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 u32 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
1608         /* slave is not a slave or master is not master of this slave */
1609         if (!(slave_dev->flags & IFF_SLAVE) ||
1610             (slave_dev->master != bond_dev)) {
1611                 printk(KERN_ERR DRV_NAME
1612                        ": %s: Error: cannot release %s.\n",
1613                        bond_dev->name, slave_dev->name);
1614                 return -EINVAL;
1615         }
1616
1617         write_lock_bh(&bond->lock);
1618
1619         slave = bond_get_slave_by_dev(bond, slave_dev);
1620         if (!slave) {
1621                 /* not a slave of this bond */
1622                 printk(KERN_INFO DRV_NAME
1623                        ": %s: %s not enslaved\n",
1624                        bond_dev->name, slave_dev->name);
1625                 write_unlock_bh(&bond->lock);
1626                 return -EINVAL;
1627         }
1628
1629         mac_addr_differ = memcmp(bond_dev->dev_addr,
1630                                  slave->perm_hwaddr,
1631                                  ETH_ALEN);
1632         if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1633                 printk(KERN_WARNING DRV_NAME
1634                        ": %s: Warning: the permanent HWaddr of %s "
1635                        "- %02X:%02X:%02X:%02X:%02X:%02X - is "
1636                        "still in use by %s. Set the HWaddr of "
1637                        "%s to a different address to avoid "
1638                        "conflicts.\n",
1639                        bond_dev->name,
1640                        slave_dev->name,
1641                        slave->perm_hwaddr[0],
1642                        slave->perm_hwaddr[1],
1643                        slave->perm_hwaddr[2],
1644                        slave->perm_hwaddr[3],
1645                        slave->perm_hwaddr[4],
1646                        slave->perm_hwaddr[5],
1647                        bond_dev->name,
1648                        slave_dev->name);
1649         }
1650
1651         /* Inform AD package of unbinding of slave. */
1652         if (bond->params.mode == BOND_MODE_8023AD) {
1653                 /* must be called before the slave is
1654                  * detached from the list
1655                  */
1656                 bond_3ad_unbind_slave(slave);
1657         }
1658
1659         printk(KERN_INFO DRV_NAME
1660                ": %s: releasing %s interface %s\n",
1661                bond_dev->name,
1662                (slave->state == BOND_STATE_ACTIVE)
1663                ? "active" : "backup",
1664                slave_dev->name);
1665
1666         oldcurrent = bond->curr_active_slave;
1667
1668         bond->current_arp_slave = NULL;
1669
1670         /* release the slave from its bond */
1671         bond_detach_slave(bond, slave);
1672
1673         bond_compute_features(bond);
1674
1675         if (bond->primary_slave == slave) {
1676                 bond->primary_slave = NULL;
1677         }
1678
1679         if (oldcurrent == slave) {
1680                 bond_change_active_slave(bond, NULL);
1681         }
1682
1683         if ((bond->params.mode == BOND_MODE_TLB) ||
1684             (bond->params.mode == BOND_MODE_ALB)) {
1685                 /* Must be called only after the slave has been
1686                  * detached from the list and the curr_active_slave
1687                  * has been cleared (if our_slave == old_current),
1688                  * but before a new active slave is selected.
1689                  */
1690                 bond_alb_deinit_slave(bond, slave);
1691         }
1692
1693         if (oldcurrent == slave)
1694                 bond_select_active_slave(bond);
1695
1696         if (bond->slave_cnt == 0) {
1697                 bond_set_carrier(bond);
1698
1699                 /* if the last slave was removed, zero the mac address
1700                  * of the master so it will be set by the application
1701                  * to the mac address of the first slave
1702                  */
1703                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1704
1705                 if (list_empty(&bond->vlan_list)) {
1706                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1707                 } else {
1708                         printk(KERN_WARNING DRV_NAME
1709                                ": %s: Warning: clearing HW address of %s while it "
1710                                "still has VLANs.\n",
1711                                bond_dev->name, bond_dev->name);
1712                         printk(KERN_WARNING DRV_NAME
1713                                ": %s: When re-adding slaves, make sure the bond's "
1714                                "HW address matches its VLANs'.\n",
1715                                bond_dev->name);
1716                 }
1717         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1718                    !bond_has_challenged_slaves(bond)) {
1719                 printk(KERN_INFO DRV_NAME
1720                        ": %s: last VLAN challenged slave %s "
1721                        "left bond %s. VLAN blocking is removed\n",
1722                        bond_dev->name, slave_dev->name, bond_dev->name);
1723                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1724         }
1725
1726         write_unlock_bh(&bond->lock);
1727
1728         /* must do this from outside any spinlocks */
1729         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1730
1731         bond_del_vlans_from_slave(bond, slave_dev);
1732
1733         /* If the mode USES_PRIMARY, then we should only remove its
1734          * promisc and mc settings if it was the curr_active_slave, but that was
1735          * already taken care of above when we detached the slave
1736          */
1737         if (!USES_PRIMARY(bond->params.mode)) {
1738                 /* unset promiscuity level from slave */
1739                 if (bond_dev->flags & IFF_PROMISC) {
1740                         dev_set_promiscuity(slave_dev, -1);
1741                 }
1742
1743                 /* unset allmulti level from slave */
1744                 if (bond_dev->flags & IFF_ALLMULTI) {
1745                         dev_set_allmulti(slave_dev, -1);
1746                 }
1747
1748                 /* flush master's mc_list from slave */
1749                 bond_mc_list_flush(bond_dev, slave_dev);
1750         }
1751
1752         netdev_set_master(slave_dev, NULL);
1753
1754         /* close slave before restoring its mac address */
1755         dev_close(slave_dev);
1756
1757         /* restore original ("permanent") mac address */
1758         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1759         addr.sa_family = slave_dev->type;
1760         dev_set_mac_address(slave_dev, &addr);
1761
1762         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1763                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1764                                    IFF_SLAVE_NEEDARP);
1765
1766         kfree(slave);
1767
1768         return 0;  /* deletion OK */
1769 }
1770
1771 /*
1772  * This function releases all slaves.
1773  */
1774 static int bond_release_all(struct net_device *bond_dev)
1775 {
1776         struct bonding *bond = bond_dev->priv;
1777         struct slave *slave;
1778         struct net_device *slave_dev;
1779         struct sockaddr addr;
1780
1781         write_lock_bh(&bond->lock);
1782
1783         netif_carrier_off(bond_dev);
1784
1785         if (bond->slave_cnt == 0) {
1786                 goto out;
1787         }
1788
1789         bond->current_arp_slave = NULL;
1790         bond->primary_slave = NULL;
1791         bond_change_active_slave(bond, NULL);
1792
1793         while ((slave = bond->first_slave) != NULL) {
1794                 /* Inform AD package of unbinding of slave
1795                  * before slave is detached from the list.
1796                  */
1797                 if (bond->params.mode == BOND_MODE_8023AD) {
1798                         bond_3ad_unbind_slave(slave);
1799                 }
1800
1801                 slave_dev = slave->dev;
1802                 bond_detach_slave(bond, slave);
1803
1804                 if ((bond->params.mode == BOND_MODE_TLB) ||
1805                     (bond->params.mode == BOND_MODE_ALB)) {
1806                         /* must be called only after the slave
1807                          * has been detached from the list
1808                          */
1809                         bond_alb_deinit_slave(bond, slave);
1810                 }
1811
1812                 bond_compute_features(bond);
1813
1814                 /* now that the slave is detached, unlock and perform
1815                  * all the undo steps that should not be called from
1816                  * within a lock.
1817                  */
1818                 write_unlock_bh(&bond->lock);
1819
1820                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1821                 bond_del_vlans_from_slave(bond, slave_dev);
1822
1823                 /* If the mode USES_PRIMARY, then we should only remove its
1824                  * promisc and mc settings if it was the curr_active_slave, but that was
1825                  * already taken care of above when we detached the slave
1826                  */
1827                 if (!USES_PRIMARY(bond->params.mode)) {
1828                         /* unset promiscuity level from slave */
1829                         if (bond_dev->flags & IFF_PROMISC) {
1830                                 dev_set_promiscuity(slave_dev, -1);
1831                         }
1832
1833                         /* unset allmulti level from slave */
1834                         if (bond_dev->flags & IFF_ALLMULTI) {
1835                                 dev_set_allmulti(slave_dev, -1);
1836                         }
1837
1838                         /* flush master's mc_list from slave */
1839                         bond_mc_list_flush(bond_dev, slave_dev);
1840                 }
1841
1842                 netdev_set_master(slave_dev, NULL);
1843
1844                 /* close slave before restoring its mac address */
1845                 dev_close(slave_dev);
1846
1847                 /* restore original ("permanent") mac address*/
1848                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1849                 addr.sa_family = slave_dev->type;
1850                 dev_set_mac_address(slave_dev, &addr);
1851
1852                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1853                                            IFF_SLAVE_INACTIVE);
1854
1855                 kfree(slave);
1856
1857                 /* re-acquire the lock before getting the next slave */
1858                 write_lock_bh(&bond->lock);
1859         }
1860
1861         /* zero the mac address of the master so it will be
1862          * set by the application to the mac address of the
1863          * first slave
1864          */
1865         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1866
1867         if (list_empty(&bond->vlan_list)) {
1868                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1869         } else {
1870                 printk(KERN_WARNING DRV_NAME
1871                        ": %s: Warning: clearing HW address of %s while it "
1872                        "still has VLANs.\n",
1873                        bond_dev->name, bond_dev->name);
1874                 printk(KERN_WARNING DRV_NAME
1875                        ": %s: When re-adding slaves, make sure the bond's "
1876                        "HW address matches its VLANs'.\n",
1877                        bond_dev->name);
1878         }
1879
1880         printk(KERN_INFO DRV_NAME
1881                ": %s: released all slaves\n",
1882                bond_dev->name);
1883
1884 out:
1885         write_unlock_bh(&bond->lock);
1886
1887         return 0;
1888 }
1889
1890 /*
1891  * This function changes the active slave to slave <slave_dev>.
1892  * It returns -EINVAL in the following cases.
1893  *  - <slave_dev> is not found in the list.
1894  *  - There is not active slave now.
1895  *  - <slave_dev> is already active.
1896  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1897  *  - <slave_dev> is not running.
1898  * In these cases, this fuction does nothing.
1899  * In the other cases, currnt_slave pointer is changed and 0 is returned.
1900  */
1901 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1902 {
1903         struct bonding *bond = bond_dev->priv;
1904         struct slave *old_active = NULL;
1905         struct slave *new_active = NULL;
1906         int res = 0;
1907
1908         if (!USES_PRIMARY(bond->params.mode)) {
1909                 return -EINVAL;
1910         }
1911
1912         /* Verify that master_dev is indeed the master of slave_dev */
1913         if (!(slave_dev->flags & IFF_SLAVE) ||
1914             (slave_dev->master != bond_dev)) {
1915                 return -EINVAL;
1916         }
1917
1918         write_lock_bh(&bond->lock);
1919
1920         old_active = bond->curr_active_slave;
1921         new_active = bond_get_slave_by_dev(bond, slave_dev);
1922
1923         /*
1924          * Changing to the current active: do nothing; return success.
1925          */
1926         if (new_active && (new_active == old_active)) {
1927                 write_unlock_bh(&bond->lock);
1928                 return 0;
1929         }
1930
1931         if ((new_active) &&
1932             (old_active) &&
1933             (new_active->link == BOND_LINK_UP) &&
1934             IS_UP(new_active->dev)) {
1935                 bond_change_active_slave(bond, new_active);
1936         } else {
1937                 res = -EINVAL;
1938         }
1939
1940         write_unlock_bh(&bond->lock);
1941
1942         return res;
1943 }
1944
1945 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1946 {
1947         struct bonding *bond = bond_dev->priv;
1948
1949         info->bond_mode = bond->params.mode;
1950         info->miimon = bond->params.miimon;
1951
1952         read_lock_bh(&bond->lock);
1953         info->num_slaves = bond->slave_cnt;
1954         read_unlock_bh(&bond->lock);
1955
1956         return 0;
1957 }
1958
1959 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1960 {
1961         struct bonding *bond = bond_dev->priv;
1962         struct slave *slave;
1963         int i, found = 0;
1964
1965         if (info->slave_id < 0) {
1966                 return -ENODEV;
1967         }
1968
1969         read_lock_bh(&bond->lock);
1970
1971         bond_for_each_slave(bond, slave, i) {
1972                 if (i == (int)info->slave_id) {
1973                         found = 1;
1974                         break;
1975                 }
1976         }
1977
1978         read_unlock_bh(&bond->lock);
1979
1980         if (found) {
1981                 strcpy(info->slave_name, slave->dev->name);
1982                 info->link = slave->link;
1983                 info->state = slave->state;
1984                 info->link_failure_count = slave->link_failure_count;
1985         } else {
1986                 return -ENODEV;
1987         }
1988
1989         return 0;
1990 }
1991
1992 /*-------------------------------- Monitoring -------------------------------*/
1993
1994 /* this function is called regularly to monitor each slave's link. */
1995 void bond_mii_monitor(struct net_device *bond_dev)
1996 {
1997         struct bonding *bond = bond_dev->priv;
1998         struct slave *slave, *oldcurrent;
1999         int do_failover = 0;
2000         int delta_in_ticks;
2001         int i;
2002
2003         read_lock(&bond->lock);
2004
2005         delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2006
2007         if (bond->kill_timers) {
2008                 goto out;
2009         }
2010
2011         if (bond->slave_cnt == 0) {
2012                 goto re_arm;
2013         }
2014
2015         /* we will try to read the link status of each of our slaves, and
2016          * set their IFF_RUNNING flag appropriately. For each slave not
2017          * supporting MII status, we won't do anything so that a user-space
2018          * program could monitor the link itself if needed.
