err.no Git - linux-2.6/blob - drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 //#define BONDING_DEBUG 1
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/ptrace.h>
  42 #include <linux/ioport.h>
  43 #include <linux/in.h>
  44 #include <net/ip.h>
  45 #include <linux/ip.h>
  46 #include <linux/tcp.h>
  47 #include <linux/udp.h>
  48 #include <linux/slab.h>
  49 #include <linux/string.h>
  50 #include <linux/init.h>
  51 #include <linux/timer.h>
  52 #include <linux/socket.h>
  53 #include <linux/ctype.h>
  54 #include <linux/inet.h>
  55 #include <linux/bitops.h>
  56 #include <asm/system.h>
  57 #include <asm/io.h>
  58 #include <asm/dma.h>
  59 #include <asm/uaccess.h>
  60 #include <linux/errno.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/inetdevice.h>
  63 #include <linux/igmp.h>
  64 #include <linux/etherdevice.h>
  65 #include <linux/skbuff.h>
  66 #include <net/sock.h>
  67 #include <linux/rtnetlink.h>
  68 #include <linux/proc_fs.h>
  69 #include <linux/seq_file.h>
  70 #include <linux/smp.h>
  71 #include <linux/if_ether.h>
  72 #include <net/arp.h>
  73 #include <linux/mii.h>
  74 #include <linux/ethtool.h>
  75 #include <linux/if_vlan.h>
  76 #include <linux/if_bonding.h>
  77 #include <linux/jiffies.h>
  78 #include <net/route.h>
  79 #include <net/net_namespace.h>
  80 #include "bonding.h"
  81 #include "bond_3ad.h"
  82 #include "bond_alb.h"
  83
  84 /*---------------------------- Module parameters ----------------------------*/
  85
  86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  87 #define BOND_LINK_MON_INTERV    0
  88 #define BOND_LINK_ARP_INTERV    0
  89
  90 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  91 static int miimon       = BOND_LINK_MON_INTERV;
  92 static int updelay      = 0;
  93 static int downdelay    = 0;
  94 static int use_carrier  = 1;
  95 static char *mode       = NULL;
  96 static char *primary    = NULL;
  97 static char *lacp_rate  = NULL;
  98 static char *xmit_hash_policy = NULL;
  99 static int arp_interval = BOND_LINK_ARP_INTERV;
 100 static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
 101 static char *arp_validate = NULL;
 102 static int fail_over_mac = 0;
 103 struct bond_params bonding_defaults;
 104
 105 module_param(max_bonds, int, 0);
 106 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 107 module_param(miimon, int, 0);
 108 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 109 module_param(updelay, int, 0);
 110 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 111 module_param(downdelay, int, 0);
 112 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 113                             "in milliseconds");
 114 module_param(use_carrier, int, 0);
 115 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 116                               "0 for off, 1 for on (default)");
 117 module_param(mode, charp, 0);
 118 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 119                        "1 for active-backup, 2 for balance-xor, "
 120                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 121                        "6 for balance-alb");
 122 module_param(primary, charp, 0);
 123 MODULE_PARM_DESC(primary, "Primary network device to use");
 124 module_param(lacp_rate, charp, 0);
 125 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 126                             "(slow/fast)");
 127 module_param(xmit_hash_policy, charp, 0);
 128 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 129                                    ", 1 for layer 3+4");
 130 module_param(arp_interval, int, 0);
 131 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 132 module_param_array(arp_ip_target, charp, NULL, 0);
 133 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 134 module_param(arp_validate, charp, 0);
 135 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 136 module_param(fail_over_mac, int, 0);
 137 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  0 of off (default), 1 for on.");
 138
 139 /*----------------------------- Global variables ----------------------------*/
 140
 141 static const char * const version =
 142         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 143
 144 LIST_HEAD(bond_dev_list);
 145
 146 #ifdef CONFIG_PROC_FS
 147 static struct proc_dir_entry *bond_proc_dir = NULL;
 148 #endif
 149
 150 extern struct rw_semaphore bonding_rwsem;
 151 static __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
 152 static int arp_ip_count = 0;
 153 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 154 static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
 155 static int lacp_fast    = 0;
 156
 157
 158 struct bond_parm_tbl bond_lacp_tbl[] = {
 159 {       "slow",         AD_LACP_SLOW},
 160 {       "fast",         AD_LACP_FAST},
 161 {       NULL,           -1},
 162 };
 163
 164 struct bond_parm_tbl bond_mode_tbl[] = {
 165 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 166 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 167 {       "balance-xor",          BOND_MODE_XOR},
 168 {       "broadcast",            BOND_MODE_BROADCAST},
 169 {       "802.3ad",              BOND_MODE_8023AD},
 170 {       "balance-tlb",          BOND_MODE_TLB},
 171 {       "balance-alb",          BOND_MODE_ALB},
 172 {       NULL,                   -1},
 173 };
 174
 175 struct bond_parm_tbl xmit_hashtype_tbl[] = {
 176 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 177 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 178 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 179 {       NULL,                   -1},
 180 };
 181
 182 struct bond_parm_tbl arp_validate_tbl[] = {
 183 {       "none",                 BOND_ARP_VALIDATE_NONE},
 184 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 185 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 186 {       "all",                  BOND_ARP_VALIDATE_ALL},
 187 {       NULL,                   -1},
 188 };
 189
 190 /*-------------------------- Forward declarations ---------------------------*/
 191
 192 static void bond_send_gratuitous_arp(struct bonding *bond);
 193 static void bond_deinit(struct net_device *bond_dev);
 194
 195 /*---------------------------- General routines -----------------------------*/
 196
 197 static const char *bond_mode_name(int mode)
 198 {
 199         switch (mode) {
 200         case BOND_MODE_ROUNDROBIN :
 201                 return "load balancing (round-robin)";
 202         case BOND_MODE_ACTIVEBACKUP :
 203                 return "fault-tolerance (active-backup)";
 204         case BOND_MODE_XOR :
 205                 return "load balancing (xor)";
 206         case BOND_MODE_BROADCAST :
 207                 return "fault-tolerance (broadcast)";
 208         case BOND_MODE_8023AD:
 209                 return "IEEE 802.3ad Dynamic link aggregation";
 210         case BOND_MODE_TLB:
 211                 return "transmit load balancing";
 212         case BOND_MODE_ALB:
 213                 return "adaptive load balancing";
 214         default:
 215                 return "unknown";
 216         }
 217 }
 218
 219 /*---------------------------------- VLAN -----------------------------------*/
 220
 221 /**
 222  * bond_add_vlan - add a new vlan id on bond
 223  * @bond: bond that got the notification
 224  * @vlan_id: the vlan id to add
 225  *
 226  * Returns -ENOMEM if allocation failed.
 227  */
 228 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 229 {
 230         struct vlan_entry *vlan;
 231
 232         dprintk("bond: %s, vlan id %d\n",
 233                 (bond ? bond->dev->name: "None"), vlan_id);
 234
 235         vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 236         if (!vlan) {
 237                 return -ENOMEM;
 238         }
 239
 240         INIT_LIST_HEAD(&vlan->vlan_list);
 241         vlan->vlan_id = vlan_id;
 242         vlan->vlan_ip = 0;
 243
 244         write_lock_bh(&bond->lock);
 245
 246         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 247
 248         write_unlock_bh(&bond->lock);
 249
 250         dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 251
 252         return 0;
 253 }
 254
 255 /**
 256  * bond_del_vlan - delete a vlan id from bond
 257  * @bond: bond that got the notification
 258  * @vlan_id: the vlan id to delete
 259  *
 260  * returns -ENODEV if @vlan_id was not found in @bond.
 261  */
 262 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 263 {
 264         struct vlan_entry *vlan, *next;
 265         int res = -ENODEV;
 266
 267         dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 268
 269         write_lock_bh(&bond->lock);
 270
 271         list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
 272                 if (vlan->vlan_id == vlan_id) {
 273                         list_del(&vlan->vlan_list);
 274
 275                         if ((bond->params.mode == BOND_MODE_TLB) ||
 276                             (bond->params.mode == BOND_MODE_ALB)) {
 277                                 bond_alb_clear_vlan(bond, vlan_id);
 278                         }
 279
 280                         dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
 281                                 bond->dev->name);
 282
 283                         kfree(vlan);
 284
 285                         if (list_empty(&bond->vlan_list) &&
 286                             (bond->slave_cnt == 0)) {
 287                                 /* Last VLAN removed and no slaves, so
 288                                  * restore block on adding VLANs. This will
 289                                  * be removed once new slaves that are not
 290                                  * VLAN challenged will be added.
 291                                  */
 292                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 293                         }
 294
 295                         res = 0;
 296                         goto out;
 297                 }
 298         }
 299
 300         dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
 301                 bond->dev->name);
 302
 303 out:
 304         write_unlock_bh(&bond->lock);
 305         return res;
 306 }
 307
 308 /**
 309  * bond_has_challenged_slaves
 310  * @bond: the bond we're working on
 311  *
 312  * Searches the slave list. Returns 1 if a vlan challenged slave
 313  * was found, 0 otherwise.
 314  *
 315  * Assumes bond->lock is held.
 316  */
 317 static int bond_has_challenged_slaves(struct bonding *bond)
 318 {
 319         struct slave *slave;
 320         int i;
 321
 322         bond_for_each_slave(bond, slave, i) {
 323                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 324                         dprintk("found VLAN challenged slave - %s\n",
 325                                 slave->dev->name);
 326                         return 1;
 327                 }
 328         }
 329
 330         dprintk("no VLAN challenged slaves found\n");
 331         return 0;
 332 }
 333
 334 /**
 335  * bond_next_vlan - safely skip to the next item in the vlans list.
 336  * @bond: the bond we're working on
 337  * @curr: item we're advancing from
 338  *
 339  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 340  * or @curr->next otherwise (even if it is @curr itself again).
 341  *
 342  * Caller must hold bond->lock
 343  */
 344 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 345 {
 346         struct vlan_entry *next, *last;
 347
 348         if (list_empty(&bond->vlan_list)) {
 349                 return NULL;
 350         }
 351
 352         if (!curr) {
 353                 next = list_entry(bond->vlan_list.next,
 354                                   struct vlan_entry, vlan_list);
 355         } else {
 356                 last = list_entry(bond->vlan_list.prev,
 357                                   struct vlan_entry, vlan_list);
 358                 if (last == curr) {
 359                         next = list_entry(bond->vlan_list.next,
 360                                           struct vlan_entry, vlan_list);
 361                 } else {
 362                         next = list_entry(curr->vlan_list.next,
 363                                           struct vlan_entry, vlan_list);
 364                 }
 365         }
 366
 367         return next;
 368 }
 369
 370 /**
 371  * bond_dev_queue_xmit - Prepare skb for xmit.
 372  *
 373  * @bond: bond device that got this skb for tx.
 374  * @skb: hw accel VLAN tagged skb to transmit
 375  * @slave_dev: slave that is supposed to xmit this skbuff
 376  *
 377  * When the bond gets an skb to transmit that is
 378  * already hardware accelerated VLAN tagged, and it
 379  * needs to relay this skb to a slave that is not
 380  * hw accel capable, the skb needs to be "unaccelerated",
 381  * i.e. strip the hwaccel tag and re-insert it as part
 382  * of the payload.
 383  */
 384 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
 385 {
 386         unsigned short vlan_id;
 387
 388         if (!list_empty(&bond->vlan_list) &&
 389             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 390             vlan_get_tag(skb, &vlan_id) == 0) {
 391                 skb->dev = slave_dev;
 392                 skb = vlan_put_tag(skb, vlan_id);
 393                 if (!skb) {
 394                         /* vlan_put_tag() frees the skb in case of error,
 395                          * so return success here so the calling functions
 396                          * won't attempt to free is again.
 397                          */
 398                         return 0;
 399                 }
 400         } else {
 401                 skb->dev = slave_dev;
 402         }
 403
 404         skb->priority = 1;
 405         dev_queue_xmit(skb);
 406
 407         return 0;
 408 }
 409
 410 /*
 411  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 412  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 413  * lock because:
 414  * a. This operation is performed in IOCTL context,
 415  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 416  * c. Holding a lock with BH disabled while directly calling a base driver
 417  *    entry point is generally a BAD idea.
 418  *
 419  * The design of synchronization/protection for this operation in the 8021q
 420  * module is good for one or more VLAN devices over a single physical device
 421  * and cannot be extended for a teaming solution like bonding, so there is a
 422  * potential race condition here where a net device from the vlan group might
 423  * be referenced (either by a base driver or the 8021q code) while it is being
 424  * removed from the system. However, it turns out we're not making matters
 425  * worse, and if it works for regular VLAN usage it will work here too.
 426 */
 427
 428 /**
 429  * bond_vlan_rx_register - Propagates registration to slaves
 430  * @bond_dev: bonding net device that got called
 431  * @grp: vlan group being registered
 432  */
 433 static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
 434 {
 435         struct bonding *bond = bond_dev->priv;
 436         struct slave *slave;
 437         int i;
 438
 439         bond->vlgrp = grp;
 440
 441         bond_for_each_slave(bond, slave, i) {
 442                 struct net_device *slave_dev = slave->dev;
 443
 444                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 445                     slave_dev->vlan_rx_register) {
 446                         slave_dev->vlan_rx_register(slave_dev, grp);
 447                 }
 448         }
 449 }
 450
 451 /**
 452  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 453  * @bond_dev: bonding net device that got called
 454  * @vid: vlan id being added
 455  */
 456 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 457 {
 458         struct bonding *bond = bond_dev->priv;
 459         struct slave *slave;
 460         int i, res;
 461
 462         bond_for_each_slave(bond, slave, i) {
 463                 struct net_device *slave_dev = slave->dev;
 464
 465                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 466                     slave_dev->vlan_rx_add_vid) {
 467                         slave_dev->vlan_rx_add_vid(slave_dev, vid);
 468                 }
 469         }
 470
 471         res = bond_add_vlan(bond, vid);
 472         if (res) {
 473                 printk(KERN_ERR DRV_NAME
 474                        ": %s: Error: Failed to add vlan id %d\n",
 475                        bond_dev->name, vid);
 476         }
 477 }
 478
 479 /**
 480  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 481  * @bond_dev: bonding net device that got called
 482  * @vid: vlan id being removed
 483  */
 484 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 485 {
 486         struct bonding *bond = bond_dev->priv;
 487         struct slave *slave;
 488         struct net_device *vlan_dev;
 489         int i, res;
 490
 491         bond_for_each_slave(bond, slave, i) {
 492                 struct net_device *slave_dev = slave->dev;
 493
 494                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 495                     slave_dev->vlan_rx_kill_vid) {
 496                         /* Save and then restore vlan_dev in the grp array,
 497                          * since the slave's driver might clear it.
 498                          */
 499                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
 500                         slave_dev->vlan_rx_kill_vid(slave_dev, vid);
 501                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
 502                 }
 503         }
 504
 505         res = bond_del_vlan(bond, vid);
 506         if (res) {
 507                 printk(KERN_ERR DRV_NAME
 508                        ": %s: Error: Failed to remove vlan id %d\n",
 509                        bond_dev->name, vid);
 510         }
 511 }
 512
 513 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 514 {
 515         struct vlan_entry *vlan;
 516
 517         write_lock_bh(&bond->lock);
 518
 519         if (list_empty(&bond->vlan_list)) {
 520                 goto out;
 521         }
 522
 523         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 524             slave_dev->vlan_rx_register) {
 525                 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
 526         }
 527
 528         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 529             !(slave_dev->vlan_rx_add_vid)) {
 530                 goto out;
 531         }
 532
 533         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 534                 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 535         }
 536
 537 out:
 538         write_unlock_bh(&bond->lock);
 539 }
 540
 541 static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
 542 {
 543         struct vlan_entry *vlan;
 544         struct net_device *vlan_dev;
 545
 546         write_lock_bh(&bond->lock);
 547
 548         if (list_empty(&bond->vlan_list)) {
 549                 goto out;
 550         }
 551
 552         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 553             !(slave_dev->vlan_rx_kill_vid)) {
 554                 goto unreg;
 555         }
 556
 557         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 558                 /* Save and then restore vlan_dev in the grp array,
 559                  * since the slave's driver might clear it.
 560                  */
 561                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
 562                 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 563                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
 564         }
 565
 566 unreg:
 567         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 568             slave_dev->vlan_rx_register) {
 569                 slave_dev->vlan_rx_register(slave_dev, NULL);
 570         }
 571
 572 out:
 573         write_unlock_bh(&bond->lock);
 574 }
 575
 576 /*------------------------------- Link status -------------------------------*/
 577
 578 /*
 579  * Set the carrier state for the master according to the state of its
 580  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 581  * do special 802.3ad magic.
 582  *
 583  * Returns zero if carrier state does not change, nonzero if it does.
 584  */
 585 static int bond_set_carrier(struct bonding *bond)
 586 {
 587         struct slave *slave;
 588         int i;
 589
 590         if (bond->slave_cnt == 0)
 591                 goto down;
 592
 593         if (bond->params.mode == BOND_MODE_8023AD)
 594                 return bond_3ad_set_carrier(bond);
 595
 596         bond_for_each_slave(bond, slave, i) {
 597                 if (slave->link == BOND_LINK_UP) {
 598                         if (!netif_carrier_ok(bond->dev)) {
 599                                 netif_carrier_on(bond->dev);
 600                                 return 1;
 601                         }
 602                         return 0;
 603                 }
 604         }
 605
 606 down:
 607         if (netif_carrier_ok(bond->dev)) {
 608                 netif_carrier_off(bond->dev);
 609                 return 1;
 610         }
 611         return 0;
 612 }
 613
 614 /*
 615  * Get link speed and duplex from the slave's base driver
 616  * using ethtool. If for some reason the call fails or the
 617  * values are invalid, fake speed and duplex to 100/Full
 618  * and return error.
 619  */
 620 static int bond_update_speed_duplex(struct slave *slave)
 621 {
 622         struct net_device *slave_dev = slave->dev;
 623         struct ethtool_cmd etool;
 624         int res;
 625
 626         /* Fake speed and duplex */
 627         slave->speed = SPEED_100;
 628         slave->duplex = DUPLEX_FULL;
 629
 630         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
 631                 return -1;
 632
 633         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 634         if (res < 0)
 635                 return -1;
 636
 637         switch (etool.speed) {
 638         case SPEED_10:
 639         case SPEED_100:
 640         case SPEED_1000:
 641         case SPEED_10000:
 642                 break;
 643         default:
 644                 return -1;
 645         }
 646
 647         switch (etool.duplex) {
 648         case DUPLEX_FULL:
 649         case DUPLEX_HALF:
 650                 break;
 651         default:
 652                 return -1;
 653         }
 654
 655         slave->speed = etool.speed;
 656         slave->duplex = etool.duplex;
 657
 658         return 0;
 659 }
 660
 661 /*
 662  * if <dev> supports MII link status reporting, check its link status.
 663  *
 664  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 665  * depening upon the setting of the use_carrier parameter.
 666  *
 667  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 668  * can't tell and just pretend it is), or 0, meaning that the link is
 669  * down.
 670  *
 671  * If reporting is non-zero, instead of faking link up, return -1 if
 672  * both ETHTOOL and MII ioctls fail (meaning the device does not
 673  * support them).  If use_carrier is set, return whatever it says.
 674  * It'd be nice if there was a good way to tell if a driver supports
 675  * netif_carrier, but there really isn't.
 676  */
 677 static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
 678 {
 679         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 680         struct ifreq ifr;
 681         struct mii_ioctl_data *mii;
 682
 683         if (bond->params.use_carrier) {
 684                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 685         }
 686
 687         ioctl = slave_dev->do_ioctl;
 688         if (ioctl) {
 689                 /* TODO: set pointer to correct ioctl on a per team member */
 690                 /*       bases to make this more efficient. that is, once  */
 691                 /*       we determine the correct ioctl, we will always    */
 692                 /*       call it and not the others for that team          */
 693                 /*       member.                                           */
 694
 695                 /*
 696                  * We cannot assume that SIOCGMIIPHY will also read a
 697                  * register; not all network drivers (e.g., e100)
 698                  * support that.
