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

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 //#define BONDING_DEBUG 1
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/ptrace.h>
  42 #include <linux/ioport.h>
  43 #include <linux/in.h>
  44 #include <net/ip.h>
  45 #include <linux/ip.h>
  46 #include <linux/tcp.h>
  47 #include <linux/udp.h>
  48 #include <linux/slab.h>
  49 #include <linux/string.h>
  50 #include <linux/init.h>
  51 #include <linux/timer.h>
  52 #include <linux/socket.h>
  53 #include <linux/ctype.h>
  54 #include <linux/inet.h>
  55 #include <linux/bitops.h>
  56 #include <asm/system.h>
  57 #include <asm/io.h>
  58 #include <asm/dma.h>
  59 #include <asm/uaccess.h>
  60 #include <linux/errno.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/inetdevice.h>
  63 #include <linux/igmp.h>
  64 #include <linux/etherdevice.h>
  65 #include <linux/skbuff.h>
  66 #include <net/sock.h>
  67 #include <linux/rtnetlink.h>
  68 #include <linux/proc_fs.h>
  69 #include <linux/seq_file.h>
  70 #include <linux/smp.h>
  71 #include <linux/if_ether.h>
  72 #include <net/arp.h>
  73 #include <linux/mii.h>
  74 #include <linux/ethtool.h>
  75 #include <linux/if_vlan.h>
  76 #include <linux/if_bonding.h>
  77 #include <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         bond_dev->neigh_setup           = slave_dev->neigh_setup;
1261
1262         bond_dev->type              = slave_dev->type;
1263         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1264         bond_dev->addr_len          = slave_dev->addr_len;
1265
1266         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1267                 slave_dev->addr_len);
1268 }
1269
1270 /* enslave device <slave> to bond device <master> */
1271 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1272 {
1273         struct bonding *bond = bond_dev->priv;
1274         struct slave *new_slave = NULL;
1275         struct dev_mc_list *dmi;
1276         struct sockaddr addr;
1277         int link_reporting;
1278         int old_features = bond_dev->features;
1279         int res = 0;
1280
1281         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1282                 slave_dev->do_ioctl == NULL) {
1283                 printk(KERN_WARNING DRV_NAME
1284                        ": %s: Warning: no link monitoring support for %s\n",
1285                        bond_dev->name, slave_dev->name);
1286         }
1287
1288         /* bond must be initialized by bond_open() before enslaving */
1289         if (!(bond_dev->flags & IFF_UP)) {
1290                 printk(KERN_WARNING DRV_NAME
1291                         " %s: master_dev is not up in bond_enslave\n",
1292                         bond_dev->name);
1293         }
1294
1295         /* already enslaved */
1296         if (slave_dev->flags & IFF_SLAVE) {
1297                 dprintk("Error, Device was already enslaved\n");
1298                 return -EBUSY;
1299         }
1300
1301         /* vlan challenged mutual exclusion */
1302         /* no need to lock since we're protected by rtnl_lock */
1303         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1304                 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1305                 if (!list_empty(&bond->vlan_list)) {
1306                         printk(KERN_ERR DRV_NAME
1307                                ": %s: Error: cannot enslave VLAN "
1308                                "challenged slave %s on VLAN enabled "
1309                                "bond %s\n", bond_dev->name, slave_dev->name,
1310                                bond_dev->name);
1311                         return -EPERM;
1312                 } else {
1313                         printk(KERN_WARNING DRV_NAME
1314                                ": %s: Warning: enslaved VLAN challenged "
1315                                "slave %s. Adding VLANs will be blocked as "
1316                                "long as %s is part of bond %s\n",
1317                                bond_dev->name, slave_dev->name, slave_dev->name,
1318                                bond_dev->name);
1319                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1320                 }
1321         } else {
1322                 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1323                 if (bond->slave_cnt == 0) {
1324                         /* First slave, and it is not VLAN challenged,
1325                          * so remove the block of adding VLANs over the bond.
1326                          */
1327                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1328                 }
1329         }
1330
1331         /*
1332          * Old ifenslave binaries are no longer supported.  These can
1333          * be identified with moderate accurary by the state of the slave:
1334          * the current ifenslave will set the interface down prior to
1335          * enslaving it; the old ifenslave will not.
1336          */
1337         if ((slave_dev->flags & IFF_UP)) {
1338                 printk(KERN_ERR DRV_NAME ": %s is up. "
1339                        "This may be due to an out of date ifenslave.\n",
1340                        slave_dev->name);
1341                 res = -EPERM;
1342                 goto err_undo_flags;
1343         }
1344
1345         /* set bonding device ether type by slave - bonding netdevices are
1346          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1347          * there is a need to override some of the type dependent attribs/funcs.
1348          *
1349          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1350          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1351          */
1352         if (bond->slave_cnt == 0) {
1353                 if (slave_dev->type != ARPHRD_ETHER)
1354                         bond_setup_by_slave(bond_dev, slave_dev);
1355         } else if (bond_dev->type != slave_dev->type) {
1356                 printk(KERN_ERR DRV_NAME ": %s ether type (%d) is different "
1357                         "from other slaves (%d), can not enslave it.\n",
1358                         slave_dev->name,
1359                         slave_dev->type, bond_dev->type);
1360                         res = -EINVAL;
1361                         goto err_undo_flags;
1362         }
1363
1364         if (slave_dev->set_mac_address == NULL) {
1365                 if (bond->slave_cnt == 0) {
1366                         printk(KERN_WARNING DRV_NAME
1367                                 ": %s: Warning: The first slave device you "
1368                                 "specified does not support setting the MAC "
1369                                 "address. This bond MAC address would be that "
1370                                 "of the active slave.\n", bond_dev->name);
1371                         bond->do_set_mac_addr = 0;
1372                 } else if (bond->do_set_mac_addr) {
1373                         printk(KERN_ERR DRV_NAME
1374                                 ": %s: Error: The slave device you specified "
1375                                 "does not support setting the MAC addres,."
1376                                 "but this bond uses this practice. \n"
1377                                 , bond_dev->name);
1378                         res = -EOPNOTSUPP;
1379                         goto err_undo_flags;
1380                 }
1381         }
1382
1383         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1384         if (!new_slave) {
1385                 res = -ENOMEM;
1386                 goto err_undo_flags;
1387         }
1388
1389         /* save slave's original flags before calling
1390          * netdev_set_master and dev_open
1391          */
1392         new_slave->original_flags = slave_dev->flags;
1393
1394         /*
1395          * Save slave's original ("permanent") mac address for modes
1396          * that need it, and for restoring it upon release, and then
1397          * set it to the master's address
1398          */
1399         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1400
1401         if (bond->do_set_mac_addr) {
1402                 /*
1403                  * Set slave to master's mac address.  The application already
1404                  * set the master's mac address to that of the first slave
1405                  */
1406                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1407                 addr.sa_family = slave_dev->type;
1408                 res = dev_set_mac_address(slave_dev, &addr);
1409                 if (res) {
1410                         dprintk("Error %d calling set_mac_address\n", res);
1411                         goto err_free;
1412                 }
1413         }
1414
1415         res = netdev_set_master(slave_dev, bond_dev);
1416         if (res) {
1417                 dprintk("Error %d calling netdev_set_master\n", res);
1418                 goto err_close;
1419         }
1420         /* open the slave since the application closed it */
1421         res = dev_open(slave_dev);
1422         if (res) {
1423                 dprintk("Openning slave %s failed\n", slave_dev->name);
1424                 goto err_restore_mac;
1425         }
1426
1427         new_slave->dev = slave_dev;
1428         slave_dev->priv_flags |= IFF_BONDING;
1429
1430         if ((bond->params.mode == BOND_MODE_TLB) ||
1431             (bond->params.mode == BOND_MODE_ALB)) {
1432                 /* bond_alb_init_slave() must be called before all other stages since
1433                  * it might fail and we do not want to have to undo everything
1434                  */
1435                 res = bond_alb_init_slave(bond, new_slave);
1436                 if (res) {
1437                         goto err_unset_master;
1438                 }
1439         }
1440
1441         /* If the mode USES_PRIMARY, then the new slave gets the
1442          * master's promisc (and mc) settings only if it becomes the
1443          * curr_active_slave, and that is taken care of later when calling
1444          * bond_change_active()
1445          */
1446         if (!USES_PRIMARY(bond->params.mode)) {
1447                 /* set promiscuity level to new slave */
1448                 if (bond_dev->flags & IFF_PROMISC) {
1449                         dev_set_promiscuity(slave_dev, 1);
1450                 }
1451
1452                 /* set allmulti level to new slave */
1453                 if (bond_dev->flags & IFF_ALLMULTI) {
1454                         dev_set_allmulti(slave_dev, 1);
1455                 }
1456
1457                 /* upload master's mc_list to new slave */
1458                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1459                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1460                 }
1461         }
1462
1463         if (bond->params.mode == BOND_MODE_8023AD) {
1464                 /* add lacpdu mc addr to mc list */
1465                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1466
1467                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1468         }
1469
1470         bond_add_vlans_on_slave(bond, slave_dev);
1471
1472         write_lock_bh(&bond->lock);
1473
1474         bond_attach_slave(bond, new_slave);
1475
1476         new_slave->delay = 0;
1477         new_slave->link_failure_count = 0;
1478
1479         bond_compute_features(bond);
1480
1481         new_slave->last_arp_rx = jiffies;
1482
1483         if (bond->params.miimon && !bond->params.use_carrier) {
1484                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1485
1486                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1487                         /*
1488                          * miimon is set but a bonded network driver
1489                          * does not support ETHTOOL/MII and
1490                          * arp_interval is not set.  Note: if
1491                          * use_carrier is enabled, we will never go
1492                          * here (because netif_carrier is always
1493                          * supported); thus, we don't need to change
1494                          * the messages for netif_carrier.
1495                          */
1496                         printk(KERN_WARNING DRV_NAME
1497                                ": %s: Warning: MII and ETHTOOL support not "
1498                                "available for interface %s, and "
1499                                "arp_interval/arp_ip_target module parameters "
1500                                "not specified, thus bonding will not detect "
1501                                "link failures! see bonding.txt for details.\n",
1502                                bond_dev->name, slave_dev->name);
1503                 } else if (link_reporting == -1) {
1504                         /* unable get link status using mii/ethtool */
1505                         printk(KERN_WARNING DRV_NAME
1506                                ": %s: Warning: can't get link status from "
1507                                "interface %s; the network driver associated "
1508                                "with this interface does not support MII or "
1509                                "ETHTOOL link status reporting, thus miimon "
1510                                "has no effect on this interface.\n",
1511                                bond_dev->name, slave_dev->name);
1512                 }
1513         }
1514
1515         /* check for initial state */
1516         if (!bond->params.miimon ||
1517             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1518                 if (bond->params.updelay) {
1519                         dprintk("Initial state of slave_dev is "
1520                                 "BOND_LINK_BACK\n");
1521                         new_slave->link  = BOND_LINK_BACK;
1522                         new_slave->delay = bond->params.updelay;
1523                 } else {
1524                         dprintk("Initial state of slave_dev is "
1525                                 "BOND_LINK_UP\n");
1526                         new_slave->link  = BOND_LINK_UP;
1527                 }
1528                 new_slave->jiffies = jiffies;
1529         } else {
1530                 dprintk("Initial state of slave_dev is "
1531                         "BOND_LINK_DOWN\n");
1532                 new_slave->link  = BOND_LINK_DOWN;
1533         }
1534
1535         if (bond_update_speed_duplex(new_slave) &&
1536             (new_slave->link != BOND_LINK_DOWN)) {
1537                 printk(KERN_WARNING DRV_NAME
1538                        ": %s: Warning: failed to get speed and duplex from %s, "
1539                        "assumed to be 100Mb/sec and Full.\n",
1540                        bond_dev->name, new_slave->dev->name);
1541
1542                 if (bond->params.mode == BOND_MODE_8023AD) {
1543                         printk(KERN_WARNING DRV_NAME
1544                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1545                                "support in base driver for proper aggregator "
1546                                "selection.\n", bond_dev->name);
1547                 }
1548         }
1549
1550         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1551                 /* if there is a primary slave, remember it */
1552                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1553                         bond->primary_slave = new_slave;
1554                 }
1555         }
1556
1557         switch (bond->params.mode) {
1558         case BOND_MODE_ACTIVEBACKUP:
1559                 bond_set_slave_inactive_flags(new_slave);
1560                 bond_select_active_slave(bond);
1561                 break;
1562         case BOND_MODE_8023AD:
1563                 /* in 802.3ad mode, the internal mechanism
1564                  * will activate the slaves in the selected
1565                  * aggregator
1566                  */
1567                 bond_set_slave_inactive_flags(new_slave);
1568                 /* if this is the first slave */
1569                 if (bond->slave_cnt == 1) {
1570                         SLAVE_AD_INFO(new_slave).id = 1;
1571                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1572                          * can be called only after the mac address of the bond is set
1573                          */
1574                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1575                                             bond->params.lacp_fast);
1576                 } else {
1577                         SLAVE_AD_INFO(new_slave).id =
1578                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1579                 }
1580
1581                 bond_3ad_bind_slave(new_slave);
1582                 break;
1583         case BOND_MODE_TLB:
1584         case BOND_MODE_ALB:
1585                 new_slave->state = BOND_STATE_ACTIVE;
1586                 if ((!bond->curr_active_slave) &&
1587                     (new_slave->link != BOND_LINK_DOWN)) {
1588                         /* first slave or no active slave yet, and this link
1589                          * is OK, so make this interface the active one
1590                          */
1591                         bond_change_active_slave(bond, new_slave);
1592                 } else {
1593                         bond_set_slave_inactive_flags(new_slave);
1594                 }
1595                 break;
1596         default:
1597                 dprintk("This slave is always active in trunk mode\n");
1598
1599                 /* always active in trunk mode */
1600                 new_slave->state = BOND_STATE_ACTIVE;
1601
1602                 /* In trunking mode there is little meaning to curr_active_slave
1603                  * anyway (it holds no special properties of the bond device),
1604                  * so we can change it without calling change_active_interface()
1605                  */
1606                 if (!bond->curr_active_slave) {
1607                         bond->curr_active_slave = new_slave;
1608                 }
1609                 break;
1610         } /* switch(bond_mode) */
1611
1612         bond_set_carrier(bond);
1613
1614         write_unlock_bh(&bond->lock);
1615
1616         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1617         if (res)
1618                 goto err_unset_master;
1619
1620         printk(KERN_INFO DRV_NAME
1621                ": %s: enslaving %s as a%s interface with a%s link.\n",
1622                bond_dev->name, slave_dev->name,
1623                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1624                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1625
1626         /* enslave is successful */
1627         return 0;
1628
1629 /* Undo stages on error */
1630 err_unset_master:
1631         netdev_set_master(slave_dev, NULL);
1632
1633 err_close:
1634         dev_close(slave_dev);
1635
1636 err_restore_mac:
1637         if (bond->do_set_mac_addr) {
1638                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1639                 addr.sa_family = slave_dev->type;
1640                 dev_set_mac_address(slave_dev, &addr);
1641         }
1642
1643 err_free:
1644         kfree(new_slave);
1645
1646 err_undo_flags:
1647         bond_dev->features = old_features;
1648
1649         return res;
1650 }
1651
1652 /*
1653  * Try to release the slave device <slave> from the bond device <master>
1654  * It is legal to access curr_active_slave without a lock because all the function
1655  * is write-locked.
