res = bond_enslave(bond_dev, slave_dev);
4025                         break;
4026                 case BOND_RELEASE_OLD:
4027                 case SIOCBONDRELEASE:
4028                         res = bond_release(bond_dev, slave_dev);
4029                         break;
4030                 case BOND_SETHWADDR_OLD:
4031                 case SIOCBONDSETHWADDR:
4032                         res = bond_sethwaddr(bond_dev, slave_dev);
4033                         break;
4034                 case BOND_CHANGE_ACTIVE_OLD:
4035                 case SIOCBONDCHANGEACTIVE:
4036                         res = bond_ioctl_change_active(bond_dev, slave_dev);
4037                         break;
4038                 default:
4039                         res = -EOPNOTSUPP;
4040                 }
4041
4042                 dev_put(slave_dev);
4043         }
4044
4045         up_write(&(bonding_rwsem));
4046         return res;
4047 }
4048
4049 static void bond_set_multicast_list(struct net_device *bond_dev)
4050 {
4051         struct bonding *bond = netdev_priv(bond_dev);
4052         struct dev_mc_list *dmi;
4053
4054         /*
4055          * Do promisc before checking multicast_mode
4056          */
4057         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
4058                 /*
4059                  * FIXME: Need to handle the error when one of the multi-slaves
4060                  * encounters error.
4061                  */
4062                 bond_set_promiscuity(bond, 1);
4063         }
4064
4065         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
4066                 bond_set_promiscuity(bond, -1);
4067         }
4068
4069         /* set allmulti flag to slaves */
4070         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
4071                 /*
4072                  * FIXME: Need to handle the error when one of the multi-slaves
4073                  * encounters error.
4074                  */
4075                 bond_set_allmulti(bond, 1);
4076         }
4077
4078         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
4079                 bond_set_allmulti(bond, -1);
4080         }
4081
4082         read_lock(&bond->lock);
4083
4084         bond->flags = bond_dev->flags;
4085
4086         /* looking for addresses to add to slaves' mc list */
4087         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
4088                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
4089                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4090                 }
4091         }
4092
4093         /* looking for addresses to delete from slaves' list */
4094         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
4095                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
4096                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4097                 }
4098         }
4099
4100         /* save master's multicast list */
4101         bond_mc_list_destroy(bond);
4102         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
4103
4104         read_unlock(&bond->lock);
4105 }
4106
4107 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
4108 {
4109         struct bonding *bond = netdev_priv(dev);
4110         struct slave *slave = bond->first_slave;
4111
4112         if (slave) {
4113                 const struct net_device_ops *slave_ops
4114                         = slave->dev->netdev_ops;
4115                 if (slave_ops->ndo_neigh_setup)
4116                         return slave_ops->ndo_neigh_setup(dev, parms);
4117         }
4118         return 0;
4119 }
4120
4121 /*
4122  * Change the MTU of all of a master's slaves to match the master
4123  */
4124 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4125 {
4126         struct bonding *bond = netdev_priv(bond_dev);
4127         struct slave *slave, *stop_at;
4128         int res = 0;
4129         int i;
4130
4131         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
4132                 (bond_dev ? bond_dev->name : "None"), new_mtu);
4133
4134         /* Can't hold bond->lock with bh disabled here since
4135          * some base drivers panic. On the other hand we can't
4136          * hold bond->lock without bh disabled because we'll
4137          * deadlock. The only solution is to rely on the fact
4138          * that we're under rtnl_lock here, and the slaves
4139          * list won't change. This doesn't solve the problem
4140          * of setting the slave's MTU while it is
4141          * transmitting, but the assumption is that the base
4142          * driver can handle that.
4143          *
4144          * TODO: figure out a way to safely iterate the slaves
4145          * list, but without holding a lock around the actual
4146          * call to the base driver.
4147          */
4148
4149         bond_for_each_slave(bond, slave, i) {
4150                 pr_debug("s %p s->p %p c_m %p\n", slave,
4151                         slave->prev, slave->dev->change_mtu);
4152
4153                 res = dev_set_mtu(slave->dev, new_mtu);
4154
4155                 if (res) {
4156                         /* If we failed to set the slave's mtu to the new value
4157                          * we must abort the operation even in ACTIVE_BACKUP
4158                          * mode, because if we allow the backup slaves to have
4159                          * different mtu values than the active slave we'll
4160                          * need to change their mtu when doing a failover. That
4161                          * means changing their mtu from timer context, which
4162                          * is probably not a good idea.
4163                          */
4164                         pr_debug("err %d %s\n", res, slave->dev->name);
4165                         goto unwind;
4166                 }
4167         }
4168
4169         bond_dev->mtu = new_mtu;
4170
4171         return 0;
4172
4173 unwind:
4174         /* unwind from head to the slave that failed */
4175         stop_at = slave;
4176         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4177                 int tmp_res;
4178
4179                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4180                 if (tmp_res) {
4181                         pr_debug("unwind err %d dev %s\n", tmp_res,
4182                                 slave->dev->name);
4183                 }
4184         }
4185
4186         return res;
4187 }
4188
4189 /*
4190  * Change HW address
4191  *
4192  * Note that many devices must be down to change the HW address, and
4193  * downing the master releases all slaves.  We can make bonds full of
4194  * bonding devices to test this, however.
