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 uninitialized_var(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_restore_mac;
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_unset_master;
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_close;
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_close;
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_close:
1635         dev_close(slave_dev);
1636
1637 err_unset_master:
1638         netdev_set_master(slave_dev, NULL);
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 = msecs_to_jiffies(bond->params.miimon);
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_this_ip(struct bonding *bond, __be32 ip)
2430 {
2431         struct vlan_entry *vlan, *vlan_next;
2432
2433         if (ip == 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 (ip == vlan->vlan_ip)
2442                         return 1;
2443         }
2444
2445         return 0;
2446 }
2447
2448 /*
2449  * We go to the (large) trouble of VLAN tagging ARP frames because
2450  * switches in VLAN mode (especially if ports are configured as
2451  * "native" to a VLAN) might not pass non-tagged frames.
2452  */
2453 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2454 {
2455         struct sk_buff *skb;
2456
2457         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2458                slave_dev->name, dest_ip, src_ip, vlan_id);
2459
2460         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2461                          NULL, slave_dev->dev_addr, NULL);
2462
2463         if (!skb) {
2464                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2465                 return;
2466         }
2467         if (vlan_id) {
2468                 skb = vlan_put_tag(skb, vlan_id);
2469                 if (!skb) {
2470                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2471                         return;
2472                 }
2473         }
2474         arp_xmit(skb);
2475 }
2476
2477
2478 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2479 {
2480         int i, vlan_id, rv;
2481         __be32 *targets = bond->params.arp_targets;
2482         struct vlan_entry *vlan, *vlan_next;
2483         struct net_device *vlan_dev;
2484         struct flowi fl;
2485         struct rtable *rt;
2486
2487         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2488                 if (!targets[i])
2489                         continue;
2490                 dprintk("basa: target %x\n", targets[i]);
2491                 if (list_empty(&bond->vlan_list)) {
2492                         dprintk("basa: empty vlan: arp_send\n");
2493                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2494                                       bond->master_ip, 0);
2495                         continue;
2496                 }
2497
2498                 /*
2499                  * If VLANs are configured, we do a route lookup to
2500                  * determine which VLAN interface would be used, so we
2501                  * can tag the ARP with the proper VLAN tag.
2502                  */
2503                 memset(&fl, 0, sizeof(fl));
2504                 fl.fl4_dst = targets[i];
2505                 fl.fl4_tos = RTO_ONLINK;
2506
2507                 rv = ip_route_output_key(&init_net, &rt, &fl);
2508                 if (rv) {
2509                         if (net_ratelimit()) {
2510                                 printk(KERN_WARNING DRV_NAME
2511                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2512                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2513                         }
2514                         continue;
2515                 }
2516
2517                 /*
2518                  * This target is not on a VLAN
2519                  */
2520                 if (rt->u.dst.dev == bond->dev) {
2521                         ip_rt_put(rt);
2522                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2523                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2524                                       bond->master_ip, 0);
2525                         continue;
2526                 }
2527
2528                 vlan_id = 0;
2529                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2530                                          vlan_list) {
2531                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2532                         if (vlan_dev == rt->u.dst.dev) {
2533                                 vlan_id = vlan->vlan_id;
2534                                 dprintk("basa: vlan match on %s %d\n",
2535                                        vlan_dev->name, vlan_id);
2536                                 break;
2537                         }
2538                 }
2539
2540                 if (vlan_id) {
2541                         ip_rt_put(rt);
2542                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2543                                       vlan->vlan_ip, vlan_id);
2544                         continue;
2545                 }
2546
2547                 if (net_ratelimit()) {
2548                         printk(KERN_WARNING DRV_NAME
2549                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2550                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2551                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2552                 }
2553                 ip_rt_put(rt);
2554         }
2555 }
2556
2557 /*
2558  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2559  * for each VLAN above us.
2560  */
2561 static void bond_send_gratuitous_arp(struct bonding *bond)
2562 {
2563         struct slave *slave = bond->curr_active_slave;
2564         struct vlan_entry *vlan;
2565         struct net_device *vlan_dev;
2566
2567         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2568                                 slave ? slave->dev->name : "NULL");
2569         if (!slave)
2570                 return;
2571
2572         if (bond->master_ip) {
2573                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2574                                 bond->master_ip, 0);
2575         }
2576
2577         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2578                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2579                 if (vlan->vlan_ip) {
2580                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2581                                       vlan->vlan_ip, vlan->vlan_id);
2582                 }
2583         }
2584 }
2585
2586 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2587 {
2588         int i;
2589         __be32 *targets = bond->params.arp_targets;
2590
2591         targets = bond->params.arp_targets;
2592         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2593                 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2594                         "%u.%u.%u.%u bhti(tip) %d\n",
2595                        NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2596                        bond_has_this_ip(bond, tip));
2597                 if (sip == targets[i]) {
2598                         if (bond_has_this_ip(bond, tip))
2599                                 slave->last_arp_rx = jiffies;
2600                         return;
2601                 }
2602         }
2603 }
2604
2605 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2606 {
2607         struct arphdr *arp;
2608         struct slave *slave;
2609         struct bonding *bond;
2610         unsigned char *arp_ptr;
2611         __be32 sip, tip;
2612
2613         if (dev_net(dev) != &init_net)
2614                 goto out;
2615
2616         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2617                 goto out;
2618
2619         bond = dev->priv;
2620         read_lock(&bond->lock);
2621
2622         dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2623                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2624                 orig_dev ? orig_dev->name : "NULL");
2625
2626         slave = bond_get_slave_by_dev(bond, orig_dev);
2627         if (!slave || !slave_do_arp_validate(bond, slave))
2628                 goto out_unlock;
2629
2630         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2631                 goto out_unlock;
2632
2633         arp = arp_hdr(skb);
2634         if (arp->ar_hln != dev->addr_len ||
2635             skb->pkt_type == PACKET_OTHERHOST ||
2636             skb->pkt_type == PACKET_LOOPBACK ||
2637             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2638             arp->ar_pro != htons(ETH_P_IP) ||
2639             arp->ar_pln != 4)
2640                 goto out_unlock;
2641
2642         arp_ptr = (unsigned char *)(arp + 1);
2643         arp_ptr += dev->addr_len;
2644         memcpy(&sip, arp_ptr, 4);
2645         arp_ptr += 4 + dev->addr_len;
2646         memcpy(&tip, arp_ptr, 4);
2647
2648         dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2649                 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2650                 slave->state, bond->params.arp_validate,
2651                 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2652
2653         /*
2654          * Backup slaves won't see the ARP reply, but do come through
2655          * here for each ARP probe (so we swap the sip/tip to validate
2656          * the probe).  In a "redundant switch, common router" type of
2657          * configuration, the ARP probe will (hopefully) travel from
2658          * the active, through one switch, the router, then the other
2659          * switch before reaching the backup.
2660          */
2661         if (slave->state == BOND_STATE_ACTIVE)
2662                 bond_validate_arp(bond, slave, sip, tip);
2663         else
2664                 bond_validate_arp(bond, slave, tip, sip);
2665
2666 out_unlock:
2667         read_unlock(&bond->lock);
2668 out:
2669         dev_kfree_skb(skb);
2670         return NET_RX_SUCCESS;
2671 }
2672
2673 /*
2674  * this function is called regularly to monitor each slave's link
2675  * ensuring that traffic is being sent and received when arp monitoring
2676  * is used in load-balancing mode. if the adapter has been dormant, then an
2677  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2678  * arp monitoring in active backup mode.
2679  */
2680 void bond_loadbalance_arp_mon(struct work_struct *work)
2681 {
2682         struct bonding *bond = container_of(work, struct bonding,
2683                                             arp_work.work);
2684         struct slave *slave, *oldcurrent;
2685         int do_failover = 0;
2686         int delta_in_ticks;
2687         int i;
2688
2689         read_lock(&bond->lock);
2690
2691         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2692
2693         if (bond->kill_timers) {
2694                 goto out;
2695         }
2696
2697         if (bond->slave_cnt == 0) {
2698                 goto re_arm;
2699         }
2700
2701         read_lock(&bond->curr_slave_lock);
2702         oldcurrent = bond->curr_active_slave;
2703         read_unlock(&bond->curr_slave_lock);
2704
2705         /* see if any of the previous devices are up now (i.e. they have
2706          * xmt and rcv traffic). the curr_active_slave does not come into
2707          * the picture unless it is null. also, slave->jiffies is not needed
2708          * here because we send an arp on each slave and give a slave as
2709          * long as it needs to get the tx/rx within the delta.
2710          * TODO: what about up/down delay in arp mode? it wasn't here before
2711          *       so it can wait
2712          */
2713         bond_for_each_slave(bond, slave, i) {
2714                 if (slave->link != BOND_LINK_UP) {
2715                         if (time_before_eq(jiffies, slave->dev->trans_start + delta_in_ticks) &&
2716                             time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
2717
2718                                 slave->link  = BOND_LINK_UP;
2719                                 slave->state = BOND_STATE_ACTIVE;
2720
2721                                 /* primary_slave has no meaning in round-robin
2722                                  * mode. the window of a slave being up and
2723                                  * curr_active_slave being null after enslaving
2724                                  * is closed.
