drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 //#define BONDING_DEBUG 1
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/sched.h>
  39 #include <linux/types.h>
  40 #include <linux/fcntl.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/ptrace.h>
  43 #include <linux/ioport.h>
  44 #include <linux/in.h>
  45 #include <net/ip.h>
  46 #include <linux/ip.h>
  47 #include <linux/tcp.h>
  48 #include <linux/udp.h>
  49 #include <linux/slab.h>
  50 #include <linux/string.h>
  51 #include <linux/init.h>
  52 #include <linux/timer.h>
  53 #include <linux/socket.h>
  54 #include <linux/ctype.h>
  55 #include <linux/inet.h>
  56 #include <linux/bitops.h>
  57 #include <asm/system.h>
  58 #include <asm/io.h>
  59 #include <asm/dma.h>
  60 #include <asm/uaccess.h>
  61 #include <linux/errno.h>
  62 #include <linux/netdevice.h>
  63 #include <linux/inetdevice.h>
  64 #include <linux/etherdevice.h>
  65 #include <linux/skbuff.h>
  66 #include <net/sock.h>
  67 #include <linux/rtnetlink.h>
  68 #include <linux/proc_fs.h>
  69 #include <linux/seq_file.h>
  70 #include <linux/smp.h>
  71 #include <linux/if_ether.h>
  72 #include <net/arp.h>
  73 #include <linux/mii.h>
  74 #include <linux/ethtool.h>
  75 #include <linux/if_vlan.h>
  76 #include <linux/if_bonding.h>
  77 #include <net/route.h>
  78 #include "bonding.h"
  79 #include "bond_3ad.h"
  80 #include "bond_alb.h"
  81
  82 /*---------------------------- Module parameters ----------------------------*/
  83
  84 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  85 #define BOND_LINK_MON_INTERV    0
  86 #define BOND_LINK_ARP_INTERV    0
  87
  88 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  89 static int miimon       = BOND_LINK_MON_INTERV;
  90 static int updelay      = 0;
  91 static int downdelay    = 0;
  92 static int use_carrier  = 1;
  93 static char *mode       = NULL;
  94 static char *primary    = NULL;
  95 static char *lacp_rate  = NULL;
  96 static char *xmit_hash_policy = NULL;
  97 static int arp_interval = BOND_LINK_ARP_INTERV;
  98 static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
  99 struct bond_params bonding_defaults;
 100
 101 module_param(max_bonds, int, 0);
 102 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 103 module_param(miimon, int, 0);
 104 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 105 module_param(updelay, int, 0);
 106 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 107 module_param(downdelay, int, 0);
 108 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 109                             "in milliseconds");
 110 module_param(use_carrier, int, 0);
 111 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 112                               "0 for off, 1 for on (default)");
 113 module_param(mode, charp, 0);
 114 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 115                        "1 for active-backup, 2 for balance-xor, "
 116                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 117                        "6 for balance-alb");
 118 module_param(primary, charp, 0);
 119 MODULE_PARM_DESC(primary, "Primary network device to use");
 120 module_param(lacp_rate, charp, 0);
 121 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 122                             "(slow/fast)");
 123 module_param(xmit_hash_policy, charp, 0);
 124 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 125                                    ", 1 for layer 3+4");
 126 module_param(arp_interval, int, 0);
 127 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 128 module_param_array(arp_ip_target, charp, NULL, 0);
 129 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 130
 131 /*----------------------------- Global variables ----------------------------*/
 132
 133 static const char * const version =
 134         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 135
 136 LIST_HEAD(bond_dev_list);
 137
 138 #ifdef CONFIG_PROC_FS
 139 static struct proc_dir_entry *bond_proc_dir = NULL;
 140 #endif
 141
 142 extern struct rw_semaphore bonding_rwsem;
 143 static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
 144 static int arp_ip_count = 0;
 145 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 146 static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
 147 static int lacp_fast    = 0;
 148
 149
 150 struct bond_parm_tbl bond_lacp_tbl[] = {
 151 {       "slow",         AD_LACP_SLOW},
 152 {       "fast",         AD_LACP_FAST},
 153 {       NULL,           -1},
 154 };
 155
 156 struct bond_parm_tbl bond_mode_tbl[] = {
 157 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 158 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 159 {       "balance-xor",          BOND_MODE_XOR},
 160 {       "broadcast",            BOND_MODE_BROADCAST},
 161 {       "802.3ad",              BOND_MODE_8023AD},
 162 {       "balance-tlb",          BOND_MODE_TLB},
 163 {       "balance-alb",          BOND_MODE_ALB},
 164 {       NULL,                   -1},
 165 };
 166
 167 struct bond_parm_tbl xmit_hashtype_tbl[] = {
 168 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 169 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 170 {       NULL,                   -1},
 171 };
 172
 173 /*-------------------------- Forward declarations ---------------------------*/
 174
 175 static void bond_send_gratuitous_arp(struct bonding *bond);
 176
 177 /*---------------------------- General routines -----------------------------*/
 178
 179 const char *bond_mode_name(int mode)
 180 {
 181         switch (mode) {
 182         case BOND_MODE_ROUNDROBIN :
 183                 return "load balancing (round-robin)";
 184         case BOND_MODE_ACTIVEBACKUP :
 185                 return "fault-tolerance (active-backup)";
 186         case BOND_MODE_XOR :
 187                 return "load balancing (xor)";
 188         case BOND_MODE_BROADCAST :
 189                 return "fault-tolerance (broadcast)";
 190         case BOND_MODE_8023AD:
 191                 return "IEEE 802.3ad Dynamic link aggregation";
 192         case BOND_MODE_TLB:
 193                 return "transmit load balancing";
 194         case BOND_MODE_ALB:
 195                 return "adaptive load balancing";
 196         default:
 197                 return "unknown";
 198         }
 199 }
 200
 201 /*---------------------------------- VLAN -----------------------------------*/
 202
 203 /**
 204  * bond_add_vlan - add a new vlan id on bond
 205  * @bond: bond that got the notification
 206  * @vlan_id: the vlan id to add
 207  *
 208  * Returns -ENOMEM if allocation failed.
 209  */
 210 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 211 {
 212         struct vlan_entry *vlan;
 213
 214         dprintk("bond: %s, vlan id %d\n",
 215                 (bond ? bond->dev->name: "None"), vlan_id);
 216
 217         vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 218         if (!vlan) {
 219                 return -ENOMEM;
 220         }
 221
 222         INIT_LIST_HEAD(&vlan->vlan_list);
 223         vlan->vlan_id = vlan_id;
 224         vlan->vlan_ip = 0;
 225
 226         write_lock_bh(&bond->lock);
 227
 228         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 229
 230         write_unlock_bh(&bond->lock);
 231
 232         dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 233
 234         return 0;
 235 }
 236
 237 /**
 238  * bond_del_vlan - delete a vlan id from bond
 239  * @bond: bond that got the notification
 240  * @vlan_id: the vlan id to delete
 241  *
 242  * returns -ENODEV if @vlan_id was not found in @bond.
 243  */
 244 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 245 {
 246         struct vlan_entry *vlan, *next;
 247         int res = -ENODEV;
 248
 249         dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 250
 251         write_lock_bh(&bond->lock);
 252
 253         list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
 254                 if (vlan->vlan_id == vlan_id) {
 255                         list_del(&vlan->vlan_list);
 256
 257                         if ((bond->params.mode == BOND_MODE_TLB) ||
 258                             (bond->params.mode == BOND_MODE_ALB)) {
 259                                 bond_alb_clear_vlan(bond, vlan_id);
 260                         }
 261
 262                         dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
 263                                 bond->dev->name);
 264
 265                         kfree(vlan);
 266
 267                         if (list_empty(&bond->vlan_list) &&
 268                             (bond->slave_cnt == 0)) {
 269                                 /* Last VLAN removed and no slaves, so
 270                                  * restore block on adding VLANs. This will
 271                                  * be removed once new slaves that are not
 272                                  * VLAN challenged will be added.
 273                                  */
 274                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 275                         }
 276
 277                         res = 0;
 278                         goto out;
 279                 }
 280         }
 281
 282         dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
 283                 bond->dev->name);
 284
 285 out:
 286         write_unlock_bh(&bond->lock);
 287         return res;
 288 }
 289
 290 /**
 291  * bond_has_challenged_slaves
 292  * @bond: the bond we're working on
 293  *
 294  * Searches the slave list. Returns 1 if a vlan challenged slave
 295  * was found, 0 otherwise.
 296  *
 297  * Assumes bond->lock is held.
 298  */
 299 static int bond_has_challenged_slaves(struct bonding *bond)
 300 {
 301         struct slave *slave;
 302         int i;
 303
 304         bond_for_each_slave(bond, slave, i) {
 305                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 306                         dprintk("found VLAN challenged slave - %s\n",
 307                                 slave->dev->name);
 308                         return 1;
 309                 }
 310         }
 311
 312         dprintk("no VLAN challenged slaves found\n");
 313         return 0;
 314 }
 315
 316 /**
 317  * bond_next_vlan - safely skip to the next item in the vlans list.
 318  * @bond: the bond we're working on
 319  * @curr: item we're advancing from
 320  *
 321  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 322  * or @curr->next otherwise (even if it is @curr itself again).
 323  *
 324  * Caller must hold bond->lock
 325  */
 326 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 327 {
 328         struct vlan_entry *next, *last;
 329
 330         if (list_empty(&bond->vlan_list)) {
 331                 return NULL;
 332         }
 333
 334         if (!curr) {
 335                 next = list_entry(bond->vlan_list.next,
 336                                   struct vlan_entry, vlan_list);
 337         } else {
 338                 last = list_entry(bond->vlan_list.prev,
 339                                   struct vlan_entry, vlan_list);
 340                 if (last == curr) {
 341                         next = list_entry(bond->vlan_list.next,
 342                                           struct vlan_entry, vlan_list);
 343                 } else {
 344                         next = list_entry(curr->vlan_list.next,
 345                                           struct vlan_entry, vlan_list);
 346                 }
 347         }
 348
 349         return next;
 350 }
 351
 352 /**
 353  * bond_dev_queue_xmit - Prepare skb for xmit.
 354  *
 355  * @bond: bond device that got this skb for tx.
 356  * @skb: hw accel VLAN tagged skb to transmit
 357  * @slave_dev: slave that is supposed to xmit this skbuff
 358  *
 359  * When the bond gets an skb to transmit that is
 360  * already hardware accelerated VLAN tagged, and it
 361  * needs to relay this skb to a slave that is not
 362  * hw accel capable, the skb needs to be "unaccelerated",
 363  * i.e. strip the hwaccel tag and re-insert it as part
 364  * of the payload.
 365  */
 366 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
 367 {
 368         unsigned short vlan_id;
 369
 370         if (!list_empty(&bond->vlan_list) &&
 371             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 372             vlan_get_tag(skb, &vlan_id) == 0) {
 373                 skb->dev = slave_dev;
 374                 skb = vlan_put_tag(skb, vlan_id);
 375                 if (!skb) {
 376                         /* vlan_put_tag() frees the skb in case of error,
 377                          * so return success here so the calling functions
 378                          * won't attempt to free is again.
 379                          */
 380                         return 0;
 381                 }
 382         } else {
 383                 skb->dev = slave_dev;
 384         }
 385
 386         skb->priority = 1;
 387         dev_queue_xmit(skb);
 388
 389         return 0;
 390 }
 391
 392 /*
 393  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 394  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 395  * lock because:
 396  * a. This operation is performed in IOCTL context,
 397  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 398  * c. Holding a lock with BH disabled while directly calling a base driver
 399  *    entry point is generally a BAD idea.
 400  *
 401  * The design of synchronization/protection for this operation in the 8021q
 402  * module is good for one or more VLAN devices over a single physical device
 403  * and cannot be extended for a teaming solution like bonding, so there is a
 404  * potential race condition here where a net device from the vlan group might
 405  * be referenced (either by a base driver or the 8021q code) while it is being
 406  * removed from the system. However, it turns out we're not making matters
 407  * worse, and if it works for regular VLAN usage it will work here too.
 408 */
 409
 410 /**
 411  * bond_vlan_rx_register - Propagates registration to slaves
 412  * @bond_dev: bonding net device that got called
 413  * @grp: vlan group being registered
 414  */
 415 static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
 416 {
 417         struct bonding *bond = bond_dev->priv;
 418         struct slave *slave;
 419         int i;
 420
 421         bond->vlgrp = grp;
 422
 423         bond_for_each_slave(bond, slave, i) {
 424                 struct net_device *slave_dev = slave->dev;
 425
 426                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 427                     slave_dev->vlan_rx_register) {
 428                         slave_dev->vlan_rx_register(slave_dev, grp);
 429                 }
 430         }
 431 }
 432
 433 /**
 434  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 435  * @bond_dev: bonding net device that got called
 436  * @vid: vlan id being added
 437  */
 438 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 439 {
 440         struct bonding *bond = bond_dev->priv;
 441         struct slave *slave;
 442         int i, res;
 443
 444         bond_for_each_slave(bond, slave, i) {
 445                 struct net_device *slave_dev = slave->dev;
 446
 447                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 448                     slave_dev->vlan_rx_add_vid) {
 449                         slave_dev->vlan_rx_add_vid(slave_dev, vid);
 450                 }
 451         }
 452
 453         res = bond_add_vlan(bond, vid);
 454         if (res) {
 455                 printk(KERN_ERR DRV_NAME
 456                        ": %s: Error: Failed to add vlan id %d\n",
 457                        bond_dev->name, vid);
 458         }
 459 }
 460
 461 /**
 462  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 463  * @bond_dev: bonding net device that got called
 464  * @vid: vlan id being removed
 465  */
 466 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 467 {
 468         struct bonding *bond = bond_dev->priv;
 469         struct slave *slave;
 470         struct net_device *vlan_dev;
 471         int i, res;
 472
 473         bond_for_each_slave(bond, slave, i) {
 474                 struct net_device *slave_dev = slave->dev;
 475
 476                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 477                     slave_dev->vlan_rx_kill_vid) {
 478                         /* Save and then restore vlan_dev in the grp array,
 479                          * since the slave's driver might clear it.
 480                          */
 481                         vlan_dev = bond->vlgrp->vlan_devices[vid];
 482                         slave_dev->vlan_rx_kill_vid(slave_dev, vid);
 483                         bond->vlgrp->vlan_devices[vid] = vlan_dev;
 484                 }
 485         }
 486
 487         res = bond_del_vlan(bond, vid);
 488         if (res) {
 489                 printk(KERN_ERR DRV_NAME
 490                        ": %s: Error: Failed to remove vlan id %d\n",
 491                        bond_dev->name, vid);
 492         }
 493 }
 494
 495 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 496 {
 497         struct vlan_entry *vlan;
 498
 499         write_lock_bh(&bond->lock);
 500
 501         if (list_empty(&bond->vlan_list)) {
 502                 goto out;
 503         }
 504
 505         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 506             slave_dev->vlan_rx_register) {
 507                 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
 508         }
 509
 510         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 511             !(slave_dev->vlan_rx_add_vid)) {
 512                 goto out;
 513         }
 514
 515         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 516                 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 517         }
 518
 519 out:
 520         write_unlock_bh(&bond->lock);
 521 }
 522
 523 static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
 524 {
 525         struct vlan_entry *vlan;
 526         struct net_device *vlan_dev;
 527
 528         write_lock_bh(&bond->lock);
 529
 530         if (list_empty(&bond->vlan_list)) {
 531                 goto out;
 532         }
 533
 534         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 535             !(slave_dev->vlan_rx_kill_vid)) {
 536                 goto unreg;
 537         }
 538
 539         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 540                 /* Save and then restore vlan_dev in the grp array,
 541                  * since the slave's driver might clear it.
 542                  */
 543                 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
 544                 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 545                 bond->vlgrp->vlan_devices[vlan->vlan_id] = vlan_dev;
 546         }
 547
 548 unreg:
 549         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 550             slave_dev->vlan_rx_register) {
 551                 slave_dev->vlan_rx_register(slave_dev, NULL);
 552         }
 553
 554 out:
 555         write_unlock_bh(&bond->lock);
 556 }
 557
 558 /*------------------------------- Link status -------------------------------*/
 559
 560 /*
 561  * Set the carrier state for the master according to the state of its
 562  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 563  * do special 802.3ad magic.
 564  *
 565  * Returns zero if carrier state does not change, nonzero if it does.
 566  */
 567 static int bond_set_carrier(struct bonding *bond)
 568 {
 569         struct slave *slave;
 570         int i;
 571
 572         if (bond->slave_cnt == 0)
 573                 goto down;
 574
 575         if (bond->params.mode == BOND_MODE_8023AD)
 576                 return bond_3ad_set_carrier(bond);
 577
 578         bond_for_each_slave(bond, slave, i) {
 579                 if (slave->link == BOND_LINK_UP) {
 580                         if (!netif_carrier_ok(bond->dev)) {
 581                                 netif_carrier_on(bond->dev);
 582                                 return 1;
 583                         }
 584                         return 0;
 585                 }
 586         }
 587
 588 down:
 589         if (netif_carrier_ok(bond->dev)) {
 590                 netif_carrier_off(bond->dev);
 591                 return 1;
 592         }
 593         return 0;
 594 }
 595
 596 /*
 597  * Get link speed and duplex from the slave's base driver
 598  * using ethtool. If for some reason the call fails or the
 599  * values are invalid, fake speed and duplex to 100/Full
 600  * and return error.
 601  */
 602 static int bond_update_speed_duplex(struct slave *slave)
 603 {
 604         struct net_device *slave_dev = slave->dev;
 605         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 606         struct ifreq ifr;
 607         struct ethtool_cmd etool;
 608
 609         /* Fake speed and duplex */
 610         slave->speed = SPEED_100;
 611         slave->duplex = DUPLEX_FULL;
 612
 613         if (slave_dev->ethtool_ops) {
 614                 int res;
 615
 616                 if (!slave_dev->ethtool_ops->get_settings) {
 617                         return -1;
 618                 }
 619
 620                 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 621                 if (res < 0) {
 622                         return -1;
 623                 }
 624
 625                 goto verify;
 626         }
 627
 628         ioctl = slave_dev->do_ioctl;
 629         strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 630         etool.cmd = ETHTOOL_GSET;
 631         ifr.ifr_data = (char*)&etool;
 632         if (!ioctl || (IOCTL(slave_dev, &ifr, SIOCETHTOOL) < 0)) {
 633                 return -1;
 634         }
 635
 636 verify:
 637         switch (etool.speed) {
 638         case SPEED_10:
 639         case SPEED_100:
 640         case SPEED_1000:
 641         case SPEED_10000:
 642                 break;
 643         default:
 644                 return -1;
 645         }
 646
 647         switch (etool.duplex) {
 648         case DUPLEX_FULL:
 649         case DUPLEX_HALF:
 650                 break;
 651         default:
 652                 return -1;
 653         }
 654
 655         slave->speed = etool.speed;
 656         slave->duplex = etool.duplex;
 657
 658         return 0;
 659 }
 660
 661 /*
 662  * if <dev> supports MII link status reporting, check its link status.