4195  */
4196 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4197 {
4198         struct bonding *bond = netdev_priv(bond_dev);
4199         struct sockaddr *sa = addr, tmp_sa;
4200         struct slave *slave, *stop_at;
4201         int res = 0;
4202         int i;
4203
4204         if (bond->params.mode == BOND_MODE_ALB)
4205                 return bond_alb_set_mac_address(bond_dev, addr);
4206
4207
4208         pr_debug("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
4209
4210         /*
4211          * If fail_over_mac is set to active, do nothing and return
4212          * success.  Returning an error causes ifenslave to fail.
4213          */
4214         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4215                 return 0;
4216
4217         if (!is_valid_ether_addr(sa->sa_data)) {
4218                 return -EADDRNOTAVAIL;
4219         }
4220
4221         /* Can't hold bond->lock with bh disabled here since
4222          * some base drivers panic. On the other hand we can't
4223          * hold bond->lock without bh disabled because we'll
4224          * deadlock. The only solution is to rely on the fact
4225          * that we're under rtnl_lock here, and the slaves
4226          * list won't change. This doesn't solve the problem
4227          * of setting the slave's hw address while it is
4228          * transmitting, but the assumption is that the base
4229          * driver can handle that.
4230          *
4231          * TODO: figure out a way to safely iterate the slaves
4232          * list, but without holding a lock around the actual
4233          * call to the base driver.
4234          */
4235
4236         bond_for_each_slave(bond, slave, i) {
4237                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4238                 pr_debug("slave %p %s\n", slave, slave->dev->name);
4239
4240                 if (slave_ops->ndo_set_mac_address == NULL) {
4241                         res = -EOPNOTSUPP;
4242                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4243                         goto unwind;
4244                 }
4245
4246                 res = dev_set_mac_address(slave->dev, addr);
4247                 if (res) {
4248                         /* TODO: consider downing the slave
4249                          * and retry ?
4250                          * User should expect communications
4251                          * breakage anyway until ARP finish
4252                          * updating, so...
4253                          */
4254                         pr_debug("err %d %s\n", res, slave->dev->name);
4255                         goto unwind;
4256                 }
4257         }
4258
4259         /* success */
4260         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4261         return 0;
4262
4263 unwind:
4264         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4265         tmp_sa.sa_family = bond_dev->type;
4266
4267         /* unwind from head to the slave that failed */
4268         stop_at = slave;
4269         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4270                 int tmp_res;
4271
4272                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4273                 if (tmp_res) {
4274                         pr_debug("unwind err %d dev %s\n", tmp_res,
4275                                 slave->dev->name);
4276                 }
4277         }
4278
4279         return res;
4280 }
4281
4282 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4283 {
4284         struct bonding *bond = netdev_priv(bond_dev);
4285         struct slave *slave, *start_at;
4286         int i, slave_no, res = 1;
4287
4288         read_lock(&bond->lock);
4289
4290         if (!BOND_IS_OK(bond)) {
4291                 goto out;
4292         }
4293
4294         /*
4295          * Concurrent TX may collide on rr_tx_counter; we accept that
4296          * as being rare enough not to justify using an atomic op here
4297          */
4298         slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4299
4300         bond_for_each_slave(bond, slave, i) {
4301                 slave_no--;
4302                 if (slave_no < 0) {
4303                         break;
4304                 }
4305         }
4306
4307         start_at = slave;
4308         bond_for_each_slave_from(bond, slave, i, start_at) {
4309                 if (IS_UP(slave->dev) &&
4310                     (slave->link == BOND_LINK_UP) &&
4311                     (slave->state == BOND_STATE_ACTIVE)) {
4312                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4313                         break;
4314                 }
4315         }
4316
4317 out:
4318         if (res) {
4319                 /* no suitable interface, frame not sent */
4320                 dev_kfree_skb(skb);
4321         }
4322         read_unlock(&bond->lock);
4323         return 0;
4324 }
4325
4326
4327 /*
4328  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4329  * the bond has a usable interface.
4330  */
4331 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4332 {
4333         struct bonding *bond = netdev_priv(bond_dev);
4334         int res = 1;
4335
4336         read_lock(&bond->lock);
4337         read_lock(&bond->curr_slave_lock);
4338
4339         if (!BOND_IS_OK(bond)) {
4340                 goto out;
4341         }
4342
4343         if (!bond->curr_active_slave)
4344                 goto out;
4345
4346         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4347
4348 out:
4349         if (res) {
4350                 /* no suitable interface, frame not sent */
4351                 dev_kfree_skb(skb);
4352         }
4353         read_unlock(&bond->curr_slave_lock);
4354         read_unlock(&bond->lock);
4355         return 0;
4356 }
4357
4358 /*
4359  * In bond_xmit_xor() , we determine the output device by using a pre-
4360  * determined xmit_hash_policy(), If the selected device is not enabled,
4361  * find the next active slave.
