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

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 //#define BONDING_DEBUG 1
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/ptrace.h>
  42 #include <linux/ioport.h>
  43 #include <linux/in.h>
  44 #include <net/ip.h>
  45 #include <linux/ip.h>
  46 #include <linux/tcp.h>
  47 #include <linux/udp.h>
  48 #include <linux/slab.h>
  49 #include <linux/string.h>
  50 #include <linux/init.h>
  51 #include <linux/timer.h>
  52 #include <linux/socket.h>
  53 #include <linux/ctype.h>
  54 #include <linux/inet.h>
  55 #include <linux/bitops.h>
  56 #include <asm/system.h>
  57 #include <asm/io.h>
  58 #include <asm/dma.h>
  59 #include <asm/uaccess.h>
  60 #include <linux/errno.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/inetdevice.h>
  63 #include <linux/igmp.h>
  64 #include <linux/etherdevice.h>
  65 #include <linux/skbuff.h>
  66 #include <net/sock.h>
  67 #include <linux/rtnetlink.h>
  68 #include <linux/proc_fs.h>
  69 #include <linux/seq_file.h>
  70 #include <linux/smp.h>
  71 #include <linux/if_ether.h>
  72 #include <net/arp.h>
  73 #include <linux/mii.h>
  74 #include <linux/ethtool.h>
  75 #include <linux/if_vlan.h>
  76 #include <linux/if_bonding.h>
  77 #include <net/route.h>
  78 #include <net/net_namespace.h>
  79 #include "bonding.h"
  80 #include "bond_3ad.h"
  81 #include "bond_alb.h"
  82
  83 /*---------------------------- Module parameters ----------------------------*/
  84
  85 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  86 #define BOND_LINK_MON_INTERV    0
  87 #define BOND_LINK_ARP_INTERV    0
  88
  89 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  90 static int miimon       = BOND_LINK_MON_INTERV;
  91 static int updelay      = 0;
  92 static int downdelay    = 0;
  93 static int use_carrier  = 1;
  94 static char *mode       = NULL;
  95 static char *primary    = NULL;
  96 static char *lacp_rate  = NULL;
  97 static char *xmit_hash_policy = NULL;
  98 static int arp_interval = BOND_LINK_ARP_INTERV;
  99 static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
 100 static char *arp_validate = NULL;
 101 struct bond_params bonding_defaults;
 102
 103 module_param(max_bonds, int, 0);
 104 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 105 module_param(miimon, int, 0);
 106 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 107 module_param(updelay, int, 0);
 108 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 109 module_param(downdelay, int, 0);
 110 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 111                             "in milliseconds");
 112 module_param(use_carrier, int, 0);
 113 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 114                               "0 for off, 1 for on (default)");
 115 module_param(mode, charp, 0);
 116 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 117                        "1 for active-backup, 2 for balance-xor, "
 118                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 119                        "6 for balance-alb");
 120 module_param(primary, charp, 0);
 121 MODULE_PARM_DESC(primary, "Primary network device to use");
 122 module_param(lacp_rate, charp, 0);
 123 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 124                             "(slow/fast)");
 125 module_param(xmit_hash_policy, charp, 0);
 126 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 127                                    ", 1 for layer 3+4");
 128 module_param(arp_interval, int, 0);
 129 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 130 module_param_array(arp_ip_target, charp, NULL, 0);
 131 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 132 module_param(arp_validate, charp, 0);
 133 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 134
 135 /*----------------------------- Global variables ----------------------------*/
 136
 137 static const char * const version =
 138         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 139
 140 LIST_HEAD(bond_dev_list);
 141
 142 #ifdef CONFIG_PROC_FS
 143 static struct proc_dir_entry *bond_proc_dir = NULL;
 144 #endif
 145
 146 extern struct rw_semaphore bonding_rwsem;
 147 static __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
 148 static int arp_ip_count = 0;
 149 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 150 static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
 151 static int lacp_fast    = 0;
 152
 153
 154 struct bond_parm_tbl bond_lacp_tbl[] = {
 155 {       "slow",         AD_LACP_SLOW},
 156 {       "fast",         AD_LACP_FAST},
 157 {       NULL,           -1},
 158 };
 159
 160 struct bond_parm_tbl bond_mode_tbl[] = {
 161 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 162 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 163 {       "balance-xor",          BOND_MODE_XOR},
 164 {       "broadcast",            BOND_MODE_BROADCAST},
 165 {       "802.3ad",              BOND_MODE_8023AD},
 166 {       "balance-tlb",          BOND_MODE_TLB},
 167 {       "balance-alb",          BOND_MODE_ALB},
 168 {       NULL,                   -1},
 169 };
 170
 171 struct bond_parm_tbl xmit_hashtype_tbl[] = {
 172 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 173 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 174 {       NULL,                   -1},
 175 };
 176
 177 struct bond_parm_tbl arp_validate_tbl[] = {
 178 {       "none",                 BOND_ARP_VALIDATE_NONE},
 179 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 180 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 181 {       "all",                  BOND_ARP_VALIDATE_ALL},
 182 {       NULL,                   -1},
 183 };
 184
 185 /*-------------------------- Forward declarations ---------------------------*/
 186
 187 static void bond_send_gratuitous_arp(struct bonding *bond);
 188
 189 /*---------------------------- General routines -----------------------------*/
 190
 191 static const char *bond_mode_name(int mode)
 192 {
 193         switch (mode) {
 194         case BOND_MODE_ROUNDROBIN :
 195                 return "load balancing (round-robin)";
 196         case BOND_MODE_ACTIVEBACKUP :
 197                 return "fault-tolerance (active-backup)";
 198         case BOND_MODE_XOR :
 199                 return "load balancing (xor)";
 200         case BOND_MODE_BROADCAST :
 201                 return "fault-tolerance (broadcast)";
 202         case BOND_MODE_8023AD:
 203                 return "IEEE 802.3ad Dynamic link aggregation";
 204         case BOND_MODE_TLB:
 205                 return "transmit load balancing";
 206         case BOND_MODE_ALB:
 207                 return "adaptive load balancing";
 208         default:
 209                 return "unknown";
 210         }
 211 }
 212
 213 /*---------------------------------- VLAN -----------------------------------*/
 214
 215 /**
 216  * bond_add_vlan - add a new vlan id on bond
 217  * @bond: bond that got the notification
 218  * @vlan_id: the vlan id to add
 219  *
 220  * Returns -ENOMEM if allocation failed.
 221  */
 222 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 223 {
 224         struct vlan_entry *vlan;
 225
 226         dprintk("bond: %s, vlan id %d\n",
 227                 (bond ? bond->dev->name: "None"), vlan_id);
 228
 229         vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 230         if (!vlan) {
 231                 return -ENOMEM;
 232         }
 233
 234         INIT_LIST_HEAD(&vlan->vlan_list);
 235         vlan->vlan_id = vlan_id;
 236         vlan->vlan_ip = 0;
 237
 238         write_lock_bh(&bond->lock);
 239
 240         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 241
 242         write_unlock_bh(&bond->lock);
 243
 244         dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 245
 246         return 0;
 247 }
 248
 249 /**
 250  * bond_del_vlan - delete a vlan id from bond
 251  * @bond: bond that got the notification
 252  * @vlan_id: the vlan id to delete
 253  *
 254  * returns -ENODEV if @vlan_id was not found in @bond.
 255  */
 256 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 257 {
 258         struct vlan_entry *vlan, *next;
 259         int res = -ENODEV;
 260
 261         dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 262
 263         write_lock_bh(&bond->lock);
 264
 265         list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
 266                 if (vlan->vlan_id == vlan_id) {
 267                         list_del(&vlan->vlan_list);
 268
 269                         if ((bond->params.mode == BOND_MODE_TLB) ||
 270                             (bond->params.mode == BOND_MODE_ALB)) {
 271                                 bond_alb_clear_vlan(bond, vlan_id);
 272                         }
 273
 274                         dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
 275                                 bond->dev->name);
 276
 277                         kfree(vlan);
 278
 279                         if (list_empty(&bond->vlan_list) &&
 280                             (bond->slave_cnt == 0)) {
 281                                 /* Last VLAN removed and no slaves, so
 282                                  * restore block on adding VLANs. This will
 283                                  * be removed once new slaves that are not
 284                                  * VLAN challenged will be added.
 285                                  */
 286                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 287                         }
 288
 289                         res = 0;
 290                         goto out;
 291                 }
 292         }
 293
 294         dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
 295                 bond->dev->name);
 296
 297 out:
 298         write_unlock_bh(&bond->lock);
 299         return res;
 300 }
 301
 302 /**
 303  * bond_has_challenged_slaves
 304  * @bond: the bond we're working on
 305  *
 306  * Searches the slave list. Returns 1 if a vlan challenged slave
 307  * was found, 0 otherwise.
 308  *
 309  * Assumes bond->lock is held.
 310  */
 311 static int bond_has_challenged_slaves(struct bonding *bond)
 312 {
 313         struct slave *slave;
 314         int i;
 315
 316         bond_for_each_slave(bond, slave, i) {
 317                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 318                         dprintk("found VLAN challenged slave - %s\n",
 319                                 slave->dev->name);
 320                         return 1;
 321                 }
 322         }
 323
 324         dprintk("no VLAN challenged slaves found\n");
 325         return 0;
 326 }
 327
 328 /**
 329  * bond_next_vlan - safely skip to the next item in the vlans list.
 330  * @bond: the bond we're working on
 331  * @curr: item we're advancing from
 332  *
 333  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 334  * or @curr->next otherwise (even if it is @curr itself again).
 335  *
 336  * Caller must hold bond->lock
 337  */
 338 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 339 {
 340         struct vlan_entry *next, *last;
 341
 342         if (list_empty(&bond->vlan_list)) {
 343                 return NULL;
 344         }
 345
 346         if (!curr) {
 347                 next = list_entry(bond->vlan_list.next,
 348                                   struct vlan_entry, vlan_list);
 349         } else {
 350                 last = list_entry(bond->vlan_list.prev,
 351                                   struct vlan_entry, vlan_list);
 352                 if (last == curr) {
 353                         next = list_entry(bond->vlan_list.next,
 354                                           struct vlan_entry, vlan_list);
 355                 } else {
 356                         next = list_entry(curr->vlan_list.next,
 357                                           struct vlan_entry, vlan_list);
 358                 }
 359         }
 360
 361         return next;
 362 }
 363
 364 /**
 365  * bond_dev_queue_xmit - Prepare skb for xmit.
 366  *
 367  * @bond: bond device that got this skb for tx.
 368  * @skb: hw accel VLAN tagged skb to transmit
 369  * @slave_dev: slave that is supposed to xmit this skbuff
 370  *
 371  * When the bond gets an skb to transmit that is
 372  * already hardware accelerated VLAN tagged, and it
 373  * needs to relay this skb to a slave that is not
 374  * hw accel capable, the skb needs to be "unaccelerated",
 375  * i.e. strip the hwaccel tag and re-insert it as part
 376  * of the payload.
 377  */
 378 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
 379 {
 380         unsigned short vlan_id;
 381
 382         if (!list_empty(&bond->vlan_list) &&
 383             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 384             vlan_get_tag(skb, &vlan_id) == 0) {
 385                 skb->dev = slave_dev;
 386                 skb = vlan_put_tag(skb, vlan_id);
 387                 if (!skb) {
 388                         /* vlan_put_tag() frees the skb in case of error,
 389                          * so return success here so the calling functions
 390                          * won't attempt to free is again.
 391                          */
 392                         return 0;
 393                 }
 394         } else {
 395                 skb->dev = slave_dev;
 396         }
 397
 398         skb->priority = 1;
 399         dev_queue_xmit(skb);
 400
 401         return 0;
 402 }
 403
 404 /*
 405  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 406  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 407  * lock because:
 408  * a. This operation is performed in IOCTL context,
 409  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 410  * c. Holding a lock with BH disabled while directly calling a base driver
 411  *    entry point is generally a BAD idea.
 412  *
 413  * The design of synchronization/protection for this operation in the 8021q
 414  * module is good for one or more VLAN devices over a single physical device
 415  * and cannot be extended for a teaming solution like bonding, so there is a
 416  * potential race condition here where a net device from the vlan group might
 417  * be referenced (either by a base driver or the 8021q code) while it is being
 418  * removed from the system. However, it turns out we're not making matters
 419  * worse, and if it works for regular VLAN usage it will work here too.
 420 */
 421
 422 /**
 423  * bond_vlan_rx_register - Propagates registration to slaves
 424  * @bond_dev: bonding net device that got called
 425  * @grp: vlan group being registered
 426  */
 427 static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
 428 {
 429         struct bonding *bond = bond_dev->priv;
 430         struct slave *slave;
 431         int i;
 432
 433         bond->vlgrp = grp;
 434
 435         bond_for_each_slave(bond, slave, i) {
 436                 struct net_device *slave_dev = slave->dev;
 437
 438                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 439                     slave_dev->vlan_rx_register) {
 440                         slave_dev->vlan_rx_register(slave_dev, grp);
 441                 }
 442         }
 443 }
 444
 445 /**
 446  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 447  * @bond_dev: bonding net device that got called
 448  * @vid: vlan id being added
 449  */
 450 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 451 {
 452         struct bonding *bond = bond_dev->priv;
 453         struct slave *slave;
 454         int i, res;
 455
 456         bond_for_each_slave(bond, slave, i) {
 457                 struct net_device *slave_dev = slave->dev;
 458
 459                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 460                     slave_dev->vlan_rx_add_vid) {
 461                         slave_dev->vlan_rx_add_vid(slave_dev, vid);
 462                 }
 463         }
 464
 465         res = bond_add_vlan(bond, vid);
 466         if (res) {
 467                 printk(KERN_ERR DRV_NAME
 468                        ": %s: Error: Failed to add vlan id %d\n",
 469                        bond_dev->name, vid);
 470         }
 471 }
 472
 473 /**
 474  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 475  * @bond_dev: bonding net device that got called
 476  * @vid: vlan id being removed
 477  */
 478 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 479 {
 480         struct bonding *bond = bond_dev->priv;
 481         struct slave *slave;
 482         struct net_device *vlan_dev;
 483         int i, res;
 484
 485         bond_for_each_slave(bond, slave, i) {
 486                 struct net_device *slave_dev = slave->dev;
 487
 488                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 489                     slave_dev->vlan_rx_kill_vid) {
 490                         /* Save and then restore vlan_dev in the grp array,
 491                          * since the slave's driver might clear it.
 492                          */
 493                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
 494                         slave_dev->vlan_rx_kill_vid(slave_dev, vid);
 495                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
 496                 }
 497         }
 498
 499         res = bond_del_vlan(bond, vid);
 500         if (res) {
 501                 printk(KERN_ERR DRV_NAME
 502                        ": %s: Error: Failed to remove vlan id %d\n",
 503                        bond_dev->name, vid);
 504         }
 505 }
 506
 507 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 508 {
 509         struct vlan_entry *vlan;
 510
 511         write_lock_bh(&bond->lock);
 512
 513         if (list_empty(&bond->vlan_list)) {
 514                 goto out;
 515         }
 516
 517         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 518             slave_dev->vlan_rx_register) {
 519                 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
 520         }
 521
 522         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 523             !(slave_dev->vlan_rx_add_vid)) {
 524                 goto out;
 525         }
 526
 527         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 528                 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 529         }
 530
 531 out:
 532         write_unlock_bh(&bond->lock);
 533 }
 534
 535 static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
 536 {
 537         struct vlan_entry *vlan;
 538         struct net_device *vlan_dev;
 539
 540         write_lock_bh(&bond->lock);
 541
 542         if (list_empty(&bond->vlan_list)) {
 543                 goto out;
 544         }
 545
 546         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 547             !(slave_dev->vlan_rx_kill_vid)) {
 548                 goto unreg;
 549         }
 550
 551         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 552                 /* Save and then restore vlan_dev in the grp array,
 553                  * since the slave's driver might clear it.
 554                  */
 555                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
 556                 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 557                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
 558         }
 559
 560 unreg:
 561         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 562             slave_dev->vlan_rx_register) {
 563                 slave_dev->vlan_rx_register(slave_dev, NULL);
 564         }
 565
 566 out:
 567         write_unlock_bh(&bond->lock);
 568 }
 569
 570 /*------------------------------- Link status -------------------------------*/
 571
 572 /*
 573  * Set the carrier state for the master according to the state of its
 574  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 575  * do special 802.3ad magic.
 576  *
 577  * Returns zero if carrier state does not change, nonzero if it does.
 578  */
 579 static int bond_set_carrier(struct bonding *bond)
 580 {
 581         struct slave *slave;
 582         int i;
 583
 584         if (bond->slave_cnt == 0)
 585                 goto down;
 586
 587         if (bond->params.mode == BOND_MODE_8023AD)
 588                 return bond_3ad_set_carrier(bond);
 589
 590         bond_for_each_slave(bond, slave, i) {
 591                 if (slave->link == BOND_LINK_UP) {
 592                         if (!netif_carrier_ok(bond->dev)) {
 593                                 netif_carrier_on(bond->dev);
 594                                 return 1;
 595                         }
 596                         return 0;
 597                 }
 598         }
 599
 600 down:
 601         if (netif_carrier_ok(bond->dev)) {
 602                 netif_carrier_off(bond->dev);
 603                 return 1;
 604         }
 605         return 0;
 606 }
 607
 608 /*
 609  * Get link speed and duplex from the slave's base driver
 610  * using ethtool. If for some reason the call fails or the
 611  * values are invalid, fake speed and duplex to 100/Full
 612  * and return error.
 613  */
 614 static int bond_update_speed_duplex(struct slave *slave)
 615 {
 616         struct net_device *slave_dev = slave->dev;
 617         struct ethtool_cmd etool;
 618         int res;
 619
 620         /* Fake speed and duplex */
 621         slave->speed = SPEED_100;
 622         slave->duplex = DUPLEX_FULL;
 623
 624         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
 625                 return -1;
 626
 627         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 628         if (res < 0)
 629                 return -1;
 630
 631         switch (etool.speed) {
 632         case SPEED_10:
 633         case SPEED_100:
 634         case SPEED_1000:
 635         case SPEED_10000:
 636                 break;
 637         default:
 638                 return -1;
 639         }
 640
 641         switch (etool.duplex) {
 642         case DUPLEX_FULL:
 643         case DUPLEX_HALF:
 644                 break;
 645         default:
 646                 return -1;
 647         }
 648
 649         slave->speed = etool.speed;
 650         slave->duplex = etool.duplex;
 651
 652         return 0;
 653 }
 654
 655 /*
 656  * if <dev> supports MII link status reporting, check its link status.