1656  *
1657  * The rules for slave state should be:
1658  *   for Active/Backup:
1659  *     Active stays on all backups go down
1660  *   for Bonded connections:
1661  *     The first up interface should be left on and all others downed.
1662  */
1663 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1664 {
1665         struct bonding *bond = bond_dev->priv;
1666         struct slave *slave, *oldcurrent;
1667         struct sockaddr addr;
1668         int mac_addr_differ;
1669         DECLARE_MAC_BUF(mac);
1670
1671         /* slave is not a slave or master is not master of this slave */
1672         if (!(slave_dev->flags & IFF_SLAVE) ||
1673             (slave_dev->master != bond_dev)) {
1674                 printk(KERN_ERR DRV_NAME
1675                        ": %s: Error: cannot release %s.\n",
1676                        bond_dev->name, slave_dev->name);
1677                 return -EINVAL;
1678         }
1679
1680         write_lock_bh(&bond->lock);
1681
1682         slave = bond_get_slave_by_dev(bond, slave_dev);
1683         if (!slave) {
1684                 /* not a slave of this bond */
1685                 printk(KERN_INFO DRV_NAME
1686                        ": %s: %s not enslaved\n",
1687                        bond_dev->name, slave_dev->name);
1688                 write_unlock_bh(&bond->lock);
1689                 return -EINVAL;
1690         }
1691
1692         mac_addr_differ = memcmp(bond_dev->dev_addr,
1693                                  slave->perm_hwaddr,
1694                                  ETH_ALEN);
1695         if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1696                 printk(KERN_WARNING DRV_NAME
1697                        ": %s: Warning: the permanent HWaddr of %s - "
1698                        "%s - is still in use by %s. "
1699                        "Set the HWaddr of %s to a different address "
1700                        "to avoid conflicts.\n",
1701                        bond_dev->name,
1702                        slave_dev->name,
1703                        print_mac(mac, slave->perm_hwaddr),
1704                        bond_dev->name,
1705                        slave_dev->name);
1706         }
1707
1708         /* Inform AD package of unbinding of slave. */
1709         if (bond->params.mode == BOND_MODE_8023AD) {
1710                 /* must be called before the slave is
1711                  * detached from the list
1712                  */
1713                 bond_3ad_unbind_slave(slave);
1714         }
1715
1716         printk(KERN_INFO DRV_NAME
1717                ": %s: releasing %s interface %s\n",
1718                bond_dev->name,
1719                (slave->state == BOND_STATE_ACTIVE)
1720                ? "active" : "backup",
1721                slave_dev->name);
1722
1723         oldcurrent = bond->curr_active_slave;
1724
1725         bond->current_arp_slave = NULL;
1726
1727         /* release the slave from its bond */
1728         bond_detach_slave(bond, slave);
1729
1730         bond_compute_features(bond);
1731
1732         if (bond->primary_slave == slave) {
1733                 bond->primary_slave = NULL;
1734         }
1735
1736         if (oldcurrent == slave) {
1737                 bond_change_active_slave(bond, NULL);
1738         }
1739
1740         if ((bond->params.mode == BOND_MODE_TLB) ||
1741             (bond->params.mode == BOND_MODE_ALB)) {
1742                 /* Must be called only after the slave has been
1743                  * detached from the list and the curr_active_slave
1744                  * has been cleared (if our_slave == old_current),
1745                  * but before a new active slave is selected.
1746                  */
1747                 bond_alb_deinit_slave(bond, slave);
1748         }
1749
1750         if (oldcurrent == slave)
1751                 bond_select_active_slave(bond);
1752
1753         if (bond->slave_cnt == 0) {
1754                 bond_set_carrier(bond);
1755
1756                 /* if the last slave was removed, zero the mac address
1757                  * of the master so it will be set by the application
1758                  * to the mac address of the first slave
1759                  */
1760                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1761
1762                 if (list_empty(&bond->vlan_list)) {
1763                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1764                 } else {
1765                         printk(KERN_WARNING DRV_NAME
1766                                ": %s: Warning: clearing HW address of %s while it "
1767                                "still has VLANs.\n",
1768                                bond_dev->name, bond_dev->name);
1769                         printk(KERN_WARNING DRV_NAME
1770                                ": %s: When re-adding slaves, make sure the bond's "
1771                                "HW address matches its VLANs'.\n",
1772                                bond_dev->name);
1773                 }
1774         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1775                    !bond_has_challenged_slaves(bond)) {
1776                 printk(KERN_INFO DRV_NAME
1777                        ": %s: last VLAN challenged slave %s "
1778                        "left bond %s. VLAN blocking is removed\n",
1779                        bond_dev->name, slave_dev->name, bond_dev->name);
1780                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1781         }
1782
1783         write_unlock_bh(&bond->lock);
1784
1785         /* must do this from outside any spinlocks */
1786         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1787
1788         bond_del_vlans_from_slave(bond, slave_dev);
1789
1790         /* If the mode USES_PRIMARY, then we should only remove its
1791          * promisc and mc settings if it was the curr_active_slave, but that was
1792          * already taken care of above when we detached the slave
1793          */
1794         if (!USES_PRIMARY(bond->params.mode)) {
1795                 /* unset promiscuity level from slave */
1796                 if (bond_dev->flags & IFF_PROMISC) {
1797                         dev_set_promiscuity(slave_dev, -1);
1798                 }
1799
1800                 /* unset allmulti level from slave */
1801                 if (bond_dev->flags & IFF_ALLMULTI) {
1802                         dev_set_allmulti(slave_dev, -1);
1803                 }
1804
1805                 /* flush master's mc_list from slave */
1806                 bond_mc_list_flush(bond_dev, slave_dev);
1807         }
1808
1809         netdev_set_master(slave_dev, NULL);
1810
1811         /* close slave before restoring its mac address */
1812         dev_close(slave_dev);
1813
1814         if (bond->do_set_mac_addr) {
1815                 /* restore original ("permanent") mac address */
1816                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1817                 addr.sa_family = slave_dev->type;
1818                 dev_set_mac_address(slave_dev, &addr);
1819         }
1820
1821         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1822                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1823                                    IFF_SLAVE_NEEDARP);
1824
1825         kfree(slave);
1826
1827         return 0;  /* deletion OK */
1828 }
1829
1830 /*
1831  * This function releases all slaves.
1832  */
1833 static int bond_release_all(struct net_device *bond_dev)
1834 {
1835         struct bonding *bond = bond_dev->priv;
1836         struct slave *slave;
1837         struct net_device *slave_dev;
1838         struct sockaddr addr;
1839
1840         write_lock_bh(&bond->lock);
1841
1842         netif_carrier_off(bond_dev);
1843
1844         if (bond->slave_cnt == 0) {
1845                 goto out;
1846         }
1847
1848         bond->current_arp_slave = NULL;
1849         bond->primary_slave = NULL;
1850         bond_change_active_slave(bond, NULL);
1851
1852         while ((slave = bond->first_slave) != NULL) {
1853                 /* Inform AD package of unbinding of slave
1854                  * before slave is detached from the list.
1855                  */
1856                 if (bond->params.mode == BOND_MODE_8023AD) {
1857                         bond_3ad_unbind_slave(slave);
1858                 }
1859
1860                 slave_dev = slave->dev;
1861                 bond_detach_slave(bond, slave);
1862
1863                 if ((bond->params.mode == BOND_MODE_TLB) ||
1864                     (bond->params.mode == BOND_MODE_ALB)) {
1865                         /* must be called only after the slave
1866                          * has been detached from the list
1867                          */
1868                         bond_alb_deinit_slave(bond, slave);
1869                 }
1870
1871                 bond_compute_features(bond);
1872
1873                 /* now that the slave is detached, unlock and perform
1874                  * all the undo steps that should not be called from
1875                  * within a lock.
1876                  */
1877                 write_unlock_bh(&bond->lock);
1878
1879                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1880                 bond_del_vlans_from_slave(bond, slave_dev);
1881
1882                 /* If the mode USES_PRIMARY, then we should only remove its
1883                  * promisc and mc settings if it was the curr_active_slave, but that was
1884                  * already taken care of above when we detached the slave
1885                  */
1886                 if (!USES_PRIMARY(bond->params.mode)) {
1887                         /* unset promiscuity level from slave */
1888                         if (bond_dev->flags & IFF_PROMISC) {
1889                                 dev_set_promiscuity(slave_dev, -1);
1890                         }
1891
1892                         /* unset allmulti level from slave */
1893                         if (bond_dev->flags & IFF_ALLMULTI) {
1894                                 dev_set_allmulti(slave_dev, -1);
1895                         }
1896
1897                         /* flush master's mc_list from slave */
1898                         bond_mc_list_flush(bond_dev, slave_dev);
1899                 }
1900
1901                 netdev_set_master(slave_dev, NULL);
1902
1903                 /* close slave before restoring its mac address */
1904                 dev_close(slave_dev);
1905
1906                 if (bond->do_set_mac_addr) {
1907                         /* restore original ("permanent") mac address*/
1908                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1909                         addr.sa_family = slave_dev->type;
1910                         dev_set_mac_address(slave_dev, &addr);
1911                 }
1912
1913                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1914                                            IFF_SLAVE_INACTIVE);
1915
1916                 kfree(slave);
1917
1918                 /* re-acquire the lock before getting the next slave */
1919                 write_lock_bh(&bond->lock);
1920         }
1921
1922         /* zero the mac address of the master so it will be
1923          * set by the application to the mac address of the
1924          * first slave
1925          */
1926         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1927
1928         if (list_empty(&bond->vlan_list)) {
1929                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1930         } else {
1931                 printk(KERN_WARNING DRV_NAME
1932                        ": %s: Warning: clearing HW address of %s while it "
1933                        "still has VLANs.\n",
1934                        bond_dev->name, bond_dev->name);
1935                 printk(KERN_WARNING DRV_NAME
1936                        ": %s: When re-adding slaves, make sure the bond's "
1937                        "HW address matches its VLANs'.\n",
1938                        bond_dev->name);
1939         }
1940
1941         printk(KERN_INFO DRV_NAME
1942                ": %s: released all slaves\n",
1943                bond_dev->name);
1944
1945 out:
1946         write_unlock_bh(&bond->lock);
1947
1948         return 0;
1949 }
1950
1951 /*
1952  * This function changes the active slave to slave <slave_dev>.
1953  * It returns -EINVAL in the following cases.
1954  *  - <slave_dev> is not found in the list.
1955  *  - There is not active slave now.
1956  *  - <slave_dev> is already active.
1957  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1958  *  - <slave_dev> is not running.
1959  * In these cases, this fuction does nothing.
1960  * In the other cases, currnt_slave pointer is changed and 0 is returned.
1961  */
1962 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1963 {
1964         struct bonding *bond = bond_dev->priv;
1965         struct slave *old_active = NULL;
1966         struct slave *new_active = NULL;
1967         int res = 0;
1968
1969         if (!USES_PRIMARY(bond->params.mode)) {
1970                 return -EINVAL;
1971         }
1972
1973         /* Verify that master_dev is indeed the master of slave_dev */
1974         if (!(slave_dev->flags & IFF_SLAVE) ||
1975             (slave_dev->master != bond_dev)) {
1976                 return -EINVAL;
1977         }
1978
1979         write_lock_bh(&bond->lock);
1980
1981         old_active = bond->curr_active_slave;
1982         new_active = bond_get_slave_by_dev(bond, slave_dev);
1983
1984         /*
1985          * Changing to the current active: do nothing; return success.
1986          */
1987         if (new_active && (new_active == old_active)) {
1988                 write_unlock_bh(&bond->lock);
1989                 return 0;
1990         }
1991
1992         if ((new_active) &&
1993             (old_active) &&
1994             (new_active->link == BOND_LINK_UP) &&
1995             IS_UP(new_active->dev)) {
1996                 bond_change_active_slave(bond, new_active);
1997         } else {
1998                 res = -EINVAL;
1999         }
2000
2001         write_unlock_bh(&bond->lock);
2002
2003         return res;
2004 }
2005
2006 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2007 {
2008         struct bonding *bond = bond_dev->priv;
2009
2010         info->bond_mode = bond->params.mode;
2011         info->miimon = bond->params.miimon;
2012
2013         read_lock_bh(&bond->lock);
2014         info->num_slaves = bond->slave_cnt;
2015         read_unlock_bh(&bond->lock);
2016
2017         return 0;
2018 }
2019
2020 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2021 {
2022         struct bonding *bond = bond_dev->priv;
2023         struct slave *slave;
2024         int i, found = 0;
2025
2026         if (info->slave_id < 0) {
2027                 return -ENODEV;
2028         }
2029
2030         read_lock_bh(&bond->lock);
2031
2032         bond_for_each_slave(bond, slave, i) {
2033                 if (i == (int)info->slave_id) {
2034                         found = 1;
2035                         break;
2036                 }
2037         }
2038
2039         read_unlock_bh(&bond->lock);
2040
2041         if (found) {
2042                 strcpy(info->slave_name, slave->dev->name);
2043                 info->link = slave->link;
2044                 info->state = slave->state;
2045                 info->link_failure_count = slave->link_failure_count;
2046         } else {
2047                 return -ENODEV;
2048         }
2049
2050         return 0;
2051 }
2052
2053 /*-------------------------------- Monitoring -------------------------------*/
2054
2055 /* this function is called regularly to monitor each slave's link. */
2056 void bond_mii_monitor(struct net_device *bond_dev)
2057 {
2058         struct bonding *bond = bond_dev->priv;
2059         struct slave *slave, *oldcurrent;
2060         int do_failover = 0;
2061         int delta_in_ticks;
2062         int i;
2063
2064         read_lock(&bond->lock);
2065
2066         delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2067
2068         if (bond->kill_timers) {
2069                 goto out;
2070         }
2071
2072         if (bond->slave_cnt == 0) {
2073                 goto re_arm;
2074         }
2075
2076         /* we will try to read the link status of each of our slaves, and
2077          * set their IFF_RUNNING flag appropriately. For each slave not
2078          * supporting MII status, we won't do anything so that a user-space
2079          * program could monitor the link itself if needed.