4362  */
4363 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4364 {
4365         struct bonding *bond = netdev_priv(bond_dev);
4366         struct slave *slave, *start_at;
4367         int slave_no;
4368         int i;
4369         int res = 1;
4370
4371         read_lock(&bond->lock);
4372
4373         if (!BOND_IS_OK(bond)) {
4374                 goto out;
4375         }
4376
4377         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4378
4379         bond_for_each_slave(bond, slave, i) {
4380                 slave_no--;
4381                 if (slave_no < 0) {
4382                         break;
4383                 }
4384         }
4385
4386         start_at = slave;
4387
4388         bond_for_each_slave_from(bond, slave, i, start_at) {
4389                 if (IS_UP(slave->dev) &&
4390                     (slave->link == BOND_LINK_UP) &&
4391                     (slave->state == BOND_STATE_ACTIVE)) {
4392                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4393                         break;
4394                 }
4395         }
4396
4397 out:
4398         if (res) {
4399                 /* no suitable interface, frame not sent */
4400                 dev_kfree_skb(skb);
4401         }
4402         read_unlock(&bond->lock);
4403         return 0;
4404 }
4405
4406 /*
4407  * in broadcast mode, we send everything to all usable interfaces.
4408  */
4409 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4410 {
4411         struct bonding *bond = netdev_priv(bond_dev);
4412         struct slave *slave, *start_at;
4413         struct net_device *tx_dev = NULL;
4414         int i;
4415         int res = 1;
4416
4417         read_lock(&bond->lock);
4418
4419         if (!BOND_IS_OK(bond)) {
4420                 goto out;
4421         }
4422
4423         read_lock(&bond->curr_slave_lock);
4424         start_at = bond->curr_active_slave;
4425         read_unlock(&bond->curr_slave_lock);
4426
4427         if (!start_at) {
4428                 goto out;
4429         }
4430
4431         bond_for_each_slave_from(bond, slave, i, start_at) {
4432                 if (IS_UP(slave->dev) &&
4433                     (slave->link == BOND_LINK_UP) &&
4434                     (slave->state == BOND_STATE_ACTIVE)) {
4435                         if (tx_dev) {
4436                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4437                                 if (!skb2) {
4438                                         printk(KERN_ERR DRV_NAME
4439                                                ": %s: Error: bond_xmit_broadcast(): "
4440                                                "skb_clone() failed\n",
4441                                                bond_dev->name);
4442                                         continue;
4443                                 }
4444
4445                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4446                                 if (res) {
4447                                         dev_kfree_skb(skb2);
4448                                         continue;
4449                                 }
4450                         }
4451                         tx_dev = slave->dev;
4452                 }
4453         }
4454
4455         if (tx_dev) {
4456                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4457         }
4458
4459 out:
4460         if (res) {
4461                 /* no suitable interface, frame not sent */
4462                 dev_kfree_skb(skb);
4463         }
4464         /* frame sent to all suitable interfaces */
4465         read_unlock(&bond->lock);
4466         return 0;
4467 }
4468
4469 /*------------------------- Device initialization ---------------------------*/
4470
4471 static void bond_set_xmit_hash_policy(struct bonding *bond)
4472 {
4473         switch (bond->params.xmit_policy) {
4474         case BOND_XMIT_POLICY_LAYER23:
4475                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4476                 break;
4477         case BOND_XMIT_POLICY_LAYER34:
4478                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4479                 break;
4480         case BOND_XMIT_POLICY_LAYER2:
4481         default:
4482                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4483                 break;
4484         }
4485 }
4486
4487 static int bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4488 {
4489         const struct bonding *bond = netdev_priv(dev);
4490
4491         switch (bond->params.mode) {
4492         case BOND_MODE_ROUNDROBIN:
4493                 return bond_xmit_roundrobin(skb, dev);
4494         case BOND_MODE_ACTIVEBACKUP:
4495                 return bond_xmit_activebackup(skb, dev);
4496         case BOND_MODE_XOR:
4497                 return bond_xmit_xor(skb, dev);
4498         case BOND_MODE_BROADCAST:
4499                 return bond_xmit_broadcast(skb, dev);
4500         case BOND_MODE_8023AD:
4501                 return bond_3ad_xmit_xor(skb, dev);
4502         case BOND_MODE_ALB:
4503         case BOND_MODE_TLB:
4504                 return bond_alb_xmit(skb, dev);
4505         default:
4506                 /* Should never happen, mode already checked */
4507                 printk(KERN_ERR DRV_NAME ": %s: Error: Unknown bonding mode %d\n",
4508                      dev->name, bond->params.mode);
4509                 WARN_ON_ONCE(1);
4510                 dev_kfree_skb(skb);
4511                 return NETDEV_TX_OK;
4512         }
4513 }
4514
4515
4516 /*
4517  * set bond mode specific net device operations
4518  */
4519 void bond_set_mode_ops(struct bonding *bond, int mode)
4520 {
4521         struct net_device *bond_dev = bond->dev;
4522
4523         switch (mode) {
4524         case BOND_MODE_ROUNDROBIN:
4525                 break;
4526         case BOND_MODE_ACTIVEBACKUP:
4527                 break;
4528         case BOND_MODE_XOR:
4529                 bond_set_xmit_hash_policy(bond);
4530                 break;