 657  *
 658  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 659  * depening upon the setting of the use_carrier parameter.
 660  *
 661  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 662  * can't tell and just pretend it is), or 0, meaning that the link is
 663  * down.
 664  *
 665  * If reporting is non-zero, instead of faking link up, return -1 if
 666  * both ETHTOOL and MII ioctls fail (meaning the device does not
 667  * support them).  If use_carrier is set, return whatever it says.
 668  * It'd be nice if there was a good way to tell if a driver supports
 669  * netif_carrier, but there really isn't.
 670  */
 671 static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
 672 {
 673         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 674         struct ifreq ifr;
 675         struct mii_ioctl_data *mii;
 676
 677         if (bond->params.use_carrier) {
 678                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 679         }
 680
 681         ioctl = slave_dev->do_ioctl;
 682         if (ioctl) {
 683                 /* TODO: set pointer to correct ioctl on a per team member */
 684                 /*       bases to make this more efficient. that is, once  */
 685                 /*       we determine the correct ioctl, we will always    */
 686                 /*       call it and not the others for that team          */
 687                 /*       member.                                           */
 688
 689                 /*
 690                  * We cannot assume that SIOCGMIIPHY will also read a
 691                  * register; not all network drivers (e.g., e100)
 692                  * support that.
 693                  */
 694
 695                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 696                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 697                 mii = if_mii(&ifr);
 698                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 699                         mii->reg_num = MII_BMSR;
 700                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
 701                                 return (mii->val_out & BMSR_LSTATUS);
 702                         }
 703                 }
 704         }
 705
 706         /*
 707          * Some drivers cache ETHTOOL_GLINK for a period of time so we only
 708          * attempt to get link status from it if the above MII ioctls fail.
 709          */
 710         if (slave_dev->ethtool_ops) {
 711                 if (slave_dev->ethtool_ops->get_link) {
 712                         u32 link;
 713
 714                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 715
 716                         return link ? BMSR_LSTATUS : 0;
 717                 }
 718         }
 719
 720         /*
 721          * If reporting, report that either there's no dev->do_ioctl,
 722          * or both SIOCGMIIREG and get_link failed (meaning that we
 723          * cannot report link status).  If not reporting, pretend
 724          * we're ok.
 725          */
 726         return (reporting ? -1 : BMSR_LSTATUS);
 727 }
 728
 729 /*----------------------------- Multicast list ------------------------------*/
 730
 731 /*
 732  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
 733  */
 734 static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
 735 {
 736         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
 737                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
 738 }
 739
 740 /*
 741  * returns dmi entry if found, NULL otherwise
 742  */
 743 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
 744 {
 745         struct dev_mc_list *idmi;
 746
 747         for (idmi = mc_list; idmi; idmi = idmi->next) {
 748                 if (bond_is_dmi_same(dmi, idmi)) {
 749                         return idmi;
 750                 }
 751         }
 752
 753         return NULL;
 754 }
 755
 756 /*
 757  * Push the promiscuity flag down to appropriate slaves
 758  */
 759 static void bond_set_promiscuity(struct bonding *bond, int inc)
 760 {
 761         if (USES_PRIMARY(bond->params.mode)) {
 762                 /* write lock already acquired */
 763                 if (bond->curr_active_slave) {
 764                         dev_set_promiscuity(bond->curr_active_slave->dev, inc);
 765                 }
 766         } else {
 767                 struct slave *slave;
 768                 int i;
 769                 bond_for_each_slave(bond, slave, i) {
 770                         dev_set_promiscuity(slave->dev, inc);
 771                 }
 772         }
 773 }
 774
 775 /*
 776  * Push the allmulti flag down to all slaves
 777  */
 778 static void bond_set_allmulti(struct bonding *bond, int inc)
 779 {
 780         if (USES_PRIMARY(bond->params.mode)) {
 781                 /* write lock already acquired */
 782                 if (bond->curr_active_slave) {
 783                         dev_set_allmulti(bond->curr_active_slave->dev, inc);
 784                 }
 785         } else {
 786                 struct slave *slave;
 787                 int i;
 788                 bond_for_each_slave(bond, slave, i) {
 789                         dev_set_allmulti(slave->dev, inc);
 790                 }
 791         }
 792 }
 793
 794 /*
 795  * Add a Multicast address to slaves
 796  * according to mode
 797  */
 798 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
 799 {
 800         if (USES_PRIMARY(bond->params.mode)) {
 801                 /* write lock already acquired */
 802                 if (bond->curr_active_slave) {
 803                         dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
 804                 }
 805         } else {
 806                 struct slave *slave;
 807                 int i;
 808                 bond_for_each_slave(bond, slave, i) {
 809                         dev_mc_add(slave->dev, addr, alen, 0);
 810                 }
 811         }
 812 }
 813
 814 /*
 815  * Remove a multicast address from slave
 816  * according to mode
 817  */
 818 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
 819 {
 820         if (USES_PRIMARY(bond->params.mode)) {
 821                 /* write lock already acquired */
 822                 if (bond->curr_active_slave) {
 823                         dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
 824                 }
 825         } else {
 826                 struct slave *slave;
 827                 int i;
 828                 bond_for_each_slave(bond, slave, i) {
 829                         dev_mc_delete(slave->dev, addr, alen, 0);
 830                 }
 831         }
 832 }
 833
 834
 835 /*
 836  * Retrieve the list of registered multicast addresses for the bonding
 837  * device and retransmit an IGMP JOIN request to the current active
 838  * slave.
 839  */
 840 static void bond_resend_igmp_join_requests(struct bonding *bond)
 841 {
 842         struct in_device *in_dev;
 843         struct ip_mc_list *im;
 844
 845         rcu_read_lock();
 846         in_dev = __in_dev_get_rcu(bond->dev);
 847         if (in_dev) {
 848                 for (im = in_dev->mc_list; im; im = im->next) {
 849                         ip_mc_rejoin_group(im);
 850                 }
 851         }
 852
 853         rcu_read_unlock();
 854 }
 855
 856 /*
 857  * Totally destroys the mc_list in bond
 858  */
 859 static void bond_mc_list_destroy(struct bonding *bond)
 860 {
 861         struct dev_mc_list *dmi;
 862
 863         dmi = bond->mc_list;
 864         while (dmi) {
 865                 bond->mc_list = dmi->next;
 866                 kfree(dmi);
 867                 dmi = bond->mc_list;
 868         }
 869         bond->mc_list = NULL;
 870 }
 871
 872 /*
 873  * Copy all the Multicast addresses from src to the bonding device dst
 874  */
 875 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
 876                              gfp_t gfp_flag)
 877 {
 878         struct dev_mc_list *dmi, *new_dmi;
 879
 880         for (dmi = mc_list; dmi; dmi = dmi->next) {
 881                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
 882
 883                 if (!new_dmi) {
 884                         /* FIXME: Potential memory leak !!! */
 885                         return -ENOMEM;
 886                 }
 887
 888                 new_dmi->next = bond->mc_list;
 889                 bond->mc_list = new_dmi;
 890                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
 891                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
 892                 new_dmi->dmi_users = dmi->dmi_users;
 893                 new_dmi->dmi_gusers = dmi->dmi_gusers;
 894         }
 895
 896         return 0;
 897 }
 898
 899 /*
 900  * flush all members of flush->mc_list from device dev->mc_list
 901  */
 902 static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
 903 {
 904         struct bonding *bond = bond_dev->priv;
 905         struct dev_mc_list *dmi;
 906
 907         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
 908                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 909         }
 910
 911         if (bond->params.mode == BOND_MODE_8023AD) {
 912                 /* del lacpdu mc addr from mc list */
 913                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 914
 915                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
 916         }
 917 }
 918
 919 /*--------------------------- Active slave change ---------------------------*/
 920
 921 /*
 922  * Update the mc list and multicast-related flags for the new and
 923  * old active slaves (if any) according to the multicast mode, and
 924  * promiscuous flags unconditionally.
 925  */
 926 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
 927 {
 928         struct dev_mc_list *dmi;
 929
 930         if (!USES_PRIMARY(bond->params.mode)) {
 931                 /* nothing to do -  mc list is already up-to-date on
 932                  * all slaves
 933                  */
 934                 return;
 935         }
 936
 937         if (old_active) {
 938                 if (bond->dev->flags & IFF_PROMISC) {
 939                         dev_set_promiscuity(old_active->dev, -1);
 940                 }
 941
 942                 if (bond->dev->flags & IFF_ALLMULTI) {
 943                         dev_set_allmulti(old_active->dev, -1);
 944                 }
 945
 946                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 947                         dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 948                 }
 949         }
 950
 951         if (new_active) {
 952                 if (bond->dev->flags & IFF_PROMISC) {
 953                         dev_set_promiscuity(new_active->dev, 1);
 954                 }
 955
 956                 if (bond->dev->flags & IFF_ALLMULTI) {
 957                         dev_set_allmulti(new_active->dev, 1);
 958                 }
 959
 960                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 961                         dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 962                 }
 963                 bond_resend_igmp_join_requests(bond);
 964         }
 965 }
 966
 967 /**
 968  * find_best_interface - select the best available slave to be the active one
 969  * @bond: our bonding struct
 970  *
 971  * Warning: Caller must hold curr_slave_lock for writing.
 972  */
 973 static struct slave *bond_find_best_slave(struct bonding *bond)
 974 {
 975         struct slave *new_active, *old_active;
 976         struct slave *bestslave = NULL;
 977         int mintime = bond->params.updelay;
 978         int i;
 979
 980         new_active = old_active = bond->curr_active_slave;
 981
 982         if (!new_active) { /* there were no active slaves left */
 983                 if (bond->slave_cnt > 0) {  /* found one slave */
 984                         new_active = bond->first_slave;
 985                 } else {
 986                         return NULL; /* still no slave, return NULL */
 987                 }
 988         }
 989
 990         /* first try the primary link; if arping, a link must tx/rx traffic
 991          * before it can be considered the curr_active_slave - also, we would skip
 992          * slaves between the curr_active_slave and primary_slave that may be up
 993          * and able to arp
 994          */
 995         if ((bond->primary_slave) &&
 996             (!bond->params.arp_interval) &&
 997             (IS_UP(bond->primary_slave->dev))) {
 998                 new_active = bond->primary_slave;
 999         }
1000
1001         /* remember where to stop iterating over the slaves */
1002         old_active = new_active;
1003
1004         bond_for_each_slave_from(bond, new_active, i, old_active) {
1005                 if (IS_UP(new_active->dev)) {
1006                         if (new_active->link == BOND_LINK_UP) {
1007                                 return new_active;
1008                         } else if (new_active->link == BOND_LINK_BACK) {
1009                                 /* link up, but waiting for stabilization */
1010                                 if (new_active->delay < mintime) {
1011                                         mintime = new_active->delay;
1012                                         bestslave = new_active;
1013                                 }
1014                         }
1015                 }
1016         }
1017
1018         return bestslave;
1019 }
1020
1021 /**
1022  * change_active_interface - change the active slave into the specified one
1023  * @bond: our bonding struct
1024  * @new: the new slave to make the active one
1025  *
1026  * Set the new slave to the bond's settings and unset them on the old
1027  * curr_active_slave.
1028  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1029  *
1030  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1031  * because it is apparently the best available slave we have, even though its
1032  * updelay hasn't timed out yet.
1033  *
1034  * Warning: Caller must hold curr_slave_lock for writing.
1035  */
1036 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1037 {
1038         struct slave *old_active = bond->curr_active_slave;
1039
1040         if (old_active == new_active) {
1041                 return;
1042         }
1043
1044         if (new_active) {
1045                 if (new_active->link == BOND_LINK_BACK) {
1046                         if (USES_PRIMARY(bond->params.mode)) {
1047                                 printk(KERN_INFO DRV_NAME
1048                                        ": %s: making interface %s the new "
1049                                        "active one %d ms earlier.\n",
1050                                        bond->dev->name, new_active->dev->name,
1051                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1052                         }
1053
1054                         new_active->delay = 0;
1055                         new_active->link = BOND_LINK_UP;
1056                         new_active->jiffies = jiffies;
1057
1058                         if (bond->params.mode == BOND_MODE_8023AD) {
1059                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1060                         }
1061
1062                         if ((bond->params.mode == BOND_MODE_TLB) ||
1063                             (bond->params.mode == BOND_MODE_ALB)) {
1064                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1065                         }
1066                 } else {
1067                         if (USES_PRIMARY(bond->params.mode)) {
1068                                 printk(KERN_INFO DRV_NAME
1069                                        ": %s: making interface %s the new "
1070                                        "active one.\n",
1071                                        bond->dev->name, new_active->dev->name);
1072                         }
1073                 }
1074         }
1075
1076         if (USES_PRIMARY(bond->params.mode)) {
1077                 bond_mc_swap(bond, new_active, old_active);
1078         }
1079
1080         if ((bond->params.mode == BOND_MODE_TLB) ||
1081             (bond->params.mode == BOND_MODE_ALB)) {
1082                 bond_alb_handle_active_change(bond, new_active);
1083                 if (old_active)
1084                         bond_set_slave_inactive_flags(old_active);
1085                 if (new_active)
1086                         bond_set_slave_active_flags(new_active);
1087         } else {
1088                 bond->curr_active_slave = new_active;
1089         }
1090
1091         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1092                 if (old_active) {
1093                         bond_set_slave_inactive_flags(old_active);
1094                 }
1095
1096                 if (new_active) {
1097                         bond_set_slave_active_flags(new_active);
1098                 }
1099                 bond_send_gratuitous_arp(bond);
1100         }
1101 }
1102
1103 /**
1104  * bond_select_active_slave - select a new active slave, if needed
1105  * @bond: our bonding struct
1106  *
1107  * This functions shoud be called when one of the following occurs:
1108  * - The old curr_active_slave has been released or lost its link.
1109  * - The primary_slave has got its link back.
1110  * - A slave has got its link back and there's no old curr_active_slave.
1111  *
1112  * Warning: Caller must hold curr_slave_lock for writing.
1113  */
1114 void bond_select_active_slave(struct bonding *bond)
1115 {
1116         struct slave *best_slave;
1117         int rv;
1118
1119         best_slave = bond_find_best_slave(bond);
1120         if (best_slave != bond->curr_active_slave) {
1121                 bond_change_active_slave(bond, best_slave);
1122                 rv = bond_set_carrier(bond);
1123                 if (!rv)
1124                         return;
1125
1126                 if (netif_carrier_ok(bond->dev)) {
1127                         printk(KERN_INFO DRV_NAME
1128                                ": %s: first active interface up!\n",
1129                                bond->dev->name);
1130                 } else {
1131                         printk(KERN_INFO DRV_NAME ": %s: "
1132                                "now running without any active interface !\n",
1133                                bond->dev->name);
1134                 }
1135         }
1136 }
1137
1138 /*--------------------------- slave list handling ---------------------------*/
1139
1140 /*
1141  * This function attaches the slave to the end of list.
1142  *
1143  * bond->lock held for writing by caller.
1144  */
1145 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1146 {
1147         if (bond->first_slave == NULL) { /* attaching the first slave */
1148                 new_slave->next = new_slave;
1149                 new_slave->prev = new_slave;
1150                 bond->first_slave = new_slave;
1151         } else {
1152                 new_slave->next = bond->first_slave;
1153                 new_slave->prev = bond->first_slave->prev;
1154                 new_slave->next->prev = new_slave;
1155                 new_slave->prev->next = new_slave;
1156         }
1157
1158         bond->slave_cnt++;
1159 }
1160
1161 /*
1162  * This function detaches the slave from the list.
1163  * WARNING: no check is made to verify if the slave effectively
1164  * belongs to <bond>.
1165  * Nothing is freed on return, structures are just unchained.
1166  * If any slave pointer in bond was pointing to <slave>,
1167  * it should be changed by the calling function.
1168  *
1169  * bond->lock held for writing by caller.
1170  */
1171 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1172 {
1173         if (slave->next) {
1174                 slave->next->prev = slave->prev;
1175         }
1176
1177         if (slave->prev) {
1178                 slave->prev->next = slave->next;
1179         }
1180
1181         if (bond->first_slave == slave) { /* slave is the first slave */
1182                 if (bond->slave_cnt > 1) { /* there are more slave */
1183                         bond->first_slave = slave->next;
1184                 } else {
1185                         bond->first_slave = NULL; /* slave was the last one */
1186                 }
1187         }
1188
1189         slave->next = NULL;
1190         slave->prev = NULL;
1191         bond->slave_cnt--;
1192 }
1193
1194 /*---------------------------------- IOCTL ----------------------------------*/
1195
1196 static int bond_sethwaddr(struct net_device *bond_dev,
1197                           struct net_device *slave_dev)
1198 {
1199         dprintk("bond_dev=%p\n", bond_dev);
1200         dprintk("slave_dev=%p\n", slave_dev);
1201         dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1202         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1203         return 0;
1204 }
1205
1206 #define BOND_VLAN_FEATURES \
1207         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1208          NETIF_F_HW_VLAN_FILTER)
1209
1210 /*
1211  * Compute the common dev->feature set available to all slaves.  Some
1212  * feature bits are managed elsewhere, so preserve those feature bits
1213  * on the master device.
1214  */
1215 static int bond_compute_features(struct bonding *bond)
1216 {
1217         struct slave *slave;
1218         struct net_device *bond_dev = bond->dev;
1219         unsigned long features = bond_dev->features;
1220         unsigned short max_hard_header_len = ETH_HLEN;
1221         int i;
1222
1223         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1224         features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
1225                     NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1226
1227         bond_for_each_slave(bond, slave, i) {
1228                 features = netdev_compute_features(features,
1229                                                    slave->dev->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         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1235         bond_dev->features = features;
1236         bond_dev->hard_header_len = max_hard_header_len;
1237
1238         return 0;
1239 }
1240
1241 /* enslave device <slave> to bond device <master> */
1242 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1243 {
1244         struct bonding *bond = bond_dev->priv;
1245         struct slave *new_slave = NULL;
1246         struct dev_mc_list *dmi;
1247         struct sockaddr addr;
1248         int link_reporting;
1249         int old_features = bond_dev->features;
1250         int res = 0;
1251
1252         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1253                 slave_dev->do_ioctl == NULL) {
1254                 printk(KERN_WARNING DRV_NAME
1255                        ": %s: Warning: no link monitoring support for %s\n",
1256                        bond_dev->name, slave_dev->name);
1257         }
1258
1259         /* bond must be initialized by bond_open() before enslaving */
1260         if (!(bond_dev->flags & IFF_UP)) {
1261                 dprintk("Error, master_dev is not up\n");
1262                 return -EPERM;
1263         }
1264
1265         /* already enslaved */
1266         if (slave_dev->flags & IFF_SLAVE) {
1267                 dprintk("Error, Device was already enslaved\n");
1268                 return -EBUSY;
1269         }
1270
1271         /* vlan challenged mutual exclusion */
1272         /* no need to lock since we're protected by rtnl_lock */
1273         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1274                 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1275                 if (!list_empty(&bond->vlan_list)) {
1276                         printk(KERN_ERR DRV_NAME
1277                                ": %s: Error: cannot enslave VLAN "
1278                                "challenged slave %s on VLAN enabled "
1279                                "bond %s\n", bond_dev->name, slave_dev->name,
1280                                bond_dev->name);
1281                         return -EPERM;
1282                 } else {
1283                         printk(KERN_WARNING DRV_NAME
1284                                ": %s: Warning: enslaved VLAN challenged "
1285                                "slave %s. Adding VLANs will be blocked as "
1286                                "long as %s is part of bond %s\n",
1287                                bond_dev->name, slave_dev->name, slave_dev->name,
1288                                bond_dev->name);
1289                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1290                 }
1291         } else {
1292                 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1293                 if (bond->slave_cnt == 0) {
1294                         /* First slave, and it is not VLAN challenged,
1295                          * so remove the block of adding VLANs over the bond.