2080          */
2081
2082         if (bond->send_grat_arp) {
2083                 if (bond->curr_active_slave && test_bit(__LINK_STATE_LINKWATCH_PENDING,
2084                                 &bond->curr_active_slave->dev->state))
2085                         dprintk("Needs to send gratuitous arp but not yet\n");
2086                 else {
2087                         dprintk("sending delayed gratuitous arp on on %s\n",
2088                                 bond->curr_active_slave->dev->name);
2089                         bond_send_gratuitous_arp(bond);
2090                         bond->send_grat_arp = 0;
2091                 }
2092         }
2093         read_lock(&bond->curr_slave_lock);
2094         oldcurrent = bond->curr_active_slave;
2095         read_unlock(&bond->curr_slave_lock);
2096
2097         bond_for_each_slave(bond, slave, i) {
2098                 struct net_device *slave_dev = slave->dev;
2099                 int link_state;
2100                 u16 old_speed = slave->speed;
2101                 u8 old_duplex = slave->duplex;
2102
2103                 link_state = bond_check_dev_link(bond, slave_dev, 0);
2104
2105                 switch (slave->link) {
2106                 case BOND_LINK_UP:      /* the link was up */
2107                         if (link_state == BMSR_LSTATUS) {
2108                                 /* link stays up, nothing more to do */
2109                                 break;
2110                         } else { /* link going down */
2111                                 slave->link  = BOND_LINK_FAIL;
2112                                 slave->delay = bond->params.downdelay;
2113
2114                                 if (slave->link_failure_count < UINT_MAX) {
2115                                         slave->link_failure_count++;
2116                                 }
2117
2118                                 if (bond->params.downdelay) {
2119                                         printk(KERN_INFO DRV_NAME
2120                                                ": %s: link status down for %s "
2121                                                "interface %s, disabling it in "
2122                                                "%d ms.\n",
2123                                                bond_dev->name,
2124                                                IS_UP(slave_dev)
2125                                                ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2126                                                   ? ((slave == oldcurrent)
2127                                                      ? "active " : "backup ")
2128                                                   : "")
2129                                                : "idle ",
2130                                                slave_dev->name,
2131                                                bond->params.downdelay * bond->params.miimon);
2132                                 }
2133                         }
2134                         /* no break ! fall through the BOND_LINK_FAIL test to
2135                            ensure proper action to be taken
2136                         */
2137                 case BOND_LINK_FAIL:    /* the link has just gone down */
2138                         if (link_state != BMSR_LSTATUS) {
2139                                 /* link stays down */
2140                                 if (slave->delay <= 0) {
2141                                         /* link down for too long time */
2142                                         slave->link = BOND_LINK_DOWN;
2143
2144                                         /* in active/backup mode, we must
2145                                          * completely disable this interface
2146                                          */
2147                                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2148                                             (bond->params.mode == BOND_MODE_8023AD)) {
2149                                                 bond_set_slave_inactive_flags(slave);
2150                                         }
2151
2152                                         printk(KERN_INFO DRV_NAME
2153                                                ": %s: link status definitely "
2154                                                "down for interface %s, "
2155                                                "disabling it\n",
2156                                                bond_dev->name,
2157                                                slave_dev->name);
2158
2159                                         /* notify ad that the link status has changed */
2160                                         if (bond->params.mode == BOND_MODE_8023AD) {
2161                                                 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2162                                         }
2163
2164                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2165                                             (bond->params.mode == BOND_MODE_ALB)) {
2166                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2167                                         }
2168
2169                                         if (slave == oldcurrent) {
2170                                                 do_failover = 1;
2171                                         }
2172                                 } else {
2173                                         slave->delay--;
2174                                 }
2175                         } else {
2176                                 /* link up again */
2177                                 slave->link  = BOND_LINK_UP;
2178                                 slave->jiffies = jiffies;
2179                                 printk(KERN_INFO DRV_NAME
2180                                        ": %s: link status up again after %d "
2181                                        "ms for interface %s.\n",
2182                                        bond_dev->name,
2183                                        (bond->params.downdelay - slave->delay) * bond->params.miimon,
2184                                        slave_dev->name);
2185                         }
2186                         break;
2187                 case BOND_LINK_DOWN:    /* the link was down */
2188                         if (link_state != BMSR_LSTATUS) {
2189                                 /* the link stays down, nothing more to do */
2190                                 break;
2191                         } else {        /* link going up */
2192                                 slave->link  = BOND_LINK_BACK;
2193                                 slave->delay = bond->params.updelay;
2194
2195                                 if (bond->params.updelay) {
2196                                         /* if updelay == 0, no need to
2197                                            advertise about a 0 ms delay */
2198                                         printk(KERN_INFO DRV_NAME
2199                                                ": %s: link status up for "
2200                                                "interface %s, enabling it "
2201                                                "in %d ms.\n",
2202                                                bond_dev->name,
2203                                                slave_dev->name,
2204                                                bond->params.updelay * bond->params.miimon);
2205                                 }
2206                         }
2207                         /* no break ! fall through the BOND_LINK_BACK state in
2208                            case there's something to do.
2209                         */
2210                 case BOND_LINK_BACK:    /* the link has just come back */
2211                         if (link_state != BMSR_LSTATUS) {
2212                                 /* link down again */
2213                                 slave->link  = BOND_LINK_DOWN;
2214
2215                                 printk(KERN_INFO DRV_NAME
2216                                        ": %s: link status down again after %d "
2217                                        "ms for interface %s.\n",
2218                                        bond_dev->name,
2219                                        (bond->params.updelay - slave->delay) * bond->params.miimon,
2220                                        slave_dev->name);
2221                         } else {
2222                                 /* link stays up */
2223                                 if (slave->delay == 0) {
2224                                         /* now the link has been up for long time enough */
2225                                         slave->link = BOND_LINK_UP;
2226                                         slave->jiffies = jiffies;
2227
2228                                         if (bond->params.mode == BOND_MODE_8023AD) {
2229                                                 /* prevent it from being the active one */
2230                                                 slave->state = BOND_STATE_BACKUP;
2231                                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2232                                                 /* make it immediately active */
2233                                                 slave->state = BOND_STATE_ACTIVE;
2234                                         } else if (slave != bond->primary_slave) {
2235                                                 /* prevent it from being the active one */
2236                                                 slave->state = BOND_STATE_BACKUP;
2237                                         }
2238
2239                                         printk(KERN_INFO DRV_NAME
2240                                                ": %s: link status definitely "
2241                                                "up for interface %s.\n",
2242                                                bond_dev->name,
2243                                                slave_dev->name);
2244
2245                                         /* notify ad that the link status has changed */
2246                                         if (bond->params.mode == BOND_MODE_8023AD) {
2247                                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2248                                         }
2249
2250                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2251                                             (bond->params.mode == BOND_MODE_ALB)) {
2252                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2253                                         }
2254
2255                                         if ((!oldcurrent) ||
2256                                             (slave == bond->primary_slave)) {
2257                                                 do_failover = 1;
2258                                         }
2259                                 } else {
2260                                         slave->delay--;
2261                                 }
2262                         }
2263                         break;
2264                 default:
2265                         /* Should not happen */
2266                         printk(KERN_ERR DRV_NAME
2267                                ": %s: Error: %s Illegal value (link=%d)\n",
2268                                bond_dev->name,
2269                                slave->dev->name,
2270                                slave->link);
2271                         goto out;
2272                 } /* end of switch (slave->link) */
2273
2274                 bond_update_speed_duplex(slave);
2275
2276                 if (bond->params.mode == BOND_MODE_8023AD) {
2277                         if (old_speed != slave->speed) {
2278                                 bond_3ad_adapter_speed_changed(slave);
2279                         }
2280
2281                         if (old_duplex != slave->duplex) {
2282                                 bond_3ad_adapter_duplex_changed(slave);
2283                         }
2284                 }
2285
2286         } /* end of for */
2287
2288         if (do_failover) {
2289                 write_lock(&bond->curr_slave_lock);
2290
2291                 bond_select_active_slave(bond);
2292
2293                 write_unlock(&bond->curr_slave_lock);
2294         } else
2295                 bond_set_carrier(bond);
2296
2297 re_arm:
2298         if (bond->params.miimon) {
2299                 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2300         }
2301 out:
2302         read_unlock(&bond->lock);
2303 }
2304
2305
2306 static __be32 bond_glean_dev_ip(struct net_device *dev)
2307 {
2308         struct in_device *idev;
2309         struct in_ifaddr *ifa;
2310         __be32 addr = 0;
2311
2312         if (!dev)
2313                 return 0;
2314
2315         rcu_read_lock();
2316         idev = __in_dev_get_rcu(dev);
2317         if (!idev)
2318                 goto out;
2319
2320         ifa = idev->ifa_list;
2321         if (!ifa)
2322                 goto out;
2323
2324         addr = ifa->ifa_local;
2325 out:
2326         rcu_read_unlock();
2327         return addr;
2328 }
2329
2330 static int bond_has_ip(struct bonding *bond)
2331 {
2332         struct vlan_entry *vlan, *vlan_next;
2333
2334         if (bond->master_ip)
2335                 return 1;
2336
2337         if (list_empty(&bond->vlan_list))
2338                 return 0;
2339
2340         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2341                                  vlan_list) {
2342                 if (vlan->vlan_ip)
2343                         return 1;
2344         }
2345
2346         return 0;
2347 }
2348
2349 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2350 {
2351         struct vlan_entry *vlan, *vlan_next;
2352
2353         if (ip == bond->master_ip)
2354                 return 1;
2355
2356         if (list_empty(&bond->vlan_list))
2357                 return 0;
2358
2359         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2360                                  vlan_list) {
2361                 if (ip == vlan->vlan_ip)
2362                         return 1;
2363         }
2364
2365         return 0;
2366 }
2367
2368 /*
2369  * We go to the (large) trouble of VLAN tagging ARP frames because
2370  * switches in VLAN mode (especially if ports are configured as
2371  * "native" to a VLAN) might not pass non-tagged frames.
2372  */
2373 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2374 {
2375         struct sk_buff *skb;
2376
2377         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2378                slave_dev->name, dest_ip, src_ip, vlan_id);
2379
2380         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2381                          NULL, slave_dev->dev_addr, NULL);
2382
2383         if (!skb) {
2384                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2385                 return;
2386         }
2387         if (vlan_id) {
2388                 skb = vlan_put_tag(skb, vlan_id);
2389                 if (!skb) {
2390                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2391                         return;
2392                 }
2393         }
2394         arp_xmit(skb);
2395 }
2396
2397
2398 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2399 {
2400         int i, vlan_id, rv;
2401         __be32 *targets = bond->params.arp_targets;
2402         struct vlan_entry *vlan, *vlan_next;
2403         struct net_device *vlan_dev;
2404         struct flowi fl;
2405         struct rtable *rt;
2406
2407         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2408                 if (!targets[i])
2409                         continue;
2410                 dprintk("basa: target %x\n", targets[i]);
2411                 if (list_empty(&bond->vlan_list)) {
2412                         dprintk("basa: empty vlan: arp_send\n");
2413                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2414                                       bond->master_ip, 0);
2415                         continue;
2416                 }
2417
2418                 /*
2419                  * If VLANs are configured, we do a route lookup to
2420                  * determine which VLAN interface would be used, so we
2421                  * can tag the ARP with the proper VLAN tag.
2422                  */
2423                 memset(&fl, 0, sizeof(fl));
2424                 fl.fl4_dst = targets[i];
2425                 fl.fl4_tos = RTO_ONLINK;
2426
2427                 rv = ip_route_output_key(&rt, &fl);
2428                 if (rv) {
2429                         if (net_ratelimit()) {
2430                                 printk(KERN_WARNING DRV_NAME
2431                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2432                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2433                         }
2434                         continue;
2435                 }
2436
2437                 /*
2438                  * This target is not on a VLAN
2439                  */
2440                 if (rt->u.dst.dev == bond->dev) {
2441                         ip_rt_put(rt);
2442                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2443                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2444                                       bond->master_ip, 0);
2445                         continue;
2446                 }
2447
2448                 vlan_id = 0;
2449                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2450                                          vlan_list) {
2451                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2452                         if (vlan_dev == rt->u.dst.dev) {
2453                                 vlan_id = vlan->vlan_id;
2454                                 dprintk("basa: vlan match on %s %d\n",
2455                                        vlan_dev->name, vlan_id);
2456                                 break;
2457                         }
2458                 }
2459
2460                 if (vlan_id) {
2461                         ip_rt_put(rt);
2462                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2463                                       vlan->vlan_ip, vlan_id);
2464                         continue;
2465                 }
2466
2467                 if (net_ratelimit()) {
2468                         printk(KERN_WARNING DRV_NAME
2469                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2470                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2471                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2472                 }
2473                 ip_rt_put(rt);
2474         }
2475 }
2476
2477 /*
2478  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2479  * for each VLAN above us.
