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/sched.h>
  39 #include <linux/types.h>
  40 #include <linux/fcntl.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/ptrace.h>
  43 #include <linux/ioport.h>
  44 #include <linux/in.h>
  45 #include <net/ip.h>
  46 #include <linux/ip.h>
  47 #include <linux/tcp.h>
  48 #include <linux/udp.h>
  49 #include <linux/slab.h>
  50 #include <linux/string.h>
  51 #include <linux/init.h>
  52 #include <linux/timer.h>
  53 #include <linux/socket.h>
  54 #include <linux/ctype.h>
  55 #include <linux/inet.h>
  56 #include <linux/bitops.h>
  57 #include <asm/system.h>
  58 #include <asm/io.h>
  59 #include <asm/dma.h>
  60 #include <asm/uaccess.h>
  61 #include <linux/errno.h>
  62 #include <linux/netdevice.h>
  63 #include <linux/inetdevice.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 "bonding.h"
  79 #include "bond_3ad.h"
  80 #include "bond_alb.h"
  81
  82 /*---------------------------- Module parameters ----------------------------*/
  83
  84 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  85 #define BOND_LINK_MON_INTERV    0
  86 #define BOND_LINK_ARP_INTERV    0
  87
  88 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  89 static int miimon       = BOND_LINK_MON_INTERV;
  90 static int updelay      = 0;
  91 static int downdelay    = 0;
  92 static int use_carrier  = 1;
  93 static char *mode       = NULL;
  94 static char *primary    = NULL;
  95 static char *lacp_rate  = NULL;
  96 static char *xmit_hash_policy = NULL;
  97 static int arp_interval = BOND_LINK_ARP_INTERV;
  98 static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
  99 static char *arp_validate = NULL;
 100 struct bond_params bonding_defaults;
 101
 102 module_param(max_bonds, int, 0);
 103 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 104 module_param(miimon, int, 0);
 105 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 106 module_param(updelay, int, 0);
 107 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 108 module_param(downdelay, int, 0);
 109 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 110                             "in milliseconds");
 111 module_param(use_carrier, int, 0);
 112 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 113                               "0 for off, 1 for on (default)");
 114 module_param(mode, charp, 0);
 115 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 116                        "1 for active-backup, 2 for balance-xor, "
 117                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 118                        "6 for balance-alb");
 119 module_param(primary, charp, 0);
 120 MODULE_PARM_DESC(primary, "Primary network device to use");
 121 module_param(lacp_rate, charp, 0);
 122 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 123                             "(slow/fast)");
 124 module_param(xmit_hash_policy, charp, 0);
 125 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 126                                    ", 1 for layer 3+4");
 127 module_param(arp_interval, int, 0);
 128 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 129 module_param_array(arp_ip_target, charp, NULL, 0);
 130 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 131 module_param(arp_validate, charp, 0);
 132 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 133
 134 /*----------------------------- Global variables ----------------------------*/
 135
 136 static const char * const version =
 137         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 138
 139 LIST_HEAD(bond_dev_list);
 140
 141 #ifdef CONFIG_PROC_FS
 142 static struct proc_dir_entry *bond_proc_dir = NULL;
 143 #endif
 144
 145 extern struct rw_semaphore bonding_rwsem;
 146 static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
 147 static int arp_ip_count = 0;
 148 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 149 static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
 150 static int lacp_fast    = 0;
 151
 152
 153 struct bond_parm_tbl bond_lacp_tbl[] = {
 154 {       "slow",         AD_LACP_SLOW},
 155 {       "fast",         AD_LACP_FAST},
 156 {       NULL,           -1},
 157 };
 158
 159 struct bond_parm_tbl bond_mode_tbl[] = {
 160 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 161 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 162 {       "balance-xor",          BOND_MODE_XOR},
 163 {       "broadcast",            BOND_MODE_BROADCAST},
 164 {       "802.3ad",              BOND_MODE_8023AD},
 165 {       "balance-tlb",          BOND_MODE_TLB},
 166 {       "balance-alb",          BOND_MODE_ALB},
 167 {       NULL,                   -1},
 168 };
 169
 170 struct bond_parm_tbl xmit_hashtype_tbl[] = {
 171 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 172 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 173 {       NULL,                   -1},
 174 };
 175
 176 struct bond_parm_tbl arp_validate_tbl[] = {
 177 {       "none",                 BOND_ARP_VALIDATE_NONE},
 178 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 179 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 180 {       "all",                  BOND_ARP_VALIDATE_ALL},
 181 {       NULL,                   -1},
 182 };
 183
 184 /*-------------------------- Forward declarations ---------------------------*/
 185
 186 static void bond_send_gratuitous_arp(struct bonding *bond);
 187
 188 /*---------------------------- General routines -----------------------------*/
 189
 190 const char *bond_mode_name(int mode)
 191 {
 192         switch (mode) {
 193         case BOND_MODE_ROUNDROBIN :
 194                 return "load balancing (round-robin)";
 195         case BOND_MODE_ACTIVEBACKUP :
 196                 return "fault-tolerance (active-backup)";
 197         case BOND_MODE_XOR :
 198                 return "load balancing (xor)";
 199         case BOND_MODE_BROADCAST :
 200                 return "fault-tolerance (broadcast)";
 201         case BOND_MODE_8023AD:
 202                 return "IEEE 802.3ad Dynamic link aggregation";
 203         case BOND_MODE_TLB:
 204                 return "transmit load balancing";
 205         case BOND_MODE_ALB:
 206                 return "adaptive load balancing";
 207         default:
 208                 return "unknown";
 209         }
 210 }
 211
 212 /*---------------------------------- VLAN -----------------------------------*/
 213
 214 /**
 215  * bond_add_vlan - add a new vlan id on bond
 216  * @bond: bond that got the notification
 217  * @vlan_id: the vlan id to add
 218  *
 219  * Returns -ENOMEM if allocation failed.
 220  */
 221 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 222 {
 223         struct vlan_entry *vlan;
 224
 225         dprintk("bond: %s, vlan id %d\n",
 226                 (bond ? bond->dev->name: "None"), vlan_id);
 227
 228         vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 229         if (!vlan) {
 230                 return -ENOMEM;
 231         }
 232
 233         INIT_LIST_HEAD(&vlan->vlan_list);
 234         vlan->vlan_id = vlan_id;
 235         vlan->vlan_ip = 0;
 236
 237         write_lock_bh(&bond->lock);
 238
 239         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 240
 241         write_unlock_bh(&bond->lock);
 242
 243         dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 244
 245         return 0;
 246 }
 247
 248 /**
 249  * bond_del_vlan - delete a vlan id from bond
 250  * @bond: bond that got the notification
 251  * @vlan_id: the vlan id to delete
 252  *
 253  * returns -ENODEV if @vlan_id was not found in @bond.
 254  */
 255 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 256 {
 257         struct vlan_entry *vlan, *next;
 258         int res = -ENODEV;
 259
 260         dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 261
 262         write_lock_bh(&bond->lock);
 263
 264         list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
 265                 if (vlan->vlan_id == vlan_id) {
 266                         list_del(&vlan->vlan_list);
 267
 268                         if ((bond->params.mode == BOND_MODE_TLB) ||
 269                             (bond->params.mode == BOND_MODE_ALB)) {
 270                                 bond_alb_clear_vlan(bond, vlan_id);
 271                         }
 272
 273                         dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
 274                                 bond->dev->name);
 275
 276                         kfree(vlan);
 277
 278                         if (list_empty(&bond->vlan_list) &&
 279                             (bond->slave_cnt == 0)) {
 280                                 /* Last VLAN removed and no slaves, so
 281                                  * restore block on adding VLANs. This will
 282                                  * be removed once new slaves that are not
 283                                  * VLAN challenged will be added.
 284                                  */
 285                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 286                         }
 287
 288                         res = 0;
 289                         goto out;
 290                 }
 291         }
 292
 293         dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
 294                 bond->dev->name);
 295
 296 out:
 297         write_unlock_bh(&bond->lock);
 298         return res;
 299 }
 300
 301 /**
 302  * bond_has_challenged_slaves
 303  * @bond: the bond we're working on
 304  *
 305  * Searches the slave list. Returns 1 if a vlan challenged slave
 306  * was found, 0 otherwise.
 307  *
 308  * Assumes bond->lock is held.
 309  */
 310 static int bond_has_challenged_slaves(struct bonding *bond)
 311 {
 312         struct slave *slave;
 313         int i;
 314
 315         bond_for_each_slave(bond, slave, i) {
 316                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 317                         dprintk("found VLAN challenged slave - %s\n",
 318                                 slave->dev->name);
 319                         return 1;
 320                 }
 321         }
 322
 323         dprintk("no VLAN challenged slaves found\n");
 324         return 0;
 325 }
 326
 327 /**
 328  * bond_next_vlan - safely skip to the next item in the vlans list.
 329  * @bond: the bond we're working on
 330  * @curr: item we're advancing from
 331  *
 332  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 333  * or @curr->next otherwise (even if it is @curr itself again).
 334  *
 335  * Caller must hold bond->lock
 336  */
 337 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 338 {
 339         struct vlan_entry *next, *last;
 340
 341         if (list_empty(&bond->vlan_list)) {
 342                 return NULL;
 343         }
 344
 345         if (!curr) {
 346                 next = list_entry(bond->vlan_list.next,
 347                                   struct vlan_entry, vlan_list);
 348         } else {
 349                 last = list_entry(bond->vlan_list.prev,
 350                                   struct vlan_entry, vlan_list);
 351                 if (last == curr) {
 352                         next = list_entry(bond->vlan_list.next,
 353                                           struct vlan_entry, vlan_list);
 354                 } else {
 355                         next = list_entry(curr->vlan_list.next,
 356                                           struct vlan_entry, vlan_list);
 357                 }
 358         }
 359
 360         return next;
 361 }
 362
 363 /**
 364  * bond_dev_queue_xmit - Prepare skb for xmit.
 365  *
 366  * @bond: bond device that got this skb for tx.
 367  * @skb: hw accel VLAN tagged skb to transmit
 368  * @slave_dev: slave that is supposed to xmit this skbuff
 369  *
 370  * When the bond gets an skb to transmit that is
 371  * already hardware accelerated VLAN tagged, and it
 372  * needs to relay this skb to a slave that is not
 373  * hw accel capable, the skb needs to be "unaccelerated",
 374  * i.e. strip the hwaccel tag and re-insert it as part
 375  * of the payload.
 376  */
 377 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
 378 {
 379         unsigned short vlan_id;
 380
 381         if (!list_empty(&bond->vlan_list) &&
 382             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 383             vlan_get_tag(skb, &vlan_id) == 0) {
 384                 skb->dev = slave_dev;
 385                 skb = vlan_put_tag(skb, vlan_id);
 386                 if (!skb) {
 387                         /* vlan_put_tag() frees the skb in case of error,
 388                          * so return success here so the calling functions
 389                          * won't attempt to free is again.
 390                          */
 391                         return 0;
 392                 }
 393         } else {
 394                 skb->dev = slave_dev;
 395         }
 396
 397         skb->priority = 1;
 398         dev_queue_xmit(skb);
 399
 400         return 0;
 401 }
 402
 403 /*
 404  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 405  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 406  * lock because:
 407  * a. This operation is performed in IOCTL context,
 408  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 409  * c. Holding a lock with BH disabled while directly calling a base driver
 410  *    entry point is generally a BAD idea.
 411  *
 412  * The design of synchronization/protection for this operation in the 8021q
 413  * module is good for one or more VLAN devices over a single physical device
 414  * and cannot be extended for a teaming solution like bonding, so there is a
 415  * potential race condition here where a net device from the vlan group might
 416  * be referenced (either by a base driver or the 8021q code) while it is being
 417  * removed from the system. However, it turns out we're not making matters
 418  * worse, and if it works for regular VLAN usage it will work here too.
 419 */
 420
 421 /**
 422  * bond_vlan_rx_register - Propagates registration to slaves
 423  * @bond_dev: bonding net device that got called
 424  * @grp: vlan group being registered
 425  */
 426 static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
 427 {
 428         struct bonding *bond = bond_dev->priv;
 429         struct slave *slave;
 430         int i;
 431
 432         bond->vlgrp = grp;
 433
 434         bond_for_each_slave(bond, slave, i) {
 435                 struct net_device *slave_dev = slave->dev;
 436
 437                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 438                     slave_dev->vlan_rx_register) {
 439                         slave_dev->vlan_rx_register(slave_dev, grp);
 440                 }
 441         }
 442 }
 443
 444 /**
 445  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 446  * @bond_dev: bonding net device that got called
 447  * @vid: vlan id being added
 448  */
 449 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 450 {
 451         struct bonding *bond = bond_dev->priv;
 452         struct slave *slave;
 453         int i, res;
 454
 455         bond_for_each_slave(bond, slave, i) {
 456                 struct net_device *slave_dev = slave->dev;
 457
 458                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 459                     slave_dev->vlan_rx_add_vid) {
 460                         slave_dev->vlan_rx_add_vid(slave_dev, vid);
 461                 }
 462         }
 463
 464         res = bond_add_vlan(bond, vid);
 465         if (res) {
 466                 printk(KERN_ERR DRV_NAME
 467                        ": %s: Error: Failed to add vlan id %d\n",
 468                        bond_dev->name, vid);
 469         }
 470 }
 471
 472 /**
 473  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 474  * @bond_dev: bonding net device that got called
 475  * @vid: vlan id being removed
 476  */
 477 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 478 {
 479         struct bonding *bond = bond_dev->priv;
 480         struct slave *slave;
 481         struct net_device *vlan_dev;
 482         int i, res;
 483
 484         bond_for_each_slave(bond, slave, i) {
 485                 struct net_device *slave_dev = slave->dev;
 486
 487                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 488                     slave_dev->vlan_rx_kill_vid) {
 489                         /* Save and then restore vlan_dev in the grp array,
 490                          * since the slave's driver might clear it.
 491                          */
 492                         vlan_dev = bond->vlgrp->vlan_devices[vid];
 493                         slave_dev->vlan_rx_kill_vid(slave_dev, vid);
 494                         bond->vlgrp->vlan_devices[vid] = vlan_dev;
 495                 }
 496         }
 497
 498         res = bond_del_vlan(bond, vid);
 499         if (res) {
 500                 printk(KERN_ERR DRV_NAME
 501                        ": %s: Error: Failed to remove vlan id %d\n",
 502                        bond_dev->name, vid);
 503         }
 504 }
 505
 506 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 507 {
 508         struct vlan_entry *vlan;
 509
 510         write_lock_bh(&bond->lock);
 511
 512         if (list_empty(&bond->vlan_list)) {
 513                 goto out;
 514         }
 515
 516         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 517             slave_dev->vlan_rx_register) {
 518                 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
 519         }
 520
 521         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 522             !(slave_dev->vlan_rx_add_vid)) {
 523                 goto out;
 524         }
 525
 526         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 527                 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 528         }
 529
 530 out:
 531         write_unlock_bh(&bond->lock);
 532 }
 533
 534 static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
 535 {
 536         struct vlan_entry *vlan;
 537         struct net_device *vlan_dev;
 538
 539         write_lock_bh(&bond->lock);
 540
 541         if (list_empty(&bond->vlan_list)) {
 542                 goto out;
 543         }
 544
 545         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 546             !(slave_dev->vlan_rx_kill_vid)) {
 547                 goto unreg;
 548         }
 549
 550         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 551                 /* Save and then restore vlan_dev in the grp array,
 552                  * since the slave's driver might clear it.
 553                  */
 554                 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
 555                 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 556                 bond->vlgrp->vlan_devices[vlan->vlan_id] = vlan_dev;
 557         }
 558
 559 unreg:
 560         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 561             slave_dev->vlan_rx_register) {
 562                 slave_dev->vlan_rx_register(slave_dev, NULL);
 563         }
 564
 565 out:
 566         write_unlock_bh(&bond->lock);
 567 }
 568
 569 /*------------------------------- Link status -------------------------------*/
 570
 571 /*
 572  * Set the carrier state for the master according to the state of its
 573  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 574  * do special 802.3ad magic.
 575  *
 576  * Returns zero if carrier state does not change, nonzero if it does.
 577  */
 578 static int bond_set_carrier(struct bonding *bond)
 579 {
 580         struct slave *slave;
 581         int i;
 582
 583         if (bond->slave_cnt == 0)
 584                 goto down;
 585
 586         if (bond->params.mode == BOND_MODE_8023AD)
 587                 return bond_3ad_set_carrier(bond);
 588
 589         bond_for_each_slave(bond, slave, i) {
 590                 if (slave->link == BOND_LINK_UP) {
 591                         if (!netif_carrier_ok(bond->dev)) {
 592                                 netif_carrier_on(bond->dev);
 593                                 return 1;
 594                         }
 595                         return 0;
 596                 }
 597         }
 598
 599 down:
 600         if (netif_carrier_ok(bond->dev)) {
 601                 netif_carrier_off(bond->dev);
 602                 return 1;
 603         }
 604         return 0;
 605 }
 606
 607 /*
 608  * Get link speed and duplex from the slave's base driver
 609  * using ethtool. If for some reason the call fails or the
 610  * values are invalid, fake speed and duplex to 100/Full
 611  * and return error.
 612  */
 613 static int bond_update_speed_duplex(struct slave *slave)
 614 {
 615         struct net_device *slave_dev = slave->dev;
 616         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 617         struct ifreq ifr;
 618         struct ethtool_cmd etool;
 619
 620         /* Fake speed and duplex */
 621         slave->speed = SPEED_100;
 622         slave->duplex = DUPLEX_FULL;
 623
 624         if (slave_dev->ethtool_ops) {
 625                 int res;
 626
 627                 if (!slave_dev->ethtool_ops->get_settings) {
 628                         return -1;
 629                 }
 630
 631                 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 632                 if (res < 0) {
 633                         return -1;
 634                 }
 635
 636                 goto verify;
 637         }
 638
 639         ioctl = slave_dev->do_ioctl;
 640         strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 641         etool.cmd = ETHTOOL_GSET;
 642         ifr.ifr_data = (char*)&etool;
 643         if (!ioctl || (IOCTL(slave_dev, &ifr, SIOCETHTOOL) < 0)) {
 644                 return -1;
 645         }
 646
 647 verify:
 648         switch (etool.speed) {
 649         case SPEED_10:
 650         case SPEED_100:
 651         case SPEED_1000:
 652         case SPEED_10000:
 653                 break;
 654         default:
 655                 return -1;
 656         }
 657
 658         switch (etool.duplex) {
 659         case DUPLEX_FULL:
 660         case DUPLEX_HALF:
 661                 break;
 662         default:
 663                 return -1;
 664         }
 665
 666         slave->speed = etool.speed;
 667         slave->duplex = etool.duplex;
 668
 669         return 0;
 670 }
 671
 672 /*
 673  * if <dev> supports MII link status reporting, check its link status.
 674  *
 675  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 676  * depening upon the setting of the use_carrier parameter.
 677  *
 678  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 679  * can't tell and just pretend it is), or 0, meaning that the link is
 680  * down.
 681  *
 682  * If reporting is non-zero, instead of faking link up, return -1 if
 683  * both ETHTOOL and MII ioctls fail (meaning the device does not
 684  * support them).  If use_carrier is set, return whatever it says.