1296                          */
1297                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1298                 }
1299         }
1300
1301         /*
1302          * Old ifenslave binaries are no longer supported.  These can
1303          * be identified with moderate accurary by the state of the slave:
1304          * the current ifenslave will set the interface down prior to
1305          * enslaving it; the old ifenslave will not.
1306          */
1307         if ((slave_dev->flags & IFF_UP)) {
1308                 printk(KERN_ERR DRV_NAME ": %s is up. "
1309                        "This may be due to an out of date ifenslave.\n",
1310                        slave_dev->name);
1311                 res = -EPERM;
1312                 goto err_undo_flags;
1313         }
1314
1315         if (slave_dev->set_mac_address == NULL) {
1316                 printk(KERN_ERR DRV_NAME
1317                         ": %s: Error: The slave device you specified does "
1318                         "not support setting the MAC address. "
1319                         "Your kernel likely does not support slave "
1320                         "devices.\n", bond_dev->name);
1321                 res = -EOPNOTSUPP;
1322                 goto err_undo_flags;
1323         }
1324
1325         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1326         if (!new_slave) {
1327                 res = -ENOMEM;
1328                 goto err_undo_flags;
1329         }
1330
1331         /* save slave's original flags before calling
1332          * netdev_set_master and dev_open
1333          */
1334         new_slave->original_flags = slave_dev->flags;
1335
1336         /*
1337          * Save slave's original ("permanent") mac address for modes
1338          * that need it, and for restoring it upon release, and then
1339          * set it to the master's address
1340          */
1341         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1342
1343         /*
1344          * Set slave to master's mac address.  The application already
1345          * set the master's mac address to that of the first slave
1346          */
1347         memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1348         addr.sa_family = slave_dev->type;
1349         res = dev_set_mac_address(slave_dev, &addr);
1350         if (res) {
1351                 dprintk("Error %d calling set_mac_address\n", res);
1352                 goto err_free;
1353         }
1354
1355         res = netdev_set_master(slave_dev, bond_dev);
1356         if (res) {
1357                 dprintk("Error %d calling netdev_set_master\n", res);
1358                 goto err_close;
1359         }
1360         /* open the slave since the application closed it */
1361         res = dev_open(slave_dev);
1362         if (res) {
1363                 dprintk("Openning slave %s failed\n", slave_dev->name);
1364                 goto err_restore_mac;
1365         }
1366
1367         new_slave->dev = slave_dev;
1368         slave_dev->priv_flags |= IFF_BONDING;
1369
1370         if ((bond->params.mode == BOND_MODE_TLB) ||
1371             (bond->params.mode == BOND_MODE_ALB)) {
1372                 /* bond_alb_init_slave() must be called before all other stages since
1373                  * it might fail and we do not want to have to undo everything
1374                  */
1375                 res = bond_alb_init_slave(bond, new_slave);
1376                 if (res) {
1377                         goto err_unset_master;
1378                 }
1379         }
1380
1381         /* If the mode USES_PRIMARY, then the new slave gets the
1382          * master's promisc (and mc) settings only if it becomes the
1383          * curr_active_slave, and that is taken care of later when calling
1384          * bond_change_active()
1385          */
1386         if (!USES_PRIMARY(bond->params.mode)) {
1387                 /* set promiscuity level to new slave */
1388                 if (bond_dev->flags & IFF_PROMISC) {
1389                         dev_set_promiscuity(slave_dev, 1);
1390                 }
1391
1392                 /* set allmulti level to new slave */
1393                 if (bond_dev->flags & IFF_ALLMULTI) {
1394                         dev_set_allmulti(slave_dev, 1);
1395                 }
1396
1397                 /* upload master's mc_list to new slave */
1398                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1399                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1400                 }
1401         }
1402
1403         if (bond->params.mode == BOND_MODE_8023AD) {
1404                 /* add lacpdu mc addr to mc list */
1405                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1406
1407                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1408         }
1409
1410         bond_add_vlans_on_slave(bond, slave_dev);
1411
1412         write_lock_bh(&bond->lock);
1413
1414         bond_attach_slave(bond, new_slave);
1415
1416         new_slave->delay = 0;
1417         new_slave->link_failure_count = 0;
1418
1419         bond_compute_features(bond);
1420
1421         new_slave->last_arp_rx = jiffies;
1422
1423         if (bond->params.miimon && !bond->params.use_carrier) {
1424                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1425
1426                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1427                         /*
1428                          * miimon is set but a bonded network driver
1429                          * does not support ETHTOOL/MII and
1430                          * arp_interval is not set.  Note: if
1431                          * use_carrier is enabled, we will never go
1432                          * here (because netif_carrier is always
1433                          * supported); thus, we don't need to change
1434                          * the messages for netif_carrier.
1435                          */
1436                         printk(KERN_WARNING DRV_NAME
1437                                ": %s: Warning: MII and ETHTOOL support not "
1438                                "available for interface %s, and "
1439                                "arp_interval/arp_ip_target module parameters "
1440                                "not specified, thus bonding will not detect "
1441                                "link failures! see bonding.txt for details.\n",
1442                                bond_dev->name, slave_dev->name);
1443                 } else if (link_reporting == -1) {
1444                         /* unable get link status using mii/ethtool */
1445                         printk(KERN_WARNING DRV_NAME
1446                                ": %s: Warning: can't get link status from "
1447                                "interface %s; the network driver associated "
1448                                "with this interface does not support MII or "
1449                                "ETHTOOL link status reporting, thus miimon "
1450                                "has no effect on this interface.\n",
1451                                bond_dev->name, slave_dev->name);
1452                 }
1453         }
1454
1455         /* check for initial state */
1456         if (!bond->params.miimon ||
1457             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1458                 if (bond->params.updelay) {
1459                         dprintk("Initial state of slave_dev is "
1460                                 "BOND_LINK_BACK\n");
1461                         new_slave->link  = BOND_LINK_BACK;
1462                         new_slave->delay = bond->params.updelay;
1463                 } else {
1464                         dprintk("Initial state of slave_dev is "
1465                                 "BOND_LINK_UP\n");
1466                         new_slave->link  = BOND_LINK_UP;
1467                 }
1468                 new_slave->jiffies = jiffies;
1469         } else {
1470                 dprintk("Initial state of slave_dev is "
1471                         "BOND_LINK_DOWN\n");
1472                 new_slave->link  = BOND_LINK_DOWN;
1473         }
1474
1475         if (bond_update_speed_duplex(new_slave) &&
1476             (new_slave->link != BOND_LINK_DOWN)) {
1477                 printk(KERN_WARNING DRV_NAME
1478                        ": %s: Warning: failed to get speed and duplex from %s, "
1479                        "assumed to be 100Mb/sec and Full.\n",
1480                        bond_dev->name, new_slave->dev->name);
1481
1482                 if (bond->params.mode == BOND_MODE_8023AD) {
1483                         printk(KERN_WARNING DRV_NAME
1484                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1485                                "support in base driver for proper aggregator "
1486                                "selection.\n", bond_dev->name);
1487                 }
1488         }
1489
1490         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1491                 /* if there is a primary slave, remember it */
1492                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1493                         bond->primary_slave = new_slave;
1494                 }
1495         }
1496
1497         switch (bond->params.mode) {
1498         case BOND_MODE_ACTIVEBACKUP:
1499                 bond_set_slave_inactive_flags(new_slave);
1500                 bond_select_active_slave(bond);
1501                 break;
1502         case BOND_MODE_8023AD:
1503                 /* in 802.3ad mode, the internal mechanism
1504                  * will activate the slaves in the selected
1505                  * aggregator
1506                  */
1507                 bond_set_slave_inactive_flags(new_slave);
1508                 /* if this is the first slave */
1509                 if (bond->slave_cnt == 1) {
1510                         SLAVE_AD_INFO(new_slave).id = 1;
1511                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1512                          * can be called only after the mac address of the bond is set
1513                          */
1514                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1515                                             bond->params.lacp_fast);
1516                 } else {
1517                         SLAVE_AD_INFO(new_slave).id =
1518                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1519                 }
1520
1521                 bond_3ad_bind_slave(new_slave);
1522                 break;
1523         case BOND_MODE_TLB:
1524         case BOND_MODE_ALB:
1525                 new_slave->state = BOND_STATE_ACTIVE;
1526                 if ((!bond->curr_active_slave) &&
1527                     (new_slave->link != BOND_LINK_DOWN)) {
1528                         /* first slave or no active slave yet, and this link
1529                          * is OK, so make this interface the active one
1530                          */
1531                         bond_change_active_slave(bond, new_slave);
1532                 } else {
1533                         bond_set_slave_inactive_flags(new_slave);
1534                 }
1535                 break;
1536         default:
1537                 dprintk("This slave is always active in trunk mode\n");
1538
1539                 /* always active in trunk mode */
1540                 new_slave->state = BOND_STATE_ACTIVE;
1541
1542                 /* In trunking mode there is little meaning to curr_active_slave
1543                  * anyway (it holds no special properties of the bond device),
1544                  * so we can change it without calling change_active_interface()
1545                  */
1546                 if (!bond->curr_active_slave) {
1547                         bond->curr_active_slave = new_slave;
1548                 }
1549                 break;
1550         } /* switch(bond_mode) */
1551
1552         bond_set_carrier(bond);
1553
1554         write_unlock_bh(&bond->lock);
1555
1556         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1557         if (res)
1558                 goto err_unset_master;
1559
1560         printk(KERN_INFO DRV_NAME
1561                ": %s: enslaving %s as a%s interface with a%s link.\n",
1562                bond_dev->name, slave_dev->name,
1563                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1564                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1565
1566         /* enslave is successful */
1567         return 0;
1568
1569 /* Undo stages on error */
1570 err_unset_master:
1571         netdev_set_master(slave_dev, NULL);
1572
1573 err_close:
1574         dev_close(slave_dev);
1575
1576 err_restore_mac:
1577         memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1578         addr.sa_family = slave_dev->type;
1579         dev_set_mac_address(slave_dev, &addr);
1580
1581 err_free:
1582         kfree(new_slave);
1583
1584 err_undo_flags:
1585         bond_dev->features = old_features;
1586
1587         return res;
1588 }
1589
1590 /*
1591  * Try to release the slave device <slave> from the bond device <master>
1592  * It is legal to access curr_active_slave without a lock because all the function
1593  * is write-locked.
1594  *
1595  * The rules for slave state should be:
1596  *   for Active/Backup:
1597  *     Active stays on all backups go down
1598  *   for Bonded connections:
1599  *     The first up interface should be left on and all others downed.
1600  */
1601 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1602 {
1603         struct bonding *bond = bond_dev->priv;
1604         struct slave *slave, *oldcurrent;
1605         struct sockaddr addr;
1606         int mac_addr_differ;
1607         DECLARE_MAC_BUF(mac);
1608
1609         /* slave is not a slave or master is not master of this slave */
1610         if (!(slave_dev->flags & IFF_SLAVE) ||
1611             (slave_dev->master != bond_dev)) {
1612                 printk(KERN_ERR DRV_NAME
1613                        ": %s: Error: cannot release %s.\n",
1614                        bond_dev->name, slave_dev->name);
1615                 return -EINVAL;
1616         }
1617
1618         write_lock_bh(&bond->lock);
1619
1620         slave = bond_get_slave_by_dev(bond, slave_dev);
1621         if (!slave) {
1622                 /* not a slave of this bond */
1623                 printk(KERN_INFO DRV_NAME
1624                        ": %s: %s not enslaved\n",
1625                        bond_dev->name, slave_dev->name);
1626                 write_unlock_bh(&bond->lock);
1627                 return -EINVAL;
1628         }
1629
1630         mac_addr_differ = memcmp(bond_dev->dev_addr,
1631                                  slave->perm_hwaddr,
1632                                  ETH_ALEN);
1633         if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1634                 printk(KERN_WARNING DRV_NAME
1635                        ": %s: Warning: the permanent HWaddr of %s - "
1636                        "%s - is still in use by %s. "
1637                        "Set the HWaddr of %s to a different address "
1638                        "to avoid conflicts.\n",
1639                        bond_dev->name,
1640                        slave_dev->name,
1641                        print_mac(mac, slave->perm_hwaddr),
1642                        bond_dev->name,
1643                        slave_dev->name);
1644         }
1645
1646         /* Inform AD package of unbinding of slave. */
1647         if (bond->params.mode == BOND_MODE_8023AD) {
1648                 /* must be called before the slave is
1649                  * detached from the list
1650                  */
1651                 bond_3ad_unbind_slave(slave);
1652         }
1653
1654         printk(KERN_INFO DRV_NAME
1655                ": %s: releasing %s interface %s\n",
1656                bond_dev->name,
1657                (slave->state == BOND_STATE_ACTIVE)
1658                ? "active" : "backup",
1659                slave_dev->name);
1660
1661         oldcurrent = bond->curr_active_slave;
1662
1663         bond->current_arp_slave = NULL;
1664
1665         /* release the slave from its bond */
1666         bond_detach_slave(bond, slave);
1667
1668         bond_compute_features(bond);
1669
1670         if (bond->primary_slave == slave) {
1671                 bond->primary_slave = NULL;
1672         }
1673
1674         if (oldcurrent == slave) {
1675                 bond_change_active_slave(bond, NULL);
1676         }
1677
1678         if ((bond->params.mode == BOND_MODE_TLB) ||
1679             (bond->params.mode == BOND_MODE_ALB)) {
1680                 /* Must be called only after the slave has been
1681                  * detached from the list and the curr_active_slave
1682                  * has been cleared (if our_slave == old_current),
1683                  * but before a new active slave is selected.
1684                  */
1685                 bond_alb_deinit_slave(bond, slave);
1686         }
1687
1688         if (oldcurrent == slave)
1689                 bond_select_active_slave(bond);
1690
1691         if (bond->slave_cnt == 0) {
1692                 bond_set_carrier(bond);
1693
1694                 /* if the last slave was removed, zero the mac address
1695                  * of the master so it will be set by the application
1696                  * to the mac address of the first slave
1697                  */
1698                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1699
1700                 if (list_empty(&bond->vlan_list)) {
1701                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1702                 } else {
1703                         printk(KERN_WARNING DRV_NAME
1704                                ": %s: Warning: clearing HW address of %s while it "
1705                                "still has VLANs.\n",
1706                                bond_dev->name, bond_dev->name);
1707                         printk(KERN_WARNING DRV_NAME
1708                                ": %s: When re-adding slaves, make sure the bond's "
1709                                "HW address matches its VLANs'.\n",
1710                                bond_dev->name);
1711                 }
1712         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1713                    !bond_has_challenged_slaves(bond)) {
1714                 printk(KERN_INFO DRV_NAME
1715                        ": %s: last VLAN challenged slave %s "
1716                        "left bond %s. VLAN blocking is removed\n",
1717                        bond_dev->name, slave_dev->name, bond_dev->name);
1718                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1719         }
1720
1721         write_unlock_bh(&bond->lock);
1722
1723         /* must do this from outside any spinlocks */
1724         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1725
1726         bond_del_vlans_from_slave(bond, slave_dev);
1727
1728         /* If the mode USES_PRIMARY, then we should only remove its
1729          * promisc and mc settings if it was the curr_active_slave, but that was
1730          * already taken care of above when we detached the slave
1731          */
1732         if (!USES_PRIMARY(bond->params.mode)) {
1733                 /* unset promiscuity level from slave */
1734                 if (bond_dev->flags & IFF_PROMISC) {
1735                         dev_set_promiscuity(slave_dev, -1);
1736                 }
1737
1738                 /* unset allmulti level from slave */
1739                 if (bond_dev->flags & IFF_ALLMULTI) {
1740                         dev_set_allmulti(slave_dev, -1);
1741                 }
1742
1743                 /* flush master's mc_list from slave */
1744                 bond_mc_list_flush(bond_dev, slave_dev);
1745         }
1746
1747         netdev_set_master(slave_dev, NULL);
1748
1749         /* close slave before restoring its mac address */
1750         dev_close(slave_dev);
1751
1752         /* restore original ("permanent") mac address */
1753         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1754         addr.sa_family = slave_dev->type;
1755         dev_set_mac_address(slave_dev, &addr);
1756
1757         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1758                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1759                                    IFF_SLAVE_NEEDARP);
1760
1761         kfree(slave);
1762
1763         return 0;  /* deletion OK */
1764 }
1765
1766 /*
1767  * This function releases all slaves.
1768  */
1769 static int bond_release_all(struct net_device *bond_dev)
1770 {
1771         struct bonding *bond = bond_dev->priv;
1772         struct slave *slave;
1773         struct net_device *slave_dev;
1774         struct sockaddr addr;
1775
1776         write_lock_bh(&bond->lock);
1777
1778         netif_carrier_off(bond_dev);
1779
1780         if (bond->slave_cnt == 0) {
1781                 goto out;
1782         }
1783
1784         bond->current_arp_slave = NULL;
1785         bond->primary_slave = NULL;
1786         bond_change_active_slave(bond, NULL);
1787
1788         while ((slave = bond->first_slave) != NULL) {
1789                 /* Inform AD package of unbinding of slave
1790                  * before slave is detached from the list.
