git.oblomov.eu Git - linux-2.6/blob - drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 //#define BONDING_DEBUG 1
  35
  36 #include <linux/config.h>
  37 #include <linux/kernel.h>
  38 #include <linux/module.h>
  39 #include <linux/sched.h>
  40 #include <linux/types.h>
  41 #include <linux/fcntl.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/ptrace.h>
  44 #include <linux/ioport.h>
  45 #include <linux/in.h>
  46 #include <net/ip.h>
  47 #include <linux/ip.h>
  48 #include <linux/tcp.h>
  49 #include <linux/udp.h>
  50 #include <linux/slab.h>
  51 #include <linux/string.h>
  52 #include <linux/init.h>
  53 #include <linux/timer.h>
  54 #include <linux/socket.h>
  55 #include <linux/ctype.h>
  56 #include <linux/inet.h>
  57 #include <linux/bitops.h>
  58 #include <asm/system.h>
  59 #include <asm/io.h>
  60 #include <asm/dma.h>
  61 #include <asm/uaccess.h>
  62 #include <linux/errno.h>
  63 #include <linux/netdevice.h>
  64 #include <linux/inetdevice.h>
  65 #include <linux/etherdevice.h>
  66 #include <linux/skbuff.h>
  67 #include <net/sock.h>
  68 #include <linux/rtnetlink.h>
  69 #include <linux/proc_fs.h>
  70 #include <linux/seq_file.h>
  71 #include <linux/smp.h>
  72 #include <linux/if_ether.h>
  73 #include <net/arp.h>
  74 #include <linux/mii.h>
  75 #include <linux/ethtool.h>
  76 #include <linux/if_vlan.h>
  77 #include <linux/if_bonding.h>
  78 #include <net/route.h>
  79 #include "bonding.h"
  80 #include "bond_3ad.h"
  81 #include "bond_alb.h"
  82
  83 /*---------------------------- Module parameters ----------------------------*/
  84
  85 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  86 #define BOND_LINK_MON_INTERV    0
  87 #define BOND_LINK_ARP_INTERV    0
  88
  89 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  90 static int miimon       = BOND_LINK_MON_INTERV;
  91 static int updelay      = 0;
  92 static int downdelay    = 0;
  93 static int use_carrier  = 1;
  94 static char *mode       = NULL;
  95 static char *primary    = NULL;
  96 static char *lacp_rate  = NULL;
  97 static char *xmit_hash_policy = NULL;
  98 static int arp_interval = BOND_LINK_ARP_INTERV;
  99 static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
 100 struct bond_params bonding_defaults;
 101
 102 module_param(max_bonds, int, 0);
 103 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 104 module_param(miimon, int, 0);
 105 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 106 module_param(updelay, int, 0);
 107 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 108 module_param(downdelay, int, 0);
 109 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 110                             "in milliseconds");
 111 module_param(use_carrier, int, 0);
 112 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 113                               "0 for off, 1 for on (default)");
 114 module_param(mode, charp, 0);
 115 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 116                        "1 for active-backup, 2 for balance-xor, "
 117                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 118                        "6 for balance-alb");
 119 module_param(primary, charp, 0);
 120 MODULE_PARM_DESC(primary, "Primary network device to use");
 121 module_param(lacp_rate, charp, 0);
 122 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 123                             "(slow/fast)");
 124 module_param(xmit_hash_policy, charp, 0);
 125 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 126                                    ", 1 for layer 3+4");
 127 module_param(arp_interval, int, 0);
 128 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 129 module_param_array(arp_ip_target, charp, NULL, 0);
 130 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 131
 132 /*----------------------------- Global variables ----------------------------*/
 133
 134 static const char *version =
 135         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 136
 137 LIST_HEAD(bond_dev_list);
 138
 139 #ifdef CONFIG_PROC_FS
 140 static struct proc_dir_entry *bond_proc_dir = NULL;
 141 #endif
 142
 143 extern struct rw_semaphore bonding_rwsem;
 144 static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
 145 static int arp_ip_count = 0;
 146 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 147 static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
 148 static int lacp_fast    = 0;
 149
 150
 151 struct bond_parm_tbl bond_lacp_tbl[] = {
 152 {       "slow",         AD_LACP_SLOW},
 153 {       "fast",         AD_LACP_FAST},
 154 {       NULL,           -1},
 155 };
 156
 157 struct bond_parm_tbl bond_mode_tbl[] = {
 158 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 159 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 160 {       "balance-xor",          BOND_MODE_XOR},
 161 {       "broadcast",            BOND_MODE_BROADCAST},
 162 {       "802.3ad",              BOND_MODE_8023AD},
 163 {       "balance-tlb",          BOND_MODE_TLB},
 164 {       "balance-alb",          BOND_MODE_ALB},
 165 {       NULL,                   -1},
 166 };
 167
 168 struct bond_parm_tbl xmit_hashtype_tbl[] = {
 169 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 170 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 171 {       NULL,                   -1},
 172 };
 173
 174 /*-------------------------- Forward declarations ---------------------------*/
 175
 176 static void bond_send_gratuitous_arp(struct bonding *bond);
 177
 178 /*---------------------------- General routines -----------------------------*/
 179
 180 const char *bond_mode_name(int mode)
 181 {
 182         switch (mode) {
 183         case BOND_MODE_ROUNDROBIN :
 184                 return "load balancing (round-robin)";
 185         case BOND_MODE_ACTIVEBACKUP :
 186                 return "fault-tolerance (active-backup)";
 187         case BOND_MODE_XOR :
 188                 return "load balancing (xor)";
 189         case BOND_MODE_BROADCAST :
 190                 return "fault-tolerance (broadcast)";
 191         case BOND_MODE_8023AD:
 192                 return "IEEE 802.3ad Dynamic link aggregation";
 193         case BOND_MODE_TLB:
 194                 return "transmit load balancing";
 195         case BOND_MODE_ALB:
 196                 return "adaptive load balancing";
 197         default:
 198                 return "unknown";
 199         }
 200 }
 201
 202 /*---------------------------------- VLAN -----------------------------------*/
 203
 204 /**
 205  * bond_add_vlan - add a new vlan id on bond
 206  * @bond: bond that got the notification
 207  * @vlan_id: the vlan id to add
 208  *
 209  * Returns -ENOMEM if allocation failed.
 210  */
 211 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 212 {
 213         struct vlan_entry *vlan;
 214
 215         dprintk("bond: %s, vlan id %d\n",
 216                 (bond ? bond->dev->name: "None"), vlan_id);
 217
 218         vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 219         if (!vlan) {
 220                 return -ENOMEM;
 221         }
 222
 223         INIT_LIST_HEAD(&vlan->vlan_list);
 224         vlan->vlan_id = vlan_id;
 225         vlan->vlan_ip = 0;
 226
 227         write_lock_bh(&bond->lock);
 228
 229         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 230
 231         write_unlock_bh(&bond->lock);
 232
 233         dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 234
 235         return 0;
 236 }
 237
 238 /**
 239  * bond_del_vlan - delete a vlan id from bond
 240  * @bond: bond that got the notification
 241  * @vlan_id: the vlan id to delete
 242  *
 243  * returns -ENODEV if @vlan_id was not found in @bond.
 244  */
 245 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 246 {
 247         struct vlan_entry *vlan, *next;
 248         int res = -ENODEV;
 249
 250         dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 251
 252         write_lock_bh(&bond->lock);
 253
 254         list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
 255                 if (vlan->vlan_id == vlan_id) {
 256                         list_del(&vlan->vlan_list);
 257
 258                         if ((bond->params.mode == BOND_MODE_TLB) ||
 259                             (bond->params.mode == BOND_MODE_ALB)) {
 260                                 bond_alb_clear_vlan(bond, vlan_id);
 261                         }
 262
 263                         dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
 264                                 bond->dev->name);
 265
 266                         kfree(vlan);
 267
 268                         if (list_empty(&bond->vlan_list) &&
 269                             (bond->slave_cnt == 0)) {
 270                                 /* Last VLAN removed and no slaves, so
 271                                  * restore block on adding VLANs. This will
 272                                  * be removed once new slaves that are not
 273                                  * VLAN challenged will be added.
 274                                  */
 275                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 276                         }
 277
 278                         res = 0;
 279                         goto out;
 280                 }
 281         }
 282
 283         dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
 284                 bond->dev->name);
 285
 286 out:
 287         write_unlock_bh(&bond->lock);
 288         return res;
 289 }
 290
 291 /**
 292  * bond_has_challenged_slaves
 293  * @bond: the bond we're working on
 294  *
 295  * Searches the slave list. Returns 1 if a vlan challenged slave
 296  * was found, 0 otherwise.
 297  *
 298  * Assumes bond->lock is held.
 299  */
 300 static int bond_has_challenged_slaves(struct bonding *bond)
 301 {
 302         struct slave *slave;
 303         int i;
 304
 305         bond_for_each_slave(bond, slave, i) {
 306                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 307                         dprintk("found VLAN challenged slave - %s\n",
 308                                 slave->dev->name);
 309                         return 1;
 310                 }
 311         }
 312
 313         dprintk("no VLAN challenged slaves found\n");
 314         return 0;
 315 }
 316
 317 /**
 318  * bond_next_vlan - safely skip to the next item in the vlans list.
 319  * @bond: the bond we're working on
 320  * @curr: item we're advancing from
 321  *
 322  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 323  * or @curr->next otherwise (even if it is @curr itself again).
 324  *
 325  * Caller must hold bond->lock
 326  */
 327 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 328 {
 329         struct vlan_entry *next, *last;
 330
 331         if (list_empty(&bond->vlan_list)) {
 332                 return NULL;
 333         }
 334
 335         if (!curr) {
 336                 next = list_entry(bond->vlan_list.next,
 337                                   struct vlan_entry, vlan_list);
 338         } else {
 339                 last = list_entry(bond->vlan_list.prev,
 340                                   struct vlan_entry, vlan_list);
 341                 if (last == curr) {
 342                         next = list_entry(bond->vlan_list.next,
 343                                           struct vlan_entry, vlan_list);
 344                 } else {
 345                         next = list_entry(curr->vlan_list.next,
 346                                           struct vlan_entry, vlan_list);
 347                 }
 348         }
 349
 350         return next;
 351 }
 352
 353 /**
 354  * bond_dev_queue_xmit - Prepare skb for xmit.
 355  *
 356  * @bond: bond device that got this skb for tx.
 357  * @skb: hw accel VLAN tagged skb to transmit
 358  * @slave_dev: slave that is supposed to xmit this skbuff
 359  *
 360  * When the bond gets an skb to transmit that is
 361  * already hardware accelerated VLAN tagged, and it
 362  * needs to relay this skb to a slave that is not
 363  * hw accel capable, the skb needs to be "unaccelerated",
 364  * i.e. strip the hwaccel tag and re-insert it as part
 365  * of the payload.
 366  */
 367 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
 368 {
 369         unsigned short vlan_id;
 370
 371         if (!list_empty(&bond->vlan_list) &&
 372             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 373             vlan_get_tag(skb, &vlan_id) == 0) {
 374                 skb->dev = slave_dev;
 375                 skb = vlan_put_tag(skb, vlan_id);
 376                 if (!skb) {
 377                         /* vlan_put_tag() frees the skb in case of error,
 378                          * so return success here so the calling functions
 379                          * won't attempt to free is again.
 380                          */
 381                         return 0;
 382                 }
 383         } else {
 384                 skb->dev = slave_dev;
 385         }
 386
 387         skb->priority = 1;
 388         dev_queue_xmit(skb);
 389
 390         return 0;
 391 }
 392
 393 /*
 394  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 395  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 396  * lock because:
 397  * a. This operation is performed in IOCTL context,
 398  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 399  * c. Holding a lock with BH disabled while directly calling a base driver
 400  *    entry point is generally a BAD idea.
 401  *
 402  * The design of synchronization/protection for this operation in the 8021q
 403  * module is good for one or more VLAN devices over a single physical device
 404  * and cannot be extended for a teaming solution like bonding, so there is a
 405  * potential race condition here where a net device from the vlan group might
 406  * be referenced (either by a base driver or the 8021q code) while it is being
 407  * removed from the system. However, it turns out we're not making matters
 408  * worse, and if it works for regular VLAN usage it will work here too.
 409 */
 410
 411 /**
 412  * bond_vlan_rx_register - Propagates registration to slaves
 413  * @bond_dev: bonding net device that got called
 414  * @grp: vlan group being registered
 415  */
 416 static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
 417 {
 418         struct bonding *bond = bond_dev->priv;
 419         struct slave *slave;
 420         int i;
 421
 422         bond->vlgrp = grp;
 423
 424         bond_for_each_slave(bond, slave, i) {
 425                 struct net_device *slave_dev = slave->dev;
 426
 427                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 428                     slave_dev->vlan_rx_register) {
 429                         slave_dev->vlan_rx_register(slave_dev, grp);
 430                 }
 431         }
 432 }
 433
 434 /**
 435  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 436  * @bond_dev: bonding net device that got called
 437  * @vid: vlan id being added
 438  */
 439 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 440 {
 441         struct bonding *bond = bond_dev->priv;
 442         struct slave *slave;
 443         int i, res;
 444
 445         bond_for_each_slave(bond, slave, i) {
 446                 struct net_device *slave_dev = slave->dev;
 447
 448                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 449                     slave_dev->vlan_rx_add_vid) {
 450                         slave_dev->vlan_rx_add_vid(slave_dev, vid);
 451                 }
 452         }
 453
 454         res = bond_add_vlan(bond, vid);
 455         if (res) {
 456                 printk(KERN_ERR DRV_NAME
 457                        ": %s: Error: Failed to add vlan id %d\n",
 458                        bond_dev->name, vid);
 459         }
 460 }
 461
 462 /**
 463  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 464  * @bond_dev: bonding net device that got called
 465  * @vid: vlan id being removed
 466  */
 467 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 468 {
 469         struct bonding *bond = bond_dev->priv;
 470         struct slave *slave;
 471         struct net_device *vlan_dev;
 472         int i, res;
 473
 474         bond_for_each_slave(bond, slave, i) {
 475                 struct net_device *slave_dev = slave->dev;
 476
 477                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 478                     slave_dev->vlan_rx_kill_vid) {
 479                         /* Save and then restore vlan_dev in the grp array,
 480                          * since the slave's driver might clear it.
 481                          */
 482                         vlan_dev = bond->vlgrp->vlan_devices[vid];
 483                         slave_dev->vlan_rx_kill_vid(slave_dev, vid);
 484                         bond->vlgrp->vlan_devices[vid] = vlan_dev;
 485                 }
 486         }
 487
 488         res = bond_del_vlan(bond, vid);
 489         if (res) {
 490                 printk(KERN_ERR DRV_NAME
 491                        ": %s: Error: Failed to remove vlan id %d\n",
 492                        bond_dev->name, vid);
 493         }
 494 }
 495
 496 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 497 {
 498         struct vlan_entry *vlan;
 499
 500         write_lock_bh(&bond->lock);
 501
 502         if (list_empty(&bond->vlan_list)) {
 503                 goto out;
 504         }
 505
 506         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 507             slave_dev->vlan_rx_register) {
 508                 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
 509         }
 510
 511         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 512             !(slave_dev->vlan_rx_add_vid)) {
 513                 goto out;
 514         }
 515
 516         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 517                 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 518         }
 519
 520 out:
 521         write_unlock_bh(&bond->lock);
 522 }
 523
 524 static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
 525 {
 526         struct vlan_entry *vlan;
 527         struct net_device *vlan_dev;
 528
 529         write_lock_bh(&bond->lock);
 530
 531         if (list_empty(&bond->vlan_list)) {
 532                 goto out;
 533         }
 534
 535         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 536             !(slave_dev->vlan_rx_kill_vid)) {
 537                 goto unreg;
 538         }
 539
 540         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 541                 /* Save and then restore vlan_dev in the grp array,
 542                  * since the slave's driver might clear it.
 543                  */
 544                 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
 545                 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 546                 bond->vlgrp->vlan_devices[vlan->vlan_id] = vlan_dev;
 547         }
 548
 549 unreg:
 550         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 551             slave_dev->vlan_rx_register) {
 552                 slave_dev->vlan_rx_register(slave_dev, NULL);
 553         }
 554
 555 out:
 556         write_unlock_bh(&bond->lock);
 557 }
 558
 559 /*------------------------------- Link status -------------------------------*/
 560
 561 /*
 562  * Get link speed and duplex from the slave's base driver
 563  * using ethtool. If for some reason the call fails or the
 564  * values are invalid, fake speed and duplex to 100/Full
 565  * and return error.
 566  */
 567 static int bond_update_speed_duplex(struct slave *slave)
 568 {
 569         struct net_device *slave_dev = slave->dev;
 570         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 571         struct ifreq ifr;
 572         struct ethtool_cmd etool;
 573
 574         /* Fake speed and duplex */
 575         slave->speed = SPEED_100;
 576         slave->duplex = DUPLEX_FULL;
 577
 578         if (slave_dev->ethtool_ops) {
 579                 int res;
 580
 581                 if (!slave_dev->ethtool_ops->get_settings) {
 582                         return -1;
 583                 }
 584
 585                 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 586                 if (res < 0) {
 587                         return -1;
 588                 }
 589
 590                 goto verify;
 591         }
 592
 593         ioctl = slave_dev->do_ioctl;
 594         strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 595         etool.cmd = ETHTOOL_GSET;
 596         ifr.ifr_data = (char*)&etool;
 597         if (!ioctl || (IOCTL(slave_dev, &ifr, SIOCETHTOOL) < 0)) {
 598                 return -1;
 599         }
 600
 601 verify:
 602         switch (etool.speed) {
 603         case SPEED_10:
 604         case SPEED_100:
 605         case SPEED_1000:
 606                 break;
 607         default:
 608                 return -1;
 609         }
 610
 611         switch (etool.duplex) {
 612         case DUPLEX_FULL:
 613         case DUPLEX_HALF:
 614                 break;
 615         default:
 616                 return -1;
 617         }
 618
 619         slave->speed = etool.speed;
 620         slave->duplex = etool.duplex;
 621
 622         return 0;
 623 }
 624
 625 /*
 626  * if <dev> supports MII link status reporting, check its link status.
 627  *
 628  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 629  * depening upon the setting of the use_carrier parameter.
 630  *
 631  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 632  * can't tell and just pretend it is), or 0, meaning that the link is
 633  * down.