4531         case BOND_MODE_BROADCAST:
4532                 break;
4533         case BOND_MODE_8023AD:
4534                 bond_set_master_3ad_flags(bond);
4535                 bond_set_xmit_hash_policy(bond);
4536                 break;
4537         case BOND_MODE_ALB:
4538                 bond_set_master_alb_flags(bond);
4539                 /* FALLTHRU */
4540         case BOND_MODE_TLB:
4541                 break;
4542         default:
4543                 /* Should never happen, mode already checked */
4544                 printk(KERN_ERR DRV_NAME
4545                        ": %s: Error: Unknown bonding mode %d\n",
4546                        bond_dev->name,
4547                        mode);
4548                 break;
4549         }
4550 }
4551
4552 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4553                                     struct ethtool_drvinfo *drvinfo)
4554 {
4555         strncpy(drvinfo->driver, DRV_NAME, 32);
4556         strncpy(drvinfo->version, DRV_VERSION, 32);
4557         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4558 }
4559
4560 static const struct ethtool_ops bond_ethtool_ops = {
4561         .get_drvinfo            = bond_ethtool_get_drvinfo,
4562         .get_link               = ethtool_op_get_link,
4563         .get_tx_csum            = ethtool_op_get_tx_csum,
4564         .get_sg                 = ethtool_op_get_sg,
4565         .get_tso                = ethtool_op_get_tso,
4566         .get_ufo                = ethtool_op_get_ufo,
4567         .get_flags              = ethtool_op_get_flags,
4568 };
4569
4570 static const struct net_device_ops bond_netdev_ops = {
4571         .ndo_open               = bond_open,
4572         .ndo_stop               = bond_close,
4573         .ndo_start_xmit         = bond_start_xmit,
4574         .ndo_get_stats          = bond_get_stats,
4575         .ndo_do_ioctl           = bond_do_ioctl,
4576         .ndo_set_multicast_list = bond_set_multicast_list,
4577         .ndo_change_mtu         = bond_change_mtu,
4578         .ndo_set_mac_address    = bond_set_mac_address,
4579         .ndo_neigh_setup        = bond_neigh_setup,
4580         .ndo_vlan_rx_register   = bond_vlan_rx_register,
4581         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4582         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4583 };
4584
4585 /*
4586  * Does not allocate but creates a /proc entry.
4587  * Allowed to fail.
4588  */
4589 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4590 {
4591         struct bonding *bond = netdev_priv(bond_dev);
4592
4593         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4594
4595         /* initialize rwlocks */
4596         rwlock_init(&bond->lock);
4597         rwlock_init(&bond->curr_slave_lock);
4598
4599         bond->params = *params; /* copy params struct */
4600
4601         bond->wq = create_singlethread_workqueue(bond_dev->name);
4602         if (!bond->wq)
4603                 return -ENOMEM;
4604
4605         /* Initialize pointers */
4606         bond->first_slave = NULL;
4607         bond->curr_active_slave = NULL;
4608         bond->current_arp_slave = NULL;
4609         bond->primary_slave = NULL;
4610         bond->dev = bond_dev;
4611         bond->send_grat_arp = 0;
4612         bond->send_unsol_na = 0;
4613         bond->setup_by_slave = 0;
4614         INIT_LIST_HEAD(&bond->vlan_list);
4615
4616         /* Initialize the device entry points */
4617         bond_dev->netdev_ops = &bond_netdev_ops;
4618         bond_dev->ethtool_ops = &bond_ethtool_ops;
4619         bond_set_mode_ops(bond, bond->params.mode);
4620
4621         bond_dev->destructor = bond_destructor;
4622
4623         /* Initialize the device options */
4624         bond_dev->tx_queue_len = 0;
4625         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4626         bond_dev->priv_flags |= IFF_BONDING;
4627         if (bond->params.arp_interval)
4628                 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4629
4630         /* At first, we block adding VLANs. That's the only way to
4631          * prevent problems that occur when adding VLANs over an
4632          * empty bond. The block will be removed once non-challenged
4633          * slaves are enslaved.
4634          */
4635         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4636
4637         /* don't acquire bond device's netif_tx_lock when
4638          * transmitting */
4639         bond_dev->features |= NETIF_F_LLTX;
4640
4641         /* By default, we declare the bond to be fully
4642          * VLAN hardware accelerated capable. Special
4643          * care is taken in the various xmit functions
4644          * when there are slaves that are not hw accel
4645          * capable
4646          */
4647         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4648                                NETIF_F_HW_VLAN_RX |
4649                                NETIF_F_HW_VLAN_FILTER);
4650
4651 #ifdef CONFIG_PROC_FS
4652         bond_create_proc_entry(bond);
4653 #endif
4654         list_add_tail(&bond->bond_list, &bond_dev_list);
4655
4656         return 0;
4657 }
4658
4659 static void bond_work_cancel_all(struct bonding *bond)
4660 {
4661         write_lock_bh(&bond->lock);
4662         bond->kill_timers = 1;
4663         write_unlock_bh(&bond->lock);
4664
4665         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4666                 cancel_delayed_work(&bond->mii_work);
4667
4668         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4669                 cancel_delayed_work(&bond->arp_work);
4670
4671         if (bond->params.mode == BOND_MODE_ALB &&
4672             delayed_work_pending(&bond->alb_work))
4673                 cancel_delayed_work(&bond->alb_work);
4674
4675         if (bond->params.mode == BOND_MODE_8023AD &&
4676             delayed_work_pending(&bond->ad_work))
4677                 cancel_delayed_work(&bond->ad_work);
4678 }
4679
4680 /* De-initialize device specific data.
