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/sched.h>
  39 #include <linux/types.h>
  40 #include <linux/fcntl.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/ptrace.h>
  43 #include <linux/ioport.h>
  44 #include <linux/in.h>
  45 #include <net/ip.h>
  46 #include <linux/ip.h>
  47 #include <linux/tcp.h>
  48 #include <linux/udp.h>
  49 #include <linux/slab.h>
  50 #include <linux/string.h>
  51 #include <linux/init.h>
  52 #include <linux/timer.h>
  53 #include <linux/socket.h>
  54 #include <linux/ctype.h>
  55 #include <linux/inet.h>
  56 #include <linux/bitops.h>
  57 #include <asm/system.h>
  58 #include <asm/io.h>
  59 #include <asm/dma.h>
  60 #include <asm/uaccess.h>
  61 #include <linux/errno.h>
  62 #include <linux/netdevice.h>
  63 #include <linux/inetdevice.h>
  64 #include <linux/etherdevice.h>
  65 #include <linux/skbuff.h>
  66 #include <net/sock.h>
  67 #include <linux/rtnetlink.h>
  68 #include <linux/proc_fs.h>
  69 #include <linux/seq_file.h>
  70 #include <linux/smp.h>
  71 #include <linux/if_ether.h>
  72 #include <net/arp.h>
  73 #include <linux/mii.h>
  74 #include <linux/ethtool.h>
  75 #include <linux/if_vlan.h>
  76 #include <linux/if_bonding.h>
  77 #include <net/route.h>
  78 #include "bonding.h"
  79 #include "bond_3ad.h"
  80 #include "bond_alb.h"
  81
  82 /*---------------------------- Module parameters ----------------------------*/
  83
  84 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  85 #define BOND_LINK_MON_INTERV    0
  86 #define BOND_LINK_ARP_INTERV    0
  87
  88 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  89 static int miimon       = BOND_LINK_MON_INTERV;
  90 static int updelay      = 0;
  91 static int downdelay    = 0;
  92 static int use_carrier  = 1;
  93 static char *mode       = NULL;
  94 static char *primary    = NULL;
  95 static char *lacp_rate  = NULL;
  96 static char *xmit_hash_policy = NULL;
  97 static int arp_interval = BOND_LINK_ARP_INTERV;
  98 static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
  99 static char *arp_validate = NULL;
 100 struct bond_params bonding_defaults;
 101
 102 module_param(max_bonds, int, 0);
 103 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 104 module_param(miimon, int, 0);
 105 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 106 module_param(updelay, int, 0);
 107 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 108 module_param(downdelay, int, 0);
 109 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 110                             "in milliseconds");
 111 module_param(use_carrier, int, 0);
 112 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 113                               "0 for off, 1 for on (default)");
 114 module_param(mode, charp, 0);
 115 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 116                        "1 for active-backup, 2 for balance-xor, "
 117                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 118                        "6 for balance-alb");
 119 module_param(primary, charp, 0);
 120 MODULE_PARM_DESC(primary, "Primary network device to use");
 121 module_param(lacp_rate, charp, 0);
 122 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 123                             "(slow/fast)");
 124 module_param(xmit_hash_policy, charp, 0);
 125 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 126                                    ", 1 for layer 3+4");
 127 module_param(arp_interval, int, 0);
 128 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 129 module_param_array(arp_ip_target, charp, NULL, 0);
 130 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 131 module_param(arp_validate, charp, 0);
 132 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 133
 134 /*----------------------------- Global variables ----------------------------*/
 135
 136 static const char * const version =
 137         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 138
 139 LIST_HEAD(bond_dev_list);
 140
 141 #ifdef CONFIG_PROC_FS
 142 static struct proc_dir_entry *bond_proc_dir = NULL;
 143 #endif
 144
 145 extern struct rw_semaphore bonding_rwsem;
 146 static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
 147 static int arp_ip_count = 0;
 148 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 149 static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
 150 static int lacp_fast    = 0;
 151
 152
 153 struct bond_parm_tbl bond_lacp_tbl[] = {
 154 {       "slow",         AD_LACP_SLOW},
 155 {       "fast",         AD_LACP_FAST},
 156 {       NULL,           -1},
 157 };
 158
 159 struct bond_parm_tbl bond_mode_tbl[] = {
 160 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 161 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 162 {       "balance-xor",          BOND_MODE_XOR},
 163 {       "broadcast",            BOND_MODE_BROADCAST},
 164 {       "802.3ad",              BOND_MODE_8023AD},
 165 {       "balance-tlb",          BOND_MODE_TLB},
 166 {       "balance-alb",          BOND_MODE_ALB},
 167 {       NULL,                   -1},
 168 };
 169
 170 struct bond_parm_tbl xmit_hashtype_tbl[] = {
 171 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 172 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 173 {       NULL,                   -1},
 174 };
 175
 176 struct bond_parm_tbl arp_validate_tbl[] = {
 177 {       "none",                 BOND_ARP_VALIDATE_NONE},
 178 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 179 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 180 {       "all",                  BOND_ARP_VALIDATE_ALL},
 181 {       NULL,                   -1},
 182 };
 183
 184 /*-------------------------- Forward declarations ---------------------------*/
 185
 186 static void bond_send_gratuitous_arp(struct bonding *bond);
 187
 188 /*---------------------------- General routines -----------------------------*/
 189
 190 const char *bond_mode_name(int mode)
 191 {
 192         switch (mode) {
 193         case BOND_MODE_ROUNDROBIN :
 194                 return "load balancing (round-robin)";
 195         case BOND_MODE_ACTIVEBACKUP :
 196                 return "fault-tolerance (active-backup)";
 197         case BOND_MODE_XOR :
 198                 return "load balancing (xor)";
 199         case BOND_MODE_BROADCAST :
 200                 return "fault-tolerance (broadcast)";
 201         case BOND_MODE_8023AD:
 202                 return "IEEE 802.3ad Dynamic link aggregation";
 203         case BOND_MODE_TLB:
 204                 return "transmit load balancing";
 205         case BOND_MODE_ALB:
 206                 return "adaptive load balancing";
 207         default:
 208                 return "unknown";
 209         }
 210 }
 211
 212 /*---------------------------------- VLAN -----------------------------------*/
 213
 214 /**
 215  * bond_add_vlan - add a new vlan id on bond
 216  * @bond: bond that got the notification
 217  * @vlan_id: the vlan id to add
 218  *
 219  * Returns -ENOMEM if allocation failed.
 220  */
 221 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 222 {
 223         struct vlan_entry *vlan;
 224
 225         dprintk("bond: %s, vlan id %d\n",
 226                 (bond ? bond->dev->name: "None"), vlan_id);
 227
 228         vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 229         if (!vlan) {
 230                 return -ENOMEM;
 231         }
 232
 233         INIT_LIST_HEAD(&vlan->vlan_list);
 234         vlan->vlan_id = vlan_id;
 235         vlan->vlan_ip = 0;
 236
 237         write_lock_bh(&bond->lock);
 238
 239         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 240
 241         write_unlock_bh(&bond->lock);
 242
 243         dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 244
 245         return 0;
 246 }
 247
 248 /**
 249  * bond_del_vlan - delete a vlan id from bond
 250  * @bond: bond that got the notification
 251  * @vlan_id: the vlan id to delete
 252  *
 253  * returns -ENODEV if @vlan_id was not found in @bond.
 254  */
 255 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 256 {
 257         struct vlan_entry *vlan, *next;
 258         int res = -ENODEV;
 259
 260         dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 261
 262         write_lock_bh(&bond->lock);
 263
 264         list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
 265                 if (vlan->vlan_id == vlan_id) {
 266                         list_del(&vlan->vlan_list);
 267
 268                         if ((bond->params.mode == BOND_MODE_TLB) ||
 269                             (bond->params.mode == BOND_MODE_ALB)) {
 270                                 bond_alb_clear_vlan(bond, vlan_id);
 271                         }
 272
 273                         dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
 274                                 bond->dev->name);
 275
 276                         kfree(vlan);
 277
 278                         if (list_empty(&bond->vlan_list) &&
 279                             (bond->slave_cnt == 0)) {
 280                                 /* Last VLAN removed and no slaves, so
 281                                  * restore block on adding VLANs. This will
 282                                  * be removed once new slaves that are not
 283                                  * VLAN challenged will be added.
 284                                  */
 285                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 286                         }
 287
 288                         res = 0;
 289                         goto out;
 290                 }
 291         }
 292
 293         dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
 294                 bond->dev->name);
 295
 296 out:
 297         write_unlock_bh(&bond->lock);
 298         return res;
 299 }
 300
 301 /**
 302  * bond_has_challenged_slaves
 303  * @bond: the bond we're working on
 304  *
 305  * Searches the slave list. Returns 1 if a vlan challenged slave
 306  * was found, 0 otherwise.
 307  *
 308  * Assumes bond->lock is held.
 309  */
 310 static int bond_has_challenged_slaves(struct bonding *bond)
 311 {
 312         struct slave *slave;
 313         int i;
 314
 315         bond_for_each_slave(bond, slave, i) {
 316                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 317                         dprintk("found VLAN challenged slave - %s\n",
 318                                 slave->dev->name);
 319                         return 1;
 320                 }
 321         }
 322
 323         dprintk("no VLAN challenged slaves found\n");
 324         return 0;
 325 }
 326
 327 /**
 328  * bond_next_vlan - safely skip to the next item in the vlans list.
 329  * @bond: the bond we're working on
 330  * @curr: item we're advancing from
 331  *
 332  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 333  * or @curr->next otherwise (even if it is @curr itself again).
 334  *
 335  * Caller must hold bond->lock
 336  */
 337 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 338 {
 339         struct vlan_entry *next, *last;
 340
 341         if (list_empty(&bond->vlan_list)) {
 342                 return NULL;
 343         }
 344
 345         if (!curr) {
 346                 next = list_entry(bond->vlan_list.next,
 347                                   struct vlan_entry, vlan_list);
 348         } else {
 349                 last = list_entry(bond->vlan_list.prev,
 350                                   struct vlan_entry, vlan_list);
 351                 if (last == curr) {
 352                         next = list_entry(bond->vlan_list.next,
 353                                           struct vlan_entry, vlan_list);
 354                 } else {
 355                         next = list_entry(curr->vlan_list.next,
 356                                           struct vlan_entry, vlan_list);
 357                 }
 358         }
 359
 360         return next;
 361 }
 362
 363 /**
 364  * bond_dev_queue_xmit - Prepare skb for xmit.
 365  *
 366  * @bond: bond device that got this skb for tx.
 367  * @skb: hw accel VLAN tagged skb to transmit
 368  * @slave_dev: slave that is supposed to xmit this skbuff
 369  *
 370  * When the bond gets an skb to transmit that is
 371  * already hardware accelerated VLAN tagged, and it
 372  * needs to relay this skb to a slave that is not
 373  * hw accel capable, the skb needs to be "unaccelerated",
 374  * i.e. strip the hwaccel tag and re-insert it as part
 375  * of the payload.
 376  */
 377 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
 378 {
 379         unsigned short vlan_id;
 380
 381         if (!list_empty(&bond->vlan_list) &&
 382             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 383             vlan_get_tag(skb, &vlan_id) == 0) {
 384                 skb->dev = slave_dev;
 385                 skb = vlan_put_tag(skb, vlan_id);
 386                 if (!skb) {
 387                         /* vlan_put_tag() frees the skb in case of error,
 388                          * so return success here so the calling functions
 389                          * won't attempt to free is again.
 390                          */
 391                         return 0;
 392                 }
 393         } else {
 394                 skb->dev = slave_dev;
 395         }
 396
 397         skb->priority = 1;
 398         dev_queue_xmit(skb);
 399
 400         return 0;
 401 }
 402
 403 /*
 404  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 405  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 406  * lock because:
 407  * a. This operation is performed in IOCTL context,
 408  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 409  * c. Holding a lock with BH disabled while directly calling a base driver
 410  *    entry point is generally a BAD idea.
 411  *
 412  * The design of synchronization/protection for this operation in the 8021q
 413  * module is good for one or more VLAN devices over a single physical device
 414  * and cannot be extended for a teaming solution like bonding, so there is a
 415  * potential race condition here where a net device from the vlan group might
 416  * be referenced (either by a base driver or the 8021q code) while it is being
 417  * removed from the system. However, it turns out we're not making matters
 418  * worse, and if it works for regular VLAN usage it will work here too.
 419 */
 420
 421 /**
 422  * bond_vlan_rx_register - Propagates registration to slaves
 423  * @bond_dev: bonding net device that got called
 424  * @grp: vlan group being registered
 425  */
 426 static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
 427 {
 428         struct bonding *bond = bond_dev->priv;
 429         struct slave *slave;
 430         int i;
 431
 432         bond->vlgrp = grp;
 433
 434         bond_for_each_slave(bond, slave, i) {
 435                 struct net_device *slave_dev = slave->dev;
 436
 437                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 438                     slave_dev->vlan_rx_register) {
 439                         slave_dev->vlan_rx_register(slave_dev, grp);
 440                 }
 441         }
 442 }
 443
 444 /**
 445  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 446  * @bond_dev: bonding net device that got called
 447  * @vid: vlan id being added
 448  */
 449 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 450 {
 451         struct bonding *bond = bond_dev->priv;
 452         struct slave *slave;
 453         int i, res;
 454
 455         bond_for_each_slave(bond, slave, i) {
 456                 struct net_device *slave_dev = slave->dev;
 457
 458                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 459                     slave_dev->vlan_rx_add_vid) {
 460                         slave_dev->vlan_rx_add_vid(slave_dev, vid);
 461                 }
 462         }
 463
 464         res = bond_add_vlan(bond, vid);
 465         if (res) {
 466                 printk(KERN_ERR DRV_NAME
 467                        ": %s: Error: Failed to add vlan id %d\n",
 468                        bond_dev->name, vid);
 469         }
 470 }
 471
 472 /**
 473  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 474  * @bond_dev: bonding net device that got called
 475  * @vid: vlan id being removed
 476  */
 477 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 478 {
 479         struct bonding *bond = bond_dev->priv;
 480         struct slave *slave;
 481         struct net_device *vlan_dev;
 482         int i, res;
 483
 484         bond_for_each_slave(bond, slave, i) {
 485                 struct net_device *slave_dev = slave->dev;
 486
 487                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 488                     slave_dev->vlan_rx_kill_vid) {
 489                         /* Save and then restore vlan_dev in the grp array,
 490                          * since the slave's driver might clear it.
 491                          */
 492                         vlan_dev = bond->vlgrp->vlan_devices[vid];
 493                         slave_dev->vlan_rx_kill_vid(slave_dev, vid);
 494                         bond->vlgrp->vlan_devices[vid] = vlan_dev;
 495                 }
 496         }
 497
 498         res = bond_del_vlan(bond, vid);
 499         if (res) {
 500                 printk(KERN_ERR DRV_NAME
 501                        ": %s: Error: Failed to remove vlan id %d\n",
 502                        bond_dev->name, vid);
 503         }
 504 }
 505
 506 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 507 {
 508         struct vlan_entry *vlan;
 509
 510         write_lock_bh(&bond->lock);
 511
 512         if (list_empty(&bond->vlan_list)) {
 513                 goto out;
 514         }
 515
 516         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 517             slave_dev->vlan_rx_register) {
 518                 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
 519         }
 520
 521         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 522             !(slave_dev->vlan_rx_add_vid)) {
 523                 goto out;
 524         }
 525
 526         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 527                 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 528         }
 529
 530 out:
 531         write_unlock_bh(&bond->lock);
 532 }
 533
 534 static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
 535 {
 536         struct vlan_entry *vlan;
 537         struct net_device *vlan_dev;
 538
 539         write_lock_bh(&bond->lock);
 540
 541         if (list_empty(&bond->vlan_list)) {
 542                 goto out;
 543         }
 544
 545         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 546             !(slave_dev->vlan_rx_kill_vid)) {
 547                 goto unreg;
 548         }
 549
 550         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 551                 /* Save and then restore vlan_dev in the grp array,
 552                  * since the slave's driver might clear it.
 553                  */
 554                 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
 555                 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 556                 bond->vlgrp->vlan_devices[vlan->vlan_id] = vlan_dev;
 557         }
 558
 559 unreg:
 560         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 561             slave_dev->vlan_rx_register) {
 562                 slave_dev->vlan_rx_register(slave_dev, NULL);
 563         }
 564
 565 out:
 566         write_unlock_bh(&bond->lock);
 567 }
 568
 569 /*------------------------------- Link status -------------------------------*/
 570
 571 /*
 572  * Set the carrier state for the master according to the state of its
 573  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 574  * do special 802.3ad magic.
 575  *
 576  * Returns zero if carrier state does not change, nonzero if it does.
 577  */
 578 static int bond_set_carrier(struct bonding *bond)
 579 {
 580         struct slave *slave;
 581         int i;
 582
 583         if (bond->slave_cnt == 0)
 584                 goto down;
 585
 586         if (bond->params.mode == BOND_MODE_8023AD)
 587                 return bond_3ad_set_carrier(bond);
 588
 589         bond_for_each_slave(bond, slave, i) {
 590                 if (slave->link == BOND_LINK_UP) {
 591                         if (!netif_carrier_ok(bond->dev)) {
 592                                 netif_carrier_on(bond->dev);
 593                                 return 1;
 594                         }
 595                         return 0;
 596                 }
 597         }
 598
 599 down:
 600         if (netif_carrier_ok(bond->dev)) {
 601                 netif_carrier_off(bond->dev);
 602                 return 1;
 603         }
 604         return 0;
 605 }
 606
 607 /*
 608  * Get link speed and duplex from the slave's base driver
 609  * using ethtool. If for some reason the call fails or the
 610  * values are invalid, fake speed and duplex to 100/Full
 611  * and return error.
 612  */
 613 static int bond_update_speed_duplex(struct slave *slave)
 614 {
 615         struct net_device *slave_dev = slave->dev;
 616         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 617         struct ifreq ifr;
 618         struct ethtool_cmd etool;
 619
 620         /* Fake speed and duplex */
 621         slave->speed = SPEED_100;
 622         slave->duplex = DUPLEX_FULL;
 623
 624         if (slave_dev->ethtool_ops) {
 625                 int res;
 626
 627                 if (!slave_dev->ethtool_ops->get_settings) {
 628                         return -1;
 629                 }
 630
 631                 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 632                 if (res < 0) {
 633                         return -1;
 634                 }
 635
 636                 goto verify;
 637         }
 638
 639         ioctl = slave_dev->do_ioctl;
 640         strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 641         etool.cmd = ETHTOOL_GSET;
 642         ifr.ifr_data = (char*)&etool;
 643         if (!ioctl || (IOCTL(slave_dev, &ifr, SIOCETHTOOL) < 0)) {
 644                 return -1;
 645         }
 646
 647 verify:
 648         switch (etool.speed) {
 649         case SPEED_10:
 650         case SPEED_100:
 651         case SPEED_1000:
 652         case SPEED_10000:
 653                 break;
 654         default:
 655                 return -1;
 656         }
 657
 658         switch (etool.duplex) {
 659         case DUPLEX_FULL:
 660         case DUPLEX_HALF:
 661                 break;
 662         default:
 663                 return -1;
 664         }
 665
 666         slave->speed = etool.speed;
 667         slave->duplex = etool.duplex;
 668
 669         return 0;
 670 }
 671
 672 /*
 673  * if <dev> supports MII link status reporting, check its link status.