 634  *
 635  * If reporting is non-zero, instead of faking link up, return -1 if
 636  * both ETHTOOL and MII ioctls fail (meaning the device does not
 637  * support them).  If use_carrier is set, return whatever it says.
 638  * It'd be nice if there was a good way to tell if a driver supports
 639  * netif_carrier, but there really isn't.
 640  */
 641 static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
 642 {
 643         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 644         struct ifreq ifr;
 645         struct mii_ioctl_data *mii;
 646         struct ethtool_value etool;
 647
 648         if (bond->params.use_carrier) {
 649                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 650         }
 651
 652         ioctl = slave_dev->do_ioctl;
 653         if (ioctl) {
 654                 /* TODO: set pointer to correct ioctl on a per team member */
 655                 /*       bases to make this more efficient. that is, once  */
 656                 /*       we determine the correct ioctl, we will always    */
 657                 /*       call it and not the others for that team          */
 658                 /*       member.                                           */
 659
 660                 /*
 661                  * We cannot assume that SIOCGMIIPHY will also read a
 662                  * register; not all network drivers (e.g., e100)
 663                  * support that.
 664                  */
 665
 666                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 667                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 668                 mii = if_mii(&ifr);
 669                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 670                         mii->reg_num = MII_BMSR;
 671                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
 672                                 return (mii->val_out & BMSR_LSTATUS);
 673                         }
 674                 }
 675         }
 676
 677         /* try SIOCETHTOOL ioctl, some drivers cache ETHTOOL_GLINK */
 678         /* for a period of time so we attempt to get link status   */
 679         /* from it last if the above MII ioctls fail...            */
 680         if (slave_dev->ethtool_ops) {
 681                 if (slave_dev->ethtool_ops->get_link) {
 682                         u32 link;
 683
 684                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 685
 686                         return link ? BMSR_LSTATUS : 0;
 687                 }
 688         }
 689
 690         if (ioctl) {
 691                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 692                 etool.cmd = ETHTOOL_GLINK;
 693                 ifr.ifr_data = (char*)&etool;
 694                 if (IOCTL(slave_dev, &ifr, SIOCETHTOOL) == 0) {
 695                         if (etool.data == 1) {
 696                                 return BMSR_LSTATUS;
 697                         } else {
 698                                 dprintk("SIOCETHTOOL shows link down\n");
 699                                 return 0;
 700                         }
 701                 }
 702         }
 703
 704         /*
 705          * If reporting, report that either there's no dev->do_ioctl,
 706          * or both SIOCGMIIREG and SIOCETHTOOL failed (meaning that we
 707          * cannot report link status).  If not reporting, pretend
 708          * we're ok.
 709          */
 710         return (reporting ? -1 : BMSR_LSTATUS);
 711 }
 712
 713 /*----------------------------- Multicast list ------------------------------*/
 714
 715 /*
 716  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
 717  */
 718 static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
 719 {
 720         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
 721                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
 722 }
 723
 724 /*
 725  * returns dmi entry if found, NULL otherwise
 726  */
 727 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
 728 {
 729         struct dev_mc_list *idmi;
 730
 731         for (idmi = mc_list; idmi; idmi = idmi->next) {
 732                 if (bond_is_dmi_same(dmi, idmi)) {
 733                         return idmi;
 734                 }
 735         }
 736
 737         return NULL;
 738 }
 739
 740 /*
 741  * Push the promiscuity flag down to appropriate slaves
 742  */
 743 static void bond_set_promiscuity(struct bonding *bond, int inc)
 744 {
 745         if (USES_PRIMARY(bond->params.mode)) {
 746                 /* write lock already acquired */
 747                 if (bond->curr_active_slave) {
 748                         dev_set_promiscuity(bond->curr_active_slave->dev, inc);
 749                 }
 750         } else {
 751                 struct slave *slave;
 752                 int i;
 753                 bond_for_each_slave(bond, slave, i) {
 754                         dev_set_promiscuity(slave->dev, inc);
 755                 }
 756         }
 757 }
 758
 759 /*
 760  * Push the allmulti flag down to all slaves
 761  */
 762 static void bond_set_allmulti(struct bonding *bond, int inc)
 763 {
 764         if (USES_PRIMARY(bond->params.mode)) {
 765                 /* write lock already acquired */
 766                 if (bond->curr_active_slave) {
 767                         dev_set_allmulti(bond->curr_active_slave->dev, inc);
 768                 }
 769         } else {
 770                 struct slave *slave;
 771                 int i;
 772                 bond_for_each_slave(bond, slave, i) {
 773                         dev_set_allmulti(slave->dev, inc);
 774                 }
 775         }
 776 }
 777
 778 /*
 779  * Add a Multicast address to slaves
 780  * according to mode
 781  */
 782 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
 783 {
 784         if (USES_PRIMARY(bond->params.mode)) {
 785                 /* write lock already acquired */
 786                 if (bond->curr_active_slave) {
 787                         dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
 788                 }
 789         } else {
 790                 struct slave *slave;
 791                 int i;
 792                 bond_for_each_slave(bond, slave, i) {
 793                         dev_mc_add(slave->dev, addr, alen, 0);
 794                 }
 795         }
 796 }
 797
 798 /*
 799  * Remove a multicast address from slave
 800  * according to mode
 801  */
 802 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
 803 {
 804         if (USES_PRIMARY(bond->params.mode)) {
 805                 /* write lock already acquired */
 806                 if (bond->curr_active_slave) {
 807                         dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
 808                 }
 809         } else {
 810                 struct slave *slave;
 811                 int i;
 812                 bond_for_each_slave(bond, slave, i) {
 813                         dev_mc_delete(slave->dev, addr, alen, 0);
 814                 }
 815         }
 816 }
 817
 818 /*
 819  * Totally destroys the mc_list in bond
 820  */
 821 static void bond_mc_list_destroy(struct bonding *bond)
 822 {
 823         struct dev_mc_list *dmi;
 824
 825         dmi = bond->mc_list;
 826         while (dmi) {
 827                 bond->mc_list = dmi->next;
 828                 kfree(dmi);
 829                 dmi = bond->mc_list;
 830         }
 831 }
 832
 833 /*
 834  * Copy all the Multicast addresses from src to the bonding device dst
 835  */
 836 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
 837                              gfp_t gfp_flag)
 838 {
 839         struct dev_mc_list *dmi, *new_dmi;
 840
 841         for (dmi = mc_list; dmi; dmi = dmi->next) {
 842                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
 843
 844                 if (!new_dmi) {
 845                         /* FIXME: Potential memory leak !!! */
 846                         return -ENOMEM;
 847                 }
 848
 849                 new_dmi->next = bond->mc_list;
 850                 bond->mc_list = new_dmi;
 851                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
 852                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
 853                 new_dmi->dmi_users = dmi->dmi_users;
 854                 new_dmi->dmi_gusers = dmi->dmi_gusers;
 855         }
 856
 857         return 0;
 858 }
 859
 860 /*
 861  * flush all members of flush->mc_list from device dev->mc_list
 862  */
 863 static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
 864 {
 865         struct bonding *bond = bond_dev->priv;
 866         struct dev_mc_list *dmi;
 867
 868         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
 869                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 870         }
 871
 872         if (bond->params.mode == BOND_MODE_8023AD) {
 873                 /* del lacpdu mc addr from mc list */
 874                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 875
 876                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
 877         }
 878 }
 879
 880 /*--------------------------- Active slave change ---------------------------*/
 881
 882 /*
 883  * Update the mc list and multicast-related flags for the new and
 884  * old active slaves (if any) according to the multicast mode, and
 885  * promiscuous flags unconditionally.
 886  */
 887 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
 888 {
 889         struct dev_mc_list *dmi;
 890
 891         if (!USES_PRIMARY(bond->params.mode)) {
 892                 /* nothing to do -  mc list is already up-to-date on
 893                  * all slaves
 894                  */
 895                 return;
 896         }
 897
 898         if (old_active) {
 899                 if (bond->dev->flags & IFF_PROMISC) {
 900                         dev_set_promiscuity(old_active->dev, -1);
 901                 }
 902
 903                 if (bond->dev->flags & IFF_ALLMULTI) {
 904                         dev_set_allmulti(old_active->dev, -1);
 905                 }
 906
 907                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 908                         dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 909                 }
 910         }
 911
 912         if (new_active) {
 913                 if (bond->dev->flags & IFF_PROMISC) {
 914                         dev_set_promiscuity(new_active->dev, 1);
 915                 }
 916
 917                 if (bond->dev->flags & IFF_ALLMULTI) {
 918                         dev_set_allmulti(new_active->dev, 1);
 919                 }
 920
 921                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 922                         dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 923                 }
 924         }
 925 }
 926
 927 /**
 928  * find_best_interface - select the best available slave to be the active one
 929  * @bond: our bonding struct
 930  *
 931  * Warning: Caller must hold curr_slave_lock for writing.
 932  */
 933 static struct slave *bond_find_best_slave(struct bonding *bond)
 934 {
 935         struct slave *new_active, *old_active;
 936         struct slave *bestslave = NULL;
 937         int mintime = bond->params.updelay;
 938         int i;
 939
 940         new_active = old_active = bond->curr_active_slave;
 941
 942         if (!new_active) { /* there were no active slaves left */
 943                 if (bond->slave_cnt > 0) {  /* found one slave */
 944                         new_active = bond->first_slave;
 945                 } else {
 946                         return NULL; /* still no slave, return NULL */
 947                 }
 948         }
 949
 950         /* first try the primary link; if arping, a link must tx/rx traffic
 951          * before it can be considered the curr_active_slave - also, we would skip
 952          * slaves between the curr_active_slave and primary_slave that may be up
 953          * and able to arp
 954          */
 955         if ((bond->primary_slave) &&
 956             (!bond->params.arp_interval) &&
 957             (IS_UP(bond->primary_slave->dev))) {
 958                 new_active = bond->primary_slave;
 959         }
 960
 961         /* remember where to stop iterating over the slaves */
 962         old_active = new_active;
 963
 964         bond_for_each_slave_from(bond, new_active, i, old_active) {
 965                 if (IS_UP(new_active->dev)) {
 966                         if (new_active->link == BOND_LINK_UP) {
 967                                 return new_active;
 968                         } else if (new_active->link == BOND_LINK_BACK) {
 969                                 /* link up, but waiting for stabilization */
 970                                 if (new_active->delay < mintime) {
 971                                         mintime = new_active->delay;
 972                                         bestslave = new_active;
 973                                 }
 974                         }
 975                 }
 976         }
 977
 978         return bestslave;
 979 }
 980
 981 /**
 982  * change_active_interface - change the active slave into the specified one
 983  * @bond: our bonding struct
 984  * @new: the new slave to make the active one
 985  *
 986  * Set the new slave to the bond's settings and unset them on the old
 987  * curr_active_slave.
 988  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 989  *
 990  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 991  * because it is apparently the best available slave we have, even though its
 992  * updelay hasn't timed out yet.
 993  *
 994  * Warning: Caller must hold curr_slave_lock for writing.
 995  */
 996 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 997 {
 998         struct slave *old_active = bond->curr_active_slave;
 999
1000         if (old_active == new_active) {
1001                 return;
1002         }
1003
1004         if (new_active) {
1005                 if (new_active->link == BOND_LINK_BACK) {
1006                         if (USES_PRIMARY(bond->params.mode)) {
1007                                 printk(KERN_INFO DRV_NAME
1008                                        ": %s: making interface %s the new "
1009                                        "active one %d ms earlier.\n",
1010                                        bond->dev->name, new_active->dev->name,
1011                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1012                         }
1013
1014                         new_active->delay = 0;
1015                         new_active->link = BOND_LINK_UP;
1016                         new_active->jiffies = jiffies;
1017
1018                         if (bond->params.mode == BOND_MODE_8023AD) {
1019                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1020                         }
1021
1022                         if ((bond->params.mode == BOND_MODE_TLB) ||
1023                             (bond->params.mode == BOND_MODE_ALB)) {
1024                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1025                         }
1026                 } else {
1027                         if (USES_PRIMARY(bond->params.mode)) {
1028                                 printk(KERN_INFO DRV_NAME
1029                                        ": %s: making interface %s the new "
1030                                        "active one.\n",
1031                                        bond->dev->name, new_active->dev->name);
1032                         }
1033                 }
1034         }
1035
1036         if (USES_PRIMARY(bond->params.mode)) {
1037                 bond_mc_swap(bond, new_active, old_active);
1038         }
1039
1040         if ((bond->params.mode == BOND_MODE_TLB) ||
1041             (bond->params.mode == BOND_MODE_ALB)) {
1042                 bond_alb_handle_active_change(bond, new_active);
1043         } else {
1044                 bond->curr_active_slave = new_active;
1045         }
1046
1047         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1048                 if (old_active) {
1049                         bond_set_slave_inactive_flags(old_active);
1050                 }
1051
1052                 if (new_active) {
1053                         bond_set_slave_active_flags(new_active);
1054                 }
1055                 bond_send_gratuitous_arp(bond);
1056         }
1057 }
1058
1059 /**
1060  * bond_select_active_slave - select a new active slave, if needed
1061  * @bond: our bonding struct
1062  *
1063  * This functions shoud be called when one of the following occurs:
1064  * - The old curr_active_slave has been released or lost its link.
1065  * - The primary_slave has got its link back.
1066  * - A slave has got its link back and there's no old curr_active_slave.
1067  *
1068  * Warning: Caller must hold curr_slave_lock for writing.
1069  */
1070 void bond_select_active_slave(struct bonding *bond)
1071 {
1072         struct slave *best_slave;
1073
1074         best_slave = bond_find_best_slave(bond);
1075         if (best_slave != bond->curr_active_slave) {
1076                 bond_change_active_slave(bond, best_slave);
1077         }
1078 }
1079
1080 /*--------------------------- slave list handling ---------------------------*/
1081
1082 /*
1083  * This function attaches the slave to the end of list.
1084  *
1085  * bond->lock held for writing by caller.
1086  */
1087 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1088 {
1089         if (bond->first_slave == NULL) { /* attaching the first slave */
1090                 new_slave->next = new_slave;
1091                 new_slave->prev = new_slave;
1092                 bond->first_slave = new_slave;
1093         } else {
1094                 new_slave->next = bond->first_slave;
1095                 new_slave->prev = bond->first_slave->prev;
1096                 new_slave->next->prev = new_slave;
1097                 new_slave->prev->next = new_slave;
1098         }
1099
1100         bond->slave_cnt++;
1101 }
1102
1103 /*
1104  * This function detaches the slave from the list.
1105  * WARNING: no check is made to verify if the slave effectively
1106  * belongs to <bond>.
1107  * Nothing is freed on return, structures are just unchained.
1108  * If any slave pointer in bond was pointing to <slave>,
1109  * it should be changed by the calling function.
1110  *
1111  * bond->lock held for writing by caller.
1112  */
1113 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1114 {
1115         if (slave->next) {
1116                 slave->next->prev = slave->prev;
1117         }
1118
1119         if (slave->prev) {
1120                 slave->prev->next = slave->next;
1121         }
1122
1123         if (bond->first_slave == slave) { /* slave is the first slave */
1124                 if (bond->slave_cnt > 1) { /* there are more slave */
1125                         bond->first_slave = slave->next;
1126                 } else {
1127                         bond->first_slave = NULL; /* slave was the last one */
1128                 }
1129         }
1130
1131         slave->next = NULL;
1132         slave->prev = NULL;
1133         bond->slave_cnt--;
1134 }
1135
1136 /*---------------------------------- IOCTL ----------------------------------*/
1137
1138 int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev)
1139 {
1140         dprintk("bond_dev=%p\n", bond_dev);
1141         dprintk("slave_dev=%p\n", slave_dev);
1142         dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1143         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1144         return 0;
1145 }
1146
1147 #define BOND_INTERSECT_FEATURES \
1148         (NETIF_F_SG|NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM|\
1149         NETIF_F_TSO|NETIF_F_UFO)
1150
1151 /*
1152  * Compute the common dev->feature set available to all slaves.  Some
1153  * feature bits are managed elsewhere, so preserve feature bits set on
1154  * master device that are not part of the examined set.
1155  */
1156 static int bond_compute_features(struct bonding *bond)
1157 {
1158         unsigned long features = BOND_INTERSECT_FEATURES;
1159         struct slave *slave;
1160         struct net_device *bond_dev = bond->dev;
1161         int i;
1162
1163         bond_for_each_slave(bond, slave, i)
1164                 features &= (slave->dev->features & BOND_INTERSECT_FEATURES);
1165
1166         if ((features & NETIF_F_SG) &&
1167             !(features & (NETIF_F_IP_CSUM |
1168                           NETIF_F_NO_CSUM |
1169                           NETIF_F_HW_CSUM)))
1170                 features &= ~NETIF_F_SG;
1171
1172         /*
1173          * features will include NETIF_F_TSO (NETIF_F_UFO) iff all
1174          * slave devices support NETIF_F_TSO (NETIF_F_UFO), which
1175          * implies that all slaves also support scatter-gather
1176          * (NETIF_F_SG), which implies that features also includes
1177          * NETIF_F_SG. So no need to check whether we have an
1178          * illegal combination of NETIF_F_{TSO,UFO} and
1179          * !NETIF_F_SG
1180          */
1181
1182         features |= (bond_dev->features & ~BOND_INTERSECT_FEATURES);
1183         bond_dev->features = features;
1184
1185         return 0;
1186 }
1187
1188 /* enslave device <slave> to bond device <master> */
1189 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1190 {
1191         struct bonding *bond = bond_dev->priv;
1192         struct slave *new_slave = NULL;
1193         struct dev_mc_list *dmi;
1194         struct sockaddr addr;
1195         int link_reporting;
1196         int old_features = bond_dev->features;
1197         int res = 0;
1198
1199         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1200                 slave_dev->do_ioctl == NULL) {
1201                 printk(KERN_WARNING DRV_NAME
1202                        ": %s: Warning: no link monitoring support for %s\n",
1203                        bond_dev->name, slave_dev->name);
1204         }
1205
1206         /* bond must be initialized by bond_open() before enslaving */
1207         if (!(bond_dev->flags & IFF_UP)) {
1208                 dprintk("Error, master_dev is not up\n");
1209                 return -EPERM;
1210         }
1211
1212         /* already enslaved */
1213         if (slave_dev->flags & IFF_SLAVE) {
1214                 dprintk("Error, Device was already enslaved\n");
1215                 return -EBUSY;
1216         }
1217
1218         /* vlan challenged mutual exclusion */
1219         /* no need to lock since we're protected by rtnl_lock */
1220         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1221                 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1222                 if (!list_empty(&bond->vlan_list)) {
1223                         printk(KERN_ERR DRV_NAME
1224                                ": %s: Error: cannot enslave VLAN "
1225                                "challenged slave %s on VLAN enabled "
1226                                "bond %s\n", bond_dev->name, slave_dev->name,
1227                                bond_dev->name);
1228                         return -EPERM;
1229                 } else {
1230                         printk(KERN_WARNING DRV_NAME
1231                                ": %s: Warning: enslaved VLAN challenged "
1232                                "slave %s. Adding VLANs will be blocked as "
1233                                "long as %s is part of bond %s\n",
1234                                bond_dev->name, slave_dev->name, slave_dev->name,
1235                                bond_dev->name);
1236                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1237                 }
1238         } else {
1239                 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1240                 if (bond->slave_cnt == 0) {
1241                         /* First slave, and it is not VLAN challenged,
1242                          * so remove the block of adding VLANs over the bond.