 663  *
 664  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 665  * depening upon the setting of the use_carrier parameter.
 666  *
 667  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 668  * can't tell and just pretend it is), or 0, meaning that the link is
 669  * down.
 670  *
 671  * If reporting is non-zero, instead of faking link up, return -1 if
 672  * both ETHTOOL and MII ioctls fail (meaning the device does not
 673  * support them).  If use_carrier is set, return whatever it says.
 674  * It'd be nice if there was a good way to tell if a driver supports
 675  * netif_carrier, but there really isn't.
 676  */
 677 static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
 678 {
 679         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 680         struct ifreq ifr;
 681         struct mii_ioctl_data *mii;
 682         struct ethtool_value etool;
 683
 684         if (bond->params.use_carrier) {
 685                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 686         }
 687
 688         ioctl = slave_dev->do_ioctl;
 689         if (ioctl) {
 690                 /* TODO: set pointer to correct ioctl on a per team member */
 691                 /*       bases to make this more efficient. that is, once  */
 692                 /*       we determine the correct ioctl, we will always    */
 693                 /*       call it and not the others for that team          */
 694                 /*       member.                                           */
 695
 696                 /*
 697                  * We cannot assume that SIOCGMIIPHY will also read a
 698                  * register; not all network drivers (e.g., e100)
 699                  * support that.
 700                  */
 701
 702                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 703                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 704                 mii = if_mii(&ifr);
 705                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 706                         mii->reg_num = MII_BMSR;
 707                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
 708                                 return (mii->val_out & BMSR_LSTATUS);
 709                         }
 710                 }
 711         }
 712
 713         /* try SIOCETHTOOL ioctl, some drivers cache ETHTOOL_GLINK */
 714         /* for a period of time so we attempt to get link status   */
 715         /* from it last if the above MII ioctls fail...            */
 716         if (slave_dev->ethtool_ops) {
 717                 if (slave_dev->ethtool_ops->get_link) {
 718                         u32 link;
 719
 720                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 721
 722                         return link ? BMSR_LSTATUS : 0;
 723                 }
 724         }
 725
 726         if (ioctl) {
 727                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 728                 etool.cmd = ETHTOOL_GLINK;
 729                 ifr.ifr_data = (char*)&etool;
 730                 if (IOCTL(slave_dev, &ifr, SIOCETHTOOL) == 0) {
 731                         if (etool.data == 1) {
 732                                 return BMSR_LSTATUS;
 733                         } else {
 734                                 dprintk("SIOCETHTOOL shows link down\n");
 735                                 return 0;
 736                         }
 737                 }
 738         }
 739
 740         /*
 741          * If reporting, report that either there's no dev->do_ioctl,
 742          * or both SIOCGMIIREG and SIOCETHTOOL failed (meaning that we
 743          * cannot report link status).  If not reporting, pretend
 744          * we're ok.
 745          */
 746         return (reporting ? -1 : BMSR_LSTATUS);
 747 }
 748
 749 /*----------------------------- Multicast list ------------------------------*/
 750
 751 /*
 752  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
 753  */
 754 static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
 755 {
 756         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
 757                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
 758 }
 759
 760 /*
 761  * returns dmi entry if found, NULL otherwise
 762  */
 763 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
 764 {
 765         struct dev_mc_list *idmi;
 766
 767         for (idmi = mc_list; idmi; idmi = idmi->next) {
 768                 if (bond_is_dmi_same(dmi, idmi)) {
 769                         return idmi;
 770                 }
 771         }
 772
 773         return NULL;
 774 }
 775
 776 /*
 777  * Push the promiscuity flag down to appropriate slaves
 778  */
 779 static void bond_set_promiscuity(struct bonding *bond, int inc)
 780 {
 781         if (USES_PRIMARY(bond->params.mode)) {
 782                 /* write lock already acquired */
 783                 if (bond->curr_active_slave) {
 784                         dev_set_promiscuity(bond->curr_active_slave->dev, inc);
 785                 }
 786         } else {
 787                 struct slave *slave;
 788                 int i;
 789                 bond_for_each_slave(bond, slave, i) {
 790                         dev_set_promiscuity(slave->dev, inc);
 791                 }
 792         }
 793 }
 794
 795 /*
 796  * Push the allmulti flag down to all slaves
 797  */
 798 static void bond_set_allmulti(struct bonding *bond, int inc)
 799 {
 800         if (USES_PRIMARY(bond->params.mode)) {
 801                 /* write lock already acquired */
 802                 if (bond->curr_active_slave) {
 803                         dev_set_allmulti(bond->curr_active_slave->dev, inc);
 804                 }
 805         } else {
 806                 struct slave *slave;
 807                 int i;
 808                 bond_for_each_slave(bond, slave, i) {
 809                         dev_set_allmulti(slave->dev, inc);
 810                 }
 811         }
 812 }
 813
 814 /*
 815  * Add a Multicast address to slaves
 816  * according to mode
 817  */
 818 static void bond_mc_add(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_add(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_add(slave->dev, addr, alen, 0);
 830                 }
 831         }
 832 }
 833
 834 /*
 835  * Remove a multicast address from slave
 836  * according to mode
 837  */
 838 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
 839 {
 840         if (USES_PRIMARY(bond->params.mode)) {
 841                 /* write lock already acquired */
 842                 if (bond->curr_active_slave) {
 843                         dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
 844                 }
 845         } else {
 846                 struct slave *slave;
 847                 int i;
 848                 bond_for_each_slave(bond, slave, i) {
 849                         dev_mc_delete(slave->dev, addr, alen, 0);
 850                 }
 851         }
 852 }
 853
 854 /*
 855  * Totally destroys the mc_list in bond
 856  */
 857 static void bond_mc_list_destroy(struct bonding *bond)
 858 {
 859         struct dev_mc_list *dmi;
 860
 861         dmi = bond->mc_list;
 862         while (dmi) {
 863                 bond->mc_list = dmi->next;
 864                 kfree(dmi);
 865                 dmi = bond->mc_list;
 866         }
 867 }
 868
 869 /*
 870  * Copy all the Multicast addresses from src to the bonding device dst
 871  */
 872 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
 873                              gfp_t gfp_flag)
 874 {
 875         struct dev_mc_list *dmi, *new_dmi;
 876
 877         for (dmi = mc_list; dmi; dmi = dmi->next) {
 878                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
 879
 880                 if (!new_dmi) {
 881                         /* FIXME: Potential memory leak !!! */
 882                         return -ENOMEM;
 883                 }
 884
 885                 new_dmi->next = bond->mc_list;
 886                 bond->mc_list = new_dmi;
 887                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
 888                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
 889                 new_dmi->dmi_users = dmi->dmi_users;
 890                 new_dmi->dmi_gusers = dmi->dmi_gusers;
 891         }
 892
 893         return 0;
 894 }
 895
 896 /*
 897  * flush all members of flush->mc_list from device dev->mc_list
 898  */
 899 static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
 900 {
 901         struct bonding *bond = bond_dev->priv;
 902         struct dev_mc_list *dmi;
 903
 904         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
 905                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 906         }
 907
 908         if (bond->params.mode == BOND_MODE_8023AD) {
 909                 /* del lacpdu mc addr from mc list */
 910                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 911
 912                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
 913         }
 914 }
 915
 916 /*--------------------------- Active slave change ---------------------------*/
 917
 918 /*
 919  * Update the mc list and multicast-related flags for the new and
 920  * old active slaves (if any) according to the multicast mode, and
 921  * promiscuous flags unconditionally.
 922  */
 923 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
 924 {
 925         struct dev_mc_list *dmi;
 926
 927         if (!USES_PRIMARY(bond->params.mode)) {
 928                 /* nothing to do -  mc list is already up-to-date on
 929                  * all slaves
 930                  */
 931                 return;
 932         }
 933
 934         if (old_active) {
 935                 if (bond->dev->flags & IFF_PROMISC) {
 936                         dev_set_promiscuity(old_active->dev, -1);
 937                 }
 938
 939                 if (bond->dev->flags & IFF_ALLMULTI) {
 940                         dev_set_allmulti(old_active->dev, -1);
 941                 }
 942
 943                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 944                         dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 945                 }
 946         }
 947
 948         if (new_active) {
 949                 if (bond->dev->flags & IFF_PROMISC) {
 950                         dev_set_promiscuity(new_active->dev, 1);
 951                 }
 952
 953                 if (bond->dev->flags & IFF_ALLMULTI) {
 954                         dev_set_allmulti(new_active->dev, 1);
 955                 }
 956
 957                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 958                         dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 959                 }
 960         }
 961 }
 962
 963 /**
 964  * find_best_interface - select the best available slave to be the active one
 965  * @bond: our bonding struct
 966  *
 967  * Warning: Caller must hold curr_slave_lock for writing.
 968  */
 969 static struct slave *bond_find_best_slave(struct bonding *bond)
 970 {
 971         struct slave *new_active, *old_active;
 972         struct slave *bestslave = NULL;
 973         int mintime = bond->params.updelay;
 974         int i;
 975
 976         new_active = old_active = bond->curr_active_slave;
 977
 978         if (!new_active) { /* there were no active slaves left */
 979                 if (bond->slave_cnt > 0) {  /* found one slave */
 980                         new_active = bond->first_slave;
 981                 } else {
 982                         return NULL; /* still no slave, return NULL */
 983                 }
 984         }
 985
 986         /* first try the primary link; if arping, a link must tx/rx traffic
 987          * before it can be considered the curr_active_slave - also, we would skip
 988          * slaves between the curr_active_slave and primary_slave that may be up
 989          * and able to arp
 990          */
 991         if ((bond->primary_slave) &&
 992             (!bond->params.arp_interval) &&
 993             (IS_UP(bond->primary_slave->dev))) {
 994                 new_active = bond->primary_slave;
 995         }
 996
 997         /* remember where to stop iterating over the slaves */
 998         old_active = new_active;
 999
1000         bond_for_each_slave_from(bond, new_active, i, old_active) {
1001                 if (IS_UP(new_active->dev)) {
1002                         if (new_active->link == BOND_LINK_UP) {
1003                                 return new_active;
1004                         } else if (new_active->link == BOND_LINK_BACK) {
1005                                 /* link up, but waiting for stabilization */
1006                                 if (new_active->delay < mintime) {
1007                                         mintime = new_active->delay;
1008                                         bestslave = new_active;
1009                                 }
1010                         }
1011                 }
1012         }
1013
1014         return bestslave;
1015 }
1016
1017 /**
1018  * change_active_interface - change the active slave into the specified one
1019  * @bond: our bonding struct
1020  * @new: the new slave to make the active one
1021  *
1022  * Set the new slave to the bond's settings and unset them on the old
1023  * curr_active_slave.
1024  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1025  *
1026  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1027  * because it is apparently the best available slave we have, even though its
1028  * updelay hasn't timed out yet.
1029  *
1030  * Warning: Caller must hold curr_slave_lock for writing.
1031  */
1032 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1033 {
1034         struct slave *old_active = bond->curr_active_slave;
1035
1036         if (old_active == new_active) {
1037                 return;
1038         }
1039
1040         if (new_active) {
1041                 if (new_active->link == BOND_LINK_BACK) {
1042                         if (USES_PRIMARY(bond->params.mode)) {
1043                                 printk(KERN_INFO DRV_NAME
1044                                        ": %s: making interface %s the new "
1045                                        "active one %d ms earlier.\n",
1046                                        bond->dev->name, new_active->dev->name,
1047                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1048                         }
1049
1050                         new_active->delay = 0;
1051                         new_active->link = BOND_LINK_UP;
1052                         new_active->jiffies = jiffies;
1053
1054                         if (bond->params.mode == BOND_MODE_8023AD) {
1055                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1056                         }
1057
1058                         if ((bond->params.mode == BOND_MODE_TLB) ||
1059                             (bond->params.mode == BOND_MODE_ALB)) {
1060                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1061                         }
1062                 } else {
1063                         if (USES_PRIMARY(bond->params.mode)) {
1064                                 printk(KERN_INFO DRV_NAME
1065                                        ": %s: making interface %s the new "
1066                                        "active one.\n",
1067                                        bond->dev->name, new_active->dev->name);
1068                         }
1069                 }
1070         }
1071
1072         if (USES_PRIMARY(bond->params.mode)) {
1073                 bond_mc_swap(bond, new_active, old_active);
1074         }
1075
1076         if ((bond->params.mode == BOND_MODE_TLB) ||
1077             (bond->params.mode == BOND_MODE_ALB)) {
1078                 bond_alb_handle_active_change(bond, new_active);
1079                 if (old_active)
1080                         bond_set_slave_inactive_flags(old_active);
1081                 if (new_active)
1082                         bond_set_slave_active_flags(new_active);
1083         } else {
1084                 bond->curr_active_slave = new_active;
1085         }
1086
1087         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1088                 if (old_active) {
1089                         bond_set_slave_inactive_flags(old_active);
1090                 }
1091
1092                 if (new_active) {
1093                         bond_set_slave_active_flags(new_active);
1094                 }
1095                 bond_send_gratuitous_arp(bond);
1096         }
1097 }
1098
1099 /**
1100  * bond_select_active_slave - select a new active slave, if needed
1101  * @bond: our bonding struct
1102  *
1103  * This functions shoud be called when one of the following occurs:
1104  * - The old curr_active_slave has been released or lost its link.
1105  * - The primary_slave has got its link back.
1106  * - A slave has got its link back and there's no old curr_active_slave.
1107  *
1108  * Warning: Caller must hold curr_slave_lock for writing.
1109  */
1110 void bond_select_active_slave(struct bonding *bond)
1111 {
1112         struct slave *best_slave;
1113         int rv;
1114
1115         best_slave = bond_find_best_slave(bond);
1116         if (best_slave != bond->curr_active_slave) {
1117                 bond_change_active_slave(bond, best_slave);
1118                 rv = bond_set_carrier(bond);
1119                 if (!rv)
1120                         return;
1121
1122                 if (netif_carrier_ok(bond->dev)) {
1123                         printk(KERN_INFO DRV_NAME
1124                                ": %s: first active interface up!\n",
1125                                bond->dev->name);
1126                 } else {
1127                         printk(KERN_INFO DRV_NAME ": %s: "
1128                                "now running without any active interface !\n",
1129                                bond->dev->name);
1130                 }
1131         }
1132 }
1133
1134 /*--------------------------- slave list handling ---------------------------*/
1135
1136 /*
1137  * This function attaches the slave to the end of list.
1138  *
1139  * bond->lock held for writing by caller.
1140  */
1141 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1142 {
1143         if (bond->first_slave == NULL) { /* attaching the first slave */
1144                 new_slave->next = new_slave;
1145                 new_slave->prev = new_slave;
1146                 bond->first_slave = new_slave;
1147         } else {
1148                 new_slave->next = bond->first_slave;
1149                 new_slave->prev = bond->first_slave->prev;
1150                 new_slave->next->prev = new_slave;
1151                 new_slave->prev->next = new_slave;
1152         }
1153
1154         bond->slave_cnt++;
1155 }
1156
1157 /*
1158  * This function detaches the slave from the list.
1159  * WARNING: no check is made to verify if the slave effectively
1160  * belongs to <bond>.
1161  * Nothing is freed on return, structures are just unchained.
1162  * If any slave pointer in bond was pointing to <slave>,
1163  * it should be changed by the calling function.
1164  *
1165  * bond->lock held for writing by caller.
1166  */
1167 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1168 {
1169         if (slave->next) {
1170                 slave->next->prev = slave->prev;
1171         }
1172
1173         if (slave->prev) {
1174                 slave->prev->next = slave->next;
1175         }
1176
1177         if (bond->first_slave == slave) { /* slave is the first slave */
1178                 if (bond->slave_cnt > 1) { /* there are more slave */
1179                         bond->first_slave = slave->next;
1180                 } else {
1181                         bond->first_slave = NULL; /* slave was the last one */
1182                 }
1183         }
1184
1185         slave->next = NULL;
1186         slave->prev = NULL;
1187         bond->slave_cnt--;
1188 }
1189
1190 /*---------------------------------- IOCTL ----------------------------------*/
1191
1192 int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev)
1193 {
1194         dprintk("bond_dev=%p\n", bond_dev);
1195         dprintk("slave_dev=%p\n", slave_dev);
1196         dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1197         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1198         return 0;
1199 }
1200
1201 #define BOND_INTERSECT_FEATURES \
1202         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_TSO | NETIF_F_UFO)
1203
1204 /*
1205  * Compute the common dev->feature set available to all slaves.  Some
1206  * feature bits are managed elsewhere, so preserve feature bits set on
1207  * master device that are not part of the examined set.