 674  *
 675  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 676  * depening upon the setting of the use_carrier parameter.
 677  *
 678  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 679  * can't tell and just pretend it is), or 0, meaning that the link is
 680  * down.
 681  *
 682  * If reporting is non-zero, instead of faking link up, return -1 if
 683  * both ETHTOOL and MII ioctls fail (meaning the device does not
 684  * support them).  If use_carrier is set, return whatever it says.
 685  * It'd be nice if there was a good way to tell if a driver supports
 686  * netif_carrier, but there really isn't.
 687  */
 688 static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
 689 {
 690         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 691         struct ifreq ifr;
 692         struct mii_ioctl_data *mii;
 693         struct ethtool_value etool;
 694
 695         if (bond->params.use_carrier) {
 696                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 697         }
 698
 699         ioctl = slave_dev->do_ioctl;
 700         if (ioctl) {
 701                 /* TODO: set pointer to correct ioctl on a per team member */
 702                 /*       bases to make this more efficient. that is, once  */
 703                 /*       we determine the correct ioctl, we will always    */
 704                 /*       call it and not the others for that team          */
 705                 /*       member.                                           */
 706
 707                 /*
 708                  * We cannot assume that SIOCGMIIPHY will also read a
 709                  * register; not all network drivers (e.g., e100)
 710                  * support that.
 711                  */
 712
 713                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 714                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 715                 mii = if_mii(&ifr);
 716                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 717                         mii->reg_num = MII_BMSR;
 718                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
 719                                 return (mii->val_out & BMSR_LSTATUS);
 720                         }
 721                 }
 722         }
 723
 724         /* try SIOCETHTOOL ioctl, some drivers cache ETHTOOL_GLINK */
 725         /* for a period of time so we attempt to get link status   */
 726         /* from it last if the above MII ioctls fail...            */
 727         if (slave_dev->ethtool_ops) {
 728                 if (slave_dev->ethtool_ops->get_link) {
 729                         u32 link;
 730
 731                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 732
 733                         return link ? BMSR_LSTATUS : 0;
 734                 }
 735         }
 736
 737         if (ioctl) {
 738                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 739                 etool.cmd = ETHTOOL_GLINK;
 740                 ifr.ifr_data = (char*)&etool;
 741                 if (IOCTL(slave_dev, &ifr, SIOCETHTOOL) == 0) {
 742                         if (etool.data == 1) {
 743                                 return BMSR_LSTATUS;
 744                         } else {
 745                                 dprintk("SIOCETHTOOL shows link down\n");
 746                                 return 0;
 747                         }
 748                 }
 749         }
 750
 751         /*
 752          * If reporting, report that either there's no dev->do_ioctl,
 753          * or both SIOCGMIIREG and SIOCETHTOOL failed (meaning that we
 754          * cannot report link status).  If not reporting, pretend
 755          * we're ok.
 756          */
 757         return (reporting ? -1 : BMSR_LSTATUS);
 758 }
 759
 760 /*----------------------------- Multicast list ------------------------------*/
 761
 762 /*
 763  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
 764  */
 765 static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
 766 {
 767         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
 768                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
 769 }
 770
 771 /*
 772  * returns dmi entry if found, NULL otherwise
 773  */
 774 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
 775 {
 776         struct dev_mc_list *idmi;
 777
 778         for (idmi = mc_list; idmi; idmi = idmi->next) {
 779                 if (bond_is_dmi_same(dmi, idmi)) {
 780                         return idmi;
 781                 }
 782         }
 783
 784         return NULL;
 785 }
 786
 787 /*
 788  * Push the promiscuity flag down to appropriate slaves
 789  */
 790 static void bond_set_promiscuity(struct bonding *bond, int inc)
 791 {
 792         if (USES_PRIMARY(bond->params.mode)) {
 793                 /* write lock already acquired */
 794                 if (bond->curr_active_slave) {
 795                         dev_set_promiscuity(bond->curr_active_slave->dev, inc);
 796                 }
 797         } else {
 798                 struct slave *slave;
 799                 int i;
 800                 bond_for_each_slave(bond, slave, i) {
 801                         dev_set_promiscuity(slave->dev, inc);
 802                 }
 803         }
 804 }
 805
 806 /*
 807  * Push the allmulti flag down to all slaves
 808  */
 809 static void bond_set_allmulti(struct bonding *bond, int inc)
 810 {
 811         if (USES_PRIMARY(bond->params.mode)) {
 812                 /* write lock already acquired */
 813                 if (bond->curr_active_slave) {
 814                         dev_set_allmulti(bond->curr_active_slave->dev, inc);
 815                 }
 816         } else {
 817                 struct slave *slave;
 818                 int i;
 819                 bond_for_each_slave(bond, slave, i) {
 820                         dev_set_allmulti(slave->dev, inc);
 821                 }
 822         }
 823 }
 824
 825 /*
 826  * Add a Multicast address to slaves
 827  * according to mode
 828  */
 829 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
 830 {
 831         if (USES_PRIMARY(bond->params.mode)) {
 832                 /* write lock already acquired */
 833                 if (bond->curr_active_slave) {
 834                         dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
 835                 }
 836         } else {
 837                 struct slave *slave;
 838                 int i;
 839                 bond_for_each_slave(bond, slave, i) {
 840                         dev_mc_add(slave->dev, addr, alen, 0);
 841                 }
 842         }
 843 }
 844
 845 /*
 846  * Remove a multicast address from slave
 847  * according to mode
 848  */
 849 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
 850 {
 851         if (USES_PRIMARY(bond->params.mode)) {
 852                 /* write lock already acquired */
 853                 if (bond->curr_active_slave) {
 854                         dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
 855                 }
 856         } else {
 857                 struct slave *slave;
 858                 int i;
 859                 bond_for_each_slave(bond, slave, i) {
 860                         dev_mc_delete(slave->dev, addr, alen, 0);
 861                 }
 862         }
 863 }
 864
 865 /*
 866  * Totally destroys the mc_list in bond
 867  */
 868 static void bond_mc_list_destroy(struct bonding *bond)
 869 {
 870         struct dev_mc_list *dmi;
 871
 872         dmi = bond->mc_list;
 873         while (dmi) {
 874                 bond->mc_list = dmi->next;
 875                 kfree(dmi);
 876                 dmi = bond->mc_list;
 877         }
 878 }
 879
 880 /*
 881  * Copy all the Multicast addresses from src to the bonding device dst
 882  */
 883 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
 884                              gfp_t gfp_flag)
 885 {
 886         struct dev_mc_list *dmi, *new_dmi;
 887
 888         for (dmi = mc_list; dmi; dmi = dmi->next) {
 889                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
 890
 891                 if (!new_dmi) {
 892                         /* FIXME: Potential memory leak !!! */
 893                         return -ENOMEM;
 894                 }
 895
 896                 new_dmi->next = bond->mc_list;
 897                 bond->mc_list = new_dmi;
 898                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
 899                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
 900                 new_dmi->dmi_users = dmi->dmi_users;
 901                 new_dmi->dmi_gusers = dmi->dmi_gusers;
 902         }
 903
 904         return 0;
 905 }
 906
 907 /*
 908  * flush all members of flush->mc_list from device dev->mc_list
 909  */
 910 static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
 911 {
 912         struct bonding *bond = bond_dev->priv;
 913         struct dev_mc_list *dmi;
 914
 915         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
 916                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 917         }
 918
 919         if (bond->params.mode == BOND_MODE_8023AD) {
 920                 /* del lacpdu mc addr from mc list */
 921                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 922
 923                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
 924         }
 925 }
 926
 927 /*--------------------------- Active slave change ---------------------------*/
 928
 929 /*
 930  * Update the mc list and multicast-related flags for the new and
 931  * old active slaves (if any) according to the multicast mode, and
 932  * promiscuous flags unconditionally.
 933  */
 934 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
 935 {
 936         struct dev_mc_list *dmi;
 937
 938         if (!USES_PRIMARY(bond->params.mode)) {
 939                 /* nothing to do -  mc list is already up-to-date on
 940                  * all slaves
 941                  */
 942                 return;
 943         }
 944
 945         if (old_active) {
 946                 if (bond->dev->flags & IFF_PROMISC) {
 947                         dev_set_promiscuity(old_active->dev, -1);
 948                 }
 949
 950                 if (bond->dev->flags & IFF_ALLMULTI) {
 951                         dev_set_allmulti(old_active->dev, -1);
 952                 }
 953
 954                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 955                         dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 956                 }
 957         }
 958
 959         if (new_active) {
 960                 if (bond->dev->flags & IFF_PROMISC) {
 961                         dev_set_promiscuity(new_active->dev, 1);
 962                 }
 963
 964                 if (bond->dev->flags & IFF_ALLMULTI) {
 965                         dev_set_allmulti(new_active->dev, 1);
 966                 }
 967
 968                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 969                         dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 970                 }
 971         }
 972 }
 973
 974 /**
 975  * find_best_interface - select the best available slave to be the active one
 976  * @bond: our bonding struct
 977  *
 978  * Warning: Caller must hold curr_slave_lock for writing.
 979  */
 980 static struct slave *bond_find_best_slave(struct bonding *bond)
 981 {
 982         struct slave *new_active, *old_active;
 983         struct slave *bestslave = NULL;
 984         int mintime = bond->params.updelay;
 985         int i;
 986
 987         new_active = old_active = bond->curr_active_slave;
 988
 989         if (!new_active) { /* there were no active slaves left */
 990                 if (bond->slave_cnt > 0) {  /* found one slave */
 991                         new_active = bond->first_slave;
 992                 } else {
 993                         return NULL; /* still no slave, return NULL */
 994                 }
 995         }
 996
 997         /* first try the primary link; if arping, a link must tx/rx traffic
 998          * before it can be considered the curr_active_slave - also, we would skip
 999          * slaves between the curr_active_slave and primary_slave that may be up
1000          * and able to arp
1001          */
1002         if ((bond->primary_slave) &&
1003             (!bond->params.arp_interval) &&
1004             (IS_UP(bond->primary_slave->dev))) {
1005                 new_active = bond->primary_slave;
1006         }
1007
1008         /* remember where to stop iterating over the slaves */
1009         old_active = new_active;
1010
1011         bond_for_each_slave_from(bond, new_active, i, old_active) {
1012                 if (IS_UP(new_active->dev)) {
1013                         if (new_active->link == BOND_LINK_UP) {
1014                                 return new_active;
1015                         } else if (new_active->link == BOND_LINK_BACK) {
1016                                 /* link up, but waiting for stabilization */
1017                                 if (new_active->delay < mintime) {
1018                                         mintime = new_active->delay;
1019                                         bestslave = new_active;
1020                                 }
1021                         }
1022                 }
1023         }
1024
1025         return bestslave;
1026 }
1027
1028 /**
1029  * change_active_interface - change the active slave into the specified one
1030  * @bond: our bonding struct
1031  * @new: the new slave to make the active one
1032  *
1033  * Set the new slave to the bond's settings and unset them on the old
1034  * curr_active_slave.
1035  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1036  *
1037  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1038  * because it is apparently the best available slave we have, even though its
1039  * updelay hasn't timed out yet.
1040  *
1041  * Warning: Caller must hold curr_slave_lock for writing.
1042  */
1043 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1044 {
1045         struct slave *old_active = bond->curr_active_slave;
1046
1047         if (old_active == new_active) {
1048                 return;
1049         }
1050
1051         if (new_active) {
1052                 if (new_active->link == BOND_LINK_BACK) {
1053                         if (USES_PRIMARY(bond->params.mode)) {
1054                                 printk(KERN_INFO DRV_NAME
1055                                        ": %s: making interface %s the new "
1056                                        "active one %d ms earlier.\n",
1057                                        bond->dev->name, new_active->dev->name,
1058                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1059                         }
1060
1061                         new_active->delay = 0;
1062                         new_active->link = BOND_LINK_UP;
1063                         new_active->jiffies = jiffies;
1064
1065                         if (bond->params.mode == BOND_MODE_8023AD) {
1066                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1067                         }
1068
1069                         if ((bond->params.mode == BOND_MODE_TLB) ||
1070                             (bond->params.mode == BOND_MODE_ALB)) {
1071                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1072                         }
1073                 } else {
1074                         if (USES_PRIMARY(bond->params.mode)) {
1075                                 printk(KERN_INFO DRV_NAME
1076                                        ": %s: making interface %s the new "
1077                                        "active one.\n",
1078                                        bond->dev->name, new_active->dev->name);
1079                         }
1080                 }
1081         }
1082
1083         if (USES_PRIMARY(bond->params.mode)) {
1084                 bond_mc_swap(bond, new_active, old_active);
1085         }
1086
1087         if ((bond->params.mode == BOND_MODE_TLB) ||
1088             (bond->params.mode == BOND_MODE_ALB)) {
1089                 bond_alb_handle_active_change(bond, new_active);
1090                 if (old_active)
1091                         bond_set_slave_inactive_flags(old_active);
1092                 if (new_active)
1093                         bond_set_slave_active_flags(new_active);
1094         } else {
1095                 bond->curr_active_slave = new_active;
1096         }
1097
1098         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1099                 if (old_active) {
1100                         bond_set_slave_inactive_flags(old_active);
1101                 }
1102
1103                 if (new_active) {
1104                         bond_set_slave_active_flags(new_active);
1105                 }
1106                 bond_send_gratuitous_arp(bond);
1107         }
1108 }
1109
1110 /**
1111  * bond_select_active_slave - select a new active slave, if needed
1112  * @bond: our bonding struct
1113  *
1114  * This functions shoud be called when one of the following occurs:
1115  * - The old curr_active_slave has been released or lost its link.
1116  * - The primary_slave has got its link back.
1117  * - A slave has got its link back and there's no old curr_active_slave.
1118  *
1119  * Warning: Caller must hold curr_slave_lock for writing.
1120  */
1121 void bond_select_active_slave(struct bonding *bond)
1122 {
1123         struct slave *best_slave;
1124         int rv;
1125
1126         best_slave = bond_find_best_slave(bond);
1127         if (best_slave != bond->curr_active_slave) {
1128                 bond_change_active_slave(bond, best_slave);
1129                 rv = bond_set_carrier(bond);
1130                 if (!rv)
1131                         return;
1132
1133                 if (netif_carrier_ok(bond->dev)) {
1134                         printk(KERN_INFO DRV_NAME
1135                                ": %s: first active interface up!\n",
1136                                bond->dev->name);
1137                 } else {
1138                         printk(KERN_INFO DRV_NAME ": %s: "
1139                                "now running without any active interface !\n",
1140                                bond->dev->name);
1141                 }
1142         }
1143 }
1144
1145 /*--------------------------- slave list handling ---------------------------*/
1146
1147 /*
1148  * This function attaches the slave to the end of list.
1149  *
1150  * bond->lock held for writing by caller.
1151  */
1152 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1153 {
1154         if (bond->first_slave == NULL) { /* attaching the first slave */
1155                 new_slave->next = new_slave;
1156                 new_slave->prev = new_slave;
1157                 bond->first_slave = new_slave;
1158         } else {
1159                 new_slave->next = bond->first_slave;
1160                 new_slave->prev = bond->first_slave->prev;
1161                 new_slave->next->prev = new_slave;
1162                 new_slave->prev->next = new_slave;
1163         }
1164
1165         bond->slave_cnt++;
1166 }
1167
1168 /*
1169  * This function detaches the slave from the list.
1170  * WARNING: no check is made to verify if the slave effectively
1171  * belongs to <bond>.
1172  * Nothing is freed on return, structures are just unchained.
1173  * If any slave pointer in bond was pointing to <slave>,
1174  * it should be changed by the calling function.
1175  *
1176  * bond->lock held for writing by caller.
1177  */
1178 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1179 {
1180         if (slave->next) {
1181                 slave->next->prev = slave->prev;
1182         }
1183
1184         if (slave->prev) {
1185                 slave->prev->next = slave->next;
1186         }
1187
1188         if (bond->first_slave == slave) { /* slave is the first slave */
1189                 if (bond->slave_cnt > 1) { /* there are more slave */
1190                         bond->first_slave = slave->next;
1191                 } else {
1192                         bond->first_slave = NULL; /* slave was the last one */
1193                 }
1194         }
1195
1196         slave->next = NULL;
1197         slave->prev = NULL;
1198         bond->slave_cnt--;
1199 }
1200
1201 /*---------------------------------- IOCTL ----------------------------------*/
1202
1203 int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev)
1204 {
1205         dprintk("bond_dev=%p\n", bond_dev);
1206         dprintk("slave_dev=%p\n", slave_dev);
1207         dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1208         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1209         return 0;
1210 }
1211
1212 #define BOND_INTERSECT_FEATURES \
1213         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_TSO | NETIF_F_UFO)
1214
1215 /*
1216  * Compute the common dev->feature set available to all slaves.  Some
1217  * feature bits are managed elsewhere, so preserve feature bits set on
1218  * master device that are not part of the examined set.
1219  */
1220 static int bond_compute_features(struct bonding *bond)
1221 {
1222         unsigned long features = BOND_INTERSECT_FEATURES;
1223         struct slave *slave;
1224         struct net_device *bond_dev = bond->dev;
1225         unsigned short max_hard_header_len = ETH_HLEN;
1226         int i;
1227
1228         bond_for_each_slave(bond, slave, i) {
1229                 features &= (slave->dev->features & BOND_INTERSECT_FEATURES);
1230                 if (slave->dev->hard_header_len > max_hard_header_len)
1231                         max_hard_header_len = slave->dev->hard_header_len;
1232         }
1233
1234         if ((features & NETIF_F_SG) &&
1235             !(features & NETIF_F_ALL_CSUM))
1236                 features &= ~NETIF_F_SG;
1237
1238         /*
1239          * features will include NETIF_F_TSO (NETIF_F_UFO) iff all
1240          * slave devices support NETIF_F_TSO (NETIF_F_UFO), which
1241          * implies that all slaves also support scatter-gather
1242          * (NETIF_F_SG), which implies that features also includes
1243          * NETIF_F_SG. So no need to check whether we have an
1244          * illegal combination of NETIF_F_{TSO,UFO} and
1245          * !NETIF_F_SG
1246          */
1247
1248         features |= (bond_dev->features & ~BOND_INTERSECT_FEATURES);
1249         bond_dev->features = features;
1250         bond_dev->hard_header_len = max_hard_header_len;
1251
1252         return 0;
1253 }
1254
1255 /* enslave device <slave> to bond device <master> */
1256 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1257 {
1258         struct bonding *bond = bond_dev->priv;
1259         struct slave *new_slave = NULL;
1260         struct dev_mc_list *dmi;
1261         struct sockaddr addr;
1262         int link_reporting;
1263         int old_features = bond_dev->features;
1264         int res = 0;
1265
1266         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1267                 slave_dev->do_ioctl == NULL) {
1268                 printk(KERN_WARNING DRV_NAME
1269                        ": %s: Warning: no link monitoring support for %s\n",
1270                        bond_dev->name, slave_dev->name);
1271         }
1272
1273         /* bond must be initialized by bond_open() before enslaving */
1274         if (!(bond_dev->flags & IFF_UP)) {
1275                 dprintk("Error, master_dev is not up\n");
1276                 return -EPERM;
1277         }
1278
1279         /* already enslaved */
1280         if (slave_dev->flags & IFF_SLAVE) {
1281                 dprintk("Error, Device was already enslaved\n");
1282                 return -EBUSY;
1283         }
1284
1285         /* vlan challenged mutual exclusion */
1286         /* no need to lock since we're protected by rtnl_lock */
1287         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1288                 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1289                 if (!list_empty(&bond->vlan_list)) {
1290                         printk(KERN_ERR DRV_NAME
1291                                ": %s: Error: cannot enslave VLAN "
1292                                "challenged slave %s on VLAN enabled "
1293                                "bond %s\n", bond_dev->name, slave_dev->name,
1294                                bond_dev->name);
1295                         return -EPERM;
1296                 } else {
1297                         printk(KERN_WARNING DRV_NAME
1298                                ": %s: Warning: enslaved VLAN challenged "
1299                                "slave %s. Adding VLANs will be blocked as "
1300                                "long as %s is part of bond %s\n",
1301                                bond_dev->name, slave_dev->name, slave_dev->name,
1302                                bond_dev->name);
1303                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1304                 }
1305         } else {
1306                 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1307                 if (bond->slave_cnt == 0) {
1308                         /* First slave, and it is not VLAN challenged,
1309                          * so remove the block of adding VLANs over the bond.