1243                          */
1244                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1245                 }
1246         }
1247
1248         /*
1249          * Old ifenslave binaries are no longer supported.  These can
1250          * be identified with moderate accurary by the state of the slave:
1251          * the current ifenslave will set the interface down prior to
1252          * enslaving it; the old ifenslave will not.
1253          */
1254         if ((slave_dev->flags & IFF_UP)) {
1255                 printk(KERN_ERR DRV_NAME ": %s is up. "
1256                        "This may be due to an out of date ifenslave.\n",
1257                        slave_dev->name);
1258                 res = -EPERM;
1259                 goto err_undo_flags;
1260         }
1261
1262         if (slave_dev->set_mac_address == NULL) {
1263                 printk(KERN_ERR DRV_NAME
1264                         ": %s: Error: The slave device you specified does "
1265                         "not support setting the MAC address. "
1266                         "Your kernel likely does not support slave "
1267                         "devices.\n", bond_dev->name);
1268                 res = -EOPNOTSUPP;
1269                 goto err_undo_flags;
1270         }
1271
1272         new_slave = kmalloc(sizeof(struct slave), GFP_KERNEL);
1273         if (!new_slave) {
1274                 res = -ENOMEM;
1275                 goto err_undo_flags;
1276         }
1277
1278         memset(new_slave, 0, sizeof(struct slave));
1279
1280         /* save slave's original flags before calling
1281          * netdev_set_master and dev_open
1282          */
1283         new_slave->original_flags = slave_dev->flags;
1284
1285         /*
1286          * Save slave's original ("permanent") mac address for modes
1287          * that need it, and for restoring it upon release, and then
1288          * set it to the master's address
1289          */
1290         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1291
1292         /*
1293          * Set slave to master's mac address.  The application already
1294          * set the master's mac address to that of the first slave
1295          */
1296         memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1297         addr.sa_family = slave_dev->type;
1298         res = dev_set_mac_address(slave_dev, &addr);
1299         if (res) {
1300                 dprintk("Error %d calling set_mac_address\n", res);
1301                 goto err_free;
1302         }
1303
1304         /* open the slave since the application closed it */
1305         res = dev_open(slave_dev);
1306         if (res) {
1307                 dprintk("Openning slave %s failed\n", slave_dev->name);
1308                 goto err_restore_mac;
1309         }
1310
1311         res = netdev_set_master(slave_dev, bond_dev);
1312         if (res) {
1313                 dprintk("Error %d calling netdev_set_master\n", res);
1314                 goto err_close;
1315         }
1316
1317         new_slave->dev = slave_dev;
1318
1319         if ((bond->params.mode == BOND_MODE_TLB) ||
1320             (bond->params.mode == BOND_MODE_ALB)) {
1321                 /* bond_alb_init_slave() must be called before all other stages since
1322                  * it might fail and we do not want to have to undo everything
1323                  */
1324                 res = bond_alb_init_slave(bond, new_slave);
1325                 if (res) {
1326                         goto err_unset_master;
1327                 }
1328         }
1329
1330         /* If the mode USES_PRIMARY, then the new slave gets the
1331          * master's promisc (and mc) settings only if it becomes the
1332          * curr_active_slave, and that is taken care of later when calling
1333          * bond_change_active()
1334          */
1335         if (!USES_PRIMARY(bond->params.mode)) {
1336                 /* set promiscuity level to new slave */
1337                 if (bond_dev->flags & IFF_PROMISC) {
1338                         dev_set_promiscuity(slave_dev, 1);
1339                 }
1340
1341                 /* set allmulti level to new slave */
1342                 if (bond_dev->flags & IFF_ALLMULTI) {
1343                         dev_set_allmulti(slave_dev, 1);
1344                 }
1345
1346                 /* upload master's mc_list to new slave */
1347                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1348                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1349                 }
1350         }
1351
1352         if (bond->params.mode == BOND_MODE_8023AD) {
1353                 /* add lacpdu mc addr to mc list */
1354                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1355
1356                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1357         }
1358
1359         bond_add_vlans_on_slave(bond, slave_dev);
1360
1361         write_lock_bh(&bond->lock);
1362
1363         bond_attach_slave(bond, new_slave);
1364
1365         new_slave->delay = 0;
1366         new_slave->link_failure_count = 0;
1367
1368         bond_compute_features(bond);
1369
1370         if (bond->params.miimon && !bond->params.use_carrier) {
1371                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1372
1373                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1374                         /*
1375                          * miimon is set but a bonded network driver
1376                          * does not support ETHTOOL/MII and
1377                          * arp_interval is not set.  Note: if
1378                          * use_carrier is enabled, we will never go
1379                          * here (because netif_carrier is always
1380                          * supported); thus, we don't need to change
1381                          * the messages for netif_carrier.
1382                          */
1383                         printk(KERN_WARNING DRV_NAME
1384                                ": %s: Warning: MII and ETHTOOL support not "
1385                                "available for interface %s, and "
1386                                "arp_interval/arp_ip_target module parameters "
1387                                "not specified, thus bonding will not detect "
1388                                "link failures! see bonding.txt for details.\n",
1389                                bond_dev->name, slave_dev->name);
1390                 } else if (link_reporting == -1) {
1391                         /* unable get link status using mii/ethtool */
1392                         printk(KERN_WARNING DRV_NAME
1393                                ": %s: Warning: can't get link status from "
1394                                "interface %s; the network driver associated "
1395                                "with this interface does not support MII or "
1396                                "ETHTOOL link status reporting, thus miimon "
1397                                "has no effect on this interface.\n",
1398                                bond_dev->name, slave_dev->name);
1399                 }
1400         }
1401
1402         /* check for initial state */
1403         if (!bond->params.miimon ||
1404             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1405                 if (bond->params.updelay) {
1406                         dprintk("Initial state of slave_dev is "
1407                                 "BOND_LINK_BACK\n");
1408                         new_slave->link  = BOND_LINK_BACK;
1409                         new_slave->delay = bond->params.updelay;
1410                 } else {
1411                         dprintk("Initial state of slave_dev is "
1412                                 "BOND_LINK_UP\n");
1413                         new_slave->link  = BOND_LINK_UP;
1414                 }
1415                 new_slave->jiffies = jiffies;
1416         } else {
1417                 dprintk("Initial state of slave_dev is "
1418                         "BOND_LINK_DOWN\n");
1419                 new_slave->link  = BOND_LINK_DOWN;
1420         }
1421
1422         if (bond_update_speed_duplex(new_slave) &&
1423             (new_slave->link != BOND_LINK_DOWN)) {
1424                 printk(KERN_WARNING DRV_NAME
1425                        ": %s: Warning: failed to get speed and duplex from %s, "
1426                        "assumed to be 100Mb/sec and Full.\n",
1427                        bond_dev->name, new_slave->dev->name);
1428
1429                 if (bond->params.mode == BOND_MODE_8023AD) {
1430                         printk(KERN_WARNING DRV_NAME
1431                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1432                                "support in base driver for proper aggregator "
1433                                "selection.\n", bond_dev->name);
1434                 }
1435         }
1436
1437         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1438                 /* if there is a primary slave, remember it */
1439                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1440                         bond->primary_slave = new_slave;
1441                 }
1442         }
1443
1444         switch (bond->params.mode) {
1445         case BOND_MODE_ACTIVEBACKUP:
1446                 /* if we're in active-backup mode, we need one and only one active
1447                  * interface. The backup interfaces will have their NOARP flag set
1448                  * because we need them to be completely deaf and not to respond to
1449                  * any ARP request on the network to avoid fooling a switch. Thus,
1450                  * since we guarantee that curr_active_slave always point to the last
1451                  * usable interface, we just have to verify this interface's flag.
1452                  */
1453                 if (((!bond->curr_active_slave) ||
1454                      (bond->curr_active_slave->dev->flags & IFF_NOARP)) &&
1455                     (new_slave->link != BOND_LINK_DOWN)) {
1456                         dprintk("This is the first active slave\n");
1457                         /* first slave or no active slave yet, and this link
1458                            is OK, so make this interface the active one */
1459                         bond_change_active_slave(bond, new_slave);
1460                 } else {
1461                         dprintk("This is just a backup slave\n");
1462                         bond_set_slave_inactive_flags(new_slave);
1463                 }
1464                 break;
1465         case BOND_MODE_8023AD:
1466                 /* in 802.3ad mode, the internal mechanism
1467                  * will activate the slaves in the selected
1468                  * aggregator
1469                  */
1470                 bond_set_slave_inactive_flags(new_slave);
1471                 /* if this is the first slave */
1472                 if (bond->slave_cnt == 1) {
1473                         SLAVE_AD_INFO(new_slave).id = 1;
1474                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1475                          * can be called only after the mac address of the bond is set
1476                          */
1477                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1478                                             bond->params.lacp_fast);
1479                 } else {
1480                         SLAVE_AD_INFO(new_slave).id =
1481                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1482                 }
1483
1484                 bond_3ad_bind_slave(new_slave);
1485                 break;
1486         case BOND_MODE_TLB:
1487         case BOND_MODE_ALB:
1488                 new_slave->state = BOND_STATE_ACTIVE;
1489                 if ((!bond->curr_active_slave) &&
1490                     (new_slave->link != BOND_LINK_DOWN)) {
1491                         /* first slave or no active slave yet, and this link
1492                          * is OK, so make this interface the active one
1493                          */
1494                         bond_change_active_slave(bond, new_slave);
1495                 }
1496                 break;
1497         default:
1498                 dprintk("This slave is always active in trunk mode\n");
1499
1500                 /* always active in trunk mode */
1501                 new_slave->state = BOND_STATE_ACTIVE;
1502
1503                 /* In trunking mode there is little meaning to curr_active_slave
1504                  * anyway (it holds no special properties of the bond device),
1505                  * so we can change it without calling change_active_interface()
1506                  */
1507                 if (!bond->curr_active_slave) {
1508                         bond->curr_active_slave = new_slave;
1509                 }
1510                 break;
1511         } /* switch(bond_mode) */
1512
1513         write_unlock_bh(&bond->lock);
1514
1515         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1516         if (res)
1517                 goto err_unset_master;
1518
1519         printk(KERN_INFO DRV_NAME
1520                ": %s: enslaving %s as a%s interface with a%s link.\n",
1521                bond_dev->name, slave_dev->name,
1522                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1523                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1524
1525         /* enslave is successful */
1526         return 0;
1527
1528 /* Undo stages on error */
1529 err_unset_master:
1530         netdev_set_master(slave_dev, NULL);
1531
1532 err_close:
1533         dev_close(slave_dev);
1534
1535 err_restore_mac:
1536         memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1537         addr.sa_family = slave_dev->type;
1538         dev_set_mac_address(slave_dev, &addr);
1539
1540 err_free:
1541         kfree(new_slave);
1542
1543 err_undo_flags:
1544         bond_dev->features = old_features;
1545
1546         return res;
1547 }
1548
1549 /*
1550  * Try to release the slave device <slave> from the bond device <master>
1551  * It is legal to access curr_active_slave without a lock because all the function
1552  * is write-locked.
1553  *
1554  * The rules for slave state should be:
1555  *   for Active/Backup:
1556  *     Active stays on all backups go down
1557  *   for Bonded connections:
1558  *     The first up interface should be left on and all others downed.
1559  */
1560 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1561 {
1562         struct bonding *bond = bond_dev->priv;
1563         struct slave *slave, *oldcurrent;
1564         struct sockaddr addr;
1565         int mac_addr_differ;
1566
1567         /* slave is not a slave or master is not master of this slave */
1568         if (!(slave_dev->flags & IFF_SLAVE) ||
1569             (slave_dev->master != bond_dev)) {
1570                 printk(KERN_ERR DRV_NAME
1571                        ": %s: Error: cannot release %s.\n",
1572                        bond_dev->name, slave_dev->name);
1573                 return -EINVAL;
1574         }
1575
1576         write_lock_bh(&bond->lock);
1577
1578         slave = bond_get_slave_by_dev(bond, slave_dev);
1579         if (!slave) {
1580                 /* not a slave of this bond */
1581                 printk(KERN_INFO DRV_NAME
1582                        ": %s: %s not enslaved\n",
1583                        bond_dev->name, slave_dev->name);
1584                 return -EINVAL;
1585         }
1586
1587         mac_addr_differ = memcmp(bond_dev->dev_addr,
1588                                  slave->perm_hwaddr,
1589                                  ETH_ALEN);
1590         if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1591                 printk(KERN_WARNING DRV_NAME
1592                        ": %s: Warning: the permanent HWaddr of %s "
1593                        "- %02X:%02X:%02X:%02X:%02X:%02X - is "
1594                        "still in use by %s. Set the HWaddr of "
1595                        "%s to a different address to avoid "
1596                        "conflicts.\n",
1597                        bond_dev->name,
1598                        slave_dev->name,
1599                        slave->perm_hwaddr[0],
1600                        slave->perm_hwaddr[1],
1601                        slave->perm_hwaddr[2],
1602                        slave->perm_hwaddr[3],
1603                        slave->perm_hwaddr[4],
1604                        slave->perm_hwaddr[5],
1605                        bond_dev->name,
1606                        slave_dev->name);
1607         }
1608
1609         /* Inform AD package of unbinding of slave. */
1610         if (bond->params.mode == BOND_MODE_8023AD) {
1611                 /* must be called before the slave is
1612                  * detached from the list
1613                  */
1614                 bond_3ad_unbind_slave(slave);
1615         }
1616
1617         printk(KERN_INFO DRV_NAME
1618                ": %s: releasing %s interface %s\n",
1619                bond_dev->name,
1620                (slave->state == BOND_STATE_ACTIVE)
1621                ? "active" : "backup",
1622                slave_dev->name);
1623
1624         oldcurrent = bond->curr_active_slave;
1625
1626         bond->current_arp_slave = NULL;
1627
1628         /* release the slave from its bond */
1629         bond_detach_slave(bond, slave);
1630
1631         bond_compute_features(bond);
1632
1633         if (bond->primary_slave == slave) {
1634                 bond->primary_slave = NULL;
1635         }
1636
1637         if (oldcurrent == slave) {
1638                 bond_change_active_slave(bond, NULL);
1639         }
1640
1641         if ((bond->params.mode == BOND_MODE_TLB) ||
1642             (bond->params.mode == BOND_MODE_ALB)) {
1643                 /* Must be called only after the slave has been
1644                  * detached from the list and the curr_active_slave
1645                  * has been cleared (if our_slave == old_current),
1646                  * but before a new active slave is selected.
1647                  */
1648                 bond_alb_deinit_slave(bond, slave);
1649         }
1650
1651         if (oldcurrent == slave) {
1652                 bond_select_active_slave(bond);
1653
1654                 if (!bond->curr_active_slave) {
1655                         printk(KERN_INFO DRV_NAME
1656                                ": %s: now running without any active "
1657                                "interface !\n",
1658                                bond_dev->name);
1659                 }
1660         }
1661
1662         if (bond->slave_cnt == 0) {
1663                 /* if the last slave was removed, zero the mac address
1664                  * of the master so it will be set by the application
1665                  * to the mac address of the first slave
1666                  */
1667                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1668
1669                 if (list_empty(&bond->vlan_list)) {
1670                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1671                 } else {
1672                         printk(KERN_WARNING DRV_NAME
1673                                ": %s: Warning: clearing HW address of %s while it "
1674                                "still has VLANs.\n",
1675                                bond_dev->name, bond_dev->name);
1676                         printk(KERN_WARNING DRV_NAME
1677                                ": %s: When re-adding slaves, make sure the bond's "
1678                                "HW address matches its VLANs'.\n",
1679                                bond_dev->name);
1680                 }
1681         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1682                    !bond_has_challenged_slaves(bond)) {
1683                 printk(KERN_INFO DRV_NAME
1684                        ": %s: last VLAN challenged slave %s "
1685                        "left bond %s. VLAN blocking is removed\n",
1686                        bond_dev->name, slave_dev->name, bond_dev->name);
1687                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1688         }
1689
1690         write_unlock_bh(&bond->lock);
1691
1692         /* must do this from outside any spinlocks */
1693         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1694
1695         bond_del_vlans_from_slave(bond, slave_dev);
1696
1697         /* If the mode USES_PRIMARY, then we should only remove its
1698          * promisc and mc settings if it was the curr_active_slave, but that was
1699          * already taken care of above when we detached the slave
1700          */
1701         if (!USES_PRIMARY(bond->params.mode)) {
1702                 /* unset promiscuity level from slave */
1703                 if (bond_dev->flags & IFF_PROMISC) {
1704                         dev_set_promiscuity(slave_dev, -1);
1705                 }
1706
1707                 /* unset allmulti level from slave */
1708                 if (bond_dev->flags & IFF_ALLMULTI) {
1709                         dev_set_allmulti(slave_dev, -1);
1710                 }
1711
1712                 /* flush master's mc_list from slave */
1713                 bond_mc_list_flush(bond_dev, slave_dev);
1714         }
1715
1716         netdev_set_master(slave_dev, NULL);
1717
1718         /* close slave before restoring its mac address */
1719         dev_close(slave_dev);
1720
1721         /* restore original ("permanent") mac address */
1722         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1723         addr.sa_family = slave_dev->type;
1724         dev_set_mac_address(slave_dev, &addr);
1725
1726         /* restore the original state of the
1727          * IFF_NOARP flag that might have been
1728          * set by bond_set_slave_inactive_flags()
1729          */
1730         if ((slave->original_flags & IFF_NOARP) == 0) {
1731                 slave_dev->flags &= ~IFF_NOARP;
1732         }
1733
1734         kfree(slave);
1735
1736         return 0;  /* deletion OK */
1737 }
1738
1739 /*
1740  * This function releases all slaves.