2019          */
2020
2021         read_lock(&bond->curr_slave_lock);
2022         oldcurrent = bond->curr_active_slave;
2023         read_unlock(&bond->curr_slave_lock);
2024
2025         bond_for_each_slave(bond, slave, i) {
2026                 struct net_device *slave_dev = slave->dev;
2027                 int link_state;
2028                 u16 old_speed = slave->speed;
2029                 u8 old_duplex = slave->duplex;
2030
2031                 link_state = bond_check_dev_link(bond, slave_dev, 0);
2032
2033                 switch (slave->link) {
2034                 case BOND_LINK_UP:      /* the link was up */
2035                         if (link_state == BMSR_LSTATUS) {
2036                                 /* link stays up, nothing more to do */
2037                                 break;
2038                         } else { /* link going down */
2039                                 slave->link  = BOND_LINK_FAIL;
2040                                 slave->delay = bond->params.downdelay;
2041
2042                                 if (slave->link_failure_count < UINT_MAX) {
2043                                         slave->link_failure_count++;
2044                                 }
2045
2046                                 if (bond->params.downdelay) {
2047                                         printk(KERN_INFO DRV_NAME
2048                                                ": %s: link status down for %s "
2049                                                "interface %s, disabling it in "
2050                                                "%d ms.\n",
2051                                                bond_dev->name,
2052                                                IS_UP(slave_dev)
2053                                                ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2054                                                   ? ((slave == oldcurrent)
2055                                                      ? "active " : "backup ")
2056                                                   : "")
2057                                                : "idle ",
2058                                                slave_dev->name,
2059                                                bond->params.downdelay * bond->params.miimon);
2060                                 }
2061                         }
2062                         /* no break ! fall through the BOND_LINK_FAIL test to
2063                            ensure proper action to be taken
2064                         */
2065                 case BOND_LINK_FAIL:    /* the link has just gone down */
2066                         if (link_state != BMSR_LSTATUS) {
2067                                 /* link stays down */
2068                                 if (slave->delay <= 0) {
2069                                         /* link down for too long time */
2070                                         slave->link = BOND_LINK_DOWN;
2071
2072                                         /* in active/backup mode, we must
2073                                          * completely disable this interface
2074                                          */
2075                                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2076                                             (bond->params.mode == BOND_MODE_8023AD)) {
2077                                                 bond_set_slave_inactive_flags(slave);
2078                                         }
2079
2080                                         printk(KERN_INFO DRV_NAME
2081                                                ": %s: link status definitely "
2082                                                "down for interface %s, "
2083                                                "disabling it\n",
2084                                                bond_dev->name,
2085                                                slave_dev->name);
2086
2087                                         /* notify ad that the link status has changed */
2088                                         if (bond->params.mode == BOND_MODE_8023AD) {
2089                                                 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2090                                         }
2091
2092                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2093                                             (bond->params.mode == BOND_MODE_ALB)) {
2094                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2095                                         }
2096
2097                                         if (slave == oldcurrent) {
2098                                                 do_failover = 1;
2099                                         }
2100                                 } else {
2101                                         slave->delay--;
2102                                 }
2103                         } else {
2104                                 /* link up again */
2105                                 slave->link  = BOND_LINK_UP;
2106                                 slave->jiffies = jiffies;
2107                                 printk(KERN_INFO DRV_NAME
2108                                        ": %s: link status up again after %d "
2109                                        "ms for interface %s.\n",
2110                                        bond_dev->name,
2111                                        (bond->params.downdelay - slave->delay) * bond->params.miimon,
2112                                        slave_dev->name);
2113                         }
2114                         break;
2115                 case BOND_LINK_DOWN:    /* the link was down */
2116                         if (link_state != BMSR_LSTATUS) {
2117                                 /* the link stays down, nothing more to do */
2118                                 break;
2119                         } else {        /* link going up */
2120                                 slave->link  = BOND_LINK_BACK;
2121                                 slave->delay = bond->params.updelay;
2122
2123                                 if (bond->params.updelay) {
2124                                         /* if updelay == 0, no need to
2125                                            advertise about a 0 ms delay */
2126                                         printk(KERN_INFO DRV_NAME
2127                                                ": %s: link status up for "
2128                                                "interface %s, enabling it "
2129                                                "in %d ms.\n",
2130                                                bond_dev->name,
2131                                                slave_dev->name,
2132                                                bond->params.updelay * bond->params.miimon);
2133                                 }
2134                         }
2135                         /* no break ! fall through the BOND_LINK_BACK state in
2136                            case there's something to do.
2137                         */
2138                 case BOND_LINK_BACK:    /* the link has just come back */
2139                         if (link_state != BMSR_LSTATUS) {
2140                                 /* link down again */
2141                                 slave->link  = BOND_LINK_DOWN;
2142
2143                                 printk(KERN_INFO DRV_NAME
2144                                        ": %s: link status down again after %d "
2145                                        "ms for interface %s.\n",
2146                                        bond_dev->name,
2147                                        (bond->params.updelay - slave->delay) * bond->params.miimon,
2148                                        slave_dev->name);
2149                         } else {
2150                                 /* link stays up */
2151                                 if (slave->delay == 0) {
2152                                         /* now the link has been up for long time enough */
2153                                         slave->link = BOND_LINK_UP;
2154                                         slave->jiffies = jiffies;
2155
2156                                         if (bond->params.mode == BOND_MODE_8023AD) {
2157                                                 /* prevent it from being the active one */
2158                                                 slave->state = BOND_STATE_BACKUP;
2159                                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2160                                                 /* make it immediately active */
2161                                                 slave->state = BOND_STATE_ACTIVE;
2162                                         } else if (slave != bond->primary_slave) {
2163                                                 /* prevent it from being the active one */
2164                                                 slave->state = BOND_STATE_BACKUP;
2165                                         }
2166
2167                                         printk(KERN_INFO DRV_NAME
2168                                                ": %s: link status definitely "
2169                                                "up for interface %s.\n",
2170                                                bond_dev->name,
2171                                                slave_dev->name);
2172
2173                                         /* notify ad that the link status has changed */
2174                                         if (bond->params.mode == BOND_MODE_8023AD) {
2175                                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2176                                         }
2177
2178                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2179                                             (bond->params.mode == BOND_MODE_ALB)) {
2180                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2181                                         }
2182
2183                                         if ((!oldcurrent) ||
2184                                             (slave == bond->primary_slave)) {
2185                                                 do_failover = 1;
2186                                         }
2187                                 } else {
2188                                         slave->delay--;
2189                                 }
2190                         }
2191                         break;
2192                 default:
2193                         /* Should not happen */
2194                         printk(KERN_ERR DRV_NAME
2195                                ": %s: Error: %s Illegal value (link=%d)\n",
2196                                bond_dev->name,
2197                                slave->dev->name,
2198                                slave->link);
2199                         goto out;
2200                 } /* end of switch (slave->link) */
2201
2202                 bond_update_speed_duplex(slave);
2203
2204                 if (bond->params.mode == BOND_MODE_8023AD) {
2205                         if (old_speed != slave->speed) {
2206                                 bond_3ad_adapter_speed_changed(slave);
2207                         }
2208
2209                         if (old_duplex != slave->duplex) {
2210                                 bond_3ad_adapter_duplex_changed(slave);
2211                         }
2212                 }
2213
2214         } /* end of for */
2215
2216         if (do_failover) {
2217                 write_lock(&bond->curr_slave_lock);
2218
2219                 bond_select_active_slave(bond);
2220
2221                 write_unlock(&bond->curr_slave_lock);
2222         } else
2223                 bond_set_carrier(bond);
2224
2225 re_arm:
2226         if (bond->params.miimon) {
2227                 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2228         }
2229 out:
2230         read_unlock(&bond->lock);
2231 }
2232
2233
2234 static u32 bond_glean_dev_ip(struct net_device *dev)
2235 {
2236         struct in_device *idev;
2237         struct in_ifaddr *ifa;
2238         __be32 addr = 0;
2239
2240         if (!dev)
2241                 return 0;
2242
2243         rcu_read_lock();
2244         idev = __in_dev_get_rcu(dev);
2245         if (!idev)
2246                 goto out;
2247
2248         ifa = idev->ifa_list;
2249         if (!ifa)
2250                 goto out;
2251
2252         addr = ifa->ifa_local;
2253 out:
2254         rcu_read_unlock();
2255         return addr;
2256 }
2257
2258 static int bond_has_ip(struct bonding *bond)
2259 {
2260         struct vlan_entry *vlan, *vlan_next;
2261
2262         if (bond->master_ip)
2263                 return 1;
2264
2265         if (list_empty(&bond->vlan_list))
2266                 return 0;
2267
2268         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2269                                  vlan_list) {
2270                 if (vlan->vlan_ip)
2271                         return 1;
2272         }
2273
2274         return 0;
2275 }
2276
2277 static int bond_has_this_ip(struct bonding *bond, u32 ip)
2278 {
2279         struct vlan_entry *vlan, *vlan_next;
2280
2281         if (ip == bond->master_ip)
2282                 return 1;
2283
2284         if (list_empty(&bond->vlan_list))
2285                 return 0;
2286
2287         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2288                                  vlan_list) {
2289                 if (ip == vlan->vlan_ip)
2290                         return 1;
2291         }
2292
2293         return 0;
2294 }
2295
2296 /*
2297  * We go to the (large) trouble of VLAN tagging ARP frames because
2298  * switches in VLAN mode (especially if ports are configured as
2299  * "native" to a VLAN) might not pass non-tagged frames.
2300  */
2301 static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
2302 {
2303         struct sk_buff *skb;
2304
2305         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2306                slave_dev->name, dest_ip, src_ip, vlan_id);
2307
2308         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2309                          NULL, slave_dev->dev_addr, NULL);
2310
2311         if (!skb) {
2312                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2313                 return;
2314         }
2315         if (vlan_id) {
2316                 skb = vlan_put_tag(skb, vlan_id);
2317                 if (!skb) {
2318                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2319                         return;
2320                 }
2321         }
2322         arp_xmit(skb);
2323 }
2324
2325
2326 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2327 {
2328         int i, vlan_id, rv;
2329         u32 *targets = bond->params.arp_targets;
2330         struct vlan_entry *vlan, *vlan_next;
2331         struct net_device *vlan_dev;
2332         struct flowi fl;
2333         struct rtable *rt;
2334
2335         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2336                 if (!targets[i])
2337                         continue;
2338                 dprintk("basa: target %x\n", targets[i]);
2339                 if (list_empty(&bond->vlan_list)) {
2340                         dprintk("basa: empty vlan: arp_send\n");
2341                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2342                                       bond->master_ip, 0);
2343                         continue;
2344                 }
2345
2346                 /*
2347                  * If VLANs are configured, we do a route lookup to
2348                  * determine which VLAN interface would be used, so we
2349                  * can tag the ARP with the proper VLAN tag.