2480  */
2481 static void bond_send_gratuitous_arp(struct bonding *bond)
2482 {
2483         struct slave *slave = bond->curr_active_slave;
2484         struct vlan_entry *vlan;
2485         struct net_device *vlan_dev;
2486
2487         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2488                                 slave ? slave->dev->name : "NULL");
2489         if (!slave)
2490                 return;
2491
2492         if (bond->master_ip) {
2493                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2494                                 bond->master_ip, 0);
2495         }
2496
2497         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2498                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2499                 if (vlan->vlan_ip) {
2500                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2501                                       vlan->vlan_ip, vlan->vlan_id);
2502                 }
2503         }
2504 }
2505
2506 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2507 {
2508         int i;
2509         __be32 *targets = bond->params.arp_targets;
2510
2511         targets = bond->params.arp_targets;
2512         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2513                 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2514                         "%u.%u.%u.%u bhti(tip) %d\n",
2515                        NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2516                        bond_has_this_ip(bond, tip));
2517                 if (sip == targets[i]) {
2518                         if (bond_has_this_ip(bond, tip))
2519                                 slave->last_arp_rx = jiffies;
2520                         return;
2521                 }
2522         }
2523 }
2524
2525 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2526 {
2527         struct arphdr *arp;
2528         struct slave *slave;
2529         struct bonding *bond;
2530         unsigned char *arp_ptr;
2531         __be32 sip, tip;
2532
2533         if (dev->nd_net != &init_net)
2534                 goto out;
2535
2536         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2537                 goto out;
2538
2539         bond = dev->priv;
2540         read_lock(&bond->lock);
2541
2542         dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2543                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2544                 orig_dev ? orig_dev->name : "NULL");
2545
2546         slave = bond_get_slave_by_dev(bond, orig_dev);
2547         if (!slave || !slave_do_arp_validate(bond, slave))
2548                 goto out_unlock;
2549
2550         /* ARP header, plus 2 device addresses, plus 2 IP addresses.  */
2551         if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
2552                                  (2 * dev->addr_len) +
2553                                  (2 * sizeof(u32)))))
2554                 goto out_unlock;
2555
2556         arp = arp_hdr(skb);
2557         if (arp->ar_hln != dev->addr_len ||
2558             skb->pkt_type == PACKET_OTHERHOST ||
2559             skb->pkt_type == PACKET_LOOPBACK ||
2560             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2561             arp->ar_pro != htons(ETH_P_IP) ||
2562             arp->ar_pln != 4)
2563                 goto out_unlock;
2564
2565         arp_ptr = (unsigned char *)(arp + 1);
2566         arp_ptr += dev->addr_len;
2567         memcpy(&sip, arp_ptr, 4);
2568         arp_ptr += 4 + dev->addr_len;
2569         memcpy(&tip, arp_ptr, 4);
2570
2571         dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2572                 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2573                 slave->state, bond->params.arp_validate,
2574                 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2575
2576         /*
2577          * Backup slaves won't see the ARP reply, but do come through
2578          * here for each ARP probe (so we swap the sip/tip to validate
2579          * the probe).  In a "redundant switch, common router" type of
2580          * configuration, the ARP probe will (hopefully) travel from
2581          * the active, through one switch, the router, then the other
2582          * switch before reaching the backup.
2583          */
2584         if (slave->state == BOND_STATE_ACTIVE)
2585                 bond_validate_arp(bond, slave, sip, tip);
2586         else
2587                 bond_validate_arp(bond, slave, tip, sip);
2588
2589 out_unlock:
2590         read_unlock(&bond->lock);
2591 out:
2592         dev_kfree_skb(skb);
2593         return NET_RX_SUCCESS;
2594 }
2595
2596 /*
2597  * this function is called regularly to monitor each slave's link
2598  * ensuring that traffic is being sent and received when arp monitoring
2599  * is used in load-balancing mode. if the adapter has been dormant, then an
2600  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2601  * arp monitoring in active backup mode.
2602  */
2603 void bond_loadbalance_arp_mon(struct net_device *bond_dev)
2604 {
2605         struct bonding *bond = bond_dev->priv;
2606         struct slave *slave, *oldcurrent;
2607         int do_failover = 0;
2608         int delta_in_ticks;
2609         int i;
2610
2611         read_lock(&bond->lock);
2612
2613         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2614
2615         if (bond->kill_timers) {
2616                 goto out;
2617         }
2618
2619         if (bond->slave_cnt == 0) {
2620                 goto re_arm;
2621         }
2622
2623         read_lock(&bond->curr_slave_lock);
2624         oldcurrent = bond->curr_active_slave;
2625         read_unlock(&bond->curr_slave_lock);
2626
2627         /* see if any of the previous devices are up now (i.e. they have
2628          * xmt and rcv traffic). the curr_active_slave does not come into
2629          * the picture unless it is null. also, slave->jiffies is not needed
2630          * here because we send an arp on each slave and give a slave as
2631          * long as it needs to get the tx/rx within the delta.
2632          * TODO: what about up/down delay in arp mode? it wasn't here before
2633          *       so it can wait
2634          */
2635         bond_for_each_slave(bond, slave, i) {
2636                 if (slave->link != BOND_LINK_UP) {
2637                         if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2638                             ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2639
2640                                 slave->link  = BOND_LINK_UP;
2641                                 slave->state = BOND_STATE_ACTIVE;
2642
2643                                 /* primary_slave has no meaning in round-robin
2644                                  * mode. the window of a slave being up and
2645                                  * curr_active_slave being null after enslaving
2646                                  * is closed.
2647                                  */
2648                                 if (!oldcurrent) {
2649                                         printk(KERN_INFO DRV_NAME
2650                                                ": %s: link status definitely "
2651                                                "up for interface %s, ",
2652                                                bond_dev->name,
2653                                                slave->dev->name);
2654                                         do_failover = 1;
2655                                 } else {
2656                                         printk(KERN_INFO DRV_NAME
2657                                                ": %s: interface %s is now up\n",
2658                                                bond_dev->name,
2659                                                slave->dev->name);
2660                                 }
2661                         }
2662                 } else {
2663                         /* slave->link == BOND_LINK_UP */
2664
2665                         /* not all switches will respond to an arp request
2666                          * when the source ip is 0, so don't take the link down
2667                          * if we don't know our ip yet
2668                          */
2669                         if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2670                             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2671                              bond_has_ip(bond))) {
2672
2673                                 slave->link  = BOND_LINK_DOWN;
2674                                 slave->state = BOND_STATE_BACKUP;
2675
2676                                 if (slave->link_failure_count < UINT_MAX) {
2677                                         slave->link_failure_count++;
2678                                 }
2679
2680                                 printk(KERN_INFO DRV_NAME
2681                                        ": %s: interface %s is now down.\n",
2682                                        bond_dev->name,
2683                                        slave->dev->name);
2684
2685                                 if (slave == oldcurrent) {
2686                                         do_failover = 1;
2687                                 }
2688                         }
2689                 }
2690
2691                 /* note: if switch is in round-robin mode, all links
2692                  * must tx arp to ensure all links rx an arp - otherwise
2693                  * links may oscillate or not come up at all; if switch is
2694                  * in something like xor mode, there is nothing we can
2695                  * do - all replies will be rx'ed on same link causing slaves
2696                  * to be unstable during low/no traffic periods
2697                  */
2698                 if (IS_UP(slave->dev)) {
2699                         bond_arp_send_all(bond, slave);
2700                 }
2701         }
2702
2703         if (do_failover) {
2704                 write_lock(&bond->curr_slave_lock);
2705
2706                 bond_select_active_slave(bond);
2707
2708                 write_unlock(&bond->curr_slave_lock);
2709         }
2710
2711 re_arm:
2712         if (bond->params.arp_interval) {
2713                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2714         }
2715 out:
2716         read_unlock(&bond->lock);
2717 }
2718
2719 /*
2720  * When using arp monitoring in active-backup mode, this function is
2721  * called to determine if any backup slaves have went down or a new
2722  * current slave needs to be found.
2723  * The backup slaves never generate traffic, they are considered up by merely
2724  * receiving traffic. If the current slave goes down, each backup slave will
2725  * be given the opportunity to tx/rx an arp before being taken down - this
2726  * prevents all slaves from being taken down due to the current slave not
2727  * sending any traffic for the backups to receive. The arps are not necessarily
2728  * necessary, any tx and rx traffic will keep the current slave up. While any
2729  * rx traffic will keep the backup slaves up, the current slave is responsible
2730  * for generating traffic to keep them up regardless of any other traffic they
2731  * may have received.
2732  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2733  */
2734 void bond_activebackup_arp_mon(struct net_device *bond_dev)
2735 {
2736         struct bonding *bond = bond_dev->priv;
2737         struct slave *slave;
2738         int delta_in_ticks;
2739         int i;
2740
2741         read_lock(&bond->lock);
2742
2743         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2744
2745         if (bond->kill_timers) {
2746                 goto out;
2747         }
2748
2749         if (bond->slave_cnt == 0) {
2750                 goto re_arm;
2751         }
2752
2753         /* determine if any slave has come up or any backup slave has
2754          * gone down
2755          * TODO: what about up/down delay in arp mode? it wasn't here before
2756          *       so it can wait
2757          */
2758         bond_for_each_slave(bond, slave, i) {
2759                 if (slave->link != BOND_LINK_UP) {
2760                         if ((jiffies - slave_last_rx(bond, slave)) <=
2761                              delta_in_ticks) {
2762
2763                                 slave->link = BOND_LINK_UP;
2764
2765                                 write_lock(&bond->curr_slave_lock);
2766
2767                                 if ((!bond->curr_active_slave) &&
2768                                     ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2769                                         bond_change_active_slave(bond, slave);
2770                                         bond->current_arp_slave = NULL;
2771                                 } else if (bond->curr_active_slave != slave) {
2772                                         /* this slave has just come up but we
2773                                          * already have a current slave; this
2774                                          * can also happen if bond_enslave adds
2775                                          * a new slave that is up while we are
2776                                          * searching for a new slave
2777                                          */
2778                                         bond_set_slave_inactive_flags(slave);
2779                                         bond->current_arp_slave = NULL;
2780                                 }
2781
2782                                 bond_set_carrier(bond);
2783
2784                                 if (slave == bond->curr_active_slave) {
2785                                         printk(KERN_INFO DRV_NAME
2786                                                ": %s: %s is up and now the "
2787                                                "active interface\n",
2788                                                bond_dev->name,
2789                                                slave->dev->name);
2790                                         netif_carrier_on(bond->dev);
2791                                 } else {
2792                                         printk(KERN_INFO DRV_NAME
2793                                                ": %s: backup interface %s is "
2794                                                "now up\n",
2795                                                bond_dev->name,
2796                                                slave->dev->name);
2797                                 }
2798
2799                                 write_unlock(&bond->curr_slave_lock);
2800                         }
2801                 } else {
2802                         read_lock(&bond->curr_slave_lock);
2803
2804                         if ((slave != bond->curr_active_slave) &&
2805                             (!bond->current_arp_slave) &&
2806                             (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
2807                              bond_has_ip(bond))) {
2808                                 /* a backup slave has gone down; three times
2809                                  * the delta allows the current slave to be
2810                                  * taken out before the backup slave.
2811                                  * note: a non-null current_arp_slave indicates
2812                                  * the curr_active_slave went down and we are
2813                                  * searching for a new one; under this
2814                                  * condition we only take the curr_active_slave
2815                                  * down - this gives each slave a chance to
2816                                  * tx/rx traffic before being taken out
2817                                  */
2818
2819                                 read_unlock(&bond->curr_slave_lock);
2820
2821                                 slave->link  = BOND_LINK_DOWN;
2822
2823                                 if (slave->link_failure_count < UINT_MAX) {
2824                                         slave->link_failure_count++;
2825                                 }
2826
2827                                 bond_set_slave_inactive_flags(slave);
2828
2829                                 printk(KERN_INFO DRV_NAME
2830                                        ": %s: backup interface %s is now down\n",
2831                                        bond_dev->name,
2832                                        slave->dev->name);
2833                         } else {
2834                                 read_unlock(&bond->curr_slave_lock);
2835                         }
2836                 }
2837         }
2838
2839         read_lock(&bond->curr_slave_lock);
2840         slave = bond->curr_active_slave;
2841         read_unlock(&bond->curr_slave_lock);
2842
2843         if (slave) {
2844                 /* if we have sent traffic in the past 2*arp_intervals but
2845                  * haven't xmit and rx traffic in that time interval, select
2846                  * a different slave. slave->jiffies is only updated when
2847                  * a slave first becomes the curr_active_slave - not necessarily
2848                  * after every arp; this ensures the slave has a full 2*delta
2849                  * before being taken out. if a primary is being used, check
2850                  * if it is up and needs to take over as the curr_active_slave
2851                  */
2852                 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2853             (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
2854              bond_has_ip(bond))) &&
2855                     ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2856
2857                         slave->link  = BOND_LINK_DOWN;
2858
2859                         if (slave->link_failure_count < UINT_MAX) {
2860                                 slave->link_failure_count++;
2861                         }
2862
2863                         printk(KERN_INFO DRV_NAME
2864                                ": %s: link status down for active interface "
2865                                "%s, disabling it\n",
2866                                bond_dev->name,
2867                                slave->dev->name);
2868
2869                         write_lock(&bond->curr_slave_lock);
2870
2871                         bond_select_active_slave(bond);
2872                         slave = bond->curr_active_slave;
2873
2874                         write_unlock(&bond->curr_slave_lock);
2875
2876                         bond->current_arp_slave = slave;
2877
2878                         if (slave) {
2879                                 slave->jiffies = jiffies;
2880                         }
2881                 } else if ((bond->primary_slave) &&
2882                            (bond->primary_slave != slave) &&
2883                            (bond->primary_slave->link == BOND_LINK_UP)) {
2884                         /* at this point, slave is the curr_active_slave */
2885                         printk(KERN_INFO DRV_NAME
2886                                ": %s: changing from interface %s to primary "
2887                                "interface %s\n",
2888                                bond_dev->name,
2889                                slave->dev->name,
2890                                bond->primary_slave->dev->name);
2891
2892                         /* primary is up so switch to it */
2893                         write_lock(&bond->curr_slave_lock);
2894                         bond_change_active_slave(bond, bond->primary_slave);
2895                         write_unlock(&bond->curr_slave_lock);
2896
2897                         slave = bond->primary_slave;
2898                         slave->jiffies = jiffies;
2899                 } else {
2900                         bond->current_arp_slave = NULL;
2901                 }
2902
2903                 /* the current slave must tx an arp to ensure backup slaves
2904                  * rx traffic
2905                  */
2906                 if (slave && bond_has_ip(bond)) {
2907                         bond_arp_send_all(bond, slave);
2908                 }
2909         }
2910
2911         /* if we don't have a curr_active_slave, search for the next available
2912          * backup slave from the current_arp_slave and make it the candidate
2913          * for becoming the curr_active_slave
2914          */
2915         if (!slave) {
2916                 if (!bond->current_arp_slave) {
2917                         bond->current_arp_slave = bond->first_slave;
2918                 }
2919
2920                 if (bond->current_arp_slave) {
2921                         bond_set_slave_inactive_flags(bond->current_arp_slave);
2922
2923                         /* search for next candidate */
2924                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2925                                 if (IS_UP(slave->dev)) {
2926                                         slave->link = BOND_LINK_BACK;
2927                                         bond_set_slave_active_flags(slave);
2928                                         bond_arp_send_all(bond, slave);
2929                                         slave->jiffies = jiffies;
2930                                         bond->current_arp_slave = slave;
2931                                         break;
2932                                 }
2933
2934                                 /* if the link state is up at this point, we
2935                                  * mark it down - this can happen if we have
2936                                  * simultaneous link failures and
2937                                  * reselect_active_interface doesn't make this
2938                                  * one the current slave so it is still marked
2939                                  * up when it is actually down
2940                                  */
2941                                 if (slave->link == BOND_LINK_UP) {
2942                                         slave->link  = BOND_LINK_DOWN;
2943                                         if (slave->link_failure_count < UINT_MAX) {
2944                                                 slave->link_failure_count++;
2945                                         }
2946
2947                                         bond_set_slave_inactive_flags(slave);
2948
2949                                         printk(KERN_INFO DRV_NAME
2950                                                ": %s: backup interface %s is "
2951                                                "now down.\n",
2952                                                bond_dev->name,
2953                                                slave->dev->name);
2954                                 }
2955                         }
2956                 }
2957         }
2958
2959 re_arm:
2960         if (bond->params.arp_interval) {
2961                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2962         }
2963 out:
2964         read_unlock(&bond->lock);
2965 }
2966
2967 /*------------------------------ proc/seq_file-------------------------------*/
2968
2969 #ifdef CONFIG_PROC_FS
2970
2971 #define SEQ_START_TOKEN ((void *)1)
2972
2973 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2974 {
2975         struct bonding *bond = seq->private;
2976         loff_t off = 0;
2977         struct slave *slave;
2978         int i;
2979
2980         /* make sure the bond won't be taken away */
2981         read_lock(&dev_base_lock);
2982         read_lock_bh(&bond->lock);
2983
2984         if (*pos == 0) {
2985                 return SEQ_START_TOKEN;
2986         }
2987
2988         bond_for_each_slave(bond, slave, i) {
2989                 if (++off == *pos) {
2990                         return slave;
2991                 }
2992         }
2993
2994         return NULL;
2995 }
2996
2997 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2998 {
2999         struct bonding *bond = seq->private;
3000         struct slave *slave = v;
3001
3002         ++*pos;
3003         if (v == SEQ_START_TOKEN) {
3004                 return bond->first_slave;
3005         }
3006
3007         slave = slave->next;
3008
3009         return (slave == bond->first_slave) ? NULL : slave;
3010 }
3011
3012 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3013 {
3014         struct bonding *bond = seq->private;
3015
3016         read_unlock_bh(&bond->lock);
3017         read_unlock(&dev_base_lock);
3018 }
3019
3020 static void bond_info_show_master(struct seq_file *seq)
3021 {
3022         struct bonding *bond = seq->private;
3023         struct slave *curr;
3024         int i;
3025         u32 target;
3026
3027         read_lock(&bond->curr_slave_lock);
3028         curr = bond->curr_active_slave;
3029         read_unlock(&bond->curr_slave_lock);
3030
3031         seq_printf(seq, "Bonding Mode: %s\n",
3032                    bond_mode_name(bond->params.mode));
3033
3034         if (bond->params.mode == BOND_MODE_XOR ||
3035                 bond->params.mode == BOND_MODE_8023AD) {
3036                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3037                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3038                         bond->params.xmit_policy);
3039         }
3040
3041         if (USES_PRIMARY(bond->params.mode)) {
3042                 seq_printf(seq, "Primary Slave: %s\n",
3043                            (bond->primary_slave) ?