1208  */
1209 static int bond_compute_features(struct bonding *bond)
1210 {
1211         unsigned long features = BOND_INTERSECT_FEATURES;
1212         struct slave *slave;
1213         struct net_device *bond_dev = bond->dev;
1214         unsigned short max_hard_header_len = ETH_HLEN;
1215         int i;
1216
1217         bond_for_each_slave(bond, slave, i) {
1218                 features &= (slave->dev->features & BOND_INTERSECT_FEATURES);
1219                 if (slave->dev->hard_header_len > max_hard_header_len)
1220                         max_hard_header_len = slave->dev->hard_header_len;
1221         }
1222
1223         if ((features & NETIF_F_SG) &&
1224             !(features & NETIF_F_ALL_CSUM))
1225                 features &= ~NETIF_F_SG;
1226
1227         /*
1228          * features will include NETIF_F_TSO (NETIF_F_UFO) iff all
1229          * slave devices support NETIF_F_TSO (NETIF_F_UFO), which
1230          * implies that all slaves also support scatter-gather
1231          * (NETIF_F_SG), which implies that features also includes
1232          * NETIF_F_SG. So no need to check whether we have an
1233          * illegal combination of NETIF_F_{TSO,UFO} and
1234          * !NETIF_F_SG
1235          */
1236
1237         features |= (bond_dev->features & ~BOND_INTERSECT_FEATURES);
1238         bond_dev->features = features;
1239         bond_dev->hard_header_len = max_hard_header_len;
1240
1241         return 0;
1242 }
1243
1244 /* enslave device <slave> to bond device <master> */
1245 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1246 {
1247         struct bonding *bond = bond_dev->priv;
1248         struct slave *new_slave = NULL;
1249         struct dev_mc_list *dmi;
1250         struct sockaddr addr;
1251         int link_reporting;
1252         int old_features = bond_dev->features;
1253         int res = 0;
1254
1255         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1256                 slave_dev->do_ioctl == NULL) {
1257                 printk(KERN_WARNING DRV_NAME
1258                        ": %s: Warning: no link monitoring support for %s\n",
1259                        bond_dev->name, slave_dev->name);
1260         }
1261
1262         /* bond must be initialized by bond_open() before enslaving */
1263         if (!(bond_dev->flags & IFF_UP)) {
1264                 dprintk("Error, master_dev is not up\n");
1265                 return -EPERM;
1266         }
1267
1268         /* already enslaved */
1269         if (slave_dev->flags & IFF_SLAVE) {
1270                 dprintk("Error, Device was already enslaved\n");
1271                 return -EBUSY;
1272         }
1273
1274         /* vlan challenged mutual exclusion */
1275         /* no need to lock since we're protected by rtnl_lock */
1276         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1277                 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1278                 if (!list_empty(&bond->vlan_list)) {
1279                         printk(KERN_ERR DRV_NAME
1280                                ": %s: Error: cannot enslave VLAN "
1281                                "challenged slave %s on VLAN enabled "
1282                                "bond %s\n", bond_dev->name, slave_dev->name,
1283                                bond_dev->name);
1284                         return -EPERM;
1285                 } else {
1286                         printk(KERN_WARNING DRV_NAME
1287                                ": %s: Warning: enslaved VLAN challenged "
1288                                "slave %s. Adding VLANs will be blocked as "
1289                                "long as %s is part of bond %s\n",
1290                                bond_dev->name, slave_dev->name, slave_dev->name,
1291                                bond_dev->name);
1292                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1293                 }
1294         } else {
1295                 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1296                 if (bond->slave_cnt == 0) {
1297                         /* First slave, and it is not VLAN challenged,
1298                          * so remove the block of adding VLANs over the bond.
1299                          */
1300                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1301                 }
1302         }
1303
1304         /*
1305          * Old ifenslave binaries are no longer supported.  These can
1306          * be identified with moderate accurary by the state of the slave:
1307          * the current ifenslave will set the interface down prior to
1308          * enslaving it; the old ifenslave will not.
1309          */
1310         if ((slave_dev->flags & IFF_UP)) {
1311                 printk(KERN_ERR DRV_NAME ": %s is up. "
1312                        "This may be due to an out of date ifenslave.\n",
1313                        slave_dev->name);
1314                 res = -EPERM;
1315                 goto err_undo_flags;
1316         }
1317
1318         if (slave_dev->set_mac_address == NULL) {
1319                 printk(KERN_ERR DRV_NAME
1320                         ": %s: Error: The slave device you specified does "
1321                         "not support setting the MAC address. "
1322                         "Your kernel likely does not support slave "
1323                         "devices.\n", bond_dev->name);
1324                 res = -EOPNOTSUPP;
1325                 goto err_undo_flags;
1326         }
1327
1328         new_slave = kmalloc(sizeof(struct slave), GFP_KERNEL);
1329         if (!new_slave) {
1330                 res = -ENOMEM;
1331                 goto err_undo_flags;
1332         }
1333
1334         memset(new_slave, 0, sizeof(struct slave));
1335
1336         /* save slave's original flags before calling
1337          * netdev_set_master and dev_open
1338          */
1339         new_slave->original_flags = slave_dev->flags;
1340
1341         /*
1342          * Save slave's original ("permanent") mac address for modes
1343          * that need it, and for restoring it upon release, and then
1344          * set it to the master's address
1345          */
1346         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1347
1348         /*
1349          * Set slave to master's mac address.  The application already
1350          * set the master's mac address to that of the first slave
1351          */
1352         memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1353         addr.sa_family = slave_dev->type;
1354         res = dev_set_mac_address(slave_dev, &addr);
1355         if (res) {
1356                 dprintk("Error %d calling set_mac_address\n", res);
1357                 goto err_free;
1358         }
1359
1360         /* open the slave since the application closed it */
1361         res = dev_open(slave_dev);
1362         if (res) {
1363                 dprintk("Openning slave %s failed\n", slave_dev->name);
1364                 goto err_restore_mac;
1365         }
1366
1367         res = netdev_set_master(slave_dev, bond_dev);
1368         if (res) {
1369                 dprintk("Error %d calling netdev_set_master\n", res);
1370                 goto err_close;
1371         }
1372
1373         new_slave->dev = slave_dev;
1374         slave_dev->priv_flags |= IFF_BONDING;
1375
1376         if ((bond->params.mode == BOND_MODE_TLB) ||
1377             (bond->params.mode == BOND_MODE_ALB)) {
1378                 /* bond_alb_init_slave() must be called before all other stages since
1379                  * it might fail and we do not want to have to undo everything
1380                  */
1381                 res = bond_alb_init_slave(bond, new_slave);
1382                 if (res) {
1383                         goto err_unset_master;
1384                 }
1385         }
1386
1387         /* If the mode USES_PRIMARY, then the new slave gets the
1388          * master's promisc (and mc) settings only if it becomes the
1389          * curr_active_slave, and that is taken care of later when calling
1390          * bond_change_active()
1391          */
1392         if (!USES_PRIMARY(bond->params.mode)) {
1393                 /* set promiscuity level to new slave */
1394                 if (bond_dev->flags & IFF_PROMISC) {
1395                         dev_set_promiscuity(slave_dev, 1);
1396                 }
1397
1398                 /* set allmulti level to new slave */
1399                 if (bond_dev->flags & IFF_ALLMULTI) {
1400                         dev_set_allmulti(slave_dev, 1);
1401                 }
1402
1403                 /* upload master's mc_list to new slave */
1404                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1405                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1406                 }
1407         }
1408
1409         if (bond->params.mode == BOND_MODE_8023AD) {
1410                 /* add lacpdu mc addr to mc list */
1411                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1412
1413                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1414         }
1415
1416         bond_add_vlans_on_slave(bond, slave_dev);
1417
1418         write_lock_bh(&bond->lock);
1419
1420         bond_attach_slave(bond, new_slave);
1421
1422         new_slave->delay = 0;
1423         new_slave->link_failure_count = 0;
1424
1425         bond_compute_features(bond);
1426
1427         if (bond->params.miimon && !bond->params.use_carrier) {
1428                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1429
1430                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1431                         /*
1432                          * miimon is set but a bonded network driver
1433                          * does not support ETHTOOL/MII and
1434                          * arp_interval is not set.  Note: if
1435                          * use_carrier is enabled, we will never go
1436                          * here (because netif_carrier is always
1437                          * supported); thus, we don't need to change
1438                          * the messages for netif_carrier.
1439                          */
1440                         printk(KERN_WARNING DRV_NAME
1441                                ": %s: Warning: MII and ETHTOOL support not "
1442                                "available for interface %s, and "
1443                                "arp_interval/arp_ip_target module parameters "
1444                                "not specified, thus bonding will not detect "
1445                                "link failures! see bonding.txt for details.\n",
1446                                bond_dev->name, slave_dev->name);
1447                 } else if (link_reporting == -1) {
1448                         /* unable get link status using mii/ethtool */
1449                         printk(KERN_WARNING DRV_NAME
1450                                ": %s: Warning: can't get link status from "
1451                                "interface %s; the network driver associated "
1452                                "with this interface does not support MII or "
1453                                "ETHTOOL link status reporting, thus miimon "
1454                                "has no effect on this interface.\n",
1455                                bond_dev->name, slave_dev->name);
1456                 }
1457         }
1458
1459         /* check for initial state */
1460         if (!bond->params.miimon ||
1461             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1462                 if (bond->params.updelay) {
1463                         dprintk("Initial state of slave_dev is "
1464                                 "BOND_LINK_BACK\n");
1465                         new_slave->link  = BOND_LINK_BACK;
1466                         new_slave->delay = bond->params.updelay;
1467                 } else {
1468                         dprintk("Initial state of slave_dev is "
1469                                 "BOND_LINK_UP\n");
1470                         new_slave->link  = BOND_LINK_UP;
1471                 }
1472                 new_slave->jiffies = jiffies;
1473         } else {
1474                 dprintk("Initial state of slave_dev is "
1475                         "BOND_LINK_DOWN\n");
1476                 new_slave->link  = BOND_LINK_DOWN;
1477         }
1478
1479         if (bond_update_speed_duplex(new_slave) &&
1480             (new_slave->link != BOND_LINK_DOWN)) {
1481                 printk(KERN_WARNING DRV_NAME
1482                        ": %s: Warning: failed to get speed and duplex from %s, "
1483                        "assumed to be 100Mb/sec and Full.\n",
1484                        bond_dev->name, new_slave->dev->name);
1485
1486                 if (bond->params.mode == BOND_MODE_8023AD) {
1487                         printk(KERN_WARNING DRV_NAME
1488                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1489                                "support in base driver for proper aggregator "
1490                                "selection.\n", bond_dev->name);
1491                 }
1492         }
1493
1494         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1495                 /* if there is a primary slave, remember it */
1496                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1497                         bond->primary_slave = new_slave;
1498                 }
1499         }
1500
1501         switch (bond->params.mode) {
1502         case BOND_MODE_ACTIVEBACKUP:
1503                 /* if we're in active-backup mode, we need one and
1504                  * only one active interface. The backup interfaces
1505                  * will have their SLAVE_INACTIVE flag set because we
1506                  * need them to be drop all packets. Thus, since we
1507                  * guarantee that curr_active_slave always point to
1508                  * the last usable interface, we just have to verify
1509                  * this interface's flag.
1510                  */
1511                 if (((!bond->curr_active_slave) ||
1512                      (bond->curr_active_slave->dev->priv_flags & IFF_SLAVE_INACTIVE)) &&
1513                     (new_slave->link != BOND_LINK_DOWN)) {
1514                         /* first slave or no active slave yet, and this link
1515                            is OK, so make this interface the active one */
1516                         bond_change_active_slave(bond, new_slave);
1517                         printk(KERN_INFO DRV_NAME
1518                                ": %s: first active interface up!\n",
1519                                bond->dev->name);
1520                         netif_carrier_on(bond->dev);
1521
1522                 } else {
1523                         dprintk("This is just a backup slave\n");
1524                         bond_set_slave_inactive_flags(new_slave);
1525                 }
1526                 break;
1527         case BOND_MODE_8023AD:
1528                 /* in 802.3ad mode, the internal mechanism
1529                  * will activate the slaves in the selected
1530                  * aggregator
1531                  */
1532                 bond_set_slave_inactive_flags(new_slave);
1533                 /* if this is the first slave */
1534                 if (bond->slave_cnt == 1) {
1535                         SLAVE_AD_INFO(new_slave).id = 1;
1536                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1537                          * can be called only after the mac address of the bond is set
1538                          */
1539                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1540                                             bond->params.lacp_fast);
1541                 } else {
1542                         SLAVE_AD_INFO(new_slave).id =
1543                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1544                 }
1545
1546                 bond_3ad_bind_slave(new_slave);
1547                 break;
1548         case BOND_MODE_TLB:
1549         case BOND_MODE_ALB:
1550                 new_slave->state = BOND_STATE_ACTIVE;
1551                 if ((!bond->curr_active_slave) &&
1552                     (new_slave->link != BOND_LINK_DOWN)) {
1553                         /* first slave or no active slave yet, and this link
1554                          * is OK, so make this interface the active one
1555                          */
1556                         bond_change_active_slave(bond, new_slave);
1557                 } else {
1558                         bond_set_slave_inactive_flags(new_slave);
1559                 }
1560                 break;
1561         default:
1562                 dprintk("This slave is always active in trunk mode\n");
1563
1564                 /* always active in trunk mode */
1565                 new_slave->state = BOND_STATE_ACTIVE;
1566
1567                 /* In trunking mode there is little meaning to curr_active_slave
1568                  * anyway (it holds no special properties of the bond device),
1569                  * so we can change it without calling change_active_interface()
1570                  */
1571                 if (!bond->curr_active_slave) {
1572                         bond->curr_active_slave = new_slave;
1573                 }
1574                 break;
1575         } /* switch(bond_mode) */
1576
1577         bond_set_carrier(bond);
1578
1579         write_unlock_bh(&bond->lock);
1580
1581         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1582         if (res)
1583                 goto err_unset_master;
1584
1585         printk(KERN_INFO DRV_NAME
1586                ": %s: enslaving %s as a%s interface with a%s link.\n",
1587                bond_dev->name, slave_dev->name,
1588                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1589                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1590
1591         /* enslave is successful */
1592         return 0;
1593
1594 /* Undo stages on error */
1595 err_unset_master:
1596         netdev_set_master(slave_dev, NULL);
1597
1598 err_close:
1599         dev_close(slave_dev);
1600
1601 err_restore_mac:
1602         memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1603         addr.sa_family = slave_dev->type;
1604         dev_set_mac_address(slave_dev, &addr);
1605
1606 err_free:
1607         kfree(new_slave);
1608
1609 err_undo_flags:
1610         bond_dev->features = old_features;
1611
1612         return res;
1613 }
1614
1615 /*
1616  * Try to release the slave device <slave> from the bond device <master>
1617  * It is legal to access curr_active_slave without a lock because all the function
1618  * is write-locked.
1619  *
1620  * The rules for slave state should be:
1621  *   for Active/Backup:
1622  *     Active stays on all backups go down
1623  *   for Bonded connections:
1624  *     The first up interface should be left on and all others downed.
1625  */
1626 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1627 {
1628         struct bonding *bond = bond_dev->priv;
1629         struct slave *slave, *oldcurrent;
1630         struct sockaddr addr;
1631         int mac_addr_differ;
1632
1633         /* slave is not a slave or master is not master of this slave */
1634         if (!(slave_dev->flags & IFF_SLAVE) ||
1635             (slave_dev->master != bond_dev)) {
1636                 printk(KERN_ERR DRV_NAME
1637                        ": %s: Error: cannot release %s.\n",
1638                        bond_dev->name, slave_dev->name);
1639                 return -EINVAL;
1640         }
1641
1642         write_lock_bh(&bond->lock);
1643
1644         slave = bond_get_slave_by_dev(bond, slave_dev);
1645         if (!slave) {
1646                 /* not a slave of this bond */
1647                 printk(KERN_INFO DRV_NAME
1648                        ": %s: %s not enslaved\n",
1649                        bond_dev->name, slave_dev->name);
1650                 write_unlock_bh(&bond->lock);
1651                 return -EINVAL;
1652         }
1653
1654         mac_addr_differ = memcmp(bond_dev->dev_addr,
1655                                  slave->perm_hwaddr,
1656                                  ETH_ALEN);
1657         if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1658                 printk(KERN_WARNING DRV_NAME
1659                        ": %s: Warning: the permanent HWaddr of %s "
1660                        "- %02X:%02X:%02X:%02X:%02X:%02X - is "
1661                        "still in use by %s. Set the HWaddr of "
1662                        "%s to a different address to avoid "
1663                        "conflicts.\n",
1664                        bond_dev->name,
1665                        slave_dev->name,
1666                        slave->perm_hwaddr[0],
1667                        slave->perm_hwaddr[1],
1668                        slave->perm_hwaddr[2],
1669                        slave->perm_hwaddr[3],
1670                        slave->perm_hwaddr[4],
1671                        slave->perm_hwaddr[5],
1672                        bond_dev->name,
1673                        slave_dev->name);
1674         }
1675
1676         /* Inform AD package of unbinding of slave. */
1677         if (bond->params.mode == BOND_MODE_8023AD) {
1678                 /* must be called before the slave is
1679                  * detached from the list
1680                  */
1681                 bond_3ad_unbind_slave(slave);
1682         }
1683
1684         printk(KERN_INFO DRV_NAME
1685                ": %s: releasing %s interface %s\n",
1686                bond_dev->name,
1687                (slave->state == BOND_STATE_ACTIVE)
1688                ? "active" : "backup",
1689                slave_dev->name);
1690
1691         oldcurrent = bond->curr_active_slave;
1692
1693         bond->current_arp_slave = NULL;
1694
1695         /* release the slave from its bond */
1696         bond_detach_slave(bond, slave);
1697
1698         bond_compute_features(bond);
1699
1700         if (bond->primary_slave == slave) {
1701                 bond->primary_slave = NULL;
1702         }
1703
1704         if (oldcurrent == slave) {
1705                 bond_change_active_slave(bond, NULL);
1706         }
1707
1708         if ((bond->params.mode == BOND_MODE_TLB) ||
1709             (bond->params.mode == BOND_MODE_ALB)) {
1710                 /* Must be called only after the slave has been
1711                  * detached from the list and the curr_active_slave
1712                  * has been cleared (if our_slave == old_current),
1713                  * but before a new active slave is selected.
1714                  */
1715                 bond_alb_deinit_slave(bond, slave);
1716         }
1717
1718         if (oldcurrent == slave)
1719                 bond_select_active_slave(bond);
1720
1721         if (bond->slave_cnt == 0) {
1722                 bond_set_carrier(bond);
1723
1724                 /* if the last slave was removed, zero the mac address
1725                  * of the master so it will be set by the application
1726                  * to the mac address of the first slave
1727                  */
1728                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1729
1730                 if (list_empty(&bond->vlan_list)) {
1731                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1732                 } else {
1733                         printk(KERN_WARNING DRV_NAME
1734                                ": %s: Warning: clearing HW address of %s while it "
1735                                "still has VLANs.\n",
1736                                bond_dev->name, bond_dev->name);
1737                         printk(KERN_WARNING DRV_NAME
1738                                ": %s: When re-adding slaves, make sure the bond's "
1739                                "HW address matches its VLANs'.\n",
1740                                bond_dev->name);
1741                 }
1742         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1743                    !bond_has_challenged_slaves(bond)) {
1744                 printk(KERN_INFO DRV_NAME
1745                        ": %s: last VLAN challenged slave %s "
1746                        "left bond %s. VLAN blocking is removed\n",
1747                        bond_dev->name, slave_dev->name, bond_dev->name);
1748                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1749         }
1750
1751         write_unlock_bh(&bond->lock);
1752
1753         /* must do this from outside any spinlocks */
1754         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1755
1756         bond_del_vlans_from_slave(bond, slave_dev);
1757
1758         /* If the mode USES_PRIMARY, then we should only remove its
1759          * promisc and mc settings if it was the curr_active_slave, but that was
1760          * already taken care of above when we detached the slave
1761          */
1762         if (!USES_PRIMARY(bond->params.mode)) {
1763                 /* unset promiscuity level from slave */
1764                 if (bond_dev->flags & IFF_PROMISC) {
1765                         dev_set_promiscuity(slave_dev, -1);
1766                 }
1767
1768                 /* unset allmulti level from slave */
1769                 if (bond_dev->flags & IFF_ALLMULTI) {
1770                         dev_set_allmulti(slave_dev, -1);
1771                 }
1772
1773                 /* flush master's mc_list from slave */
1774                 bond_mc_list_flush(bond_dev, slave_dev);
1775         }
1776
1777         netdev_set_master(slave_dev, NULL);
1778
1779         /* close slave before restoring its mac address */
1780         dev_close(slave_dev);
1781
1782         /* restore original ("permanent") mac address */
1783         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1784         addr.sa_family = slave_dev->type;
1785         dev_set_mac_address(slave_dev, &addr);
1786
1787         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1788                                    IFF_SLAVE_INACTIVE | IFF_BONDING);
1789
1790         kfree(slave);
1791
1792         return 0;  /* deletion OK */
1793 }
1794
1795 /*
1796  * This function releases all slaves.