1791                  */
1792                 if (bond->params.mode == BOND_MODE_8023AD) {
1793                         bond_3ad_unbind_slave(slave);
1794                 }
1795
1796                 slave_dev = slave->dev;
1797                 bond_detach_slave(bond, slave);
1798
1799                 if ((bond->params.mode == BOND_MODE_TLB) ||
1800                     (bond->params.mode == BOND_MODE_ALB)) {
1801                         /* must be called only after the slave
1802                          * has been detached from the list
1803                          */
1804                         bond_alb_deinit_slave(bond, slave);
1805                 }
1806
1807                 bond_compute_features(bond);
1808
1809                 /* now that the slave is detached, unlock and perform
1810                  * all the undo steps that should not be called from
1811                  * within a lock.
1812                  */
1813                 write_unlock_bh(&bond->lock);
1814
1815                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1816                 bond_del_vlans_from_slave(bond, slave_dev);
1817
1818                 /* If the mode USES_PRIMARY, then we should only remove its
1819                  * promisc and mc settings if it was the curr_active_slave, but that was
1820                  * already taken care of above when we detached the slave
1821                  */
1822                 if (!USES_PRIMARY(bond->params.mode)) {
1823                         /* unset promiscuity level from slave */
1824                         if (bond_dev->flags & IFF_PROMISC) {
1825                                 dev_set_promiscuity(slave_dev, -1);
1826                         }
1827
1828                         /* unset allmulti level from slave */
1829                         if (bond_dev->flags & IFF_ALLMULTI) {
1830                                 dev_set_allmulti(slave_dev, -1);
1831                         }
1832
1833                         /* flush master's mc_list from slave */
1834                         bond_mc_list_flush(bond_dev, slave_dev);
1835                 }
1836
1837                 netdev_set_master(slave_dev, NULL);
1838
1839                 /* close slave before restoring its mac address */
1840                 dev_close(slave_dev);
1841
1842                 /* restore original ("permanent") mac address*/
1843                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1844                 addr.sa_family = slave_dev->type;
1845                 dev_set_mac_address(slave_dev, &addr);
1846
1847                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1848                                            IFF_SLAVE_INACTIVE);
1849
1850                 kfree(slave);
1851
1852                 /* re-acquire the lock before getting the next slave */
1853                 write_lock_bh(&bond->lock);
1854         }
1855
1856         /* zero the mac address of the master so it will be
1857          * set by the application to the mac address of the
1858          * first slave
1859          */
1860         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1861
1862         if (list_empty(&bond->vlan_list)) {
1863                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1864         } else {
1865                 printk(KERN_WARNING DRV_NAME
1866                        ": %s: Warning: clearing HW address of %s while it "
1867                        "still has VLANs.\n",
1868                        bond_dev->name, bond_dev->name);
1869                 printk(KERN_WARNING DRV_NAME
1870                        ": %s: When re-adding slaves, make sure the bond's "
1871                        "HW address matches its VLANs'.\n",
1872                        bond_dev->name);
1873         }
1874
1875         printk(KERN_INFO DRV_NAME
1876                ": %s: released all slaves\n",
1877                bond_dev->name);
1878
1879 out:
1880         write_unlock_bh(&bond->lock);
1881
1882         return 0;
1883 }
1884
1885 /*
1886  * This function changes the active slave to slave <slave_dev>.
1887  * It returns -EINVAL in the following cases.
1888  *  - <slave_dev> is not found in the list.
1889  *  - There is not active slave now.
1890  *  - <slave_dev> is already active.
1891  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1892  *  - <slave_dev> is not running.
1893  * In these cases, this fuction does nothing.
1894  * In the other cases, currnt_slave pointer is changed and 0 is returned.
1895  */
1896 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1897 {
1898         struct bonding *bond = bond_dev->priv;
1899         struct slave *old_active = NULL;
1900         struct slave *new_active = NULL;
1901         int res = 0;
1902
1903         if (!USES_PRIMARY(bond->params.mode)) {
1904                 return -EINVAL;
1905         }
1906
1907         /* Verify that master_dev is indeed the master of slave_dev */
1908         if (!(slave_dev->flags & IFF_SLAVE) ||
1909             (slave_dev->master != bond_dev)) {
1910                 return -EINVAL;
1911         }
1912
1913         write_lock_bh(&bond->lock);
1914
1915         old_active = bond->curr_active_slave;
1916         new_active = bond_get_slave_by_dev(bond, slave_dev);
1917
1918         /*
1919          * Changing to the current active: do nothing; return success.
1920          */
1921         if (new_active && (new_active == old_active)) {
1922                 write_unlock_bh(&bond->lock);
1923                 return 0;
1924         }
1925
1926         if ((new_active) &&
1927             (old_active) &&
1928             (new_active->link == BOND_LINK_UP) &&
1929             IS_UP(new_active->dev)) {
1930                 bond_change_active_slave(bond, new_active);
1931         } else {
1932                 res = -EINVAL;
1933         }
1934
1935         write_unlock_bh(&bond->lock);
1936
1937         return res;
1938 }
1939
1940 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1941 {
1942         struct bonding *bond = bond_dev->priv;
1943
1944         info->bond_mode = bond->params.mode;
1945         info->miimon = bond->params.miimon;
1946
1947         read_lock_bh(&bond->lock);
1948         info->num_slaves = bond->slave_cnt;
1949         read_unlock_bh(&bond->lock);
1950
1951         return 0;
1952 }
1953
1954 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1955 {
1956         struct bonding *bond = bond_dev->priv;
1957         struct slave *slave;
1958         int i, found = 0;
1959
1960         if (info->slave_id < 0) {
1961                 return -ENODEV;
1962         }
1963
1964         read_lock_bh(&bond->lock);
1965
1966         bond_for_each_slave(bond, slave, i) {
1967                 if (i == (int)info->slave_id) {
1968                         found = 1;
1969                         break;
1970                 }
1971         }
1972
1973         read_unlock_bh(&bond->lock);
1974
1975         if (found) {
1976                 strcpy(info->slave_name, slave->dev->name);
1977                 info->link = slave->link;
1978                 info->state = slave->state;
1979                 info->link_failure_count = slave->link_failure_count;
1980         } else {
1981                 return -ENODEV;
1982         }
1983
1984         return 0;
1985 }
1986
1987 /*-------------------------------- Monitoring -------------------------------*/
1988
1989 /* this function is called regularly to monitor each slave's link. */
1990 void bond_mii_monitor(struct net_device *bond_dev)
1991 {
1992         struct bonding *bond = bond_dev->priv;
1993         struct slave *slave, *oldcurrent;
1994         int do_failover = 0;
1995         int delta_in_ticks;
1996         int i;
1997
1998         read_lock(&bond->lock);
1999
2000         delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2001
2002         if (bond->kill_timers) {
2003                 goto out;
2004         }
2005
2006         if (bond->slave_cnt == 0) {
2007                 goto re_arm;
2008         }
2009
2010         /* we will try to read the link status of each of our slaves, and
2011          * set their IFF_RUNNING flag appropriately. For each slave not
2012          * supporting MII status, we won't do anything so that a user-space
2013          * program could monitor the link itself if needed.
2014          */
2015
2016         read_lock(&bond->curr_slave_lock);
2017         oldcurrent = bond->curr_active_slave;
2018         read_unlock(&bond->curr_slave_lock);
2019
2020         bond_for_each_slave(bond, slave, i) {
2021                 struct net_device *slave_dev = slave->dev;
2022                 int link_state;
2023                 u16 old_speed = slave->speed;
2024                 u8 old_duplex = slave->duplex;
2025
2026                 link_state = bond_check_dev_link(bond, slave_dev, 0);
2027
2028                 switch (slave->link) {
2029                 case BOND_LINK_UP:      /* the link was up */
2030                         if (link_state == BMSR_LSTATUS) {
2031                                 /* link stays up, nothing more to do */
2032                                 break;
2033                         } else { /* link going down */
2034                                 slave->link  = BOND_LINK_FAIL;
2035                                 slave->delay = bond->params.downdelay;
2036
2037                                 if (slave->link_failure_count < UINT_MAX) {
2038                                         slave->link_failure_count++;
2039                                 }
2040
2041                                 if (bond->params.downdelay) {
2042                                         printk(KERN_INFO DRV_NAME
2043                                                ": %s: link status down for %s "
2044                                                "interface %s, disabling it in "
2045                                                "%d ms.\n",
2046                                                bond_dev->name,
2047                                                IS_UP(slave_dev)
2048                                                ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2049                                                   ? ((slave == oldcurrent)
2050                                                      ? "active " : "backup ")
2051                                                   : "")
2052                                                : "idle ",
2053                                                slave_dev->name,
2054                                                bond->params.downdelay * bond->params.miimon);
2055                                 }
2056                         }
2057                         /* no break ! fall through the BOND_LINK_FAIL test to
2058                            ensure proper action to be taken
2059                         */
2060                 case BOND_LINK_FAIL:    /* the link has just gone down */
2061                         if (link_state != BMSR_LSTATUS) {
2062                                 /* link stays down */
2063                                 if (slave->delay <= 0) {
2064                                         /* link down for too long time */
2065                                         slave->link = BOND_LINK_DOWN;
2066
2067                                         /* in active/backup mode, we must
2068                                          * completely disable this interface
2069                                          */
2070                                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2071                                             (bond->params.mode == BOND_MODE_8023AD)) {
2072                                                 bond_set_slave_inactive_flags(slave);
2073                                         }
2074
2075                                         printk(KERN_INFO DRV_NAME
2076                                                ": %s: link status definitely "
2077                                                "down for interface %s, "
2078                                                "disabling it\n",
2079                                                bond_dev->name,
2080                                                slave_dev->name);
2081
2082                                         /* notify ad that the link status has changed */
2083                                         if (bond->params.mode == BOND_MODE_8023AD) {
2084                                                 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2085                                         }
2086
2087                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2088                                             (bond->params.mode == BOND_MODE_ALB)) {
2089                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2090                                         }
2091
2092                                         if (slave == oldcurrent) {
2093                                                 do_failover = 1;
2094                                         }
2095                                 } else {
2096                                         slave->delay--;
2097                                 }
2098                         } else {
2099                                 /* link up again */
2100                                 slave->link  = BOND_LINK_UP;
2101                                 slave->jiffies = jiffies;
2102                                 printk(KERN_INFO DRV_NAME
2103                                        ": %s: link status up again after %d "
2104                                        "ms for interface %s.\n",
2105                                        bond_dev->name,
2106                                        (bond->params.downdelay - slave->delay) * bond->params.miimon,
2107                                        slave_dev->name);
2108                         }
2109                         break;
2110                 case BOND_LINK_DOWN:    /* the link was down */
2111                         if (link_state != BMSR_LSTATUS) {
2112                                 /* the link stays down, nothing more to do */
2113                                 break;
2114                         } else {        /* link going up */
2115                                 slave->link  = BOND_LINK_BACK;
2116                                 slave->delay = bond->params.updelay;
2117
2118                                 if (bond->params.updelay) {
2119                                         /* if updelay == 0, no need to
2120                                            advertise about a 0 ms delay */
2121                                         printk(KERN_INFO DRV_NAME
2122                                                ": %s: link status up for "
2123                                                "interface %s, enabling it "
2124                                                "in %d ms.\n",
2125                                                bond_dev->name,
2126                                                slave_dev->name,
2127                                                bond->params.updelay * bond->params.miimon);
2128                                 }
2129                         }
2130                         /* no break ! fall through the BOND_LINK_BACK state in
2131                            case there's something to do.
2132                         */
2133                 case BOND_LINK_BACK:    /* the link has just come back */
2134                         if (link_state != BMSR_LSTATUS) {
2135                                 /* link down again */
2136                                 slave->link  = BOND_LINK_DOWN;
2137
2138                                 printk(KERN_INFO DRV_NAME
2139                                        ": %s: link status down again after %d "
2140                                        "ms for interface %s.\n",
2141                                        bond_dev->name,
2142                                        (bond->params.updelay - slave->delay) * bond->params.miimon,
2143                                        slave_dev->name);
2144                         } else {
2145                                 /* link stays up */
2146                                 if (slave->delay == 0) {
2147                                         /* now the link has been up for long time enough */
2148                                         slave->link = BOND_LINK_UP;
2149                                         slave->jiffies = jiffies;
2150
2151                                         if (bond->params.mode == BOND_MODE_8023AD) {
2152                                                 /* prevent it from being the active one */
2153                                                 slave->state = BOND_STATE_BACKUP;
2154                                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2155                                                 /* make it immediately active */
2156                                                 slave->state = BOND_STATE_ACTIVE;
2157                                         } else if (slave != bond->primary_slave) {
2158                                                 /* prevent it from being the active one */
2159                                                 slave->state = BOND_STATE_BACKUP;
2160                                         }
2161
2162                                         printk(KERN_INFO DRV_NAME
2163                                                ": %s: link status definitely "
2164                                                "up for interface %s.\n",
2165                                                bond_dev->name,
2166                                                slave_dev->name);
2167
2168                                         /* notify ad that the link status has changed */
2169                                         if (bond->params.mode == BOND_MODE_8023AD) {
2170                                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2171                                         }
2172
2173                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2174                                             (bond->params.mode == BOND_MODE_ALB)) {
2175                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2176                                         }
2177
2178                                         if ((!oldcurrent) ||
2179                                             (slave == bond->primary_slave)) {
2180                                                 do_failover = 1;
2181                                         }
2182                                 } else {
2183                                         slave->delay--;
2184                                 }
2185                         }
2186                         break;
2187                 default:
2188                         /* Should not happen */
2189                         printk(KERN_ERR DRV_NAME
2190                                ": %s: Error: %s Illegal value (link=%d)\n",
2191                                bond_dev->name,
2192                                slave->dev->name,
2193                                slave->link);
2194                         goto out;
2195                 } /* end of switch (slave->link) */
2196
2197                 bond_update_speed_duplex(slave);
2198
2199                 if (bond->params.mode == BOND_MODE_8023AD) {
2200                         if (old_speed != slave->speed) {
2201                                 bond_3ad_adapter_speed_changed(slave);
2202                         }
2203
2204                         if (old_duplex != slave->duplex) {
2205                                 bond_3ad_adapter_duplex_changed(slave);
2206                         }
2207                 }
2208
2209         } /* end of for */
2210
2211         if (do_failover) {
2212                 write_lock(&bond->curr_slave_lock);
2213
2214                 bond_select_active_slave(bond);
2215
2216                 write_unlock(&bond->curr_slave_lock);
2217         } else
2218                 bond_set_carrier(bond);
2219
2220 re_arm:
2221         if (bond->params.miimon) {
2222                 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2223         }
2224 out:
2225         read_unlock(&bond->lock);
2226 }
2227
2228
2229 static __be32 bond_glean_dev_ip(struct net_device *dev)
2230 {
2231         struct in_device *idev;
2232         struct in_ifaddr *ifa;
2233         __be32 addr = 0;
2234
2235         if (!dev)
2236                 return 0;
2237
2238         rcu_read_lock();
2239         idev = __in_dev_get_rcu(dev);
2240         if (!idev)
2241                 goto out;
2242
2243         ifa = idev->ifa_list;
2244         if (!ifa)
2245                 goto out;
2246
2247         addr = ifa->ifa_local;
2248 out:
2249         rcu_read_unlock();
2250         return addr;
2251 }
2252
2253 static int bond_has_ip(struct bonding *bond)
2254 {
2255         struct vlan_entry *vlan, *vlan_next;
2256
2257         if (bond->master_ip)
2258                 return 1;
2259
2260         if (list_empty(&bond->vlan_list))
2261                 return 0;
2262
2263         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2264                                  vlan_list) {
2265                 if (vlan->vlan_ip)
2266                         return 1;
2267         }
2268
2269         return 0;
2270 }
2271
2272 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2273 {
2274         struct vlan_entry *vlan, *vlan_next;
2275
2276         if (ip == bond->master_ip)
2277                 return 1;
2278
2279         if (list_empty(&bond->vlan_list))
2280                 return 0;
2281
2282         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2283                                  vlan_list) {
2284                 if (ip == vlan->vlan_ip)
2285                         return 1;
2286         }
2287
2288         return 0;
2289 }
2290
2291 /*
2292  * We go to the (large) trouble of VLAN tagging ARP frames because
2293  * switches in VLAN mode (especially if ports are configured as
2294  * "native" to a VLAN) might not pass non-tagged frames.
2295  */
2296 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2297 {
2298         struct sk_buff *skb;
2299
2300         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2301                slave_dev->name, dest_ip, src_ip, vlan_id);
2302
2303         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2304                          NULL, slave_dev->dev_addr, NULL);
2305
2306         if (!skb) {
2307                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2308                 return;
2309         }
2310         if (vlan_id) {
2311                 skb = vlan_put_tag(skb, vlan_id);
2312                 if (!skb) {
2313                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2314                         return;
2315                 }
2316         }
2317         arp_xmit(skb);
2318 }
2319
2320
2321 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2322 {
2323         int i, vlan_id, rv;
2324         __be32 *targets = bond->params.arp_targets;
2325         struct vlan_entry *vlan, *vlan_next;
2326         struct net_device *vlan_dev;
2327         struct flowi fl;
2328         struct rtable *rt;
2329
2330         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2331                 if (!targets[i])
2332                         continue;
2333                 dprintk("basa: target %x\n", targets[i]);
2334                 if (list_empty(&bond->vlan_list)) {
2335                         dprintk("basa: empty vlan: arp_send\n");
2336                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2337                                       bond->master_ip, 0);
2338                         continue;
2339                 }
2340
2341                 /*
2342                  * If VLANs are configured, we do a route lookup to
2343                  * determine which VLAN interface would be used, so we
2344                  * can tag the ARP with the proper VLAN tag.
2345                  */
2346                 memset(&fl, 0, sizeof(fl));
2347                 fl.fl4_dst = targets[i];
2348                 fl.fl4_tos = RTO_ONLINK;
2349
2350                 rv = ip_route_output_key(&rt, &fl);
2351                 if (rv) {
2352                         if (net_ratelimit()) {
2353                                 printk(KERN_WARNING DRV_NAME
2354                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2355                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2356                         }
2357                         continue;
2358                 }
2359
2360                 /*
2361                  * This target is not on a VLAN
2362                  */
2363                 if (rt->u.dst.dev == bond->dev) {
2364                         ip_rt_put(rt);
2365                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2366                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2367                                       bond->master_ip, 0);
2368                         continue;
2369                 }
2370
2371                 vlan_id = 0;
2372                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2373                                          vlan_list) {
2374                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2375                         if (vlan_dev == rt->u.dst.dev) {
2376                                 vlan_id = vlan->vlan_id;
2377                                 dprintk("basa: vlan match on %s %d\n",
2378                                        vlan_dev->name, vlan_id);
2379                                 break;
2380                         }
2381                 }
2382
2383                 if (vlan_id) {
2384                         ip_rt_put(rt);
2385                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2386                                       vlan->vlan_ip, vlan_id);
2387                         continue;
2388                 }
2389
2390                 if (net_ratelimit()) {
2391                         printk(KERN_WARNING DRV_NAME
2392                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2393                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2394                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2395                 }
2396                 ip_rt_put(rt);
2397         }
2398 }
2399
2400 /*
2401  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2402  * for each VLAN above us.