3044                            bond->primary_slave->dev->name : "None");
3045
3046                 seq_printf(seq, "Currently Active Slave: %s\n",
3047                            (curr) ? curr->dev->name : "None");
3048         }
3049
3050         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3051                    "up" : "down");
3052         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3053         seq_printf(seq, "Up Delay (ms): %d\n",
3054                    bond->params.updelay * bond->params.miimon);
3055         seq_printf(seq, "Down Delay (ms): %d\n",
3056                    bond->params.downdelay * bond->params.miimon);
3057
3058
3059         /* ARP information */
3060         if(bond->params.arp_interval > 0) {
3061                 int printed=0;
3062                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3063                                 bond->params.arp_interval);
3064
3065                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3066
3067                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3068                         if (!bond->params.arp_targets[i])
3069                                 continue;
3070                         if (printed)
3071                                 seq_printf(seq, ",");
3072                         target = ntohl(bond->params.arp_targets[i]);
3073                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
3074                         printed = 1;
3075                 }
3076                 seq_printf(seq, "\n");
3077         }
3078
3079         if (bond->params.mode == BOND_MODE_8023AD) {
3080                 struct ad_info ad_info;
3081                 DECLARE_MAC_BUF(mac);
3082
3083                 seq_puts(seq, "\n802.3ad info\n");
3084                 seq_printf(seq, "LACP rate: %s\n",
3085                            (bond->params.lacp_fast) ? "fast" : "slow");
3086
3087                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3088                         seq_printf(seq, "bond %s has no active aggregator\n",
3089                                    bond->dev->name);
3090                 } else {
3091                         seq_printf(seq, "Active Aggregator Info:\n");
3092
3093                         seq_printf(seq, "\tAggregator ID: %d\n",
3094                                    ad_info.aggregator_id);
3095                         seq_printf(seq, "\tNumber of ports: %d\n",
3096                                    ad_info.ports);
3097                         seq_printf(seq, "\tActor Key: %d\n",
3098                                    ad_info.actor_key);
3099                         seq_printf(seq, "\tPartner Key: %d\n",
3100                                    ad_info.partner_key);
3101                         seq_printf(seq, "\tPartner Mac Address: %s\n",
3102                                    print_mac(mac, ad_info.partner_system));
3103                 }
3104         }
3105 }
3106
3107 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3108 {
3109         struct bonding *bond = seq->private;
3110         DECLARE_MAC_BUF(mac);
3111
3112         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3113         seq_printf(seq, "MII Status: %s\n",
3114                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3115         seq_printf(seq, "Link Failure Count: %u\n",
3116                    slave->link_failure_count);
3117
3118         seq_printf(seq,
3119                    "Permanent HW addr: %s\n",
3120                    print_mac(mac, slave->perm_hwaddr));
3121
3122         if (bond->params.mode == BOND_MODE_8023AD) {
3123                 const struct aggregator *agg
3124                         = SLAVE_AD_INFO(slave).port.aggregator;
3125
3126                 if (agg) {
3127                         seq_printf(seq, "Aggregator ID: %d\n",
3128                                    agg->aggregator_identifier);
3129                 } else {
3130                         seq_puts(seq, "Aggregator ID: N/A\n");
3131                 }
3132         }
3133 }
3134
3135 static int bond_info_seq_show(struct seq_file *seq, void *v)
3136 {
3137         if (v == SEQ_START_TOKEN) {
3138                 seq_printf(seq, "%s\n", version);
3139                 bond_info_show_master(seq);
3140         } else {
3141                 bond_info_show_slave(seq, v);
3142         }
3143
3144         return 0;
3145 }
3146
3147 static struct seq_operations bond_info_seq_ops = {
3148         .start = bond_info_seq_start,
3149         .next  = bond_info_seq_next,
3150         .stop  = bond_info_seq_stop,
3151         .show  = bond_info_seq_show,
3152 };
3153
3154 static int bond_info_open(struct inode *inode, struct file *file)
3155 {
3156         struct seq_file *seq;
3157         struct proc_dir_entry *proc;
3158         int res;
3159
3160         res = seq_open(file, &bond_info_seq_ops);
3161         if (!res) {
3162                 /* recover the pointer buried in proc_dir_entry data */
3163                 seq = file->private_data;
3164                 proc = PDE(inode);
3165                 seq->private = proc->data;
3166         }
3167
3168         return res;
3169 }
3170
3171 static const struct file_operations bond_info_fops = {
3172         .owner   = THIS_MODULE,
3173         .open    = bond_info_open,
3174         .read    = seq_read,
3175         .llseek  = seq_lseek,
3176         .release = seq_release,
3177 };
3178
3179 static int bond_create_proc_entry(struct bonding *bond)
3180 {
3181         struct net_device *bond_dev = bond->dev;
3182
3183         if (bond_proc_dir) {
3184                 bond->proc_entry = create_proc_entry(bond_dev->name,
3185                                                      S_IRUGO,
3186                                                      bond_proc_dir);
3187                 if (bond->proc_entry == NULL) {
3188                         printk(KERN_WARNING DRV_NAME
3189                                ": Warning: Cannot create /proc/net/%s/%s\n",
3190                                DRV_NAME, bond_dev->name);
3191                 } else {
3192                         bond->proc_entry->data = bond;
3193                         bond->proc_entry->proc_fops = &bond_info_fops;
3194                         bond->proc_entry->owner = THIS_MODULE;
3195                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3196                 }
3197         }
3198
3199         return 0;
3200 }
3201
3202 static void bond_remove_proc_entry(struct bonding *bond)
3203 {
3204         if (bond_proc_dir && bond->proc_entry) {
3205                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3206                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3207                 bond->proc_entry = NULL;
3208         }
3209 }
3210
3211 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3212  * Caller must hold rtnl_lock.
3213  */
3214 static void bond_create_proc_dir(void)
3215 {
3216         int len = strlen(DRV_NAME);
3217
3218         for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
3219              bond_proc_dir = bond_proc_dir->next) {
3220                 if ((bond_proc_dir->namelen == len) &&
3221                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3222                         break;
3223                 }
3224         }
3225
3226         if (!bond_proc_dir) {
3227                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3228                 if (bond_proc_dir) {
3229                         bond_proc_dir->owner = THIS_MODULE;
3230                 } else {
3231                         printk(KERN_WARNING DRV_NAME
3232                                 ": Warning: cannot create /proc/net/%s\n",
3233                                 DRV_NAME);
3234                 }
3235         }
3236 }
3237
3238 /* Destroy the bonding directory under /proc/net, if empty.
3239  * Caller must hold rtnl_lock.
3240  */
3241 static void bond_destroy_proc_dir(void)
3242 {
3243         struct proc_dir_entry *de;
3244
3245         if (!bond_proc_dir) {
3246                 return;
3247         }
3248
3249         /* verify that the /proc dir is empty */
3250         for (de = bond_proc_dir->subdir; de; de = de->next) {
3251                 /* ignore . and .. */
3252                 if (*(de->name) != '.') {
3253                         break;
3254                 }
3255         }
3256
3257         if (de) {
3258                 if (bond_proc_dir->owner == THIS_MODULE) {
3259                         bond_proc_dir->owner = NULL;
3260                 }
3261         } else {
3262                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3263                 bond_proc_dir = NULL;
3264         }
3265 }
3266 #endif /* CONFIG_PROC_FS */
3267
3268 /*-------------------------- netdev event handling --------------------------*/
3269
3270 /*
3271  * Change device name
3272  */
3273 static int bond_event_changename(struct bonding *bond)
3274 {
3275 #ifdef CONFIG_PROC_FS
3276         bond_remove_proc_entry(bond);
3277         bond_create_proc_entry(bond);
3278 #endif
3279         down_write(&(bonding_rwsem));
3280         bond_destroy_sysfs_entry(bond);
3281         bond_create_sysfs_entry(bond);
3282         up_write(&(bonding_rwsem));
3283         return NOTIFY_DONE;
3284 }
3285
3286 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3287 {
3288         struct bonding *event_bond = bond_dev->priv;
3289
3290         switch (event) {
3291         case NETDEV_CHANGENAME:
3292                 return bond_event_changename(event_bond);
3293         case NETDEV_UNREGISTER:
3294                 /*
3295                  * TODO: remove a bond from the list?
3296                  */
3297                 break;
3298         default:
3299                 break;
3300         }
3301
3302         return NOTIFY_DONE;
3303 }
3304
3305 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3306 {
3307         struct net_device *bond_dev = slave_dev->master;
3308         struct bonding *bond = bond_dev->priv;
3309
3310         switch (event) {
3311         case NETDEV_UNREGISTER:
3312                 if (bond_dev) {
3313                         bond_release(bond_dev, slave_dev);
3314                 }
3315                 break;
3316         case NETDEV_CHANGE:
3317                 /*
3318                  * TODO: is this what we get if somebody
3319                  * sets up a hierarchical bond, then rmmod's
3320                  * one of the slave bonding devices?
3321                  */
3322                 break;
3323         case NETDEV_DOWN:
3324                 /*
3325                  * ... Or is it this?
3326                  */
3327                 break;
3328         case NETDEV_CHANGEMTU:
3329                 /*
3330                  * TODO: Should slaves be allowed to
3331                  * independently alter their MTU?  For
3332                  * an active-backup bond, slaves need
3333                  * not be the same type of device, so
3334                  * MTUs may vary.  For other modes,
3335                  * slaves arguably should have the
3336                  * same MTUs. To do this, we'd need to
3337                  * take over the slave's change_mtu
3338                  * function for the duration of their
3339                  * servitude.
3340                  */
3341                 break;
3342         case NETDEV_CHANGENAME:
3343                 /*
3344                  * TODO: handle changing the primary's name
3345                  */
3346                 break;
3347         case NETDEV_FEAT_CHANGE:
3348                 bond_compute_features(bond);
3349                 break;
3350         default:
3351                 break;
3352         }
3353
3354         return NOTIFY_DONE;
3355 }
3356
3357 /*
3358  * bond_netdev_event: handle netdev notifier chain events.
3359  *
3360  * This function receives events for the netdev chain.  The caller (an
3361  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3362  * locks for us to safely manipulate the slave devices (RTNL lock,
3363  * dev_probe_lock).
3364  */
3365 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3366 {
3367         struct net_device *event_dev = (struct net_device *)ptr;
3368
3369         if (event_dev->nd_net != &init_net)
3370                 return NOTIFY_DONE;
3371
3372         dprintk("event_dev: %s, event: %lx\n",
3373                 (event_dev ? event_dev->name : "None"),
3374                 event);
3375
3376         if (!(event_dev->priv_flags & IFF_BONDING))
3377                 return NOTIFY_DONE;
3378
3379         if (event_dev->flags & IFF_MASTER) {
3380                 dprintk("IFF_MASTER\n");
3381                 return bond_master_netdev_event(event, event_dev);
3382         }
3383
3384         if (event_dev->flags & IFF_SLAVE) {
3385                 dprintk("IFF_SLAVE\n");
3386                 return bond_slave_netdev_event(event, event_dev);
3387         }
3388
3389         return NOTIFY_DONE;
3390 }
3391
3392 /*
3393  * bond_inetaddr_event: handle inetaddr notifier chain events.
3394  *
3395  * We keep track of device IPs primarily to use as source addresses in
3396  * ARP monitor probes (rather than spewing out broadcasts all the time).
3397  *
3398  * We track one IP for the main device (if it has one), plus one per VLAN.