 699                  */
 700
 701                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 702                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 703                 mii = if_mii(&ifr);
 704                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 705                         mii->reg_num = MII_BMSR;
 706                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
 707                                 return (mii->val_out & BMSR_LSTATUS);
 708                         }
 709                 }
 710         }
 711
 712         /*
 713          * Some drivers cache ETHTOOL_GLINK for a period of time so we only
 714          * attempt to get link status from it if the above MII ioctls fail.
 715          */
 716         if (slave_dev->ethtool_ops) {
 717                 if (slave_dev->ethtool_ops->get_link) {
 718                         u32 link;
 719
 720                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 721
 722                         return link ? BMSR_LSTATUS : 0;
 723                 }
 724         }
 725
 726         /*
 727          * If reporting, report that either there's no dev->do_ioctl,
 728          * or both SIOCGMIIREG and get_link failed (meaning that we
 729          * cannot report link status).  If not reporting, pretend
 730          * we're ok.
 731          */
 732         return (reporting ? -1 : BMSR_LSTATUS);
 733 }
 734
 735 /*----------------------------- Multicast list ------------------------------*/
 736
 737 /*
 738  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
 739  */
 740 static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
 741 {
 742         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
 743                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
 744 }
 745
 746 /*
 747  * returns dmi entry if found, NULL otherwise
 748  */
 749 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
 750 {
 751         struct dev_mc_list *idmi;
 752
 753         for (idmi = mc_list; idmi; idmi = idmi->next) {
 754                 if (bond_is_dmi_same(dmi, idmi)) {
 755                         return idmi;
 756                 }
 757         }
 758
 759         return NULL;
 760 }
 761
 762 /*
 763  * Push the promiscuity flag down to appropriate slaves
 764  */
 765 static void bond_set_promiscuity(struct bonding *bond, int inc)
 766 {
 767         if (USES_PRIMARY(bond->params.mode)) {
 768                 /* write lock already acquired */
 769                 if (bond->curr_active_slave) {
 770                         dev_set_promiscuity(bond->curr_active_slave->dev, inc);
 771                 }
 772         } else {
 773                 struct slave *slave;
 774                 int i;
 775                 bond_for_each_slave(bond, slave, i) {
 776                         dev_set_promiscuity(slave->dev, inc);
 777                 }
 778         }
 779 }
 780
 781 /*
 782  * Push the allmulti flag down to all slaves
 783  */
 784 static void bond_set_allmulti(struct bonding *bond, int inc)
 785 {
 786         if (USES_PRIMARY(bond->params.mode)) {
 787                 /* write lock already acquired */
 788                 if (bond->curr_active_slave) {
 789                         dev_set_allmulti(bond->curr_active_slave->dev, inc);
 790                 }
 791         } else {
 792                 struct slave *slave;
 793                 int i;
 794                 bond_for_each_slave(bond, slave, i) {
 795                         dev_set_allmulti(slave->dev, inc);
 796                 }
 797         }
 798 }
 799
 800 /*
 801  * Add a Multicast address to slaves
 802  * according to mode
 803  */
 804 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
 805 {
 806         if (USES_PRIMARY(bond->params.mode)) {
 807                 /* write lock already acquired */
 808                 if (bond->curr_active_slave) {
 809                         dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
 810                 }
 811         } else {
 812                 struct slave *slave;
 813                 int i;
 814                 bond_for_each_slave(bond, slave, i) {
 815                         dev_mc_add(slave->dev, addr, alen, 0);
 816                 }
 817         }
 818 }
 819
 820 /*
 821  * Remove a multicast address from slave
 822  * according to mode
 823  */
 824 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
 825 {
 826         if (USES_PRIMARY(bond->params.mode)) {
 827                 /* write lock already acquired */
 828                 if (bond->curr_active_slave) {
 829                         dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
 830                 }
 831         } else {
 832                 struct slave *slave;
 833                 int i;
 834                 bond_for_each_slave(bond, slave, i) {
 835                         dev_mc_delete(slave->dev, addr, alen, 0);
 836                 }
 837         }
 838 }
 839
 840
 841 /*
 842  * Retrieve the list of registered multicast addresses for the bonding
 843  * device and retransmit an IGMP JOIN request to the current active
 844  * slave.
 845  */
 846 static void bond_resend_igmp_join_requests(struct bonding *bond)
 847 {
 848         struct in_device *in_dev;
 849         struct ip_mc_list *im;
 850
 851         rcu_read_lock();
 852         in_dev = __in_dev_get_rcu(bond->dev);
 853         if (in_dev) {
 854                 for (im = in_dev->mc_list; im; im = im->next) {
 855                         ip_mc_rejoin_group(im);
 856                 }
 857         }
 858
 859         rcu_read_unlock();
 860 }
 861
 862 /*
 863  * Totally destroys the mc_list in bond
 864  */
 865 static void bond_mc_list_destroy(struct bonding *bond)
 866 {
 867         struct dev_mc_list *dmi;
 868
 869         dmi = bond->mc_list;
 870         while (dmi) {
 871                 bond->mc_list = dmi->next;
 872                 kfree(dmi);
 873                 dmi = bond->mc_list;
 874         }
 875         bond->mc_list = NULL;
 876 }
 877
 878 /*
 879  * Copy all the Multicast addresses from src to the bonding device dst
 880  */
 881 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
 882                              gfp_t gfp_flag)
 883 {
 884         struct dev_mc_list *dmi, *new_dmi;
 885
 886         for (dmi = mc_list; dmi; dmi = dmi->next) {
 887                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
 888
 889                 if (!new_dmi) {
 890                         /* FIXME: Potential memory leak !!! */
 891                         return -ENOMEM;
 892                 }
 893
 894                 new_dmi->next = bond->mc_list;
 895                 bond->mc_list = new_dmi;
 896                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
 897                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
 898                 new_dmi->dmi_users = dmi->dmi_users;
 899                 new_dmi->dmi_gusers = dmi->dmi_gusers;
 900         }
 901
 902         return 0;
 903 }
 904
 905 /*
 906  * flush all members of flush->mc_list from device dev->mc_list
 907  */
 908 static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
 909 {
 910         struct bonding *bond = bond_dev->priv;
 911         struct dev_mc_list *dmi;
 912
 913         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
 914                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 915         }
 916
 917         if (bond->params.mode == BOND_MODE_8023AD) {
 918                 /* del lacpdu mc addr from mc list */
 919                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 920
 921                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
 922         }
 923 }
 924
 925 /*--------------------------- Active slave change ---------------------------*/
 926
 927 /*
 928  * Update the mc list and multicast-related flags for the new and
 929  * old active slaves (if any) according to the multicast mode, and
 930  * promiscuous flags unconditionally.
 931  */
 932 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
 933 {
 934         struct dev_mc_list *dmi;
 935
 936         if (!USES_PRIMARY(bond->params.mode)) {
 937                 /* nothing to do -  mc list is already up-to-date on
 938                  * all slaves
 939                  */
 940                 return;
 941         }
 942
 943         if (old_active) {
 944                 if (bond->dev->flags & IFF_PROMISC) {
 945                         dev_set_promiscuity(old_active->dev, -1);
 946                 }
 947
 948                 if (bond->dev->flags & IFF_ALLMULTI) {
 949                         dev_set_allmulti(old_active->dev, -1);
 950                 }
 951
 952                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 953                         dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 954                 }
 955         }
 956
 957         if (new_active) {
 958                 if (bond->dev->flags & IFF_PROMISC) {
 959                         dev_set_promiscuity(new_active->dev, 1);
 960                 }
 961
 962                 if (bond->dev->flags & IFF_ALLMULTI) {
 963                         dev_set_allmulti(new_active->dev, 1);
 964                 }
 965
 966                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 967                         dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 968                 }
 969                 bond_resend_igmp_join_requests(bond);
 970         }
 971 }
 972
 973 /**
 974  * find_best_interface - select the best available slave to be the active one
 975  * @bond: our bonding struct
 976  *
 977  * Warning: Caller must hold curr_slave_lock for writing.
 978  */
 979 static struct slave *bond_find_best_slave(struct bonding *bond)
 980 {
 981         struct slave *new_active, *old_active;
 982         struct slave *bestslave = NULL;
 983         int mintime = bond->params.updelay;
 984         int i;
 985
 986         new_active = old_active = bond->curr_active_slave;
 987
 988         if (!new_active) { /* there were no active slaves left */
 989                 if (bond->slave_cnt > 0) {  /* found one slave */
 990                         new_active = bond->first_slave;
 991                 } else {
 992                         return NULL; /* still no slave, return NULL */
 993                 }
 994         }
 995
 996         /* first try the primary link; if arping, a link must tx/rx traffic
 997          * before it can be considered the curr_active_slave - also, we would skip
 998          * slaves between the curr_active_slave and primary_slave that may be up
 999          * and able to arp
1000          */
1001         if ((bond->primary_slave) &&
1002             (!bond->params.arp_interval) &&
1003             (IS_UP(bond->primary_slave->dev))) {
1004                 new_active = bond->primary_slave;
1005         }
1006
1007         /* remember where to stop iterating over the slaves */
1008         old_active = new_active;
1009
1010         bond_for_each_slave_from(bond, new_active, i, old_active) {
1011                 if (IS_UP(new_active->dev)) {
1012                         if (new_active->link == BOND_LINK_UP) {
1013                                 return new_active;
1014                         } else if (new_active->link == BOND_LINK_BACK) {
1015                                 /* link up, but waiting for stabilization */
1016                                 if (new_active->delay < mintime) {
1017                                         mintime = new_active->delay;
1018                                         bestslave = new_active;
1019                                 }
1020                         }
1021                 }
1022         }
1023
1024         return bestslave;
1025 }
1026
1027 /**
1028  * change_active_interface - change the active slave into the specified one
1029  * @bond: our bonding struct
1030  * @new: the new slave to make the active one
1031  *
1032  * Set the new slave to the bond's settings and unset them on the old
1033  * curr_active_slave.
1034  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1035  *
1036  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1037  * because it is apparently the best available slave we have, even though its
1038  * updelay hasn't timed out yet.
1039  *
1040  * Warning: Caller must hold curr_slave_lock for writing.
1041  */
1042 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1043 {
1044         struct slave *old_active = bond->curr_active_slave;
1045
1046         if (old_active == new_active) {
1047                 return;
1048         }
1049
1050         if (new_active) {
1051                 if (new_active->link == BOND_LINK_BACK) {
1052                         if (USES_PRIMARY(bond->params.mode)) {
1053                                 printk(KERN_INFO DRV_NAME
1054                                        ": %s: making interface %s the new "
1055                                        "active one %d ms earlier.\n",
1056                                        bond->dev->name, new_active->dev->name,
1057                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1058                         }
1059
1060                         new_active->delay = 0;
1061                         new_active->link = BOND_LINK_UP;
1062                         new_active->jiffies = jiffies;
1063
1064                         if (bond->params.mode == BOND_MODE_8023AD) {
1065                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1066                         }
1067
1068                         if ((bond->params.mode == BOND_MODE_TLB) ||
1069                             (bond->params.mode == BOND_MODE_ALB)) {
1070                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1071                         }
1072                 } else {
1073                         if (USES_PRIMARY(bond->params.mode)) {
1074                                 printk(KERN_INFO DRV_NAME
1075                                        ": %s: making interface %s the new "
1076                                        "active one.\n",
1077                                        bond->dev->name, new_active->dev->name);
1078                         }
1079                 }
1080         }
1081
1082         if (USES_PRIMARY(bond->params.mode)) {
1083                 bond_mc_swap(bond, new_active, old_active);
1084         }
1085
1086         if ((bond->params.mode == BOND_MODE_TLB) ||
1087             (bond->params.mode == BOND_MODE_ALB)) {
1088                 bond_alb_handle_active_change(bond, new_active);
1089                 if (old_active)
1090                         bond_set_slave_inactive_flags(old_active);
1091                 if (new_active)
1092                         bond_set_slave_active_flags(new_active);
1093         } else {
1094                 bond->curr_active_slave = new_active;
1095         }
1096
1097         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1098                 if (old_active) {
1099                         bond_set_slave_inactive_flags(old_active);
1100                 }
1101
1102                 if (new_active) {
1103                         bond_set_slave_active_flags(new_active);
1104                 }
1105
1106                 /* when bonding does not set the slave MAC address, the bond MAC
1107                  * address is the one of the active slave.
1108                  */
1109                 if (new_active && bond->params.fail_over_mac)
1110                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
1111                                 new_active->dev->addr_len);
1112                 if (bond->curr_active_slave &&
1113                         test_bit(__LINK_STATE_LINKWATCH_PENDING,
1114                                         &bond->curr_active_slave->dev->state)) {
1115                         dprintk("delaying gratuitous arp on %s\n",
1116                                 bond->curr_active_slave->dev->name);
1117                         bond->send_grat_arp = 1;
1118                 } else
1119                         bond_send_gratuitous_arp(bond);
1120         }
1121 }
1122
1123 /**
1124  * bond_select_active_slave - select a new active slave, if needed
1125  * @bond: our bonding struct
1126  *
1127  * This functions shoud be called when one of the following occurs:
1128  * - The old curr_active_slave has been released or lost its link.
1129  * - The primary_slave has got its link back.
1130  * - A slave has got its link back and there's no old curr_active_slave.
1131  *
1132  * Warning: Caller must hold curr_slave_lock for writing.
1133  */
1134 void bond_select_active_slave(struct bonding *bond)
1135 {
1136         struct slave *best_slave;
1137         int rv;
1138
1139         best_slave = bond_find_best_slave(bond);
1140         if (best_slave != bond->curr_active_slave) {
1141                 bond_change_active_slave(bond, best_slave);
1142                 rv = bond_set_carrier(bond);
1143                 if (!rv)
1144                         return;
1145
1146                 if (netif_carrier_ok(bond->dev)) {
1147                         printk(KERN_INFO DRV_NAME
1148                                ": %s: first active interface up!\n",
1149                                bond->dev->name);
1150                 } else {
1151                         printk(KERN_INFO DRV_NAME ": %s: "
1152                                "now running without any active interface !\n",
1153                                bond->dev->name);
1154                 }
1155         }
1156 }
1157
1158 /*--------------------------- slave list handling ---------------------------*/
1159
1160 /*
1161  * This function attaches the slave to the end of list.
1162  *
1163  * bond->lock held for writing by caller.
1164  */
1165 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1166 {
1167         if (bond->first_slave == NULL) { /* attaching the first slave */
1168                 new_slave->next = new_slave;
1169                 new_slave->prev = new_slave;
1170                 bond->first_slave = new_slave;
1171         } else {
1172                 new_slave->next = bond->first_slave;
1173                 new_slave->prev = bond->first_slave->prev;
1174                 new_slave->next->prev = new_slave;
1175                 new_slave->prev->next = new_slave;
1176         }
1177
1178         bond->slave_cnt++;
1179 }
1180
1181 /*
1182  * This function detaches the slave from the list.
1183  * WARNING: no check is made to verify if the slave effectively
1184  * belongs to <bond>.
1185  * Nothing is freed on return, structures are just unchained.
1186  * If any slave pointer in bond was pointing to <slave>,
1187  * it should be changed by the calling function.
1188  *
1189  * bond->lock held for writing by caller.
1190  */
1191 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1192 {
1193         if (slave->next) {
1194                 slave->next->prev = slave->prev;
1195         }
1196
1197         if (slave->prev) {
1198                 slave->prev->next = slave->next;
1199         }
1200
1201         if (bond->first_slave == slave) { /* slave is the first slave */
1202                 if (bond->slave_cnt > 1) { /* there are more slave */
1203                         bond->first_slave = slave->next;
1204                 } else {
1205                         bond->first_slave = NULL; /* slave was the last one */
1206                 }
1207         }
1208
1209         slave->next = NULL;
1210         slave->prev = NULL;
1211         bond->slave_cnt--;
1212 }
1213
1214 /*---------------------------------- IOCTL ----------------------------------*/
1215
1216 static int bond_sethwaddr(struct net_device *bond_dev,
1217                           struct net_device *slave_dev)
1218 {
1219         dprintk("bond_dev=%p\n", bond_dev);
1220         dprintk("slave_dev=%p\n", slave_dev);
1221         dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1222         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1223         return 0;
1224 }
1225
1226 #define BOND_VLAN_FEATURES \
1227         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1228          NETIF_F_HW_VLAN_FILTER)
1229
1230 /*
1231  * Compute the common dev->feature set available to all slaves.  Some
1232  * feature bits are managed elsewhere, so preserve those feature bits
1233  * on the master device.
1234  */
1235 static int bond_compute_features(struct bonding *bond)
1236 {
1237         struct slave *slave;
1238         struct net_device *bond_dev = bond->dev;
1239         unsigned long features = bond_dev->features;
1240         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1241                                                 bond_dev->hard_header_len);
1242         int i;
1243
1244         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1245         features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
1246                     NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1247
1248         bond_for_each_slave(bond, slave, i) {
1249                 features = netdev_compute_features(features,
1250                                                    slave->dev->features);
1251                 if (slave->dev->hard_header_len > max_hard_header_len)
1252                         max_hard_header_len = slave->dev->hard_header_len;
1253         }
1254
1255         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1256         bond_dev->features = features;
1257         bond_dev->hard_header_len = max_hard_header_len;
1258
1259         return 0;
1260 }
1261
1262
1263 static void bond_setup_by_slave(struct net_device *bond_dev,
1264                                 struct net_device *slave_dev)
1265 {
1266         struct bonding *bond = bond_dev->priv;
1267
1268         bond_dev->neigh_setup           = slave_dev->neigh_setup;
1269         bond_dev->header_ops            = slave_dev->header_ops;
1270
1271         bond_dev->type              = slave_dev->type;
1272         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1273         bond_dev->addr_len          = slave_dev->addr_len;
1274
1275         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1276                 slave_dev->addr_len);
1277         bond->setup_by_slave = 1;
1278 }
1279
1280 /* enslave device <slave> to bond device <master> */
1281 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1282 {
1283         struct bonding *bond = bond_dev->priv;
1284         struct slave *new_slave = NULL;
1285         struct dev_mc_list *dmi;
1286         struct sockaddr addr;
1287         int link_reporting;
1288         int old_features = bond_dev->features;
1289         int res = 0;
1290
1291         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1292                 slave_dev->do_ioctl == NULL) {
1293                 printk(KERN_WARNING DRV_NAME
1294                        ": %s: Warning: no link monitoring support for %s\n",
1295                        bond_dev->name, slave_dev->name);
1296         }
1297
1298         /* bond must be initialized by bond_open() before enslaving */
1299         if (!(bond_dev->flags & IFF_UP)) {
1300                 printk(KERN_WARNING DRV_NAME
1301                         " %s: master_dev is not up in bond_enslave\n",
1302                         bond_dev->name);
1303         }
1304
1305         /* already enslaved */
1306         if (slave_dev->flags & IFF_SLAVE) {
1307                 dprintk("Error, Device was already enslaved\n");
1308                 return -EBUSY;
1309         }
1310
1311         /* vlan challenged mutual exclusion */
1312         /* no need to lock since we're protected by rtnl_lock */
1313         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1314                 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1315                 if (!list_empty(&bond->vlan_list)) {
1316                         printk(KERN_ERR DRV_NAME
1317                                ": %s: Error: cannot enslave VLAN "
1318                                "challenged slave %s on VLAN enabled "
1319                                "bond %s\n", bond_dev->name, slave_dev->name,
1320                                bond_dev->name);
1321                         return -EPERM;
1322                 } else {
1323                         printk(KERN_WARNING DRV_NAME
1324                                ": %s: Warning: enslaved VLAN challenged "
1325                                "slave %s. Adding VLANs will be blocked as "
1326                                "long as %s is part of bond %s\n",
1327                                bond_dev->name, slave_dev->name, slave_dev->name,
1328                                bond_dev->name);
1329                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1330                 }
1331         } else {
1332                 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1333                 if (bond->slave_cnt == 0) {
1334                         /* First slave, and it is not VLAN challenged,
1335                          * so remove the block of adding VLANs over the bond.