1797  */
1798 static int bond_release_all(struct net_device *bond_dev)
1799 {
1800         struct bonding *bond = bond_dev->priv;
1801         struct slave *slave;
1802         struct net_device *slave_dev;
1803         struct sockaddr addr;
1804
1805         write_lock_bh(&bond->lock);
1806
1807         netif_carrier_off(bond_dev);
1808
1809         if (bond->slave_cnt == 0) {
1810                 goto out;
1811         }
1812
1813         bond->current_arp_slave = NULL;
1814         bond->primary_slave = NULL;
1815         bond_change_active_slave(bond, NULL);
1816
1817         while ((slave = bond->first_slave) != NULL) {
1818                 /* Inform AD package of unbinding of slave
1819                  * before slave is detached from the list.
1820                  */
1821                 if (bond->params.mode == BOND_MODE_8023AD) {
1822                         bond_3ad_unbind_slave(slave);
1823                 }
1824
1825                 slave_dev = slave->dev;
1826                 bond_detach_slave(bond, slave);
1827
1828                 if ((bond->params.mode == BOND_MODE_TLB) ||
1829                     (bond->params.mode == BOND_MODE_ALB)) {
1830                         /* must be called only after the slave
1831                          * has been detached from the list
1832                          */
1833                         bond_alb_deinit_slave(bond, slave);
1834                 }
1835
1836                 bond_compute_features(bond);
1837
1838                 /* now that the slave is detached, unlock and perform
1839                  * all the undo steps that should not be called from
1840                  * within a lock.
1841                  */
1842                 write_unlock_bh(&bond->lock);
1843
1844                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1845                 bond_del_vlans_from_slave(bond, slave_dev);
1846
1847                 /* If the mode USES_PRIMARY, then we should only remove its
1848                  * promisc and mc settings if it was the curr_active_slave, but that was
1849                  * already taken care of above when we detached the slave
1850                  */
1851                 if (!USES_PRIMARY(bond->params.mode)) {
1852                         /* unset promiscuity level from slave */
1853                         if (bond_dev->flags & IFF_PROMISC) {
1854                                 dev_set_promiscuity(slave_dev, -1);
1855                         }
1856
1857                         /* unset allmulti level from slave */
1858                         if (bond_dev->flags & IFF_ALLMULTI) {
1859                                 dev_set_allmulti(slave_dev, -1);
1860                         }
1861
1862                         /* flush master's mc_list from slave */
1863                         bond_mc_list_flush(bond_dev, slave_dev);
1864                 }
1865
1866                 netdev_set_master(slave_dev, NULL);
1867
1868                 /* close slave before restoring its mac address */
1869                 dev_close(slave_dev);
1870
1871                 /* restore original ("permanent") mac address*/
1872                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1873                 addr.sa_family = slave_dev->type;
1874                 dev_set_mac_address(slave_dev, &addr);
1875
1876                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1877                                            IFF_SLAVE_INACTIVE);
1878
1879                 kfree(slave);
1880
1881                 /* re-acquire the lock before getting the next slave */
1882                 write_lock_bh(&bond->lock);
1883         }
1884
1885         /* zero the mac address of the master so it will be
1886          * set by the application to the mac address of the
1887          * first slave
1888          */
1889         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1890
1891         if (list_empty(&bond->vlan_list)) {
1892                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1893         } else {
1894                 printk(KERN_WARNING DRV_NAME
1895                        ": %s: Warning: clearing HW address of %s while it "
1896                        "still has VLANs.\n",
1897                        bond_dev->name, bond_dev->name);
1898                 printk(KERN_WARNING DRV_NAME
1899                        ": %s: When re-adding slaves, make sure the bond's "
1900                        "HW address matches its VLANs'.\n",
1901                        bond_dev->name);
1902         }
1903
1904         printk(KERN_INFO DRV_NAME
1905                ": %s: released all slaves\n",
1906                bond_dev->name);
1907
1908 out:
1909         write_unlock_bh(&bond->lock);
1910
1911         return 0;
1912 }
1913
1914 /*
1915  * This function changes the active slave to slave <slave_dev>.
1916  * It returns -EINVAL in the following cases.
1917  *  - <slave_dev> is not found in the list.
1918  *  - There is not active slave now.
1919  *  - <slave_dev> is already active.
1920  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1921  *  - <slave_dev> is not running.
1922  * In these cases, this fuction does nothing.
1923  * In the other cases, currnt_slave pointer is changed and 0 is returned.
1924  */
1925 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1926 {
1927         struct bonding *bond = bond_dev->priv;
1928         struct slave *old_active = NULL;
1929         struct slave *new_active = NULL;
1930         int res = 0;
1931
1932         if (!USES_PRIMARY(bond->params.mode)) {
1933                 return -EINVAL;
1934         }
1935
1936         /* Verify that master_dev is indeed the master of slave_dev */
1937         if (!(slave_dev->flags & IFF_SLAVE) ||
1938             (slave_dev->master != bond_dev)) {
1939                 return -EINVAL;
1940         }
1941
1942         write_lock_bh(&bond->lock);
1943
1944         old_active = bond->curr_active_slave;
1945         new_active = bond_get_slave_by_dev(bond, slave_dev);
1946
1947         /*
1948          * Changing to the current active: do nothing; return success.
1949          */
1950         if (new_active && (new_active == old_active)) {
1951                 write_unlock_bh(&bond->lock);
1952                 return 0;
1953         }
1954
1955         if ((new_active) &&
1956             (old_active) &&
1957             (new_active->link == BOND_LINK_UP) &&
1958             IS_UP(new_active->dev)) {
1959                 bond_change_active_slave(bond, new_active);
1960         } else {
1961                 res = -EINVAL;
1962         }
1963
1964         write_unlock_bh(&bond->lock);
1965
1966         return res;
1967 }
1968
1969 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1970 {
1971         struct bonding *bond = bond_dev->priv;
1972
1973         info->bond_mode = bond->params.mode;
1974         info->miimon = bond->params.miimon;
1975
1976         read_lock_bh(&bond->lock);
1977         info->num_slaves = bond->slave_cnt;
1978         read_unlock_bh(&bond->lock);
1979
1980         return 0;
1981 }
1982
1983 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1984 {
1985         struct bonding *bond = bond_dev->priv;
1986         struct slave *slave;
1987         int i, found = 0;
1988
1989         if (info->slave_id < 0) {
1990                 return -ENODEV;
1991         }
1992
1993         read_lock_bh(&bond->lock);
1994
1995         bond_for_each_slave(bond, slave, i) {
1996                 if (i == (int)info->slave_id) {
1997                         found = 1;
1998                         break;
1999                 }
2000         }
2001
2002         read_unlock_bh(&bond->lock);
2003
2004         if (found) {
2005                 strcpy(info->slave_name, slave->dev->name);
2006                 info->link = slave->link;
2007                 info->state = slave->state;
2008                 info->link_failure_count = slave->link_failure_count;
2009         } else {
2010                 return -ENODEV;
2011         }
2012
2013         return 0;
2014 }
2015
2016 /*-------------------------------- Monitoring -------------------------------*/
2017
2018 /* this function is called regularly to monitor each slave's link. */
2019 void bond_mii_monitor(struct net_device *bond_dev)
2020 {
2021         struct bonding *bond = bond_dev->priv;
2022         struct slave *slave, *oldcurrent;
2023         int do_failover = 0;
2024         int delta_in_ticks;
2025         int i;
2026
2027         read_lock(&bond->lock);
2028
2029         delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2030
2031         if (bond->kill_timers) {
2032                 goto out;
2033         }
2034
2035         if (bond->slave_cnt == 0) {
2036                 goto re_arm;
2037         }
2038
2039         /* we will try to read the link status of each of our slaves, and
2040          * set their IFF_RUNNING flag appropriately. For each slave not
2041          * supporting MII status, we won't do anything so that a user-space
2042          * program could monitor the link itself if needed.
2043          */
2044
2045         read_lock(&bond->curr_slave_lock);
2046         oldcurrent = bond->curr_active_slave;
2047         read_unlock(&bond->curr_slave_lock);
2048
2049         bond_for_each_slave(bond, slave, i) {
2050                 struct net_device *slave_dev = slave->dev;
2051                 int link_state;
2052                 u16 old_speed = slave->speed;
2053                 u8 old_duplex = slave->duplex;
2054
2055                 link_state = bond_check_dev_link(bond, slave_dev, 0);
2056
2057                 switch (slave->link) {
2058                 case BOND_LINK_UP:      /* the link was up */
2059                         if (link_state == BMSR_LSTATUS) {
2060                                 /* link stays up, nothing more to do */
2061                                 break;
2062                         } else { /* link going down */
2063                                 slave->link  = BOND_LINK_FAIL;
2064                                 slave->delay = bond->params.downdelay;
2065
2066                                 if (slave->link_failure_count < UINT_MAX) {
2067                                         slave->link_failure_count++;
2068                                 }
2069
2070                                 if (bond->params.downdelay) {
2071                                         printk(KERN_INFO DRV_NAME
2072                                                ": %s: link status down for %s "
2073                                                "interface %s, disabling it in "
2074                                                "%d ms.\n",
2075                                                bond_dev->name,
2076                                                IS_UP(slave_dev)
2077                                                ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2078                                                   ? ((slave == oldcurrent)
2079                                                      ? "active " : "backup ")
2080                                                   : "")
2081                                                : "idle ",
2082                                                slave_dev->name,
2083                                                bond->params.downdelay * bond->params.miimon);
2084                                 }
2085                         }
2086                         /* no break ! fall through the BOND_LINK_FAIL test to
2087                            ensure proper action to be taken
2088                         */
2089                 case BOND_LINK_FAIL:    /* the link has just gone down */
2090                         if (link_state != BMSR_LSTATUS) {
2091                                 /* link stays down */
2092                                 if (slave->delay <= 0) {
2093                                         /* link down for too long time */
2094                                         slave->link = BOND_LINK_DOWN;
2095
2096                                         /* in active/backup mode, we must
2097                                          * completely disable this interface
2098                                          */
2099                                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2100                                             (bond->params.mode == BOND_MODE_8023AD)) {
2101                                                 bond_set_slave_inactive_flags(slave);
2102                                         }
2103
2104                                         printk(KERN_INFO DRV_NAME
2105                                                ": %s: link status definitely "
2106                                                "down for interface %s, "
2107                                                "disabling it\n",
2108                                                bond_dev->name,
2109                                                slave_dev->name);
2110
2111                                         /* notify ad that the link status has changed */
2112                                         if (bond->params.mode == BOND_MODE_8023AD) {
2113                                                 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2114                                         }
2115
2116                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2117                                             (bond->params.mode == BOND_MODE_ALB)) {
2118                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2119                                         }
2120
2121                                         if (slave == oldcurrent) {
2122                                                 do_failover = 1;
2123                                         }
2124                                 } else {
2125                                         slave->delay--;
2126                                 }
2127                         } else {
2128                                 /* link up again */
2129                                 slave->link  = BOND_LINK_UP;
2130                                 slave->jiffies = jiffies;
2131                                 printk(KERN_INFO DRV_NAME
2132                                        ": %s: link status up again after %d "
2133                                        "ms for interface %s.\n",
2134                                        bond_dev->name,
2135                                        (bond->params.downdelay - slave->delay) * bond->params.miimon,
2136                                        slave_dev->name);
2137                         }
2138                         break;
2139                 case BOND_LINK_DOWN:    /* the link was down */
2140                         if (link_state != BMSR_LSTATUS) {
2141                                 /* the link stays down, nothing more to do */
2142                                 break;
2143                         } else {        /* link going up */
2144                                 slave->link  = BOND_LINK_BACK;
2145                                 slave->delay = bond->params.updelay;
2146
2147                                 if (bond->params.updelay) {
2148                                         /* if updelay == 0, no need to
2149                                            advertise about a 0 ms delay */
2150                                         printk(KERN_INFO DRV_NAME
2151                                                ": %s: link status up for "
2152                                                "interface %s, enabling it "
2153                                                "in %d ms.\n",
2154                                                bond_dev->name,
2155                                                slave_dev->name,
2156                                                bond->params.updelay * bond->params.miimon);
2157                                 }
2158                         }
2159                         /* no break ! fall through the BOND_LINK_BACK state in
2160                            case there's something to do.
2161                         */
2162                 case BOND_LINK_BACK:    /* the link has just come back */
2163                         if (link_state != BMSR_LSTATUS) {
2164                                 /* link down again */
2165                                 slave->link  = BOND_LINK_DOWN;
2166
2167                                 printk(KERN_INFO DRV_NAME
2168                                        ": %s: link status down again after %d "
2169                                        "ms for interface %s.\n",
2170                                        bond_dev->name,
2171                                        (bond->params.updelay - slave->delay) * bond->params.miimon,
2172                                        slave_dev->name);
2173                         } else {
2174                                 /* link stays up */
2175                                 if (slave->delay == 0) {
2176                                         /* now the link has been up for long time enough */
2177                                         slave->link = BOND_LINK_UP;
2178                                         slave->jiffies = jiffies;
2179
2180                                         if (bond->params.mode == BOND_MODE_8023AD) {
2181                                                 /* prevent it from being the active one */
2182                                                 slave->state = BOND_STATE_BACKUP;
2183                                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2184                                                 /* make it immediately active */
2185                                                 slave->state = BOND_STATE_ACTIVE;
2186                                         } else if (slave != bond->primary_slave) {
2187                                                 /* prevent it from being the active one */
2188                                                 slave->state = BOND_STATE_BACKUP;
2189                                         }
2190
2191                                         printk(KERN_INFO DRV_NAME
2192                                                ": %s: link status definitely "
2193                                                "up for interface %s.\n",
2194                                                bond_dev->name,
2195                                                slave_dev->name);
2196
2197                                         /* notify ad that the link status has changed */
2198                                         if (bond->params.mode == BOND_MODE_8023AD) {
2199                                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2200                                         }
2201
2202                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2203                                             (bond->params.mode == BOND_MODE_ALB)) {
2204                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2205                                         }
2206
2207                                         if ((!oldcurrent) ||
2208                                             (slave == bond->primary_slave)) {
2209                                                 do_failover = 1;
2210                                         }
2211                                 } else {
2212                                         slave->delay--;
2213                                 }
2214                         }
2215                         break;
2216                 default:
2217                         /* Should not happen */
2218                         printk(KERN_ERR DRV_NAME
2219                                ": %s: Error: %s Illegal value (link=%d)\n",
2220                                bond_dev->name,
2221                                slave->dev->name,
2222                                slave->link);
2223                         goto out;
2224                 } /* end of switch (slave->link) */
2225
2226                 bond_update_speed_duplex(slave);
2227
2228                 if (bond->params.mode == BOND_MODE_8023AD) {
2229                         if (old_speed != slave->speed) {
2230                                 bond_3ad_adapter_speed_changed(slave);
2231                         }
2232
2233                         if (old_duplex != slave->duplex) {
2234                                 bond_3ad_adapter_duplex_changed(slave);
2235                         }
2236                 }
2237
2238         } /* end of for */
2239
2240         if (do_failover) {
2241                 write_lock(&bond->curr_slave_lock);
2242
2243                 bond_select_active_slave(bond);
2244
2245                 write_unlock(&bond->curr_slave_lock);
2246         } else
2247                 bond_set_carrier(bond);
2248
2249 re_arm:
2250         if (bond->params.miimon) {
2251                 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2252         }
2253 out:
2254         read_unlock(&bond->lock);
2255 }
2256
2257
2258 static u32 bond_glean_dev_ip(struct net_device *dev)
2259 {
2260         struct in_device *idev;
2261         struct in_ifaddr *ifa;
2262         u32 addr = 0;
2263
2264         if (!dev)
2265                 return 0;
2266
2267         rcu_read_lock();
2268         idev = __in_dev_get_rcu(dev);
2269         if (!idev)
2270                 goto out;
2271
2272         ifa = idev->ifa_list;
2273         if (!ifa)
2274                 goto out;
2275
2276         addr = ifa->ifa_local;
2277 out:
2278         rcu_read_unlock();
2279         return addr;
2280 }
2281
2282 static int bond_has_ip(struct bonding *bond)
2283 {
2284         struct vlan_entry *vlan, *vlan_next;
2285
2286         if (bond->master_ip)
2287                 return 1;
2288
2289         if (list_empty(&bond->vlan_list))
2290                 return 0;
2291
2292         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2293                                  vlan_list) {
2294                 if (vlan->vlan_ip)
2295                         return 1;
2296         }
2297
2298         return 0;
2299 }
2300
2301 /*
2302  * We go to the (large) trouble of VLAN tagging ARP frames because
2303  * switches in VLAN mode (especially if ports are configured as
2304  * "native" to a VLAN) might not pass non-tagged frames.
2305  */
2306 static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
2307 {
2308         struct sk_buff *skb;
2309
2310         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2311                slave_dev->name, dest_ip, src_ip, vlan_id);
2312
2313         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2314                          NULL, slave_dev->dev_addr, NULL);
2315
2316         if (!skb) {
2317                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2318                 return;
2319         }
2320         if (vlan_id) {
2321                 skb = vlan_put_tag(skb, vlan_id);
2322                 if (!skb) {
2323                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2324                         return;
2325                 }
2326         }
2327         arp_xmit(skb);
2328 }
2329
2330
2331 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2332 {
2333         int i, vlan_id, rv;
2334         u32 *targets = bond->params.arp_targets;
2335         struct vlan_entry *vlan, *vlan_next;
2336         struct net_device *vlan_dev;
2337         struct flowi fl;
2338         struct rtable *rt;
2339
2340         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2341                 if (!targets[i])
2342                         continue;
2343                 dprintk("basa: target %x\n", targets[i]);
2344                 if (list_empty(&bond->vlan_list)) {
2345                         dprintk("basa: empty vlan: arp_send\n");
2346                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2347                                       bond->master_ip, 0);
2348                         continue;
2349                 }
2350
2351                 /*
2352                  * If VLANs are configured, we do a route lookup to
2353                  * determine which VLAN interface would be used, so we
2354                  * can tag the ARP with the proper VLAN tag.