2403  */
2404 static void bond_send_gratuitous_arp(struct bonding *bond)
2405 {
2406         struct slave *slave = bond->curr_active_slave;
2407         struct vlan_entry *vlan;
2408         struct net_device *vlan_dev;
2409
2410         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2411                                 slave ? slave->dev->name : "NULL");
2412         if (!slave)
2413                 return;
2414
2415         if (bond->master_ip) {
2416                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2417                                   bond->master_ip, 0);
2418         }
2419
2420         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2421                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2422                 if (vlan->vlan_ip) {
2423                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2424                                       vlan->vlan_ip, vlan->vlan_id);
2425                 }
2426         }
2427 }
2428
2429 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2430 {
2431         int i;
2432         __be32 *targets = bond->params.arp_targets;
2433
2434         targets = bond->params.arp_targets;
2435         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2436                 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2437                         "%u.%u.%u.%u bhti(tip) %d\n",
2438                        NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2439                        bond_has_this_ip(bond, tip));
2440                 if (sip == targets[i]) {
2441                         if (bond_has_this_ip(bond, tip))
2442                                 slave->last_arp_rx = jiffies;
2443                         return;
2444                 }
2445         }
2446 }
2447
2448 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2449 {
2450         struct arphdr *arp;
2451         struct slave *slave;
2452         struct bonding *bond;
2453         unsigned char *arp_ptr;
2454         __be32 sip, tip;
2455
2456         if (dev->nd_net != &init_net)
2457                 goto out;
2458
2459         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2460                 goto out;
2461
2462         bond = dev->priv;
2463         read_lock(&bond->lock);
2464
2465         dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2466                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2467                 orig_dev ? orig_dev->name : "NULL");
2468
2469         slave = bond_get_slave_by_dev(bond, orig_dev);
2470         if (!slave || !slave_do_arp_validate(bond, slave))
2471                 goto out_unlock;
2472
2473         /* ARP header, plus 2 device addresses, plus 2 IP addresses.  */
2474         if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
2475                                  (2 * dev->addr_len) +
2476                                  (2 * sizeof(u32)))))
2477                 goto out_unlock;
2478
2479         arp = arp_hdr(skb);
2480         if (arp->ar_hln != dev->addr_len ||
2481             skb->pkt_type == PACKET_OTHERHOST ||
2482             skb->pkt_type == PACKET_LOOPBACK ||
2483             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2484             arp->ar_pro != htons(ETH_P_IP) ||
2485             arp->ar_pln != 4)
2486                 goto out_unlock;
2487
2488         arp_ptr = (unsigned char *)(arp + 1);
2489         arp_ptr += dev->addr_len;
2490         memcpy(&sip, arp_ptr, 4);
2491         arp_ptr += 4 + dev->addr_len;
2492         memcpy(&tip, arp_ptr, 4);
2493
2494         dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2495                 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2496                 slave->state, bond->params.arp_validate,
2497                 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2498
2499         /*
2500          * Backup slaves won't see the ARP reply, but do come through
2501          * here for each ARP probe (so we swap the sip/tip to validate
2502          * the probe).  In a "redundant switch, common router" type of
2503          * configuration, the ARP probe will (hopefully) travel from
2504          * the active, through one switch, the router, then the other
2505          * switch before reaching the backup.
2506          */
2507         if (slave->state == BOND_STATE_ACTIVE)
2508                 bond_validate_arp(bond, slave, sip, tip);
2509         else
2510                 bond_validate_arp(bond, slave, tip, sip);
2511
2512 out_unlock:
2513         read_unlock(&bond->lock);
2514 out:
2515         dev_kfree_skb(skb);
2516         return NET_RX_SUCCESS;
2517 }
2518
2519 /*
2520  * this function is called regularly to monitor each slave's link
2521  * ensuring that traffic is being sent and received when arp monitoring
2522  * is used in load-balancing mode. if the adapter has been dormant, then an
2523  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2524  * arp monitoring in active backup mode.
2525  */
2526 void bond_loadbalance_arp_mon(struct net_device *bond_dev)
2527 {
2528         struct bonding *bond = bond_dev->priv;
2529         struct slave *slave, *oldcurrent;
2530         int do_failover = 0;
2531         int delta_in_ticks;
2532         int i;
2533
2534         read_lock(&bond->lock);
2535
2536         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2537
2538         if (bond->kill_timers) {
2539                 goto out;
2540         }
2541
2542         if (bond->slave_cnt == 0) {
2543                 goto re_arm;
2544         }
2545
2546         read_lock(&bond->curr_slave_lock);
2547         oldcurrent = bond->curr_active_slave;
2548         read_unlock(&bond->curr_slave_lock);
2549
2550         /* see if any of the previous devices are up now (i.e. they have
2551          * xmt and rcv traffic). the curr_active_slave does not come into
2552          * the picture unless it is null. also, slave->jiffies is not needed
2553          * here because we send an arp on each slave and give a slave as
2554          * long as it needs to get the tx/rx within the delta.
2555          * TODO: what about up/down delay in arp mode? it wasn't here before
2556          *       so it can wait
2557          */
2558         bond_for_each_slave(bond, slave, i) {
2559                 if (slave->link != BOND_LINK_UP) {
2560                         if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2561                             ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2562
2563                                 slave->link  = BOND_LINK_UP;
2564                                 slave->state = BOND_STATE_ACTIVE;
2565
2566                                 /* primary_slave has no meaning in round-robin
2567                                  * mode. the window of a slave being up and
2568                                  * curr_active_slave being null after enslaving
2569                                  * is closed.
2570                                  */
2571                                 if (!oldcurrent) {
2572                                         printk(KERN_INFO DRV_NAME
2573                                                ": %s: link status definitely "
2574                                                "up for interface %s, ",
2575                                                bond_dev->name,
2576                                                slave->dev->name);
2577                                         do_failover = 1;
2578                                 } else {
2579                                         printk(KERN_INFO DRV_NAME
2580                                                ": %s: interface %s is now up\n",
2581                                                bond_dev->name,
2582                                                slave->dev->name);
2583                                 }
2584                         }
2585                 } else {
2586                         /* slave->link == BOND_LINK_UP */
2587
2588                         /* not all switches will respond to an arp request
2589                          * when the source ip is 0, so don't take the link down
2590                          * if we don't know our ip yet
2591                          */
2592                         if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2593                             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2594                              bond_has_ip(bond))) {
2595
2596                                 slave->link  = BOND_LINK_DOWN;
2597                                 slave->state = BOND_STATE_BACKUP;
2598
2599                                 if (slave->link_failure_count < UINT_MAX) {
2600                                         slave->link_failure_count++;
2601                                 }
2602
2603                                 printk(KERN_INFO DRV_NAME
2604                                        ": %s: interface %s is now down.\n",
2605                                        bond_dev->name,
2606                                        slave->dev->name);
2607
2608                                 if (slave == oldcurrent) {
2609                                         do_failover = 1;
2610                                 }
2611                         }
2612                 }
2613
2614                 /* note: if switch is in round-robin mode, all links
2615                  * must tx arp to ensure all links rx an arp - otherwise
2616                  * links may oscillate or not come up at all; if switch is
2617                  * in something like xor mode, there is nothing we can
2618                  * do - all replies will be rx'ed on same link causing slaves
2619                  * to be unstable during low/no traffic periods
2620                  */
2621                 if (IS_UP(slave->dev)) {
2622                         bond_arp_send_all(bond, slave);
2623                 }
2624         }
2625
2626         if (do_failover) {
2627                 write_lock(&bond->curr_slave_lock);
2628
2629                 bond_select_active_slave(bond);
2630
2631                 write_unlock(&bond->curr_slave_lock);
2632         }
2633
2634 re_arm:
2635         if (bond->params.arp_interval) {
2636                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2637         }
2638 out:
2639         read_unlock(&bond->lock);
2640 }
2641
2642 /*
2643  * When using arp monitoring in active-backup mode, this function is
2644  * called to determine if any backup slaves have went down or a new
2645  * current slave needs to be found.
2646  * The backup slaves never generate traffic, they are considered up by merely
2647  * receiving traffic. If the current slave goes down, each backup slave will
2648  * be given the opportunity to tx/rx an arp before being taken down - this
2649  * prevents all slaves from being taken down due to the current slave not
2650  * sending any traffic for the backups to receive. The arps are not necessarily
2651  * necessary, any tx and rx traffic will keep the current slave up. While any
2652  * rx traffic will keep the backup slaves up, the current slave is responsible
2653  * for generating traffic to keep them up regardless of any other traffic they
2654  * may have received.
2655  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2656  */
2657 void bond_activebackup_arp_mon(struct net_device *bond_dev)
2658 {
2659         struct bonding *bond = bond_dev->priv;
2660         struct slave *slave;
2661         int delta_in_ticks;
2662         int i;
2663
2664         read_lock(&bond->lock);
2665
2666         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2667
2668         if (bond->kill_timers) {
2669                 goto out;
2670         }
2671
2672         if (bond->slave_cnt == 0) {
2673                 goto re_arm;
2674         }
2675
2676         /* determine if any slave has come up or any backup slave has
2677          * gone down
2678          * TODO: what about up/down delay in arp mode? it wasn't here before
2679          *       so it can wait
2680          */
2681         bond_for_each_slave(bond, slave, i) {
2682                 if (slave->link != BOND_LINK_UP) {
2683                         if ((jiffies - slave_last_rx(bond, slave)) <=
2684                              delta_in_ticks) {
2685
2686                                 slave->link = BOND_LINK_UP;
2687
2688                                 write_lock(&bond->curr_slave_lock);
2689
2690                                 if ((!bond->curr_active_slave) &&
2691                                     ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2692                                         bond_change_active_slave(bond, slave);
2693                                         bond->current_arp_slave = NULL;
2694                                 } else if (bond->curr_active_slave != slave) {
2695                                         /* this slave has just come up but we
2696                                          * already have a current slave; this
2697                                          * can also happen if bond_enslave adds
2698                                          * a new slave that is up while we are
2699                                          * searching for a new slave
2700                                          */
2701                                         bond_set_slave_inactive_flags(slave);
2702                                         bond->current_arp_slave = NULL;
2703                                 }
2704
2705                                 bond_set_carrier(bond);
2706
2707                                 if (slave == bond->curr_active_slave) {
2708                                         printk(KERN_INFO DRV_NAME
2709                                                ": %s: %s is up and now the "
2710                                                "active interface\n",
2711                                                bond_dev->name,
2712                                                slave->dev->name);
2713                                         netif_carrier_on(bond->dev);
2714                                 } else {
2715                                         printk(KERN_INFO DRV_NAME
2716                                                ": %s: backup interface %s is "
2717                                                "now up\n",
2718                                                bond_dev->name,
2719                                                slave->dev->name);
2720                                 }
2721
2722                                 write_unlock(&bond->curr_slave_lock);
2723                         }
2724                 } else {
2725                         read_lock(&bond->curr_slave_lock);
2726
2727                         if ((slave != bond->curr_active_slave) &&
2728                             (!bond->current_arp_slave) &&
2729                             (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
2730                              bond_has_ip(bond))) {
2731                                 /* a backup slave has gone down; three times
2732                                  * the delta allows the current slave to be
2733                                  * taken out before the backup slave.
2734                                  * note: a non-null current_arp_slave indicates
2735                                  * the curr_active_slave went down and we are
2736                                  * searching for a new one; under this
2737                                  * condition we only take the curr_active_slave
2738                                  * down - this gives each slave a chance to
2739                                  * tx/rx traffic before being taken out
2740                                  */
2741
2742                                 read_unlock(&bond->curr_slave_lock);
2743
2744                                 slave->link  = BOND_LINK_DOWN;
2745
2746                                 if (slave->link_failure_count < UINT_MAX) {
2747                                         slave->link_failure_count++;
2748                                 }
2749
2750                                 bond_set_slave_inactive_flags(slave);
2751
2752                                 printk(KERN_INFO DRV_NAME
2753                                        ": %s: backup interface %s is now down\n",
2754                                        bond_dev->name,
2755                                        slave->dev->name);
2756                         } else {
2757                                 read_unlock(&bond->curr_slave_lock);
2758                         }
2759                 }
2760         }
2761
2762         read_lock(&bond->curr_slave_lock);
2763         slave = bond->curr_active_slave;
2764         read_unlock(&bond->curr_slave_lock);
2765
2766         if (slave) {
2767                 /* if we have sent traffic in the past 2*arp_intervals but
2768                  * haven't xmit and rx traffic in that time interval, select
2769                  * a different slave. slave->jiffies is only updated when
2770                  * a slave first becomes the curr_active_slave - not necessarily
2771                  * after every arp; this ensures the slave has a full 2*delta
2772                  * before being taken out. if a primary is being used, check
2773                  * if it is up and needs to take over as the curr_active_slave
2774                  */
2775                 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2776             (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
2777              bond_has_ip(bond))) &&
2778                     ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2779
2780                         slave->link  = BOND_LINK_DOWN;
2781
2782                         if (slave->link_failure_count < UINT_MAX) {
2783                                 slave->link_failure_count++;
2784                         }
2785
2786                         printk(KERN_INFO DRV_NAME
2787                                ": %s: link status down for active interface "
2788                                "%s, disabling it\n",
2789                                bond_dev->name,
2790                                slave->dev->name);
2791
2792                         write_lock(&bond->curr_slave_lock);
2793
2794                         bond_select_active_slave(bond);
2795                         slave = bond->curr_active_slave;
2796
2797                         write_unlock(&bond->curr_slave_lock);
2798
2799                         bond->current_arp_slave = slave;
2800
2801                         if (slave) {
2802                                 slave->jiffies = jiffies;
2803                         }
2804                 } else if ((bond->primary_slave) &&
2805                            (bond->primary_slave != slave) &&
2806                            (bond->primary_slave->link == BOND_LINK_UP)) {
2807                         /* at this point, slave is the curr_active_slave */
2808                         printk(KERN_INFO DRV_NAME
2809                                ": %s: changing from interface %s to primary "
2810                                "interface %s\n",
2811                                bond_dev->name,
2812                                slave->dev->name,
2813                                bond->primary_slave->dev->name);
2814
2815                         /* primary is up so switch to it */
2816                         write_lock(&bond->curr_slave_lock);
2817                         bond_change_active_slave(bond, bond->primary_slave);
2818                         write_unlock(&bond->curr_slave_lock);
2819
2820                         slave = bond->primary_slave;
2821                         slave->jiffies = jiffies;
2822                 } else {
2823                         bond->current_arp_slave = NULL;
2824                 }
2825
2826                 /* the current slave must tx an arp to ensure backup slaves
2827                  * rx traffic
2828                  */
2829                 if (slave && bond_has_ip(bond)) {
2830                         bond_arp_send_all(bond, slave);
2831                 }
2832         }
2833
2834         /* if we don't have a curr_active_slave, search for the next available
2835          * backup slave from the current_arp_slave and make it the candidate
2836          * for becoming the curr_active_slave
2837          */
2838         if (!slave) {
2839                 if (!bond->current_arp_slave) {
2840                         bond->current_arp_slave = bond->first_slave;
2841                 }
2842
2843                 if (bond->current_arp_slave) {
2844                         bond_set_slave_inactive_flags(bond->current_arp_slave);
2845
2846                         /* search for next candidate */
2847                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2848                                 if (IS_UP(slave->dev)) {
2849                                         slave->link = BOND_LINK_BACK;
2850                                         bond_set_slave_active_flags(slave);
2851                                         bond_arp_send_all(bond, slave);
2852                                         slave->jiffies = jiffies;
2853                                         bond->current_arp_slave = slave;
2854                                         break;
2855                                 }
2856
2857                                 /* if the link state is up at this point, we
2858                                  * mark it down - this can happen if we have
2859                                  * simultaneous link failures and
2860                                  * reselect_active_interface doesn't make this
2861                                  * one the current slave so it is still marked
2862                                  * up when it is actually down
2863                                  */
2864                                 if (slave->link == BOND_LINK_UP) {
2865                                         slave->link  = BOND_LINK_DOWN;
2866                                         if (slave->link_failure_count < UINT_MAX) {
2867                                                 slave->link_failure_count++;
2868                                         }
2869
2870                                         bond_set_slave_inactive_flags(slave);
2871
2872                                         printk(KERN_INFO DRV_NAME
2873                                                ": %s: backup interface %s is "
2874                                                "now down.\n",
2875                                                bond_dev->name,
2876                                                slave->dev->name);
2877                                 }
2878                         }
2879                 }
2880         }
2881
2882 re_arm:
2883         if (bond->params.arp_interval) {
2884                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2885         }
2886 out:
2887         read_unlock(&bond->lock);
2888 }
2889
2890 /*------------------------------ proc/seq_file-------------------------------*/
2891
2892 #ifdef CONFIG_PROC_FS
2893
2894 #define SEQ_START_TOKEN ((void *)1)
2895
2896 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2897 {
2898         struct bonding *bond = seq->private;
2899         loff_t off = 0;
2900         struct slave *slave;
2901         int i;
2902
2903         /* make sure the bond won't be taken away */
2904         read_lock(&dev_base_lock);
2905         read_lock_bh(&bond->lock);
2906
2907         if (*pos == 0) {
2908                 return SEQ_START_TOKEN;
2909         }
2910
2911         bond_for_each_slave(bond, slave, i) {
2912                 if (++off == *pos) {
2913                         return slave;
2914                 }
2915         }
2916
2917         return NULL;
2918 }
2919
2920 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2921 {
2922         struct bonding *bond = seq->private;
2923         struct slave *slave = v;
2924
2925         ++*pos;
2926         if (v == SEQ_START_TOKEN) {
2927                 return bond->first_slave;
2928         }
2929
2930         slave = slave->next;
2931
2932         return (slave == bond->first_slave) ? NULL : slave;
2933 }
2934
2935 static void bond_info_seq_stop(struct seq_file *seq, void *v)
2936 {
2937         struct bonding *bond = seq->private;
2938
2939         read_unlock_bh(&bond->lock);
2940         read_unlock(&dev_base_lock);
2941 }
2942
2943 static void bond_info_show_master(struct seq_file *seq)
2944 {
2945         struct bonding *bond = seq->private;
2946         struct slave *curr;
2947         int i;
2948         u32 target;
2949
2950         read_lock(&bond->curr_slave_lock);
2951         curr = bond->curr_active_slave;
2952         read_unlock(&bond->curr_slave_lock);
2953
2954         seq_printf(seq, "Bonding Mode: %s\n",
2955                    bond_mode_name(bond->params.mode));
2956
2957         if (bond->params.mode == BOND_MODE_XOR ||
2958                 bond->params.mode == BOND_MODE_8023AD) {
2959                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2960                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2961                         bond->params.xmit_policy);
2962         }
2963
2964         if (USES_PRIMARY(bond->params.mode)) {
2965                 seq_printf(seq, "Primary Slave: %s\n",
2966                            (bond->primary_slave) ?