2725                                  */
2726                                 if (!oldcurrent) {
2727                                         printk(KERN_INFO DRV_NAME
2728                                                ": %s: link status definitely "
2729                                                "up for interface %s, ",
2730                                                bond->dev->name,
2731                                                slave->dev->name);
2732                                         do_failover = 1;
2733                                 } else {
2734                                         printk(KERN_INFO DRV_NAME
2735                                                ": %s: interface %s is now up\n",
2736                                                bond->dev->name,
2737                                                slave->dev->name);
2738                                 }
2739                         }
2740                 } else {
2741                         /* slave->link == BOND_LINK_UP */
2742
2743                         /* not all switches will respond to an arp request
2744                          * when the source ip is 0, so don't take the link down
2745                          * if we don't know our ip yet
2746                          */
2747                         if (time_after_eq(jiffies, slave->dev->trans_start + 2*delta_in_ticks) ||
2748                             (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks))) {
2749
2750                                 slave->link  = BOND_LINK_DOWN;
2751                                 slave->state = BOND_STATE_BACKUP;
2752
2753                                 if (slave->link_failure_count < UINT_MAX) {
2754                                         slave->link_failure_count++;
2755                                 }
2756
2757                                 printk(KERN_INFO DRV_NAME
2758                                        ": %s: interface %s is now down.\n",
2759                                        bond->dev->name,
2760                                        slave->dev->name);
2761
2762                                 if (slave == oldcurrent) {
2763                                         do_failover = 1;
2764                                 }
2765                         }
2766                 }
2767
2768                 /* note: if switch is in round-robin mode, all links
2769                  * must tx arp to ensure all links rx an arp - otherwise
2770                  * links may oscillate or not come up at all; if switch is
2771                  * in something like xor mode, there is nothing we can
2772                  * do - all replies will be rx'ed on same link causing slaves
2773                  * to be unstable during low/no traffic periods
2774                  */
2775                 if (IS_UP(slave->dev)) {
2776                         bond_arp_send_all(bond, slave);
2777                 }
2778         }
2779
2780         if (do_failover) {
2781                 write_lock_bh(&bond->curr_slave_lock);
2782
2783                 bond_select_active_slave(bond);
2784
2785                 write_unlock_bh(&bond->curr_slave_lock);
2786         }
2787
2788 re_arm:
2789         if (bond->params.arp_interval)
2790                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2791 out:
2792         read_unlock(&bond->lock);
2793 }
2794
2795 /*
2796  * When using arp monitoring in active-backup mode, this function is
2797  * called to determine if any backup slaves have went down or a new
2798  * current slave needs to be found.
2799  * The backup slaves never generate traffic, they are considered up by merely
2800  * receiving traffic. If the current slave goes down, each backup slave will
2801  * be given the opportunity to tx/rx an arp before being taken down - this
2802  * prevents all slaves from being taken down due to the current slave not
2803  * sending any traffic for the backups to receive. The arps are not necessarily
2804  * necessary, any tx and rx traffic will keep the current slave up. While any
2805  * rx traffic will keep the backup slaves up, the current slave is responsible
2806  * for generating traffic to keep them up regardless of any other traffic they
2807  * may have received.
2808  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2809  */
2810 void bond_activebackup_arp_mon(struct work_struct *work)
2811 {
2812         struct bonding *bond = container_of(work, struct bonding,
2813                                             arp_work.work);
2814         struct slave *slave;
2815         int delta_in_ticks;
2816         int i;
2817
2818         read_lock(&bond->lock);
2819
2820         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2821
2822         if (bond->kill_timers) {
2823                 goto out;
2824         }
2825
2826         if (bond->slave_cnt == 0) {
2827                 goto re_arm;
2828         }
2829
2830         /* determine if any slave has come up or any backup slave has
2831          * gone down
2832          * TODO: what about up/down delay in arp mode? it wasn't here before
2833          *       so it can wait
2834          */
2835         bond_for_each_slave(bond, slave, i) {
2836                 if (slave->link != BOND_LINK_UP) {
2837                         if (time_before_eq(jiffies,
2838                             slave_last_rx(bond, slave) + delta_in_ticks)) {
2839
2840                                 slave->link = BOND_LINK_UP;
2841
2842                                 write_lock_bh(&bond->curr_slave_lock);
2843
2844                                 if ((!bond->curr_active_slave) &&
2845                                     time_before_eq(jiffies, slave->dev->trans_start + delta_in_ticks)) {
2846                                         bond_change_active_slave(bond, slave);
2847                                         bond->current_arp_slave = NULL;
2848                                 } else if (bond->curr_active_slave != slave) {
2849                                         /* this slave has just come up but we
2850                                          * already have a current slave; this
2851                                          * can also happen if bond_enslave adds
2852                                          * a new slave that is up while we are
2853                                          * searching for a new slave
2854                                          */
2855                                         bond_set_slave_inactive_flags(slave);
2856                                         bond->current_arp_slave = NULL;
2857                                 }
2858
2859                                 bond_set_carrier(bond);
2860
2861                                 if (slave == bond->curr_active_slave) {
2862                                         printk(KERN_INFO DRV_NAME
2863                                                ": %s: %s is up and now the "
2864                                                "active interface\n",
2865                                                bond->dev->name,
2866                                                slave->dev->name);
2867                                         netif_carrier_on(bond->dev);
2868                                 } else {
2869                                         printk(KERN_INFO DRV_NAME
2870                                                ": %s: backup interface %s is "
2871                                                "now up\n",
2872                                                bond->dev->name,
2873                                                slave->dev->name);
2874                                 }
2875
2876                                 write_unlock_bh(&bond->curr_slave_lock);
2877                         }
2878                 } else {
2879                         read_lock(&bond->curr_slave_lock);
2880
2881                         if ((slave != bond->curr_active_slave) &&
2882                             (!bond->current_arp_slave) &&
2883                             (time_after_eq(jiffies, slave_last_rx(bond, slave) + 3*delta_in_ticks))) {
2884                                 /* a backup slave has gone down; three times
2885                                  * the delta allows the current slave to be
2886                                  * taken out before the backup slave.
2887                                  * note: a non-null current_arp_slave indicates
2888                                  * the curr_active_slave went down and we are
2889                                  * searching for a new one; under this
2890                                  * condition we only take the curr_active_slave
2891                                  * down - this gives each slave a chance to
2892                                  * tx/rx traffic before being taken out
2893                                  */
2894
2895                                 read_unlock(&bond->curr_slave_lock);
2896
2897                                 slave->link  = BOND_LINK_DOWN;
2898
2899                                 if (slave->link_failure_count < UINT_MAX) {
2900                                         slave->link_failure_count++;
2901                                 }
2902
2903                                 bond_set_slave_inactive_flags(slave);
2904
2905                                 printk(KERN_INFO DRV_NAME
2906                                        ": %s: backup interface %s is now down\n",
2907                                        bond->dev->name,
2908                                        slave->dev->name);
2909                         } else {
2910                                 read_unlock(&bond->curr_slave_lock);
2911                         }
2912                 }
2913         }
2914
2915         read_lock(&bond->curr_slave_lock);
2916         slave = bond->curr_active_slave;
2917         read_unlock(&bond->curr_slave_lock);
2918
2919         if (slave) {
2920                 /* if we have sent traffic in the past 2*arp_intervals but
2921                  * haven't xmit and rx traffic in that time interval, select
2922                  * a different slave. slave->jiffies is only updated when
2923                  * a slave first becomes the curr_active_slave - not necessarily
2924                  * after every arp; this ensures the slave has a full 2*delta
2925                  * before being taken out. if a primary is being used, check
2926                  * if it is up and needs to take over as the curr_active_slave
2927                  */
2928                 if ((time_after_eq(jiffies, slave->dev->trans_start + 2*delta_in_ticks) ||
2929                      (time_after_eq(jiffies, slave_last_rx(bond, slave) + 2*delta_in_ticks))) &&
2930                         time_after_eq(jiffies, slave->jiffies + 2*delta_in_ticks)) {
2931
2932                         slave->link  = BOND_LINK_DOWN;
2933
2934                         if (slave->link_failure_count < UINT_MAX) {
2935                                 slave->link_failure_count++;
2936                         }
2937
2938                         printk(KERN_INFO DRV_NAME
2939                                ": %s: link status down for active interface "
2940                                "%s, disabling it\n",
2941                                bond->dev->name,
2942                                slave->dev->name);
2943
2944                         write_lock_bh(&bond->curr_slave_lock);
2945
2946                         bond_select_active_slave(bond);
2947                         slave = bond->curr_active_slave;
2948
2949                         write_unlock_bh(&bond->curr_slave_lock);
2950
2951                         bond->current_arp_slave = slave;
2952
2953                         if (slave) {
2954                                 slave->jiffies = jiffies;
2955                         }
2956                 } else if ((bond->primary_slave) &&
2957                            (bond->primary_slave != slave) &&
2958                            (bond->primary_slave->link == BOND_LINK_UP)) {
2959                         /* at this point, slave is the curr_active_slave */
2960                         printk(KERN_INFO DRV_NAME
2961                                ": %s: changing from interface %s to primary "
2962                                "interface %s\n",
2963                                bond->dev->name,
2964                                slave->dev->name,
2965                                bond->primary_slave->dev->name);
2966
2967                         /* primary is up so switch to it */
2968                         write_lock_bh(&bond->curr_slave_lock);
2969                         bond_change_active_slave(bond, bond->primary_slave);
2970                         write_unlock_bh(&bond->curr_slave_lock);
2971
2972                         slave = bond->primary_slave;
2973                         slave->jiffies = jiffies;
2974                 } else {
2975                         bond->current_arp_slave = NULL;
2976                 }
2977
2978                 /* the current slave must tx an arp to ensure backup slaves
2979                  * rx traffic
2980                  */
2981                 if (slave && IS_UP(slave->dev))
2982                         bond_arp_send_all(bond, slave);
2983         }
2984
2985         /* if we don't have a curr_active_slave, search for the next available
2986          * backup slave from the current_arp_slave and make it the candidate
2987          * for becoming the curr_active_slave
2988          */
2989         if (!slave) {
2990                 if (!bond->current_arp_slave) {
2991                         bond->current_arp_slave = bond->first_slave;
2992                 }
2993
2994                 if (bond->current_arp_slave) {
2995                         bond_set_slave_inactive_flags(bond->current_arp_slave);
2996
2997                         /* search for next candidate */
2998                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2999                                 if (IS_UP(slave->dev)) {
3000                                         slave->link = BOND_LINK_BACK;
3001                                         bond_set_slave_active_flags(slave);
3002                                         bond_arp_send_all(bond, slave);
3003                                         slave->jiffies = jiffies;
3004                                         bond->current_arp_slave = slave;
3005                                         break;
3006                                 }
3007
3008                                 /* if the link state is up at this point, we
3009                                  * mark it down - this can happen if we have
3010                                  * simultaneous link failures and
3011                                  * reselect_active_interface doesn't make this
3012                                  * one the current slave so it is still marked
3013                                  * up when it is actually down
3014                                  */
3015                                 if (slave->link == BOND_LINK_UP) {
3016                                         slave->link  = BOND_LINK_DOWN;
3017                                         if (slave->link_failure_count < UINT_MAX) {
3018                                                 slave->link_failure_count++;
3019                                         }
3020
3021                                         bond_set_slave_inactive_flags(slave);
3022
3023                                         printk(KERN_INFO DRV_NAME
3024                                                ": %s: backup interface %s is "
3025                                                "now down.\n",
3026                                                bond->dev->name,
3027                                                slave->dev->name);
3028                                 }
3029                         }
3030                 }
3031         }
3032
3033 re_arm:
3034         if (bond->params.arp_interval) {
3035                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3036         }
3037 out:
3038         read_unlock(&bond->lock);
3039 }
3040
3041 /*------------------------------ proc/seq_file-------------------------------*/
3042
3043 #ifdef CONFIG_PROC_FS
3044
3045 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3046 {
3047         struct bonding *bond = seq->private;
3048         loff_t off = 0;
3049         struct slave *slave;
3050         int i;
3051
3052         /* make sure the bond won't be taken away */
3053         read_lock(&dev_base_lock);
3054         read_lock(&bond->lock);
3055
3056         if (*pos == 0) {
3057                 return SEQ_START_TOKEN;
3058         }
3059
3060         bond_for_each_slave(bond, slave, i) {
3061                 if (++off == *pos) {
3062                         return slave;
3063                 }
3064         }
3065
3066         return NULL;
3067 }
3068
3069 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3070 {
3071         struct bonding *bond = seq->private;
3072         struct slave *slave = v;
3073
3074         ++*pos;
3075         if (v == SEQ_START_TOKEN) {
3076                 return bond->first_slave;
3077         }
3078
3079         slave = slave->next;
3080
3081         return (slave == bond->first_slave) ? NULL : slave;
3082 }
3083
3084 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3085 {
3086         struct bonding *bond = seq->private;
3087
3088         read_unlock(&bond->lock);
3089         read_unlock(&dev_base_lock);
3090 }
3091
3092 static void bond_info_show_master(struct seq_file *seq)
3093 {
3094         struct bonding *bond = seq->private;
3095         struct slave *curr;
3096         int i;
3097         u32 target;
3098
3099         read_lock(&bond->curr_slave_lock);
3100         curr = bond->curr_active_slave;
3101         read_unlock(&bond->curr_slave_lock);
3102
3103         seq_printf(seq, "Bonding Mode: %s",
3104                    bond_mode_name(bond->params.mode));
3105
3106         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3107             bond->params.fail_over_mac)
3108                 seq_printf(seq, " (fail_over_mac)");
3109
3110         seq_printf(seq, "\n");
3111
3112         if (bond->params.mode == BOND_MODE_XOR ||
3113                 bond->params.mode == BOND_MODE_8023AD) {
3114                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3115                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3116                         bond->params.xmit_policy);
3117         }
3118
3119         if (USES_PRIMARY(bond->params.mode)) {
3120                 seq_printf(seq, "Primary Slave: %s\n",
3121                            (bond->primary_slave) ?
