git.oblomov.eu Git - linux-2.6/blob - drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 //#define BONDING_DEBUG 1
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/ptrace.h>
  42 #include <linux/ioport.h>
  43 #include <linux/in.h>
  44 #include <net/ip.h>
  45 #include <linux/ip.h>
  46 #include <linux/tcp.h>
  47 #include <linux/udp.h>
  48 #include <linux/slab.h>
  49 #include <linux/string.h>
  50 #include <linux/init.h>
  51 #include <linux/timer.h>
  52 #include <linux/socket.h>
  53 #include <linux/ctype.h>
  54 #include <linux/inet.h>
  55 #include <linux/bitops.h>
  56 #include <asm/system.h>
  57 #include <asm/io.h>
  58 #include <asm/dma.h>
  59 #include <asm/uaccess.h>
  60 #include <linux/errno.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/inetdevice.h>
  63 #include <linux/igmp.h>
  64 #include <linux/etherdevice.h>
  65 #include <linux/skbuff.h>
  66 #include <net/sock.h>
  67 #include <linux/rtnetlink.h>
  68 #include <linux/proc_fs.h>
  69 #include <linux/seq_file.h>
  70 #include <linux/smp.h>
  71 #include <linux/if_ether.h>
  72 #include <net/arp.h>
  73 #include <linux/mii.h>
  74 #include <linux/ethtool.h>
  75 #include <linux/if_vlan.h>
  76 #include <linux/if_bonding.h>
  77 #include <net/route.h>
  78 #include <net/net_namespace.h>
  79 #include "bonding.h"
  80 #include "bond_3ad.h"
  81 #include "bond_alb.h"
  82
  83 /*---------------------------- Module parameters ----------------------------*/
  84
  85 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  86 #define BOND_LINK_MON_INTERV    0
  87 #define BOND_LINK_ARP_INTERV    0
  88
  89 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  90 static int miimon       = BOND_LINK_MON_INTERV;
  91 static int updelay      = 0;
  92 static int downdelay    = 0;
  93 static int use_carrier  = 1;
  94 static char *mode       = NULL;
  95 static char *primary    = NULL;
  96 static char *lacp_rate  = NULL;
  97 static char *xmit_hash_policy = NULL;
  98 static int arp_interval = BOND_LINK_ARP_INTERV;
  99 static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
 100 static char *arp_validate = NULL;
 101 static int fail_over_mac = 0;
 102 struct bond_params bonding_defaults;
 103
 104 module_param(max_bonds, int, 0);
 105 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 106 module_param(miimon, int, 0);
 107 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 108 module_param(updelay, int, 0);
 109 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 110 module_param(downdelay, int, 0);
 111 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 112                             "in milliseconds");
 113 module_param(use_carrier, int, 0);
 114 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 115                               "0 for off, 1 for on (default)");
 116 module_param(mode, charp, 0);
 117 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 118                        "1 for active-backup, 2 for balance-xor, "
 119                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 120                        "6 for balance-alb");
 121 module_param(primary, charp, 0);
 122 MODULE_PARM_DESC(primary, "Primary network device to use");
 123 module_param(lacp_rate, charp, 0);
 124 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 125                             "(slow/fast)");
 126 module_param(xmit_hash_policy, charp, 0);
 127 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 128                                    ", 1 for layer 3+4");
 129 module_param(arp_interval, int, 0);
 130 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 131 module_param_array(arp_ip_target, charp, NULL, 0);
 132 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 133 module_param(arp_validate, charp, 0);
 134 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 135 module_param(fail_over_mac, int, 0);
 136 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  0 of off (default), 1 for on.");
 137
 138 /*----------------------------- Global variables ----------------------------*/
 139
 140 static const char * const version =
 141         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 142
 143 LIST_HEAD(bond_dev_list);
 144
 145 #ifdef CONFIG_PROC_FS
 146 static struct proc_dir_entry *bond_proc_dir = NULL;
 147 #endif
 148
 149 extern struct rw_semaphore bonding_rwsem;
 150 static __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
 151 static int arp_ip_count = 0;
 152 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 153 static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
 154 static int lacp_fast    = 0;
 155
 156
 157 struct bond_parm_tbl bond_lacp_tbl[] = {
 158 {       "slow",         AD_LACP_SLOW},
 159 {       "fast",         AD_LACP_FAST},
 160 {       NULL,           -1},
 161 };
 162
 163 struct bond_parm_tbl bond_mode_tbl[] = {
 164 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 165 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 166 {       "balance-xor",          BOND_MODE_XOR},
 167 {       "broadcast",            BOND_MODE_BROADCAST},
 168 {       "802.3ad",              BOND_MODE_8023AD},
 169 {       "balance-tlb",          BOND_MODE_TLB},
 170 {       "balance-alb",          BOND_MODE_ALB},
 171 {       NULL,                   -1},
 172 };
 173
 174 struct bond_parm_tbl xmit_hashtype_tbl[] = {
 175 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 176 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 177 {       NULL,                   -1},
 178 };
 179
 180 struct bond_parm_tbl arp_validate_tbl[] = {
 181 {       "none",                 BOND_ARP_VALIDATE_NONE},
 182 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 183 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 184 {       "all",                  BOND_ARP_VALIDATE_ALL},
 185 {       NULL,                   -1},
 186 };
 187
 188 /*-------------------------- Forward declarations ---------------------------*/
 189
 190 static void bond_send_gratuitous_arp(struct bonding *bond);
 191
 192 /*---------------------------- General routines -----------------------------*/
 193
 194 static const char *bond_mode_name(int mode)
 195 {
 196         switch (mode) {
 197         case BOND_MODE_ROUNDROBIN :
 198                 return "load balancing (round-robin)";
 199         case BOND_MODE_ACTIVEBACKUP :
 200                 return "fault-tolerance (active-backup)";
 201         case BOND_MODE_XOR :
 202                 return "load balancing (xor)";
 203         case BOND_MODE_BROADCAST :
 204                 return "fault-tolerance (broadcast)";
 205         case BOND_MODE_8023AD:
 206                 return "IEEE 802.3ad Dynamic link aggregation";
 207         case BOND_MODE_TLB:
 208                 return "transmit load balancing";
 209         case BOND_MODE_ALB:
 210                 return "adaptive load balancing";
 211         default:
 212                 return "unknown";
 213         }
 214 }
 215
 216 /*---------------------------------- VLAN -----------------------------------*/
 217
 218 /**
 219  * bond_add_vlan - add a new vlan id on bond
 220  * @bond: bond that got the notification
 221  * @vlan_id: the vlan id to add
 222  *
 223  * Returns -ENOMEM if allocation failed.
 224  */
 225 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 226 {
 227         struct vlan_entry *vlan;
 228
 229         dprintk("bond: %s, vlan id %d\n",
 230                 (bond ? bond->dev->name: "None"), vlan_id);
 231
 232         vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 233         if (!vlan) {
 234                 return -ENOMEM;
 235         }
 236
 237         INIT_LIST_HEAD(&vlan->vlan_list);
 238         vlan->vlan_id = vlan_id;
 239         vlan->vlan_ip = 0;
 240
 241         write_lock_bh(&bond->lock);
 242
 243         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 244
 245         write_unlock_bh(&bond->lock);
 246
 247         dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 248
 249         return 0;
 250 }
 251
 252 /**
 253  * bond_del_vlan - delete a vlan id from bond
 254  * @bond: bond that got the notification
 255  * @vlan_id: the vlan id to delete
 256  *
 257  * returns -ENODEV if @vlan_id was not found in @bond.
 258  */
 259 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 260 {
 261         struct vlan_entry *vlan, *next;
 262         int res = -ENODEV;
 263
 264         dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 265
 266         write_lock_bh(&bond->lock);
 267
 268         list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
 269                 if (vlan->vlan_id == vlan_id) {
 270                         list_del(&vlan->vlan_list);
 271
 272                         if ((bond->params.mode == BOND_MODE_TLB) ||
 273                             (bond->params.mode == BOND_MODE_ALB)) {
 274                                 bond_alb_clear_vlan(bond, vlan_id);
 275                         }
 276
 277                         dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
 278                                 bond->dev->name);
 279
 280                         kfree(vlan);
 281
 282                         if (list_empty(&bond->vlan_list) &&
 283                             (bond->slave_cnt == 0)) {
 284                                 /* Last VLAN removed and no slaves, so
 285                                  * restore block on adding VLANs. This will
 286                                  * be removed once new slaves that are not
 287                                  * VLAN challenged will be added.
 288                                  */
 289                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 290                         }
 291
 292                         res = 0;
 293                         goto out;
 294                 }
 295         }
 296
 297         dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
 298                 bond->dev->name);
 299
 300 out:
 301         write_unlock_bh(&bond->lock);
 302         return res;
 303 }
 304
 305 /**
 306  * bond_has_challenged_slaves
 307  * @bond: the bond we're working on
 308  *
 309  * Searches the slave list. Returns 1 if a vlan challenged slave
 310  * was found, 0 otherwise.
 311  *
 312  * Assumes bond->lock is held.
 313  */
 314 static int bond_has_challenged_slaves(struct bonding *bond)
 315 {
 316         struct slave *slave;
 317         int i;
 318
 319         bond_for_each_slave(bond, slave, i) {
 320                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 321                         dprintk("found VLAN challenged slave - %s\n",
 322                                 slave->dev->name);
 323                         return 1;
 324                 }
 325         }
 326
 327         dprintk("no VLAN challenged slaves found\n");
 328         return 0;
 329 }
 330
 331 /**
 332  * bond_next_vlan - safely skip to the next item in the vlans list.
 333  * @bond: the bond we're working on
 334  * @curr: item we're advancing from
 335  *
 336  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 337  * or @curr->next otherwise (even if it is @curr itself again).
 338  *
 339  * Caller must hold bond->lock
 340  */
 341 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 342 {
 343         struct vlan_entry *next, *last;
 344
 345         if (list_empty(&bond->vlan_list)) {
 346                 return NULL;
 347         }
 348
 349         if (!curr) {
 350                 next = list_entry(bond->vlan_list.next,
 351                                   struct vlan_entry, vlan_list);
 352         } else {
 353                 last = list_entry(bond->vlan_list.prev,
 354                                   struct vlan_entry, vlan_list);
 355                 if (last == curr) {
 356                         next = list_entry(bond->vlan_list.next,
 357                                           struct vlan_entry, vlan_list);
 358                 } else {
 359                         next = list_entry(curr->vlan_list.next,
 360                                           struct vlan_entry, vlan_list);
 361                 }
 362         }
 363
 364         return next;
 365 }
 366
 367 /**
 368  * bond_dev_queue_xmit - Prepare skb for xmit.
 369  *
 370  * @bond: bond device that got this skb for tx.
 371  * @skb: hw accel VLAN tagged skb to transmit
 372  * @slave_dev: slave that is supposed to xmit this skbuff
 373  *
 374  * When the bond gets an skb to transmit that is
 375  * already hardware accelerated VLAN tagged, and it
 376  * needs to relay this skb to a slave that is not
 377  * hw accel capable, the skb needs to be "unaccelerated",
 378  * i.e. strip the hwaccel tag and re-insert it as part
 379  * of the payload.
 380  */
 381 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
 382 {
 383         unsigned short vlan_id;
 384
 385         if (!list_empty(&bond->vlan_list) &&
 386             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 387             vlan_get_tag(skb, &vlan_id) == 0) {
 388                 skb->dev = slave_dev;
 389                 skb = vlan_put_tag(skb, vlan_id);
 390                 if (!skb) {
 391                         /* vlan_put_tag() frees the skb in case of error,
 392                          * so return success here so the calling functions
 393                          * won't attempt to free is again.
 394                          */
 395                         return 0;
 396                 }
 397         } else {
 398                 skb->dev = slave_dev;
 399         }
 400
 401         skb->priority = 1;
 402         dev_queue_xmit(skb);
 403
 404         return 0;
 405 }
 406
 407 /*
 408  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 409  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 410  * lock because:
 411  * a. This operation is performed in IOCTL context,
 412  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 413  * c. Holding a lock with BH disabled while directly calling a base driver
 414  *    entry point is generally a BAD idea.
 415  *
 416  * The design of synchronization/protection for this operation in the 8021q
 417  * module is good for one or more VLAN devices over a single physical device
 418  * and cannot be extended for a teaming solution like bonding, so there is a
 419  * potential race condition here where a net device from the vlan group might
 420  * be referenced (either by a base driver or the 8021q code) while it is being
 421  * removed from the system. However, it turns out we're not making matters
 422  * worse, and if it works for regular VLAN usage it will work here too.
 423 */
 424
 425 /**
 426  * bond_vlan_rx_register - Propagates registration to slaves
 427  * @bond_dev: bonding net device that got called
 428  * @grp: vlan group being registered
 429  */
 430 static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
 431 {
 432         struct bonding *bond = bond_dev->priv;
 433         struct slave *slave;
 434         int i;
 435
 436         bond->vlgrp = grp;
 437
 438         bond_for_each_slave(bond, slave, i) {
 439                 struct net_device *slave_dev = slave->dev;
 440
 441                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 442                     slave_dev->vlan_rx_register) {
 443                         slave_dev->vlan_rx_register(slave_dev, grp);
 444                 }
 445         }
 446 }
 447
 448 /**
 449  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 450  * @bond_dev: bonding net device that got called
 451  * @vid: vlan id being added
 452  */
 453 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 454 {
 455         struct bonding *bond = bond_dev->priv;
 456         struct slave *slave;
 457         int i, res;
 458
 459         bond_for_each_slave(bond, slave, i) {
 460                 struct net_device *slave_dev = slave->dev;
 461
 462                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 463                     slave_dev->vlan_rx_add_vid) {
 464                         slave_dev->vlan_rx_add_vid(slave_dev, vid);
 465                 }
 466         }
 467
 468         res = bond_add_vlan(bond, vid);
 469         if (res) {
 470                 printk(KERN_ERR DRV_NAME
 471                        ": %s: Error: Failed to add vlan id %d\n",
 472                        bond_dev->name, vid);
 473         }
 474 }
 475
 476 /**
 477  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 478  * @bond_dev: bonding net device that got called
 479  * @vid: vlan id being removed
 480  */
 481 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 482 {
 483         struct bonding *bond = bond_dev->priv;
 484         struct slave *slave;
 485         struct net_device *vlan_dev;
 486         int i, res;
 487
 488         bond_for_each_slave(bond, slave, i) {
 489                 struct net_device *slave_dev = slave->dev;
 490
 491                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 492                     slave_dev->vlan_rx_kill_vid) {
 493                         /* Save and then restore vlan_dev in the grp array,
 494                          * since the slave's driver might clear it.
 495                          */
 496                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
 497                         slave_dev->vlan_rx_kill_vid(slave_dev, vid);
 498                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
 499                 }
 500         }
 501
 502         res = bond_del_vlan(bond, vid);
 503         if (res) {
 504                 printk(KERN_ERR DRV_NAME
 505                        ": %s: Error: Failed to remove vlan id %d\n",
 506                        bond_dev->name, vid);
 507         }
 508 }
 509
 510 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 511 {
 512         struct vlan_entry *vlan;
 513
 514         write_lock_bh(&bond->lock);
 515
 516         if (list_empty(&bond->vlan_list)) {
 517                 goto out;
 518         }
 519
 520         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 521             slave_dev->vlan_rx_register) {
 522                 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
 523         }
 524
 525         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 526             !(slave_dev->vlan_rx_add_vid)) {
 527                 goto out;
 528         }
 529
 530         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 531                 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 532         }
 533
 534 out:
 535         write_unlock_bh(&bond->lock);
 536 }
 537
 538 static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
 539 {
 540         struct vlan_entry *vlan;
 541         struct net_device *vlan_dev;
 542
 543         write_lock_bh(&bond->lock);
 544
 545         if (list_empty(&bond->vlan_list)) {
 546                 goto out;
 547         }
 548
 549         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 550             !(slave_dev->vlan_rx_kill_vid)) {
 551                 goto unreg;
 552         }
 553
 554         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 555                 /* Save and then restore vlan_dev in the grp array,
 556                  * since the slave's driver might clear it.
 557                  */
 558                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
 559                 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 560                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
 561         }
 562
 563 unreg:
 564         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 565             slave_dev->vlan_rx_register) {
 566                 slave_dev->vlan_rx_register(slave_dev, NULL);
 567         }
 568
 569 out:
 570         write_unlock_bh(&bond->lock);
 571 }
 572
 573 /*------------------------------- Link status -------------------------------*/
 574
 575 /*
 576  * Set the carrier state for the master according to the state of its
 577  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 578  * do special 802.3ad magic.
 579  *
 580  * Returns zero if carrier state does not change, nonzero if it does.
 581  */
 582 static int bond_set_carrier(struct bonding *bond)
 583 {
 584         struct slave *slave;
 585         int i;
 586
 587         if (bond->slave_cnt == 0)
 588                 goto down;
 589
 590         if (bond->params.mode == BOND_MODE_8023AD)
 591                 return bond_3ad_set_carrier(bond);
 592
 593         bond_for_each_slave(bond, slave, i) {
 594                 if (slave->link == BOND_LINK_UP) {
 595                         if (!netif_carrier_ok(bond->dev)) {
 596                                 netif_carrier_on(bond->dev);
 597                                 return 1;
 598                         }
 599                         return 0;
 600                 }
 601         }
 602
 603 down:
 604         if (netif_carrier_ok(bond->dev)) {
 605                 netif_carrier_off(bond->dev);
 606                 return 1;
 607         }
 608         return 0;
 609 }
 610
 611 /*
 612  * Get link speed and duplex from the slave's base driver
 613  * using ethtool. If for some reason the call fails or the
 614  * values are invalid, fake speed and duplex to 100/Full
 615  * and return error.
 616  */
 617 static int bond_update_speed_duplex(struct slave *slave)
 618 {
 619         struct net_device *slave_dev = slave->dev;
 620         struct ethtool_cmd etool;
 621         int res;
 622
 623         /* Fake speed and duplex */
 624         slave->speed = SPEED_100;
 625         slave->duplex = DUPLEX_FULL;
 626
 627         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
 628                 return -1;
 629
 630         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 631         if (res < 0)
 632                 return -1;
 633
 634         switch (etool.speed) {
 635         case SPEED_10:
 636         case SPEED_100:
 637         case SPEED_1000:
 638         case SPEED_10000:
 639                 break;
 640         default:
 641                 return -1;
 642         }
 643
 644         switch (etool.duplex) {
 645         case DUPLEX_FULL:
 646         case DUPLEX_HALF:
 647                 break;
 648         default:
 649                 return -1;
 650         }
 651
 652         slave->speed = etool.speed;
 653         slave->duplex = etool.duplex;
 654
 655         return 0;
 656 }
 657
 658 /*
 659  * if <dev> supports MII link status reporting, check its link status.
 660  *
 661  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 662  * depening upon the setting of the use_carrier parameter.
 663  *
 664  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 665  * can't tell and just pretend it is), or 0, meaning that the link is
 666  * down.
 667  *
 668  * If reporting is non-zero, instead of faking link up, return -1 if
 669  * both ETHTOOL and MII ioctls fail (meaning the device does not
 670  * support them).  If use_carrier is set, return whatever it says.
 671  * It'd be nice if there was a good way to tell if a driver supports
 672  * netif_carrier, but there really isn't.