1741  */
1742 static int bond_release_all(struct net_device *bond_dev)
1743 {
1744         struct bonding *bond = bond_dev->priv;
1745         struct slave *slave;
1746         struct net_device *slave_dev;
1747         struct sockaddr addr;
1748
1749         write_lock_bh(&bond->lock);
1750
1751         if (bond->slave_cnt == 0) {
1752                 goto out;
1753         }
1754
1755         bond->current_arp_slave = NULL;
1756         bond->primary_slave = NULL;
1757         bond_change_active_slave(bond, NULL);
1758
1759         while ((slave = bond->first_slave) != NULL) {
1760                 /* Inform AD package of unbinding of slave
1761                  * before slave is detached from the list.
1762                  */
1763                 if (bond->params.mode == BOND_MODE_8023AD) {
1764                         bond_3ad_unbind_slave(slave);
1765                 }
1766
1767                 slave_dev = slave->dev;
1768                 bond_detach_slave(bond, slave);
1769
1770                 if ((bond->params.mode == BOND_MODE_TLB) ||
1771                     (bond->params.mode == BOND_MODE_ALB)) {
1772                         /* must be called only after the slave
1773                          * has been detached from the list
1774                          */
1775                         bond_alb_deinit_slave(bond, slave);
1776                 }
1777
1778                 bond_compute_features(bond);
1779
1780                 /* now that the slave is detached, unlock and perform
1781                  * all the undo steps that should not be called from
1782                  * within a lock.
1783                  */
1784                 write_unlock_bh(&bond->lock);
1785
1786                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1787                 bond_del_vlans_from_slave(bond, slave_dev);
1788
1789                 /* If the mode USES_PRIMARY, then we should only remove its
1790                  * promisc and mc settings if it was the curr_active_slave, but that was
1791                  * already taken care of above when we detached the slave
1792                  */
1793                 if (!USES_PRIMARY(bond->params.mode)) {
1794                         /* unset promiscuity level from slave */
1795                         if (bond_dev->flags & IFF_PROMISC) {
1796                                 dev_set_promiscuity(slave_dev, -1);
1797                         }
1798
1799                         /* unset allmulti level from slave */
1800                         if (bond_dev->flags & IFF_ALLMULTI) {
1801                                 dev_set_allmulti(slave_dev, -1);
1802                         }
1803
1804                         /* flush master's mc_list from slave */
1805                         bond_mc_list_flush(bond_dev, slave_dev);
1806                 }
1807
1808                 netdev_set_master(slave_dev, NULL);
1809
1810                 /* close slave before restoring its mac address */
1811                 dev_close(slave_dev);
1812
1813                 /* restore original ("permanent") mac address*/
1814                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1815                 addr.sa_family = slave_dev->type;
1816                 dev_set_mac_address(slave_dev, &addr);
1817
1818                 /* restore the original state of the IFF_NOARP flag that might have
1819                  * been set by bond_set_slave_inactive_flags()
1820                  */
1821                 if ((slave->original_flags & IFF_NOARP) == 0) {
1822                         slave_dev->flags &= ~IFF_NOARP;
1823                 }
1824
1825                 kfree(slave);
1826
1827                 /* re-acquire the lock before getting the next slave */
1828                 write_lock_bh(&bond->lock);
1829         }
1830
1831         /* zero the mac address of the master so it will be
1832          * set by the application to the mac address of the
1833          * first slave
1834          */
1835         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1836
1837         if (list_empty(&bond->vlan_list)) {
1838                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1839         } else {
1840                 printk(KERN_WARNING DRV_NAME
1841                        ": %s: Warning: clearing HW address of %s while it "
1842                        "still has VLANs.\n",
1843                        bond_dev->name, bond_dev->name);
1844                 printk(KERN_WARNING DRV_NAME
1845                        ": %s: When re-adding slaves, make sure the bond's "
1846                        "HW address matches its VLANs'.\n",
1847                        bond_dev->name);
1848         }
1849
1850         printk(KERN_INFO DRV_NAME
1851                ": %s: released all slaves\n",
1852                bond_dev->name);
1853
1854 out:
1855         write_unlock_bh(&bond->lock);
1856
1857         return 0;
1858 }
1859
1860 /*
1861  * This function changes the active slave to slave <slave_dev>.
1862  * It returns -EINVAL in the following cases.
1863  *  - <slave_dev> is not found in the list.
1864  *  - There is not active slave now.
1865  *  - <slave_dev> is already active.
1866  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1867  *  - <slave_dev> is not running.
1868  * In these cases, this fuction does nothing.
1869  * In the other cases, currnt_slave pointer is changed and 0 is returned.
1870  */
1871 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1872 {
1873         struct bonding *bond = bond_dev->priv;
1874         struct slave *old_active = NULL;
1875         struct slave *new_active = NULL;
1876         int res = 0;
1877
1878         if (!USES_PRIMARY(bond->params.mode)) {
1879                 return -EINVAL;
1880         }
1881
1882         /* Verify that master_dev is indeed the master of slave_dev */
1883         if (!(slave_dev->flags & IFF_SLAVE) ||
1884             (slave_dev->master != bond_dev)) {
1885                 return -EINVAL;
1886         }
1887
1888         write_lock_bh(&bond->lock);
1889
1890         old_active = bond->curr_active_slave;
1891         new_active = bond_get_slave_by_dev(bond, slave_dev);
1892
1893         /*
1894          * Changing to the current active: do nothing; return success.
1895          */
1896         if (new_active && (new_active == old_active)) {
1897                 write_unlock_bh(&bond->lock);
1898                 return 0;
1899         }
1900
1901         if ((new_active) &&
1902             (old_active) &&
1903             (new_active->link == BOND_LINK_UP) &&
1904             IS_UP(new_active->dev)) {
1905                 bond_change_active_slave(bond, new_active);
1906         } else {
1907                 res = -EINVAL;
1908         }
1909
1910         write_unlock_bh(&bond->lock);
1911
1912         return res;
1913 }
1914
1915 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1916 {
1917         struct bonding *bond = bond_dev->priv;
1918
1919         info->bond_mode = bond->params.mode;
1920         info->miimon = bond->params.miimon;
1921
1922         read_lock_bh(&bond->lock);
1923         info->num_slaves = bond->slave_cnt;
1924         read_unlock_bh(&bond->lock);
1925
1926         return 0;
1927 }
1928
1929 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1930 {
1931         struct bonding *bond = bond_dev->priv;
1932         struct slave *slave;
1933         int i, found = 0;
1934
1935         if (info->slave_id < 0) {
1936                 return -ENODEV;
1937         }
1938
1939         read_lock_bh(&bond->lock);
1940
1941         bond_for_each_slave(bond, slave, i) {
1942                 if (i == (int)info->slave_id) {
1943                         found = 1;
1944                         break;
1945                 }
1946         }
1947
1948         read_unlock_bh(&bond->lock);
1949
1950         if (found) {
1951                 strcpy(info->slave_name, slave->dev->name);
1952                 info->link = slave->link;
1953                 info->state = slave->state;
1954                 info->link_failure_count = slave->link_failure_count;
1955         } else {
1956                 return -ENODEV;
1957         }
1958
1959         return 0;
1960 }
1961
1962 /*-------------------------------- Monitoring -------------------------------*/
1963
1964 /* this function is called regularly to monitor each slave's link. */
1965 void bond_mii_monitor(struct net_device *bond_dev)
1966 {
1967         struct bonding *bond = bond_dev->priv;
1968         struct slave *slave, *oldcurrent;
1969         int do_failover = 0;
1970         int delta_in_ticks;
1971         int i;
1972
1973         read_lock(&bond->lock);
1974
1975         delta_in_ticks = (bond->params.miimon * HZ) / 1000;
1976
1977         if (bond->kill_timers) {
1978                 goto out;
1979         }
1980
1981         if (bond->slave_cnt == 0) {
1982                 goto re_arm;
1983         }
1984
1985         /* we will try to read the link status of each of our slaves, and
1986          * set their IFF_RUNNING flag appropriately. For each slave not
1987          * supporting MII status, we won't do anything so that a user-space
1988          * program could monitor the link itself if needed.
1989          */
1990
1991         read_lock(&bond->curr_slave_lock);
1992         oldcurrent = bond->curr_active_slave;
1993         read_unlock(&bond->curr_slave_lock);
1994
1995         bond_for_each_slave(bond, slave, i) {
1996                 struct net_device *slave_dev = slave->dev;
1997                 int link_state;
1998                 u16 old_speed = slave->speed;
1999                 u8 old_duplex = slave->duplex;
2000
2001                 link_state = bond_check_dev_link(bond, slave_dev, 0);
2002
2003                 switch (slave->link) {
2004                 case BOND_LINK_UP:      /* the link was up */
2005                         if (link_state == BMSR_LSTATUS) {
2006                                 /* link stays up, nothing more to do */
2007                                 break;
2008                         } else { /* link going down */
2009                                 slave->link  = BOND_LINK_FAIL;
2010                                 slave->delay = bond->params.downdelay;
2011
2012                                 if (slave->link_failure_count < UINT_MAX) {
2013                                         slave->link_failure_count++;
2014                                 }
2015
2016                                 if (bond->params.downdelay) {
2017                                         printk(KERN_INFO DRV_NAME
2018                                                ": %s: link status down for %s "
2019                                                "interface %s, disabling it in "
2020                                                "%d ms.\n",
2021                                                bond_dev->name,
2022                                                IS_UP(slave_dev)
2023                                                ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2024                                                   ? ((slave == oldcurrent)
2025                                                      ? "active " : "backup ")
2026                                                   : "")
2027                                                : "idle ",
2028                                                slave_dev->name,
2029                                                bond->params.downdelay * bond->params.miimon);
2030                                 }
2031                         }
2032                         /* no break ! fall through the BOND_LINK_FAIL test to
2033                            ensure proper action to be taken
2034                         */
2035                 case BOND_LINK_FAIL:    /* the link has just gone down */
2036                         if (link_state != BMSR_LSTATUS) {
2037                                 /* link stays down */
2038                                 if (slave->delay <= 0) {
2039                                         /* link down for too long time */
2040                                         slave->link = BOND_LINK_DOWN;
2041
2042                                         /* in active/backup mode, we must
2043                                          * completely disable this interface
2044                                          */
2045                                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2046                                             (bond->params.mode == BOND_MODE_8023AD)) {
2047                                                 bond_set_slave_inactive_flags(slave);
2048                                         }
2049
2050                                         printk(KERN_INFO DRV_NAME
2051                                                ": %s: link status definitely "
2052                                                "down for interface %s, "
2053                                                "disabling it\n",
2054                                                bond_dev->name,
2055                                                slave_dev->name);
2056
2057                                         /* notify ad that the link status has changed */
2058                                         if (bond->params.mode == BOND_MODE_8023AD) {
2059                                                 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2060                                         }
2061
2062                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2063                                             (bond->params.mode == BOND_MODE_ALB)) {
2064                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2065                                         }
2066
2067                                         if (slave == oldcurrent) {
2068                                                 do_failover = 1;
2069                                         }
2070                                 } else {
2071                                         slave->delay--;
2072                                 }
2073                         } else {
2074                                 /* link up again */
2075                                 slave->link  = BOND_LINK_UP;
2076                                 slave->jiffies = jiffies;
2077                                 printk(KERN_INFO DRV_NAME
2078                                        ": %s: link status up again after %d "
2079                                        "ms for interface %s.\n",
2080                                        bond_dev->name,
2081                                        (bond->params.downdelay - slave->delay) * bond->params.miimon,
2082                                        slave_dev->name);
2083                         }
2084                         break;
2085                 case BOND_LINK_DOWN:    /* the link was down */
2086                         if (link_state != BMSR_LSTATUS) {
2087                                 /* the link stays down, nothing more to do */
2088                                 break;
2089                         } else {        /* link going up */
2090                                 slave->link  = BOND_LINK_BACK;
2091                                 slave->delay = bond->params.updelay;
2092
2093                                 if (bond->params.updelay) {
2094                                         /* if updelay == 0, no need to
2095                                            advertise about a 0 ms delay */
2096                                         printk(KERN_INFO DRV_NAME
2097                                                ": %s: link status up for "
2098                                                "interface %s, enabling it "
2099                                                "in %d ms.\n",
2100                                                bond_dev->name,
2101                                                slave_dev->name,
2102                                                bond->params.updelay * bond->params.miimon);
2103                                 }
2104                         }
2105                         /* no break ! fall through the BOND_LINK_BACK state in
2106                            case there's something to do.
2107                         */
2108                 case BOND_LINK_BACK:    /* the link has just come back */
2109                         if (link_state != BMSR_LSTATUS) {
2110                                 /* link down again */
2111                                 slave->link  = BOND_LINK_DOWN;
2112
2113                                 printk(KERN_INFO DRV_NAME
2114                                        ": %s: link status down again after %d "
2115                                        "ms for interface %s.\n",
2116                                        bond_dev->name,
2117                                        (bond->params.updelay - slave->delay) * bond->params.miimon,
2118                                        slave_dev->name);
2119                         } else {
2120                                 /* link stays up */
2121                                 if (slave->delay == 0) {
2122                                         /* now the link has been up for long time enough */
2123                                         slave->link = BOND_LINK_UP;
2124                                         slave->jiffies = jiffies;
2125
2126                                         if (bond->params.mode == BOND_MODE_8023AD) {
2127                                                 /* prevent it from being the active one */
2128                                                 slave->state = BOND_STATE_BACKUP;
2129                                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2130                                                 /* make it immediately active */
2131                                                 slave->state = BOND_STATE_ACTIVE;
2132                                         } else if (slave != bond->primary_slave) {
2133                                                 /* prevent it from being the active one */
2134                                                 slave->state = BOND_STATE_BACKUP;
2135                                         }
2136
2137                                         printk(KERN_INFO DRV_NAME
2138                                                ": %s: link status definitely "
2139                                                "up for interface %s.\n",
2140                                                bond_dev->name,
2141                                                slave_dev->name);
2142
2143                                         /* notify ad that the link status has changed */
2144                                         if (bond->params.mode == BOND_MODE_8023AD) {
2145                                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2146                                         }
2147
2148                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2149                                             (bond->params.mode == BOND_MODE_ALB)) {
2150                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2151                                         }
2152
2153                                         if ((!oldcurrent) ||
2154                                             (slave == bond->primary_slave)) {
2155                                                 do_failover = 1;
2156                                         }
2157                                 } else {
2158                                         slave->delay--;
2159                                 }
2160                         }
2161                         break;
2162                 default:
2163                         /* Should not happen */
2164                         printk(KERN_ERR DRV_NAME
2165                                ": %s: Error: %s Illegal value (link=%d)\n",
2166                                bond_dev->name,
2167                                slave->dev->name,
2168                                slave->link);
2169                         goto out;
2170                 } /* end of switch (slave->link) */
2171
2172                 bond_update_speed_duplex(slave);
2173
2174                 if (bond->params.mode == BOND_MODE_8023AD) {
2175                         if (old_speed != slave->speed) {
2176                                 bond_3ad_adapter_speed_changed(slave);
2177                         }
2178
2179                         if (old_duplex != slave->duplex) {
2180                                 bond_3ad_adapter_duplex_changed(slave);
2181                         }
2182                 }
2183
2184         } /* end of for */
2185
2186         if (do_failover) {
2187                 write_lock(&bond->curr_slave_lock);
2188
2189                 bond_select_active_slave(bond);
2190
2191                 if (oldcurrent && !bond->curr_active_slave) {
2192                         printk(KERN_INFO DRV_NAME
2193                                ": %s: now running without any active "
2194                                "interface !\n",
2195                                bond_dev->name);
2196                 }
2197
2198                 write_unlock(&bond->curr_slave_lock);
2199         }
2200
2201 re_arm:
2202         if (bond->params.miimon) {
2203                 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2204         }
2205 out:
2206         read_unlock(&bond->lock);
2207 }
2208
2209
2210 static u32 bond_glean_dev_ip(struct net_device *dev)
2211 {
2212         struct in_device *idev;
2213         struct in_ifaddr *ifa;
2214         u32 addr = 0;
2215
2216         if (!dev)
2217                 return 0;
2218
2219         rcu_read_lock();
2220         idev = __in_dev_get_rcu(dev);
2221         if (!idev)
2222                 goto out;
2223
2224         ifa = idev->ifa_list;
2225         if (!ifa)
2226                 goto out;
2227
2228         addr = ifa->ifa_local;
2229 out:
2230         rcu_read_unlock();
2231         return addr;
2232 }
2233
2234 static int bond_has_ip(struct bonding *bond)
2235 {
2236         struct vlan_entry *vlan, *vlan_next;
2237
2238         if (bond->master_ip)
2239                 return 1;
2240
2241         if (list_empty(&bond->vlan_list))
2242                 return 0;
2243
2244         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2245                                  vlan_list) {
2246                 if (vlan->vlan_ip)
2247                         return 1;
2248         }
2249
2250         return 0;
2251 }
2252
2253 /*
2254  * We go to the (large) trouble of VLAN tagging ARP frames because
2255  * switches in VLAN mode (especially if ports are configured as
2256  * "native" to a VLAN) might not pass non-tagged frames.
2257  */
2258 static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
2259 {
2260         struct sk_buff *skb;
2261
2262         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2263                slave_dev->name, dest_ip, src_ip, vlan_id);
2264
2265         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2266                          NULL, slave_dev->dev_addr, NULL);
2267
2268         if (!skb) {
2269                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2270                 return;
2271         }
2272         if (vlan_id) {
2273                 skb = vlan_put_tag(skb, vlan_id);
2274                 if (!skb) {
2275                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2276                         return;
2277                 }
2278         }
2279         arp_xmit(skb);
2280 }
2281
2282
2283 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2284 {
2285         int i, vlan_id, rv;
2286         u32 *targets = bond->params.arp_targets;
2287         struct vlan_entry *vlan, *vlan_next;
2288         struct net_device *vlan_dev;
2289         struct flowi fl;
2290         struct rtable *rt;
2291
2292         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2293                 if (!targets[i])
2294                         continue;
2295                 dprintk("basa: target %x\n", targets[i]);
2296                 if (list_empty(&bond->vlan_list)) {
2297                         dprintk("basa: empty vlan: arp_send\n");
2298                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2299                                       bond->master_ip, 0);
2300                         continue;
2301                 }
2302
2303                 /*
2304                  * If VLANs are configured, we do a route lookup to
2305                  * determine which VLAN interface would be used, so we
2306                  * can tag the ARP with the proper VLAN tag.