 685  * It'd be nice if there was a good way to tell if a driver supports
 686  * netif_carrier, but there really isn't.
 687  */
 688 static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
 689 {
 690         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 691         struct ifreq ifr;
 692         struct mii_ioctl_data *mii;
 693         struct ethtool_value etool;
 694
 695         if (bond->params.use_carrier) {
 696                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 697         }
 698
 699         ioctl = slave_dev->do_ioctl;
 700         if (ioctl) {
 701                 /* TODO: set pointer to correct ioctl on a per team member */
 702                 /*       bases to make this more efficient. that is, once  */
 703                 /*       we determine the correct ioctl, we will always    */
 704                 /*       call it and not the others for that team          */
 705                 /*       member.                                           */
 706
 707                 /*
 708                  * We cannot assume that SIOCGMIIPHY will also read a
 709                  * register; not all network drivers (e.g., e100)
 710                  * support that.
 711                  */
 712
 713                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 714                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 715                 mii = if_mii(&ifr);
 716                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 717                         mii->reg_num = MII_BMSR;
 718                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
 719                                 return (mii->val_out & BMSR_LSTATUS);
 720                         }
 721                 }
 722         }
 723
 724         /* try SIOCETHTOOL ioctl, some drivers cache ETHTOOL_GLINK */
 725         /* for a period of time so we attempt to get link status   */
 726         /* from it last if the above MII ioctls fail...            */
 727         if (slave_dev->ethtool_ops) {
 728                 if (slave_dev->ethtool_ops->get_link) {
 729                         u32 link;
 730
 731                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 732
 733                         return link ? BMSR_LSTATUS : 0;
 734                 }
 735         }
 736
 737         if (ioctl) {
 738                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 739                 etool.cmd = ETHTOOL_GLINK;
 740                 ifr.ifr_data = (char*)&etool;
 741                 if (IOCTL(slave_dev, &ifr, SIOCETHTOOL) == 0) {
 742                         if (etool.data == 1) {
 743                                 return BMSR_LSTATUS;
 744                         } else {
 745                                 dprintk("SIOCETHTOOL shows link down\n");
 746                                 return 0;
 747                         }
 748                 }
 749         }
 750
 751         /*
 752          * If reporting, report that either there's no dev->do_ioctl,
 753          * or both SIOCGMIIREG and SIOCETHTOOL failed (meaning that we
 754          * cannot report link status).  If not reporting, pretend
 755          * we're ok.
 756          */
 757         return (reporting ? -1 : BMSR_LSTATUS);
 758 }
 759
 760 /*----------------------------- Multicast list ------------------------------*/
 761
 762 /*
 763  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
 764  */
 765 static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
 766 {
 767         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
 768                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
 769 }
 770
 771 /*
 772  * returns dmi entry if found, NULL otherwise
 773  */
 774 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
 775 {
 776         struct dev_mc_list *idmi;
 777
 778         for (idmi = mc_list; idmi; idmi = idmi->next) {
 779                 if (bond_is_dmi_same(dmi, idmi)) {
 780                         return idmi;
 781                 }
 782         }
 783
 784         return NULL;
 785 }
 786
 787 /*
 788  * Push the promiscuity flag down to appropriate slaves
 789  */
 790 static void bond_set_promiscuity(struct bonding *bond, int inc)
 791 {
 792         if (USES_PRIMARY(bond->params.mode)) {
 793                 /* write lock already acquired */
 794                 if (bond->curr_active_slave) {
 795                         dev_set_promiscuity(bond->curr_active_slave->dev, inc);
 796                 }
 797         } else {
 798                 struct slave *slave;
 799                 int i;
 800                 bond_for_each_slave(bond, slave, i) {
 801                         dev_set_promiscuity(slave->dev, inc);
 802                 }
 803         }
 804 }
 805
 806 /*
 807  * Push the allmulti flag down to all slaves
 808  */
 809 static void bond_set_allmulti(struct bonding *bond, int inc)
 810 {
 811         if (USES_PRIMARY(bond->params.mode)) {
 812                 /* write lock already acquired */
 813                 if (bond->curr_active_slave) {
 814                         dev_set_allmulti(bond->curr_active_slave->dev, inc);
 815                 }
 816         } else {
 817                 struct slave *slave;
 818                 int i;
 819                 bond_for_each_slave(bond, slave, i) {
 820                         dev_set_allmulti(slave->dev, inc);
 821                 }
 822         }
 823 }
 824
 825 /*
 826  * Add a Multicast address to slaves
 827  * according to mode
 828  */
 829 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
 830 {
 831         if (USES_PRIMARY(bond->params.mode)) {
 832                 /* write lock already acquired */
 833                 if (bond->curr_active_slave) {
 834                         dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
 835                 }
 836         } else {
 837                 struct slave *slave;
 838                 int i;
 839                 bond_for_each_slave(bond, slave, i) {
 840                         dev_mc_add(slave->dev, addr, alen, 0);
 841                 }
 842         }
 843 }
 844
 845 /*
 846  * Remove a multicast address from slave
 847  * according to mode
 848  */
 849 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
 850 {
 851         if (USES_PRIMARY(bond->params.mode)) {
 852                 /* write lock already acquired */
 853                 if (bond->curr_active_slave) {
 854                         dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
 855                 }
 856         } else {
 857                 struct slave *slave;
 858                 int i;
 859                 bond_for_each_slave(bond, slave, i) {
 860                         dev_mc_delete(slave->dev, addr, alen, 0);
 861                 }
 862         }
 863 }
 864
 865 /*
 866  * Totally destroys the mc_list in bond
 867  */
 868 static void bond_mc_list_destroy(struct bonding *bond)
 869 {
 870         struct dev_mc_list *dmi;
 871
 872         dmi = bond->mc_list;
 873         while (dmi) {
 874                 bond->mc_list = dmi->next;
 875                 kfree(dmi);
 876                 dmi = bond->mc_list;
 877         }
 878 }
 879
 880 /*
 881  * Copy all the Multicast addresses from src to the bonding device dst
 882  */
 883 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
 884                              gfp_t gfp_flag)
 885 {
 886         struct dev_mc_list *dmi, *new_dmi;
 887
 888         for (dmi = mc_list; dmi; dmi = dmi->next) {
 889                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
 890
 891                 if (!new_dmi) {
 892                         /* FIXME: Potential memory leak !!! */
 893                         return -ENOMEM;
 894                 }
 895
 896                 new_dmi->next = bond->mc_list;
 897                 bond->mc_list = new_dmi;
 898                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
 899                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
 900                 new_dmi->dmi_users = dmi->dmi_users;
 901                 new_dmi->dmi_gusers = dmi->dmi_gusers;
 902         }
 903
 904         return 0;
 905 }
 906
 907 /*
 908  * flush all members of flush->mc_list from device dev->mc_list
 909  */
 910 static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
 911 {
 912         struct bonding *bond = bond_dev->priv;
 913         struct dev_mc_list *dmi;
 914
 915         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
 916                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 917         }
 918
 919         if (bond->params.mode == BOND_MODE_8023AD) {
 920                 /* del lacpdu mc addr from mc list */
 921                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 922
 923                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
 924         }
 925 }
 926
 927 /*--------------------------- Active slave change ---------------------------*/
 928
 929 /*
 930  * Update the mc list and multicast-related flags for the new and
 931  * old active slaves (if any) according to the multicast mode, and
 932  * promiscuous flags unconditionally.
 933  */
 934 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
 935 {
 936         struct dev_mc_list *dmi;
 937
 938         if (!USES_PRIMARY(bond->params.mode)) {
 939                 /* nothing to do -  mc list is already up-to-date on
 940                  * all slaves
 941                  */
 942                 return;
 943         }
 944
 945         if (old_active) {
 946                 if (bond->dev->flags & IFF_PROMISC) {
 947                         dev_set_promiscuity(old_active->dev, -1);
 948                 }
 949
 950                 if (bond->dev->flags & IFF_ALLMULTI) {
 951                         dev_set_allmulti(old_active->dev, -1);
 952                 }
 953
 954                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 955                         dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 956                 }
 957         }
 958
 959         if (new_active) {
 960                 if (bond->dev->flags & IFF_PROMISC) {
 961                         dev_set_promiscuity(new_active->dev, 1);
 962                 }
 963
 964                 if (bond->dev->flags & IFF_ALLMULTI) {
 965                         dev_set_allmulti(new_active->dev, 1);
 966                 }
 967
 968                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 969                         dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 970                 }
 971         }
 972 }
 973
 974 /**
 975  * find_best_interface - select the best available slave to be the active one
 976  * @bond: our bonding struct
 977  *
 978  * Warning: Caller must hold curr_slave_lock for writing.
 979  */
 980 static struct slave *bond_find_best_slave(struct bonding *bond)
 981 {
 982         struct slave *new_active, *old_active;
 983         struct slave *bestslave = NULL;
 984         int mintime = bond->params.updelay;
 985         int i;
 986
 987         new_active = old_active = bond->curr_active_slave;
 988
 989         if (!new_active) { /* there were no active slaves left */
 990                 if (bond->slave_cnt > 0) {  /* found one slave */
 991                         new_active = bond->first_slave;
 992                 } else {
 993                         return NULL; /* still no slave, return NULL */
 994                 }
 995         }
 996
 997         /* first try the primary link; if arping, a link must tx/rx traffic
 998          * before it can be considered the curr_active_slave - also, we would skip
 999          * slaves between the curr_active_slave and primary_slave that may be up
1000          * and able to arp
1001          */
1002         if ((bond->primary_slave) &&
1003             (!bond->params.arp_interval) &&
1004             (IS_UP(bond->primary_slave->dev))) {
1005                 new_active = bond->primary_slave;
1006         }
1007
1008         /* remember where to stop iterating over the slaves */
1009         old_active = new_active;
1010
1011         bond_for_each_slave_from(bond, new_active, i, old_active) {
1012                 if (IS_UP(new_active->dev)) {
1013                         if (new_active->link == BOND_LINK_UP) {
1014                                 return new_active;
1015                         } else if (new_active->link == BOND_LINK_BACK) {
1016                                 /* link up, but waiting for stabilization */
1017                                 if (new_active->delay < mintime) {
1018                                         mintime = new_active->delay;
1019                                         bestslave = new_active;
1020                                 }
1021                         }
1022                 }
1023         }
1024
1025         return bestslave;
1026 }
1027
1028 /**
1029  * change_active_interface - change the active slave into the specified one
1030  * @bond: our bonding struct
1031  * @new: the new slave to make the active one
1032  *
1033  * Set the new slave to the bond's settings and unset them on the old
1034  * curr_active_slave.
1035  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1036  *
1037  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1038  * because it is apparently the best available slave we have, even though its
1039  * updelay hasn't timed out yet.
1040  *
1041  * Warning: Caller must hold curr_slave_lock for writing.
1042  */
1043 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1044 {
1045         struct slave *old_active = bond->curr_active_slave;
1046
1047         if (old_active == new_active) {
1048                 return;
1049         }
1050
1051         if (new_active) {
1052                 if (new_active->link == BOND_LINK_BACK) {
1053                         if (USES_PRIMARY(bond->params.mode)) {
1054                                 printk(KERN_INFO DRV_NAME
1055                                        ": %s: making interface %s the new "
1056                                        "active one %d ms earlier.\n",
1057                                        bond->dev->name, new_active->dev->name,
1058                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1059                         }
1060
1061                         new_active->delay = 0;
1062                         new_active->link = BOND_LINK_UP;
1063                         new_active->jiffies = jiffies;
1064
1065                         if (bond->params.mode == BOND_MODE_8023AD) {
1066                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1067                         }
1068
1069                         if ((bond->params.mode == BOND_MODE_TLB) ||
1070                             (bond->params.mode == BOND_MODE_ALB)) {
1071                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1072                         }
1073                 } else {
1074                         if (USES_PRIMARY(bond->params.mode)) {
1075                                 printk(KERN_INFO DRV_NAME
1076                                        ": %s: making interface %s the new "
1077                                        "active one.\n",
1078                                        bond->dev->name, new_active->dev->name);
1079                         }
1080                 }
1081         }
1082
1083         if (USES_PRIMARY(bond->params.mode)) {
1084                 bond_mc_swap(bond, new_active, old_active);
1085         }
1086
1087         if ((bond->params.mode == BOND_MODE_TLB) ||
1088             (bond->params.mode == BOND_MODE_ALB)) {
1089                 bond_alb_handle_active_change(bond, new_active);
1090                 if (old_active)
1091                         bond_set_slave_inactive_flags(old_active);
1092                 if (new_active)
1093                         bond_set_slave_active_flags(new_active);
1094         } else {
1095                 bond->curr_active_slave = new_active;
1096         }
1097
1098         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1099                 if (old_active) {
1100                         bond_set_slave_inactive_flags(old_active);
1101                 }
1102
1103                 if (new_active) {
1104                         bond_set_slave_active_flags(new_active);
1105                 }
1106                 bond_send_gratuitous_arp(bond);
1107         }
1108 }
1109
1110 /**
1111  * bond_select_active_slave - select a new active slave, if needed
1112  * @bond: our bonding struct
1113  *
1114  * This functions shoud be called when one of the following occurs:
1115  * - The old curr_active_slave has been released or lost its link.
1116  * - The primary_slave has got its link back.
1117  * - A slave has got its link back and there's no old curr_active_slave.
1118  *
1119  * Warning: Caller must hold curr_slave_lock for writing.
1120  */
1121 void bond_select_active_slave(struct bonding *bond)
1122 {
1123         struct slave *best_slave;
1124         int rv;
1125
1126         best_slave = bond_find_best_slave(bond);
1127         if (best_slave != bond->curr_active_slave) {
1128                 bond_change_active_slave(bond, best_slave);
1129                 rv = bond_set_carrier(bond);
1130                 if (!rv)
1131                         return;
1132
1133                 if (netif_carrier_ok(bond->dev)) {
1134                         printk(KERN_INFO DRV_NAME
1135                                ": %s: first active interface up!\n",
1136                                bond->dev->name);
1137                 } else {
1138                         printk(KERN_INFO DRV_NAME ": %s: "
1139                                "now running without any active interface !\n",
1140                                bond->dev->name);
1141                 }
1142         }
1143 }
1144
1145 /*--------------------------- slave list handling ---------------------------*/
1146
1147 /*
1148  * This function attaches the slave to the end of list.
1149  *
1150  * bond->lock held for writing by caller.
1151  */
1152 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1153 {
1154         if (bond->first_slave == NULL) { /* attaching the first slave */
1155                 new_slave->next = new_slave;
1156                 new_slave->prev = new_slave;
1157                 bond->first_slave = new_slave;
1158         } else {
1159                 new_slave->next = bond->first_slave;
1160                 new_slave->prev = bond->first_slave->prev;
1161                 new_slave->next->prev = new_slave;
1162                 new_slave->prev->next = new_slave;
1163         }
1164
1165         bond->slave_cnt++;
1166 }
1167
1168 /*
1169  * This function detaches the slave from the list.
1170  * WARNING: no check is made to verify if the slave effectively
1171  * belongs to <bond>.
1172  * Nothing is freed on return, structures are just unchained.
1173  * If any slave pointer in bond was pointing to <slave>,
1174  * it should be changed by the calling function.
1175  *
1176  * bond->lock held for writing by caller.
1177  */
1178 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1179 {
1180         if (slave->next) {
1181                 slave->next->prev = slave->prev;
1182         }
1183
1184         if (slave->prev) {
1185                 slave->prev->next = slave->next;
1186         }
1187
1188         if (bond->first_slave == slave) { /* slave is the first slave */
1189                 if (bond->slave_cnt > 1) { /* there are more slave */
1190                         bond->first_slave = slave->next;
1191                 } else {
1192                         bond->first_slave = NULL; /* slave was the last one */
1193                 }
1194         }
1195
1196         slave->next = NULL;
1197         slave->prev = NULL;
1198         bond->slave_cnt--;
1199 }
1200
1201 /*---------------------------------- IOCTL ----------------------------------*/
1202
1203 int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev)
1204 {
1205         dprintk("bond_dev=%p\n", bond_dev);
1206         dprintk("slave_dev=%p\n", slave_dev);
1207         dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1208         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1209         return 0;
1210 }
1211
1212 #define BOND_INTERSECT_FEATURES \
1213         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_TSO | NETIF_F_UFO)
1214
1215 /*
1216  * Compute the common dev->feature set available to all slaves.  Some
1217  * feature bits are managed elsewhere, so preserve feature bits set on
1218  * master device that are not part of the examined set.
1219  */
1220 static int bond_compute_features(struct bonding *bond)
1221 {
1222         unsigned long features = BOND_INTERSECT_FEATURES;
1223         struct slave *slave;
1224         struct net_device *bond_dev = bond->dev;
1225         unsigned short max_hard_header_len = ETH_HLEN;
1226         int i;
1227
1228         bond_for_each_slave(bond, slave, i) {
1229                 features &= (slave->dev->features & BOND_INTERSECT_FEATURES);
1230                 if (slave->dev->hard_header_len > max_hard_header_len)
1231                         max_hard_header_len = slave->dev->hard_header_len;
1232         }
1233
1234         if ((features & NETIF_F_SG) &&
1235             !(features & NETIF_F_ALL_CSUM))
1236                 features &= ~NETIF_F_SG;
1237
1238         /*
1239          * features will include NETIF_F_TSO (NETIF_F_UFO) iff all
1240          * slave devices support NETIF_F_TSO (NETIF_F_UFO), which
1241          * implies that all slaves also support scatter-gather
1242          * (NETIF_F_SG), which implies that features also includes
1243          * NETIF_F_SG. So no need to check whether we have an
1244          * illegal combination of NETIF_F_{TSO,UFO} and
1245          * !NETIF_F_SG
1246          */
1247
1248         features |= (bond_dev->features & ~BOND_INTERSECT_FEATURES);
1249         bond_dev->features = features;
1250         bond_dev->hard_header_len = max_hard_header_len;
1251
1252         return 0;
1253 }
1254
1255 /* enslave device <slave> to bond device <master> */
1256 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1257 {
1258         struct bonding *bond = bond_dev->priv;
1259         struct slave *new_slave = NULL;
1260         struct dev_mc_list *dmi;
1261         struct sockaddr addr;
1262         int link_reporting;
1263         int old_features = bond_dev->features;
1264         int res = 0;
1265
1266         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1267                 slave_dev->do_ioctl == NULL) {
1268                 printk(KERN_WARNING DRV_NAME
1269                        ": %s: Warning: no link monitoring support for %s\n",
1270                        bond_dev->name, slave_dev->name);
1271         }
1272
1273         /* bond must be initialized by bond_open() before enslaving */
1274         if (!(bond_dev->flags & IFF_UP)) {
1275                 dprintk("Error, master_dev is not up\n");
1276                 return -EPERM;
1277         }
1278
1279         /* already enslaved */
1280         if (slave_dev->flags & IFF_SLAVE) {
1281                 dprintk("Error, Device was already enslaved\n");
1282                 return -EBUSY;
1283         }
1284
1285         /* vlan challenged mutual exclusion */
1286         /* no need to lock since we're protected by rtnl_lock */
1287         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1288                 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1289                 if (!list_empty(&bond->vlan_list)) {
1290                         printk(KERN_ERR DRV_NAME
1291                                ": %s: Error: cannot enslave VLAN "
1292                                "challenged slave %s on VLAN enabled "
1293                                "bond %s\n", bond_dev->name, slave_dev->name,
1294                                bond_dev->name);
1295                         return -EPERM;
1296                 } else {
1297                         printk(KERN_WARNING DRV_NAME
1298                                ": %s: Warning: enslaved VLAN challenged "
1299                                "slave %s. Adding VLANs will be blocked as "
1300                                "long as %s is part of bond %s\n",
1301                                bond_dev->name, slave_dev->name, slave_dev->name,
1302                                bond_dev->name);
1303                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1304                 }
1305         } else {
1306                 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1307                 if (bond->slave_cnt == 0) {
1308                         /* First slave, and it is not VLAN challenged,
1309                          * so remove the block of adding VLANs over the bond.