 673  */
 674 static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
 675 {
 676         static int (* ioctl)(struct net_device *, struct ifreq *, int);
 677         struct ifreq ifr;
 678         struct mii_ioctl_data *mii;
 679
 680         if (bond->params.use_carrier) {
 681                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 682         }
 683
 684         ioctl = slave_dev->do_ioctl;
 685         if (ioctl) {
 686                 /* TODO: set pointer to correct ioctl on a per team member */
 687                 /*       bases to make this more efficient. that is, once  */
 688                 /*       we determine the correct ioctl, we will always    */
 689                 /*       call it and not the others for that team          */
 690                 /*       member.                                           */
 691
 692                 /*
 693                  * We cannot assume that SIOCGMIIPHY will also read a
 694                  * register; not all network drivers (e.g., e100)
 695                  * support that.
 696                  */
 697
 698                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 699                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 700                 mii = if_mii(&ifr);
 701                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 702                         mii->reg_num = MII_BMSR;
 703                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
 704                                 return (mii->val_out & BMSR_LSTATUS);
 705                         }
 706                 }
 707         }
 708
 709         /*
 710          * Some drivers cache ETHTOOL_GLINK for a period of time so we only
 711          * attempt to get link status from it if the above MII ioctls fail.
 712          */
 713         if (slave_dev->ethtool_ops) {
 714                 if (slave_dev->ethtool_ops->get_link) {
 715                         u32 link;
 716
 717                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 718
 719                         return link ? BMSR_LSTATUS : 0;
 720                 }
 721         }
 722
 723         /*
 724          * If reporting, report that either there's no dev->do_ioctl,
 725          * or both SIOCGMIIREG and get_link failed (meaning that we
 726          * cannot report link status).  If not reporting, pretend
 727          * we're ok.
 728          */
 729         return (reporting ? -1 : BMSR_LSTATUS);
 730 }
 731
 732 /*----------------------------- Multicast list ------------------------------*/
 733
 734 /*
 735  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
 736  */
 737 static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
 738 {
 739         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
 740                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
 741 }
 742
 743 /*
 744  * returns dmi entry if found, NULL otherwise
 745  */
 746 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
 747 {
 748         struct dev_mc_list *idmi;
 749
 750         for (idmi = mc_list; idmi; idmi = idmi->next) {
 751                 if (bond_is_dmi_same(dmi, idmi)) {
 752                         return idmi;
 753                 }
 754         }
 755
 756         return NULL;
 757 }
 758
 759 /*
 760  * Push the promiscuity flag down to appropriate slaves
 761  */
 762 static void bond_set_promiscuity(struct bonding *bond, int inc)
 763 {
 764         if (USES_PRIMARY(bond->params.mode)) {
 765                 /* write lock already acquired */
 766                 if (bond->curr_active_slave) {
 767                         dev_set_promiscuity(bond->curr_active_slave->dev, inc);
 768                 }
 769         } else {
 770                 struct slave *slave;
 771                 int i;
 772                 bond_for_each_slave(bond, slave, i) {
 773                         dev_set_promiscuity(slave->dev, inc);
 774                 }
 775         }
 776 }
 777
 778 /*
 779  * Push the allmulti flag down to all slaves
 780  */
 781 static void bond_set_allmulti(struct bonding *bond, int inc)
 782 {
 783         if (USES_PRIMARY(bond->params.mode)) {
 784                 /* write lock already acquired */
 785                 if (bond->curr_active_slave) {
 786                         dev_set_allmulti(bond->curr_active_slave->dev, inc);
 787                 }
 788         } else {
 789                 struct slave *slave;
 790                 int i;
 791                 bond_for_each_slave(bond, slave, i) {
 792                         dev_set_allmulti(slave->dev, inc);
 793                 }
 794         }
 795 }
 796
 797 /*
 798  * Add a Multicast address to slaves
 799  * according to mode
 800  */
 801 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
 802 {
 803         if (USES_PRIMARY(bond->params.mode)) {
 804                 /* write lock already acquired */
 805                 if (bond->curr_active_slave) {
 806                         dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
 807                 }
 808         } else {
 809                 struct slave *slave;
 810                 int i;
 811                 bond_for_each_slave(bond, slave, i) {
 812                         dev_mc_add(slave->dev, addr, alen, 0);
 813                 }
 814         }
 815 }
 816
 817 /*
 818  * Remove a multicast address from slave
 819  * according to mode
 820  */
 821 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
 822 {
 823         if (USES_PRIMARY(bond->params.mode)) {
 824                 /* write lock already acquired */
 825                 if (bond->curr_active_slave) {
 826                         dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
 827                 }
 828         } else {
 829                 struct slave *slave;
 830                 int i;
 831                 bond_for_each_slave(bond, slave, i) {
 832                         dev_mc_delete(slave->dev, addr, alen, 0);
 833                 }
 834         }
 835 }
 836
 837
 838 /*
 839  * Retrieve the list of registered multicast addresses for the bonding
 840  * device and retransmit an IGMP JOIN request to the current active
 841  * slave.
 842  */
 843 static void bond_resend_igmp_join_requests(struct bonding *bond)
 844 {
 845         struct in_device *in_dev;
 846         struct ip_mc_list *im;
 847
 848         rcu_read_lock();
 849         in_dev = __in_dev_get_rcu(bond->dev);
 850         if (in_dev) {
 851                 for (im = in_dev->mc_list; im; im = im->next) {
 852                         ip_mc_rejoin_group(im);
 853                 }
 854         }
 855
 856         rcu_read_unlock();
 857 }
 858
 859 /*
 860  * Totally destroys the mc_list in bond
 861  */
 862 static void bond_mc_list_destroy(struct bonding *bond)
 863 {
 864         struct dev_mc_list *dmi;
 865
 866         dmi = bond->mc_list;
 867         while (dmi) {
 868                 bond->mc_list = dmi->next;
 869                 kfree(dmi);
 870                 dmi = bond->mc_list;
 871         }
 872         bond->mc_list = NULL;
 873 }
 874
 875 /*
 876  * Copy all the Multicast addresses from src to the bonding device dst
 877  */
 878 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
 879                              gfp_t gfp_flag)
 880 {
 881         struct dev_mc_list *dmi, *new_dmi;
 882
 883         for (dmi = mc_list; dmi; dmi = dmi->next) {
 884                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
 885
 886                 if (!new_dmi) {
 887                         /* FIXME: Potential memory leak !!! */
 888                         return -ENOMEM;
 889                 }
 890
 891                 new_dmi->next = bond->mc_list;
 892                 bond->mc_list = new_dmi;
 893                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
 894                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
 895                 new_dmi->dmi_users = dmi->dmi_users;
 896                 new_dmi->dmi_gusers = dmi->dmi_gusers;
 897         }
 898
 899         return 0;
 900 }
 901
 902 /*
 903  * flush all members of flush->mc_list from device dev->mc_list
 904  */
 905 static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
 906 {
 907         struct bonding *bond = bond_dev->priv;
 908         struct dev_mc_list *dmi;
 909
 910         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
 911                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 912         }
 913
 914         if (bond->params.mode == BOND_MODE_8023AD) {
 915                 /* del lacpdu mc addr from mc list */
 916                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 917
 918                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
 919         }
 920 }
 921
 922 /*--------------------------- Active slave change ---------------------------*/
 923
 924 /*
 925  * Update the mc list and multicast-related flags for the new and
 926  * old active slaves (if any) according to the multicast mode, and
 927  * promiscuous flags unconditionally.
 928  */
 929 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
 930 {
 931         struct dev_mc_list *dmi;
 932
 933         if (!USES_PRIMARY(bond->params.mode)) {
 934                 /* nothing to do -  mc list is already up-to-date on
 935                  * all slaves
 936                  */
 937                 return;
 938         }
 939
 940         if (old_active) {
 941                 if (bond->dev->flags & IFF_PROMISC) {
 942                         dev_set_promiscuity(old_active->dev, -1);
 943                 }
 944
 945                 if (bond->dev->flags & IFF_ALLMULTI) {
 946                         dev_set_allmulti(old_active->dev, -1);
 947                 }
 948
 949                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 950                         dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 951                 }
 952         }
 953
 954         if (new_active) {
 955                 if (bond->dev->flags & IFF_PROMISC) {
 956                         dev_set_promiscuity(new_active->dev, 1);
 957                 }
 958
 959                 if (bond->dev->flags & IFF_ALLMULTI) {
 960                         dev_set_allmulti(new_active->dev, 1);
 961                 }
 962
 963                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
 964                         dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 965                 }
 966                 bond_resend_igmp_join_requests(bond);
 967         }
 968 }
 969
 970 /**
 971  * find_best_interface - select the best available slave to be the active one
 972  * @bond: our bonding struct
 973  *
 974  * Warning: Caller must hold curr_slave_lock for writing.
 975  */
 976 static struct slave *bond_find_best_slave(struct bonding *bond)
 977 {
 978         struct slave *new_active, *old_active;
 979         struct slave *bestslave = NULL;
 980         int mintime = bond->params.updelay;
 981         int i;
 982
 983         new_active = old_active = bond->curr_active_slave;
 984
 985         if (!new_active) { /* there were no active slaves left */
 986                 if (bond->slave_cnt > 0) {  /* found one slave */
 987                         new_active = bond->first_slave;
 988                 } else {
 989                         return NULL; /* still no slave, return NULL */
 990                 }
 991         }
 992
 993         /* first try the primary link; if arping, a link must tx/rx traffic
 994          * before it can be considered the curr_active_slave - also, we would skip
 995          * slaves between the curr_active_slave and primary_slave that may be up
 996          * and able to arp
 997          */
 998         if ((bond->primary_slave) &&
 999             (!bond->params.arp_interval) &&
1000             (IS_UP(bond->primary_slave->dev))) {
1001                 new_active = bond->primary_slave;
1002         }
1003
1004         /* remember where to stop iterating over the slaves */
1005         old_active = new_active;
1006
1007         bond_for_each_slave_from(bond, new_active, i, old_active) {
1008                 if (IS_UP(new_active->dev)) {
1009                         if (new_active->link == BOND_LINK_UP) {
1010                                 return new_active;
1011                         } else if (new_active->link == BOND_LINK_BACK) {
1012                                 /* link up, but waiting for stabilization */
1013                                 if (new_active->delay < mintime) {
1014                                         mintime = new_active->delay;
1015                                         bestslave = new_active;
1016                                 }
1017                         }
1018                 }
1019         }
1020
1021         return bestslave;
1022 }
1023
1024 /**
1025  * change_active_interface - change the active slave into the specified one
1026  * @bond: our bonding struct
1027  * @new: the new slave to make the active one
1028  *
1029  * Set the new slave to the bond's settings and unset them on the old
1030  * curr_active_slave.
1031  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1032  *
1033  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1034  * because it is apparently the best available slave we have, even though its
1035  * updelay hasn't timed out yet.
1036  *
1037  * Warning: Caller must hold curr_slave_lock for writing.
1038  */
1039 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1040 {
1041         struct slave *old_active = bond->curr_active_slave;
1042
1043         if (old_active == new_active) {
1044                 return;
1045         }
1046
1047         if (new_active) {
1048                 if (new_active->link == BOND_LINK_BACK) {
1049                         if (USES_PRIMARY(bond->params.mode)) {
1050                                 printk(KERN_INFO DRV_NAME
1051                                        ": %s: making interface %s the new "
1052                                        "active one %d ms earlier.\n",
1053                                        bond->dev->name, new_active->dev->name,
1054                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1055                         }
1056
1057                         new_active->delay = 0;
1058                         new_active->link = BOND_LINK_UP;
1059                         new_active->jiffies = jiffies;
1060
1061                         if (bond->params.mode == BOND_MODE_8023AD) {
1062                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1063                         }
1064
1065                         if ((bond->params.mode == BOND_MODE_TLB) ||
1066                             (bond->params.mode == BOND_MODE_ALB)) {
1067                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1068                         }
1069                 } else {
1070                         if (USES_PRIMARY(bond->params.mode)) {
1071                                 printk(KERN_INFO DRV_NAME
1072                                        ": %s: making interface %s the new "
1073                                        "active one.\n",
1074                                        bond->dev->name, new_active->dev->name);
1075                         }
1076                 }
1077         }
1078
1079         if (USES_PRIMARY(bond->params.mode)) {
1080                 bond_mc_swap(bond, new_active, old_active);
1081         }
1082
1083         if ((bond->params.mode == BOND_MODE_TLB) ||
1084             (bond->params.mode == BOND_MODE_ALB)) {
1085                 bond_alb_handle_active_change(bond, new_active);
1086                 if (old_active)
1087                         bond_set_slave_inactive_flags(old_active);
1088                 if (new_active)
1089                         bond_set_slave_active_flags(new_active);
1090         } else {
1091                 bond->curr_active_slave = new_active;
1092         }
1093
1094         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1095                 if (old_active) {
1096                         bond_set_slave_inactive_flags(old_active);
1097                 }
1098
1099                 if (new_active) {
1100                         bond_set_slave_active_flags(new_active);
1101                 }
1102
1103                 /* when bonding does not set the slave MAC address, the bond MAC
1104                  * address is the one of the active slave.
1105                  */
1106                 if (new_active && bond->params.fail_over_mac)
1107                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
1108                                 new_active->dev->addr_len);
1109                 if (bond->curr_active_slave &&
1110                         test_bit(__LINK_STATE_LINKWATCH_PENDING,
1111                                         &bond->curr_active_slave->dev->state)) {
1112                         dprintk("delaying gratuitous arp on %s\n",
1113                                 bond->curr_active_slave->dev->name);
1114                         bond->send_grat_arp = 1;
1115                 } else
1116                         bond_send_gratuitous_arp(bond);
1117         }
1118 }
1119
1120 /**
1121  * bond_select_active_slave - select a new active slave, if needed
1122  * @bond: our bonding struct
1123  *
1124  * This functions shoud be called when one of the following occurs:
1125  * - The old curr_active_slave has been released or lost its link.
1126  * - The primary_slave has got its link back.
1127  * - A slave has got its link back and there's no old curr_active_slave.
1128  *
1129  * Warning: Caller must hold curr_slave_lock for writing.
1130  */
1131 void bond_select_active_slave(struct bonding *bond)
1132 {
1133         struct slave *best_slave;
1134         int rv;
1135
1136         best_slave = bond_find_best_slave(bond);
1137         if (best_slave != bond->curr_active_slave) {
1138                 bond_change_active_slave(bond, best_slave);
1139                 rv = bond_set_carrier(bond);
1140                 if (!rv)
1141                         return;
1142
1143                 if (netif_carrier_ok(bond->dev)) {
1144                         printk(KERN_INFO DRV_NAME
1145                                ": %s: first active interface up!\n",
1146                                bond->dev->name);
1147                 } else {
1148                         printk(KERN_INFO DRV_NAME ": %s: "
1149                                "now running without any active interface !\n",
1150                                bond->dev->name);
1151                 }
1152         }
1153 }
1154
1155 /*--------------------------- slave list handling ---------------------------*/
1156
1157 /*
1158  * This function attaches the slave to the end of list.
1159  *
1160  * bond->lock held for writing by caller.
1161  */
1162 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1163 {
1164         if (bond->first_slave == NULL) { /* attaching the first slave */
1165                 new_slave->next = new_slave;
1166                 new_slave->prev = new_slave;
1167                 bond->first_slave = new_slave;
1168         } else {
1169                 new_slave->next = bond->first_slave;
1170                 new_slave->prev = bond->first_slave->prev;
1171                 new_slave->next->prev = new_slave;
1172                 new_slave->prev->next = new_slave;
1173         }
1174
1175         bond->slave_cnt++;
1176 }
1177
1178 /*
1179  * This function detaches the slave from the list.
1180  * WARNING: no check is made to verify if the slave effectively
1181  * belongs to <bond>.
1182  * Nothing is freed on return, structures are just unchained.
1183  * If any slave pointer in bond was pointing to <slave>,
1184  * it should be changed by the calling function.
1185  *
1186  * bond->lock held for writing by caller.
1187  */
1188 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1189 {
1190         if (slave->next) {
1191                 slave->next->prev = slave->prev;
1192         }
1193
1194         if (slave->prev) {
1195                 slave->prev->next = slave->next;
1196         }
1197
1198         if (bond->first_slave == slave) { /* slave is the first slave */
1199                 if (bond->slave_cnt > 1) { /* there are more slave */
1200                         bond->first_slave = slave->next;
1201                 } else {
1202                         bond->first_slave = NULL; /* slave was the last one */
1203                 }
1204         }
1205
1206         slave->next = NULL;
1207         slave->prev = NULL;
1208         bond->slave_cnt--;
1209 }
1210
1211 /*---------------------------------- IOCTL ----------------------------------*/
1212
1213 static int bond_sethwaddr(struct net_device *bond_dev,
1214                           struct net_device *slave_dev)
1215 {
1216         dprintk("bond_dev=%p\n", bond_dev);
1217         dprintk("slave_dev=%p\n", slave_dev);
1218         dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1219         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1220         return 0;
1221 }
1222
1223 #define BOND_VLAN_FEATURES \
1224         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1225          NETIF_F_HW_VLAN_FILTER)
1226
1227 /*
1228  * Compute the common dev->feature set available to all slaves.  Some
1229  * feature bits are managed elsewhere, so preserve those feature bits
1230  * on the master device.
1231  */
1232 static int bond_compute_features(struct bonding *bond)
1233 {
1234         struct slave *slave;
1235         struct net_device *bond_dev = bond->dev;
1236         unsigned long features = bond_dev->features;
1237         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1238                                                 bond_dev->hard_header_len);
1239         int i;
1240
1241         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1242         features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
1243                     NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1244
1245         bond_for_each_slave(bond, slave, i) {
1246                 features = netdev_compute_features(features,
1247                                                    slave->dev->features);
1248                 if (slave->dev->hard_header_len > max_hard_header_len)
1249                         max_hard_header_len = slave->dev->hard_header_len;
1250         }
1251
1252         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1253         bond_dev->features = features;
1254         bond_dev->hard_header_len = max_hard_header_len;
1255
1256         return 0;
1257 }
1258
1259
1260 static void bond_setup_by_slave(struct net_device *bond_dev,
1261                                 struct net_device *slave_dev)
1262 {
1263         struct bonding *bond = bond_dev->priv;
1264
1265         bond_dev->neigh_setup           = slave_dev->neigh_setup;
1266         bond_dev->header_ops            = slave_dev->header_ops;
1267
1268         bond_dev->type              = slave_dev->type;
1269         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1270         bond_dev->addr_len          = slave_dev->addr_len;
1271
1272         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1273                 slave_dev->addr_len);
1274         bond->setup_by_slave = 1;
1275 }
1276
1277 /* enslave device <slave> to bond device <master> */
1278 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1279 {
1280         struct bonding *bond = bond_dev->priv;
1281         struct slave *new_slave = NULL;
1282         struct dev_mc_list *dmi;
1283         struct sockaddr addr;
1284         int link_reporting;
1285         int old_features = bond_dev->features;
1286         int res = 0;
1287
1288         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1289                 slave_dev->do_ioctl == NULL) {
1290                 printk(KERN_WARNING DRV_NAME
1291                        ": %s: Warning: no link monitoring support for %s\n",
1292                        bond_dev->name, slave_dev->name);
1293         }
1294
1295         /* bond must be initialized by bond_open() before enslaving */
1296         if (!(bond_dev->flags & IFF_UP)) {
1297                 printk(KERN_WARNING DRV_NAME
1298                         " %s: master_dev is not up in bond_enslave\n",
1299                         bond_dev->name);
1300         }
1301
1302         /* already enslaved */
1303         if (slave_dev->flags & IFF_SLAVE) {
1304                 dprintk("Error, Device was already enslaved\n");
1305                 return -EBUSY;
1306         }
1307
1308         /* vlan challenged mutual exclusion */
1309         /* no need to lock since we're protected by rtnl_lock */
1310         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1311                 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1312                 if (!list_empty(&bond->vlan_list)) {
1313                         printk(KERN_ERR DRV_NAME
1314                                ": %s: Error: cannot enslave VLAN "
1315                                "challenged slave %s on VLAN enabled "
1316                                "bond %s\n", bond_dev->name, slave_dev->name,
1317                                bond_dev->name);
1318                         return -EPERM;
1319                 } else {
1320                         printk(KERN_WARNING DRV_NAME
1321                                ": %s: Warning: enslaved VLAN challenged "
1322                                "slave %s. Adding VLANs will be blocked as "
1323                                "long as %s is part of bond %s\n",
1324                                bond_dev->name, slave_dev->name, slave_dev->name,
1325                                bond_dev->name);
1326                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1327                 }
1328         } else {
1329                 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1330                 if (bond->slave_cnt == 0) {
1331                         /* First slave, and it is not VLAN challenged,
1332                          * so remove the block of adding VLANs over the bond.