3122                            bond->primary_slave->dev->name : "None");
3123
3124                 seq_printf(seq, "Currently Active Slave: %s\n",
3125                            (curr) ? curr->dev->name : "None");
3126         }
3127
3128         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3129                    "up" : "down");
3130         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3131         seq_printf(seq, "Up Delay (ms): %d\n",
3132                    bond->params.updelay * bond->params.miimon);
3133         seq_printf(seq, "Down Delay (ms): %d\n",
3134                    bond->params.downdelay * bond->params.miimon);
3135
3136
3137         /* ARP information */
3138         if(bond->params.arp_interval > 0) {
3139                 int printed=0;
3140                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3141                                 bond->params.arp_interval);
3142
3143                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3144
3145                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3146                         if (!bond->params.arp_targets[i])
3147                                 continue;
3148                         if (printed)
3149                                 seq_printf(seq, ",");
3150                         target = ntohl(bond->params.arp_targets[i]);
3151                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
3152                         printed = 1;
3153                 }
3154                 seq_printf(seq, "\n");
3155         }
3156
3157         if (bond->params.mode == BOND_MODE_8023AD) {
3158                 struct ad_info ad_info;
3159                 DECLARE_MAC_BUF(mac);
3160
3161                 seq_puts(seq, "\n802.3ad info\n");
3162                 seq_printf(seq, "LACP rate: %s\n",
3163                            (bond->params.lacp_fast) ? "fast" : "slow");
3164
3165                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3166                         seq_printf(seq, "bond %s has no active aggregator\n",
3167                                    bond->dev->name);
3168                 } else {
3169                         seq_printf(seq, "Active Aggregator Info:\n");
3170
3171                         seq_printf(seq, "\tAggregator ID: %d\n",
3172                                    ad_info.aggregator_id);
3173                         seq_printf(seq, "\tNumber of ports: %d\n",
3174                                    ad_info.ports);
3175                         seq_printf(seq, "\tActor Key: %d\n",
3176                                    ad_info.actor_key);
3177                         seq_printf(seq, "\tPartner Key: %d\n",
3178                                    ad_info.partner_key);
3179                         seq_printf(seq, "\tPartner Mac Address: %s\n",
3180                                    print_mac(mac, ad_info.partner_system));
3181                 }
3182         }
3183 }
3184
3185 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3186 {
3187         struct bonding *bond = seq->private;
3188         DECLARE_MAC_BUF(mac);
3189
3190         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3191         seq_printf(seq, "MII Status: %s\n",
3192                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3193         seq_printf(seq, "Link Failure Count: %u\n",
3194                    slave->link_failure_count);
3195
3196         seq_printf(seq,
3197                    "Permanent HW addr: %s\n",
3198                    print_mac(mac, slave->perm_hwaddr));
3199
3200         if (bond->params.mode == BOND_MODE_8023AD) {
3201                 const struct aggregator *agg
3202                         = SLAVE_AD_INFO(slave).port.aggregator;
3203
3204                 if (agg) {
3205                         seq_printf(seq, "Aggregator ID: %d\n",
3206                                    agg->aggregator_identifier);
3207                 } else {
3208                         seq_puts(seq, "Aggregator ID: N/A\n");
3209                 }
3210         }
3211 }
3212
3213 static int bond_info_seq_show(struct seq_file *seq, void *v)
3214 {
3215         if (v == SEQ_START_TOKEN) {
3216                 seq_printf(seq, "%s\n", version);
3217                 bond_info_show_master(seq);
3218         } else {
3219                 bond_info_show_slave(seq, v);
3220         }
3221
3222         return 0;
3223 }
3224
3225 static struct seq_operations bond_info_seq_ops = {
3226         .start = bond_info_seq_start,
3227         .next  = bond_info_seq_next,
3228         .stop  = bond_info_seq_stop,
3229         .show  = bond_info_seq_show,
3230 };
3231
3232 static int bond_info_open(struct inode *inode, struct file *file)
3233 {
3234         struct seq_file *seq;
3235         struct proc_dir_entry *proc;
3236         int res;
3237
3238         res = seq_open(file, &bond_info_seq_ops);
3239         if (!res) {
3240                 /* recover the pointer buried in proc_dir_entry data */
3241                 seq = file->private_data;
3242                 proc = PDE(inode);
3243                 seq->private = proc->data;
3244         }
3245
3246         return res;
3247 }
3248
3249 static const struct file_operations bond_info_fops = {
3250         .owner   = THIS_MODULE,
3251         .open    = bond_info_open,
3252         .read    = seq_read,
3253         .llseek  = seq_lseek,
3254         .release = seq_release,
3255 };
3256
3257 static int bond_create_proc_entry(struct bonding *bond)
3258 {
3259         struct net_device *bond_dev = bond->dev;
3260
3261         if (bond_proc_dir) {
3262                 bond->proc_entry = proc_create_data(bond_dev->name,
3263                                                     S_IRUGO, bond_proc_dir,
3264                                                     &bond_info_fops, bond);
3265                 if (bond->proc_entry == NULL) {
3266                         printk(KERN_WARNING DRV_NAME
3267                                ": Warning: Cannot create /proc/net/%s/%s\n",
3268                                DRV_NAME, bond_dev->name);
3269                 } else {
3270                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3271                 }
3272         }
3273
3274         return 0;
3275 }
3276
3277 static void bond_remove_proc_entry(struct bonding *bond)
3278 {
3279         if (bond_proc_dir && bond->proc_entry) {
3280                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3281                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3282                 bond->proc_entry = NULL;
3283         }
3284 }
3285
3286 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3287  * Caller must hold rtnl_lock.
3288  */
3289 static void bond_create_proc_dir(void)
3290 {
3291         int len = strlen(DRV_NAME);
3292
3293         for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
3294              bond_proc_dir = bond_proc_dir->next) {
3295                 if ((bond_proc_dir->namelen == len) &&
3296                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3297                         break;
3298                 }
3299         }
3300
3301         if (!bond_proc_dir) {
3302                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3303                 if (bond_proc_dir) {
3304                         bond_proc_dir->owner = THIS_MODULE;
3305                 } else {
3306                         printk(KERN_WARNING DRV_NAME
3307                                 ": Warning: cannot create /proc/net/%s\n",
3308                                 DRV_NAME);
3309                 }
3310         }
3311 }
3312
3313 /* Destroy the bonding directory under /proc/net, if empty.
3314  * Caller must hold rtnl_lock.
3315  */
3316 static void bond_destroy_proc_dir(void)
3317 {
3318         struct proc_dir_entry *de;
3319
3320         if (!bond_proc_dir) {
3321                 return;
3322         }
3323
3324         /* verify that the /proc dir is empty */
3325         for (de = bond_proc_dir->subdir; de; de = de->next) {
3326                 /* ignore . and .. */
3327                 if (*(de->name) != '.') {
3328                         break;
3329                 }
3330         }
3331
3332         if (de) {
3333                 if (bond_proc_dir->owner == THIS_MODULE) {
3334                         bond_proc_dir->owner = NULL;
3335                 }
3336         } else {
3337                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3338                 bond_proc_dir = NULL;
3339         }
3340 }
3341 #endif /* CONFIG_PROC_FS */
3342
3343 /*-------------------------- netdev event handling --------------------------*/
3344
3345 /*
3346  * Change device name
3347  */
3348 static int bond_event_changename(struct bonding *bond)
3349 {
3350 #ifdef CONFIG_PROC_FS
3351         bond_remove_proc_entry(bond);
3352         bond_create_proc_entry(bond);
3353 #endif
3354         down_write(&(bonding_rwsem));
3355         bond_destroy_sysfs_entry(bond);
3356         bond_create_sysfs_entry(bond);
3357         up_write(&(bonding_rwsem));
3358         return NOTIFY_DONE;
3359 }
3360
3361 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3362 {
3363         struct bonding *event_bond = bond_dev->priv;
3364
3365         switch (event) {
3366         case NETDEV_CHANGENAME:
3367                 return bond_event_changename(event_bond);
3368         case NETDEV_UNREGISTER:
3369                 bond_release_all(event_bond->dev);
3370                 break;
3371         default:
3372                 break;
3373         }
3374
3375         return NOTIFY_DONE;
3376 }
3377
3378 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3379 {
3380         struct net_device *bond_dev = slave_dev->master;
3381         struct bonding *bond = bond_dev->priv;
3382
3383         switch (event) {
3384         case NETDEV_UNREGISTER:
3385                 if (bond_dev) {
3386                         if (bond->setup_by_slave)
3387                                 bond_release_and_destroy(bond_dev, slave_dev);
3388                         else
3389                                 bond_release(bond_dev, slave_dev);
3390                 }
3391                 break;
3392         case NETDEV_CHANGE:
3393                 /*
3394                  * TODO: is this what we get if somebody
3395                  * sets up a hierarchical bond, then rmmod's
3396                  * one of the slave bonding devices?