3399  */
3400 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3401 {
3402         struct in_ifaddr *ifa = ptr;
3403         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3404         struct bonding *bond, *bond_next;
3405         struct vlan_entry *vlan, *vlan_next;
3406
3407         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3408                 if (bond->dev == event_dev) {
3409                         switch (event) {
3410                         case NETDEV_UP:
3411                                 bond->master_ip = ifa->ifa_local;
3412                                 return NOTIFY_OK;
3413                         case NETDEV_DOWN:
3414                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3415                                 return NOTIFY_OK;
3416                         default:
3417                                 return NOTIFY_DONE;
3418                         }
3419                 }
3420
3421                 if (list_empty(&bond->vlan_list))
3422                         continue;
3423
3424                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3425                                          vlan_list) {
3426                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3427                         if (vlan_dev == event_dev) {
3428                                 switch (event) {
3429                                 case NETDEV_UP:
3430                                         vlan->vlan_ip = ifa->ifa_local;
3431                                         return NOTIFY_OK;
3432                                 case NETDEV_DOWN:
3433                                         vlan->vlan_ip =
3434                                                 bond_glean_dev_ip(vlan_dev);
3435                                         return NOTIFY_OK;
3436                                 default:
3437                                         return NOTIFY_DONE;
3438                                 }
3439                         }
3440                 }
3441         }
3442         return NOTIFY_DONE;
3443 }
3444
3445 static struct notifier_block bond_netdev_notifier = {
3446         .notifier_call = bond_netdev_event,
3447 };
3448
3449 static struct notifier_block bond_inetaddr_notifier = {
3450         .notifier_call = bond_inetaddr_event,
3451 };
3452
3453 /*-------------------------- Packet type handling ---------------------------*/
3454
3455 /* register to receive lacpdus on a bond */
3456 static void bond_register_lacpdu(struct bonding *bond)
3457 {
3458         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3459
3460         /* initialize packet type */
3461         pk_type->type = PKT_TYPE_LACPDU;
3462         pk_type->dev = bond->dev;
3463         pk_type->func = bond_3ad_lacpdu_recv;
3464
3465         dev_add_pack(pk_type);
3466 }
3467
3468 /* unregister to receive lacpdus on a bond */
3469 static void bond_unregister_lacpdu(struct bonding *bond)
3470 {
3471         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3472 }
3473
3474 void bond_register_arp(struct bonding *bond)
3475 {
3476         struct packet_type *pt = &bond->arp_mon_pt;
3477
3478         if (pt->type)
3479                 return;
3480
3481         pt->type = htons(ETH_P_ARP);
3482         pt->dev = bond->dev;
3483         pt->func = bond_arp_rcv;
3484         dev_add_pack(pt);
3485 }
3486
3487 void bond_unregister_arp(struct bonding *bond)
3488 {
3489         struct packet_type *pt = &bond->arp_mon_pt;
3490
3491         dev_remove_pack(pt);
3492         pt->type = 0;
3493 }
3494
3495 /*---------------------------- Hashing Policies -----------------------------*/
3496
3497 /*
3498  * Hash for the output device based upon layer 3 and layer 4 data. If
3499  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3500  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3501  */
3502 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3503                                     struct net_device *bond_dev, int count)
3504 {
3505         struct ethhdr *data = (struct ethhdr *)skb->data;
3506         struct iphdr *iph = ip_hdr(skb);
3507         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3508         int layer4_xor = 0;
3509
3510         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3511                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3512                     (iph->protocol == IPPROTO_TCP ||
3513                      iph->protocol == IPPROTO_UDP)) {
3514                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3515                 }
3516                 return (layer4_xor ^
3517                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3518
3519         }
3520
3521         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3522 }
3523
3524 /*
3525  * Hash for the output device based upon layer 2 data
3526  */
3527 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3528                                    struct net_device *bond_dev, int count)
3529 {
3530         struct ethhdr *data = (struct ethhdr *)skb->data;
3531
3532         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3533 }
3534
3535 /*-------------------------- Device entry points ----------------------------*/
3536
3537 static int bond_open(struct net_device *bond_dev)
3538 {
3539         struct bonding *bond = bond_dev->priv;
3540         struct timer_list *mii_timer = &bond->mii_timer;
3541         struct timer_list *arp_timer = &bond->arp_timer;
3542
3543         bond->kill_timers = 0;
3544
3545         if ((bond->params.mode == BOND_MODE_TLB) ||
3546             (bond->params.mode == BOND_MODE_ALB)) {
3547                 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3548
3549                 /* bond_alb_initialize must be called before the timer
3550                  * is started.
3551                  */
3552                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3553                         /* something went wrong - fail the open operation */
3554                         return -1;
3555                 }
3556
3557                 init_timer(alb_timer);
3558                 alb_timer->expires  = jiffies + 1;
3559                 alb_timer->data     = (unsigned long)bond;
3560                 alb_timer->function = (void *)&bond_alb_monitor;
3561                 add_timer(alb_timer);
3562         }
3563
3564         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3565                 init_timer(mii_timer);
3566                 mii_timer->expires  = jiffies + 1;
3567                 mii_timer->data     = (unsigned long)bond_dev;
3568                 mii_timer->function = (void *)&bond_mii_monitor;
3569                 add_timer(mii_timer);
3570         }
3571
3572         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3573                 init_timer(arp_timer);
3574                 arp_timer->expires  = jiffies + 1;
3575                 arp_timer->data     = (unsigned long)bond_dev;
3576                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3577                         arp_timer->function = (void *)&bond_activebackup_arp_mon;
3578                 } else {
3579                         arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3580                 }
3581                 if (bond->params.arp_validate)
3582                         bond_register_arp(bond);
3583
3584                 add_timer(arp_timer);
3585         }
3586
3587         if (bond->params.mode == BOND_MODE_8023AD) {
3588                 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3589                 init_timer(ad_timer);
3590                 ad_timer->expires  = jiffies + 1;
3591                 ad_timer->data     = (unsigned long)bond;
3592                 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3593                 add_timer(ad_timer);
3594
3595                 /* register to receive LACPDUs */
3596                 bond_register_lacpdu(bond);
3597         }
3598
3599         return 0;
3600 }
3601
3602 static int bond_close(struct net_device *bond_dev)
3603 {
3604         struct bonding *bond = bond_dev->priv;
3605
3606         if (bond->params.mode == BOND_MODE_8023AD) {
3607                 /* Unregister the receive of LACPDUs */
3608                 bond_unregister_lacpdu(bond);
3609         }
3610
3611         if (bond->params.arp_validate)
3612                 bond_unregister_arp(bond);
3613
3614         write_lock_bh(&bond->lock);
3615
3616
3617         /* signal timers not to re-arm */
3618         bond->kill_timers = 1;
3619
3620         write_unlock_bh(&bond->lock);
3621
3622         /* del_timer_sync must run without holding the bond->lock
3623          * because a running timer might be trying to hold it too
3624          */
3625
3626         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3627                 del_timer_sync(&bond->mii_timer);
3628         }
3629
3630         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3631                 del_timer_sync(&bond->arp_timer);
3632         }
3633
3634         switch (bond->params.mode) {
3635         case BOND_MODE_8023AD:
3636                 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3637                 break;
3638         case BOND_MODE_TLB:
3639         case BOND_MODE_ALB:
3640                 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3641                 break;
3642         default:
3643                 break;
3644         }
3645
3646
3647         if ((bond->params.mode == BOND_MODE_TLB) ||
3648             (bond->params.mode == BOND_MODE_ALB)) {
3649                 /* Must be called only after all
3650                  * slaves have been released
3651                  */
3652                 bond_alb_deinitialize(bond);
3653         }
3654
3655         return 0;
3656 }
3657
3658 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3659 {
3660         struct bonding *bond = bond_dev->priv;
3661         struct net_device_stats *stats = &(bond->stats), *sstats;
3662         struct slave *slave;
3663         int i;
3664
3665         memset(stats, 0, sizeof(struct net_device_stats));
3666
3667         read_lock_bh(&bond->lock);
3668
3669         bond_for_each_slave(bond, slave, i) {
3670                 sstats = slave->dev->get_stats(slave->dev);
3671                 stats->rx_packets += sstats->rx_packets;
3672                 stats->rx_bytes += sstats->rx_bytes;
3673                 stats->rx_errors += sstats->rx_errors;
3674                 stats->rx_dropped += sstats->rx_dropped;
3675
3676                 stats->tx_packets += sstats->tx_packets;
3677                 stats->tx_bytes += sstats->tx_bytes;
3678                 stats->tx_errors += sstats->tx_errors;
3679                 stats->tx_dropped += sstats->tx_dropped;
3680
3681                 stats->multicast += sstats->multicast;
3682                 stats->collisions += sstats->collisions;
3683
3684                 stats->rx_length_errors += sstats->rx_length_errors;
3685                 stats->rx_over_errors += sstats->rx_over_errors;
3686                 stats->rx_crc_errors += sstats->rx_crc_errors;
3687                 stats->rx_frame_errors += sstats->rx_frame_errors;
3688                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3689                 stats->rx_missed_errors += sstats->rx_missed_errors;
3690
3691                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3692                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3693                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3694                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3695                 stats->tx_window_errors += sstats->tx_window_errors;
3696         }
3697
3698         read_unlock_bh(&bond->lock);
3699
3700         return stats;
3701 }
3702
3703 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3704 {
3705         struct net_device *slave_dev = NULL;
3706         struct ifbond k_binfo;
3707         struct ifbond __user *u_binfo = NULL;
3708         struct ifslave k_sinfo;
3709         struct ifslave __user *u_sinfo = NULL;
3710         struct mii_ioctl_data *mii = NULL;
3711         int res = 0;
3712
3713         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3714                 bond_dev->name, cmd);
3715
3716         switch (cmd) {
3717         case SIOCGMIIPHY:
3718                 mii = if_mii(ifr);
3719                 if (!mii) {
3720                         return -EINVAL;
3721                 }
3722                 mii->phy_id = 0;
3723                 /* Fall Through */
3724         case SIOCGMIIREG:
3725                 /*
3726                  * We do this again just in case we were called by SIOCGMIIREG
3727                  * instead of SIOCGMIIPHY.
3728                  */
3729                 mii = if_mii(ifr);
3730                 if (!mii) {
3731                         return -EINVAL;
3732                 }
3733
3734                 if (mii->reg_num == 1) {
3735                         struct bonding *bond = bond_dev->priv;
3736                         mii->val_out = 0;
3737                         read_lock_bh(&bond->lock);
3738                         read_lock(&bond->curr_slave_lock);
3739                         if (netif_carrier_ok(bond->dev)) {
3740                                 mii->val_out = BMSR_LSTATUS;
3741                         }
3742                         read_unlock(&bond->curr_slave_lock);
3743                         read_unlock_bh(&bond->lock);
3744                 }
3745
3746                 return 0;
3747         case BOND_INFO_QUERY_OLD:
3748         case SIOCBONDINFOQUERY:
3749                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3750
3751                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3752                         return -EFAULT;
3753                 }
3754
3755                 res = bond_info_query(bond_dev, &k_binfo);
3756                 if (res == 0) {
3757                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3758                                 return -EFAULT;
3759                         }
3760                 }
3761
3762                 return res;
3763         case BOND_SLAVE_INFO_QUERY_OLD:
3764         case SIOCBONDSLAVEINFOQUERY:
3765                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3766
3767                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3768                         return -EFAULT;
3769                 }
3770
3771                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3772                 if (res == 0) {
3773                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3774                                 return -EFAULT;
3775                         }
3776                 }
3777
3778                 return res;
3779         default:
3780                 /* Go on */
3781                 break;
3782         }
3783
3784         if (!capable(CAP_NET_ADMIN)) {
3785                 return -EPERM;
3786         }
3787
3788         down_write(&(bonding_rwsem));
3789         slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
3790
3791         dprintk("slave_dev=%p: \n", slave_dev);
3792
3793         if (!slave_dev) {
3794                 res = -ENODEV;
3795         } else {
3796                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3797                 switch (cmd) {
3798                 case BOND_ENSLAVE_OLD:
3799                 case SIOCBONDENSLAVE:
3800                         res = bond_enslave(bond_dev, slave_dev);
3801                         break;
3802                 case BOND_RELEASE_OLD:
3803                 case SIOCBONDRELEASE:
3804                         res = bond_release(bond_dev, slave_dev);
3805                         break;
3806                 case BOND_SETHWADDR_OLD:
3807                 case SIOCBONDSETHWADDR:
3808                         res = bond_sethwaddr(bond_dev, slave_dev);
3809                         break;
3810                 case BOND_CHANGE_ACTIVE_OLD:
3811                 case SIOCBONDCHANGEACTIVE:
3812                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3813                         break;
3814                 default:
3815                         res = -EOPNOTSUPP;
3816                 }
3817
3818                 dev_put(slave_dev);
3819         }
3820
3821         up_write(&(bonding_rwsem));
3822         return res;
3823 }
3824
3825 static void bond_set_multicast_list(struct net_device *bond_dev)
3826 {
3827         struct bonding *bond = bond_dev->priv;
3828         struct dev_mc_list *dmi;
3829
3830         write_lock_bh(&bond->lock);
3831
3832         /*
3833          * Do promisc before checking multicast_mode
3834          */
3835         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3836                 bond_set_promiscuity(bond, 1);
3837         }
3838
3839         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3840                 bond_set_promiscuity(bond, -1);
3841         }
3842
3843         /* set allmulti flag to slaves */
3844         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3845                 bond_set_allmulti(bond, 1);
3846         }
3847
3848         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3849                 bond_set_allmulti(bond, -1);
3850         }
3851
3852         bond->flags = bond_dev->flags;
3853
3854         /* looking for addresses to add to slaves' mc list */
3855         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3856                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3857                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3858                 }
3859         }
3860
3861         /* looking for addresses to delete from slaves' list */
3862         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3863                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3864                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3865                 }
3866         }
3867
3868         /* save master's multicast list */
3869         bond_mc_list_destroy(bond);
3870         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3871
3872         write_unlock_bh(&bond->lock);
3873 }
3874
3875 /*
3876  * Change the MTU of all of a master's slaves to match the master
3877  */
3878 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3879 {
3880         struct bonding *bond = bond_dev->priv;
3881         struct slave *slave, *stop_at;
3882         int res = 0;
3883         int i;
3884
3885         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3886                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3887
3888         /* Can't hold bond->lock with bh disabled here since
3889          * some base drivers panic. On the other hand we can't
3890          * hold bond->lock without bh disabled because we'll
3891          * deadlock. The only solution is to rely on the fact
3892          * that we're under rtnl_lock here, and the slaves
3893          * list won't change. This doesn't solve the problem
3894          * of setting the slave's MTU while it is
3895          * transmitting, but the assumption is that the base
3896          * driver can handle that.
3897          *
3898          * TODO: figure out a way to safely iterate the slaves
3899          * list, but without holding a lock around the actual
3900          * call to the base driver.