1333                          */
1334                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1335                 }
1336         }
1337
1338         /*
1339          * Old ifenslave binaries are no longer supported.  These can
1340          * be identified with moderate accurary by the state of the slave:
1341          * the current ifenslave will set the interface down prior to
1342          * enslaving it; the old ifenslave will not.
1343          */
1344         if ((slave_dev->flags & IFF_UP)) {
1345                 printk(KERN_ERR DRV_NAME ": %s is up. "
1346                        "This may be due to an out of date ifenslave.\n",
1347                        slave_dev->name);
1348                 res = -EPERM;
1349                 goto err_undo_flags;
1350         }
1351
1352         /* set bonding device ether type by slave - bonding netdevices are
1353          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1354          * there is a need to override some of the type dependent attribs/funcs.
1355          *
1356          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1357          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1358          */
1359         if (bond->slave_cnt == 0) {
1360                 if (slave_dev->type != ARPHRD_ETHER)
1361                         bond_setup_by_slave(bond_dev, slave_dev);
1362         } else if (bond_dev->type != slave_dev->type) {
1363                 printk(KERN_ERR DRV_NAME ": %s ether type (%d) is different "
1364                         "from other slaves (%d), can not enslave it.\n",
1365                         slave_dev->name,
1366                         slave_dev->type, bond_dev->type);
1367                         res = -EINVAL;
1368                         goto err_undo_flags;
1369         }
1370
1371         if (slave_dev->set_mac_address == NULL) {
1372                 if (bond->slave_cnt == 0) {
1373                         printk(KERN_WARNING DRV_NAME
1374                                ": %s: Warning: The first slave device "
1375                                "specified does not support setting the MAC "
1376                                "address. Enabling the fail_over_mac option.",
1377                                bond_dev->name);
1378                         bond->params.fail_over_mac = 1;
1379                 } else if (!bond->params.fail_over_mac) {
1380                         printk(KERN_ERR DRV_NAME
1381                                 ": %s: Error: The slave device specified "
1382                                 "does not support setting the MAC address, "
1383                                 "but fail_over_mac is not enabled.\n"
1384                                 , bond_dev->name);
1385                         res = -EOPNOTSUPP;
1386                         goto err_undo_flags;
1387                 }
1388         }
1389
1390         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1391         if (!new_slave) {
1392                 res = -ENOMEM;
1393                 goto err_undo_flags;
1394         }
1395
1396         /* save slave's original flags before calling
1397          * netdev_set_master and dev_open
1398          */
1399         new_slave->original_flags = slave_dev->flags;
1400
1401         /*
1402          * Save slave's original ("permanent") mac address for modes
1403          * that need it, and for restoring it upon release, and then
1404          * set it to the master's address
1405          */
1406         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1407
1408         if (!bond->params.fail_over_mac) {
1409                 /*
1410                  * Set slave to master's mac address.  The application already
1411                  * set the master's mac address to that of the first slave
1412                  */
1413                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1414                 addr.sa_family = slave_dev->type;
1415                 res = dev_set_mac_address(slave_dev, &addr);
1416                 if (res) {
1417                         dprintk("Error %d calling set_mac_address\n", res);
1418                         goto err_free;
1419                 }
1420         }
1421
1422         res = netdev_set_master(slave_dev, bond_dev);
1423         if (res) {
1424                 dprintk("Error %d calling netdev_set_master\n", res);
1425                 goto err_close;
1426         }
1427         /* open the slave since the application closed it */
1428         res = dev_open(slave_dev);
1429         if (res) {
1430                 dprintk("Openning slave %s failed\n", slave_dev->name);
1431                 goto err_restore_mac;
1432         }
1433
1434         new_slave->dev = slave_dev;
1435         slave_dev->priv_flags |= IFF_BONDING;
1436
1437         if ((bond->params.mode == BOND_MODE_TLB) ||
1438             (bond->params.mode == BOND_MODE_ALB)) {
1439                 /* bond_alb_init_slave() must be called before all other stages since
1440                  * it might fail and we do not want to have to undo everything
1441                  */
1442                 res = bond_alb_init_slave(bond, new_slave);
1443                 if (res) {
1444                         goto err_unset_master;
1445                 }
1446         }
1447
1448         /* If the mode USES_PRIMARY, then the new slave gets the
1449          * master's promisc (and mc) settings only if it becomes the
1450          * curr_active_slave, and that is taken care of later when calling
1451          * bond_change_active()
1452          */
1453         if (!USES_PRIMARY(bond->params.mode)) {
1454                 /* set promiscuity level to new slave */
1455                 if (bond_dev->flags & IFF_PROMISC) {
1456                         dev_set_promiscuity(slave_dev, 1);
1457                 }
1458
1459                 /* set allmulti level to new slave */
1460                 if (bond_dev->flags & IFF_ALLMULTI) {
1461                         dev_set_allmulti(slave_dev, 1);
1462                 }
1463
1464                 /* upload master's mc_list to new slave */
1465                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1466                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1467                 }
1468         }
1469
1470         if (bond->params.mode == BOND_MODE_8023AD) {
1471                 /* add lacpdu mc addr to mc list */
1472                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1473
1474                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1475         }
1476
1477         bond_add_vlans_on_slave(bond, slave_dev);
1478
1479         write_lock_bh(&bond->lock);
1480
1481         bond_attach_slave(bond, new_slave);
1482
1483         new_slave->delay = 0;
1484         new_slave->link_failure_count = 0;
1485
1486         bond_compute_features(bond);
1487
1488         new_slave->last_arp_rx = jiffies;
1489
1490         if (bond->params.miimon && !bond->params.use_carrier) {
1491                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1492
1493                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1494                         /*
1495                          * miimon is set but a bonded network driver
1496                          * does not support ETHTOOL/MII and
1497                          * arp_interval is not set.  Note: if
1498                          * use_carrier is enabled, we will never go
1499                          * here (because netif_carrier is always
1500                          * supported); thus, we don't need to change
1501                          * the messages for netif_carrier.
1502                          */
1503                         printk(KERN_WARNING DRV_NAME
1504                                ": %s: Warning: MII and ETHTOOL support not "
1505                                "available for interface %s, and "
1506                                "arp_interval/arp_ip_target module parameters "
1507                                "not specified, thus bonding will not detect "
1508                                "link failures! see bonding.txt for details.\n",
1509                                bond_dev->name, slave_dev->name);
1510                 } else if (link_reporting == -1) {
1511                         /* unable get link status using mii/ethtool */
1512                         printk(KERN_WARNING DRV_NAME
1513                                ": %s: Warning: can't get link status from "
1514                                "interface %s; the network driver associated "
1515                                "with this interface does not support MII or "
1516                                "ETHTOOL link status reporting, thus miimon "
1517                                "has no effect on this interface.\n",
1518                                bond_dev->name, slave_dev->name);
1519                 }
1520         }
1521
1522         /* check for initial state */
1523         if (!bond->params.miimon ||
1524             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1525                 if (bond->params.updelay) {
1526                         dprintk("Initial state of slave_dev is "
1527                                 "BOND_LINK_BACK\n");
1528                         new_slave->link  = BOND_LINK_BACK;
1529                         new_slave->delay = bond->params.updelay;
1530                 } else {
1531                         dprintk("Initial state of slave_dev is "
1532                                 "BOND_LINK_UP\n");
1533                         new_slave->link  = BOND_LINK_UP;
1534                 }
1535                 new_slave->jiffies = jiffies;
1536         } else {
1537                 dprintk("Initial state of slave_dev is "
1538                         "BOND_LINK_DOWN\n");
1539                 new_slave->link  = BOND_LINK_DOWN;
1540         }
1541
1542         if (bond_update_speed_duplex(new_slave) &&
1543             (new_slave->link != BOND_LINK_DOWN)) {
1544                 printk(KERN_WARNING DRV_NAME
1545                        ": %s: Warning: failed to get speed and duplex from %s, "
1546                        "assumed to be 100Mb/sec and Full.\n",
1547                        bond_dev->name, new_slave->dev->name);
1548
1549                 if (bond->params.mode == BOND_MODE_8023AD) {
1550                         printk(KERN_WARNING DRV_NAME
1551                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1552                                "support in base driver for proper aggregator "
1553                                "selection.\n", bond_dev->name);
1554                 }
1555         }
1556
1557         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1558                 /* if there is a primary slave, remember it */
1559                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1560                         bond->primary_slave = new_slave;
1561                 }
1562         }
1563
1564         switch (bond->params.mode) {
1565         case BOND_MODE_ACTIVEBACKUP:
1566                 bond_set_slave_inactive_flags(new_slave);
1567                 bond_select_active_slave(bond);
1568                 break;
1569         case BOND_MODE_8023AD:
1570                 /* in 802.3ad mode, the internal mechanism
1571                  * will activate the slaves in the selected
1572                  * aggregator
1573                  */
1574                 bond_set_slave_inactive_flags(new_slave);
1575                 /* if this is the first slave */
1576                 if (bond->slave_cnt == 1) {
1577                         SLAVE_AD_INFO(new_slave).id = 1;
1578                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1579                          * can be called only after the mac address of the bond is set
1580                          */
1581                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1582                                             bond->params.lacp_fast);
1583                 } else {
1584                         SLAVE_AD_INFO(new_slave).id =
1585                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1586                 }
1587
1588                 bond_3ad_bind_slave(new_slave);
1589                 break;
1590         case BOND_MODE_TLB:
1591         case BOND_MODE_ALB:
1592                 new_slave->state = BOND_STATE_ACTIVE;
1593                 if ((!bond->curr_active_slave) &&
1594                     (new_slave->link != BOND_LINK_DOWN)) {
1595                         /* first slave or no active slave yet, and this link
1596                          * is OK, so make this interface the active one
1597                          */
1598                         bond_change_active_slave(bond, new_slave);
1599                 } else {
1600                         bond_set_slave_inactive_flags(new_slave);
1601                 }
1602                 break;
1603         default:
1604                 dprintk("This slave is always active in trunk mode\n");
1605
1606                 /* always active in trunk mode */
1607                 new_slave->state = BOND_STATE_ACTIVE;
1608
1609                 /* In trunking mode there is little meaning to curr_active_slave
1610                  * anyway (it holds no special properties of the bond device),
1611                  * so we can change it without calling change_active_interface()
1612                  */
1613                 if (!bond->curr_active_slave) {
1614                         bond->curr_active_slave = new_slave;
1615                 }
1616                 break;
1617         } /* switch(bond_mode) */
1618
1619         bond_set_carrier(bond);
1620
1621         write_unlock_bh(&bond->lock);
1622
1623         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1624         if (res)
1625                 goto err_unset_master;
1626
1627         printk(KERN_INFO DRV_NAME
1628                ": %s: enslaving %s as a%s interface with a%s link.\n",
1629                bond_dev->name, slave_dev->name,
1630                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1631                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1632
1633         /* enslave is successful */
1634         return 0;
1635
1636 /* Undo stages on error */
1637 err_unset_master:
1638         netdev_set_master(slave_dev, NULL);
1639
1640 err_close:
1641         dev_close(slave_dev);
1642
1643 err_restore_mac:
1644         if (!bond->params.fail_over_mac) {
1645                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1646                 addr.sa_family = slave_dev->type;
1647                 dev_set_mac_address(slave_dev, &addr);
1648         }
1649
1650 err_free:
1651         kfree(new_slave);
1652
1653 err_undo_flags:
1654         bond_dev->features = old_features;
1655
1656         return res;
1657 }
1658
1659 /*
1660  * Try to release the slave device <slave> from the bond device <master>
1661  * It is legal to access curr_active_slave without a lock because all the function
1662  * is write-locked.
1663  *
1664  * The rules for slave state should be:
1665  *   for Active/Backup:
1666  *     Active stays on all backups go down
1667  *   for Bonded connections:
1668  *     The first up interface should be left on and all others downed.
1669  */
1670 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1671 {
1672         struct bonding *bond = bond_dev->priv;
1673         struct slave *slave, *oldcurrent;
1674         struct sockaddr addr;
1675         int mac_addr_differ;
1676         DECLARE_MAC_BUF(mac);
1677
1678         /* slave is not a slave or master is not master of this slave */
1679         if (!(slave_dev->flags & IFF_SLAVE) ||
1680             (slave_dev->master != bond_dev)) {
1681                 printk(KERN_ERR DRV_NAME
1682                        ": %s: Error: cannot release %s.\n",
1683                        bond_dev->name, slave_dev->name);
1684                 return -EINVAL;
1685         }
1686
1687         write_lock_bh(&bond->lock);
1688
1689         slave = bond_get_slave_by_dev(bond, slave_dev);
1690         if (!slave) {
1691                 /* not a slave of this bond */
1692                 printk(KERN_INFO DRV_NAME
1693                        ": %s: %s not enslaved\n",
1694                        bond_dev->name, slave_dev->name);
1695                 write_unlock_bh(&bond->lock);
1696                 return -EINVAL;
1697         }
1698
1699         mac_addr_differ = memcmp(bond_dev->dev_addr,
1700                                  slave->perm_hwaddr,
1701                                  ETH_ALEN);
1702         if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1703                 printk(KERN_WARNING DRV_NAME
1704                        ": %s: Warning: the permanent HWaddr of %s - "
1705                        "%s - is still in use by %s. "
1706                        "Set the HWaddr of %s to a different address "
1707                        "to avoid conflicts.\n",
1708                        bond_dev->name,
1709                        slave_dev->name,
1710                        print_mac(mac, slave->perm_hwaddr),
1711                        bond_dev->name,
1712                        slave_dev->name);
1713         }
1714
1715         /* Inform AD package of unbinding of slave. */
1716         if (bond->params.mode == BOND_MODE_8023AD) {
1717                 /* must be called before the slave is
1718                  * detached from the list
1719                  */
1720                 bond_3ad_unbind_slave(slave);
1721         }
1722
1723         printk(KERN_INFO DRV_NAME
1724                ": %s: releasing %s interface %s\n",
1725                bond_dev->name,
1726                (slave->state == BOND_STATE_ACTIVE)
1727                ? "active" : "backup",
1728                slave_dev->name);
1729
1730         oldcurrent = bond->curr_active_slave;
1731
1732         bond->current_arp_slave = NULL;
1733
1734         /* release the slave from its bond */
1735         bond_detach_slave(bond, slave);
1736
1737         bond_compute_features(bond);
1738
1739         if (bond->primary_slave == slave) {
1740                 bond->primary_slave = NULL;
1741         }
1742
1743         if (oldcurrent == slave) {
1744                 bond_change_active_slave(bond, NULL);
1745         }
1746
1747         if ((bond->params.mode == BOND_MODE_TLB) ||
1748             (bond->params.mode == BOND_MODE_ALB)) {
1749                 /* Must be called only after the slave has been
1750                  * detached from the list and the curr_active_slave
1751                  * has been cleared (if our_slave == old_current),
1752                  * but before a new active slave is selected.
1753                  */
1754                 bond_alb_deinit_slave(bond, slave);
1755         }
1756
1757         if (oldcurrent == slave)
1758                 bond_select_active_slave(bond);
1759
1760         if (bond->slave_cnt == 0) {
1761                 bond_set_carrier(bond);
1762
1763                 /* if the last slave was removed, zero the mac address
1764                  * of the master so it will be set by the application
1765                  * to the mac address of the first slave
1766                  */
1767                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1768
1769                 if (list_empty(&bond->vlan_list)) {
1770                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1771                 } else {
1772                         printk(KERN_WARNING DRV_NAME
1773                                ": %s: Warning: clearing HW address of %s while it "
1774                                "still has VLANs.\n",
1775                                bond_dev->name, bond_dev->name);
1776                         printk(KERN_WARNING DRV_NAME
1777                                ": %s: When re-adding slaves, make sure the bond's "
1778                                "HW address matches its VLANs'.\n",
1779                                bond_dev->name);
1780                 }
1781         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1782                    !bond_has_challenged_slaves(bond)) {
1783                 printk(KERN_INFO DRV_NAME
1784                        ": %s: last VLAN challenged slave %s "
1785                        "left bond %s. VLAN blocking is removed\n",
1786                        bond_dev->name, slave_dev->name, bond_dev->name);
1787                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1788         }
1789
1790         write_unlock_bh(&bond->lock);
1791
1792         /* must do this from outside any spinlocks */
1793         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1794
1795         bond_del_vlans_from_slave(bond, slave_dev);
1796
1797         /* If the mode USES_PRIMARY, then we should only remove its
1798          * promisc and mc settings if it was the curr_active_slave, but that was
1799          * already taken care of above when we detached the slave
1800          */
1801         if (!USES_PRIMARY(bond->params.mode)) {
1802                 /* unset promiscuity level from slave */
1803                 if (bond_dev->flags & IFF_PROMISC) {
1804                         dev_set_promiscuity(slave_dev, -1);
1805                 }
1806
1807                 /* unset allmulti level from slave */
1808                 if (bond_dev->flags & IFF_ALLMULTI) {
1809                         dev_set_allmulti(slave_dev, -1);
1810                 }
1811
1812                 /* flush master's mc_list from slave */
1813                 bond_mc_list_flush(bond_dev, slave_dev);
1814         }
1815
1816         netdev_set_master(slave_dev, NULL);
1817
1818         /* close slave before restoring its mac address */
1819         dev_close(slave_dev);
1820
1821         if (!bond->params.fail_over_mac) {
1822                 /* restore original ("permanent") mac address */
1823                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1824                 addr.sa_family = slave_dev->type;
1825                 dev_set_mac_address(slave_dev, &addr);
1826         }
1827
1828         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1829                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1830                                    IFF_SLAVE_NEEDARP);
1831
1832         kfree(slave);
1833
1834         return 0;  /* deletion OK */
1835 }
1836
1837 /*
1838 * Destroy a bonding device.
1839 * Must be under rtnl_lock when this function is called.