1310                          */
1311                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1312                 }
1313         }
1314
1315         /*
1316          * Old ifenslave binaries are no longer supported.  These can
1317          * be identified with moderate accurary by the state of the slave:
1318          * the current ifenslave will set the interface down prior to
1319          * enslaving it; the old ifenslave will not.
1320          */
1321         if ((slave_dev->flags & IFF_UP)) {
1322                 printk(KERN_ERR DRV_NAME ": %s is up. "
1323                        "This may be due to an out of date ifenslave.\n",
1324                        slave_dev->name);
1325                 res = -EPERM;
1326                 goto err_undo_flags;
1327         }
1328
1329         if (slave_dev->set_mac_address == NULL) {
1330                 printk(KERN_ERR DRV_NAME
1331                         ": %s: Error: The slave device you specified does "
1332                         "not support setting the MAC address. "
1333                         "Your kernel likely does not support slave "
1334                         "devices.\n", bond_dev->name);
1335                 res = -EOPNOTSUPP;
1336                 goto err_undo_flags;
1337         }
1338
1339         if (slave_dev->get_stats == NULL) {
1340                 printk(KERN_NOTICE DRV_NAME
1341                         ": %s: the driver for slave device %s does not provide "
1342                         "get_stats function, network statistics will be "
1343                         "inaccurate.\n", bond_dev->name, slave_dev->name);
1344         }
1345
1346         new_slave = kmalloc(sizeof(struct slave), GFP_KERNEL);
1347         if (!new_slave) {
1348                 res = -ENOMEM;
1349                 goto err_undo_flags;
1350         }
1351
1352         memset(new_slave, 0, sizeof(struct slave));
1353
1354         /* save slave's original flags before calling
1355          * netdev_set_master and dev_open
1356          */
1357         new_slave->original_flags = slave_dev->flags;
1358
1359         /*
1360          * Save slave's original ("permanent") mac address for modes
1361          * that need it, and for restoring it upon release, and then
1362          * set it to the master's address
1363          */
1364         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1365
1366         /*
1367          * Set slave to master's mac address.  The application already
1368          * set the master's mac address to that of the first slave
1369          */
1370         memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1371         addr.sa_family = slave_dev->type;
1372         res = dev_set_mac_address(slave_dev, &addr);
1373         if (res) {
1374                 dprintk("Error %d calling set_mac_address\n", res);
1375                 goto err_free;
1376         }
1377
1378         /* open the slave since the application closed it */
1379         res = dev_open(slave_dev);
1380         if (res) {
1381                 dprintk("Openning slave %s failed\n", slave_dev->name);
1382                 goto err_restore_mac;
1383         }
1384
1385         res = netdev_set_master(slave_dev, bond_dev);
1386         if (res) {
1387                 dprintk("Error %d calling netdev_set_master\n", res);
1388                 goto err_close;
1389         }
1390
1391         new_slave->dev = slave_dev;
1392         slave_dev->priv_flags |= IFF_BONDING;
1393
1394         if ((bond->params.mode == BOND_MODE_TLB) ||
1395             (bond->params.mode == BOND_MODE_ALB)) {
1396                 /* bond_alb_init_slave() must be called before all other stages since
1397                  * it might fail and we do not want to have to undo everything
1398                  */
1399                 res = bond_alb_init_slave(bond, new_slave);
1400                 if (res) {
1401                         goto err_unset_master;
1402                 }
1403         }
1404
1405         /* If the mode USES_PRIMARY, then the new slave gets the
1406          * master's promisc (and mc) settings only if it becomes the
1407          * curr_active_slave, and that is taken care of later when calling
1408          * bond_change_active()
1409          */
1410         if (!USES_PRIMARY(bond->params.mode)) {
1411                 /* set promiscuity level to new slave */
1412                 if (bond_dev->flags & IFF_PROMISC) {
1413                         dev_set_promiscuity(slave_dev, 1);
1414                 }
1415
1416                 /* set allmulti level to new slave */
1417                 if (bond_dev->flags & IFF_ALLMULTI) {
1418                         dev_set_allmulti(slave_dev, 1);
1419                 }
1420
1421                 /* upload master's mc_list to new slave */
1422                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1423                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1424                 }
1425         }
1426
1427         if (bond->params.mode == BOND_MODE_8023AD) {
1428                 /* add lacpdu mc addr to mc list */
1429                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1430
1431                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1432         }
1433
1434         bond_add_vlans_on_slave(bond, slave_dev);
1435
1436         write_lock_bh(&bond->lock);
1437
1438         bond_attach_slave(bond, new_slave);
1439
1440         new_slave->delay = 0;
1441         new_slave->link_failure_count = 0;
1442
1443         bond_compute_features(bond);
1444
1445         new_slave->last_arp_rx = jiffies;
1446
1447         if (bond->params.miimon && !bond->params.use_carrier) {
1448                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1449
1450                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1451                         /*
1452                          * miimon is set but a bonded network driver
1453                          * does not support ETHTOOL/MII and
1454                          * arp_interval is not set.  Note: if
1455                          * use_carrier is enabled, we will never go
1456                          * here (because netif_carrier is always
1457                          * supported); thus, we don't need to change
1458                          * the messages for netif_carrier.
1459                          */
1460                         printk(KERN_WARNING DRV_NAME
1461                                ": %s: Warning: MII and ETHTOOL support not "
1462                                "available for interface %s, and "
1463                                "arp_interval/arp_ip_target module parameters "
1464                                "not specified, thus bonding will not detect "
1465                                "link failures! see bonding.txt for details.\n",
1466                                bond_dev->name, slave_dev->name);
1467                 } else if (link_reporting == -1) {
1468                         /* unable get link status using mii/ethtool */
1469                         printk(KERN_WARNING DRV_NAME
1470                                ": %s: Warning: can't get link status from "
1471                                "interface %s; the network driver associated "
1472                                "with this interface does not support MII or "
1473                                "ETHTOOL link status reporting, thus miimon "
1474                                "has no effect on this interface.\n",
1475                                bond_dev->name, slave_dev->name);
1476                 }
1477         }
1478
1479         /* check for initial state */
1480         if (!bond->params.miimon ||
1481             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1482                 if (bond->params.updelay) {
1483                         dprintk("Initial state of slave_dev is "
1484                                 "BOND_LINK_BACK\n");
1485                         new_slave->link  = BOND_LINK_BACK;
1486                         new_slave->delay = bond->params.updelay;
1487                 } else {
1488                         dprintk("Initial state of slave_dev is "
1489                                 "BOND_LINK_UP\n");
1490                         new_slave->link  = BOND_LINK_UP;
1491                 }
1492                 new_slave->jiffies = jiffies;
1493         } else {
1494                 dprintk("Initial state of slave_dev is "
1495                         "BOND_LINK_DOWN\n");
1496                 new_slave->link  = BOND_LINK_DOWN;
1497         }
1498
1499         if (bond_update_speed_duplex(new_slave) &&
1500             (new_slave->link != BOND_LINK_DOWN)) {
1501                 printk(KERN_WARNING DRV_NAME
1502                        ": %s: Warning: failed to get speed and duplex from %s, "
1503                        "assumed to be 100Mb/sec and Full.\n",
1504                        bond_dev->name, new_slave->dev->name);
1505
1506                 if (bond->params.mode == BOND_MODE_8023AD) {
1507                         printk(KERN_WARNING DRV_NAME
1508                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1509                                "support in base driver for proper aggregator "
1510                                "selection.\n", bond_dev->name);
1511                 }
1512         }
1513
1514         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1515                 /* if there is a primary slave, remember it */
1516                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1517                         bond->primary_slave = new_slave;
1518                 }
1519         }
1520
1521         switch (bond->params.mode) {
1522         case BOND_MODE_ACTIVEBACKUP:
1523                 bond_set_slave_inactive_flags(new_slave);
1524                 bond_select_active_slave(bond);
1525                 break;
1526         case BOND_MODE_8023AD:
1527                 /* in 802.3ad mode, the internal mechanism
1528                  * will activate the slaves in the selected
1529                  * aggregator
1530                  */
1531                 bond_set_slave_inactive_flags(new_slave);
1532                 /* if this is the first slave */
1533                 if (bond->slave_cnt == 1) {
1534                         SLAVE_AD_INFO(new_slave).id = 1;
1535                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1536                          * can be called only after the mac address of the bond is set
1537                          */
1538                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1539                                             bond->params.lacp_fast);
1540                 } else {
1541                         SLAVE_AD_INFO(new_slave).id =
1542                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1543                 }
1544
1545                 bond_3ad_bind_slave(new_slave);
1546                 break;
1547         case BOND_MODE_TLB:
1548         case BOND_MODE_ALB:
1549                 new_slave->state = BOND_STATE_ACTIVE;
1550                 if ((!bond->curr_active_slave) &&
1551                     (new_slave->link != BOND_LINK_DOWN)) {
1552                         /* first slave or no active slave yet, and this link
1553                          * is OK, so make this interface the active one
1554                          */
1555                         bond_change_active_slave(bond, new_slave);
1556                 } else {
1557                         bond_set_slave_inactive_flags(new_slave);
1558                 }
1559                 break;
1560         default:
1561                 dprintk("This slave is always active in trunk mode\n");
1562
1563                 /* always active in trunk mode */
1564                 new_slave->state = BOND_STATE_ACTIVE;
1565
1566                 /* In trunking mode there is little meaning to curr_active_slave
1567                  * anyway (it holds no special properties of the bond device),
1568                  * so we can change it without calling change_active_interface()
1569                  */
1570                 if (!bond->curr_active_slave) {
1571                         bond->curr_active_slave = new_slave;
1572                 }
1573                 break;
1574         } /* switch(bond_mode) */
1575
1576         bond_set_carrier(bond);
1577
1578         write_unlock_bh(&bond->lock);
1579
1580         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1581         if (res)
1582                 goto err_unset_master;
1583
1584         printk(KERN_INFO DRV_NAME
1585                ": %s: enslaving %s as a%s interface with a%s link.\n",
1586                bond_dev->name, slave_dev->name,
1587                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1588                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1589
1590         /* enslave is successful */
1591         return 0;
1592
1593 /* Undo stages on error */
1594 err_unset_master:
1595         netdev_set_master(slave_dev, NULL);
1596
1597 err_close:
1598         dev_close(slave_dev);
1599
1600 err_restore_mac:
1601         memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1602         addr.sa_family = slave_dev->type;
1603         dev_set_mac_address(slave_dev, &addr);
1604
1605 err_free:
1606         kfree(new_slave);
1607
1608 err_undo_flags:
1609         bond_dev->features = old_features;
1610
1611         return res;
1612 }
1613
1614 /*
1615  * Try to release the slave device <slave> from the bond device <master>
1616  * It is legal to access curr_active_slave without a lock because all the function
1617  * is write-locked.
1618  *
1619  * The rules for slave state should be:
1620  *   for Active/Backup:
1621  *     Active stays on all backups go down
1622  *   for Bonded connections:
1623  *     The first up interface should be left on and all others downed.
1624  */
1625 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1626 {
1627         struct bonding *bond = bond_dev->priv;
1628         struct slave *slave, *oldcurrent;
1629         struct sockaddr addr;
1630         int mac_addr_differ;
1631
1632         /* slave is not a slave or master is not master of this slave */
1633         if (!(slave_dev->flags & IFF_SLAVE) ||
1634             (slave_dev->master != bond_dev)) {
1635                 printk(KERN_ERR DRV_NAME
1636                        ": %s: Error: cannot release %s.\n",
1637                        bond_dev->name, slave_dev->name);
1638                 return -EINVAL;
1639         }
1640
1641         write_lock_bh(&bond->lock);
1642
1643         slave = bond_get_slave_by_dev(bond, slave_dev);
1644         if (!slave) {
1645                 /* not a slave of this bond */
1646                 printk(KERN_INFO DRV_NAME
1647                        ": %s: %s not enslaved\n",
1648                        bond_dev->name, slave_dev->name);
1649                 write_unlock_bh(&bond->lock);
1650                 return -EINVAL;
1651         }
1652
1653         mac_addr_differ = memcmp(bond_dev->dev_addr,
1654                                  slave->perm_hwaddr,
1655                                  ETH_ALEN);
1656         if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1657                 printk(KERN_WARNING DRV_NAME
1658                        ": %s: Warning: the permanent HWaddr of %s "
1659                        "- %02X:%02X:%02X:%02X:%02X:%02X - is "
1660                        "still in use by %s. Set the HWaddr of "
1661                        "%s to a different address to avoid "
1662                        "conflicts.\n",
1663                        bond_dev->name,
1664                        slave_dev->name,
1665                        slave->perm_hwaddr[0],
1666                        slave->perm_hwaddr[1],
1667                        slave->perm_hwaddr[2],
1668                        slave->perm_hwaddr[3],
1669                        slave->perm_hwaddr[4],
1670                        slave->perm_hwaddr[5],
1671                        bond_dev->name,
1672                        slave_dev->name);
1673         }
1674
1675         /* Inform AD package of unbinding of slave. */
1676         if (bond->params.mode == BOND_MODE_8023AD) {
1677                 /* must be called before the slave is
1678                  * detached from the list
1679                  */
1680                 bond_3ad_unbind_slave(slave);
1681         }
1682
1683         printk(KERN_INFO DRV_NAME
1684                ": %s: releasing %s interface %s\n",
1685                bond_dev->name,
1686                (slave->state == BOND_STATE_ACTIVE)
1687                ? "active" : "backup",
1688                slave_dev->name);
1689
1690         oldcurrent = bond->curr_active_slave;
1691
1692         bond->current_arp_slave = NULL;
1693
1694         /* release the slave from its bond */
1695         bond_detach_slave(bond, slave);
1696
1697         bond_compute_features(bond);
1698
1699         if (bond->primary_slave == slave) {
1700                 bond->primary_slave = NULL;
1701         }
1702
1703         if (oldcurrent == slave) {
1704                 bond_change_active_slave(bond, NULL);
1705         }
1706
1707         if ((bond->params.mode == BOND_MODE_TLB) ||
1708             (bond->params.mode == BOND_MODE_ALB)) {
1709                 /* Must be called only after the slave has been
1710                  * detached from the list and the curr_active_slave
1711                  * has been cleared (if our_slave == old_current),
1712                  * but before a new active slave is selected.
1713                  */
1714                 bond_alb_deinit_slave(bond, slave);
1715         }
1716
1717         if (oldcurrent == slave)
1718                 bond_select_active_slave(bond);
1719
1720         if (bond->slave_cnt == 0) {
1721                 bond_set_carrier(bond);
1722
1723                 /* if the last slave was removed, zero the mac address
1724                  * of the master so it will be set by the application
1725                  * to the mac address of the first slave
1726                  */
1727                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1728
1729                 if (list_empty(&bond->vlan_list)) {
1730                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1731                 } else {
1732                         printk(KERN_WARNING DRV_NAME
1733                                ": %s: Warning: clearing HW address of %s while it "
1734                                "still has VLANs.\n",
1735                                bond_dev->name, bond_dev->name);
1736                         printk(KERN_WARNING DRV_NAME
1737                                ": %s: When re-adding slaves, make sure the bond's "
1738                                "HW address matches its VLANs'.\n",
1739                                bond_dev->name);
1740                 }
1741         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1742                    !bond_has_challenged_slaves(bond)) {
1743                 printk(KERN_INFO DRV_NAME
1744                        ": %s: last VLAN challenged slave %s "
1745                        "left bond %s. VLAN blocking is removed\n",
1746                        bond_dev->name, slave_dev->name, bond_dev->name);
1747                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1748         }
1749
1750         write_unlock_bh(&bond->lock);
1751
1752         /* must do this from outside any spinlocks */
1753         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1754
1755         bond_del_vlans_from_slave(bond, slave_dev);
1756
1757         /* If the mode USES_PRIMARY, then we should only remove its
1758          * promisc and mc settings if it was the curr_active_slave, but that was
1759          * already taken care of above when we detached the slave
1760          */
1761         if (!USES_PRIMARY(bond->params.mode)) {
1762                 /* unset promiscuity level from slave */
1763                 if (bond_dev->flags & IFF_PROMISC) {
1764                         dev_set_promiscuity(slave_dev, -1);
1765                 }
1766
1767                 /* unset allmulti level from slave */
1768                 if (bond_dev->flags & IFF_ALLMULTI) {
1769                         dev_set_allmulti(slave_dev, -1);
1770                 }
1771
1772                 /* flush master's mc_list from slave */
1773                 bond_mc_list_flush(bond_dev, slave_dev);
1774         }
1775
1776         netdev_set_master(slave_dev, NULL);
1777
1778         /* close slave before restoring its mac address */
1779         dev_close(slave_dev);
1780
1781         /* restore original ("permanent") mac address */
1782         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1783         addr.sa_family = slave_dev->type;
1784         dev_set_mac_address(slave_dev, &addr);
1785
1786         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1787                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1788                                    IFF_SLAVE_NEEDARP);
1789
1790         kfree(slave);
1791
1792         return 0;  /* deletion OK */
1793 }
1794
1795 /*
1796  * This function releases all slaves.
1797  */
1798 static int bond_release_all(struct net_device *bond_dev)
1799 {
1800         struct bonding *bond = bond_dev->priv;
1801         struct slave *slave;
1802         struct net_device *slave_dev;
1803         struct sockaddr addr;
1804
1805         write_lock_bh(&bond->lock);
1806
1807         netif_carrier_off(bond_dev);
1808
1809         if (bond->slave_cnt == 0) {
1810                 goto out;
1811         }
1812
1813         bond->current_arp_slave = NULL;
1814         bond->primary_slave = NULL;
1815         bond_change_active_slave(bond, NULL);
1816
1817         while ((slave = bond->first_slave) != NULL) {
1818                 /* Inform AD package of unbinding of slave
1819                  * before slave is detached from the list.
1820                  */
1821                 if (bond->params.mode == BOND_MODE_8023AD) {
1822                         bond_3ad_unbind_slave(slave);
1823                 }
1824
1825                 slave_dev = slave->dev;
1826                 bond_detach_slave(bond, slave);
1827
1828                 if ((bond->params.mode == BOND_MODE_TLB) ||
1829                     (bond->params.mode == BOND_MODE_ALB)) {
1830                         /* must be called only after the slave
1831                          * has been detached from the list
1832                          */
1833                         bond_alb_deinit_slave(bond, slave);
1834                 }
1835
1836                 bond_compute_features(bond);
1837
1838                 /* now that the slave is detached, unlock and perform
1839                  * all the undo steps that should not be called from
1840                  * within a lock.