3397                  */
3398                 break;
3399         case NETDEV_DOWN:
3400                 /*
3401                  * ... Or is it this?
3402                  */
3403                 break;
3404         case NETDEV_CHANGEMTU:
3405                 /*
3406                  * TODO: Should slaves be allowed to
3407                  * independently alter their MTU?  For
3408                  * an active-backup bond, slaves need
3409                  * not be the same type of device, so
3410                  * MTUs may vary.  For other modes,
3411                  * slaves arguably should have the
3412                  * same MTUs. To do this, we'd need to
3413                  * take over the slave's change_mtu
3414                  * function for the duration of their
3415                  * servitude.
3416                  */
3417                 break;
3418         case NETDEV_CHANGENAME:
3419                 /*
3420                  * TODO: handle changing the primary's name
3421                  */
3422                 break;
3423         case NETDEV_FEAT_CHANGE:
3424                 bond_compute_features(bond);
3425                 break;
3426         default:
3427                 break;
3428         }
3429
3430         return NOTIFY_DONE;
3431 }
3432
3433 /*
3434  * bond_netdev_event: handle netdev notifier chain events.
3435  *
3436  * This function receives events for the netdev chain.  The caller (an
3437  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3438  * locks for us to safely manipulate the slave devices (RTNL lock,
3439  * dev_probe_lock).
3440  */
3441 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3442 {
3443         struct net_device *event_dev = (struct net_device *)ptr;
3444
3445         if (dev_net(event_dev) != &init_net)
3446                 return NOTIFY_DONE;
3447
3448         dprintk("event_dev: %s, event: %lx\n",
3449                 (event_dev ? event_dev->name : "None"),
3450                 event);
3451
3452         if (!(event_dev->priv_flags & IFF_BONDING))
3453                 return NOTIFY_DONE;
3454
3455         if (event_dev->flags & IFF_MASTER) {
3456                 dprintk("IFF_MASTER\n");
3457                 return bond_master_netdev_event(event, event_dev);
3458         }
3459
3460         if (event_dev->flags & IFF_SLAVE) {
3461                 dprintk("IFF_SLAVE\n");
3462                 return bond_slave_netdev_event(event, event_dev);
3463         }
3464
3465         return NOTIFY_DONE;
3466 }
3467
3468 /*
3469  * bond_inetaddr_event: handle inetaddr notifier chain events.
3470  *
3471  * We keep track of device IPs primarily to use as source addresses in
3472  * ARP monitor probes (rather than spewing out broadcasts all the time).
3473  *
3474  * We track one IP for the main device (if it has one), plus one per VLAN.
3475  */
3476 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3477 {
3478         struct in_ifaddr *ifa = ptr;
3479         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3480         struct bonding *bond, *bond_next;
3481         struct vlan_entry *vlan, *vlan_next;
3482
3483         if (dev_net(ifa->ifa_dev->dev) != &init_net)
3484                 return NOTIFY_DONE;
3485
3486         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3487                 if (bond->dev == event_dev) {
3488                         switch (event) {
3489                         case NETDEV_UP:
3490                                 bond->master_ip = ifa->ifa_local;
3491                                 return NOTIFY_OK;
3492                         case NETDEV_DOWN:
3493                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3494                                 return NOTIFY_OK;
3495                         default:
3496                                 return NOTIFY_DONE;
3497                         }
3498                 }
3499
3500                 if (list_empty(&bond->vlan_list))
3501                         continue;
3502
3503                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3504                                          vlan_list) {
3505                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3506                         if (vlan_dev == event_dev) {
3507                                 switch (event) {
3508                                 case NETDEV_UP:
3509                                         vlan->vlan_ip = ifa->ifa_local;
3510                                         return NOTIFY_OK;
3511                                 case NETDEV_DOWN:
3512                                         vlan->vlan_ip =
3513                                                 bond_glean_dev_ip(vlan_dev);
3514                                         return NOTIFY_OK;
3515                                 default:
3516                                         return NOTIFY_DONE;
3517                                 }
3518                         }
3519                 }
3520         }
3521         return NOTIFY_DONE;
3522 }
3523
3524 static struct notifier_block bond_netdev_notifier = {
3525         .notifier_call = bond_netdev_event,
3526 };
3527
3528 static struct notifier_block bond_inetaddr_notifier = {
3529         .notifier_call = bond_inetaddr_event,
3530 };
3531
3532 /*-------------------------- Packet type handling ---------------------------*/
3533
3534 /* register to receive lacpdus on a bond */
3535 static void bond_register_lacpdu(struct bonding *bond)
3536 {
3537         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3538
3539         /* initialize packet type */
3540         pk_type->type = PKT_TYPE_LACPDU;
3541         pk_type->dev = bond->dev;
3542         pk_type->func = bond_3ad_lacpdu_recv;
3543
3544         dev_add_pack(pk_type);
3545 }
3546
3547 /* unregister to receive lacpdus on a bond */
3548 static void bond_unregister_lacpdu(struct bonding *bond)
3549 {
3550         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3551 }
3552
3553 void bond_register_arp(struct bonding *bond)
3554 {
3555         struct packet_type *pt = &bond->arp_mon_pt;
3556
3557         if (pt->type)
3558                 return;
3559
3560         pt->type = htons(ETH_P_ARP);
3561         pt->dev = bond->dev;
3562         pt->func = bond_arp_rcv;
3563         dev_add_pack(pt);
3564 }
3565
3566 void bond_unregister_arp(struct bonding *bond)
3567 {
3568         struct packet_type *pt = &bond->arp_mon_pt;
3569
3570         dev_remove_pack(pt);
3571         pt->type = 0;
3572 }
3573
3574 /*---------------------------- Hashing Policies -----------------------------*/
3575
3576 /*
3577  * Hash for the output device based upon layer 2 and layer 3 data. If
3578  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3579  */
3580 static int bond_xmit_hash_policy_l23(struct sk_buff *skb,
3581                                      struct net_device *bond_dev, int count)
3582 {
3583         struct ethhdr *data = (struct ethhdr *)skb->data;
3584         struct iphdr *iph = ip_hdr(skb);
3585
3586         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3587                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3588                         (data->h_dest[5] ^ bond_dev->dev_addr[5])) % count;
3589         }
3590
3591         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3592 }
3593
3594 /*
3595  * Hash for the output device based upon layer 3 and layer 4 data. If
3596  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3597  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3598  */
3599 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3600                                     struct net_device *bond_dev, int count)
3601 {
3602         struct ethhdr *data = (struct ethhdr *)skb->data;
3603         struct iphdr *iph = ip_hdr(skb);
3604         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3605         int layer4_xor = 0;
3606
3607         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3608                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3609                     (iph->protocol == IPPROTO_TCP ||
3610                      iph->protocol == IPPROTO_UDP)) {
3611                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3612                 }
3613                 return (layer4_xor ^
3614                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3615
3616         }
3617
3618         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3619 }
3620
3621 /*
3622  * Hash for the output device based upon layer 2 data
3623  */
3624 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3625                                    struct net_device *bond_dev, int count)
3626 {
3627         struct ethhdr *data = (struct ethhdr *)skb->data;
3628
3629         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3630 }
3631
3632 /*-------------------------- Device entry points ----------------------------*/
3633
3634 static int bond_open(struct net_device *bond_dev)
3635 {
3636         struct bonding *bond = bond_dev->priv;
3637
3638         bond->kill_timers = 0;
3639
3640         if ((bond->params.mode == BOND_MODE_TLB) ||
3641             (bond->params.mode == BOND_MODE_ALB)) {
3642                 /* bond_alb_initialize must be called before the timer
3643                  * is started.
