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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  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 <linux/io.h>
  57 #include <asm/system.h>
  58 #include <asm/dma.h>
  59 #include <linux/uaccess.h>
  60 #include <linux/errno.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/netpoll.h>
  63 #include <linux/inetdevice.h>
  64 #include <linux/igmp.h>
  65 #include <linux/etherdevice.h>
  66 #include <linux/skbuff.h>
  67 #include <net/sock.h>
  68 #include <linux/rtnetlink.h>
  69 #include <linux/proc_fs.h>
  70 #include <linux/seq_file.h>
  71 #include <linux/smp.h>
  72 #include <linux/if_ether.h>
  73 #include <net/arp.h>
  74 #include <linux/mii.h>
  75 #include <linux/ethtool.h>
  76 #include <linux/if_vlan.h>
  77 #include <linux/if_bonding.h>
  78 #include <linux/jiffies.h>
  79 #include <net/route.h>
  80 #include <net/net_namespace.h>
  81 #include <net/netns/generic.h>
  82 #include "bonding.h"
  83 #include "bond_3ad.h"
  84 #include "bond_alb.h"
  85
  86 /*---------------------------- Module parameters ----------------------------*/
  87
  88 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  89 #define BOND_LINK_MON_INTERV    0
  90 #define BOND_LINK_ARP_INTERV    0
  91
  92 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  93 static int num_grat_arp = 1;
  94 static int num_unsol_na = 1;
  95 static int miimon       = BOND_LINK_MON_INTERV;
  96 static int updelay;
  97 static int downdelay;
  98 static int use_carrier  = 1;
  99 static char *mode;
 100 static char *primary;
 101 static char *primary_reselect;
 102 static char *lacp_rate;
 103 static char *ad_select;
 104 static char *xmit_hash_policy;
 105 static int arp_interval = BOND_LINK_ARP_INTERV;
 106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 107 static char *arp_validate;
 108 static char *fail_over_mac;
 109 static struct bond_params bonding_defaults;
 110
 111 module_param(max_bonds, int, 0);
 112 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 113 module_param(num_grat_arp, int, 0644);
 114 MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
 115 module_param(num_unsol_na, int, 0644);
 116 MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
 117 module_param(miimon, int, 0);
 118 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 119 module_param(updelay, int, 0);
 120 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 121 module_param(downdelay, int, 0);
 122 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 123                             "in milliseconds");
 124 module_param(use_carrier, int, 0);
 125 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 126                               "0 for off, 1 for on (default)");
 127 module_param(mode, charp, 0);
 128 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 129                        "1 for active-backup, 2 for balance-xor, "
 130                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 131                        "6 for balance-alb");
 132 module_param(primary, charp, 0);
 133 MODULE_PARM_DESC(primary, "Primary network device to use");
 134 module_param(primary_reselect, charp, 0);
 135 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 136                                    "once it comes up; "
 137                                    "0 for always (default), "
 138                                    "1 for only if speed of primary is "
 139                                    "better, "
 140                                    "2 for only on active slave "
 141                                    "failure");
 142 module_param(lacp_rate, charp, 0);
 143 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 144                             "(slow/fast)");
 145 module_param(ad_select, charp, 0);
 146 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
 147 module_param(xmit_hash_policy, charp, 0);
 148 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 149                                    ", 1 for layer 3+4");
 150 module_param(arp_interval, int, 0);
 151 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 152 module_param_array(arp_ip_target, charp, NULL, 0);
 153 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 154 module_param(arp_validate, charp, 0);
 155 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 156 module_param(fail_over_mac, charp, 0);
 157 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
 158
 159 /*----------------------------- Global variables ----------------------------*/
 160
 161 static const char * const version =
 162         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 163
 164 int bond_net_id __read_mostly;
 165
 166 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 167 static int arp_ip_count;
 168 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 169 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 170 static int lacp_fast;
 171 static int disable_netpoll = 1;
 172
 173 const struct bond_parm_tbl bond_lacp_tbl[] = {
 174 {       "slow",         AD_LACP_SLOW},
 175 {       "fast",         AD_LACP_FAST},
 176 {       NULL,           -1},
 177 };
 178
 179 const struct bond_parm_tbl bond_mode_tbl[] = {
 180 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 181 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 182 {       "balance-xor",          BOND_MODE_XOR},
 183 {       "broadcast",            BOND_MODE_BROADCAST},
 184 {       "802.3ad",              BOND_MODE_8023AD},
 185 {       "balance-tlb",          BOND_MODE_TLB},
 186 {       "balance-alb",          BOND_MODE_ALB},
 187 {       NULL,                   -1},
 188 };
 189
 190 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 191 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 192 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 193 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 194 {       NULL,                   -1},
 195 };
 196
 197 const struct bond_parm_tbl arp_validate_tbl[] = {
 198 {       "none",                 BOND_ARP_VALIDATE_NONE},
 199 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 200 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 201 {       "all",                  BOND_ARP_VALIDATE_ALL},
 202 {       NULL,                   -1},
 203 };
 204
 205 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 206 {       "none",                 BOND_FOM_NONE},
 207 {       "active",               BOND_FOM_ACTIVE},
 208 {       "follow",               BOND_FOM_FOLLOW},
 209 {       NULL,                   -1},
 210 };
 211
 212 const struct bond_parm_tbl pri_reselect_tbl[] = {
 213 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 214 {       "better",               BOND_PRI_RESELECT_BETTER},
 215 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 216 {       NULL,                   -1},
 217 };
 218
 219 struct bond_parm_tbl ad_select_tbl[] = {
 220 {       "stable",       BOND_AD_STABLE},
 221 {       "bandwidth",    BOND_AD_BANDWIDTH},
 222 {       "count",        BOND_AD_COUNT},
 223 {       NULL,           -1},
 224 };
 225
 226 /*-------------------------- Forward declarations ---------------------------*/
 227
 228 static void bond_send_gratuitous_arp(struct bonding *bond);
 229 static int bond_init(struct net_device *bond_dev);
 230 static void bond_uninit(struct net_device *bond_dev);
 231
 232 /*---------------------------- General routines -----------------------------*/
 233
 234 static const char *bond_mode_name(int mode)
 235 {
 236         static const char *names[] = {
 237                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 238                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 239                 [BOND_MODE_XOR] = "load balancing (xor)",
 240                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 241                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 242                 [BOND_MODE_TLB] = "transmit load balancing",
 243                 [BOND_MODE_ALB] = "adaptive load balancing",
 244         };
 245
 246         if (mode < 0 || mode > BOND_MODE_ALB)
 247                 return "unknown";
 248
 249         return names[mode];
 250 }
 251
 252 /*---------------------------------- VLAN -----------------------------------*/
 253
 254 /**
 255  * bond_add_vlan - add a new vlan id on bond
 256  * @bond: bond that got the notification
 257  * @vlan_id: the vlan id to add
 258  *
 259  * Returns -ENOMEM if allocation failed.
 260  */
 261 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 262 {
 263         struct vlan_entry *vlan;
 264
 265         pr_debug("bond: %s, vlan id %d\n",
 266                  (bond ? bond->dev->name : "None"), vlan_id);
 267
 268         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 269         if (!vlan)
 270                 return -ENOMEM;
 271
 272         INIT_LIST_HEAD(&vlan->vlan_list);
 273         vlan->vlan_id = vlan_id;
 274
 275         write_lock_bh(&bond->lock);
 276
 277         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 278
 279         write_unlock_bh(&bond->lock);
 280
 281         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 282
 283         return 0;
 284 }
 285
 286 /**
 287  * bond_del_vlan - delete a vlan id from bond
 288  * @bond: bond that got the notification
 289  * @vlan_id: the vlan id to delete
 290  *
 291  * returns -ENODEV if @vlan_id was not found in @bond.
 292  */
 293 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 294 {
 295         struct vlan_entry *vlan;
 296         int res = -ENODEV;
 297
 298         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 299
 300         write_lock_bh(&bond->lock);
 301
 302         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 303                 if (vlan->vlan_id == vlan_id) {
 304                         list_del(&vlan->vlan_list);
 305
 306                         if (bond_is_lb(bond))
 307                                 bond_alb_clear_vlan(bond, vlan_id);
 308
 309                         pr_debug("removed VLAN ID %d from bond %s\n",
 310                                  vlan_id, bond->dev->name);
 311
 312                         kfree(vlan);
 313
 314                         if (list_empty(&bond->vlan_list) &&
 315                             (bond->slave_cnt == 0)) {
 316                                 /* Last VLAN removed and no slaves, so
 317                                  * restore block on adding VLANs. This will
 318                                  * be removed once new slaves that are not
 319                                  * VLAN challenged will be added.
 320                                  */
 321                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 322                         }
 323
 324                         res = 0;
 325                         goto out;
 326                 }
 327         }
 328
 329         pr_debug("couldn't find VLAN ID %d in bond %s\n",
 330                  vlan_id, bond->dev->name);
 331
 332 out:
 333         write_unlock_bh(&bond->lock);
 334         return res;
 335 }
 336
 337 /**
 338  * bond_has_challenged_slaves
 339  * @bond: the bond we're working on
 340  *
 341  * Searches the slave list. Returns 1 if a vlan challenged slave
 342  * was found, 0 otherwise.
 343  *
 344  * Assumes bond->lock is held.
 345  */
 346 static int bond_has_challenged_slaves(struct bonding *bond)
 347 {
 348         struct slave *slave;
 349         int i;
 350
 351         bond_for_each_slave(bond, slave, i) {
 352                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 353                         pr_debug("found VLAN challenged slave - %s\n",
 354                                  slave->dev->name);
 355                         return 1;
 356                 }
 357         }
 358
 359         pr_debug("no VLAN challenged slaves found\n");
 360         return 0;
 361 }
 362
 363 /**
 364  * bond_next_vlan - safely skip to the next item in the vlans list.
 365  * @bond: the bond we're working on
 366  * @curr: item we're advancing from
 367  *
 368  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 369  * or @curr->next otherwise (even if it is @curr itself again).
 370  *
 371  * Caller must hold bond->lock
 372  */
 373 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 374 {
 375         struct vlan_entry *next, *last;
 376
 377         if (list_empty(&bond->vlan_list))
 378                 return NULL;
 379
 380         if (!curr) {
 381                 next = list_entry(bond->vlan_list.next,
 382                                   struct vlan_entry, vlan_list);
 383         } else {
 384                 last = list_entry(bond->vlan_list.prev,
 385                                   struct vlan_entry, vlan_list);
 386                 if (last == curr) {
 387                         next = list_entry(bond->vlan_list.next,
 388                                           struct vlan_entry, vlan_list);
 389                 } else {
 390                         next = list_entry(curr->vlan_list.next,
 391                                           struct vlan_entry, vlan_list);
 392                 }
 393         }
 394
 395         return next;
 396 }
 397
 398 /**
 399  * bond_dev_queue_xmit - Prepare skb for xmit.
 400  *
 401  * @bond: bond device that got this skb for tx.
 402  * @skb: hw accel VLAN tagged skb to transmit
 403  * @slave_dev: slave that is supposed to xmit this skbuff
 404  *
 405  * When the bond gets an skb to transmit that is
 406  * already hardware accelerated VLAN tagged, and it
 407  * needs to relay this skb to a slave that is not
 408  * hw accel capable, the skb needs to be "unaccelerated",
 409  * i.e. strip the hwaccel tag and re-insert it as part
 410  * of the payload.
 411  */
 412 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 413                         struct net_device *slave_dev)
 414 {
 415         unsigned short uninitialized_var(vlan_id);
 416
 417         if (!list_empty(&bond->vlan_list) &&
 418             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 419             vlan_get_tag(skb, &vlan_id) == 0) {
 420                 skb->dev = slave_dev;
 421                 skb = vlan_put_tag(skb, vlan_id);
 422                 if (!skb) {
 423                         /* vlan_put_tag() frees the skb in case of error,
 424                          * so return success here so the calling functions
 425                          * won't attempt to free is again.
 426                          */
 427                         return 0;
 428                 }
 429         } else {
 430                 skb->dev = slave_dev;
 431         }
 432
 433         skb->priority = 1;
 434 #ifdef CONFIG_NET_POLL_CONTROLLER
 435         if (unlikely(bond->dev->priv_flags & IFF_IN_NETPOLL)) {
 436                 struct netpoll *np = bond->dev->npinfo->netpoll;
 437                 slave_dev->npinfo = bond->dev->npinfo;
 438                 np->real_dev = np->dev = skb->dev;
 439                 slave_dev->priv_flags |= IFF_IN_NETPOLL;
 440                 netpoll_send_skb(np, skb);
 441                 slave_dev->priv_flags &= ~IFF_IN_NETPOLL;
 442                 np->dev = bond->dev;
 443         } else
 444 #endif
 445                 dev_queue_xmit(skb);
 446
 447         return 0;
 448 }
 449
 450 /*
 451  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 452  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 453  * lock because:
 454  * a. This operation is performed in IOCTL context,
 455  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 456  * c. Holding a lock with BH disabled while directly calling a base driver
 457  *    entry point is generally a BAD idea.
 458  *
 459  * The design of synchronization/protection for this operation in the 8021q
 460  * module is good for one or more VLAN devices over a single physical device
 461  * and cannot be extended for a teaming solution like bonding, so there is a
 462  * potential race condition here where a net device from the vlan group might
 463  * be referenced (either by a base driver or the 8021q code) while it is being
 464  * removed from the system. However, it turns out we're not making matters
 465  * worse, and if it works for regular VLAN usage it will work here too.
 466 */
 467
 468 /**
 469  * bond_vlan_rx_register - Propagates registration to slaves
 470  * @bond_dev: bonding net device that got called
 471  * @grp: vlan group being registered
 472  */
 473 static void bond_vlan_rx_register(struct net_device *bond_dev,
 474                                   struct vlan_group *grp)
 475 {
 476         struct bonding *bond = netdev_priv(bond_dev);
 477         struct slave *slave;
 478         int i;
 479
 480         bond->vlgrp = grp;
 481
 482         bond_for_each_slave(bond, slave, i) {
 483                 struct net_device *slave_dev = slave->dev;
 484                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 485
 486                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 487                     slave_ops->ndo_vlan_rx_register) {
 488                         slave_ops->ndo_vlan_rx_register(slave_dev, grp);
 489                 }
 490         }
 491 }
 492
 493 /**
 494  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 495  * @bond_dev: bonding net device that got called
 496  * @vid: vlan id being added
 497  */
 498 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 499 {
 500         struct bonding *bond = netdev_priv(bond_dev);
 501         struct slave *slave;
 502         int i, res;
 503
 504         bond_for_each_slave(bond, slave, i) {
 505                 struct net_device *slave_dev = slave->dev;
 506                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 507
 508                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 509                     slave_ops->ndo_vlan_rx_add_vid) {
 510                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
 511                 }
 512         }
 513
 514         res = bond_add_vlan(bond, vid);
 515         if (res) {
 516                 pr_err("%s: Error: Failed to add vlan id %d\n",
 517                        bond_dev->name, vid);
 518         }
 519 }
 520
 521 /**
 522  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 523  * @bond_dev: bonding net device that got called
 524  * @vid: vlan id being removed
 525  */
 526 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 527 {
 528         struct bonding *bond = netdev_priv(bond_dev);
 529         struct slave *slave;
 530         struct net_device *vlan_dev;
 531         int i, res;
 532
 533         bond_for_each_slave(bond, slave, i) {
 534                 struct net_device *slave_dev = slave->dev;
 535                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 536
 537                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 538                     slave_ops->ndo_vlan_rx_kill_vid) {
 539                         /* Save and then restore vlan_dev in the grp array,
 540                          * since the slave's driver might clear it.
 541                          */
 542                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
 543                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
 544                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
 545                 }
 546         }
 547
 548         res = bond_del_vlan(bond, vid);
 549         if (res) {
 550                 pr_err("%s: Error: Failed to remove vlan id %d\n",
 551                        bond_dev->name, vid);
 552         }
 553 }
 554
 555 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 556 {
 557         struct vlan_entry *vlan;
 558         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 559
 560         write_lock_bh(&bond->lock);
 561
 562         if (list_empty(&bond->vlan_list))
 563                 goto out;
 564
 565         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 566             slave_ops->ndo_vlan_rx_register)
 567                 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
 568
 569         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 570             !(slave_ops->ndo_vlan_rx_add_vid))
 571                 goto out;
 572
 573         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
 574                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 575
 576 out:
 577         write_unlock_bh(&bond->lock);
 578 }
 579
 580 static void bond_del_vlans_from_slave(struct bonding *bond,
 581                                       struct net_device *slave_dev)
 582 {
 583         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 584         struct vlan_entry *vlan;
 585         struct net_device *vlan_dev;
 586
 587         write_lock_bh(&bond->lock);
 588
 589         if (list_empty(&bond->vlan_list))
 590                 goto out;
 591
 592         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 593             !(slave_ops->ndo_vlan_rx_kill_vid))
 594                 goto unreg;
 595
 596         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 597                 /* Save and then restore vlan_dev in the grp array,
 598                  * since the slave's driver might clear it.
 599                  */
 600                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
 601                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 602                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
 603         }
 604
 605 unreg:
 606         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 607             slave_ops->ndo_vlan_rx_register)
 608                 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
 609
 610 out:
 611         write_unlock_bh(&bond->lock);
 612 }
 613
 614 /*------------------------------- Link status -------------------------------*/
 615
 616 /*
 617  * Set the carrier state for the master according to the state of its
 618  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 619  * do special 802.3ad magic.
 620  *
 621  * Returns zero if carrier state does not change, nonzero if it does.