1841                  */
1842                 write_unlock_bh(&bond->lock);
1843
1844                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1845                 bond_del_vlans_from_slave(bond, slave_dev);
1846
1847                 /* If the mode USES_PRIMARY, then we should only remove its
1848                  * promisc and mc settings if it was the curr_active_slave, but that was
1849                  * already taken care of above when we detached the slave
1850                  */
1851                 if (!USES_PRIMARY(bond->params.mode)) {
1852                         /* unset promiscuity level from slave */
1853                         if (bond_dev->flags & IFF_PROMISC) {
1854                                 dev_set_promiscuity(slave_dev, -1);
1855                         }
1856
1857                         /* unset allmulti level from slave */
1858                         if (bond_dev->flags & IFF_ALLMULTI) {
1859                                 dev_set_allmulti(slave_dev, -1);
1860                         }
1861
1862                         /* flush master's mc_list from slave */
1863                         bond_mc_list_flush(bond_dev, slave_dev);
1864                 }
1865
1866                 netdev_set_master(slave_dev, NULL);
1867
1868                 /* close slave before restoring its mac address */
1869                 dev_close(slave_dev);
1870
1871                 /* restore original ("permanent") mac address*/
1872                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1873                 addr.sa_family = slave_dev->type;
1874                 dev_set_mac_address(slave_dev, &addr);
1875
1876                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1877                                            IFF_SLAVE_INACTIVE);
1878
1879                 kfree(slave);
1880
1881                 /* re-acquire the lock before getting the next slave */
1882                 write_lock_bh(&bond->lock);
1883         }
1884
1885         /* zero the mac address of the master so it will be
1886          * set by the application to the mac address of the
1887          * first slave
1888          */
1889         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1890
1891         if (list_empty(&bond->vlan_list)) {
1892                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1893         } else {
1894                 printk(KERN_WARNING DRV_NAME
1895                        ": %s: Warning: clearing HW address of %s while it "
1896                        "still has VLANs.\n",
1897                        bond_dev->name, bond_dev->name);
1898                 printk(KERN_WARNING DRV_NAME
1899                        ": %s: When re-adding slaves, make sure the bond's "
1900                        "HW address matches its VLANs'.\n",
1901                        bond_dev->name);
1902         }
1903
1904         printk(KERN_INFO DRV_NAME
1905                ": %s: released all slaves\n",
1906                bond_dev->name);
1907
1908 out:
1909         write_unlock_bh(&bond->lock);
1910
1911         return 0;
1912 }
1913
1914 /*
1915  * This function changes the active slave to slave <slave_dev>.
1916  * It returns -EINVAL in the following cases.
1917  *  - <slave_dev> is not found in the list.
1918  *  - There is not active slave now.
1919  *  - <slave_dev> is already active.
1920  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1921  *  - <slave_dev> is not running.
1922  * In these cases, this fuction does nothing.
1923  * In the other cases, currnt_slave pointer is changed and 0 is returned.
1924  */
1925 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1926 {
1927         struct bonding *bond = bond_dev->priv;
1928         struct slave *old_active = NULL;
1929         struct slave *new_active = NULL;
1930         int res = 0;
1931
1932         if (!USES_PRIMARY(bond->params.mode)) {
1933                 return -EINVAL;
1934         }
1935
1936         /* Verify that master_dev is indeed the master of slave_dev */
1937         if (!(slave_dev->flags & IFF_SLAVE) ||
1938             (slave_dev->master != bond_dev)) {
1939                 return -EINVAL;
1940         }
1941
1942         write_lock_bh(&bond->lock);
1943
1944         old_active = bond->curr_active_slave;
1945         new_active = bond_get_slave_by_dev(bond, slave_dev);
1946
1947         /*
1948          * Changing to the current active: do nothing; return success.
1949          */
1950         if (new_active && (new_active == old_active)) {
1951                 write_unlock_bh(&bond->lock);
1952                 return 0;
1953         }
1954
1955         if ((new_active) &&
1956             (old_active) &&
1957             (new_active->link == BOND_LINK_UP) &&
1958             IS_UP(new_active->dev)) {
1959                 bond_change_active_slave(bond, new_active);
1960         } else {
1961                 res = -EINVAL;
1962         }
1963
1964         write_unlock_bh(&bond->lock);
1965
1966         return res;
1967 }
1968
1969 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1970 {
1971         struct bonding *bond = bond_dev->priv;
1972
1973         info->bond_mode = bond->params.mode;
1974         info->miimon = bond->params.miimon;
1975
1976         read_lock_bh(&bond->lock);
1977         info->num_slaves = bond->slave_cnt;
1978         read_unlock_bh(&bond->lock);
1979
1980         return 0;
1981 }
1982
1983 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1984 {
1985         struct bonding *bond = bond_dev->priv;
1986         struct slave *slave;
1987         int i, found = 0;
1988
1989         if (info->slave_id < 0) {
1990                 return -ENODEV;
1991         }
1992
1993         read_lock_bh(&bond->lock);
1994
1995         bond_for_each_slave(bond, slave, i) {
1996                 if (i == (int)info->slave_id) {
1997                         found = 1;
1998                         break;
1999                 }
2000         }
2001
2002         read_unlock_bh(&bond->lock);
2003
2004         if (found) {
2005                 strcpy(info->slave_name, slave->dev->name);
2006                 info->link = slave->link;
2007                 info->state = slave->state;
2008                 info->link_failure_count = slave->link_failure_count;
2009         } else {
2010                 return -ENODEV;
2011         }
2012
2013         return 0;
2014 }
2015
2016 /*-------------------------------- Monitoring -------------------------------*/
2017
2018 /* this function is called regularly to monitor each slave's link. */
2019 void bond_mii_monitor(struct net_device *bond_dev)
2020 {
2021         struct bonding *bond = bond_dev->priv;
2022         struct slave *slave, *oldcurrent;
2023         int do_failover = 0;
2024         int delta_in_ticks;
2025         int i;
2026
2027         read_lock(&bond->lock);
2028
2029         delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2030
2031         if (bond->kill_timers) {
2032                 goto out;
2033         }
2034
2035         if (bond->slave_cnt == 0) {
2036                 goto re_arm;
2037         }
2038
2039         /* we will try to read the link status of each of our slaves, and
2040          * set their IFF_RUNNING flag appropriately. For each slave not
2041          * supporting MII status, we won't do anything so that a user-space
2042          * program could monitor the link itself if needed.
2043          */
2044
2045         read_lock(&bond->curr_slave_lock);
2046         oldcurrent = bond->curr_active_slave;
2047         read_unlock(&bond->curr_slave_lock);
2048
2049         bond_for_each_slave(bond, slave, i) {
2050                 struct net_device *slave_dev = slave->dev;
2051                 int link_state;
2052                 u16 old_speed = slave->speed;
2053                 u8 old_duplex = slave->duplex;
2054
2055                 link_state = bond_check_dev_link(bond, slave_dev, 0);
2056
2057                 switch (slave->link) {
2058                 case BOND_LINK_UP:      /* the link was up */
2059                         if (link_state == BMSR_LSTATUS) {
2060                                 /* link stays up, nothing more to do */
2061                                 break;
2062                         } else { /* link going down */
2063                                 slave->link  = BOND_LINK_FAIL;
2064                                 slave->delay = bond->params.downdelay;
2065
2066                                 if (slave->link_failure_count < UINT_MAX) {
2067                                         slave->link_failure_count++;
2068                                 }
2069
2070                                 if (bond->params.downdelay) {
2071                                         printk(KERN_INFO DRV_NAME
2072                                                ": %s: link status down for %s "
2073                                                "interface %s, disabling it in "
2074                                                "%d ms.\n",
2075                                                bond_dev->name,
2076                                                IS_UP(slave_dev)
2077                                                ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2078                                                   ? ((slave == oldcurrent)
2079                                                      ? "active " : "backup ")
2080                                                   : "")
2081                                                : "idle ",
2082                                                slave_dev->name,
2083                                                bond->params.downdelay * bond->params.miimon);
2084                                 }
2085                         }
2086                         /* no break ! fall through the BOND_LINK_FAIL test to
2087                            ensure proper action to be taken
2088                         */
2089                 case BOND_LINK_FAIL:    /* the link has just gone down */
2090                         if (link_state != BMSR_LSTATUS) {
2091                                 /* link stays down */
2092                                 if (slave->delay <= 0) {
2093                                         /* link down for too long time */
2094                                         slave->link = BOND_LINK_DOWN;
2095
2096                                         /* in active/backup mode, we must
2097                                          * completely disable this interface
2098                                          */
2099                                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2100                                             (bond->params.mode == BOND_MODE_8023AD)) {
2101                                                 bond_set_slave_inactive_flags(slave);
2102                                         }
2103
2104                                         printk(KERN_INFO DRV_NAME
2105                                                ": %s: link status definitely "
2106                                                "down for interface %s, "
2107                                                "disabling it\n",
2108                                                bond_dev->name,
2109                                                slave_dev->name);
2110
2111                                         /* notify ad that the link status has changed */
2112                                         if (bond->params.mode == BOND_MODE_8023AD) {
2113                                                 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2114                                         }
2115
2116                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2117                                             (bond->params.mode == BOND_MODE_ALB)) {
2118                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2119                                         }
2120
2121                                         if (slave == oldcurrent) {
2122                                                 do_failover = 1;
2123                                         }
2124                                 } else {
2125                                         slave->delay--;
2126                                 }
2127                         } else {
2128                                 /* link up again */
2129                                 slave->link  = BOND_LINK_UP;
2130                                 slave->jiffies = jiffies;
2131                                 printk(KERN_INFO DRV_NAME
2132                                        ": %s: link status up again after %d "
2133                                        "ms for interface %s.\n",
2134                                        bond_dev->name,
2135                                        (bond->params.downdelay - slave->delay) * bond->params.miimon,
2136                                        slave_dev->name);
2137                         }
2138                         break;
2139                 case BOND_LINK_DOWN:    /* the link was down */
2140                         if (link_state != BMSR_LSTATUS) {
2141                                 /* the link stays down, nothing more to do */
2142                                 break;
2143                         } else {        /* link going up */
2144                                 slave->link  = BOND_LINK_BACK;
2145                                 slave->delay = bond->params.updelay;
2146
2147                                 if (bond->params.updelay) {
2148                                         /* if updelay == 0, no need to
2149                                            advertise about a 0 ms delay */
2150                                         printk(KERN_INFO DRV_NAME
2151                                                ": %s: link status up for "
2152                                                "interface %s, enabling it "
2153                                                "in %d ms.\n",
2154                                                bond_dev->name,
2155                                                slave_dev->name,
2156                                                bond->params.updelay * bond->params.miimon);
2157                                 }
2158                         }
2159                         /* no break ! fall through the BOND_LINK_BACK state in
2160                            case there's something to do.
2161                         */
2162                 case BOND_LINK_BACK:    /* the link has just come back */
2163                         if (link_state != BMSR_LSTATUS) {
2164                                 /* link down again */
2165                                 slave->link  = BOND_LINK_DOWN;
2166
2167                                 printk(KERN_INFO DRV_NAME
2168                                        ": %s: link status down again after %d "
2169                                        "ms for interface %s.\n",
2170                                        bond_dev->name,
2171                                        (bond->params.updelay - slave->delay) * bond->params.miimon,
2172                                        slave_dev->name);
2173                         } else {
2174                                 /* link stays up */
2175                                 if (slave->delay == 0) {
2176                                         /* now the link has been up for long time enough */
2177                                         slave->link = BOND_LINK_UP;
2178                                         slave->jiffies = jiffies;
2179
2180                                         if (bond->params.mode == BOND_MODE_8023AD) {
2181                                                 /* prevent it from being the active one */
2182                                                 slave->state = BOND_STATE_BACKUP;
2183                                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2184                                                 /* make it immediately active */
2185                                                 slave->state = BOND_STATE_ACTIVE;
2186                                         } else if (slave != bond->primary_slave) {
2187                                                 /* prevent it from being the active one */
2188                                                 slave->state = BOND_STATE_BACKUP;
2189                                         }
2190
2191                                         printk(KERN_INFO DRV_NAME
2192                                                ": %s: link status definitely "
2193                                                "up for interface %s.\n",
2194                                                bond_dev->name,
2195                                                slave_dev->name);
2196
2197                                         /* notify ad that the link status has changed */
2198                                         if (bond->params.mode == BOND_MODE_8023AD) {
2199                                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2200                                         }
2201
2202                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2203                                             (bond->params.mode == BOND_MODE_ALB)) {
2204                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2205                                         }
2206
2207                                         if ((!oldcurrent) ||
2208                                             (slave == bond->primary_slave)) {
2209                                                 do_failover = 1;
2210                                         }
2211                                 } else {
2212                                         slave->delay--;
2213                                 }
2214                         }
2215                         break;
2216                 default:
2217                         /* Should not happen */
2218                         printk(KERN_ERR DRV_NAME
2219                                ": %s: Error: %s Illegal value (link=%d)\n",
2220                                bond_dev->name,
2221                                slave->dev->name,
2222                                slave->link);
2223                         goto out;
2224                 } /* end of switch (slave->link) */
2225
2226                 bond_update_speed_duplex(slave);
2227
2228                 if (bond->params.mode == BOND_MODE_8023AD) {
2229                         if (old_speed != slave->speed) {
2230                                 bond_3ad_adapter_speed_changed(slave);
2231                         }
2232
2233                         if (old_duplex != slave->duplex) {
2234                                 bond_3ad_adapter_duplex_changed(slave);
2235                         }
2236                 }
2237
2238         } /* end of for */
2239
2240         if (do_failover) {
2241                 write_lock(&bond->curr_slave_lock);
2242
2243                 bond_select_active_slave(bond);
2244
2245                 write_unlock(&bond->curr_slave_lock);
2246         } else
2247                 bond_set_carrier(bond);
2248
2249 re_arm:
2250         if (bond->params.miimon) {
2251                 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2252         }
2253 out:
2254         read_unlock(&bond->lock);
2255 }
2256
2257
2258 static u32 bond_glean_dev_ip(struct net_device *dev)
2259 {
2260         struct in_device *idev;
2261         struct in_ifaddr *ifa;
2262         __be32 addr = 0;
2263
2264         if (!dev)
2265                 return 0;
2266
2267         rcu_read_lock();
2268         idev = __in_dev_get_rcu(dev);
2269         if (!idev)
2270                 goto out;
2271
2272         ifa = idev->ifa_list;
2273         if (!ifa)
2274                 goto out;
2275
2276         addr = ifa->ifa_local;
2277 out:
2278         rcu_read_unlock();
2279         return addr;
2280 }
2281
2282 static int bond_has_ip(struct bonding *bond)
2283 {
2284         struct vlan_entry *vlan, *vlan_next;
2285
2286         if (bond->master_ip)
2287                 return 1;
2288
2289         if (list_empty(&bond->vlan_list))
2290                 return 0;
2291
2292         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2293                                  vlan_list) {
2294                 if (vlan->vlan_ip)
2295                         return 1;
2296         }
2297
2298         return 0;
2299 }
2300
2301 static int bond_has_this_ip(struct bonding *bond, u32 ip)
2302 {
2303         struct vlan_entry *vlan, *vlan_next;
2304
2305         if (ip == bond->master_ip)
2306                 return 1;
2307
2308         if (list_empty(&bond->vlan_list))
2309                 return 0;
2310
2311         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2312                                  vlan_list) {
2313                 if (ip == vlan->vlan_ip)
2314                         return 1;
2315         }
2316
2317         return 0;
2318 }
2319
2320 /*
2321  * We go to the (large) trouble of VLAN tagging ARP frames because
2322  * switches in VLAN mode (especially if ports are configured as
2323  * "native" to a VLAN) might not pass non-tagged frames.
2324  */
2325 static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
2326 {
2327         struct sk_buff *skb;
2328
2329         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2330                slave_dev->name, dest_ip, src_ip, vlan_id);
2331
2332         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2333                          NULL, slave_dev->dev_addr, NULL);
2334
2335         if (!skb) {
2336                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2337                 return;
2338         }
2339         if (vlan_id) {
2340                 skb = vlan_put_tag(skb, vlan_id);
2341                 if (!skb) {
2342                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2343                         return;
2344                 }
2345         }
2346         arp_xmit(skb);
2347 }
2348
2349
2350 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2351 {
2352         int i, vlan_id, rv;
2353         u32 *targets = bond->params.arp_targets;
2354         struct vlan_entry *vlan, *vlan_next;
2355         struct net_device *vlan_dev;
2356         struct flowi fl;
2357         struct rtable *rt;
2358
2359         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2360                 if (!targets[i])
2361                         continue;
2362                 dprintk("basa: target %x\n", targets[i]);
2363                 if (list_empty(&bond->vlan_list)) {
2364                         dprintk("basa: empty vlan: arp_send\n");
2365                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2366                                       bond->master_ip, 0);
2367                         continue;
2368                 }
2369
2370                 /*
2371                  * If VLANs are configured, we do a route lookup to
2372                  * determine which VLAN interface would be used, so we
2373                  * can tag the ARP with the proper VLAN tag.
2374                  */
2375                 memset(&fl, 0, sizeof(fl));
2376                 fl.fl4_dst = targets[i];
2377                 fl.fl4_tos = RTO_ONLINK;
2378
2379                 rv = ip_route_output_key(&rt, &fl);
2380                 if (rv) {
2381                         if (net_ratelimit()) {
2382                                 printk(KERN_WARNING DRV_NAME
2383                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2384                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2385                         }
2386                         continue;
2387                 }
2388
2389                 /*
2390                  * This target is not on a VLAN
2391                  */
2392                 if (rt->u.dst.dev == bond->dev) {
2393                         ip_rt_put(rt);
2394                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2395                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2396                                       bond->master_ip, 0);
2397                         continue;
2398                 }
2399
2400                 vlan_id = 0;
2401                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2402                                          vlan_list) {
2403                         vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2404                         if (vlan_dev == rt->u.dst.dev) {
2405                                 vlan_id = vlan->vlan_id;
2406                                 dprintk("basa: vlan match on %s %d\n",
2407                                        vlan_dev->name, vlan_id);
2408                                 break;
2409                         }
2410                 }
2411
2412                 if (vlan_id) {
2413                         ip_rt_put(rt);
2414                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2415                                       vlan->vlan_ip, vlan_id);
2416                         continue;
2417                 }
2418
2419                 if (net_ratelimit()) {
2420                         printk(KERN_WARNING DRV_NAME
2421                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2422                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2423                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2424                 }
2425                 ip_rt_put(rt);
2426         }
2427 }
2428
2429 /*
2430  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2431  * for each VLAN above us.