2355                  */
2356                 memset(&fl, 0, sizeof(fl));
2357                 fl.fl4_dst = targets[i];
2358                 fl.fl4_tos = RTO_ONLINK;
2359
2360                 rv = ip_route_output_key(&rt, &fl);
2361                 if (rv) {
2362                         if (net_ratelimit()) {
2363                                 printk(KERN_WARNING DRV_NAME
2364                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2365                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2366                         }
2367                         continue;
2368                 }
2369
2370                 /*
2371                  * This target is not on a VLAN
2372                  */
2373                 if (rt->u.dst.dev == bond->dev) {
2374                         ip_rt_put(rt);
2375                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2376                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2377                                       bond->master_ip, 0);
2378                         continue;
2379                 }
2380
2381                 vlan_id = 0;
2382                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2383                                          vlan_list) {
2384                         vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2385                         if (vlan_dev == rt->u.dst.dev) {
2386                                 vlan_id = vlan->vlan_id;
2387                                 dprintk("basa: vlan match on %s %d\n",
2388                                        vlan_dev->name, vlan_id);
2389                                 break;
2390                         }
2391                 }
2392
2393                 if (vlan_id) {
2394                         ip_rt_put(rt);
2395                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2396                                       vlan->vlan_ip, vlan_id);
2397                         continue;
2398                 }
2399
2400                 if (net_ratelimit()) {
2401                         printk(KERN_WARNING DRV_NAME
2402                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2403                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2404                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2405                 }
2406                 ip_rt_put(rt);
2407         }
2408 }
2409
2410 /*
2411  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2412  * for each VLAN above us.
2413  */
2414 static void bond_send_gratuitous_arp(struct bonding *bond)
2415 {
2416         struct slave *slave = bond->curr_active_slave;
2417         struct vlan_entry *vlan;
2418         struct net_device *vlan_dev;
2419
2420         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2421                                 slave ? slave->dev->name : "NULL");
2422         if (!slave)
2423                 return;
2424
2425         if (bond->master_ip) {
2426                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2427                                   bond->master_ip, 0);
2428         }
2429
2430         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2431                 vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
2432                 if (vlan->vlan_ip) {
2433                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2434                                       vlan->vlan_ip, vlan->vlan_id);
2435                 }
2436         }
2437 }
2438
2439 /*
2440  * this function is called regularly to monitor each slave's link
2441  * ensuring that traffic is being sent and received when arp monitoring
2442  * is used in load-balancing mode. if the adapter has been dormant, then an
2443  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2444  * arp monitoring in active backup mode.
2445  */
2446 void bond_loadbalance_arp_mon(struct net_device *bond_dev)
2447 {
2448         struct bonding *bond = bond_dev->priv;
2449         struct slave *slave, *oldcurrent;
2450         int do_failover = 0;
2451         int delta_in_ticks;
2452         int i;
2453
2454         read_lock(&bond->lock);
2455
2456         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2457
2458         if (bond->kill_timers) {
2459                 goto out;
2460         }
2461
2462         if (bond->slave_cnt == 0) {
2463                 goto re_arm;
2464         }
2465
2466         read_lock(&bond->curr_slave_lock);
2467         oldcurrent = bond->curr_active_slave;
2468         read_unlock(&bond->curr_slave_lock);
2469
2470         /* see if any of the previous devices are up now (i.e. they have
2471          * xmt and rcv traffic). the curr_active_slave does not come into
2472          * the picture unless it is null. also, slave->jiffies is not needed
2473          * here because we send an arp on each slave and give a slave as
2474          * long as it needs to get the tx/rx within the delta.
2475          * TODO: what about up/down delay in arp mode? it wasn't here before
2476          *       so it can wait
2477          */
2478         bond_for_each_slave(bond, slave, i) {
2479                 if (slave->link != BOND_LINK_UP) {
2480                         if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2481                             ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2482
2483                                 slave->link  = BOND_LINK_UP;
2484                                 slave->state = BOND_STATE_ACTIVE;
2485
2486                                 /* primary_slave has no meaning in round-robin
2487                                  * mode. the window of a slave being up and
2488                                  * curr_active_slave being null after enslaving
2489                                  * is closed.
2490                                  */
2491                                 if (!oldcurrent) {
2492                                         printk(KERN_INFO DRV_NAME
2493                                                ": %s: link status definitely "
2494                                                "up for interface %s, ",
2495                                                bond_dev->name,
2496                                                slave->dev->name);
2497                                         do_failover = 1;
2498                                 } else {
2499                                         printk(KERN_INFO DRV_NAME
2500                                                ": %s: interface %s is now up\n",
2501                                                bond_dev->name,
2502                                                slave->dev->name);
2503                                 }
2504                         }
2505                 } else {
2506                         /* slave->link == BOND_LINK_UP */
2507
2508                         /* not all switches will respond to an arp request
2509                          * when the source ip is 0, so don't take the link down
2510                          * if we don't know our ip yet
2511                          */
2512                         if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2513                             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2514                              bond_has_ip(bond))) {
2515
2516                                 slave->link  = BOND_LINK_DOWN;
2517                                 slave->state = BOND_STATE_BACKUP;
2518
2519                                 if (slave->link_failure_count < UINT_MAX) {
2520                                         slave->link_failure_count++;
2521                                 }
2522
2523                                 printk(KERN_INFO DRV_NAME
2524                                        ": %s: interface %s is now down.\n",
2525                                        bond_dev->name,
2526                                        slave->dev->name);
2527
2528                                 if (slave == oldcurrent) {
2529                                         do_failover = 1;
2530                                 }
2531                         }
2532                 }
2533
2534                 /* note: if switch is in round-robin mode, all links
2535                  * must tx arp to ensure all links rx an arp - otherwise
2536                  * links may oscillate or not come up at all; if switch is
2537                  * in something like xor mode, there is nothing we can
2538                  * do - all replies will be rx'ed on same link causing slaves
2539                  * to be unstable during low/no traffic periods
2540                  */
2541                 if (IS_UP(slave->dev)) {
2542                         bond_arp_send_all(bond, slave);
2543                 }
2544         }
2545
2546         if (do_failover) {
2547                 write_lock(&bond->curr_slave_lock);
2548
2549                 bond_select_active_slave(bond);
2550
2551                 write_unlock(&bond->curr_slave_lock);
2552         }
2553
2554 re_arm:
2555         if (bond->params.arp_interval) {
2556                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2557         }
2558 out:
2559         read_unlock(&bond->lock);
2560 }
2561
2562 /*
2563  * When using arp monitoring in active-backup mode, this function is
2564  * called to determine if any backup slaves have went down or a new
2565  * current slave needs to be found.
2566  * The backup slaves never generate traffic, they are considered up by merely
2567  * receiving traffic. If the current slave goes down, each backup slave will
2568  * be given the opportunity to tx/rx an arp before being taken down - this
2569  * prevents all slaves from being taken down due to the current slave not
2570  * sending any traffic for the backups to receive. The arps are not necessarily
2571  * necessary, any tx and rx traffic will keep the current slave up. While any
2572  * rx traffic will keep the backup slaves up, the current slave is responsible
2573  * for generating traffic to keep them up regardless of any other traffic they
2574  * may have received.
2575  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2576  */
2577 void bond_activebackup_arp_mon(struct net_device *bond_dev)
2578 {
2579         struct bonding *bond = bond_dev->priv;
2580         struct slave *slave;
2581         int delta_in_ticks;
2582         int i;
2583
2584         read_lock(&bond->lock);
2585
2586         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2587
2588         if (bond->kill_timers) {
2589                 goto out;
2590         }
2591
2592         if (bond->slave_cnt == 0) {
2593                 goto re_arm;
2594         }
2595
2596         /* determine if any slave has come up or any backup slave has
2597          * gone down
2598          * TODO: what about up/down delay in arp mode? it wasn't here before
2599          *       so it can wait
2600          */
2601         bond_for_each_slave(bond, slave, i) {
2602                 if (slave->link != BOND_LINK_UP) {
2603                         if ((jiffies - slave->dev->last_rx) <= delta_in_ticks) {
2604
2605                                 slave->link = BOND_LINK_UP;
2606
2607                                 write_lock(&bond->curr_slave_lock);
2608
2609                                 if ((!bond->curr_active_slave) &&
2610                                     ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2611                                         bond_change_active_slave(bond, slave);
2612                                         bond->current_arp_slave = NULL;
2613                                 } else if (bond->curr_active_slave != slave) {
2614                                         /* this slave has just come up but we
2615                                          * already have a current slave; this
2616                                          * can also happen if bond_enslave adds
2617                                          * a new slave that is up while we are
2618                                          * searching for a new slave
2619                                          */
2620                                         bond_set_slave_inactive_flags(slave);
2621                                         bond->current_arp_slave = NULL;
2622                                 }
2623
2624                                 bond_set_carrier(bond);
2625
2626                                 if (slave == bond->curr_active_slave) {
2627                                         printk(KERN_INFO DRV_NAME
2628                                                ": %s: %s is up and now the "
2629                                                "active interface\n",
2630                                                bond_dev->name,
2631                                                slave->dev->name);
2632                                         netif_carrier_on(bond->dev);
2633                                 } else {
2634                                         printk(KERN_INFO DRV_NAME
2635                                                ": %s: backup interface %s is "
2636                                                "now up\n",
2637                                                bond_dev->name,
2638                                                slave->dev->name);
2639                                 }
2640
2641                                 write_unlock(&bond->curr_slave_lock);
2642                         }
2643                 } else {
2644                         read_lock(&bond->curr_slave_lock);
2645
2646                         if ((slave != bond->curr_active_slave) &&
2647                             (!bond->current_arp_slave) &&
2648                             (((jiffies - slave->dev->last_rx) >= 3*delta_in_ticks) &&
2649                              bond_has_ip(bond))) {
2650                                 /* a backup slave has gone down; three times
2651                                  * the delta allows the current slave to be
2652                                  * taken out before the backup slave.
2653                                  * note: a non-null current_arp_slave indicates
2654                                  * the curr_active_slave went down and we are
2655                                  * searching for a new one; under this
2656                                  * condition we only take the curr_active_slave
2657                                  * down - this gives each slave a chance to
2658                                  * tx/rx traffic before being taken out
2659                                  */
2660
2661                                 read_unlock(&bond->curr_slave_lock);
2662
2663                                 slave->link  = BOND_LINK_DOWN;
2664
2665                                 if (slave->link_failure_count < UINT_MAX) {
2666                                         slave->link_failure_count++;
2667                                 }
2668
2669                                 bond_set_slave_inactive_flags(slave);
2670
2671                                 printk(KERN_INFO DRV_NAME
2672                                        ": %s: backup interface %s is now down\n",
2673                                        bond_dev->name,
2674                                        slave->dev->name);
2675                         } else {
2676                                 read_unlock(&bond->curr_slave_lock);
2677                         }
2678                 }
2679         }
2680
2681         read_lock(&bond->curr_slave_lock);
2682         slave = bond->curr_active_slave;
2683         read_unlock(&bond->curr_slave_lock);
2684
2685         if (slave) {
2686                 /* if we have sent traffic in the past 2*arp_intervals but
2687                  * haven't xmit and rx traffic in that time interval, select
2688                  * a different slave. slave->jiffies is only updated when
2689                  * a slave first becomes the curr_active_slave - not necessarily
2690                  * after every arp; this ensures the slave has a full 2*delta
2691                  * before being taken out. if a primary is being used, check
2692                  * if it is up and needs to take over as the curr_active_slave
2693                  */
2694                 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2695             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2696              bond_has_ip(bond))) &&
2697                     ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2698
2699                         slave->link  = BOND_LINK_DOWN;
2700
2701                         if (slave->link_failure_count < UINT_MAX) {
2702                                 slave->link_failure_count++;
2703                         }
2704
2705                         printk(KERN_INFO DRV_NAME
2706                                ": %s: link status down for active interface "
2707                                "%s, disabling it\n",
2708                                bond_dev->name,
2709                                slave->dev->name);
2710
2711                         write_lock(&bond->curr_slave_lock);
2712
2713                         bond_select_active_slave(bond);
2714                         slave = bond->curr_active_slave;
2715
2716                         write_unlock(&bond->curr_slave_lock);
2717
2718                         bond->current_arp_slave = slave;
2719
2720                         if (slave) {
2721                                 slave->jiffies = jiffies;
2722                         }
2723                 } else if ((bond->primary_slave) &&
2724                            (bond->primary_slave != slave) &&
2725                            (bond->primary_slave->link == BOND_LINK_UP)) {
2726                         /* at this point, slave is the curr_active_slave */
2727                         printk(KERN_INFO DRV_NAME
2728                                ": %s: changing from interface %s to primary "
2729                                "interface %s\n",
2730                                bond_dev->name,
2731                                slave->dev->name,
2732                                bond->primary_slave->dev->name);
2733
2734                         /* primary is up so switch to it */
2735                         write_lock(&bond->curr_slave_lock);
2736                         bond_change_active_slave(bond, bond->primary_slave);
2737                         write_unlock(&bond->curr_slave_lock);
2738
2739                         slave = bond->primary_slave;
2740                         slave->jiffies = jiffies;
2741                 } else {
2742                         bond->current_arp_slave = NULL;
2743                 }
2744
2745                 /* the current slave must tx an arp to ensure backup slaves
2746                  * rx traffic
2747                  */
2748                 if (slave && bond_has_ip(bond)) {
2749                         bond_arp_send_all(bond, slave);
2750                 }
2751         }
2752
2753         /* if we don't have a curr_active_slave, search for the next available
2754          * backup slave from the current_arp_slave and make it the candidate
2755          * for becoming the curr_active_slave
2756          */
2757         if (!slave) {
2758                 if (!bond->current_arp_slave) {
2759                         bond->current_arp_slave = bond->first_slave;
2760                 }
2761
2762                 if (bond->current_arp_slave) {
2763                         bond_set_slave_inactive_flags(bond->current_arp_slave);
2764
2765                         /* search for next candidate */
2766                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2767                                 if (IS_UP(slave->dev)) {
2768                                         slave->link = BOND_LINK_BACK;
2769                                         bond_set_slave_active_flags(slave);
2770                                         bond_arp_send_all(bond, slave);
2771                                         slave->jiffies = jiffies;
2772                                         bond->current_arp_slave = slave;
2773                                         break;
2774                                 }
2775
2776                                 /* if the link state is up at this point, we
2777                                  * mark it down - this can happen if we have
2778                                  * simultaneous link failures and
2779                                  * reselect_active_interface doesn't make this
2780                                  * one the current slave so it is still marked
2781                                  * up when it is actually down
2782                                  */
2783                                 if (slave->link == BOND_LINK_UP) {
2784                                         slave->link  = BOND_LINK_DOWN;
2785                                         if (slave->link_failure_count < UINT_MAX) {
2786                                                 slave->link_failure_count++;
2787                                         }
2788
2789                                         bond_set_slave_inactive_flags(slave);
2790
2791                                         printk(KERN_INFO DRV_NAME
2792                                                ": %s: backup interface %s is "
2793                                                "now down.\n",
2794                                                bond_dev->name,
2795                                                slave->dev->name);
2796                                 }
2797                         }
2798                 }
2799         }
2800
2801 re_arm:
2802         if (bond->params.arp_interval) {
2803                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2804         }
2805 out:
2806         read_unlock(&bond->lock);
2807 }
2808
2809 /*------------------------------ proc/seq_file-------------------------------*/
2810
2811 #ifdef CONFIG_PROC_FS
2812
2813 #define SEQ_START_TOKEN ((void *)1)
2814
2815 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2816 {
2817         struct bonding *bond = seq->private;
2818         loff_t off = 0;
2819         struct slave *slave;
2820         int i;
2821
2822         /* make sure the bond won't be taken away */
2823         read_lock(&dev_base_lock);
2824         read_lock_bh(&bond->lock);
2825
2826         if (*pos == 0) {
2827                 return SEQ_START_TOKEN;
2828         }
2829
2830         bond_for_each_slave(bond, slave, i) {
2831                 if (++off == *pos) {
2832                         return slave;
2833                 }
2834         }
2835
2836         return NULL;
2837 }
2838
2839 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2840 {
2841         struct bonding *bond = seq->private;
2842         struct slave *slave = v;
2843
2844         ++*pos;
2845         if (v == SEQ_START_TOKEN) {
2846                 return bond->first_slave;
2847         }
2848
2849         slave = slave->next;
2850
2851         return (slave == bond->first_slave) ? NULL : slave;
2852 }
2853
2854 static void bond_info_seq_stop(struct seq_file *seq, void *v)
2855 {
2856         struct bonding *bond = seq->private;
2857
2858         read_unlock_bh(&bond->lock);
2859         read_unlock(&dev_base_lock);
2860 }
2861
2862 static void bond_info_show_master(struct seq_file *seq)
2863 {
2864         struct bonding *bond = seq->private;
2865         struct slave *curr;
2866         int i;
2867         u32 target;
2868
2869         read_lock(&bond->curr_slave_lock);
2870         curr = bond->curr_active_slave;
2871         read_unlock(&bond->curr_slave_lock);
2872
2873         seq_printf(seq, "Bonding Mode: %s\n",
2874                    bond_mode_name(bond->params.mode));
2875
2876         if (bond->params.mode == BOND_MODE_XOR ||
2877                 bond->params.mode == BOND_MODE_8023AD) {
2878                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2879                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2880                         bond->params.xmit_policy);
2881         }
2882
2883         if (USES_PRIMARY(bond->params.mode)) {
2884                 seq_printf(seq, "Primary Slave: %s\n",
2885                            (bond->primary_slave) ?