 622  */
 623 static int bond_set_carrier(struct bonding *bond)
 624 {
 625         struct slave *slave;
 626         int i;
 627
 628         if (bond->slave_cnt == 0)
 629                 goto down;
 630
 631         if (bond->params.mode == BOND_MODE_8023AD)
 632                 return bond_3ad_set_carrier(bond);
 633
 634         bond_for_each_slave(bond, slave, i) {
 635                 if (slave->link == BOND_LINK_UP) {
 636                         if (!netif_carrier_ok(bond->dev)) {
 637                                 netif_carrier_on(bond->dev);
 638                                 return 1;
 639                         }
 640                         return 0;
 641                 }
 642         }
 643
 644 down:
 645         if (netif_carrier_ok(bond->dev)) {
 646                 netif_carrier_off(bond->dev);
 647                 return 1;
 648         }
 649         return 0;
 650 }
 651
 652 /*
 653  * Get link speed and duplex from the slave's base driver
 654  * using ethtool. If for some reason the call fails or the
 655  * values are invalid, fake speed and duplex to 100/Full
 656  * and return error.
 657  */
 658 static int bond_update_speed_duplex(struct slave *slave)
 659 {
 660         struct net_device *slave_dev = slave->dev;
 661         struct ethtool_cmd etool;
 662         int res;
 663
 664         /* Fake speed and duplex */
 665         slave->speed = SPEED_100;
 666         slave->duplex = DUPLEX_FULL;
 667
 668         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
 669                 return -1;
 670
 671         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 672         if (res < 0)
 673                 return -1;
 674
 675         switch (etool.speed) {
 676         case SPEED_10:
 677         case SPEED_100:
 678         case SPEED_1000:
 679         case SPEED_10000:
 680                 break;
 681         default:
 682                 return -1;
 683         }
 684
 685         switch (etool.duplex) {
 686         case DUPLEX_FULL:
 687         case DUPLEX_HALF:
 688                 break;
 689         default:
 690                 return -1;
 691         }
 692
 693         slave->speed = etool.speed;
 694         slave->duplex = etool.duplex;
 695
 696         return 0;
 697 }
 698
 699 /*
 700  * if <dev> supports MII link status reporting, check its link status.
 701  *
 702  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 703  * depending upon the setting of the use_carrier parameter.
 704  *
 705  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 706  * can't tell and just pretend it is), or 0, meaning that the link is
 707  * down.
 708  *
 709  * If reporting is non-zero, instead of faking link up, return -1 if
 710  * both ETHTOOL and MII ioctls fail (meaning the device does not
 711  * support them).  If use_carrier is set, return whatever it says.
 712  * It'd be nice if there was a good way to tell if a driver supports
 713  * netif_carrier, but there really isn't.
 714  */
 715 static int bond_check_dev_link(struct bonding *bond,
 716                                struct net_device *slave_dev, int reporting)
 717 {
 718         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 719         int (*ioctl)(struct net_device *, struct ifreq *, int);
 720         struct ifreq ifr;
 721         struct mii_ioctl_data *mii;
 722
 723         if (!reporting && !netif_running(slave_dev))
 724                 return 0;
 725
 726         if (bond->params.use_carrier)
 727                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 728
 729         /* Try to get link status using Ethtool first. */
 730         if (slave_dev->ethtool_ops) {
 731                 if (slave_dev->ethtool_ops->get_link) {
 732                         u32 link;
 733
 734                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 735
 736                         return link ? BMSR_LSTATUS : 0;
 737                 }
 738         }
 739
 740         /* Ethtool can't be used, fallback to MII ioctls. */
 741         ioctl = slave_ops->ndo_do_ioctl;
 742         if (ioctl) {
 743                 /* TODO: set pointer to correct ioctl on a per team member */
 744                 /*       bases to make this more efficient. that is, once  */
 745                 /*       we determine the correct ioctl, we will always    */
 746                 /*       call it and not the others for that team          */
 747                 /*       member.                                           */
 748
 749                 /*
 750                  * We cannot assume that SIOCGMIIPHY will also read a
 751                  * register; not all network drivers (e.g., e100)
 752                  * support that.
 753                  */
 754
 755                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 756                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 757                 mii = if_mii(&ifr);
 758                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 759                         mii->reg_num = MII_BMSR;
 760                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 761                                 return mii->val_out & BMSR_LSTATUS;
 762                 }
 763         }
 764
 765         /*
 766          * If reporting, report that either there's no dev->do_ioctl,
 767          * or both SIOCGMIIREG and get_link failed (meaning that we
 768          * cannot report link status).  If not reporting, pretend
 769          * we're ok.
 770          */
 771         return reporting ? -1 : BMSR_LSTATUS;
 772 }
 773
 774 /*----------------------------- Multicast list ------------------------------*/
 775
 776 /*
 777  * Push the promiscuity flag down to appropriate slaves
 778  */
 779 static int bond_set_promiscuity(struct bonding *bond, int inc)
 780 {
 781         int err = 0;
 782         if (USES_PRIMARY(bond->params.mode)) {
 783                 /* write lock already acquired */
 784                 if (bond->curr_active_slave) {
 785                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 786                                                   inc);
 787                 }
 788         } else {
 789                 struct slave *slave;
 790                 int i;
 791                 bond_for_each_slave(bond, slave, i) {
 792                         err = dev_set_promiscuity(slave->dev, inc);
 793                         if (err)
 794                                 return err;
 795                 }
 796         }
 797         return err;
 798 }
 799
 800 /*
 801  * Push the allmulti flag down to all slaves
 802  */
 803 static int bond_set_allmulti(struct bonding *bond, int inc)
 804 {
 805         int err = 0;
 806         if (USES_PRIMARY(bond->params.mode)) {
 807                 /* write lock already acquired */
 808                 if (bond->curr_active_slave) {
 809                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 810                                                inc);
 811                 }
 812         } else {
 813                 struct slave *slave;
 814                 int i;
 815                 bond_for_each_slave(bond, slave, i) {
 816                         err = dev_set_allmulti(slave->dev, inc);
 817                         if (err)
 818                                 return err;
 819                 }
 820         }
 821         return err;
 822 }
 823
 824 /*
 825  * Add a Multicast address to slaves
 826  * according to mode
 827  */
 828 static void bond_mc_add(struct bonding *bond, void *addr)
 829 {
 830         if (USES_PRIMARY(bond->params.mode)) {
 831                 /* write lock already acquired */
 832                 if (bond->curr_active_slave)
 833                         dev_mc_add(bond->curr_active_slave->dev, addr);
 834         } else {
 835                 struct slave *slave;
 836                 int i;
 837
 838                 bond_for_each_slave(bond, slave, i)
 839                         dev_mc_add(slave->dev, addr);
 840         }
 841 }
 842
 843 /*
 844  * Remove a multicast address from slave
 845  * according to mode
 846  */
 847 static void bond_mc_del(struct bonding *bond, void *addr)
 848 {
 849         if (USES_PRIMARY(bond->params.mode)) {
 850                 /* write lock already acquired */
 851                 if (bond->curr_active_slave)
 852                         dev_mc_del(bond->curr_active_slave->dev, addr);
 853         } else {
 854                 struct slave *slave;
 855                 int i;
 856                 bond_for_each_slave(bond, slave, i) {
 857                         dev_mc_del(slave->dev, addr);
 858                 }
 859         }
 860 }
 861
 862
 863 /*
 864  * Retrieve the list of registered multicast addresses for the bonding
 865  * device and retransmit an IGMP JOIN request to the current active
 866  * slave.
 867  */
 868 static void bond_resend_igmp_join_requests(struct bonding *bond)
 869 {
 870         struct in_device *in_dev;
 871         struct ip_mc_list *im;
 872
 873         rcu_read_lock();
 874         in_dev = __in_dev_get_rcu(bond->dev);
 875         if (in_dev) {
 876                 for (im = in_dev->mc_list; im; im = im->next)
 877                         ip_mc_rejoin_group(im);
 878         }
 879
 880         rcu_read_unlock();
 881 }
 882
 883 /*
 884  * flush all members of flush->mc_list from device dev->mc_list
 885  */
 886 static void bond_mc_list_flush(struct net_device *bond_dev,
 887                                struct net_device *slave_dev)
 888 {
 889         struct bonding *bond = netdev_priv(bond_dev);
 890         struct netdev_hw_addr *ha;
 891
 892         netdev_for_each_mc_addr(ha, bond_dev)
 893                 dev_mc_del(slave_dev, ha->addr);
 894
 895         if (bond->params.mode == BOND_MODE_8023AD) {
 896                 /* del lacpdu mc addr from mc list */
 897                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 898
 899                 dev_mc_del(slave_dev, lacpdu_multicast);
 900         }
 901 }
 902
 903 /*--------------------------- Active slave change ---------------------------*/
 904
 905 /*
 906  * Update the mc list and multicast-related flags for the new and
 907  * old active slaves (if any) according to the multicast mode, and
 908  * promiscuous flags unconditionally.
 909  */
 910 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
 911                          struct slave *old_active)
 912 {
 913         struct netdev_hw_addr *ha;
 914
 915         if (!USES_PRIMARY(bond->params.mode))
 916                 /* nothing to do -  mc list is already up-to-date on
 917                  * all slaves
 918                  */
 919                 return;
 920
 921         if (old_active) {
 922                 if (bond->dev->flags & IFF_PROMISC)
 923                         dev_set_promiscuity(old_active->dev, -1);
 924
 925                 if (bond->dev->flags & IFF_ALLMULTI)
 926                         dev_set_allmulti(old_active->dev, -1);
 927
 928                 netdev_for_each_mc_addr(ha, bond->dev)
 929                         dev_mc_del(old_active->dev, ha->addr);
 930         }
 931
 932         if (new_active) {
 933                 /* FIXME: Signal errors upstream. */
 934                 if (bond->dev->flags & IFF_PROMISC)
 935                         dev_set_promiscuity(new_active->dev, 1);
 936
 937                 if (bond->dev->flags & IFF_ALLMULTI)
 938                         dev_set_allmulti(new_active->dev, 1);
 939
 940                 netdev_for_each_mc_addr(ha, bond->dev)
 941                         dev_mc_add(new_active->dev, ha->addr);
 942                 bond_resend_igmp_join_requests(bond);
 943         }
 944 }
 945
 946 /*
 947  * bond_do_fail_over_mac
 948  *
 949  * Perform special MAC address swapping for fail_over_mac settings
 950  *
 951  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 952  */
 953 static void bond_do_fail_over_mac(struct bonding *bond,
 954                                   struct slave *new_active,
 955                                   struct slave *old_active)
 956         __releases(&bond->curr_slave_lock)
 957         __releases(&bond->lock)
 958         __acquires(&bond->lock)
 959         __acquires(&bond->curr_slave_lock)
 960 {
 961         u8 tmp_mac[ETH_ALEN];
 962         struct sockaddr saddr;
 963         int rv;
 964
 965         switch (bond->params.fail_over_mac) {
 966         case BOND_FOM_ACTIVE:
 967                 if (new_active)
 968                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
 969                                new_active->dev->addr_len);
 970                 break;
 971         case BOND_FOM_FOLLOW:
 972                 /*
 973                  * if new_active && old_active, swap them
 974                  * if just old_active, do nothing (going to no active slave)
 975                  * if just new_active, set new_active to bond's MAC
 976                  */
 977                 if (!new_active)
 978                         return;
 979
 980                 write_unlock_bh(&bond->curr_slave_lock);
 981                 read_unlock(&bond->lock);
 982
 983                 if (old_active) {
 984                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 985                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 986                                ETH_ALEN);
 987                         saddr.sa_family = new_active->dev->type;
 988                 } else {
 989                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 990                         saddr.sa_family = bond->dev->type;
 991                 }
 992
 993                 rv = dev_set_mac_address(new_active->dev, &saddr);
 994                 if (rv) {
 995                         pr_err("%s: Error %d setting MAC of slave %s\n",
 996                                bond->dev->name, -rv, new_active->dev->name);
 997                         goto out;
 998                 }
 999
1000                 if (!old_active)
1001                         goto out;
1002
1003                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1004                 saddr.sa_family = old_active->dev->type;
1005
1006                 rv = dev_set_mac_address(old_active->dev, &saddr);
1007                 if (rv)
1008                         pr_err("%s: Error %d setting MAC of slave %s\n",
1009                                bond->dev->name, -rv, new_active->dev->name);
1010 out:
1011                 read_lock(&bond->lock);
1012                 write_lock_bh(&bond->curr_slave_lock);
1013                 break;
1014         default:
1015                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
1016                        bond->dev->name, bond->params.fail_over_mac);
1017                 break;
1018         }
1019
1020 }
1021
1022 static bool bond_should_change_active(struct bonding *bond)
1023 {
1024         struct slave *prim = bond->primary_slave;
1025         struct slave *curr = bond->curr_active_slave;
1026
1027         if (!prim || !curr || curr->link != BOND_LINK_UP)
1028                 return true;
1029         if (bond->force_primary) {
1030                 bond->force_primary = false;
1031                 return true;
1032         }
1033         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
1034             (prim->speed < curr->speed ||
1035              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
1036                 return false;
1037         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
1038                 return false;
1039         return true;
1040 }
1041
1042 /**
1043  * find_best_interface - select the best available slave to be the active one
1044  * @bond: our bonding struct
1045  *
1046  * Warning: Caller must hold curr_slave_lock for writing.
1047  */
1048 static struct slave *bond_find_best_slave(struct bonding *bond)
1049 {
1050         struct slave *new_active, *old_active;
1051         struct slave *bestslave = NULL;
1052         int mintime = bond->params.updelay;
1053         int i;
1054
1055         new_active = bond->curr_active_slave;
1056
1057         if (!new_active) { /* there were no active slaves left */
1058                 if (bond->slave_cnt > 0)   /* found one slave */
1059                         new_active = bond->first_slave;
1060                 else
1061                         return NULL; /* still no slave, return NULL */
1062         }
1063
1064         if ((bond->primary_slave) &&
1065             bond->primary_slave->link == BOND_LINK_UP &&
1066             bond_should_change_active(bond)) {
1067                 new_active = bond->primary_slave;
1068         }
1069
1070         /* remember where to stop iterating over the slaves */
1071         old_active = new_active;
1072
1073         bond_for_each_slave_from(bond, new_active, i, old_active) {
1074                 if (new_active->link == BOND_LINK_UP) {
1075                         return new_active;
1076                 } else if (new_active->link == BOND_LINK_BACK &&
1077                            IS_UP(new_active->dev)) {
1078                         /* link up, but waiting for stabilization */
1079                         if (new_active->delay < mintime) {
1080                                 mintime = new_active->delay;
1081                                 bestslave = new_active;
1082                         }
1083                 }
1084         }
1085
1086         return bestslave;
1087 }
1088
1089 /**
1090  * change_active_interface - change the active slave into the specified one
1091  * @bond: our bonding struct
1092  * @new: the new slave to make the active one
1093  *
1094  * Set the new slave to the bond's settings and unset them on the old
1095  * curr_active_slave.
1096  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1097  *
1098  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1099  * because it is apparently the best available slave we have, even though its
1100  * updelay hasn't timed out yet.
1101  *
1102  * If new_active is not NULL, caller must hold bond->lock for read and
1103  * curr_slave_lock for write_bh.
1104  */
1105 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1106 {
1107         struct slave *old_active = bond->curr_active_slave;
1108
1109         if (old_active == new_active)
1110                 return;
1111
1112         if (new_active) {
1113                 new_active->jiffies = jiffies;
1114
1115                 if (new_active->link == BOND_LINK_BACK) {
1116                         if (USES_PRIMARY(bond->params.mode)) {
1117                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1118                                         bond->dev->name, new_active->dev->name,
1119                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1120                         }
1121
1122                         new_active->delay = 0;
1123                         new_active->link = BOND_LINK_UP;
1124
1125                         if (bond->params.mode == BOND_MODE_8023AD)
1126                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1127
1128                         if (bond_is_lb(bond))
1129                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1130                 } else {
1131                         if (USES_PRIMARY(bond->params.mode)) {
1132                                 pr_info("%s: making interface %s the new active one.\n",
1133                                         bond->dev->name, new_active->dev->name);
1134                         }
1135                 }
1136         }
1137
1138         if (USES_PRIMARY(bond->params.mode))
1139                 bond_mc_swap(bond, new_active, old_active);
1140
1141         if (bond_is_lb(bond)) {
1142                 bond_alb_handle_active_change(bond, new_active);
1143                 if (old_active)
1144                         bond_set_slave_inactive_flags(old_active);
1145                 if (new_active)
1146                         bond_set_slave_active_flags(new_active);
1147         } else {
1148                 bond->curr_active_slave = new_active;
1149         }
1150
1151         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1152                 if (old_active)
1153                         bond_set_slave_inactive_flags(old_active);
1154
1155                 if (new_active) {
1156                         bond_set_slave_active_flags(new_active);
1157
1158                         if (bond->params.fail_over_mac)
1159                                 bond_do_fail_over_mac(bond, new_active,
1160                                                       old_active);
1161
1162                         bond->send_grat_arp = bond->params.num_grat_arp;
1163                         bond_send_gratuitous_arp(bond);
1164
1165                         bond->send_unsol_na = bond->params.num_unsol_na;
1166                         bond_send_unsolicited_na(bond);
1167
1168                         write_unlock_bh(&bond->curr_slave_lock);
1169                         read_unlock(&bond->lock);
1170
1171                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1172
1173                         read_lock(&bond->lock);
1174                         write_lock_bh(&bond->curr_slave_lock);
1175                 }
1176         }
1177
1178         /* resend IGMP joins since all were sent on curr_active_slave */
1179         if (bond->params.mode == BOND_MODE_ROUNDROBIN) {
1180                 bond_resend_igmp_join_requests(bond);
1181         }
1182 }
1183
1184 /**
1185  * bond_select_active_slave - select a new active slave, if needed
1186  * @bond: our bonding struct
1187  *
1188  * This functions should be called when one of the following occurs:
1189  * - The old curr_active_slave has been released or lost its link.
1190  * - The primary_slave has got its link back.
1191  * - A slave has got its link back and there's no old curr_active_slave.