2350                  */
2351                 memset(&fl, 0, sizeof(fl));
2352                 fl.fl4_dst = targets[i];
2353                 fl.fl4_tos = RTO_ONLINK;
2354
2355                 rv = ip_route_output_key(&rt, &fl);
2356                 if (rv) {
2357                         if (net_ratelimit()) {
2358                                 printk(KERN_WARNING DRV_NAME
2359                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2360                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2361                         }
2362                         continue;
2363                 }
2364
2365                 /*
2366                  * This target is not on a VLAN
2367                  */
2368                 if (rt->u.dst.dev == bond->dev) {
2369                         ip_rt_put(rt);
2370                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2371                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2372                                       bond->master_ip, 0);
2373                         continue;
2374                 }
2375
2376                 vlan_id = 0;
2377                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2378                                          vlan_list) {
2379                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2380                         if (vlan_dev == rt->u.dst.dev) {
2381                                 vlan_id = vlan->vlan_id;
2382                                 dprintk("basa: vlan match on %s %d\n",
2383                                        vlan_dev->name, vlan_id);
2384                                 break;
2385                         }
2386                 }
2387
2388                 if (vlan_id) {
2389                         ip_rt_put(rt);
2390                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2391                                       vlan->vlan_ip, vlan_id);
2392                         continue;
2393                 }
2394
2395                 if (net_ratelimit()) {
2396                         printk(KERN_WARNING DRV_NAME
2397                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2398                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2399                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2400                 }
2401                 ip_rt_put(rt);
2402         }
2403 }
2404
2405 /*
2406  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2407  * for each VLAN above us.
2408  */
2409 static void bond_send_gratuitous_arp(struct bonding *bond)
2410 {
2411         struct slave *slave = bond->curr_active_slave;
2412         struct vlan_entry *vlan;
2413         struct net_device *vlan_dev;
2414
2415         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2416                                 slave ? slave->dev->name : "NULL");
2417         if (!slave)
2418                 return;
2419
2420         if (bond->master_ip) {
2421                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2422                                   bond->master_ip, 0);
2423         }
2424
2425         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2426                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2427                 if (vlan->vlan_ip) {
2428                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2429                                       vlan->vlan_ip, vlan->vlan_id);
2430                 }
2431         }
2432 }
2433
2434 static void bond_validate_arp(struct bonding *bond, struct slave *slave, u32 sip, u32 tip)
2435 {
2436         int i;
2437         u32 *targets = bond->params.arp_targets;
2438
2439         targets = bond->params.arp_targets;
2440         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2441                 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2442                         "%u.%u.%u.%u bhti(tip) %d\n",
2443                        NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2444                        bond_has_this_ip(bond, tip));
2445                 if (sip == targets[i]) {
2446                         if (bond_has_this_ip(bond, tip))
2447                                 slave->last_arp_rx = jiffies;
2448                         return;
2449                 }
2450         }
2451 }
2452
2453 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2454 {
2455         struct arphdr *arp;
2456         struct slave *slave;
2457         struct bonding *bond;
2458         unsigned char *arp_ptr;
2459         u32 sip, tip;
2460
2461         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2462                 goto out;
2463
2464         bond = dev->priv;
2465         read_lock(&bond->lock);
2466
2467         dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2468                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2469                 orig_dev ? orig_dev->name : "NULL");
2470
2471         slave = bond_get_slave_by_dev(bond, orig_dev);
2472         if (!slave || !slave_do_arp_validate(bond, slave))
2473                 goto out_unlock;
2474
2475         /* ARP header, plus 2 device addresses, plus 2 IP addresses.  */
2476         if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
2477                                  (2 * dev->addr_len) +
2478                                  (2 * sizeof(u32)))))
2479                 goto out_unlock;
2480
2481         arp = arp_hdr(skb);
2482         if (arp->ar_hln != dev->addr_len ||
2483             skb->pkt_type == PACKET_OTHERHOST ||
2484             skb->pkt_type == PACKET_LOOPBACK ||
2485             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2486             arp->ar_pro != htons(ETH_P_IP) ||
2487             arp->ar_pln != 4)
2488                 goto out_unlock;
2489
2490         arp_ptr = (unsigned char *)(arp + 1);
2491         arp_ptr += dev->addr_len;
2492         memcpy(&sip, arp_ptr, 4);
2493         arp_ptr += 4 + dev->addr_len;
2494         memcpy(&tip, arp_ptr, 4);
2495
2496         dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2497                 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2498                 slave->state, bond->params.arp_validate,
2499                 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2500
2501         /*
2502          * Backup slaves won't see the ARP reply, but do come through
2503          * here for each ARP probe (so we swap the sip/tip to validate
2504          * the probe).  In a "redundant switch, common router" type of
2505          * configuration, the ARP probe will (hopefully) travel from
2506          * the active, through one switch, the router, then the other
2507          * switch before reaching the backup.
2508          */
2509         if (slave->state == BOND_STATE_ACTIVE)
2510                 bond_validate_arp(bond, slave, sip, tip);
2511         else
2512                 bond_validate_arp(bond, slave, tip, sip);
2513
2514 out_unlock:
2515         read_unlock(&bond->lock);
2516 out:
2517         dev_kfree_skb(skb);
2518         return NET_RX_SUCCESS;
2519 }
2520
2521 /*
2522  * this function is called regularly to monitor each slave's link
2523  * ensuring that traffic is being sent and received when arp monitoring
2524  * is used in load-balancing mode. if the adapter has been dormant, then an
2525  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2526  * arp monitoring in active backup mode.
2527  */
2528 void bond_loadbalance_arp_mon(struct net_device *bond_dev)
2529 {
2530         struct bonding *bond = bond_dev->priv;
2531         struct slave *slave, *oldcurrent;
2532         int do_failover = 0;
2533         int delta_in_ticks;
2534         int i;
2535
2536         read_lock(&bond->lock);
2537
2538         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2539
2540         if (bond->kill_timers) {
2541                 goto out;
2542         }
2543
2544         if (bond->slave_cnt == 0) {
2545                 goto re_arm;
2546         }
2547
2548         read_lock(&bond->curr_slave_lock);
2549         oldcurrent = bond->curr_active_slave;
2550         read_unlock(&bond->curr_slave_lock);
2551
2552         /* see if any of the previous devices are up now (i.e. they have
2553          * xmt and rcv traffic). the curr_active_slave does not come into
2554          * the picture unless it is null. also, slave->jiffies is not needed
2555          * here because we send an arp on each slave and give a slave as
2556          * long as it needs to get the tx/rx within the delta.
2557          * TODO: what about up/down delay in arp mode? it wasn't here before
2558          *       so it can wait
2559          */
2560         bond_for_each_slave(bond, slave, i) {
2561                 if (slave->link != BOND_LINK_UP) {
2562                         if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2563                             ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2564
2565                                 slave->link  = BOND_LINK_UP;
2566                                 slave->state = BOND_STATE_ACTIVE;
2567
2568                                 /* primary_slave has no meaning in round-robin
2569                                  * mode. the window of a slave being up and
2570                                  * curr_active_slave being null after enslaving
2571                                  * is closed.
2572                                  */
2573                                 if (!oldcurrent) {
2574                                         printk(KERN_INFO DRV_NAME
2575                                                ": %s: link status definitely "
2576                                                "up for interface %s, ",
2577                                                bond_dev->name,
2578                                                slave->dev->name);
2579                                         do_failover = 1;
2580                                 } else {
2581                                         printk(KERN_INFO DRV_NAME
2582                                                ": %s: interface %s is now up\n",
2583                                                bond_dev->name,
2584                                                slave->dev->name);
2585                                 }
2586                         }
2587                 } else {
2588                         /* slave->link == BOND_LINK_UP */
2589
2590                         /* not all switches will respond to an arp request
2591                          * when the source ip is 0, so don't take the link down
2592                          * if we don't know our ip yet
2593                          */
2594                         if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2595                             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2596                              bond_has_ip(bond))) {
2597
2598                                 slave->link  = BOND_LINK_DOWN;
2599                                 slave->state = BOND_STATE_BACKUP;
2600
2601                                 if (slave->link_failure_count < UINT_MAX) {
2602                                         slave->link_failure_count++;
2603                                 }
2604
2605                                 printk(KERN_INFO DRV_NAME
2606                                        ": %s: interface %s is now down.\n",
2607                                        bond_dev->name,
2608                                        slave->dev->name);
2609
2610                                 if (slave == oldcurrent) {
2611                                         do_failover = 1;
2612                                 }
2613                         }
2614                 }
2615
2616                 /* note: if switch is in round-robin mode, all links
2617                  * must tx arp to ensure all links rx an arp - otherwise
2618                  * links may oscillate or not come up at all; if switch is
2619                  * in something like xor mode, there is nothing we can
2620                  * do - all replies will be rx'ed on same link causing slaves
2621                  * to be unstable during low/no traffic periods
2622                  */
2623                 if (IS_UP(slave->dev)) {
2624                         bond_arp_send_all(bond, slave);
2625                 }
2626         }
2627
2628         if (do_failover) {
2629                 write_lock(&bond->curr_slave_lock);
2630
2631                 bond_select_active_slave(bond);
2632
2633                 write_unlock(&bond->curr_slave_lock);
2634         }
2635
2636 re_arm:
2637         if (bond->params.arp_interval) {
2638                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2639         }
2640 out:
2641         read_unlock(&bond->lock);
2642 }
2643
2644 /*
2645  * When using arp monitoring in active-backup mode, this function is
2646  * called to determine if any backup slaves have went down or a new
2647  * current slave needs to be found.
2648  * The backup slaves never generate traffic, they are considered up by merely
2649  * receiving traffic. If the current slave goes down, each backup slave will
2650  * be given the opportunity to tx/rx an arp before being taken down - this
2651  * prevents all slaves from being taken down due to the current slave not
2652  * sending any traffic for the backups to receive. The arps are not necessarily
2653  * necessary, any tx and rx traffic will keep the current slave up. While any
2654  * rx traffic will keep the backup slaves up, the current slave is responsible
2655  * for generating traffic to keep them up regardless of any other traffic they
2656  * may have received.
2657  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2658  */
2659 void bond_activebackup_arp_mon(struct net_device *bond_dev)
2660 {
2661         struct bonding *bond = bond_dev->priv;
2662         struct slave *slave;
2663         int delta_in_ticks;
2664         int i;
2665
2666         read_lock(&bond->lock);
2667
2668         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2669
2670         if (bond->kill_timers) {
2671                 goto out;
2672         }
2673
2674         if (bond->slave_cnt == 0) {
2675                 goto re_arm;
2676         }
2677
2678         /* determine if any slave has come up or any backup slave has
2679          * gone down
2680          * TODO: what about up/down delay in arp mode? it wasn't here before
2681          *       so it can wait
2682          */
2683         bond_for_each_slave(bond, slave, i) {
2684                 if (slave->link != BOND_LINK_UP) {
2685                         if ((jiffies - slave_last_rx(bond, slave)) <=
2686                              delta_in_ticks) {
2687
2688                                 slave->link = BOND_LINK_UP;
2689
2690                                 write_lock(&bond->curr_slave_lock);
2691
2692                                 if ((!bond->curr_active_slave) &&
2693                                     ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2694                                         bond_change_active_slave(bond, slave);
2695                                         bond->current_arp_slave = NULL;
2696                                 } else if (bond->curr_active_slave != slave) {
2697                                         /* this slave has just come up but we
2698                                          * already have a current slave; this
2699                                          * can also happen if bond_enslave adds
2700                                          * a new slave that is up while we are
2701                                          * searching for a new slave
2702                                          */
2703                                         bond_set_slave_inactive_flags(slave);
2704                                         bond->current_arp_slave = NULL;
2705                                 }
2706
2707                                 bond_set_carrier(bond);
2708
2709                                 if (slave == bond->curr_active_slave) {
2710                                         printk(KERN_INFO DRV_NAME
2711                                                ": %s: %s is up and now the "
2712                                                "active interface\n",
2713                                                bond_dev->name,
2714                                                slave->dev->name);
2715                                         netif_carrier_on(bond->dev);
2716                                 } else {
2717                                         printk(KERN_INFO DRV_NAME
2718                                                ": %s: backup interface %s is "
2719                                                "now up\n",
2720                                                bond_dev->name,
2721                                                slave->dev->name);
2722                                 }
2723
2724                                 write_unlock(&bond->curr_slave_lock);
2725                         }
2726                 } else {
2727                         read_lock(&bond->curr_slave_lock);
2728
2729                         if ((slave != bond->curr_active_slave) &&
2730                             (!bond->current_arp_slave) &&
2731                             (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
2732                              bond_has_ip(bond))) {
2733                                 /* a backup slave has gone down; three times
2734                                  * the delta allows the current slave to be
2735                                  * taken out before the backup slave.