2886                            bond->primary_slave->dev->name : "None");
2887
2888                 seq_printf(seq, "Currently Active Slave: %s\n",
2889                            (curr) ? curr->dev->name : "None");
2890         }
2891
2892         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
2893                    "up" : "down");
2894         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
2895         seq_printf(seq, "Up Delay (ms): %d\n",
2896                    bond->params.updelay * bond->params.miimon);
2897         seq_printf(seq, "Down Delay (ms): %d\n",
2898                    bond->params.downdelay * bond->params.miimon);
2899
2900
2901         /* ARP information */
2902         if(bond->params.arp_interval > 0) {
2903                 int printed=0;
2904                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
2905                                 bond->params.arp_interval);
2906
2907                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
2908
2909                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
2910                         if (!bond->params.arp_targets[i])
2911                                 continue;
2912                         if (printed)
2913                                 seq_printf(seq, ",");
2914                         target = ntohl(bond->params.arp_targets[i]);
2915                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
2916                         printed = 1;
2917                 }
2918                 seq_printf(seq, "\n");
2919         }
2920
2921         if (bond->params.mode == BOND_MODE_8023AD) {
2922                 struct ad_info ad_info;
2923
2924                 seq_puts(seq, "\n802.3ad info\n");
2925                 seq_printf(seq, "LACP rate: %s\n",
2926                            (bond->params.lacp_fast) ? "fast" : "slow");
2927
2928                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2929                         seq_printf(seq, "bond %s has no active aggregator\n",
2930                                    bond->dev->name);
2931                 } else {
2932                         seq_printf(seq, "Active Aggregator Info:\n");
2933
2934                         seq_printf(seq, "\tAggregator ID: %d\n",
2935                                    ad_info.aggregator_id);
2936                         seq_printf(seq, "\tNumber of ports: %d\n",
2937                                    ad_info.ports);
2938                         seq_printf(seq, "\tActor Key: %d\n",
2939                                    ad_info.actor_key);
2940                         seq_printf(seq, "\tPartner Key: %d\n",
2941                                    ad_info.partner_key);
2942                         seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
2943                                    ad_info.partner_system[0],
2944                                    ad_info.partner_system[1],
2945                                    ad_info.partner_system[2],
2946                                    ad_info.partner_system[3],
2947                                    ad_info.partner_system[4],
2948                                    ad_info.partner_system[5]);
2949                 }
2950         }
2951 }
2952
2953 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
2954 {
2955         struct bonding *bond = seq->private;
2956
2957         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
2958         seq_printf(seq, "MII Status: %s\n",
2959                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
2960         seq_printf(seq, "Link Failure Count: %u\n",
2961                    slave->link_failure_count);
2962
2963         seq_printf(seq,
2964                    "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
2965                    slave->perm_hwaddr[0], slave->perm_hwaddr[1],
2966                    slave->perm_hwaddr[2], slave->perm_hwaddr[3],
2967                    slave->perm_hwaddr[4], slave->perm_hwaddr[5]);
2968
2969         if (bond->params.mode == BOND_MODE_8023AD) {
2970                 const struct aggregator *agg
2971                         = SLAVE_AD_INFO(slave).port.aggregator;
2972
2973                 if (agg) {
2974                         seq_printf(seq, "Aggregator ID: %d\n",
2975                                    agg->aggregator_identifier);
2976                 } else {
2977                         seq_puts(seq, "Aggregator ID: N/A\n");
2978                 }
2979         }
2980 }
2981
2982 static int bond_info_seq_show(struct seq_file *seq, void *v)
2983 {
2984         if (v == SEQ_START_TOKEN) {
2985                 seq_printf(seq, "%s\n", version);
2986                 bond_info_show_master(seq);
2987         } else {
2988                 bond_info_show_slave(seq, v);
2989         }
2990
2991         return 0;
2992 }
2993
2994 static struct seq_operations bond_info_seq_ops = {
2995         .start = bond_info_seq_start,
2996         .next  = bond_info_seq_next,
2997         .stop  = bond_info_seq_stop,
2998         .show  = bond_info_seq_show,
2999 };
3000
3001 static int bond_info_open(struct inode *inode, struct file *file)
3002 {
3003         struct seq_file *seq;
3004         struct proc_dir_entry *proc;
3005         int res;
3006
3007         res = seq_open(file, &bond_info_seq_ops);
3008         if (!res) {
3009                 /* recover the pointer buried in proc_dir_entry data */
3010                 seq = file->private_data;
3011                 proc = PDE(inode);
3012                 seq->private = proc->data;
3013         }
3014
3015         return res;
3016 }
3017
3018 static struct file_operations bond_info_fops = {
3019         .owner   = THIS_MODULE,
3020         .open    = bond_info_open,
3021         .read    = seq_read,
3022         .llseek  = seq_lseek,
3023         .release = seq_release,
3024 };
3025
3026 static int bond_create_proc_entry(struct bonding *bond)
3027 {
3028         struct net_device *bond_dev = bond->dev;
3029
3030         if (bond_proc_dir) {
3031                 bond->proc_entry = create_proc_entry(bond_dev->name,
3032                                                      S_IRUGO,
3033                                                      bond_proc_dir);
3034                 if (bond->proc_entry == NULL) {
3035                         printk(KERN_WARNING DRV_NAME
3036                                ": Warning: Cannot create /proc/net/%s/%s\n",
3037                                DRV_NAME, bond_dev->name);
3038                 } else {
3039                         bond->proc_entry->data = bond;
3040                         bond->proc_entry->proc_fops = &bond_info_fops;
3041                         bond->proc_entry->owner = THIS_MODULE;
3042                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3043                 }
3044         }
3045
3046         return 0;
3047 }
3048
3049 static void bond_remove_proc_entry(struct bonding *bond)
3050 {
3051         if (bond_proc_dir && bond->proc_entry) {
3052                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3053                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3054                 bond->proc_entry = NULL;
3055         }
3056 }
3057
3058 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3059  * Caller must hold rtnl_lock.
3060  */
3061 static void bond_create_proc_dir(void)
3062 {
3063         int len = strlen(DRV_NAME);
3064
3065         for (bond_proc_dir = proc_net->subdir; bond_proc_dir;
3066              bond_proc_dir = bond_proc_dir->next) {
3067                 if ((bond_proc_dir->namelen == len) &&
3068                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3069                         break;
3070                 }
3071         }
3072
3073         if (!bond_proc_dir) {
3074                 bond_proc_dir = proc_mkdir(DRV_NAME, proc_net);
3075                 if (bond_proc_dir) {
3076                         bond_proc_dir->owner = THIS_MODULE;
3077                 } else {
3078                         printk(KERN_WARNING DRV_NAME
3079                                 ": Warning: cannot create /proc/net/%s\n",
3080                                 DRV_NAME);
3081                 }
3082         }
3083 }
3084
3085 /* Destroy the bonding directory under /proc/net, if empty.
3086  * Caller must hold rtnl_lock.
3087  */
3088 static void bond_destroy_proc_dir(void)
3089 {
3090         struct proc_dir_entry *de;
3091
3092         if (!bond_proc_dir) {
3093                 return;
3094         }
3095
3096         /* verify that the /proc dir is empty */
3097         for (de = bond_proc_dir->subdir; de; de = de->next) {
3098                 /* ignore . and .. */
3099                 if (*(de->name) != '.') {
3100                         break;
3101                 }
3102         }
3103
3104         if (de) {
3105                 if (bond_proc_dir->owner == THIS_MODULE) {
3106                         bond_proc_dir->owner = NULL;
3107                 }
3108         } else {
3109                 remove_proc_entry(DRV_NAME, proc_net);
3110                 bond_proc_dir = NULL;
3111         }
3112 }
3113 #endif /* CONFIG_PROC_FS */
3114
3115 /*-------------------------- netdev event handling --------------------------*/
3116
3117 /*
3118  * Change device name
3119  */
3120 static int bond_event_changename(struct bonding *bond)
3121 {
3122 #ifdef CONFIG_PROC_FS
3123         bond_remove_proc_entry(bond);
3124         bond_create_proc_entry(bond);
3125 #endif
3126         down_write(&(bonding_rwsem));
3127         bond_destroy_sysfs_entry(bond);
3128         bond_create_sysfs_entry(bond);
3129         up_write(&(bonding_rwsem));
3130         return NOTIFY_DONE;
3131 }
3132
3133 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3134 {
3135         struct bonding *event_bond = bond_dev->priv;
3136
3137         switch (event) {
3138         case NETDEV_CHANGENAME:
3139                 return bond_event_changename(event_bond);
3140         case NETDEV_UNREGISTER:
3141                 /*
3142                  * TODO: remove a bond from the list?
3143                  */
3144                 break;
3145         default:
3146                 break;
3147         }
3148
3149         return NOTIFY_DONE;
3150 }
3151
3152 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3153 {
3154         struct net_device *bond_dev = slave_dev->master;
3155         struct bonding *bond = bond_dev->priv;
3156
3157         switch (event) {
3158         case NETDEV_UNREGISTER:
3159                 if (bond_dev) {
3160                         bond_release(bond_dev, slave_dev);
3161                 }
3162                 break;
3163         case NETDEV_CHANGE:
3164                 /*
3165                  * TODO: is this what we get if somebody
3166                  * sets up a hierarchical bond, then rmmod's
3167                  * one of the slave bonding devices?
3168                  */
3169                 break;
3170         case NETDEV_DOWN:
3171                 /*
3172                  * ... Or is it this?
3173                  */
3174                 break;
3175         case NETDEV_CHANGEMTU:
3176                 /*
3177                  * TODO: Should slaves be allowed to
3178                  * independently alter their MTU?  For
3179                  * an active-backup bond, slaves need
3180                  * not be the same type of device, so
3181                  * MTUs may vary.  For other modes,
3182                  * slaves arguably should have the
3183                  * same MTUs. To do this, we'd need to
3184                  * take over the slave's change_mtu
3185                  * function for the duration of their
3186                  * servitude.
3187                  */
3188                 break;
3189         case NETDEV_CHANGENAME:
3190                 /*
3191                  * TODO: handle changing the primary's name
3192                  */
3193                 break;
3194         case NETDEV_FEAT_CHANGE:
3195                 bond_compute_features(bond);
3196                 break;
3197         default:
3198                 break;
3199         }
3200
3201         return NOTIFY_DONE;
3202 }
3203
3204 /*
3205  * bond_netdev_event: handle netdev notifier chain events.
3206  *
3207  * This function receives events for the netdev chain.  The caller (an
3208  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3209  * locks for us to safely manipulate the slave devices (RTNL lock,
3210  * dev_probe_lock).
3211  */
3212 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3213 {
3214         struct net_device *event_dev = (struct net_device *)ptr;
3215
3216         dprintk("event_dev: %s, event: %lx\n",
3217                 (event_dev ? event_dev->name : "None"),
3218                 event);
3219
3220         if (!(event_dev->priv_flags & IFF_BONDING))
3221                 return NOTIFY_DONE;
3222
3223         if (event_dev->flags & IFF_MASTER) {
3224                 dprintk("IFF_MASTER\n");
3225                 return bond_master_netdev_event(event, event_dev);
3226         }
3227
3228         if (event_dev->flags & IFF_SLAVE) {
3229                 dprintk("IFF_SLAVE\n");
3230                 return bond_slave_netdev_event(event, event_dev);
3231         }
3232
3233         return NOTIFY_DONE;
3234 }
3235
3236 /*
3237  * bond_inetaddr_event: handle inetaddr notifier chain events.
3238  *
3239  * We keep track of device IPs primarily to use as source addresses in
3240  * ARP monitor probes (rather than spewing out broadcasts all the time).
3241  *
3242  * We track one IP for the main device (if it has one), plus one per VLAN.
3243  */
3244 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3245 {
3246         struct in_ifaddr *ifa = ptr;
3247         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3248         struct bonding *bond, *bond_next;
3249         struct vlan_entry *vlan, *vlan_next;
3250
3251         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3252                 if (bond->dev == event_dev) {
3253                         switch (event) {
3254                         case NETDEV_UP:
3255                                 bond->master_ip = ifa->ifa_local;
3256                                 return NOTIFY_OK;
3257                         case NETDEV_DOWN:
3258                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3259                                 return NOTIFY_OK;
3260                         default:
3261                                 return NOTIFY_DONE;
3262                         }
3263                 }
3264
3265                 if (list_empty(&bond->vlan_list))
3266                         continue;
3267
3268                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3269                                          vlan_list) {
3270                         vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
3271                         if (vlan_dev == event_dev) {
3272                                 switch (event) {
3273                                 case NETDEV_UP:
3274                                         vlan->vlan_ip = ifa->ifa_local;
3275                                         return NOTIFY_OK;
3276                                 case NETDEV_DOWN:
3277                                         vlan->vlan_ip =
3278                                                 bond_glean_dev_ip(vlan_dev);
3279                                         return NOTIFY_OK;
3280                                 default:
3281                                         return NOTIFY_DONE;
3282                                 }
3283                         }
3284                 }
3285         }
3286         return NOTIFY_DONE;
3287 }
3288
3289 static struct notifier_block bond_netdev_notifier = {
3290         .notifier_call = bond_netdev_event,
3291 };
3292
3293 static struct notifier_block bond_inetaddr_notifier = {
3294         .notifier_call = bond_inetaddr_event,
3295 };
3296
3297 /*-------------------------- Packet type handling ---------------------------*/
3298
3299 /* register to receive lacpdus on a bond */
3300 static void bond_register_lacpdu(struct bonding *bond)
3301 {
3302         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3303
3304         /* initialize packet type */
3305         pk_type->type = PKT_TYPE_LACPDU;
3306         pk_type->dev = bond->dev;
3307         pk_type->func = bond_3ad_lacpdu_recv;
3308
3309         dev_add_pack(pk_type);
3310 }
3311
3312 /* unregister to receive lacpdus on a bond */
3313 static void bond_unregister_lacpdu(struct bonding *bond)
3314 {
3315         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3316 }
3317
3318 /*---------------------------- Hashing Policies -----------------------------*/
3319
3320 /*
3321  * Hash for the the output device based upon layer 3 and layer 4 data. If
3322  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3323  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3324  */
3325 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3326                                     struct net_device *bond_dev, int count)
3327 {
3328         struct ethhdr *data = (struct ethhdr *)skb->data;
3329         struct iphdr *iph = skb->nh.iph;
3330         u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
3331         int layer4_xor = 0;
3332
3333         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3334                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3335                     (iph->protocol == IPPROTO_TCP ||
3336                      iph->protocol == IPPROTO_UDP)) {
3337                         layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
3338                 }
3339                 return (layer4_xor ^
3340                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3341
3342         }
3343
3344         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3345 }
3346
3347 /*
3348  * Hash for the output device based upon layer 2 data
3349  */
3350 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3351                                    struct net_device *bond_dev, int count)
3352 {
3353         struct ethhdr *data = (struct ethhdr *)skb->data;
3354
3355         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3356 }
3357
3358 /*-------------------------- Device entry points ----------------------------*/
3359
3360 static int bond_open(struct net_device *bond_dev)
3361 {
3362         struct bonding *bond = bond_dev->priv;
3363         struct timer_list *mii_timer = &bond->mii_timer;
3364         struct timer_list *arp_timer = &bond->arp_timer;
3365
3366         bond->kill_timers = 0;
3367
3368         if ((bond->params.mode == BOND_MODE_TLB) ||
3369             (bond->params.mode == BOND_MODE_ALB)) {
3370                 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3371
3372                 /* bond_alb_initialize must be called before the timer
3373                  * is started.
3374                  */
3375                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3376                         /* something went wrong - fail the open operation */
3377                         return -1;
3378                 }
3379
3380                 init_timer(alb_timer);
3381                 alb_timer->expires  = jiffies + 1;
3382                 alb_timer->data     = (unsigned long)bond;
3383                 alb_timer->function = (void *)&bond_alb_monitor;
3384                 add_timer(alb_timer);
3385         }
3386
3387         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3388                 init_timer(mii_timer);
3389                 mii_timer->expires  = jiffies + 1;
3390                 mii_timer->data     = (unsigned long)bond_dev;
3391                 mii_timer->function = (void *)&bond_mii_monitor;
3392                 add_timer(mii_timer);
3393         }
3394
3395         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3396                 init_timer(arp_timer);
3397                 arp_timer->expires  = jiffies + 1;
3398                 arp_timer->data     = (unsigned long)bond_dev;
3399                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3400                         arp_timer->function = (void *)&bond_activebackup_arp_mon;
3401                 } else {
3402                         arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3403                 }
3404                 add_timer(arp_timer);
3405         }
3406
3407         if (bond->params.mode == BOND_MODE_8023AD) {
3408                 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3409                 init_timer(ad_timer);
3410                 ad_timer->expires  = jiffies + 1;
3411                 ad_timer->data     = (unsigned long)bond;
3412                 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3413                 add_timer(ad_timer);
3414
3415                 /* register to receive LACPDUs */
3416                 bond_register_lacpdu(bond);
3417         }
3418
3419         return 0;
3420 }
3421
3422 static int bond_close(struct net_device *bond_dev)
3423 {
3424         struct bonding *bond = bond_dev->priv;
3425
3426         if (bond->params.mode == BOND_MODE_8023AD) {
3427                 /* Unregister the receive of LACPDUs */
3428                 bond_unregister_lacpdu(bond);
3429         }
3430
3431         write_lock_bh(&bond->lock);
3432
3433
3434         /* signal timers not to re-arm */
3435         bond->kill_timers = 1;
3436
3437         write_unlock_bh(&bond->lock);
3438
3439         /* del_timer_sync must run without holding the bond->lock
3440          * because a running timer might be trying to hold it too
3441          */
3442
3443         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3444                 del_timer_sync(&bond->mii_timer);
3445         }
3446
3447         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3448                 del_timer_sync(&bond->arp_timer);
3449         }
3450
3451         switch (bond->params.mode) {
3452         case BOND_MODE_8023AD:
3453                 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3454                 break;
3455         case BOND_MODE_TLB:
3456         case BOND_MODE_ALB:
3457                 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3458                 break;
3459         default:
3460                 break;
3461         }
3462
3463
3464         if ((bond->params.mode == BOND_MODE_TLB) ||
3465             (bond->params.mode == BOND_MODE_ALB)) {
3466                 /* Must be called only after all
3467                  * slaves have been released
3468                  */
3469                 bond_alb_deinitialize(bond);
3470         }
3471
3472         return 0;
3473 }
3474
3475 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3476 {
3477         struct bonding *bond = bond_dev->priv;
3478         struct net_device_stats *stats = &(bond->stats), *sstats;
3479         struct slave *slave;
3480         int i;
3481
3482         memset(stats, 0, sizeof(struct net_device_stats));
3483
3484         read_lock_bh(&bond->lock);
3485
3486         bond_for_each_slave(bond, slave, i) {
3487                 sstats = slave->dev->get_stats(slave->dev);
3488
3489                 stats->rx_packets += sstats->rx_packets;
3490                 stats->rx_bytes += sstats->rx_bytes;
3491                 stats->rx_errors += sstats->rx_errors;
3492                 stats->rx_dropped += sstats->rx_dropped;
3493
3494                 stats->tx_packets += sstats->tx_packets;
3495                 stats->tx_bytes += sstats->tx_bytes;
3496                 stats->tx_errors += sstats->tx_errors;
3497                 stats->tx_dropped += sstats->tx_dropped;
3498
3499                 stats->multicast += sstats->multicast;
3500                 stats->collisions += sstats->collisions;
3501
3502                 stats->rx_length_errors += sstats->rx_length_errors;
3503                 stats->rx_over_errors += sstats->rx_over_errors;
3504                 stats->rx_crc_errors += sstats->rx_crc_errors;
3505                 stats->rx_frame_errors += sstats->rx_frame_errors;
3506                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3507                 stats->rx_missed_errors += sstats->rx_missed_errors;
3508
3509                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3510                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3511                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3512                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3513                 stats->tx_window_errors += sstats->tx_window_errors;
3514         }
3515
3516         read_unlock_bh(&bond->lock);
3517
3518         return stats;
3519 }
3520
3521 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3522 {
3523         struct net_device *slave_dev = NULL;
3524         struct ifbond k_binfo;
3525         struct ifbond __user *u_binfo = NULL;
3526         struct ifslave k_sinfo;
3527         struct ifslave __user *u_sinfo = NULL;
3528         struct mii_ioctl_data *mii = NULL;
3529         int res = 0;
3530
3531         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3532                 bond_dev->name, cmd);
3533
3534         switch (cmd) {
3535         case SIOCGMIIPHY:
3536                 mii = if_mii(ifr);
3537                 if (!mii) {
3538                         return -EINVAL;
3539                 }
3540                 mii->phy_id = 0;
3541                 /* Fall Through */
3542         case SIOCGMIIREG:
3543                 /*
3544                  * We do this again just in case we were called by SIOCGMIIREG
3545                  * instead of SIOCGMIIPHY.