1310                          */
1311                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1312                 }
1313         }
1314
1315         /*
1316          * Old ifenslave binaries are no longer supported.  These can
1317          * be identified with moderate accurary by the state of the slave:
1318          * the current ifenslave will set the interface down prior to
1319          * enslaving it; the old ifenslave will not.
1320          */
1321         if ((slave_dev->flags & IFF_UP)) {
1322                 printk(KERN_ERR DRV_NAME ": %s is up. "
1323                        "This may be due to an out of date ifenslave.\n",
1324                        slave_dev->name);
1325                 res = -EPERM;
1326                 goto err_undo_flags;
1327         }
1328
1329         if (slave_dev->set_mac_address == NULL) {
1330                 printk(KERN_ERR DRV_NAME
1331                         ": %s: Error: The slave device you specified does "
1332                         "not support setting the MAC address. "
1333                         "Your kernel likely does not support slave "
1334                         "devices.\n", bond_dev->name);
1335                 res = -EOPNOTSUPP;
1336                 goto err_undo_flags;
1337         }
1338
1339         if (slave_dev->get_stats == NULL) {
1340                 printk(KERN_NOTICE DRV_NAME
1341                         ": %s: the driver for slave device %s does not provide "
1342                         "get_stats function, network statistics will be "
1343                         "inaccurate.\n", bond_dev->name, slave_dev->name);
1344         }
1345
1346         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1347         if (!new_slave) {
1348                 res = -ENOMEM;
1349                 goto err_undo_flags;
1350         }
1351
1352         /* save slave's original flags before calling
1353          * netdev_set_master and dev_open
1354          */
1355         new_slave->original_flags = slave_dev->flags;
1356
1357         /*
1358          * Save slave's original ("permanent") mac address for modes
1359          * that need it, and for restoring it upon release, and then
1360          * set it to the master's address
1361          */
1362         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1363
1364         /*
1365          * Set slave to master's mac address.  The application already
1366          * set the master's mac address to that of the first slave
1367          */
1368         memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1369         addr.sa_family = slave_dev->type;
1370         res = dev_set_mac_address(slave_dev, &addr);
1371         if (res) {
1372                 dprintk("Error %d calling set_mac_address\n", res);
1373                 goto err_free;
1374         }
1375
1376         /* open the slave since the application closed it */
1377         res = dev_open(slave_dev);
1378         if (res) {
1379                 dprintk("Openning slave %s failed\n", slave_dev->name);
1380                 goto err_restore_mac;
1381         }
1382
1383         res = netdev_set_master(slave_dev, bond_dev);
1384         if (res) {
1385                 dprintk("Error %d calling netdev_set_master\n", res);
1386                 goto err_close;
1387         }
1388
1389         new_slave->dev = slave_dev;
1390         slave_dev->priv_flags |= IFF_BONDING;
1391
1392         if ((bond->params.mode == BOND_MODE_TLB) ||
1393             (bond->params.mode == BOND_MODE_ALB)) {
1394                 /* bond_alb_init_slave() must be called before all other stages since
1395                  * it might fail and we do not want to have to undo everything
1396                  */
1397                 res = bond_alb_init_slave(bond, new_slave);
1398                 if (res) {
1399                         goto err_unset_master;
1400                 }
1401         }
1402
1403         /* If the mode USES_PRIMARY, then the new slave gets the
1404          * master's promisc (and mc) settings only if it becomes the
1405          * curr_active_slave, and that is taken care of later when calling
1406          * bond_change_active()
1407          */
1408         if (!USES_PRIMARY(bond->params.mode)) {
1409                 /* set promiscuity level to new slave */
1410                 if (bond_dev->flags & IFF_PROMISC) {
1411                         dev_set_promiscuity(slave_dev, 1);
1412                 }
1413
1414                 /* set allmulti level to new slave */
1415                 if (bond_dev->flags & IFF_ALLMULTI) {
1416                         dev_set_allmulti(slave_dev, 1);
1417                 }
1418
1419                 /* upload master's mc_list to new slave */
1420                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1421                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1422                 }
1423         }
1424
1425         if (bond->params.mode == BOND_MODE_8023AD) {
1426                 /* add lacpdu mc addr to mc list */
1427                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1428
1429                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1430         }
1431
1432         bond_add_vlans_on_slave(bond, slave_dev);
1433
1434         write_lock_bh(&bond->lock);
1435
1436         bond_attach_slave(bond, new_slave);
1437
1438         new_slave->delay = 0;
1439         new_slave->link_failure_count = 0;
1440
1441         bond_compute_features(bond);
1442
1443         new_slave->last_arp_rx = jiffies;
1444
1445         if (bond->params.miimon && !bond->params.use_carrier) {
1446                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1447
1448                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1449                         /*
1450                          * miimon is set but a bonded network driver
1451                          * does not support ETHTOOL/MII and
1452                          * arp_interval is not set.  Note: if
1453                          * use_carrier is enabled, we will never go
1454                          * here (because netif_carrier is always
1455                          * supported); thus, we don't need to change
1456                          * the messages for netif_carrier.
1457                          */
1458                         printk(KERN_WARNING DRV_NAME
1459                                ": %s: Warning: MII and ETHTOOL support not "
1460                                "available for interface %s, and "
1461                                "arp_interval/arp_ip_target module parameters "
1462                                "not specified, thus bonding will not detect "
1463                                "link failures! see bonding.txt for details.\n",
1464                                bond_dev->name, slave_dev->name);
1465                 } else if (link_reporting == -1) {
1466                         /* unable get link status using mii/ethtool */
1467                         printk(KERN_WARNING DRV_NAME
1468                                ": %s: Warning: can't get link status from "
1469                                "interface %s; the network driver associated "
1470                                "with this interface does not support MII or "
1471                                "ETHTOOL link status reporting, thus miimon "
1472                                "has no effect on this interface.\n",
1473                                bond_dev->name, slave_dev->name);
1474                 }
1475         }
1476
1477         /* check for initial state */
1478         if (!bond->params.miimon ||
1479             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1480                 if (bond->params.updelay) {
1481                         dprintk("Initial state of slave_dev is "
1482                                 "BOND_LINK_BACK\n");
1483                         new_slave->link  = BOND_LINK_BACK;
1484                         new_slave->delay = bond->params.updelay;
1485                 } else {
1486                         dprintk("Initial state of slave_dev is "
1487                                 "BOND_LINK_UP\n");
1488                         new_slave->link  = BOND_LINK_UP;
1489                 }
1490                 new_slave->jiffies = jiffies;
1491         } else {
1492                 dprintk("Initial state of slave_dev is "
1493                         "BOND_LINK_DOWN\n");
1494                 new_slave->link  = BOND_LINK_DOWN;
1495         }
1496
1497         if (bond_update_speed_duplex(new_slave) &&
1498             (new_slave->link != BOND_LINK_DOWN)) {
1499                 printk(KERN_WARNING DRV_NAME
1500                        ": %s: Warning: failed to get speed and duplex from %s, "
1501                        "assumed to be 100Mb/sec and Full.\n",
1502                        bond_dev->name, new_slave->dev->name);
1503
1504                 if (bond->params.mode == BOND_MODE_8023AD) {
1505                         printk(KERN_WARNING DRV_NAME
1506                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1507                                "support in base driver for proper aggregator "
1508                                "selection.\n", bond_dev->name);
1509                 }
1510         }
1511
1512         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1513                 /* if there is a primary slave, remember it */
1514                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1515                         bond->primary_slave = new_slave;
1516                 }
1517         }
1518
1519         switch (bond->params.mode) {
1520         case BOND_MODE_ACTIVEBACKUP:
1521                 bond_set_slave_inactive_flags(new_slave);
1522                 bond_select_active_slave(bond);
1523                 break;
1524         case BOND_MODE_8023AD:
1525                 /* in 802.3ad mode, the internal mechanism
1526                  * will activate the slaves in the selected
1527                  * aggregator
1528                  */
1529                 bond_set_slave_inactive_flags(new_slave);
1530                 /* if this is the first slave */
1531                 if (bond->slave_cnt == 1) {
1532                         SLAVE_AD_INFO(new_slave).id = 1;
1533                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1534                          * can be called only after the mac address of the bond is set
1535                          */
1536                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1537                                             bond->params.lacp_fast);
1538                 } else {
1539                         SLAVE_AD_INFO(new_slave).id =
1540                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1541                 }
1542
1543                 bond_3ad_bind_slave(new_slave);
1544                 break;
1545         case BOND_MODE_TLB:
1546         case BOND_MODE_ALB:
1547                 new_slave->state = BOND_STATE_ACTIVE;
1548                 if ((!bond->curr_active_slave) &&
1549                     (new_slave->link != BOND_LINK_DOWN)) {
1550                         /* first slave or no active slave yet, and this link
1551                          * is OK, so make this interface the active one
1552                          */
1553                         bond_change_active_slave(bond, new_slave);
1554                 } else {
1555                         bond_set_slave_inactive_flags(new_slave);
1556                 }
1557                 break;
1558         default:
1559                 dprintk("This slave is always active in trunk mode\n");
1560
1561                 /* always active in trunk mode */
1562                 new_slave->state = BOND_STATE_ACTIVE;
1563
1564                 /* In trunking mode there is little meaning to curr_active_slave
1565                  * anyway (it holds no special properties of the bond device),
1566                  * so we can change it without calling change_active_interface()
1567                  */
1568                 if (!bond->curr_active_slave) {
1569                         bond->curr_active_slave = new_slave;
1570                 }
1571                 break;
1572         } /* switch(bond_mode) */
1573
1574         bond_set_carrier(bond);
1575
1576         write_unlock_bh(&bond->lock);
1577
1578         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1579         if (res)
1580                 goto err_unset_master;
1581
1582         printk(KERN_INFO DRV_NAME
1583                ": %s: enslaving %s as a%s interface with a%s link.\n",
1584                bond_dev->name, slave_dev->name,
1585                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1586                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1587
1588         /* enslave is successful */
1589         return 0;
1590
1591 /* Undo stages on error */
1592 err_unset_master:
1593         netdev_set_master(slave_dev, NULL);
1594
1595 err_close:
1596         dev_close(slave_dev);
1597
1598 err_restore_mac:
1599         memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1600         addr.sa_family = slave_dev->type;
1601         dev_set_mac_address(slave_dev, &addr);
1602
1603 err_free:
1604         kfree(new_slave);
1605
1606 err_undo_flags:
1607         bond_dev->features = old_features;
1608
1609         return res;
1610 }
1611
1612 /*
1613  * Try to release the slave device <slave> from the bond device <master>
1614  * It is legal to access curr_active_slave without a lock because all the function
1615  * is write-locked.
1616  *
1617  * The rules for slave state should be:
1618  *   for Active/Backup:
1619  *     Active stays on all backups go down
1620  *   for Bonded connections:
1621  *     The first up interface should be left on and all others downed.
1622  */
1623 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1624 {
1625         struct bonding *bond = bond_dev->priv;
1626         struct slave *slave, *oldcurrent;
1627         struct sockaddr addr;
1628         int mac_addr_differ;
1629
1630         /* slave is not a slave or master is not master of this slave */
1631         if (!(slave_dev->flags & IFF_SLAVE) ||
1632             (slave_dev->master != bond_dev)) {
1633                 printk(KERN_ERR DRV_NAME
1634                        ": %s: Error: cannot release %s.\n",
1635                        bond_dev->name, slave_dev->name);
1636                 return -EINVAL;
1637         }
1638
1639         write_lock_bh(&bond->lock);
1640
1641         slave = bond_get_slave_by_dev(bond, slave_dev);
1642         if (!slave) {
1643                 /* not a slave of this bond */
1644                 printk(KERN_INFO DRV_NAME
1645                        ": %s: %s not enslaved\n",
1646                        bond_dev->name, slave_dev->name);
1647                 write_unlock_bh(&bond->lock);
1648                 return -EINVAL;
1649         }
1650
1651         mac_addr_differ = memcmp(bond_dev->dev_addr,
1652                                  slave->perm_hwaddr,
1653                                  ETH_ALEN);
1654         if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1655                 printk(KERN_WARNING DRV_NAME
1656                        ": %s: Warning: the permanent HWaddr of %s "
1657                        "- %02X:%02X:%02X:%02X:%02X:%02X - is "
1658                        "still in use by %s. Set the HWaddr of "
1659                        "%s to a different address to avoid "
1660                        "conflicts.\n",
1661                        bond_dev->name,
1662                        slave_dev->name,
1663                        slave->perm_hwaddr[0],
1664                        slave->perm_hwaddr[1],
1665                        slave->perm_hwaddr[2],
1666                        slave->perm_hwaddr[3],
1667                        slave->perm_hwaddr[4],
1668                        slave->perm_hwaddr[5],
1669                        bond_dev->name,
1670                        slave_dev->name);
1671         }
1672
1673         /* Inform AD package of unbinding of slave. */
1674         if (bond->params.mode == BOND_MODE_8023AD) {
1675                 /* must be called before the slave is
1676                  * detached from the list
1677                  */
1678                 bond_3ad_unbind_slave(slave);
1679         }
1680
1681         printk(KERN_INFO DRV_NAME
1682                ": %s: releasing %s interface %s\n",
1683                bond_dev->name,
1684                (slave->state == BOND_STATE_ACTIVE)
1685                ? "active" : "backup",
1686                slave_dev->name);
1687
1688         oldcurrent = bond->curr_active_slave;
1689
1690         bond->current_arp_slave = NULL;
1691
1692         /* release the slave from its bond */
1693         bond_detach_slave(bond, slave);
1694
1695         bond_compute_features(bond);
1696
1697         if (bond->primary_slave == slave) {
1698                 bond->primary_slave = NULL;
1699         }
1700
1701         if (oldcurrent == slave) {
1702                 bond_change_active_slave(bond, NULL);
1703         }
1704
1705         if ((bond->params.mode == BOND_MODE_TLB) ||
1706             (bond->params.mode == BOND_MODE_ALB)) {
1707                 /* Must be called only after the slave has been
1708                  * detached from the list and the curr_active_slave
1709                  * has been cleared (if our_slave == old_current),
1710                  * but before a new active slave is selected.
1711                  */
1712                 bond_alb_deinit_slave(bond, slave);
1713         }
1714
1715         if (oldcurrent == slave)
1716                 bond_select_active_slave(bond);
1717
1718         if (bond->slave_cnt == 0) {
1719                 bond_set_carrier(bond);
1720
1721                 /* if the last slave was removed, zero the mac address
1722                  * of the master so it will be set by the application
1723                  * to the mac address of the first slave
1724                  */
1725                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1726
1727                 if (list_empty(&bond->vlan_list)) {
1728                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1729                 } else {
1730                         printk(KERN_WARNING DRV_NAME
1731                                ": %s: Warning: clearing HW address of %s while it "
1732                                "still has VLANs.\n",
1733                                bond_dev->name, bond_dev->name);
1734                         printk(KERN_WARNING DRV_NAME
1735                                ": %s: When re-adding slaves, make sure the bond's "
1736                                "HW address matches its VLANs'.\n",
1737                                bond_dev->name);
1738                 }
1739         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1740                    !bond_has_challenged_slaves(bond)) {
1741                 printk(KERN_INFO DRV_NAME
1742                        ": %s: last VLAN challenged slave %s "
1743                        "left bond %s. VLAN blocking is removed\n",
1744                        bond_dev->name, slave_dev->name, bond_dev->name);
1745                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1746         }
1747
1748         write_unlock_bh(&bond->lock);
1749
1750         /* must do this from outside any spinlocks */
1751         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1752
1753         bond_del_vlans_from_slave(bond, slave_dev);
1754
1755         /* If the mode USES_PRIMARY, then we should only remove its
1756          * promisc and mc settings if it was the curr_active_slave, but that was
1757          * already taken care of above when we detached the slave
1758          */
1759         if (!USES_PRIMARY(bond->params.mode)) {
1760                 /* unset promiscuity level from slave */
1761                 if (bond_dev->flags & IFF_PROMISC) {
1762                         dev_set_promiscuity(slave_dev, -1);
1763                 }
1764
1765                 /* unset allmulti level from slave */
1766                 if (bond_dev->flags & IFF_ALLMULTI) {
1767                         dev_set_allmulti(slave_dev, -1);
1768                 }
1769
1770                 /* flush master's mc_list from slave */
1771                 bond_mc_list_flush(bond_dev, slave_dev);
1772         }
1773
1774         netdev_set_master(slave_dev, NULL);
1775
1776         /* close slave before restoring its mac address */
1777         dev_close(slave_dev);
1778
1779         /* restore original ("permanent") mac address */
1780         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1781         addr.sa_family = slave_dev->type;
1782         dev_set_mac_address(slave_dev, &addr);
1783
1784         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1785                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1786                                    IFF_SLAVE_NEEDARP);
1787
1788         kfree(slave);
1789
1790         return 0;  /* deletion OK */
1791 }
1792
1793 /*
1794  * This function releases all slaves.
1795  */
1796 static int bond_release_all(struct net_device *bond_dev)
1797 {
1798         struct bonding *bond = bond_dev->priv;
1799         struct slave *slave;
1800         struct net_device *slave_dev;
1801         struct sockaddr addr;
1802
1803         write_lock_bh(&bond->lock);
1804
1805         netif_carrier_off(bond_dev);
1806
1807         if (bond->slave_cnt == 0) {
1808                 goto out;
1809         }
1810
1811         bond->current_arp_slave = NULL;
1812         bond->primary_slave = NULL;
1813         bond_change_active_slave(bond, NULL);
1814
1815         while ((slave = bond->first_slave) != NULL) {
1816                 /* Inform AD package of unbinding of slave
1817                  * before slave is detached from the list.