2307                  */
2308                 memset(&fl, 0, sizeof(fl));
2309                 fl.fl4_dst = targets[i];
2310                 fl.fl4_tos = RTO_ONLINK;
2311
2312                 rv = ip_route_output_key(&rt, &fl);
2313                 if (rv) {
2314                         if (net_ratelimit()) {
2315                                 printk(KERN_WARNING DRV_NAME
2316                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2317                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2318                         }
2319                         continue;
2320                 }
2321
2322                 /*
2323                  * This target is not on a VLAN
2324                  */
2325                 if (rt->u.dst.dev == bond->dev) {
2326                         ip_rt_put(rt);
2327                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2328                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2329                                       bond->master_ip, 0);
2330                         continue;
2331                 }
2332
2333                 vlan_id = 0;
2334                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2335                                          vlan_list) {
2336                         vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2337                         if (vlan_dev == rt->u.dst.dev) {
2338                                 vlan_id = vlan->vlan_id;
2339                                 dprintk("basa: vlan match on %s %d\n",
2340                                        vlan_dev->name, vlan_id);
2341                                 break;
2342                         }
2343                 }
2344
2345                 if (vlan_id) {
2346                         ip_rt_put(rt);
2347                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2348                                       vlan->vlan_ip, vlan_id);
2349                         continue;
2350                 }
2351
2352                 if (net_ratelimit()) {
2353                         printk(KERN_WARNING DRV_NAME
2354                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2355                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2356                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2357                 }
2358                 ip_rt_put(rt);
2359         }
2360 }
2361
2362 /*
2363  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2364  * for each VLAN above us.
2365  */
2366 static void bond_send_gratuitous_arp(struct bonding *bond)
2367 {
2368         struct slave *slave = bond->curr_active_slave;
2369         struct vlan_entry *vlan;
2370         struct net_device *vlan_dev;
2371
2372         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2373                                 slave ? slave->dev->name : "NULL");
2374         if (!slave)
2375                 return;
2376
2377         if (bond->master_ip) {
2378                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2379                                   bond->master_ip, 0);
2380         }
2381
2382         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2383                 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2384                 if (vlan->vlan_ip) {
2385                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2386                                       vlan->vlan_ip, vlan->vlan_id);
2387                 }
2388         }
2389 }
2390
2391 /*
2392  * this function is called regularly to monitor each slave's link
2393  * ensuring that traffic is being sent and received when arp monitoring
2394  * is used in load-balancing mode. if the adapter has been dormant, then an
2395  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2396  * arp monitoring in active backup mode.
2397  */
2398 void bond_loadbalance_arp_mon(struct net_device *bond_dev)
2399 {
2400         struct bonding *bond = bond_dev->priv;
2401         struct slave *slave, *oldcurrent;
2402         int do_failover = 0;
2403         int delta_in_ticks;
2404         int i;
2405
2406         read_lock(&bond->lock);
2407
2408         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2409
2410         if (bond->kill_timers) {
2411                 goto out;
2412         }
2413
2414         if (bond->slave_cnt == 0) {
2415                 goto re_arm;
2416         }
2417
2418         read_lock(&bond->curr_slave_lock);
2419         oldcurrent = bond->curr_active_slave;
2420         read_unlock(&bond->curr_slave_lock);
2421
2422         /* see if any of the previous devices are up now (i.e. they have
2423          * xmt and rcv traffic). the curr_active_slave does not come into
2424          * the picture unless it is null. also, slave->jiffies is not needed
2425          * here because we send an arp on each slave and give a slave as
2426          * long as it needs to get the tx/rx within the delta.
2427          * TODO: what about up/down delay in arp mode? it wasn't here before
2428          *       so it can wait
2429          */
2430         bond_for_each_slave(bond, slave, i) {
2431                 if (slave->link != BOND_LINK_UP) {
2432                         if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2433                             ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2434
2435                                 slave->link  = BOND_LINK_UP;
2436                                 slave->state = BOND_STATE_ACTIVE;
2437
2438                                 /* primary_slave has no meaning in round-robin
2439                                  * mode. the window of a slave being up and
2440                                  * curr_active_slave being null after enslaving
2441                                  * is closed.
2442                                  */
2443                                 if (!oldcurrent) {
2444                                         printk(KERN_INFO DRV_NAME
2445                                                ": %s: link status definitely "
2446                                                "up for interface %s, ",
2447                                                bond_dev->name,
2448                                                slave->dev->name);
2449                                         do_failover = 1;
2450                                 } else {
2451                                         printk(KERN_INFO DRV_NAME
2452                                                ": %s: interface %s is now up\n",
2453                                                bond_dev->name,
2454                                                slave->dev->name);
2455                                 }
2456                         }
2457                 } else {
2458                         /* slave->link == BOND_LINK_UP */
2459
2460                         /* not all switches will respond to an arp request
2461                          * when the source ip is 0, so don't take the link down
2462                          * if we don't know our ip yet
2463                          */
2464                         if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2465                             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2466                              bond_has_ip(bond))) {
2467
2468                                 slave->link  = BOND_LINK_DOWN;
2469                                 slave->state = BOND_STATE_BACKUP;
2470
2471                                 if (slave->link_failure_count < UINT_MAX) {
2472                                         slave->link_failure_count++;
2473                                 }
2474
2475                                 printk(KERN_INFO DRV_NAME
2476                                        ": %s: interface %s is now down.\n",
2477                                        bond_dev->name,
2478                                        slave->dev->name);
2479
2480                                 if (slave == oldcurrent) {
2481                                         do_failover = 1;
2482                                 }
2483                         }
2484                 }
2485
2486                 /* note: if switch is in round-robin mode, all links
2487                  * must tx arp to ensure all links rx an arp - otherwise
2488                  * links may oscillate or not come up at all; if switch is
2489                  * in something like xor mode, there is nothing we can
2490                  * do - all replies will be rx'ed on same link causing slaves
2491                  * to be unstable during low/no traffic periods
2492                  */
2493                 if (IS_UP(slave->dev)) {
2494                         bond_arp_send_all(bond, slave);
2495                 }
2496         }
2497
2498         if (do_failover) {
2499                 write_lock(&bond->curr_slave_lock);
2500
2501                 bond_select_active_slave(bond);
2502
2503                 if (oldcurrent && !bond->curr_active_slave) {
2504                         printk(KERN_INFO DRV_NAME
2505                                ": %s: now running without any active "
2506                                "interface !\n",
2507                                bond_dev->name);
2508                 }
2509
2510                 write_unlock(&bond->curr_slave_lock);
2511         }
2512
2513 re_arm:
2514         if (bond->params.arp_interval) {
2515                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2516         }
2517 out:
2518         read_unlock(&bond->lock);
2519 }
2520
2521 /*
2522  * When using arp monitoring in active-backup mode, this function is
2523  * called to determine if any backup slaves have went down or a new
2524  * current slave needs to be found.
2525  * The backup slaves never generate traffic, they are considered up by merely
2526  * receiving traffic. If the current slave goes down, each backup slave will
2527  * be given the opportunity to tx/rx an arp before being taken down - this
2528  * prevents all slaves from being taken down due to the current slave not
2529  * sending any traffic for the backups to receive. The arps are not necessarily
2530  * necessary, any tx and rx traffic will keep the current slave up. While any
2531  * rx traffic will keep the backup slaves up, the current slave is responsible
2532  * for generating traffic to keep them up regardless of any other traffic they
2533  * may have received.
2534  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2535  */
2536 void bond_activebackup_arp_mon(struct net_device *bond_dev)
2537 {
2538         struct bonding *bond = bond_dev->priv;
2539         struct slave *slave;
2540         int delta_in_ticks;
2541         int i;
2542
2543         read_lock(&bond->lock);
2544
2545         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2546
2547         if (bond->kill_timers) {
2548                 goto out;
2549         }
2550
2551         if (bond->slave_cnt == 0) {
2552                 goto re_arm;
2553         }
2554
2555         /* determine if any slave has come up or any backup slave has
2556          * gone down
2557          * TODO: what about up/down delay in arp mode? it wasn't here before
2558          *       so it can wait
2559          */
2560         bond_for_each_slave(bond, slave, i) {
2561                 if (slave->link != BOND_LINK_UP) {
2562                         if ((jiffies - slave->dev->last_rx) <= delta_in_ticks) {
2563
2564                                 slave->link = BOND_LINK_UP;
2565
2566                                 write_lock(&bond->curr_slave_lock);
2567
2568                                 if ((!bond->curr_active_slave) &&
2569                                     ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2570                                         bond_change_active_slave(bond, slave);
2571                                         bond->current_arp_slave = NULL;
2572                                 } else if (bond->curr_active_slave != slave) {
2573                                         /* this slave has just come up but we
2574                                          * already have a current slave; this
2575                                          * can also happen if bond_enslave adds
2576                                          * a new slave that is up while we are
2577                                          * searching for a new slave
2578                                          */
2579                                         bond_set_slave_inactive_flags(slave);
2580                                         bond->current_arp_slave = NULL;
2581                                 }
2582
2583                                 if (slave == bond->curr_active_slave) {
2584                                         printk(KERN_INFO DRV_NAME
2585                                                ": %s: %s is up and now the "
2586                                                "active interface\n",
2587                                                bond_dev->name,
2588                                                slave->dev->name);
2589                                 } else {
2590                                         printk(KERN_INFO DRV_NAME
2591                                                ": %s: backup interface %s is "
2592                                                "now up\n",
2593                                                bond_dev->name,
2594                                                slave->dev->name);
2595                                 }
2596
2597                                 write_unlock(&bond->curr_slave_lock);
2598                         }
2599                 } else {
2600                         read_lock(&bond->curr_slave_lock);
2601
2602                         if ((slave != bond->curr_active_slave) &&
2603                             (!bond->current_arp_slave) &&
2604                             (((jiffies - slave->dev->last_rx) >= 3*delta_in_ticks) &&
2605                              bond_has_ip(bond))) {
2606                                 /* a backup slave has gone down; three times
2607                                  * the delta allows the current slave to be
2608                                  * taken out before the backup slave.
2609                                  * note: a non-null current_arp_slave indicates
2610                                  * the curr_active_slave went down and we are
2611                                  * searching for a new one; under this
2612                                  * condition we only take the curr_active_slave
2613                                  * down - this gives each slave a chance to
2614                                  * tx/rx traffic before being taken out
2615                                  */
2616
2617                                 read_unlock(&bond->curr_slave_lock);
2618
2619                                 slave->link  = BOND_LINK_DOWN;
2620
2621                                 if (slave->link_failure_count < UINT_MAX) {
2622                                         slave->link_failure_count++;
2623                                 }
2624
2625                                 bond_set_slave_inactive_flags(slave);
2626
2627                                 printk(KERN_INFO DRV_NAME
2628                                        ": %s: backup interface %s is now down\n",
2629                                        bond_dev->name,
2630                                        slave->dev->name);
2631                         } else {
2632                                 read_unlock(&bond->curr_slave_lock);
2633                         }
2634                 }
2635         }
2636
2637         read_lock(&bond->curr_slave_lock);
2638         slave = bond->curr_active_slave;
2639         read_unlock(&bond->curr_slave_lock);
2640
2641         if (slave) {
2642                 /* if we have sent traffic in the past 2*arp_intervals but
2643                  * haven't xmit and rx traffic in that time interval, select
2644                  * a different slave. slave->jiffies is only updated when
2645                  * a slave first becomes the curr_active_slave - not necessarily
2646                  * after every arp; this ensures the slave has a full 2*delta
2647                  * before being taken out. if a primary is being used, check
2648                  * if it is up and needs to take over as the curr_active_slave
2649                  */
2650                 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2651             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2652              bond_has_ip(bond))) &&
2653                     ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2654
2655                         slave->link  = BOND_LINK_DOWN;
2656
2657                         if (slave->link_failure_count < UINT_MAX) {
2658                                 slave->link_failure_count++;
2659                         }
2660
2661                         printk(KERN_INFO DRV_NAME
2662                                ": %s: link status down for active interface "
2663                                "%s, disabling it\n",
2664                                bond_dev->name,
2665                                slave->dev->name);
2666
2667                         write_lock(&bond->curr_slave_lock);
2668
2669                         bond_select_active_slave(bond);
2670                         slave = bond->curr_active_slave;
2671
2672                         write_unlock(&bond->curr_slave_lock);
2673
2674                         bond->current_arp_slave = slave;
2675
2676                         if (slave) {
2677                                 slave->jiffies = jiffies;
2678                         }
2679                 } else if ((bond->primary_slave) &&
2680                            (bond->primary_slave != slave) &&
2681                            (bond->primary_slave->link == BOND_LINK_UP)) {
2682                         /* at this point, slave is the curr_active_slave */
2683                         printk(KERN_INFO DRV_NAME
2684                                ": %s: changing from interface %s to primary "
2685                                "interface %s\n",
2686                                bond_dev->name,
2687                                slave->dev->name,
2688                                bond->primary_slave->dev->name);
2689
2690                         /* primary is up so switch to it */
2691                         write_lock(&bond->curr_slave_lock);
2692                         bond_change_active_slave(bond, bond->primary_slave);
2693                         write_unlock(&bond->curr_slave_lock);
2694
2695                         slave = bond->primary_slave;
2696                         slave->jiffies = jiffies;
2697                 } else {
2698                         bond->current_arp_slave = NULL;
2699                 }
2700
2701                 /* the current slave must tx an arp to ensure backup slaves
2702                  * rx traffic
2703                  */
2704                 if (slave && bond_has_ip(bond)) {
2705                         bond_arp_send_all(bond, slave);
2706                 }
2707         }
2708
2709         /* if we don't have a curr_active_slave, search for the next available
2710          * backup slave from the current_arp_slave and make it the candidate
2711          * for becoming the curr_active_slave
2712          */
2713         if (!slave) {
2714                 if (!bond->current_arp_slave) {
2715                         bond->current_arp_slave = bond->first_slave;
2716                 }
2717
2718                 if (bond->current_arp_slave) {
2719                         bond_set_slave_inactive_flags(bond->current_arp_slave);
2720
2721                         /* search for next candidate */
2722                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2723                                 if (IS_UP(slave->dev)) {
2724                                         slave->link = BOND_LINK_BACK;
2725                                         bond_set_slave_active_flags(slave);
2726                                         bond_arp_send_all(bond, slave);
2727                                         slave->jiffies = jiffies;
2728                                         bond->current_arp_slave = slave;
2729                                         break;
2730                                 }
2731
2732                                 /* if the link state is up at this point, we
2733                                  * mark it down - this can happen if we have
2734                                  * simultaneous link failures and
2735                                  * reselect_active_interface doesn't make this
2736                                  * one the current slave so it is still marked
2737                                  * up when it is actually down
2738                                  */
2739                                 if (slave->link == BOND_LINK_UP) {
2740                                         slave->link  = BOND_LINK_DOWN;
2741                                         if (slave->link_failure_count < UINT_MAX) {
2742                                                 slave->link_failure_count++;
2743                                         }
2744
2745                                         bond_set_slave_inactive_flags(slave);
2746
2747                                         printk(KERN_INFO DRV_NAME
2748                                                ": %s: backup interface %s is "
2749                                                "now down.\n",
2750                                                bond_dev->name,
2751                                                slave->dev->name);
2752                                 }
2753                         }
2754                 }
2755         }
2756
2757 re_arm:
2758         if (bond->params.arp_interval) {
2759                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2760         }
2761 out:
2762         read_unlock(&bond->lock);
2763 }
2764
2765 /*------------------------------ proc/seq_file-------------------------------*/
2766
2767 #ifdef CONFIG_PROC_FS
2768
2769 #define SEQ_START_TOKEN ((void *)1)
2770
2771 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2772 {
2773         struct bonding *bond = seq->private;
2774         loff_t off = 0;
2775         struct slave *slave;
2776         int i;
2777
2778         /* make sure the bond won't be taken away */
2779         read_lock(&dev_base_lock);
2780         read_lock_bh(&bond->lock);
2781
2782         if (*pos == 0) {
2783                 return SEQ_START_TOKEN;
2784         }
2785
2786         bond_for_each_slave(bond, slave, i) {
2787                 if (++off == *pos) {
2788                         return slave;
2789                 }
2790         }
2791
2792         return NULL;
2793 }
2794
2795 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2796 {
2797         struct bonding *bond = seq->private;
2798         struct slave *slave = v;
2799
2800         ++*pos;
2801         if (v == SEQ_START_TOKEN) {
2802                 return bond->first_slave;
2803         }
2804
2805         slave = slave->next;
2806
2807         return (slave == bond->first_slave) ? NULL : slave;
2808 }
2809
2810 static void bond_info_seq_stop(struct seq_file *seq, void *v)
2811 {
2812         struct bonding *bond = seq->private;
2813
2814         read_unlock_bh(&bond->lock);
2815         read_unlock(&dev_base_lock);
2816 }
2817
2818 static void bond_info_show_master(struct seq_file *seq)
2819 {
2820         struct bonding *bond = seq->private;
2821         struct slave *curr;
2822         int i;
2823         u32 target;
2824
2825         read_lock(&bond->curr_slave_lock);
2826         curr = bond->curr_active_slave;
2827         read_unlock(&bond->curr_slave_lock);
2828
2829         seq_printf(seq, "Bonding Mode: %s\n",
2830                    bond_mode_name(bond->params.mode));
2831
2832         if (bond->params.mode == BOND_MODE_XOR ||
2833                 bond->params.mode == BOND_MODE_8023AD) {
2834                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2835                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2836                         bond->params.xmit_policy);
2837         }
2838
2839         if (USES_PRIMARY(bond->params.mode)) {
2840                 seq_printf(seq, "Primary Slave: %s\n",
2841                            (bond->primary_slave) ?