4681  * Caller must hold rtnl_lock.
4682  */
4683 static void bond_deinit(struct net_device *bond_dev)
4684 {
4685         struct bonding *bond = netdev_priv(bond_dev);
4686
4687         list_del(&bond->bond_list);
4688
4689         bond_work_cancel_all(bond);
4690
4691 #ifdef CONFIG_PROC_FS
4692         bond_remove_proc_entry(bond);
4693 #endif
4694 }
4695
4696 /* Unregister and free all bond devices.
4697  * Caller must hold rtnl_lock.
4698  */
4699 static void bond_free_all(void)
4700 {
4701         struct bonding *bond, *nxt;
4702
4703         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4704                 struct net_device *bond_dev = bond->dev;
4705
4706                 bond_work_cancel_all(bond);
4707                 /* Release the bonded slaves */
4708                 bond_release_all(bond_dev);
4709                 bond_destroy(bond);
4710         }
4711
4712 #ifdef CONFIG_PROC_FS
4713         bond_destroy_proc_dir();
4714 #endif
4715 }
4716
4717 /*------------------------- Module initialization ---------------------------*/
4718
4719 /*
4720  * Convert string input module parms.  Accept either the
4721  * number of the mode or its string name.  A bit complicated because
4722  * some mode names are substrings of other names, and calls from sysfs
4723  * may have whitespace in the name (trailing newlines, for example).
4724  */
4725 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4726 {
4727         int mode = -1, i, rv;
4728         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4729
4730         for (p = (char *)buf; *p; p++)
4731                 if (!(isdigit(*p) || isspace(*p)))
4732                         break;
4733
4734         if (*p)
4735                 rv = sscanf(buf, "%20s", modestr);
4736         else
4737                 rv = sscanf(buf, "%d", &mode);
4738
4739         if (!rv)
4740                 return -1;
4741
4742         for (i = 0; tbl[i].modename; i++) {
4743                 if (mode == tbl[i].mode)
4744                         return tbl[i].mode;
4745                 if (strcmp(modestr, tbl[i].modename) == 0)
4746                         return tbl[i].mode;
4747         }
4748
4749         return -1;
4750 }
4751
4752 static int bond_check_params(struct bond_params *params)
4753 {
4754         int arp_validate_value, fail_over_mac_value;
4755
4756         /*
4757          * Convert string parameters.
4758          */
4759         if (mode) {
4760                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4761                 if (bond_mode == -1) {
4762                         printk(KERN_ERR DRV_NAME
4763                                ": Error: Invalid bonding mode \"%s\"\n",
4764                                mode == NULL ? "NULL" : mode);
4765                         return -EINVAL;
4766                 }
4767         }
4768
4769         if (xmit_hash_policy) {
4770                 if ((bond_mode != BOND_MODE_XOR) &&
4771                     (bond_mode != BOND_MODE_8023AD)) {
4772                         printk(KERN_INFO DRV_NAME
4773                                ": xor_mode param is irrelevant in mode %s\n",
4774                                bond_mode_name(bond_mode));
4775                 } else {
4776                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4777                                                         xmit_hashtype_tbl);
4778                         if (xmit_hashtype == -1) {
4779                                 printk(KERN_ERR DRV_NAME
4780                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4781                                 xmit_hash_policy == NULL ? "NULL" :
4782                                        xmit_hash_policy);
4783                                 return -EINVAL;
4784                         }
4785                 }
4786         }
4787
4788         if (lacp_rate) {
4789                 if (bond_mode != BOND_MODE_8023AD) {
4790                         printk(KERN_INFO DRV_NAME
4791                                ": lacp_rate param is irrelevant in mode %s\n",
4792                                bond_mode_name(bond_mode));
4793                 } else {
4794                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4795                         if (lacp_fast == -1) {
4796                                 printk(KERN_ERR DRV_NAME
4797                                        ": Error: Invalid lacp rate \"%s\"\n",
4798                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4799                                 return -EINVAL;
4800                         }
4801                 }
4802         }
4803
4804         if (ad_select) {
4805                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4806                 if (params->ad_select == -1) {
4807                         printk(KERN_ERR DRV_NAME
4808                                ": Error: Invalid ad_select \"%s\"\n",
4809                                ad_select == NULL ? "NULL" : ad_select);
4810                         return -EINVAL;
4811                 }
4812
4813                 if (bond_mode != BOND_MODE_8023AD) {
4814                         printk(KERN_WARNING DRV_NAME
4815                                ": ad_select param only affects 802.3ad mode\n");
4816                 }
4817         } else {
4818                 params->ad_select = BOND_AD_STABLE;
4819         }
4820
4821         if (max_bonds < 0 || max_bonds > INT_MAX) {
4822                 printk(KERN_WARNING DRV_NAME
4823                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4824                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4825                        max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4826                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4827         }
4828
4829         if (miimon < 0) {
4830                 printk(KERN_WARNING DRV_NAME
4831                        ": Warning: miimon module parameter (%d), "
4832                        "not in range 0-%d, so it was reset to %d\n",
4833                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4834                 miimon = BOND_LINK_MON_INTERV;
4835         }
4836
4837         if (updelay < 0) {
4838                 printk(KERN_WARNING DRV_NAME
4839                        ": Warning: updelay module parameter (%d), "
4840                        "not in range 0-%d, so it was reset to 0\n",