1818                  */
1819                 if (bond->params.mode == BOND_MODE_8023AD) {
1820                         bond_3ad_unbind_slave(slave);
1821                 }
1822
1823                 slave_dev = slave->dev;
1824                 bond_detach_slave(bond, slave);
1825
1826                 if ((bond->params.mode == BOND_MODE_TLB) ||
1827                     (bond->params.mode == BOND_MODE_ALB)) {
1828                         /* must be called only after the slave
1829                          * has been detached from the list
1830                          */
1831                         bond_alb_deinit_slave(bond, slave);
1832                 }
1833
1834                 bond_compute_features(bond);
1835
1836                 /* now that the slave is detached, unlock and perform
1837                  * all the undo steps that should not be called from
1838                  * within a lock.
1839                  */
1840                 write_unlock_bh(&bond->lock);
1841
1842                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1843                 bond_del_vlans_from_slave(bond, slave_dev);
1844
1845                 /* If the mode USES_PRIMARY, then we should only remove its
1846                  * promisc and mc settings if it was the curr_active_slave, but that was
1847                  * already taken care of above when we detached the slave
1848                  */
1849                 if (!USES_PRIMARY(bond->params.mode)) {
1850                         /* unset promiscuity level from slave */
1851                         if (bond_dev->flags & IFF_PROMISC) {
1852                                 dev_set_promiscuity(slave_dev, -1);
1853                         }
1854
1855                         /* unset allmulti level from slave */
1856                         if (bond_dev->flags & IFF_ALLMULTI) {
1857                                 dev_set_allmulti(slave_dev, -1);
1858                         }
1859
1860                         /* flush master's mc_list from slave */
1861                         bond_mc_list_flush(bond_dev, slave_dev);
1862                 }
1863
1864                 netdev_set_master(slave_dev, NULL);
1865
1866                 /* close slave before restoring its mac address */
1867                 dev_close(slave_dev);
1868
1869                 /* restore original ("permanent") mac address*/
1870                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1871                 addr.sa_family = slave_dev->type;
1872                 dev_set_mac_address(slave_dev, &addr);
1873
1874                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1875                                            IFF_SLAVE_INACTIVE);
1876
1877                 kfree(slave);
1878
1879                 /* re-acquire the lock before getting the next slave */
1880                 write_lock_bh(&bond->lock);
1881         }
1882
1883         /* zero the mac address of the master so it will be
1884          * set by the application to the mac address of the
1885          * first slave
1886          */
1887         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1888
1889         if (list_empty(&bond->vlan_list)) {
1890                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1891         } else {
1892                 printk(KERN_WARNING DRV_NAME
1893                        ": %s: Warning: clearing HW address of %s while it "
1894                        "still has VLANs.\n",
1895                        bond_dev->name, bond_dev->name);
1896                 printk(KERN_WARNING DRV_NAME
1897                        ": %s: When re-adding slaves, make sure the bond's "
1898                        "HW address matches its VLANs'.\n",
1899                        bond_dev->name);
1900         }
1901
1902         printk(KERN_INFO DRV_NAME
1903                ": %s: released all slaves\n",
1904                bond_dev->name);
1905
1906 out:
1907         write_unlock_bh(&bond->lock);
1908
1909         return 0;
1910 }
1911
1912 /*
1913  * This function changes the active slave to slave <slave_dev>.
1914  * It returns -EINVAL in the following cases.
1915  *  - <slave_dev> is not found in the list.
1916  *  - There is not active slave now.
1917  *  - <slave_dev> is already active.
1918  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1919  *  - <slave_dev> is not running.
1920  * In these cases, this fuction does nothing.
1921  * In the other cases, currnt_slave pointer is changed and 0 is returned.
1922  */
1923 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1924 {
1925         struct bonding *bond = bond_dev->priv;
1926         struct slave *old_active = NULL;
1927         struct slave *new_active = NULL;
1928         int res = 0;
1929
1930         if (!USES_PRIMARY(bond->params.mode)) {
1931                 return -EINVAL;
1932         }
1933
1934         /* Verify that master_dev is indeed the master of slave_dev */
1935         if (!(slave_dev->flags & IFF_SLAVE) ||
1936             (slave_dev->master != bond_dev)) {
1937                 return -EINVAL;
1938         }
1939
1940         write_lock_bh(&bond->lock);
1941
1942         old_active = bond->curr_active_slave;
1943         new_active = bond_get_slave_by_dev(bond, slave_dev);
1944
1945         /*
1946          * Changing to the current active: do nothing; return success.
1947          */
1948         if (new_active && (new_active == old_active)) {
1949                 write_unlock_bh(&bond->lock);
1950                 return 0;
1951         }
1952
1953         if ((new_active) &&
1954             (old_active) &&
1955             (new_active->link == BOND_LINK_UP) &&
1956             IS_UP(new_active->dev)) {
1957                 bond_change_active_slave(bond, new_active);
1958         } else {
1959                 res = -EINVAL;
1960         }
1961
1962         write_unlock_bh(&bond->lock);
1963
1964         return res;
1965 }
1966
1967 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1968 {
1969         struct bonding *bond = bond_dev->priv;
1970
1971         info->bond_mode = bond->params.mode;
1972         info->miimon = bond->params.miimon;
1973
1974         read_lock_bh(&bond->lock);
1975         info->num_slaves = bond->slave_cnt;
1976         read_unlock_bh(&bond->lock);
1977
1978         return 0;
1979 }
1980
1981 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1982 {
1983         struct bonding *bond = bond_dev->priv;
1984         struct slave *slave;
1985         int i, found = 0;
1986
1987         if (info->slave_id < 0) {
1988                 return -ENODEV;
1989         }
1990
1991         read_lock_bh(&bond->lock);
1992
1993         bond_for_each_slave(bond, slave, i) {
1994                 if (i == (int)info->slave_id) {
1995                         found = 1;
1996                         break;
1997                 }
1998         }
1999
2000         read_unlock_bh(&bond->lock);
2001
2002         if (found) {
2003                 strcpy(info->slave_name, slave->dev->name);
2004                 info->link = slave->link;
2005                 info->state = slave->state;
2006                 info->link_failure_count = slave->link_failure_count;
2007         } else {
2008                 return -ENODEV;
2009         }
2010
2011         return 0;
2012 }
2013
2014 /*-------------------------------- Monitoring -------------------------------*/
2015
2016 /* this function is called regularly to monitor each slave's link. */
2017 void bond_mii_monitor(struct net_device *bond_dev)
2018 {
2019         struct bonding *bond = bond_dev->priv;
2020         struct slave *slave, *oldcurrent;
2021         int do_failover = 0;
2022         int delta_in_ticks;
2023         int i;
2024
2025         read_lock(&bond->lock);
2026
2027         delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2028
2029         if (bond->kill_timers) {
2030                 goto out;
2031         }
2032
2033         if (bond->slave_cnt == 0) {
2034                 goto re_arm;
2035         }
2036
2037         /* we will try to read the link status of each of our slaves, and
2038          * set their IFF_RUNNING flag appropriately. For each slave not
2039          * supporting MII status, we won't do anything so that a user-space
2040          * program could monitor the link itself if needed.
2041          */
2042
2043         read_lock(&bond->curr_slave_lock);
2044         oldcurrent = bond->curr_active_slave;
2045         read_unlock(&bond->curr_slave_lock);
2046
2047         bond_for_each_slave(bond, slave, i) {
2048                 struct net_device *slave_dev = slave->dev;
2049                 int link_state;
2050                 u16 old_speed = slave->speed;
2051                 u8 old_duplex = slave->duplex;
2052
2053                 link_state = bond_check_dev_link(bond, slave_dev, 0);
2054
2055                 switch (slave->link) {
2056                 case BOND_LINK_UP:      /* the link was up */
2057                         if (link_state == BMSR_LSTATUS) {
2058                                 /* link stays up, nothing more to do */
2059                                 break;
2060                         } else { /* link going down */
2061                                 slave->link  = BOND_LINK_FAIL;
2062                                 slave->delay = bond->params.downdelay;
2063
2064                                 if (slave->link_failure_count < UINT_MAX) {
2065                                         slave->link_failure_count++;
2066                                 }
2067
2068                                 if (bond->params.downdelay) {
2069                                         printk(KERN_INFO DRV_NAME
2070                                                ": %s: link status down for %s "
2071                                                "interface %s, disabling it in "
2072                                                "%d ms.\n",
2073                                                bond_dev->name,
2074                                                IS_UP(slave_dev)
2075                                                ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2076                                                   ? ((slave == oldcurrent)
2077                                                      ? "active " : "backup ")
2078                                                   : "")
2079                                                : "idle ",
2080                                                slave_dev->name,
2081                                                bond->params.downdelay * bond->params.miimon);
2082                                 }
2083                         }
2084                         /* no break ! fall through the BOND_LINK_FAIL test to
2085                            ensure proper action to be taken
2086                         */
2087                 case BOND_LINK_FAIL:    /* the link has just gone down */
2088                         if (link_state != BMSR_LSTATUS) {
2089                                 /* link stays down */
2090                                 if (slave->delay <= 0) {
2091                                         /* link down for too long time */
2092                                         slave->link = BOND_LINK_DOWN;
2093
2094                                         /* in active/backup mode, we must
2095                                          * completely disable this interface
2096                                          */
2097                                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2098                                             (bond->params.mode == BOND_MODE_8023AD)) {
2099                                                 bond_set_slave_inactive_flags(slave);
2100                                         }
2101
2102                                         printk(KERN_INFO DRV_NAME
2103                                                ": %s: link status definitely "
2104                                                "down for interface %s, "
2105                                                "disabling it\n",
2106                                                bond_dev->name,
2107                                                slave_dev->name);
2108
2109                                         /* notify ad that the link status has changed */
2110                                         if (bond->params.mode == BOND_MODE_8023AD) {
2111                                                 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2112                                         }
2113
2114                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2115                                             (bond->params.mode == BOND_MODE_ALB)) {
2116                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2117                                         }
2118
2119                                         if (slave == oldcurrent) {
2120                                                 do_failover = 1;
2121                                         }
2122                                 } else {
2123                                         slave->delay--;
2124                                 }
2125                         } else {
2126                                 /* link up again */
2127                                 slave->link  = BOND_LINK_UP;
2128                                 slave->jiffies = jiffies;
2129                                 printk(KERN_INFO DRV_NAME
2130                                        ": %s: link status up again after %d "
2131                                        "ms for interface %s.\n",
2132                                        bond_dev->name,
2133                                        (bond->params.downdelay - slave->delay) * bond->params.miimon,
2134                                        slave_dev->name);
2135                         }
2136                         break;
2137                 case BOND_LINK_DOWN:    /* the link was down */
2138                         if (link_state != BMSR_LSTATUS) {
2139                                 /* the link stays down, nothing more to do */
2140                                 break;
2141                         } else {        /* link going up */
2142                                 slave->link  = BOND_LINK_BACK;
2143                                 slave->delay = bond->params.updelay;
2144
2145                                 if (bond->params.updelay) {
2146                                         /* if updelay == 0, no need to
2147                                            advertise about a 0 ms delay */
2148                                         printk(KERN_INFO DRV_NAME
2149                                                ": %s: link status up for "
2150                                                "interface %s, enabling it "
2151                                                "in %d ms.\n",
2152                                                bond_dev->name,
2153                                                slave_dev->name,
2154                                                bond->params.updelay * bond->params.miimon);
2155                                 }
2156                         }
2157                         /* no break ! fall through the BOND_LINK_BACK state in
2158                            case there's something to do.
2159                         */
2160                 case BOND_LINK_BACK:    /* the link has just come back */
2161                         if (link_state != BMSR_LSTATUS) {
2162                                 /* link down again */
2163                                 slave->link  = BOND_LINK_DOWN;
2164
2165                                 printk(KERN_INFO DRV_NAME
2166                                        ": %s: link status down again after %d "
2167                                        "ms for interface %s.\n",
2168                                        bond_dev->name,
2169                                        (bond->params.updelay - slave->delay) * bond->params.miimon,
2170                                        slave_dev->name);
2171                         } else {
2172                                 /* link stays up */
2173                                 if (slave->delay == 0) {
2174                                         /* now the link has been up for long time enough */
2175                                         slave->link = BOND_LINK_UP;
2176                                         slave->jiffies = jiffies;
2177
2178                                         if (bond->params.mode == BOND_MODE_8023AD) {
2179                                                 /* prevent it from being the active one */
2180                                                 slave->state = BOND_STATE_BACKUP;
2181                                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2182                                                 /* make it immediately active */
2183                                                 slave->state = BOND_STATE_ACTIVE;
2184                                         } else if (slave != bond->primary_slave) {
2185                                                 /* prevent it from being the active one */
2186                                                 slave->state = BOND_STATE_BACKUP;
2187                                         }
2188
2189                                         printk(KERN_INFO DRV_NAME
2190                                                ": %s: link status definitely "
2191                                                "up for interface %s.\n",
2192                                                bond_dev->name,
2193                                                slave_dev->name);
2194
2195                                         /* notify ad that the link status has changed */
2196                                         if (bond->params.mode == BOND_MODE_8023AD) {
2197                                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2198                                         }
2199
2200                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2201                                             (bond->params.mode == BOND_MODE_ALB)) {
2202                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2203                                         }
2204
2205                                         if ((!oldcurrent) ||
2206                                             (slave == bond->primary_slave)) {
2207                                                 do_failover = 1;
2208                                         }
2209                                 } else {
2210                                         slave->delay--;
2211                                 }
2212                         }
2213                         break;
2214                 default:
2215                         /* Should not happen */
2216                         printk(KERN_ERR DRV_NAME
2217                                ": %s: Error: %s Illegal value (link=%d)\n",
2218                                bond_dev->name,
2219                                slave->dev->name,
2220                                slave->link);
2221                         goto out;
2222                 } /* end of switch (slave->link) */
2223
2224                 bond_update_speed_duplex(slave);
2225
2226                 if (bond->params.mode == BOND_MODE_8023AD) {
2227                         if (old_speed != slave->speed) {
2228                                 bond_3ad_adapter_speed_changed(slave);
2229                         }
2230
2231                         if (old_duplex != slave->duplex) {
2232                                 bond_3ad_adapter_duplex_changed(slave);
2233                         }
2234                 }
2235
2236         } /* end of for */
2237
2238         if (do_failover) {
2239                 write_lock(&bond->curr_slave_lock);
2240
2241                 bond_select_active_slave(bond);
2242
2243                 write_unlock(&bond->curr_slave_lock);
2244         } else
2245                 bond_set_carrier(bond);
2246
2247 re_arm:
2248         if (bond->params.miimon) {
2249                 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2250         }
2251 out:
2252         read_unlock(&bond->lock);
2253 }
2254
2255
2256 static u32 bond_glean_dev_ip(struct net_device *dev)
2257 {
2258         struct in_device *idev;
2259         struct in_ifaddr *ifa;
2260         __be32 addr = 0;
2261
2262         if (!dev)
2263                 return 0;
2264
2265         rcu_read_lock();
2266         idev = __in_dev_get_rcu(dev);
2267         if (!idev)
2268                 goto out;
2269
2270         ifa = idev->ifa_list;
2271         if (!ifa)
2272                 goto out;
2273
2274         addr = ifa->ifa_local;
2275 out:
2276         rcu_read_unlock();
2277         return addr;
2278 }
2279
2280 static int bond_has_ip(struct bonding *bond)
2281 {
2282         struct vlan_entry *vlan, *vlan_next;
2283
2284         if (bond->master_ip)
2285                 return 1;
2286
2287         if (list_empty(&bond->vlan_list))
2288                 return 0;
2289
2290         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2291                                  vlan_list) {
2292                 if (vlan->vlan_ip)
2293                         return 1;
2294         }
2295
2296         return 0;
2297 }
2298
2299 static int bond_has_this_ip(struct bonding *bond, u32 ip)
2300 {
2301         struct vlan_entry *vlan, *vlan_next;
2302
2303         if (ip == bond->master_ip)
2304                 return 1;
2305
2306         if (list_empty(&bond->vlan_list))
2307                 return 0;
2308
2309         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2310                                  vlan_list) {
2311                 if (ip == vlan->vlan_ip)
2312                         return 1;
2313         }
2314
2315         return 0;
2316 }
2317
2318 /*
2319  * We go to the (large) trouble of VLAN tagging ARP frames because
2320  * switches in VLAN mode (especially if ports are configured as
2321  * "native" to a VLAN) might not pass non-tagged frames.
2322  */
2323 static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
2324 {
2325         struct sk_buff *skb;
2326
2327         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2328                slave_dev->name, dest_ip, src_ip, vlan_id);
2329
2330         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2331                          NULL, slave_dev->dev_addr, NULL);
2332
2333         if (!skb) {
2334                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2335                 return;
2336         }
2337         if (vlan_id) {
2338                 skb = vlan_put_tag(skb, vlan_id);
2339                 if (!skb) {
2340                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2341                         return;
2342                 }
2343         }
2344         arp_xmit(skb);
2345 }
2346
2347
2348 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2349 {
2350         int i, vlan_id, rv;
2351         u32 *targets = bond->params.arp_targets;
2352         struct vlan_entry *vlan, *vlan_next;
2353         struct net_device *vlan_dev;
2354         struct flowi fl;
2355         struct rtable *rt;
2356
2357         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2358                 if (!targets[i])
2359                         continue;
2360                 dprintk("basa: target %x\n", targets[i]);
2361                 if (list_empty(&bond->vlan_list)) {
2362                         dprintk("basa: empty vlan: arp_send\n");
2363                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2364                                       bond->master_ip, 0);
2365                         continue;
2366                 }
2367
2368                 /*
2369                  * If VLANs are configured, we do a route lookup to
2370                  * determine which VLAN interface would be used, so we
2371                  * can tag the ARP with the proper VLAN tag.
2372                  */
2373                 memset(&fl, 0, sizeof(fl));
2374                 fl.fl4_dst = targets[i];
2375                 fl.fl4_tos = RTO_ONLINK;
2376
2377                 rv = ip_route_output_key(&rt, &fl);
2378                 if (rv) {
2379                         if (net_ratelimit()) {
2380                                 printk(KERN_WARNING DRV_NAME
2381                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2382                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2383                         }
2384                         continue;
2385                 }
2386
2387                 /*
2388                  * This target is not on a VLAN
2389                  */
2390                 if (rt->u.dst.dev == bond->dev) {
2391                         ip_rt_put(rt);
2392                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2393                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2394                                       bond->master_ip, 0);
2395                         continue;
2396                 }
2397
2398                 vlan_id = 0;
2399                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2400                                          vlan_list) {
2401                         vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2402                         if (vlan_dev == rt->u.dst.dev) {
2403                                 vlan_id = vlan->vlan_id;
2404                                 dprintk("basa: vlan match on %s %d\n",
2405                                        vlan_dev->name, vlan_id);
2406                                 break;
2407                         }
2408                 }
2409
2410                 if (vlan_id) {
2411                         ip_rt_put(rt);
2412                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2413                                       vlan->vlan_ip, vlan_id);
2414                         continue;
2415                 }
2416
2417                 if (net_ratelimit()) {
2418                         printk(KERN_WARNING DRV_NAME
2419                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2420                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2421                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2422                 }
2423                 ip_rt_put(rt);
2424         }
2425 }
2426
2427 /*
2428  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2429  * for each VLAN above us.