1840 */
1841 void bond_destroy(struct bonding *bond)
1842 {
1843         bond_deinit(bond->dev);
1844         bond_destroy_sysfs_entry(bond);
1845         unregister_netdevice(bond->dev);
1846 }
1847
1848 /*
1849 * First release a slave and than destroy the bond if no more slaves iare left.
1850 * Must be under rtnl_lock when this function is called.
1851 */
1852 int  bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev)
1853 {
1854         struct bonding *bond = bond_dev->priv;
1855         int ret;
1856
1857         ret = bond_release(bond_dev, slave_dev);
1858         if ((ret == 0) && (bond->slave_cnt == 0)) {
1859                 printk(KERN_INFO DRV_NAME ": %s: destroying bond %s.\n",
1860                        bond_dev->name, bond_dev->name);
1861                 bond_destroy(bond);
1862         }
1863         return ret;
1864 }
1865
1866 /*
1867  * This function releases all slaves.
1868  */
1869 static int bond_release_all(struct net_device *bond_dev)
1870 {
1871         struct bonding *bond = bond_dev->priv;
1872         struct slave *slave;
1873         struct net_device *slave_dev;
1874         struct sockaddr addr;
1875
1876         write_lock_bh(&bond->lock);
1877
1878         netif_carrier_off(bond_dev);
1879
1880         if (bond->slave_cnt == 0) {
1881                 goto out;
1882         }
1883
1884         bond->current_arp_slave = NULL;
1885         bond->primary_slave = NULL;
1886         bond_change_active_slave(bond, NULL);
1887
1888         while ((slave = bond->first_slave) != NULL) {
1889                 /* Inform AD package of unbinding of slave
1890                  * before slave is detached from the list.
1891                  */
1892                 if (bond->params.mode == BOND_MODE_8023AD) {
1893                         bond_3ad_unbind_slave(slave);
1894                 }
1895
1896                 slave_dev = slave->dev;
1897                 bond_detach_slave(bond, slave);
1898
1899                 if ((bond->params.mode == BOND_MODE_TLB) ||
1900                     (bond->params.mode == BOND_MODE_ALB)) {
1901                         /* must be called only after the slave
1902                          * has been detached from the list
1903                          */
1904                         bond_alb_deinit_slave(bond, slave);
1905                 }
1906
1907                 bond_compute_features(bond);
1908
1909                 /* now that the slave is detached, unlock and perform
1910                  * all the undo steps that should not be called from
1911                  * within a lock.
1912                  */
1913                 write_unlock_bh(&bond->lock);
1914
1915                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1916                 bond_del_vlans_from_slave(bond, slave_dev);
1917
1918                 /* If the mode USES_PRIMARY, then we should only remove its
1919                  * promisc and mc settings if it was the curr_active_slave, but that was
1920                  * already taken care of above when we detached the slave
1921                  */
1922                 if (!USES_PRIMARY(bond->params.mode)) {
1923                         /* unset promiscuity level from slave */
1924                         if (bond_dev->flags & IFF_PROMISC) {
1925                                 dev_set_promiscuity(slave_dev, -1);
1926                         }
1927
1928                         /* unset allmulti level from slave */
1929                         if (bond_dev->flags & IFF_ALLMULTI) {
1930                                 dev_set_allmulti(slave_dev, -1);
1931                         }
1932
1933                         /* flush master's mc_list from slave */
1934                         bond_mc_list_flush(bond_dev, slave_dev);
1935                 }
1936
1937                 netdev_set_master(slave_dev, NULL);
1938
1939                 /* close slave before restoring its mac address */
1940                 dev_close(slave_dev);
1941
1942                 if (!bond->params.fail_over_mac) {
1943                         /* restore original ("permanent") mac address*/
1944                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1945                         addr.sa_family = slave_dev->type;
1946                         dev_set_mac_address(slave_dev, &addr);
1947                 }
1948
1949                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1950                                            IFF_SLAVE_INACTIVE);
1951
1952                 kfree(slave);
1953
1954                 /* re-acquire the lock before getting the next slave */
1955                 write_lock_bh(&bond->lock);
1956         }
1957
1958         /* zero the mac address of the master so it will be
1959          * set by the application to the mac address of the
1960          * first slave
1961          */
1962         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1963
1964         if (list_empty(&bond->vlan_list)) {
1965                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1966         } else {
1967                 printk(KERN_WARNING DRV_NAME
1968                        ": %s: Warning: clearing HW address of %s while it "
1969                        "still has VLANs.\n",
1970                        bond_dev->name, bond_dev->name);
1971                 printk(KERN_WARNING DRV_NAME
1972                        ": %s: When re-adding slaves, make sure the bond's "
1973                        "HW address matches its VLANs'.\n",
1974                        bond_dev->name);
1975         }
1976
1977         printk(KERN_INFO DRV_NAME
1978                ": %s: released all slaves\n",
1979                bond_dev->name);
1980
1981 out:
1982         write_unlock_bh(&bond->lock);
1983
1984         return 0;
1985 }
1986
1987 /*
1988  * This function changes the active slave to slave <slave_dev>.
1989  * It returns -EINVAL in the following cases.
1990  *  - <slave_dev> is not found in the list.
1991  *  - There is not active slave now.
1992  *  - <slave_dev> is already active.
1993  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1994  *  - <slave_dev> is not running.
1995  * In these cases, this fuction does nothing.
1996  * In the other cases, currnt_slave pointer is changed and 0 is returned.
1997  */
1998 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1999 {
2000         struct bonding *bond = bond_dev->priv;
2001         struct slave *old_active = NULL;
2002         struct slave *new_active = NULL;
2003         int res = 0;
2004
2005         if (!USES_PRIMARY(bond->params.mode)) {
2006                 return -EINVAL;
2007         }
2008
2009         /* Verify that master_dev is indeed the master of slave_dev */
2010         if (!(slave_dev->flags & IFF_SLAVE) ||
2011             (slave_dev->master != bond_dev)) {
2012                 return -EINVAL;
2013         }
2014
2015         write_lock_bh(&bond->lock);
2016
2017         old_active = bond->curr_active_slave;
2018         new_active = bond_get_slave_by_dev(bond, slave_dev);
2019
2020         /*
2021          * Changing to the current active: do nothing; return success.
2022          */
2023         if (new_active && (new_active == old_active)) {
2024                 write_unlock_bh(&bond->lock);
2025                 return 0;
2026         }
2027
2028         if ((new_active) &&
2029             (old_active) &&
2030             (new_active->link == BOND_LINK_UP) &&
2031             IS_UP(new_active->dev)) {
2032                 bond_change_active_slave(bond, new_active);
2033         } else {
2034                 res = -EINVAL;
2035         }
2036
2037         write_unlock_bh(&bond->lock);
2038
2039         return res;
2040 }
2041
2042 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2043 {
2044         struct bonding *bond = bond_dev->priv;
2045
2046         info->bond_mode = bond->params.mode;
2047         info->miimon = bond->params.miimon;
2048
2049         read_lock_bh(&bond->lock);
2050         info->num_slaves = bond->slave_cnt;
2051         read_unlock_bh(&bond->lock);
2052
2053         return 0;
2054 }
2055
2056 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2057 {
2058         struct bonding *bond = bond_dev->priv;
2059         struct slave *slave;
2060         int i, found = 0;
2061
2062         if (info->slave_id < 0) {
2063                 return -ENODEV;
2064         }
2065
2066         read_lock_bh(&bond->lock);
2067
2068         bond_for_each_slave(bond, slave, i) {
2069                 if (i == (int)info->slave_id) {
2070                         found = 1;
2071                         break;
2072                 }
2073         }
2074
2075         read_unlock_bh(&bond->lock);
2076
2077         if (found) {
2078                 strcpy(info->slave_name, slave->dev->name);
2079                 info->link = slave->link;
2080                 info->state = slave->state;
2081                 info->link_failure_count = slave->link_failure_count;
2082         } else {
2083                 return -ENODEV;
2084         }
2085
2086         return 0;
2087 }
2088
2089 /*-------------------------------- Monitoring -------------------------------*/
2090
2091 /* this function is called regularly to monitor each slave's link. */
2092 void bond_mii_monitor(struct net_device *bond_dev)
2093 {
2094         struct bonding *bond = bond_dev->priv;
2095         struct slave *slave, *oldcurrent;
2096         int do_failover = 0;
2097         int delta_in_ticks;
2098         int i;
2099
2100         read_lock(&bond->lock);
2101
2102         delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2103
2104         if (bond->kill_timers) {
2105                 goto out;
2106         }
2107
2108         if (bond->slave_cnt == 0) {
2109                 goto re_arm;
2110         }
2111
2112         /* we will try to read the link status of each of our slaves, and
2113          * set their IFF_RUNNING flag appropriately. For each slave not
2114          * supporting MII status, we won't do anything so that a user-space
2115          * program could monitor the link itself if needed.
2116          */
2117
2118         if (bond->send_grat_arp) {
2119                 if (bond->curr_active_slave && test_bit(__LINK_STATE_LINKWATCH_PENDING,
2120                                 &bond->curr_active_slave->dev->state))
2121                         dprintk("Needs to send gratuitous arp but not yet\n");
2122                 else {
2123                         dprintk("sending delayed gratuitous arp on on %s\n",
2124                                 bond->curr_active_slave->dev->name);
2125                         bond_send_gratuitous_arp(bond);
2126                         bond->send_grat_arp = 0;
2127                 }
2128         }
2129         read_lock(&bond->curr_slave_lock);
2130         oldcurrent = bond->curr_active_slave;
2131         read_unlock(&bond->curr_slave_lock);
2132
2133         bond_for_each_slave(bond, slave, i) {
2134                 struct net_device *slave_dev = slave->dev;
2135                 int link_state;
2136                 u16 old_speed = slave->speed;
2137                 u8 old_duplex = slave->duplex;
2138
2139                 link_state = bond_check_dev_link(bond, slave_dev, 0);
2140
2141                 switch (slave->link) {
2142                 case BOND_LINK_UP:      /* the link was up */
2143                         if (link_state == BMSR_LSTATUS) {
2144                                 /* link stays up, nothing more to do */
2145                                 break;
2146                         } else { /* link going down */
2147                                 slave->link  = BOND_LINK_FAIL;
2148                                 slave->delay = bond->params.downdelay;
2149
2150                                 if (slave->link_failure_count < UINT_MAX) {
2151                                         slave->link_failure_count++;
2152                                 }
2153
2154                                 if (bond->params.downdelay) {
2155                                         printk(KERN_INFO DRV_NAME
2156                                                ": %s: link status down for %s "
2157                                                "interface %s, disabling it in "
2158                                                "%d ms.\n",
2159                                                bond_dev->name,
2160                                                IS_UP(slave_dev)
2161                                                ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2162                                                   ? ((slave == oldcurrent)
2163                                                      ? "active " : "backup ")
2164                                                   : "")
2165                                                : "idle ",
2166                                                slave_dev->name,
2167                                                bond->params.downdelay * bond->params.miimon);
2168                                 }
2169                         }
2170                         /* no break ! fall through the BOND_LINK_FAIL test to
2171                            ensure proper action to be taken
2172                         */
2173                 case BOND_LINK_FAIL:    /* the link has just gone down */
2174                         if (link_state != BMSR_LSTATUS) {
2175                                 /* link stays down */
2176                                 if (slave->delay <= 0) {
2177                                         /* link down for too long time */
2178                                         slave->link = BOND_LINK_DOWN;
2179
2180                                         /* in active/backup mode, we must
2181                                          * completely disable this interface
2182                                          */
2183                                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2184                                             (bond->params.mode == BOND_MODE_8023AD)) {
2185                                                 bond_set_slave_inactive_flags(slave);
2186                                         }
2187
2188                                         printk(KERN_INFO DRV_NAME
2189                                                ": %s: link status definitely "
2190                                                "down for interface %s, "
2191                                                "disabling it\n",
2192                                                bond_dev->name,
2193                                                slave_dev->name);
2194
2195                                         /* notify ad that the link status has changed */
2196                                         if (bond->params.mode == BOND_MODE_8023AD) {
2197                                                 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2198                                         }
2199
2200                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2201                                             (bond->params.mode == BOND_MODE_ALB)) {
2202                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2203                                         }
2204
2205                                         if (slave == oldcurrent) {
2206                                                 do_failover = 1;
2207                                         }
2208                                 } else {
2209                                         slave->delay--;
2210                                 }
2211                         } else {
2212                                 /* link up again */
2213                                 slave->link  = BOND_LINK_UP;
2214                                 slave->jiffies = jiffies;
2215                                 printk(KERN_INFO DRV_NAME
2216                                        ": %s: link status up again after %d "
2217                                        "ms for interface %s.\n",
2218                                        bond_dev->name,
2219                                        (bond->params.downdelay - slave->delay) * bond->params.miimon,
2220                                        slave_dev->name);
2221                         }
2222                         break;
2223                 case BOND_LINK_DOWN:    /* the link was down */
2224                         if (link_state != BMSR_LSTATUS) {
2225                                 /* the link stays down, nothing more to do */
2226                                 break;
2227                         } else {        /* link going up */
2228                                 slave->link  = BOND_LINK_BACK;
2229                                 slave->delay = bond->params.updelay;
2230
2231                                 if (bond->params.updelay) {
2232                                         /* if updelay == 0, no need to
2233                                            advertise about a 0 ms delay */
2234                                         printk(KERN_INFO DRV_NAME
2235                                                ": %s: link status up for "
2236                                                "interface %s, enabling it "
2237                                                "in %d ms.\n",
2238                                                bond_dev->name,
2239                                                slave_dev->name,
2240                                                bond->params.updelay * bond->params.miimon);
2241                                 }
2242                         }
2243                         /* no break ! fall through the BOND_LINK_BACK state in
2244                            case there's something to do.
2245                         */
2246                 case BOND_LINK_BACK:    /* the link has just come back */
2247                         if (link_state != BMSR_LSTATUS) {
2248                                 /* link down again */
2249                                 slave->link  = BOND_LINK_DOWN;
2250
2251                                 printk(KERN_INFO DRV_NAME
2252                                        ": %s: link status down again after %d "
2253                                        "ms for interface %s.\n",
2254                                        bond_dev->name,
2255                                        (bond->params.updelay - slave->delay) * bond->params.miimon,
2256                                        slave_dev->name);
2257                         } else {
2258                                 /* link stays up */
2259                                 if (slave->delay == 0) {
2260                                         /* now the link has been up for long time enough */
2261                                         slave->link = BOND_LINK_UP;
2262                                         slave->jiffies = jiffies;
2263
2264                                         if (bond->params.mode == BOND_MODE_8023AD) {
2265                                                 /* prevent it from being the active one */
2266                                                 slave->state = BOND_STATE_BACKUP;
2267                                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2268                                                 /* make it immediately active */
2269                                                 slave->state = BOND_STATE_ACTIVE;
2270                                         } else if (slave != bond->primary_slave) {
2271                                                 /* prevent it from being the active one */
2272                                                 slave->state = BOND_STATE_BACKUP;
2273                                         }
2274
2275                                         printk(KERN_INFO DRV_NAME
2276                                                ": %s: link status definitely "
2277                                                "up for interface %s.\n",
2278                                                bond_dev->name,
2279                                                slave_dev->name);
2280
2281                                         /* notify ad that the link status has changed */
2282                                         if (bond->params.mode == BOND_MODE_8023AD) {
2283                                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2284                                         }
2285
2286                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2287                                             (bond->params.mode == BOND_MODE_ALB)) {
2288                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2289                                         }
2290
2291                                         if ((!oldcurrent) ||
2292                                             (slave == bond->primary_slave)) {
2293                                                 do_failover = 1;
2294                                         }
2295                                 } else {
2296                                         slave->delay--;
2297                                 }
2298                         }
2299                         break;
2300                 default:
2301                         /* Should not happen */
2302                         printk(KERN_ERR DRV_NAME
2303                                ": %s: Error: %s Illegal value (link=%d)\n",
2304                                bond_dev->name,
2305                                slave->dev->name,
2306                                slave->link);
2307                         goto out;
2308                 } /* end of switch (slave->link) */
2309
2310                 bond_update_speed_duplex(slave);
2311
2312                 if (bond->params.mode == BOND_MODE_8023AD) {
2313                         if (old_speed != slave->speed) {
2314                                 bond_3ad_adapter_speed_changed(slave);
2315                         }
2316
2317                         if (old_duplex != slave->duplex) {
2318                                 bond_3ad_adapter_duplex_changed(slave);
2319                         }
2320                 }
2321
2322         } /* end of for */
2323
2324         if (do_failover) {
2325                 write_lock(&bond->curr_slave_lock);
2326
2327                 bond_select_active_slave(bond);
2328
2329                 write_unlock(&bond->curr_slave_lock);
2330         } else
2331                 bond_set_carrier(bond);
2332
2333 re_arm:
2334         if (bond->params.miimon) {
2335                 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2336         }
2337 out:
2338         read_unlock(&bond->lock);
2339 }
2340
2341
2342 static __be32 bond_glean_dev_ip(struct net_device *dev)
2343 {
2344         struct in_device *idev;
2345         struct in_ifaddr *ifa;
2346         __be32 addr = 0;
2347
2348         if (!dev)
2349                 return 0;
2350
2351         rcu_read_lock();
2352         idev = __in_dev_get_rcu(dev);
2353         if (!idev)
2354                 goto out;
2355
2356         ifa = idev->ifa_list;
2357         if (!ifa)
2358                 goto out;
2359
2360         addr = ifa->ifa_local;
2361 out:
2362         rcu_read_unlock();
2363         return addr;
2364 }
2365
2366 static int bond_has_ip(struct bonding *bond)
2367 {
2368         struct vlan_entry *vlan, *vlan_next;
2369
2370         if (bond->master_ip)
2371                 return 1;
2372
2373         if (list_empty(&bond->vlan_list))
2374                 return 0;
2375
2376         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2377                                  vlan_list) {
2378                 if (vlan->vlan_ip)
2379                         return 1;
2380         }
2381
2382         return 0;
2383 }
2384
2385 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2386 {
2387         struct vlan_entry *vlan, *vlan_next;
2388
2389         if (ip == bond->master_ip)
2390                 return 1;
2391
2392         if (list_empty(&bond->vlan_list))
2393                 return 0;
2394
2395         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2396                                  vlan_list) {
2397                 if (ip == vlan->vlan_ip)
2398                         return 1;
2399         }
2400
2401         return 0;
2402 }
2403
2404 /*
2405  * We go to the (large) trouble of VLAN tagging ARP frames because
2406  * switches in VLAN mode (especially if ports are configured as
2407  * "native" to a VLAN) might not pass non-tagged frames.
2408  */
2409 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2410 {
2411         struct sk_buff *skb;
2412
2413         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2414                slave_dev->name, dest_ip, src_ip, vlan_id);
2415
2416         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2417                          NULL, slave_dev->dev_addr, NULL);
2418
2419         if (!skb) {
2420                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2421                 return;
2422         }
2423         if (vlan_id) {
2424                 skb = vlan_put_tag(skb, vlan_id);
2425                 if (!skb) {
2426                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2427                         return;
2428                 }
2429         }
2430         arp_xmit(skb);
2431 }
2432
2433
2434 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2435 {
2436         int i, vlan_id, rv;
2437         __be32 *targets = bond->params.arp_targets;
2438         struct vlan_entry *vlan, *vlan_next;
2439         struct net_device *vlan_dev;
2440         struct flowi fl;
2441         struct rtable *rt;
2442
2443         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2444                 if (!targets[i])
2445                         continue;
2446                 dprintk("basa: target %x\n", targets[i]);
2447                 if (list_empty(&bond->vlan_list)) {
2448                         dprintk("basa: empty vlan: arp_send\n");
2449                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2450                                       bond->master_ip, 0);
2451                         continue;
2452                 }
2453
2454                 /*
2455                  * If VLANs are configured, we do a route lookup to
2456                  * determine which VLAN interface would be used, so we
2457                  * can tag the ARP with the proper VLAN tag.