2432  */
2433 static void bond_send_gratuitous_arp(struct bonding *bond)
2434 {
2435         struct slave *slave = bond->curr_active_slave;
2436         struct vlan_entry *vlan;
2437         struct net_device *vlan_dev;
2438
2439         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2440                                 slave ? slave->dev->name : "NULL");
2441         if (!slave)
2442                 return;
2443
2444         if (bond->master_ip) {
2445                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2446                                   bond->master_ip, 0);
2447         }
2448
2449         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2450                 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2451                 if (vlan->vlan_ip) {
2452                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2453                                       vlan->vlan_ip, vlan->vlan_id);
2454                 }
2455         }
2456 }
2457
2458 static void bond_validate_arp(struct bonding *bond, struct slave *slave, u32 sip, u32 tip)
2459 {
2460         int i;
2461         u32 *targets = bond->params.arp_targets;
2462
2463         targets = bond->params.arp_targets;
2464         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2465                 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2466                         "%u.%u.%u.%u bhti(tip) %d\n",
2467                        NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2468                        bond_has_this_ip(bond, tip));
2469                 if (sip == targets[i]) {
2470                         if (bond_has_this_ip(bond, tip))
2471                                 slave->last_arp_rx = jiffies;
2472                         return;
2473                 }
2474         }
2475 }
2476
2477 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2478 {
2479         struct arphdr *arp;
2480         struct slave *slave;
2481         struct bonding *bond;
2482         unsigned char *arp_ptr;
2483         u32 sip, tip;
2484
2485         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2486                 goto out;
2487
2488         bond = dev->priv;
2489         read_lock(&bond->lock);
2490
2491         dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2492                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2493                 orig_dev ? orig_dev->name : "NULL");
2494
2495         slave = bond_get_slave_by_dev(bond, orig_dev);
2496         if (!slave || !slave_do_arp_validate(bond, slave))
2497                 goto out_unlock;
2498
2499         /* ARP header, plus 2 device addresses, plus 2 IP addresses.  */
2500         if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
2501                                  (2 * dev->addr_len) +
2502                                  (2 * sizeof(u32)))))
2503                 goto out_unlock;
2504
2505         arp = skb->nh.arph;
2506         if (arp->ar_hln != dev->addr_len ||
2507             skb->pkt_type == PACKET_OTHERHOST ||
2508             skb->pkt_type == PACKET_LOOPBACK ||
2509             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2510             arp->ar_pro != htons(ETH_P_IP) ||
2511             arp->ar_pln != 4)
2512                 goto out_unlock;
2513
2514         arp_ptr = (unsigned char *)(arp + 1);
2515         arp_ptr += dev->addr_len;
2516         memcpy(&sip, arp_ptr, 4);
2517         arp_ptr += 4 + dev->addr_len;
2518         memcpy(&tip, arp_ptr, 4);
2519
2520         dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2521                 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2522                 slave->state, bond->params.arp_validate,
2523                 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2524
2525         /*
2526          * Backup slaves won't see the ARP reply, but do come through
2527          * here for each ARP probe (so we swap the sip/tip to validate
2528          * the probe).  In a "redundant switch, common router" type of
2529          * configuration, the ARP probe will (hopefully) travel from
2530          * the active, through one switch, the router, then the other
2531          * switch before reaching the backup.
2532          */
2533         if (slave->state == BOND_STATE_ACTIVE)
2534                 bond_validate_arp(bond, slave, sip, tip);
2535         else
2536                 bond_validate_arp(bond, slave, tip, sip);
2537
2538 out_unlock:
2539         read_unlock(&bond->lock);
2540 out:
2541         dev_kfree_skb(skb);
2542         return NET_RX_SUCCESS;
2543 }
2544
2545 /*
2546  * this function is called regularly to monitor each slave's link
2547  * ensuring that traffic is being sent and received when arp monitoring
2548  * is used in load-balancing mode. if the adapter has been dormant, then an
2549  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2550  * arp monitoring in active backup mode.
2551  */
2552 void bond_loadbalance_arp_mon(struct net_device *bond_dev)
2553 {
2554         struct bonding *bond = bond_dev->priv;
2555         struct slave *slave, *oldcurrent;
2556         int do_failover = 0;
2557         int delta_in_ticks;
2558         int i;
2559
2560         read_lock(&bond->lock);
2561
2562         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2563
2564         if (bond->kill_timers) {
2565                 goto out;
2566         }
2567
2568         if (bond->slave_cnt == 0) {
2569                 goto re_arm;
2570         }
2571
2572         read_lock(&bond->curr_slave_lock);
2573         oldcurrent = bond->curr_active_slave;
2574         read_unlock(&bond->curr_slave_lock);
2575
2576         /* see if any of the previous devices are up now (i.e. they have
2577          * xmt and rcv traffic). the curr_active_slave does not come into
2578          * the picture unless it is null. also, slave->jiffies is not needed
2579          * here because we send an arp on each slave and give a slave as
2580          * long as it needs to get the tx/rx within the delta.
2581          * TODO: what about up/down delay in arp mode? it wasn't here before
2582          *       so it can wait
2583          */
2584         bond_for_each_slave(bond, slave, i) {
2585                 if (slave->link != BOND_LINK_UP) {
2586                         if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2587                             ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2588
2589                                 slave->link  = BOND_LINK_UP;
2590                                 slave->state = BOND_STATE_ACTIVE;
2591
2592                                 /* primary_slave has no meaning in round-robin
2593                                  * mode. the window of a slave being up and
2594                                  * curr_active_slave being null after enslaving
2595                                  * is closed.
2596                                  */
2597                                 if (!oldcurrent) {
2598                                         printk(KERN_INFO DRV_NAME
2599                                                ": %s: link status definitely "
2600                                                "up for interface %s, ",
2601                                                bond_dev->name,
2602                                                slave->dev->name);
2603                                         do_failover = 1;
2604                                 } else {
2605                                         printk(KERN_INFO DRV_NAME
2606                                                ": %s: interface %s is now up\n",
2607                                                bond_dev->name,
2608                                                slave->dev->name);
2609                                 }
2610                         }
2611                 } else {
2612                         /* slave->link == BOND_LINK_UP */
2613
2614                         /* not all switches will respond to an arp request
2615                          * when the source ip is 0, so don't take the link down
2616                          * if we don't know our ip yet
2617                          */
2618                         if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2619                             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2620                              bond_has_ip(bond))) {
2621
2622                                 slave->link  = BOND_LINK_DOWN;
2623                                 slave->state = BOND_STATE_BACKUP;
2624
2625                                 if (slave->link_failure_count < UINT_MAX) {
2626                                         slave->link_failure_count++;
2627                                 }
2628
2629                                 printk(KERN_INFO DRV_NAME
2630                                        ": %s: interface %s is now down.\n",
2631                                        bond_dev->name,
2632                                        slave->dev->name);
2633
2634                                 if (slave == oldcurrent) {
2635                                         do_failover = 1;
2636                                 }
2637                         }
2638                 }
2639
2640                 /* note: if switch is in round-robin mode, all links
2641                  * must tx arp to ensure all links rx an arp - otherwise
2642                  * links may oscillate or not come up at all; if switch is
2643                  * in something like xor mode, there is nothing we can
2644                  * do - all replies will be rx'ed on same link causing slaves
2645                  * to be unstable during low/no traffic periods
2646                  */
2647                 if (IS_UP(slave->dev)) {
2648                         bond_arp_send_all(bond, slave);
2649                 }
2650         }
2651
2652         if (do_failover) {
2653                 write_lock(&bond->curr_slave_lock);
2654
2655                 bond_select_active_slave(bond);
2656
2657                 write_unlock(&bond->curr_slave_lock);
2658         }
2659
2660 re_arm:
2661         if (bond->params.arp_interval) {
2662                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2663         }
2664 out:
2665         read_unlock(&bond->lock);
2666 }
2667
2668 /*
2669  * When using arp monitoring in active-backup mode, this function is
2670  * called to determine if any backup slaves have went down or a new
2671  * current slave needs to be found.
2672  * The backup slaves never generate traffic, they are considered up by merely
2673  * receiving traffic. If the current slave goes down, each backup slave will
2674  * be given the opportunity to tx/rx an arp before being taken down - this
2675  * prevents all slaves from being taken down due to the current slave not
2676  * sending any traffic for the backups to receive. The arps are not necessarily
2677  * necessary, any tx and rx traffic will keep the current slave up. While any
2678  * rx traffic will keep the backup slaves up, the current slave is responsible
2679  * for generating traffic to keep them up regardless of any other traffic they
2680  * may have received.
2681  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2682  */
2683 void bond_activebackup_arp_mon(struct net_device *bond_dev)
2684 {
2685         struct bonding *bond = bond_dev->priv;
2686         struct slave *slave;
2687         int delta_in_ticks;
2688         int i;
2689
2690         read_lock(&bond->lock);
2691
2692         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2693
2694         if (bond->kill_timers) {
2695                 goto out;
2696         }
2697
2698         if (bond->slave_cnt == 0) {
2699                 goto re_arm;
2700         }
2701
2702         /* determine if any slave has come up or any backup slave has
2703          * gone down
2704          * TODO: what about up/down delay in arp mode? it wasn't here before
2705          *       so it can wait
2706          */
2707         bond_for_each_slave(bond, slave, i) {
2708                 if (slave->link != BOND_LINK_UP) {
2709                         if ((jiffies - slave_last_rx(bond, slave)) <=
2710                              delta_in_ticks) {
2711
2712                                 slave->link = BOND_LINK_UP;
2713
2714                                 write_lock(&bond->curr_slave_lock);
2715
2716                                 if ((!bond->curr_active_slave) &&
2717                                     ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2718                                         bond_change_active_slave(bond, slave);
2719                                         bond->current_arp_slave = NULL;
2720                                 } else if (bond->curr_active_slave != slave) {
2721                                         /* this slave has just come up but we
2722                                          * already have a current slave; this
2723                                          * can also happen if bond_enslave adds
2724                                          * a new slave that is up while we are
2725                                          * searching for a new slave
2726                                          */
2727                                         bond_set_slave_inactive_flags(slave);
2728                                         bond->current_arp_slave = NULL;
2729                                 }
2730
2731                                 bond_set_carrier(bond);
2732
2733                                 if (slave == bond->curr_active_slave) {
2734                                         printk(KERN_INFO DRV_NAME
2735                                                ": %s: %s is up and now the "
2736                                                "active interface\n",
2737                                                bond_dev->name,
2738                                                slave->dev->name);
2739                                         netif_carrier_on(bond->dev);
2740                                 } else {
2741                                         printk(KERN_INFO DRV_NAME
2742                                                ": %s: backup interface %s is "
2743                                                "now up\n",
2744                                                bond_dev->name,
2745                                                slave->dev->name);
2746                                 }
2747
2748                                 write_unlock(&bond->curr_slave_lock);
2749                         }
2750                 } else {
2751                         read_lock(&bond->curr_slave_lock);
2752
2753                         if ((slave != bond->curr_active_slave) &&
2754                             (!bond->current_arp_slave) &&
2755                             (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
2756                              bond_has_ip(bond))) {
2757                                 /* a backup slave has gone down; three times
2758                                  * the delta allows the current slave to be
2759                                  * taken out before the backup slave.
2760                                  * note: a non-null current_arp_slave indicates
2761                                  * the curr_active_slave went down and we are
2762                                  * searching for a new one; under this
2763                                  * condition we only take the curr_active_slave
2764                                  * down - this gives each slave a chance to
2765                                  * tx/rx traffic before being taken out
2766                                  */
2767
2768                                 read_unlock(&bond->curr_slave_lock);
2769
2770                                 slave->link  = BOND_LINK_DOWN;
2771
2772                                 if (slave->link_failure_count < UINT_MAX) {
2773                                         slave->link_failure_count++;
2774                                 }
2775
2776                                 bond_set_slave_inactive_flags(slave);
2777
2778                                 printk(KERN_INFO DRV_NAME
2779                                        ": %s: backup interface %s is now down\n",
2780                                        bond_dev->name,
2781                                        slave->dev->name);
2782                         } else {
2783                                 read_unlock(&bond->curr_slave_lock);
2784                         }
2785                 }
2786         }
2787
2788         read_lock(&bond->curr_slave_lock);
2789         slave = bond->curr_active_slave;
2790         read_unlock(&bond->curr_slave_lock);
2791
2792         if (slave) {
2793                 /* if we have sent traffic in the past 2*arp_intervals but
2794                  * haven't xmit and rx traffic in that time interval, select
2795                  * a different slave. slave->jiffies is only updated when
2796                  * a slave first becomes the curr_active_slave - not necessarily
2797                  * after every arp; this ensures the slave has a full 2*delta
2798                  * before being taken out. if a primary is being used, check
2799                  * if it is up and needs to take over as the curr_active_slave
2800                  */
2801                 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2802             (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
2803              bond_has_ip(bond))) &&
2804                     ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2805
2806                         slave->link  = BOND_LINK_DOWN;
2807
2808                         if (slave->link_failure_count < UINT_MAX) {
2809                                 slave->link_failure_count++;
2810                         }
2811
2812                         printk(KERN_INFO DRV_NAME
2813                                ": %s: link status down for active interface "
2814                                "%s, disabling it\n",
2815                                bond_dev->name,
2816                                slave->dev->name);
2817
2818                         write_lock(&bond->curr_slave_lock);
2819
2820                         bond_select_active_slave(bond);
2821                         slave = bond->curr_active_slave;
2822
2823                         write_unlock(&bond->curr_slave_lock);
2824
2825                         bond->current_arp_slave = slave;
2826
2827                         if (slave) {
2828                                 slave->jiffies = jiffies;
2829                         }
2830                 } else if ((bond->primary_slave) &&
2831                            (bond->primary_slave != slave) &&
2832                            (bond->primary_slave->link == BOND_LINK_UP)) {
2833                         /* at this point, slave is the curr_active_slave */
2834                         printk(KERN_INFO DRV_NAME
2835                                ": %s: changing from interface %s to primary "
2836                                "interface %s\n",
2837                                bond_dev->name,
2838                                slave->dev->name,
2839                                bond->primary_slave->dev->name);
2840
2841                         /* primary is up so switch to it */
2842                         write_lock(&bond->curr_slave_lock);
2843                         bond_change_active_slave(bond, bond->primary_slave);
2844                         write_unlock(&bond->curr_slave_lock);
2845
2846                         slave = bond->primary_slave;
2847                         slave->jiffies = jiffies;
2848                 } else {
2849                         bond->current_arp_slave = NULL;
2850                 }
2851
2852                 /* the current slave must tx an arp to ensure backup slaves
2853                  * rx traffic
2854                  */
2855                 if (slave && bond_has_ip(bond)) {
2856                         bond_arp_send_all(bond, slave);
2857                 }
2858         }
2859
2860         /* if we don't have a curr_active_slave, search for the next available
2861          * backup slave from the current_arp_slave and make it the candidate
2862          * for becoming the curr_active_slave
2863          */
2864         if (!slave) {
2865                 if (!bond->current_arp_slave) {
2866                         bond->current_arp_slave = bond->first_slave;
2867                 }
2868
2869                 if (bond->current_arp_slave) {
2870                         bond_set_slave_inactive_flags(bond->current_arp_slave);
2871
2872                         /* search for next candidate */
2873                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2874                                 if (IS_UP(slave->dev)) {
2875                                         slave->link = BOND_LINK_BACK;
2876                                         bond_set_slave_active_flags(slave);
2877                                         bond_arp_send_all(bond, slave);
2878                                         slave->jiffies = jiffies;
2879                                         bond->current_arp_slave = slave;
2880                                         break;
2881                                 }
2882
2883                                 /* if the link state is up at this point, we
2884                                  * mark it down - this can happen if we have
2885                                  * simultaneous link failures and
2886                                  * reselect_active_interface doesn't make this
2887                                  * one the current slave so it is still marked
2888                                  * up when it is actually down
2889                                  */
2890                                 if (slave->link == BOND_LINK_UP) {
2891                                         slave->link  = BOND_LINK_DOWN;
2892                                         if (slave->link_failure_count < UINT_MAX) {
2893                                                 slave->link_failure_count++;
2894                                         }
2895
2896                                         bond_set_slave_inactive_flags(slave);
2897
2898                                         printk(KERN_INFO DRV_NAME
2899                                                ": %s: backup interface %s is "
2900                                                "now down.\n",
2901                                                bond_dev->name,
2902                                                slave->dev->name);
2903                                 }
2904                         }
2905                 }
2906         }
2907
2908 re_arm:
2909         if (bond->params.arp_interval) {
2910                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2911         }
2912 out:
2913         read_unlock(&bond->lock);
2914 }
2915
2916 /*------------------------------ proc/seq_file-------------------------------*/
2917
2918 #ifdef CONFIG_PROC_FS
2919
2920 #define SEQ_START_TOKEN ((void *)1)
2921
2922 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2923 {
2924         struct bonding *bond = seq->private;
2925         loff_t off = 0;
2926         struct slave *slave;
2927         int i;
2928
2929         /* make sure the bond won't be taken away */
2930         read_lock(&dev_base_lock);
2931         read_lock_bh(&bond->lock);
2932
2933         if (*pos == 0) {
2934                 return SEQ_START_TOKEN;
2935         }
2936
2937         bond_for_each_slave(bond, slave, i) {
2938                 if (++off == *pos) {
2939                         return slave;
2940                 }
2941         }
2942
2943         return NULL;
2944 }
2945
2946 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2947 {
2948         struct bonding *bond = seq->private;
2949         struct slave *slave = v;
2950
2951         ++*pos;
2952         if (v == SEQ_START_TOKEN) {
2953                 return bond->first_slave;
2954         }
2955
2956         slave = slave->next;
2957
2958         return (slave == bond->first_slave) ? NULL : slave;
2959 }
2960
2961 static void bond_info_seq_stop(struct seq_file *seq, void *v)
2962 {
2963         struct bonding *bond = seq->private;
2964
2965         read_unlock_bh(&bond->lock);
2966         read_unlock(&dev_base_lock);
2967 }
2968
2969 static void bond_info_show_master(struct seq_file *seq)
2970 {
2971         struct bonding *bond = seq->private;
2972         struct slave *curr;
2973         int i;
2974         u32 target;
2975
2976         read_lock(&bond->curr_slave_lock);
2977         curr = bond->curr_active_slave;
2978         read_unlock(&bond->curr_slave_lock);
2979
2980         seq_printf(seq, "Bonding Mode: %s\n",
2981                    bond_mode_name(bond->params.mode));
2982
2983         if (bond->params.mode == BOND_MODE_XOR ||
2984                 bond->params.mode == BOND_MODE_8023AD) {
2985                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2986                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2987                         bond->params.xmit_policy);
2988         }
2989
2990         if (USES_PRIMARY(bond->params.mode)) {
2991                 seq_printf(seq, "Primary Slave: %s\n",
2992                            (bond->primary_slave) ?