2967                            bond->primary_slave->dev->name : "None");
2968
2969                 seq_printf(seq, "Currently Active Slave: %s\n",
2970                            (curr) ? curr->dev->name : "None");
2971         }
2972
2973         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
2974                    "up" : "down");
2975         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
2976         seq_printf(seq, "Up Delay (ms): %d\n",
2977                    bond->params.updelay * bond->params.miimon);
2978         seq_printf(seq, "Down Delay (ms): %d\n",
2979                    bond->params.downdelay * bond->params.miimon);
2980
2981
2982         /* ARP information */
2983         if(bond->params.arp_interval > 0) {
2984                 int printed=0;
2985                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
2986                                 bond->params.arp_interval);
2987
2988                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
2989
2990                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
2991                         if (!bond->params.arp_targets[i])
2992                                 continue;
2993                         if (printed)
2994                                 seq_printf(seq, ",");
2995                         target = ntohl(bond->params.arp_targets[i]);
2996                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
2997                         printed = 1;
2998                 }
2999                 seq_printf(seq, "\n");
3000         }
3001
3002         if (bond->params.mode == BOND_MODE_8023AD) {
3003                 struct ad_info ad_info;
3004                 DECLARE_MAC_BUF(mac);
3005
3006                 seq_puts(seq, "\n802.3ad info\n");
3007                 seq_printf(seq, "LACP rate: %s\n",
3008                            (bond->params.lacp_fast) ? "fast" : "slow");
3009
3010                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3011                         seq_printf(seq, "bond %s has no active aggregator\n",
3012                                    bond->dev->name);
3013                 } else {
3014                         seq_printf(seq, "Active Aggregator Info:\n");
3015
3016                         seq_printf(seq, "\tAggregator ID: %d\n",
3017                                    ad_info.aggregator_id);
3018                         seq_printf(seq, "\tNumber of ports: %d\n",
3019                                    ad_info.ports);
3020                         seq_printf(seq, "\tActor Key: %d\n",
3021                                    ad_info.actor_key);
3022                         seq_printf(seq, "\tPartner Key: %d\n",
3023                                    ad_info.partner_key);
3024                         seq_printf(seq, "\tPartner Mac Address: %s\n",
3025                                    print_mac(mac, ad_info.partner_system));
3026                 }
3027         }
3028 }
3029
3030 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3031 {
3032         struct bonding *bond = seq->private;
3033         DECLARE_MAC_BUF(mac);
3034
3035         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3036         seq_printf(seq, "MII Status: %s\n",
3037                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3038         seq_printf(seq, "Link Failure Count: %u\n",
3039                    slave->link_failure_count);
3040
3041         seq_printf(seq,
3042                    "Permanent HW addr: %s\n",
3043                    print_mac(mac, slave->perm_hwaddr));
3044
3045         if (bond->params.mode == BOND_MODE_8023AD) {
3046                 const struct aggregator *agg
3047                         = SLAVE_AD_INFO(slave).port.aggregator;
3048
3049                 if (agg) {
3050                         seq_printf(seq, "Aggregator ID: %d\n",
3051                                    agg->aggregator_identifier);
3052                 } else {
3053                         seq_puts(seq, "Aggregator ID: N/A\n");
3054                 }
3055         }
3056 }
3057
3058 static int bond_info_seq_show(struct seq_file *seq, void *v)
3059 {
3060         if (v == SEQ_START_TOKEN) {
3061                 seq_printf(seq, "%s\n", version);
3062                 bond_info_show_master(seq);
3063         } else {
3064                 bond_info_show_slave(seq, v);
3065         }
3066
3067         return 0;
3068 }
3069
3070 static struct seq_operations bond_info_seq_ops = {
3071         .start = bond_info_seq_start,
3072         .next  = bond_info_seq_next,
3073         .stop  = bond_info_seq_stop,
3074         .show  = bond_info_seq_show,
3075 };
3076
3077 static int bond_info_open(struct inode *inode, struct file *file)
3078 {
3079         struct seq_file *seq;
3080         struct proc_dir_entry *proc;
3081         int res;
3082
3083         res = seq_open(file, &bond_info_seq_ops);
3084         if (!res) {
3085                 /* recover the pointer buried in proc_dir_entry data */
3086                 seq = file->private_data;
3087                 proc = PDE(inode);
3088                 seq->private = proc->data;
3089         }
3090
3091         return res;
3092 }
3093
3094 static const struct file_operations bond_info_fops = {
3095         .owner   = THIS_MODULE,
3096         .open    = bond_info_open,
3097         .read    = seq_read,
3098         .llseek  = seq_lseek,
3099         .release = seq_release,
3100 };
3101
3102 static int bond_create_proc_entry(struct bonding *bond)
3103 {
3104         struct net_device *bond_dev = bond->dev;
3105
3106         if (bond_proc_dir) {
3107                 bond->proc_entry = create_proc_entry(bond_dev->name,
3108                                                      S_IRUGO,
3109                                                      bond_proc_dir);
3110                 if (bond->proc_entry == NULL) {
3111                         printk(KERN_WARNING DRV_NAME
3112                                ": Warning: Cannot create /proc/net/%s/%s\n",
3113                                DRV_NAME, bond_dev->name);
3114                 } else {
3115                         bond->proc_entry->data = bond;
3116                         bond->proc_entry->proc_fops = &bond_info_fops;
3117                         bond->proc_entry->owner = THIS_MODULE;
3118                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3119                 }
3120         }
3121
3122         return 0;
3123 }
3124
3125 static void bond_remove_proc_entry(struct bonding *bond)
3126 {
3127         if (bond_proc_dir && bond->proc_entry) {
3128                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3129                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3130                 bond->proc_entry = NULL;
3131         }
3132 }
3133
3134 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3135  * Caller must hold rtnl_lock.
3136  */
3137 static void bond_create_proc_dir(void)
3138 {
3139         int len = strlen(DRV_NAME);
3140
3141         for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
3142              bond_proc_dir = bond_proc_dir->next) {
3143                 if ((bond_proc_dir->namelen == len) &&
3144                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3145                         break;
3146                 }
3147         }
3148
3149         if (!bond_proc_dir) {
3150                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3151                 if (bond_proc_dir) {
3152                         bond_proc_dir->owner = THIS_MODULE;
3153                 } else {
3154                         printk(KERN_WARNING DRV_NAME
3155                                 ": Warning: cannot create /proc/net/%s\n",
3156                                 DRV_NAME);
3157                 }
3158         }
3159 }
3160
3161 /* Destroy the bonding directory under /proc/net, if empty.
3162  * Caller must hold rtnl_lock.
3163  */
3164 static void bond_destroy_proc_dir(void)
3165 {
3166         struct proc_dir_entry *de;
3167
3168         if (!bond_proc_dir) {
3169                 return;
3170         }
3171
3172         /* verify that the /proc dir is empty */
3173         for (de = bond_proc_dir->subdir; de; de = de->next) {
3174                 /* ignore . and .. */
3175                 if (*(de->name) != '.') {
3176                         break;
3177                 }
3178         }
3179
3180         if (de) {
3181                 if (bond_proc_dir->owner == THIS_MODULE) {
3182                         bond_proc_dir->owner = NULL;
3183                 }
3184         } else {
3185                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3186                 bond_proc_dir = NULL;
3187         }
3188 }
3189 #endif /* CONFIG_PROC_FS */
3190
3191 /*-------------------------- netdev event handling --------------------------*/
3192
3193 /*
3194  * Change device name
3195  */
3196 static int bond_event_changename(struct bonding *bond)
3197 {
3198 #ifdef CONFIG_PROC_FS
3199         bond_remove_proc_entry(bond);
3200         bond_create_proc_entry(bond);
3201 #endif
3202         down_write(&(bonding_rwsem));
3203         bond_destroy_sysfs_entry(bond);
3204         bond_create_sysfs_entry(bond);
3205         up_write(&(bonding_rwsem));
3206         return NOTIFY_DONE;
3207 }
3208
3209 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3210 {
3211         struct bonding *event_bond = bond_dev->priv;
3212
3213         switch (event) {
3214         case NETDEV_CHANGENAME:
3215                 return bond_event_changename(event_bond);
3216         case NETDEV_UNREGISTER:
3217                 /*
3218                  * TODO: remove a bond from the list?
3219                  */
3220                 break;
3221         default:
3222                 break;
3223         }
3224
3225         return NOTIFY_DONE;
3226 }
3227
3228 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3229 {
3230         struct net_device *bond_dev = slave_dev->master;
3231         struct bonding *bond = bond_dev->priv;
3232
3233         switch (event) {
3234         case NETDEV_UNREGISTER:
3235                 if (bond_dev) {
3236                         bond_release(bond_dev, slave_dev);
3237                 }
3238                 break;
3239         case NETDEV_CHANGE:
3240                 /*
3241                  * TODO: is this what we get if somebody
3242                  * sets up a hierarchical bond, then rmmod's
3243                  * one of the slave bonding devices?
3244                  */
3245                 break;
3246         case NETDEV_DOWN:
3247                 /*
3248                  * ... Or is it this?
3249                  */
3250                 break;
3251         case NETDEV_CHANGEMTU:
3252                 /*
3253                  * TODO: Should slaves be allowed to
3254                  * independently alter their MTU?  For
3255                  * an active-backup bond, slaves need
3256                  * not be the same type of device, so
3257                  * MTUs may vary.  For other modes,
3258                  * slaves arguably should have the
3259                  * same MTUs. To do this, we'd need to
3260                  * take over the slave's change_mtu
3261                  * function for the duration of their
3262                  * servitude.
3263                  */
3264                 break;
3265         case NETDEV_CHANGENAME:
3266                 /*
3267                  * TODO: handle changing the primary's name
3268                  */
3269                 break;
3270         case NETDEV_FEAT_CHANGE:
3271                 bond_compute_features(bond);
3272                 break;
3273         default:
3274                 break;
3275         }
3276
3277         return NOTIFY_DONE;
3278 }
3279
3280 /*
3281  * bond_netdev_event: handle netdev notifier chain events.
3282  *
3283  * This function receives events for the netdev chain.  The caller (an
3284  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3285  * locks for us to safely manipulate the slave devices (RTNL lock,
3286  * dev_probe_lock).
3287  */
3288 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3289 {
3290         struct net_device *event_dev = (struct net_device *)ptr;
3291
3292         if (event_dev->nd_net != &init_net)
3293                 return NOTIFY_DONE;
3294
3295         dprintk("event_dev: %s, event: %lx\n",
3296                 (event_dev ? event_dev->name : "None"),
3297                 event);
3298
3299         if (!(event_dev->priv_flags & IFF_BONDING))
3300                 return NOTIFY_DONE;
3301
3302         if (event_dev->flags & IFF_MASTER) {
3303                 dprintk("IFF_MASTER\n");
3304                 return bond_master_netdev_event(event, event_dev);
3305         }
3306
3307         if (event_dev->flags & IFF_SLAVE) {
3308                 dprintk("IFF_SLAVE\n");
3309                 return bond_slave_netdev_event(event, event_dev);
3310         }
3311
3312         return NOTIFY_DONE;
3313 }
3314
3315 /*
3316  * bond_inetaddr_event: handle inetaddr notifier chain events.
3317  *
3318  * We keep track of device IPs primarily to use as source addresses in
3319  * ARP monitor probes (rather than spewing out broadcasts all the time).
3320  *
3321  * We track one IP for the main device (if it has one), plus one per VLAN.
3322  */
3323 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3324 {
3325         struct in_ifaddr *ifa = ptr;
3326         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3327         struct bonding *bond, *bond_next;
3328         struct vlan_entry *vlan, *vlan_next;
3329
3330         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3331                 if (bond->dev == event_dev) {
3332                         switch (event) {
3333                         case NETDEV_UP:
3334                                 bond->master_ip = ifa->ifa_local;
3335                                 return NOTIFY_OK;
3336                         case NETDEV_DOWN:
3337                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3338                                 return NOTIFY_OK;
3339                         default:
3340                                 return NOTIFY_DONE;
3341                         }
3342                 }
3343
3344                 if (list_empty(&bond->vlan_list))
3345                         continue;
3346
3347                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3348                                          vlan_list) {
3349                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3350                         if (vlan_dev == event_dev) {
3351                                 switch (event) {
3352                                 case NETDEV_UP:
3353                                         vlan->vlan_ip = ifa->ifa_local;
3354                                         return NOTIFY_OK;
3355                                 case NETDEV_DOWN:
3356                                         vlan->vlan_ip =
3357                                                 bond_glean_dev_ip(vlan_dev);
3358                                         return NOTIFY_OK;
3359                                 default:
3360                                         return NOTIFY_DONE;
3361                                 }
3362                         }
3363                 }
3364         }
3365         return NOTIFY_DONE;
3366 }
3367
3368 static struct notifier_block bond_netdev_notifier = {
3369         .notifier_call = bond_netdev_event,
3370 };
3371
3372 static struct notifier_block bond_inetaddr_notifier = {
3373         .notifier_call = bond_inetaddr_event,
3374 };
3375
3376 /*-------------------------- Packet type handling ---------------------------*/
3377
3378 /* register to receive lacpdus on a bond */
3379 static void bond_register_lacpdu(struct bonding *bond)
3380 {
3381         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3382
3383         /* initialize packet type */
3384         pk_type->type = PKT_TYPE_LACPDU;
3385         pk_type->dev = bond->dev;
3386         pk_type->func = bond_3ad_lacpdu_recv;
3387
3388         dev_add_pack(pk_type);
3389 }
3390
3391 /* unregister to receive lacpdus on a bond */
3392 static void bond_unregister_lacpdu(struct bonding *bond)
3393 {
3394         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3395 }
3396
3397 void bond_register_arp(struct bonding *bond)
3398 {
3399         struct packet_type *pt = &bond->arp_mon_pt;
3400
3401         if (pt->type)
3402                 return;
3403
3404         pt->type = htons(ETH_P_ARP);
3405         pt->dev = bond->dev;
3406         pt->func = bond_arp_rcv;
3407         dev_add_pack(pt);
3408 }
3409
3410 void bond_unregister_arp(struct bonding *bond)
3411 {
3412         struct packet_type *pt = &bond->arp_mon_pt;
3413
3414         dev_remove_pack(pt);
3415         pt->type = 0;
3416 }
3417
3418 /*---------------------------- Hashing Policies -----------------------------*/
3419
3420 /*
3421  * Hash for the output device based upon layer 3 and layer 4 data. If
3422  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3423  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3424  */
3425 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3426                                     struct net_device *bond_dev, int count)
3427 {
3428         struct ethhdr *data = (struct ethhdr *)skb->data;
3429         struct iphdr *iph = ip_hdr(skb);
3430         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3431         int layer4_xor = 0;
3432
3433         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3434                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3435                     (iph->protocol == IPPROTO_TCP ||
3436                      iph->protocol == IPPROTO_UDP)) {
3437                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3438                 }
3439                 return (layer4_xor ^
3440                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3441
3442         }
3443
3444         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3445 }
3446
3447 /*
3448  * Hash for the output device based upon layer 2 data
3449  */
3450 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3451                                    struct net_device *bond_dev, int count)
3452 {
3453         struct ethhdr *data = (struct ethhdr *)skb->data;
3454
3455         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3456 }
3457
3458 /*-------------------------- Device entry points ----------------------------*/
3459
3460 static int bond_open(struct net_device *bond_dev)
3461 {
3462         struct bonding *bond = bond_dev->priv;
3463         struct timer_list *mii_timer = &bond->mii_timer;
3464         struct timer_list *arp_timer = &bond->arp_timer;
3465
3466         bond->kill_timers = 0;
3467
3468         if ((bond->params.mode == BOND_MODE_TLB) ||
3469             (bond->params.mode == BOND_MODE_ALB)) {
3470                 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3471
3472                 /* bond_alb_initialize must be called before the timer
3473                  * is started.