2458                  */
2459                 memset(&fl, 0, sizeof(fl));
2460                 fl.fl4_dst = targets[i];
2461                 fl.fl4_tos = RTO_ONLINK;
2462
2463                 rv = ip_route_output_key(&rt, &fl);
2464                 if (rv) {
2465                         if (net_ratelimit()) {
2466                                 printk(KERN_WARNING DRV_NAME
2467                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2468                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2469                         }
2470                         continue;
2471                 }
2472
2473                 /*
2474                  * This target is not on a VLAN
2475                  */
2476                 if (rt->u.dst.dev == bond->dev) {
2477                         ip_rt_put(rt);
2478                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2479                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2480                                       bond->master_ip, 0);
2481                         continue;
2482                 }
2483
2484                 vlan_id = 0;
2485                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2486                                          vlan_list) {
2487                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2488                         if (vlan_dev == rt->u.dst.dev) {
2489                                 vlan_id = vlan->vlan_id;
2490                                 dprintk("basa: vlan match on %s %d\n",
2491                                        vlan_dev->name, vlan_id);
2492                                 break;
2493                         }
2494                 }
2495
2496                 if (vlan_id) {
2497                         ip_rt_put(rt);
2498                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2499                                       vlan->vlan_ip, vlan_id);
2500                         continue;
2501                 }
2502
2503                 if (net_ratelimit()) {
2504                         printk(KERN_WARNING DRV_NAME
2505                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2506                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2507                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2508                 }
2509                 ip_rt_put(rt);
2510         }
2511 }
2512
2513 /*
2514  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2515  * for each VLAN above us.
2516  */
2517 static void bond_send_gratuitous_arp(struct bonding *bond)
2518 {
2519         struct slave *slave = bond->curr_active_slave;
2520         struct vlan_entry *vlan;
2521         struct net_device *vlan_dev;
2522
2523         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2524                                 slave ? slave->dev->name : "NULL");
2525         if (!slave)
2526                 return;
2527
2528         if (bond->master_ip) {
2529                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2530                                 bond->master_ip, 0);
2531         }
2532
2533         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2534                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2535                 if (vlan->vlan_ip) {
2536                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2537                                       vlan->vlan_ip, vlan->vlan_id);
2538                 }
2539         }
2540 }
2541
2542 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2543 {
2544         int i;
2545         __be32 *targets = bond->params.arp_targets;
2546
2547         targets = bond->params.arp_targets;
2548         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2549                 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2550                         "%u.%u.%u.%u bhti(tip) %d\n",
2551                        NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2552                        bond_has_this_ip(bond, tip));
2553                 if (sip == targets[i]) {
2554                         if (bond_has_this_ip(bond, tip))
2555                                 slave->last_arp_rx = jiffies;
2556                         return;
2557                 }
2558         }
2559 }
2560
2561 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2562 {
2563         struct arphdr *arp;
2564         struct slave *slave;
2565         struct bonding *bond;
2566         unsigned char *arp_ptr;
2567         __be32 sip, tip;
2568
2569         if (dev->nd_net != &init_net)
2570                 goto out;
2571
2572         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2573                 goto out;
2574
2575         bond = dev->priv;
2576         read_lock(&bond->lock);
2577
2578         dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2579                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2580                 orig_dev ? orig_dev->name : "NULL");
2581
2582         slave = bond_get_slave_by_dev(bond, orig_dev);
2583         if (!slave || !slave_do_arp_validate(bond, slave))
2584                 goto out_unlock;
2585
2586         /* ARP header, plus 2 device addresses, plus 2 IP addresses.  */
2587         if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
2588                                  (2 * dev->addr_len) +
2589                                  (2 * sizeof(u32)))))
2590                 goto out_unlock;
2591
2592         arp = arp_hdr(skb);
2593         if (arp->ar_hln != dev->addr_len ||
2594             skb->pkt_type == PACKET_OTHERHOST ||
2595             skb->pkt_type == PACKET_LOOPBACK ||
2596             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2597             arp->ar_pro != htons(ETH_P_IP) ||
2598             arp->ar_pln != 4)
2599                 goto out_unlock;
2600
2601         arp_ptr = (unsigned char *)(arp + 1);
2602         arp_ptr += dev->addr_len;
2603         memcpy(&sip, arp_ptr, 4);
2604         arp_ptr += 4 + dev->addr_len;
2605         memcpy(&tip, arp_ptr, 4);
2606
2607         dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2608                 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2609                 slave->state, bond->params.arp_validate,
2610                 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2611
2612         /*
2613          * Backup slaves won't see the ARP reply, but do come through
2614          * here for each ARP probe (so we swap the sip/tip to validate
2615          * the probe).  In a "redundant switch, common router" type of
2616          * configuration, the ARP probe will (hopefully) travel from
2617          * the active, through one switch, the router, then the other
2618          * switch before reaching the backup.
2619          */
2620         if (slave->state == BOND_STATE_ACTIVE)
2621                 bond_validate_arp(bond, slave, sip, tip);
2622         else
2623                 bond_validate_arp(bond, slave, tip, sip);
2624
2625 out_unlock:
2626         read_unlock(&bond->lock);
2627 out:
2628         dev_kfree_skb(skb);
2629         return NET_RX_SUCCESS;
2630 }
2631
2632 /*
2633  * this function is called regularly to monitor each slave's link
2634  * ensuring that traffic is being sent and received when arp monitoring
2635  * is used in load-balancing mode. if the adapter has been dormant, then an
2636  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2637  * arp monitoring in active backup mode.
2638  */
2639 void bond_loadbalance_arp_mon(struct net_device *bond_dev)
2640 {
2641         struct bonding *bond = bond_dev->priv;
2642         struct slave *slave, *oldcurrent;
2643         int do_failover = 0;
2644         int delta_in_ticks;
2645         int i;
2646
2647         read_lock(&bond->lock);
2648
2649         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2650
2651         if (bond->kill_timers) {
2652                 goto out;
2653         }
2654
2655         if (bond->slave_cnt == 0) {
2656                 goto re_arm;
2657         }
2658
2659         read_lock(&bond->curr_slave_lock);
2660         oldcurrent = bond->curr_active_slave;
2661         read_unlock(&bond->curr_slave_lock);
2662
2663         /* see if any of the previous devices are up now (i.e. they have
2664          * xmt and rcv traffic). the curr_active_slave does not come into
2665          * the picture unless it is null. also, slave->jiffies is not needed
2666          * here because we send an arp on each slave and give a slave as
2667          * long as it needs to get the tx/rx within the delta.
2668          * TODO: what about up/down delay in arp mode? it wasn't here before
2669          *       so it can wait
2670          */
2671         bond_for_each_slave(bond, slave, i) {
2672                 if (slave->link != BOND_LINK_UP) {
2673                         if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2674                             ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2675
2676                                 slave->link  = BOND_LINK_UP;
2677                                 slave->state = BOND_STATE_ACTIVE;
2678
2679                                 /* primary_slave has no meaning in round-robin
2680                                  * mode. the window of a slave being up and
2681                                  * curr_active_slave being null after enslaving
2682                                  * is closed.
2683                                  */
2684                                 if (!oldcurrent) {
2685                                         printk(KERN_INFO DRV_NAME
2686                                                ": %s: link status definitely "
2687                                                "up for interface %s, ",
2688                                                bond_dev->name,
2689                                                slave->dev->name);
2690                                         do_failover = 1;
2691                                 } else {
2692                                         printk(KERN_INFO DRV_NAME
2693                                                ": %s: interface %s is now up\n",
2694                                                bond_dev->name,
2695                                                slave->dev->name);
2696                                 }
2697                         }
2698                 } else {
2699                         /* slave->link == BOND_LINK_UP */
2700
2701                         /* not all switches will respond to an arp request
2702                          * when the source ip is 0, so don't take the link down
2703                          * if we don't know our ip yet
2704                          */
2705                         if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2706                             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2707                              bond_has_ip(bond))) {
2708
2709                                 slave->link  = BOND_LINK_DOWN;
2710                                 slave->state = BOND_STATE_BACKUP;
2711
2712                                 if (slave->link_failure_count < UINT_MAX) {
2713                                         slave->link_failure_count++;
2714                                 }
2715
2716                                 printk(KERN_INFO DRV_NAME
2717                                        ": %s: interface %s is now down.\n",
2718                                        bond_dev->name,
2719                                        slave->dev->name);
2720
2721                                 if (slave == oldcurrent) {
2722                                         do_failover = 1;
2723                                 }
2724                         }
2725                 }
2726
2727                 /* note: if switch is in round-robin mode, all links
2728                  * must tx arp to ensure all links rx an arp - otherwise
2729                  * links may oscillate or not come up at all; if switch is
2730                  * in something like xor mode, there is nothing we can
2731                  * do - all replies will be rx'ed on same link causing slaves
2732                  * to be unstable during low/no traffic periods
2733                  */
2734                 if (IS_UP(slave->dev)) {
2735                         bond_arp_send_all(bond, slave);
2736                 }
2737         }
2738
2739         if (do_failover) {
2740                 write_lock(&bond->curr_slave_lock);
2741
2742                 bond_select_active_slave(bond);
2743
2744                 write_unlock(&bond->curr_slave_lock);
2745         }
2746
2747 re_arm:
2748         if (bond->params.arp_interval) {
2749                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2750         }
2751 out:
2752         read_unlock(&bond->lock);
2753 }
2754
2755 /*
2756  * When using arp monitoring in active-backup mode, this function is
2757  * called to determine if any backup slaves have went down or a new
2758  * current slave needs to be found.
2759  * The backup slaves never generate traffic, they are considered up by merely
2760  * receiving traffic. If the current slave goes down, each backup slave will
2761  * be given the opportunity to tx/rx an arp before being taken down - this
2762  * prevents all slaves from being taken down due to the current slave not
2763  * sending any traffic for the backups to receive. The arps are not necessarily
2764  * necessary, any tx and rx traffic will keep the current slave up. While any
2765  * rx traffic will keep the backup slaves up, the current slave is responsible
2766  * for generating traffic to keep them up regardless of any other traffic they
2767  * may have received.
2768  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2769  */
2770 void bond_activebackup_arp_mon(struct net_device *bond_dev)
2771 {
2772         struct bonding *bond = bond_dev->priv;
2773         struct slave *slave;
2774         int delta_in_ticks;
2775         int i;
2776
2777         read_lock(&bond->lock);
2778
2779         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2780
2781         if (bond->kill_timers) {
2782                 goto out;
2783         }
2784
2785         if (bond->slave_cnt == 0) {
2786                 goto re_arm;
2787         }
2788
2789         /* determine if any slave has come up or any backup slave has
2790          * gone down
2791          * TODO: what about up/down delay in arp mode? it wasn't here before
2792          *       so it can wait
2793          */
2794         bond_for_each_slave(bond, slave, i) {
2795                 if (slave->link != BOND_LINK_UP) {
2796                         if ((jiffies - slave_last_rx(bond, slave)) <=
2797                              delta_in_ticks) {
2798
2799                                 slave->link = BOND_LINK_UP;
2800
2801                                 write_lock(&bond->curr_slave_lock);
2802
2803                                 if ((!bond->curr_active_slave) &&
2804                                     ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2805                                         bond_change_active_slave(bond, slave);
2806                                         bond->current_arp_slave = NULL;
2807                                 } else if (bond->curr_active_slave != slave) {
2808                                         /* this slave has just come up but we
2809                                          * already have a current slave; this
2810                                          * can also happen if bond_enslave adds
2811                                          * a new slave that is up while we are
2812                                          * searching for a new slave
2813                                          */
2814                                         bond_set_slave_inactive_flags(slave);
2815                                         bond->current_arp_slave = NULL;
2816                                 }
2817
2818                                 bond_set_carrier(bond);
2819
2820                                 if (slave == bond->curr_active_slave) {
2821                                         printk(KERN_INFO DRV_NAME
2822                                                ": %s: %s is up and now the "
2823                                                "active interface\n",
2824                                                bond_dev->name,
2825                                                slave->dev->name);
2826                                         netif_carrier_on(bond->dev);
2827                                 } else {
2828                                         printk(KERN_INFO DRV_NAME
2829                                                ": %s: backup interface %s is "
2830                                                "now up\n",
2831                                                bond_dev->name,
2832                                                slave->dev->name);
2833                                 }
2834
2835                                 write_unlock(&bond->curr_slave_lock);
2836                         }
2837                 } else {
2838                         read_lock(&bond->curr_slave_lock);
2839
2840                         if ((slave != bond->curr_active_slave) &&
2841                             (!bond->current_arp_slave) &&
2842                             (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
2843                              bond_has_ip(bond))) {
2844                                 /* a backup slave has gone down; three times
2845                                  * the delta allows the current slave to be
2846                                  * taken out before the backup slave.
2847                                  * note: a non-null current_arp_slave indicates
2848                                  * the curr_active_slave went down and we are
2849                                  * searching for a new one; under this
2850                                  * condition we only take the curr_active_slave
2851                                  * down - this gives each slave a chance to
2852                                  * tx/rx traffic before being taken out
2853                                  */
2854
2855                                 read_unlock(&bond->curr_slave_lock);
2856
2857                                 slave->link  = BOND_LINK_DOWN;
2858
2859                                 if (slave->link_failure_count < UINT_MAX) {
2860                                         slave->link_failure_count++;
2861                                 }
2862
2863                                 bond_set_slave_inactive_flags(slave);
2864
2865                                 printk(KERN_INFO DRV_NAME
2866                                        ": %s: backup interface %s is now down\n",
2867                                        bond_dev->name,
2868                                        slave->dev->name);
2869                         } else {
2870                                 read_unlock(&bond->curr_slave_lock);
2871                         }
2872                 }
2873         }
2874
2875         read_lock(&bond->curr_slave_lock);
2876         slave = bond->curr_active_slave;
2877         read_unlock(&bond->curr_slave_lock);
2878
2879         if (slave) {
2880                 /* if we have sent traffic in the past 2*arp_intervals but
2881                  * haven't xmit and rx traffic in that time interval, select
2882                  * a different slave. slave->jiffies is only updated when
2883                  * a slave first becomes the curr_active_slave - not necessarily
2884                  * after every arp; this ensures the slave has a full 2*delta
2885                  * before being taken out. if a primary is being used, check
2886                  * if it is up and needs to take over as the curr_active_slave
2887                  */
2888                 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2889             (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
2890              bond_has_ip(bond))) &&
2891                     ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2892
2893                         slave->link  = BOND_LINK_DOWN;
2894
2895                         if (slave->link_failure_count < UINT_MAX) {
2896                                 slave->link_failure_count++;
2897                         }
2898
2899                         printk(KERN_INFO DRV_NAME
2900                                ": %s: link status down for active interface "
2901                                "%s, disabling it\n",
2902                                bond_dev->name,
2903                                slave->dev->name);
2904
2905                         write_lock(&bond->curr_slave_lock);
2906
2907                         bond_select_active_slave(bond);
2908                         slave = bond->curr_active_slave;
2909
2910                         write_unlock(&bond->curr_slave_lock);
2911
2912                         bond->current_arp_slave = slave;
2913
2914                         if (slave) {
2915                                 slave->jiffies = jiffies;
2916                         }
2917                 } else if ((bond->primary_slave) &&
2918                            (bond->primary_slave != slave) &&
2919                            (bond->primary_slave->link == BOND_LINK_UP)) {
2920                         /* at this point, slave is the curr_active_slave */
2921                         printk(KERN_INFO DRV_NAME
2922                                ": %s: changing from interface %s to primary "
2923                                "interface %s\n",
2924                                bond_dev->name,
2925                                slave->dev->name,
2926                                bond->primary_slave->dev->name);
2927
2928                         /* primary is up so switch to it */
2929                         write_lock(&bond->curr_slave_lock);
2930                         bond_change_active_slave(bond, bond->primary_slave);
2931                         write_unlock(&bond->curr_slave_lock);
2932
2933                         slave = bond->primary_slave;
2934                         slave->jiffies = jiffies;
2935                 } else {
2936                         bond->current_arp_slave = NULL;
2937                 }
2938
2939                 /* the current slave must tx an arp to ensure backup slaves
2940                  * rx traffic
2941                  */
2942                 if (slave && bond_has_ip(bond)) {
2943                         bond_arp_send_all(bond, slave);
2944                 }
2945         }
2946
2947         /* if we don't have a curr_active_slave, search for the next available
2948          * backup slave from the current_arp_slave and make it the candidate
2949          * for becoming the curr_active_slave
2950          */
2951         if (!slave) {
2952                 if (!bond->current_arp_slave) {
2953                         bond->current_arp_slave = bond->first_slave;
2954                 }
2955
2956                 if (bond->current_arp_slave) {
2957                         bond_set_slave_inactive_flags(bond->current_arp_slave);
2958
2959                         /* search for next candidate */
2960                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2961                                 if (IS_UP(slave->dev)) {
2962                                         slave->link = BOND_LINK_BACK;
2963                                         bond_set_slave_active_flags(slave);
2964                                         bond_arp_send_all(bond, slave);
2965                                         slave->jiffies = jiffies;
2966                                         bond->current_arp_slave = slave;
2967                                         break;
2968                                 }
2969
2970                                 /* if the link state is up at this point, we
2971                                  * mark it down - this can happen if we have
2972                                  * simultaneous link failures and
2973                                  * reselect_active_interface doesn't make this
2974                                  * one the current slave so it is still marked
2975                                  * up when it is actually down
2976                                  */
2977                                 if (slave->link == BOND_LINK_UP) {
2978                                         slave->link  = BOND_LINK_DOWN;
2979                                         if (slave->link_failure_count < UINT_MAX) {
2980                                                 slave->link_failure_count++;
2981                                         }
2982
2983                                         bond_set_slave_inactive_flags(slave);
2984
2985                                         printk(KERN_INFO DRV_NAME
2986                                                ": %s: backup interface %s is "
2987                                                "now down.\n",
2988                                                bond_dev->name,
2989                                                slave->dev->name);
2990                                 }
2991                         }
2992                 }
2993         }
2994
2995 re_arm:
2996         if (bond->params.arp_interval) {
2997                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2998         }
2999 out:
3000         read_unlock(&bond->lock);
3001 }
3002
3003 /*------------------------------ proc/seq_file-------------------------------*/
3004
3005 #ifdef CONFIG_PROC_FS
3006
3007 #define SEQ_START_TOKEN ((void *)1)
3008
3009 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3010 {
3011         struct bonding *bond = seq->private;
3012         loff_t off = 0;
3013         struct slave *slave;
3014         int i;
3015
3016         /* make sure the bond won't be taken away */
3017         read_lock(&dev_base_lock);
3018         read_lock_bh(&bond->lock);
3019
3020         if (*pos == 0) {
3021                 return SEQ_START_TOKEN;
3022         }
3023
3024         bond_for_each_slave(bond, slave, i) {
3025                 if (++off == *pos) {
3026                         return slave;
3027                 }
3028         }
3029
3030         return NULL;
3031 }
3032
3033 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3034 {
3035         struct bonding *bond = seq->private;
3036         struct slave *slave = v;
3037
3038         ++*pos;
3039         if (v == SEQ_START_TOKEN) {
3040                 return bond->first_slave;
3041         }
3042
3043         slave = slave->next;
3044
3045         return (slave == bond->first_slave) ? NULL : slave;
3046 }
3047
3048 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3049 {
3050         struct bonding *bond = seq->private;
3051
3052         read_unlock_bh(&bond->lock);
3053         read_unlock(&dev_base_lock);
3054 }
3055
3056 static void bond_info_show_master(struct seq_file *seq)
3057 {
3058         struct bonding *bond = seq->private;
3059         struct slave *curr;
3060         int i;
3061         u32 target;
3062
3063         read_lock(&bond->curr_slave_lock);
3064         curr = bond->curr_active_slave;
3065         read_unlock(&bond->curr_slave_lock);
3066
3067         seq_printf(seq, "Bonding Mode: %s",
3068                    bond_mode_name(bond->params.mode));
3069
3070         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3071             bond->params.fail_over_mac)
3072                 seq_printf(seq, " (fail_over_mac)");
3073
3074         seq_printf(seq, "\n");
3075
3076         if (bond->params.mode == BOND_MODE_XOR ||
3077                 bond->params.mode == BOND_MODE_8023AD) {
3078                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3079                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3080                         bond->params.xmit_policy);
3081         }
3082
3083         if (USES_PRIMARY(bond->params.mode)) {
3084                 seq_printf(seq, "Primary Slave: %s\n",
3085                            (bond->primary_slave) ?