1192  *
1193  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1194  */
1195 void bond_select_active_slave(struct bonding *bond)
1196 {
1197         struct slave *best_slave;
1198         int rv;
1199
1200         best_slave = bond_find_best_slave(bond);
1201         if (best_slave != bond->curr_active_slave) {
1202                 bond_change_active_slave(bond, best_slave);
1203                 rv = bond_set_carrier(bond);
1204                 if (!rv)
1205                         return;
1206
1207                 if (netif_carrier_ok(bond->dev)) {
1208                         pr_info("%s: first active interface up!\n",
1209                                 bond->dev->name);
1210                 } else {
1211                         pr_info("%s: now running without any active interface !\n",
1212                                 bond->dev->name);
1213                 }
1214         }
1215 }
1216
1217 /*--------------------------- slave list handling ---------------------------*/
1218
1219 /*
1220  * This function attaches the slave to the end of list.
1221  *
1222  * bond->lock held for writing by caller.
1223  */
1224 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1225 {
1226         if (bond->first_slave == NULL) { /* attaching the first slave */
1227                 new_slave->next = new_slave;
1228                 new_slave->prev = new_slave;
1229                 bond->first_slave = new_slave;
1230         } else {
1231                 new_slave->next = bond->first_slave;
1232                 new_slave->prev = bond->first_slave->prev;
1233                 new_slave->next->prev = new_slave;
1234                 new_slave->prev->next = new_slave;
1235         }
1236
1237         bond->slave_cnt++;
1238 }
1239
1240 /*
1241  * This function detaches the slave from the list.
1242  * WARNING: no check is made to verify if the slave effectively
1243  * belongs to <bond>.
1244  * Nothing is freed on return, structures are just unchained.
1245  * If any slave pointer in bond was pointing to <slave>,
1246  * it should be changed by the calling function.
1247  *
1248  * bond->lock held for writing by caller.
1249  */
1250 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1251 {
1252         if (slave->next)
1253                 slave->next->prev = slave->prev;
1254
1255         if (slave->prev)
1256                 slave->prev->next = slave->next;
1257
1258         if (bond->first_slave == slave) { /* slave is the first slave */
1259                 if (bond->slave_cnt > 1) { /* there are more slave */
1260                         bond->first_slave = slave->next;
1261                 } else {
1262                         bond->first_slave = NULL; /* slave was the last one */
1263                 }
1264         }
1265
1266         slave->next = NULL;
1267         slave->prev = NULL;
1268         bond->slave_cnt--;
1269 }
1270
1271 #ifdef CONFIG_NET_POLL_CONTROLLER
1272 /*
1273  * You must hold read lock on bond->lock before calling this.
1274  */
1275 static bool slaves_support_netpoll(struct net_device *bond_dev)
1276 {
1277         struct bonding *bond = netdev_priv(bond_dev);
1278         struct slave *slave;
1279         int i = 0;
1280         bool ret = true;
1281
1282         bond_for_each_slave(bond, slave, i) {
1283                 if ((slave->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
1284                     !slave->dev->netdev_ops->ndo_poll_controller)
1285                         ret = false;
1286         }
1287         return i != 0 && ret;
1288 }
1289
1290 static void bond_poll_controller(struct net_device *bond_dev)
1291 {
1292         struct net_device *dev = bond_dev->npinfo->netpoll->real_dev;
1293         if (dev != bond_dev)
1294                 netpoll_poll_dev(dev);
1295 }
1296
1297 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1298 {
1299         struct bonding *bond = netdev_priv(bond_dev);
1300         struct slave *slave;
1301         const struct net_device_ops *ops;
1302         int i;
1303
1304         read_lock(&bond->lock);
1305         bond_dev->npinfo = NULL;
1306         bond_for_each_slave(bond, slave, i) {
1307                 if (slave->dev) {
1308                         ops = slave->dev->netdev_ops;
1309                         if (ops->ndo_netpoll_cleanup)
1310                                 ops->ndo_netpoll_cleanup(slave->dev);
1311                         else
1312                                 slave->dev->npinfo = NULL;
1313                 }
1314         }
1315         read_unlock(&bond->lock);
1316 }
1317
1318 #else
1319
1320 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1321 {
1322 }
1323
1324 #endif
1325
1326 /*---------------------------------- IOCTL ----------------------------------*/
1327
1328 static int bond_sethwaddr(struct net_device *bond_dev,
1329                           struct net_device *slave_dev)
1330 {
1331         pr_debug("bond_dev=%p\n", bond_dev);
1332         pr_debug("slave_dev=%p\n", slave_dev);
1333         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1334         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1335         return 0;
1336 }
1337
1338 #define BOND_VLAN_FEATURES \
1339         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1340          NETIF_F_HW_VLAN_FILTER)
1341
1342 /*
1343  * Compute the common dev->feature set available to all slaves.  Some
1344  * feature bits are managed elsewhere, so preserve those feature bits
1345  * on the master device.
1346  */
1347 static int bond_compute_features(struct bonding *bond)
1348 {
1349         struct slave *slave;
1350         struct net_device *bond_dev = bond->dev;
1351         unsigned long features = bond_dev->features;
1352         unsigned long vlan_features = 0;
1353         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1354                                                 bond_dev->hard_header_len);
1355         int i;
1356
1357         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1358         features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1359
1360         if (!bond->first_slave)
1361                 goto done;
1362
1363         features &= ~NETIF_F_ONE_FOR_ALL;
1364
1365         vlan_features = bond->first_slave->dev->vlan_features;
1366         bond_for_each_slave(bond, slave, i) {
1367                 features = netdev_increment_features(features,
1368                                                      slave->dev->features,
1369                                                      NETIF_F_ONE_FOR_ALL);
1370                 vlan_features = netdev_increment_features(vlan_features,
1371                                                         slave->dev->vlan_features,
1372                                                         NETIF_F_ONE_FOR_ALL);
1373                 if (slave->dev->hard_header_len > max_hard_header_len)
1374                         max_hard_header_len = slave->dev->hard_header_len;
1375         }
1376
1377 done:
1378         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1379         bond_dev->features = netdev_fix_features(features, NULL);
1380         bond_dev->vlan_features = netdev_fix_features(vlan_features, NULL);
1381         bond_dev->hard_header_len = max_hard_header_len;
1382
1383         return 0;
1384 }
1385
1386 static void bond_setup_by_slave(struct net_device *bond_dev,
1387                                 struct net_device *slave_dev)
1388 {
1389         struct bonding *bond = netdev_priv(bond_dev);
1390
1391         bond_dev->header_ops        = slave_dev->header_ops;
1392
1393         bond_dev->type              = slave_dev->type;
1394         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1395         bond_dev->addr_len          = slave_dev->addr_len;
1396
1397         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1398                 slave_dev->addr_len);
1399         bond->setup_by_slave = 1;
1400 }
1401
1402 /* enslave device <slave> to bond device <master> */
1403 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1404 {
1405         struct bonding *bond = netdev_priv(bond_dev);
1406         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1407         struct slave *new_slave = NULL;
1408         struct netdev_hw_addr *ha;
1409         struct sockaddr addr;
1410         int link_reporting;
1411         int old_features = bond_dev->features;
1412         int res = 0;
1413
1414         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1415                 slave_ops->ndo_do_ioctl == NULL) {
1416                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1417                            bond_dev->name, slave_dev->name);
1418         }
1419
1420         /* bond must be initialized by bond_open() before enslaving */
1421         if (!(bond_dev->flags & IFF_UP)) {
1422                 pr_warning("%s: master_dev is not up in bond_enslave\n",
1423                            bond_dev->name);
1424         }
1425
1426         /* already enslaved */
1427         if (slave_dev->flags & IFF_SLAVE) {
1428                 pr_debug("Error, Device was already enslaved\n");
1429                 return -EBUSY;
1430         }
1431
1432         /* vlan challenged mutual exclusion */
1433         /* no need to lock since we're protected by rtnl_lock */
1434         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1435                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1436                 if (!list_empty(&bond->vlan_list)) {
1437                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1438                                bond_dev->name, slave_dev->name, bond_dev->name);
1439                         return -EPERM;
1440                 } else {
1441                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1442                                    bond_dev->name, slave_dev->name,
1443                                    slave_dev->name, bond_dev->name);
1444                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1445                 }
1446         } else {
1447                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1448                 if (bond->slave_cnt == 0) {
1449                         /* First slave, and it is not VLAN challenged,
1450                          * so remove the block of adding VLANs over the bond.
1451                          */
1452                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1453                 }
1454         }
1455
1456         /*
1457          * Old ifenslave binaries are no longer supported.  These can
1458          * be identified with moderate accuracy by the state of the slave:
1459          * the current ifenslave will set the interface down prior to
1460          * enslaving it; the old ifenslave will not.
1461          */
1462         if ((slave_dev->flags & IFF_UP)) {
1463                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1464                        slave_dev->name);
1465                 res = -EPERM;
1466                 goto err_undo_flags;
1467         }
1468
1469         /* set bonding device ether type by slave - bonding netdevices are
1470          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1471          * there is a need to override some of the type dependent attribs/funcs.
1472          *
1473          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1474          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1475          */
1476         if (bond->slave_cnt == 0) {
1477                 if (bond_dev->type != slave_dev->type) {
1478                         pr_debug("%s: change device type from %d to %d\n",
1479                                  bond_dev->name,
1480                                  bond_dev->type, slave_dev->type);
1481
1482                         res = netdev_bonding_change(bond_dev,
1483                                                     NETDEV_PRE_TYPE_CHANGE);
1484                         res = notifier_to_errno(res);
1485                         if (res) {
1486                                 pr_err("%s: refused to change device type\n",
1487                                        bond_dev->name);
1488                                 res = -EBUSY;
1489                                 goto err_undo_flags;
1490                         }
1491
1492                         /* Flush unicast and multicast addresses */
1493                         dev_uc_flush(bond_dev);
1494                         dev_mc_flush(bond_dev);
1495
1496                         if (slave_dev->type != ARPHRD_ETHER)
1497                                 bond_setup_by_slave(bond_dev, slave_dev);
1498                         else
1499                                 ether_setup(bond_dev);
1500
1501                         netdev_bonding_change(bond_dev,
1502                                               NETDEV_POST_TYPE_CHANGE);
1503                 }
1504         } else if (bond_dev->type != slave_dev->type) {
1505                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1506                        slave_dev->name,
1507                        slave_dev->type, bond_dev->type);
1508                 res = -EINVAL;
1509                 goto err_undo_flags;
1510         }
1511
1512         if (slave_ops->ndo_set_mac_address == NULL) {
1513                 if (bond->slave_cnt == 0) {
1514                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1515                                    bond_dev->name);
1516                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1517                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1518                         pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n",
1519                                bond_dev->name);
1520                         res = -EOPNOTSUPP;
1521                         goto err_undo_flags;
1522                 }
1523         }
1524
1525         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1526         if (!new_slave) {
1527                 res = -ENOMEM;
1528                 goto err_undo_flags;
1529         }
1530
1531         /* save slave's original flags before calling
1532          * netdev_set_master and dev_open
1533          */
1534         new_slave->original_flags = slave_dev->flags;
1535
1536         /*
1537          * Save slave's original ("permanent") mac address for modes
1538          * that need it, and for restoring it upon release, and then
1539          * set it to the master's address
1540          */
1541         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1542
1543         if (!bond->params.fail_over_mac) {
1544                 /*
1545                  * Set slave to master's mac address.  The application already
1546                  * set the master's mac address to that of the first slave
1547                  */
1548                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1549                 addr.sa_family = slave_dev->type;
1550                 res = dev_set_mac_address(slave_dev, &addr);
1551                 if (res) {
1552                         pr_debug("Error %d calling set_mac_address\n", res);
1553                         goto err_free;
1554                 }
1555         }
1556
1557         res = netdev_set_master(slave_dev, bond_dev);
1558         if (res) {
1559                 pr_debug("Error %d calling netdev_set_master\n", res);
1560                 goto err_restore_mac;
1561         }
1562         /* open the slave since the application closed it */
1563         res = dev_open(slave_dev);
1564         if (res) {
1565                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1566                 goto err_unset_master;
1567         }
1568
1569         new_slave->dev = slave_dev;
1570         slave_dev->priv_flags |= IFF_BONDING;
1571
1572         if (bond_is_lb(bond)) {
1573                 /* bond_alb_init_slave() must be called before all other stages since
1574                  * it might fail and we do not want to have to undo everything
1575                  */
1576                 res = bond_alb_init_slave(bond, new_slave);
1577                 if (res)
1578                         goto err_close;
1579         }
1580
1581         /* If the mode USES_PRIMARY, then the new slave gets the
1582          * master's promisc (and mc) settings only if it becomes the
1583          * curr_active_slave, and that is taken care of later when calling
1584          * bond_change_active()
1585          */
1586         if (!USES_PRIMARY(bond->params.mode)) {
1587                 /* set promiscuity level to new slave */
1588                 if (bond_dev->flags & IFF_PROMISC) {
1589                         res = dev_set_promiscuity(slave_dev, 1);
1590                         if (res)
1591                                 goto err_close;
1592                 }
1593
1594                 /* set allmulti level to new slave */
1595                 if (bond_dev->flags & IFF_ALLMULTI) {
1596                         res = dev_set_allmulti(slave_dev, 1);
1597                         if (res)
1598                                 goto err_close;
1599                 }
1600
1601                 netif_addr_lock_bh(bond_dev);
1602                 /* upload master's mc_list to new slave */
1603                 netdev_for_each_mc_addr(ha, bond_dev)
1604                         dev_mc_add(slave_dev, ha->addr);
1605                 netif_addr_unlock_bh(bond_dev);
1606         }
1607
1608         if (bond->params.mode == BOND_MODE_8023AD) {
1609                 /* add lacpdu mc addr to mc list */
1610                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1611
1612                 dev_mc_add(slave_dev, lacpdu_multicast);
1613         }
1614
1615         bond_add_vlans_on_slave(bond, slave_dev);
1616
1617         write_lock_bh(&bond->lock);
1618
1619         bond_attach_slave(bond, new_slave);
1620
1621         new_slave->delay = 0;
1622         new_slave->link_failure_count = 0;
1623
1624         bond_compute_features(bond);
1625
1626         write_unlock_bh(&bond->lock);
1627
1628         read_lock(&bond->lock);
1629
1630         new_slave->last_arp_rx = jiffies;
1631
1632         if (bond->params.miimon && !bond->params.use_carrier) {
1633                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1634
1635                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1636                         /*
1637                          * miimon is set but a bonded network driver
1638                          * does not support ETHTOOL/MII and
1639                          * arp_interval is not set.  Note: if
1640                          * use_carrier is enabled, we will never go
1641                          * here (because netif_carrier is always
1642                          * supported); thus, we don't need to change
1643                          * the messages for netif_carrier.
1644                          */
1645                         pr_warning("%s: Warning: MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details.\n",
1646                                bond_dev->name, slave_dev->name);
1647                 } else if (link_reporting == -1) {
1648                         /* unable get link status using mii/ethtool */
1649                         pr_warning("%s: Warning: can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface.\n",
1650                                    bond_dev->name, slave_dev->name);
1651                 }
1652         }
1653
1654         /* check for initial state */
1655         if (!bond->params.miimon ||
1656             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1657                 if (bond->params.updelay) {
1658                         pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1659                         new_slave->link  = BOND_LINK_BACK;
1660                         new_slave->delay = bond->params.updelay;
1661                 } else {
1662                         pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1663                         new_slave->link  = BOND_LINK_UP;
1664                 }
1665                 new_slave->jiffies = jiffies;
1666         } else {
1667                 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1668                 new_slave->link  = BOND_LINK_DOWN;
1669         }
1670
1671         if (bond_update_speed_duplex(new_slave) &&
1672             (new_slave->link != BOND_LINK_DOWN)) {
1673                 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n",
1674                            bond_dev->name, new_slave->dev->name);
1675
1676                 if (bond->params.mode == BOND_MODE_8023AD) {
1677                         pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n",
1678                                    bond_dev->name);
1679                 }
1680         }
1681
1682         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1683                 /* if there is a primary slave, remember it */
1684                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1685                         bond->primary_slave = new_slave;
1686                         bond->force_primary = true;
1687                 }
1688         }
1689
1690         write_lock_bh(&bond->curr_slave_lock);
1691
1692         switch (bond->params.mode) {
1693         case BOND_MODE_ACTIVEBACKUP:
1694                 bond_set_slave_inactive_flags(new_slave);
1695                 bond_select_active_slave(bond);
1696                 break;
1697         case BOND_MODE_8023AD:
1698                 /* in 802.3ad mode, the internal mechanism
1699                  * will activate the slaves in the selected
1700                  * aggregator
1701                  */
1702                 bond_set_slave_inactive_flags(new_slave);
1703                 /* if this is the first slave */
1704                 if (bond->slave_cnt == 1) {
1705                         SLAVE_AD_INFO(new_slave).id = 1;
1706                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1707                          * can be called only after the mac address of the bond is set
1708                          */
1709                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1710                                             bond->params.lacp_fast);
1711                 } else {
1712                         SLAVE_AD_INFO(new_slave).id =
1713                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1714                 }
1715
1716                 bond_3ad_bind_slave(new_slave);
1717                 break;
1718         case BOND_MODE_TLB:
1719         case BOND_MODE_ALB:
1720                 new_slave->state = BOND_STATE_ACTIVE;
1721                 bond_set_slave_inactive_flags(new_slave);
1722                 bond_select_active_slave(bond);
1723                 break;
1724         default:
1725                 pr_debug("This slave is always active in trunk mode\n");
1726
1727                 /* always active in trunk mode */
1728                 new_slave->state = BOND_STATE_ACTIVE;
1729
1730                 /* In trunking mode there is little meaning to curr_active_slave
1731                  * anyway (it holds no special properties of the bond device),
1732                  * so we can change it without calling change_active_interface()
1733                  */
1734                 if (!bond->curr_active_slave)
1735                         bond->curr_active_slave = new_slave;
1736
1737                 break;
1738         } /* switch(bond_mode) */
1739
1740         write_unlock_bh(&bond->curr_slave_lock);
1741
1742         bond_set_carrier(bond);
1743
1744 #ifdef CONFIG_NET_POLL_CONTROLLER
1745         /*
1746          * Netpoll and bonding is broken, make sure it is not initialized
1747          * until it is fixed.