2993                            bond->primary_slave->dev->name : "None");
2994
2995                 seq_printf(seq, "Currently Active Slave: %s\n",
2996                            (curr) ? curr->dev->name : "None");
2997         }
2998
2999         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3000                    "up" : "down");
3001         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3002         seq_printf(seq, "Up Delay (ms): %d\n",
3003                    bond->params.updelay * bond->params.miimon);
3004         seq_printf(seq, "Down Delay (ms): %d\n",
3005                    bond->params.downdelay * bond->params.miimon);
3006
3007
3008         /* ARP information */
3009         if(bond->params.arp_interval > 0) {
3010                 int printed=0;
3011                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3012                                 bond->params.arp_interval);
3013
3014                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3015
3016                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3017                         if (!bond->params.arp_targets[i])
3018                                 continue;
3019                         if (printed)
3020                                 seq_printf(seq, ",");
3021                         target = ntohl(bond->params.arp_targets[i]);
3022                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
3023                         printed = 1;
3024                 }
3025                 seq_printf(seq, "\n");
3026         }
3027
3028         if (bond->params.mode == BOND_MODE_8023AD) {
3029                 struct ad_info ad_info;
3030
3031                 seq_puts(seq, "\n802.3ad info\n");
3032                 seq_printf(seq, "LACP rate: %s\n",
3033                            (bond->params.lacp_fast) ? "fast" : "slow");
3034
3035                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3036                         seq_printf(seq, "bond %s has no active aggregator\n",
3037                                    bond->dev->name);
3038                 } else {
3039                         seq_printf(seq, "Active Aggregator Info:\n");
3040
3041                         seq_printf(seq, "\tAggregator ID: %d\n",
3042                                    ad_info.aggregator_id);
3043                         seq_printf(seq, "\tNumber of ports: %d\n",
3044                                    ad_info.ports);
3045                         seq_printf(seq, "\tActor Key: %d\n",
3046                                    ad_info.actor_key);
3047                         seq_printf(seq, "\tPartner Key: %d\n",
3048                                    ad_info.partner_key);
3049                         seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
3050                                    ad_info.partner_system[0],
3051                                    ad_info.partner_system[1],
3052                                    ad_info.partner_system[2],
3053                                    ad_info.partner_system[3],
3054                                    ad_info.partner_system[4],
3055                                    ad_info.partner_system[5]);
3056                 }
3057         }
3058 }
3059
3060 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3061 {
3062         struct bonding *bond = seq->private;
3063
3064         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3065         seq_printf(seq, "MII Status: %s\n",
3066                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3067         seq_printf(seq, "Link Failure Count: %u\n",
3068                    slave->link_failure_count);
3069
3070         seq_printf(seq,
3071                    "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
3072                    slave->perm_hwaddr[0], slave->perm_hwaddr[1],
3073                    slave->perm_hwaddr[2], slave->perm_hwaddr[3],
3074                    slave->perm_hwaddr[4], slave->perm_hwaddr[5]);
3075
3076         if (bond->params.mode == BOND_MODE_8023AD) {
3077                 const struct aggregator *agg
3078                         = SLAVE_AD_INFO(slave).port.aggregator;
3079
3080                 if (agg) {
3081                         seq_printf(seq, "Aggregator ID: %d\n",
3082                                    agg->aggregator_identifier);
3083                 } else {
3084                         seq_puts(seq, "Aggregator ID: N/A\n");
3085                 }
3086         }
3087 }
3088
3089 static int bond_info_seq_show(struct seq_file *seq, void *v)
3090 {
3091         if (v == SEQ_START_TOKEN) {
3092                 seq_printf(seq, "%s\n", version);
3093                 bond_info_show_master(seq);
3094         } else {
3095                 bond_info_show_slave(seq, v);
3096         }
3097
3098         return 0;
3099 }
3100
3101 static struct seq_operations bond_info_seq_ops = {
3102         .start = bond_info_seq_start,
3103         .next  = bond_info_seq_next,
3104         .stop  = bond_info_seq_stop,
3105         .show  = bond_info_seq_show,
3106 };
3107
3108 static int bond_info_open(struct inode *inode, struct file *file)
3109 {
3110         struct seq_file *seq;
3111         struct proc_dir_entry *proc;
3112         int res;
3113
3114         res = seq_open(file, &bond_info_seq_ops);
3115         if (!res) {
3116                 /* recover the pointer buried in proc_dir_entry data */
3117                 seq = file->private_data;
3118                 proc = PDE(inode);
3119                 seq->private = proc->data;
3120         }
3121
3122         return res;
3123 }
3124
3125 static struct file_operations bond_info_fops = {
3126         .owner   = THIS_MODULE,
3127         .open    = bond_info_open,
3128         .read    = seq_read,
3129         .llseek  = seq_lseek,
3130         .release = seq_release,
3131 };
3132
3133 static int bond_create_proc_entry(struct bonding *bond)
3134 {
3135         struct net_device *bond_dev = bond->dev;
3136
3137         if (bond_proc_dir) {
3138                 bond->proc_entry = create_proc_entry(bond_dev->name,
3139                                                      S_IRUGO,
3140                                                      bond_proc_dir);
3141                 if (bond->proc_entry == NULL) {
3142                         printk(KERN_WARNING DRV_NAME
3143                                ": Warning: Cannot create /proc/net/%s/%s\n",
3144                                DRV_NAME, bond_dev->name);
3145                 } else {
3146                         bond->proc_entry->data = bond;
3147                         bond->proc_entry->proc_fops = &bond_info_fops;
3148                         bond->proc_entry->owner = THIS_MODULE;
3149                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3150                 }
3151         }
3152
3153         return 0;
3154 }
3155
3156 static void bond_remove_proc_entry(struct bonding *bond)
3157 {
3158         if (bond_proc_dir && bond->proc_entry) {
3159                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3160                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3161                 bond->proc_entry = NULL;
3162         }
3163 }
3164
3165 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3166  * Caller must hold rtnl_lock.
3167  */
3168 static void bond_create_proc_dir(void)
3169 {
3170         int len = strlen(DRV_NAME);
3171
3172         for (bond_proc_dir = proc_net->subdir; bond_proc_dir;
3173              bond_proc_dir = bond_proc_dir->next) {
3174                 if ((bond_proc_dir->namelen == len) &&
3175                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3176                         break;
3177                 }
3178         }
3179
3180         if (!bond_proc_dir) {
3181                 bond_proc_dir = proc_mkdir(DRV_NAME, proc_net);
3182                 if (bond_proc_dir) {
3183                         bond_proc_dir->owner = THIS_MODULE;
3184                 } else {
3185                         printk(KERN_WARNING DRV_NAME
3186                                 ": Warning: cannot create /proc/net/%s\n",
3187                                 DRV_NAME);
3188                 }
3189         }
3190 }
3191
3192 /* Destroy the bonding directory under /proc/net, if empty.
3193  * Caller must hold rtnl_lock.
3194  */
3195 static void bond_destroy_proc_dir(void)
3196 {
3197         struct proc_dir_entry *de;
3198
3199         if (!bond_proc_dir) {
3200                 return;
3201         }
3202
3203         /* verify that the /proc dir is empty */
3204         for (de = bond_proc_dir->subdir; de; de = de->next) {
3205                 /* ignore . and .. */
3206                 if (*(de->name) != '.') {
3207                         break;
3208                 }
3209         }
3210
3211         if (de) {
3212                 if (bond_proc_dir->owner == THIS_MODULE) {
3213                         bond_proc_dir->owner = NULL;
3214                 }
3215         } else {
3216                 remove_proc_entry(DRV_NAME, proc_net);
3217                 bond_proc_dir = NULL;
3218         }
3219 }
3220 #endif /* CONFIG_PROC_FS */
3221
3222 /*-------------------------- netdev event handling --------------------------*/
3223
3224 /*
3225  * Change device name
3226  */
3227 static int bond_event_changename(struct bonding *bond)
3228 {
3229 #ifdef CONFIG_PROC_FS
3230         bond_remove_proc_entry(bond);
3231         bond_create_proc_entry(bond);
3232 #endif
3233         down_write(&(bonding_rwsem));
3234         bond_destroy_sysfs_entry(bond);
3235         bond_create_sysfs_entry(bond);
3236         up_write(&(bonding_rwsem));
3237         return NOTIFY_DONE;
3238 }
3239
3240 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3241 {
3242         struct bonding *event_bond = bond_dev->priv;
3243
3244         switch (event) {
3245         case NETDEV_CHANGENAME:
3246                 return bond_event_changename(event_bond);
3247         case NETDEV_UNREGISTER:
3248                 /*
3249                  * TODO: remove a bond from the list?
3250                  */
3251                 break;
3252         default:
3253                 break;
3254         }
3255
3256         return NOTIFY_DONE;
3257 }
3258
3259 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3260 {
3261         struct net_device *bond_dev = slave_dev->master;
3262         struct bonding *bond = bond_dev->priv;
3263
3264         switch (event) {
3265         case NETDEV_UNREGISTER:
3266                 if (bond_dev) {
3267                         bond_release(bond_dev, slave_dev);
3268                 }
3269                 break;
3270         case NETDEV_CHANGE:
3271                 /*
3272                  * TODO: is this what we get if somebody
3273                  * sets up a hierarchical bond, then rmmod's
3274                  * one of the slave bonding devices?
3275                  */
3276                 break;
3277         case NETDEV_DOWN:
3278                 /*
3279                  * ... Or is it this?
3280                  */
3281                 break;
3282         case NETDEV_CHANGEMTU:
3283                 /*
3284                  * TODO: Should slaves be allowed to
3285                  * independently alter their MTU?  For
3286                  * an active-backup bond, slaves need
3287                  * not be the same type of device, so
3288                  * MTUs may vary.  For other modes,
3289                  * slaves arguably should have the
3290                  * same MTUs. To do this, we'd need to
3291                  * take over the slave's change_mtu
3292                  * function for the duration of their
3293                  * servitude.
3294                  */
3295                 break;
3296         case NETDEV_CHANGENAME:
3297                 /*
3298                  * TODO: handle changing the primary's name
3299                  */
3300                 break;
3301         case NETDEV_FEAT_CHANGE:
3302                 bond_compute_features(bond);
3303                 break;
3304         default:
3305                 break;
3306         }
3307
3308         return NOTIFY_DONE;
3309 }
3310
3311 /*
3312  * bond_netdev_event: handle netdev notifier chain events.
3313  *
3314  * This function receives events for the netdev chain.  The caller (an
3315  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3316  * locks for us to safely manipulate the slave devices (RTNL lock,
3317  * dev_probe_lock).
3318  */
3319 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3320 {
3321         struct net_device *event_dev = (struct net_device *)ptr;
3322
3323         dprintk("event_dev: %s, event: %lx\n",
3324                 (event_dev ? event_dev->name : "None"),
3325                 event);
3326
3327         if (!(event_dev->priv_flags & IFF_BONDING))
3328                 return NOTIFY_DONE;
3329
3330         if (event_dev->flags & IFF_MASTER) {
3331                 dprintk("IFF_MASTER\n");
3332                 return bond_master_netdev_event(event, event_dev);
3333         }
3334
3335         if (event_dev->flags & IFF_SLAVE) {
3336                 dprintk("IFF_SLAVE\n");
3337                 return bond_slave_netdev_event(event, event_dev);
3338         }
3339
3340         return NOTIFY_DONE;
3341 }
3342
3343 /*
3344  * bond_inetaddr_event: handle inetaddr notifier chain events.
3345  *
3346  * We keep track of device IPs primarily to use as source addresses in
3347  * ARP monitor probes (rather than spewing out broadcasts all the time).
3348  *
3349  * We track one IP for the main device (if it has one), plus one per VLAN.
3350  */
3351 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3352 {
3353         struct in_ifaddr *ifa = ptr;
3354         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3355         struct bonding *bond, *bond_next;
3356         struct vlan_entry *vlan, *vlan_next;
3357
3358         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3359                 if (bond->dev == event_dev) {
3360                         switch (event) {
3361                         case NETDEV_UP:
3362                                 bond->master_ip = ifa->ifa_local;
3363                                 return NOTIFY_OK;
3364                         case NETDEV_DOWN:
3365                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3366                                 return NOTIFY_OK;
3367                         default:
3368                                 return NOTIFY_DONE;
3369                         }
3370                 }
3371
3372                 if (list_empty(&bond->vlan_list))
3373                         continue;
3374
3375                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3376                                          vlan_list) {
3377                         vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
3378                         if (vlan_dev == event_dev) {
3379                                 switch (event) {
3380                                 case NETDEV_UP:
3381                                         vlan->vlan_ip = ifa->ifa_local;
3382                                         return NOTIFY_OK;
3383                                 case NETDEV_DOWN:
3384                                         vlan->vlan_ip =
3385                                                 bond_glean_dev_ip(vlan_dev);
3386                                         return NOTIFY_OK;
3387                                 default:
3388                                         return NOTIFY_DONE;
3389                                 }
3390                         }
3391                 }
3392         }
3393         return NOTIFY_DONE;
3394 }
3395
3396 static struct notifier_block bond_netdev_notifier = {
3397         .notifier_call = bond_netdev_event,
3398 };
3399
3400 static struct notifier_block bond_inetaddr_notifier = {
3401         .notifier_call = bond_inetaddr_event,
3402 };
3403
3404 /*-------------------------- Packet type handling ---------------------------*/
3405
3406 /* register to receive lacpdus on a bond */
3407 static void bond_register_lacpdu(struct bonding *bond)
3408 {
3409         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3410
3411         /* initialize packet type */
3412         pk_type->type = PKT_TYPE_LACPDU;
3413         pk_type->dev = bond->dev;
3414         pk_type->func = bond_3ad_lacpdu_recv;
3415
3416         dev_add_pack(pk_type);
3417 }
3418
3419 /* unregister to receive lacpdus on a bond */
3420 static void bond_unregister_lacpdu(struct bonding *bond)
3421 {
3422         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3423 }
3424
3425 void bond_register_arp(struct bonding *bond)
3426 {
3427         struct packet_type *pt = &bond->arp_mon_pt;
3428
3429         pt->type = htons(ETH_P_ARP);
3430         pt->dev = NULL; /*bond->dev;XXX*/
3431         pt->func = bond_arp_rcv;
3432         dev_add_pack(pt);
3433 }
3434
3435 void bond_unregister_arp(struct bonding *bond)
3436 {
3437         dev_remove_pack(&bond->arp_mon_pt);
3438 }
3439
3440 /*---------------------------- Hashing Policies -----------------------------*/
3441
3442 /*
3443  * Hash for the the output device based upon layer 3 and layer 4 data. If
3444  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3445  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3446  */
3447 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3448                                     struct net_device *bond_dev, int count)
3449 {
3450         struct ethhdr *data = (struct ethhdr *)skb->data;
3451         struct iphdr *iph = skb->nh.iph;
3452         u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
3453         int layer4_xor = 0;
3454
3455         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3456                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3457                     (iph->protocol == IPPROTO_TCP ||
3458                      iph->protocol == IPPROTO_UDP)) {
3459                         layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
3460                 }
3461                 return (layer4_xor ^
3462                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3463
3464         }
3465
3466         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3467 }
3468
3469 /*
3470  * Hash for the output device based upon layer 2 data
3471  */
3472 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3473                                    struct net_device *bond_dev, int count)
3474 {
3475         struct ethhdr *data = (struct ethhdr *)skb->data;
3476
3477         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3478 }
3479
3480 /*-------------------------- Device entry points ----------------------------*/
3481
3482 static int bond_open(struct net_device *bond_dev)
3483 {
3484         struct bonding *bond = bond_dev->priv;
3485         struct timer_list *mii_timer = &bond->mii_timer;
3486         struct timer_list *arp_timer = &bond->arp_timer;
3487
3488         bond->kill_timers = 0;
3489
3490         if ((bond->params.mode == BOND_MODE_TLB) ||
3491             (bond->params.mode == BOND_MODE_ALB)) {
3492                 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3493
3494                 /* bond_alb_initialize must be called before the timer
3495                  * is started.
3496                  */
3497                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3498                         /* something went wrong - fail the open operation */
3499                         return -1;
3500                 }
3501
3502                 init_timer(alb_timer);
3503                 alb_timer->expires  = jiffies + 1;
3504                 alb_timer->data     = (unsigned long)bond;
3505                 alb_timer->function = (void *)&bond_alb_monitor;
3506                 add_timer(alb_timer);
3507         }
3508
3509         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3510                 init_timer(mii_timer);
3511                 mii_timer->expires  = jiffies + 1;
3512                 mii_timer->data     = (unsigned long)bond_dev;
3513                 mii_timer->function = (void *)&bond_mii_monitor;
3514                 add_timer(mii_timer);
3515         }
3516
3517         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3518                 init_timer(arp_timer);
3519                 arp_timer->expires  = jiffies + 1;
3520                 arp_timer->data     = (unsigned long)bond_dev;
3521                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3522                         arp_timer->function = (void *)&bond_activebackup_arp_mon;
3523                 } else {
3524                         arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3525                 }
3526                 if (bond->params.arp_validate)
3527                         bond_register_arp(bond);
3528
3529                 add_timer(arp_timer);
3530         }
3531
3532         if (bond->params.mode == BOND_MODE_8023AD) {
3533                 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3534                 init_timer(ad_timer);
3535                 ad_timer->expires  = jiffies + 1;
3536                 ad_timer->data     = (unsigned long)bond;
3537                 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3538                 add_timer(ad_timer);
3539
3540                 /* register to receive LACPDUs */
3541                 bond_register_lacpdu(bond);
3542         }
3543
3544         return 0;
3545 }
3546
3547 static int bond_close(struct net_device *bond_dev)
3548 {
3549         struct bonding *bond = bond_dev->priv;
3550
3551         if (bond->params.mode == BOND_MODE_8023AD) {
3552                 /* Unregister the receive of LACPDUs */
3553                 bond_unregister_lacpdu(bond);
3554         }
3555
3556         if (bond->params.arp_validate)
3557                 bond_unregister_arp(bond);
3558
3559         write_lock_bh(&bond->lock);
3560
3561
3562         /* signal timers not to re-arm */
3563         bond->kill_timers = 1;
3564
3565         write_unlock_bh(&bond->lock);
3566
3567         /* del_timer_sync must run without holding the bond->lock
3568          * because a running timer might be trying to hold it too
3569          */
3570
3571         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3572                 del_timer_sync(&bond->mii_timer);
3573         }
3574
3575         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3576                 del_timer_sync(&bond->arp_timer);
3577         }
3578
3579         switch (bond->params.mode) {
3580         case BOND_MODE_8023AD:
3581                 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3582                 break;
3583         case BOND_MODE_TLB:
3584         case BOND_MODE_ALB:
3585                 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3586                 break;
3587         default:
3588                 break;
3589         }
3590
3591
3592         if ((bond->params.mode == BOND_MODE_TLB) ||
3593             (bond->params.mode == BOND_MODE_ALB)) {
3594                 /* Must be called only after all
3595                  * slaves have been released
3596                  */
3597                 bond_alb_deinitialize(bond);
3598         }
3599
3600         return 0;
3601 }
3602
3603 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3604 {
3605         struct bonding *bond = bond_dev->priv;
3606         struct net_device_stats *stats = &(bond->stats), *sstats;
3607         struct slave *slave;
3608         int i;
3609
3610         memset(stats, 0, sizeof(struct net_device_stats));
3611
3612         read_lock_bh(&bond->lock);
3613
3614         bond_for_each_slave(bond, slave, i) {
3615                 if (slave->dev->get_stats) {
3616                         sstats = slave->dev->get_stats(slave->dev);
3617
3618                         stats->rx_packets += sstats->rx_packets;
3619                         stats->rx_bytes += sstats->rx_bytes;
3620                         stats->rx_errors += sstats->rx_errors;
3621                         stats->rx_dropped += sstats->rx_dropped;
3622
3623                         stats->tx_packets += sstats->tx_packets;
3624                         stats->tx_bytes += sstats->tx_bytes;
3625                         stats->tx_errors += sstats->tx_errors;
3626                         stats->tx_dropped += sstats->tx_dropped;
3627
3628                         stats->multicast += sstats->multicast;
3629                         stats->collisions += sstats->collisions;
3630
3631                         stats->rx_length_errors += sstats->rx_length_errors;
3632                         stats->rx_over_errors += sstats->rx_over_errors;
3633                         stats->rx_crc_errors += sstats->rx_crc_errors;
3634                         stats->rx_frame_errors += sstats->rx_frame_errors;
3635                         stats->rx_fifo_errors += sstats->rx_fifo_errors;
3636                         stats->rx_missed_errors += sstats->rx_missed_errors;
3637
3638                         stats->tx_aborted_errors += sstats->tx_aborted_errors;
3639                         stats->tx_carrier_errors += sstats->tx_carrier_errors;
3640                         stats->tx_fifo_errors += sstats->tx_fifo_errors;
3641                         stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3642                         stats->tx_window_errors += sstats->tx_window_errors;
3643                 }
3644         }
3645
3646         read_unlock_bh(&bond->lock);
3647
3648         return stats;
3649 }
3650
3651 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3652 {
3653         struct net_device *slave_dev = NULL;
3654         struct ifbond k_binfo;
3655         struct ifbond __user *u_binfo = NULL;
3656         struct ifslave k_sinfo;
3657         struct ifslave __user *u_sinfo = NULL;
3658         struct mii_ioctl_data *mii = NULL;
3659         int res = 0;
3660
3661         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3662                 bond_dev->name, cmd);
3663
3664         switch (cmd) {
3665         case SIOCGMIIPHY:
3666                 mii = if_mii(ifr);
3667                 if (!mii) {
3668                         return -EINVAL;
3669                 }
3670                 mii->phy_id = 0;
3671                 /* Fall Through */
3672         case SIOCGMIIREG:
3673                 /*
3674                  * We do this again just in case we were called by SIOCGMIIREG
3675                  * instead of SIOCGMIIPHY.