3086                            bond->primary_slave->dev->name : "None");
3087
3088                 seq_printf(seq, "Currently Active Slave: %s\n",
3089                            (curr) ? curr->dev->name : "None");
3090         }
3091
3092         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3093                    "up" : "down");
3094         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3095         seq_printf(seq, "Up Delay (ms): %d\n",
3096                    bond->params.updelay * bond->params.miimon);
3097         seq_printf(seq, "Down Delay (ms): %d\n",
3098                    bond->params.downdelay * bond->params.miimon);
3099
3100
3101         /* ARP information */
3102         if(bond->params.arp_interval > 0) {
3103                 int printed=0;
3104                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3105                                 bond->params.arp_interval);
3106
3107                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3108
3109                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3110                         if (!bond->params.arp_targets[i])
3111                                 continue;
3112                         if (printed)
3113                                 seq_printf(seq, ",");
3114                         target = ntohl(bond->params.arp_targets[i]);
3115                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
3116                         printed = 1;
3117                 }
3118                 seq_printf(seq, "\n");
3119         }
3120
3121         if (bond->params.mode == BOND_MODE_8023AD) {
3122                 struct ad_info ad_info;
3123                 DECLARE_MAC_BUF(mac);
3124
3125                 seq_puts(seq, "\n802.3ad info\n");
3126                 seq_printf(seq, "LACP rate: %s\n",
3127                            (bond->params.lacp_fast) ? "fast" : "slow");
3128
3129                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3130                         seq_printf(seq, "bond %s has no active aggregator\n",
3131                                    bond->dev->name);
3132                 } else {
3133                         seq_printf(seq, "Active Aggregator Info:\n");
3134
3135                         seq_printf(seq, "\tAggregator ID: %d\n",
3136                                    ad_info.aggregator_id);
3137                         seq_printf(seq, "\tNumber of ports: %d\n",
3138                                    ad_info.ports);
3139                         seq_printf(seq, "\tActor Key: %d\n",
3140                                    ad_info.actor_key);
3141                         seq_printf(seq, "\tPartner Key: %d\n",
3142                                    ad_info.partner_key);
3143                         seq_printf(seq, "\tPartner Mac Address: %s\n",
3144                                    print_mac(mac, ad_info.partner_system));
3145                 }
3146         }
3147 }
3148
3149 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3150 {
3151         struct bonding *bond = seq->private;
3152         DECLARE_MAC_BUF(mac);
3153
3154         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3155         seq_printf(seq, "MII Status: %s\n",
3156                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3157         seq_printf(seq, "Link Failure Count: %u\n",
3158                    slave->link_failure_count);
3159
3160         seq_printf(seq,
3161                    "Permanent HW addr: %s\n",
3162                    print_mac(mac, slave->perm_hwaddr));
3163
3164         if (bond->params.mode == BOND_MODE_8023AD) {
3165                 const struct aggregator *agg
3166                         = SLAVE_AD_INFO(slave).port.aggregator;
3167
3168                 if (agg) {
3169                         seq_printf(seq, "Aggregator ID: %d\n",
3170                                    agg->aggregator_identifier);
3171                 } else {
3172                         seq_puts(seq, "Aggregator ID: N/A\n");
3173                 }
3174         }
3175 }
3176
3177 static int bond_info_seq_show(struct seq_file *seq, void *v)
3178 {
3179         if (v == SEQ_START_TOKEN) {
3180                 seq_printf(seq, "%s\n", version);
3181                 bond_info_show_master(seq);
3182         } else {
3183                 bond_info_show_slave(seq, v);
3184         }
3185
3186         return 0;
3187 }
3188
3189 static struct seq_operations bond_info_seq_ops = {
3190         .start = bond_info_seq_start,
3191         .next  = bond_info_seq_next,
3192         .stop  = bond_info_seq_stop,
3193         .show  = bond_info_seq_show,
3194 };
3195
3196 static int bond_info_open(struct inode *inode, struct file *file)
3197 {
3198         struct seq_file *seq;
3199         struct proc_dir_entry *proc;
3200         int res;
3201
3202         res = seq_open(file, &bond_info_seq_ops);
3203         if (!res) {
3204                 /* recover the pointer buried in proc_dir_entry data */
3205                 seq = file->private_data;
3206                 proc = PDE(inode);
3207                 seq->private = proc->data;
3208         }
3209
3210         return res;
3211 }
3212
3213 static const struct file_operations bond_info_fops = {
3214         .owner   = THIS_MODULE,
3215         .open    = bond_info_open,
3216         .read    = seq_read,
3217         .llseek  = seq_lseek,
3218         .release = seq_release,
3219 };
3220
3221 static int bond_create_proc_entry(struct bonding *bond)
3222 {
3223         struct net_device *bond_dev = bond->dev;
3224
3225         if (bond_proc_dir) {
3226                 bond->proc_entry = create_proc_entry(bond_dev->name,
3227                                                      S_IRUGO,
3228                                                      bond_proc_dir);
3229                 if (bond->proc_entry == NULL) {
3230                         printk(KERN_WARNING DRV_NAME
3231                                ": Warning: Cannot create /proc/net/%s/%s\n",
3232                                DRV_NAME, bond_dev->name);
3233                 } else {
3234                         bond->proc_entry->data = bond;
3235                         bond->proc_entry->proc_fops = &bond_info_fops;
3236                         bond->proc_entry->owner = THIS_MODULE;
3237                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3238                 }
3239         }
3240
3241         return 0;
3242 }
3243
3244 static void bond_remove_proc_entry(struct bonding *bond)
3245 {
3246         if (bond_proc_dir && bond->proc_entry) {
3247                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3248                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3249                 bond->proc_entry = NULL;
3250         }
3251 }
3252
3253 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3254  * Caller must hold rtnl_lock.
3255  */
3256 static void bond_create_proc_dir(void)
3257 {
3258         int len = strlen(DRV_NAME);
3259
3260         for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
3261              bond_proc_dir = bond_proc_dir->next) {
3262                 if ((bond_proc_dir->namelen == len) &&
3263                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3264                         break;
3265                 }
3266         }
3267
3268         if (!bond_proc_dir) {
3269                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3270                 if (bond_proc_dir) {
3271                         bond_proc_dir->owner = THIS_MODULE;
3272                 } else {
3273                         printk(KERN_WARNING DRV_NAME
3274                                 ": Warning: cannot create /proc/net/%s\n",
3275                                 DRV_NAME);
3276                 }
3277         }
3278 }
3279
3280 /* Destroy the bonding directory under /proc/net, if empty.
3281  * Caller must hold rtnl_lock.
3282  */
3283 static void bond_destroy_proc_dir(void)
3284 {
3285         struct proc_dir_entry *de;
3286
3287         if (!bond_proc_dir) {
3288                 return;
3289         }
3290
3291         /* verify that the /proc dir is empty */
3292         for (de = bond_proc_dir->subdir; de; de = de->next) {
3293                 /* ignore . and .. */
3294                 if (*(de->name) != '.') {
3295                         break;
3296                 }
3297         }
3298
3299         if (de) {
3300                 if (bond_proc_dir->owner == THIS_MODULE) {
3301                         bond_proc_dir->owner = NULL;
3302                 }
3303         } else {
3304                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3305                 bond_proc_dir = NULL;
3306         }
3307 }
3308 #endif /* CONFIG_PROC_FS */
3309
3310 /*-------------------------- netdev event handling --------------------------*/
3311
3312 /*
3313  * Change device name
3314  */
3315 static int bond_event_changename(struct bonding *bond)
3316 {
3317 #ifdef CONFIG_PROC_FS
3318         bond_remove_proc_entry(bond);
3319         bond_create_proc_entry(bond);
3320 #endif
3321         down_write(&(bonding_rwsem));
3322         bond_destroy_sysfs_entry(bond);
3323         bond_create_sysfs_entry(bond);
3324         up_write(&(bonding_rwsem));
3325         return NOTIFY_DONE;
3326 }
3327
3328 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3329 {
3330         struct bonding *event_bond = bond_dev->priv;
3331
3332         switch (event) {
3333         case NETDEV_CHANGENAME:
3334                 return bond_event_changename(event_bond);
3335         case NETDEV_UNREGISTER:
3336                 /*
3337                  * TODO: remove a bond from the list?
3338                  */
3339                 break;
3340         default:
3341                 break;
3342         }
3343
3344         return NOTIFY_DONE;
3345 }
3346
3347 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3348 {
3349         struct net_device *bond_dev = slave_dev->master;
3350         struct bonding *bond = bond_dev->priv;
3351
3352         switch (event) {
3353         case NETDEV_UNREGISTER:
3354                 if (bond_dev) {
3355                         if (bond->setup_by_slave)
3356                                 bond_release_and_destroy(bond_dev, slave_dev);
3357                         else
3358                                 bond_release(bond_dev, slave_dev);
3359                 }
3360                 break;
3361         case NETDEV_CHANGE:
3362                 /*
3363                  * TODO: is this what we get if somebody
3364                  * sets up a hierarchical bond, then rmmod's
3365                  * one of the slave bonding devices?
3366                  */
3367                 break;
3368         case NETDEV_DOWN:
3369                 /*
3370                  * ... Or is it this?
3371                  */
3372                 break;
3373         case NETDEV_CHANGEMTU:
3374                 /*
3375                  * TODO: Should slaves be allowed to
3376                  * independently alter their MTU?  For
3377                  * an active-backup bond, slaves need
3378                  * not be the same type of device, so
3379                  * MTUs may vary.  For other modes,
3380                  * slaves arguably should have the
3381                  * same MTUs. To do this, we'd need to
3382                  * take over the slave's change_mtu
3383                  * function for the duration of their
3384                  * servitude.
3385                  */
3386                 break;
3387         case NETDEV_CHANGENAME:
3388                 /*
3389                  * TODO: handle changing the primary's name
3390                  */
3391                 break;
3392         case NETDEV_FEAT_CHANGE:
3393                 bond_compute_features(bond);
3394                 break;
3395         default:
3396                 break;
3397         }
3398
3399         return NOTIFY_DONE;
3400 }
3401
3402 /*
3403  * bond_netdev_event: handle netdev notifier chain events.
3404  *
3405  * This function receives events for the netdev chain.  The caller (an
3406  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3407  * locks for us to safely manipulate the slave devices (RTNL lock,
3408  * dev_probe_lock).
3409  */
3410 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3411 {
3412         struct net_device *event_dev = (struct net_device *)ptr;
3413
3414         if (event_dev->nd_net != &init_net)
3415                 return NOTIFY_DONE;
3416
3417         dprintk("event_dev: %s, event: %lx\n",
3418                 (event_dev ? event_dev->name : "None"),
3419                 event);
3420
3421         if (!(event_dev->priv_flags & IFF_BONDING))
3422                 return NOTIFY_DONE;
3423
3424         if (event_dev->flags & IFF_MASTER) {
3425                 dprintk("IFF_MASTER\n");
3426                 return bond_master_netdev_event(event, event_dev);
3427         }
3428
3429         if (event_dev->flags & IFF_SLAVE) {
3430                 dprintk("IFF_SLAVE\n");
3431                 return bond_slave_netdev_event(event, event_dev);
3432         }
3433
3434         return NOTIFY_DONE;
3435 }
3436
3437 /*
3438  * bond_inetaddr_event: handle inetaddr notifier chain events.
3439  *
3440  * We keep track of device IPs primarily to use as source addresses in
3441  * ARP monitor probes (rather than spewing out broadcasts all the time).
3442  *
3443  * We track one IP for the main device (if it has one), plus one per VLAN.
3444  */
3445 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3446 {
3447         struct in_ifaddr *ifa = ptr;
3448         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3449         struct bonding *bond, *bond_next;
3450         struct vlan_entry *vlan, *vlan_next;
3451
3452         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3453                 if (bond->dev == event_dev) {
3454                         switch (event) {
3455                         case NETDEV_UP:
3456                                 bond->master_ip = ifa->ifa_local;
3457                                 return NOTIFY_OK;
3458                         case NETDEV_DOWN:
3459                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3460                                 return NOTIFY_OK;
3461                         default:
3462                                 return NOTIFY_DONE;
3463                         }
3464                 }
3465
3466                 if (list_empty(&bond->vlan_list))
3467                         continue;
3468
3469                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3470                                          vlan_list) {
3471                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3472                         if (vlan_dev == event_dev) {
3473                                 switch (event) {
3474                                 case NETDEV_UP:
3475                                         vlan->vlan_ip = ifa->ifa_local;
3476                                         return NOTIFY_OK;
3477                                 case NETDEV_DOWN:
3478                                         vlan->vlan_ip =
3479                                                 bond_glean_dev_ip(vlan_dev);
3480                                         return NOTIFY_OK;
3481                                 default:
3482                                         return NOTIFY_DONE;
3483                                 }
3484                         }
3485                 }
3486         }
3487         return NOTIFY_DONE;
3488 }
3489
3490 static struct notifier_block bond_netdev_notifier = {
3491         .notifier_call = bond_netdev_event,
3492 };
3493
3494 static struct notifier_block bond_inetaddr_notifier = {
3495         .notifier_call = bond_inetaddr_event,
3496 };
3497
3498 /*-------------------------- Packet type handling ---------------------------*/
3499
3500 /* register to receive lacpdus on a bond */
3501 static void bond_register_lacpdu(struct bonding *bond)
3502 {
3503         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3504
3505         /* initialize packet type */
3506         pk_type->type = PKT_TYPE_LACPDU;
3507         pk_type->dev = bond->dev;
3508         pk_type->func = bond_3ad_lacpdu_recv;
3509
3510         dev_add_pack(pk_type);
3511 }
3512
3513 /* unregister to receive lacpdus on a bond */
3514 static void bond_unregister_lacpdu(struct bonding *bond)
3515 {
3516         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3517 }
3518
3519 void bond_register_arp(struct bonding *bond)
3520 {
3521         struct packet_type *pt = &bond->arp_mon_pt;
3522
3523         if (pt->type)
3524                 return;
3525
3526         pt->type = htons(ETH_P_ARP);
3527         pt->dev = bond->dev;
3528         pt->func = bond_arp_rcv;
3529         dev_add_pack(pt);
3530 }
3531
3532 void bond_unregister_arp(struct bonding *bond)
3533 {
3534         struct packet_type *pt = &bond->arp_mon_pt;
3535
3536         dev_remove_pack(pt);
3537         pt->type = 0;
3538 }
3539
3540 /*---------------------------- Hashing Policies -----------------------------*/
3541
3542 /*
3543  * Hash for the output device based upon layer 3 and layer 4 data. If
3544  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3545  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3546  */
3547 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3548                                     struct net_device *bond_dev, int count)
3549 {
3550         struct ethhdr *data = (struct ethhdr *)skb->data;
3551         struct iphdr *iph = ip_hdr(skb);
3552         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3553         int layer4_xor = 0;
3554
3555         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3556                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3557                     (iph->protocol == IPPROTO_TCP ||
3558                      iph->protocol == IPPROTO_UDP)) {
3559                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3560                 }
3561                 return (layer4_xor ^
3562                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3563
3564         }
3565
3566         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3567 }
3568
3569 /*
3570  * Hash for the output device based upon layer 2 data
3571  */
3572 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3573                                    struct net_device *bond_dev, int count)
3574 {
3575         struct ethhdr *data = (struct ethhdr *)skb->data;
3576
3577         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3578 }
3579
3580 /*-------------------------- Device entry points ----------------------------*/
3581
3582 static int bond_open(struct net_device *bond_dev)
3583 {
3584         struct bonding *bond = bond_dev->priv;
3585         struct timer_list *mii_timer = &bond->mii_timer;
3586         struct timer_list *arp_timer = &bond->arp_timer;
3587
3588         bond->kill_timers = 0;
3589
3590         if ((bond->params.mode == BOND_MODE_TLB) ||
3591             (bond->params.mode == BOND_MODE_ALB)) {
3592                 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3593
3594                 /* bond_alb_initialize must be called before the timer
3595                  * is started.