1748          */
1749         if (disable_netpoll) {
1750                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1751         } else {
1752                 if (slaves_support_netpoll(bond_dev)) {
1753                         bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
1754                         if (bond_dev->npinfo)
1755                                 slave_dev->npinfo = bond_dev->npinfo;
1756                 } else if (!(bond_dev->priv_flags & IFF_DISABLE_NETPOLL)) {
1757                         bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1758                         pr_info("New slave device %s does not support netpoll\n",
1759                                 slave_dev->name);
1760                         pr_info("Disabling netpoll support for %s\n", bond_dev->name);
1761                 }
1762         }
1763 #endif
1764         read_unlock(&bond->lock);
1765
1766         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1767         if (res)
1768                 goto err_close;
1769
1770         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1771                 bond_dev->name, slave_dev->name,
1772                 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1773                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1774
1775         /* enslave is successful */
1776         return 0;
1777
1778 /* Undo stages on error */
1779 err_close:
1780         dev_close(slave_dev);
1781
1782 err_unset_master:
1783         netdev_set_master(slave_dev, NULL);
1784
1785 err_restore_mac:
1786         if (!bond->params.fail_over_mac) {
1787                 /* XXX TODO - fom follow mode needs to change master's
1788                  * MAC if this slave's MAC is in use by the bond, or at
1789                  * least print a warning.
1790                  */
1791                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1792                 addr.sa_family = slave_dev->type;
1793                 dev_set_mac_address(slave_dev, &addr);
1794         }
1795
1796 err_free:
1797         kfree(new_slave);
1798
1799 err_undo_flags:
1800         bond_dev->features = old_features;
1801
1802         return res;
1803 }
1804
1805 /*
1806  * Try to release the slave device <slave> from the bond device <master>
1807  * It is legal to access curr_active_slave without a lock because all the function
1808  * is write-locked.
1809  *
1810  * The rules for slave state should be:
1811  *   for Active/Backup:
1812  *     Active stays on all backups go down
1813  *   for Bonded connections:
1814  *     The first up interface should be left on and all others downed.
1815  */
1816 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1817 {
1818         struct bonding *bond = netdev_priv(bond_dev);
1819         struct slave *slave, *oldcurrent;
1820         struct sockaddr addr;
1821
1822         /* slave is not a slave or master is not master of this slave */
1823         if (!(slave_dev->flags & IFF_SLAVE) ||
1824             (slave_dev->master != bond_dev)) {
1825                 pr_err("%s: Error: cannot release %s.\n",
1826                        bond_dev->name, slave_dev->name);
1827                 return -EINVAL;
1828         }
1829
1830         netdev_bonding_change(bond_dev, NETDEV_BONDING_DESLAVE);
1831         write_lock_bh(&bond->lock);
1832
1833         slave = bond_get_slave_by_dev(bond, slave_dev);
1834         if (!slave) {
1835                 /* not a slave of this bond */
1836                 pr_info("%s: %s not enslaved\n",
1837                         bond_dev->name, slave_dev->name);
1838                 write_unlock_bh(&bond->lock);
1839                 return -EINVAL;
1840         }
1841
1842         if (!bond->params.fail_over_mac) {
1843                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1844                     bond->slave_cnt > 1)
1845                         pr_warning("%s: Warning: the permanent HWaddr of %s - %pM - is still in use by %s. Set the HWaddr of %s to a different address to avoid conflicts.\n",
1846                                    bond_dev->name, slave_dev->name,
1847                                    slave->perm_hwaddr,
1848                                    bond_dev->name, slave_dev->name);
1849         }
1850
1851         /* Inform AD package of unbinding of slave. */
1852         if (bond->params.mode == BOND_MODE_8023AD) {
1853                 /* must be called before the slave is
1854                  * detached from the list
1855                  */
1856                 bond_3ad_unbind_slave(slave);
1857         }
1858
1859         pr_info("%s: releasing %s interface %s\n",
1860                 bond_dev->name,
1861                 (slave->state == BOND_STATE_ACTIVE) ? "active" : "backup",
1862                 slave_dev->name);
1863
1864         oldcurrent = bond->curr_active_slave;
1865
1866         bond->current_arp_slave = NULL;
1867
1868         /* release the slave from its bond */
1869         bond_detach_slave(bond, slave);
1870
1871         bond_compute_features(bond);
1872
1873         if (bond->primary_slave == slave)
1874                 bond->primary_slave = NULL;
1875
1876         if (oldcurrent == slave)
1877                 bond_change_active_slave(bond, NULL);
1878
1879         if (bond_is_lb(bond)) {
1880                 /* Must be called only after the slave has been
1881                  * detached from the list and the curr_active_slave
1882                  * has been cleared (if our_slave == old_current),
1883                  * but before a new active slave is selected.
1884                  */
1885                 write_unlock_bh(&bond->lock);
1886                 bond_alb_deinit_slave(bond, slave);
1887                 write_lock_bh(&bond->lock);
1888         }
1889
1890         if (oldcurrent == slave) {
1891                 /*
1892                  * Note that we hold RTNL over this sequence, so there
1893                  * is no concern that another slave add/remove event
1894                  * will interfere.
1895                  */
1896                 write_unlock_bh(&bond->lock);
1897                 read_lock(&bond->lock);
1898                 write_lock_bh(&bond->curr_slave_lock);
1899
1900                 bond_select_active_slave(bond);
1901
1902                 write_unlock_bh(&bond->curr_slave_lock);
1903                 read_unlock(&bond->lock);
1904                 write_lock_bh(&bond->lock);
1905         }
1906
1907         if (bond->slave_cnt == 0) {
1908                 bond_set_carrier(bond);
1909
1910                 /* if the last slave was removed, zero the mac address
1911                  * of the master so it will be set by the application
1912                  * to the mac address of the first slave
1913                  */
1914                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1915
1916                 if (list_empty(&bond->vlan_list)) {
1917                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1918                 } else {
1919                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1920                                    bond_dev->name, bond_dev->name);
1921                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1922                                    bond_dev->name);
1923                 }
1924         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1925                    !bond_has_challenged_slaves(bond)) {
1926                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1927                         bond_dev->name, slave_dev->name, bond_dev->name);
1928                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1929         }
1930
1931         write_unlock_bh(&bond->lock);
1932
1933         /* must do this from outside any spinlocks */
1934         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1935
1936         bond_del_vlans_from_slave(bond, slave_dev);
1937
1938         /* If the mode USES_PRIMARY, then we should only remove its
1939          * promisc and mc settings if it was the curr_active_slave, but that was
1940          * already taken care of above when we detached the slave
1941          */
1942         if (!USES_PRIMARY(bond->params.mode)) {
1943                 /* unset promiscuity level from slave */
1944                 if (bond_dev->flags & IFF_PROMISC)
1945                         dev_set_promiscuity(slave_dev, -1);
1946
1947                 /* unset allmulti level from slave */
1948                 if (bond_dev->flags & IFF_ALLMULTI)
1949                         dev_set_allmulti(slave_dev, -1);
1950
1951                 /* flush master's mc_list from slave */
1952                 netif_addr_lock_bh(bond_dev);
1953                 bond_mc_list_flush(bond_dev, slave_dev);
1954                 netif_addr_unlock_bh(bond_dev);
1955         }
1956
1957         netdev_set_master(slave_dev, NULL);
1958
1959 #ifdef CONFIG_NET_POLL_CONTROLLER
1960         read_lock_bh(&bond->lock);
1961
1962          /* Make sure netpoll over stays disabled until fixed. */
1963         if (!disable_netpoll)
1964                 if (slaves_support_netpoll(bond_dev))
1965                                 bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
1966         read_unlock_bh(&bond->lock);
1967         if (slave_dev->netdev_ops->ndo_netpoll_cleanup)
1968                 slave_dev->netdev_ops->ndo_netpoll_cleanup(slave_dev);
1969         else
1970                 slave_dev->npinfo = NULL;
1971 #endif
1972
1973         /* close slave before restoring its mac address */
1974         dev_close(slave_dev);
1975
1976         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1977                 /* restore original ("permanent") mac address */
1978                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1979                 addr.sa_family = slave_dev->type;
1980                 dev_set_mac_address(slave_dev, &addr);
1981         }
1982
1983         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1984                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1985                                    IFF_SLAVE_NEEDARP);
1986
1987         kfree(slave);
1988
1989         return 0;  /* deletion OK */
1990 }
1991
1992 /*
1993 * First release a slave and than destroy the bond if no more slaves are left.
1994 * Must be under rtnl_lock when this function is called.
1995 */
1996 int  bond_release_and_destroy(struct net_device *bond_dev,
1997                               struct net_device *slave_dev)
1998 {
1999         struct bonding *bond = netdev_priv(bond_dev);
2000         int ret;
2001
2002         ret = bond_release(bond_dev, slave_dev);
2003         if ((ret == 0) && (bond->slave_cnt == 0)) {
2004                 pr_info("%s: destroying bond %s.\n",
2005                         bond_dev->name, bond_dev->name);
2006                 unregister_netdevice(bond_dev);
2007         }
2008         return ret;
2009 }
2010
2011 /*
2012  * This function releases all slaves.
2013  */
2014 static int bond_release_all(struct net_device *bond_dev)
2015 {
2016         struct bonding *bond = netdev_priv(bond_dev);
2017         struct slave *slave;
2018         struct net_device *slave_dev;
2019         struct sockaddr addr;
2020
2021         write_lock_bh(&bond->lock);
2022
2023         netif_carrier_off(bond_dev);
2024
2025         if (bond->slave_cnt == 0)
2026                 goto out;
2027
2028         bond->current_arp_slave = NULL;
2029         bond->primary_slave = NULL;
2030         bond_change_active_slave(bond, NULL);
2031
2032         while ((slave = bond->first_slave) != NULL) {
2033                 /* Inform AD package of unbinding of slave
2034                  * before slave is detached from the list.
2035                  */
2036                 if (bond->params.mode == BOND_MODE_8023AD)
2037                         bond_3ad_unbind_slave(slave);
2038
2039                 slave_dev = slave->dev;
2040                 bond_detach_slave(bond, slave);
2041
2042                 /* now that the slave is detached, unlock and perform
2043                  * all the undo steps that should not be called from
2044                  * within a lock.
2045                  */
2046                 write_unlock_bh(&bond->lock);
2047
2048                 if (bond_is_lb(bond)) {
2049                         /* must be called only after the slave
2050                          * has been detached from the list
2051                          */
2052                         bond_alb_deinit_slave(bond, slave);
2053                 }
2054
2055                 bond_compute_features(bond);
2056
2057                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2058                 bond_del_vlans_from_slave(bond, slave_dev);
2059
2060                 /* If the mode USES_PRIMARY, then we should only remove its
2061                  * promisc and mc settings if it was the curr_active_slave, but that was
2062                  * already taken care of above when we detached the slave
2063                  */
2064                 if (!USES_PRIMARY(bond->params.mode)) {
2065                         /* unset promiscuity level from slave */
2066                         if (bond_dev->flags & IFF_PROMISC)
2067                                 dev_set_promiscuity(slave_dev, -1);
2068
2069                         /* unset allmulti level from slave */
2070                         if (bond_dev->flags & IFF_ALLMULTI)
2071                                 dev_set_allmulti(slave_dev, -1);
2072
2073                         /* flush master's mc_list from slave */
2074                         netif_addr_lock_bh(bond_dev);
2075                         bond_mc_list_flush(bond_dev, slave_dev);
2076                         netif_addr_unlock_bh(bond_dev);
2077                 }
2078
2079                 netdev_set_master(slave_dev, NULL);
2080
2081                 /* close slave before restoring its mac address */
2082                 dev_close(slave_dev);
2083
2084                 if (!bond->params.fail_over_mac) {
2085                         /* restore original ("permanent") mac address*/
2086                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2087                         addr.sa_family = slave_dev->type;
2088                         dev_set_mac_address(slave_dev, &addr);
2089                 }
2090
2091                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2092                                            IFF_SLAVE_INACTIVE);
2093
2094                 kfree(slave);
2095
2096                 /* re-acquire the lock before getting the next slave */
2097                 write_lock_bh(&bond->lock);
2098         }
2099
2100         /* zero the mac address of the master so it will be
2101          * set by the application to the mac address of the
2102          * first slave
2103          */
2104         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2105
2106         if (list_empty(&bond->vlan_list))
2107                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2108         else {
2109                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2110                            bond_dev->name, bond_dev->name);
2111                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2112                            bond_dev->name);
2113         }
2114
2115         pr_info("%s: released all slaves\n", bond_dev->name);
2116
2117 out:
2118         write_unlock_bh(&bond->lock);
2119
2120         return 0;
2121 }
2122
2123 /*
2124  * This function changes the active slave to slave <slave_dev>.
2125  * It returns -EINVAL in the following cases.
2126  *  - <slave_dev> is not found in the list.
2127  *  - There is not active slave now.
2128  *  - <slave_dev> is already active.
2129  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2130  *  - <slave_dev> is not running.
2131  * In these cases, this function does nothing.
2132  * In the other cases, current_slave pointer is changed and 0 is returned.
2133  */
2134 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2135 {
2136         struct bonding *bond = netdev_priv(bond_dev);
2137         struct slave *old_active = NULL;
2138         struct slave *new_active = NULL;
2139         int res = 0;
2140
2141         if (!USES_PRIMARY(bond->params.mode))
2142                 return -EINVAL;
2143
2144         /* Verify that master_dev is indeed the master of slave_dev */
2145         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2146                 return -EINVAL;
2147
2148         read_lock(&bond->lock);
2149
2150         read_lock(&bond->curr_slave_lock);
2151         old_active = bond->curr_active_slave;
2152         read_unlock(&bond->curr_slave_lock);
2153
2154         new_active = bond_get_slave_by_dev(bond, slave_dev);
2155
2156         /*
2157          * Changing to the current active: do nothing; return success.
2158          */
2159         if (new_active && (new_active == old_active)) {
2160                 read_unlock(&bond->lock);
2161                 return 0;
2162         }
2163
2164         if ((new_active) &&
2165             (old_active) &&
2166             (new_active->link == BOND_LINK_UP) &&
2167             IS_UP(new_active->dev)) {
2168                 write_lock_bh(&bond->curr_slave_lock);
2169                 bond_change_active_slave(bond, new_active);
2170                 write_unlock_bh(&bond->curr_slave_lock);
2171         } else
2172                 res = -EINVAL;
2173
2174         read_unlock(&bond->lock);
2175
2176         return res;
2177 }
2178
2179 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2180 {
2181         struct bonding *bond = netdev_priv(bond_dev);
2182
2183         info->bond_mode = bond->params.mode;
2184         info->miimon = bond->params.miimon;
2185
2186         read_lock(&bond->lock);
2187         info->num_slaves = bond->slave_cnt;
2188         read_unlock(&bond->lock);
2189
2190         return 0;
2191 }
2192
2193 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2194 {
2195         struct bonding *bond = netdev_priv(bond_dev);
2196         struct slave *slave;
2197         int i, res = -ENODEV;
2198
2199         read_lock(&bond->lock);
2200
2201         bond_for_each_slave(bond, slave, i) {
2202                 if (i == (int)info->slave_id) {
2203                         res = 0;
2204                         strcpy(info->slave_name, slave->dev->name);
2205                         info->link = slave->link;
2206                         info->state = slave->state;
2207                         info->link_failure_count = slave->link_failure_count;
2208                         break;
2209                 }
2210         }
2211
2212         read_unlock(&bond->lock);
2213
2214         return res;
2215 }
2216
2217 /*-------------------------------- Monitoring -------------------------------*/
2218
2219
2220 static int bond_miimon_inspect(struct bonding *bond)
2221 {
2222         struct slave *slave;
2223         int i, link_state, commit = 0;
2224         bool ignore_updelay;
2225
2226         ignore_updelay = !bond->curr_active_slave ? true : false;
2227
2228         bond_for_each_slave(bond, slave, i) {
2229                 slave->new_link = BOND_LINK_NOCHANGE;
2230
2231                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2232
2233                 switch (slave->link) {
2234                 case BOND_LINK_UP:
2235                         if (link_state)
2236                                 continue;
2237
2238                         slave->link = BOND_LINK_FAIL;
2239                         slave->delay = bond->params.downdelay;
2240                         if (slave->delay) {
2241                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2242                                         bond->dev->name,
2243                                         (bond->params.mode ==
2244                                          BOND_MODE_ACTIVEBACKUP) ?
2245                                         ((slave->state == BOND_STATE_ACTIVE) ?