2842                            bond->primary_slave->dev->name : "None");
2843
2844                 seq_printf(seq, "Currently Active Slave: %s\n",
2845                            (curr) ? curr->dev->name : "None");
2846         }
2847
2848         seq_printf(seq, "MII Status: %s\n", (curr) ? "up" : "down");
2849         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
2850         seq_printf(seq, "Up Delay (ms): %d\n",
2851                    bond->params.updelay * bond->params.miimon);
2852         seq_printf(seq, "Down Delay (ms): %d\n",
2853                    bond->params.downdelay * bond->params.miimon);
2854
2855
2856         /* ARP information */
2857         if(bond->params.arp_interval > 0) {
2858                 int printed=0;
2859                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
2860                                 bond->params.arp_interval);
2861
2862                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
2863
2864                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
2865                         if (!bond->params.arp_targets[i])
2866                                 continue;
2867                         if (printed)
2868                                 seq_printf(seq, ",");
2869                         target = ntohl(bond->params.arp_targets[i]);
2870                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
2871                         printed = 1;
2872                 }
2873                 seq_printf(seq, "\n");
2874         }
2875
2876         if (bond->params.mode == BOND_MODE_8023AD) {
2877                 struct ad_info ad_info;
2878
2879                 seq_puts(seq, "\n802.3ad info\n");
2880                 seq_printf(seq, "LACP rate: %s\n",
2881                            (bond->params.lacp_fast) ? "fast" : "slow");
2882
2883                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2884                         seq_printf(seq, "bond %s has no active aggregator\n",
2885                                    bond->dev->name);
2886                 } else {
2887                         seq_printf(seq, "Active Aggregator Info:\n");
2888
2889                         seq_printf(seq, "\tAggregator ID: %d\n",
2890                                    ad_info.aggregator_id);
2891                         seq_printf(seq, "\tNumber of ports: %d\n",
2892                                    ad_info.ports);
2893                         seq_printf(seq, "\tActor Key: %d\n",
2894                                    ad_info.actor_key);
2895                         seq_printf(seq, "\tPartner Key: %d\n",
2896                                    ad_info.partner_key);
2897                         seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
2898                                    ad_info.partner_system[0],
2899                                    ad_info.partner_system[1],
2900                                    ad_info.partner_system[2],
2901                                    ad_info.partner_system[3],
2902                                    ad_info.partner_system[4],
2903                                    ad_info.partner_system[5]);
2904                 }
2905         }
2906 }
2907
2908 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
2909 {
2910         struct bonding *bond = seq->private;
2911
2912         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
2913         seq_printf(seq, "MII Status: %s\n",
2914                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
2915         seq_printf(seq, "Link Failure Count: %d\n",
2916                    slave->link_failure_count);
2917
2918         seq_printf(seq,
2919                    "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
2920                    slave->perm_hwaddr[0], slave->perm_hwaddr[1],
2921                    slave->perm_hwaddr[2], slave->perm_hwaddr[3],
2922                    slave->perm_hwaddr[4], slave->perm_hwaddr[5]);
2923
2924         if (bond->params.mode == BOND_MODE_8023AD) {
2925                 const struct aggregator *agg
2926                         = SLAVE_AD_INFO(slave).port.aggregator;
2927
2928                 if (agg) {
2929                         seq_printf(seq, "Aggregator ID: %d\n",
2930                                    agg->aggregator_identifier);
2931                 } else {
2932                         seq_puts(seq, "Aggregator ID: N/A\n");
2933                 }
2934         }
2935 }
2936
2937 static int bond_info_seq_show(struct seq_file *seq, void *v)
2938 {
2939         if (v == SEQ_START_TOKEN) {
2940                 seq_printf(seq, "%s\n", version);
2941                 bond_info_show_master(seq);
2942         } else {
2943                 bond_info_show_slave(seq, v);
2944         }
2945
2946         return 0;
2947 }
2948
2949 static struct seq_operations bond_info_seq_ops = {
2950         .start = bond_info_seq_start,
2951         .next  = bond_info_seq_next,
2952         .stop  = bond_info_seq_stop,
2953         .show  = bond_info_seq_show,
2954 };
2955
2956 static int bond_info_open(struct inode *inode, struct file *file)
2957 {
2958         struct seq_file *seq;
2959         struct proc_dir_entry *proc;
2960         int res;
2961
2962         res = seq_open(file, &bond_info_seq_ops);
2963         if (!res) {
2964                 /* recover the pointer buried in proc_dir_entry data */
2965                 seq = file->private_data;
2966                 proc = PDE(inode);
2967                 seq->private = proc->data;
2968         }
2969
2970         return res;
2971 }
2972
2973 static struct file_operations bond_info_fops = {
2974         .owner   = THIS_MODULE,
2975         .open    = bond_info_open,
2976         .read    = seq_read,
2977         .llseek  = seq_lseek,
2978         .release = seq_release,
2979 };
2980
2981 static int bond_create_proc_entry(struct bonding *bond)
2982 {
2983         struct net_device *bond_dev = bond->dev;
2984
2985         if (bond_proc_dir) {
2986                 bond->proc_entry = create_proc_entry(bond_dev->name,
2987                                                      S_IRUGO,
2988                                                      bond_proc_dir);
2989                 if (bond->proc_entry == NULL) {
2990                         printk(KERN_WARNING DRV_NAME
2991                                ": Warning: Cannot create /proc/net/%s/%s\n",
2992                                DRV_NAME, bond_dev->name);
2993                 } else {
2994                         bond->proc_entry->data = bond;
2995                         bond->proc_entry->proc_fops = &bond_info_fops;
2996                         bond->proc_entry->owner = THIS_MODULE;
2997                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
2998                 }
2999         }
3000
3001         return 0;
3002 }
3003
3004 static void bond_remove_proc_entry(struct bonding *bond)
3005 {
3006         if (bond_proc_dir && bond->proc_entry) {
3007                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3008                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3009                 bond->proc_entry = NULL;
3010         }
3011 }
3012
3013 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3014  * Caller must hold rtnl_lock.
3015  */
3016 static void bond_create_proc_dir(void)
3017 {
3018         int len = strlen(DRV_NAME);
3019
3020         for (bond_proc_dir = proc_net->subdir; bond_proc_dir;
3021              bond_proc_dir = bond_proc_dir->next) {
3022                 if ((bond_proc_dir->namelen == len) &&
3023                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3024                         break;
3025                 }
3026         }
3027
3028         if (!bond_proc_dir) {
3029                 bond_proc_dir = proc_mkdir(DRV_NAME, proc_net);
3030                 if (bond_proc_dir) {
3031                         bond_proc_dir->owner = THIS_MODULE;
3032                 } else {
3033                         printk(KERN_WARNING DRV_NAME
3034                                 ": Warning: cannot create /proc/net/%s\n",
3035                                 DRV_NAME);
3036                 }
3037         }
3038 }
3039
3040 /* Destroy the bonding directory under /proc/net, if empty.
3041  * Caller must hold rtnl_lock.
3042  */
3043 static void bond_destroy_proc_dir(void)
3044 {
3045         struct proc_dir_entry *de;
3046
3047         if (!bond_proc_dir) {
3048                 return;
3049         }
3050
3051         /* verify that the /proc dir is empty */
3052         for (de = bond_proc_dir->subdir; de; de = de->next) {
3053                 /* ignore . and .. */
3054                 if (*(de->name) != '.') {
3055                         break;
3056                 }
3057         }
3058
3059         if (de) {
3060                 if (bond_proc_dir->owner == THIS_MODULE) {
3061                         bond_proc_dir->owner = NULL;
3062                 }
3063         } else {
3064                 remove_proc_entry(DRV_NAME, proc_net);
3065                 bond_proc_dir = NULL;
3066         }
3067 }
3068 #endif /* CONFIG_PROC_FS */
3069
3070 /*-------------------------- netdev event handling --------------------------*/
3071
3072 /*
3073  * Change device name
3074  */
3075 static int bond_event_changename(struct bonding *bond)
3076 {
3077 #ifdef CONFIG_PROC_FS
3078         bond_remove_proc_entry(bond);
3079         bond_create_proc_entry(bond);
3080 #endif
3081         down_write(&(bonding_rwsem));
3082         bond_destroy_sysfs_entry(bond);
3083         bond_create_sysfs_entry(bond);
3084         up_write(&(bonding_rwsem));
3085         return NOTIFY_DONE;
3086 }
3087
3088 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3089 {
3090         struct bonding *event_bond = bond_dev->priv;
3091
3092         switch (event) {
3093         case NETDEV_CHANGENAME:
3094                 return bond_event_changename(event_bond);
3095         case NETDEV_UNREGISTER:
3096                 /*
3097                  * TODO: remove a bond from the list?
3098                  */
3099                 break;
3100         default:
3101                 break;
3102         }
3103
3104         return NOTIFY_DONE;
3105 }
3106
3107 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3108 {
3109         struct net_device *bond_dev = slave_dev->master;
3110         struct bonding *bond = bond_dev->priv;
3111
3112         switch (event) {
3113         case NETDEV_UNREGISTER:
3114                 if (bond_dev) {
3115                         bond_release(bond_dev, slave_dev);
3116                 }
3117                 break;
3118         case NETDEV_CHANGE:
3119                 /*
3120                  * TODO: is this what we get if somebody
3121                  * sets up a hierarchical bond, then rmmod's
3122                  * one of the slave bonding devices?
3123                  */
3124                 break;
3125         case NETDEV_DOWN:
3126                 /*
3127                  * ... Or is it this?
3128                  */
3129                 break;
3130         case NETDEV_CHANGEMTU:
3131                 /*
3132                  * TODO: Should slaves be allowed to
3133                  * independently alter their MTU?  For
3134                  * an active-backup bond, slaves need
3135                  * not be the same type of device, so
3136                  * MTUs may vary.  For other modes,
3137                  * slaves arguably should have the
3138                  * same MTUs. To do this, we'd need to
3139                  * take over the slave's change_mtu
3140                  * function for the duration of their
3141                  * servitude.
3142                  */
3143                 break;
3144         case NETDEV_CHANGENAME:
3145                 /*
3146                  * TODO: handle changing the primary's name
3147                  */
3148                 break;
3149         case NETDEV_FEAT_CHANGE:
3150                 bond_compute_features(bond);
3151                 break;
3152         default:
3153                 break;
3154         }
3155
3156         return NOTIFY_DONE;
3157 }
3158
3159 /*
3160  * bond_netdev_event: handle netdev notifier chain events.
3161  *
3162  * This function receives events for the netdev chain.  The caller (an
3163  * ioctl handler calling notifier_call_chain) holds the necessary
3164  * locks for us to safely manipulate the slave devices (RTNL lock,
3165  * dev_probe_lock).
3166  */
3167 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3168 {
3169         struct net_device *event_dev = (struct net_device *)ptr;
3170
3171         dprintk("event_dev: %s, event: %lx\n",
3172                 (event_dev ? event_dev->name : "None"),
3173                 event);
3174
3175         if (event_dev->flags & IFF_MASTER) {
3176                 dprintk("IFF_MASTER\n");
3177                 return bond_master_netdev_event(event, event_dev);
3178         }
3179
3180         if (event_dev->flags & IFF_SLAVE) {
3181                 dprintk("IFF_SLAVE\n");
3182                 return bond_slave_netdev_event(event, event_dev);
3183         }
3184
3185         return NOTIFY_DONE;
3186 }
3187
3188 /*
3189  * bond_inetaddr_event: handle inetaddr notifier chain events.
3190  *
3191  * We keep track of device IPs primarily to use as source addresses in
3192  * ARP monitor probes (rather than spewing out broadcasts all the time).
3193  *
3194  * We track one IP for the main device (if it has one), plus one per VLAN.
3195  */
3196 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3197 {
3198         struct in_ifaddr *ifa = ptr;
3199         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3200         struct bonding *bond, *bond_next;
3201         struct vlan_entry *vlan, *vlan_next;
3202
3203         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3204                 if (bond->dev == event_dev) {
3205                         switch (event) {
3206                         case NETDEV_UP:
3207                                 bond->master_ip = ifa->ifa_local;
3208                                 return NOTIFY_OK;
3209                         case NETDEV_DOWN:
3210                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3211                                 return NOTIFY_OK;
3212                         default:
3213                                 return NOTIFY_DONE;
3214                         }
3215                 }
3216
3217                 if (list_empty(&bond->vlan_list))
3218                         continue;
3219
3220                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3221                                          vlan_list) {
3222                         vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
3223                         if (vlan_dev == event_dev) {
3224                                 switch (event) {
3225                                 case NETDEV_UP:
3226                                         vlan->vlan_ip = ifa->ifa_local;
3227                                         return NOTIFY_OK;
3228                                 case NETDEV_DOWN:
3229                                         vlan->vlan_ip =
3230                                                 bond_glean_dev_ip(vlan_dev);
3231                                         return NOTIFY_OK;
3232                                 default:
3233                                         return NOTIFY_DONE;
3234                                 }
3235                         }
3236                 }
3237         }
3238         return NOTIFY_DONE;
3239 }
3240
3241 static struct notifier_block bond_netdev_notifier = {
3242         .notifier_call = bond_netdev_event,
3243 };
3244
3245 static struct notifier_block bond_inetaddr_notifier = {
3246         .notifier_call = bond_inetaddr_event,
3247 };
3248
3249 /*-------------------------- Packet type handling ---------------------------*/
3250
3251 /* register to receive lacpdus on a bond */
3252 static void bond_register_lacpdu(struct bonding *bond)
3253 {
3254         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3255
3256         /* initialize packet type */
3257         pk_type->type = PKT_TYPE_LACPDU;
3258         pk_type->dev = bond->dev;
3259         pk_type->func = bond_3ad_lacpdu_recv;
3260
3261         dev_add_pack(pk_type);
3262 }
3263
3264 /* unregister to receive lacpdus on a bond */
3265 static void bond_unregister_lacpdu(struct bonding *bond)
3266 {
3267         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3268 }
3269
3270 /*---------------------------- Hashing Policies -----------------------------*/
3271
3272 /*
3273  * Hash for the the output device based upon layer 3 and layer 4 data. If
3274  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3275  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3276  */
3277 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3278                                     struct net_device *bond_dev, int count)
3279 {
3280         struct ethhdr *data = (struct ethhdr *)skb->data;
3281         struct iphdr *iph = skb->nh.iph;
3282         u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
3283         int layer4_xor = 0;
3284
3285         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3286                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3287                     (iph->protocol == IPPROTO_TCP ||
3288                      iph->protocol == IPPROTO_UDP)) {
3289                         layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
3290                 }
3291                 return (layer4_xor ^
3292                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3293
3294         }
3295
3296         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3297 }
3298
3299 /*
3300  * Hash for the output device based upon layer 2 data
3301  */
3302 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3303                                    struct net_device *bond_dev, int count)
3304 {
3305         struct ethhdr *data = (struct ethhdr *)skb->data;
3306
3307         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3308 }
3309
3310 /*-------------------------- Device entry points ----------------------------*/
3311
3312 static int bond_open(struct net_device *bond_dev)
3313 {
3314         struct bonding *bond = bond_dev->priv;
3315         struct timer_list *mii_timer = &bond->mii_timer;
3316         struct timer_list *arp_timer = &bond->arp_timer;
3317
3318         bond->kill_timers = 0;
3319
3320         if ((bond->params.mode == BOND_MODE_TLB) ||
3321             (bond->params.mode == BOND_MODE_ALB)) {
3322                 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3323
3324                 /* bond_alb_initialize must be called before the timer
3325                  * is started.
3326                  */
3327                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3328                         /* something went wrong - fail the open operation */
3329                         return -1;
3330                 }
3331
3332                 init_timer(alb_timer);
3333                 alb_timer->expires  = jiffies + 1;
3334                 alb_timer->data     = (unsigned long)bond;
3335                 alb_timer->function = (void *)&bond_alb_monitor;
3336                 add_timer(alb_timer);
3337         }
3338
3339         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3340                 init_timer(mii_timer);
3341                 mii_timer->expires  = jiffies + 1;
3342                 mii_timer->data     = (unsigned long)bond_dev;
3343                 mii_timer->function = (void *)&bond_mii_monitor;
3344                 add_timer(mii_timer);
3345         }
3346
3347         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3348                 init_timer(arp_timer);
3349                 arp_timer->expires  = jiffies + 1;
3350                 arp_timer->data     = (unsigned long)bond_dev;
3351                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3352                         arp_timer->function = (void *)&bond_activebackup_arp_mon;
3353                 } else {
3354                         arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3355                 }
3356                 add_timer(arp_timer);
3357         }
3358
3359         if (bond->params.mode == BOND_MODE_8023AD) {
3360                 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3361                 init_timer(ad_timer);
3362                 ad_timer->expires  = jiffies + 1;
3363                 ad_timer->data     = (unsigned long)bond;
3364                 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3365                 add_timer(ad_timer);
3366
3367                 /* register to receive LACPDUs */
3368                 bond_register_lacpdu(bond);
3369         }
3370
3371         return 0;
3372 }
3373
3374 static int bond_close(struct net_device *bond_dev)
3375 {
3376         struct bonding *bond = bond_dev->priv;
3377
3378         if (bond->params.mode == BOND_MODE_8023AD) {
3379                 /* Unregister the receive of LACPDUs */
3380                 bond_unregister_lacpdu(bond);
3381         }
3382
3383         write_lock_bh(&bond->lock);
3384
3385         bond_mc_list_destroy(bond);
3386
3387         /* signal timers not to re-arm */
3388         bond->kill_timers = 1;
3389
3390         write_unlock_bh(&bond->lock);
3391
3392         /* del_timer_sync must run without holding the bond->lock
3393          * because a running timer might be trying to hold it too
3394          */
3395
3396         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3397                 del_timer_sync(&bond->mii_timer);
3398         }
3399
3400         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3401                 del_timer_sync(&bond->arp_timer);
3402         }
3403
3404         switch (bond->params.mode) {
3405         case BOND_MODE_8023AD:
3406                 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3407                 break;
3408         case BOND_MODE_TLB:
3409         case BOND_MODE_ALB:
3410                 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3411                 break;
3412         default:
3413                 break;
3414         }
3415
3416         /* Release the bonded slaves */
3417         bond_release_all(bond_dev);
3418
3419         if ((bond->params.mode == BOND_MODE_TLB) ||
3420             (bond->params.mode == BOND_MODE_ALB)) {
3421                 /* Must be called only after all
3422                  * slaves have been released
3423                  */
3424                 bond_alb_deinitialize(bond);
3425         }
3426
3427         return 0;
3428 }
3429
3430 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3431 {
3432         struct bonding *bond = bond_dev->priv;
3433         struct net_device_stats *stats = &(bond->stats), *sstats;
3434         struct slave *slave;
3435         int i;
3436
3437         memset(stats, 0, sizeof(struct net_device_stats));
3438
3439         read_lock_bh(&bond->lock);
3440
3441         bond_for_each_slave(bond, slave, i) {
3442                 sstats = slave->dev->get_stats(slave->dev);
3443
3444                 stats->rx_packets += sstats->rx_packets;
3445                 stats->rx_bytes += sstats->rx_bytes;
3446                 stats->rx_errors += sstats->rx_errors;
3447                 stats->rx_dropped += sstats->rx_dropped;
3448
3449                 stats->tx_packets += sstats->tx_packets;
3450                 stats->tx_bytes += sstats->tx_bytes;
3451                 stats->tx_errors += sstats->tx_errors;
3452                 stats->tx_dropped += sstats->tx_dropped;
3453
3454                 stats->multicast += sstats->multicast;
3455                 stats->collisions += sstats->collisions;
3456
3457                 stats->rx_length_errors += sstats->rx_length_errors;
3458                 stats->rx_over_errors += sstats->rx_over_errors;
3459                 stats->rx_crc_errors += sstats->rx_crc_errors;
3460                 stats->rx_frame_errors += sstats->rx_frame_errors;
3461                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3462                 stats->rx_missed_errors += sstats->rx_missed_errors;
3463
3464                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3465                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3466                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3467                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3468                 stats->tx_window_errors += sstats->tx_window_errors;
3469         }
3470
3471         read_unlock_bh(&bond->lock);
3472
3473         return stats;
3474 }
3475
3476 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3477 {
3478         struct net_device *slave_dev = NULL;
3479         struct ifbond k_binfo;
3480         struct ifbond __user *u_binfo = NULL;
3481         struct ifslave k_sinfo;
3482         struct ifslave __user *u_sinfo = NULL;
3483         struct mii_ioctl_data *mii = NULL;
3484         int res = 0;
3485
3486         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3487                 bond_dev->name, cmd);
3488
3489         switch (cmd) {
3490         case SIOCGMIIPHY:
3491                 mii = if_mii(ifr);
3492                 if (!mii) {
3493                         return -EINVAL;
3494                 }
3495                 mii->phy_id = 0;
3496                 /* Fall Through */
3497         case SIOCGMIIREG:
3498                 /*
3499                  * We do this again just in case we were called by SIOCGMIIREG
3500                  * instead of SIOCGMIIPHY.