3596                  */
3597                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3598                         /* something went wrong - fail the open operation */
3599                         return -1;
3600                 }
3601
3602                 init_timer(alb_timer);
3603                 alb_timer->expires  = jiffies + 1;
3604                 alb_timer->data     = (unsigned long)bond;
3605                 alb_timer->function = (void *)&bond_alb_monitor;
3606                 add_timer(alb_timer);
3607         }
3608
3609         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3610                 init_timer(mii_timer);
3611                 mii_timer->expires  = jiffies + 1;
3612                 mii_timer->data     = (unsigned long)bond_dev;
3613                 mii_timer->function = (void *)&bond_mii_monitor;
3614                 add_timer(mii_timer);
3615         }
3616
3617         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3618                 init_timer(arp_timer);
3619                 arp_timer->expires  = jiffies + 1;
3620                 arp_timer->data     = (unsigned long)bond_dev;
3621                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3622                         arp_timer->function = (void *)&bond_activebackup_arp_mon;
3623                 } else {
3624                         arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3625                 }
3626                 if (bond->params.arp_validate)
3627                         bond_register_arp(bond);
3628
3629                 add_timer(arp_timer);
3630         }
3631
3632         if (bond->params.mode == BOND_MODE_8023AD) {
3633                 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3634                 init_timer(ad_timer);
3635                 ad_timer->expires  = jiffies + 1;
3636                 ad_timer->data     = (unsigned long)bond;
3637                 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3638                 add_timer(ad_timer);
3639
3640                 /* register to receive LACPDUs */
3641                 bond_register_lacpdu(bond);
3642         }
3643
3644         return 0;
3645 }
3646
3647 static int bond_close(struct net_device *bond_dev)
3648 {
3649         struct bonding *bond = bond_dev->priv;
3650
3651         if (bond->params.mode == BOND_MODE_8023AD) {
3652                 /* Unregister the receive of LACPDUs */
3653                 bond_unregister_lacpdu(bond);
3654         }
3655
3656         if (bond->params.arp_validate)
3657                 bond_unregister_arp(bond);
3658
3659         write_lock_bh(&bond->lock);
3660
3661
3662         /* signal timers not to re-arm */
3663         bond->kill_timers = 1;
3664
3665         write_unlock_bh(&bond->lock);
3666
3667         /* del_timer_sync must run without holding the bond->lock
3668          * because a running timer might be trying to hold it too
3669          */
3670
3671         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3672                 del_timer_sync(&bond->mii_timer);
3673         }
3674
3675         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3676                 del_timer_sync(&bond->arp_timer);
3677         }
3678
3679         switch (bond->params.mode) {
3680         case BOND_MODE_8023AD:
3681                 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3682                 break;
3683         case BOND_MODE_TLB:
3684         case BOND_MODE_ALB:
3685                 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3686                 break;
3687         default:
3688                 break;
3689         }
3690
3691
3692         if ((bond->params.mode == BOND_MODE_TLB) ||
3693             (bond->params.mode == BOND_MODE_ALB)) {
3694                 /* Must be called only after all
3695                  * slaves have been released
3696                  */
3697                 bond_alb_deinitialize(bond);
3698         }
3699
3700         return 0;
3701 }
3702
3703 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3704 {
3705         struct bonding *bond = bond_dev->priv;
3706         struct net_device_stats *stats = &(bond->stats), *sstats;
3707         struct slave *slave;
3708         int i;
3709
3710         memset(stats, 0, sizeof(struct net_device_stats));
3711
3712         read_lock_bh(&bond->lock);
3713
3714         bond_for_each_slave(bond, slave, i) {
3715                 sstats = slave->dev->get_stats(slave->dev);
3716                 stats->rx_packets += sstats->rx_packets;
3717                 stats->rx_bytes += sstats->rx_bytes;
3718                 stats->rx_errors += sstats->rx_errors;
3719                 stats->rx_dropped += sstats->rx_dropped;
3720
3721                 stats->tx_packets += sstats->tx_packets;
3722                 stats->tx_bytes += sstats->tx_bytes;
3723                 stats->tx_errors += sstats->tx_errors;
3724                 stats->tx_dropped += sstats->tx_dropped;
3725
3726                 stats->multicast += sstats->multicast;
3727                 stats->collisions += sstats->collisions;
3728
3729                 stats->rx_length_errors += sstats->rx_length_errors;
3730                 stats->rx_over_errors += sstats->rx_over_errors;
3731                 stats->rx_crc_errors += sstats->rx_crc_errors;
3732                 stats->rx_frame_errors += sstats->rx_frame_errors;
3733                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3734                 stats->rx_missed_errors += sstats->rx_missed_errors;
3735
3736                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3737                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3738                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3739                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3740                 stats->tx_window_errors += sstats->tx_window_errors;
3741         }
3742
3743         read_unlock_bh(&bond->lock);
3744
3745         return stats;
3746 }
3747
3748 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3749 {
3750         struct net_device *slave_dev = NULL;
3751         struct ifbond k_binfo;
3752         struct ifbond __user *u_binfo = NULL;
3753         struct ifslave k_sinfo;
3754         struct ifslave __user *u_sinfo = NULL;
3755         struct mii_ioctl_data *mii = NULL;
3756         int res = 0;
3757
3758         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3759                 bond_dev->name, cmd);
3760
3761         switch (cmd) {
3762         case SIOCGMIIPHY:
3763                 mii = if_mii(ifr);
3764                 if (!mii) {
3765                         return -EINVAL;
3766                 }
3767                 mii->phy_id = 0;
3768                 /* Fall Through */
3769         case SIOCGMIIREG:
3770                 /*
3771                  * We do this again just in case we were called by SIOCGMIIREG
3772                  * instead of SIOCGMIIPHY.
3773                  */
3774                 mii = if_mii(ifr);
3775                 if (!mii) {
3776                         return -EINVAL;
3777                 }
3778
3779                 if (mii->reg_num == 1) {
3780                         struct bonding *bond = bond_dev->priv;
3781                         mii->val_out = 0;
3782                         read_lock_bh(&bond->lock);
3783                         read_lock(&bond->curr_slave_lock);
3784                         if (netif_carrier_ok(bond->dev)) {
3785                                 mii->val_out = BMSR_LSTATUS;
3786                         }
3787                         read_unlock(&bond->curr_slave_lock);
3788                         read_unlock_bh(&bond->lock);
3789                 }
3790
3791                 return 0;
3792         case BOND_INFO_QUERY_OLD:
3793         case SIOCBONDINFOQUERY:
3794                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3795
3796                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3797                         return -EFAULT;
3798                 }
3799
3800                 res = bond_info_query(bond_dev, &k_binfo);
3801                 if (res == 0) {
3802                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3803                                 return -EFAULT;
3804                         }
3805                 }
3806
3807                 return res;
3808         case BOND_SLAVE_INFO_QUERY_OLD:
3809         case SIOCBONDSLAVEINFOQUERY:
3810                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3811
3812                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3813                         return -EFAULT;
3814                 }
3815
3816                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3817                 if (res == 0) {
3818                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3819                                 return -EFAULT;
3820                         }
3821                 }
3822
3823                 return res;
3824         default:
3825                 /* Go on */
3826                 break;
3827         }
3828
3829         if (!capable(CAP_NET_ADMIN)) {
3830                 return -EPERM;
3831         }
3832
3833         down_write(&(bonding_rwsem));
3834         slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
3835
3836         dprintk("slave_dev=%p: \n", slave_dev);
3837
3838         if (!slave_dev) {
3839                 res = -ENODEV;
3840         } else {
3841                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3842                 switch (cmd) {
3843                 case BOND_ENSLAVE_OLD:
3844                 case SIOCBONDENSLAVE:
3845                         res = bond_enslave(bond_dev, slave_dev);
3846                         break;
3847                 case BOND_RELEASE_OLD:
3848                 case SIOCBONDRELEASE:
3849                         res = bond_release(bond_dev, slave_dev);
3850                         break;
3851                 case BOND_SETHWADDR_OLD:
3852                 case SIOCBONDSETHWADDR:
3853                         res = bond_sethwaddr(bond_dev, slave_dev);
3854                         break;
3855                 case BOND_CHANGE_ACTIVE_OLD:
3856                 case SIOCBONDCHANGEACTIVE:
3857                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3858                         break;
3859                 default:
3860                         res = -EOPNOTSUPP;
3861                 }
3862
3863                 dev_put(slave_dev);
3864         }
3865
3866         up_write(&(bonding_rwsem));
3867         return res;
3868 }
3869
3870 static void bond_set_multicast_list(struct net_device *bond_dev)
3871 {
3872         struct bonding *bond = bond_dev->priv;
3873         struct dev_mc_list *dmi;
3874
3875         write_lock_bh(&bond->lock);
3876
3877         /*
3878          * Do promisc before checking multicast_mode
3879          */
3880         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3881                 bond_set_promiscuity(bond, 1);
3882         }
3883
3884         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3885                 bond_set_promiscuity(bond, -1);
3886         }
3887
3888         /* set allmulti flag to slaves */
3889         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3890                 bond_set_allmulti(bond, 1);
3891         }
3892
3893         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3894                 bond_set_allmulti(bond, -1);
3895         }
3896
3897         bond->flags = bond_dev->flags;
3898
3899         /* looking for addresses to add to slaves' mc list */
3900         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3901                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3902                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3903                 }
3904         }
3905
3906         /* looking for addresses to delete from slaves' list */
3907         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3908                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3909                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3910                 }
3911         }
3912
3913         /* save master's multicast list */
3914         bond_mc_list_destroy(bond);
3915         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3916
3917         write_unlock_bh(&bond->lock);
3918 }
3919
3920 /*
3921  * Change the MTU of all of a master's slaves to match the master
3922  */
3923 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3924 {
3925         struct bonding *bond = bond_dev->priv;
3926         struct slave *slave, *stop_at;
3927         int res = 0;
3928         int i;
3929
3930         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3931                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3932
3933         /* Can't hold bond->lock with bh disabled here since
3934          * some base drivers panic. On the other hand we can't
3935          * hold bond->lock without bh disabled because we'll
3936          * deadlock. The only solution is to rely on the fact
3937          * that we're under rtnl_lock here, and the slaves
3938          * list won't change. This doesn't solve the problem
3939          * of setting the slave's MTU while it is
3940          * transmitting, but the assumption is that the base
3941          * driver can handle that.
3942          *
3943          * TODO: figure out a way to safely iterate the slaves
3944          * list, but without holding a lock around the actual
3945          * call to the base driver.
3946          */
3947
3948         bond_for_each_slave(bond, slave, i) {
3949                 dprintk("s %p s->p %p c_m %p\n", slave,
3950                         slave->prev, slave->dev->change_mtu);
3951
3952                 res = dev_set_mtu(slave->dev, new_mtu);
3953
3954                 if (res) {
3955                         /* If we failed to set the slave's mtu to the new value
3956                          * we must abort the operation even in ACTIVE_BACKUP
3957                          * mode, because if we allow the backup slaves to have
3958                          * different mtu values than the active slave we'll
3959                          * need to change their mtu when doing a failover. That
3960                          * means changing their mtu from timer context, which
3961                          * is probably not a good idea.
3962                          */
3963                         dprintk("err %d %s\n", res, slave->dev->name);
3964                         goto unwind;
3965                 }
3966         }
3967
3968         bond_dev->mtu = new_mtu;
3969
3970         return 0;
3971
3972 unwind:
3973         /* unwind from head to the slave that failed */
3974         stop_at = slave;
3975         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3976                 int tmp_res;
3977
3978                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3979                 if (tmp_res) {
3980                         dprintk("unwind err %d dev %s\n", tmp_res,
3981                                 slave->dev->name);
3982                 }
3983         }
3984
3985         return res;
3986 }
3987
3988 /*
3989  * Change HW address
3990  *
3991  * Note that many devices must be down to change the HW address, and
3992  * downing the master releases all slaves.  We can make bonds full of
3993  * bonding devices to test this, however.
3994  */
3995 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3996 {
3997         struct bonding *bond = bond_dev->priv;
3998         struct sockaddr *sa = addr, tmp_sa;
3999         struct slave *slave, *stop_at;
4000         int res = 0;
4001         int i;
4002
4003         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
4004
4005         /*
4006          * If fail_over_mac is enabled, do nothing and return success.
4007          * Returning an error causes ifenslave to fail.
4008          */
4009         if (bond->params.fail_over_mac)
4010                 return 0;
4011
4012         if (!is_valid_ether_addr(sa->sa_data)) {
4013                 return -EADDRNOTAVAIL;
4014         }
4015
4016         /* Can't hold bond->lock with bh disabled here since
4017          * some base drivers panic. On the other hand we can't
4018          * hold bond->lock without bh disabled because we'll
4019          * deadlock. The only solution is to rely on the fact
4020          * that we're under rtnl_lock here, and the slaves
4021          * list won't change. This doesn't solve the problem
4022          * of setting the slave's hw address while it is
4023          * transmitting, but the assumption is that the base
4024          * driver can handle that.
4025          *
4026          * TODO: figure out a way to safely iterate the slaves
4027          * list, but without holding a lock around the actual
4028          * call to the base driver.
4029          */
4030
4031         bond_for_each_slave(bond, slave, i) {
4032                 dprintk("slave %p %s\n", slave, slave->dev->name);
4033
4034                 if (slave->dev->set_mac_address == NULL) {
4035                         res = -EOPNOTSUPP;
4036                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
4037                         goto unwind;
4038                 }
4039
4040                 res = dev_set_mac_address(slave->dev, addr);
4041                 if (res) {
4042                         /* TODO: consider downing the slave
4043                          * and retry ?
4044                          * User should expect communications
4045                          * breakage anyway until ARP finish
4046                          * updating, so...
4047                          */
4048                         dprintk("err %d %s\n", res, slave->dev->name);
4049                         goto unwind;
4050                 }
4051         }
4052
4053         /* success */
4054         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4055         return 0;
4056
4057 unwind:
4058         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4059         tmp_sa.sa_family = bond_dev->type;
4060
4061         /* unwind from head to the slave that failed */
4062         stop_at = slave;
4063         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4064                 int tmp_res;
4065
4066                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4067                 if (tmp_res) {
4068                         dprintk("unwind err %d dev %s\n", tmp_res,
4069                                 slave->dev->name);
4070                 }
4071         }
4072
4073         return res;
4074 }
4075
4076 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4077 {
4078         struct bonding *bond = bond_dev->priv;
4079         struct slave *slave, *start_at;
4080         int i;
4081         int res = 1;
4082
4083         read_lock(&bond->lock);
4084
4085         if (!BOND_IS_OK(bond)) {
4086                 goto out;
4087         }
4088
4089         read_lock(&bond->curr_slave_lock);
4090         slave = start_at = bond->curr_active_slave;
4091         read_unlock(&bond->curr_slave_lock);
4092
4093         if (!slave) {
4094                 goto out;
4095         }
4096
4097         bond_for_each_slave_from(bond, slave, i, start_at) {
4098                 if (IS_UP(slave->dev) &&
4099                     (slave->link == BOND_LINK_UP) &&
4100                     (slave->state == BOND_STATE_ACTIVE)) {
4101                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4102
4103                         write_lock(&bond->curr_slave_lock);
4104                         bond->curr_active_slave = slave->next;
4105                         write_unlock(&bond->curr_slave_lock);
4106
4107                         break;
4108                 }
4109         }
4110
4111
4112 out:
4113         if (res) {
4114                 /* no suitable interface, frame not sent */
4115                 dev_kfree_skb(skb);
4116         }
4117         read_unlock(&bond->lock);
4118         return 0;
4119 }
4120
4121
4122 /*
4123  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4124  * the bond has a usable interface.
4125  */
4126 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4127 {
4128         struct bonding *bond = bond_dev->priv;
4129         int res = 1;
4130
4131         read_lock(&bond->lock);
4132         read_lock(&bond->curr_slave_lock);
4133
4134         if (!BOND_IS_OK(bond)) {
4135                 goto out;
4136         }
4137
4138         if (!bond->curr_active_slave)
4139                 goto out;
4140
4141         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4142
4143 out:
4144         if (res) {
4145                 /* no suitable interface, frame not sent */
4146                 dev_kfree_skb(skb);
4147         }
4148         read_unlock(&bond->curr_slave_lock);
4149         read_unlock(&bond->lock);
4150         return 0;
4151 }
4152
4153 /*
4154  * In bond_xmit_xor() , we determine the output device by using a pre-
4155  * determined xmit_hash_policy(), If the selected device is not enabled,
4156  * find the next active slave.
4157  */
4158 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4159 {
4160         struct bonding *bond = bond_dev->priv;
4161         struct slave *slave, *start_at;
4162         int slave_no;
4163         int i;
4164         int res = 1;
4165
4166         read_lock(&bond->lock);
4167
4168         if (!BOND_IS_OK(bond)) {
4169                 goto out;
4170         }
4171
4172         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4173
4174         bond_for_each_slave(bond, slave, i) {
4175                 slave_no--;
4176                 if (slave_no < 0) {
4177                         break;
4178                 }
4179         }
4180
4181         start_at = slave;
4182
4183         bond_for_each_slave_from(bond, slave, i, start_at) {
4184                 if (IS_UP(slave->dev) &&
4185                     (slave->link == BOND_LINK_UP) &&
4186                     (slave->state == BOND_STATE_ACTIVE)) {
4187                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4188                         break;
4189                 }
4190         }
4191
4192 out:
4193         if (res) {
4194                 /* no suitable interface, frame not sent */
4195                 dev_kfree_skb(skb);
4196         }
4197         read_unlock(&bond->lock);
4198         return 0;
4199 }
4200
4201 /*
4202  * in broadcast mode, we send everything to all usable interfaces.
4203  */
4204 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4205 {
4206         struct bonding *bond = bond_dev->priv;
4207         struct slave *slave, *start_at;
4208         struct net_device *tx_dev = NULL;
4209         int i;
4210         int res = 1;
4211
4212         read_lock(&bond->lock);
4213
4214         if (!BOND_IS_OK(bond)) {
4215                 goto out;
4216         }
4217
4218         read_lock(&bond->curr_slave_lock);
4219         start_at = bond->curr_active_slave;
4220         read_unlock(&bond->curr_slave_lock);
4221
4222         if (!start_at) {
4223                 goto out;
4224         }
4225
4226         bond_for_each_slave_from(bond, slave, i, start_at) {
4227                 if (IS_UP(slave->dev) &&
4228                     (slave->link == BOND_LINK_UP) &&
4229                     (slave->state == BOND_STATE_ACTIVE)) {
4230                         if (tx_dev) {
4231                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4232                                 if (!skb2) {
4233                                         printk(KERN_ERR DRV_NAME
4234                                                ": %s: Error: bond_xmit_broadcast(): "
4235                                                "skb_clone() failed\n",
4236                                                bond_dev->name);
4237                                         continue;
4238                                 }
4239
4240                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4241                                 if (res) {
4242                                         dev_kfree_skb(skb2);
4243                                         continue;
4244                                 }
4245                         }
4246                         tx_dev = slave->dev;
4247                 }
4248         }
4249
4250         if (tx_dev) {
4251                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4252         }
4253
4254 out:
4255         if (res) {
4256                 /* no suitable interface, frame not sent */
4257                 dev_kfree_skb(skb);
4258         }
4259         /* frame sent to all suitable interfaces */
4260         read_unlock(&bond->lock);
4261         return 0;
4262 }
4263
4264 /*------------------------- Device initialization ---------------------------*/
4265
4266 /*
4267  * set bond mode specific net device operations
4268  */
4269 void bond_set_mode_ops(struct bonding *bond, int mode)
4270 {
4271         struct net_device *bond_dev = bond->dev;
4272
4273         switch (mode) {
4274         case BOND_MODE_ROUNDROBIN:
4275                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4276                 break;
4277         case BOND_MODE_ACTIVEBACKUP:
4278                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4279                 break;
4280         case BOND_MODE_XOR:
4281                 bond_dev->hard_start_xmit = bond_xmit_xor;
4282                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4283                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4284                 else
4285                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4286                 break;
4287         case BOND_MODE_BROADCAST:
4288                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4289                 break;
4290         case BOND_MODE_8023AD:
4291                 bond_set_master_3ad_flags(bond);
4292                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4293                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4294                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4295                 else
4296                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4297                 break;
4298         case BOND_MODE_ALB:
4299                 bond_set_master_alb_flags(bond);
4300                 /* FALLTHRU */
4301         case BOND_MODE_TLB:
4302                 bond_dev->hard_start_xmit = bond_alb_xmit;
4303                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4304                 break;
4305         default:
4306                 /* Should never happen, mode already checked */
4307                 printk(KERN_ERR DRV_NAME
4308                        ": %s: Error: Unknown bonding mode %d\n",
4309                        bond_dev->name,
4310                        mode);
4311                 break;
4312         }
4313 }
4314
4315 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4316                                     struct ethtool_drvinfo *drvinfo)
4317 {
4318         strncpy(drvinfo->driver, DRV_NAME, 32);
4319         strncpy(drvinfo->version, DRV_VERSION, 32);
4320         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4321 }
4322
4323 static const struct ethtool_ops bond_ethtool_ops = {
4324         .get_drvinfo            = bond_ethtool_get_drvinfo,
4325 };
4326
4327 /*
4328  * Does not allocate but creates a /proc entry.