3474                  */
3475                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3476                         /* something went wrong - fail the open operation */
3477                         return -1;
3478                 }
3479
3480                 init_timer(alb_timer);
3481                 alb_timer->expires  = jiffies + 1;
3482                 alb_timer->data     = (unsigned long)bond;
3483                 alb_timer->function = (void *)&bond_alb_monitor;
3484                 add_timer(alb_timer);
3485         }
3486
3487         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3488                 init_timer(mii_timer);
3489                 mii_timer->expires  = jiffies + 1;
3490                 mii_timer->data     = (unsigned long)bond_dev;
3491                 mii_timer->function = (void *)&bond_mii_monitor;
3492                 add_timer(mii_timer);
3493         }
3494
3495         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3496                 init_timer(arp_timer);
3497                 arp_timer->expires  = jiffies + 1;
3498                 arp_timer->data     = (unsigned long)bond_dev;
3499                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3500                         arp_timer->function = (void *)&bond_activebackup_arp_mon;
3501                 } else {
3502                         arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3503                 }
3504                 if (bond->params.arp_validate)
3505                         bond_register_arp(bond);
3506
3507                 add_timer(arp_timer);
3508         }
3509
3510         if (bond->params.mode == BOND_MODE_8023AD) {
3511                 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3512                 init_timer(ad_timer);
3513                 ad_timer->expires  = jiffies + 1;
3514                 ad_timer->data     = (unsigned long)bond;
3515                 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3516                 add_timer(ad_timer);
3517
3518                 /* register to receive LACPDUs */
3519                 bond_register_lacpdu(bond);
3520         }
3521
3522         return 0;
3523 }
3524
3525 static int bond_close(struct net_device *bond_dev)
3526 {
3527         struct bonding *bond = bond_dev->priv;
3528
3529         if (bond->params.mode == BOND_MODE_8023AD) {
3530                 /* Unregister the receive of LACPDUs */
3531                 bond_unregister_lacpdu(bond);
3532         }
3533
3534         if (bond->params.arp_validate)
3535                 bond_unregister_arp(bond);
3536
3537         write_lock_bh(&bond->lock);
3538
3539
3540         /* signal timers not to re-arm */
3541         bond->kill_timers = 1;
3542
3543         write_unlock_bh(&bond->lock);
3544
3545         /* del_timer_sync must run without holding the bond->lock
3546          * because a running timer might be trying to hold it too
3547          */
3548
3549         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3550                 del_timer_sync(&bond->mii_timer);
3551         }
3552
3553         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3554                 del_timer_sync(&bond->arp_timer);
3555         }
3556
3557         switch (bond->params.mode) {
3558         case BOND_MODE_8023AD:
3559                 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3560                 break;
3561         case BOND_MODE_TLB:
3562         case BOND_MODE_ALB:
3563                 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3564                 break;
3565         default:
3566                 break;
3567         }
3568
3569
3570         if ((bond->params.mode == BOND_MODE_TLB) ||
3571             (bond->params.mode == BOND_MODE_ALB)) {
3572                 /* Must be called only after all
3573                  * slaves have been released
3574                  */
3575                 bond_alb_deinitialize(bond);
3576         }
3577
3578         return 0;
3579 }
3580
3581 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3582 {
3583         struct bonding *bond = bond_dev->priv;
3584         struct net_device_stats *stats = &(bond->stats), *sstats;
3585         struct slave *slave;
3586         int i;
3587
3588         memset(stats, 0, sizeof(struct net_device_stats));
3589
3590         read_lock_bh(&bond->lock);
3591
3592         bond_for_each_slave(bond, slave, i) {
3593                 sstats = slave->dev->get_stats(slave->dev);
3594                 stats->rx_packets += sstats->rx_packets;
3595                 stats->rx_bytes += sstats->rx_bytes;
3596                 stats->rx_errors += sstats->rx_errors;
3597                 stats->rx_dropped += sstats->rx_dropped;
3598
3599                 stats->tx_packets += sstats->tx_packets;
3600                 stats->tx_bytes += sstats->tx_bytes;
3601                 stats->tx_errors += sstats->tx_errors;
3602                 stats->tx_dropped += sstats->tx_dropped;
3603
3604                 stats->multicast += sstats->multicast;
3605                 stats->collisions += sstats->collisions;
3606
3607                 stats->rx_length_errors += sstats->rx_length_errors;
3608                 stats->rx_over_errors += sstats->rx_over_errors;
3609                 stats->rx_crc_errors += sstats->rx_crc_errors;
3610                 stats->rx_frame_errors += sstats->rx_frame_errors;
3611                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3612                 stats->rx_missed_errors += sstats->rx_missed_errors;
3613
3614                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3615                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3616                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3617                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3618                 stats->tx_window_errors += sstats->tx_window_errors;
3619         }
3620
3621         read_unlock_bh(&bond->lock);
3622
3623         return stats;
3624 }
3625
3626 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3627 {
3628         struct net_device *slave_dev = NULL;
3629         struct ifbond k_binfo;
3630         struct ifbond __user *u_binfo = NULL;
3631         struct ifslave k_sinfo;
3632         struct ifslave __user *u_sinfo = NULL;
3633         struct mii_ioctl_data *mii = NULL;
3634         int res = 0;
3635
3636         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3637                 bond_dev->name, cmd);
3638
3639         switch (cmd) {
3640         case SIOCGMIIPHY:
3641                 mii = if_mii(ifr);
3642                 if (!mii) {
3643                         return -EINVAL;
3644                 }
3645                 mii->phy_id = 0;
3646                 /* Fall Through */
3647         case SIOCGMIIREG:
3648                 /*
3649                  * We do this again just in case we were called by SIOCGMIIREG
3650                  * instead of SIOCGMIIPHY.
3651                  */
3652                 mii = if_mii(ifr);
3653                 if (!mii) {
3654                         return -EINVAL;
3655                 }
3656
3657                 if (mii->reg_num == 1) {
3658                         struct bonding *bond = bond_dev->priv;
3659                         mii->val_out = 0;
3660                         read_lock_bh(&bond->lock);
3661                         read_lock(&bond->curr_slave_lock);
3662                         if (netif_carrier_ok(bond->dev)) {
3663                                 mii->val_out = BMSR_LSTATUS;
3664                         }
3665                         read_unlock(&bond->curr_slave_lock);
3666                         read_unlock_bh(&bond->lock);
3667                 }
3668
3669                 return 0;
3670         case BOND_INFO_QUERY_OLD:
3671         case SIOCBONDINFOQUERY:
3672                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3673
3674                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3675                         return -EFAULT;
3676                 }
3677
3678                 res = bond_info_query(bond_dev, &k_binfo);
3679                 if (res == 0) {
3680                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3681                                 return -EFAULT;
3682                         }
3683                 }
3684
3685                 return res;
3686         case BOND_SLAVE_INFO_QUERY_OLD:
3687         case SIOCBONDSLAVEINFOQUERY:
3688                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3689
3690                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3691                         return -EFAULT;
3692                 }
3693
3694                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3695                 if (res == 0) {
3696                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3697                                 return -EFAULT;
3698                         }
3699                 }
3700
3701                 return res;
3702         default:
3703                 /* Go on */
3704                 break;
3705         }
3706
3707         if (!capable(CAP_NET_ADMIN)) {
3708                 return -EPERM;
3709         }
3710
3711         down_write(&(bonding_rwsem));
3712         slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
3713
3714         dprintk("slave_dev=%p: \n", slave_dev);
3715
3716         if (!slave_dev) {
3717                 res = -ENODEV;
3718         } else {
3719                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3720                 switch (cmd) {
3721                 case BOND_ENSLAVE_OLD:
3722                 case SIOCBONDENSLAVE:
3723                         res = bond_enslave(bond_dev, slave_dev);
3724                         break;
3725                 case BOND_RELEASE_OLD:
3726                 case SIOCBONDRELEASE:
3727                         res = bond_release(bond_dev, slave_dev);
3728                         break;
3729                 case BOND_SETHWADDR_OLD:
3730                 case SIOCBONDSETHWADDR:
3731                         res = bond_sethwaddr(bond_dev, slave_dev);
3732                         break;
3733                 case BOND_CHANGE_ACTIVE_OLD:
3734                 case SIOCBONDCHANGEACTIVE:
3735                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3736                         break;
3737                 default:
3738                         res = -EOPNOTSUPP;
3739                 }
3740
3741                 dev_put(slave_dev);
3742         }
3743
3744         up_write(&(bonding_rwsem));
3745         return res;
3746 }
3747
3748 static void bond_set_multicast_list(struct net_device *bond_dev)
3749 {
3750         struct bonding *bond = bond_dev->priv;
3751         struct dev_mc_list *dmi;
3752
3753         write_lock_bh(&bond->lock);
3754
3755         /*
3756          * Do promisc before checking multicast_mode
3757          */
3758         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3759                 bond_set_promiscuity(bond, 1);
3760         }
3761
3762         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3763                 bond_set_promiscuity(bond, -1);
3764         }
3765
3766         /* set allmulti flag to slaves */
3767         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3768                 bond_set_allmulti(bond, 1);
3769         }
3770
3771         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3772                 bond_set_allmulti(bond, -1);
3773         }
3774
3775         bond->flags = bond_dev->flags;
3776
3777         /* looking for addresses to add to slaves' mc list */
3778         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3779                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3780                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3781                 }
3782         }
3783
3784         /* looking for addresses to delete from slaves' list */
3785         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3786                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3787                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3788                 }
3789         }
3790
3791         /* save master's multicast list */
3792         bond_mc_list_destroy(bond);
3793         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3794
3795         write_unlock_bh(&bond->lock);
3796 }
3797
3798 /*
3799  * Change the MTU of all of a master's slaves to match the master
3800  */
3801 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3802 {
3803         struct bonding *bond = bond_dev->priv;
3804         struct slave *slave, *stop_at;
3805         int res = 0;
3806         int i;
3807
3808         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3809                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3810
3811         /* Can't hold bond->lock with bh disabled here since
3812          * some base drivers panic. On the other hand we can't
3813          * hold bond->lock without bh disabled because we'll
3814          * deadlock. The only solution is to rely on the fact
3815          * that we're under rtnl_lock here, and the slaves
3816          * list won't change. This doesn't solve the problem
3817          * of setting the slave's MTU while it is
3818          * transmitting, but the assumption is that the base
3819          * driver can handle that.
3820          *
3821          * TODO: figure out a way to safely iterate the slaves
3822          * list, but without holding a lock around the actual
3823          * call to the base driver.
3824          */
3825
3826         bond_for_each_slave(bond, slave, i) {
3827                 dprintk("s %p s->p %p c_m %p\n", slave,
3828                         slave->prev, slave->dev->change_mtu);
3829
3830                 res = dev_set_mtu(slave->dev, new_mtu);
3831
3832                 if (res) {
3833                         /* If we failed to set the slave's mtu to the new value
3834                          * we must abort the operation even in ACTIVE_BACKUP
3835                          * mode, because if we allow the backup slaves to have
3836                          * different mtu values than the active slave we'll
3837                          * need to change their mtu when doing a failover. That
3838                          * means changing their mtu from timer context, which
3839                          * is probably not a good idea.
3840                          */
3841                         dprintk("err %d %s\n", res, slave->dev->name);
3842                         goto unwind;
3843                 }
3844         }
3845
3846         bond_dev->mtu = new_mtu;
3847
3848         return 0;
3849
3850 unwind:
3851         /* unwind from head to the slave that failed */
3852         stop_at = slave;
3853         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3854                 int tmp_res;
3855
3856                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3857                 if (tmp_res) {
3858                         dprintk("unwind err %d dev %s\n", tmp_res,
3859                                 slave->dev->name);
3860                 }
3861         }
3862
3863         return res;
3864 }
3865
3866 /*
3867  * Change HW address
3868  *
3869  * Note that many devices must be down to change the HW address, and
3870  * downing the master releases all slaves.  We can make bonds full of
3871  * bonding devices to test this, however.
3872  */
3873 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3874 {
3875         struct bonding *bond = bond_dev->priv;
3876         struct sockaddr *sa = addr, tmp_sa;
3877         struct slave *slave, *stop_at;
3878         int res = 0;
3879         int i;
3880
3881         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3882
3883         if (!is_valid_ether_addr(sa->sa_data)) {
3884                 return -EADDRNOTAVAIL;
3885         }
3886
3887         /* Can't hold bond->lock with bh disabled here since
3888          * some base drivers panic. On the other hand we can't
3889          * hold bond->lock without bh disabled because we'll
3890          * deadlock. The only solution is to rely on the fact
3891          * that we're under rtnl_lock here, and the slaves
3892          * list won't change. This doesn't solve the problem
3893          * of setting the slave's hw address while it is
3894          * transmitting, but the assumption is that the base
3895          * driver can handle that.
3896          *
3897          * TODO: figure out a way to safely iterate the slaves
3898          * list, but without holding a lock around the actual
3899          * call to the base driver.
3900          */
3901
3902         bond_for_each_slave(bond, slave, i) {
3903                 dprintk("slave %p %s\n", slave, slave->dev->name);
3904
3905                 if (slave->dev->set_mac_address == NULL) {
3906                         res = -EOPNOTSUPP;
3907                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3908                         goto unwind;
3909                 }
3910
3911                 res = dev_set_mac_address(slave->dev, addr);
3912                 if (res) {
3913                         /* TODO: consider downing the slave
3914                          * and retry ?
3915                          * User should expect communications
3916                          * breakage anyway until ARP finish
3917                          * updating, so...
3918                          */
3919                         dprintk("err %d %s\n", res, slave->dev->name);
3920                         goto unwind;
3921                 }
3922         }
3923
3924         /* success */
3925         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3926         return 0;
3927
3928 unwind:
3929         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3930         tmp_sa.sa_family = bond_dev->type;
3931
3932         /* unwind from head to the slave that failed */
3933         stop_at = slave;
3934         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3935                 int tmp_res;
3936
3937                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3938                 if (tmp_res) {
3939                         dprintk("unwind err %d dev %s\n", tmp_res,
3940                                 slave->dev->name);
3941                 }
3942         }
3943
3944         return res;
3945 }
3946
3947 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3948 {
3949         struct bonding *bond = bond_dev->priv;
3950         struct slave *slave, *start_at;
3951         int i;
3952         int res = 1;
3953
3954         read_lock(&bond->lock);
3955
3956         if (!BOND_IS_OK(bond)) {
3957                 goto out;
3958         }
3959
3960         read_lock(&bond->curr_slave_lock);
3961         slave = start_at = bond->curr_active_slave;
3962         read_unlock(&bond->curr_slave_lock);
3963
3964         if (!slave) {
3965                 goto out;
3966         }
3967
3968         bond_for_each_slave_from(bond, slave, i, start_at) {
3969                 if (IS_UP(slave->dev) &&
3970                     (slave->link == BOND_LINK_UP) &&
3971                     (slave->state == BOND_STATE_ACTIVE)) {
3972                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3973
3974                         write_lock(&bond->curr_slave_lock);
3975                         bond->curr_active_slave = slave->next;
3976                         write_unlock(&bond->curr_slave_lock);
3977
3978                         break;
3979                 }
3980         }
3981
3982
3983 out:
3984         if (res) {
3985                 /* no suitable interface, frame not sent */
3986                 dev_kfree_skb(skb);
3987         }
3988         read_unlock(&bond->lock);
3989         return 0;
3990 }
3991
3992
3993 /*
3994  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3995  * the bond has a usable interface.
3996  */
3997 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3998 {
3999         struct bonding *bond = bond_dev->priv;
4000         int res = 1;
4001
4002         read_lock(&bond->lock);
4003         read_lock(&bond->curr_slave_lock);
4004
4005         if (!BOND_IS_OK(bond)) {
4006                 goto out;
4007         }
4008
4009         if (!bond->curr_active_slave)
4010                 goto out;
4011
4012         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4013
4014 out:
4015         if (res) {
4016                 /* no suitable interface, frame not sent */
4017                 dev_kfree_skb(skb);
4018         }
4019         read_unlock(&bond->curr_slave_lock);
4020         read_unlock(&bond->lock);
4021         return 0;
4022 }
4023
4024 /*
4025  * In bond_xmit_xor() , we determine the output device by using a pre-
4026  * determined xmit_hash_policy(), If the selected device is not enabled,
4027  * find the next active slave.
4028  */
4029 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4030 {
4031         struct bonding *bond = bond_dev->priv;
4032         struct slave *slave, *start_at;
4033         int slave_no;
4034         int i;
4035         int res = 1;
4036
4037         read_lock(&bond->lock);
4038
4039         if (!BOND_IS_OK(bond)) {
4040                 goto out;
4041         }
4042
4043         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4044
4045         bond_for_each_slave(bond, slave, i) {
4046                 slave_no--;
4047                 if (slave_no < 0) {
4048                         break;
4049                 }
4050         }
4051
4052         start_at = slave;
4053
4054         bond_for_each_slave_from(bond, slave, i, start_at) {
4055                 if (IS_UP(slave->dev) &&
4056                     (slave->link == BOND_LINK_UP) &&
4057                     (slave->state == BOND_STATE_ACTIVE)) {
4058                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4059                         break;
4060                 }
4061         }
4062
4063 out:
4064         if (res) {
4065                 /* no suitable interface, frame not sent */
4066                 dev_kfree_skb(skb);
4067         }
4068         read_unlock(&bond->lock);
4069         return 0;
4070 }
4071
4072 /*
4073  * in broadcast mode, we send everything to all usable interfaces.
4074  */
4075 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4076 {
4077         struct bonding *bond = bond_dev->priv;
4078         struct slave *slave, *start_at;
4079         struct net_device *tx_dev = NULL;
4080         int i;
4081         int res = 1;
4082
4083         read_lock(&bond->lock);
4084
4085         if (!BOND_IS_OK(bond)) {
4086                 goto out;
4087         }
4088
4089         read_lock(&bond->curr_slave_lock);
4090         start_at = bond->curr_active_slave;
4091         read_unlock(&bond->curr_slave_lock);
4092
4093         if (!start_at) {
4094                 goto out;
4095         }
4096
4097         bond_for_each_slave_from(bond, slave, i, start_at) {
4098                 if (IS_UP(slave->dev) &&
4099                     (slave->link == BOND_LINK_UP) &&
4100                     (slave->state == BOND_STATE_ACTIVE)) {
4101                         if (tx_dev) {
4102                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4103                                 if (!skb2) {
4104                                         printk(KERN_ERR DRV_NAME
4105                                                ": %s: Error: bond_xmit_broadcast(): "
4106                                                "skb_clone() failed\n",
4107                                                bond_dev->name);
4108                                         continue;
4109                                 }
4110
4111                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4112                                 if (res) {
4113                                         dev_kfree_skb(skb2);
4114                                         continue;
4115                                 }
4116                         }
4117                         tx_dev = slave->dev;
4118                 }
4119         }
4120
4121         if (tx_dev) {
4122                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4123         }
4124
4125 out:
4126         if (res) {
4127                 /* no suitable interface, frame not sent */
4128                 dev_kfree_skb(skb);
4129         }
4130         /* frame sent to all suitable interfaces */
4131         read_unlock(&bond->lock);
4132         return 0;
4133 }
4134
4135 /*------------------------- Device initialization ---------------------------*/
4136
4137 /*
4138  * set bond mode specific net device operations
4139  */
4140 void bond_set_mode_ops(struct bonding *bond, int mode)
4141 {
4142         struct net_device *bond_dev = bond->dev;
4143
4144         switch (mode) {
4145         case BOND_MODE_ROUNDROBIN:
4146                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4147                 break;
4148         case BOND_MODE_ACTIVEBACKUP:
4149                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4150                 break;
4151         case BOND_MODE_XOR:
4152                 bond_dev->hard_start_xmit = bond_xmit_xor;
4153                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4154                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4155                 else
4156                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4157                 break;
4158         case BOND_MODE_BROADCAST:
4159                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4160                 break;
4161         case BOND_MODE_8023AD:
4162                 bond_set_master_3ad_flags(bond);
4163                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4164                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4165                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4166                 else
4167                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4168                 break;
4169         case BOND_MODE_ALB:
4170                 bond_set_master_alb_flags(bond);
4171                 /* FALLTHRU */
4172         case BOND_MODE_TLB:
4173                 bond_dev->hard_start_xmit = bond_alb_xmit;
4174                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4175                 break;
4176         default:
4177                 /* Should never happen, mode already checked */
4178                 printk(KERN_ERR DRV_NAME
4179                        ": %s: Error: Unknown bonding mode %d\n",
4180                        bond_dev->name,
4181                        mode);
4182                 break;
4183         }
4184 }
4185
4186 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4187                                     struct ethtool_drvinfo *drvinfo)
4188 {
4189         strncpy(drvinfo->driver, DRV_NAME, 32);
4190         strncpy(drvinfo->version, DRV_VERSION, 32);
4191         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4192 }
4193
4194 static const struct ethtool_ops bond_ethtool_ops = {
4195         .get_drvinfo            = bond_ethtool_get_drvinfo,
4196 };
4197
4198 /*
4199  * Does not allocate but creates a /proc entry.