3501                  */
3502                 mii = if_mii(ifr);
3503                 if (!mii) {
3504                         return -EINVAL;
3505                 }
3506
3507                 if (mii->reg_num == 1) {
3508                         struct bonding *bond = bond_dev->priv;
3509                         mii->val_out = 0;
3510                         read_lock_bh(&bond->lock);
3511                         read_lock(&bond->curr_slave_lock);
3512                         if (bond->curr_active_slave) {
3513                                 mii->val_out = BMSR_LSTATUS;
3514                         }
3515                         read_unlock(&bond->curr_slave_lock);
3516                         read_unlock_bh(&bond->lock);
3517                 }
3518
3519                 return 0;
3520         case BOND_INFO_QUERY_OLD:
3521         case SIOCBONDINFOQUERY:
3522                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3523
3524                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3525                         return -EFAULT;
3526                 }
3527
3528                 res = bond_info_query(bond_dev, &k_binfo);
3529                 if (res == 0) {
3530                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3531                                 return -EFAULT;
3532                         }
3533                 }
3534
3535                 return res;
3536         case BOND_SLAVE_INFO_QUERY_OLD:
3537         case SIOCBONDSLAVEINFOQUERY:
3538                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3539
3540                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3541                         return -EFAULT;
3542                 }
3543
3544                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3545                 if (res == 0) {
3546                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3547                                 return -EFAULT;
3548                         }
3549                 }
3550
3551                 return res;
3552         default:
3553                 /* Go on */
3554                 break;
3555         }
3556
3557         if (!capable(CAP_NET_ADMIN)) {
3558                 return -EPERM;
3559         }
3560
3561         down_write(&(bonding_rwsem));
3562         slave_dev = dev_get_by_name(ifr->ifr_slave);
3563
3564         dprintk("slave_dev=%p: \n", slave_dev);
3565
3566         if (!slave_dev) {
3567                 res = -ENODEV;
3568         } else {
3569                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3570                 switch (cmd) {
3571                 case BOND_ENSLAVE_OLD:
3572                 case SIOCBONDENSLAVE:
3573                         res = bond_enslave(bond_dev, slave_dev);
3574                         break;
3575                 case BOND_RELEASE_OLD:
3576                 case SIOCBONDRELEASE:
3577                         res = bond_release(bond_dev, slave_dev);
3578                         break;
3579                 case BOND_SETHWADDR_OLD:
3580                 case SIOCBONDSETHWADDR:
3581                         res = bond_sethwaddr(bond_dev, slave_dev);
3582                         break;
3583                 case BOND_CHANGE_ACTIVE_OLD:
3584                 case SIOCBONDCHANGEACTIVE:
3585                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3586                         break;
3587                 default:
3588                         res = -EOPNOTSUPP;
3589                 }
3590
3591                 dev_put(slave_dev);
3592         }
3593
3594         up_write(&(bonding_rwsem));
3595         return res;
3596 }
3597
3598 static void bond_set_multicast_list(struct net_device *bond_dev)
3599 {
3600         struct bonding *bond = bond_dev->priv;
3601         struct dev_mc_list *dmi;
3602
3603         write_lock_bh(&bond->lock);
3604
3605         /*
3606          * Do promisc before checking multicast_mode
3607          */
3608         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3609                 bond_set_promiscuity(bond, 1);
3610         }
3611
3612         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3613                 bond_set_promiscuity(bond, -1);
3614         }
3615
3616         /* set allmulti flag to slaves */
3617         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3618                 bond_set_allmulti(bond, 1);
3619         }
3620
3621         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3622                 bond_set_allmulti(bond, -1);
3623         }
3624
3625         bond->flags = bond_dev->flags;
3626
3627         /* looking for addresses to add to slaves' mc list */
3628         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3629                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3630                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3631                 }
3632         }
3633
3634         /* looking for addresses to delete from slaves' list */
3635         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3636                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3637                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3638                 }
3639         }
3640
3641         /* save master's multicast list */
3642         bond_mc_list_destroy(bond);
3643         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3644
3645         write_unlock_bh(&bond->lock);
3646 }
3647
3648 /*
3649  * Change the MTU of all of a master's slaves to match the master
3650  */
3651 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3652 {
3653         struct bonding *bond = bond_dev->priv;
3654         struct slave *slave, *stop_at;
3655         int res = 0;
3656         int i;
3657
3658         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3659                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3660
3661         /* Can't hold bond->lock with bh disabled here since
3662          * some base drivers panic. On the other hand we can't
3663          * hold bond->lock without bh disabled because we'll
3664          * deadlock. The only solution is to rely on the fact
3665          * that we're under rtnl_lock here, and the slaves
3666          * list won't change. This doesn't solve the problem
3667          * of setting the slave's MTU while it is
3668          * transmitting, but the assumption is that the base
3669          * driver can handle that.
3670          *
3671          * TODO: figure out a way to safely iterate the slaves
3672          * list, but without holding a lock around the actual
3673          * call to the base driver.
3674          */
3675
3676         bond_for_each_slave(bond, slave, i) {
3677                 dprintk("s %p s->p %p c_m %p\n", slave,
3678                         slave->prev, slave->dev->change_mtu);
3679
3680                 res = dev_set_mtu(slave->dev, new_mtu);
3681
3682                 if (res) {
3683                         /* If we failed to set the slave's mtu to the new value
3684                          * we must abort the operation even in ACTIVE_BACKUP
3685                          * mode, because if we allow the backup slaves to have
3686                          * different mtu values than the active slave we'll
3687                          * need to change their mtu when doing a failover. That
3688                          * means changing their mtu from timer context, which
3689                          * is probably not a good idea.
3690                          */
3691                         dprintk("err %d %s\n", res, slave->dev->name);
3692                         goto unwind;
3693                 }
3694         }
3695
3696         bond_dev->mtu = new_mtu;
3697
3698         return 0;
3699
3700 unwind:
3701         /* unwind from head to the slave that failed */
3702         stop_at = slave;
3703         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3704                 int tmp_res;
3705
3706                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3707                 if (tmp_res) {
3708                         dprintk("unwind err %d dev %s\n", tmp_res,
3709                                 slave->dev->name);
3710                 }
3711         }
3712
3713         return res;
3714 }
3715
3716 /*
3717  * Change HW address
3718  *
3719  * Note that many devices must be down to change the HW address, and
3720  * downing the master releases all slaves.  We can make bonds full of
3721  * bonding devices to test this, however.
3722  */
3723 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3724 {
3725         struct bonding *bond = bond_dev->priv;
3726         struct sockaddr *sa = addr, tmp_sa;
3727         struct slave *slave, *stop_at;
3728         int res = 0;
3729         int i;
3730
3731         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3732
3733         if (!is_valid_ether_addr(sa->sa_data)) {
3734                 return -EADDRNOTAVAIL;
3735         }
3736
3737         /* Can't hold bond->lock with bh disabled here since
3738          * some base drivers panic. On the other hand we can't
3739          * hold bond->lock without bh disabled because we'll
3740          * deadlock. The only solution is to rely on the fact
3741          * that we're under rtnl_lock here, and the slaves
3742          * list won't change. This doesn't solve the problem
3743          * of setting the slave's hw address while it is
3744          * transmitting, but the assumption is that the base
3745          * driver can handle that.
3746          *
3747          * TODO: figure out a way to safely iterate the slaves
3748          * list, but without holding a lock around the actual
3749          * call to the base driver.
3750          */
3751
3752         bond_for_each_slave(bond, slave, i) {
3753                 dprintk("slave %p %s\n", slave, slave->dev->name);
3754
3755                 if (slave->dev->set_mac_address == NULL) {
3756                         res = -EOPNOTSUPP;
3757                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3758                         goto unwind;
3759                 }
3760
3761                 res = dev_set_mac_address(slave->dev, addr);
3762                 if (res) {
3763                         /* TODO: consider downing the slave
3764                          * and retry ?
3765                          * User should expect communications
3766                          * breakage anyway until ARP finish
3767                          * updating, so...
3768                          */
3769                         dprintk("err %d %s\n", res, slave->dev->name);
3770                         goto unwind;
3771                 }
3772         }
3773
3774         /* success */
3775         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3776         return 0;
3777
3778 unwind:
3779         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3780         tmp_sa.sa_family = bond_dev->type;
3781
3782         /* unwind from head to the slave that failed */
3783         stop_at = slave;
3784         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3785                 int tmp_res;
3786
3787                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3788                 if (tmp_res) {
3789                         dprintk("unwind err %d dev %s\n", tmp_res,
3790                                 slave->dev->name);
3791                 }
3792         }
3793
3794         return res;
3795 }
3796
3797 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3798 {
3799         struct bonding *bond = bond_dev->priv;
3800         struct slave *slave, *start_at;
3801         int i;
3802         int res = 1;
3803
3804         read_lock(&bond->lock);
3805
3806         if (!BOND_IS_OK(bond)) {
3807                 goto out;
3808         }
3809
3810         read_lock(&bond->curr_slave_lock);
3811         slave = start_at = bond->curr_active_slave;
3812         read_unlock(&bond->curr_slave_lock);
3813
3814         if (!slave) {
3815                 goto out;
3816         }
3817
3818         bond_for_each_slave_from(bond, slave, i, start_at) {
3819                 if (IS_UP(slave->dev) &&
3820                     (slave->link == BOND_LINK_UP) &&
3821                     (slave->state == BOND_STATE_ACTIVE)) {
3822                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3823
3824                         write_lock(&bond->curr_slave_lock);
3825                         bond->curr_active_slave = slave->next;
3826                         write_unlock(&bond->curr_slave_lock);
3827
3828                         break;
3829                 }
3830         }
3831
3832
3833 out:
3834         if (res) {
3835                 /* no suitable interface, frame not sent */
3836                 dev_kfree_skb(skb);
3837         }
3838         read_unlock(&bond->lock);
3839         return 0;
3840 }
3841
3842 static void bond_activebackup_xmit_copy(struct sk_buff *skb,
3843                                         struct bonding *bond,
3844                                         struct slave *slave)
3845 {
3846         struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
3847         struct ethhdr *eth_data;
3848         u8 *hwaddr;
3849         int res;
3850
3851         if (!skb2) {
3852                 printk(KERN_ERR DRV_NAME ": Error: "
3853                        "bond_activebackup_xmit_copy(): skb_copy() failed\n");
3854                 return;
3855         }
3856
3857         skb2->mac.raw = (unsigned char *)skb2->data;
3858         eth_data = eth_hdr(skb2);
3859
3860         /* Pick an appropriate source MAC address
3861          *      -- use slave's perm MAC addr, unless used by bond
3862          *      -- otherwise, borrow active slave's perm MAC addr
3863          *         since that will not be used
3864          */
3865         hwaddr = slave->perm_hwaddr;
3866         if (!memcmp(eth_data->h_source, hwaddr, ETH_ALEN))
3867                 hwaddr = bond->curr_active_slave->perm_hwaddr;
3868
3869         /* Set source MAC address appropriately */
3870         memcpy(eth_data->h_source, hwaddr, ETH_ALEN);
3871
3872         res = bond_dev_queue_xmit(bond, skb2, slave->dev);
3873         if (res)
3874                 dev_kfree_skb(skb2);
3875
3876         return;
3877 }
3878
3879 /*
3880  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3881  * the bond has a usable interface.
3882  */
3883 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3884 {
3885         struct bonding *bond = bond_dev->priv;
3886         int res = 1;
3887
3888         read_lock(&bond->lock);
3889         read_lock(&bond->curr_slave_lock);
3890
3891         if (!BOND_IS_OK(bond)) {
3892                 goto out;
3893         }
3894
3895         if (!bond->curr_active_slave)
3896                 goto out;
3897
3898         /* Xmit IGMP frames on all slaves to ensure rapid fail-over
3899            for multicast traffic on snooping switches */
3900         if (skb->protocol == __constant_htons(ETH_P_IP) &&
3901             skb->nh.iph->protocol == IPPROTO_IGMP) {
3902                 struct slave *slave, *active_slave;
3903                 int i;
3904
3905                 active_slave = bond->curr_active_slave;
3906                 bond_for_each_slave_from_to(bond, slave, i, active_slave->next,
3907                                             active_slave->prev)
3908                         if (IS_UP(slave->dev) &&
3909                             (slave->link == BOND_LINK_UP))
3910                                 bond_activebackup_xmit_copy(skb, bond, slave);
3911         }
3912
3913         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
3914
3915 out:
3916         if (res) {
3917                 /* no suitable interface, frame not sent */
3918                 dev_kfree_skb(skb);
3919         }
3920         read_unlock(&bond->curr_slave_lock);
3921         read_unlock(&bond->lock);
3922         return 0;
3923 }
3924
3925 /*
3926  * In bond_xmit_xor() , we determine the output device by using a pre-
3927  * determined xmit_hash_policy(), If the selected device is not enabled,
3928  * find the next active slave.
3929  */
3930 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3931 {
3932         struct bonding *bond = bond_dev->priv;
3933         struct slave *slave, *start_at;
3934         int slave_no;
3935         int i;
3936         int res = 1;
3937
3938         read_lock(&bond->lock);
3939
3940         if (!BOND_IS_OK(bond)) {
3941                 goto out;
3942         }
3943
3944         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
3945
3946         bond_for_each_slave(bond, slave, i) {
3947                 slave_no--;
3948                 if (slave_no < 0) {
3949                         break;
3950                 }
3951         }
3952
3953         start_at = slave;
3954
3955         bond_for_each_slave_from(bond, slave, i, start_at) {
3956                 if (IS_UP(slave->dev) &&
3957                     (slave->link == BOND_LINK_UP) &&
3958                     (slave->state == BOND_STATE_ACTIVE)) {
3959                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3960                         break;
3961                 }
3962         }
3963
3964 out:
3965         if (res) {
3966                 /* no suitable interface, frame not sent */
3967                 dev_kfree_skb(skb);
3968         }
3969         read_unlock(&bond->lock);
3970         return 0;
3971 }
3972
3973 /*
3974  * in broadcast mode, we send everything to all usable interfaces.
3975  */
3976 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3977 {
3978         struct bonding *bond = bond_dev->priv;
3979         struct slave *slave, *start_at;
3980         struct net_device *tx_dev = NULL;
3981         int i;
3982         int res = 1;
3983
3984         read_lock(&bond->lock);
3985
3986         if (!BOND_IS_OK(bond)) {
3987                 goto out;
3988         }
3989
3990         read_lock(&bond->curr_slave_lock);
3991         start_at = bond->curr_active_slave;
3992         read_unlock(&bond->curr_slave_lock);
3993
3994         if (!start_at) {
3995                 goto out;
3996         }
3997
3998         bond_for_each_slave_from(bond, slave, i, start_at) {
3999                 if (IS_UP(slave->dev) &&
4000                     (slave->link == BOND_LINK_UP) &&
4001                     (slave->state == BOND_STATE_ACTIVE)) {
4002                         if (tx_dev) {
4003                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4004                                 if (!skb2) {
4005                                         printk(KERN_ERR DRV_NAME
4006                                                ": %s: Error: bond_xmit_broadcast(): "
4007                                                "skb_clone() failed\n",
4008                                                bond_dev->name);
4009                                         continue;
4010                                 }
4011
4012                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4013                                 if (res) {
4014                                         dev_kfree_skb(skb2);
4015                                         continue;
4016                                 }
4017                         }
4018                         tx_dev = slave->dev;
4019                 }
4020         }
4021
4022         if (tx_dev) {
4023                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4024         }
4025
4026 out:
4027         if (res) {
4028                 /* no suitable interface, frame not sent */
4029                 dev_kfree_skb(skb);
4030         }
4031         /* frame sent to all suitable interfaces */
4032         read_unlock(&bond->lock);
4033         return 0;
4034 }
4035
4036 /*------------------------- Device initialization ---------------------------*/
4037
4038 /*
4039  * set bond mode specific net device operations
4040  */
4041 void bond_set_mode_ops(struct bonding *bond, int mode)
4042 {
4043         struct net_device *bond_dev = bond->dev;
4044
4045         switch (mode) {
4046         case BOND_MODE_ROUNDROBIN:
4047                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4048                 break;
4049         case BOND_MODE_ACTIVEBACKUP:
4050                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4051                 break;
4052         case BOND_MODE_XOR:
4053                 bond_dev->hard_start_xmit = bond_xmit_xor;
4054                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4055                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4056                 else
4057                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4058                 break;
4059         case BOND_MODE_BROADCAST:
4060                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4061                 break;
4062         case BOND_MODE_8023AD:
4063                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4064                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4065                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4066                 else
4067                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4068                 break;
4069         case BOND_MODE_TLB:
4070         case BOND_MODE_ALB:
4071                 bond_dev->hard_start_xmit = bond_alb_xmit;
4072                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4073                 break;
4074         default:
4075                 /* Should never happen, mode already checked */
4076                 printk(KERN_ERR DRV_NAME
4077                        ": %s: Error: Unknown bonding mode %d\n",
4078                        bond_dev->name,
4079                        mode);
4080                 break;
4081         }
4082 }
4083
4084 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4085                                     struct ethtool_drvinfo *drvinfo)
4086 {
4087         strncpy(drvinfo->driver, DRV_NAME, 32);
4088         strncpy(drvinfo->version, DRV_VERSION, 32);
4089         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4090 }
4091
4092 static struct ethtool_ops bond_ethtool_ops = {
4093         .get_tx_csum            = ethtool_op_get_tx_csum,
4094         .get_tso                = ethtool_op_get_tso,
4095         .get_ufo                = ethtool_op_get_ufo,
4096         .get_sg                 = ethtool_op_get_sg,
4097         .get_drvinfo            = bond_ethtool_get_drvinfo,
4098 };
4099
4100 /*
4101  * Does not allocate but creates a /proc entry.