3546                  */
3547                 mii = if_mii(ifr);
3548                 if (!mii) {
3549                         return -EINVAL;
3550                 }
3551
3552                 if (mii->reg_num == 1) {
3553                         struct bonding *bond = bond_dev->priv;
3554                         mii->val_out = 0;
3555                         read_lock_bh(&bond->lock);
3556                         read_lock(&bond->curr_slave_lock);
3557                         if (bond->curr_active_slave) {
3558                                 mii->val_out = BMSR_LSTATUS;
3559                         }
3560                         read_unlock(&bond->curr_slave_lock);
3561                         read_unlock_bh(&bond->lock);
3562                 }
3563
3564                 return 0;
3565         case BOND_INFO_QUERY_OLD:
3566         case SIOCBONDINFOQUERY:
3567                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3568
3569                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3570                         return -EFAULT;
3571                 }
3572
3573                 res = bond_info_query(bond_dev, &k_binfo);
3574                 if (res == 0) {
3575                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3576                                 return -EFAULT;
3577                         }
3578                 }
3579
3580                 return res;
3581         case BOND_SLAVE_INFO_QUERY_OLD:
3582         case SIOCBONDSLAVEINFOQUERY:
3583                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3584
3585                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3586                         return -EFAULT;
3587                 }
3588
3589                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3590                 if (res == 0) {
3591                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3592                                 return -EFAULT;
3593                         }
3594                 }
3595
3596                 return res;
3597         default:
3598                 /* Go on */
3599                 break;
3600         }
3601
3602         if (!capable(CAP_NET_ADMIN)) {
3603                 return -EPERM;
3604         }
3605
3606         down_write(&(bonding_rwsem));
3607         slave_dev = dev_get_by_name(ifr->ifr_slave);
3608
3609         dprintk("slave_dev=%p: \n", slave_dev);
3610
3611         if (!slave_dev) {
3612                 res = -ENODEV;
3613         } else {
3614                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3615                 switch (cmd) {
3616                 case BOND_ENSLAVE_OLD:
3617                 case SIOCBONDENSLAVE:
3618                         res = bond_enslave(bond_dev, slave_dev);
3619                         break;
3620                 case BOND_RELEASE_OLD:
3621                 case SIOCBONDRELEASE:
3622                         res = bond_release(bond_dev, slave_dev);
3623                         break;
3624                 case BOND_SETHWADDR_OLD:
3625                 case SIOCBONDSETHWADDR:
3626                         res = bond_sethwaddr(bond_dev, slave_dev);
3627                         break;
3628                 case BOND_CHANGE_ACTIVE_OLD:
3629                 case SIOCBONDCHANGEACTIVE:
3630                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3631                         break;
3632                 default:
3633                         res = -EOPNOTSUPP;
3634                 }
3635
3636                 dev_put(slave_dev);
3637         }
3638
3639         up_write(&(bonding_rwsem));
3640         return res;
3641 }
3642
3643 static void bond_set_multicast_list(struct net_device *bond_dev)
3644 {
3645         struct bonding *bond = bond_dev->priv;
3646         struct dev_mc_list *dmi;
3647
3648         write_lock_bh(&bond->lock);
3649
3650         /*
3651          * Do promisc before checking multicast_mode
3652          */
3653         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3654                 bond_set_promiscuity(bond, 1);
3655         }
3656
3657         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3658                 bond_set_promiscuity(bond, -1);
3659         }
3660
3661         /* set allmulti flag to slaves */
3662         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3663                 bond_set_allmulti(bond, 1);
3664         }
3665
3666         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3667                 bond_set_allmulti(bond, -1);
3668         }
3669
3670         bond->flags = bond_dev->flags;
3671
3672         /* looking for addresses to add to slaves' mc list */
3673         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3674                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3675                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3676                 }
3677         }
3678
3679         /* looking for addresses to delete from slaves' list */
3680         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3681                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3682                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3683                 }
3684         }
3685
3686         /* save master's multicast list */
3687         bond_mc_list_destroy(bond);
3688         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3689
3690         write_unlock_bh(&bond->lock);
3691 }
3692
3693 /*
3694  * Change the MTU of all of a master's slaves to match the master
3695  */
3696 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3697 {
3698         struct bonding *bond = bond_dev->priv;
3699         struct slave *slave, *stop_at;
3700         int res = 0;
3701         int i;
3702
3703         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3704                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3705
3706         /* Can't hold bond->lock with bh disabled here since
3707          * some base drivers panic. On the other hand we can't
3708          * hold bond->lock without bh disabled because we'll
3709          * deadlock. The only solution is to rely on the fact
3710          * that we're under rtnl_lock here, and the slaves
3711          * list won't change. This doesn't solve the problem
3712          * of setting the slave's MTU while it is
3713          * transmitting, but the assumption is that the base
3714          * driver can handle that.
3715          *
3716          * TODO: figure out a way to safely iterate the slaves
3717          * list, but without holding a lock around the actual
3718          * call to the base driver.
3719          */
3720
3721         bond_for_each_slave(bond, slave, i) {
3722                 dprintk("s %p s->p %p c_m %p\n", slave,
3723                         slave->prev, slave->dev->change_mtu);
3724
3725                 res = dev_set_mtu(slave->dev, new_mtu);
3726
3727                 if (res) {
3728                         /* If we failed to set the slave's mtu to the new value
3729                          * we must abort the operation even in ACTIVE_BACKUP
3730                          * mode, because if we allow the backup slaves to have
3731                          * different mtu values than the active slave we'll
3732                          * need to change their mtu when doing a failover. That
3733                          * means changing their mtu from timer context, which
3734                          * is probably not a good idea.
3735                          */
3736                         dprintk("err %d %s\n", res, slave->dev->name);
3737                         goto unwind;
3738                 }
3739         }
3740
3741         bond_dev->mtu = new_mtu;
3742
3743         return 0;
3744
3745 unwind:
3746         /* unwind from head to the slave that failed */
3747         stop_at = slave;
3748         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3749                 int tmp_res;
3750
3751                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3752                 if (tmp_res) {
3753                         dprintk("unwind err %d dev %s\n", tmp_res,
3754                                 slave->dev->name);
3755                 }
3756         }
3757
3758         return res;
3759 }
3760
3761 /*
3762  * Change HW address
3763  *
3764  * Note that many devices must be down to change the HW address, and
3765  * downing the master releases all slaves.  We can make bonds full of
3766  * bonding devices to test this, however.
3767  */
3768 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3769 {
3770         struct bonding *bond = bond_dev->priv;
3771         struct sockaddr *sa = addr, tmp_sa;
3772         struct slave *slave, *stop_at;
3773         int res = 0;
3774         int i;
3775
3776         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3777
3778         if (!is_valid_ether_addr(sa->sa_data)) {
3779                 return -EADDRNOTAVAIL;
3780         }
3781
3782         /* Can't hold bond->lock with bh disabled here since
3783          * some base drivers panic. On the other hand we can't
3784          * hold bond->lock without bh disabled because we'll
3785          * deadlock. The only solution is to rely on the fact
3786          * that we're under rtnl_lock here, and the slaves
3787          * list won't change. This doesn't solve the problem
3788          * of setting the slave's hw address while it is
3789          * transmitting, but the assumption is that the base
3790          * driver can handle that.
3791          *
3792          * TODO: figure out a way to safely iterate the slaves
3793          * list, but without holding a lock around the actual
3794          * call to the base driver.
3795          */
3796
3797         bond_for_each_slave(bond, slave, i) {
3798                 dprintk("slave %p %s\n", slave, slave->dev->name);
3799
3800                 if (slave->dev->set_mac_address == NULL) {
3801                         res = -EOPNOTSUPP;
3802                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3803                         goto unwind;
3804                 }
3805
3806                 res = dev_set_mac_address(slave->dev, addr);
3807                 if (res) {
3808                         /* TODO: consider downing the slave
3809                          * and retry ?
3810                          * User should expect communications
3811                          * breakage anyway until ARP finish
3812                          * updating, so...
3813                          */
3814                         dprintk("err %d %s\n", res, slave->dev->name);
3815                         goto unwind;
3816                 }
3817         }
3818
3819         /* success */
3820         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3821         return 0;
3822
3823 unwind:
3824         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3825         tmp_sa.sa_family = bond_dev->type;
3826
3827         /* unwind from head to the slave that failed */
3828         stop_at = slave;
3829         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3830                 int tmp_res;
3831
3832                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3833                 if (tmp_res) {
3834                         dprintk("unwind err %d dev %s\n", tmp_res,
3835                                 slave->dev->name);
3836                 }
3837         }
3838
3839         return res;
3840 }
3841
3842 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3843 {
3844         struct bonding *bond = bond_dev->priv;
3845         struct slave *slave, *start_at;
3846         int i;
3847         int res = 1;
3848
3849         read_lock(&bond->lock);
3850
3851         if (!BOND_IS_OK(bond)) {
3852                 goto out;
3853         }
3854
3855         read_lock(&bond->curr_slave_lock);
3856         slave = start_at = bond->curr_active_slave;
3857         read_unlock(&bond->curr_slave_lock);
3858
3859         if (!slave) {
3860                 goto out;
3861         }
3862
3863         bond_for_each_slave_from(bond, slave, i, start_at) {
3864                 if (IS_UP(slave->dev) &&
3865                     (slave->link == BOND_LINK_UP) &&
3866                     (slave->state == BOND_STATE_ACTIVE)) {
3867                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3868
3869                         write_lock(&bond->curr_slave_lock);
3870                         bond->curr_active_slave = slave->next;
3871                         write_unlock(&bond->curr_slave_lock);
3872
3873                         break;
3874                 }
3875         }
3876
3877
3878 out:
3879         if (res) {
3880                 /* no suitable interface, frame not sent */
3881                 dev_kfree_skb(skb);
3882         }
3883         read_unlock(&bond->lock);
3884         return 0;
3885 }
3886
3887 static void bond_activebackup_xmit_copy(struct sk_buff *skb,
3888                                         struct bonding *bond,
3889                                         struct slave *slave)
3890 {
3891         struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
3892         struct ethhdr *eth_data;
3893         u8 *hwaddr;
3894         int res;
3895
3896         if (!skb2) {
3897                 printk(KERN_ERR DRV_NAME ": Error: "
3898                        "bond_activebackup_xmit_copy(): skb_copy() failed\n");
3899                 return;
3900         }
3901
3902         skb2->mac.raw = (unsigned char *)skb2->data;
3903         eth_data = eth_hdr(skb2);
3904
3905         /* Pick an appropriate source MAC address
3906          *      -- use slave's perm MAC addr, unless used by bond
3907          *      -- otherwise, borrow active slave's perm MAC addr
3908          *         since that will not be used
3909          */
3910         hwaddr = slave->perm_hwaddr;
3911         if (!memcmp(eth_data->h_source, hwaddr, ETH_ALEN))
3912                 hwaddr = bond->curr_active_slave->perm_hwaddr;
3913
3914         /* Set source MAC address appropriately */
3915         memcpy(eth_data->h_source, hwaddr, ETH_ALEN);
3916
3917         res = bond_dev_queue_xmit(bond, skb2, slave->dev);
3918         if (res)
3919                 dev_kfree_skb(skb2);
3920
3921         return;
3922 }
3923
3924 /*
3925  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3926  * the bond has a usable interface.
3927  */
3928 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3929 {
3930         struct bonding *bond = bond_dev->priv;
3931         int res = 1;
3932
3933         read_lock(&bond->lock);
3934         read_lock(&bond->curr_slave_lock);
3935
3936         if (!BOND_IS_OK(bond)) {
3937                 goto out;
3938         }
3939
3940         if (!bond->curr_active_slave)
3941                 goto out;
3942
3943         /* Xmit IGMP frames on all slaves to ensure rapid fail-over
3944            for multicast traffic on snooping switches */
3945         if (skb->protocol == __constant_htons(ETH_P_IP) &&
3946             skb->nh.iph->protocol == IPPROTO_IGMP) {
3947                 struct slave *slave, *active_slave;
3948                 int i;
3949
3950                 active_slave = bond->curr_active_slave;
3951                 bond_for_each_slave_from_to(bond, slave, i, active_slave->next,
3952                                             active_slave->prev)
3953                         if (IS_UP(slave->dev) &&
3954                             (slave->link == BOND_LINK_UP))
3955                                 bond_activebackup_xmit_copy(skb, bond, slave);
3956         }
3957
3958         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
3959
3960 out:
3961         if (res) {
3962                 /* no suitable interface, frame not sent */
3963                 dev_kfree_skb(skb);
3964         }
3965         read_unlock(&bond->curr_slave_lock);
3966         read_unlock(&bond->lock);
3967         return 0;
3968 }
3969
3970 /*
3971  * In bond_xmit_xor() , we determine the output device by using a pre-
3972  * determined xmit_hash_policy(), If the selected device is not enabled,
3973  * find the next active slave.
3974  */
3975 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3976 {
3977         struct bonding *bond = bond_dev->priv;
3978         struct slave *slave, *start_at;
3979         int slave_no;
3980         int i;
3981         int res = 1;
3982
3983         read_lock(&bond->lock);
3984
3985         if (!BOND_IS_OK(bond)) {
3986                 goto out;
3987         }
3988
3989         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
3990
3991         bond_for_each_slave(bond, slave, i) {
3992                 slave_no--;
3993                 if (slave_no < 0) {
3994                         break;
3995                 }
3996         }
3997
3998         start_at = slave;
3999
4000         bond_for_each_slave_from(bond, slave, i, start_at) {
4001                 if (IS_UP(slave->dev) &&
4002                     (slave->link == BOND_LINK_UP) &&
4003                     (slave->state == BOND_STATE_ACTIVE)) {
4004                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4005                         break;
4006                 }
4007         }
4008
4009 out:
4010         if (res) {
4011                 /* no suitable interface, frame not sent */
4012                 dev_kfree_skb(skb);
4013         }
4014         read_unlock(&bond->lock);
4015         return 0;
4016 }
4017
4018 /*
4019  * in broadcast mode, we send everything to all usable interfaces.
4020  */
4021 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4022 {
4023         struct bonding *bond = bond_dev->priv;
4024         struct slave *slave, *start_at;
4025         struct net_device *tx_dev = NULL;
4026         int i;
4027         int res = 1;
4028
4029         read_lock(&bond->lock);
4030
4031         if (!BOND_IS_OK(bond)) {
4032                 goto out;
4033         }
4034
4035         read_lock(&bond->curr_slave_lock);
4036         start_at = bond->curr_active_slave;
4037         read_unlock(&bond->curr_slave_lock);
4038
4039         if (!start_at) {
4040                 goto out;
4041         }
4042
4043         bond_for_each_slave_from(bond, slave, i, start_at) {
4044                 if (IS_UP(slave->dev) &&
4045                     (slave->link == BOND_LINK_UP) &&
4046                     (slave->state == BOND_STATE_ACTIVE)) {
4047                         if (tx_dev) {
4048                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4049                                 if (!skb2) {
4050                                         printk(KERN_ERR DRV_NAME
4051                                                ": %s: Error: bond_xmit_broadcast(): "
4052                                                "skb_clone() failed\n",
4053                                                bond_dev->name);
4054                                         continue;
4055                                 }
4056
4057                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4058                                 if (res) {
4059                                         dev_kfree_skb(skb2);
4060                                         continue;
4061                                 }
4062                         }
4063                         tx_dev = slave->dev;
4064                 }
4065         }
4066
4067         if (tx_dev) {
4068                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4069         }
4070
4071 out:
4072         if (res) {
4073                 /* no suitable interface, frame not sent */
4074                 dev_kfree_skb(skb);
4075         }
4076         /* frame sent to all suitable interfaces */
4077         read_unlock(&bond->lock);
4078         return 0;
4079 }
4080
4081 /*------------------------- Device initialization ---------------------------*/
4082
4083 /*
4084  * set bond mode specific net device operations
4085  */
4086 void bond_set_mode_ops(struct bonding *bond, int mode)
4087 {
4088         struct net_device *bond_dev = bond->dev;
4089
4090         switch (mode) {
4091         case BOND_MODE_ROUNDROBIN:
4092                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4093                 break;
4094         case BOND_MODE_ACTIVEBACKUP:
4095                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4096                 break;
4097         case BOND_MODE_XOR:
4098                 bond_dev->hard_start_xmit = bond_xmit_xor;
4099                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4100                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4101                 else
4102                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4103                 break;
4104         case BOND_MODE_BROADCAST:
4105                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4106                 break;
4107         case BOND_MODE_8023AD:
4108                 bond_set_master_3ad_flags(bond);
4109                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4110                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4111                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4112                 else
4113                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4114                 break;
4115         case BOND_MODE_ALB:
4116                 bond_set_master_alb_flags(bond);
4117                 /* FALLTHRU */
4118         case BOND_MODE_TLB:
4119                 bond_dev->hard_start_xmit = bond_alb_xmit;
4120                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4121                 break;
4122         default:
4123                 /* Should never happen, mode already checked */
4124                 printk(KERN_ERR DRV_NAME
4125                        ": %s: Error: Unknown bonding mode %d\n",
4126                        bond_dev->name,
4127                        mode);
4128                 break;
4129         }
4130 }
4131
4132 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4133                                     struct ethtool_drvinfo *drvinfo)
4134 {
4135         strncpy(drvinfo->driver, DRV_NAME, 32);
4136         strncpy(drvinfo->version, DRV_VERSION, 32);
4137         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4138 }
4139
4140 static const struct ethtool_ops bond_ethtool_ops = {
4141         .get_tx_csum            = ethtool_op_get_tx_csum,
4142         .get_tso                = ethtool_op_get_tso,
4143         .get_ufo                = ethtool_op_get_ufo,
4144         .get_sg                 = ethtool_op_get_sg,
4145         .get_drvinfo            = bond_ethtool_get_drvinfo,
4146 };
4147
4148 /*
4149  * Does not allocate but creates a /proc entry.