3644                  */
3645                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3646                         /* something went wrong - fail the open operation */
3647                         return -1;
3648                 }
3649
3650                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3651                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3652         }
3653
3654         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3655                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3656                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3657         }
3658
3659         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3660                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3661                         INIT_DELAYED_WORK(&bond->arp_work,
3662                                           bond_activebackup_arp_mon);
3663                 else
3664                         INIT_DELAYED_WORK(&bond->arp_work,
3665                                           bond_loadbalance_arp_mon);
3666
3667                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3668                 if (bond->params.arp_validate)
3669                         bond_register_arp(bond);
3670         }
3671
3672         if (bond->params.mode == BOND_MODE_8023AD) {
3673                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3674                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3675                 /* register to receive LACPDUs */
3676                 bond_register_lacpdu(bond);
3677         }
3678
3679         return 0;
3680 }
3681
3682 static int bond_close(struct net_device *bond_dev)
3683 {
3684         struct bonding *bond = bond_dev->priv;
3685
3686         if (bond->params.mode == BOND_MODE_8023AD) {
3687                 /* Unregister the receive of LACPDUs */
3688                 bond_unregister_lacpdu(bond);
3689         }
3690
3691         if (bond->params.arp_validate)
3692                 bond_unregister_arp(bond);
3693
3694         write_lock_bh(&bond->lock);
3695
3696
3697         /* signal timers not to re-arm */
3698         bond->kill_timers = 1;
3699
3700         write_unlock_bh(&bond->lock);
3701
3702         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3703                 cancel_delayed_work(&bond->mii_work);
3704         }
3705
3706         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3707                 cancel_delayed_work(&bond->arp_work);
3708         }
3709
3710         switch (bond->params.mode) {
3711         case BOND_MODE_8023AD:
3712                 cancel_delayed_work(&bond->ad_work);
3713                 break;
3714         case BOND_MODE_TLB:
3715         case BOND_MODE_ALB:
3716                 cancel_delayed_work(&bond->alb_work);
3717                 break;
3718         default:
3719                 break;
3720         }
3721
3722
3723         if ((bond->params.mode == BOND_MODE_TLB) ||
3724             (bond->params.mode == BOND_MODE_ALB)) {
3725                 /* Must be called only after all
3726                  * slaves have been released
3727                  */
3728                 bond_alb_deinitialize(bond);
3729         }
3730
3731         return 0;
3732 }
3733
3734 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3735 {
3736         struct bonding *bond = bond_dev->priv;
3737         struct net_device_stats *stats = &(bond->stats), *sstats;
3738         struct net_device_stats local_stats;
3739         struct slave *slave;
3740         int i;
3741
3742         memset(&local_stats, 0, sizeof(struct net_device_stats));
3743
3744         read_lock_bh(&bond->lock);
3745
3746         bond_for_each_slave(bond, slave, i) {
3747                 sstats = slave->dev->get_stats(slave->dev);
3748                 local_stats.rx_packets += sstats->rx_packets;
3749                 local_stats.rx_bytes += sstats->rx_bytes;
3750                 local_stats.rx_errors += sstats->rx_errors;
3751                 local_stats.rx_dropped += sstats->rx_dropped;
3752
3753                 local_stats.tx_packets += sstats->tx_packets;
3754                 local_stats.tx_bytes += sstats->tx_bytes;
3755                 local_stats.tx_errors += sstats->tx_errors;
3756                 local_stats.tx_dropped += sstats->tx_dropped;
3757
3758                 local_stats.multicast += sstats->multicast;
3759                 local_stats.collisions += sstats->collisions;
3760
3761                 local_stats.rx_length_errors += sstats->rx_length_errors;
3762                 local_stats.rx_over_errors += sstats->rx_over_errors;
3763                 local_stats.rx_crc_errors += sstats->rx_crc_errors;
3764                 local_stats.rx_frame_errors += sstats->rx_frame_errors;
3765                 local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
3766                 local_stats.rx_missed_errors += sstats->rx_missed_errors;
3767
3768                 local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
3769                 local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
3770                 local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
3771                 local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3772                 local_stats.tx_window_errors += sstats->tx_window_errors;
3773         }
3774
3775         memcpy(stats, &local_stats, sizeof(struct net_device_stats));
3776
3777         read_unlock_bh(&bond->lock);
3778
3779         return stats;
3780 }
3781
3782 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3783 {
3784         struct net_device *slave_dev = NULL;
3785         struct ifbond k_binfo;
3786         struct ifbond __user *u_binfo = NULL;
3787         struct ifslave k_sinfo;
3788         struct ifslave __user *u_sinfo = NULL;
3789         struct mii_ioctl_data *mii = NULL;
3790         int res = 0;
3791
3792         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3793                 bond_dev->name, cmd);
3794
3795         switch (cmd) {
3796         case SIOCGMIIPHY:
3797                 mii = if_mii(ifr);
3798                 if (!mii) {
3799                         return -EINVAL;
3800                 }
3801                 mii->phy_id = 0;
3802                 /* Fall Through */
3803         case SIOCGMIIREG:
3804                 /*
3805                  * We do this again just in case we were called by SIOCGMIIREG
3806                  * instead of SIOCGMIIPHY.
3807                  */
3808                 mii = if_mii(ifr);
3809                 if (!mii) {
3810                         return -EINVAL;
3811                 }
3812
3813                 if (mii->reg_num == 1) {
3814                         struct bonding *bond = bond_dev->priv;
3815                         mii->val_out = 0;
3816                         read_lock(&bond->lock);
3817                         read_lock(&bond->curr_slave_lock);
3818                         if (netif_carrier_ok(bond->dev)) {
3819                                 mii->val_out = BMSR_LSTATUS;
3820                         }
3821                         read_unlock(&bond->curr_slave_lock);
3822                         read_unlock(&bond->lock);
3823                 }
3824
3825                 return 0;
3826         case BOND_INFO_QUERY_OLD:
3827         case SIOCBONDINFOQUERY:
3828                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3829
3830                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3831                         return -EFAULT;
3832                 }
3833
3834                 res = bond_info_query(bond_dev, &k_binfo);
3835                 if (res == 0) {
3836                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3837                                 return -EFAULT;
3838                         }
3839                 }
3840
3841                 return res;
3842         case BOND_SLAVE_INFO_QUERY_OLD:
3843         case SIOCBONDSLAVEINFOQUERY:
3844                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3845
3846                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3847                         return -EFAULT;
3848                 }
3849
3850                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3851                 if (res == 0) {
3852                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3853                                 return -EFAULT;
3854                         }
3855                 }
3856
3857                 return res;
3858         default:
3859                 /* Go on */
3860                 break;
3861         }
3862
3863         if (!capable(CAP_NET_ADMIN)) {
3864                 return -EPERM;
3865         }
3866
3867         down_write(&(bonding_rwsem));
3868         slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
3869
3870         dprintk("slave_dev=%p: \n", slave_dev);
3871
3872         if (!slave_dev) {
3873                 res = -ENODEV;
3874         } else {
3875                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3876                 switch (cmd) {
3877                 case BOND_ENSLAVE_OLD:
3878                 case SIOCBONDENSLAVE:
3879                         res = bond_enslave(bond_dev, slave_dev);
3880                         break;
3881                 case BOND_RELEASE_OLD:
3882                 case SIOCBONDRELEASE:
3883                         res = bond_release(bond_dev, slave_dev);
3884                         break;
3885                 case BOND_SETHWADDR_OLD:
3886                 case SIOCBONDSETHWADDR:
3887                         res = bond_sethwaddr(bond_dev, slave_dev);
3888                         break;
3889                 case BOND_CHANGE_ACTIVE_OLD:
3890                 case SIOCBONDCHANGEACTIVE:
3891                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3892                         break;
3893                 default:
3894                         res = -EOPNOTSUPP;
3895                 }
3896
3897                 dev_put(slave_dev);
3898         }
3899
3900         up_write(&(bonding_rwsem));
3901         return res;
3902 }
3903
3904 static void bond_set_multicast_list(struct net_device *bond_dev)
3905 {
3906         struct bonding *bond = bond_dev->priv;
3907         struct dev_mc_list *dmi;
3908
3909         /*
3910          * Do promisc before checking multicast_mode
3911          */
3912         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3913                 bond_set_promiscuity(bond, 1);
3914         }
3915
3916         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3917                 bond_set_promiscuity(bond, -1);
3918         }
3919
3920         /* set allmulti flag to slaves */
3921         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3922                 bond_set_allmulti(bond, 1);
3923         }
3924
3925         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3926                 bond_set_allmulti(bond, -1);
3927         }
3928
3929         read_lock(&bond->lock);
3930
3931         bond->flags = bond_dev->flags;
3932
3933         /* looking for addresses to add to slaves' mc list */
3934         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3935                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3936                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3937                 }
3938         }
3939
3940         /* looking for addresses to delete from slaves' list */
3941         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3942                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3943                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3944                 }
3945         }
3946
3947         /* save master's multicast list */
3948         bond_mc_list_destroy(bond);
3949         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3950
3951         read_unlock(&bond->lock);
3952 }
3953
3954 /*
3955  * Change the MTU of all of a master's slaves to match the master
3956  */
3957 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3958 {
3959         struct bonding *bond = bond_dev->priv;
3960         struct slave *slave, *stop_at;
3961         int res = 0;
3962         int i;
3963
3964         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3965                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3966
3967         /* Can't hold bond->lock with bh disabled here since
3968          * some base drivers panic. On the other hand we can't
3969          * hold bond->lock without bh disabled because we'll
3970          * deadlock. The only solution is to rely on the fact
3971          * that we're under rtnl_lock here, and the slaves
3972          * list won't change. This doesn't solve the problem
3973          * of setting the slave's MTU while it is
3974          * transmitting, but the assumption is that the base
3975          * driver can handle that.
3976          *
3977          * TODO: figure out a way to safely iterate the slaves
3978          * list, but without holding a lock around the actual
3979          * call to the base driver.
3980          */
3981
3982         bond_for_each_slave(bond, slave, i) {
3983                 dprintk("s %p s->p %p c_m %p\n", slave,
3984                         slave->prev, slave->dev->change_mtu);
3985
3986                 res = dev_set_mtu(slave->dev, new_mtu);
3987
3988                 if (res) {
3989                         /* If we failed to set the slave's mtu to the new value
3990                          * we must abort the operation even in ACTIVE_BACKUP
3991                          * mode, because if we allow the backup slaves to have
3992                          * different mtu values than the active slave we'll
3993                          * need to change their mtu when doing a failover. That
3994                          * means changing their mtu from timer context, which
3995                          * is probably not a good idea.
3996                          */
3997                         dprintk("err %d %s\n", res, slave->dev->name);
3998                         goto unwind;
3999                 }
4000         }
4001
4002         bond_dev->mtu = new_mtu;
4003
4004         return 0;
4005
4006 unwind:
4007         /* unwind from head to the slave that failed */
4008         stop_at = slave;
4009         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4010                 int tmp_res;
4011
4012                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4013                 if (tmp_res) {
4014                         dprintk("unwind err %d dev %s\n", tmp_res,
4015                                 slave->dev->name);
4016                 }
4017         }
4018
4019         return res;
4020 }
4021
4022 /*
4023  * Change HW address
4024  *
4025  * Note that many devices must be down to change the HW address, and
4026  * downing the master releases all slaves.  We can make bonds full of
4027  * bonding devices to test this, however.
4028  */
4029 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4030 {
4031         struct bonding *bond = bond_dev->priv;
4032         struct sockaddr *sa = addr, tmp_sa;
4033         struct slave *slave, *stop_at;
4034         int res = 0;
4035         int i;
4036
4037         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
4038
4039         /*
4040          * If fail_over_mac is enabled, do nothing and return success.
4041          * Returning an error causes ifenslave to fail.
