drivers/net/bonding/bond_main.c

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