2430  */
2431 static void bond_send_gratuitous_arp(struct bonding *bond)
2432 {
2433         struct slave *slave = bond->curr_active_slave;
2434         struct vlan_entry *vlan;
2435         struct net_device *vlan_dev;
2436
2437         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2438                                 slave ? slave->dev->name : "NULL");
2439         if (!slave)
2440                 return;
2441
2442         if (bond->master_ip) {
2443                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2444                                   bond->master_ip, 0);
2445         }
2446
2447         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2448                 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2449                 if (vlan->vlan_ip) {
2450                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2451                                       vlan->vlan_ip, vlan->vlan_id);
2452                 }
2453         }
2454 }
2455
2456 static void bond_validate_arp(struct bonding *bond, struct slave *slave, u32 sip, u32 tip)
2457 {
2458         int i;
2459         u32 *targets = bond->params.arp_targets;
2460
2461         targets = bond->params.arp_targets;
2462         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2463                 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2464                         "%u.%u.%u.%u bhti(tip) %d\n",
2465                        NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2466                        bond_has_this_ip(bond, tip));
2467                 if (sip == targets[i]) {
2468                         if (bond_has_this_ip(bond, tip))
2469                                 slave->last_arp_rx = jiffies;
2470                         return;
2471                 }
2472         }
2473 }
2474
2475 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2476 {
2477         struct arphdr *arp;
2478         struct slave *slave;
2479         struct bonding *bond;
2480         unsigned char *arp_ptr;
2481         u32 sip, tip;
2482
2483         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2484                 goto out;
2485
2486         bond = dev->priv;
2487         read_lock(&bond->lock);
2488
2489         dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2490                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2491                 orig_dev ? orig_dev->name : "NULL");
2492
2493         slave = bond_get_slave_by_dev(bond, orig_dev);
2494         if (!slave || !slave_do_arp_validate(bond, slave))
2495                 goto out_unlock;
2496
2497         /* ARP header, plus 2 device addresses, plus 2 IP addresses.  */
2498         if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
2499                                  (2 * dev->addr_len) +
2500                                  (2 * sizeof(u32)))))
2501                 goto out_unlock;
2502
2503         arp = skb->nh.arph;
2504         if (arp->ar_hln != dev->addr_len ||
2505             skb->pkt_type == PACKET_OTHERHOST ||
2506             skb->pkt_type == PACKET_LOOPBACK ||
2507             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2508             arp->ar_pro != htons(ETH_P_IP) ||
2509             arp->ar_pln != 4)
2510                 goto out_unlock;
2511
2512         arp_ptr = (unsigned char *)(arp + 1);
2513         arp_ptr += dev->addr_len;
2514         memcpy(&sip, arp_ptr, 4);
2515         arp_ptr += 4 + dev->addr_len;
2516         memcpy(&tip, arp_ptr, 4);
2517
2518         dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2519                 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2520                 slave->state, bond->params.arp_validate,
2521                 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2522
2523         /*
2524          * Backup slaves won't see the ARP reply, but do come through
2525          * here for each ARP probe (so we swap the sip/tip to validate
2526          * the probe).  In a "redundant switch, common router" type of
2527          * configuration, the ARP probe will (hopefully) travel from
2528          * the active, through one switch, the router, then the other
2529          * switch before reaching the backup.
2530          */
2531         if (slave->state == BOND_STATE_ACTIVE)
2532                 bond_validate_arp(bond, slave, sip, tip);
2533         else
2534                 bond_validate_arp(bond, slave, tip, sip);
2535
2536 out_unlock:
2537         read_unlock(&bond->lock);
2538 out:
2539         dev_kfree_skb(skb);
2540         return NET_RX_SUCCESS;
2541 }
2542
2543 /*
2544  * this function is called regularly to monitor each slave's link
2545  * ensuring that traffic is being sent and received when arp monitoring
2546  * is used in load-balancing mode. if the adapter has been dormant, then an
2547  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2548  * arp monitoring in active backup mode.
2549  */
2550 void bond_loadbalance_arp_mon(struct net_device *bond_dev)
2551 {
2552         struct bonding *bond = bond_dev->priv;
2553         struct slave *slave, *oldcurrent;
2554         int do_failover = 0;
2555         int delta_in_ticks;
2556         int i;
2557
2558         read_lock(&bond->lock);
2559
2560         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2561
2562         if (bond->kill_timers) {
2563                 goto out;
2564         }
2565
2566         if (bond->slave_cnt == 0) {
2567                 goto re_arm;
2568         }
2569
2570         read_lock(&bond->curr_slave_lock);
2571         oldcurrent = bond->curr_active_slave;
2572         read_unlock(&bond->curr_slave_lock);
2573
2574         /* see if any of the previous devices are up now (i.e. they have
2575          * xmt and rcv traffic). the curr_active_slave does not come into
2576          * the picture unless it is null. also, slave->jiffies is not needed
2577          * here because we send an arp on each slave and give a slave as
2578          * long as it needs to get the tx/rx within the delta.
2579          * TODO: what about up/down delay in arp mode? it wasn't here before
2580          *       so it can wait
2581          */
2582         bond_for_each_slave(bond, slave, i) {
2583                 if (slave->link != BOND_LINK_UP) {
2584                         if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2585                             ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2586
2587                                 slave->link  = BOND_LINK_UP;
2588                                 slave->state = BOND_STATE_ACTIVE;
2589
2590                                 /* primary_slave has no meaning in round-robin
2591                                  * mode. the window of a slave being up and
2592                                  * curr_active_slave being null after enslaving
2593                                  * is closed.
2594                                  */
2595                                 if (!oldcurrent) {
2596                                         printk(KERN_INFO DRV_NAME
2597                                                ": %s: link status definitely "
2598                                                "up for interface %s, ",
2599                                                bond_dev->name,
2600                                                slave->dev->name);
2601                                         do_failover = 1;
2602                                 } else {
2603                                         printk(KERN_INFO DRV_NAME
2604                                                ": %s: interface %s is now up\n",
2605                                                bond_dev->name,
2606                                                slave->dev->name);
2607                                 }
2608                         }
2609                 } else {
2610                         /* slave->link == BOND_LINK_UP */
2611
2612                         /* not all switches will respond to an arp request
2613                          * when the source ip is 0, so don't take the link down
2614                          * if we don't know our ip yet
2615                          */
2616                         if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2617                             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2618                              bond_has_ip(bond))) {
2619
2620                                 slave->link  = BOND_LINK_DOWN;
2621                                 slave->state = BOND_STATE_BACKUP;
2622
2623                                 if (slave->link_failure_count < UINT_MAX) {
2624                                         slave->link_failure_count++;
2625                                 }
2626
2627                                 printk(KERN_INFO DRV_NAME
2628                                        ": %s: interface %s is now down.\n",
2629                                        bond_dev->name,
2630                                        slave->dev->name);
2631
2632                                 if (slave == oldcurrent) {
2633                                         do_failover = 1;
2634                                 }
2635                         }
2636                 }
2637
2638                 /* note: if switch is in round-robin mode, all links
2639                  * must tx arp to ensure all links rx an arp - otherwise
2640                  * links may oscillate or not come up at all; if switch is
2641                  * in something like xor mode, there is nothing we can
2642                  * do - all replies will be rx'ed on same link causing slaves
2643                  * to be unstable during low/no traffic periods
2644                  */
2645                 if (IS_UP(slave->dev)) {
2646                         bond_arp_send_all(bond, slave);
2647                 }
2648         }
2649
2650         if (do_failover) {
2651                 write_lock(&bond->curr_slave_lock);
2652
2653                 bond_select_active_slave(bond);
2654
2655                 write_unlock(&bond->curr_slave_lock);
2656         }
2657
2658 re_arm:
2659         if (bond->params.arp_interval) {
2660                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2661         }
2662 out:
2663         read_unlock(&bond->lock);
2664 }
2665
2666 /*
2667  * When using arp monitoring in active-backup mode, this function is
2668  * called to determine if any backup slaves have went down or a new
2669  * current slave needs to be found.
2670  * The backup slaves never generate traffic, they are considered up by merely
2671  * receiving traffic. If the current slave goes down, each backup slave will
2672  * be given the opportunity to tx/rx an arp before being taken down - this
2673  * prevents all slaves from being taken down due to the current slave not
2674  * sending any traffic for the backups to receive. The arps are not necessarily
2675  * necessary, any tx and rx traffic will keep the current slave up. While any
2676  * rx traffic will keep the backup slaves up, the current slave is responsible
2677  * for generating traffic to keep them up regardless of any other traffic they
2678  * may have received.
2679  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2680  */
2681 void bond_activebackup_arp_mon(struct net_device *bond_dev)
2682 {
2683         struct bonding *bond = bond_dev->priv;
2684         struct slave *slave;
2685         int delta_in_ticks;
2686         int i;
2687
2688         read_lock(&bond->lock);
2689
2690         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2691
2692         if (bond->kill_timers) {
2693                 goto out;
2694         }
2695
2696         if (bond->slave_cnt == 0) {
2697                 goto re_arm;
2698         }
2699
2700         /* determine if any slave has come up or any backup slave has
2701          * gone down
2702          * TODO: what about up/down delay in arp mode? it wasn't here before
2703          *       so it can wait
2704          */
2705         bond_for_each_slave(bond, slave, i) {
2706                 if (slave->link != BOND_LINK_UP) {
2707                         if ((jiffies - slave_last_rx(bond, slave)) <=
2708                              delta_in_ticks) {
2709
2710                                 slave->link = BOND_LINK_UP;
2711
2712                                 write_lock(&bond->curr_slave_lock);
2713
2714                                 if ((!bond->curr_active_slave) &&
2715                                     ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2716                                         bond_change_active_slave(bond, slave);
2717                                         bond->current_arp_slave = NULL;
2718                                 } else if (bond->curr_active_slave != slave) {
2719                                         /* this slave has just come up but we
2720                                          * already have a current slave; this
2721                                          * can also happen if bond_enslave adds
2722                                          * a new slave that is up while we are
2723                                          * searching for a new slave
2724                                          */
2725                                         bond_set_slave_inactive_flags(slave);
2726                                         bond->current_arp_slave = NULL;
2727                                 }
2728
2729                                 bond_set_carrier(bond);
2730
2731                                 if (slave == bond->curr_active_slave) {
2732                                         printk(KERN_INFO DRV_NAME
2733                                                ": %s: %s is up and now the "
2734                                                "active interface\n",
2735                                                bond_dev->name,
2736                                                slave->dev->name);
2737                                         netif_carrier_on(bond->dev);
2738                                 } else {
2739                                         printk(KERN_INFO DRV_NAME
2740                                                ": %s: backup interface %s is "
2741                                                "now up\n",
2742                                                bond_dev->name,
2743                                                slave->dev->name);
2744                                 }
2745
2746                                 write_unlock(&bond->curr_slave_lock);
2747                         }
2748                 } else {
2749                         read_lock(&bond->curr_slave_lock);
2750
2751                         if ((slave != bond->curr_active_slave) &&
2752                             (!bond->current_arp_slave) &&
2753                             (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
2754                              bond_has_ip(bond))) {
2755                                 /* a backup slave has gone down; three times
2756                                  * the delta allows the current slave to be
2757                                  * taken out before the backup slave.
2758                                  * note: a non-null current_arp_slave indicates
2759                                  * the curr_active_slave went down and we are
2760                                  * searching for a new one; under this
2761                                  * condition we only take the curr_active_slave
2762                                  * down - this gives each slave a chance to
2763                                  * tx/rx traffic before being taken out
2764                                  */
2765
2766                                 read_unlock(&bond->curr_slave_lock);
2767
2768                                 slave->link  = BOND_LINK_DOWN;
2769
2770                                 if (slave->link_failure_count < UINT_MAX) {
2771                                         slave->link_failure_count++;
2772                                 }
2773
2774                                 bond_set_slave_inactive_flags(slave);
2775
2776                                 printk(KERN_INFO DRV_NAME
2777                                        ": %s: backup interface %s is now down\n",
2778                                        bond_dev->name,
2779                                        slave->dev->name);
2780                         } else {
2781                                 read_unlock(&bond->curr_slave_lock);
2782                         }
2783                 }
2784         }
2785
2786         read_lock(&bond->curr_slave_lock);
2787         slave = bond->curr_active_slave;
2788         read_unlock(&bond->curr_slave_lock);
2789
2790         if (slave) {
2791                 /* if we have sent traffic in the past 2*arp_intervals but
2792                  * haven't xmit and rx traffic in that time interval, select
2793                  * a different slave. slave->jiffies is only updated when
2794                  * a slave first becomes the curr_active_slave - not necessarily
2795                  * after every arp; this ensures the slave has a full 2*delta
2796                  * before being taken out. if a primary is being used, check
2797                  * if it is up and needs to take over as the curr_active_slave
2798                  */
2799                 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2800             (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
2801              bond_has_ip(bond))) &&
2802                     ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2803
2804                         slave->link  = BOND_LINK_DOWN;
2805
2806                         if (slave->link_failure_count < UINT_MAX) {
2807                                 slave->link_failure_count++;
2808                         }
2809
2810                         printk(KERN_INFO DRV_NAME
2811                                ": %s: link status down for active interface "
2812                                "%s, disabling it\n",
2813                                bond_dev->name,
2814                                slave->dev->name);
2815
2816                         write_lock(&bond->curr_slave_lock);
2817
2818                         bond_select_active_slave(bond);
2819                         slave = bond->curr_active_slave;
2820
2821                         write_unlock(&bond->curr_slave_lock);
2822
2823                         bond->current_arp_slave = slave;
2824
2825                         if (slave) {
2826                                 slave->jiffies = jiffies;
2827                         }
2828                 } else if ((bond->primary_slave) &&
2829                            (bond->primary_slave != slave) &&
2830                            (bond->primary_slave->link == BOND_LINK_UP)) {
2831                         /* at this point, slave is the curr_active_slave */
2832                         printk(KERN_INFO DRV_NAME
2833                                ": %s: changing from interface %s to primary "
2834                                "interface %s\n",
2835                                bond_dev->name,
2836                                slave->dev->name,
2837                                bond->primary_slave->dev->name);
2838
2839                         /* primary is up so switch to it */
2840                         write_lock(&bond->curr_slave_lock);
2841                         bond_change_active_slave(bond, bond->primary_slave);
2842                         write_unlock(&bond->curr_slave_lock);
2843
2844                         slave = bond->primary_slave;
2845                         slave->jiffies = jiffies;
2846                 } else {
2847                         bond->current_arp_slave = NULL;
2848                 }
2849
2850                 /* the current slave must tx an arp to ensure backup slaves
2851                  * rx traffic
2852                  */
2853                 if (slave && bond_has_ip(bond)) {
2854                         bond_arp_send_all(bond, slave);
2855                 }
2856         }
2857
2858         /* if we don't have a curr_active_slave, search for the next available
2859          * backup slave from the current_arp_slave and make it the candidate
2860          * for becoming the curr_active_slave
2861          */
2862         if (!slave) {
2863                 if (!bond->current_arp_slave) {
2864                         bond->current_arp_slave = bond->first_slave;
2865                 }
2866
2867                 if (bond->current_arp_slave) {
2868                         bond_set_slave_inactive_flags(bond->current_arp_slave);
2869
2870                         /* search for next candidate */
2871                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2872                                 if (IS_UP(slave->dev)) {
2873                                         slave->link = BOND_LINK_BACK;
2874                                         bond_set_slave_active_flags(slave);
2875                                         bond_arp_send_all(bond, slave);
2876                                         slave->jiffies = jiffies;
2877                                         bond->current_arp_slave = slave;
2878                                         break;
2879                                 }
2880
2881                                 /* if the link state is up at this point, we
2882                                  * mark it down - this can happen if we have
2883                                  * simultaneous link failures and
2884                                  * reselect_active_interface doesn't make this
2885                                  * one the current slave so it is still marked
2886                                  * up when it is actually down
2887                                  */
2888                                 if (slave->link == BOND_LINK_UP) {
2889                                         slave->link  = BOND_LINK_DOWN;
2890                                         if (slave->link_failure_count < UINT_MAX) {
2891                                                 slave->link_failure_count++;
2892                                         }
2893
2894                                         bond_set_slave_inactive_flags(slave);
2895
2896                                         printk(KERN_INFO DRV_NAME
2897                                                ": %s: backup interface %s is "
2898                                                "now down.\n",
2899                                                bond_dev->name,
2900                                                slave->dev->name);
2901                                 }
2902                         }
2903                 }
2904         }
2905
2906 re_arm:
2907         if (bond->params.arp_interval) {
2908                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2909         }
2910 out:
2911         read_unlock(&bond->lock);
2912 }
2913
2914 /*------------------------------ proc/seq_file-------------------------------*/
2915
2916 #ifdef CONFIG_PROC_FS
2917
2918 #define SEQ_START_TOKEN ((void *)1)
2919
2920 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2921 {
2922         struct bonding *bond = seq->private;
2923         loff_t off = 0;
2924         struct slave *slave;
2925         int i;
2926
2927         /* make sure the bond won't be taken away */
2928         read_lock(&dev_base_lock);
2929         read_lock_bh(&bond->lock);
2930
2931         if (*pos == 0) {
2932                 return SEQ_START_TOKEN;
2933         }
2934
2935         bond_for_each_slave(bond, slave, i) {
2936                 if (++off == *pos) {
2937                         return slave;
2938                 }
2939         }
2940
2941         return NULL;
2942 }
2943
2944 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2945 {
2946         struct bonding *bond = seq->private;
2947         struct slave *slave = v;
2948
2949         ++*pos;
2950         if (v == SEQ_START_TOKEN) {
2951                 return bond->first_slave;
2952         }
2953
2954         slave = slave->next;
2955
2956         return (slave == bond->first_slave) ? NULL : slave;
2957 }
2958
2959 static void bond_info_seq_stop(struct seq_file *seq, void *v)
2960 {
2961         struct bonding *bond = seq->private;
2962
2963         read_unlock_bh(&bond->lock);
2964         read_unlock(&dev_base_lock);
2965 }
2966
2967 static void bond_info_show_master(struct seq_file *seq)
2968 {
2969         struct bonding *bond = seq->private;
2970         struct slave *curr;
2971         int i;
2972         u32 target;
2973
2974         read_lock(&bond->curr_slave_lock);
2975         curr = bond->curr_active_slave;
2976         read_unlock(&bond->curr_slave_lock);
2977
2978         seq_printf(seq, "Bonding Mode: %s\n",
2979                    bond_mode_name(bond->params.mode));
2980
2981         if (bond->params.mode == BOND_MODE_XOR ||
2982                 bond->params.mode == BOND_MODE_8023AD) {
2983                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2984                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2985                         bond->params.xmit_policy);
2986         }
2987
2988         if (USES_PRIMARY(bond->params.mode)) {
2989                 seq_printf(seq, "Primary Slave: %s\n",
2990                            (bond->primary_slave) ?