2736                                  * note: a non-null current_arp_slave indicates
2737                                  * the curr_active_slave went down and we are
2738                                  * searching for a new one; under this
2739                                  * condition we only take the curr_active_slave
2740                                  * down - this gives each slave a chance to
2741                                  * tx/rx traffic before being taken out
2742                                  */
2743
2744                                 read_unlock(&bond->curr_slave_lock);
2745
2746                                 slave->link  = BOND_LINK_DOWN;
2747
2748                                 if (slave->link_failure_count < UINT_MAX) {
2749                                         slave->link_failure_count++;
2750                                 }
2751
2752                                 bond_set_slave_inactive_flags(slave);
2753
2754                                 printk(KERN_INFO DRV_NAME
2755                                        ": %s: backup interface %s is now down\n",
2756                                        bond_dev->name,
2757                                        slave->dev->name);
2758                         } else {
2759                                 read_unlock(&bond->curr_slave_lock);
2760                         }
2761                 }
2762         }
2763
2764         read_lock(&bond->curr_slave_lock);
2765         slave = bond->curr_active_slave;
2766         read_unlock(&bond->curr_slave_lock);
2767
2768         if (slave) {
2769                 /* if we have sent traffic in the past 2*arp_intervals but
2770                  * haven't xmit and rx traffic in that time interval, select
2771                  * a different slave. slave->jiffies is only updated when
2772                  * a slave first becomes the curr_active_slave - not necessarily
2773                  * after every arp; this ensures the slave has a full 2*delta
2774                  * before being taken out. if a primary is being used, check
2775                  * if it is up and needs to take over as the curr_active_slave
2776                  */
2777                 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2778             (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
2779              bond_has_ip(bond))) &&
2780                     ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2781
2782                         slave->link  = BOND_LINK_DOWN;
2783
2784                         if (slave->link_failure_count < UINT_MAX) {
2785                                 slave->link_failure_count++;
2786                         }
2787
2788                         printk(KERN_INFO DRV_NAME
2789                                ": %s: link status down for active interface "
2790                                "%s, disabling it\n",
2791                                bond_dev->name,
2792                                slave->dev->name);
2793
2794                         write_lock(&bond->curr_slave_lock);
2795
2796                         bond_select_active_slave(bond);
2797                         slave = bond->curr_active_slave;
2798
2799                         write_unlock(&bond->curr_slave_lock);
2800
2801                         bond->current_arp_slave = slave;
2802
2803                         if (slave) {
2804                                 slave->jiffies = jiffies;
2805                         }
2806                 } else if ((bond->primary_slave) &&
2807                            (bond->primary_slave != slave) &&
2808                            (bond->primary_slave->link == BOND_LINK_UP)) {
2809                         /* at this point, slave is the curr_active_slave */
2810                         printk(KERN_INFO DRV_NAME
2811                                ": %s: changing from interface %s to primary "
2812                                "interface %s\n",
2813                                bond_dev->name,
2814                                slave->dev->name,
2815                                bond->primary_slave->dev->name);
2816
2817                         /* primary is up so switch to it */
2818                         write_lock(&bond->curr_slave_lock);
2819                         bond_change_active_slave(bond, bond->primary_slave);
2820                         write_unlock(&bond->curr_slave_lock);
2821
2822                         slave = bond->primary_slave;
2823                         slave->jiffies = jiffies;
2824                 } else {
2825                         bond->current_arp_slave = NULL;
2826                 }
2827
2828                 /* the current slave must tx an arp to ensure backup slaves
2829                  * rx traffic
2830                  */
2831                 if (slave && bond_has_ip(bond)) {
2832                         bond_arp_send_all(bond, slave);
2833                 }
2834         }
2835
2836         /* if we don't have a curr_active_slave, search for the next available
2837          * backup slave from the current_arp_slave and make it the candidate
2838          * for becoming the curr_active_slave
2839          */
2840         if (!slave) {
2841                 if (!bond->current_arp_slave) {
2842                         bond->current_arp_slave = bond->first_slave;
2843                 }
2844
2845                 if (bond->current_arp_slave) {
2846                         bond_set_slave_inactive_flags(bond->current_arp_slave);
2847
2848                         /* search for next candidate */
2849                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2850                                 if (IS_UP(slave->dev)) {
2851                                         slave->link = BOND_LINK_BACK;
2852                                         bond_set_slave_active_flags(slave);
2853                                         bond_arp_send_all(bond, slave);
2854                                         slave->jiffies = jiffies;
2855                                         bond->current_arp_slave = slave;
2856                                         break;
2857                                 }
2858
2859                                 /* if the link state is up at this point, we
2860                                  * mark it down - this can happen if we have
2861                                  * simultaneous link failures and
2862                                  * reselect_active_interface doesn't make this
2863                                  * one the current slave so it is still marked
2864                                  * up when it is actually down
2865                                  */
2866                                 if (slave->link == BOND_LINK_UP) {
2867                                         slave->link  = BOND_LINK_DOWN;
2868                                         if (slave->link_failure_count < UINT_MAX) {
2869                                                 slave->link_failure_count++;
2870                                         }
2871
2872                                         bond_set_slave_inactive_flags(slave);
2873
2874                                         printk(KERN_INFO DRV_NAME
2875                                                ": %s: backup interface %s is "
2876                                                "now down.\n",
2877                                                bond_dev->name,
2878                                                slave->dev->name);
2879                                 }
2880                         }
2881                 }
2882         }
2883
2884 re_arm:
2885         if (bond->params.arp_interval) {
2886                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2887         }
2888 out:
2889         read_unlock(&bond->lock);
2890 }
2891
2892 /*------------------------------ proc/seq_file-------------------------------*/
2893
2894 #ifdef CONFIG_PROC_FS
2895
2896 #define SEQ_START_TOKEN ((void *)1)
2897
2898 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2899 {
2900         struct bonding *bond = seq->private;
2901         loff_t off = 0;
2902         struct slave *slave;
2903         int i;
2904
2905         /* make sure the bond won't be taken away */
2906         read_lock(&dev_base_lock);
2907         read_lock_bh(&bond->lock);
2908
2909         if (*pos == 0) {
2910                 return SEQ_START_TOKEN;
2911         }
2912
2913         bond_for_each_slave(bond, slave, i) {
2914                 if (++off == *pos) {
2915                         return slave;
2916                 }
2917         }
2918
2919         return NULL;
2920 }
2921
2922 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2923 {
2924         struct bonding *bond = seq->private;
2925         struct slave *slave = v;
2926
2927         ++*pos;
2928         if (v == SEQ_START_TOKEN) {
2929                 return bond->first_slave;
2930         }
2931
2932         slave = slave->next;
2933
2934         return (slave == bond->first_slave) ? NULL : slave;
2935 }
2936
2937 static void bond_info_seq_stop(struct seq_file *seq, void *v)
2938 {
2939         struct bonding *bond = seq->private;
2940
2941         read_unlock_bh(&bond->lock);
2942         read_unlock(&dev_base_lock);
2943 }
2944
2945 static void bond_info_show_master(struct seq_file *seq)
2946 {
2947         struct bonding *bond = seq->private;
2948         struct slave *curr;
2949         int i;
2950         u32 target;
2951
2952         read_lock(&bond->curr_slave_lock);
2953         curr = bond->curr_active_slave;
2954         read_unlock(&bond->curr_slave_lock);
2955
2956         seq_printf(seq, "Bonding Mode: %s\n",
2957                    bond_mode_name(bond->params.mode));
2958
2959         if (bond->params.mode == BOND_MODE_XOR ||
2960                 bond->params.mode == BOND_MODE_8023AD) {
2961                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2962                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2963                         bond->params.xmit_policy);
2964         }
2965
2966         if (USES_PRIMARY(bond->params.mode)) {
2967                 seq_printf(seq, "Primary Slave: %s\n",
2968                            (bond->primary_slave) ?
2969                            bond->primary_slave->dev->name : "None");
2970
2971                 seq_printf(seq, "Currently Active Slave: %s\n",
2972                            (curr) ? curr->dev->name : "None");
2973         }
2974
2975         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
2976                    "up" : "down");
2977         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
2978         seq_printf(seq, "Up Delay (ms): %d\n",
2979                    bond->params.updelay * bond->params.miimon);
2980         seq_printf(seq, "Down Delay (ms): %d\n",
2981                    bond->params.downdelay * bond->params.miimon);
2982
2983
2984         /* ARP information */
2985         if(bond->params.arp_interval > 0) {
2986                 int printed=0;
2987                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
2988                                 bond->params.arp_interval);
2989
2990                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
2991
2992                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
2993                         if (!bond->params.arp_targets[i])
2994                                 continue;
2995                         if (printed)
2996                                 seq_printf(seq, ",");
2997                         target = ntohl(bond->params.arp_targets[i]);
2998                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
2999                         printed = 1;
3000                 }
3001                 seq_printf(seq, "\n");
3002         }
3003
3004         if (bond->params.mode == BOND_MODE_8023AD) {
3005                 struct ad_info ad_info;
3006
3007                 seq_puts(seq, "\n802.3ad info\n");
3008                 seq_printf(seq, "LACP rate: %s\n",
3009                            (bond->params.lacp_fast) ? "fast" : "slow");
3010
3011                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3012                         seq_printf(seq, "bond %s has no active aggregator\n",
3013                                    bond->dev->name);
3014                 } else {
3015                         seq_printf(seq, "Active Aggregator Info:\n");
3016
3017                         seq_printf(seq, "\tAggregator ID: %d\n",
3018                                    ad_info.aggregator_id);
3019                         seq_printf(seq, "\tNumber of ports: %d\n",
3020                                    ad_info.ports);
3021                         seq_printf(seq, "\tActor Key: %d\n",
3022                                    ad_info.actor_key);
3023                         seq_printf(seq, "\tPartner Key: %d\n",
3024                                    ad_info.partner_key);
3025                         seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
3026                                    ad_info.partner_system[0],
3027                                    ad_info.partner_system[1],
3028                                    ad_info.partner_system[2],
3029                                    ad_info.partner_system[3],
3030                                    ad_info.partner_system[4],
3031                                    ad_info.partner_system[5]);
3032                 }
3033         }
3034 }
3035
3036 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3037 {
3038         struct bonding *bond = seq->private;
3039
3040         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3041         seq_printf(seq, "MII Status: %s\n",
3042                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3043         seq_printf(seq, "Link Failure Count: %u\n",
3044                    slave->link_failure_count);
3045
3046         seq_printf(seq,
3047                    "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
3048                    slave->perm_hwaddr[0], slave->perm_hwaddr[1],
3049                    slave->perm_hwaddr[2], slave->perm_hwaddr[3],
3050                    slave->perm_hwaddr[4], slave->perm_hwaddr[5]);
3051
3052         if (bond->params.mode == BOND_MODE_8023AD) {
3053                 const struct aggregator *agg
3054                         = SLAVE_AD_INFO(slave).port.aggregator;
3055
3056                 if (agg) {
3057                         seq_printf(seq, "Aggregator ID: %d\n",
3058                                    agg->aggregator_identifier);
3059                 } else {
3060                         seq_puts(seq, "Aggregator ID: N/A\n");
3061                 }
3062         }
3063 }
3064
3065 static int bond_info_seq_show(struct seq_file *seq, void *v)
3066 {
3067         if (v == SEQ_START_TOKEN) {
3068                 seq_printf(seq, "%s\n", version);
3069                 bond_info_show_master(seq);
3070         } else {
3071                 bond_info_show_slave(seq, v);
3072         }
3073
3074         return 0;
3075 }
3076
3077 static struct seq_operations bond_info_seq_ops = {
3078         .start = bond_info_seq_start,
3079         .next  = bond_info_seq_next,
3080         .stop  = bond_info_seq_stop,
3081         .show  = bond_info_seq_show,
3082 };
3083
3084 static int bond_info_open(struct inode *inode, struct file *file)
3085 {
3086         struct seq_file *seq;
3087         struct proc_dir_entry *proc;
3088         int res;
3089
3090         res = seq_open(file, &bond_info_seq_ops);
3091         if (!res) {
3092                 /* recover the pointer buried in proc_dir_entry data */
3093                 seq = file->private_data;
3094                 proc = PDE(inode);
3095                 seq->private = proc->data;
3096         }
3097
3098         return res;
3099 }
3100
3101 static const struct file_operations bond_info_fops = {
3102         .owner   = THIS_MODULE,
3103         .open    = bond_info_open,
3104         .read    = seq_read,
3105         .llseek  = seq_lseek,
3106         .release = seq_release,
3107 };
3108
3109 static int bond_create_proc_entry(struct bonding *bond)
3110 {
3111         struct net_device *bond_dev = bond->dev;
3112
3113         if (bond_proc_dir) {
3114                 bond->proc_entry = create_proc_entry(bond_dev->name,
3115                                                      S_IRUGO,
3116                                                      bond_proc_dir);
3117                 if (bond->proc_entry == NULL) {
3118                         printk(KERN_WARNING DRV_NAME
3119                                ": Warning: Cannot create /proc/net/%s/%s\n",
3120                                DRV_NAME, bond_dev->name);
3121                 } else {
3122                         bond->proc_entry->data = bond;
3123                         bond->proc_entry->proc_fops = &bond_info_fops;
3124                         bond->proc_entry->owner = THIS_MODULE;
3125                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3126                 }
3127         }
3128
3129         return 0;
3130 }
3131
3132 static void bond_remove_proc_entry(struct bonding *bond)
3133 {
3134         if (bond_proc_dir && bond->proc_entry) {
3135                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3136                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3137                 bond->proc_entry = NULL;
3138         }
3139 }
3140
3141 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3142  * Caller must hold rtnl_lock.