2246                                          "active " : "backup ") : "",
2247                                         slave->dev->name,
2248                                         bond->params.downdelay * bond->params.miimon);
2249                         }
2250                         /*FALLTHRU*/
2251                 case BOND_LINK_FAIL:
2252                         if (link_state) {
2253                                 /*
2254                                  * recovered before downdelay expired
2255                                  */
2256                                 slave->link = BOND_LINK_UP;
2257                                 slave->jiffies = jiffies;
2258                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2259                                         bond->dev->name,
2260                                         (bond->params.downdelay - slave->delay) *
2261                                         bond->params.miimon,
2262                                         slave->dev->name);
2263                                 continue;
2264                         }
2265
2266                         if (slave->delay <= 0) {
2267                                 slave->new_link = BOND_LINK_DOWN;
2268                                 commit++;
2269                                 continue;
2270                         }
2271
2272                         slave->delay--;
2273                         break;
2274
2275                 case BOND_LINK_DOWN:
2276                         if (!link_state)
2277                                 continue;
2278
2279                         slave->link = BOND_LINK_BACK;
2280                         slave->delay = bond->params.updelay;
2281
2282                         if (slave->delay) {
2283                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2284                                         bond->dev->name, slave->dev->name,
2285                                         ignore_updelay ? 0 :
2286                                         bond->params.updelay *
2287                                         bond->params.miimon);
2288                         }
2289                         /*FALLTHRU*/
2290                 case BOND_LINK_BACK:
2291                         if (!link_state) {
2292                                 slave->link = BOND_LINK_DOWN;
2293                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2294                                         bond->dev->name,
2295                                         (bond->params.updelay - slave->delay) *
2296                                         bond->params.miimon,
2297                                         slave->dev->name);
2298
2299                                 continue;
2300                         }
2301
2302                         if (ignore_updelay)
2303                                 slave->delay = 0;
2304
2305                         if (slave->delay <= 0) {
2306                                 slave->new_link = BOND_LINK_UP;
2307                                 commit++;
2308                                 ignore_updelay = false;
2309                                 continue;
2310                         }
2311
2312                         slave->delay--;
2313                         break;
2314                 }
2315         }
2316
2317         return commit;
2318 }
2319
2320 static void bond_miimon_commit(struct bonding *bond)
2321 {
2322         struct slave *slave;
2323         int i;
2324
2325         bond_for_each_slave(bond, slave, i) {
2326                 switch (slave->new_link) {
2327                 case BOND_LINK_NOCHANGE:
2328                         continue;
2329
2330                 case BOND_LINK_UP:
2331                         slave->link = BOND_LINK_UP;
2332                         slave->jiffies = jiffies;
2333
2334                         if (bond->params.mode == BOND_MODE_8023AD) {
2335                                 /* prevent it from being the active one */
2336                                 slave->state = BOND_STATE_BACKUP;
2337                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2338                                 /* make it immediately active */
2339                                 slave->state = BOND_STATE_ACTIVE;
2340                         } else if (slave != bond->primary_slave) {
2341                                 /* prevent it from being the active one */
2342                                 slave->state = BOND_STATE_BACKUP;
2343                         }
2344
2345                         pr_info("%s: link status definitely up for interface %s.\n",
2346                                 bond->dev->name, slave->dev->name);
2347
2348                         /* notify ad that the link status has changed */
2349                         if (bond->params.mode == BOND_MODE_8023AD)
2350                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2351
2352                         if (bond_is_lb(bond))
2353                                 bond_alb_handle_link_change(bond, slave,
2354                                                             BOND_LINK_UP);
2355
2356                         if (!bond->curr_active_slave ||
2357                             (slave == bond->primary_slave))
2358                                 goto do_failover;
2359
2360                         continue;
2361
2362                 case BOND_LINK_DOWN:
2363                         if (slave->link_failure_count < UINT_MAX)
2364                                 slave->link_failure_count++;
2365
2366                         slave->link = BOND_LINK_DOWN;
2367
2368                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2369                             bond->params.mode == BOND_MODE_8023AD)
2370                                 bond_set_slave_inactive_flags(slave);
2371
2372                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2373                                 bond->dev->name, slave->dev->name);
2374
2375                         if (bond->params.mode == BOND_MODE_8023AD)
2376                                 bond_3ad_handle_link_change(slave,
2377                                                             BOND_LINK_DOWN);
2378
2379                         if (bond_is_lb(bond))
2380                                 bond_alb_handle_link_change(bond, slave,
2381                                                             BOND_LINK_DOWN);
2382
2383                         if (slave == bond->curr_active_slave)
2384                                 goto do_failover;
2385
2386                         continue;
2387
2388                 default:
2389                         pr_err("%s: invalid new link %d on slave %s\n",
2390                                bond->dev->name, slave->new_link,
2391                                slave->dev->name);
2392                         slave->new_link = BOND_LINK_NOCHANGE;
2393
2394                         continue;
2395                 }
2396
2397 do_failover:
2398                 ASSERT_RTNL();
2399                 write_lock_bh(&bond->curr_slave_lock);
2400                 bond_select_active_slave(bond);
2401                 write_unlock_bh(&bond->curr_slave_lock);
2402         }
2403
2404         bond_set_carrier(bond);
2405 }
2406
2407 /*
2408  * bond_mii_monitor
2409  *
2410  * Really a wrapper that splits the mii monitor into two phases: an
2411  * inspection, then (if inspection indicates something needs to be done)
2412  * an acquisition of appropriate locks followed by a commit phase to
2413  * implement whatever link state changes are indicated.
2414  */
2415 void bond_mii_monitor(struct work_struct *work)
2416 {
2417         struct bonding *bond = container_of(work, struct bonding,
2418                                             mii_work.work);
2419
2420         read_lock(&bond->lock);
2421         if (bond->kill_timers)
2422                 goto out;
2423
2424         if (bond->slave_cnt == 0)
2425                 goto re_arm;
2426
2427         if (bond->send_grat_arp) {
2428                 read_lock(&bond->curr_slave_lock);
2429                 bond_send_gratuitous_arp(bond);
2430                 read_unlock(&bond->curr_slave_lock);
2431         }
2432
2433         if (bond->send_unsol_na) {
2434                 read_lock(&bond->curr_slave_lock);
2435                 bond_send_unsolicited_na(bond);
2436                 read_unlock(&bond->curr_slave_lock);
2437         }
2438
2439         if (bond_miimon_inspect(bond)) {
2440                 read_unlock(&bond->lock);
2441                 rtnl_lock();
2442                 read_lock(&bond->lock);
2443
2444                 bond_miimon_commit(bond);
2445
2446                 read_unlock(&bond->lock);
2447                 rtnl_unlock();  /* might sleep, hold no other locks */
2448                 read_lock(&bond->lock);
2449         }
2450
2451 re_arm:
2452         if (bond->params.miimon)
2453                 queue_delayed_work(bond->wq, &bond->mii_work,
2454                                    msecs_to_jiffies(bond->params.miimon));
2455 out:
2456         read_unlock(&bond->lock);
2457 }
2458
2459 static __be32 bond_glean_dev_ip(struct net_device *dev)
2460 {
2461         struct in_device *idev;
2462         struct in_ifaddr *ifa;
2463         __be32 addr = 0;
2464
2465         if (!dev)
2466                 return 0;
2467
2468         rcu_read_lock();
2469         idev = __in_dev_get_rcu(dev);
2470         if (!idev)
2471                 goto out;
2472
2473         ifa = idev->ifa_list;
2474         if (!ifa)
2475                 goto out;
2476
2477         addr = ifa->ifa_local;
2478 out:
2479         rcu_read_unlock();
2480         return addr;
2481 }
2482
2483 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2484 {
2485         struct vlan_entry *vlan;
2486
2487         if (ip == bond->master_ip)
2488                 return 1;
2489
2490         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2491                 if (ip == vlan->vlan_ip)
2492                         return 1;
2493         }
2494
2495         return 0;
2496 }
2497
2498 /*
2499  * We go to the (large) trouble of VLAN tagging ARP frames because
2500  * switches in VLAN mode (especially if ports are configured as
2501  * "native" to a VLAN) might not pass non-tagged frames.
2502  */
2503 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2504 {
2505         struct sk_buff *skb;
2506
2507         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2508                  slave_dev->name, dest_ip, src_ip, vlan_id);
2509
2510         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2511                          NULL, slave_dev->dev_addr, NULL);
2512
2513         if (!skb) {
2514                 pr_err("ARP packet allocation failed\n");
2515                 return;
2516         }
2517         if (vlan_id) {
2518                 skb = vlan_put_tag(skb, vlan_id);
2519                 if (!skb) {
2520                         pr_err("failed to insert VLAN tag\n");
2521                         return;
2522                 }
2523         }
2524         arp_xmit(skb);
2525 }
2526
2527
2528 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2529 {
2530         int i, vlan_id, rv;
2531         __be32 *targets = bond->params.arp_targets;
2532         struct vlan_entry *vlan;
2533         struct net_device *vlan_dev;
2534         struct flowi fl;
2535         struct rtable *rt;
2536
2537         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2538                 if (!targets[i])
2539                         break;
2540                 pr_debug("basa: target %x\n", targets[i]);
2541                 if (list_empty(&bond->vlan_list)) {
2542                         pr_debug("basa: empty vlan: arp_send\n");
2543                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2544                                       bond->master_ip, 0);
2545                         continue;
2546                 }
2547
2548                 /*
2549                  * If VLANs are configured, we do a route lookup to
2550                  * determine which VLAN interface would be used, so we
2551                  * can tag the ARP with the proper VLAN tag.
2552                  */
2553                 memset(&fl, 0, sizeof(fl));
2554                 fl.fl4_dst = targets[i];
2555                 fl.fl4_tos = RTO_ONLINK;
2556
2557                 rv = ip_route_output_key(dev_net(bond->dev), &rt, &fl);
2558                 if (rv) {
2559                         if (net_ratelimit()) {
2560                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2561                                            bond->dev->name, &fl.fl4_dst);
2562                         }
2563                         continue;
2564                 }
2565
2566                 /*
2567                  * This target is not on a VLAN
2568                  */
2569                 if (rt->u.dst.dev == bond->dev) {
2570                         ip_rt_put(rt);
2571                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2572                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2573                                       bond->master_ip, 0);
2574                         continue;
2575                 }
2576
2577                 vlan_id = 0;
2578                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2579                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2580                         if (vlan_dev == rt->u.dst.dev) {
2581                                 vlan_id = vlan->vlan_id;
2582                                 pr_debug("basa: vlan match on %s %d\n",
2583                                        vlan_dev->name, vlan_id);
2584                                 break;
2585                         }
2586                 }
2587
2588                 if (vlan_id) {
2589                         ip_rt_put(rt);
2590                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2591                                       vlan->vlan_ip, vlan_id);
2592                         continue;
2593                 }
2594
2595                 if (net_ratelimit()) {
2596                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2597                                    bond->dev->name, &fl.fl4_dst,
2598                                    rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2599                 }
2600                 ip_rt_put(rt);
2601         }
2602 }
2603
2604 /*
2605  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2606  * for each VLAN above us.
2607  *
2608  * Caller must hold curr_slave_lock for read or better
2609  */
2610 static void bond_send_gratuitous_arp(struct bonding *bond)
2611 {
2612         struct slave *slave = bond->curr_active_slave;
2613         struct vlan_entry *vlan;
2614         struct net_device *vlan_dev;
2615
2616         pr_debug("bond_send_grat_arp: bond %s slave %s\n",
2617                  bond->dev->name, slave ? slave->dev->name : "NULL");
2618
2619         if (!slave || !bond->send_grat_arp ||
2620             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2621                 return;
2622
2623         bond->send_grat_arp--;
2624
2625         if (bond->master_ip) {
2626                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2627                                 bond->master_ip, 0);
2628         }
2629
2630         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2631                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2632                 if (vlan->vlan_ip) {
2633                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2634                                       vlan->vlan_ip, vlan->vlan_id);
2635                 }
2636         }
2637 }
2638
2639 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2640 {
2641         int i;
2642         __be32 *targets = bond->params.arp_targets;
2643
2644         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2645                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2646                          &sip, &tip, i, &targets[i],
2647                          bond_has_this_ip(bond, tip));
2648                 if (sip == targets[i]) {
2649                         if (bond_has_this_ip(bond, tip))
2650                                 slave->last_arp_rx = jiffies;
2651                         return;
2652                 }
2653         }
2654 }
2655
2656 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2657 {
2658         struct arphdr *arp;
2659         struct slave *slave;
2660         struct bonding *bond;
2661         unsigned char *arp_ptr;
2662         __be32 sip, tip;
2663
2664         if (dev->priv_flags & IFF_802_1Q_VLAN) {
2665                 /*
2666                  * When using VLANS and bonding, dev and oriv_dev may be
2667                  * incorrect if the physical interface supports VLAN
2668                  * acceleration.  With this change ARP validation now
2669                  * works for hosts only reachable on the VLAN interface.
2670                  */
2671                 dev = vlan_dev_real_dev(dev);
2672                 orig_dev = dev_get_by_index_rcu(dev_net(skb->dev),skb->skb_iif);
2673         }
2674
2675         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2676                 goto out;
2677
2678         bond = netdev_priv(dev);
2679         read_lock(&bond->lock);
2680
2681         pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2682                  bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2683                  orig_dev ? orig_dev->name : "NULL");
2684
2685         slave = bond_get_slave_by_dev(bond, orig_dev);
2686         if (!slave || !slave_do_arp_validate(bond, slave))
2687                 goto out_unlock;
2688
2689         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2690                 goto out_unlock;
2691
2692         arp = arp_hdr(skb);
2693         if (arp->ar_hln != dev->addr_len ||
2694             skb->pkt_type == PACKET_OTHERHOST ||
2695             skb->pkt_type == PACKET_LOOPBACK ||
2696             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2697             arp->ar_pro != htons(ETH_P_IP) ||
2698             arp->ar_pln != 4)
2699                 goto out_unlock;
2700
2701         arp_ptr = (unsigned char *)(arp + 1);
2702         arp_ptr += dev->addr_len;
2703         memcpy(&sip, arp_ptr, 4);
2704         arp_ptr += 4 + dev->addr_len;
2705         memcpy(&tip, arp_ptr, 4);
2706
2707         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2708                  bond->dev->name, slave->dev->name, slave->state,
2709                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2710                  &sip, &tip);
2711
2712         /*
2713          * Backup slaves won't see the ARP reply, but do come through
2714          * here for each ARP probe (so we swap the sip/tip to validate
2715          * the probe).  In a "redundant switch, common router" type of
2716          * configuration, the ARP probe will (hopefully) travel from
2717          * the active, through one switch, the router, then the other
2718          * switch before reaching the backup.
2719          */
2720         if (slave->state == BOND_STATE_ACTIVE)
2721                 bond_validate_arp(bond, slave, sip, tip);
2722         else
2723                 bond_validate_arp(bond, slave, tip, sip);
2724
2725 out_unlock:
2726         read_unlock(&bond->lock);
2727 out:
2728         dev_kfree_skb(skb);
2729         return NET_RX_SUCCESS;
2730 }
2731
2732 /*
2733  * this function is called regularly to monitor each slave's link
2734  * ensuring that traffic is being sent and received when arp monitoring
2735  * is used in load-balancing mode. if the adapter has been dormant, then an
2736  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2737  * arp monitoring in active backup mode.
2738  */
2739 void bond_loadbalance_arp_mon(struct work_struct *work)
2740 {
2741         struct bonding *bond = container_of(work, struct bonding,
2742                                             arp_work.work);
2743         struct slave *slave, *oldcurrent;
2744         int do_failover = 0;
2745         int delta_in_ticks;
2746         int i;
2747
2748         read_lock(&bond->lock);
2749
2750         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2751
2752         if (bond->kill_timers)
2753                 goto out;
2754
2755         if (bond->slave_cnt == 0)
2756                 goto re_arm;
2757
2758         read_lock(&bond->curr_slave_lock);
2759         oldcurrent = bond->curr_active_slave;
2760         read_unlock(&bond->curr_slave_lock);
2761
2762         /* see if any of the previous devices are up now (i.e. they have
2763          * xmt and rcv traffic). the curr_active_slave does not come into
2764          * the picture unless it is null. also, slave->jiffies is not needed
2765          * here because we send an arp on each slave and give a slave as
2766          * long as it needs to get the tx/rx within the delta.
2767          * TODO: what about up/down delay in arp mode? it wasn't here before
2768          *       so it can wait
2769          */
2770         bond_for_each_slave(bond, slave, i) {
2771                 if (slave->link != BOND_LINK_UP) {
2772                         if (time_before_eq(jiffies, dev_trans_start(slave->dev) + delta_in_ticks) &&
2773                             time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
2774
2775                                 slave->link  = BOND_LINK_UP;
2776                                 slave->state = BOND_STATE_ACTIVE;
2777
2778                                 /* primary_slave has no meaning in round-robin
2779                                  * mode. the window of a slave being up and
2780                                  * curr_active_slave being null after enslaving
2781                                  * is closed.
2782                                  */
2783                                 if (!oldcurrent) {
2784                                         pr_info("%s: link status definitely up for interface %s, ",
2785                                                 bond->dev->name,
2786                                                 slave->dev->name);
2787                                         do_failover = 1;
2788                                 } else {
2789                                         pr_info("%s: interface %s is now up\n",
2790                                                 bond->dev->name,
2791                                                 slave->dev->name);
2792                                 }
2793                         }
2794                 } else {
2795                         /* slave->link == BOND_LINK_UP */
2796
2797                         /* not all switches will respond to an arp request
2798                          * when the source ip is 0, so don't take the link down
2799                          * if we don't know our ip yet
2800                          */
2801                         if (time_after_eq(jiffies, dev_trans_start(slave->dev) + 2*delta_in_ticks) ||
2802                             (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks))) {
2803
2804                                 slave->link  = BOND_LINK_DOWN;
2805                                 slave->state = BOND_STATE_BACKUP;
2806
2807                                 if (slave->link_failure_count < UINT_MAX)
2808                                         slave->link_failure_count++;
2809
2810                                 pr_info("%s: interface %s is now down.\n",
2811                                         bond->dev->name,
2812                                         slave->dev->name);
2813
2814                                 if (slave == oldcurrent)
2815                                         do_failover = 1;
2816                         }
2817                 }
2818
2819                 /* note: if switch is in round-robin mode, all links
2820                  * must tx arp to ensure all links rx an arp - otherwise
2821                  * links may oscillate or not come up at all; if switch is
2822                  * in something like xor mode, there is nothing we can
2823                  * do - all replies will be rx'ed on same link causing slaves
2824                  * to be unstable during low/no traffic periods
2825                  */
2826                 if (IS_UP(slave->dev))
2827                         bond_arp_send_all(bond, slave);
2828         }
2829
2830         if (do_failover) {
2831                 write_lock_bh(&bond->curr_slave_lock);
2832
2833                 bond_select_active_slave(bond);
2834
2835                 write_unlock_bh(&bond->curr_slave_lock);
2836         }
2837
2838 re_arm:
2839         if (bond->params.arp_interval)
2840                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2841 out:
2842         read_unlock(&bond->lock);
2843 }
2844
2845 /*
2846  * Called to inspect slaves for active-backup mode ARP monitor link state
2847  * changes.  Sets new_link in slaves to specify what action should take
2848  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2849  * to link states must be committed.