4150  * Allowed to fail.
4151  */
4152 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4153 {
4154         struct bonding *bond = bond_dev->priv;
4155
4156         dprintk("Begin bond_init for %s\n", bond_dev->name);
4157
4158         /* initialize rwlocks */
4159         rwlock_init(&bond->lock);
4160         rwlock_init(&bond->curr_slave_lock);
4161
4162         bond->params = *params; /* copy params struct */
4163
4164         /* Initialize pointers */
4165         bond->first_slave = NULL;
4166         bond->curr_active_slave = NULL;
4167         bond->current_arp_slave = NULL;
4168         bond->primary_slave = NULL;
4169         bond->dev = bond_dev;
4170         INIT_LIST_HEAD(&bond->vlan_list);
4171
4172         /* Initialize the device entry points */
4173         bond_dev->open = bond_open;
4174         bond_dev->stop = bond_close;
4175         bond_dev->get_stats = bond_get_stats;
4176         bond_dev->do_ioctl = bond_do_ioctl;
4177         bond_dev->ethtool_ops = &bond_ethtool_ops;
4178         bond_dev->set_multicast_list = bond_set_multicast_list;
4179         bond_dev->change_mtu = bond_change_mtu;
4180         bond_dev->set_mac_address = bond_set_mac_address;
4181
4182         bond_set_mode_ops(bond, bond->params.mode);
4183
4184         bond_dev->destructor = free_netdev;
4185
4186         /* Initialize the device options */
4187         bond_dev->tx_queue_len = 0;
4188         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4189         bond_dev->priv_flags |= IFF_BONDING;
4190
4191         /* At first, we block adding VLANs. That's the only way to
4192          * prevent problems that occur when adding VLANs over an
4193          * empty bond. The block will be removed once non-challenged
4194          * slaves are enslaved.
4195          */
4196         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4197
4198         /* don't acquire bond device's netif_tx_lock when
4199          * transmitting */
4200         bond_dev->features |= NETIF_F_LLTX;
4201
4202         /* By default, we declare the bond to be fully
4203          * VLAN hardware accelerated capable. Special
4204          * care is taken in the various xmit functions
4205          * when there are slaves that are not hw accel
4206          * capable
4207          */
4208         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4209         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4210         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4211         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4212                                NETIF_F_HW_VLAN_RX |
4213                                NETIF_F_HW_VLAN_FILTER);
4214
4215 #ifdef CONFIG_PROC_FS
4216         bond_create_proc_entry(bond);
4217 #endif
4218
4219         list_add_tail(&bond->bond_list, &bond_dev_list);
4220
4221         return 0;
4222 }
4223
4224 /* De-initialize device specific data.
4225  * Caller must hold rtnl_lock.
4226  */
4227 void bond_deinit(struct net_device *bond_dev)
4228 {
4229         struct bonding *bond = bond_dev->priv;
4230
4231         list_del(&bond->bond_list);
4232
4233 #ifdef CONFIG_PROC_FS
4234         bond_remove_proc_entry(bond);
4235 #endif
4236 }
4237
4238 /* Unregister and free all bond devices.
4239  * Caller must hold rtnl_lock.
4240  */
4241 static void bond_free_all(void)
4242 {
4243         struct bonding *bond, *nxt;
4244
4245         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4246                 struct net_device *bond_dev = bond->dev;
4247
4248                 bond_mc_list_destroy(bond);
4249                 /* Release the bonded slaves */
4250                 bond_release_all(bond_dev);
4251                 unregister_netdevice(bond_dev);
4252                 bond_deinit(bond_dev);
4253         }
4254
4255 #ifdef CONFIG_PROC_FS
4256         bond_destroy_proc_dir();
4257 #endif
4258 }
4259
4260 /*------------------------- Module initialization ---------------------------*/
4261
4262 /*
4263  * Convert string input module parms.  Accept either the
4264  * number of the mode or its string name.
4265  */
4266 int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
4267 {
4268         int i;
4269
4270         for (i = 0; tbl[i].modename; i++) {
4271                 if ((isdigit(*mode_arg) &&
4272                      tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4273                     (strncmp(mode_arg, tbl[i].modename,
4274                              strlen(tbl[i].modename)) == 0)) {
4275                         return tbl[i].mode;
4276                 }
4277         }
4278
4279         return -1;
4280 }
4281
4282 static int bond_check_params(struct bond_params *params)
4283 {
4284         /*
4285          * Convert string parameters.
4286          */
4287         if (mode) {
4288                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4289                 if (bond_mode == -1) {
4290                         printk(KERN_ERR DRV_NAME
4291                                ": Error: Invalid bonding mode \"%s\"\n",
4292                                mode == NULL ? "NULL" : mode);
4293                         return -EINVAL;
4294                 }
4295         }
4296
4297         if (xmit_hash_policy) {
4298                 if ((bond_mode != BOND_MODE_XOR) &&
4299                     (bond_mode != BOND_MODE_8023AD)) {
4300                         printk(KERN_INFO DRV_NAME
4301                                ": xor_mode param is irrelevant in mode %s\n",
4302                                bond_mode_name(bond_mode));
4303                 } else {
4304                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4305                                                         xmit_hashtype_tbl);
4306                         if (xmit_hashtype == -1) {
4307                                 printk(KERN_ERR DRV_NAME
4308                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4309                                 xmit_hash_policy == NULL ? "NULL" :
4310                                        xmit_hash_policy);
4311                                 return -EINVAL;
4312                         }
4313                 }
4314         }
4315
4316         if (lacp_rate) {
4317                 if (bond_mode != BOND_MODE_8023AD) {
4318                         printk(KERN_INFO DRV_NAME
4319                                ": lacp_rate param is irrelevant in mode %s\n",
4320                                bond_mode_name(bond_mode));
4321                 } else {
4322                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4323                         if (lacp_fast == -1) {
4324                                 printk(KERN_ERR DRV_NAME
4325                                        ": Error: Invalid lacp rate \"%s\"\n",
4326                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4327                                 return -EINVAL;
4328                         }
4329                 }
4330         }
4331
4332         if (max_bonds < 1 || max_bonds > INT_MAX) {
4333                 printk(KERN_WARNING DRV_NAME
4334                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4335                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4336                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4337                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4338         }
4339
4340         if (miimon < 0) {
4341                 printk(KERN_WARNING DRV_NAME
4342                        ": Warning: miimon module parameter (%d), "
4343                        "not in range 0-%d, so it was reset to %d\n",
4344                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4345                 miimon = BOND_LINK_MON_INTERV;
4346         }
4347
4348         if (updelay < 0) {
4349                 printk(KERN_WARNING DRV_NAME
4350                        ": Warning: updelay module parameter (%d), "
4351                        "not in range 0-%d, so it was reset to 0\n",
4352                        updelay, INT_MAX);
4353                 updelay = 0;
4354         }
4355
4356         if (downdelay < 0) {
4357                 printk(KERN_WARNING DRV_NAME
4358                        ": Warning: downdelay module parameter (%d), "
4359                        "not in range 0-%d, so it was reset to 0\n",
4360                        downdelay, INT_MAX);
4361                 downdelay = 0;
4362         }
4363
4364         if ((use_carrier != 0) && (use_carrier != 1)) {
4365                 printk(KERN_WARNING DRV_NAME
4366                        ": Warning: use_carrier module parameter (%d), "
4367                        "not of valid value (0/1), so it was set to 1\n",
4368                        use_carrier);
4369                 use_carrier = 1;
4370         }
4371
4372         /* reset values for 802.3ad */
4373         if (bond_mode == BOND_MODE_8023AD) {
4374                 if (!miimon) {
4375                         printk(KERN_WARNING DRV_NAME
4376                                ": Warning: miimon must be specified, "
4377                                "otherwise bonding will not detect link "
4378                                "failure, speed and duplex which are "
4379                                "essential for 802.3ad operation\n");
4380                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4381                         miimon = 100;
4382                 }
4383         }
4384
4385         /* reset values for TLB/ALB */
4386         if ((bond_mode == BOND_MODE_TLB) ||
4387             (bond_mode == BOND_MODE_ALB)) {
4388                 if (!miimon) {
4389                         printk(KERN_WARNING DRV_NAME
4390                                ": Warning: miimon must be specified, "
4391                                "otherwise bonding will not detect link "
4392                                "failure and link speed which are essential "
4393                                "for TLB/ALB load balancing\n");
4394                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4395                         miimon = 100;
4396                 }
4397         }
4398
4399         if (bond_mode == BOND_MODE_ALB) {
4400                 printk(KERN_NOTICE DRV_NAME
4401                        ": In ALB mode you might experience client "
4402                        "disconnections upon reconnection of a link if the "
4403                        "bonding module updelay parameter (%d msec) is "
4404                        "incompatible with the forwarding delay time of the "
4405                        "switch\n",
4406                        updelay);
4407         }
4408
4409         if (!miimon) {
4410                 if (updelay || downdelay) {
4411                         /* just warn the user the up/down delay will have
4412                          * no effect since miimon is zero...
4413                          */
4414                         printk(KERN_WARNING DRV_NAME
4415                                ": Warning: miimon module parameter not set "
4416                                "and updelay (%d) or downdelay (%d) module "
4417                                "parameter is set; updelay and downdelay have "
4418                                "no effect unless miimon is set\n",
4419                                updelay, downdelay);
4420                 }
4421         } else {
4422                 /* don't allow arp monitoring */
4423                 if (arp_interval) {
4424                         printk(KERN_WARNING DRV_NAME
4425                                ": Warning: miimon (%d) and arp_interval (%d) "
4426                                "can't be used simultaneously, disabling ARP "
4427                                "monitoring\n",
4428                                miimon, arp_interval);
4429                         arp_interval = 0;
4430                 }
4431
4432                 if ((updelay % miimon) != 0) {
4433                         printk(KERN_WARNING DRV_NAME
4434                                ": Warning: updelay (%d) is not a multiple "
4435                                "of miimon (%d), updelay rounded to %d ms\n",
4436                                updelay, miimon, (updelay / miimon) * miimon);
4437                 }
4438
4439                 updelay /= miimon;
4440
4441                 if ((downdelay % miimon) != 0) {
4442                         printk(KERN_WARNING DRV_NAME
4443                                ": Warning: downdelay (%d) is not a multiple "
4444                                "of miimon (%d), downdelay rounded to %d ms\n",
4445                                downdelay, miimon,
4446                                (downdelay / miimon) * miimon);
4447                 }
4448
4449                 downdelay /= miimon;
4450         }
4451
4452         if (arp_interval < 0) {
4453                 printk(KERN_WARNING DRV_NAME
4454                        ": Warning: arp_interval module parameter (%d) "
4455                        ", not in range 0-%d, so it was reset to %d\n",
4456                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4457                 arp_interval = BOND_LINK_ARP_INTERV;
4458         }
4459
4460         for (arp_ip_count = 0;
4461              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4462              arp_ip_count++) {
4463                 /* not complete check, but should be good enough to
4464                    catch mistakes */
4465                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4466                         printk(KERN_WARNING DRV_NAME
4467                                ": Warning: bad arp_ip_target module parameter "
4468                                "(%s), ARP monitoring will not be performed\n",
4469                                arp_ip_target[arp_ip_count]);
4470                         arp_interval = 0;
4471                 } else {
4472                         u32 ip = in_aton(arp_ip_target[arp_ip_count]);
4473                         arp_target[arp_ip_count] = ip;
4474                 }
4475         }
4476
4477         if (arp_interval && !arp_ip_count) {
4478                 /* don't allow arping if no arp_ip_target given... */
4479                 printk(KERN_WARNING DRV_NAME
4480                        ": Warning: arp_interval module parameter (%d) "
4481                        "specified without providing an arp_ip_target "
4482                        "parameter, arp_interval was reset to 0\n",
4483                        arp_interval);
4484                 arp_interval = 0;
4485         }
4486
4487         if (miimon) {
4488                 printk(KERN_INFO DRV_NAME
4489                        ": MII link monitoring set to %d ms\n",
4490                        miimon);
4491         } else if (arp_interval) {
4492                 int i;
4493
4494                 printk(KERN_INFO DRV_NAME
4495                        ": ARP monitoring set to %d ms with %d target(s):",
4496                        arp_interval, arp_ip_count);
4497
4498                 for (i = 0; i < arp_ip_count; i++)
4499                         printk (" %s", arp_ip_target[i]);
4500
4501                 printk("\n");
4502
4503         } else {
4504                 /* miimon and arp_interval not set, we need one so things
4505                  * work as expected, see bonding.txt for details
4506                  */
4507                 printk(KERN_WARNING DRV_NAME
4508                        ": Warning: either miimon or arp_interval and "
4509                        "arp_ip_target module parameters must be specified, "
4510                        "otherwise bonding will not detect link failures! see "
4511                        "bonding.txt for details.\n");
4512         }
4513
4514         if (primary && !USES_PRIMARY(bond_mode)) {
4515                 /* currently, using a primary only makes sense
4516                  * in active backup, TLB or ALB modes
4517                  */
4518                 printk(KERN_WARNING DRV_NAME
4519                        ": Warning: %s primary device specified but has no "
4520                        "effect in %s mode\n",
4521                        primary, bond_mode_name(bond_mode));
4522                 primary = NULL;
4523         }
4524
4525         /* fill params struct with the proper values */
4526         params->mode = bond_mode;
4527         params->xmit_policy = xmit_hashtype;
4528         params->miimon = miimon;
4529         params->arp_interval = arp_interval;
4530         params->updelay = updelay;
4531         params->downdelay = downdelay;
4532         params->use_carrier = use_carrier;
4533         params->lacp_fast = lacp_fast;
4534         params->primary[0] = 0;
4535
4536         if (primary) {
4537                 strncpy(params->primary, primary, IFNAMSIZ);
4538                 params->primary[IFNAMSIZ - 1] = 0;
4539         }
4540
4541         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4542
4543         return 0;
4544 }
4545
4546 /* Create a new bond based on the specified name and bonding parameters.
4547  * Caller must NOT hold rtnl_lock; we need to release it here before we
4548  * set up our sysfs entries.
4549  */
4550 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4551 {
4552         struct net_device *bond_dev;
4553         int res;
4554
4555         rtnl_lock();
4556         bond_dev = alloc_netdev(sizeof(struct bonding), name, ether_setup);
4557         if (!bond_dev) {
4558                 printk(KERN_ERR DRV_NAME
4559                        ": %s: eek! can't alloc netdev!\n",
4560                        name);
4561                 res = -ENOMEM;
4562                 goto out_rtnl;
4563         }
4564
4565         /* bond_init() must be called after dev_alloc_name() (for the
4566          * /proc files), but before register_netdevice(), because we
4567          * need to set function pointers.
4568          */
4569
4570         res = bond_init(bond_dev, params);
4571         if (res < 0) {
4572                 goto out_netdev;
4573         }
4574
4575         SET_MODULE_OWNER(bond_dev);
4576
4577         res = register_netdevice(bond_dev);
4578         if (res < 0) {
4579                 goto out_bond;
4580         }
4581         if (newbond)
4582                 *newbond = bond_dev->priv;
4583
4584         netif_carrier_off(bond_dev);
4585
4586         rtnl_unlock(); /* allows sysfs registration of net device */
4587         res = bond_create_sysfs_entry(bond_dev->priv);
4588         goto done;
4589 out_bond:
4590         bond_deinit(bond_dev);
4591 out_netdev:
4592         free_netdev(bond_dev);
4593 out_rtnl:
4594         rtnl_unlock();
4595 done:
4596         return res;
4597 }
4598
4599 static int __init bonding_init(void)
4600 {
4601         int i;
4602         int res;
4603         char new_bond_name[8];  /* Enough room for 999 bonds at init. */
4604
4605         printk(KERN_INFO "%s", version);
4606
4607         res = bond_check_params(&bonding_defaults);
4608         if (res) {
4609                 goto out;
4610         }
4611
4612 #ifdef CONFIG_PROC_FS
4613         bond_create_proc_dir();
4614 #endif
4615         for (i = 0; i < max_bonds; i++) {
4616                 sprintf(new_bond_name, "bond%d",i);
4617                 res = bond_create(new_bond_name,&bonding_defaults, NULL);
4618                 if (res)
4619                         goto err;
4620         }
4621
4622         res = bond_create_sysfs();
4623         if (res)
4624                 goto err;
4625
4626         register_netdevice_notifier(&bond_netdev_notifier);
4627         register_inetaddr_notifier(&bond_inetaddr_notifier);
4628
4629         goto out;
4630 err:
4631         rtnl_lock();
4632         bond_free_all();
4633         bond_destroy_sysfs();
4634         rtnl_unlock();
4635 out:
4636         return res;
4637
4638 }
4639
4640 static void __exit bonding_exit(void)
4641 {
4642         unregister_netdevice_notifier(&bond_netdev_notifier);
4643         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4644
4645         rtnl_lock();
4646         bond_free_all();
4647         bond_destroy_sysfs();
4648         rtnl_unlock();
4649 }
4650
4651 module_init(bonding_init);
4652 module_exit(bonding_exit);
4653 MODULE_LICENSE("GPL");
4654 MODULE_VERSION(DRV_VERSION);
4655 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4656 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4657 MODULE_SUPPORTED_DEVICE("most ethernet devices");
4658
4659 /*
4660  * Local variables:
4661  *  c-indent-level: 8
4662  *  c-basic-offset: 8
4663  *  tab-width: 8
4664  * End:
4665  */
4666