3676                  */
3677                 mii = if_mii(ifr);
3678                 if (!mii) {
3679                         return -EINVAL;
3680                 }
3681
3682                 if (mii->reg_num == 1) {
3683                         struct bonding *bond = bond_dev->priv;
3684                         mii->val_out = 0;
3685                         read_lock_bh(&bond->lock);
3686                         read_lock(&bond->curr_slave_lock);
3687                         if (netif_carrier_ok(bond->dev)) {
3688                                 mii->val_out = BMSR_LSTATUS;
3689                         }
3690                         read_unlock(&bond->curr_slave_lock);
3691                         read_unlock_bh(&bond->lock);
3692                 }
3693
3694                 return 0;
3695         case BOND_INFO_QUERY_OLD:
3696         case SIOCBONDINFOQUERY:
3697                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3698
3699                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3700                         return -EFAULT;
3701                 }
3702
3703                 res = bond_info_query(bond_dev, &k_binfo);
3704                 if (res == 0) {
3705                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3706                                 return -EFAULT;
3707                         }
3708                 }
3709
3710                 return res;
3711         case BOND_SLAVE_INFO_QUERY_OLD:
3712         case SIOCBONDSLAVEINFOQUERY:
3713                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3714
3715                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3716                         return -EFAULT;
3717                 }
3718
3719                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3720                 if (res == 0) {
3721                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3722                                 return -EFAULT;
3723                         }
3724                 }
3725
3726                 return res;
3727         default:
3728                 /* Go on */
3729                 break;
3730         }
3731
3732         if (!capable(CAP_NET_ADMIN)) {
3733                 return -EPERM;
3734         }
3735
3736         down_write(&(bonding_rwsem));
3737         slave_dev = dev_get_by_name(ifr->ifr_slave);
3738
3739         dprintk("slave_dev=%p: \n", slave_dev);
3740
3741         if (!slave_dev) {
3742                 res = -ENODEV;
3743         } else {
3744                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3745                 switch (cmd) {
3746                 case BOND_ENSLAVE_OLD:
3747                 case SIOCBONDENSLAVE:
3748                         res = bond_enslave(bond_dev, slave_dev);
3749                         break;
3750                 case BOND_RELEASE_OLD:
3751                 case SIOCBONDRELEASE:
3752                         res = bond_release(bond_dev, slave_dev);
3753                         break;
3754                 case BOND_SETHWADDR_OLD:
3755                 case SIOCBONDSETHWADDR:
3756                         res = bond_sethwaddr(bond_dev, slave_dev);
3757                         break;
3758                 case BOND_CHANGE_ACTIVE_OLD:
3759                 case SIOCBONDCHANGEACTIVE:
3760                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3761                         break;
3762                 default:
3763                         res = -EOPNOTSUPP;
3764                 }
3765
3766                 dev_put(slave_dev);
3767         }
3768
3769         up_write(&(bonding_rwsem));
3770         return res;
3771 }
3772
3773 static void bond_set_multicast_list(struct net_device *bond_dev)
3774 {
3775         struct bonding *bond = bond_dev->priv;
3776         struct dev_mc_list *dmi;
3777
3778         write_lock_bh(&bond->lock);
3779
3780         /*
3781          * Do promisc before checking multicast_mode
3782          */
3783         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3784                 bond_set_promiscuity(bond, 1);
3785         }
3786
3787         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3788                 bond_set_promiscuity(bond, -1);
3789         }
3790
3791         /* set allmulti flag to slaves */
3792         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3793                 bond_set_allmulti(bond, 1);
3794         }
3795
3796         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3797                 bond_set_allmulti(bond, -1);
3798         }
3799
3800         bond->flags = bond_dev->flags;
3801
3802         /* looking for addresses to add to slaves' mc list */
3803         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3804                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3805                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3806                 }
3807         }
3808
3809         /* looking for addresses to delete from slaves' list */
3810         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3811                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3812                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3813                 }
3814         }
3815
3816         /* save master's multicast list */
3817         bond_mc_list_destroy(bond);
3818         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3819
3820         write_unlock_bh(&bond->lock);
3821 }
3822
3823 /*
3824  * Change the MTU of all of a master's slaves to match the master
3825  */
3826 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3827 {
3828         struct bonding *bond = bond_dev->priv;
3829         struct slave *slave, *stop_at;
3830         int res = 0;
3831         int i;
3832
3833         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3834                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3835
3836         /* Can't hold bond->lock with bh disabled here since
3837          * some base drivers panic. On the other hand we can't
3838          * hold bond->lock without bh disabled because we'll
3839          * deadlock. The only solution is to rely on the fact
3840          * that we're under rtnl_lock here, and the slaves
3841          * list won't change. This doesn't solve the problem
3842          * of setting the slave's MTU while it is
3843          * transmitting, but the assumption is that the base
3844          * driver can handle that.
3845          *
3846          * TODO: figure out a way to safely iterate the slaves
3847          * list, but without holding a lock around the actual
3848          * call to the base driver.
3849          */
3850
3851         bond_for_each_slave(bond, slave, i) {
3852                 dprintk("s %p s->p %p c_m %p\n", slave,
3853                         slave->prev, slave->dev->change_mtu);
3854
3855                 res = dev_set_mtu(slave->dev, new_mtu);
3856
3857                 if (res) {
3858                         /* If we failed to set the slave's mtu to the new value
3859                          * we must abort the operation even in ACTIVE_BACKUP
3860                          * mode, because if we allow the backup slaves to have
3861                          * different mtu values than the active slave we'll
3862                          * need to change their mtu when doing a failover. That
3863                          * means changing their mtu from timer context, which
3864                          * is probably not a good idea.
3865                          */
3866                         dprintk("err %d %s\n", res, slave->dev->name);
3867                         goto unwind;
3868                 }
3869         }
3870
3871         bond_dev->mtu = new_mtu;
3872
3873         return 0;
3874
3875 unwind:
3876         /* unwind from head to the slave that failed */
3877         stop_at = slave;
3878         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3879                 int tmp_res;
3880
3881                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3882                 if (tmp_res) {
3883                         dprintk("unwind err %d dev %s\n", tmp_res,
3884                                 slave->dev->name);
3885                 }
3886         }
3887
3888         return res;
3889 }
3890
3891 /*
3892  * Change HW address
3893  *
3894  * Note that many devices must be down to change the HW address, and
3895  * downing the master releases all slaves.  We can make bonds full of
3896  * bonding devices to test this, however.
3897  */
3898 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3899 {
3900         struct bonding *bond = bond_dev->priv;
3901         struct sockaddr *sa = addr, tmp_sa;
3902         struct slave *slave, *stop_at;
3903         int res = 0;
3904         int i;
3905
3906         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3907
3908         if (!is_valid_ether_addr(sa->sa_data)) {
3909                 return -EADDRNOTAVAIL;
3910         }
3911
3912         /* Can't hold bond->lock with bh disabled here since
3913          * some base drivers panic. On the other hand we can't
3914          * hold bond->lock without bh disabled because we'll
3915          * deadlock. The only solution is to rely on the fact
3916          * that we're under rtnl_lock here, and the slaves
3917          * list won't change. This doesn't solve the problem
3918          * of setting the slave's hw address while it is
3919          * transmitting, but the assumption is that the base
3920          * driver can handle that.
3921          *
3922          * TODO: figure out a way to safely iterate the slaves
3923          * list, but without holding a lock around the actual
3924          * call to the base driver.
3925          */
3926
3927         bond_for_each_slave(bond, slave, i) {
3928                 dprintk("slave %p %s\n", slave, slave->dev->name);
3929
3930                 if (slave->dev->set_mac_address == NULL) {
3931                         res = -EOPNOTSUPP;
3932                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3933                         goto unwind;
3934                 }
3935
3936                 res = dev_set_mac_address(slave->dev, addr);
3937                 if (res) {
3938                         /* TODO: consider downing the slave
3939                          * and retry ?
3940                          * User should expect communications
3941                          * breakage anyway until ARP finish
3942                          * updating, so...
3943                          */
3944                         dprintk("err %d %s\n", res, slave->dev->name);
3945                         goto unwind;
3946                 }
3947         }
3948
3949         /* success */
3950         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3951         return 0;
3952
3953 unwind:
3954         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3955         tmp_sa.sa_family = bond_dev->type;
3956
3957         /* unwind from head to the slave that failed */
3958         stop_at = slave;
3959         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3960                 int tmp_res;
3961
3962                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3963                 if (tmp_res) {
3964                         dprintk("unwind err %d dev %s\n", tmp_res,
3965                                 slave->dev->name);
3966                 }
3967         }
3968
3969         return res;
3970 }
3971
3972 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3973 {
3974         struct bonding *bond = bond_dev->priv;
3975         struct slave *slave, *start_at;
3976         int i;
3977         int res = 1;
3978
3979         read_lock(&bond->lock);
3980
3981         if (!BOND_IS_OK(bond)) {
3982                 goto out;
3983         }
3984
3985         read_lock(&bond->curr_slave_lock);
3986         slave = start_at = bond->curr_active_slave;
3987         read_unlock(&bond->curr_slave_lock);
3988
3989         if (!slave) {
3990                 goto out;
3991         }
3992
3993         bond_for_each_slave_from(bond, slave, i, start_at) {
3994                 if (IS_UP(slave->dev) &&
3995                     (slave->link == BOND_LINK_UP) &&
3996                     (slave->state == BOND_STATE_ACTIVE)) {
3997                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3998
3999                         write_lock(&bond->curr_slave_lock);
4000                         bond->curr_active_slave = slave->next;
4001                         write_unlock(&bond->curr_slave_lock);
4002
4003                         break;
4004                 }
4005         }
4006
4007
4008 out:
4009         if (res) {
4010                 /* no suitable interface, frame not sent */
4011                 dev_kfree_skb(skb);
4012         }
4013         read_unlock(&bond->lock);
4014         return 0;
4015 }
4016
4017 static void bond_activebackup_xmit_copy(struct sk_buff *skb,
4018                                         struct bonding *bond,
4019                                         struct slave *slave)
4020 {
4021         struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
4022         struct ethhdr *eth_data;
4023         u8 *hwaddr;
4024         int res;
4025
4026         if (!skb2) {
4027                 printk(KERN_ERR DRV_NAME ": Error: "
4028                        "bond_activebackup_xmit_copy(): skb_copy() failed\n");
4029                 return;
4030         }
4031
4032         skb2->mac.raw = (unsigned char *)skb2->data;
4033         eth_data = eth_hdr(skb2);
4034
4035         /* Pick an appropriate source MAC address
4036          *      -- use slave's perm MAC addr, unless used by bond
4037          *      -- otherwise, borrow active slave's perm MAC addr
4038          *         since that will not be used
4039          */
4040         hwaddr = slave->perm_hwaddr;
4041         if (!memcmp(eth_data->h_source, hwaddr, ETH_ALEN))
4042                 hwaddr = bond->curr_active_slave->perm_hwaddr;
4043
4044         /* Set source MAC address appropriately */
4045         memcpy(eth_data->h_source, hwaddr, ETH_ALEN);
4046
4047         res = bond_dev_queue_xmit(bond, skb2, slave->dev);
4048         if (res)
4049                 dev_kfree_skb(skb2);
4050
4051         return;
4052 }
4053
4054 /*
4055  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4056  * the bond has a usable interface.
4057  */
4058 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4059 {
4060         struct bonding *bond = bond_dev->priv;
4061         int res = 1;
4062
4063         read_lock(&bond->lock);
4064         read_lock(&bond->curr_slave_lock);
4065
4066         if (!BOND_IS_OK(bond)) {
4067                 goto out;
4068         }
4069
4070         if (!bond->curr_active_slave)
4071                 goto out;
4072
4073         /* Xmit IGMP frames on all slaves to ensure rapid fail-over
4074            for multicast traffic on snooping switches */
4075         if (skb->protocol == __constant_htons(ETH_P_IP) &&
4076             skb->nh.iph->protocol == IPPROTO_IGMP) {
4077                 struct slave *slave, *active_slave;
4078                 int i;
4079
4080                 active_slave = bond->curr_active_slave;
4081                 bond_for_each_slave_from_to(bond, slave, i, active_slave->next,
4082                                             active_slave->prev)
4083                         if (IS_UP(slave->dev) &&
4084                             (slave->link == BOND_LINK_UP))
4085                                 bond_activebackup_xmit_copy(skb, bond, slave);
4086         }
4087
4088         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4089
4090 out:
4091         if (res) {
4092                 /* no suitable interface, frame not sent */
4093                 dev_kfree_skb(skb);
4094         }
4095         read_unlock(&bond->curr_slave_lock);
4096         read_unlock(&bond->lock);
4097         return 0;
4098 }
4099
4100 /*
4101  * In bond_xmit_xor() , we determine the output device by using a pre-
4102  * determined xmit_hash_policy(), If the selected device is not enabled,
4103  * find the next active slave.
4104  */
4105 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4106 {
4107         struct bonding *bond = bond_dev->priv;
4108         struct slave *slave, *start_at;
4109         int slave_no;
4110         int i;
4111         int res = 1;
4112
4113         read_lock(&bond->lock);
4114
4115         if (!BOND_IS_OK(bond)) {
4116                 goto out;
4117         }
4118
4119         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4120
4121         bond_for_each_slave(bond, slave, i) {
4122                 slave_no--;
4123                 if (slave_no < 0) {
4124                         break;
4125                 }
4126         }
4127
4128         start_at = slave;
4129
4130         bond_for_each_slave_from(bond, slave, i, start_at) {
4131                 if (IS_UP(slave->dev) &&
4132                     (slave->link == BOND_LINK_UP) &&
4133                     (slave->state == BOND_STATE_ACTIVE)) {
4134                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4135                         break;
4136                 }
4137         }
4138
4139 out:
4140         if (res) {
4141                 /* no suitable interface, frame not sent */
4142                 dev_kfree_skb(skb);
4143         }
4144         read_unlock(&bond->lock);
4145         return 0;
4146 }
4147
4148 /*
4149  * in broadcast mode, we send everything to all usable interfaces.
4150  */
4151 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4152 {
4153         struct bonding *bond = bond_dev->priv;
4154         struct slave *slave, *start_at;
4155         struct net_device *tx_dev = NULL;
4156         int i;
4157         int res = 1;
4158
4159         read_lock(&bond->lock);
4160
4161         if (!BOND_IS_OK(bond)) {
4162                 goto out;
4163         }
4164
4165         read_lock(&bond->curr_slave_lock);
4166         start_at = bond->curr_active_slave;
4167         read_unlock(&bond->curr_slave_lock);
4168
4169         if (!start_at) {
4170                 goto out;
4171         }
4172
4173         bond_for_each_slave_from(bond, slave, i, start_at) {
4174                 if (IS_UP(slave->dev) &&
4175                     (slave->link == BOND_LINK_UP) &&
4176                     (slave->state == BOND_STATE_ACTIVE)) {
4177                         if (tx_dev) {
4178                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4179                                 if (!skb2) {
4180                                         printk(KERN_ERR DRV_NAME
4181                                                ": %s: Error: bond_xmit_broadcast(): "
4182                                                "skb_clone() failed\n",
4183                                                bond_dev->name);
4184                                         continue;
4185                                 }
4186
4187                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4188                                 if (res) {
4189                                         dev_kfree_skb(skb2);
4190                                         continue;
4191                                 }
4192                         }
4193                         tx_dev = slave->dev;
4194                 }
4195         }
4196
4197         if (tx_dev) {
4198                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4199         }
4200
4201 out:
4202         if (res) {
4203                 /* no suitable interface, frame not sent */
4204                 dev_kfree_skb(skb);
4205         }
4206         /* frame sent to all suitable interfaces */
4207         read_unlock(&bond->lock);
4208         return 0;
4209 }
4210
4211 /*------------------------- Device initialization ---------------------------*/
4212
4213 /*
4214  * set bond mode specific net device operations
4215  */
4216 void bond_set_mode_ops(struct bonding *bond, int mode)
4217 {
4218         struct net_device *bond_dev = bond->dev;
4219
4220         switch (mode) {
4221         case BOND_MODE_ROUNDROBIN:
4222                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4223                 break;
4224         case BOND_MODE_ACTIVEBACKUP:
4225                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4226                 break;
4227         case BOND_MODE_XOR:
4228                 bond_dev->hard_start_xmit = bond_xmit_xor;
4229                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4230                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4231                 else
4232                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4233                 break;
4234         case BOND_MODE_BROADCAST:
4235                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4236                 break;
4237         case BOND_MODE_8023AD:
4238                 bond_set_master_3ad_flags(bond);
4239                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4240                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4241                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4242                 else
4243                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4244                 break;
4245         case BOND_MODE_ALB:
4246                 bond_set_master_alb_flags(bond);
4247                 /* FALLTHRU */
4248         case BOND_MODE_TLB:
4249                 bond_dev->hard_start_xmit = bond_alb_xmit;
4250                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4251                 break;
4252         default:
4253                 /* Should never happen, mode already checked */
4254                 printk(KERN_ERR DRV_NAME
4255                        ": %s: Error: Unknown bonding mode %d\n",
4256                        bond_dev->name,
4257                        mode);
4258                 break;
4259         }
4260 }
4261
4262 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4263                                     struct ethtool_drvinfo *drvinfo)
4264 {
4265         strncpy(drvinfo->driver, DRV_NAME, 32);
4266         strncpy(drvinfo->version, DRV_VERSION, 32);
4267         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4268 }
4269
4270 static const struct ethtool_ops bond_ethtool_ops = {
4271         .get_tx_csum            = ethtool_op_get_tx_csum,
4272         .get_tso                = ethtool_op_get_tso,
4273         .get_ufo                = ethtool_op_get_ufo,
4274         .get_sg                 = ethtool_op_get_sg,
4275         .get_drvinfo            = bond_ethtool_get_drvinfo,
4276 };
4277
4278 /*
4279  * Does not allocate but creates a /proc entry.