2850  *
2851  * Called with bond->lock held for read.
2852  */
2853 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2854 {
2855         struct slave *slave;
2856         int i, commit = 0;
2857
2858         bond_for_each_slave(bond, slave, i) {
2859                 slave->new_link = BOND_LINK_NOCHANGE;
2860
2861                 if (slave->link != BOND_LINK_UP) {
2862                         if (time_before_eq(jiffies, slave_last_rx(bond, slave) +
2863                                            delta_in_ticks)) {
2864                                 slave->new_link = BOND_LINK_UP;
2865                                 commit++;
2866                         }
2867
2868                         continue;
2869                 }
2870
2871                 /*
2872                  * Give slaves 2*delta after being enslaved or made
2873                  * active.  This avoids bouncing, as the last receive
2874                  * times need a full ARP monitor cycle to be updated.
2875                  */
2876                 if (!time_after_eq(jiffies, slave->jiffies +
2877                                    2 * delta_in_ticks))
2878                         continue;
2879
2880                 /*
2881                  * Backup slave is down if:
2882                  * - No current_arp_slave AND
2883                  * - more than 3*delta since last receive AND
2884                  * - the bond has an IP address
2885                  *
2886                  * Note: a non-null current_arp_slave indicates
2887                  * the curr_active_slave went down and we are
2888                  * searching for a new one; under this condition
2889                  * we only take the curr_active_slave down - this
2890                  * gives each slave a chance to tx/rx traffic
2891                  * before being taken out
2892                  */
2893                 if (slave->state == BOND_STATE_BACKUP &&
2894                     !bond->current_arp_slave &&
2895                     time_after(jiffies, slave_last_rx(bond, slave) +
2896                                3 * delta_in_ticks)) {
2897                         slave->new_link = BOND_LINK_DOWN;
2898                         commit++;
2899                 }
2900
2901                 /*
2902                  * Active slave is down if:
2903                  * - more than 2*delta since transmitting OR
2904                  * - (more than 2*delta since receive AND
2905                  *    the bond has an IP address)
2906                  */
2907                 if ((slave->state == BOND_STATE_ACTIVE) &&
2908                     (time_after_eq(jiffies, dev_trans_start(slave->dev) +
2909                                     2 * delta_in_ticks) ||
2910                       (time_after_eq(jiffies, slave_last_rx(bond, slave)
2911                                      + 2 * delta_in_ticks)))) {
2912                         slave->new_link = BOND_LINK_DOWN;
2913                         commit++;
2914                 }
2915         }
2916
2917         return commit;
2918 }
2919
2920 /*
2921  * Called to commit link state changes noted by inspection step of
2922  * active-backup mode ARP monitor.
2923  *
2924  * Called with RTNL and bond->lock for read.
2925  */
2926 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2927 {
2928         struct slave *slave;
2929         int i;
2930
2931         bond_for_each_slave(bond, slave, i) {
2932                 switch (slave->new_link) {
2933                 case BOND_LINK_NOCHANGE:
2934                         continue;
2935
2936                 case BOND_LINK_UP:
2937                         if ((!bond->curr_active_slave &&
2938                              time_before_eq(jiffies,
2939                                             dev_trans_start(slave->dev) +
2940                                             delta_in_ticks)) ||
2941                             bond->curr_active_slave != slave) {
2942                                 slave->link = BOND_LINK_UP;
2943                                 bond->current_arp_slave = NULL;
2944
2945                                 pr_info("%s: link status definitely up for interface %s.\n",
2946                                         bond->dev->name, slave->dev->name);
2947
2948                                 if (!bond->curr_active_slave ||
2949                                     (slave == bond->primary_slave))
2950                                         goto do_failover;
2951
2952                         }
2953
2954                         continue;
2955
2956                 case BOND_LINK_DOWN:
2957                         if (slave->link_failure_count < UINT_MAX)
2958                                 slave->link_failure_count++;
2959
2960                         slave->link = BOND_LINK_DOWN;
2961                         bond_set_slave_inactive_flags(slave);
2962
2963                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2964                                 bond->dev->name, slave->dev->name);
2965
2966                         if (slave == bond->curr_active_slave) {
2967                                 bond->current_arp_slave = NULL;
2968                                 goto do_failover;
2969                         }
2970
2971                         continue;
2972
2973                 default:
2974                         pr_err("%s: impossible: new_link %d on slave %s\n",
2975                                bond->dev->name, slave->new_link,
2976                                slave->dev->name);
2977                         continue;
2978                 }
2979
2980 do_failover:
2981                 ASSERT_RTNL();
2982                 write_lock_bh(&bond->curr_slave_lock);
2983                 bond_select_active_slave(bond);
2984                 write_unlock_bh(&bond->curr_slave_lock);
2985         }
2986
2987         bond_set_carrier(bond);
2988 }
2989
2990 /*
2991  * Send ARP probes for active-backup mode ARP monitor.
2992  *
2993  * Called with bond->lock held for read.
2994  */
2995 static void bond_ab_arp_probe(struct bonding *bond)
2996 {
2997         struct slave *slave;
2998         int i;
2999
3000         read_lock(&bond->curr_slave_lock);
3001
3002         if (bond->current_arp_slave && bond->curr_active_slave)
3003                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3004                         bond->current_arp_slave->dev->name,
3005                         bond->curr_active_slave->dev->name);
3006
3007         if (bond->curr_active_slave) {
3008                 bond_arp_send_all(bond, bond->curr_active_slave);
3009                 read_unlock(&bond->curr_slave_lock);
3010                 return;
3011         }
3012
3013         read_unlock(&bond->curr_slave_lock);
3014
3015         /* if we don't have a curr_active_slave, search for the next available
3016          * backup slave from the current_arp_slave and make it the candidate
3017          * for becoming the curr_active_slave
3018          */
3019
3020         if (!bond->current_arp_slave) {
3021                 bond->current_arp_slave = bond->first_slave;
3022                 if (!bond->current_arp_slave)
3023                         return;
3024         }
3025
3026         bond_set_slave_inactive_flags(bond->current_arp_slave);
3027
3028         /* search for next candidate */
3029         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3030                 if (IS_UP(slave->dev)) {
3031                         slave->link = BOND_LINK_BACK;
3032                         bond_set_slave_active_flags(slave);
3033                         bond_arp_send_all(bond, slave);
3034                         slave->jiffies = jiffies;
3035                         bond->current_arp_slave = slave;
3036                         break;
3037                 }
3038
3039                 /* if the link state is up at this point, we
3040                  * mark it down - this can happen if we have
3041                  * simultaneous link failures and
3042                  * reselect_active_interface doesn't make this
3043                  * one the current slave so it is still marked
3044                  * up when it is actually down
3045                  */
3046                 if (slave->link == BOND_LINK_UP) {
3047                         slave->link = BOND_LINK_DOWN;
3048                         if (slave->link_failure_count < UINT_MAX)
3049                                 slave->link_failure_count++;
3050
3051                         bond_set_slave_inactive_flags(slave);
3052
3053                         pr_info("%s: backup interface %s is now down.\n",
3054                                 bond->dev->name, slave->dev->name);
3055                 }
3056         }
3057 }
3058
3059 void bond_activebackup_arp_mon(struct work_struct *work)
3060 {
3061         struct bonding *bond = container_of(work, struct bonding,
3062                                             arp_work.work);
3063         int delta_in_ticks;
3064
3065         read_lock(&bond->lock);
3066
3067         if (bond->kill_timers)
3068                 goto out;
3069
3070         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3071
3072         if (bond->slave_cnt == 0)
3073                 goto re_arm;
3074
3075         if (bond->send_grat_arp) {
3076                 read_lock(&bond->curr_slave_lock);
3077                 bond_send_gratuitous_arp(bond);
3078                 read_unlock(&bond->curr_slave_lock);
3079         }
3080
3081         if (bond->send_unsol_na) {
3082                 read_lock(&bond->curr_slave_lock);
3083                 bond_send_unsolicited_na(bond);
3084                 read_unlock(&bond->curr_slave_lock);
3085         }
3086
3087         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3088                 read_unlock(&bond->lock);
3089                 rtnl_lock();
3090                 read_lock(&bond->lock);
3091
3092                 bond_ab_arp_commit(bond, delta_in_ticks);
3093
3094                 read_unlock(&bond->lock);
3095                 rtnl_unlock();
3096                 read_lock(&bond->lock);
3097         }
3098
3099         bond_ab_arp_probe(bond);
3100
3101 re_arm:
3102         if (bond->params.arp_interval)
3103                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3104 out:
3105         read_unlock(&bond->lock);
3106 }
3107
3108 /*------------------------------ proc/seq_file-------------------------------*/
3109
3110 #ifdef CONFIG_PROC_FS
3111
3112 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3113         __acquires(&dev_base_lock)
3114         __acquires(&bond->lock)
3115 {
3116         struct bonding *bond = seq->private;
3117         loff_t off = 0;
3118         struct slave *slave;
3119         int i;
3120
3121         /* make sure the bond won't be taken away */
3122         read_lock(&dev_base_lock);
3123         read_lock(&bond->lock);
3124
3125         if (*pos == 0)
3126                 return SEQ_START_TOKEN;
3127
3128         bond_for_each_slave(bond, slave, i) {
3129                 if (++off == *pos)
3130                         return slave;
3131         }
3132
3133         return NULL;
3134 }
3135
3136 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3137 {
3138         struct bonding *bond = seq->private;
3139         struct slave *slave = v;
3140
3141         ++*pos;
3142         if (v == SEQ_START_TOKEN)
3143                 return bond->first_slave;
3144
3145         slave = slave->next;
3146
3147         return (slave == bond->first_slave) ? NULL : slave;
3148 }
3149
3150 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3151         __releases(&bond->lock)
3152         __releases(&dev_base_lock)
3153 {
3154         struct bonding *bond = seq->private;
3155
3156         read_unlock(&bond->lock);
3157         read_unlock(&dev_base_lock);
3158 }
3159
3160 static void bond_info_show_master(struct seq_file *seq)
3161 {
3162         struct bonding *bond = seq->private;
3163         struct slave *curr;
3164         int i;
3165
3166         read_lock(&bond->curr_slave_lock);
3167         curr = bond->curr_active_slave;
3168         read_unlock(&bond->curr_slave_lock);
3169
3170         seq_printf(seq, "Bonding Mode: %s",
3171                    bond_mode_name(bond->params.mode));
3172
3173         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3174             bond->params.fail_over_mac)
3175                 seq_printf(seq, " (fail_over_mac %s)",
3176                    fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3177
3178         seq_printf(seq, "\n");
3179
3180         if (bond->params.mode == BOND_MODE_XOR ||
3181                 bond->params.mode == BOND_MODE_8023AD) {
3182                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3183                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3184                         bond->params.xmit_policy);
3185         }
3186
3187         if (USES_PRIMARY(bond->params.mode)) {
3188                 seq_printf(seq, "Primary Slave: %s",
3189                            (bond->primary_slave) ?
3190                            bond->primary_slave->dev->name : "None");
3191                 if (bond->primary_slave)
3192                         seq_printf(seq, " (primary_reselect %s)",
3193                    pri_reselect_tbl[bond->params.primary_reselect].modename);
3194
3195                 seq_printf(seq, "\nCurrently Active Slave: %s\n",
3196                            (curr) ? curr->dev->name : "None");
3197         }
3198
3199         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3200                    "up" : "down");
3201         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3202         seq_printf(seq, "Up Delay (ms): %d\n",
3203                    bond->params.updelay * bond->params.miimon);
3204         seq_printf(seq, "Down Delay (ms): %d\n",
3205                    bond->params.downdelay * bond->params.miimon);
3206
3207
3208         /* ARP information */
3209         if (bond->params.arp_interval > 0) {
3210                 int printed = 0;
3211                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3212                                 bond->params.arp_interval);
3213
3214                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3215
3216                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
3217                         if (!bond->params.arp_targets[i])
3218                                 break;
3219                         if (printed)
3220                                 seq_printf(seq, ",");
3221                         seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3222                         printed = 1;
3223                 }
3224                 seq_printf(seq, "\n");
3225         }
3226
3227         if (bond->params.mode == BOND_MODE_8023AD) {
3228                 struct ad_info ad_info;
3229
3230                 seq_puts(seq, "\n802.3ad info\n");
3231                 seq_printf(seq, "LACP rate: %s\n",
3232                            (bond->params.lacp_fast) ? "fast" : "slow");
3233                 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3234                            ad_select_tbl[bond->params.ad_select].modename);
3235
3236                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3237                         seq_printf(seq, "bond %s has no active aggregator\n",
3238                                    bond->dev->name);
3239                 } else {
3240                         seq_printf(seq, "Active Aggregator Info:\n");
3241
3242                         seq_printf(seq, "\tAggregator ID: %d\n",
3243                                    ad_info.aggregator_id);
3244                         seq_printf(seq, "\tNumber of ports: %d\n",
3245                                    ad_info.ports);
3246                         seq_printf(seq, "\tActor Key: %d\n",
3247                                    ad_info.actor_key);
3248                         seq_printf(seq, "\tPartner Key: %d\n",
3249                                    ad_info.partner_key);
3250                         seq_printf(seq, "\tPartner Mac Address: %pM\n",
3251                                    ad_info.partner_system);
3252                 }
3253         }
3254 }
3255
3256 static void bond_info_show_slave(struct seq_file *seq,
3257                                  const struct slave *slave)
3258 {
3259         struct bonding *bond = seq->private;
3260
3261         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3262         seq_printf(seq, "MII Status: %s\n",
3263                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3264         seq_printf(seq, "Link Failure Count: %u\n",
3265                    slave->link_failure_count);
3266
3267         seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3268
3269         if (bond->params.mode == BOND_MODE_8023AD) {
3270                 const struct aggregator *agg
3271                         = SLAVE_AD_INFO(slave).port.aggregator;
3272
3273                 if (agg)
3274                         seq_printf(seq, "Aggregator ID: %d\n",
3275                                    agg->aggregator_identifier);
3276                 else
3277                         seq_puts(seq, "Aggregator ID: N/A\n");
3278         }
3279 }
3280
3281 static int bond_info_seq_show(struct seq_file *seq, void *v)
3282 {
3283         if (v == SEQ_START_TOKEN) {
3284                 seq_printf(seq, "%s\n", version);
3285                 bond_info_show_master(seq);
3286         } else
3287                 bond_info_show_slave(seq, v);
3288
3289         return 0;
3290 }
3291
3292 static const struct seq_operations bond_info_seq_ops = {
3293         .start = bond_info_seq_start,
3294         .next  = bond_info_seq_next,
3295         .stop  = bond_info_seq_stop,
3296         .show  = bond_info_seq_show,
3297 };
3298
3299 static int bond_info_open(struct inode *inode, struct file *file)
3300 {
3301         struct seq_file *seq;
3302         struct proc_dir_entry *proc;
3303         int res;
3304
3305         res = seq_open(file, &bond_info_seq_ops);
3306         if (!res) {
3307                 /* recover the pointer buried in proc_dir_entry data */
3308                 seq = file->private_data;
3309                 proc = PDE(inode);
3310                 seq->private = proc->data;
3311         }
3312
3313         return res;
3314 }
3315
3316 static const struct file_operations bond_info_fops = {
3317         .owner   = THIS_MODULE,
3318         .open    = bond_info_open,
3319         .read    = seq_read,
3320         .llseek  = seq_lseek,
3321         .release = seq_release,
3322 };
3323
3324 static void bond_create_proc_entry(struct bonding *bond)
3325 {
3326         struct net_device *bond_dev = bond->dev;
3327         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3328
3329         if (bn->proc_dir) {
3330                 bond->proc_entry = proc_create_data(bond_dev->name,
3331                                                     S_IRUGO, bn->proc_dir,
3332                                                     &bond_info_fops, bond);
3333                 if (bond->proc_entry == NULL)
3334                         pr_warning("Warning: Cannot create /proc/net/%s/%s\n",
3335                                    DRV_NAME, bond_dev->name);
3336                 else
3337                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3338         }
3339 }
3340
3341 static void bond_remove_proc_entry(struct bonding *bond)
3342 {
3343         struct net_device *bond_dev = bond->dev;
3344         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3345
3346         if (bn->proc_dir && bond->proc_entry) {
3347                 remove_proc_entry(bond->proc_file_name, bn->proc_dir);
3348                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3349                 bond->proc_entry = NULL;
3350         }
3351 }
3352
3353 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3354  * Caller must hold rtnl_lock.
3355  */
3356 static void __net_init bond_create_proc_dir(struct bond_net *bn)
3357 {
3358         if (!bn->proc_dir) {
3359                 bn->proc_dir = proc_mkdir(DRV_NAME, bn->net->proc_net);
3360                 if (!bn->proc_dir)
3361                         pr_warning("Warning: cannot create /proc/net/%s\n",
3362                                    DRV_NAME);
3363         }
3364 }
3365
3366 /* Destroy the bonding directory under /proc/net, if empty.
3367  * Caller must hold rtnl_lock.