1336                          */
1337                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1338                 }
1339         }
1340
1341         /*
1342          * Old ifenslave binaries are no longer supported.  These can
1343          * be identified with moderate accurary by the state of the slave:
1344          * the current ifenslave will set the interface down prior to
1345          * enslaving it; the old ifenslave will not.
1346          */
1347         if ((slave_dev->flags & IFF_UP)) {
1348                 printk(KERN_ERR DRV_NAME ": %s is up. "
1349                        "This may be due to an out of date ifenslave.\n",
1350                        slave_dev->name);
1351                 res = -EPERM;
1352                 goto err_undo_flags;
1353         }
1354
1355         /* set bonding device ether type by slave - bonding netdevices are
1356          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1357          * there is a need to override some of the type dependent attribs/funcs.
1358          *
1359          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1360          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1361          */
1362         if (bond->slave_cnt == 0) {
1363                 if (slave_dev->type != ARPHRD_ETHER)
1364                         bond_setup_by_slave(bond_dev, slave_dev);
1365         } else if (bond_dev->type != slave_dev->type) {
1366                 printk(KERN_ERR DRV_NAME ": %s ether type (%d) is different "
1367                         "from other slaves (%d), can not enslave it.\n",
1368                         slave_dev->name,
1369                         slave_dev->type, bond_dev->type);
1370                         res = -EINVAL;
1371                         goto err_undo_flags;
1372         }
1373
1374         if (slave_dev->set_mac_address == NULL) {
1375                 if (bond->slave_cnt == 0) {
1376                         printk(KERN_WARNING DRV_NAME
1377                                ": %s: Warning: The first slave device "
1378                                "specified does not support setting the MAC "
1379                                "address. Enabling the fail_over_mac option.",
1380                                bond_dev->name);
1381                         bond->params.fail_over_mac = 1;
1382                 } else if (!bond->params.fail_over_mac) {
1383                         printk(KERN_ERR DRV_NAME
1384                                 ": %s: Error: The slave device specified "
1385                                 "does not support setting the MAC address, "
1386                                 "but fail_over_mac is not enabled.\n"
1387                                 , bond_dev->name);
1388                         res = -EOPNOTSUPP;
1389                         goto err_undo_flags;
1390                 }
1391         }
1392
1393         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1394         if (!new_slave) {
1395                 res = -ENOMEM;
1396                 goto err_undo_flags;
1397         }
1398
1399         /* save slave's original flags before calling
1400          * netdev_set_master and dev_open
1401          */
1402         new_slave->original_flags = slave_dev->flags;
1403
1404         /*
1405          * Save slave's original ("permanent") mac address for modes
1406          * that need it, and for restoring it upon release, and then
1407          * set it to the master's address
1408          */
1409         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1410
1411         if (!bond->params.fail_over_mac) {
1412                 /*
1413                  * Set slave to master's mac address.  The application already
1414                  * set the master's mac address to that of the first slave
1415                  */
1416                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1417                 addr.sa_family = slave_dev->type;
1418                 res = dev_set_mac_address(slave_dev, &addr);
1419                 if (res) {
1420                         dprintk("Error %d calling set_mac_address\n", res);
1421                         goto err_free;
1422                 }
1423         }
1424
1425         res = netdev_set_master(slave_dev, bond_dev);
1426         if (res) {
1427                 dprintk("Error %d calling netdev_set_master\n", res);
1428                 goto err_close;
1429         }
1430         /* open the slave since the application closed it */
1431         res = dev_open(slave_dev);
1432         if (res) {
1433                 dprintk("Openning slave %s failed\n", slave_dev->name);
1434                 goto err_restore_mac;
1435         }
1436
1437         new_slave->dev = slave_dev;
1438         slave_dev->priv_flags |= IFF_BONDING;
1439
1440         if ((bond->params.mode == BOND_MODE_TLB) ||
1441             (bond->params.mode == BOND_MODE_ALB)) {
1442                 /* bond_alb_init_slave() must be called before all other stages since
1443                  * it might fail and we do not want to have to undo everything
1444                  */
1445                 res = bond_alb_init_slave(bond, new_slave);
1446                 if (res) {
1447                         goto err_unset_master;
1448                 }
1449         }
1450
1451         /* If the mode USES_PRIMARY, then the new slave gets the
1452          * master's promisc (and mc) settings only if it becomes the
1453          * curr_active_slave, and that is taken care of later when calling
1454          * bond_change_active()
1455          */
1456         if (!USES_PRIMARY(bond->params.mode)) {
1457                 /* set promiscuity level to new slave */
1458                 if (bond_dev->flags & IFF_PROMISC) {
1459                         dev_set_promiscuity(slave_dev, 1);
1460                 }
1461
1462                 /* set allmulti level to new slave */
1463                 if (bond_dev->flags & IFF_ALLMULTI) {
1464                         dev_set_allmulti(slave_dev, 1);
1465                 }
1466
1467                 netif_tx_lock_bh(bond_dev);
1468                 /* upload master's mc_list to new slave */
1469                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1470                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1471                 }
1472                 netif_tx_unlock_bh(bond_dev);
1473         }
1474
1475         if (bond->params.mode == BOND_MODE_8023AD) {
1476                 /* add lacpdu mc addr to mc list */
1477                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1478
1479                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1480         }
1481
1482         bond_add_vlans_on_slave(bond, slave_dev);
1483
1484         write_lock_bh(&bond->lock);
1485
1486         bond_attach_slave(bond, new_slave);
1487
1488         new_slave->delay = 0;
1489         new_slave->link_failure_count = 0;
1490
1491         bond_compute_features(bond);
1492
1493         new_slave->last_arp_rx = jiffies;
1494
1495         if (bond->params.miimon && !bond->params.use_carrier) {
1496                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1497
1498                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1499                         /*
1500                          * miimon is set but a bonded network driver
1501                          * does not support ETHTOOL/MII and
1502                          * arp_interval is not set.  Note: if
1503                          * use_carrier is enabled, we will never go
1504                          * here (because netif_carrier is always
1505                          * supported); thus, we don't need to change
1506                          * the messages for netif_carrier.
1507                          */
1508                         printk(KERN_WARNING DRV_NAME
1509                                ": %s: Warning: MII and ETHTOOL support not "
1510                                "available for interface %s, and "
1511                                "arp_interval/arp_ip_target module parameters "
1512                                "not specified, thus bonding will not detect "
1513                                "link failures! see bonding.txt for details.\n",
1514                                bond_dev->name, slave_dev->name);
1515                 } else if (link_reporting == -1) {
1516                         /* unable get link status using mii/ethtool */
1517                         printk(KERN_WARNING DRV_NAME
1518                                ": %s: Warning: can't get link status from "
1519                                "interface %s; the network driver associated "
1520                                "with this interface does not support MII or "
1521                                "ETHTOOL link status reporting, thus miimon "
1522                                "has no effect on this interface.\n",
1523                                bond_dev->name, slave_dev->name);
1524                 }
1525         }
1526
1527         /* check for initial state */
1528         if (!bond->params.miimon ||
1529             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1530                 if (bond->params.updelay) {
1531                         dprintk("Initial state of slave_dev is "
1532                                 "BOND_LINK_BACK\n");
1533                         new_slave->link  = BOND_LINK_BACK;
1534                         new_slave->delay = bond->params.updelay;
1535                 } else {
1536                         dprintk("Initial state of slave_dev is "
1537                                 "BOND_LINK_UP\n");
1538                         new_slave->link  = BOND_LINK_UP;
1539                 }
1540                 new_slave->jiffies = jiffies;
1541         } else {
1542                 dprintk("Initial state of slave_dev is "
1543                         "BOND_LINK_DOWN\n");
1544                 new_slave->link  = BOND_LINK_DOWN;
1545         }
1546
1547         if (bond_update_speed_duplex(new_slave) &&
1548             (new_slave->link != BOND_LINK_DOWN)) {
1549                 printk(KERN_WARNING DRV_NAME
1550                        ": %s: Warning: failed to get speed and duplex from %s, "
1551                        "assumed to be 100Mb/sec and Full.\n",
1552                        bond_dev->name, new_slave->dev->name);
1553
1554                 if (bond->params.mode == BOND_MODE_8023AD) {
1555                         printk(KERN_WARNING DRV_NAME
1556                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1557                                "support in base driver for proper aggregator "
1558                                "selection.\n", bond_dev->name);
1559                 }
1560         }
1561
1562         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1563                 /* if there is a primary slave, remember it */
1564                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1565                         bond->primary_slave = new_slave;
1566                 }
1567         }
1568
1569         switch (bond->params.mode) {
1570         case BOND_MODE_ACTIVEBACKUP:
1571                 bond_set_slave_inactive_flags(new_slave);
1572                 bond_select_active_slave(bond);
1573                 break;
1574         case BOND_MODE_8023AD:
1575                 /* in 802.3ad mode, the internal mechanism
1576                  * will activate the slaves in the selected
1577                  * aggregator
1578                  */
1579                 bond_set_slave_inactive_flags(new_slave);
1580                 /* if this is the first slave */
1581                 if (bond->slave_cnt == 1) {
1582                         SLAVE_AD_INFO(new_slave).id = 1;
1583                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1584                          * can be called only after the mac address of the bond is set
1585                          */
1586                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1587                                             bond->params.lacp_fast);
1588                 } else {
1589                         SLAVE_AD_INFO(new_slave).id =
1590                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1591                 }
1592
1593                 bond_3ad_bind_slave(new_slave);
1594                 break;
1595         case BOND_MODE_TLB:
1596         case BOND_MODE_ALB:
1597                 new_slave->state = BOND_STATE_ACTIVE;
1598                 bond_set_slave_inactive_flags(new_slave);
1599                 break;
1600         default:
1601                 dprintk("This slave is always active in trunk mode\n");
1602
1603                 /* always active in trunk mode */
1604                 new_slave->state = BOND_STATE_ACTIVE;
1605
1606                 /* In trunking mode there is little meaning to curr_active_slave
1607                  * anyway (it holds no special properties of the bond device),
1608                  * so we can change it without calling change_active_interface()
1609                  */
1610                 if (!bond->curr_active_slave) {
1611                         bond->curr_active_slave = new_slave;
1612                 }
1613                 break;
1614         } /* switch(bond_mode) */
1615
1616         bond_set_carrier(bond);
1617
1618         write_unlock_bh(&bond->lock);
1619
1620         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1621         if (res)
1622                 goto err_unset_master;
1623
1624         printk(KERN_INFO DRV_NAME
1625                ": %s: enslaving %s as a%s interface with a%s link.\n",
1626                bond_dev->name, slave_dev->name,
1627                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1628                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1629
1630         /* enslave is successful */
1631         return 0;
1632
1633 /* Undo stages on error */
1634 err_unset_master:
1635         netdev_set_master(slave_dev, NULL);
1636
1637 err_close:
1638         dev_close(slave_dev);
1639
1640 err_restore_mac:
1641         if (!bond->params.fail_over_mac) {
1642                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1643                 addr.sa_family = slave_dev->type;
1644                 dev_set_mac_address(slave_dev, &addr);
1645         }
1646
1647 err_free:
1648         kfree(new_slave);
1649
1650 err_undo_flags:
1651         bond_dev->features = old_features;
1652
1653         return res;
1654 }
1655
1656 /*
1657  * Try to release the slave device <slave> from the bond device <master>
1658  * It is legal to access curr_active_slave without a lock because all the function
1659  * is write-locked.
1660  *
1661  * The rules for slave state should be:
1662  *   for Active/Backup:
1663  *     Active stays on all backups go down
1664  *   for Bonded connections:
1665  *     The first up interface should be left on and all others downed.
1666  */
1667 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1668 {
1669         struct bonding *bond = bond_dev->priv;
1670         struct slave *slave, *oldcurrent;
1671         struct sockaddr addr;
1672         int mac_addr_differ;
1673         DECLARE_MAC_BUF(mac);
1674
1675         /* slave is not a slave or master is not master of this slave */
1676         if (!(slave_dev->flags & IFF_SLAVE) ||
1677             (slave_dev->master != bond_dev)) {
1678                 printk(KERN_ERR DRV_NAME
1679                        ": %s: Error: cannot release %s.\n",
1680                        bond_dev->name, slave_dev->name);
1681                 return -EINVAL;
1682         }
1683
1684         write_lock_bh(&bond->lock);
1685
1686         slave = bond_get_slave_by_dev(bond, slave_dev);
1687         if (!slave) {
1688                 /* not a slave of this bond */
1689                 printk(KERN_INFO DRV_NAME
1690                        ": %s: %s not enslaved\n",
1691                        bond_dev->name, slave_dev->name);
1692                 write_unlock_bh(&bond->lock);
1693                 return -EINVAL;
1694         }
1695
1696         mac_addr_differ = memcmp(bond_dev->dev_addr,
1697                                  slave->perm_hwaddr,
1698                                  ETH_ALEN);
1699         if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1700                 printk(KERN_WARNING DRV_NAME
1701                        ": %s: Warning: the permanent HWaddr of %s - "
1702                        "%s - is still in use by %s. "
1703                        "Set the HWaddr of %s to a different address "
1704                        "to avoid conflicts.\n",
1705                        bond_dev->name,
1706                        slave_dev->name,
1707                        print_mac(mac, slave->perm_hwaddr),
1708                        bond_dev->name,
1709                        slave_dev->name);
1710         }
1711
1712         /* Inform AD package of unbinding of slave. */
1713         if (bond->params.mode == BOND_MODE_8023AD) {
1714                 /* must be called before the slave is
1715                  * detached from the list
1716                  */
1717                 bond_3ad_unbind_slave(slave);
1718         }
1719
1720         printk(KERN_INFO DRV_NAME
1721                ": %s: releasing %s interface %s\n",
1722                bond_dev->name,
1723                (slave->state == BOND_STATE_ACTIVE)
1724                ? "active" : "backup",
1725                slave_dev->name);
1726
1727         oldcurrent = bond->curr_active_slave;
1728
1729         bond->current_arp_slave = NULL;
1730
1731         /* release the slave from its bond */
1732         bond_detach_slave(bond, slave);
1733
1734         bond_compute_features(bond);
1735
1736         if (bond->primary_slave == slave) {
1737                 bond->primary_slave = NULL;
1738         }
1739
1740         if (oldcurrent == slave) {
1741                 bond_change_active_slave(bond, NULL);
1742         }
1743
1744         if ((bond->params.mode == BOND_MODE_TLB) ||
1745             (bond->params.mode == BOND_MODE_ALB)) {
1746                 /* Must be called only after the slave has been
1747                  * detached from the list and the curr_active_slave
1748                  * has been cleared (if our_slave == old_current),
1749                  * but before a new active slave is selected.
1750                  */
1751                 write_unlock_bh(&bond->lock);
1752                 bond_alb_deinit_slave(bond, slave);
1753                 write_lock_bh(&bond->lock);
1754         }
1755
1756         if (oldcurrent == slave) {
1757                 /*
1758                  * Note that we hold RTNL over this sequence, so there
1759                  * is no concern that another slave add/remove event
1760                  * will interfere.
1761                  */
1762                 write_unlock_bh(&bond->lock);
1763                 read_lock(&bond->lock);
1764                 write_lock_bh(&bond->curr_slave_lock);
1765
1766                 bond_select_active_slave(bond);
1767
1768                 write_unlock_bh(&bond->curr_slave_lock);
1769                 read_unlock(&bond->lock);
1770                 write_lock_bh(&bond->lock);
1771         }
1772
1773         if (bond->slave_cnt == 0) {
1774                 bond_set_carrier(bond);
1775
1776                 /* if the last slave was removed, zero the mac address
1777                  * of the master so it will be set by the application
1778                  * to the mac address of the first slave
1779                  */
1780                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1781
1782                 if (list_empty(&bond->vlan_list)) {
1783                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1784                 } else {
1785                         printk(KERN_WARNING DRV_NAME
1786                                ": %s: Warning: clearing HW address of %s while it "
1787                                "still has VLANs.\n",
1788                                bond_dev->name, bond_dev->name);
1789                         printk(KERN_WARNING DRV_NAME
1790                                ": %s: When re-adding slaves, make sure the bond's "
1791                                "HW address matches its VLANs'.\n",
1792                                bond_dev->name);
1793                 }
1794         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1795                    !bond_has_challenged_slaves(bond)) {
1796                 printk(KERN_INFO DRV_NAME
1797                        ": %s: last VLAN challenged slave %s "
1798                        "left bond %s. VLAN blocking is removed\n",
1799                        bond_dev->name, slave_dev->name, bond_dev->name);
1800                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1801         }
1802
1803         write_unlock_bh(&bond->lock);
1804
1805         /* must do this from outside any spinlocks */
1806         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1807
1808         bond_del_vlans_from_slave(bond, slave_dev);
1809
1810         /* If the mode USES_PRIMARY, then we should only remove its
1811          * promisc and mc settings if it was the curr_active_slave, but that was
1812          * already taken care of above when we detached the slave
1813          */
1814         if (!USES_PRIMARY(bond->params.mode)) {
1815                 /* unset promiscuity level from slave */
1816                 if (bond_dev->flags & IFF_PROMISC) {
1817                         dev_set_promiscuity(slave_dev, -1);
1818                 }
1819
1820                 /* unset allmulti level from slave */
1821                 if (bond_dev->flags & IFF_ALLMULTI) {
1822                         dev_set_allmulti(slave_dev, -1);
1823                 }
1824
1825                 /* flush master's mc_list from slave */
1826                 netif_tx_lock_bh(bond_dev);
1827                 bond_mc_list_flush(bond_dev, slave_dev);
1828                 netif_tx_unlock_bh(bond_dev);
1829         }
1830
1831         netdev_set_master(slave_dev, NULL);
1832
1833         /* close slave before restoring its mac address */
1834         dev_close(slave_dev);
1835
1836         if (!bond->params.fail_over_mac) {
1837                 /* restore original ("permanent") mac address */
1838                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1839                 addr.sa_family = slave_dev->type;
1840                 dev_set_mac_address(slave_dev, &addr);
1841         }
1842
1843         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1844                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1845                                    IFF_SLAVE_NEEDARP);
1846
1847         kfree(slave);
1848
1849         return 0;  /* deletion OK */
1850 }
1851
1852 /*
1853 * Destroy a bonding device.
1854 * Must be under rtnl_lock when this function is called.
1855 */
1856 void bond_destroy(struct bonding *bond)
1857 {
1858         bond_deinit(bond->dev);
1859         bond_destroy_sysfs_entry(bond);
1860         unregister_netdevice(bond->dev);
1861 }
1862
1863 /*
1864 * First release a slave and than destroy the bond if no more slaves iare left.
1865 * Must be under rtnl_lock when this function is called.
1866 */
1867 int  bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev)
1868 {
1869         struct bonding *bond = bond_dev->priv;
1870         int ret;
1871
1872         ret = bond_release(bond_dev, slave_dev);
1873         if ((ret == 0) && (bond->slave_cnt == 0)) {
1874                 printk(KERN_INFO DRV_NAME ": %s: destroying bond %s.\n",
1875                        bond_dev->name, bond_dev->name);
1876                 bond_destroy(bond);
1877         }
1878         return ret;
1879 }
1880
1881 /*
1882  * This function releases all slaves.
1883  */
1884 static int bond_release_all(struct net_device *bond_dev)
1885 {
1886         struct bonding *bond = bond_dev->priv;
1887         struct slave *slave;
1888         struct net_device *slave_dev;
1889         struct sockaddr addr;
1890
1891         write_lock_bh(&bond->lock);
1892
1893         netif_carrier_off(bond_dev);
1894
1895         if (bond->slave_cnt == 0) {
1896                 goto out;
1897         }
1898
1899         bond->current_arp_slave = NULL;
1900         bond->primary_slave = NULL;
1901         bond_change_active_slave(bond, NULL);
1902
1903         while ((slave = bond->first_slave) != NULL) {
1904                 /* Inform AD package of unbinding of slave
1905                  * before slave is detached from the list.