3143  */
3144 static void bond_create_proc_dir(void)
3145 {
3146         int len = strlen(DRV_NAME);
3147
3148         for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
3149              bond_proc_dir = bond_proc_dir->next) {
3150                 if ((bond_proc_dir->namelen == len) &&
3151                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3152                         break;
3153                 }
3154         }
3155
3156         if (!bond_proc_dir) {
3157                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3158                 if (bond_proc_dir) {
3159                         bond_proc_dir->owner = THIS_MODULE;
3160                 } else {
3161                         printk(KERN_WARNING DRV_NAME
3162                                 ": Warning: cannot create /proc/net/%s\n",
3163                                 DRV_NAME);
3164                 }
3165         }
3166 }
3167
3168 /* Destroy the bonding directory under /proc/net, if empty.
3169  * Caller must hold rtnl_lock.
3170  */
3171 static void bond_destroy_proc_dir(void)
3172 {
3173         struct proc_dir_entry *de;
3174
3175         if (!bond_proc_dir) {
3176                 return;
3177         }
3178
3179         /* verify that the /proc dir is empty */
3180         for (de = bond_proc_dir->subdir; de; de = de->next) {
3181                 /* ignore . and .. */
3182                 if (*(de->name) != '.') {
3183                         break;
3184                 }
3185         }
3186
3187         if (de) {
3188                 if (bond_proc_dir->owner == THIS_MODULE) {
3189                         bond_proc_dir->owner = NULL;
3190                 }
3191         } else {
3192                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3193                 bond_proc_dir = NULL;
3194         }
3195 }
3196 #endif /* CONFIG_PROC_FS */
3197
3198 /*-------------------------- netdev event handling --------------------------*/
3199
3200 /*
3201  * Change device name
3202  */
3203 static int bond_event_changename(struct bonding *bond)
3204 {
3205 #ifdef CONFIG_PROC_FS
3206         bond_remove_proc_entry(bond);
3207         bond_create_proc_entry(bond);
3208 #endif
3209         down_write(&(bonding_rwsem));
3210         bond_destroy_sysfs_entry(bond);
3211         bond_create_sysfs_entry(bond);
3212         up_write(&(bonding_rwsem));
3213         return NOTIFY_DONE;
3214 }
3215
3216 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3217 {
3218         struct bonding *event_bond = bond_dev->priv;
3219
3220         switch (event) {
3221         case NETDEV_CHANGENAME:
3222                 return bond_event_changename(event_bond);
3223         case NETDEV_UNREGISTER:
3224                 /*
3225                  * TODO: remove a bond from the list?
3226                  */
3227                 break;
3228         default:
3229                 break;
3230         }
3231
3232         return NOTIFY_DONE;
3233 }
3234
3235 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3236 {
3237         struct net_device *bond_dev = slave_dev->master;
3238         struct bonding *bond = bond_dev->priv;
3239
3240         switch (event) {
3241         case NETDEV_UNREGISTER:
3242                 if (bond_dev) {
3243                         bond_release(bond_dev, slave_dev);
3244                 }
3245                 break;
3246         case NETDEV_CHANGE:
3247                 /*
3248                  * TODO: is this what we get if somebody
3249                  * sets up a hierarchical bond, then rmmod's
3250                  * one of the slave bonding devices?
3251                  */
3252                 break;
3253         case NETDEV_DOWN:
3254                 /*
3255                  * ... Or is it this?
3256                  */
3257                 break;
3258         case NETDEV_CHANGEMTU:
3259                 /*
3260                  * TODO: Should slaves be allowed to
3261                  * independently alter their MTU?  For
3262                  * an active-backup bond, slaves need
3263                  * not be the same type of device, so
3264                  * MTUs may vary.  For other modes,
3265                  * slaves arguably should have the
3266                  * same MTUs. To do this, we'd need to
3267                  * take over the slave's change_mtu
3268                  * function for the duration of their
3269                  * servitude.
3270                  */
3271                 break;
3272         case NETDEV_CHANGENAME:
3273                 /*
3274                  * TODO: handle changing the primary's name
3275                  */
3276                 break;
3277         case NETDEV_FEAT_CHANGE:
3278                 bond_compute_features(bond);
3279                 break;
3280         default:
3281                 break;
3282         }
3283
3284         return NOTIFY_DONE;
3285 }
3286
3287 /*
3288  * bond_netdev_event: handle netdev notifier chain events.
3289  *
3290  * This function receives events for the netdev chain.  The caller (an
3291  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3292  * locks for us to safely manipulate the slave devices (RTNL lock,
3293  * dev_probe_lock).
3294  */
3295 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3296 {
3297         struct net_device *event_dev = (struct net_device *)ptr;
3298
3299         dprintk("event_dev: %s, event: %lx\n",
3300                 (event_dev ? event_dev->name : "None"),
3301                 event);
3302
3303         if (!(event_dev->priv_flags & IFF_BONDING))
3304                 return NOTIFY_DONE;
3305
3306         if (event_dev->flags & IFF_MASTER) {
3307                 dprintk("IFF_MASTER\n");
3308                 return bond_master_netdev_event(event, event_dev);
3309         }
3310
3311         if (event_dev->flags & IFF_SLAVE) {
3312                 dprintk("IFF_SLAVE\n");
3313                 return bond_slave_netdev_event(event, event_dev);
3314         }
3315
3316         return NOTIFY_DONE;
3317 }
3318
3319 /*
3320  * bond_inetaddr_event: handle inetaddr notifier chain events.
3321  *
3322  * We keep track of device IPs primarily to use as source addresses in
3323  * ARP monitor probes (rather than spewing out broadcasts all the time).
3324  *
3325  * We track one IP for the main device (if it has one), plus one per VLAN.
3326  */
3327 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3328 {
3329         struct in_ifaddr *ifa = ptr;
3330         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3331         struct bonding *bond, *bond_next;
3332         struct vlan_entry *vlan, *vlan_next;
3333
3334         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3335                 if (bond->dev == event_dev) {
3336                         switch (event) {
3337                         case NETDEV_UP:
3338                                 bond->master_ip = ifa->ifa_local;
3339                                 return NOTIFY_OK;
3340                         case NETDEV_DOWN:
3341                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3342                                 return NOTIFY_OK;
3343                         default:
3344                                 return NOTIFY_DONE;
3345                         }
3346                 }
3347
3348                 if (list_empty(&bond->vlan_list))
3349                         continue;
3350
3351                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3352                                          vlan_list) {
3353                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3354                         if (vlan_dev == event_dev) {
3355                                 switch (event) {
3356                                 case NETDEV_UP:
3357                                         vlan->vlan_ip = ifa->ifa_local;
3358                                         return NOTIFY_OK;
3359                                 case NETDEV_DOWN:
3360                                         vlan->vlan_ip =
3361                                                 bond_glean_dev_ip(vlan_dev);
3362                                         return NOTIFY_OK;
3363                                 default:
3364                                         return NOTIFY_DONE;
3365                                 }
3366                         }
3367                 }
3368         }
3369         return NOTIFY_DONE;
3370 }
3371
3372 static struct notifier_block bond_netdev_notifier = {
3373         .notifier_call = bond_netdev_event,
3374 };
3375
3376 static struct notifier_block bond_inetaddr_notifier = {
3377         .notifier_call = bond_inetaddr_event,
3378 };
3379
3380 /*-------------------------- Packet type handling ---------------------------*/
3381
3382 /* register to receive lacpdus on a bond */
3383 static void bond_register_lacpdu(struct bonding *bond)
3384 {
3385         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3386
3387         /* initialize packet type */
3388         pk_type->type = PKT_TYPE_LACPDU;
3389         pk_type->dev = bond->dev;
3390         pk_type->func = bond_3ad_lacpdu_recv;
3391
3392         dev_add_pack(pk_type);
3393 }
3394
3395 /* unregister to receive lacpdus on a bond */
3396 static void bond_unregister_lacpdu(struct bonding *bond)
3397 {
3398         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3399 }
3400
3401 void bond_register_arp(struct bonding *bond)
3402 {
3403         struct packet_type *pt = &bond->arp_mon_pt;
3404
3405         if (pt->type)
3406                 return;
3407
3408         pt->type = htons(ETH_P_ARP);
3409         pt->dev = bond->dev;
3410         pt->func = bond_arp_rcv;
3411         dev_add_pack(pt);
3412 }
3413
3414 void bond_unregister_arp(struct bonding *bond)
3415 {
3416         struct packet_type *pt = &bond->arp_mon_pt;
3417
3418         dev_remove_pack(pt);
3419         pt->type = 0;
3420 }
3421
3422 /*---------------------------- Hashing Policies -----------------------------*/
3423
3424 /*
3425  * Hash for the output device based upon layer 3 and layer 4 data. If
3426  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3427  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3428  */
3429 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3430                                     struct net_device *bond_dev, int count)
3431 {
3432         struct ethhdr *data = (struct ethhdr *)skb->data;
3433         struct iphdr *iph = ip_hdr(skb);
3434         u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
3435         int layer4_xor = 0;
3436
3437         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3438                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3439                     (iph->protocol == IPPROTO_TCP ||
3440                      iph->protocol == IPPROTO_UDP)) {
3441                         layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
3442                 }
3443                 return (layer4_xor ^
3444                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3445
3446         }
3447
3448         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3449 }
3450
3451 /*
3452  * Hash for the output device based upon layer 2 data
3453  */
3454 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3455                                    struct net_device *bond_dev, int count)
3456 {
3457         struct ethhdr *data = (struct ethhdr *)skb->data;
3458
3459         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3460 }
3461
3462 /*-------------------------- Device entry points ----------------------------*/
3463
3464 static int bond_open(struct net_device *bond_dev)
3465 {
3466         struct bonding *bond = bond_dev->priv;
3467         struct timer_list *mii_timer = &bond->mii_timer;
3468         struct timer_list *arp_timer = &bond->arp_timer;
3469
3470         bond->kill_timers = 0;
3471
3472         if ((bond->params.mode == BOND_MODE_TLB) ||
3473             (bond->params.mode == BOND_MODE_ALB)) {
3474                 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3475
3476                 /* bond_alb_initialize must be called before the timer
3477                  * is started.