3368  */
3369 static void __net_exit bond_destroy_proc_dir(struct bond_net *bn)
3370 {
3371         if (bn->proc_dir) {
3372                 remove_proc_entry(DRV_NAME, bn->net->proc_net);
3373                 bn->proc_dir = NULL;
3374         }
3375 }
3376
3377 #else /* !CONFIG_PROC_FS */
3378
3379 static void bond_create_proc_entry(struct bonding *bond)
3380 {
3381 }
3382
3383 static void bond_remove_proc_entry(struct bonding *bond)
3384 {
3385 }
3386
3387 static inline void bond_create_proc_dir(struct bond_net *bn)
3388 {
3389 }
3390
3391 static inline void bond_destroy_proc_dir(struct bond_net *bn)
3392 {
3393 }
3394
3395 #endif /* CONFIG_PROC_FS */
3396
3397
3398 /*-------------------------- netdev event handling --------------------------*/
3399
3400 /*
3401  * Change device name
3402  */
3403 static int bond_event_changename(struct bonding *bond)
3404 {
3405         bond_remove_proc_entry(bond);
3406         bond_create_proc_entry(bond);
3407
3408         return NOTIFY_DONE;
3409 }
3410
3411 static int bond_master_netdev_event(unsigned long event,
3412                                     struct net_device *bond_dev)
3413 {
3414         struct bonding *event_bond = netdev_priv(bond_dev);
3415
3416         switch (event) {
3417         case NETDEV_CHANGENAME:
3418                 return bond_event_changename(event_bond);
3419         default:
3420                 break;
3421         }
3422
3423         return NOTIFY_DONE;
3424 }
3425
3426 static int bond_slave_netdev_event(unsigned long event,
3427                                    struct net_device *slave_dev)
3428 {
3429         struct net_device *bond_dev = slave_dev->master;
3430         struct bonding *bond = netdev_priv(bond_dev);
3431
3432         switch (event) {
3433         case NETDEV_UNREGISTER:
3434                 if (bond_dev) {
3435                         if (bond->setup_by_slave)
3436                                 bond_release_and_destroy(bond_dev, slave_dev);
3437                         else
3438                                 bond_release(bond_dev, slave_dev);
3439                 }
3440                 break;
3441         case NETDEV_CHANGE:
3442                 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3443                         struct slave *slave;
3444
3445                         slave = bond_get_slave_by_dev(bond, slave_dev);
3446                         if (slave) {
3447                                 u16 old_speed = slave->speed;
3448                                 u16 old_duplex = slave->duplex;
3449
3450                                 bond_update_speed_duplex(slave);
3451
3452                                 if (bond_is_lb(bond))
3453                                         break;
3454
3455                                 if (old_speed != slave->speed)
3456                                         bond_3ad_adapter_speed_changed(slave);
3457                                 if (old_duplex != slave->duplex)
3458                                         bond_3ad_adapter_duplex_changed(slave);
3459                         }
3460                 }
3461
3462                 break;
3463         case NETDEV_DOWN:
3464                 /*
3465                  * ... Or is it this?
3466                  */
3467                 break;
3468         case NETDEV_CHANGEMTU:
3469                 /*
3470                  * TODO: Should slaves be allowed to
3471                  * independently alter their MTU?  For
3472                  * an active-backup bond, slaves need
3473                  * not be the same type of device, so
3474                  * MTUs may vary.  For other modes,
3475                  * slaves arguably should have the
3476                  * same MTUs. To do this, we'd need to
3477                  * take over the slave's change_mtu
3478                  * function for the duration of their
3479                  * servitude.
3480                  */
3481                 break;
3482         case NETDEV_CHANGENAME:
3483                 /*
3484                  * TODO: handle changing the primary's name
3485                  */
3486                 break;
3487         case NETDEV_FEAT_CHANGE:
3488                 bond_compute_features(bond);
3489                 break;
3490         default:
3491                 break;
3492         }
3493
3494         return NOTIFY_DONE;
3495 }
3496
3497 /*
3498  * bond_netdev_event: handle netdev notifier chain events.
3499  *
3500  * This function receives events for the netdev chain.  The caller (an
3501  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3502  * locks for us to safely manipulate the slave devices (RTNL lock,
3503  * dev_probe_lock).
3504  */
3505 static int bond_netdev_event(struct notifier_block *this,
3506                              unsigned long event, void *ptr)
3507 {
3508         struct net_device *event_dev = (struct net_device *)ptr;
3509
3510         pr_debug("event_dev: %s, event: %lx\n",
3511                  event_dev ? event_dev->name : "None",
3512                  event);
3513
3514         if (!(event_dev->priv_flags & IFF_BONDING))
3515                 return NOTIFY_DONE;
3516
3517         if (event_dev->flags & IFF_MASTER) {
3518                 pr_debug("IFF_MASTER\n");
3519                 return bond_master_netdev_event(event, event_dev);
3520         }
3521
3522         if (event_dev->flags & IFF_SLAVE) {
3523                 pr_debug("IFF_SLAVE\n");
3524                 return bond_slave_netdev_event(event, event_dev);
3525         }
3526
3527         return NOTIFY_DONE;
3528 }
3529
3530 /*
3531  * bond_inetaddr_event: handle inetaddr notifier chain events.
3532  *
3533  * We keep track of device IPs primarily to use as source addresses in
3534  * ARP monitor probes (rather than spewing out broadcasts all the time).
3535  *
3536  * We track one IP for the main device (if it has one), plus one per VLAN.
3537  */
3538 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3539 {
3540         struct in_ifaddr *ifa = ptr;
3541         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3542         struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3543         struct bonding *bond;
3544         struct vlan_entry *vlan;
3545
3546         list_for_each_entry(bond, &bn->dev_list, bond_list) {
3547                 if (bond->dev == event_dev) {
3548                         switch (event) {
3549                         case NETDEV_UP:
3550                                 bond->master_ip = ifa->ifa_local;
3551                                 return NOTIFY_OK;
3552                         case NETDEV_DOWN:
3553                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3554                                 return NOTIFY_OK;
3555                         default:
3556                                 return NOTIFY_DONE;
3557                         }
3558                 }
3559
3560                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3561                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3562                         if (vlan_dev == event_dev) {
3563                                 switch (event) {
3564                                 case NETDEV_UP:
3565                                         vlan->vlan_ip = ifa->ifa_local;
3566                                         return NOTIFY_OK;
3567                                 case NETDEV_DOWN:
3568                                         vlan->vlan_ip =
3569                                                 bond_glean_dev_ip(vlan_dev);
3570                                         return NOTIFY_OK;
3571                                 default:
3572                                         return NOTIFY_DONE;
3573                                 }
3574                         }
3575                 }
3576         }
3577         return NOTIFY_DONE;
3578 }
3579
3580 static struct notifier_block bond_netdev_notifier = {
3581         .notifier_call = bond_netdev_event,
3582 };
3583
3584 static struct notifier_block bond_inetaddr_notifier = {
3585         .notifier_call = bond_inetaddr_event,
3586 };
3587
3588 /*-------------------------- Packet type handling ---------------------------*/
3589
3590 /* register to receive lacpdus on a bond */
3591 static void bond_register_lacpdu(struct bonding *bond)
3592 {
3593         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3594
3595         /* initialize packet type */
3596         pk_type->type = PKT_TYPE_LACPDU;
3597         pk_type->dev = bond->dev;
3598         pk_type->func = bond_3ad_lacpdu_recv;
3599
3600         dev_add_pack(pk_type);
3601 }
3602
3603 /* unregister to receive lacpdus on a bond */
3604 static void bond_unregister_lacpdu(struct bonding *bond)
3605 {
3606         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3607 }
3608
3609 void bond_register_arp(struct bonding *bond)
3610 {
3611         struct packet_type *pt = &bond->arp_mon_pt;
3612
3613         if (pt->type)
3614                 return;
3615
3616         pt->type = htons(ETH_P_ARP);
3617         pt->dev = bond->dev;
3618         pt->func = bond_arp_rcv;
3619         dev_add_pack(pt);
3620 }
3621
3622 void bond_unregister_arp(struct bonding *bond)
3623 {
3624         struct packet_type *pt = &bond->arp_mon_pt;
3625
3626         dev_remove_pack(pt);
3627         pt->type = 0;
3628 }
3629
3630 /*---------------------------- Hashing Policies -----------------------------*/
3631
3632 /*
3633  * Hash for the output device based upon layer 2 and layer 3 data. If
3634  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3635  */
3636 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3637 {
3638         struct ethhdr *data = (struct ethhdr *)skb->data;
3639         struct iphdr *iph = ip_hdr(skb);
3640
3641         if (skb->protocol == htons(ETH_P_IP)) {
3642                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3643                         (data->h_dest[5] ^ data->h_source[5])) % count;
3644         }
3645
3646         return (data->h_dest[5] ^ data->h_source[5]) % count;
3647 }
3648
3649 /*
3650  * Hash for the output device based upon layer 3 and layer 4 data. If
3651  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3652  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3653  */
3654 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3655 {
3656         struct ethhdr *data = (struct ethhdr *)skb->data;
3657         struct iphdr *iph = ip_hdr(skb);
3658         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3659         int layer4_xor = 0;
3660
3661         if (skb->protocol == htons(ETH_P_IP)) {
3662                 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3663                     (iph->protocol == IPPROTO_TCP ||
3664                      iph->protocol == IPPROTO_UDP)) {
3665                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3666                 }
3667                 return (layer4_xor ^
3668                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3669
3670         }
3671
3672         return (data->h_dest[5] ^ data->h_source[5]) % count;
3673 }
3674
3675 /*
3676  * Hash for the output device based upon layer 2 data
3677  */
3678 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3679 {
3680         struct ethhdr *data = (struct ethhdr *)skb->data;
3681
3682         return (data->h_dest[5] ^ data->h_source[5]) % count;
3683 }
3684
3685 /*-------------------------- Device entry points ----------------------------*/
3686
3687 static int bond_open(struct net_device *bond_dev)
3688 {
3689         struct bonding *bond = netdev_priv(bond_dev);
3690
3691         bond->kill_timers = 0;
3692
3693         if (bond_is_lb(bond)) {
3694                 /* bond_alb_initialize must be called before the timer
3695                  * is started.
3696                  */
3697                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3698                         /* something went wrong - fail the open operation */
3699                         return -ENOMEM;
3700                 }
3701
3702                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3703                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3704         }
3705
3706         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3707                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3708                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3709         }
3710
3711         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3712                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3713                         INIT_DELAYED_WORK(&bond->arp_work,
3714                                           bond_activebackup_arp_mon);
3715                 else
3716                         INIT_DELAYED_WORK(&bond->arp_work,
3717                                           bond_loadbalance_arp_mon);
3718
3719                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3720                 if (bond->params.arp_validate)
3721                         bond_register_arp(bond);
3722         }
3723
3724         if (bond->params.mode == BOND_MODE_8023AD) {
3725                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3726                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3727                 /* register to receive LACPDUs */
3728                 bond_register_lacpdu(bond);
3729                 bond_3ad_initiate_agg_selection(bond, 1);
3730         }
3731
3732         return 0;
3733 }
3734
3735 static int bond_close(struct net_device *bond_dev)
3736 {
3737         struct bonding *bond = netdev_priv(bond_dev);
3738
3739         if (bond->params.mode == BOND_MODE_8023AD) {
3740                 /* Unregister the receive of LACPDUs */
3741                 bond_unregister_lacpdu(bond);
3742         }
3743
3744         if (bond->params.arp_validate)
3745                 bond_unregister_arp(bond);
3746
3747         write_lock_bh(&bond->lock);
3748
3749         bond->send_grat_arp = 0;
3750         bond->send_unsol_na = 0;
3751
3752         /* signal timers not to re-arm */
3753         bond->kill_timers = 1;
3754
3755         write_unlock_bh(&bond->lock);
3756
3757         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3758                 cancel_delayed_work(&bond->mii_work);
3759         }
3760
3761         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3762                 cancel_delayed_work(&bond->arp_work);
3763         }
3764
3765         switch (bond->params.mode) {
3766         case BOND_MODE_8023AD:
3767                 cancel_delayed_work(&bond->ad_work);
3768                 break;
3769         case BOND_MODE_TLB:
3770         case BOND_MODE_ALB:
3771                 cancel_delayed_work(&bond->alb_work);
3772                 break;
3773         default:
3774                 break;
3775         }
3776
3777
3778         if (bond_is_lb(bond)) {
3779                 /* Must be called only after all
3780                  * slaves have been released
3781                  */
3782                 bond_alb_deinitialize(bond);
3783         }
3784
3785         return 0;
3786 }
3787
3788 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3789 {
3790         struct bonding *bond = netdev_priv(bond_dev);
3791         struct net_device_stats *stats = &bond_dev->stats;
3792         struct net_device_stats local_stats;
3793         struct slave *slave;
3794         int i;
3795
3796         memset(&local_stats, 0, sizeof(struct net_device_stats));
3797
3798         read_lock_bh(&bond->lock);
3799
3800         bond_for_each_slave(bond, slave, i) {
3801                 const struct net_device_stats *sstats = dev_get_stats(slave->dev);
3802
3803                 local_stats.rx_packets += sstats->rx_packets;
3804                 local_stats.rx_bytes += sstats->rx_bytes;
3805                 local_stats.rx_errors += sstats->rx_errors;
3806                 local_stats.rx_dropped += sstats->rx_dropped;
3807
3808                 local_stats.tx_packets += sstats->tx_packets;
3809                 local_stats.tx_bytes += sstats->tx_bytes;
3810                 local_stats.tx_errors += sstats->tx_errors;
3811                 local_stats.tx_dropped += sstats->tx_dropped;
3812
3813                 local_stats.multicast += sstats->multicast;
3814                 local_stats.collisions += sstats->collisions;
3815
3816                 local_stats.rx_length_errors += sstats->rx_length_errors;
3817                 local_stats.rx_over_errors += sstats->rx_over_errors;
3818                 local_stats.rx_crc_errors += sstats->rx_crc_errors;
3819                 local_stats.rx_frame_errors += sstats->rx_frame_errors;
3820                 local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
3821                 local_stats.rx_missed_errors += sstats->rx_missed_errors;
3822
3823                 local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
3824                 local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
3825                 local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
3826                 local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3827                 local_stats.tx_window_errors += sstats->tx_window_errors;
3828         }
3829
3830         memcpy(stats, &local_stats, sizeof(struct net_device_stats));
3831
3832         read_unlock_bh(&bond->lock);
3833
3834         return stats;
3835 }
3836
3837 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3838 {
3839         struct net_device *slave_dev = NULL;
3840         struct ifbond k_binfo;
3841         struct ifbond __user *u_binfo = NULL;
3842         struct ifslave k_sinfo;
3843         struct ifslave __user *u_sinfo = NULL;
3844         struct mii_ioctl_data *mii = NULL;
3845         int res = 0;
3846
3847         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3848
3849         switch (cmd) {
3850         case SIOCGMIIPHY:
3851                 mii = if_mii(ifr);
3852                 if (!mii)
3853                         return -EINVAL;
3854
3855                 mii->phy_id = 0;
3856                 /* Fall Through */
3857         case SIOCGMIIREG:
3858                 /*
3859                  * We do this again just in case we were called by SIOCGMIIREG
3860                  * instead of SIOCGMIIPHY.
3861                  */
3862                 mii = if_mii(ifr);
3863                 if (!mii)
3864                         return -EINVAL;
3865
3866
3867                 if (mii->reg_num == 1) {
3868                         struct bonding *bond = netdev_priv(bond_dev);
3869                         mii->val_out = 0;
3870                         read_lock(&bond->lock);
3871                         read_lock(&bond->curr_slave_lock);
3872                         if (netif_carrier_ok(bond->dev))
3873                                 mii->val_out = BMSR_LSTATUS;
3874
3875                         read_unlock(&bond->curr_slave_lock);
3876                         read_unlock(&bond->lock);
3877                 }
3878
3879                 return 0;
3880         case BOND_INFO_QUERY_OLD:
3881         case SIOCBONDINFOQUERY:
3882                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3883
3884                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3885                         return -EFAULT;
3886
3887                 res = bond_info_query(bond_dev, &k_binfo);
3888                 if (res == 0 &&
3889                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3890                         return -EFAULT;
3891
3892                 return res;
3893         case BOND_SLAVE_INFO_QUERY_OLD:
3894         case SIOCBONDSLAVEINFOQUERY:
3895                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3896
3897                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3898                         return -EFAULT;
3899
3900                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3901                 if (res == 0 &&
3902                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3903                         return -EFAULT;
3904
3905                 return res;
3906         default:
3907                 /* Go on */
3908                 break;
3909         }
3910
3911         if (!capable(CAP_NET_ADMIN))
3912                 return -EPERM;
3913
3914         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3915
3916         pr_debug("slave_dev=%p:\n", slave_dev);
3917
3918         if (!slave_dev)
3919                 res = -ENODEV;
3920         else {
3921                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3922                 switch (cmd) {
3923                 case BOND_ENSLAVE_OLD:
3924                 case SIOCBONDENSLAVE:
3925                         res = bond_enslave(bond_dev, slave_dev);
3926                         break;
3927                 case BOND_RELEASE_OLD:
3928                 case SIOCBONDRELEASE:
3929                         res = bond_release(bond_dev, slave_dev);
3930                         break;
3931                 case BOND_SETHWADDR_OLD:
3932                 case SIOCBONDSETHWADDR:
3933                         res = bond_sethwaddr(bond_dev, slave_dev);
3934                         break;
3935                 case BOND_CHANGE_ACTIVE_OLD:
3936                 case SIOCBONDCHANGEACTIVE:
3937                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3938                         break;
3939                 default:
3940                         res = -EOPNOTSUPP;
3941                 }
3942
3943                 dev_put(slave_dev);
3944         }
3945
3946         return res;
3947 }
3948
3949 static bool bond_addr_in_mc_list(unsigned char *addr,
3950                                  struct netdev_hw_addr_list *list,
3951                                  int addrlen)
3952 {
3953         struct netdev_hw_addr *ha;
3954
3955         netdev_hw_addr_list_for_each(ha, list)
3956                 if (!memcmp(ha->addr, addr, addrlen))
3957                         return true;
3958
3959         return false;
3960 }
3961
3962 static void bond_set_multicast_list(struct net_device *bond_dev)
3963 {
3964         struct bonding *bond = netdev_priv(bond_dev);
3965         struct netdev_hw_addr *ha;
3966         bool found;
3967
3968         /*
3969          * Do promisc before checking multicast_mode
3970          */
3971         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
3972                 /*
3973                  * FIXME: Need to handle the error when one of the multi-slaves
3974                  * encounters error.
