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