1906                  */
1907                 if (bond->params.mode == BOND_MODE_8023AD) {
1908                         bond_3ad_unbind_slave(slave);
1909                 }
1910
1911                 slave_dev = slave->dev;
1912                 bond_detach_slave(bond, slave);
1913
1914                 /* now that the slave is detached, unlock and perform
1915                  * all the undo steps that should not be called from
1916                  * within a lock.
1917                  */
1918                 write_unlock_bh(&bond->lock);
1919
1920                 if ((bond->params.mode == BOND_MODE_TLB) ||
1921                     (bond->params.mode == BOND_MODE_ALB)) {
1922                         /* must be called only after the slave
1923                          * has been detached from the list
1924                          */
1925                         bond_alb_deinit_slave(bond, slave);
1926                 }
1927
1928                 bond_compute_features(bond);
1929
1930                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1931                 bond_del_vlans_from_slave(bond, slave_dev);
1932
1933                 /* If the mode USES_PRIMARY, then we should only remove its
1934                  * promisc and mc settings if it was the curr_active_slave, but that was
1935                  * already taken care of above when we detached the slave
1936                  */
1937                 if (!USES_PRIMARY(bond->params.mode)) {
1938                         /* unset promiscuity level from slave */
1939                         if (bond_dev->flags & IFF_PROMISC) {
1940                                 dev_set_promiscuity(slave_dev, -1);
1941                         }
1942
1943                         /* unset allmulti level from slave */
1944                         if (bond_dev->flags & IFF_ALLMULTI) {
1945                                 dev_set_allmulti(slave_dev, -1);
1946                         }
1947
1948                         /* flush master's mc_list from slave */
1949                         netif_tx_lock_bh(bond_dev);
1950                         bond_mc_list_flush(bond_dev, slave_dev);
1951                         netif_tx_unlock_bh(bond_dev);
1952                 }
1953
1954                 netdev_set_master(slave_dev, NULL);
1955
1956                 /* close slave before restoring its mac address */
1957                 dev_close(slave_dev);
1958
1959                 if (!bond->params.fail_over_mac) {
1960                         /* restore original ("permanent") mac address*/
1961                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1962                         addr.sa_family = slave_dev->type;
1963                         dev_set_mac_address(slave_dev, &addr);
1964                 }
1965
1966                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1967                                            IFF_SLAVE_INACTIVE);
1968
1969                 kfree(slave);
1970
1971                 /* re-acquire the lock before getting the next slave */
1972                 write_lock_bh(&bond->lock);
1973         }
1974
1975         /* zero the mac address of the master so it will be
1976          * set by the application to the mac address of the
1977          * first slave
1978          */
1979         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1980
1981         if (list_empty(&bond->vlan_list)) {
1982                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1983         } else {
1984                 printk(KERN_WARNING DRV_NAME
1985                        ": %s: Warning: clearing HW address of %s while it "
1986                        "still has VLANs.\n",
1987                        bond_dev->name, bond_dev->name);
1988                 printk(KERN_WARNING DRV_NAME
1989                        ": %s: When re-adding slaves, make sure the bond's "
1990                        "HW address matches its VLANs'.\n",
1991                        bond_dev->name);
1992         }
1993
1994         printk(KERN_INFO DRV_NAME
1995                ": %s: released all slaves\n",
1996                bond_dev->name);
1997
1998 out:
1999         write_unlock_bh(&bond->lock);
2000
2001         return 0;
2002 }
2003
2004 /*
2005  * This function changes the active slave to slave <slave_dev>.
2006  * It returns -EINVAL in the following cases.
2007  *  - <slave_dev> is not found in the list.
2008  *  - There is not active slave now.
2009  *  - <slave_dev> is already active.
2010  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2011  *  - <slave_dev> is not running.
2012  * In these cases, this fuction does nothing.
2013  * In the other cases, currnt_slave pointer is changed and 0 is returned.
2014  */
2015 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2016 {
2017         struct bonding *bond = bond_dev->priv;
2018         struct slave *old_active = NULL;
2019         struct slave *new_active = NULL;
2020         int res = 0;
2021
2022         if (!USES_PRIMARY(bond->params.mode)) {
2023                 return -EINVAL;
2024         }
2025
2026         /* Verify that master_dev is indeed the master of slave_dev */
2027         if (!(slave_dev->flags & IFF_SLAVE) ||
2028             (slave_dev->master != bond_dev)) {
2029                 return -EINVAL;
2030         }
2031
2032         read_lock(&bond->lock);
2033
2034         read_lock(&bond->curr_slave_lock);
2035         old_active = bond->curr_active_slave;
2036         read_unlock(&bond->curr_slave_lock);
2037
2038         new_active = bond_get_slave_by_dev(bond, slave_dev);
2039
2040         /*
2041          * Changing to the current active: do nothing; return success.
2042          */
2043         if (new_active && (new_active == old_active)) {
2044                 read_unlock(&bond->lock);
2045                 return 0;
2046         }
2047
2048         if ((new_active) &&
2049             (old_active) &&
2050             (new_active->link == BOND_LINK_UP) &&
2051             IS_UP(new_active->dev)) {
2052                 write_lock_bh(&bond->curr_slave_lock);
2053                 bond_change_active_slave(bond, new_active);
2054                 write_unlock_bh(&bond->curr_slave_lock);
2055         } else {
2056                 res = -EINVAL;
2057         }
2058
2059         read_unlock(&bond->lock);
2060
2061         return res;
2062 }
2063
2064 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2065 {
2066         struct bonding *bond = bond_dev->priv;
2067
2068         info->bond_mode = bond->params.mode;
2069         info->miimon = bond->params.miimon;
2070
2071         read_lock(&bond->lock);
2072         info->num_slaves = bond->slave_cnt;
2073         read_unlock(&bond->lock);
2074
2075         return 0;
2076 }
2077
2078 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2079 {
2080         struct bonding *bond = bond_dev->priv;
2081         struct slave *slave;
2082         int i, found = 0;
2083
2084         if (info->slave_id < 0) {
2085                 return -ENODEV;
2086         }
2087
2088         read_lock(&bond->lock);
2089
2090         bond_for_each_slave(bond, slave, i) {
2091                 if (i == (int)info->slave_id) {
2092                         found = 1;
2093                         break;
2094                 }
2095         }
2096
2097         read_unlock(&bond->lock);
2098
2099         if (found) {
2100                 strcpy(info->slave_name, slave->dev->name);
2101                 info->link = slave->link;
2102                 info->state = slave->state;
2103                 info->link_failure_count = slave->link_failure_count;
2104         } else {
2105                 return -ENODEV;
2106         }
2107
2108         return 0;
2109 }
2110
2111 /*-------------------------------- Monitoring -------------------------------*/
2112
2113 /*
2114  * if !have_locks, return nonzero if a failover is necessary.  if
2115  * have_locks, do whatever failover activities are needed.
2116  *
2117  * This is to separate the inspection and failover steps for locking
2118  * purposes; failover requires rtnl, but acquiring it for every
2119  * inspection is undesirable, so a wrapper first does inspection, and
2120  * the acquires the necessary locks and calls again to perform
2121  * failover if needed.  Since all locks are dropped, a complete
2122  * restart is needed between calls.
2123  */
2124 static int __bond_mii_monitor(struct bonding *bond, int have_locks)
2125 {
2126         struct slave *slave, *oldcurrent;
2127         int do_failover = 0;
2128         int i;
2129
2130         if (bond->slave_cnt == 0)
2131                 goto out;
2132
2133         /* we will try to read the link status of each of our slaves, and
2134          * set their IFF_RUNNING flag appropriately. For each slave not
2135          * supporting MII status, we won't do anything so that a user-space
2136          * program could monitor the link itself if needed.
2137          */
2138
2139         if (bond->send_grat_arp) {
2140                 if (bond->curr_active_slave && test_bit(__LINK_STATE_LINKWATCH_PENDING,
2141                                 &bond->curr_active_slave->dev->state))
2142                         dprintk("Needs to send gratuitous arp but not yet\n");
2143                 else {
2144                         dprintk("sending delayed gratuitous arp on on %s\n",
2145                                 bond->curr_active_slave->dev->name);
2146                         bond_send_gratuitous_arp(bond);
2147                         bond->send_grat_arp = 0;
2148                 }
2149         }
2150         read_lock(&bond->curr_slave_lock);
2151         oldcurrent = bond->curr_active_slave;
2152         read_unlock(&bond->curr_slave_lock);
2153
2154         bond_for_each_slave(bond, slave, i) {
2155                 struct net_device *slave_dev = slave->dev;
2156                 int link_state;
2157                 u16 old_speed = slave->speed;
2158                 u8 old_duplex = slave->duplex;
2159
2160                 link_state = bond_check_dev_link(bond, slave_dev, 0);
2161
2162                 switch (slave->link) {
2163                 case BOND_LINK_UP:      /* the link was up */
2164                         if (link_state == BMSR_LSTATUS) {
2165                                 if (!oldcurrent) {
2166                                         if (!have_locks)
2167                                                 return 1;
2168                                         do_failover = 1;
2169                                 }
2170                                 break;
2171                         } else { /* link going down */
2172                                 slave->link  = BOND_LINK_FAIL;
2173                                 slave->delay = bond->params.downdelay;
2174
2175                                 if (slave->link_failure_count < UINT_MAX) {
2176                                         slave->link_failure_count++;
2177                                 }
2178
2179                                 if (bond->params.downdelay) {
2180                                         printk(KERN_INFO DRV_NAME
2181                                                ": %s: link status down for %s "
2182                                                "interface %s, disabling it in "
2183                                                "%d ms.\n",
2184                                                bond->dev->name,
2185                                                IS_UP(slave_dev)
2186                                                ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2187                                                   ? ((slave == oldcurrent)
2188                                                      ? "active " : "backup ")
2189                                                   : "")
2190                                                : "idle ",
2191                                                slave_dev->name,
2192                                                bond->params.downdelay * bond->params.miimon);
2193                                 }
2194                         }
2195                         /* no break ! fall through the BOND_LINK_FAIL test to
2196                            ensure proper action to be taken
2197                         */
2198                 case BOND_LINK_FAIL:    /* the link has just gone down */
2199                         if (link_state != BMSR_LSTATUS) {
2200                                 /* link stays down */
2201                                 if (slave->delay <= 0) {
2202                                         if (!have_locks)
2203                                                 return 1;
2204
2205                                         /* link down for too long time */
2206                                         slave->link = BOND_LINK_DOWN;
2207
2208                                         /* in active/backup mode, we must
2209                                          * completely disable this interface
2210                                          */
2211                                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2212                                             (bond->params.mode == BOND_MODE_8023AD)) {
2213                                                 bond_set_slave_inactive_flags(slave);
2214                                         }
2215
2216                                         printk(KERN_INFO DRV_NAME
2217                                                ": %s: link status definitely "
2218                                                "down for interface %s, "
2219                                                "disabling it\n",
2220                                                bond->dev->name,
2221                                                slave_dev->name);
2222
2223                                         /* notify ad that the link status has changed */
2224                                         if (bond->params.mode == BOND_MODE_8023AD) {
2225                                                 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2226                                         }
2227
2228                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2229                                             (bond->params.mode == BOND_MODE_ALB)) {
2230                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2231                                         }
2232
2233                                         if (slave == oldcurrent) {
2234                                                 do_failover = 1;
2235                                         }
2236                                 } else {
2237                                         slave->delay--;
2238                                 }
2239                         } else {
2240                                 /* link up again */
2241                                 slave->link  = BOND_LINK_UP;
2242                                 slave->jiffies = jiffies;
2243                                 printk(KERN_INFO DRV_NAME
2244                                        ": %s: link status up again after %d "
2245                                        "ms for interface %s.\n",
2246                                        bond->dev->name,
2247                                        (bond->params.downdelay - slave->delay) * bond->params.miimon,
2248                                        slave_dev->name);
2249                         }
2250                         break;
2251                 case BOND_LINK_DOWN:    /* the link was down */
2252                         if (link_state != BMSR_LSTATUS) {
2253                                 /* the link stays down, nothing more to do */
2254                                 break;
2255                         } else {        /* link going up */
2256                                 slave->link  = BOND_LINK_BACK;
2257                                 slave->delay = bond->params.updelay;
2258
2259                                 if (bond->params.updelay) {
2260                                         /* if updelay == 0, no need to
2261                                            advertise about a 0 ms delay */
2262                                         printk(KERN_INFO DRV_NAME
2263                                                ": %s: link status up for "
2264                                                "interface %s, enabling it "
2265                                                "in %d ms.\n",
2266                                                bond->dev->name,
2267                                                slave_dev->name,
2268                                                bond->params.updelay * bond->params.miimon);
2269                                 }
2270                         }
2271                         /* no break ! fall through the BOND_LINK_BACK state in
2272                            case there's something to do.
2273                         */
2274                 case BOND_LINK_BACK:    /* the link has just come back */
2275                         if (link_state != BMSR_LSTATUS) {
2276                                 /* link down again */
2277                                 slave->link  = BOND_LINK_DOWN;
2278
2279                                 printk(KERN_INFO DRV_NAME
2280                                        ": %s: link status down again after %d "
2281                                        "ms for interface %s.\n",
2282                                        bond->dev->name,
2283                                        (bond->params.updelay - slave->delay) * bond->params.miimon,
2284                                        slave_dev->name);
2285                         } else {
2286                                 /* link stays up */
2287                                 if (slave->delay == 0) {
2288                                         if (!have_locks)
2289                                                 return 1;
2290
2291                                         /* now the link has been up for long time enough */
2292                                         slave->link = BOND_LINK_UP;
2293                                         slave->jiffies = jiffies;
2294
2295                                         if (bond->params.mode == BOND_MODE_8023AD) {
2296                                                 /* prevent it from being the active one */
2297                                                 slave->state = BOND_STATE_BACKUP;
2298                                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2299                                                 /* make it immediately active */
2300                                                 slave->state = BOND_STATE_ACTIVE;
2301                                         } else if (slave != bond->primary_slave) {
2302                                                 /* prevent it from being the active one */
2303                                                 slave->state = BOND_STATE_BACKUP;
2304                                         }
2305
2306                                         printk(KERN_INFO DRV_NAME
2307                                                ": %s: link status definitely "
2308                                                "up for interface %s.\n",
2309                                                bond->dev->name,
2310                                                slave_dev->name);
2311
2312                                         /* notify ad that the link status has changed */
2313                                         if (bond->params.mode == BOND_MODE_8023AD) {
2314                                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2315                                         }
2316
2317                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2318                                             (bond->params.mode == BOND_MODE_ALB)) {
2319                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2320                                         }
2321
2322                                         if ((!oldcurrent) ||
2323                                             (slave == bond->primary_slave)) {
2324                                                 do_failover = 1;
2325                                         }
2326                                 } else {
2327                                         slave->delay--;
2328                                 }
2329                         }
2330                         break;
2331                 default:
2332                         /* Should not happen */
2333                         printk(KERN_ERR DRV_NAME
2334                                ": %s: Error: %s Illegal value (link=%d)\n",
2335                                bond->dev->name,
2336                                slave->dev->name,
2337                                slave->link);
2338                         goto out;
2339                 } /* end of switch (slave->link) */
2340
2341                 bond_update_speed_duplex(slave);
2342
2343                 if (bond->params.mode == BOND_MODE_8023AD) {
2344                         if (old_speed != slave->speed) {
2345                                 bond_3ad_adapter_speed_changed(slave);
2346                         }
2347
2348                         if (old_duplex != slave->duplex) {
2349                                 bond_3ad_adapter_duplex_changed(slave);
2350                         }
2351                 }
2352
2353         } /* end of for */
2354
2355         if (do_failover) {
2356                 ASSERT_RTNL();
2357
2358                 write_lock_bh(&bond->curr_slave_lock);
2359
2360                 bond_select_active_slave(bond);
2361
2362                 write_unlock_bh(&bond->curr_slave_lock);
2363
2364         } else
2365                 bond_set_carrier(bond);
2366
2367 out:
2368         return 0;
2369 }
2370
2371 /*
2372  * bond_mii_monitor
2373  *
2374  * Really a wrapper that splits the mii monitor into two phases: an
2375  * inspection, then (if inspection indicates something needs to be
2376  * done) an acquisition of appropriate locks followed by another pass
2377  * to implement whatever link state changes are indicated.
2378  */
2379 void bond_mii_monitor(struct work_struct *work)
2380 {
2381         struct bonding *bond = container_of(work, struct bonding,
2382                                             mii_work.work);
2383         unsigned long delay;
2384
2385         read_lock(&bond->lock);
2386         if (bond->kill_timers) {
2387                 read_unlock(&bond->lock);
2388                 return;
2389         }
2390         if (__bond_mii_monitor(bond, 0)) {
2391                 read_unlock(&bond->lock);
2392                 rtnl_lock();
2393                 read_lock(&bond->lock);
2394                 __bond_mii_monitor(bond, 1);
2395                 read_unlock(&bond->lock);
2396                 rtnl_unlock();  /* might sleep, hold no other locks */
2397                 read_lock(&bond->lock);
2398         }
2399
2400         delay = ((bond->params.miimon * HZ) / 1000) ? : 1;
2401         read_unlock(&bond->lock);
2402         queue_delayed_work(bond->wq, &bond->mii_work, delay);
2403 }
2404
2405 static __be32 bond_glean_dev_ip(struct net_device *dev)
2406 {
2407         struct in_device *idev;
2408         struct in_ifaddr *ifa;
2409         __be32 addr = 0;
2410
2411         if (!dev)
2412                 return 0;
2413
2414         rcu_read_lock();
2415         idev = __in_dev_get_rcu(dev);
2416         if (!idev)
2417                 goto out;
2418
2419         ifa = idev->ifa_list;
2420         if (!ifa)
2421                 goto out;
2422
2423         addr = ifa->ifa_local;
2424 out:
2425         rcu_read_unlock();
2426         return addr;
2427 }
2428
2429 static int bond_has_ip(struct bonding *bond)
2430 {
2431         struct vlan_entry *vlan, *vlan_next;
2432
2433         if (bond->master_ip)
2434                 return 1;
2435
2436         if (list_empty(&bond->vlan_list))
2437                 return 0;
2438
2439         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2440                                  vlan_list) {
2441                 if (vlan->vlan_ip)
2442                         return 1;
2443         }
2444
2445         return 0;
2446 }
2447
2448 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2449 {
2450         struct vlan_entry *vlan, *vlan_next;
2451
2452         if (ip == bond->master_ip)
2453                 return 1;
2454
2455         if (list_empty(&bond->vlan_list))
2456                 return 0;
2457
2458         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2459                                  vlan_list) {
2460                 if (ip == vlan->vlan_ip)
2461                         return 1;
2462         }
2463
2464         return 0;
2465 }
2466
2467 /*
2468  * We go to the (large) trouble of VLAN tagging ARP frames because
2469  * switches in VLAN mode (especially if ports are configured as
2470  * "native" to a VLAN) might not pass non-tagged frames.
2471  */
2472 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2473 {
2474         struct sk_buff *skb;
2475
2476         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2477                slave_dev->name, dest_ip, src_ip, vlan_id);
2478
2479         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2480                          NULL, slave_dev->dev_addr, NULL);
2481
2482         if (!skb) {
2483                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2484                 return;
2485         }
2486         if (vlan_id) {
2487                 skb = vlan_put_tag(skb, vlan_id);
2488                 if (!skb) {
2489                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2490                         return;
2491                 }
2492         }
2493         arp_xmit(skb);
2494 }
2495
2496
2497 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2498 {
2499         int i, vlan_id, rv;
2500         __be32 *targets = bond->params.arp_targets;
2501         struct vlan_entry *vlan, *vlan_next;
2502         struct net_device *vlan_dev;
2503         struct flowi fl;
2504         struct rtable *rt;
2505
2506         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2507                 if (!targets[i])
2508                         continue;
2509                 dprintk("basa: target %x\n", targets[i]);
2510                 if (list_empty(&bond->vlan_list)) {
2511                         dprintk("basa: empty vlan: arp_send\n");
2512                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2513                                       bond->master_ip, 0);
2514                         continue;
2515                 }
2516
2517                 /*
2518                  * If VLANs are configured, we do a route lookup to
2519                  * determine which VLAN interface would be used, so we
2520                  * can tag the ARP with the proper VLAN tag.