4042          */
4043         if (bond->params.fail_over_mac)
4044                 return 0;
4045
4046         if (!is_valid_ether_addr(sa->sa_data)) {
4047                 return -EADDRNOTAVAIL;
4048         }
4049
4050         /* Can't hold bond->lock with bh disabled here since
4051          * some base drivers panic. On the other hand we can't
4052          * hold bond->lock without bh disabled because we'll
4053          * deadlock. The only solution is to rely on the fact
4054          * that we're under rtnl_lock here, and the slaves
4055          * list won't change. This doesn't solve the problem
4056          * of setting the slave's hw address while it is
4057          * transmitting, but the assumption is that the base
4058          * driver can handle that.
4059          *
4060          * TODO: figure out a way to safely iterate the slaves
4061          * list, but without holding a lock around the actual
4062          * call to the base driver.
4063          */
4064
4065         bond_for_each_slave(bond, slave, i) {
4066                 dprintk("slave %p %s\n", slave, slave->dev->name);
4067
4068                 if (slave->dev->set_mac_address == NULL) {
4069                         res = -EOPNOTSUPP;
4070                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
4071                         goto unwind;
4072                 }
4073
4074                 res = dev_set_mac_address(slave->dev, addr);
4075                 if (res) {
4076                         /* TODO: consider downing the slave
4077                          * and retry ?
4078                          * User should expect communications
4079                          * breakage anyway until ARP finish
4080                          * updating, so...
4081                          */
4082                         dprintk("err %d %s\n", res, slave->dev->name);
4083                         goto unwind;
4084                 }
4085         }
4086
4087         /* success */
4088         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4089         return 0;
4090
4091 unwind:
4092         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4093         tmp_sa.sa_family = bond_dev->type;
4094
4095         /* unwind from head to the slave that failed */
4096         stop_at = slave;
4097         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4098                 int tmp_res;
4099
4100                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4101                 if (tmp_res) {
4102                         dprintk("unwind err %d dev %s\n", tmp_res,
4103                                 slave->dev->name);
4104                 }
4105         }
4106
4107         return res;
4108 }
4109
4110 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4111 {
4112         struct bonding *bond = bond_dev->priv;
4113         struct slave *slave, *start_at;
4114         int i, slave_no, res = 1;
4115
4116         read_lock(&bond->lock);
4117
4118         if (!BOND_IS_OK(bond)) {
4119                 goto out;
4120         }
4121
4122         /*
4123          * Concurrent TX may collide on rr_tx_counter; we accept that
4124          * as being rare enough not to justify using an atomic op here
4125          */
4126         slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4127
4128         bond_for_each_slave(bond, slave, i) {
4129                 slave_no--;
4130                 if (slave_no < 0) {
4131                         break;
4132                 }
4133         }
4134
4135         start_at = slave;
4136         bond_for_each_slave_from(bond, slave, i, start_at) {
4137                 if (IS_UP(slave->dev) &&
4138                     (slave->link == BOND_LINK_UP) &&
4139                     (slave->state == BOND_STATE_ACTIVE)) {
4140                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4141                         break;
4142                 }
4143         }
4144
4145 out:
4146         if (res) {
4147                 /* no suitable interface, frame not sent */
4148                 dev_kfree_skb(skb);
4149         }
4150         read_unlock(&bond->lock);
4151         return 0;
4152 }
4153
4154
4155 /*
4156  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4157  * the bond has a usable interface.
4158  */
4159 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4160 {
4161         struct bonding *bond = bond_dev->priv;
4162         int res = 1;
4163
4164         read_lock(&bond->lock);
4165         read_lock(&bond->curr_slave_lock);
4166
4167         if (!BOND_IS_OK(bond)) {
4168                 goto out;
4169         }
4170
4171         if (!bond->curr_active_slave)
4172                 goto out;
4173
4174         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4175
4176 out:
4177         if (res) {
4178                 /* no suitable interface, frame not sent */
4179                 dev_kfree_skb(skb);
4180         }
4181         read_unlock(&bond->curr_slave_lock);
4182         read_unlock(&bond->lock);
4183         return 0;
4184 }
4185
4186 /*
4187  * In bond_xmit_xor() , we determine the output device by using a pre-
4188  * determined xmit_hash_policy(), If the selected device is not enabled,
4189  * find the next active slave.
4190  */
4191 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4192 {
4193         struct bonding *bond = bond_dev->priv;
4194         struct slave *slave, *start_at;
4195         int slave_no;
4196         int i;
4197         int res = 1;
4198
4199         read_lock(&bond->lock);
4200
4201         if (!BOND_IS_OK(bond)) {
4202                 goto out;
4203         }
4204
4205         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4206
4207         bond_for_each_slave(bond, slave, i) {
4208                 slave_no--;
4209                 if (slave_no < 0) {
4210                         break;
4211                 }
4212         }
4213
4214         start_at = slave;
4215
4216         bond_for_each_slave_from(bond, slave, i, start_at) {
4217                 if (IS_UP(slave->dev) &&
4218                     (slave->link == BOND_LINK_UP) &&
4219                     (slave->state == BOND_STATE_ACTIVE)) {
4220                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4221                         break;
4222                 }
4223         }
4224
4225 out:
4226         if (res) {
4227                 /* no suitable interface, frame not sent */
4228                 dev_kfree_skb(skb);
4229         }
4230         read_unlock(&bond->lock);
4231         return 0;
4232 }
4233
4234 /*
4235  * in broadcast mode, we send everything to all usable interfaces.
4236  */
4237 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4238 {
4239         struct bonding *bond = bond_dev->priv;
4240         struct slave *slave, *start_at;
4241         struct net_device *tx_dev = NULL;
4242         int i;
4243         int res = 1;
4244
4245         read_lock(&bond->lock);
4246
4247         if (!BOND_IS_OK(bond)) {
4248                 goto out;
4249         }
4250
4251         read_lock(&bond->curr_slave_lock);
4252         start_at = bond->curr_active_slave;
4253         read_unlock(&bond->curr_slave_lock);
4254
4255         if (!start_at) {
4256                 goto out;
4257         }
4258
4259         bond_for_each_slave_from(bond, slave, i, start_at) {
4260                 if (IS_UP(slave->dev) &&
4261                     (slave->link == BOND_LINK_UP) &&
4262                     (slave->state == BOND_STATE_ACTIVE)) {
4263                         if (tx_dev) {
4264                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4265                                 if (!skb2) {
4266                                         printk(KERN_ERR DRV_NAME
4267                                                ": %s: Error: bond_xmit_broadcast(): "
4268                                                "skb_clone() failed\n",
4269                                                bond_dev->name);
4270                                         continue;
4271                                 }
4272
4273                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4274                                 if (res) {
4275                                         dev_kfree_skb(skb2);
4276                                         continue;
4277                                 }
4278                         }
4279                         tx_dev = slave->dev;
4280                 }
4281         }
4282
4283         if (tx_dev) {
4284                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4285         }
4286
4287 out:
4288         if (res) {
4289                 /* no suitable interface, frame not sent */
4290                 dev_kfree_skb(skb);
4291         }
4292         /* frame sent to all suitable interfaces */
4293         read_unlock(&bond->lock);
4294         return 0;
4295 }
4296
4297 /*------------------------- Device initialization ---------------------------*/
4298
4299 static void bond_set_xmit_hash_policy(struct bonding *bond)
4300 {
4301         switch (bond->params.xmit_policy) {
4302         case BOND_XMIT_POLICY_LAYER23:
4303                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4304                 break;
4305         case BOND_XMIT_POLICY_LAYER34:
4306                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4307                 break;
4308         case BOND_XMIT_POLICY_LAYER2:
4309         default:
4310                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4311                 break;
4312         }
4313 }
4314
4315 /*
4316  * set bond mode specific net device operations
4317  */
4318 void bond_set_mode_ops(struct bonding *bond, int mode)
4319 {
4320         struct net_device *bond_dev = bond->dev;
4321
4322         switch (mode) {
4323         case BOND_MODE_ROUNDROBIN:
4324                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4325                 break;
4326         case BOND_MODE_ACTIVEBACKUP:
4327                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4328                 break;
4329         case BOND_MODE_XOR:
4330                 bond_dev->hard_start_xmit = bond_xmit_xor;
4331                 bond_set_xmit_hash_policy(bond);
4332                 break;
4333         case BOND_MODE_BROADCAST:
4334                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4335                 break;
4336         case BOND_MODE_8023AD:
4337                 bond_set_master_3ad_flags(bond);
4338                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4339                 bond_set_xmit_hash_policy(bond);
4340                 break;
4341         case BOND_MODE_ALB:
4342                 bond_set_master_alb_flags(bond);
4343                 /* FALLTHRU */
4344         case BOND_MODE_TLB:
4345                 bond_dev->hard_start_xmit = bond_alb_xmit;
4346                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4347                 break;
4348         default:
4349                 /* Should never happen, mode already checked */
4350                 printk(KERN_ERR DRV_NAME
4351                        ": %s: Error: Unknown bonding mode %d\n",
4352                        bond_dev->name,
4353                        mode);
4354                 break;
4355         }
4356 }
4357
4358 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4359                                     struct ethtool_drvinfo *drvinfo)
4360 {
4361         strncpy(drvinfo->driver, DRV_NAME, 32);
4362         strncpy(drvinfo->version, DRV_VERSION, 32);
4363         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4364 }
4365
4366 static const struct ethtool_ops bond_ethtool_ops = {
4367         .get_drvinfo            = bond_ethtool_get_drvinfo,
4368 };
4369
4370 /*
4371  * Does not allocate but creates a /proc entry.
4372  * Allowed to fail.