3478                  */
3479                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3480                         /* something went wrong - fail the open operation */
3481                         return -1;
3482                 }
3483
3484                 init_timer(alb_timer);
3485                 alb_timer->expires  = jiffies + 1;
3486                 alb_timer->data     = (unsigned long)bond;
3487                 alb_timer->function = (void *)&bond_alb_monitor;
3488                 add_timer(alb_timer);
3489         }
3490
3491         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3492                 init_timer(mii_timer);
3493                 mii_timer->expires  = jiffies + 1;
3494                 mii_timer->data     = (unsigned long)bond_dev;
3495                 mii_timer->function = (void *)&bond_mii_monitor;
3496                 add_timer(mii_timer);
3497         }
3498
3499         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3500                 init_timer(arp_timer);
3501                 arp_timer->expires  = jiffies + 1;
3502                 arp_timer->data     = (unsigned long)bond_dev;
3503                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3504                         arp_timer->function = (void *)&bond_activebackup_arp_mon;
3505                 } else {
3506                         arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3507                 }
3508                 if (bond->params.arp_validate)
3509                         bond_register_arp(bond);
3510
3511                 add_timer(arp_timer);
3512         }
3513
3514         if (bond->params.mode == BOND_MODE_8023AD) {
3515                 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3516                 init_timer(ad_timer);
3517                 ad_timer->expires  = jiffies + 1;
3518                 ad_timer->data     = (unsigned long)bond;
3519                 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3520                 add_timer(ad_timer);
3521
3522                 /* register to receive LACPDUs */
3523                 bond_register_lacpdu(bond);
3524         }
3525
3526         return 0;
3527 }
3528
3529 static int bond_close(struct net_device *bond_dev)
3530 {
3531         struct bonding *bond = bond_dev->priv;
3532
3533         if (bond->params.mode == BOND_MODE_8023AD) {
3534                 /* Unregister the receive of LACPDUs */
3535                 bond_unregister_lacpdu(bond);
3536         }
3537
3538         if (bond->params.arp_validate)
3539                 bond_unregister_arp(bond);
3540
3541         write_lock_bh(&bond->lock);
3542
3543
3544         /* signal timers not to re-arm */
3545         bond->kill_timers = 1;
3546
3547         write_unlock_bh(&bond->lock);
3548
3549         /* del_timer_sync must run without holding the bond->lock
3550          * because a running timer might be trying to hold it too
3551          */
3552
3553         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3554                 del_timer_sync(&bond->mii_timer);
3555         }
3556
3557         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3558                 del_timer_sync(&bond->arp_timer);
3559         }
3560
3561         switch (bond->params.mode) {
3562         case BOND_MODE_8023AD:
3563                 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3564                 break;
3565         case BOND_MODE_TLB:
3566         case BOND_MODE_ALB:
3567                 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3568                 break;
3569         default:
3570                 break;
3571         }
3572
3573
3574         if ((bond->params.mode == BOND_MODE_TLB) ||
3575             (bond->params.mode == BOND_MODE_ALB)) {
3576                 /* Must be called only after all
3577                  * slaves have been released
3578                  */
3579                 bond_alb_deinitialize(bond);
3580         }
3581
3582         return 0;
3583 }
3584
3585 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3586 {
3587         struct bonding *bond = bond_dev->priv;
3588         struct net_device_stats *stats = &(bond->stats), *sstats;
3589         struct slave *slave;
3590         int i;
3591
3592         memset(stats, 0, sizeof(struct net_device_stats));
3593
3594         read_lock_bh(&bond->lock);
3595
3596         bond_for_each_slave(bond, slave, i) {
3597                 sstats = slave->dev->get_stats(slave->dev);
3598                 stats->rx_packets += sstats->rx_packets;
3599                 stats->rx_bytes += sstats->rx_bytes;
3600                 stats->rx_errors += sstats->rx_errors;
3601                 stats->rx_dropped += sstats->rx_dropped;
3602
3603                 stats->tx_packets += sstats->tx_packets;
3604                 stats->tx_bytes += sstats->tx_bytes;
3605                 stats->tx_errors += sstats->tx_errors;
3606                 stats->tx_dropped += sstats->tx_dropped;
3607
3608                 stats->multicast += sstats->multicast;
3609                 stats->collisions += sstats->collisions;
3610
3611                 stats->rx_length_errors += sstats->rx_length_errors;
3612                 stats->rx_over_errors += sstats->rx_over_errors;
3613                 stats->rx_crc_errors += sstats->rx_crc_errors;
3614                 stats->rx_frame_errors += sstats->rx_frame_errors;
3615                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3616                 stats->rx_missed_errors += sstats->rx_missed_errors;
3617
3618                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3619                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3620                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3621                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3622                 stats->tx_window_errors += sstats->tx_window_errors;
3623         }
3624
3625         read_unlock_bh(&bond->lock);
3626
3627         return stats;
3628 }
3629
3630 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3631 {
3632         struct net_device *slave_dev = NULL;
3633         struct ifbond k_binfo;
3634         struct ifbond __user *u_binfo = NULL;
3635         struct ifslave k_sinfo;
3636         struct ifslave __user *u_sinfo = NULL;
3637         struct mii_ioctl_data *mii = NULL;
3638         int res = 0;
3639
3640         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3641                 bond_dev->name, cmd);
3642
3643         switch (cmd) {
3644         case SIOCGMIIPHY:
3645                 mii = if_mii(ifr);
3646                 if (!mii) {
3647                         return -EINVAL;
3648                 }
3649                 mii->phy_id = 0;
3650                 /* Fall Through */
3651         case SIOCGMIIREG:
3652                 /*
3653                  * We do this again just in case we were called by SIOCGMIIREG
3654                  * instead of SIOCGMIIPHY.
3655                  */
3656                 mii = if_mii(ifr);
3657                 if (!mii) {
3658                         return -EINVAL;
3659                 }
3660
3661                 if (mii->reg_num == 1) {
3662                         struct bonding *bond = bond_dev->priv;
3663                         mii->val_out = 0;
3664                         read_lock_bh(&bond->lock);
3665                         read_lock(&bond->curr_slave_lock);
3666                         if (netif_carrier_ok(bond->dev)) {
3667                                 mii->val_out = BMSR_LSTATUS;
3668                         }
3669                         read_unlock(&bond->curr_slave_lock);
3670                         read_unlock_bh(&bond->lock);
3671                 }
3672
3673                 return 0;
3674         case BOND_INFO_QUERY_OLD:
3675         case SIOCBONDINFOQUERY:
3676                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3677
3678                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3679                         return -EFAULT;
3680                 }
3681
3682                 res = bond_info_query(bond_dev, &k_binfo);
3683                 if (res == 0) {
3684                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3685                                 return -EFAULT;
3686                         }
3687                 }
3688
3689                 return res;
3690         case BOND_SLAVE_INFO_QUERY_OLD:
3691         case SIOCBONDSLAVEINFOQUERY:
3692                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3693
3694                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3695                         return -EFAULT;
3696                 }
3697
3698                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3699                 if (res == 0) {
3700                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3701                                 return -EFAULT;
3702                         }
3703                 }
3704
3705                 return res;
3706         default:
3707                 /* Go on */
3708                 break;
3709         }
3710
3711         if (!capable(CAP_NET_ADMIN)) {
3712                 return -EPERM;
3713         }
3714
3715         down_write(&(bonding_rwsem));
3716         slave_dev = dev_get_by_name(ifr->ifr_slave);
3717
3718         dprintk("slave_dev=%p: \n", slave_dev);
3719
3720         if (!slave_dev) {
3721                 res = -ENODEV;
3722         } else {
3723                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3724                 switch (cmd) {
3725                 case BOND_ENSLAVE_OLD:
3726                 case SIOCBONDENSLAVE:
3727                         res = bond_enslave(bond_dev, slave_dev);
3728                         break;
3729                 case BOND_RELEASE_OLD:
3730                 case SIOCBONDRELEASE:
3731                         res = bond_release(bond_dev, slave_dev);
3732                         break;
3733                 case BOND_SETHWADDR_OLD:
3734                 case SIOCBONDSETHWADDR:
3735                         res = bond_sethwaddr(bond_dev, slave_dev);
3736                         break;
3737                 case BOND_CHANGE_ACTIVE_OLD:
3738                 case SIOCBONDCHANGEACTIVE:
3739                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3740                         break;
3741                 default:
3742                         res = -EOPNOTSUPP;
3743                 }
3744
3745                 dev_put(slave_dev);
3746         }
3747
3748         up_write(&(bonding_rwsem));
3749         return res;
3750 }
3751
3752 static void bond_set_multicast_list(struct net_device *bond_dev)
3753 {
3754         struct bonding *bond = bond_dev->priv;
3755         struct dev_mc_list *dmi;
3756
3757         write_lock_bh(&bond->lock);
3758
3759         /*
3760          * Do promisc before checking multicast_mode
3761          */
3762         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3763                 bond_set_promiscuity(bond, 1);
3764         }
3765
3766         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3767                 bond_set_promiscuity(bond, -1);
3768         }
3769
3770         /* set allmulti flag to slaves */
3771         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3772                 bond_set_allmulti(bond, 1);
3773         }
3774
3775         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3776                 bond_set_allmulti(bond, -1);
3777         }
3778
3779         bond->flags = bond_dev->flags;
3780
3781         /* looking for addresses to add to slaves' mc list */
3782         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3783                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3784                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3785                 }
3786         }
3787
3788         /* looking for addresses to delete from slaves' list */
3789         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3790                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3791                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3792                 }
3793         }
3794
3795         /* save master's multicast list */
3796         bond_mc_list_destroy(bond);
3797         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3798
3799         write_unlock_bh(&bond->lock);
3800 }
3801
3802 /*
3803  * Change the MTU of all of a master's slaves to match the master
3804  */
3805 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3806 {
3807         struct bonding *bond = bond_dev->priv;
3808         struct slave *slave, *stop_at;
3809         int res = 0;
3810         int i;
3811
3812         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3813                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3814
3815         /* Can't hold bond->lock with bh disabled here since
3816          * some base drivers panic. On the other hand we can't
3817          * hold bond->lock without bh disabled because we'll
3818          * deadlock. The only solution is to rely on the fact
3819          * that we're under rtnl_lock here, and the slaves
3820          * list won't change. This doesn't solve the problem
3821          * of setting the slave's MTU while it is
3822          * transmitting, but the assumption is that the base
3823          * driver can handle that.
3824          *
3825          * TODO: figure out a way to safely iterate the slaves
3826          * list, but without holding a lock around the actual
3827          * call to the base driver.
3828          */
3829
3830         bond_for_each_slave(bond, slave, i) {
3831                 dprintk("s %p s->p %p c_m %p\n", slave,
3832                         slave->prev, slave->dev->change_mtu);
3833
3834                 res = dev_set_mtu(slave->dev, new_mtu);
3835
3836                 if (res) {
3837                         /* If we failed to set the slave's mtu to the new value
3838                          * we must abort the operation even in ACTIVE_BACKUP
3839                          * mode, because if we allow the backup slaves to have
3840                          * different mtu values than the active slave we'll
3841                          * need to change their mtu when doing a failover. That
3842                          * means changing their mtu from timer context, which
3843                          * is probably not a good idea.
3844                          */
3845                         dprintk("err %d %s\n", res, slave->dev->name);
3846                         goto unwind;
3847                 }
3848         }
3849
3850         bond_dev->mtu = new_mtu;
3851
3852         return 0;
3853
3854 unwind:
3855         /* unwind from head to the slave that failed */
3856         stop_at = slave;
3857         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3858                 int tmp_res;
3859
3860                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3861                 if (tmp_res) {
3862                         dprintk("unwind err %d dev %s\n", tmp_res,
3863                                 slave->dev->name);
3864                 }
3865         }
3866
3867         return res;
3868 }
3869
3870 /*
3871  * Change HW address
3872  *
3873  * Note that many devices must be down to change the HW address, and
3874  * downing the master releases all slaves.  We can make bonds full of
3875  * bonding devices to test this, however.
3876  */
3877 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3878 {
3879         struct bonding *bond = bond_dev->priv;
3880         struct sockaddr *sa = addr, tmp_sa;
3881         struct slave *slave, *stop_at;
3882         int res = 0;
3883         int i;
3884
3885         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3886
3887         if (!is_valid_ether_addr(sa->sa_data)) {
3888                 return -EADDRNOTAVAIL;
3889         }
3890
3891         /* Can't hold bond->lock with bh disabled here since
3892          * some base drivers panic. On the other hand we can't
3893          * hold bond->lock without bh disabled because we'll
3894          * deadlock. The only solution is to rely on the fact
3895          * that we're under rtnl_lock here, and the slaves
3896          * list won't change. This doesn't solve the problem
3897          * of setting the slave's hw address while it is
3898          * transmitting, but the assumption is that the base
3899          * driver can handle that.
3900          *
3901          * TODO: figure out a way to safely iterate the slaves
3902          * list, but without holding a lock around the actual
3903          * call to the base driver.
3904          */
3905
3906         bond_for_each_slave(bond, slave, i) {
3907                 dprintk("slave %p %s\n", slave, slave->dev->name);
3908
3909                 if (slave->dev->set_mac_address == NULL) {
3910                         res = -EOPNOTSUPP;
3911                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3912                         goto unwind;
3913                 }
3914
3915                 res = dev_set_mac_address(slave->dev, addr);
3916                 if (res) {
3917                         /* TODO: consider downing the slave
3918                          * and retry ?
3919                          * User should expect communications
3920                          * breakage anyway until ARP finish
3921                          * updating, so...
3922                          */
3923                         dprintk("err %d %s\n", res, slave->dev->name);
3924                         goto unwind;
3925                 }
3926         }
3927
3928         /* success */
3929         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3930         return 0;
3931
3932 unwind:
3933         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3934         tmp_sa.sa_family = bond_dev->type;
3935
3936         /* unwind from head to the slave that failed */
3937         stop_at = slave;
3938         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3939                 int tmp_res;
3940
3941                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3942                 if (tmp_res) {
3943                         dprintk("unwind err %d dev %s\n", tmp_res,
3944                                 slave->dev->name);
3945                 }
3946         }
3947
3948         return res;
3949 }
3950
3951 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3952 {
3953         struct bonding *bond = bond_dev->priv;
3954         struct slave *slave, *start_at;
3955         int i;
3956         int res = 1;
3957
3958         read_lock(&bond->lock);
3959
3960         if (!BOND_IS_OK(bond)) {
3961                 goto out;
3962         }
3963
3964         read_lock(&bond->curr_slave_lock);
3965         slave = start_at = bond->curr_active_slave;
3966         read_unlock(&bond->curr_slave_lock);
3967
3968         if (!slave) {
3969                 goto out;
3970         }
3971
3972         bond_for_each_slave_from(bond, slave, i, start_at) {
3973                 if (IS_UP(slave->dev) &&
3974                     (slave->link == BOND_LINK_UP) &&
3975                     (slave->state == BOND_STATE_ACTIVE)) {
3976                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3977
3978                         write_lock(&bond->curr_slave_lock);
3979                         bond->curr_active_slave = slave->next;
3980                         write_unlock(&bond->curr_slave_lock);
3981
3982                         break;
3983                 }
3984         }
3985
3986
3987 out:
3988         if (res) {
3989                 /* no suitable interface, frame not sent */
3990                 dev_kfree_skb(skb);
3991         }
3992         read_unlock(&bond->lock);
3993         return 0;
3994 }
3995
3996
3997 /*
3998  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3999  * the bond has a usable interface.