2521                  */
2522                 memset(&fl, 0, sizeof(fl));
2523                 fl.fl4_dst = targets[i];
2524                 fl.fl4_tos = RTO_ONLINK;
2525
2526                 rv = ip_route_output_key(&init_net, &rt, &fl);
2527                 if (rv) {
2528                         if (net_ratelimit()) {
2529                                 printk(KERN_WARNING DRV_NAME
2530                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2531                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2532                         }
2533                         continue;
2534                 }
2535
2536                 /*
2537                  * This target is not on a VLAN
2538                  */
2539                 if (rt->u.dst.dev == bond->dev) {
2540                         ip_rt_put(rt);
2541                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2542                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2543                                       bond->master_ip, 0);
2544                         continue;
2545                 }
2546
2547                 vlan_id = 0;
2548                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2549                                          vlan_list) {
2550                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2551                         if (vlan_dev == rt->u.dst.dev) {
2552                                 vlan_id = vlan->vlan_id;
2553                                 dprintk("basa: vlan match on %s %d\n",
2554                                        vlan_dev->name, vlan_id);
2555                                 break;
2556                         }
2557                 }
2558
2559                 if (vlan_id) {
2560                         ip_rt_put(rt);
2561                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2562                                       vlan->vlan_ip, vlan_id);
2563                         continue;
2564                 }
2565
2566                 if (net_ratelimit()) {
2567                         printk(KERN_WARNING DRV_NAME
2568                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2569                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2570                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2571                 }
2572                 ip_rt_put(rt);
2573         }
2574 }
2575
2576 /*
2577  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2578  * for each VLAN above us.
2579  */
2580 static void bond_send_gratuitous_arp(struct bonding *bond)
2581 {
2582         struct slave *slave = bond->curr_active_slave;
2583         struct vlan_entry *vlan;
2584         struct net_device *vlan_dev;
2585
2586         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2587                                 slave ? slave->dev->name : "NULL");
2588         if (!slave)
2589                 return;
2590
2591         if (bond->master_ip) {
2592                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2593                                 bond->master_ip, 0);
2594         }
2595
2596         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2597                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2598                 if (vlan->vlan_ip) {
2599                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2600                                       vlan->vlan_ip, vlan->vlan_id);
2601                 }
2602         }
2603 }
2604
2605 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2606 {
2607         int i;
2608         __be32 *targets = bond->params.arp_targets;
2609
2610         targets = bond->params.arp_targets;
2611         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2612                 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2613                         "%u.%u.%u.%u bhti(tip) %d\n",
2614                        NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2615                        bond_has_this_ip(bond, tip));
2616                 if (sip == targets[i]) {
2617                         if (bond_has_this_ip(bond, tip))
2618                                 slave->last_arp_rx = jiffies;
2619                         return;
2620                 }
2621         }
2622 }
2623
2624 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2625 {
2626         struct arphdr *arp;
2627         struct slave *slave;
2628         struct bonding *bond;
2629         unsigned char *arp_ptr;
2630         __be32 sip, tip;
2631
2632         if (dev->nd_net != &init_net)
2633                 goto out;
2634
2635         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2636                 goto out;
2637
2638         bond = dev->priv;
2639         read_lock(&bond->lock);
2640
2641         dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2642                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2643                 orig_dev ? orig_dev->name : "NULL");
2644
2645         slave = bond_get_slave_by_dev(bond, orig_dev);
2646         if (!slave || !slave_do_arp_validate(bond, slave))
2647                 goto out_unlock;
2648
2649         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2650                 goto out_unlock;
2651
2652         arp = arp_hdr(skb);
2653         if (arp->ar_hln != dev->addr_len ||
2654             skb->pkt_type == PACKET_OTHERHOST ||
2655             skb->pkt_type == PACKET_LOOPBACK ||
2656             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2657             arp->ar_pro != htons(ETH_P_IP) ||
2658             arp->ar_pln != 4)
2659                 goto out_unlock;
2660
2661         arp_ptr = (unsigned char *)(arp + 1);
2662         arp_ptr += dev->addr_len;
2663         memcpy(&sip, arp_ptr, 4);
2664         arp_ptr += 4 + dev->addr_len;
2665         memcpy(&tip, arp_ptr, 4);
2666
2667         dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2668                 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2669                 slave->state, bond->params.arp_validate,
2670                 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2671
2672         /*
2673          * Backup slaves won't see the ARP reply, but do come through
2674          * here for each ARP probe (so we swap the sip/tip to validate
2675          * the probe).  In a "redundant switch, common router" type of
2676          * configuration, the ARP probe will (hopefully) travel from
2677          * the active, through one switch, the router, then the other
2678          * switch before reaching the backup.
2679          */
2680         if (slave->state == BOND_STATE_ACTIVE)
2681                 bond_validate_arp(bond, slave, sip, tip);
2682         else
2683                 bond_validate_arp(bond, slave, tip, sip);
2684
2685 out_unlock:
2686         read_unlock(&bond->lock);
2687 out:
2688         dev_kfree_skb(skb);
2689         return NET_RX_SUCCESS;
2690 }
2691
2692 /*
2693  * this function is called regularly to monitor each slave's link
2694  * ensuring that traffic is being sent and received when arp monitoring
2695  * is used in load-balancing mode. if the adapter has been dormant, then an
2696  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2697  * arp monitoring in active backup mode.
2698  */
2699 void bond_loadbalance_arp_mon(struct work_struct *work)
2700 {
2701         struct bonding *bond = container_of(work, struct bonding,
2702                                             arp_work.work);
2703         struct slave *slave, *oldcurrent;
2704         int do_failover = 0;
2705         int delta_in_ticks;
2706         int i;
2707
2708         read_lock(&bond->lock);
2709
2710         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2711
2712         if (bond->kill_timers) {
2713                 goto out;
2714         }
2715
2716         if (bond->slave_cnt == 0) {
2717                 goto re_arm;
2718         }
2719
2720         read_lock(&bond->curr_slave_lock);
2721         oldcurrent = bond->curr_active_slave;
2722         read_unlock(&bond->curr_slave_lock);
2723
2724         /* see if any of the previous devices are up now (i.e. they have
2725          * xmt and rcv traffic). the curr_active_slave does not come into
2726          * the picture unless it is null. also, slave->jiffies is not needed
2727          * here because we send an arp on each slave and give a slave as
2728          * long as it needs to get the tx/rx within the delta.
2729          * TODO: what about up/down delay in arp mode? it wasn't here before
2730          *       so it can wait
2731          */
2732         bond_for_each_slave(bond, slave, i) {
2733                 if (slave->link != BOND_LINK_UP) {
2734                         if (time_before_eq(jiffies, slave->dev->trans_start + delta_in_ticks) &&
2735                             time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
2736
2737                                 slave->link  = BOND_LINK_UP;
2738                                 slave->state = BOND_STATE_ACTIVE;
2739
2740                                 /* primary_slave has no meaning in round-robin
2741                                  * mode. the window of a slave being up and
2742                                  * curr_active_slave being null after enslaving
2743                                  * is closed.
2744                                  */
2745                                 if (!oldcurrent) {
2746                                         printk(KERN_INFO DRV_NAME
2747                                                ": %s: link status definitely "
2748                                                "up for interface %s, ",
2749                                                bond->dev->name,
2750                                                slave->dev->name);
2751                                         do_failover = 1;
2752                                 } else {
2753                                         printk(KERN_INFO DRV_NAME
2754                                                ": %s: interface %s is now up\n",
2755                                                bond->dev->name,
2756                                                slave->dev->name);
2757                                 }
2758                         }
2759                 } else {
2760                         /* slave->link == BOND_LINK_UP */
2761
2762                         /* not all switches will respond to an arp request
2763                          * when the source ip is 0, so don't take the link down
2764                          * if we don't know our ip yet
2765                          */
2766                         if (time_after_eq(jiffies, slave->dev->trans_start + 2*delta_in_ticks) ||
2767                             (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks) &&
2768                              bond_has_ip(bond))) {
2769
2770                                 slave->link  = BOND_LINK_DOWN;
2771                                 slave->state = BOND_STATE_BACKUP;
2772
2773                                 if (slave->link_failure_count < UINT_MAX) {
2774                                         slave->link_failure_count++;
2775                                 }
2776
2777                                 printk(KERN_INFO DRV_NAME
2778                                        ": %s: interface %s is now down.\n",
2779                                        bond->dev->name,
2780                                        slave->dev->name);
2781
2782                                 if (slave == oldcurrent) {
2783                                         do_failover = 1;
2784                                 }
2785                         }
2786                 }
2787
2788                 /* note: if switch is in round-robin mode, all links
2789                  * must tx arp to ensure all links rx an arp - otherwise
2790                  * links may oscillate or not come up at all; if switch is
2791                  * in something like xor mode, there is nothing we can
2792                  * do - all replies will be rx'ed on same link causing slaves
2793                  * to be unstable during low/no traffic periods
2794                  */
2795                 if (IS_UP(slave->dev)) {
2796                         bond_arp_send_all(bond, slave);
2797                 }
2798         }
2799
2800         if (do_failover) {
2801                 write_lock_bh(&bond->curr_slave_lock);
2802
2803                 bond_select_active_slave(bond);
2804
2805                 write_unlock_bh(&bond->curr_slave_lock);
2806         }
2807
2808 re_arm:
2809         if (bond->params.arp_interval)
2810                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2811 out:
2812         read_unlock(&bond->lock);
2813 }
2814
2815 /*
2816  * When using arp monitoring in active-backup mode, this function is
2817  * called to determine if any backup slaves have went down or a new
2818  * current slave needs to be found.
2819  * The backup slaves never generate traffic, they are considered up by merely
2820  * receiving traffic. If the current slave goes down, each backup slave will
2821  * be given the opportunity to tx/rx an arp before being taken down - this
2822  * prevents all slaves from being taken down due to the current slave not
2823  * sending any traffic for the backups to receive. The arps are not necessarily
2824  * necessary, any tx and rx traffic will keep the current slave up. While any
2825  * rx traffic will keep the backup slaves up, the current slave is responsible
2826  * for generating traffic to keep them up regardless of any other traffic they
2827  * may have received.
2828  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2829  */
2830 void bond_activebackup_arp_mon(struct work_struct *work)
2831 {
2832         struct bonding *bond = container_of(work, struct bonding,
2833                                             arp_work.work);
2834         struct slave *slave;
2835         int delta_in_ticks;
2836         int i;
2837
2838         read_lock(&bond->lock);
2839
2840         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2841
2842         if (bond->kill_timers) {
2843                 goto out;
2844         }
2845
2846         if (bond->slave_cnt == 0) {
2847                 goto re_arm;
2848         }
2849
2850         /* determine if any slave has come up or any backup slave has
2851          * gone down
2852          * TODO: what about up/down delay in arp mode? it wasn't here before
2853          *       so it can wait
2854          */
2855         bond_for_each_slave(bond, slave, i) {
2856                 if (slave->link != BOND_LINK_UP) {
2857                         if (time_before_eq(jiffies,
2858                             slave_last_rx(bond, slave) + delta_in_ticks)) {
2859
2860                                 slave->link = BOND_LINK_UP;
2861
2862                                 write_lock_bh(&bond->curr_slave_lock);
2863
2864                                 if ((!bond->curr_active_slave) &&
2865                                     time_before_eq(jiffies, slave->dev->trans_start + delta_in_ticks)) {
2866                                         bond_change_active_slave(bond, slave);
2867                                         bond->current_arp_slave = NULL;
2868                                 } else if (bond->curr_active_slave != slave) {
2869                                         /* this slave has just come up but we
2870                                          * already have a current slave; this
2871                                          * can also happen if bond_enslave adds
2872                                          * a new slave that is up while we are
2873                                          * searching for a new slave
2874                                          */
2875                                         bond_set_slave_inactive_flags(slave);
2876                                         bond->current_arp_slave = NULL;
2877                                 }
2878
2879                                 bond_set_carrier(bond);
2880
2881                                 if (slave == bond->curr_active_slave) {
2882                                         printk(KERN_INFO DRV_NAME
2883                                                ": %s: %s is up and now the "
2884                                                "active interface\n",
2885                                                bond->dev->name,
2886                                                slave->dev->name);
2887                                         netif_carrier_on(bond->dev);
2888                                 } else {
2889                                         printk(KERN_INFO DRV_NAME
2890                                                ": %s: backup interface %s is "
2891                                                "now up\n",
2892                                                bond->dev->name,
2893                                                slave->dev->name);
2894                                 }
2895
2896                                 write_unlock_bh(&bond->curr_slave_lock);
2897                         }
2898                 } else {
2899                         read_lock(&bond->curr_slave_lock);
2900
2901                         if ((slave != bond->curr_active_slave) &&
2902                             (!bond->current_arp_slave) &&
2903                             (time_after_eq(jiffies, slave_last_rx(bond, slave) + 3*delta_in_ticks) &&
2904                              bond_has_ip(bond))) {
2905                                 /* a backup slave has gone down; three times
2906                                  * the delta allows the current slave to be
2907                                  * taken out before the backup slave.
2908                                  * note: a non-null current_arp_slave indicates
2909                                  * the curr_active_slave went down and we are
2910                                  * searching for a new one; under this
2911                                  * condition we only take the curr_active_slave
2912                                  * down - this gives each slave a chance to
2913                                  * tx/rx traffic before being taken out
2914                                  */
2915
2916                                 read_unlock(&bond->curr_slave_lock);
2917
2918                                 slave->link  = BOND_LINK_DOWN;
2919
2920                                 if (slave->link_failure_count < UINT_MAX) {
2921                                         slave->link_failure_count++;
2922                                 }
2923
2924                                 bond_set_slave_inactive_flags(slave);
2925
2926                                 printk(KERN_INFO DRV_NAME
2927                                        ": %s: backup interface %s is now down\n",
2928                                        bond->dev->name,
2929                                        slave->dev->name);
2930                         } else {
2931                                 read_unlock(&bond->curr_slave_lock);
2932                         }
2933                 }
2934         }
2935
2936         read_lock(&bond->curr_slave_lock);
2937         slave = bond->curr_active_slave;
2938         read_unlock(&bond->curr_slave_lock);
2939
2940         if (slave) {
2941                 /* if we have sent traffic in the past 2*arp_intervals but
2942                  * haven't xmit and rx traffic in that time interval, select
2943                  * a different slave. slave->jiffies is only updated when
2944                  * a slave first becomes the curr_active_slave - not necessarily
2945                  * after every arp; this ensures the slave has a full 2*delta
2946                  * before being taken out. if a primary is being used, check
2947                  * if it is up and needs to take over as the curr_active_slave
2948                  */
2949                 if ((time_after_eq(jiffies, slave->dev->trans_start + 2*delta_in_ticks) ||
2950                         (time_after_eq(jiffies, slave_last_rx(bond, slave) + 2*delta_in_ticks) &&
2951                          bond_has_ip(bond))) &&
2952                         time_after_eq(jiffies, slave->jiffies + 2*delta_in_ticks)) {
2953
2954                         slave->link  = BOND_LINK_DOWN;
2955
2956                         if (slave->link_failure_count < UINT_MAX) {
2957                                 slave->link_failure_count++;
2958                         }
2959
2960                         printk(KERN_INFO DRV_NAME
2961                                ": %s: link status down for active interface "
2962                                "%s, disabling it\n",
2963                                bond->dev->name,
2964                                slave->dev->name);
2965
2966                         write_lock_bh(&bond->curr_slave_lock);
2967
2968                         bond_select_active_slave(bond);
2969                         slave = bond->curr_active_slave;
2970
2971                         write_unlock_bh(&bond->curr_slave_lock);
2972
2973                         bond->current_arp_slave = slave;
2974
2975                         if (slave) {
2976                                 slave->jiffies = jiffies;
2977                         }
2978                 } else if ((bond->primary_slave) &&
2979                            (bond->primary_slave != slave) &&
2980                            (bond->primary_slave->link == BOND_LINK_UP)) {
2981                         /* at this point, slave is the curr_active_slave */
2982                         printk(KERN_INFO DRV_NAME
2983                                ": %s: changing from interface %s to primary "
2984                                "interface %s\n",
2985                                bond->dev->name,
2986                                slave->dev->name,
2987                                bond->primary_slave->dev->name);
2988
2989                         /* primary is up so switch to it */
2990                         write_lock_bh(&bond->curr_slave_lock);
2991                         bond_change_active_slave(bond, bond->primary_slave);
2992                         write_unlock_bh(&bond->curr_slave_lock);
2993
2994                         slave = bond->primary_slave;
2995                         slave->jiffies = jiffies;
2996                 } else {
2997                         bond->current_arp_slave = NULL;
2998                 }
2999
3000                 /* the current slave must tx an arp to ensure backup slaves
3001                  * rx traffic
3002                  */
3003                 if (slave && bond_has_ip(bond)) {
3004                         bond_arp_send_all(bond, slave);
3005                 }
3006         }
3007
3008         /* if we don't have a curr_active_slave, search for the next available
3009          * backup slave from the current_arp_slave and make it the candidate
3010          * for becoming the curr_active_slave
3011          */
3012         if (!slave) {
3013                 if (!bond->current_arp_slave) {
3014                         bond->current_arp_slave = bond->first_slave;
3015                 }
3016
3017                 if (bond->current_arp_slave) {
3018                         bond_set_slave_inactive_flags(bond->current_arp_slave);
3019
3020                         /* search for next candidate */
3021                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3022                                 if (IS_UP(slave->dev)) {
3023                                         slave->link = BOND_LINK_BACK;
3024                                         bond_set_slave_active_flags(slave);
3025                                         bond_arp_send_all(bond, slave);
3026                                         slave->jiffies = jiffies;
3027                                         bond->current_arp_slave = slave;
3028                                         break;
3029                                 }
3030
3031                                 /* if the link state is up at this point, we
3032                                  * mark it down - this can happen if we have
3033                                  * simultaneous link failures and
3034                                  * reselect_active_interface doesn't make this
3035                                  * one the current slave so it is still marked
3036                                  * up when it is actually down
3037                                  */
3038                                 if (slave->link == BOND_LINK_UP) {
3039                                         slave->link  = BOND_LINK_DOWN;
3040                                         if (slave->link_failure_count < UINT_MAX) {
3041                                                 slave->link_failure_count++;
3042                                         }
3043
3044                                         bond_set_slave_inactive_flags(slave);
3045
3046                                         printk(KERN_INFO DRV_NAME
3047                                                ": %s: backup interface %s is "
3048                                                "now down.\n",
3049                                                bond->dev->name,
3050                                                slave->dev->name);
3051                                 }
3052                         }
3053                 }
3054         }
3055
3056 re_arm:
3057         if (bond->params.arp_interval) {
3058                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3059         }
3060 out:
3061         read_unlock(&bond->lock);
3062 }
3063
3064 /*------------------------------ proc/seq_file-------------------------------*/
3065
3066 #ifdef CONFIG_PROC_FS
3067
3068 #define SEQ_START_TOKEN ((void *)1)
3069
3070 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3071 {
3072         struct bonding *bond = seq->private;
3073         loff_t off = 0;
3074         struct slave *slave;
3075         int i;
3076
3077         /* make sure the bond won't be taken away */
3078         read_lock(&dev_base_lock);
3079         read_lock(&bond->lock);
3080
3081         if (*pos == 0) {
3082                 return SEQ_START_TOKEN;
3083         }
3084
3085         bond_for_each_slave(bond, slave, i) {
3086                 if (++off == *pos) {
3087                         return slave;
3088                 }
3089         }
3090
3091         return NULL;
3092 }
3093
3094 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3095 {
3096         struct bonding *bond = seq->private;
3097         struct slave *slave = v;
3098
3099         ++*pos;
3100         if (v == SEQ_START_TOKEN) {
3101                 return bond->first_slave;
3102         }
3103
3104         slave = slave->next;
3105
3106         return (slave == bond->first_slave) ? NULL : slave;
3107 }
3108
3109 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3110 {
3111         struct bonding *bond = seq->private;
3112
3113         read_unlock(&bond->lock);
3114         read_unlock(&dev_base_lock);
3115 }
3116
3117 static void bond_info_show_master(struct seq_file *seq)
3118 {
3119         struct bonding *bond = seq->private;
3120         struct slave *curr;
3121         int i;
3122         u32 target;
3123
3124         read_lock(&bond->curr_slave_lock);
3125         curr = bond->curr_active_slave;
3126         read_unlock(&bond->curr_slave_lock);
3127
3128         seq_printf(seq, "Bonding Mode: %s",
3129                    bond_mode_name(bond->params.mode));
3130
3131         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3132             bond->params.fail_over_mac)
3133                 seq_printf(seq, " (fail_over_mac)");
3134
3135         seq_printf(seq, "\n");
3136
3137         if (bond->params.mode == BOND_MODE_XOR ||
3138                 bond->params.mode == BOND_MODE_8023AD) {
3139                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3140                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3141                         bond->params.xmit_policy);
3142         }
3143
3144         if (USES_PRIMARY(bond->params.mode)) {
3145                 seq_printf(seq, "Primary Slave: %s\n",
3146                            (bond->primary_slave) ?