4329  * Allowed to fail.
4330  */
4331 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4332 {
4333         struct bonding *bond = bond_dev->priv;
4334
4335         dprintk("Begin bond_init for %s\n", bond_dev->name);
4336
4337         /* initialize rwlocks */
4338         rwlock_init(&bond->lock);
4339         rwlock_init(&bond->curr_slave_lock);
4340
4341         bond->params = *params; /* copy params struct */
4342
4343         /* Initialize pointers */
4344         bond->first_slave = NULL;
4345         bond->curr_active_slave = NULL;
4346         bond->current_arp_slave = NULL;
4347         bond->primary_slave = NULL;
4348         bond->dev = bond_dev;
4349         bond->send_grat_arp = 0;
4350         bond->setup_by_slave = 0;
4351         INIT_LIST_HEAD(&bond->vlan_list);
4352
4353         /* Initialize the device entry points */
4354         bond_dev->open = bond_open;
4355         bond_dev->stop = bond_close;
4356         bond_dev->get_stats = bond_get_stats;
4357         bond_dev->do_ioctl = bond_do_ioctl;
4358         bond_dev->ethtool_ops = &bond_ethtool_ops;
4359         bond_dev->set_multicast_list = bond_set_multicast_list;
4360         bond_dev->change_mtu = bond_change_mtu;
4361         bond_dev->set_mac_address = bond_set_mac_address;
4362
4363         bond_set_mode_ops(bond, bond->params.mode);
4364
4365         bond_dev->destructor = free_netdev;
4366
4367         /* Initialize the device options */
4368         bond_dev->tx_queue_len = 0;
4369         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4370         bond_dev->priv_flags |= IFF_BONDING;
4371
4372         /* At first, we block adding VLANs. That's the only way to
4373          * prevent problems that occur when adding VLANs over an
4374          * empty bond. The block will be removed once non-challenged
4375          * slaves are enslaved.
4376          */
4377         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4378
4379         /* don't acquire bond device's netif_tx_lock when
4380          * transmitting */
4381         bond_dev->features |= NETIF_F_LLTX;
4382
4383         /* By default, we declare the bond to be fully
4384          * VLAN hardware accelerated capable. Special
4385          * care is taken in the various xmit functions
4386          * when there are slaves that are not hw accel
4387          * capable
4388          */
4389         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4390         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4391         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4392         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4393                                NETIF_F_HW_VLAN_RX |
4394                                NETIF_F_HW_VLAN_FILTER);
4395
4396 #ifdef CONFIG_PROC_FS
4397         bond_create_proc_entry(bond);
4398 #endif
4399         list_add_tail(&bond->bond_list, &bond_dev_list);
4400
4401         return 0;
4402 }
4403
4404 /* De-initialize device specific data.
4405  * Caller must hold rtnl_lock.
4406  */
4407 void bond_deinit(struct net_device *bond_dev)
4408 {
4409         struct bonding *bond = bond_dev->priv;
4410
4411         list_del(&bond->bond_list);
4412
4413 #ifdef CONFIG_PROC_FS
4414         bond_remove_proc_entry(bond);
4415 #endif
4416 }
4417
4418 /* Unregister and free all bond devices.
4419  * Caller must hold rtnl_lock.
4420  */
4421 static void bond_free_all(void)
4422 {
4423         struct bonding *bond, *nxt;
4424
4425         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4426                 struct net_device *bond_dev = bond->dev;
4427
4428                 bond_mc_list_destroy(bond);
4429                 /* Release the bonded slaves */
4430                 bond_release_all(bond_dev);
4431                 bond_deinit(bond_dev);
4432                 unregister_netdevice(bond_dev);
4433         }
4434
4435 #ifdef CONFIG_PROC_FS
4436         bond_destroy_proc_dir();
4437 #endif
4438 }
4439
4440 /*------------------------- Module initialization ---------------------------*/
4441
4442 /*
4443  * Convert string input module parms.  Accept either the
4444  * number of the mode or its string name.
4445  */
4446 int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
4447 {
4448         int i;
4449
4450         for (i = 0; tbl[i].modename; i++) {
4451                 if ((isdigit(*mode_arg) &&
4452                      tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4453                     (strncmp(mode_arg, tbl[i].modename,
4454                              strlen(tbl[i].modename)) == 0)) {
4455                         return tbl[i].mode;
4456                 }
4457         }
4458
4459         return -1;
4460 }
4461
4462 static int bond_check_params(struct bond_params *params)
4463 {
4464         int arp_validate_value;
4465
4466         /*
4467          * Convert string parameters.
4468          */
4469         if (mode) {
4470                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4471                 if (bond_mode == -1) {
4472                         printk(KERN_ERR DRV_NAME
4473                                ": Error: Invalid bonding mode \"%s\"\n",
4474                                mode == NULL ? "NULL" : mode);
4475                         return -EINVAL;
4476                 }
4477         }
4478
4479         if (xmit_hash_policy) {
4480                 if ((bond_mode != BOND_MODE_XOR) &&
4481                     (bond_mode != BOND_MODE_8023AD)) {
4482                         printk(KERN_INFO DRV_NAME
4483                                ": xor_mode param is irrelevant in mode %s\n",
4484                                bond_mode_name(bond_mode));
4485                 } else {
4486                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4487                                                         xmit_hashtype_tbl);
4488                         if (xmit_hashtype == -1) {
4489                                 printk(KERN_ERR DRV_NAME
4490                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4491                                 xmit_hash_policy == NULL ? "NULL" :
4492                                        xmit_hash_policy);
4493                                 return -EINVAL;
4494                         }
4495                 }
4496         }
4497
4498         if (lacp_rate) {
4499                 if (bond_mode != BOND_MODE_8023AD) {
4500                         printk(KERN_INFO DRV_NAME
4501                                ": lacp_rate param is irrelevant in mode %s\n",
4502                                bond_mode_name(bond_mode));
4503                 } else {
4504                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4505                         if (lacp_fast == -1) {
4506                                 printk(KERN_ERR DRV_NAME
4507                                        ": Error: Invalid lacp rate \"%s\"\n",
4508                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4509                                 return -EINVAL;
4510                         }
4511                 }
4512         }
4513
4514         if (max_bonds < 1 || max_bonds > INT_MAX) {
4515                 printk(KERN_WARNING DRV_NAME
4516                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4517                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4518                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4519                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4520         }
4521
4522         if (miimon < 0) {
4523                 printk(KERN_WARNING DRV_NAME
4524                        ": Warning: miimon module parameter (%d), "
4525                        "not in range 0-%d, so it was reset to %d\n",
4526                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4527                 miimon = BOND_LINK_MON_INTERV;
4528         }
4529
4530         if (updelay < 0) {
4531                 printk(KERN_WARNING DRV_NAME
4532                        ": Warning: updelay module parameter (%d), "
4533                        "not in range 0-%d, so it was reset to 0\n",
4534                        updelay, INT_MAX);
4535                 updelay = 0;
4536         }
4537
4538         if (downdelay < 0) {
4539                 printk(KERN_WARNING DRV_NAME
4540                        ": Warning: downdelay module parameter (%d), "
4541                        "not in range 0-%d, so it was reset to 0\n",
4542                        downdelay, INT_MAX);
4543                 downdelay = 0;
4544         }
4545
4546         if ((use_carrier != 0) && (use_carrier != 1)) {
4547                 printk(KERN_WARNING DRV_NAME
4548                        ": Warning: use_carrier module parameter (%d), "
4549                        "not of valid value (0/1), so it was set to 1\n",
4550                        use_carrier);
4551                 use_carrier = 1;
4552         }
4553
4554         /* reset values for 802.3ad */
4555         if (bond_mode == BOND_MODE_8023AD) {
4556                 if (!miimon) {
4557                         printk(KERN_WARNING DRV_NAME
4558                                ": Warning: miimon must be specified, "
4559                                "otherwise bonding will not detect link "
4560                                "failure, speed and duplex which are "
4561                                "essential for 802.3ad operation\n");
4562                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4563                         miimon = 100;
4564                 }
4565         }
4566
4567         /* reset values for TLB/ALB */
4568         if ((bond_mode == BOND_MODE_TLB) ||
4569             (bond_mode == BOND_MODE_ALB)) {
4570                 if (!miimon) {
4571                         printk(KERN_WARNING DRV_NAME
4572                                ": Warning: miimon must be specified, "
4573                                "otherwise bonding will not detect link "
4574                                "failure and link speed which are essential "
4575                                "for TLB/ALB load balancing\n");
4576                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4577                         miimon = 100;
4578                 }
4579         }
4580
4581         if (bond_mode == BOND_MODE_ALB) {
4582                 printk(KERN_NOTICE DRV_NAME
4583                        ": In ALB mode you might experience client "
4584                        "disconnections upon reconnection of a link if the "
4585                        "bonding module updelay parameter (%d msec) is "
4586                        "incompatible with the forwarding delay time of the "
4587                        "switch\n",
4588                        updelay);
4589         }
4590
4591         if (!miimon) {
4592                 if (updelay || downdelay) {
4593                         /* just warn the user the up/down delay will have
4594                          * no effect since miimon is zero...
4595                          */
4596                         printk(KERN_WARNING DRV_NAME
4597                                ": Warning: miimon module parameter not set "
4598                                "and updelay (%d) or downdelay (%d) module "
4599                                "parameter is set; updelay and downdelay have "
4600                                "no effect unless miimon is set\n",
4601                                updelay, downdelay);
4602                 }
4603         } else {
4604                 /* don't allow arp monitoring */
4605                 if (arp_interval) {
4606                         printk(KERN_WARNING DRV_NAME
4607                                ": Warning: miimon (%d) and arp_interval (%d) "
4608                                "can't be used simultaneously, disabling ARP "
4609                                "monitoring\n",
4610                                miimon, arp_interval);
4611                         arp_interval = 0;
4612                 }
4613
4614                 if ((updelay % miimon) != 0) {
4615                         printk(KERN_WARNING DRV_NAME
4616                                ": Warning: updelay (%d) is not a multiple "
4617                                "of miimon (%d), updelay rounded to %d ms\n",
4618                                updelay, miimon, (updelay / miimon) * miimon);
4619                 }
4620
4621                 updelay /= miimon;
4622
4623                 if ((downdelay % miimon) != 0) {
4624                         printk(KERN_WARNING DRV_NAME
4625                                ": Warning: downdelay (%d) is not a multiple "
4626                                "of miimon (%d), downdelay rounded to %d ms\n",
4627                                downdelay, miimon,
4628                                (downdelay / miimon) * miimon);
4629                 }
4630
4631                 downdelay /= miimon;
4632         }
4633
4634         if (arp_interval < 0) {
4635                 printk(KERN_WARNING DRV_NAME
4636                        ": Warning: arp_interval module parameter (%d) "
4637                        ", not in range 0-%d, so it was reset to %d\n",
4638                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4639                 arp_interval = BOND_LINK_ARP_INTERV;
4640         }
4641
4642         for (arp_ip_count = 0;
4643              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4644              arp_ip_count++) {
4645                 /* not complete check, but should be good enough to
4646                    catch mistakes */
4647                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4648                         printk(KERN_WARNING DRV_NAME
4649                                ": Warning: bad arp_ip_target module parameter "
4650                                "(%s), ARP monitoring will not be performed\n",
4651                                arp_ip_target[arp_ip_count]);
4652                         arp_interval = 0;
4653                 } else {
4654                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4655                         arp_target[arp_ip_count] = ip;
4656                 }
4657         }
4658
4659         if (arp_interval && !arp_ip_count) {
4660                 /* don't allow arping if no arp_ip_target given... */
4661                 printk(KERN_WARNING DRV_NAME
4662                        ": Warning: arp_interval module parameter (%d) "
4663                        "specified without providing an arp_ip_target "
4664                        "parameter, arp_interval was reset to 0\n",
4665                        arp_interval);
4666                 arp_interval = 0;
4667         }
4668
4669         if (arp_validate) {
4670                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4671                         printk(KERN_ERR DRV_NAME
4672                ": arp_validate only supported in active-backup mode\n");
4673                         return -EINVAL;
4674                 }
4675                 if (!arp_interval) {
4676                         printk(KERN_ERR DRV_NAME
4677                                ": arp_validate requires arp_interval\n");
4678                         return -EINVAL;
4679                 }
4680
4681                 arp_validate_value = bond_parse_parm(arp_validate,
4682                                                      arp_validate_tbl);
4683                 if (arp_validate_value == -1) {
4684                         printk(KERN_ERR DRV_NAME
4685                                ": Error: invalid arp_validate \"%s\"\n",
4686                                arp_validate == NULL ? "NULL" : arp_validate);
4687                         return -EINVAL;
4688                 }
4689         } else
4690                 arp_validate_value = 0;
4691
4692         if (miimon) {
4693                 printk(KERN_INFO DRV_NAME
4694                        ": MII link monitoring set to %d ms\n",
4695                        miimon);
4696         } else if (arp_interval) {
4697                 int i;
4698
4699                 printk(KERN_INFO DRV_NAME
4700                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4701                        arp_interval,
4702                        arp_validate_tbl[arp_validate_value].modename,
4703                        arp_ip_count);
4704
4705                 for (i = 0; i < arp_ip_count; i++)
4706                         printk (" %s", arp_ip_target[i]);
4707
4708                 printk("\n");
4709
4710         } else {
4711                 /* miimon and arp_interval not set, we need one so things
4712                  * work as expected, see bonding.txt for details
4713                  */
4714                 printk(KERN_WARNING DRV_NAME
4715                        ": Warning: either miimon or arp_interval and "
4716                        "arp_ip_target module parameters must be specified, "
4717                        "otherwise bonding will not detect link failures! see "
4718                        "bonding.txt for details.\n");
4719         }
4720
4721         if (primary && !USES_PRIMARY(bond_mode)) {
4722                 /* currently, using a primary only makes sense
4723                  * in active backup, TLB or ALB modes
4724                  */
4725                 printk(KERN_WARNING DRV_NAME
4726                        ": Warning: %s primary device specified but has no "
4727                        "effect in %s mode\n",
4728                        primary, bond_mode_name(bond_mode));
4729                 primary = NULL;
4730         }
4731
4732         if (fail_over_mac && (bond_mode != BOND_MODE_ACTIVEBACKUP))
4733                 printk(KERN_WARNING DRV_NAME
4734                        ": Warning: fail_over_mac only affects "
4735                        "active-backup mode.\n");
4736
4737         /* fill params struct with the proper values */
4738         params->mode = bond_mode;
4739         params->xmit_policy = xmit_hashtype;
4740         params->miimon = miimon;
4741         params->arp_interval = arp_interval;
4742         params->arp_validate = arp_validate_value;
4743         params->updelay = updelay;
4744         params->downdelay = downdelay;
4745         params->use_carrier = use_carrier;
4746         params->lacp_fast = lacp_fast;
4747         params->primary[0] = 0;
4748         params->fail_over_mac = fail_over_mac;
4749
4750         if (primary) {
4751                 strncpy(params->primary, primary, IFNAMSIZ);
4752                 params->primary[IFNAMSIZ - 1] = 0;
4753         }
4754
4755         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4756
4757         return 0;
4758 }
4759
4760 static struct lock_class_key bonding_netdev_xmit_lock_key;
4761
4762 /* Create a new bond based on the specified name and bonding parameters.
4763  * If name is NULL, obtain a suitable "bond%d" name for us.
4764  * Caller must NOT hold rtnl_lock; we need to release it here before we
4765  * set up our sysfs entries.
4766  */
4767 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4768 {
4769         struct net_device *bond_dev;
4770         int res;
4771
4772         rtnl_lock();
4773         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4774                                 ether_setup);
4775         if (!bond_dev) {
4776                 printk(KERN_ERR DRV_NAME
4777                        ": %s: eek! can't alloc netdev!\n",
4778                        name);
4779                 res = -ENOMEM;
4780                 goto out_rtnl;
4781         }
4782
4783         if (!name) {
4784                 res = dev_alloc_name(bond_dev, "bond%d");
4785                 if (res < 0)
4786                         goto out_netdev;
4787         }
4788
4789         /* bond_init() must be called after dev_alloc_name() (for the
4790          * /proc files), but before register_netdevice(), because we
4791          * need to set function pointers.
4792          */
4793
4794         res = bond_init(bond_dev, params);
4795         if (res < 0) {
4796                 goto out_netdev;
4797         }
4798
4799         res = register_netdevice(bond_dev);
4800         if (res < 0) {
4801                 goto out_bond;
4802         }
4803
4804         lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4805
4806         if (newbond)
4807                 *newbond = bond_dev->priv;
4808
4809         netif_carrier_off(bond_dev);
4810
4811         rtnl_unlock(); /* allows sysfs registration of net device */
4812         res = bond_create_sysfs_entry(bond_dev->priv);
4813         if (res < 0) {
4814                 rtnl_lock();
4815                 goto out_bond;
4816         }
4817
4818         return 0;
4819
4820 out_bond:
4821         bond_deinit(bond_dev);
4822 out_netdev:
4823         free_netdev(bond_dev);
4824 out_rtnl:
4825         rtnl_unlock();
4826         return res;
4827 }
4828
4829 static int __init bonding_init(void)
4830 {
4831         int i;
4832         int res;
4833
4834         printk(KERN_INFO "%s", version);
4835
4836         res = bond_check_params(&bonding_defaults);
4837         if (res) {
4838                 goto out;
4839         }
4840
4841 #ifdef CONFIG_PROC_FS
4842         bond_create_proc_dir();
4843 #endif
4844         for (i = 0; i < max_bonds; i++) {
4845                 res = bond_create(NULL, &bonding_defaults, NULL);
4846                 if (res)
4847                         goto err;
4848         }
4849
4850         res = bond_create_sysfs();
4851         if (res)
4852                 goto err;
4853
4854         register_netdevice_notifier(&bond_netdev_notifier);
4855         register_inetaddr_notifier(&bond_inetaddr_notifier);
4856
4857         goto out;
4858 err:
4859         rtnl_lock();
4860         bond_free_all();
4861         bond_destroy_sysfs();
4862         rtnl_unlock();
4863 out:
4864         return res;
4865
4866 }
4867
4868 static void __exit bonding_exit(void)
4869 {
4870         unregister_netdevice_notifier(&bond_netdev_notifier);
4871         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4872
4873         rtnl_lock();
4874         bond_free_all();
4875         bond_destroy_sysfs();
4876         rtnl_unlock();
4877 }
4878
4879 module_init(bonding_init);
4880 module_exit(bonding_exit);
4881 MODULE_LICENSE("GPL");
4882 MODULE_VERSION(DRV_VERSION);
4883 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4884 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4885 MODULE_SUPPORTED_DEVICE("most ethernet devices");
4886
4887 /*
4888  * Local variables:
4889  *  c-indent-level: 8
4890  *  c-basic-offset: 8
4891  *  tab-width: 8
4892  * End:
4893  */
4894