2991                            bond->primary_slave->dev->name : "None");
2992
2993                 seq_printf(seq, "Currently Active Slave: %s\n",
2994                            (curr) ? curr->dev->name : "None");
2995         }
2996
2997         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
2998                    "up" : "down");
2999         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3000         seq_printf(seq, "Up Delay (ms): %d\n",
3001                    bond->params.updelay * bond->params.miimon);
3002         seq_printf(seq, "Down Delay (ms): %d\n",
3003                    bond->params.downdelay * bond->params.miimon);
3004
3005
3006         /* ARP information */
3007         if(bond->params.arp_interval > 0) {
3008                 int printed=0;
3009                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3010                                 bond->params.arp_interval);
3011
3012                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3013
3014                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3015                         if (!bond->params.arp_targets[i])
3016                                 continue;
3017                         if (printed)
3018                                 seq_printf(seq, ",");
3019                         target = ntohl(bond->params.arp_targets[i]);
3020                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
3021                         printed = 1;
3022                 }
3023                 seq_printf(seq, "\n");
3024         }
3025
3026         if (bond->params.mode == BOND_MODE_8023AD) {
3027                 struct ad_info ad_info;
3028
3029                 seq_puts(seq, "\n802.3ad info\n");
3030                 seq_printf(seq, "LACP rate: %s\n",
3031                            (bond->params.lacp_fast) ? "fast" : "slow");
3032
3033                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3034                         seq_printf(seq, "bond %s has no active aggregator\n",
3035                                    bond->dev->name);
3036                 } else {
3037                         seq_printf(seq, "Active Aggregator Info:\n");
3038
3039                         seq_printf(seq, "\tAggregator ID: %d\n",
3040                                    ad_info.aggregator_id);
3041                         seq_printf(seq, "\tNumber of ports: %d\n",
3042                                    ad_info.ports);
3043                         seq_printf(seq, "\tActor Key: %d\n",
3044                                    ad_info.actor_key);
3045                         seq_printf(seq, "\tPartner Key: %d\n",
3046                                    ad_info.partner_key);
3047                         seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
3048                                    ad_info.partner_system[0],
3049                                    ad_info.partner_system[1],
3050                                    ad_info.partner_system[2],
3051                                    ad_info.partner_system[3],
3052                                    ad_info.partner_system[4],
3053                                    ad_info.partner_system[5]);
3054                 }
3055         }
3056 }
3057
3058 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3059 {
3060         struct bonding *bond = seq->private;
3061
3062         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3063         seq_printf(seq, "MII Status: %s\n",
3064                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3065         seq_printf(seq, "Link Failure Count: %u\n",
3066                    slave->link_failure_count);
3067
3068         seq_printf(seq,
3069                    "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
3070                    slave->perm_hwaddr[0], slave->perm_hwaddr[1],
3071                    slave->perm_hwaddr[2], slave->perm_hwaddr[3],
3072                    slave->perm_hwaddr[4], slave->perm_hwaddr[5]);
3073
3074         if (bond->params.mode == BOND_MODE_8023AD) {
3075                 const struct aggregator *agg
3076                         = SLAVE_AD_INFO(slave).port.aggregator;
3077
3078                 if (agg) {
3079                         seq_printf(seq, "Aggregator ID: %d\n",
3080                                    agg->aggregator_identifier);
3081                 } else {
3082                         seq_puts(seq, "Aggregator ID: N/A\n");
3083                 }
3084         }
3085 }
3086
3087 static int bond_info_seq_show(struct seq_file *seq, void *v)
3088 {
3089         if (v == SEQ_START_TOKEN) {
3090                 seq_printf(seq, "%s\n", version);
3091                 bond_info_show_master(seq);
3092         } else {
3093                 bond_info_show_slave(seq, v);
3094         }
3095
3096         return 0;
3097 }
3098
3099 static struct seq_operations bond_info_seq_ops = {
3100         .start = bond_info_seq_start,
3101         .next  = bond_info_seq_next,
3102         .stop  = bond_info_seq_stop,
3103         .show  = bond_info_seq_show,
3104 };
3105
3106 static int bond_info_open(struct inode *inode, struct file *file)
3107 {
3108         struct seq_file *seq;
3109         struct proc_dir_entry *proc;
3110         int res;
3111
3112         res = seq_open(file, &bond_info_seq_ops);
3113         if (!res) {
3114                 /* recover the pointer buried in proc_dir_entry data */
3115                 seq = file->private_data;
3116                 proc = PDE(inode);
3117                 seq->private = proc->data;
3118         }
3119
3120         return res;
3121 }
3122
3123 static const struct file_operations bond_info_fops = {
3124         .owner   = THIS_MODULE,
3125         .open    = bond_info_open,
3126         .read    = seq_read,
3127         .llseek  = seq_lseek,
3128         .release = seq_release,
3129 };
3130
3131 static int bond_create_proc_entry(struct bonding *bond)
3132 {
3133         struct net_device *bond_dev = bond->dev;
3134
3135         if (bond_proc_dir) {
3136                 bond->proc_entry = create_proc_entry(bond_dev->name,
3137                                                      S_IRUGO,
3138                                                      bond_proc_dir);
3139                 if (bond->proc_entry == NULL) {
3140                         printk(KERN_WARNING DRV_NAME
3141                                ": Warning: Cannot create /proc/net/%s/%s\n",
3142                                DRV_NAME, bond_dev->name);
3143                 } else {
3144                         bond->proc_entry->data = bond;
3145                         bond->proc_entry->proc_fops = &bond_info_fops;
3146                         bond->proc_entry->owner = THIS_MODULE;
3147                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3148                 }
3149         }
3150
3151         return 0;
3152 }
3153
3154 static void bond_remove_proc_entry(struct bonding *bond)
3155 {
3156         if (bond_proc_dir && bond->proc_entry) {
3157                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3158                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3159                 bond->proc_entry = NULL;
3160         }
3161 }
3162
3163 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3164  * Caller must hold rtnl_lock.
3165  */
3166 static void bond_create_proc_dir(void)
3167 {
3168         int len = strlen(DRV_NAME);
3169
3170         for (bond_proc_dir = proc_net->subdir; bond_proc_dir;
3171              bond_proc_dir = bond_proc_dir->next) {
3172                 if ((bond_proc_dir->namelen == len) &&
3173                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3174                         break;
3175                 }
3176         }
3177
3178         if (!bond_proc_dir) {
3179                 bond_proc_dir = proc_mkdir(DRV_NAME, proc_net);
3180                 if (bond_proc_dir) {
3181                         bond_proc_dir->owner = THIS_MODULE;
3182                 } else {
3183                         printk(KERN_WARNING DRV_NAME
3184                                 ": Warning: cannot create /proc/net/%s\n",
3185                                 DRV_NAME);
3186                 }
3187         }
3188 }
3189
3190 /* Destroy the bonding directory under /proc/net, if empty.
3191  * Caller must hold rtnl_lock.
3192  */
3193 static void bond_destroy_proc_dir(void)
3194 {
3195         struct proc_dir_entry *de;
3196
3197         if (!bond_proc_dir) {
3198                 return;
3199         }
3200
3201         /* verify that the /proc dir is empty */
3202         for (de = bond_proc_dir->subdir; de; de = de->next) {
3203                 /* ignore . and .. */
3204                 if (*(de->name) != '.') {
3205                         break;
3206                 }
3207         }
3208
3209         if (de) {
3210                 if (bond_proc_dir->owner == THIS_MODULE) {
3211                         bond_proc_dir->owner = NULL;
3212                 }
3213         } else {
3214                 remove_proc_entry(DRV_NAME, proc_net);
3215                 bond_proc_dir = NULL;
3216         }
3217 }
3218 #endif /* CONFIG_PROC_FS */
3219
3220 /*-------------------------- netdev event handling --------------------------*/
3221
3222 /*
3223  * Change device name
3224  */
3225 static int bond_event_changename(struct bonding *bond)
3226 {
3227 #ifdef CONFIG_PROC_FS
3228         bond_remove_proc_entry(bond);
3229         bond_create_proc_entry(bond);
3230 #endif
3231         down_write(&(bonding_rwsem));
3232         bond_destroy_sysfs_entry(bond);
3233         bond_create_sysfs_entry(bond);
3234         up_write(&(bonding_rwsem));
3235         return NOTIFY_DONE;
3236 }
3237
3238 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3239 {
3240         struct bonding *event_bond = bond_dev->priv;
3241
3242         switch (event) {
3243         case NETDEV_CHANGENAME:
3244                 return bond_event_changename(event_bond);
3245         case NETDEV_UNREGISTER:
3246                 /*
3247                  * TODO: remove a bond from the list?
3248                  */
3249                 break;
3250         default:
3251                 break;
3252         }
3253
3254         return NOTIFY_DONE;
3255 }
3256
3257 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3258 {
3259         struct net_device *bond_dev = slave_dev->master;
3260         struct bonding *bond = bond_dev->priv;
3261
3262         switch (event) {
3263         case NETDEV_UNREGISTER:
3264                 if (bond_dev) {
3265                         bond_release(bond_dev, slave_dev);
3266                 }
3267                 break;
3268         case NETDEV_CHANGE:
3269                 /*
3270                  * TODO: is this what we get if somebody
3271                  * sets up a hierarchical bond, then rmmod's
3272                  * one of the slave bonding devices?
3273                  */
3274                 break;
3275         case NETDEV_DOWN:
3276                 /*
3277                  * ... Or is it this?
3278                  */
3279                 break;
3280         case NETDEV_CHANGEMTU:
3281                 /*
3282                  * TODO: Should slaves be allowed to
3283                  * independently alter their MTU?  For
3284                  * an active-backup bond, slaves need
3285                  * not be the same type of device, so
3286                  * MTUs may vary.  For other modes,
3287                  * slaves arguably should have the
3288                  * same MTUs. To do this, we'd need to
3289                  * take over the slave's change_mtu
3290                  * function for the duration of their
3291                  * servitude.
3292                  */
3293                 break;
3294         case NETDEV_CHANGENAME:
3295                 /*
3296                  * TODO: handle changing the primary's name
3297                  */
3298                 break;
3299         case NETDEV_FEAT_CHANGE:
3300                 bond_compute_features(bond);
3301                 break;
3302         default:
3303                 break;
3304         }
3305
3306         return NOTIFY_DONE;
3307 }
3308
3309 /*
3310  * bond_netdev_event: handle netdev notifier chain events.
3311  *
3312  * This function receives events for the netdev chain.  The caller (an
3313  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3314  * locks for us to safely manipulate the slave devices (RTNL lock,
3315  * dev_probe_lock).
3316  */
3317 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3318 {
3319         struct net_device *event_dev = (struct net_device *)ptr;
3320
3321         dprintk("event_dev: %s, event: %lx\n",
3322                 (event_dev ? event_dev->name : "None"),
3323                 event);
3324
3325         if (!(event_dev->priv_flags & IFF_BONDING))
3326                 return NOTIFY_DONE;
3327
3328         if (event_dev->flags & IFF_MASTER) {
3329                 dprintk("IFF_MASTER\n");
3330                 return bond_master_netdev_event(event, event_dev);
3331         }
3332
3333         if (event_dev->flags & IFF_SLAVE) {
3334                 dprintk("IFF_SLAVE\n");
3335                 return bond_slave_netdev_event(event, event_dev);
3336         }
3337
3338         return NOTIFY_DONE;
3339 }
3340
3341 /*
3342  * bond_inetaddr_event: handle inetaddr notifier chain events.
3343  *
3344  * We keep track of device IPs primarily to use as source addresses in
3345  * ARP monitor probes (rather than spewing out broadcasts all the time).
3346  *
3347  * We track one IP for the main device (if it has one), plus one per VLAN.
3348  */
3349 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3350 {
3351         struct in_ifaddr *ifa = ptr;
3352         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3353         struct bonding *bond, *bond_next;
3354         struct vlan_entry *vlan, *vlan_next;
3355
3356         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3357                 if (bond->dev == event_dev) {
3358                         switch (event) {
3359                         case NETDEV_UP:
3360                                 bond->master_ip = ifa->ifa_local;
3361                                 return NOTIFY_OK;
3362                         case NETDEV_DOWN:
3363                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3364                                 return NOTIFY_OK;
3365                         default:
3366                                 return NOTIFY_DONE;
3367                         }
3368                 }
3369
3370                 if (list_empty(&bond->vlan_list))
3371                         continue;
3372
3373                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3374                                          vlan_list) {
3375                         vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
3376                         if (vlan_dev == event_dev) {
3377                                 switch (event) {
3378                                 case NETDEV_UP:
3379                                         vlan->vlan_ip = ifa->ifa_local;
3380                                         return NOTIFY_OK;
3381                                 case NETDEV_DOWN:
3382                                         vlan->vlan_ip =
3383                                                 bond_glean_dev_ip(vlan_dev);
3384                                         return NOTIFY_OK;
3385                                 default:
3386                                         return NOTIFY_DONE;
3387                                 }
3388                         }
3389                 }
3390         }
3391         return NOTIFY_DONE;
3392 }
3393
3394 static struct notifier_block bond_netdev_notifier = {
3395         .notifier_call = bond_netdev_event,
3396 };
3397
3398 static struct notifier_block bond_inetaddr_notifier = {
3399         .notifier_call = bond_inetaddr_event,
3400 };
3401
3402 /*-------------------------- Packet type handling ---------------------------*/
3403
3404 /* register to receive lacpdus on a bond */
3405 static void bond_register_lacpdu(struct bonding *bond)
3406 {
3407         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3408
3409         /* initialize packet type */
3410         pk_type->type = PKT_TYPE_LACPDU;
3411         pk_type->dev = bond->dev;
3412         pk_type->func = bond_3ad_lacpdu_recv;
3413
3414         dev_add_pack(pk_type);
3415 }
3416
3417 /* unregister to receive lacpdus on a bond */
3418 static void bond_unregister_lacpdu(struct bonding *bond)
3419 {
3420         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3421 }
3422
3423 void bond_register_arp(struct bonding *bond)
3424 {
3425         struct packet_type *pt = &bond->arp_mon_pt;
3426
3427         pt->type = htons(ETH_P_ARP);
3428         pt->dev = NULL; /*bond->dev;XXX*/
3429         pt->func = bond_arp_rcv;
3430         dev_add_pack(pt);
3431 }
3432
3433 void bond_unregister_arp(struct bonding *bond)
3434 {
3435         dev_remove_pack(&bond->arp_mon_pt);
3436 }
3437
3438 /*---------------------------- Hashing Policies -----------------------------*/
3439
3440 /*
3441  * Hash for the the output device based upon layer 3 and layer 4 data. If
3442  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3443  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3444  */
3445 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3446                                     struct net_device *bond_dev, int count)
3447 {
3448         struct ethhdr *data = (struct ethhdr *)skb->data;
3449         struct iphdr *iph = skb->nh.iph;
3450         u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
3451         int layer4_xor = 0;
3452
3453         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3454                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3455                     (iph->protocol == IPPROTO_TCP ||
3456                      iph->protocol == IPPROTO_UDP)) {
3457                         layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
3458                 }
3459                 return (layer4_xor ^
3460                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3461
3462         }
3463
3464         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3465 }
3466
3467 /*
3468  * Hash for the output device based upon layer 2 data
3469  */
3470 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3471                                    struct net_device *bond_dev, int count)
3472 {
3473         struct ethhdr *data = (struct ethhdr *)skb->data;
3474
3475         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3476 }
3477
3478 /*-------------------------- Device entry points ----------------------------*/
3479
3480 static int bond_open(struct net_device *bond_dev)
3481 {
3482         struct bonding *bond = bond_dev->priv;
3483         struct timer_list *mii_timer = &bond->mii_timer;
3484         struct timer_list *arp_timer = &bond->arp_timer;
3485
3486         bond->kill_timers = 0;
3487
3488         if ((bond->params.mode == BOND_MODE_TLB) ||
3489             (bond->params.mode == BOND_MODE_ALB)) {
3490                 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3491
3492                 /* bond_alb_initialize must be called before the timer
3493                  * is started.
3494                  */
3495                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3496                         /* something went wrong - fail the open operation */
3497                         return -1;
3498                 }
3499
3500                 init_timer(alb_timer);
3501                 alb_timer->expires  = jiffies + 1;
3502                 alb_timer->data     = (unsigned long)bond;
3503                 alb_timer->function = (void *)&bond_alb_monitor;
3504                 add_timer(alb_timer);
3505         }
3506
3507         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3508                 init_timer(mii_timer);
3509                 mii_timer->expires  = jiffies + 1;
3510                 mii_timer->data     = (unsigned long)bond_dev;
3511                 mii_timer->function = (void *)&bond_mii_monitor;
3512                 add_timer(mii_timer);
3513         }
3514
3515         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3516                 init_timer(arp_timer);
3517                 arp_timer->expires  = jiffies + 1;
3518                 arp_timer->data     = (unsigned long)bond_dev;
3519                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3520                         arp_timer->function = (void *)&bond_activebackup_arp_mon;
3521                 } else {
3522                         arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3523                 }
3524                 if (bond->params.arp_validate)
3525                         bond_register_arp(bond);
3526
3527                 add_timer(arp_timer);
3528         }
3529
3530         if (bond->params.mode == BOND_MODE_8023AD) {
3531                 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3532                 init_timer(ad_timer);
3533                 ad_timer->expires  = jiffies + 1;
3534                 ad_timer->data     = (unsigned long)bond;
3535                 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3536                 add_timer(ad_timer);
3537
3538                 /* register to receive LACPDUs */
3539                 bond_register_lacpdu(bond);
3540         }
3541
3542         return 0;
3543 }
3544
3545 static int bond_close(struct net_device *bond_dev)
3546 {
3547         struct bonding *bond = bond_dev->priv;
3548
3549         if (bond->params.mode == BOND_MODE_8023AD) {
3550                 /* Unregister the receive of LACPDUs */
3551                 bond_unregister_lacpdu(bond);
3552         }
3553
3554         if (bond->params.arp_validate)
3555                 bond_unregister_arp(bond);
3556
3557         write_lock_bh(&bond->lock);
3558
3559
3560         /* signal timers not to re-arm */
3561         bond->kill_timers = 1;
3562
3563         write_unlock_bh(&bond->lock);
3564
3565         /* del_timer_sync must run without holding the bond->lock
3566          * because a running timer might be trying to hold it too
3567          */
3568
3569         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3570                 del_timer_sync(&bond->mii_timer);
3571         }
3572
3573         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3574                 del_timer_sync(&bond->arp_timer);
3575         }
3576
3577         switch (bond->params.mode) {
3578         case BOND_MODE_8023AD:
3579                 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3580                 break;
3581         case BOND_MODE_TLB:
3582         case BOND_MODE_ALB:
3583                 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3584                 break;
3585         default:
3586                 break;
3587         }
3588
3589
3590         if ((bond->params.mode == BOND_MODE_TLB) ||
3591             (bond->params.mode == BOND_MODE_ALB)) {
3592                 /* Must be called only after all
3593                  * slaves have been released
3594                  */
3595                 bond_alb_deinitialize(bond);
3596         }
3597
3598         return 0;
3599 }
3600
3601 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3602 {
3603         struct bonding *bond = bond_dev->priv;
3604         struct net_device_stats *stats = &(bond->stats), *sstats;
3605         struct slave *slave;
3606         int i;
3607
3608         memset(stats, 0, sizeof(struct net_device_stats));
3609
3610         read_lock_bh(&bond->lock);
3611
3612         bond_for_each_slave(bond, slave, i) {
3613                 if (slave->dev->get_stats) {
3614                         sstats = slave->dev->get_stats(slave->dev);
3615
3616                         stats->rx_packets += sstats->rx_packets;
3617                         stats->rx_bytes += sstats->rx_bytes;
3618                         stats->rx_errors += sstats->rx_errors;
3619                         stats->rx_dropped += sstats->rx_dropped;
3620
3621                         stats->tx_packets += sstats->tx_packets;
3622                         stats->tx_bytes += sstats->tx_bytes;
3623                         stats->tx_errors += sstats->tx_errors;
3624                         stats->tx_dropped += sstats->tx_dropped;
3625
3626                         stats->multicast += sstats->multicast;
3627                         stats->collisions += sstats->collisions;
3628
3629                         stats->rx_length_errors += sstats->rx_length_errors;
3630                         stats->rx_over_errors += sstats->rx_over_errors;
3631                         stats->rx_crc_errors += sstats->rx_crc_errors;
3632                         stats->rx_frame_errors += sstats->rx_frame_errors;
3633                         stats->rx_fifo_errors += sstats->rx_fifo_errors;
3634                         stats->rx_missed_errors += sstats->rx_missed_errors;
3635
3636                         stats->tx_aborted_errors += sstats->tx_aborted_errors;
3637                         stats->tx_carrier_errors += sstats->tx_carrier_errors;
3638                         stats->tx_fifo_errors += sstats->tx_fifo_errors;
3639                         stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3640                         stats->tx_window_errors += sstats->tx_window_errors;
3641                 }
3642         }
3643
3644         read_unlock_bh(&bond->lock);
3645
3646         return stats;
3647 }
3648
3649 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3650 {
3651         struct net_device *slave_dev = NULL;
3652         struct ifbond k_binfo;
3653         struct ifbond __user *u_binfo = NULL;
3654         struct ifslave k_sinfo;
3655         struct ifslave __user *u_sinfo = NULL;
3656         struct mii_ioctl_data *mii = NULL;
3657         int res = 0;
3658
3659         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3660                 bond_dev->name, cmd);
3661
3662         switch (cmd) {
3663         case SIOCGMIIPHY:
3664                 mii = if_mii(ifr);
3665                 if (!mii) {
3666                         return -EINVAL;
3667                 }
3668                 mii->phy_id = 0;
3669                 /* Fall Through */
3670         case SIOCGMIIREG:
3671                 /*
3672                  * We do this again just in case we were called by SIOCGMIIREG
3673                  * instead of SIOCGMIIPHY.