3147                            bond->primary_slave->dev->name : "None");
3148
3149                 seq_printf(seq, "Currently Active Slave: %s\n",
3150                            (curr) ? curr->dev->name : "None");
3151         }
3152
3153         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3154                    "up" : "down");
3155         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3156         seq_printf(seq, "Up Delay (ms): %d\n",
3157                    bond->params.updelay * bond->params.miimon);
3158         seq_printf(seq, "Down Delay (ms): %d\n",
3159                    bond->params.downdelay * bond->params.miimon);
3160
3161
3162         /* ARP information */
3163         if(bond->params.arp_interval > 0) {
3164                 int printed=0;
3165                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3166                                 bond->params.arp_interval);
3167
3168                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3169
3170                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3171                         if (!bond->params.arp_targets[i])
3172                                 continue;
3173                         if (printed)
3174                                 seq_printf(seq, ",");
3175                         target = ntohl(bond->params.arp_targets[i]);
3176                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
3177                         printed = 1;
3178                 }
3179                 seq_printf(seq, "\n");
3180         }
3181
3182         if (bond->params.mode == BOND_MODE_8023AD) {
3183                 struct ad_info ad_info;
3184                 DECLARE_MAC_BUF(mac);
3185
3186                 seq_puts(seq, "\n802.3ad info\n");
3187                 seq_printf(seq, "LACP rate: %s\n",
3188                            (bond->params.lacp_fast) ? "fast" : "slow");
3189
3190                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3191                         seq_printf(seq, "bond %s has no active aggregator\n",
3192                                    bond->dev->name);
3193                 } else {
3194                         seq_printf(seq, "Active Aggregator Info:\n");
3195
3196                         seq_printf(seq, "\tAggregator ID: %d\n",
3197                                    ad_info.aggregator_id);
3198                         seq_printf(seq, "\tNumber of ports: %d\n",
3199                                    ad_info.ports);
3200                         seq_printf(seq, "\tActor Key: %d\n",
3201                                    ad_info.actor_key);
3202                         seq_printf(seq, "\tPartner Key: %d\n",
3203                                    ad_info.partner_key);
3204                         seq_printf(seq, "\tPartner Mac Address: %s\n",
3205                                    print_mac(mac, ad_info.partner_system));
3206                 }
3207         }
3208 }
3209
3210 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3211 {
3212         struct bonding *bond = seq->private;
3213         DECLARE_MAC_BUF(mac);
3214
3215         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3216         seq_printf(seq, "MII Status: %s\n",
3217                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3218         seq_printf(seq, "Link Failure Count: %u\n",
3219                    slave->link_failure_count);
3220
3221         seq_printf(seq,
3222                    "Permanent HW addr: %s\n",
3223                    print_mac(mac, slave->perm_hwaddr));
3224
3225         if (bond->params.mode == BOND_MODE_8023AD) {
3226                 const struct aggregator *agg
3227                         = SLAVE_AD_INFO(slave).port.aggregator;
3228
3229                 if (agg) {
3230                         seq_printf(seq, "Aggregator ID: %d\n",
3231                                    agg->aggregator_identifier);
3232                 } else {
3233                         seq_puts(seq, "Aggregator ID: N/A\n");
3234                 }
3235         }
3236 }
3237
3238 static int bond_info_seq_show(struct seq_file *seq, void *v)
3239 {
3240         if (v == SEQ_START_TOKEN) {
3241                 seq_printf(seq, "%s\n", version);
3242                 bond_info_show_master(seq);
3243         } else {
3244                 bond_info_show_slave(seq, v);
3245         }
3246
3247         return 0;
3248 }
3249
3250 static struct seq_operations bond_info_seq_ops = {
3251         .start = bond_info_seq_start,
3252         .next  = bond_info_seq_next,
3253         .stop  = bond_info_seq_stop,
3254         .show  = bond_info_seq_show,
3255 };
3256
3257 static int bond_info_open(struct inode *inode, struct file *file)
3258 {
3259         struct seq_file *seq;
3260         struct proc_dir_entry *proc;
3261         int res;
3262
3263         res = seq_open(file, &bond_info_seq_ops);
3264         if (!res) {
3265                 /* recover the pointer buried in proc_dir_entry data */
3266                 seq = file->private_data;
3267                 proc = PDE(inode);
3268                 seq->private = proc->data;
3269         }
3270
3271         return res;
3272 }
3273
3274 static const struct file_operations bond_info_fops = {
3275         .owner   = THIS_MODULE,
3276         .open    = bond_info_open,
3277         .read    = seq_read,
3278         .llseek  = seq_lseek,
3279         .release = seq_release,
3280 };
3281
3282 static int bond_create_proc_entry(struct bonding *bond)
3283 {
3284         struct net_device *bond_dev = bond->dev;
3285
3286         if (bond_proc_dir) {
3287                 bond->proc_entry = create_proc_entry(bond_dev->name,
3288                                                      S_IRUGO,
3289                                                      bond_proc_dir);
3290                 if (bond->proc_entry == NULL) {
3291                         printk(KERN_WARNING DRV_NAME
3292                                ": Warning: Cannot create /proc/net/%s/%s\n",
3293                                DRV_NAME, bond_dev->name);
3294                 } else {
3295                         bond->proc_entry->data = bond;
3296                         bond->proc_entry->proc_fops = &bond_info_fops;
3297                         bond->proc_entry->owner = THIS_MODULE;
3298                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3299                 }
3300         }
3301
3302         return 0;
3303 }
3304
3305 static void bond_remove_proc_entry(struct bonding *bond)
3306 {
3307         if (bond_proc_dir && bond->proc_entry) {
3308                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3309                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3310                 bond->proc_entry = NULL;
3311         }
3312 }
3313
3314 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3315  * Caller must hold rtnl_lock.
3316  */
3317 static void bond_create_proc_dir(void)
3318 {
3319         int len = strlen(DRV_NAME);
3320
3321         for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
3322              bond_proc_dir = bond_proc_dir->next) {
3323                 if ((bond_proc_dir->namelen == len) &&
3324                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3325                         break;
3326                 }
3327         }
3328
3329         if (!bond_proc_dir) {
3330                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3331                 if (bond_proc_dir) {
3332                         bond_proc_dir->owner = THIS_MODULE;
3333                 } else {
3334                         printk(KERN_WARNING DRV_NAME
3335                                 ": Warning: cannot create /proc/net/%s\n",
3336                                 DRV_NAME);
3337                 }
3338         }
3339 }
3340
3341 /* Destroy the bonding directory under /proc/net, if empty.
3342  * Caller must hold rtnl_lock.
3343  */
3344 static void bond_destroy_proc_dir(void)
3345 {
3346         struct proc_dir_entry *de;
3347
3348         if (!bond_proc_dir) {
3349                 return;
3350         }
3351
3352         /* verify that the /proc dir is empty */
3353         for (de = bond_proc_dir->subdir; de; de = de->next) {
3354                 /* ignore . and .. */
3355                 if (*(de->name) != '.') {
3356                         break;
3357                 }
3358         }
3359
3360         if (de) {
3361                 if (bond_proc_dir->owner == THIS_MODULE) {
3362                         bond_proc_dir->owner = NULL;
3363                 }
3364         } else {
3365                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3366                 bond_proc_dir = NULL;
3367         }
3368 }
3369 #endif /* CONFIG_PROC_FS */
3370
3371 /*-------------------------- netdev event handling --------------------------*/
3372
3373 /*
3374  * Change device name
3375  */
3376 static int bond_event_changename(struct bonding *bond)
3377 {
3378 #ifdef CONFIG_PROC_FS
3379         bond_remove_proc_entry(bond);
3380         bond_create_proc_entry(bond);
3381 #endif
3382         down_write(&(bonding_rwsem));
3383         bond_destroy_sysfs_entry(bond);
3384         bond_create_sysfs_entry(bond);
3385         up_write(&(bonding_rwsem));
3386         return NOTIFY_DONE;
3387 }
3388
3389 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3390 {
3391         struct bonding *event_bond = bond_dev->priv;
3392
3393         switch (event) {
3394         case NETDEV_CHANGENAME:
3395                 return bond_event_changename(event_bond);
3396         case NETDEV_UNREGISTER:
3397                 bond_release_all(event_bond->dev);
3398                 break;
3399         default:
3400                 break;
3401         }
3402
3403         return NOTIFY_DONE;
3404 }
3405
3406 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3407 {
3408         struct net_device *bond_dev = slave_dev->master;
3409         struct bonding *bond = bond_dev->priv;
3410
3411         switch (event) {
3412         case NETDEV_UNREGISTER:
3413                 if (bond_dev) {
3414                         if (bond->setup_by_slave)
3415                                 bond_release_and_destroy(bond_dev, slave_dev);
3416                         else
3417                                 bond_release(bond_dev, slave_dev);
3418                 }
3419                 break;
3420         case NETDEV_CHANGE:
3421                 /*
3422                  * TODO: is this what we get if somebody
3423                  * sets up a hierarchical bond, then rmmod's
3424                  * one of the slave bonding devices?
3425                  */
3426                 break;
3427         case NETDEV_DOWN:
3428                 /*
3429                  * ... Or is it this?
3430                  */
3431                 break;
3432         case NETDEV_CHANGEMTU:
3433                 /*
3434                  * TODO: Should slaves be allowed to
3435                  * independently alter their MTU?  For
3436                  * an active-backup bond, slaves need
3437                  * not be the same type of device, so
3438                  * MTUs may vary.  For other modes,
3439                  * slaves arguably should have the
3440                  * same MTUs. To do this, we'd need to
3441                  * take over the slave's change_mtu
3442                  * function for the duration of their
3443                  * servitude.
3444                  */
3445                 break;
3446         case NETDEV_CHANGENAME:
3447                 /*
3448                  * TODO: handle changing the primary's name
3449                  */
3450                 break;
3451         case NETDEV_FEAT_CHANGE:
3452                 bond_compute_features(bond);
3453                 break;
3454         default:
3455                 break;
3456         }
3457
3458         return NOTIFY_DONE;
3459 }
3460
3461 /*
3462  * bond_netdev_event: handle netdev notifier chain events.
3463  *
3464  * This function receives events for the netdev chain.  The caller (an
3465  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3466  * locks for us to safely manipulate the slave devices (RTNL lock,
3467  * dev_probe_lock).
3468  */
3469 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3470 {
3471         struct net_device *event_dev = (struct net_device *)ptr;
3472
3473         if (event_dev->nd_net != &init_net)
3474                 return NOTIFY_DONE;
3475
3476         dprintk("event_dev: %s, event: %lx\n",
3477                 (event_dev ? event_dev->name : "None"),
3478                 event);
3479
3480         if (!(event_dev->priv_flags & IFF_BONDING))
3481                 return NOTIFY_DONE;
3482
3483         if (event_dev->flags & IFF_MASTER) {
3484                 dprintk("IFF_MASTER\n");
3485                 return bond_master_netdev_event(event, event_dev);
3486         }
3487
3488         if (event_dev->flags & IFF_SLAVE) {
3489                 dprintk("IFF_SLAVE\n");
3490                 return bond_slave_netdev_event(event, event_dev);
3491         }
3492
3493         return NOTIFY_DONE;
3494 }
3495
3496 /*
3497  * bond_inetaddr_event: handle inetaddr notifier chain events.
3498  *
3499  * We keep track of device IPs primarily to use as source addresses in
3500  * ARP monitor probes (rather than spewing out broadcasts all the time).
3501  *
3502  * We track one IP for the main device (if it has one), plus one per VLAN.
3503  */
3504 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3505 {
3506         struct in_ifaddr *ifa = ptr;
3507         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3508         struct bonding *bond, *bond_next;
3509         struct vlan_entry *vlan, *vlan_next;
3510
3511         if (ifa->ifa_dev->dev->nd_net != &init_net)
3512                 return NOTIFY_DONE;
3513
3514         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3515                 if (bond->dev == event_dev) {
3516                         switch (event) {
3517                         case NETDEV_UP:
3518                                 bond->master_ip = ifa->ifa_local;
3519                                 return NOTIFY_OK;
3520                         case NETDEV_DOWN:
3521                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3522                                 return NOTIFY_OK;
3523                         default:
3524                                 return NOTIFY_DONE;
3525                         }
3526                 }
3527
3528                 if (list_empty(&bond->vlan_list))
3529                         continue;
3530
3531                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3532                                          vlan_list) {
3533                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3534                         if (vlan_dev == event_dev) {
3535                                 switch (event) {
3536                                 case NETDEV_UP:
3537                                         vlan->vlan_ip = ifa->ifa_local;
3538                                         return NOTIFY_OK;
3539                                 case NETDEV_DOWN:
3540                                         vlan->vlan_ip =
3541                                                 bond_glean_dev_ip(vlan_dev);
3542                                         return NOTIFY_OK;
3543                                 default:
3544                                         return NOTIFY_DONE;
3545                                 }
3546                         }
3547                 }
3548         }
3549         return NOTIFY_DONE;
3550 }
3551
3552 static struct notifier_block bond_netdev_notifier = {
3553         .notifier_call = bond_netdev_event,
3554 };
3555
3556 static struct notifier_block bond_inetaddr_notifier = {
3557         .notifier_call = bond_inetaddr_event,
3558 };
3559
3560 /*-------------------------- Packet type handling ---------------------------*/
3561
3562 /* register to receive lacpdus on a bond */
3563 static void bond_register_lacpdu(struct bonding *bond)
3564 {
3565         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3566
3567         /* initialize packet type */
3568         pk_type->type = PKT_TYPE_LACPDU;
3569         pk_type->dev = bond->dev;
3570         pk_type->func = bond_3ad_lacpdu_recv;
3571
3572         dev_add_pack(pk_type);
3573 }
3574
3575 /* unregister to receive lacpdus on a bond */
3576 static void bond_unregister_lacpdu(struct bonding *bond)
3577 {
3578         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3579 }
3580
3581 void bond_register_arp(struct bonding *bond)
3582 {
3583         struct packet_type *pt = &bond->arp_mon_pt;
3584
3585         if (pt->type)
3586                 return;
3587
3588         pt->type = htons(ETH_P_ARP);
3589         pt->dev = bond->dev;
3590         pt->func = bond_arp_rcv;
3591         dev_add_pack(pt);
3592 }
3593
3594 void bond_unregister_arp(struct bonding *bond)
3595 {
3596         struct packet_type *pt = &bond->arp_mon_pt;
3597
3598         dev_remove_pack(pt);
3599         pt->type = 0;
3600 }
3601
3602 /*---------------------------- Hashing Policies -----------------------------*/
3603
3604 /*
3605  * Hash for the output device based upon layer 2 and layer 3 data. If
3606  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3607  */
3608 static int bond_xmit_hash_policy_l23(struct sk_buff *skb,
3609                                      struct net_device *bond_dev, int count)
3610 {
3611         struct ethhdr *data = (struct ethhdr *)skb->data;
3612         struct iphdr *iph = ip_hdr(skb);
3613
3614         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3615                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3616                         (data->h_dest[5] ^ bond_dev->dev_addr[5])) % count;
3617         }
3618
3619         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3620 }
3621
3622 /*
3623  * Hash for the output device based upon layer 3 and layer 4 data. If
3624  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3625  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3626  */
3627 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3628                                     struct net_device *bond_dev, int count)
3629 {
3630         struct ethhdr *data = (struct ethhdr *)skb->data;
3631         struct iphdr *iph = ip_hdr(skb);
3632         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3633         int layer4_xor = 0;
3634
3635         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3636                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3637                     (iph->protocol == IPPROTO_TCP ||
3638                      iph->protocol == IPPROTO_UDP)) {
3639                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3640                 }
3641                 return (layer4_xor ^
3642                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3643
3644         }
3645
3646         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3647 }
3648
3649 /*
3650  * Hash for the output device based upon layer 2 data
3651  */
3652 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3653                                    struct net_device *bond_dev, int count)
3654 {
3655         struct ethhdr *data = (struct ethhdr *)skb->data;
3656
3657         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3658 }
3659
3660 /*-------------------------- Device entry points ----------------------------*/
3661
3662 static int bond_open(struct net_device *bond_dev)
3663 {
3664         struct bonding *bond = bond_dev->priv;
3665
3666         bond->kill_timers = 0;
3667
3668         if ((bond->params.mode == BOND_MODE_TLB) ||
3669             (bond->params.mode == BOND_MODE_ALB)) {
3670                 /* bond_alb_initialize must be called before the timer
3671                  * is started.