4373  */
4374 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4375 {
4376         struct bonding *bond = bond_dev->priv;
4377
4378         dprintk("Begin bond_init for %s\n", bond_dev->name);
4379
4380         /* initialize rwlocks */
4381         rwlock_init(&bond->lock);
4382         rwlock_init(&bond->curr_slave_lock);
4383
4384         bond->params = *params; /* copy params struct */
4385
4386         bond->wq = create_singlethread_workqueue(bond_dev->name);
4387         if (!bond->wq)
4388                 return -ENOMEM;
4389
4390         /* Initialize pointers */
4391         bond->first_slave = NULL;
4392         bond->curr_active_slave = NULL;
4393         bond->current_arp_slave = NULL;
4394         bond->primary_slave = NULL;
4395         bond->dev = bond_dev;
4396         bond->send_grat_arp = 0;
4397         bond->setup_by_slave = 0;
4398         INIT_LIST_HEAD(&bond->vlan_list);
4399
4400         /* Initialize the device entry points */
4401         bond_dev->open = bond_open;
4402         bond_dev->stop = bond_close;
4403         bond_dev->get_stats = bond_get_stats;
4404         bond_dev->do_ioctl = bond_do_ioctl;
4405         bond_dev->ethtool_ops = &bond_ethtool_ops;
4406         bond_dev->set_multicast_list = bond_set_multicast_list;
4407         bond_dev->change_mtu = bond_change_mtu;
4408         bond_dev->set_mac_address = bond_set_mac_address;
4409         bond_dev->validate_addr = NULL;
4410
4411         bond_set_mode_ops(bond, bond->params.mode);
4412
4413         bond_dev->destructor = free_netdev;
4414
4415         /* Initialize the device options */
4416         bond_dev->tx_queue_len = 0;
4417         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4418         bond_dev->priv_flags |= IFF_BONDING;
4419
4420         /* At first, we block adding VLANs. That's the only way to
4421          * prevent problems that occur when adding VLANs over an
4422          * empty bond. The block will be removed once non-challenged
4423          * slaves are enslaved.
4424          */
4425         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4426
4427         /* don't acquire bond device's netif_tx_lock when
4428          * transmitting */
4429         bond_dev->features |= NETIF_F_LLTX;
4430
4431         /* By default, we declare the bond to be fully
4432          * VLAN hardware accelerated capable. Special
4433          * care is taken in the various xmit functions
4434          * when there are slaves that are not hw accel
4435          * capable
4436          */
4437         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4438         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4439         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4440         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4441                                NETIF_F_HW_VLAN_RX |
4442                                NETIF_F_HW_VLAN_FILTER);
4443
4444 #ifdef CONFIG_PROC_FS
4445         bond_create_proc_entry(bond);
4446 #endif
4447         list_add_tail(&bond->bond_list, &bond_dev_list);
4448
4449         return 0;
4450 }
4451
4452 /* De-initialize device specific data.
4453  * Caller must hold rtnl_lock.
4454  */
4455 static void bond_deinit(struct net_device *bond_dev)
4456 {
4457         struct bonding *bond = bond_dev->priv;
4458
4459         list_del(&bond->bond_list);
4460
4461 #ifdef CONFIG_PROC_FS
4462         bond_remove_proc_entry(bond);
4463 #endif
4464 }
4465
4466 static void bond_work_cancel_all(struct bonding *bond)
4467 {
4468         write_lock_bh(&bond->lock);
4469         bond->kill_timers = 1;
4470         write_unlock_bh(&bond->lock);
4471
4472         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4473                 cancel_delayed_work(&bond->mii_work);
4474
4475         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4476                 cancel_delayed_work(&bond->arp_work);
4477
4478         if (bond->params.mode == BOND_MODE_ALB &&
4479             delayed_work_pending(&bond->alb_work))
4480                 cancel_delayed_work(&bond->alb_work);
4481
4482         if (bond->params.mode == BOND_MODE_8023AD &&
4483             delayed_work_pending(&bond->ad_work))
4484                 cancel_delayed_work(&bond->ad_work);
4485 }
4486
4487 /* Unregister and free all bond devices.
4488  * Caller must hold rtnl_lock.
4489  */
4490 static void bond_free_all(void)
4491 {
4492         struct bonding *bond, *nxt;
4493
4494         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4495                 struct net_device *bond_dev = bond->dev;
4496
4497                 bond_work_cancel_all(bond);
4498                 netif_tx_lock_bh(bond_dev);
4499                 bond_mc_list_destroy(bond);
4500                 netif_tx_unlock_bh(bond_dev);
4501                 /* Release the bonded slaves */
4502                 bond_release_all(bond_dev);
4503                 bond_destroy(bond);
4504         }
4505
4506 #ifdef CONFIG_PROC_FS
4507         bond_destroy_proc_dir();
4508 #endif
4509 }
4510
4511 /*------------------------- Module initialization ---------------------------*/
4512
4513 /*
4514  * Convert string input module parms.  Accept either the
4515  * number of the mode or its string name.  A bit complicated because
4516  * some mode names are substrings of other names, and calls from sysfs
4517  * may have whitespace in the name (trailing newlines, for example).
4518  */
4519 int bond_parse_parm(const char *buf, struct bond_parm_tbl *tbl)
4520 {
4521         int mode = -1, i, rv;
4522         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4523
4524         for (p = (char *)buf; *p; p++)
4525                 if (!(isdigit(*p) || isspace(*p)))
4526                         break;
4527
4528         if (*p)
4529                 rv = sscanf(buf, "%20s", modestr);
4530         else
4531                 rv = sscanf(buf, "%d", &mode);
4532
4533         if (!rv)
4534                 return -1;
4535
4536         for (i = 0; tbl[i].modename; i++) {
4537                 if (mode == tbl[i].mode)
4538                         return tbl[i].mode;
4539                 if (strcmp(modestr, tbl[i].modename) == 0)
4540                         return tbl[i].mode;
4541         }
4542
4543         return -1;
4544 }
4545
4546 static int bond_check_params(struct bond_params *params)
4547 {
4548         int arp_validate_value;
4549
4550         /*
4551          * Convert string parameters.
4552          */
4553         if (mode) {
4554                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4555                 if (bond_mode == -1) {
4556                         printk(KERN_ERR DRV_NAME
4557                                ": Error: Invalid bonding mode \"%s\"\n",
4558                                mode == NULL ? "NULL" : mode);
4559                         return -EINVAL;
4560                 }
4561         }
4562
4563         if (xmit_hash_policy) {
4564                 if ((bond_mode != BOND_MODE_XOR) &&
4565                     (bond_mode != BOND_MODE_8023AD)) {
4566                         printk(KERN_INFO DRV_NAME
4567                                ": xor_mode param is irrelevant in mode %s\n",
4568                                bond_mode_name(bond_mode));
4569                 } else {
4570                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4571                                                         xmit_hashtype_tbl);
4572                         if (xmit_hashtype == -1) {
4573                                 printk(KERN_ERR DRV_NAME
4574                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4575                                 xmit_hash_policy == NULL ? "NULL" :
4576                                        xmit_hash_policy);
4577                                 return -EINVAL;
4578                         }
4579                 }
4580         }
4581
4582         if (lacp_rate) {
4583                 if (bond_mode != BOND_MODE_8023AD) {
4584                         printk(KERN_INFO DRV_NAME
4585                                ": lacp_rate param is irrelevant in mode %s\n",
4586                                bond_mode_name(bond_mode));
4587                 } else {
4588                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4589                         if (lacp_fast == -1) {
4590                                 printk(KERN_ERR DRV_NAME
4591                                        ": Error: Invalid lacp rate \"%s\"\n",
4592                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4593                                 return -EINVAL;
4594                         }
4595                 }
4596         }
4597
4598         if (max_bonds < 1 || max_bonds > INT_MAX) {
4599                 printk(KERN_WARNING DRV_NAME
4600                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4601                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4602                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4603                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4604         }
4605
4606         if (miimon < 0) {
4607                 printk(KERN_WARNING DRV_NAME
4608                        ": Warning: miimon module parameter (%d), "
4609                        "not in range 0-%d, so it was reset to %d\n",
4610                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4611                 miimon = BOND_LINK_MON_INTERV;
4612         }
4613
4614         if (updelay < 0) {
4615                 printk(KERN_WARNING DRV_NAME
4616                        ": Warning: updelay module parameter (%d), "
4617                        "not in range 0-%d, so it was reset to 0\n",
4618                        updelay, INT_MAX);
4619                 updelay = 0;
4620         }
4621
4622         if (downdelay < 0) {
4623                 printk(KERN_WARNING DRV_NAME
4624                        ": Warning: downdelay module parameter (%d), "
4625                        "not in range 0-%d, so it was reset to 0\n",
4626                        downdelay, INT_MAX);
4627                 downdelay = 0;
4628         }
4629
4630         if ((use_carrier != 0) && (use_carrier != 1)) {
4631                 printk(KERN_WARNING DRV_NAME
4632                        ": Warning: use_carrier module parameter (%d), "
4633                        "not of valid value (0/1), so it was set to 1\n",
4634                        use_carrier);
4635                 use_carrier = 1;
4636         }
4637
4638         /* reset values for 802.3ad */
4639         if (bond_mode == BOND_MODE_8023AD) {
4640                 if (!miimon) {
4641                         printk(KERN_WARNING DRV_NAME
4642                                ": Warning: miimon must be specified, "
4643                                "otherwise bonding will not detect link "
4644                                "failure, speed and duplex which are "
4645                                "essential for 802.3ad operation\n");
4646                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4647                         miimon = 100;
4648                 }
4649         }
4650
4651         /* reset values for TLB/ALB */
4652         if ((bond_mode == BOND_MODE_TLB) ||
4653             (bond_mode == BOND_MODE_ALB)) {
4654                 if (!miimon) {
4655                         printk(KERN_WARNING DRV_NAME
4656                                ": Warning: miimon must be specified, "
4657                                "otherwise bonding will not detect link "
4658                                "failure and link speed which are essential "
4659                                "for TLB/ALB load balancing\n");
4660                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4661                         miimon = 100;
4662                 }
4663         }
4664
4665         if (bond_mode == BOND_MODE_ALB) {
4666                 printk(KERN_NOTICE DRV_NAME
4667                        ": In ALB mode you might experience client "
4668                        "disconnections upon reconnection of a link if the "
4669                        "bonding module updelay parameter (%d msec) is "
4670                        "incompatible with the forwarding delay time of the "
4671                        "switch\n",
4672                        updelay);
4673         }
4674
4675         if (!miimon) {
4676                 if (updelay || downdelay) {
4677                         /* just warn the user the up/down delay will have
4678                          * no effect since miimon is zero...