3901          */
3902
3903         bond_for_each_slave(bond, slave, i) {
3904                 dprintk("s %p s->p %p c_m %p\n", slave,
3905                         slave->prev, slave->dev->change_mtu);
3906
3907                 res = dev_set_mtu(slave->dev, new_mtu);
3908
3909                 if (res) {
3910                         /* If we failed to set the slave's mtu to the new value
3911                          * we must abort the operation even in ACTIVE_BACKUP
3912                          * mode, because if we allow the backup slaves to have
3913                          * different mtu values than the active slave we'll
3914                          * need to change their mtu when doing a failover. That
3915                          * means changing their mtu from timer context, which
3916                          * is probably not a good idea.
3917                          */
3918                         dprintk("err %d %s\n", res, slave->dev->name);
3919                         goto unwind;
3920                 }
3921         }
3922
3923         bond_dev->mtu = new_mtu;
3924
3925         return 0;
3926
3927 unwind:
3928         /* unwind from head to the slave that failed */
3929         stop_at = slave;
3930         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3931                 int tmp_res;
3932
3933                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3934                 if (tmp_res) {
3935                         dprintk("unwind err %d dev %s\n", tmp_res,
3936                                 slave->dev->name);
3937                 }
3938         }
3939
3940         return res;
3941 }
3942
3943 /*
3944  * Change HW address
3945  *
3946  * Note that many devices must be down to change the HW address, and
3947  * downing the master releases all slaves.  We can make bonds full of
3948  * bonding devices to test this, however.
3949  */
3950 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3951 {
3952         struct bonding *bond = bond_dev->priv;
3953         struct sockaddr *sa = addr, tmp_sa;
3954         struct slave *slave, *stop_at;
3955         int res = 0;
3956         int i;
3957
3958         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3959
3960         if (!bond->do_set_mac_addr)
3961                 return -EOPNOTSUPP;
3962
3963         if (!is_valid_ether_addr(sa->sa_data)) {
3964                 return -EADDRNOTAVAIL;
3965         }
3966
3967         /* Can't hold bond->lock with bh disabled here since
3968          * some base drivers panic. On the other hand we can't
3969          * hold bond->lock without bh disabled because we'll
3970          * deadlock. The only solution is to rely on the fact
3971          * that we're under rtnl_lock here, and the slaves
3972          * list won't change. This doesn't solve the problem
3973          * of setting the slave's hw address while it is
3974          * transmitting, but the assumption is that the base
3975          * driver can handle that.
3976          *
3977          * TODO: figure out a way to safely iterate the slaves
3978          * list, but without holding a lock around the actual
3979          * call to the base driver.
3980          */
3981
3982         bond_for_each_slave(bond, slave, i) {
3983                 dprintk("slave %p %s\n", slave, slave->dev->name);
3984
3985                 if (slave->dev->set_mac_address == NULL) {
3986                         res = -EOPNOTSUPP;
3987                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3988                         goto unwind;
3989                 }
3990
3991                 res = dev_set_mac_address(slave->dev, addr);
3992                 if (res) {
3993                         /* TODO: consider downing the slave
3994                          * and retry ?
3995                          * User should expect communications
3996                          * breakage anyway until ARP finish
3997                          * updating, so...
3998                          */
3999                         dprintk("err %d %s\n", res, slave->dev->name);
4000                         goto unwind;
4001                 }
4002         }
4003
4004         /* success */
4005         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4006         return 0;
4007
4008 unwind:
4009         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4010         tmp_sa.sa_family = bond_dev->type;
4011
4012         /* unwind from head to the slave that failed */
4013         stop_at = slave;
4014         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4015                 int tmp_res;
4016
4017                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4018                 if (tmp_res) {
4019                         dprintk("unwind err %d dev %s\n", tmp_res,
4020                                 slave->dev->name);
4021                 }
4022         }
4023
4024         return res;
4025 }
4026
4027 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4028 {
4029         struct bonding *bond = bond_dev->priv;
4030         struct slave *slave, *start_at;
4031         int i;
4032         int res = 1;
4033
4034         read_lock(&bond->lock);
4035
4036         if (!BOND_IS_OK(bond)) {
4037                 goto out;
4038         }
4039
4040         read_lock(&bond->curr_slave_lock);
4041         slave = start_at = bond->curr_active_slave;
4042         read_unlock(&bond->curr_slave_lock);
4043
4044         if (!slave) {
4045                 goto out;
4046         }
4047
4048         bond_for_each_slave_from(bond, slave, i, start_at) {
4049                 if (IS_UP(slave->dev) &&
4050                     (slave->link == BOND_LINK_UP) &&
4051                     (slave->state == BOND_STATE_ACTIVE)) {
4052                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4053
4054                         write_lock(&bond->curr_slave_lock);
4055                         bond->curr_active_slave = slave->next;
4056                         write_unlock(&bond->curr_slave_lock);
4057
4058                         break;
4059                 }
4060         }
4061
4062
4063 out:
4064         if (res) {
4065                 /* no suitable interface, frame not sent */
4066                 dev_kfree_skb(skb);
4067         }
4068         read_unlock(&bond->lock);
4069         return 0;
4070 }
4071
4072
4073 /*
4074  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4075  * the bond has a usable interface.
4076  */
4077 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4078 {
4079         struct bonding *bond = bond_dev->priv;
4080         int res = 1;
4081
4082         read_lock(&bond->lock);
4083         read_lock(&bond->curr_slave_lock);
4084
4085         if (!BOND_IS_OK(bond)) {
4086                 goto out;
4087         }
4088
4089         if (!bond->curr_active_slave)
4090                 goto out;
4091
4092         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4093
4094 out:
4095         if (res) {
4096                 /* no suitable interface, frame not sent */
4097                 dev_kfree_skb(skb);
4098         }
4099         read_unlock(&bond->curr_slave_lock);
4100         read_unlock(&bond->lock);
4101         return 0;
4102 }
4103
4104 /*
4105  * In bond_xmit_xor() , we determine the output device by using a pre-
4106  * determined xmit_hash_policy(), If the selected device is not enabled,
4107  * find the next active slave.
4108  */
4109 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4110 {
4111         struct bonding *bond = bond_dev->priv;
4112         struct slave *slave, *start_at;
4113         int slave_no;
4114         int i;
4115         int res = 1;
4116
4117         read_lock(&bond->lock);
4118
4119         if (!BOND_IS_OK(bond)) {
4120                 goto out;
4121         }
4122
4123         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4124
4125         bond_for_each_slave(bond, slave, i) {
4126                 slave_no--;
4127                 if (slave_no < 0) {
4128                         break;
4129                 }
4130         }
4131
4132         start_at = slave;
4133
4134         bond_for_each_slave_from(bond, slave, i, start_at) {
4135                 if (IS_UP(slave->dev) &&
4136                     (slave->link == BOND_LINK_UP) &&
4137                     (slave->state == BOND_STATE_ACTIVE)) {
4138                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4139                         break;
4140                 }
4141         }
4142
4143 out:
4144         if (res) {
4145                 /* no suitable interface, frame not sent */
4146                 dev_kfree_skb(skb);
4147         }
4148         read_unlock(&bond->lock);
4149         return 0;
4150 }
4151
4152 /*
4153  * in broadcast mode, we send everything to all usable interfaces.
4154  */
4155 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4156 {
4157         struct bonding *bond = bond_dev->priv;
4158         struct slave *slave, *start_at;
4159         struct net_device *tx_dev = NULL;
4160         int i;
4161         int res = 1;
4162
4163         read_lock(&bond->lock);
4164
4165         if (!BOND_IS_OK(bond)) {
4166                 goto out;
4167         }
4168
4169         read_lock(&bond->curr_slave_lock);
4170         start_at = bond->curr_active_slave;
4171         read_unlock(&bond->curr_slave_lock);
4172
4173         if (!start_at) {
4174                 goto out;
4175         }
4176
4177         bond_for_each_slave_from(bond, slave, i, start_at) {
4178                 if (IS_UP(slave->dev) &&
4179                     (slave->link == BOND_LINK_UP) &&
4180                     (slave->state == BOND_STATE_ACTIVE)) {
4181                         if (tx_dev) {
4182                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4183                                 if (!skb2) {
4184                                         printk(KERN_ERR DRV_NAME
4185                                                ": %s: Error: bond_xmit_broadcast(): "
4186                                                "skb_clone() failed\n",
4187                                                bond_dev->name);
4188                                         continue;
4189                                 }
4190
4191                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4192                                 if (res) {
4193                                         dev_kfree_skb(skb2);
4194                                         continue;
4195                                 }
4196                         }
4197                         tx_dev = slave->dev;
4198                 }
4199         }
4200
4201         if (tx_dev) {
4202                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4203         }
4204
4205 out:
4206         if (res) {
4207                 /* no suitable interface, frame not sent */
4208                 dev_kfree_skb(skb);
4209         }
4210         /* frame sent to all suitable interfaces */
4211         read_unlock(&bond->lock);
4212         return 0;
4213 }
4214
4215 /*------------------------- Device initialization ---------------------------*/
4216
4217 /*
4218  * set bond mode specific net device operations
4219  */
4220 void bond_set_mode_ops(struct bonding *bond, int mode)
4221 {
4222         struct net_device *bond_dev = bond->dev;
4223
4224         switch (mode) {
4225         case BOND_MODE_ROUNDROBIN:
4226                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4227                 break;
4228         case BOND_MODE_ACTIVEBACKUP:
4229                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4230                 break;
4231         case BOND_MODE_XOR:
4232                 bond_dev->hard_start_xmit = bond_xmit_xor;
4233                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4234                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4235                 else
4236                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4237                 break;
4238         case BOND_MODE_BROADCAST:
4239                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4240                 break;
4241         case BOND_MODE_8023AD:
4242                 bond_set_master_3ad_flags(bond);
4243                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4244                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4245                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4246                 else
4247                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4248                 break;
4249         case BOND_MODE_ALB:
4250                 bond_set_master_alb_flags(bond);
4251                 /* FALLTHRU */
4252         case BOND_MODE_TLB:
4253                 bond_dev->hard_start_xmit = bond_alb_xmit;
4254                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4255                 break;
4256         default:
4257                 /* Should never happen, mode already checked */
4258                 printk(KERN_ERR DRV_NAME
4259                        ": %s: Error: Unknown bonding mode %d\n",
4260                        bond_dev->name,
4261                        mode);
4262                 break;
4263         }
4264 }
4265
4266 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4267                                     struct ethtool_drvinfo *drvinfo)
4268 {
4269         strncpy(drvinfo->driver, DRV_NAME, 32);
4270         strncpy(drvinfo->version, DRV_VERSION, 32);
4271         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4272 }
4273
4274 static const struct ethtool_ops bond_ethtool_ops = {
4275         .get_drvinfo            = bond_ethtool_get_drvinfo,
4276 };
4277
4278 /*
4279  * Does not allocate but creates a /proc entry.
4280  * Allowed to fail.
4281  */
4282 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4283 {
4284         struct bonding *bond = bond_dev->priv;
4285
4286         dprintk("Begin bond_init for %s\n", bond_dev->name);
4287
4288         /* initialize rwlocks */
4289         rwlock_init(&bond->lock);
4290         rwlock_init(&bond->curr_slave_lock);
4291
4292         bond->params = *params; /* copy params struct */
4293
4294         /* Initialize pointers */
4295         bond->first_slave = NULL;
4296         bond->curr_active_slave = NULL;
4297         bond->current_arp_slave = NULL;
4298         bond->primary_slave = NULL;
4299         bond->dev = bond_dev;
4300         bond->send_grat_arp = 0;
4301         INIT_LIST_HEAD(&bond->vlan_list);
4302
4303         /* Initialize the device entry points */
4304         bond_dev->open = bond_open;
4305         bond_dev->stop = bond_close;
4306         bond_dev->get_stats = bond_get_stats;
4307         bond_dev->do_ioctl = bond_do_ioctl;
4308         bond_dev->ethtool_ops = &bond_ethtool_ops;
4309         bond_dev->set_multicast_list = bond_set_multicast_list;
4310         bond_dev->change_mtu = bond_change_mtu;
4311         bond_dev->set_mac_address = bond_set_mac_address;
4312
4313         bond_set_mode_ops(bond, bond->params.mode);
4314
4315         bond_dev->destructor = free_netdev;
4316
4317         /* Initialize the device options */
4318         bond_dev->tx_queue_len = 0;
4319         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4320         bond_dev->priv_flags |= IFF_BONDING;
4321
4322         /* At first, we block adding VLANs. That's the only way to
4323          * prevent problems that occur when adding VLANs over an
4324          * empty bond. The block will be removed once non-challenged
4325          * slaves are enslaved.
4326          */
4327         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4328
4329         /* don't acquire bond device's netif_tx_lock when
4330          * transmitting */
4331         bond_dev->features |= NETIF_F_LLTX;
4332
4333         /* By default, we declare the bond to be fully
4334          * VLAN hardware accelerated capable. Special
4335          * care is taken in the various xmit functions
4336          * when there are slaves that are not hw accel
4337          * capable
4338          */
4339         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4340         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4341         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4342         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4343                                NETIF_F_HW_VLAN_RX |
4344                                NETIF_F_HW_VLAN_FILTER);
4345
4346 #ifdef CONFIG_PROC_FS
4347         bond_create_proc_entry(bond);
4348 #endif
4349
4350         /* set do_set_mac_addr to true on startup */
4351         bond->do_set_mac_addr = 1;
4352
4353         list_add_tail(&bond->bond_list, &bond_dev_list);
4354
4355         return 0;
4356 }
4357
4358 /* De-initialize device specific data.
4359  * Caller must hold rtnl_lock.
4360  */
4361 void bond_deinit(struct net_device *bond_dev)
4362 {
4363         struct bonding *bond = bond_dev->priv;
4364
4365         list_del(&bond->bond_list);
4366
4367 #ifdef CONFIG_PROC_FS
4368         bond_remove_proc_entry(bond);
4369 #endif
4370 }
4371
4372 /* Unregister and free all bond devices.
4373  * Caller must hold rtnl_lock.
4374  */
4375 static void bond_free_all(void)
4376 {
4377         struct bonding *bond, *nxt;
4378
4379         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4380                 struct net_device *bond_dev = bond->dev;
4381
4382                 bond_mc_list_destroy(bond);
4383                 /* Release the bonded slaves */
4384                 bond_release_all(bond_dev);
4385                 bond_deinit(bond_dev);
4386                 unregister_netdevice(bond_dev);
4387         }
4388
4389 #ifdef CONFIG_PROC_FS
4390         bond_destroy_proc_dir();
4391 #endif
4392 }
4393
4394 /*------------------------- Module initialization ---------------------------*/
4395
4396 /*
4397  * Convert string input module parms.  Accept either the
4398  * number of the mode or its string name.