3672                  */
3673                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3674                         /* something went wrong - fail the open operation */
3675                         return -1;
3676                 }
3677
3678                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3679                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3680         }
3681
3682         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3683                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3684                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3685         }
3686
3687         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3688                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3689                         INIT_DELAYED_WORK(&bond->arp_work,
3690                                           bond_activebackup_arp_mon);
3691                 else
3692                         INIT_DELAYED_WORK(&bond->arp_work,
3693                                           bond_loadbalance_arp_mon);
3694
3695                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3696                 if (bond->params.arp_validate)
3697                         bond_register_arp(bond);
3698         }
3699
3700         if (bond->params.mode == BOND_MODE_8023AD) {
3701                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3702                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3703                 /* register to receive LACPDUs */
3704                 bond_register_lacpdu(bond);
3705         }
3706
3707         return 0;
3708 }
3709
3710 static int bond_close(struct net_device *bond_dev)
3711 {
3712         struct bonding *bond = bond_dev->priv;
3713
3714         if (bond->params.mode == BOND_MODE_8023AD) {
3715                 /* Unregister the receive of LACPDUs */
3716                 bond_unregister_lacpdu(bond);
3717         }
3718
3719         if (bond->params.arp_validate)
3720                 bond_unregister_arp(bond);
3721
3722         write_lock_bh(&bond->lock);
3723
3724
3725         /* signal timers not to re-arm */
3726         bond->kill_timers = 1;
3727
3728         write_unlock_bh(&bond->lock);
3729
3730         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3731                 cancel_delayed_work(&bond->mii_work);
3732         }
3733
3734         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3735                 cancel_delayed_work(&bond->arp_work);
3736         }
3737
3738         switch (bond->params.mode) {
3739         case BOND_MODE_8023AD:
3740                 cancel_delayed_work(&bond->ad_work);
3741                 break;
3742         case BOND_MODE_TLB:
3743         case BOND_MODE_ALB:
3744                 cancel_delayed_work(&bond->alb_work);
3745                 break;
3746         default:
3747                 break;
3748         }
3749
3750
3751         if ((bond->params.mode == BOND_MODE_TLB) ||
3752             (bond->params.mode == BOND_MODE_ALB)) {
3753                 /* Must be called only after all
3754                  * slaves have been released
3755                  */
3756                 bond_alb_deinitialize(bond);
3757         }
3758
3759         return 0;
3760 }
3761
3762 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3763 {
3764         struct bonding *bond = bond_dev->priv;
3765         struct net_device_stats *stats = &(bond->stats), *sstats;
3766         struct net_device_stats local_stats;
3767         struct slave *slave;
3768         int i;
3769
3770         memset(&local_stats, 0, sizeof(struct net_device_stats));
3771
3772         read_lock_bh(&bond->lock);
3773
3774         bond_for_each_slave(bond, slave, i) {
3775                 sstats = slave->dev->get_stats(slave->dev);
3776                 local_stats.rx_packets += sstats->rx_packets;
3777                 local_stats.rx_bytes += sstats->rx_bytes;
3778                 local_stats.rx_errors += sstats->rx_errors;
3779                 local_stats.rx_dropped += sstats->rx_dropped;
3780
3781                 local_stats.tx_packets += sstats->tx_packets;
3782                 local_stats.tx_bytes += sstats->tx_bytes;
3783                 local_stats.tx_errors += sstats->tx_errors;
3784                 local_stats.tx_dropped += sstats->tx_dropped;
3785
3786                 local_stats.multicast += sstats->multicast;
3787                 local_stats.collisions += sstats->collisions;
3788
3789                 local_stats.rx_length_errors += sstats->rx_length_errors;
3790                 local_stats.rx_over_errors += sstats->rx_over_errors;
3791                 local_stats.rx_crc_errors += sstats->rx_crc_errors;
3792                 local_stats.rx_frame_errors += sstats->rx_frame_errors;
3793                 local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
3794                 local_stats.rx_missed_errors += sstats->rx_missed_errors;
3795
3796                 local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
3797                 local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
3798                 local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
3799                 local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3800                 local_stats.tx_window_errors += sstats->tx_window_errors;
3801         }
3802
3803         memcpy(stats, &local_stats, sizeof(struct net_device_stats));
3804
3805         read_unlock_bh(&bond->lock);
3806
3807         return stats;
3808 }
3809
3810 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3811 {
3812         struct net_device *slave_dev = NULL;
3813         struct ifbond k_binfo;
3814         struct ifbond __user *u_binfo = NULL;
3815         struct ifslave k_sinfo;
3816         struct ifslave __user *u_sinfo = NULL;
3817         struct mii_ioctl_data *mii = NULL;
3818         int res = 0;
3819
3820         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3821                 bond_dev->name, cmd);
3822
3823         switch (cmd) {
3824         case SIOCGMIIPHY:
3825                 mii = if_mii(ifr);
3826                 if (!mii) {
3827                         return -EINVAL;
3828                 }
3829                 mii->phy_id = 0;
3830                 /* Fall Through */
3831         case SIOCGMIIREG:
3832                 /*
3833                  * We do this again just in case we were called by SIOCGMIIREG
3834                  * instead of SIOCGMIIPHY.
3835                  */
3836                 mii = if_mii(ifr);
3837                 if (!mii) {
3838                         return -EINVAL;
3839                 }
3840
3841                 if (mii->reg_num == 1) {
3842                         struct bonding *bond = bond_dev->priv;
3843                         mii->val_out = 0;
3844                         read_lock(&bond->lock);
3845                         read_lock(&bond->curr_slave_lock);
3846                         if (netif_carrier_ok(bond->dev)) {
3847                                 mii->val_out = BMSR_LSTATUS;
3848                         }
3849                         read_unlock(&bond->curr_slave_lock);
3850                         read_unlock(&bond->lock);
3851                 }
3852
3853                 return 0;
3854         case BOND_INFO_QUERY_OLD:
3855         case SIOCBONDINFOQUERY:
3856                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3857
3858                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3859                         return -EFAULT;
3860                 }
3861
3862                 res = bond_info_query(bond_dev, &k_binfo);
3863                 if (res == 0) {
3864                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3865                                 return -EFAULT;
3866                         }
3867                 }
3868
3869                 return res;
3870         case BOND_SLAVE_INFO_QUERY_OLD:
3871         case SIOCBONDSLAVEINFOQUERY:
3872                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3873
3874                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3875                         return -EFAULT;
3876                 }
3877
3878                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3879                 if (res == 0) {
3880                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3881                                 return -EFAULT;
3882                         }
3883                 }
3884
3885                 return res;
3886         default:
3887                 /* Go on */
3888                 break;
3889         }
3890
3891         if (!capable(CAP_NET_ADMIN)) {
3892                 return -EPERM;
3893         }
3894
3895         down_write(&(bonding_rwsem));
3896         slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
3897
3898         dprintk("slave_dev=%p: \n", slave_dev);
3899
3900         if (!slave_dev) {
3901                 res = -ENODEV;
3902         } else {
3903                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3904                 switch (cmd) {
3905                 case BOND_ENSLAVE_OLD:
3906                 case SIOCBONDENSLAVE:
3907                         res = bond_enslave(bond_dev, slave_dev);
3908                         break;
3909                 case BOND_RELEASE_OLD:
3910                 case SIOCBONDRELEASE:
3911                         res = bond_release(bond_dev, slave_dev);
3912                         break;
3913                 case BOND_SETHWADDR_OLD:
3914                 case SIOCBONDSETHWADDR:
3915                         res = bond_sethwaddr(bond_dev, slave_dev);
3916                         break;
3917                 case BOND_CHANGE_ACTIVE_OLD:
3918                 case SIOCBONDCHANGEACTIVE:
3919                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3920                         break;
3921                 default:
3922                         res = -EOPNOTSUPP;
3923                 }
3924
3925                 dev_put(slave_dev);
3926         }
3927
3928         up_write(&(bonding_rwsem));
3929         return res;
3930 }
3931
3932 static void bond_set_multicast_list(struct net_device *bond_dev)
3933 {
3934         struct bonding *bond = bond_dev->priv;
3935         struct dev_mc_list *dmi;
3936
3937         /*
3938          * Do promisc before checking multicast_mode
3939          */
3940         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3941                 bond_set_promiscuity(bond, 1);
3942         }
3943
3944         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3945                 bond_set_promiscuity(bond, -1);
3946         }
3947
3948         /* set allmulti flag to slaves */
3949         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3950                 bond_set_allmulti(bond, 1);
3951         }
3952
3953         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3954                 bond_set_allmulti(bond, -1);
3955         }
3956
3957         read_lock(&bond->lock);
3958
3959         bond->flags = bond_dev->flags;
3960
3961         /* looking for addresses to add to slaves' mc list */
3962         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3963                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3964                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3965                 }
3966         }
3967
3968         /* looking for addresses to delete from slaves' list */
3969         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3970                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3971                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3972                 }
3973         }
3974
3975         /* save master's multicast list */
3976         bond_mc_list_destroy(bond);
3977         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3978
3979         read_unlock(&bond->lock);
3980 }
3981
3982 /*
3983  * Change the MTU of all of a master's slaves to match the master
3984  */
3985 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3986 {
3987         struct bonding *bond = bond_dev->priv;
3988         struct slave *slave, *stop_at;
3989         int res = 0;
3990         int i;
3991
3992         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3993                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3994
3995         /* Can't hold bond->lock with bh disabled here since
3996          * some base drivers panic. On the other hand we can't
3997          * hold bond->lock without bh disabled because we'll
3998          * deadlock. The only solution is to rely on the fact
3999          * that we're under rtnl_lock here, and the slaves
4000          * list won't change. This doesn't solve the problem
4001          * of setting the slave's MTU while it is
4002          * transmitting, but the assumption is that the base
4003          * driver can handle that.
4004          *
4005          * TODO: figure out a way to safely iterate the slaves
4006          * list, but without holding a lock around the actual
4007          * call to the base driver.
4008          */
4009
4010         bond_for_each_slave(bond, slave, i) {
4011                 dprintk("s %p s->p %p c_m %p\n", slave,
4012                         slave->prev, slave->dev->change_mtu);
4013
4014                 res = dev_set_mtu(slave->dev, new_mtu);
4015
4016                 if (res) {
4017                         /* If we failed to set the slave's mtu to the new value
4018                          * we must abort the operation even in ACTIVE_BACKUP
4019                          * mode, because if we allow the backup slaves to have
4020                          * different mtu values than the active slave we'll
4021                          * need to change their mtu when doing a failover. That
4022                          * means changing their mtu from timer context, which
4023                          * is probably not a good idea.
4024                          */
4025                         dprintk("err %d %s\n", res, slave->dev->name);
4026                         goto unwind;
4027                 }
4028         }
4029
4030         bond_dev->mtu = new_mtu;
4031
4032         return 0;
4033
4034 unwind:
4035         /* unwind from head to the slave that failed */
4036         stop_at = slave;
4037         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4038                 int tmp_res;
4039
4040                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4041                 if (tmp_res) {
4042                         dprintk("unwind err %d dev %s\n", tmp_res,
4043                                 slave->dev->name);
4044                 }
4045         }
4046
4047         return res;
4048 }
4049
4050 /*
4051  * Change HW address
4052  *
4053  * Note that many devices must be down to change the HW address, and
4054  * downing the master releases all slaves.  We can make bonds full of
4055  * bonding devices to test this, however.
4056  */
4057 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4058 {
4059         struct bonding *bond = bond_dev->priv;
4060         struct sockaddr *sa = addr, tmp_sa;
4061         struct slave *slave, *stop_at;
4062         int res = 0;
4063         int i;
4064
4065         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
4066
4067         /*
4068          * If fail_over_mac is enabled, do nothing and return success.
4069          * Returning an error causes ifenslave to fail.
4070          */
4071         if (bond->params.fail_over_mac)
4072                 return 0;
4073
4074         if (!is_valid_ether_addr(sa->sa_data)) {
4075                 return -EADDRNOTAVAIL;
4076         }
4077
4078         /* Can't hold bond->lock with bh disabled here since
4079          * some base drivers panic. On the other hand we can't
4080          * hold bond->lock without bh disabled because we'll
4081          * deadlock. The only solution is to rely on the fact
4082          * that we're under rtnl_lock here, and the slaves
4083          * list won't change. This doesn't solve the problem
4084          * of setting the slave's hw address while it is
4085          * transmitting, but the assumption is that the base
4086          * driver can handle that.
4087          *
4088          * TODO: figure out a way to safely iterate the slaves
4089          * list, but without holding a lock around the actual
4090          * call to the base driver.
4091          */
4092
4093         bond_for_each_slave(bond, slave, i) {
4094                 dprintk("slave %p %s\n", slave, slave->dev->name);
4095
4096                 if (slave->dev->set_mac_address == NULL) {
4097                         res = -EOPNOTSUPP;
4098                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
4099                         goto unwind;
4100                 }
4101
4102                 res = dev_set_mac_address(slave->dev, addr);
4103                 if (res) {
4104                         /* TODO: consider downing the slave
4105                          * and retry ?
4106                          * User should expect communications
4107                          * breakage anyway until ARP finish
4108                          * updating, so...
4109                          */
4110                         dprintk("err %d %s\n", res, slave->dev->name);
4111                         goto unwind;
4112                 }
4113         }
4114
4115         /* success */
4116         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4117         return 0;
4118
4119 unwind:
4120         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4121         tmp_sa.sa_family = bond_dev->type;
4122
4123         /* unwind from head to the slave that failed */
4124         stop_at = slave;
4125         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4126                 int tmp_res;
4127
4128                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4129                 if (tmp_res) {
4130                         dprintk("unwind err %d dev %s\n", tmp_res,
4131                                 slave->dev->name);
4132                 }
4133         }
4134
4135         return res;
4136 }
4137
4138 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4139 {
4140         struct bonding *bond = bond_dev->priv;
4141         struct slave *slave, *start_at;
4142         int i, slave_no, res = 1;
4143
4144         read_lock(&bond->lock);
4145
4146         if (!BOND_IS_OK(bond)) {
4147                 goto out;
4148         }
4149
4150         /*
4151          * Concurrent TX may collide on rr_tx_counter; we accept that
4152          * as being rare enough not to justify using an atomic op here
4153          */
4154         slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4155
4156         bond_for_each_slave(bond, slave, i) {
4157                 slave_no--;
4158                 if (slave_no < 0) {
4159                         break;
4160                 }
4161         }
4162
4163         start_at = slave;
4164         bond_for_each_slave_from(bond, slave, i, start_at) {
4165                 if (IS_UP(slave->dev) &&
4166                     (slave->link == BOND_LINK_UP) &&
4167                     (slave->state == BOND_STATE_ACTIVE)) {
4168                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4169                         break;
4170                 }
4171         }
4172
4173 out:
4174         if (res) {
4175                 /* no suitable interface, frame not sent */
4176                 dev_kfree_skb(skb);
4177         }
4178         read_unlock(&bond->lock);
4179         return 0;
4180 }
4181
4182
4183 /*
4184  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4185  * the bond has a usable interface.
4186  */
4187 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4188 {
4189         struct bonding *bond = bond_dev->priv;
4190         int res = 1;
4191
4192         read_lock(&bond->lock);
4193         read_lock(&bond->curr_slave_lock);
4194
4195         if (!BOND_IS_OK(bond)) {
4196                 goto out;
4197         }
4198
4199         if (!bond->curr_active_slave)
4200                 goto out;
4201
4202         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4203
4204 out:
4205         if (res) {
4206                 /* no suitable interface, frame not sent */
4207                 dev_kfree_skb(skb);
4208         }
4209         read_unlock(&bond->curr_slave_lock);
4210         read_unlock(&bond->lock);
4211         return 0;
4212 }
4213
4214 /*
4215  * In bond_xmit_xor() , we determine the output device by using a pre-
4216  * determined xmit_hash_policy(), If the selected device is not enabled,
4217  * find the next active slave.
4218  */
4219 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4220 {
4221         struct bonding *bond = bond_dev->priv;
4222         struct slave *slave, *start_at;
4223         int slave_no;
4224         int i;
4225         int res = 1;
4226
4227         read_lock(&bond->lock);
4228
4229         if (!BOND_IS_OK(bond)) {
4230                 goto out;
4231         }
4232
4233         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4234
4235         bond_for_each_slave(bond, slave, i) {
4236                 slave_no--;
4237                 if (slave_no < 0) {
4238                         break;
4239                 }
4240         }
4241
4242         start_at = slave;
4243
4244         bond_for_each_slave_from(bond, slave, i, start_at) {
4245                 if (IS_UP(slave->dev) &&
4246                     (slave->link == BOND_LINK_UP) &&
4247                     (slave->state == BOND_STATE_ACTIVE)) {
4248                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4249                         break;
4250                 }
4251         }
4252
4253 out:
4254         if (res) {
4255                 /* no suitable interface, frame not sent */
4256                 dev_kfree_skb(skb);
4257         }
4258         read_unlock(&bond->lock);
4259         return 0;
4260 }
4261
4262 /*
4263  * in broadcast mode, we send everything to all usable interfaces.
4264  */
4265 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4266 {
4267         struct bonding *bond = bond_dev->priv;
4268         struct slave *slave, *start_at;
4269         struct net_device *tx_dev = NULL;
4270         int i;
4271         int res = 1;
4272
4273         read_lock(&bond->lock);
4274
4275         if (!BOND_IS_OK(bond)) {
4276                 goto out;
4277         }
4278
4279         read_lock(&bond->curr_slave_lock);
4280         start_at = bond->curr_active_slave;
4281         read_unlock(&bond->curr_slave_lock);
4282
4283         if (!start_at) {
4284                 goto out;
4285         }
4286
4287         bond_for_each_slave_from(bond, slave, i, start_at) {
4288                 if (IS_UP(slave->dev) &&
4289                     (slave->link == BOND_LINK_UP) &&
4290                     (slave->state == BOND_STATE_ACTIVE)) {
4291                         if (tx_dev) {
4292                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4293                                 if (!skb2) {
4294                                         printk(KERN_ERR DRV_NAME
4295                                                ": %s: Error: bond_xmit_broadcast(): "
4296                                                "skb_clone() failed\n",
4297                                                bond_dev->name);
4298                                         continue;
4299                                 }
4300
4301                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4302                                 if (res) {
4303                                         dev_kfree_skb(skb2);
4304                                         continue;
4305                                 }
4306                         }
4307                         tx_dev = slave->dev;
4308                 }
4309         }
4310
4311         if (tx_dev) {
4312                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4313         }
4314
4315 out:
4316         if (res) {
4317                 /* no suitable interface, frame not sent */
4318                 dev_kfree_skb(skb);
4319         }
4320         /* frame sent to all suitable interfaces */
4321         read_unlock(&bond->lock);
4322         return 0;
4323 }
4324
4325 /*------------------------- Device initialization ---------------------------*/
4326
4327 static void bond_set_xmit_hash_policy(struct bonding *bond)
4328 {
4329         switch (bond->params.xmit_policy) {
4330         case BOND_XMIT_POLICY_LAYER23:
4331                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4332                 break;
4333         case BOND_XMIT_POLICY_LAYER34:
4334                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4335                 break;
4336         case BOND_XMIT_POLICY_LAYER2:
4337         default:
4338                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4339                 break;
4340         }
4341 }
4342
4343 /*
4344  * set bond mode specific net device operations
4345  */
4346 void bond_set_mode_ops(struct bonding *bond, int mode)
4347 {
4348         struct net_device *bond_dev = bond->dev;
4349
4350         switch (mode) {
4351         case BOND_MODE_ROUNDROBIN:
4352                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4353                 break;
4354         case BOND_MODE_ACTIVEBACKUP:
4355                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4356                 break;
4357         case BOND_MODE_XOR:
4358                 bond_dev->hard_start_xmit = bond_xmit_xor;
4359                 bond_set_xmit_hash_policy(bond);
4360                 break;
4361         case BOND_MODE_BROADCAST:
4362                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4363                 break;
4364         case BOND_MODE_8023AD:
4365                 bond_set_master_3ad_flags(bond);
4366                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4367                 bond_set_xmit_hash_policy(bond);
4368                 break;
4369         case BOND_MODE_ALB:
4370                 bond_set_master_alb_flags(bond);
4371                 /* FALLTHRU */
4372         case BOND_MODE_TLB:
4373                 bond_dev->hard_start_xmit = bond_alb_xmit;
4374                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4375                 break;
4376         default:
4377                 /* Should never happen, mode already checked */
4378                 printk(KERN_ERR DRV_NAME
4379                        ": %s: Error: Unknown bonding mode %d\n",
4380                        bond_dev->name,
4381                        mode);
4382                 break;
4383         }
4384 }
4385
4386 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4387                                     struct ethtool_drvinfo *drvinfo)
4388 {
4389         strncpy(drvinfo->driver, DRV_NAME, 32);
4390         strncpy(drvinfo->version, DRV_VERSION, 32);
4391         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4392 }
4393
4394 static const struct ethtool_ops bond_ethtool_ops = {
4395         .get_drvinfo            = bond_ethtool_get_drvinfo,
4396 };
4397
4398 /*
4399  * Does not allocate but creates a /proc entry.
4400  * Allowed to fail.
4401  */
4402 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4403 {
4404         struct bonding *bond = bond_dev->priv;
4405
4406         dprintk("Begin bond_init for %s\n", bond_dev->name);
4407
4408         /* initialize rwlocks */
4409         rwlock_init(&bond->lock);
4410         rwlock_init(&bond->curr_slave_lock);
4411
4412         bond->params = *params; /* copy params struct */
4413
4414         bond->wq = create_singlethread_workqueue(bond_dev->name);
4415         if (!bond->wq)
4416                 return -ENOMEM;
4417
4418         /* Initialize pointers */
4419         bond->first_slave = NULL;
4420         bond->curr_active_slave = NULL;
4421         bond->current_arp_slave = NULL;
4422         bond->primary_slave = NULL;
4423         bond->dev = bond_dev;
4424         bond->send_grat_arp = 0;
4425         bond->setup_by_slave = 0;
4426         INIT_LIST_HEAD(&bond->vlan_list);
4427
4428         /* Initialize the device entry points */
4429         bond_dev->open = bond_open;
4430         bond_dev->stop = bond_close;
4431         bond_dev->get_stats = bond_get_stats;
4432         bond_dev->do_ioctl = bond_do_ioctl;
4433         bond_dev->ethtool_ops = &bond_ethtool_ops;
4434         bond_dev->set_multicast_list = bond_set_multicast_list;
4435         bond_dev->change_mtu = bond_change_mtu;
4436         bond_dev->set_mac_address = bond_set_mac_address;
4437         bond_dev->validate_addr = NULL;
4438
4439         bond_set_mode_ops(bond, bond->params.mode);
4440
4441         bond_dev->destructor = free_netdev;
4442
4443         /* Initialize the device options */
4444         bond_dev->tx_queue_len = 0;
4445         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4446         bond_dev->priv_flags |= IFF_BONDING;
4447
4448         /* At first, we block adding VLANs. That's the only way to
4449          * prevent problems that occur when adding VLANs over an
4450          * empty bond. The block will be removed once non-challenged
4451          * slaves are enslaved.