4000  */
4001 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4002 {
4003         struct bonding *bond = bond_dev->priv;
4004         int res = 1;
4005
4006         read_lock(&bond->lock);
4007         read_lock(&bond->curr_slave_lock);
4008
4009         if (!BOND_IS_OK(bond)) {
4010                 goto out;
4011         }
4012
4013         if (!bond->curr_active_slave)
4014                 goto out;
4015
4016         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4017
4018 out:
4019         if (res) {
4020                 /* no suitable interface, frame not sent */
4021                 dev_kfree_skb(skb);
4022         }
4023         read_unlock(&bond->curr_slave_lock);
4024         read_unlock(&bond->lock);
4025         return 0;
4026 }
4027
4028 /*
4029  * In bond_xmit_xor() , we determine the output device by using a pre-
4030  * determined xmit_hash_policy(), If the selected device is not enabled,
4031  * find the next active slave.
4032  */
4033 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4034 {
4035         struct bonding *bond = bond_dev->priv;
4036         struct slave *slave, *start_at;
4037         int slave_no;
4038         int i;
4039         int res = 1;
4040
4041         read_lock(&bond->lock);
4042
4043         if (!BOND_IS_OK(bond)) {
4044                 goto out;
4045         }
4046
4047         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4048
4049         bond_for_each_slave(bond, slave, i) {
4050                 slave_no--;
4051                 if (slave_no < 0) {
4052                         break;
4053                 }
4054         }
4055
4056         start_at = slave;
4057
4058         bond_for_each_slave_from(bond, slave, i, start_at) {
4059                 if (IS_UP(slave->dev) &&
4060                     (slave->link == BOND_LINK_UP) &&
4061                     (slave->state == BOND_STATE_ACTIVE)) {
4062                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4063                         break;
4064                 }
4065         }
4066
4067 out:
4068         if (res) {
4069                 /* no suitable interface, frame not sent */
4070                 dev_kfree_skb(skb);
4071         }
4072         read_unlock(&bond->lock);
4073         return 0;
4074 }
4075
4076 /*
4077  * in broadcast mode, we send everything to all usable interfaces.
4078  */
4079 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4080 {
4081         struct bonding *bond = bond_dev->priv;
4082         struct slave *slave, *start_at;
4083         struct net_device *tx_dev = NULL;
4084         int i;
4085         int res = 1;
4086
4087         read_lock(&bond->lock);
4088
4089         if (!BOND_IS_OK(bond)) {
4090                 goto out;
4091         }
4092
4093         read_lock(&bond->curr_slave_lock);
4094         start_at = bond->curr_active_slave;
4095         read_unlock(&bond->curr_slave_lock);
4096
4097         if (!start_at) {
4098                 goto out;
4099         }
4100
4101         bond_for_each_slave_from(bond, slave, i, start_at) {
4102                 if (IS_UP(slave->dev) &&
4103                     (slave->link == BOND_LINK_UP) &&
4104                     (slave->state == BOND_STATE_ACTIVE)) {
4105                         if (tx_dev) {
4106                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4107                                 if (!skb2) {
4108                                         printk(KERN_ERR DRV_NAME
4109                                                ": %s: Error: bond_xmit_broadcast(): "
4110                                                "skb_clone() failed\n",
4111                                                bond_dev->name);
4112                                         continue;
4113                                 }
4114
4115                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4116                                 if (res) {
4117                                         dev_kfree_skb(skb2);
4118                                         continue;
4119                                 }
4120                         }
4121                         tx_dev = slave->dev;
4122                 }
4123         }
4124
4125         if (tx_dev) {
4126                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4127         }
4128
4129 out:
4130         if (res) {
4131                 /* no suitable interface, frame not sent */
4132                 dev_kfree_skb(skb);
4133         }
4134         /* frame sent to all suitable interfaces */
4135         read_unlock(&bond->lock);
4136         return 0;
4137 }
4138
4139 /*------------------------- Device initialization ---------------------------*/
4140
4141 /*
4142  * set bond mode specific net device operations
4143  */
4144 void bond_set_mode_ops(struct bonding *bond, int mode)
4145 {
4146         struct net_device *bond_dev = bond->dev;
4147
4148         switch (mode) {
4149         case BOND_MODE_ROUNDROBIN:
4150                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4151                 break;
4152         case BOND_MODE_ACTIVEBACKUP:
4153                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4154                 break;
4155         case BOND_MODE_XOR:
4156                 bond_dev->hard_start_xmit = bond_xmit_xor;
4157                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4158                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4159                 else
4160                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4161                 break;
4162         case BOND_MODE_BROADCAST:
4163                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4164                 break;
4165         case BOND_MODE_8023AD:
4166                 bond_set_master_3ad_flags(bond);
4167                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4168                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4169                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4170                 else
4171                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4172                 break;
4173         case BOND_MODE_ALB:
4174                 bond_set_master_alb_flags(bond);
4175                 /* FALLTHRU */
4176         case BOND_MODE_TLB:
4177                 bond_dev->hard_start_xmit = bond_alb_xmit;
4178                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4179                 break;
4180         default:
4181                 /* Should never happen, mode already checked */
4182                 printk(KERN_ERR DRV_NAME
4183                        ": %s: Error: Unknown bonding mode %d\n",
4184                        bond_dev->name,
4185                        mode);
4186                 break;
4187         }
4188 }
4189
4190 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4191                                     struct ethtool_drvinfo *drvinfo)
4192 {
4193         strncpy(drvinfo->driver, DRV_NAME, 32);
4194         strncpy(drvinfo->version, DRV_VERSION, 32);
4195         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4196 }
4197
4198 static const struct ethtool_ops bond_ethtool_ops = {
4199         .get_tx_csum            = ethtool_op_get_tx_csum,
4200         .get_tso                = ethtool_op_get_tso,
4201         .get_ufo                = ethtool_op_get_ufo,
4202         .get_sg                 = ethtool_op_get_sg,
4203         .get_drvinfo            = bond_ethtool_get_drvinfo,
4204 };
4205
4206 /*
4207  * Does not allocate but creates a /proc entry.
4208  * Allowed to fail.
4209  */
4210 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4211 {
4212         struct bonding *bond = bond_dev->priv;
4213
4214         dprintk("Begin bond_init for %s\n", bond_dev->name);
4215
4216         /* initialize rwlocks */
4217         rwlock_init(&bond->lock);
4218         rwlock_init(&bond->curr_slave_lock);
4219
4220         bond->params = *params; /* copy params struct */
4221
4222         /* Initialize pointers */
4223         bond->first_slave = NULL;
4224         bond->curr_active_slave = NULL;
4225         bond->current_arp_slave = NULL;
4226         bond->primary_slave = NULL;
4227         bond->dev = bond_dev;
4228         INIT_LIST_HEAD(&bond->vlan_list);
4229
4230         /* Initialize the device entry points */
4231         bond_dev->open = bond_open;
4232         bond_dev->stop = bond_close;
4233         bond_dev->get_stats = bond_get_stats;
4234         bond_dev->do_ioctl = bond_do_ioctl;
4235         bond_dev->ethtool_ops = &bond_ethtool_ops;
4236         bond_dev->set_multicast_list = bond_set_multicast_list;
4237         bond_dev->change_mtu = bond_change_mtu;
4238         bond_dev->set_mac_address = bond_set_mac_address;
4239
4240         bond_set_mode_ops(bond, bond->params.mode);
4241
4242         bond_dev->destructor = free_netdev;
4243
4244         /* Initialize the device options */
4245         bond_dev->tx_queue_len = 0;
4246         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4247         bond_dev->priv_flags |= IFF_BONDING;
4248
4249         /* At first, we block adding VLANs. That's the only way to
4250          * prevent problems that occur when adding VLANs over an
4251          * empty bond. The block will be removed once non-challenged
4252          * slaves are enslaved.
4253          */
4254         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4255
4256         /* don't acquire bond device's netif_tx_lock when
4257          * transmitting */
4258         bond_dev->features |= NETIF_F_LLTX;
4259
4260         /* By default, we declare the bond to be fully
4261          * VLAN hardware accelerated capable. Special
4262          * care is taken in the various xmit functions
4263          * when there are slaves that are not hw accel
4264          * capable
4265          */
4266         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4267         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4268         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4269         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4270                                NETIF_F_HW_VLAN_RX |
4271                                NETIF_F_HW_VLAN_FILTER);
4272
4273 #ifdef CONFIG_PROC_FS
4274         bond_create_proc_entry(bond);
4275 #endif
4276
4277         list_add_tail(&bond->bond_list, &bond_dev_list);
4278
4279         return 0;
4280 }
4281
4282 /* De-initialize device specific data.
4283  * Caller must hold rtnl_lock.
4284  */
4285 void bond_deinit(struct net_device *bond_dev)
4286 {
4287         struct bonding *bond = bond_dev->priv;
4288
4289         list_del(&bond->bond_list);
4290
4291 #ifdef CONFIG_PROC_FS
4292         bond_remove_proc_entry(bond);
4293 #endif
4294 }
4295
4296 /* Unregister and free all bond devices.
4297  * Caller must hold rtnl_lock.
4298  */
4299 static void bond_free_all(void)
4300 {
4301         struct bonding *bond, *nxt;
4302
4303         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4304                 struct net_device *bond_dev = bond->dev;
4305
4306                 bond_mc_list_destroy(bond);
4307                 /* Release the bonded slaves */
4308                 bond_release_all(bond_dev);
4309                 bond_deinit(bond_dev);
4310                 unregister_netdevice(bond_dev);
4311         }
4312
4313 #ifdef CONFIG_PROC_FS
4314         bond_destroy_proc_dir();
4315 #endif
4316 }
4317
4318 /*------------------------- Module initialization ---------------------------*/
4319
4320 /*
4321  * Convert string input module parms.  Accept either the
4322  * number of the mode or its string name.
4323  */
4324 int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
4325 {
4326         int i;
4327
4328         for (i = 0; tbl[i].modename; i++) {
4329                 if ((isdigit(*mode_arg) &&
4330                      tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4331                     (strncmp(mode_arg, tbl[i].modename,
4332                              strlen(tbl[i].modename)) == 0)) {
4333                         return tbl[i].mode;
4334                 }
4335         }
4336
4337         return -1;
4338 }
4339
4340 static int bond_check_params(struct bond_params *params)
4341 {
4342         int arp_validate_value;
4343
4344         /*
4345          * Convert string parameters.