4399  */
4400 int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
4401 {
4402         int i;
4403
4404         for (i = 0; tbl[i].modename; i++) {
4405                 if ((isdigit(*mode_arg) &&
4406                      tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4407                     (strncmp(mode_arg, tbl[i].modename,
4408                              strlen(tbl[i].modename)) == 0)) {
4409                         return tbl[i].mode;
4410                 }
4411         }
4412
4413         return -1;
4414 }
4415
4416 static int bond_check_params(struct bond_params *params)
4417 {
4418         int arp_validate_value;
4419
4420         /*
4421          * Convert string parameters.
4422          */
4423         if (mode) {
4424                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4425                 if (bond_mode == -1) {
4426                         printk(KERN_ERR DRV_NAME
4427                                ": Error: Invalid bonding mode \"%s\"\n",
4428                                mode == NULL ? "NULL" : mode);
4429                         return -EINVAL;
4430                 }
4431         }
4432
4433         if (xmit_hash_policy) {
4434                 if ((bond_mode != BOND_MODE_XOR) &&
4435                     (bond_mode != BOND_MODE_8023AD)) {
4436                         printk(KERN_INFO DRV_NAME
4437                                ": xor_mode param is irrelevant in mode %s\n",
4438                                bond_mode_name(bond_mode));
4439                 } else {
4440                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4441                                                         xmit_hashtype_tbl);
4442                         if (xmit_hashtype == -1) {
4443                                 printk(KERN_ERR DRV_NAME
4444                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4445                                 xmit_hash_policy == NULL ? "NULL" :
4446                                        xmit_hash_policy);
4447                                 return -EINVAL;
4448                         }
4449                 }
4450         }
4451
4452         if (lacp_rate) {
4453                 if (bond_mode != BOND_MODE_8023AD) {
4454                         printk(KERN_INFO DRV_NAME
4455                                ": lacp_rate param is irrelevant in mode %s\n",
4456                                bond_mode_name(bond_mode));
4457                 } else {
4458                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4459                         if (lacp_fast == -1) {
4460                                 printk(KERN_ERR DRV_NAME
4461                                        ": Error: Invalid lacp rate \"%s\"\n",
4462                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4463                                 return -EINVAL;
4464                         }
4465                 }
4466         }
4467
4468         if (max_bonds < 1 || max_bonds > INT_MAX) {
4469                 printk(KERN_WARNING DRV_NAME
4470                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4471                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4472                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4473                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4474         }
4475
4476         if (miimon < 0) {
4477                 printk(KERN_WARNING DRV_NAME
4478                        ": Warning: miimon module parameter (%d), "
4479                        "not in range 0-%d, so it was reset to %d\n",
4480                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4481                 miimon = BOND_LINK_MON_INTERV;
4482         }
4483
4484         if (updelay < 0) {
4485                 printk(KERN_WARNING DRV_NAME
4486                        ": Warning: updelay module parameter (%d), "
4487                        "not in range 0-%d, so it was reset to 0\n",
4488                        updelay, INT_MAX);
4489                 updelay = 0;
4490         }
4491
4492         if (downdelay < 0) {
4493                 printk(KERN_WARNING DRV_NAME
4494                        ": Warning: downdelay module parameter (%d), "
4495                        "not in range 0-%d, so it was reset to 0\n",
4496                        downdelay, INT_MAX);
4497                 downdelay = 0;
4498         }
4499
4500         if ((use_carrier != 0) && (use_carrier != 1)) {
4501                 printk(KERN_WARNING DRV_NAME
4502                        ": Warning: use_carrier module parameter (%d), "
4503                        "not of valid value (0/1), so it was set to 1\n",
4504                        use_carrier);
4505                 use_carrier = 1;
4506         }
4507
4508         /* reset values for 802.3ad */
4509         if (bond_mode == BOND_MODE_8023AD) {
4510                 if (!miimon) {
4511                         printk(KERN_WARNING DRV_NAME
4512                                ": Warning: miimon must be specified, "
4513                                "otherwise bonding will not detect link "
4514                                "failure, speed and duplex which are "
4515                                "essential for 802.3ad operation\n");
4516                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4517                         miimon = 100;
4518                 }
4519         }
4520
4521         /* reset values for TLB/ALB */
4522         if ((bond_mode == BOND_MODE_TLB) ||
4523             (bond_mode == BOND_MODE_ALB)) {
4524                 if (!miimon) {
4525                         printk(KERN_WARNING DRV_NAME
4526                                ": Warning: miimon must be specified, "
4527                                "otherwise bonding will not detect link "
4528                                "failure and link speed which are essential "
4529                                "for TLB/ALB load balancing\n");
4530                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4531                         miimon = 100;
4532                 }
4533         }
4534
4535         if (bond_mode == BOND_MODE_ALB) {
4536                 printk(KERN_NOTICE DRV_NAME
4537                        ": In ALB mode you might experience client "
4538                        "disconnections upon reconnection of a link if the "
4539                        "bonding module updelay parameter (%d msec) is "
4540                        "incompatible with the forwarding delay time of the "
4541                        "switch\n",
4542                        updelay);
4543         }
4544
4545         if (!miimon) {
4546                 if (updelay || downdelay) {
4547                         /* just warn the user the up/down delay will have
4548                          * no effect since miimon is zero...
4549                          */
4550                         printk(KERN_WARNING DRV_NAME
4551                                ": Warning: miimon module parameter not set "
4552                                "and updelay (%d) or downdelay (%d) module "
4553                                "parameter is set; updelay and downdelay have "
4554                                "no effect unless miimon is set\n",
4555                                updelay, downdelay);
4556                 }
4557         } else {
4558                 /* don't allow arp monitoring */
4559                 if (arp_interval) {
4560                         printk(KERN_WARNING DRV_NAME
4561                                ": Warning: miimon (%d) and arp_interval (%d) "
4562                                "can't be used simultaneously, disabling ARP "
4563                                "monitoring\n",
4564                                miimon, arp_interval);
4565                         arp_interval = 0;
4566                 }
4567
4568                 if ((updelay % miimon) != 0) {
4569                         printk(KERN_WARNING DRV_NAME
4570                                ": Warning: updelay (%d) is not a multiple "
4571                                "of miimon (%d), updelay rounded to %d ms\n",
4572                                updelay, miimon, (updelay / miimon) * miimon);
4573                 }
4574
4575                 updelay /= miimon;
4576
4577                 if ((downdelay % miimon) != 0) {
4578                         printk(KERN_WARNING DRV_NAME
4579                                ": Warning: downdelay (%d) is not a multiple "
4580                                "of miimon (%d), downdelay rounded to %d ms\n",
4581                                downdelay, miimon,
4582                                (downdelay / miimon) * miimon);
4583                 }
4584
4585                 downdelay /= miimon;
4586         }
4587
4588         if (arp_interval < 0) {
4589                 printk(KERN_WARNING DRV_NAME
4590                        ": Warning: arp_interval module parameter (%d) "
4591                        ", not in range 0-%d, so it was reset to %d\n",
4592                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4593                 arp_interval = BOND_LINK_ARP_INTERV;
4594         }
4595
4596         for (arp_ip_count = 0;
4597              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4598              arp_ip_count++) {
4599                 /* not complete check, but should be good enough to
4600                    catch mistakes */
4601                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4602                         printk(KERN_WARNING DRV_NAME
4603                                ": Warning: bad arp_ip_target module parameter "
4604                                "(%s), ARP monitoring will not be performed\n",
4605                                arp_ip_target[arp_ip_count]);
4606                         arp_interval = 0;
4607                 } else {
4608                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4609                         arp_target[arp_ip_count] = ip;
4610                 }
4611         }
4612
4613         if (arp_interval && !arp_ip_count) {
4614                 /* don't allow arping if no arp_ip_target given... */
4615                 printk(KERN_WARNING DRV_NAME
4616                        ": Warning: arp_interval module parameter (%d) "
4617                        "specified without providing an arp_ip_target "
4618                        "parameter, arp_interval was reset to 0\n",
4619                        arp_interval);
4620                 arp_interval = 0;
4621         }
4622
4623         if (arp_validate) {
4624                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4625                         printk(KERN_ERR DRV_NAME
4626                ": arp_validate only supported in active-backup mode\n");
4627                         return -EINVAL;
4628                 }
4629                 if (!arp_interval) {
4630                         printk(KERN_ERR DRV_NAME
4631                                ": arp_validate requires arp_interval\n");
4632                         return -EINVAL;
4633                 }
4634
4635                 arp_validate_value = bond_parse_parm(arp_validate,
4636                                                      arp_validate_tbl);
4637                 if (arp_validate_value == -1) {
4638                         printk(KERN_ERR DRV_NAME
4639                                ": Error: invalid arp_validate \"%s\"\n",
4640                                arp_validate == NULL ? "NULL" : arp_validate);
4641                         return -EINVAL;
4642                 }
4643         } else
4644                 arp_validate_value = 0;
4645
4646         if (miimon) {
4647                 printk(KERN_INFO DRV_NAME
4648                        ": MII link monitoring set to %d ms\n",
4649                        miimon);
4650         } else if (arp_interval) {
4651                 int i;
4652
4653                 printk(KERN_INFO DRV_NAME
4654                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4655                        arp_interval,
4656                        arp_validate_tbl[arp_validate_value].modename,
4657                        arp_ip_count);
4658
4659                 for (i = 0; i < arp_ip_count; i++)
4660                         printk (" %s", arp_ip_target[i]);
4661
4662                 printk("\n");
4663
4664         } else {
4665                 /* miimon and arp_interval not set, we need one so things
4666                  * work as expected, see bonding.txt for details
4667                  */
4668                 printk(KERN_WARNING DRV_NAME
4669                        ": Warning: either miimon or arp_interval and "
4670                        "arp_ip_target module parameters must be specified, "
4671                        "otherwise bonding will not detect link failures! see "
4672                        "bonding.txt for details.\n");
4673         }
4674
4675         if (primary && !USES_PRIMARY(bond_mode)) {
4676                 /* currently, using a primary only makes sense
4677                  * in active backup, TLB or ALB modes
4678                  */
4679                 printk(KERN_WARNING DRV_NAME
4680                        ": Warning: %s primary device specified but has no "
4681                        "effect in %s mode\n",
4682                        primary, bond_mode_name(bond_mode));
4683                 primary = NULL;
4684         }
4685
4686         /* fill params struct with the proper values */
4687         params->mode = bond_mode;
4688         params->xmit_policy = xmit_hashtype;
4689         params->miimon = miimon;
4690         params->arp_interval = arp_interval;
4691         params->arp_validate = arp_validate_value;
4692         params->updelay = updelay;
4693         params->downdelay = downdelay;
4694         params->use_carrier = use_carrier;
4695         params->lacp_fast = lacp_fast;
4696         params->primary[0] = 0;
4697
4698         if (primary) {
4699                 strncpy(params->primary, primary, IFNAMSIZ);
4700                 params->primary[IFNAMSIZ - 1] = 0;
4701         }
4702
4703         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4704
4705         return 0;
4706 }
4707
4708 static struct lock_class_key bonding_netdev_xmit_lock_key;
4709
4710 /* Create a new bond based on the specified name and bonding parameters.
4711  * If name is NULL, obtain a suitable "bond%d" name for us.
4712  * Caller must NOT hold rtnl_lock; we need to release it here before we
4713  * set up our sysfs entries.
4714  */
4715 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4716 {
4717         struct net_device *bond_dev;
4718         int res;
4719
4720         rtnl_lock();
4721         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4722                                 ether_setup);
4723         if (!bond_dev) {
4724                 printk(KERN_ERR DRV_NAME
4725                        ": %s: eek! can't alloc netdev!\n",
4726                        name);
4727                 res = -ENOMEM;
4728                 goto out_rtnl;
4729         }
4730
4731         if (!name) {
4732                 res = dev_alloc_name(bond_dev, "bond%d");
4733                 if (res < 0)
4734                         goto out_netdev;
4735         }
4736
4737         /* bond_init() must be called after dev_alloc_name() (for the
4738          * /proc files), but before register_netdevice(), because we
4739          * need to set function pointers.
4740          */
4741
4742         res = bond_init(bond_dev, params);
4743         if (res < 0) {
4744                 goto out_netdev;
4745         }
4746
4747         res = register_netdevice(bond_dev);
4748         if (res < 0) {
4749                 goto out_bond;
4750         }
4751
4752         lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4753
4754         if (newbond)
4755                 *newbond = bond_dev->priv;
4756
4757         netif_carrier_off(bond_dev);
4758
4759         rtnl_unlock(); /* allows sysfs registration of net device */
4760         res = bond_create_sysfs_entry(bond_dev->priv);
4761         if (res < 0) {
4762                 rtnl_lock();
4763                 goto out_bond;
4764         }
4765
4766         return 0;
4767
4768 out_bond:
4769         bond_deinit(bond_dev);
4770 out_netdev:
4771         free_netdev(bond_dev);
4772 out_rtnl:
4773         rtnl_unlock();
4774         return res;
4775 }
4776
4777 static int __init bonding_init(void)
4778 {
4779         int i;
4780         int res;
4781
4782         printk(KERN_INFO "%s", version);
4783
4784         res = bond_check_params(&bonding_defaults);
4785         if (res) {
4786                 goto out;
4787         }
4788
4789 #ifdef CONFIG_PROC_FS
4790         bond_create_proc_dir();
4791 #endif
4792         for (i = 0; i < max_bonds; i++) {
4793                 res = bond_create(NULL, &bonding_defaults, NULL);
4794                 if (res)
4795                         goto err;
4796         }
4797
4798         res = bond_create_sysfs();
4799         if (res)
4800                 goto err;
4801
4802         register_netdevice_notifier(&bond_netdev_notifier);
4803         register_inetaddr_notifier(&bond_inetaddr_notifier);
4804
4805         goto out;
4806 err:
4807         rtnl_lock();
4808         bond_free_all();
4809         bond_destroy_sysfs();
4810         rtnl_unlock();
4811 out:
4812         return res;
4813
4814 }
4815
4816 static void __exit bonding_exit(void)
4817 {
4818         unregister_netdevice_notifier(&bond_netdev_notifier);
4819         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4820
4821         rtnl_lock();
4822         bond_free_all();
4823         bond_destroy_sysfs();
4824         rtnl_unlock();
4825 }
4826
4827 module_init(bonding_init);
4828 module_exit(bonding_exit);
4829 MODULE_LICENSE("GPL");
4830 MODULE_VERSION(DRV_VERSION);
4831 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4832 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4833 MODULE_SUPPORTED_DEVICE("most ethernet devices");
4834
4835 /*
4836  * Local variables:
4837  *  c-indent-level: 8
4838  *  c-basic-offset: 8
4839  *  tab-width: 8
4840  * End:
4841  */
4842