4841                        updelay, INT_MAX);
4842                 updelay = 0;
4843         }
4844
4845         if (downdelay < 0) {
4846                 printk(KERN_WARNING DRV_NAME
4847                        ": Warning: downdelay module parameter (%d), "
4848                        "not in range 0-%d, so it was reset to 0\n",
4849                        downdelay, INT_MAX);
4850                 downdelay = 0;
4851         }
4852
4853         if ((use_carrier != 0) && (use_carrier != 1)) {
4854                 printk(KERN_WARNING DRV_NAME
4855                        ": Warning: use_carrier module parameter (%d), "
4856                        "not of valid value (0/1), so it was set to 1\n",
4857                        use_carrier);
4858                 use_carrier = 1;
4859         }
4860
4861         if (num_grat_arp < 0 || num_grat_arp > 255) {
4862                 printk(KERN_WARNING DRV_NAME
4863                        ": Warning: num_grat_arp (%d) not in range 0-255 so it "
4864                        "was reset to 1 \n", num_grat_arp);
4865                 num_grat_arp = 1;
4866         }
4867
4868         if (num_unsol_na < 0 || num_unsol_na > 255) {
4869                 printk(KERN_WARNING DRV_NAME
4870                        ": Warning: num_unsol_na (%d) not in range 0-255 so it "
4871                        "was reset to 1 \n", num_unsol_na);
4872                 num_unsol_na = 1;
4873         }
4874
4875         /* reset values for 802.3ad */
4876         if (bond_mode == BOND_MODE_8023AD) {
4877                 if (!miimon) {
4878                         printk(KERN_WARNING DRV_NAME
4879                                ": Warning: miimon must be specified, "
4880                                "otherwise bonding will not detect link "
4881                                "failure, speed and duplex which are "
4882                                "essential for 802.3ad operation\n");
4883                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4884                         miimon = 100;
4885                 }
4886         }
4887
4888         /* reset values for TLB/ALB */
4889         if ((bond_mode == BOND_MODE_TLB) ||
4890             (bond_mode == BOND_MODE_ALB)) {
4891                 if (!miimon) {
4892                         printk(KERN_WARNING DRV_NAME
4893                                ": Warning: miimon must be specified, "
4894                                "otherwise bonding will not detect link "
4895                                "failure and link speed which are essential "
4896                                "for TLB/ALB load balancing\n");
4897                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4898                         miimon = 100;
4899                 }
4900         }
4901
4902         if (bond_mode == BOND_MODE_ALB) {
4903                 printk(KERN_NOTICE DRV_NAME
4904                        ": In ALB mode you might experience client "
4905                        "disconnections upon reconnection of a link if the "
4906                        "bonding module updelay parameter (%d msec) is "
4907                        "incompatible with the forwarding delay time of the "
4908                        "switch\n",
4909                        updelay);
4910         }
4911
4912         if (!miimon) {
4913                 if (updelay || downdelay) {
4914                         /* just warn the user the up/down delay will have
4915                          * no effect since miimon is zero...
4916                          */
4917                         printk(KERN_WARNING DRV_NAME
4918                                ": Warning: miimon module parameter not set "
4919                                "and updelay (%d) or downdelay (%d) module "
4920                                "parameter is set; updelay and downdelay have "
4921                                "no effect unless miimon is set\n",
4922                                updelay, downdelay);
4923                 }
4924         } else {
4925                 /* don't allow arp monitoring */
4926                 if (arp_interval) {
4927                         printk(KERN_WARNING DRV_NAME
4928                                ": Warning: miimon (%d) and arp_interval (%d) "
4929                                "can't be used simultaneously, disabling ARP "
4930                                "monitoring\n",
4931                                miimon, arp_interval);
4932                         arp_interval = 0;
4933                 }
4934
4935                 if ((updelay % miimon) != 0) {
4936                         printk(KERN_WARNING DRV_NAME
4937                                ": Warning: updelay (%d) is not a multiple "
4938                                "of miimon (%d), updelay rounded to %d ms\n",
4939                                updelay, miimon, (updelay / miimon) * miimon);
4940                 }
4941
4942                 updelay /= miimon;
4943
4944                 if ((downdelay % miimon) != 0) {
4945                         printk(KERN_WARNING DRV_NAME
4946                                ": Warning: downdelay (%d) is not a multiple "
4947                                "of miimon (%d), downdelay rounded to %d ms\n",
4948                                downdelay, miimon,
4949                                (downdelay / miimon) * miimon);
4950                 }
4951
4952                 downdelay /= miimon;
4953         }
4954
4955         if (arp_interval < 0) {
4956                 printk(KERN_WARNING DRV_NAME
4957                        ": Warning: arp_interval module parameter (%d) "
4958                        ", not in range 0-%d, so it was reset to %d\n",
4959                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4960                 arp_interval = BOND_LINK_ARP_INTERV;
4961         }
4962
4963         for (arp_ip_count = 0;
4964              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4965              arp_ip_count++) {
4966                 /* not complete check, but should be good enough to
4967                    catch mistakes */
4968                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4969                         printk(KERN_WARNING DRV_NAME
4970                                ": Warning: bad arp_ip_target module parameter "
4971                                "(%s), ARP monitoring will not be performed\n",