4452          */
4453         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4454
4455         /* don't acquire bond device's netif_tx_lock when
4456          * transmitting */
4457         bond_dev->features |= NETIF_F_LLTX;
4458
4459         /* By default, we declare the bond to be fully
4460          * VLAN hardware accelerated capable. Special
4461          * care is taken in the various xmit functions
4462          * when there are slaves that are not hw accel
4463          * capable
4464          */
4465         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4466         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4467         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4468         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4469                                NETIF_F_HW_VLAN_RX |
4470                                NETIF_F_HW_VLAN_FILTER);
4471
4472 #ifdef CONFIG_PROC_FS
4473         bond_create_proc_entry(bond);
4474 #endif
4475         list_add_tail(&bond->bond_list, &bond_dev_list);
4476
4477         return 0;
4478 }
4479
4480 /* De-initialize device specific data.
4481  * Caller must hold rtnl_lock.
4482  */
4483 static void bond_deinit(struct net_device *bond_dev)
4484 {
4485         struct bonding *bond = bond_dev->priv;
4486
4487         list_del(&bond->bond_list);
4488
4489 #ifdef CONFIG_PROC_FS
4490         bond_remove_proc_entry(bond);
4491 #endif
4492 }
4493
4494 static void bond_work_cancel_all(struct bonding *bond)
4495 {
4496         write_lock_bh(&bond->lock);
4497         bond->kill_timers = 1;
4498         write_unlock_bh(&bond->lock);
4499
4500         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4501                 cancel_delayed_work(&bond->mii_work);
4502
4503         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4504                 cancel_delayed_work(&bond->arp_work);
4505
4506         if (bond->params.mode == BOND_MODE_ALB &&
4507             delayed_work_pending(&bond->alb_work))
4508                 cancel_delayed_work(&bond->alb_work);
4509
4510         if (bond->params.mode == BOND_MODE_8023AD &&
4511             delayed_work_pending(&bond->ad_work))
4512                 cancel_delayed_work(&bond->ad_work);
4513 }
4514
4515 /* Unregister and free all bond devices.
4516  * Caller must hold rtnl_lock.
4517  */
4518 static void bond_free_all(void)
4519 {
4520         struct bonding *bond, *nxt;
4521
4522         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4523                 struct net_device *bond_dev = bond->dev;
4524
4525                 bond_work_cancel_all(bond);
4526                 netif_tx_lock_bh(bond_dev);
4527                 bond_mc_list_destroy(bond);
4528                 netif_tx_unlock_bh(bond_dev);
4529                 /* Release the bonded slaves */
4530                 bond_release_all(bond_dev);
4531                 bond_deinit(bond_dev);
4532                 unregister_netdevice(bond_dev);
4533         }
4534
4535 #ifdef CONFIG_PROC_FS
4536         bond_destroy_proc_dir();
4537 #endif
4538 }
4539
4540 /*------------------------- Module initialization ---------------------------*/
4541
4542 /*
4543  * Convert string input module parms.  Accept either the
4544  * number of the mode or its string name.  A bit complicated because
4545  * some mode names are substrings of other names, and calls from sysfs
4546  * may have whitespace in the name (trailing newlines, for example).
4547  */
4548 int bond_parse_parm(const char *buf, struct bond_parm_tbl *tbl)
4549 {
4550         int mode = -1, i, rv;
4551         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4552
4553         for (p = (char *)buf; *p; p++)
4554                 if (!(isdigit(*p) || isspace(*p)))
4555                         break;
4556
4557         if (*p)
4558                 rv = sscanf(buf, "%20s", modestr);
4559         else
4560                 rv = sscanf(buf, "%d", &mode);
4561
4562         if (!rv)
4563                 return -1;
4564
4565         for (i = 0; tbl[i].modename; i++) {
4566                 if (mode == tbl[i].mode)
4567                         return tbl[i].mode;
4568                 if (strcmp(modestr, tbl[i].modename) == 0)
4569                         return tbl[i].mode;
4570         }
4571
4572         return -1;
4573 }
4574
4575 static int bond_check_params(struct bond_params *params)
4576 {
4577         int arp_validate_value;
4578
4579         /*
4580          * Convert string parameters.
4581          */
4582         if (mode) {
4583                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4584                 if (bond_mode == -1) {
4585                         printk(KERN_ERR DRV_NAME
4586                                ": Error: Invalid bonding mode \"%s\"\n",
4587                                mode == NULL ? "NULL" : mode);
4588                         return -EINVAL;
4589                 }
4590         }
4591
4592         if (xmit_hash_policy) {
4593                 if ((bond_mode != BOND_MODE_XOR) &&
4594                     (bond_mode != BOND_MODE_8023AD)) {
4595                         printk(KERN_INFO DRV_NAME
4596                                ": xor_mode param is irrelevant in mode %s\n",
4597                                bond_mode_name(bond_mode));
4598                 } else {
4599                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4600                                                         xmit_hashtype_tbl);
4601                         if (xmit_hashtype == -1) {
4602                                 printk(KERN_ERR DRV_NAME
4603                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4604                                 xmit_hash_policy == NULL ? "NULL" :
4605                                        xmit_hash_policy);
4606                                 return -EINVAL;
4607                         }
4608                 }
4609         }
4610
4611         if (lacp_rate) {
4612                 if (bond_mode != BOND_MODE_8023AD) {
4613                         printk(KERN_INFO DRV_NAME
4614                                ": lacp_rate param is irrelevant in mode %s\n",
4615                                bond_mode_name(bond_mode));
4616                 } else {
4617                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4618                         if (lacp_fast == -1) {
4619                                 printk(KERN_ERR DRV_NAME
4620                                        ": Error: Invalid lacp rate \"%s\"\n",
4621                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4622                                 return -EINVAL;
4623                         }
4624                 }
4625         }
4626
4627         if (max_bonds < 1 || max_bonds > INT_MAX) {
4628                 printk(KERN_WARNING DRV_NAME
4629                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4630                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4631                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4632                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4633         }
4634
4635         if (miimon < 0) {
4636                 printk(KERN_WARNING DRV_NAME
4637                        ": Warning: miimon module parameter (%d), "
4638                        "not in range 0-%d, so it was reset to %d\n",
4639                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4640                 miimon = BOND_LINK_MON_INTERV;
4641         }
4642
4643         if (updelay < 0) {
4644                 printk(KERN_WARNING DRV_NAME
4645                        ": Warning: updelay module parameter (%d), "
4646                        "not in range 0-%d, so it was reset to 0\n",
4647                        updelay, INT_MAX);
4648                 updelay = 0;
4649         }
4650
4651         if (downdelay < 0) {
4652                 printk(KERN_WARNING DRV_NAME
4653                        ": Warning: downdelay module parameter (%d), "
4654                        "not in range 0-%d, so it was reset to 0\n",
4655                        downdelay, INT_MAX);
4656                 downdelay = 0;
4657         }
4658
4659         if ((use_carrier != 0) && (use_carrier != 1)) {
4660                 printk(KERN_WARNING DRV_NAME
4661                        ": Warning: use_carrier module parameter (%d), "
4662                        "not of valid value (0/1), so it was set to 1\n",
4663                        use_carrier);
4664                 use_carrier = 1;
4665         }
4666
4667         /* reset values for 802.3ad */
4668         if (bond_mode == BOND_MODE_8023AD) {
4669                 if (!miimon) {
4670                         printk(KERN_WARNING DRV_NAME
4671                                ": Warning: miimon must be specified, "
4672                                "otherwise bonding will not detect link "
4673                                "failure, speed and duplex which are "
4674                                "essential for 802.3ad operation\n");
4675                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4676                         miimon = 100;
4677                 }
4678         }
4679
4680         /* reset values for TLB/ALB */
4681         if ((bond_mode == BOND_MODE_TLB) ||
4682             (bond_mode == BOND_MODE_ALB)) {
4683                 if (!miimon) {
4684                         printk(KERN_WARNING DRV_NAME
4685                                ": Warning: miimon must be specified, "
4686                                "otherwise bonding will not detect link "
4687                                "failure and link speed which are essential "
4688                                "for TLB/ALB load balancing\n");
4689                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4690                         miimon = 100;
4691                 }
4692         }
4693
4694         if (bond_mode == BOND_MODE_ALB) {
4695                 printk(KERN_NOTICE DRV_NAME
4696                        ": In ALB mode you might experience client "
4697                        "disconnections upon reconnection of a link if the "
4698                        "bonding module updelay parameter (%d msec) is "
4699                        "incompatible with the forwarding delay time of the "
4700                        "switch\n",
4701                        updelay);
4702         }
4703
4704         if (!miimon) {
4705                 if (updelay || downdelay) {
4706                         /* just warn the user the up/down delay will have
4707                          * no effect since miimon is zero...
4708                          */
4709                         printk(KERN_WARNING DRV_NAME
4710                                ": Warning: miimon module parameter not set "
4711                                "and updelay (%d) or downdelay (%d) module "
4712                                "parameter is set; updelay and downdelay have "
4713                                "no effect unless miimon is set\n",
4714                                updelay, downdelay);
4715                 }
4716         } else {
4717                 /* don't allow arp monitoring */
4718                 if (arp_interval) {
4719                         printk(KERN_WARNING DRV_NAME
4720                                ": Warning: miimon (%d) and arp_interval (%d) "
4721                                "can't be used simultaneously, disabling ARP "
4722                                "monitoring\n",
4723                                miimon, arp_interval);
4724                         arp_interval = 0;
4725                 }
4726
4727                 if ((updelay % miimon) != 0) {
4728                         printk(KERN_WARNING DRV_NAME
4729                                ": Warning: updelay (%d) is not a multiple "
4730                                "of miimon (%d), updelay rounded to %d ms\n",
4731                                updelay, miimon, (updelay / miimon) * miimon);
4732                 }
4733
4734                 updelay /= miimon;
4735
4736                 if ((downdelay % miimon) != 0) {
4737                         printk(KERN_WARNING DRV_NAME
4738                                ": Warning: downdelay (%d) is not a multiple "
4739                                "of miimon (%d), downdelay rounded to %d ms\n",
4740                                downdelay, miimon,
4741                                (downdelay / miimon) * miimon);
4742                 }
4743
4744                 downdelay /= miimon;
4745         }
4746
4747         if (arp_interval < 0) {
4748                 printk(KERN_WARNING DRV_NAME
4749                        ": Warning: arp_interval module parameter (%d) "
4750                        ", not in range 0-%d, so it was reset to %d\n",
4751                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4752                 arp_interval = BOND_LINK_ARP_INTERV;
4753         }
4754
4755         for (arp_ip_count = 0;
4756              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4757              arp_ip_count++) {
4758                 /* not complete check, but should be good enough to
4759                    catch mistakes */
4760                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4761                         printk(KERN_WARNING DRV_NAME
4762                                ": Warning: bad arp_ip_target module parameter "
4763                                "(%s), ARP monitoring will not be performed\n",
4764                                arp_ip_target[arp_ip_count]);
4765                         arp_interval = 0;
4766                 } else {
4767                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4768                         arp_target[arp_ip_count] = ip;
4769                 }
4770         }
4771
4772         if (arp_interval && !arp_ip_count) {
4773                 /* don't allow arping if no arp_ip_target given... */
4774                 printk(KERN_WARNING DRV_NAME
4775                        ": Warning: arp_interval module parameter (%d) "
4776                        "specified without providing an arp_ip_target "
4777                        "parameter, arp_interval was reset to 0\n",
4778                        arp_interval);
4779                 arp_interval = 0;
4780         }
4781
4782         if (arp_validate) {
4783                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4784                         printk(KERN_ERR DRV_NAME
4785                ": arp_validate only supported in active-backup mode\n");
4786                         return -EINVAL;
4787                 }
4788                 if (!arp_interval) {
4789                         printk(KERN_ERR DRV_NAME
4790                                ": arp_validate requires arp_interval\n");
4791                         return -EINVAL;
4792                 }
4793
4794                 arp_validate_value = bond_parse_parm(arp_validate,
4795                                                      arp_validate_tbl);
4796                 if (arp_validate_value == -1) {
4797                         printk(KERN_ERR DRV_NAME
4798                                ": Error: invalid arp_validate \"%s\"\n",
4799                                arp_validate == NULL ? "NULL" : arp_validate);
4800                         return -EINVAL;
4801                 }
4802         } else
4803                 arp_validate_value = 0;
4804
4805         if (miimon) {
4806                 printk(KERN_INFO DRV_NAME
4807                        ": MII link monitoring set to %d ms\n",
4808                        miimon);
4809         } else if (arp_interval) {
4810                 int i;
4811
4812                 printk(KERN_INFO DRV_NAME
4813                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4814                        arp_interval,
4815                        arp_validate_tbl[arp_validate_value].modename,
4816                        arp_ip_count);
4817
4818                 for (i = 0; i < arp_ip_count; i++)
4819                         printk (" %s", arp_ip_target[i]);
4820
4821                 printk("\n");
4822
4823         } else {
4824                 /* miimon and arp_interval not set, we need one so things
4825                  * work as expected, see bonding.txt for details
4826                  */
4827                 printk(KERN_WARNING DRV_NAME
4828                        ": Warning: either miimon or arp_interval and "
4829                        "arp_ip_target module parameters must be specified, "
4830                        "otherwise bonding will not detect link failures! see "
4831                        "bonding.txt for details.\n");
4832         }
4833
4834         if (primary && !USES_PRIMARY(bond_mode)) {
4835                 /* currently, using a primary only makes sense
4836                  * in active backup, TLB or ALB modes
4837                  */
4838                 printk(KERN_WARNING DRV_NAME
4839                        ": Warning: %s primary device specified but has no "
4840                        "effect in %s mode\n",
4841                        primary, bond_mode_name(bond_mode));
4842                 primary = NULL;
4843         }
4844
4845         if (fail_over_mac && (bond_mode != BOND_MODE_ACTIVEBACKUP))
4846                 printk(KERN_WARNING DRV_NAME
4847                        ": Warning: fail_over_mac only affects "
4848                        "active-backup mode.\n");
4849
4850         /* fill params struct with the proper values */
4851         params->mode = bond_mode;
4852         params->xmit_policy = xmit_hashtype;
4853         params->miimon = miimon;
4854         params->arp_interval = arp_interval;
4855         params->arp_validate = arp_validate_value;
4856         params->updelay = updelay;
4857         params->downdelay = downdelay;
4858         params->use_carrier = use_carrier;
4859         params->lacp_fast = lacp_fast;
4860         params->primary[0] = 0;
4861         params->fail_over_mac = fail_over_mac;
4862
4863         if (primary) {
4864                 strncpy(params->primary, primary, IFNAMSIZ);
4865                 params->primary[IFNAMSIZ - 1] = 0;
4866         }
4867
4868         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4869
4870         return 0;
4871 }
4872
4873 static struct lock_class_key bonding_netdev_xmit_lock_key;
4874
4875 /* Create a new bond based on the specified name and bonding parameters.
4876  * If name is NULL, obtain a suitable "bond%d" name for us.
4877  * Caller must NOT hold rtnl_lock; we need to release it here before we
4878  * set up our sysfs entries.
4879  */
4880 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4881 {
4882         struct net_device *bond_dev;
4883         struct bonding *bond, *nxt;
4884         int res;
4885
4886         rtnl_lock();
4887         down_write(&bonding_rwsem);
4888
4889         /* Check to see if the bond already exists. */
4890         if (name) {
4891                 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
4892                         if (strnicmp(bond->dev->name, name, IFNAMSIZ) == 0) {
4893                                 printk(KERN_ERR DRV_NAME
4894                                ": cannot add bond %s; it already exists\n",
4895                                        name);
4896                                 res = -EPERM;
4897                                 goto out_rtnl;
4898                         }
4899         }
4900
4901         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4902                                 ether_setup);
4903         if (!bond_dev) {
4904                 printk(KERN_ERR DRV_NAME
4905                        ": %s: eek! can't alloc netdev!\n",
4906                        name);
4907                 res = -ENOMEM;
4908                 goto out_rtnl;
4909         }
4910
4911         if (!name) {
4912                 res = dev_alloc_name(bond_dev, "bond%d");
4913                 if (res < 0)
4914                         goto out_netdev;
4915         }
4916
4917         /* bond_init() must be called after dev_alloc_name() (for the
4918          * /proc files), but before register_netdevice(), because we
4919          * need to set function pointers.
4920          */
4921
4922         res = bond_init(bond_dev, params);
4923         if (res < 0) {
4924                 goto out_netdev;
4925         }
4926
4927         res = register_netdevice(bond_dev);
4928         if (res < 0) {
4929                 goto out_bond;
4930         }
4931
4932         lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4933
4934         if (newbond)
4935                 *newbond = bond_dev->priv;
4936
4937         netif_carrier_off(bond_dev);
4938
4939         up_write(&bonding_rwsem);
4940         rtnl_unlock(); /* allows sysfs registration of net device */
4941         res = bond_create_sysfs_entry(bond_dev->priv);
4942         if (res < 0) {
4943                 rtnl_lock();
4944                 down_write(&bonding_rwsem);
4945                 goto out_bond;
4946         }
4947
4948         return 0;
4949
4950 out_bond:
4951         bond_deinit(bond_dev);
4952 out_netdev:
4953         free_netdev(bond_dev);
4954 out_rtnl:
4955         up_write(&bonding_rwsem);
4956         rtnl_unlock();
4957         return res;
4958 }
4959
4960 static int __init bonding_init(void)
4961 {
4962         int i;
4963         int res;
4964         struct bonding *bond, *nxt;
4965
4966         printk(KERN_INFO "%s", version);
4967
4968         res = bond_check_params(&bonding_defaults);
4969         if (res) {
4970                 goto out;
4971         }
4972
4973 #ifdef CONFIG_PROC_FS
4974         bond_create_proc_dir();
4975 #endif
4976
4977         init_rwsem(&bonding_rwsem);
4978
4979         for (i = 0; i < max_bonds; i++) {
4980                 res = bond_create(NULL, &bonding_defaults, NULL);
4981                 if (res)
4982                         goto err;
4983         }
4984
4985         res = bond_create_sysfs();
4986         if (res)
4987                 goto err;
4988
4989         register_netdevice_notifier(&bond_netdev_notifier);
4990         register_inetaddr_notifier(&bond_inetaddr_notifier);
4991
4992         goto out;
4993 err:
4994         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4995                 bond_work_cancel_all(bond);
4996                 destroy_workqueue(bond->wq);
4997         }
4998
4999         rtnl_lock();
5000         bond_free_all();
5001         bond_destroy_sysfs();
5002         rtnl_unlock();
5003 out:
5004         return res;
5005
5006 }
5007
5008 static void __exit bonding_exit(void)
5009 {
5010         unregister_netdevice_notifier(&bond_netdev_notifier);
5011         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5012
5013         rtnl_lock();
5014         bond_free_all();
5015         bond_destroy_sysfs();
5016         rtnl_unlock();
5017 }
5018
5019 module_init(bonding_init);
5020 module_exit(bonding_exit);
5021 MODULE_LICENSE("GPL");
5022 MODULE_VERSION(DRV_VERSION);
5023 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5024 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5025 MODULE_SUPPORTED_DEVICE("most ethernet devices");
5026
5027 /*
5028  * Local variables:
5029  *  c-indent-level: 8
5030  *  c-basic-offset: 8
5031  *  tab-width: 8
5032  * End:
5033  */
5034