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