4102  * Allowed to fail.
4103  */
4104 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4105 {
4106         struct bonding *bond = bond_dev->priv;
4107
4108         dprintk("Begin bond_init for %s\n", bond_dev->name);
4109
4110         /* initialize rwlocks */
4111         rwlock_init(&bond->lock);
4112         rwlock_init(&bond->curr_slave_lock);
4113
4114         bond->params = *params; /* copy params struct */
4115
4116         /* Initialize pointers */
4117         bond->first_slave = NULL;
4118         bond->curr_active_slave = NULL;
4119         bond->current_arp_slave = NULL;
4120         bond->primary_slave = NULL;
4121         bond->dev = bond_dev;
4122         INIT_LIST_HEAD(&bond->vlan_list);
4123
4124         /* Initialize the device entry points */
4125         bond_dev->open = bond_open;
4126         bond_dev->stop = bond_close;
4127         bond_dev->get_stats = bond_get_stats;
4128         bond_dev->do_ioctl = bond_do_ioctl;
4129         bond_dev->ethtool_ops = &bond_ethtool_ops;
4130         bond_dev->set_multicast_list = bond_set_multicast_list;
4131         bond_dev->change_mtu = bond_change_mtu;
4132         bond_dev->set_mac_address = bond_set_mac_address;
4133
4134         bond_set_mode_ops(bond, bond->params.mode);
4135
4136         bond_dev->destructor = free_netdev;
4137
4138         /* Initialize the device options */
4139         bond_dev->tx_queue_len = 0;
4140         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4141
4142         /* At first, we block adding VLANs. That's the only way to
4143          * prevent problems that occur when adding VLANs over an
4144          * empty bond. The block will be removed once non-challenged
4145          * slaves are enslaved.
4146          */
4147         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4148
4149         /* don't acquire bond device's xmit_lock when
4150          * transmitting */
4151         bond_dev->features |= NETIF_F_LLTX;
4152
4153         /* By default, we declare the bond to be fully
4154          * VLAN hardware accelerated capable. Special
4155          * care is taken in the various xmit functions
4156          * when there are slaves that are not hw accel
4157          * capable
4158          */
4159         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4160         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4161         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4162         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4163                                NETIF_F_HW_VLAN_RX |
4164                                NETIF_F_HW_VLAN_FILTER);
4165
4166 #ifdef CONFIG_PROC_FS
4167         bond_create_proc_entry(bond);
4168 #endif
4169
4170         list_add_tail(&bond->bond_list, &bond_dev_list);
4171
4172         return 0;
4173 }
4174
4175 /* De-initialize device specific data.
4176  * Caller must hold rtnl_lock.
4177  */
4178 void bond_deinit(struct net_device *bond_dev)
4179 {
4180         struct bonding *bond = bond_dev->priv;
4181
4182         list_del(&bond->bond_list);
4183
4184 #ifdef CONFIG_PROC_FS
4185         bond_remove_proc_entry(bond);
4186 #endif
4187 }
4188
4189 /* Unregister and free all bond devices.
4190  * Caller must hold rtnl_lock.
4191  */
4192 static void bond_free_all(void)
4193 {
4194         struct bonding *bond, *nxt;
4195
4196         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4197                 struct net_device *bond_dev = bond->dev;
4198
4199                 unregister_netdevice(bond_dev);
4200                 bond_deinit(bond_dev);
4201         }
4202
4203 #ifdef CONFIG_PROC_FS
4204         bond_destroy_proc_dir();
4205 #endif
4206 }
4207
4208 /*------------------------- Module initialization ---------------------------*/
4209
4210 /*
4211  * Convert string input module parms.  Accept either the
4212  * number of the mode or its string name.
4213  */
4214 int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
4215 {
4216         int i;
4217
4218         for (i = 0; tbl[i].modename; i++) {
4219                 if ((isdigit(*mode_arg) &&
4220                      tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4221                     (strncmp(mode_arg, tbl[i].modename,
4222                              strlen(tbl[i].modename)) == 0)) {
4223                         return tbl[i].mode;
4224                 }
4225         }
4226
4227         return -1;
4228 }
4229
4230 static int bond_check_params(struct bond_params *params)
4231 {
4232         /*
4233          * Convert string parameters.
4234          */
4235         if (mode) {
4236                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4237                 if (bond_mode == -1) {
4238                         printk(KERN_ERR DRV_NAME
4239                                ": Error: Invalid bonding mode \"%s\"\n",
4240                                mode == NULL ? "NULL" : mode);
4241                         return -EINVAL;
4242                 }
4243         }
4244
4245         if (xmit_hash_policy) {
4246                 if ((bond_mode != BOND_MODE_XOR) &&
4247                     (bond_mode != BOND_MODE_8023AD)) {
4248                         printk(KERN_INFO DRV_NAME
4249                                ": xor_mode param is irrelevant in mode %s\n",
4250                                bond_mode_name(bond_mode));
4251                 } else {
4252                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4253                                                         xmit_hashtype_tbl);
4254                         if (xmit_hashtype == -1) {
4255                                 printk(KERN_ERR DRV_NAME
4256                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4257                                 xmit_hash_policy == NULL ? "NULL" :
4258                                        xmit_hash_policy);
4259                                 return -EINVAL;
4260                         }
4261                 }
4262         }
4263
4264         if (lacp_rate) {
4265                 if (bond_mode != BOND_MODE_8023AD) {
4266                         printk(KERN_INFO DRV_NAME
4267                                ": lacp_rate param is irrelevant in mode %s\n",
4268                                bond_mode_name(bond_mode));
4269                 } else {
4270                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4271                         if (lacp_fast == -1) {
4272                                 printk(KERN_ERR DRV_NAME
4273                                        ": Error: Invalid lacp rate \"%s\"\n",
4274                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4275                                 return -EINVAL;
4276                         }
4277                 }
4278         }
4279
4280         if (max_bonds < 1 || max_bonds > INT_MAX) {
4281                 printk(KERN_WARNING DRV_NAME
4282                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4283                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4284                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4285                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4286         }
4287
4288         if (miimon < 0) {
4289                 printk(KERN_WARNING DRV_NAME
4290                        ": Warning: miimon module parameter (%d), "
4291                        "not in range 0-%d, so it was reset to %d\n",
4292                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4293                 miimon = BOND_LINK_MON_INTERV;
4294         }
4295
4296         if (updelay < 0) {
4297                 printk(KERN_WARNING DRV_NAME
4298                        ": Warning: updelay module parameter (%d), "
4299                        "not in range 0-%d, so it was reset to 0\n",
4300                        updelay, INT_MAX);
4301                 updelay = 0;
4302         }
4303
4304         if (downdelay < 0) {
4305                 printk(KERN_WARNING DRV_NAME
4306                        ": Warning: downdelay module parameter (%d), "
4307                        "not in range 0-%d, so it was reset to 0\n",
4308                        downdelay, INT_MAX);
4309                 downdelay = 0;
4310         }
4311
4312         if ((use_carrier != 0) && (use_carrier != 1)) {
4313                 printk(KERN_WARNING DRV_NAME
4314                        ": Warning: use_carrier module parameter (%d), "
4315                        "not of valid value (0/1), so it was set to 1\n",
4316                        use_carrier);
4317                 use_carrier = 1;
4318         }
4319
4320         /* reset values for 802.3ad */
4321         if (bond_mode == BOND_MODE_8023AD) {
4322                 if (!miimon) {
4323                         printk(KERN_WARNING DRV_NAME
4324                                ": Warning: miimon must be specified, "
4325                                "otherwise bonding will not detect link "
4326                                "failure, speed and duplex which are "
4327                                "essential for 802.3ad operation\n");
4328                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4329                         miimon = 100;
4330                 }
4331         }
4332
4333         /* reset values for TLB/ALB */
4334         if ((bond_mode == BOND_MODE_TLB) ||
4335             (bond_mode == BOND_MODE_ALB)) {
4336                 if (!miimon) {
4337                         printk(KERN_WARNING DRV_NAME
4338                                ": Warning: miimon must be specified, "
4339                                "otherwise bonding will not detect link "
4340                                "failure and link speed which are essential "
4341                                "for TLB/ALB load balancing\n");
4342                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4343                         miimon = 100;
4344                 }
4345         }
4346
4347         if (bond_mode == BOND_MODE_ALB) {
4348                 printk(KERN_NOTICE DRV_NAME
4349                        ": In ALB mode you might experience client "
4350                        "disconnections upon reconnection of a link if the "
4351                        "bonding module updelay parameter (%d msec) is "
4352                        "incompatible with the forwarding delay time of the "
4353                        "switch\n",
4354                        updelay);
4355         }
4356
4357         if (!miimon) {
4358                 if (updelay || downdelay) {
4359                         /* just warn the user the up/down delay will have
4360                          * no effect since miimon is zero...
4361                          */
4362                         printk(KERN_WARNING DRV_NAME
4363                                ": Warning: miimon module parameter not set "
4364                                "and updelay (%d) or downdelay (%d) module "
4365                                "parameter is set; updelay and downdelay have "
4366                                "no effect unless miimon is set\n",
4367                                updelay, downdelay);
4368                 }
4369         } else {
4370                 /* don't allow arp monitoring */
4371                 if (arp_interval) {
4372                         printk(KERN_WARNING DRV_NAME
4373                                ": Warning: miimon (%d) and arp_interval (%d) "
4374                                "can't be used simultaneously, disabling ARP "
4375                                "monitoring\n",
4376                                miimon, arp_interval);
4377                         arp_interval = 0;
4378                 }
4379
4380                 if ((updelay % miimon) != 0) {
4381                         printk(KERN_WARNING DRV_NAME
4382                                ": Warning: updelay (%d) is not a multiple "
4383                                "of miimon (%d), updelay rounded to %d ms\n",
4384                                updelay, miimon, (updelay / miimon) * miimon);
4385                 }
4386
4387                 updelay /= miimon;
4388
4389                 if ((downdelay % miimon) != 0) {
4390                         printk(KERN_WARNING DRV_NAME
4391                                ": Warning: downdelay (%d) is not a multiple "
4392                                "of miimon (%d), downdelay rounded to %d ms\n",
4393                                downdelay, miimon,
4394                                (downdelay / miimon) * miimon);
4395                 }
4396
4397                 downdelay /= miimon;
4398         }
4399
4400         if (arp_interval < 0) {
4401                 printk(KERN_WARNING DRV_NAME
4402                        ": Warning: arp_interval module parameter (%d) "
4403                        ", not in range 0-%d, so it was reset to %d\n",
4404                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4405                 arp_interval = BOND_LINK_ARP_INTERV;
4406         }
4407
4408         for (arp_ip_count = 0;
4409              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4410              arp_ip_count++) {
4411                 /* not complete check, but should be good enough to
4412                    catch mistakes */
4413                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4414                         printk(KERN_WARNING DRV_NAME
4415                                ": Warning: bad arp_ip_target module parameter "
4416                                "(%s), ARP monitoring will not be performed\n",
4417                                arp_ip_target[arp_ip_count]);
4418                         arp_interval = 0;
4419                 } else {
4420                         u32 ip = in_aton(arp_ip_target[arp_ip_count]);
4421                         arp_target[arp_ip_count] = ip;
4422                 }
4423         }
4424
4425         if (arp_interval && !arp_ip_count) {
4426                 /* don't allow arping if no arp_ip_target given... */
4427                 printk(KERN_WARNING DRV_NAME
4428                        ": Warning: arp_interval module parameter (%d) "
4429                        "specified without providing an arp_ip_target "
4430                        "parameter, arp_interval was reset to 0\n",
4431                        arp_interval);
4432                 arp_interval = 0;
4433         }
4434
4435         if (miimon) {
4436                 printk(KERN_INFO DRV_NAME
4437                        ": MII link monitoring set to %d ms\n",
4438                        miimon);
4439         } else if (arp_interval) {
4440                 int i;
4441
4442                 printk(KERN_INFO DRV_NAME
4443                        ": ARP monitoring set to %d ms with %d target(s):",
4444                        arp_interval, arp_ip_count);
4445
4446                 for (i = 0; i < arp_ip_count; i++)
4447                         printk (" %s", arp_ip_target[i]);
4448
4449                 printk("\n");
4450
4451         } else {
4452                 /* miimon and arp_interval not set, we need one so things
4453                  * work as expected, see bonding.txt for details
4454                  */
4455                 printk(KERN_WARNING DRV_NAME
4456                        ": Warning: either miimon or arp_interval and "
4457                        "arp_ip_target module parameters must be specified, "
4458                        "otherwise bonding will not detect link failures! see "
4459                        "bonding.txt for details.\n");
4460         }
4461
4462         if (primary && !USES_PRIMARY(bond_mode)) {
4463                 /* currently, using a primary only makes sense
4464                  * in active backup, TLB or ALB modes
4465                  */
4466                 printk(KERN_WARNING DRV_NAME
4467                        ": Warning: %s primary device specified but has no "
4468                        "effect in %s mode\n",
4469                        primary, bond_mode_name(bond_mode));
4470                 primary = NULL;
4471         }
4472
4473         /* fill params struct with the proper values */
4474         params->mode = bond_mode;
4475         params->xmit_policy = xmit_hashtype;
4476         params->miimon = miimon;
4477         params->arp_interval = arp_interval;
4478         params->updelay = updelay;
4479         params->downdelay = downdelay;
4480         params->use_carrier = use_carrier;
4481         params->lacp_fast = lacp_fast;
4482         params->primary[0] = 0;
4483
4484         if (primary) {
4485                 strncpy(params->primary, primary, IFNAMSIZ);
4486                 params->primary[IFNAMSIZ - 1] = 0;
4487         }
4488
4489         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4490
4491         return 0;
4492 }
4493
4494 /* Create a new bond based on the specified name and bonding parameters.
4495  * Caller must NOT hold rtnl_lock; we need to release it here before we
4496  * set up our sysfs entries.
4497  */
4498 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4499 {
4500         struct net_device *bond_dev;
4501         int res;
4502
4503         rtnl_lock();
4504         bond_dev = alloc_netdev(sizeof(struct bonding), name, ether_setup);
4505         if (!bond_dev) {
4506                 printk(KERN_ERR DRV_NAME
4507                        ": %s: eek! can't alloc netdev!\n",
4508                        name);
4509                 res = -ENOMEM;
4510                 goto out_rtnl;
4511         }
4512
4513         /* bond_init() must be called after dev_alloc_name() (for the
4514          * /proc files), but before register_netdevice(), because we
4515          * need to set function pointers.
4516          */
4517
4518         res = bond_init(bond_dev, params);
4519         if (res < 0) {
4520                 goto out_netdev;
4521         }
4522
4523         SET_MODULE_OWNER(bond_dev);
4524
4525         res = register_netdevice(bond_dev);
4526         if (res < 0) {
4527                 goto out_bond;
4528         }
4529         if (newbond)
4530                 *newbond = bond_dev->priv;
4531
4532         rtnl_unlock(); /* allows sysfs registration of net device */
4533         res = bond_create_sysfs_entry(bond_dev->priv);
4534         goto done;
4535 out_bond:
4536         bond_deinit(bond_dev);
4537 out_netdev:
4538         free_netdev(bond_dev);
4539 out_rtnl:
4540         rtnl_unlock();
4541 done:
4542         return res;
4543 }
4544
4545 static int __init bonding_init(void)
4546 {
4547         int i;
4548         int res;
4549         char new_bond_name[8];  /* Enough room for 999 bonds at init. */
4550
4551         printk(KERN_INFO "%s", version);
4552
4553         res = bond_check_params(&bonding_defaults);
4554         if (res) {
4555                 goto out;
4556         }
4557
4558 #ifdef CONFIG_PROC_FS
4559         bond_create_proc_dir();
4560 #endif
4561         for (i = 0; i < max_bonds; i++) {
4562                 sprintf(new_bond_name, "bond%d",i);
4563                 res = bond_create(new_bond_name,&bonding_defaults, NULL);
4564                 if (res)
4565                         goto err;
4566         }
4567
4568         res = bond_create_sysfs();
4569         if (res)
4570                 goto err;
4571
4572         register_netdevice_notifier(&bond_netdev_notifier);
4573         register_inetaddr_notifier(&bond_inetaddr_notifier);
4574
4575         goto out;
4576 err:
4577         rtnl_lock();
4578         bond_free_all();
4579         bond_destroy_sysfs();
4580         rtnl_unlock();
4581 out:
4582         return res;
4583
4584 }
4585
4586 static void __exit bonding_exit(void)
4587 {
4588         unregister_netdevice_notifier(&bond_netdev_notifier);
4589         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4590
4591         rtnl_lock();
4592         bond_free_all();
4593         bond_destroy_sysfs();
4594         rtnl_unlock();
4595 }
4596
4597 module_init(bonding_init);
4598 module_exit(bonding_exit);
4599 MODULE_LICENSE("GPL");
4600 MODULE_VERSION(DRV_VERSION);
4601 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4602 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4603 MODULE_SUPPORTED_DEVICE("most ethernet devices");
4604
4605 /*
4606  * Local variables:
4607  *  c-indent-level: 8
4608  *  c-basic-offset: 8
4609  *  tab-width: 8
4610  * End:
4611  */
4612