3674                  */
3675                 mii = if_mii(ifr);
3676                 if (!mii) {
3677                         return -EINVAL;
3678                 }
3679
3680                 if (mii->reg_num == 1) {
3681                         struct bonding *bond = bond_dev->priv;
3682                         mii->val_out = 0;
3683                         read_lock_bh(&bond->lock);
3684                         read_lock(&bond->curr_slave_lock);
3685                         if (netif_carrier_ok(bond->dev)) {
3686                                 mii->val_out = BMSR_LSTATUS;
3687                         }
3688                         read_unlock(&bond->curr_slave_lock);
3689                         read_unlock_bh(&bond->lock);
3690                 }
3691
3692                 return 0;
3693         case BOND_INFO_QUERY_OLD:
3694         case SIOCBONDINFOQUERY:
3695                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3696
3697                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3698                         return -EFAULT;
3699                 }
3700
3701                 res = bond_info_query(bond_dev, &k_binfo);
3702                 if (res == 0) {
3703                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3704                                 return -EFAULT;
3705                         }
3706                 }
3707
3708                 return res;
3709         case BOND_SLAVE_INFO_QUERY_OLD:
3710         case SIOCBONDSLAVEINFOQUERY:
3711                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3712
3713                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3714                         return -EFAULT;
3715                 }
3716
3717                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3718                 if (res == 0) {
3719                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3720                                 return -EFAULT;
3721                         }
3722                 }
3723
3724                 return res;
3725         default:
3726                 /* Go on */
3727                 break;
3728         }
3729
3730         if (!capable(CAP_NET_ADMIN)) {
3731                 return -EPERM;
3732         }
3733
3734         down_write(&(bonding_rwsem));
3735         slave_dev = dev_get_by_name(ifr->ifr_slave);
3736
3737         dprintk("slave_dev=%p: \n", slave_dev);
3738
3739         if (!slave_dev) {
3740                 res = -ENODEV;
3741         } else {
3742                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3743                 switch (cmd) {
3744                 case BOND_ENSLAVE_OLD:
3745                 case SIOCBONDENSLAVE:
3746                         res = bond_enslave(bond_dev, slave_dev);
3747                         break;
3748                 case BOND_RELEASE_OLD:
3749                 case SIOCBONDRELEASE:
3750                         res = bond_release(bond_dev, slave_dev);
3751                         break;
3752                 case BOND_SETHWADDR_OLD:
3753                 case SIOCBONDSETHWADDR:
3754                         res = bond_sethwaddr(bond_dev, slave_dev);
3755                         break;
3756                 case BOND_CHANGE_ACTIVE_OLD:
3757                 case SIOCBONDCHANGEACTIVE:
3758                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3759                         break;
3760                 default:
3761                         res = -EOPNOTSUPP;
3762                 }
3763
3764                 dev_put(slave_dev);
3765         }
3766
3767         up_write(&(bonding_rwsem));
3768         return res;
3769 }
3770
3771 static void bond_set_multicast_list(struct net_device *bond_dev)
3772 {
3773         struct bonding *bond = bond_dev->priv;
3774         struct dev_mc_list *dmi;
3775
3776         write_lock_bh(&bond->lock);
3777
3778         /*
3779          * Do promisc before checking multicast_mode
3780          */
3781         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3782                 bond_set_promiscuity(bond, 1);
3783         }
3784
3785         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3786                 bond_set_promiscuity(bond, -1);
3787         }
3788
3789         /* set allmulti flag to slaves */
3790         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3791                 bond_set_allmulti(bond, 1);
3792         }
3793
3794         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3795                 bond_set_allmulti(bond, -1);
3796         }
3797
3798         bond->flags = bond_dev->flags;
3799
3800         /* looking for addresses to add to slaves' mc list */
3801         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3802                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3803                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3804                 }
3805         }
3806
3807         /* looking for addresses to delete from slaves' list */
3808         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3809                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3810                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3811                 }
3812         }
3813
3814         /* save master's multicast list */
3815         bond_mc_list_destroy(bond);
3816         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3817
3818         write_unlock_bh(&bond->lock);
3819 }
3820
3821 /*
3822  * Change the MTU of all of a master's slaves to match the master
3823  */
3824 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3825 {
3826         struct bonding *bond = bond_dev->priv;
3827         struct slave *slave, *stop_at;
3828         int res = 0;
3829         int i;
3830
3831         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3832                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3833
3834         /* Can't hold bond->lock with bh disabled here since
3835          * some base drivers panic. On the other hand we can't
3836          * hold bond->lock without bh disabled because we'll
3837          * deadlock. The only solution is to rely on the fact
3838          * that we're under rtnl_lock here, and the slaves
3839          * list won't change. This doesn't solve the problem
3840          * of setting the slave's MTU while it is
3841          * transmitting, but the assumption is that the base
3842          * driver can handle that.
3843          *
3844          * TODO: figure out a way to safely iterate the slaves
3845          * list, but without holding a lock around the actual
3846          * call to the base driver.
3847          */
3848
3849         bond_for_each_slave(bond, slave, i) {
3850                 dprintk("s %p s->p %p c_m %p\n", slave,
3851                         slave->prev, slave->dev->change_mtu);
3852
3853                 res = dev_set_mtu(slave->dev, new_mtu);
3854
3855                 if (res) {
3856                         /* If we failed to set the slave's mtu to the new value
3857                          * we must abort the operation even in ACTIVE_BACKUP
3858                          * mode, because if we allow the backup slaves to have
3859                          * different mtu values than the active slave we'll
3860                          * need to change their mtu when doing a failover. That
3861                          * means changing their mtu from timer context, which
3862                          * is probably not a good idea.
3863                          */
3864                         dprintk("err %d %s\n", res, slave->dev->name);
3865                         goto unwind;
3866                 }
3867         }
3868
3869         bond_dev->mtu = new_mtu;
3870
3871         return 0;
3872
3873 unwind:
3874         /* unwind from head to the slave that failed */
3875         stop_at = slave;
3876         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3877                 int tmp_res;
3878
3879                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3880                 if (tmp_res) {
3881                         dprintk("unwind err %d dev %s\n", tmp_res,
3882                                 slave->dev->name);
3883                 }
3884         }
3885
3886         return res;
3887 }
3888
3889 /*
3890  * Change HW address
3891  *
3892  * Note that many devices must be down to change the HW address, and
3893  * downing the master releases all slaves.  We can make bonds full of
3894  * bonding devices to test this, however.
3895  */
3896 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3897 {
3898         struct bonding *bond = bond_dev->priv;
3899         struct sockaddr *sa = addr, tmp_sa;
3900         struct slave *slave, *stop_at;
3901         int res = 0;
3902         int i;
3903
3904         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3905
3906         if (!is_valid_ether_addr(sa->sa_data)) {
3907                 return -EADDRNOTAVAIL;
3908         }
3909
3910         /* Can't hold bond->lock with bh disabled here since
3911          * some base drivers panic. On the other hand we can't
3912          * hold bond->lock without bh disabled because we'll
3913          * deadlock. The only solution is to rely on the fact
3914          * that we're under rtnl_lock here, and the slaves
3915          * list won't change. This doesn't solve the problem
3916          * of setting the slave's hw address while it is
3917          * transmitting, but the assumption is that the base
3918          * driver can handle that.
3919          *
3920          * TODO: figure out a way to safely iterate the slaves
3921          * list, but without holding a lock around the actual
3922          * call to the base driver.
3923          */
3924
3925         bond_for_each_slave(bond, slave, i) {
3926                 dprintk("slave %p %s\n", slave, slave->dev->name);
3927
3928                 if (slave->dev->set_mac_address == NULL) {
3929                         res = -EOPNOTSUPP;
3930                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3931                         goto unwind;
3932                 }
3933
3934                 res = dev_set_mac_address(slave->dev, addr);
3935                 if (res) {
3936                         /* TODO: consider downing the slave
3937                          * and retry ?
3938                          * User should expect communications
3939                          * breakage anyway until ARP finish
3940                          * updating, so...
3941                          */
3942                         dprintk("err %d %s\n", res, slave->dev->name);
3943                         goto unwind;
3944                 }
3945         }
3946
3947         /* success */
3948         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3949         return 0;
3950
3951 unwind:
3952         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3953         tmp_sa.sa_family = bond_dev->type;
3954
3955         /* unwind from head to the slave that failed */
3956         stop_at = slave;
3957         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3958                 int tmp_res;
3959
3960                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3961                 if (tmp_res) {
3962                         dprintk("unwind err %d dev %s\n", tmp_res,
3963                                 slave->dev->name);
3964                 }
3965         }
3966
3967         return res;
3968 }
3969
3970 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3971 {
3972         struct bonding *bond = bond_dev->priv;
3973         struct slave *slave, *start_at;
3974         int i;
3975         int res = 1;
3976
3977         read_lock(&bond->lock);
3978
3979         if (!BOND_IS_OK(bond)) {
3980                 goto out;
3981         }
3982
3983         read_lock(&bond->curr_slave_lock);
3984         slave = start_at = bond->curr_active_slave;
3985         read_unlock(&bond->curr_slave_lock);
3986
3987         if (!slave) {
3988                 goto out;
3989         }
3990
3991         bond_for_each_slave_from(bond, slave, i, start_at) {
3992                 if (IS_UP(slave->dev) &&
3993                     (slave->link == BOND_LINK_UP) &&
3994                     (slave->state == BOND_STATE_ACTIVE)) {
3995                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3996
3997                         write_lock(&bond->curr_slave_lock);
3998                         bond->curr_active_slave = slave->next;
3999                         write_unlock(&bond->curr_slave_lock);
4000
4001                         break;
4002                 }
4003         }
4004
4005
4006 out:
4007         if (res) {
4008                 /* no suitable interface, frame not sent */
4009                 dev_kfree_skb(skb);
4010         }
4011         read_unlock(&bond->lock);
4012         return 0;
4013 }
4014
4015 static void bond_activebackup_xmit_copy(struct sk_buff *skb,
4016                                         struct bonding *bond,
4017                                         struct slave *slave)
4018 {
4019         struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
4020         struct ethhdr *eth_data;
4021         u8 *hwaddr;
4022         int res;
4023
4024         if (!skb2) {
4025                 printk(KERN_ERR DRV_NAME ": Error: "
4026                        "bond_activebackup_xmit_copy(): skb_copy() failed\n");
4027                 return;
4028         }
4029
4030         skb2->mac.raw = (unsigned char *)skb2->data;
4031         eth_data = eth_hdr(skb2);
4032
4033         /* Pick an appropriate source MAC address
4034          *      -- use slave's perm MAC addr, unless used by bond
4035          *      -- otherwise, borrow active slave's perm MAC addr
4036          *         since that will not be used
4037          */
4038         hwaddr = slave->perm_hwaddr;
4039         if (!memcmp(eth_data->h_source, hwaddr, ETH_ALEN))
4040                 hwaddr = bond->curr_active_slave->perm_hwaddr;
4041
4042         /* Set source MAC address appropriately */
4043         memcpy(eth_data->h_source, hwaddr, ETH_ALEN);
4044
4045         res = bond_dev_queue_xmit(bond, skb2, slave->dev);
4046         if (res)
4047                 dev_kfree_skb(skb2);
4048
4049         return;
4050 }
4051
4052 /*
4053  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4054  * the bond has a usable interface.
4055  */
4056 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4057 {
4058         struct bonding *bond = bond_dev->priv;
4059         int res = 1;
4060
4061         read_lock(&bond->lock);
4062         read_lock(&bond->curr_slave_lock);
4063
4064         if (!BOND_IS_OK(bond)) {
4065                 goto out;
4066         }
4067
4068         if (!bond->curr_active_slave)
4069                 goto out;
4070
4071         /* Xmit IGMP frames on all slaves to ensure rapid fail-over
4072            for multicast traffic on snooping switches */
4073         if (skb->protocol == __constant_htons(ETH_P_IP) &&
4074             skb->nh.iph->protocol == IPPROTO_IGMP) {
4075                 struct slave *slave, *active_slave;
4076                 int i;
4077
4078                 active_slave = bond->curr_active_slave;
4079                 bond_for_each_slave_from_to(bond, slave, i, active_slave->next,
4080                                             active_slave->prev)
4081                         if (IS_UP(slave->dev) &&
4082                             (slave->link == BOND_LINK_UP))
4083                                 bond_activebackup_xmit_copy(skb, bond, slave);
4084         }
4085
4086         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4087
4088 out:
4089         if (res) {
4090                 /* no suitable interface, frame not sent */
4091                 dev_kfree_skb(skb);
4092         }
4093         read_unlock(&bond->curr_slave_lock);
4094         read_unlock(&bond->lock);
4095         return 0;
4096 }
4097
4098 /*
4099  * In bond_xmit_xor() , we determine the output device by using a pre-
4100  * determined xmit_hash_policy(), If the selected device is not enabled,
4101  * find the next active slave.
4102  */
4103 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4104 {
4105         struct bonding *bond = bond_dev->priv;
4106         struct slave *slave, *start_at;
4107         int slave_no;
4108         int i;
4109         int res = 1;
4110
4111         read_lock(&bond->lock);
4112
4113         if (!BOND_IS_OK(bond)) {
4114                 goto out;
4115         }
4116
4117         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4118
4119         bond_for_each_slave(bond, slave, i) {
4120                 slave_no--;
4121                 if (slave_no < 0) {
4122                         break;
4123                 }
4124         }
4125
4126         start_at = slave;
4127
4128         bond_for_each_slave_from(bond, slave, i, start_at) {
4129                 if (IS_UP(slave->dev) &&
4130                     (slave->link == BOND_LINK_UP) &&
4131                     (slave->state == BOND_STATE_ACTIVE)) {
4132                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4133                         break;
4134                 }
4135         }
4136
4137 out:
4138         if (res) {
4139                 /* no suitable interface, frame not sent */
4140                 dev_kfree_skb(skb);
4141         }
4142         read_unlock(&bond->lock);
4143         return 0;
4144 }
4145
4146 /*
4147  * in broadcast mode, we send everything to all usable interfaces.
4148  */
4149 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4150 {
4151         struct bonding *bond = bond_dev->priv;
4152         struct slave *slave, *start_at;
4153         struct net_device *tx_dev = NULL;
4154         int i;
4155         int res = 1;
4156
4157         read_lock(&bond->lock);
4158
4159         if (!BOND_IS_OK(bond)) {
4160                 goto out;
4161         }
4162
4163         read_lock(&bond->curr_slave_lock);
4164         start_at = bond->curr_active_slave;
4165         read_unlock(&bond->curr_slave_lock);
4166
4167         if (!start_at) {
4168                 goto out;
4169         }
4170
4171         bond_for_each_slave_from(bond, slave, i, start_at) {
4172                 if (IS_UP(slave->dev) &&
4173                     (slave->link == BOND_LINK_UP) &&
4174                     (slave->state == BOND_STATE_ACTIVE)) {
4175                         if (tx_dev) {
4176                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4177                                 if (!skb2) {
4178                                         printk(KERN_ERR DRV_NAME
4179                                                ": %s: Error: bond_xmit_broadcast(): "
4180                                                "skb_clone() failed\n",
4181                                                bond_dev->name);
4182                                         continue;
4183                                 }
4184
4185                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4186                                 if (res) {
4187                                         dev_kfree_skb(skb2);
4188                                         continue;
4189                                 }
4190                         }
4191                         tx_dev = slave->dev;
4192                 }
4193         }
4194
4195         if (tx_dev) {
4196                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4197         }
4198
4199 out:
4200         if (res) {
4201                 /* no suitable interface, frame not sent */
4202                 dev_kfree_skb(skb);
4203         }
4204         /* frame sent to all suitable interfaces */
4205         read_unlock(&bond->lock);
4206         return 0;
4207 }
4208
4209 /*------------------------- Device initialization ---------------------------*/
4210
4211 /*
4212  * set bond mode specific net device operations
4213  */
4214 void bond_set_mode_ops(struct bonding *bond, int mode)
4215 {
4216         struct net_device *bond_dev = bond->dev;
4217
4218         switch (mode) {
4219         case BOND_MODE_ROUNDROBIN:
4220                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4221                 break;
4222         case BOND_MODE_ACTIVEBACKUP:
4223                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4224                 break;
4225         case BOND_MODE_XOR:
4226                 bond_dev->hard_start_xmit = bond_xmit_xor;
4227                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4228                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4229                 else
4230                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4231                 break;
4232         case BOND_MODE_BROADCAST:
4233                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4234                 break;
4235         case BOND_MODE_8023AD:
4236                 bond_set_master_3ad_flags(bond);
4237                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4238                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4239                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4240                 else
4241                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4242                 break;
4243         case BOND_MODE_ALB:
4244                 bond_set_master_alb_flags(bond);
4245                 /* FALLTHRU */
4246         case BOND_MODE_TLB:
4247                 bond_dev->hard_start_xmit = bond_alb_xmit;
4248                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4249                 break;
4250         default:
4251                 /* Should never happen, mode already checked */
4252                 printk(KERN_ERR DRV_NAME
4253                        ": %s: Error: Unknown bonding mode %d\n",
4254                        bond_dev->name,
4255                        mode);
4256                 break;
4257         }
4258 }
4259
4260 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4261                                     struct ethtool_drvinfo *drvinfo)
4262 {
4263         strncpy(drvinfo->driver, DRV_NAME, 32);
4264         strncpy(drvinfo->version, DRV_VERSION, 32);
4265         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4266 }
4267
4268 static const struct ethtool_ops bond_ethtool_ops = {
4269         .get_tx_csum            = ethtool_op_get_tx_csum,
4270         .get_tso                = ethtool_op_get_tso,
4271         .get_ufo                = ethtool_op_get_ufo,
4272         .get_sg                 = ethtool_op_get_sg,
4273         .get_drvinfo            = bond_ethtool_get_drvinfo,
4274 };
4275
4276 /*
4277  * Does not allocate but creates a /proc entry.