4280  * Allowed to fail.
4281  */
4282 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4283 {
4284         struct bonding *bond = bond_dev->priv;
4285
4286         dprintk("Begin bond_init for %s\n", bond_dev->name);
4287
4288         /* initialize rwlocks */
4289         rwlock_init(&bond->lock);
4290         rwlock_init(&bond->curr_slave_lock);
4291
4292         bond->params = *params; /* copy params struct */
4293
4294         /* Initialize pointers */
4295         bond->first_slave = NULL;
4296         bond->curr_active_slave = NULL;
4297         bond->current_arp_slave = NULL;
4298         bond->primary_slave = NULL;
4299         bond->dev = bond_dev;
4300         INIT_LIST_HEAD(&bond->vlan_list);
4301
4302         /* Initialize the device entry points */
4303         bond_dev->open = bond_open;
4304         bond_dev->stop = bond_close;
4305         bond_dev->get_stats = bond_get_stats;
4306         bond_dev->do_ioctl = bond_do_ioctl;
4307         bond_dev->ethtool_ops = &bond_ethtool_ops;
4308         bond_dev->set_multicast_list = bond_set_multicast_list;
4309         bond_dev->change_mtu = bond_change_mtu;
4310         bond_dev->set_mac_address = bond_set_mac_address;
4311
4312         bond_set_mode_ops(bond, bond->params.mode);
4313
4314         bond_dev->destructor = free_netdev;
4315
4316         /* Initialize the device options */
4317         bond_dev->tx_queue_len = 0;
4318         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4319         bond_dev->priv_flags |= IFF_BONDING;
4320
4321         /* At first, we block adding VLANs. That's the only way to
4322          * prevent problems that occur when adding VLANs over an
4323          * empty bond. The block will be removed once non-challenged
4324          * slaves are enslaved.
4325          */
4326         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4327
4328         /* don't acquire bond device's netif_tx_lock when
4329          * transmitting */
4330         bond_dev->features |= NETIF_F_LLTX;
4331
4332         /* By default, we declare the bond to be fully
4333          * VLAN hardware accelerated capable. Special
4334          * care is taken in the various xmit functions
4335          * when there are slaves that are not hw accel
4336          * capable
4337          */
4338         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4339         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4340         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4341         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4342                                NETIF_F_HW_VLAN_RX |
4343                                NETIF_F_HW_VLAN_FILTER);
4344
4345 #ifdef CONFIG_PROC_FS
4346         bond_create_proc_entry(bond);
4347 #endif
4348
4349         list_add_tail(&bond->bond_list, &bond_dev_list);
4350
4351         return 0;
4352 }
4353
4354 /* De-initialize device specific data.
4355  * Caller must hold rtnl_lock.
4356  */
4357 void bond_deinit(struct net_device *bond_dev)
4358 {
4359         struct bonding *bond = bond_dev->priv;
4360
4361         list_del(&bond->bond_list);
4362
4363 #ifdef CONFIG_PROC_FS
4364         bond_remove_proc_entry(bond);
4365 #endif
4366 }
4367
4368 /* Unregister and free all bond devices.
4369  * Caller must hold rtnl_lock.
4370  */
4371 static void bond_free_all(void)
4372 {
4373         struct bonding *bond, *nxt;
4374
4375         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4376                 struct net_device *bond_dev = bond->dev;
4377
4378                 bond_mc_list_destroy(bond);
4379                 /* Release the bonded slaves */
4380                 bond_release_all(bond_dev);
4381                 unregister_netdevice(bond_dev);
4382                 bond_deinit(bond_dev);
4383         }
4384
4385 #ifdef CONFIG_PROC_FS
4386         bond_destroy_proc_dir();
4387 #endif
4388 }
4389
4390 /*------------------------- Module initialization ---------------------------*/
4391
4392 /*
4393  * Convert string input module parms.  Accept either the
4394  * number of the mode or its string name.
4395  */
4396 int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
4397 {
4398         int i;
4399
4400         for (i = 0; tbl[i].modename; i++) {
4401                 if ((isdigit(*mode_arg) &&
4402                      tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4403                     (strncmp(mode_arg, tbl[i].modename,
4404                              strlen(tbl[i].modename)) == 0)) {
4405                         return tbl[i].mode;
4406                 }
4407         }
4408
4409         return -1;
4410 }
4411
4412 static int bond_check_params(struct bond_params *params)
4413 {
4414         int arp_validate_value;
4415
4416         /*
4417          * Convert string parameters.
4418          */
4419         if (mode) {
4420                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4421                 if (bond_mode == -1) {
4422                         printk(KERN_ERR DRV_NAME
4423                                ": Error: Invalid bonding mode \"%s\"\n",
4424                                mode == NULL ? "NULL" : mode);
4425                         return -EINVAL;
4426                 }
4427         }
4428
4429         if (xmit_hash_policy) {
4430                 if ((bond_mode != BOND_MODE_XOR) &&
4431                     (bond_mode != BOND_MODE_8023AD)) {
4432                         printk(KERN_INFO DRV_NAME
4433                                ": xor_mode param is irrelevant in mode %s\n",
4434                                bond_mode_name(bond_mode));
4435                 } else {
4436                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4437                                                         xmit_hashtype_tbl);
4438                         if (xmit_hashtype == -1) {
4439                                 printk(KERN_ERR DRV_NAME
4440                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4441                                 xmit_hash_policy == NULL ? "NULL" :
4442                                        xmit_hash_policy);
4443                                 return -EINVAL;
4444                         }
4445                 }
4446         }
4447
4448         if (lacp_rate) {
4449                 if (bond_mode != BOND_MODE_8023AD) {
4450                         printk(KERN_INFO DRV_NAME
4451                                ": lacp_rate param is irrelevant in mode %s\n",
4452                                bond_mode_name(bond_mode));
4453                 } else {
4454                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4455                         if (lacp_fast == -1) {
4456                                 printk(KERN_ERR DRV_NAME
4457                                        ": Error: Invalid lacp rate \"%s\"\n",
4458                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4459                                 return -EINVAL;
4460                         }
4461                 }
4462         }
4463
4464         if (max_bonds < 1 || max_bonds > INT_MAX) {
4465                 printk(KERN_WARNING DRV_NAME
4466                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4467                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4468                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4469                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4470         }
4471
4472         if (miimon < 0) {
4473                 printk(KERN_WARNING DRV_NAME
4474                        ": Warning: miimon module parameter (%d), "
4475                        "not in range 0-%d, so it was reset to %d\n",
4476                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4477                 miimon = BOND_LINK_MON_INTERV;
4478         }
4479
4480         if (updelay < 0) {
4481                 printk(KERN_WARNING DRV_NAME
4482                        ": Warning: updelay module parameter (%d), "
4483                        "not in range 0-%d, so it was reset to 0\n",
4484                        updelay, INT_MAX);
4485                 updelay = 0;
4486         }
4487
4488         if (downdelay < 0) {
4489                 printk(KERN_WARNING DRV_NAME
4490                        ": Warning: downdelay module parameter (%d), "
4491                        "not in range 0-%d, so it was reset to 0\n",
4492                        downdelay, INT_MAX);
4493                 downdelay = 0;
4494         }
4495
4496         if ((use_carrier != 0) && (use_carrier != 1)) {
4497                 printk(KERN_WARNING DRV_NAME
4498                        ": Warning: use_carrier module parameter (%d), "
4499                        "not of valid value (0/1), so it was set to 1\n",
4500                        use_carrier);
4501                 use_carrier = 1;
4502         }
4503
4504         /* reset values for 802.3ad */
4505         if (bond_mode == BOND_MODE_8023AD) {
4506                 if (!miimon) {
4507                         printk(KERN_WARNING DRV_NAME
4508                                ": Warning: miimon must be specified, "
4509                                "otherwise bonding will not detect link "
4510                                "failure, speed and duplex which are "
4511                                "essential for 802.3ad operation\n");
4512                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4513                         miimon = 100;
4514                 }
4515         }
4516
4517         /* reset values for TLB/ALB */
4518         if ((bond_mode == BOND_MODE_TLB) ||
4519             (bond_mode == BOND_MODE_ALB)) {
4520                 if (!miimon) {
4521                         printk(KERN_WARNING DRV_NAME
4522                                ": Warning: miimon must be specified, "
4523                                "otherwise bonding will not detect link "
4524                                "failure and link speed which are essential "
4525                                "for TLB/ALB load balancing\n");
4526                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4527                         miimon = 100;
4528                 }
4529         }
4530
4531         if (bond_mode == BOND_MODE_ALB) {
4532                 printk(KERN_NOTICE DRV_NAME
4533                        ": In ALB mode you might experience client "
4534                        "disconnections upon reconnection of a link if the "
4535                        "bonding module updelay parameter (%d msec) is "
4536                        "incompatible with the forwarding delay time of the "
4537                        "switch\n",
4538                        updelay);
4539         }
4540
4541         if (!miimon) {
4542                 if (updelay || downdelay) {
4543                         /* just warn the user the up/down delay will have
4544                          * no effect since miimon is zero...
4545                          */
4546                         printk(KERN_WARNING DRV_NAME
4547                                ": Warning: miimon module parameter not set "
4548                                "and updelay (%d) or downdelay (%d) module "
4549                                "parameter is set; updelay and downdelay have "
4550                                "no effect unless miimon is set\n",
4551                                updelay, downdelay);
4552                 }
4553         } else {
4554                 /* don't allow arp monitoring */
4555                 if (arp_interval) {
4556                         printk(KERN_WARNING DRV_NAME
4557                                ": Warning: miimon (%d) and arp_interval (%d) "
4558                                "can't be used simultaneously, disabling ARP "
4559                                "monitoring\n",
4560                                miimon, arp_interval);
4561                         arp_interval = 0;
4562                 }
4563
4564                 if ((updelay % miimon) != 0) {
4565                         printk(KERN_WARNING DRV_NAME
4566                                ": Warning: updelay (%d) is not a multiple "
4567                                "of miimon (%d), updelay rounded to %d ms\n",
4568                                updelay, miimon, (updelay / miimon) * miimon);
4569                 }
4570
4571                 updelay /= miimon;
4572
4573                 if ((downdelay % miimon) != 0) {
4574                         printk(KERN_WARNING DRV_NAME
4575                                ": Warning: downdelay (%d) is not a multiple "
4576                                "of miimon (%d), downdelay rounded to %d ms\n",
4577                                downdelay, miimon,
4578                                (downdelay / miimon) * miimon);
4579                 }
4580
4581                 downdelay /= miimon;
4582         }
4583
4584         if (arp_interval < 0) {
4585                 printk(KERN_WARNING DRV_NAME
4586                        ": Warning: arp_interval module parameter (%d) "
4587                        ", not in range 0-%d, so it was reset to %d\n",
4588                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4589                 arp_interval = BOND_LINK_ARP_INTERV;
4590         }
4591
4592         for (arp_ip_count = 0;
4593              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4594              arp_ip_count++) {
4595                 /* not complete check, but should be good enough to
4596                    catch mistakes */
4597                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4598                         printk(KERN_WARNING DRV_NAME
4599                                ": Warning: bad arp_ip_target module parameter "
4600                                "(%s), ARP monitoring will not be performed\n",
4601                                arp_ip_target[arp_ip_count]);
4602                         arp_interval = 0;
4603                 } else {
4604                         u32 ip = in_aton(arp_ip_target[arp_ip_count]);
4605                         arp_target[arp_ip_count] = ip;
4606                 }
4607         }
4608
4609         if (arp_interval && !arp_ip_count) {
4610                 /* don't allow arping if no arp_ip_target given... */
4611                 printk(KERN_WARNING DRV_NAME
4612                        ": Warning: arp_interval module parameter (%d) "
4613                        "specified without providing an arp_ip_target "
4614                        "parameter, arp_interval was reset to 0\n",
4615                        arp_interval);
4616                 arp_interval = 0;
4617         }
4618
4619         if (arp_validate) {
4620                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4621                         printk(KERN_ERR DRV_NAME
4622                ": arp_validate only supported in active-backup mode\n");
4623                         return -EINVAL;
4624                 }
4625                 if (!arp_interval) {
4626                         printk(KERN_ERR DRV_NAME
4627                                ": arp_validate requires arp_interval\n");
4628                         return -EINVAL;
4629                 }
4630
4631                 arp_validate_value = bond_parse_parm(arp_validate,
4632                                                      arp_validate_tbl);
4633                 if (arp_validate_value == -1) {
4634                         printk(KERN_ERR DRV_NAME
4635                                ": Error: invalid arp_validate \"%s\"\n",
4636                                arp_validate == NULL ? "NULL" : arp_validate);
4637                         return -EINVAL;
4638                 }
4639         } else
4640                 arp_validate_value = 0;
4641
4642         if (miimon) {
4643                 printk(KERN_INFO DRV_NAME
4644                        ": MII link monitoring set to %d ms\n",
4645                        miimon);
4646         } else if (arp_interval) {
4647                 int i;
4648
4649                 printk(KERN_INFO DRV_NAME
4650                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4651                        arp_interval,
4652                        arp_validate_tbl[arp_validate_value].modename,
4653                        arp_ip_count);
4654
4655                 for (i = 0; i < arp_ip_count; i++)
4656                         printk (" %s", arp_ip_target[i]);
4657
4658                 printk("\n");
4659
4660         } else {
4661                 /* miimon and arp_interval not set, we need one so things
4662                  * work as expected, see bonding.txt for details
4663                  */
4664                 printk(KERN_WARNING DRV_NAME
4665                        ": Warning: either miimon or arp_interval and "
4666                        "arp_ip_target module parameters must be specified, "
4667                        "otherwise bonding will not detect link failures! see "
4668                        "bonding.txt for details.\n");
4669         }
4670
4671         if (primary && !USES_PRIMARY(bond_mode)) {
4672                 /* currently, using a primary only makes sense
4673                  * in active backup, TLB or ALB modes
4674                  */
4675                 printk(KERN_WARNING DRV_NAME
4676                        ": Warning: %s primary device specified but has no "
4677                        "effect in %s mode\n",
4678                        primary, bond_mode_name(bond_mode));
4679                 primary = NULL;
4680         }
4681
4682         /* fill params struct with the proper values */
4683         params->mode = bond_mode;
4684         params->xmit_policy = xmit_hashtype;
4685         params->miimon = miimon;
4686         params->arp_interval = arp_interval;
4687         params->arp_validate = arp_validate_value;
4688         params->updelay = updelay;
4689         params->downdelay = downdelay;
4690         params->use_carrier = use_carrier;
4691         params->lacp_fast = lacp_fast;
4692         params->primary[0] = 0;
4693
4694         if (primary) {
4695                 strncpy(params->primary, primary, IFNAMSIZ);
4696                 params->primary[IFNAMSIZ - 1] = 0;
4697         }
4698
4699         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4700
4701         return 0;
4702 }
4703
4704 static struct lock_class_key bonding_netdev_xmit_lock_key;
4705
4706 /* Create a new bond based on the specified name and bonding parameters.
4707  * Caller must NOT hold rtnl_lock; we need to release it here before we
4708  * set up our sysfs entries.
4709  */
4710 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4711 {
4712         struct net_device *bond_dev;
4713         int res;
4714
4715         rtnl_lock();
4716         bond_dev = alloc_netdev(sizeof(struct bonding), name, ether_setup);
4717         if (!bond_dev) {
4718                 printk(KERN_ERR DRV_NAME
4719                        ": %s: eek! can't alloc netdev!\n",
4720                        name);
4721                 res = -ENOMEM;
4722                 goto out_rtnl;
4723         }
4724
4725         /* bond_init() must be called after dev_alloc_name() (for the
4726          * /proc files), but before register_netdevice(), because we
4727          * need to set function pointers.
4728          */
4729
4730         res = bond_init(bond_dev, params);
4731         if (res < 0) {
4732                 goto out_netdev;
4733         }
4734
4735         SET_MODULE_OWNER(bond_dev);
4736
4737         res = register_netdevice(bond_dev);
4738         if (res < 0) {
4739                 goto out_bond;
4740         }
4741
4742         lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4743
4744         if (newbond)
4745                 *newbond = bond_dev->priv;
4746
4747         netif_carrier_off(bond_dev);
4748
4749         rtnl_unlock(); /* allows sysfs registration of net device */
4750         res = bond_create_sysfs_entry(bond_dev->priv);
4751         goto done;
4752 out_bond:
4753         bond_deinit(bond_dev);
4754 out_netdev:
4755         free_netdev(bond_dev);
4756 out_rtnl:
4757         rtnl_unlock();
4758 done:
4759         return res;
4760 }
4761
4762 static int __init bonding_init(void)
4763 {
4764         int i;
4765         int res;
4766         char new_bond_name[8];  /* Enough room for 999 bonds at init. */
4767
4768         printk(KERN_INFO "%s", version);
4769
4770         res = bond_check_params(&bonding_defaults);
4771         if (res) {
4772                 goto out;
4773         }
4774
4775 #ifdef CONFIG_PROC_FS
4776         bond_create_proc_dir();
4777 #endif
4778         for (i = 0; i < max_bonds; i++) {
4779                 sprintf(new_bond_name, "bond%d",i);
4780                 res = bond_create(new_bond_name,&bonding_defaults, NULL);
4781                 if (res)
4782                         goto err;
4783         }
4784
4785         res = bond_create_sysfs();
4786         if (res)
4787                 goto err;
4788
4789         register_netdevice_notifier(&bond_netdev_notifier);
4790         register_inetaddr_notifier(&bond_inetaddr_notifier);
4791
4792         goto out;
4793 err:
4794         rtnl_lock();
4795         bond_free_all();
4796         bond_destroy_sysfs();
4797         rtnl_unlock();
4798 out:
4799         return res;
4800
4801 }
4802
4803 static void __exit bonding_exit(void)
4804 {
4805         unregister_netdevice_notifier(&bond_netdev_notifier);
4806         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4807
4808         rtnl_lock();
4809         bond_free_all();
4810         bond_destroy_sysfs();
4811         rtnl_unlock();
4812 }
4813
4814 module_init(bonding_init);
4815 module_exit(bonding_exit);
4816 MODULE_LICENSE("GPL");
4817 MODULE_VERSION(DRV_VERSION);
4818 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4819 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4820 MODULE_SUPPORTED_DEVICE("most ethernet devices");
4821
4822 /*
4823  * Local variables:
4824  *  c-indent-level: 8
4825  *  c-basic-offset: 8
4826  *  tab-width: 8
4827  * End:
4828  */
4829