4972                                arp_ip_target[arp_ip_count]);
4973                         arp_interval = 0;
4974                 } else {
4975                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4976                         arp_target[arp_ip_count] = ip;
4977                 }
4978         }
4979
4980         if (arp_interval && !arp_ip_count) {
4981                 /* don't allow arping if no arp_ip_target given... */
4982                 printk(KERN_WARNING DRV_NAME
4983                        ": Warning: arp_interval module parameter (%d) "
4984                        "specified without providing an arp_ip_target "
4985                        "parameter, arp_interval was reset to 0\n",
4986                        arp_interval);
4987                 arp_interval = 0;
4988         }
4989
4990         if (arp_validate) {
4991                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4992                         printk(KERN_ERR DRV_NAME
4993                ": arp_validate only supported in active-backup mode\n");
4994                         return -EINVAL;
4995                 }
4996                 if (!arp_interval) {
4997                         printk(KERN_ERR DRV_NAME
4998                                ": arp_validate requires arp_interval\n");
4999                         return -EINVAL;
5000                 }
5001
5002                 arp_validate_value = bond_parse_parm(arp_validate,
5003                                                      arp_validate_tbl);
5004                 if (arp_validate_value == -1) {
5005                         printk(KERN_ERR DRV_NAME
5006                                ": Error: invalid arp_validate \"%s\"\n",
5007                                arp_validate == NULL ? "NULL" : arp_validate);
5008                         return -EINVAL;
5009                 }
5010         } else
5011                 arp_validate_value = 0;
5012
5013         if (miimon) {
5014                 printk(KERN_INFO DRV_NAME
5015                        ": MII link monitoring set to %d ms\n",
5016                        miimon);
5017         } else if (arp_interval) {
5018                 int i;
5019
5020                 printk(KERN_INFO DRV_NAME
5021                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
5022                        arp_interval,
5023                        arp_validate_tbl[arp_validate_value].modename,
5024                        arp_ip_count);
5025
5026                 for (i = 0; i < arp_ip_count; i++)
5027                         printk (" %s", arp_ip_target[i]);
5028
5029                 printk("\n");
5030
5031         } else if (max_bonds) {
5032                 /* miimon and arp_interval not set, we need one so things
5033                  * work as expected, see bonding.txt for details
5034                  */
5035                 printk(KERN_WARNING DRV_NAME
5036                        ": Warning: either miimon or arp_interval and "
5037                        "arp_ip_target module parameters must be specified, "
5038                        "otherwise bonding will not detect link failures! see "
5039                        "bonding.txt for details.\n");
5040         }
5041
5042         if (primary && !USES_PRIMARY(bond_mode)) {
5043                 /* currently, using a primary only makes sense
5044                  * in active backup, TLB or ALB modes
5045                  */
5046                 printk(KERN_WARNING DRV_NAME
5047                        ": Warning: %s primary device specified but has no "
5048                        "effect in %s mode\n",
5049                        primary, bond_mode_name(bond_mode));
5050                 primary = NULL;
5051         }
5052
5053         if (fail_over_mac) {
5054                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
5055                                                       fail_over_mac_tbl);
5056                 if (fail_over_mac_value == -1) {
5057                         printk(KERN_ERR DRV_NAME
5058                                ": Error: invalid fail_over_mac \"%s\"\n",
5059                                arp_validate == NULL ? "NULL" : arp_validate);
5060                         return -EINVAL;
5061                 }
5062
5063                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5064                         printk(KERN_WARNING DRV_NAME
5065                                ": Warning: fail_over_mac only affects "
5066                                "active-backup mode.\n");
5067         } else {
5068                 fail_over_mac_value = BOND_FOM_NONE;
5069         }
5070
5071         /* fill params struct with the proper values */
5072         params->mode = bond_mode;
5073         params->xmit_policy = xmit_hashtype;
5074         params->miimon = miimon;
5075         params->num_grat_arp = num_grat_arp;
5076         params->num_unsol_na = num_unsol_na;
5077         params->arp_interval = arp_interval;
5078         params->arp_validate = arp_validate_value;
5079         params->updelay = updelay;
5080         params->downdelay = downdelay;
5081         params->use_carrier = use_carrier;
5082         params->lacp_fast = lacp_fast;
5083         params->primary[0] = 0;
5084         params->fail_over_mac = fail_over_mac_value;
5085
5086         if (primary) {
5087                 strncpy(params->primary, primary, IFNAMSIZ);
5088                 params->primary[IFNAMSIZ - 1] = 0;
5089         }
5090
5091         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5092
5093         return 0;
5094 }
5095
5096 static struct lock_class_key bonding_netdev_xmit_lock_key;
5097 static struct lock_class_key bonding_netdev_addr_lock_key;
5098
5099 static void bond_set_lockdep_class_one(struct net_device *dev,
5100                                        struct netdev_queue *txq,
5101                                        void *_unused)
5102 {
5103         lockdep_set_class(&txq->_xmit_lock,
5104                           &bonding_netdev_xmit_lock_key);
5105 }
5106
5107 static void bond_set_lockdep_class(struct net_device *dev)
5108 {
5109         lockdep_set_class(&dev->addr_list_lock,
5110                           &bonding_netdev_addr_lock_key);
5111         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
5112 }
5113
5114 /* Create a new bond based on the specified name and bonding parameters.