4200  * Allowed to fail.
4201  */
4202 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4203 {
4204         struct bonding *bond = bond_dev->priv;
4205
4206         dprintk("Begin bond_init for %s\n", bond_dev->name);
4207
4208         /* initialize rwlocks */
4209         rwlock_init(&bond->lock);
4210         rwlock_init(&bond->curr_slave_lock);
4211
4212         bond->params = *params; /* copy params struct */
4213
4214         /* Initialize pointers */
4215         bond->first_slave = NULL;
4216         bond->curr_active_slave = NULL;
4217         bond->current_arp_slave = NULL;
4218         bond->primary_slave = NULL;
4219         bond->dev = bond_dev;
4220         INIT_LIST_HEAD(&bond->vlan_list);
4221
4222         /* Initialize the device entry points */
4223         bond_dev->open = bond_open;
4224         bond_dev->stop = bond_close;
4225         bond_dev->get_stats = bond_get_stats;
4226         bond_dev->do_ioctl = bond_do_ioctl;
4227         bond_dev->ethtool_ops = &bond_ethtool_ops;
4228         bond_dev->set_multicast_list = bond_set_multicast_list;
4229         bond_dev->change_mtu = bond_change_mtu;
4230         bond_dev->set_mac_address = bond_set_mac_address;
4231
4232         bond_set_mode_ops(bond, bond->params.mode);
4233
4234         bond_dev->destructor = free_netdev;
4235
4236         /* Initialize the device options */
4237         bond_dev->tx_queue_len = 0;
4238         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4239         bond_dev->priv_flags |= IFF_BONDING;
4240
4241         /* At first, we block adding VLANs. That's the only way to
4242          * prevent problems that occur when adding VLANs over an
4243          * empty bond. The block will be removed once non-challenged
4244          * slaves are enslaved.
4245          */
4246         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4247
4248         /* don't acquire bond device's netif_tx_lock when
4249          * transmitting */
4250         bond_dev->features |= NETIF_F_LLTX;
4251
4252         /* By default, we declare the bond to be fully
4253          * VLAN hardware accelerated capable. Special
4254          * care is taken in the various xmit functions
4255          * when there are slaves that are not hw accel
4256          * capable
4257          */
4258         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4259         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4260         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4261         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4262                                NETIF_F_HW_VLAN_RX |
4263                                NETIF_F_HW_VLAN_FILTER);
4264
4265 #ifdef CONFIG_PROC_FS
4266         bond_create_proc_entry(bond);
4267 #endif
4268
4269         list_add_tail(&bond->bond_list, &bond_dev_list);
4270
4271         return 0;
4272 }
4273
4274 /* De-initialize device specific data.
4275  * Caller must hold rtnl_lock.
4276  */
4277 void bond_deinit(struct net_device *bond_dev)
4278 {
4279         struct bonding *bond = bond_dev->priv;
4280
4281         list_del(&bond->bond_list);
4282
4283 #ifdef CONFIG_PROC_FS
4284         bond_remove_proc_entry(bond);
4285 #endif
4286 }
4287
4288 /* Unregister and free all bond devices.
4289  * Caller must hold rtnl_lock.
4290  */
4291 static void bond_free_all(void)
4292 {
4293         struct bonding *bond, *nxt;
4294
4295         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4296                 struct net_device *bond_dev = bond->dev;
4297
4298                 bond_mc_list_destroy(bond);
4299                 /* Release the bonded slaves */
4300                 bond_release_all(bond_dev);
4301                 bond_deinit(bond_dev);
4302                 unregister_netdevice(bond_dev);
4303         }
4304
4305 #ifdef CONFIG_PROC_FS
4306         bond_destroy_proc_dir();
4307 #endif
4308 }
4309
4310 /*------------------------- Module initialization ---------------------------*/
4311
4312 /*
4313  * Convert string input module parms.  Accept either the
4314  * number of the mode or its string name.
4315  */
4316 int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
4317 {
4318         int i;
4319
4320         for (i = 0; tbl[i].modename; i++) {
4321                 if ((isdigit(*mode_arg) &&
4322                      tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4323                     (strncmp(mode_arg, tbl[i].modename,
4324                              strlen(tbl[i].modename)) == 0)) {
4325                         return tbl[i].mode;
4326                 }
4327         }
4328
4329         return -1;
4330 }
4331
4332 static int bond_check_params(struct bond_params *params)
4333 {
4334         int arp_validate_value;
4335
4336         /*
4337          * Convert string parameters.
4338          */
4339         if (mode) {
4340                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4341                 if (bond_mode == -1) {
4342                         printk(KERN_ERR DRV_NAME
4343                                ": Error: Invalid bonding mode \"%s\"\n",
4344                                mode == NULL ? "NULL" : mode);
4345                         return -EINVAL;
4346                 }
4347         }
4348
4349         if (xmit_hash_policy) {
4350                 if ((bond_mode != BOND_MODE_XOR) &&
4351                     (bond_mode != BOND_MODE_8023AD)) {
4352                         printk(KERN_INFO DRV_NAME
4353                                ": xor_mode param is irrelevant in mode %s\n",
4354                                bond_mode_name(bond_mode));
4355                 } else {
4356                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4357                                                         xmit_hashtype_tbl);
4358                         if (xmit_hashtype == -1) {
4359                                 printk(KERN_ERR DRV_NAME
4360                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4361                                 xmit_hash_policy == NULL ? "NULL" :
4362                                        xmit_hash_policy);
4363                                 return -EINVAL;
4364                         }
4365                 }
4366         }
4367
4368         if (lacp_rate) {
4369                 if (bond_mode != BOND_MODE_8023AD) {
4370                         printk(KERN_INFO DRV_NAME
4371                                ": lacp_rate param is irrelevant in mode %s\n",
4372                                bond_mode_name(bond_mode));
4373                 } else {
4374                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4375                         if (lacp_fast == -1) {
4376                                 printk(KERN_ERR DRV_NAME
4377                                        ": Error: Invalid lacp rate \"%s\"\n",
4378                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4379                                 return -EINVAL;
4380                         }
4381                 }
4382         }
4383
4384         if (max_bonds < 1 || max_bonds > INT_MAX) {
4385                 printk(KERN_WARNING DRV_NAME
4386                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4387                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4388                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4389                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4390         }
4391
4392         if (miimon < 0) {
4393                 printk(KERN_WARNING DRV_NAME
4394                        ": Warning: miimon module parameter (%d), "
4395                        "not in range 0-%d, so it was reset to %d\n",
4396                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4397                 miimon = BOND_LINK_MON_INTERV;
4398         }
4399
4400         if (updelay < 0) {
4401                 printk(KERN_WARNING DRV_NAME
4402                        ": Warning: updelay module parameter (%d), "
4403                        "not in range 0-%d, so it was reset to 0\n",
4404                        updelay, INT_MAX);
4405                 updelay = 0;
4406         }
4407
4408         if (downdelay < 0) {
4409                 printk(KERN_WARNING DRV_NAME
4410                        ": Warning: downdelay module parameter (%d), "
4411                        "not in range 0-%d, so it was reset to 0\n",
4412                        downdelay, INT_MAX);
4413                 downdelay = 0;
4414         }
4415
4416         if ((use_carrier != 0) && (use_carrier != 1)) {
4417                 printk(KERN_WARNING DRV_NAME
4418                        ": Warning: use_carrier module parameter (%d), "
4419                        "not of valid value (0/1), so it was set to 1\n",
4420                        use_carrier);
4421                 use_carrier = 1;
4422         }
4423
4424         /* reset values for 802.3ad */
4425         if (bond_mode == BOND_MODE_8023AD) {
4426                 if (!miimon) {
4427                         printk(KERN_WARNING DRV_NAME
4428                                ": Warning: miimon must be specified, "
4429                                "otherwise bonding will not detect link "
4430                                "failure, speed and duplex which are "
4431                                "essential for 802.3ad operation\n");
4432                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4433                         miimon = 100;
4434                 }
4435         }
4436
4437         /* reset values for TLB/ALB */
4438         if ((bond_mode == BOND_MODE_TLB) ||
4439             (bond_mode == BOND_MODE_ALB)) {
4440                 if (!miimon) {
4441                         printk(KERN_WARNING DRV_NAME
4442                                ": Warning: miimon must be specified, "
4443                                "otherwise bonding will not detect link "
4444                                "failure and link speed which are essential "
4445                                "for TLB/ALB load balancing\n");
4446                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4447                         miimon = 100;
4448                 }
4449         }
4450
4451         if (bond_mode == BOND_MODE_ALB) {
4452                 printk(KERN_NOTICE DRV_NAME
4453                        ": In ALB mode you might experience client "
4454                        "disconnections upon reconnection of a link if the "
4455                        "bonding module updelay parameter (%d msec) is "
4456                        "incompatible with the forwarding delay time of the "
4457                        "switch\n",
4458                        updelay);
4459         }
4460
4461         if (!miimon) {
4462                 if (updelay || downdelay) {
4463                         /* just warn the user the up/down delay will have
4464                          * no effect since miimon is zero...
4465                          */
4466                         printk(KERN_WARNING DRV_NAME
4467                                ": Warning: miimon module parameter not set "
4468                                "and updelay (%d) or downdelay (%d) module "
4469                                "parameter is set; updelay and downdelay have "
4470                                "no effect unless miimon is set\n",
4471                                updelay, downdelay);
4472                 }
4473         } else {
4474                 /* don't allow arp monitoring */
4475                 if (arp_interval) {
4476                         printk(KERN_WARNING DRV_NAME
4477                                ": Warning: miimon (%d) and arp_interval (%d) "
4478                                "can't be used simultaneously, disabling ARP "
4479                                "monitoring\n",
4480                                miimon, arp_interval);
4481                         arp_interval = 0;
4482                 }
4483
4484                 if ((updelay % miimon) != 0) {
4485                         printk(KERN_WARNING DRV_NAME
4486                                ": Warning: updelay (%d) is not a multiple "
4487                                "of miimon (%d), updelay rounded to %d ms\n",
4488                                updelay, miimon, (updelay / miimon) * miimon);
4489                 }
4490
4491                 updelay /= miimon;
4492
4493                 if ((downdelay % miimon) != 0) {
4494                         printk(KERN_WARNING DRV_NAME
4495                                ": Warning: downdelay (%d) is not a multiple "
4496                                "of miimon (%d), downdelay rounded to %d ms\n",
4497                                downdelay, miimon,
4498                                (downdelay / miimon) * miimon);
4499                 }
4500
4501                 downdelay /= miimon;
4502         }
4503
4504         if (arp_interval < 0) {
4505                 printk(KERN_WARNING DRV_NAME
4506                        ": Warning: arp_interval module parameter (%d) "
4507                        ", not in range 0-%d, so it was reset to %d\n",
4508                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4509                 arp_interval = BOND_LINK_ARP_INTERV;
4510         }
4511
4512         for (arp_ip_count = 0;
4513              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4514              arp_ip_count++) {
4515                 /* not complete check, but should be good enough to
4516                    catch mistakes */
4517                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4518                         printk(KERN_WARNING DRV_NAME
4519                                ": Warning: bad arp_ip_target module parameter "
4520                                "(%s), ARP monitoring will not be performed\n",
4521                                arp_ip_target[arp_ip_count]);
4522                         arp_interval = 0;
4523                 } else {
4524                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4525                         arp_target[arp_ip_count] = ip;
4526                 }
4527         }
4528
4529         if (arp_interval && !arp_ip_count) {
4530                 /* don't allow arping if no arp_ip_target given... */
4531                 printk(KERN_WARNING DRV_NAME
4532                        ": Warning: arp_interval module parameter (%d) "
4533                        "specified without providing an arp_ip_target "
4534                        "parameter, arp_interval was reset to 0\n",
4535                        arp_interval);
4536                 arp_interval = 0;
4537         }
4538
4539         if (arp_validate) {
4540                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4541                         printk(KERN_ERR DRV_NAME
4542                ": arp_validate only supported in active-backup mode\n");
4543                         return -EINVAL;
4544                 }
4545                 if (!arp_interval) {
4546                         printk(KERN_ERR DRV_NAME
4547                                ": arp_validate requires arp_interval\n");
4548                         return -EINVAL;
4549                 }
4550
4551                 arp_validate_value = bond_parse_parm(arp_validate,
4552                                                      arp_validate_tbl);
4553                 if (arp_validate_value == -1) {
4554                         printk(KERN_ERR DRV_NAME
4555                                ": Error: invalid arp_validate \"%s\"\n",
4556                                arp_validate == NULL ? "NULL" : arp_validate);
4557                         return -EINVAL;
4558                 }
4559         } else
4560                 arp_validate_value = 0;
4561
4562         if (miimon) {
4563                 printk(KERN_INFO DRV_NAME
4564                        ": MII link monitoring set to %d ms\n",
4565                        miimon);
4566         } else if (arp_interval) {
4567                 int i;
4568
4569                 printk(KERN_INFO DRV_NAME
4570                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4571                        arp_interval,
4572                        arp_validate_tbl[arp_validate_value].modename,
4573                        arp_ip_count);
4574
4575                 for (i = 0; i < arp_ip_count; i++)
4576                         printk (" %s", arp_ip_target[i]);
4577
4578                 printk("\n");
4579
4580         } else {
4581                 /* miimon and arp_interval not set, we need one so things
4582                  * work as expected, see bonding.txt for details
4583                  */
4584                 printk(KERN_WARNING DRV_NAME
4585                        ": Warning: either miimon or arp_interval and "
4586                        "arp_ip_target module parameters must be specified, "
4587                        "otherwise bonding will not detect link failures! see "
4588                        "bonding.txt for details.\n");
4589         }
4590
4591         if (primary && !USES_PRIMARY(bond_mode)) {
4592                 /* currently, using a primary only makes sense
4593                  * in active backup, TLB or ALB modes
4594                  */
4595                 printk(KERN_WARNING DRV_NAME
4596                        ": Warning: %s primary device specified but has no "
4597                        "effect in %s mode\n",
4598                        primary, bond_mode_name(bond_mode));
4599                 primary = NULL;
4600         }
4601
4602         /* fill params struct with the proper values */
4603         params->mode = bond_mode;
4604         params->xmit_policy = xmit_hashtype;
4605         params->miimon = miimon;
4606         params->arp_interval = arp_interval;
4607         params->arp_validate = arp_validate_value;
4608         params->updelay = updelay;
4609         params->downdelay = downdelay;
4610         params->use_carrier = use_carrier;
4611         params->lacp_fast = lacp_fast;
4612         params->primary[0] = 0;
4613
4614         if (primary) {
4615                 strncpy(params->primary, primary, IFNAMSIZ);
4616                 params->primary[IFNAMSIZ - 1] = 0;
4617         }
4618
4619         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4620
4621         return 0;
4622 }
4623
4624 static struct lock_class_key bonding_netdev_xmit_lock_key;
4625
4626 /* Create a new bond based on the specified name and bonding parameters.
4627  * If name is NULL, obtain a suitable "bond%d" name for us.
4628  * Caller must NOT hold rtnl_lock; we need to release it here before we
4629  * set up our sysfs entries.
4630  */
4631 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4632 {
4633         struct net_device *bond_dev;
4634         int res;
4635
4636         rtnl_lock();
4637         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4638                                 ether_setup);
4639         if (!bond_dev) {
4640                 printk(KERN_ERR DRV_NAME
4641                        ": %s: eek! can't alloc netdev!\n",
4642                        name);
4643                 res = -ENOMEM;
4644                 goto out_rtnl;
4645         }
4646
4647         if (!name) {
4648                 res = dev_alloc_name(bond_dev, "bond%d");
4649                 if (res < 0)
4650                         goto out_netdev;
4651         }
4652
4653         /* bond_init() must be called after dev_alloc_name() (for the
4654          * /proc files), but before register_netdevice(), because we
4655          * need to set function pointers.
4656          */
4657
4658         res = bond_init(bond_dev, params);
4659         if (res < 0) {
4660                 goto out_netdev;
4661         }
4662
4663         res = register_netdevice(bond_dev);
4664         if (res < 0) {
4665                 goto out_bond;
4666         }
4667
4668         lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4669
4670         if (newbond)
4671                 *newbond = bond_dev->priv;
4672
4673         netif_carrier_off(bond_dev);
4674
4675         rtnl_unlock(); /* allows sysfs registration of net device */
4676         res = bond_create_sysfs_entry(bond_dev->priv);
4677         if (res < 0) {
4678                 rtnl_lock();
4679                 goto out_bond;
4680         }
4681
4682         return 0;
4683
4684 out_bond:
4685         bond_deinit(bond_dev);
4686 out_netdev:
4687         free_netdev(bond_dev);
4688 out_rtnl:
4689         rtnl_unlock();
4690         return res;
4691 }
4692
4693 static int __init bonding_init(void)
4694 {
4695         int i;
4696         int res;
4697
4698         printk(KERN_INFO "%s", version);
4699
4700         res = bond_check_params(&bonding_defaults);
4701         if (res) {
4702                 goto out;
4703         }
4704
4705 #ifdef CONFIG_PROC_FS
4706         bond_create_proc_dir();
4707 #endif
4708         for (i = 0; i < max_bonds; i++) {
4709                 res = bond_create(NULL, &bonding_defaults, NULL);
4710                 if (res)
4711                         goto err;
4712         }
4713
4714         res = bond_create_sysfs();
4715         if (res)
4716                 goto err;
4717
4718         register_netdevice_notifier(&bond_netdev_notifier);
4719         register_inetaddr_notifier(&bond_inetaddr_notifier);
4720
4721         goto out;
4722 err:
4723         rtnl_lock();
4724         bond_free_all();
4725         bond_destroy_sysfs();
4726         rtnl_unlock();
4727 out:
4728         return res;
4729
4730 }
4731
4732 static void __exit bonding_exit(void)
4733 {
4734         unregister_netdevice_notifier(&bond_netdev_notifier);
4735         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4736
4737         rtnl_lock();
4738         bond_free_all();
4739         bond_destroy_sysfs();
4740         rtnl_unlock();
4741 }
4742
4743 module_init(bonding_init);
4744 module_exit(bonding_exit);
4745 MODULE_LICENSE("GPL");
4746 MODULE_VERSION(DRV_VERSION);
4747 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4748 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4749 MODULE_SUPPORTED_DEVICE("most ethernet devices");
4750
4751 /*
4752  * Local variables:
4753  *  c-indent-level: 8
4754  *  c-basic-offset: 8
4755  *  tab-width: 8
4756  * End:
4757  */
4758