4346          */
4347         if (mode) {
4348                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4349                 if (bond_mode == -1) {
4350                         printk(KERN_ERR DRV_NAME
4351                                ": Error: Invalid bonding mode \"%s\"\n",
4352                                mode == NULL ? "NULL" : mode);
4353                         return -EINVAL;
4354                 }
4355         }
4356
4357         if (xmit_hash_policy) {
4358                 if ((bond_mode != BOND_MODE_XOR) &&
4359                     (bond_mode != BOND_MODE_8023AD)) {
4360                         printk(KERN_INFO DRV_NAME
4361                                ": xor_mode param is irrelevant in mode %s\n",
4362                                bond_mode_name(bond_mode));
4363                 } else {
4364                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4365                                                         xmit_hashtype_tbl);
4366                         if (xmit_hashtype == -1) {
4367                                 printk(KERN_ERR DRV_NAME
4368                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4369                                 xmit_hash_policy == NULL ? "NULL" :
4370                                        xmit_hash_policy);
4371                                 return -EINVAL;
4372                         }
4373                 }
4374         }
4375
4376         if (lacp_rate) {
4377                 if (bond_mode != BOND_MODE_8023AD) {
4378                         printk(KERN_INFO DRV_NAME
4379                                ": lacp_rate param is irrelevant in mode %s\n",
4380                                bond_mode_name(bond_mode));
4381                 } else {
4382                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4383                         if (lacp_fast == -1) {
4384                                 printk(KERN_ERR DRV_NAME
4385                                        ": Error: Invalid lacp rate \"%s\"\n",
4386                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4387                                 return -EINVAL;
4388                         }
4389                 }
4390         }
4391
4392         if (max_bonds < 1 || max_bonds > INT_MAX) {
4393                 printk(KERN_WARNING DRV_NAME
4394                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4395                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4396                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4397                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4398         }
4399
4400         if (miimon < 0) {
4401                 printk(KERN_WARNING DRV_NAME
4402                        ": Warning: miimon module parameter (%d), "
4403                        "not in range 0-%d, so it was reset to %d\n",
4404                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4405                 miimon = BOND_LINK_MON_INTERV;
4406         }
4407
4408         if (updelay < 0) {
4409                 printk(KERN_WARNING DRV_NAME
4410                        ": Warning: updelay module parameter (%d), "
4411                        "not in range 0-%d, so it was reset to 0\n",
4412                        updelay, INT_MAX);
4413                 updelay = 0;
4414         }
4415
4416         if (downdelay < 0) {
4417                 printk(KERN_WARNING DRV_NAME
4418                        ": Warning: downdelay module parameter (%d), "
4419                        "not in range 0-%d, so it was reset to 0\n",
4420                        downdelay, INT_MAX);
4421                 downdelay = 0;
4422         }
4423
4424         if ((use_carrier != 0) && (use_carrier != 1)) {
4425                 printk(KERN_WARNING DRV_NAME
4426                        ": Warning: use_carrier module parameter (%d), "
4427                        "not of valid value (0/1), so it was set to 1\n",
4428                        use_carrier);
4429                 use_carrier = 1;
4430         }
4431
4432         /* reset values for 802.3ad */
4433         if (bond_mode == BOND_MODE_8023AD) {
4434                 if (!miimon) {
4435                         printk(KERN_WARNING DRV_NAME
4436                                ": Warning: miimon must be specified, "
4437                                "otherwise bonding will not detect link "
4438                                "failure, speed and duplex which are "
4439                                "essential for 802.3ad operation\n");
4440                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4441                         miimon = 100;
4442                 }
4443         }
4444
4445         /* reset values for TLB/ALB */
4446         if ((bond_mode == BOND_MODE_TLB) ||
4447             (bond_mode == BOND_MODE_ALB)) {
4448                 if (!miimon) {
4449                         printk(KERN_WARNING DRV_NAME
4450                                ": Warning: miimon must be specified, "
4451                                "otherwise bonding will not detect link "
4452                                "failure and link speed which are essential "
4453                                "for TLB/ALB load balancing\n");
4454                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4455                         miimon = 100;
4456                 }
4457         }
4458
4459         if (bond_mode == BOND_MODE_ALB) {
4460                 printk(KERN_NOTICE DRV_NAME
4461                        ": In ALB mode you might experience client "
4462                        "disconnections upon reconnection of a link if the "
4463                        "bonding module updelay parameter (%d msec) is "
4464                        "incompatible with the forwarding delay time of the "
4465                        "switch\n",
4466                        updelay);
4467         }
4468
4469         if (!miimon) {
4470                 if (updelay || downdelay) {
4471                         /* just warn the user the up/down delay will have
4472                          * no effect since miimon is zero...
4473                          */
4474                         printk(KERN_WARNING DRV_NAME
4475                                ": Warning: miimon module parameter not set "
4476                                "and updelay (%d) or downdelay (%d) module "
4477                                "parameter is set; updelay and downdelay have "
4478                                "no effect unless miimon is set\n",
4479                                updelay, downdelay);
4480                 }
4481         } else {
4482                 /* don't allow arp monitoring */
4483                 if (arp_interval) {
4484                         printk(KERN_WARNING DRV_NAME
4485                                ": Warning: miimon (%d) and arp_interval (%d) "
4486                                "can't be used simultaneously, disabling ARP "
4487                                "monitoring\n",
4488                                miimon, arp_interval);
4489                         arp_interval = 0;
4490                 }
4491
4492                 if ((updelay % miimon) != 0) {
4493                         printk(KERN_WARNING DRV_NAME
4494                                ": Warning: updelay (%d) is not a multiple "
4495                                "of miimon (%d), updelay rounded to %d ms\n",
4496                                updelay, miimon, (updelay / miimon) * miimon);
4497                 }
4498
4499                 updelay /= miimon;
4500
4501                 if ((downdelay % miimon) != 0) {
4502                         printk(KERN_WARNING DRV_NAME
4503                                ": Warning: downdelay (%d) is not a multiple "
4504                                "of miimon (%d), downdelay rounded to %d ms\n",
4505                                downdelay, miimon,
4506                                (downdelay / miimon) * miimon);
4507                 }
4508
4509                 downdelay /= miimon;
4510         }
4511
4512         if (arp_interval < 0) {
4513                 printk(KERN_WARNING DRV_NAME
4514                        ": Warning: arp_interval module parameter (%d) "
4515                        ", not in range 0-%d, so it was reset to %d\n",
4516                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4517                 arp_interval = BOND_LINK_ARP_INTERV;
4518         }
4519
4520         for (arp_ip_count = 0;
4521              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4522              arp_ip_count++) {
4523                 /* not complete check, but should be good enough to
4524                    catch mistakes */
4525                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4526                         printk(KERN_WARNING DRV_NAME
4527                                ": Warning: bad arp_ip_target module parameter "
4528                                "(%s), ARP monitoring will not be performed\n",
4529                                arp_ip_target[arp_ip_count]);
4530                         arp_interval = 0;
4531                 } else {
4532                         u32 ip = in_aton(arp_ip_target[arp_ip_count]);
4533                         arp_target[arp_ip_count] = ip;
4534                 }
4535         }
4536
4537         if (arp_interval && !arp_ip_count) {
4538                 /* don't allow arping if no arp_ip_target given... */
4539                 printk(KERN_WARNING DRV_NAME
4540                        ": Warning: arp_interval module parameter (%d) "
4541                        "specified without providing an arp_ip_target "
4542                        "parameter, arp_interval was reset to 0\n",
4543                        arp_interval);
4544                 arp_interval = 0;
4545         }
4546
4547         if (arp_validate) {
4548                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4549                         printk(KERN_ERR DRV_NAME
4550                ": arp_validate only supported in active-backup mode\n");
4551                         return -EINVAL;
4552                 }
4553                 if (!arp_interval) {
4554                         printk(KERN_ERR DRV_NAME
4555                                ": arp_validate requires arp_interval\n");
4556                         return -EINVAL;
4557                 }
4558
4559                 arp_validate_value = bond_parse_parm(arp_validate,
4560                                                      arp_validate_tbl);
4561                 if (arp_validate_value == -1) {
4562                         printk(KERN_ERR DRV_NAME
4563                                ": Error: invalid arp_validate \"%s\"\n",
4564                                arp_validate == NULL ? "NULL" : arp_validate);
4565                         return -EINVAL;
4566                 }
4567         } else
4568                 arp_validate_value = 0;
4569
4570         if (miimon) {
4571                 printk(KERN_INFO DRV_NAME
4572                        ": MII link monitoring set to %d ms\n",
4573                        miimon);
4574         } else if (arp_interval) {
4575                 int i;
4576
4577                 printk(KERN_INFO DRV_NAME
4578                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4579                        arp_interval,
4580                        arp_validate_tbl[arp_validate_value].modename,
4581                        arp_ip_count);
4582
4583                 for (i = 0; i < arp_ip_count; i++)
4584                         printk (" %s", arp_ip_target[i]);
4585
4586                 printk("\n");
4587
4588         } else {
4589                 /* miimon and arp_interval not set, we need one so things
4590                  * work as expected, see bonding.txt for details
4591                  */
4592                 printk(KERN_WARNING DRV_NAME
4593                        ": Warning: either miimon or arp_interval and "
4594                        "arp_ip_target module parameters must be specified, "
4595                        "otherwise bonding will not detect link failures! see "
4596                        "bonding.txt for details.\n");
4597         }
4598
4599         if (primary && !USES_PRIMARY(bond_mode)) {
4600                 /* currently, using a primary only makes sense
4601                  * in active backup, TLB or ALB modes
4602                  */
4603                 printk(KERN_WARNING DRV_NAME
4604                        ": Warning: %s primary device specified but has no "
4605                        "effect in %s mode\n",
4606                        primary, bond_mode_name(bond_mode));
4607                 primary = NULL;
4608         }
4609
4610         /* fill params struct with the proper values */
4611         params->mode = bond_mode;
4612         params->xmit_policy = xmit_hashtype;
4613         params->miimon = miimon;
4614         params->arp_interval = arp_interval;
4615         params->arp_validate = arp_validate_value;
4616         params->updelay = updelay;
4617         params->downdelay = downdelay;
4618         params->use_carrier = use_carrier;
4619         params->lacp_fast = lacp_fast;
4620         params->primary[0] = 0;
4621
4622         if (primary) {
4623                 strncpy(params->primary, primary, IFNAMSIZ);
4624                 params->primary[IFNAMSIZ - 1] = 0;
4625         }
4626
4627         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4628
4629         return 0;
4630 }
4631
4632 static struct lock_class_key bonding_netdev_xmit_lock_key;
4633
4634 /* Create a new bond based on the specified name and bonding parameters.
4635  * If name is NULL, obtain a suitable "bond%d" name for us.
4636  * Caller must NOT hold rtnl_lock; we need to release it here before we
4637  * set up our sysfs entries.
4638  */
4639 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4640 {
4641         struct net_device *bond_dev;
4642         int res;
4643
4644         rtnl_lock();
4645         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4646                                 ether_setup);
4647         if (!bond_dev) {
4648                 printk(KERN_ERR DRV_NAME
4649                        ": %s: eek! can't alloc netdev!\n",
4650                        name);
4651                 res = -ENOMEM;
4652                 goto out_rtnl;
4653         }
4654
4655         if (!name) {
4656                 res = dev_alloc_name(bond_dev, "bond%d");
4657                 if (res < 0)
4658                         goto out_netdev;
4659         }
4660
4661         /* bond_init() must be called after dev_alloc_name() (for the
4662          * /proc files), but before register_netdevice(), because we
4663          * need to set function pointers.
4664          */
4665
4666         res = bond_init(bond_dev, params);
4667         if (res < 0) {
4668                 goto out_netdev;
4669         }
4670
4671         SET_MODULE_OWNER(bond_dev);
4672
4673         res = register_netdevice(bond_dev);
4674         if (res < 0) {
4675                 goto out_bond;
4676         }
4677
4678         lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4679
4680         if (newbond)
4681                 *newbond = bond_dev->priv;
4682
4683         netif_carrier_off(bond_dev);
4684
4685         rtnl_unlock(); /* allows sysfs registration of net device */
4686         res = bond_create_sysfs_entry(bond_dev->priv);
4687         if (res < 0) {
4688                 rtnl_lock();
4689                 goto out_bond;
4690         }
4691
4692         return 0;
4693
4694 out_bond:
4695         bond_deinit(bond_dev);
4696 out_netdev:
4697         free_netdev(bond_dev);
4698 out_rtnl:
4699         rtnl_unlock();
4700         return res;
4701 }
4702
4703 static int __init bonding_init(void)
4704 {
4705         int i;
4706         int res;
4707
4708         printk(KERN_INFO "%s", version);
4709
4710         res = bond_check_params(&bonding_defaults);
4711         if (res) {
4712                 goto out;
4713         }
4714
4715 #ifdef CONFIG_PROC_FS
4716         bond_create_proc_dir();
4717 #endif
4718         for (i = 0; i < max_bonds; i++) {
4719                 res = bond_create(NULL, &bonding_defaults, NULL);
4720                 if (res)
4721                         goto err;
4722         }
4723
4724         res = bond_create_sysfs();
4725         if (res)
4726                 goto err;
4727
4728         register_netdevice_notifier(&bond_netdev_notifier);
4729         register_inetaddr_notifier(&bond_inetaddr_notifier);
4730
4731         goto out;
4732 err:
4733         rtnl_lock();
4734         bond_free_all();
4735         bond_destroy_sysfs();
4736         rtnl_unlock();
4737 out:
4738         return res;
4739
4740 }
4741
4742 static void __exit bonding_exit(void)
4743 {
4744         unregister_netdevice_notifier(&bond_netdev_notifier);
4745         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4746
4747         rtnl_lock();
4748         bond_free_all();
4749         bond_destroy_sysfs();
4750         rtnl_unlock();
4751 }
4752
4753 module_init(bonding_init);
4754 module_exit(bonding_exit);
4755 MODULE_LICENSE("GPL");
4756 MODULE_VERSION(DRV_VERSION);
4757 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4758 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4759 MODULE_SUPPORTED_DEVICE("most ethernet devices");
4760
4761 /*
4762  * Local variables:
4763  *  c-indent-level: 8
4764  *  c-basic-offset: 8
4765  *  tab-width: 8
4766  * End:
4767  */
4768