4278  * Allowed to fail.
4279  */
4280 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4281 {
4282         struct bonding *bond = bond_dev->priv;
4283
4284         dprintk("Begin bond_init for %s\n", bond_dev->name);
4285
4286         /* initialize rwlocks */
4287         rwlock_init(&bond->lock);
4288         rwlock_init(&bond->curr_slave_lock);
4289
4290         bond->params = *params; /* copy params struct */
4291
4292         /* Initialize pointers */
4293         bond->first_slave = NULL;
4294         bond->curr_active_slave = NULL;
4295         bond->current_arp_slave = NULL;
4296         bond->primary_slave = NULL;
4297         bond->dev = bond_dev;
4298         INIT_LIST_HEAD(&bond->vlan_list);
4299
4300         /* Initialize the device entry points */
4301         bond_dev->open = bond_open;
4302         bond_dev->stop = bond_close;
4303         bond_dev->get_stats = bond_get_stats;
4304         bond_dev->do_ioctl = bond_do_ioctl;
4305         bond_dev->ethtool_ops = &bond_ethtool_ops;
4306         bond_dev->set_multicast_list = bond_set_multicast_list;
4307         bond_dev->change_mtu = bond_change_mtu;
4308         bond_dev->set_mac_address = bond_set_mac_address;
4309
4310         bond_set_mode_ops(bond, bond->params.mode);
4311
4312         bond_dev->destructor = free_netdev;
4313
4314         /* Initialize the device options */
4315         bond_dev->tx_queue_len = 0;
4316         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4317         bond_dev->priv_flags |= IFF_BONDING;
4318
4319         /* At first, we block adding VLANs. That's the only way to
4320          * prevent problems that occur when adding VLANs over an
4321          * empty bond. The block will be removed once non-challenged
4322          * slaves are enslaved.
4323          */
4324         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4325
4326         /* don't acquire bond device's netif_tx_lock when
4327          * transmitting */
4328         bond_dev->features |= NETIF_F_LLTX;
4329
4330         /* By default, we declare the bond to be fully
4331          * VLAN hardware accelerated capable. Special
4332          * care is taken in the various xmit functions
4333          * when there are slaves that are not hw accel
4334          * capable
4335          */
4336         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4337         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4338         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4339         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4340                                NETIF_F_HW_VLAN_RX |
4341                                NETIF_F_HW_VLAN_FILTER);
4342
4343 #ifdef CONFIG_PROC_FS
4344         bond_create_proc_entry(bond);
4345 #endif
4346
4347         list_add_tail(&bond->bond_list, &bond_dev_list);
4348
4349         return 0;
4350 }
4351
4352 /* De-initialize device specific data.
4353  * Caller must hold rtnl_lock.
4354  */
4355 void bond_deinit(struct net_device *bond_dev)
4356 {
4357         struct bonding *bond = bond_dev->priv;
4358
4359         list_del(&bond->bond_list);
4360
4361 #ifdef CONFIG_PROC_FS
4362         bond_remove_proc_entry(bond);
4363 #endif
4364 }
4365
4366 /* Unregister and free all bond devices.
4367  * Caller must hold rtnl_lock.
4368  */
4369 static void bond_free_all(void)
4370 {
4371         struct bonding *bond, *nxt;
4372
4373         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4374                 struct net_device *bond_dev = bond->dev;
4375
4376                 bond_mc_list_destroy(bond);
4377                 /* Release the bonded slaves */
4378                 bond_release_all(bond_dev);
4379                 unregister_netdevice(bond_dev);
4380                 bond_deinit(bond_dev);
4381         }
4382
4383 #ifdef CONFIG_PROC_FS
4384         bond_destroy_proc_dir();
4385 #endif
4386 }
4387
4388 /*------------------------- Module initialization ---------------------------*/
4389
4390 /*
4391  * Convert string input module parms.  Accept either the
4392  * number of the mode or its string name.
4393  */
4394 int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
4395 {
4396         int i;
4397
4398         for (i = 0; tbl[i].modename; i++) {
4399                 if ((isdigit(*mode_arg) &&
4400                      tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4401                     (strncmp(mode_arg, tbl[i].modename,
4402                              strlen(tbl[i].modename)) == 0)) {
4403                         return tbl[i].mode;
4404                 }
4405         }
4406
4407         return -1;
4408 }
4409
4410 static int bond_check_params(struct bond_params *params)
4411 {
4412         int arp_validate_value;
4413
4414         /*
4415          * Convert string parameters.
4416          */
4417         if (mode) {
4418                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4419                 if (bond_mode == -1) {
4420                         printk(KERN_ERR DRV_NAME
4421                                ": Error: Invalid bonding mode \"%s\"\n",
4422                                mode == NULL ? "NULL" : mode);
4423                         return -EINVAL;
4424                 }
4425         }
4426
4427         if (xmit_hash_policy) {
4428                 if ((bond_mode != BOND_MODE_XOR) &&
4429                     (bond_mode != BOND_MODE_8023AD)) {
4430                         printk(KERN_INFO DRV_NAME
4431                                ": xor_mode param is irrelevant in mode %s\n",
4432                                bond_mode_name(bond_mode));
4433                 } else {
4434                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4435                                                         xmit_hashtype_tbl);
4436                         if (xmit_hashtype == -1) {
4437                                 printk(KERN_ERR DRV_NAME
4438                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4439                                 xmit_hash_policy == NULL ? "NULL" :
4440                                        xmit_hash_policy);
4441                                 return -EINVAL;
4442                         }
4443                 }
4444         }
4445
4446         if (lacp_rate) {
4447                 if (bond_mode != BOND_MODE_8023AD) {
4448                         printk(KERN_INFO DRV_NAME
4449                                ": lacp_rate param is irrelevant in mode %s\n",
4450                                bond_mode_name(bond_mode));
4451                 } else {
4452                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4453                         if (lacp_fast == -1) {
4454                                 printk(KERN_ERR DRV_NAME
4455                                        ": Error: Invalid lacp rate \"%s\"\n",
4456                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4457                                 return -EINVAL;
4458                         }
4459                 }
4460         }
4461
4462         if (max_bonds < 1 || max_bonds > INT_MAX) {
4463                 printk(KERN_WARNING DRV_NAME
4464                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4465                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4466                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4467                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4468         }
4469
4470         if (miimon < 0) {
4471                 printk(KERN_WARNING DRV_NAME
4472                        ": Warning: miimon module parameter (%d), "
4473                        "not in range 0-%d, so it was reset to %d\n",
4474                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4475                 miimon = BOND_LINK_MON_INTERV;
4476         }
4477
4478         if (updelay < 0) {
4479                 printk(KERN_WARNING DRV_NAME
4480                        ": Warning: updelay module parameter (%d), "
4481                        "not in range 0-%d, so it was reset to 0\n",
4482                        updelay, INT_MAX);
4483                 updelay = 0;
4484         }
4485
4486         if (downdelay < 0) {
4487                 printk(KERN_WARNING DRV_NAME
4488                        ": Warning: downdelay module parameter (%d), "
4489                        "not in range 0-%d, so it was reset to 0\n",
4490                        downdelay, INT_MAX);
4491                 downdelay = 0;
4492         }
4493
4494         if ((use_carrier != 0) && (use_carrier != 1)) {
4495                 printk(KERN_WARNING DRV_NAME
4496                        ": Warning: use_carrier module parameter (%d), "
4497                        "not of valid value (0/1), so it was set to 1\n",
4498                        use_carrier);
4499                 use_carrier = 1;
4500         }
4501
4502         /* reset values for 802.3ad */
4503         if (bond_mode == BOND_MODE_8023AD) {
4504                 if (!miimon) {
4505                         printk(KERN_WARNING DRV_NAME
4506                                ": Warning: miimon must be specified, "
4507                                "otherwise bonding will not detect link "
4508                                "failure, speed and duplex which are "
4509                                "essential for 802.3ad operation\n");
4510                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4511                         miimon = 100;
4512                 }
4513         }
4514
4515         /* reset values for TLB/ALB */
4516         if ((bond_mode == BOND_MODE_TLB) ||
4517             (bond_mode == BOND_MODE_ALB)) {
4518                 if (!miimon) {
4519                         printk(KERN_WARNING DRV_NAME
4520                                ": Warning: miimon must be specified, "
4521                                "otherwise bonding will not detect link "
4522                                "failure and link speed which are essential "
4523                                "for TLB/ALB load balancing\n");
4524                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4525                         miimon = 100;
4526                 }
4527         }
4528
4529         if (bond_mode == BOND_MODE_ALB) {
4530                 printk(KERN_NOTICE DRV_NAME
4531                        ": In ALB mode you might experience client "
4532                        "disconnections upon reconnection of a link if the "
4533                        "bonding module updelay parameter (%d msec) is "
4534                        "incompatible with the forwarding delay time of the "
4535                        "switch\n",
4536                        updelay);
4537         }
4538
4539         if (!miimon) {
4540                 if (updelay || downdelay) {
4541                         /* just warn the user the up/down delay will have
4542                          * no effect since miimon is zero...
4543                          */
4544                         printk(KERN_WARNING DRV_NAME
4545                                ": Warning: miimon module parameter not set "
4546                                "and updelay (%d) or downdelay (%d) module "
4547                                "parameter is set; updelay and downdelay have "
4548                                "no effect unless miimon is set\n",
4549                                updelay, downdelay);
4550                 }
4551         } else {
4552                 /* don't allow arp monitoring */
4553                 if (arp_interval) {
4554                         printk(KERN_WARNING DRV_NAME
4555                                ": Warning: miimon (%d) and arp_interval (%d) "
4556                                "can't be used simultaneously, disabling ARP "
4557                                "monitoring\n",
4558                                miimon, arp_interval);
4559                         arp_interval = 0;
4560                 }
4561
4562                 if ((updelay % miimon) != 0) {
4563                         printk(KERN_WARNING DRV_NAME
4564                                ": Warning: updelay (%d) is not a multiple "
4565                                "of miimon (%d), updelay rounded to %d ms\n",
4566                                updelay, miimon, (updelay / miimon) * miimon);
4567                 }
4568
4569                 updelay /= miimon;
4570
4571                 if ((downdelay % miimon) != 0) {
4572                         printk(KERN_WARNING DRV_NAME
4573                                ": Warning: downdelay (%d) is not a multiple "
4574                                "of miimon (%d), downdelay rounded to %d ms\n",
4575                                downdelay, miimon,
4576                                (downdelay / miimon) * miimon);
4577                 }
4578
4579                 downdelay /= miimon;
4580         }
4581
4582         if (arp_interval < 0) {
4583                 printk(KERN_WARNING DRV_NAME
4584                        ": Warning: arp_interval module parameter (%d) "
4585                        ", not in range 0-%d, so it was reset to %d\n",
4586                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4587                 arp_interval = BOND_LINK_ARP_INTERV;
4588         }
4589
4590         for (arp_ip_count = 0;
4591              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4592              arp_ip_count++) {
4593                 /* not complete check, but should be good enough to
4594                    catch mistakes */
4595                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4596                         printk(KERN_WARNING DRV_NAME
4597                                ": Warning: bad arp_ip_target module parameter "
4598                                "(%s), ARP monitoring will not be performed\n",
4599                                arp_ip_target[arp_ip_count]);
4600                         arp_interval = 0;
4601                 } else {
4602                         u32 ip = in_aton(arp_ip_target[arp_ip_count]);
4603                         arp_target[arp_ip_count] = ip;
4604                 }
4605         }
4606
4607         if (arp_interval && !arp_ip_count) {
4608                 /* don't allow arping if no arp_ip_target given... */
4609                 printk(KERN_WARNING DRV_NAME
4610                        ": Warning: arp_interval module parameter (%d) "
4611                        "specified without providing an arp_ip_target "
4612                        "parameter, arp_interval was reset to 0\n",
4613                        arp_interval);
4614                 arp_interval = 0;
4615         }
4616
4617         if (arp_validate) {
4618                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4619                         printk(KERN_ERR DRV_NAME
4620                ": arp_validate only supported in active-backup mode\n");
4621                         return -EINVAL;
4622                 }
4623                 if (!arp_interval) {
4624                         printk(KERN_ERR DRV_NAME
4625                                ": arp_validate requires arp_interval\n");
4626                         return -EINVAL;
4627                 }
4628
4629                 arp_validate_value = bond_parse_parm(arp_validate,
4630                                                      arp_validate_tbl);
4631                 if (arp_validate_value == -1) {
4632                         printk(KERN_ERR DRV_NAME
4633                                ": Error: invalid arp_validate \"%s\"\n",
4634                                arp_validate == NULL ? "NULL" : arp_validate);
4635                         return -EINVAL;
4636                 }
4637         } else
4638                 arp_validate_value = 0;
4639
4640         if (miimon) {
4641                 printk(KERN_INFO DRV_NAME
4642                        ": MII link monitoring set to %d ms\n",
4643                        miimon);
4644         } else if (arp_interval) {
4645                 int i;
4646
4647                 printk(KERN_INFO DRV_NAME
4648                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4649                        arp_interval,
4650                        arp_validate_tbl[arp_validate_value].modename,
4651                        arp_ip_count);
4652
4653                 for (i = 0; i < arp_ip_count; i++)
4654                         printk (" %s", arp_ip_target[i]);
4655
4656                 printk("\n");
4657
4658         } else {
4659                 /* miimon and arp_interval not set, we need one so things
4660                  * work as expected, see bonding.txt for details
4661                  */
4662                 printk(KERN_WARNING DRV_NAME
4663                        ": Warning: either miimon or arp_interval and "
4664                        "arp_ip_target module parameters must be specified, "
4665                        "otherwise bonding will not detect link failures! see "
4666                        "bonding.txt for details.\n");
4667         }
4668
4669         if (primary && !USES_PRIMARY(bond_mode)) {
4670                 /* currently, using a primary only makes sense
4671                  * in active backup, TLB or ALB modes
4672                  */
4673                 printk(KERN_WARNING DRV_NAME
4674                        ": Warning: %s primary device specified but has no "
4675                        "effect in %s mode\n",
4676                        primary, bond_mode_name(bond_mode));
4677                 primary = NULL;
4678         }
4679
4680         /* fill params struct with the proper values */
4681         params->mode = bond_mode;
4682         params->xmit_policy = xmit_hashtype;
4683         params->miimon = miimon;
4684         params->arp_interval = arp_interval;
4685         params->arp_validate = arp_validate_value;
4686         params->updelay = updelay;
4687         params->downdelay = downdelay;
4688         params->use_carrier = use_carrier;
4689         params->lacp_fast = lacp_fast;
4690         params->primary[0] = 0;
4691
4692         if (primary) {
4693                 strncpy(params->primary, primary, IFNAMSIZ);
4694                 params->primary[IFNAMSIZ - 1] = 0;
4695         }
4696
4697         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4698
4699         return 0;
4700 }
4701
4702 static struct lock_class_key bonding_netdev_xmit_lock_key;
4703
4704 /* Create a new bond based on the specified name and bonding parameters.
4705  * If name is NULL, obtain a suitable "bond%d" name for us.
4706  * Caller must NOT hold rtnl_lock; we need to release it here before we
4707  * set up our sysfs entries.
4708  */
4709 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4710 {
4711         struct net_device *bond_dev;
4712         int res;
4713
4714         rtnl_lock();
4715         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4716                                 ether_setup);
4717         if (!bond_dev) {
4718                 printk(KERN_ERR DRV_NAME
4719                        ": %s: eek! can't alloc netdev!\n",
4720                        name);
4721                 res = -ENOMEM;
4722                 goto out_rtnl;
4723         }
4724
4725         if (!name) {
4726                 res = dev_alloc_name(bond_dev, "bond%d");
4727                 if (res < 0)
4728                         goto out_netdev;
4729         }
4730
4731         /* bond_init() must be called after dev_alloc_name() (for the
4732          * /proc files), but before register_netdevice(), because we
4733          * need to set function pointers.
4734          */
4735
4736         res = bond_init(bond_dev, params);
4737         if (res < 0) {
4738                 goto out_netdev;
4739         }
4740
4741         SET_MODULE_OWNER(bond_dev);
4742
4743         res = register_netdevice(bond_dev);
4744         if (res < 0) {
4745                 goto out_bond;
4746         }
4747
4748         lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4749
4750         if (newbond)
4751                 *newbond = bond_dev->priv;
4752
4753         netif_carrier_off(bond_dev);
4754
4755         rtnl_unlock(); /* allows sysfs registration of net device */
4756         res = bond_create_sysfs_entry(bond_dev->priv);
4757         if (res < 0) {
4758                 rtnl_lock();
4759                 goto out_bond;
4760         }
4761
4762         return 0;
4763
4764 out_bond:
4765         bond_deinit(bond_dev);
4766 out_netdev:
4767         free_netdev(bond_dev);
4768 out_rtnl:
4769         rtnl_unlock();
4770         return res;
4771 }
4772
4773 static int __init bonding_init(void)
4774 {
4775         int i;
4776         int res;
4777
4778         printk(KERN_INFO "%s", version);
4779
4780         res = bond_check_params(&bonding_defaults);
4781         if (res) {
4782                 goto out;
4783         }
4784
4785 #ifdef CONFIG_PROC_FS
4786         bond_create_proc_dir();
4787 #endif
4788         for (i = 0; i < max_bonds; i++) {
4789                 res = bond_create(NULL, &bonding_defaults, NULL);
4790                 if (res)
4791                         goto err;
4792         }
4793
4794         res = bond_create_sysfs();
4795         if (res)
4796                 goto err;
4797
4798         register_netdevice_notifier(&bond_netdev_notifier);
4799         register_inetaddr_notifier(&bond_inetaddr_notifier);
4800
4801         goto out;
4802 err:
4803         rtnl_lock();
4804         bond_free_all();
4805         bond_destroy_sysfs();
4806         rtnl_unlock();
4807 out:
4808         return res;
4809
4810 }
4811
4812 static void __exit bonding_exit(void)
4813 {
4814         unregister_netdevice_notifier(&bond_netdev_notifier);
4815         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4816
4817         rtnl_lock();
4818         bond_free_all();
4819         bond_destroy_sysfs();
4820         rtnl_unlock();
4821 }
4822
4823 module_init(bonding_init);
4824 module_exit(bonding_exit);
4825 MODULE_LICENSE("GPL");
4826 MODULE_VERSION(DRV_VERSION);
4827 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4828 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4829 MODULE_SUPPORTED_DEVICE("most ethernet devices");
4830
4831 /*
4832  * Local variables:
4833  *  c-indent-level: 8
4834  *  c-basic-offset: 8
4835  *  tab-width: 8
4836  * End:
4837  */
4838