4679                          */
4680                         printk(KERN_WARNING DRV_NAME
4681                                ": Warning: miimon module parameter not set "
4682                                "and updelay (%d) or downdelay (%d) module "
4683                                "parameter is set; updelay and downdelay have "
4684                                "no effect unless miimon is set\n",
4685                                updelay, downdelay);
4686                 }
4687         } else {
4688                 /* don't allow arp monitoring */
4689                 if (arp_interval) {
4690                         printk(KERN_WARNING DRV_NAME
4691                                ": Warning: miimon (%d) and arp_interval (%d) "
4692                                "can't be used simultaneously, disabling ARP "
4693                                "monitoring\n",
4694                                miimon, arp_interval);
4695                         arp_interval = 0;
4696                 }
4697
4698                 if ((updelay % miimon) != 0) {
4699                         printk(KERN_WARNING DRV_NAME
4700                                ": Warning: updelay (%d) is not a multiple "
4701                                "of miimon (%d), updelay rounded to %d ms\n",
4702                                updelay, miimon, (updelay / miimon) * miimon);
4703                 }
4704
4705                 updelay /= miimon;
4706
4707                 if ((downdelay % miimon) != 0) {
4708                         printk(KERN_WARNING DRV_NAME
4709                                ": Warning: downdelay (%d) is not a multiple "
4710                                "of miimon (%d), downdelay rounded to %d ms\n",
4711                                downdelay, miimon,
4712                                (downdelay / miimon) * miimon);
4713                 }
4714
4715                 downdelay /= miimon;
4716         }
4717
4718         if (arp_interval < 0) {
4719                 printk(KERN_WARNING DRV_NAME
4720                        ": Warning: arp_interval module parameter (%d) "
4721                        ", not in range 0-%d, so it was reset to %d\n",
4722                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4723                 arp_interval = BOND_LINK_ARP_INTERV;
4724         }
4725
4726         for (arp_ip_count = 0;
4727              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4728              arp_ip_count++) {
4729                 /* not complete check, but should be good enough to
4730                    catch mistakes */
4731                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4732                         printk(KERN_WARNING DRV_NAME
4733                                ": Warning: bad arp_ip_target module parameter "
4734                                "(%s), ARP monitoring will not be performed\n",
4735                                arp_ip_target[arp_ip_count]);
4736                         arp_interval = 0;
4737                 } else {
4738                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4739                         arp_target[arp_ip_count] = ip;
4740                 }
4741         }
4742
4743         if (arp_interval && !arp_ip_count) {
4744                 /* don't allow arping if no arp_ip_target given... */
4745                 printk(KERN_WARNING DRV_NAME
4746                        ": Warning: arp_interval module parameter (%d) "
4747                        "specified without providing an arp_ip_target "
4748                        "parameter, arp_interval was reset to 0\n",
4749                        arp_interval);
4750                 arp_interval = 0;
4751         }
4752
4753         if (arp_validate) {
4754                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4755                         printk(KERN_ERR DRV_NAME
4756                ": arp_validate only supported in active-backup mode\n");
4757                         return -EINVAL;
4758                 }
4759                 if (!arp_interval) {
4760                         printk(KERN_ERR DRV_NAME
4761                                ": arp_validate requires arp_interval\n");
4762                         return -EINVAL;
4763                 }
4764
4765                 arp_validate_value = bond_parse_parm(arp_validate,
4766                                                      arp_validate_tbl);
4767                 if (arp_validate_value == -1) {
4768                         printk(KERN_ERR DRV_NAME
4769                                ": Error: invalid arp_validate \"%s\"\n",
4770                                arp_validate == NULL ? "NULL" : arp_validate);
4771                         return -EINVAL;
4772                 }
4773         } else
4774                 arp_validate_value = 0;
4775
4776         if (miimon) {
4777                 printk(KERN_INFO DRV_NAME
4778                        ": MII link monitoring set to %d ms\n",
4779                        miimon);
4780         } else if (arp_interval) {
4781                 int i;
4782
4783                 printk(KERN_INFO DRV_NAME
4784                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4785                        arp_interval,
4786                        arp_validate_tbl[arp_validate_value].modename,
4787                        arp_ip_count);
4788
4789                 for (i = 0; i < arp_ip_count; i++)
4790                         printk (" %s", arp_ip_target[i]);
4791
4792                 printk("\n");
4793
4794         } else {
4795                 /* miimon and arp_interval not set, we need one so things
4796                  * work as expected, see bonding.txt for details
4797                  */
4798                 printk(KERN_WARNING DRV_NAME
4799                        ": Warning: either miimon or arp_interval and "
4800                        "arp_ip_target module parameters must be specified, "
4801                        "otherwise bonding will not detect link failures! see "
4802                        "bonding.txt for details.\n");
4803         }
4804
4805         if (primary && !USES_PRIMARY(bond_mode)) {
4806                 /* currently, using a primary only makes sense
4807                  * in active backup, TLB or ALB modes
4808                  */
4809                 printk(KERN_WARNING DRV_NAME
4810                        ": Warning: %s primary device specified but has no "
4811                        "effect in %s mode\n",
4812                        primary, bond_mode_name(bond_mode));
4813                 primary = NULL;
4814         }
4815
4816         if (fail_over_mac && (bond_mode != BOND_MODE_ACTIVEBACKUP))
4817                 printk(KERN_WARNING DRV_NAME
4818                        ": Warning: fail_over_mac only affects "
4819                        "active-backup mode.\n");
4820
4821         /* fill params struct with the proper values */
4822         params->mode = bond_mode;
4823         params->xmit_policy = xmit_hashtype;
4824         params->miimon = miimon;
4825         params->arp_interval = arp_interval;
4826         params->arp_validate = arp_validate_value;
4827         params->updelay = updelay;
4828         params->downdelay = downdelay;
4829         params->use_carrier = use_carrier;
4830         params->lacp_fast = lacp_fast;
4831         params->primary[0] = 0;
4832         params->fail_over_mac = fail_over_mac;
4833
4834         if (primary) {
4835                 strncpy(params->primary, primary, IFNAMSIZ);
4836                 params->primary[IFNAMSIZ - 1] = 0;
4837         }
4838
4839         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4840
4841         return 0;
4842 }
4843
4844 static struct lock_class_key bonding_netdev_xmit_lock_key;
4845
4846 /* Create a new bond based on the specified name and bonding parameters.
4847  * If name is NULL, obtain a suitable "bond%d" name for us.
4848  * Caller must NOT hold rtnl_lock; we need to release it here before we
4849  * set up our sysfs entries.
4850  */
4851 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4852 {
4853         struct net_device *bond_dev;
4854         struct bonding *bond, *nxt;
4855         int res;
4856
4857         rtnl_lock();
4858         down_write(&bonding_rwsem);
4859
4860         /* Check to see if the bond already exists. */
4861         if (name) {
4862                 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
4863                         if (strnicmp(bond->dev->name, name, IFNAMSIZ) == 0) {
4864                                 printk(KERN_ERR DRV_NAME
4865                                ": cannot add bond %s; it already exists\n",
4866                                        name);
4867                                 res = -EPERM;
4868                                 goto out_rtnl;
4869                         }
4870         }
4871
4872         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4873                                 ether_setup);
4874         if (!bond_dev) {
4875                 printk(KERN_ERR DRV_NAME
4876                        ": %s: eek! can't alloc netdev!\n",
4877                        name);
4878                 res = -ENOMEM;
4879                 goto out_rtnl;
4880         }
4881
4882         if (!name) {
4883                 res = dev_alloc_name(bond_dev, "bond%d");
4884                 if (res < 0)
4885                         goto out_netdev;
4886         }
4887
4888         /* bond_init() must be called after dev_alloc_name() (for the
4889          * /proc files), but before register_netdevice(), because we
4890          * need to set function pointers.
4891          */
4892
4893         res = bond_init(bond_dev, params);
4894         if (res < 0) {
4895                 goto out_netdev;
4896         }
4897
4898         res = register_netdevice(bond_dev);
4899         if (res < 0) {
4900                 goto out_bond;
4901         }
4902
4903         lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4904
4905         if (newbond)
4906                 *newbond = bond_dev->priv;
4907
4908         netif_carrier_off(bond_dev);
4909
4910         up_write(&bonding_rwsem);
4911         rtnl_unlock(); /* allows sysfs registration of net device */
4912         res = bond_create_sysfs_entry(bond_dev->priv);
4913         if (res < 0) {
4914                 rtnl_lock();
4915                 down_write(&bonding_rwsem);
4916                 bond_deinit(bond_dev);
4917                 unregister_netdevice(bond_dev);
4918                 goto out_rtnl;
4919         }
4920
4921         return 0;
4922
4923 out_bond:
4924         bond_deinit(bond_dev);
4925 out_netdev:
4926         free_netdev(bond_dev);
4927 out_rtnl:
4928         up_write(&bonding_rwsem);
4929         rtnl_unlock();
4930         return res;
4931 }
4932
4933 static int __init bonding_init(void)
4934 {
4935         int i;
4936         int res;
4937         struct bonding *bond, *nxt;
4938
4939         printk(KERN_INFO "%s", version);
4940
4941         res = bond_check_params(&bonding_defaults);
4942         if (res) {
4943                 goto out;
4944         }
4945
4946 #ifdef CONFIG_PROC_FS
4947         bond_create_proc_dir();
4948 #endif
4949
4950         init_rwsem(&bonding_rwsem);
4951
4952         for (i = 0; i < max_bonds; i++) {
4953                 res = bond_create(NULL, &bonding_defaults, NULL);
4954                 if (res)
4955                         goto err;
4956         }
4957
4958         res = bond_create_sysfs();
4959         if (res)
4960                 goto err;
4961
4962         register_netdevice_notifier(&bond_netdev_notifier);
4963         register_inetaddr_notifier(&bond_inetaddr_notifier);
4964
4965         goto out;
4966 err:
4967         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4968                 bond_work_cancel_all(bond);
4969                 destroy_workqueue(bond->wq);
4970         }
4971
4972         bond_destroy_sysfs();
4973
4974         rtnl_lock();
4975         bond_free_all();
4976         rtnl_unlock();
4977 out:
4978         return res;
4979
4980 }
4981
4982 static void __exit bonding_exit(void)
4983 {
4984         unregister_netdevice_notifier(&bond_netdev_notifier);
4985         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4986
4987         bond_destroy_sysfs();
4988
4989         rtnl_lock();
4990         bond_free_all();
4991         rtnl_unlock();
4992 }
4993
4994 module_init(bonding_init);
4995 module_exit(bonding_exit);
4996 MODULE_LICENSE("GPL");
4997 MODULE_VERSION(DRV_VERSION);
4998 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4999 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5000 MODULE_SUPPORTED_DEVICE("most ethernet devices");
5001
5002 /*
5003  * Local variables:
5004  *  c-indent-level: 8
5005  *  c-basic-offset: 8
5006  *  tab-width: 8
5007  * End:
5008  */
5009