5115  * If name is NULL, obtain a suitable "bond%d" name for us.
5116  * Caller must NOT hold rtnl_lock; we need to release it here before we
5117  * set up our sysfs entries.
5118  */
5119 int bond_create(char *name, struct bond_params *params)
5120 {
5121         struct net_device *bond_dev;
5122         struct bonding *bond;
5123         int res;
5124
5125         rtnl_lock();
5126         down_write(&bonding_rwsem);
5127
5128         /* Check to see if the bond already exists. */
5129         if (name) {
5130                 list_for_each_entry(bond, &bond_dev_list, bond_list)
5131                         if (strnicmp(bond->dev->name, name, IFNAMSIZ) == 0) {
5132                                 printk(KERN_ERR DRV_NAME
5133                                ": cannot add bond %s; it already exists\n",
5134                                        name);
5135                                 res = -EPERM;
5136                                 goto out_rtnl;
5137                         }
5138         }
5139
5140         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
5141                                 ether_setup);
5142         if (!bond_dev) {
5143                 printk(KERN_ERR DRV_NAME
5144                        ": %s: eek! can't alloc netdev!\n",
5145                        name);
5146                 res = -ENOMEM;
5147                 goto out_rtnl;
5148         }
5149
5150         if (!name) {
5151                 res = dev_alloc_name(bond_dev, "bond%d");
5152                 if (res < 0)
5153                         goto out_netdev;
5154         }
5155
5156         /* bond_init() must be called after dev_alloc_name() (for the
5157          * /proc files), but before register_netdevice(), because we
5158          * need to set function pointers.
5159          */
5160
5161         res = bond_init(bond_dev, params);
5162         if (res < 0) {
5163                 goto out_netdev;
5164         }
5165
5166         res = register_netdevice(bond_dev);
5167         if (res < 0) {
5168                 goto out_bond;
5169         }
5170
5171         bond_set_lockdep_class(bond_dev);
5172
5173         netif_carrier_off(bond_dev);
5174
5175         up_write(&bonding_rwsem);
5176         rtnl_unlock(); /* allows sysfs registration of net device */
5177         res = bond_create_sysfs_entry(netdev_priv(bond_dev));
5178         if (res < 0) {
5179                 rtnl_lock();
5180                 down_write(&bonding_rwsem);
5181                 bond_deinit(bond_dev);
5182                 unregister_netdevice(bond_dev);
5183                 goto out_rtnl;
5184         }
5185
5186         return 0;
5187
5188 out_bond:
5189         bond_deinit(bond_dev);
5190 out_netdev:
5191         free_netdev(bond_dev);
5192 out_rtnl:
5193         up_write(&bonding_rwsem);
5194         rtnl_unlock();
5195         return res;
5196 }
5197
5198 static int __init bonding_init(void)
5199 {
5200         int i;
5201         int res;
5202         struct bonding *bond;
5203
5204         printk(KERN_INFO "%s", version);
5205
5206         res = bond_check_params(&bonding_defaults);
5207         if (res) {
5208                 goto out;
5209         }
5210
5211 #ifdef CONFIG_PROC_FS
5212         bond_create_proc_dir();
5213 #endif
5214
5215         init_rwsem(&bonding_rwsem);
5216
5217         for (i = 0; i < max_bonds; i++) {
5218                 res = bond_create(NULL, &bonding_defaults);
5219                 if (res)
5220                         goto err;
5221         }
5222
5223         res = bond_create_sysfs();
5224         if (res)
5225                 goto err;
5226
5227         register_netdevice_notifier(&bond_netdev_notifier);
5228         register_inetaddr_notifier(&bond_inetaddr_notifier);
5229         bond_register_ipv6_notifier();
5230
5231         goto out;
5232 err:
5233         list_for_each_entry(bond, &bond_dev_list, bond_list) {
5234                 bond_work_cancel_all(bond);
5235                 destroy_workqueue(bond->wq);
5236         }
5237
5238         bond_destroy_sysfs();
5239
5240         rtnl_lock();
5241         bond_free_all();
5242         rtnl_unlock();
5243 out:
5244         return res;
5245
5246 }
5247
5248 static void __exit bonding_exit(void)
5249 {
5250         unregister_netdevice_notifier(&bond_netdev_notifier);
5251         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5252         bond_unregister_ipv6_notifier();
5253
5254         bond_destroy_sysfs();
5255
5256         rtnl_lock();
5257         bond_free_all();
5258         rtnl_unlock();
5259 }
5260
5261 module_init(bonding_init);
5262 module_exit(bonding_exit);
5263 MODULE_LICENSE("GPL");
5264 MODULE_VERSION(DRV_VERSION);
5265 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5266 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5267 MODULE_SUPPORTED_DEVICE("most ethernet devices");
5268
5269 /*
5270  * Local variables:
5271  *  c-indent-level: 8
5272  *  c-basic-offset: 8
5273  *  tab-width: 8
5274  * End:
5275  */
5276