3975                  */
3976                 bond_set_promiscuity(bond, 1);
3977
3978
3979         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
3980                 bond_set_promiscuity(bond, -1);
3981
3982
3983         /* set allmulti flag to slaves */
3984         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
3985                 /*
3986                  * FIXME: Need to handle the error when one of the multi-slaves
3987                  * encounters error.
3988                  */
3989                 bond_set_allmulti(bond, 1);
3990
3991
3992         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
3993                 bond_set_allmulti(bond, -1);
3994
3995
3996         read_lock(&bond->lock);
3997
3998         bond->flags = bond_dev->flags;
3999
4000         /* looking for addresses to add to slaves' mc list */
4001         netdev_for_each_mc_addr(ha, bond_dev) {
4002                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
4003                                              bond_dev->addr_len);
4004                 if (!found)
4005                         bond_mc_add(bond, ha->addr);
4006         }
4007
4008         /* looking for addresses to delete from slaves' list */
4009         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
4010                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
4011                                              bond_dev->addr_len);
4012                 if (!found)
4013                         bond_mc_del(bond, ha->addr);
4014         }
4015
4016         /* save master's multicast list */
4017         __hw_addr_flush(&bond->mc_list);
4018         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
4019                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
4020
4021         read_unlock(&bond->lock);
4022 }
4023
4024 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
4025 {
4026         struct bonding *bond = netdev_priv(dev);
4027         struct slave *slave = bond->first_slave;
4028
4029         if (slave) {
4030                 const struct net_device_ops *slave_ops
4031                         = slave->dev->netdev_ops;
4032                 if (slave_ops->ndo_neigh_setup)
4033                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
4034         }
4035         return 0;
4036 }
4037
4038 /*
4039  * Change the MTU of all of a master's slaves to match the master
4040  */
4041 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4042 {
4043         struct bonding *bond = netdev_priv(bond_dev);
4044         struct slave *slave, *stop_at;
4045         int res = 0;
4046         int i;
4047
4048         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
4049                  (bond_dev ? bond_dev->name : "None"), new_mtu);
4050
4051         /* Can't hold bond->lock with bh disabled here since
4052          * some base drivers panic. On the other hand we can't
4053          * hold bond->lock without bh disabled because we'll
4054          * deadlock. The only solution is to rely on the fact
4055          * that we're under rtnl_lock here, and the slaves
4056          * list won't change. This doesn't solve the problem
4057          * of setting the slave's MTU while it is
4058          * transmitting, but the assumption is that the base
4059          * driver can handle that.
4060          *
4061          * TODO: figure out a way to safely iterate the slaves
4062          * list, but without holding a lock around the actual
4063          * call to the base driver.
4064          */
4065
4066         bond_for_each_slave(bond, slave, i) {
4067                 pr_debug("s %p s->p %p c_m %p\n",
4068                          slave,
4069                          slave->prev,
4070                          slave->dev->netdev_ops->ndo_change_mtu);
4071
4072                 res = dev_set_mtu(slave->dev, new_mtu);
4073
4074                 if (res) {
4075                         /* If we failed to set the slave's mtu to the new value
4076                          * we must abort the operation even in ACTIVE_BACKUP
4077                          * mode, because if we allow the backup slaves to have
4078                          * different mtu values than the active slave we'll
4079                          * need to change their mtu when doing a failover. That
4080                          * means changing their mtu from timer context, which
4081                          * is probably not a good idea.
4082                          */
4083                         pr_debug("err %d %s\n", res, slave->dev->name);
4084                         goto unwind;
4085                 }
4086         }
4087
4088         bond_dev->mtu = new_mtu;
4089
4090         return 0;
4091
4092 unwind:
4093         /* unwind from head to the slave that failed */
4094         stop_at = slave;
4095         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4096                 int tmp_res;
4097
4098                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4099                 if (tmp_res) {
4100                         pr_debug("unwind err %d dev %s\n",
4101                                  tmp_res, slave->dev->name);
4102                 }
4103         }
4104
4105         return res;
4106 }
4107
4108 /*
4109  * Change HW address
4110  *
4111  * Note that many devices must be down to change the HW address, and
4112  * downing the master releases all slaves.  We can make bonds full of
4113  * bonding devices to test this, however.
4114  */
4115 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4116 {
4117         struct bonding *bond = netdev_priv(bond_dev);
4118         struct sockaddr *sa = addr, tmp_sa;
4119         struct slave *slave, *stop_at;
4120         int res = 0;
4121         int i;
4122
4123         if (bond->params.mode == BOND_MODE_ALB)
4124                 return bond_alb_set_mac_address(bond_dev, addr);
4125
4126
4127         pr_debug("bond=%p, name=%s\n",
4128                  bond, bond_dev ? bond_dev->name : "None");
4129
4130         /*
4131          * If fail_over_mac is set to active, do nothing and return
4132          * success.  Returning an error causes ifenslave to fail.
4133          */
4134         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4135                 return 0;
4136
4137         if (!is_valid_ether_addr(sa->sa_data))
4138                 return -EADDRNOTAVAIL;
4139
4140         /* Can't hold bond->lock with bh disabled here since
4141          * some base drivers panic. On the other hand we can't
4142          * hold bond->lock without bh disabled because we'll
4143          * deadlock. The only solution is to rely on the fact
4144          * that we're under rtnl_lock here, and the slaves
4145          * list won't change. This doesn't solve the problem
4146          * of setting the slave's hw address while it is
4147          * transmitting, but the assumption is that the base
4148          * driver can handle that.
4149          *
4150          * TODO: figure out a way to safely iterate the slaves
4151          * list, but without holding a lock around the actual
4152          * call to the base driver.
4153          */
4154
4155         bond_for_each_slave(bond, slave, i) {
4156                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4157                 pr_debug("slave %p %s\n", slave, slave->dev->name);
4158
4159                 if (slave_ops->ndo_set_mac_address == NULL) {
4160                         res = -EOPNOTSUPP;
4161                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4162                         goto unwind;
4163                 }
4164
4165                 res = dev_set_mac_address(slave->dev, addr);
4166                 if (res) {
4167                         /* TODO: consider downing the slave
4168                          * and retry ?
4169                          * User should expect communications
4170                          * breakage anyway until ARP finish
4171                          * updating, so...
4172                          */
4173                         pr_debug("err %d %s\n", res, slave->dev->name);
4174                         goto unwind;
4175                 }
4176         }
4177
4178         /* success */
4179         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4180         return 0;
4181
4182 unwind:
4183         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4184         tmp_sa.sa_family = bond_dev->type;
4185
4186         /* unwind from head to the slave that failed */
4187         stop_at = slave;
4188         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4189                 int tmp_res;
4190
4191                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4192                 if (tmp_res) {
4193                         pr_debug("unwind err %d dev %s\n",
4194                                  tmp_res, slave->dev->name);
4195                 }
4196         }
4197
4198         return res;
4199 }
4200
4201 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4202 {
4203         struct bonding *bond = netdev_priv(bond_dev);
4204         struct slave *slave, *start_at;
4205         int i, slave_no, res = 1;
4206         struct iphdr *iph = ip_hdr(skb);
4207
4208         read_lock(&bond->lock);
4209
4210         if (!BOND_IS_OK(bond))
4211                 goto out;
4212         /*
4213          * Start with the curr_active_slave that joined the bond as the
4214          * default for sending IGMP traffic.  For failover purposes one
4215          * needs to maintain some consistency for the interface that will
4216          * send the join/membership reports.  The curr_active_slave found
4217          * will send all of this type of traffic.
4218          */
4219         if ((iph->protocol == IPPROTO_IGMP) &&
4220             (skb->protocol == htons(ETH_P_IP))) {
4221
4222                 read_lock(&bond->curr_slave_lock);
4223                 slave = bond->curr_active_slave;
4224                 read_unlock(&bond->curr_slave_lock);
4225
4226                 if (!slave)
4227                         goto out;
4228         } else {
4229                 /*
4230                  * Concurrent TX may collide on rr_tx_counter; we accept
4231                  * that as being rare enough not to justify using an
4232                  * atomic op here.
4233                  */
4234                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4235
4236                 bond_for_each_slave(bond, slave, i) {
4237                         slave_no--;
4238                         if (slave_no < 0)
4239                                 break;
4240                 }
4241         }
4242
4243         start_at = slave;
4244         bond_for_each_slave_from(bond, slave, i, start_at) {
4245                 if (IS_UP(slave->dev) &&
4246                     (slave->link == BOND_LINK_UP) &&
4247                     (slave->state == BOND_STATE_ACTIVE)) {
4248                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4249                         break;
4250                 }
4251         }
4252
4253 out:
4254         if (res) {
4255                 /* no suitable interface, frame not sent */
4256                 dev_kfree_skb(skb);
4257         }
4258         read_unlock(&bond->lock);
4259         return NETDEV_TX_OK;
4260 }
4261
4262
4263 /*
4264  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4265  * the bond has a usable interface.
4266  */
4267 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4268 {
4269         struct bonding *bond = netdev_priv(bond_dev);
4270         int res = 1;
4271
4272         read_lock(&bond->lock);
4273         read_lock(&bond->curr_slave_lock);
4274
4275         if (!BOND_IS_OK(bond))
4276                 goto out;
4277
4278         if (!bond->curr_active_slave)
4279                 goto out;
4280
4281         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4282
4283 out:
4284         if (res)
4285                 /* no suitable interface, frame not sent */
4286                 dev_kfree_skb(skb);
4287
4288         read_unlock(&bond->curr_slave_lock);
4289         read_unlock(&bond->lock);
4290         return NETDEV_TX_OK;
4291 }
4292
4293 /*
4294  * In bond_xmit_xor() , we determine the output device by using a pre-
4295  * determined xmit_hash_policy(), If the selected device is not enabled,
4296  * find the next active slave.
4297  */
4298 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4299 {
4300         struct bonding *bond = netdev_priv(bond_dev);
4301         struct slave *slave, *start_at;
4302         int slave_no;
4303         int i;
4304         int res = 1;
4305
4306         read_lock(&bond->lock);
4307
4308         if (!BOND_IS_OK(bond))
4309                 goto out;
4310
4311         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4312
4313         bond_for_each_slave(bond, slave, i) {
4314                 slave_no--;
4315                 if (slave_no < 0)
4316                         break;
4317         }
4318
4319         start_at = slave;
4320
4321         bond_for_each_slave_from(bond, slave, i, start_at) {
4322                 if (IS_UP(slave->dev) &&
4323                     (slave->link == BOND_LINK_UP) &&
4324                     (slave->state == BOND_STATE_ACTIVE)) {
4325                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4326                         break;
4327                 }
4328         }
4329
4330 out:
4331         if (res) {
4332                 /* no suitable interface, frame not sent */
4333                 dev_kfree_skb(skb);
4334         }
4335         read_unlock(&bond->lock);
4336         return NETDEV_TX_OK;
4337 }
4338
4339 /*
4340  * in broadcast mode, we send everything to all usable interfaces.
4341  */
4342 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4343 {
4344         struct bonding *bond = netdev_priv(bond_dev);
4345         struct slave *slave, *start_at;
4346         struct net_device *tx_dev = NULL;
4347         int i;
4348         int res = 1;
4349
4350         read_lock(&bond->lock);
4351
4352         if (!BOND_IS_OK(bond))
4353                 goto out;
4354
4355         read_lock(&bond->curr_slave_lock);
4356         start_at = bond->curr_active_slave;
4357         read_unlock(&bond->curr_slave_lock);
4358
4359         if (!start_at)
4360                 goto out;
4361
4362         bond_for_each_slave_from(bond, slave, i, start_at) {
4363                 if (IS_UP(slave->dev) &&
4364                     (slave->link == BOND_LINK_UP) &&
4365                     (slave->state == BOND_STATE_ACTIVE)) {
4366                         if (tx_dev) {
4367                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4368                                 if (!skb2) {
4369                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4370                                                bond_dev->name);
4371                                         continue;
4372                                 }
4373
4374                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4375                                 if (res) {
4376                                         dev_kfree_skb(skb2);
4377                                         continue;
4378                                 }
4379                         }
4380                         tx_dev = slave->dev;
4381                 }
4382         }
4383
4384         if (tx_dev)
4385                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4386
4387 out:
4388         if (res)
4389                 /* no suitable interface, frame not sent */
4390                 dev_kfree_skb(skb);
4391
4392         /* frame sent to all suitable interfaces */
4393         read_unlock(&bond->lock);
4394         return NETDEV_TX_OK;
4395 }
4396
4397 /*------------------------- Device initialization ---------------------------*/
4398
4399 static void bond_set_xmit_hash_policy(struct bonding *bond)
4400 {
4401         switch (bond->params.xmit_policy) {
4402         case BOND_XMIT_POLICY_LAYER23:
4403                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4404                 break;
4405         case BOND_XMIT_POLICY_LAYER34:
4406                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4407                 break;
4408         case BOND_XMIT_POLICY_LAYER2:
4409         default:
4410                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4411                 break;
4412         }
4413 }
4414
4415 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4416 {
4417         const struct bonding *bond = netdev_priv(dev);
4418
4419         switch (bond->params.mode) {
4420         case BOND_MODE_ROUNDROBIN:
4421                 return bond_xmit_roundrobin(skb, dev);
4422         case BOND_MODE_ACTIVEBACKUP:
4423                 return bond_xmit_activebackup(skb, dev);
4424         case BOND_MODE_XOR:
4425                 return bond_xmit_xor(skb, dev);
4426         case BOND_MODE_BROADCAST:
4427                 return bond_xmit_broadcast(skb, dev);
4428         case BOND_MODE_8023AD:
4429                 return bond_3ad_xmit_xor(skb, dev);
4430         case BOND_MODE_ALB:
4431         case BOND_MODE_TLB:
4432                 return bond_alb_xmit(skb, dev);
4433         default:
4434                 /* Should never happen, mode already checked */
4435                 pr_err("%s: Error: Unknown bonding mode %d\n",
4436                        dev->name, bond->params.mode);
4437                 WARN_ON_ONCE(1);
4438                 dev_kfree_skb(skb);
4439                 return NETDEV_TX_OK;
4440         }
4441 }
4442
4443
4444 /*
4445  * set bond mode specific net device operations
4446  */
4447 void bond_set_mode_ops(struct bonding *bond, int mode)
4448 {
4449         struct net_device *bond_dev = bond->dev;
4450
4451         switch (mode) {
4452         case BOND_MODE_ROUNDROBIN:
4453                 break;
4454         case BOND_MODE_ACTIVEBACKUP:
4455                 break;
4456         case BOND_MODE_XOR:
4457                 bond_set_xmit_hash_policy(bond);
4458                 break;
4459         case BOND_MODE_BROADCAST:
4460                 break;
4461         case BOND_MODE_8023AD:
4462                 bond_set_master_3ad_flags(bond);
4463                 bond_set_xmit_hash_policy(bond);
4464                 break;
4465         case BOND_MODE_ALB:
4466                 bond_set_master_alb_flags(bond);
4467                 /* FALLTHRU */
4468         case BOND_MODE_TLB:
4469                 break;
4470         default:
4471                 /* Should never happen, mode already checked */
4472                 pr_err("%s: Error: Unknown bonding mode %d\n",
4473                        bond_dev->name, mode);
4474                 break;
4475         }
4476 }
4477
4478 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4479                                     struct ethtool_drvinfo *drvinfo)
4480 {
4481         strncpy(drvinfo->driver, DRV_NAME, 32);
4482         strncpy(drvinfo->version, DRV_VERSION, 32);
4483         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4484 }
4485
4486 static const struct ethtool_ops bond_ethtool_ops = {
4487         .get_drvinfo            = bond_ethtool_get_drvinfo,
4488         .get_link               = ethtool_op_get_link,
4489         .get_tx_csum            = ethtool_op_get_tx_csum,
4490         .get_sg                 = ethtool_op_get_sg,
4491         .get_tso                = ethtool_op_get_tso,
4492         .get_ufo                = ethtool_op_get_ufo,
4493         .get_flags              = ethtool_op_get_flags,
4494 };
4495
4496 static const struct net_device_ops bond_netdev_ops = {
4497         .ndo_init               = bond_init,
4498         .ndo_uninit             = bond_uninit,
4499         .ndo_open               = bond_open,
4500         .ndo_stop               = bond_close,
4501         .ndo_start_xmit         = bond_start_xmit,
4502         .ndo_get_stats          = bond_get_stats,
4503         .ndo_do_ioctl           = bond_do_ioctl,
4504         .ndo_set_multicast_list = bond_set_multicast_list,
4505         .ndo_change_mtu         = bond_change_mtu,
4506         .ndo_set_mac_address    = bond_set_mac_address,
4507         .ndo_neigh_setup        = bond_neigh_setup,
4508         .ndo_vlan_rx_register   = bond_vlan_rx_register,
4509         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4510         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4511 #ifdef CONFIG_NET_POLL_CONTROLLER
4512         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4513         .ndo_poll_controller    = bond_poll_controller,
4514 #endif
4515 };
4516
4517 static void bond_destructor(struct net_device *bond_dev)
4518 {
4519         struct bonding *bond = netdev_priv(bond_dev);
4520         if (bond->wq)
4521                 destroy_workqueue(bond->wq);
4522         free_netdev(bond_dev);
4523 }
4524
4525 static void bond_setup(struct net_device *bond_dev)
4526 {
4527         struct bonding *bond = netdev_priv(bond_dev);
4528
4529         /* initialize rwlocks */
4530         rwlock_init(&bond->lock);
4531         rwlock_init(&bond->curr_slave_lock);
4532
4533         bond->params = bonding_defaults;
4534
4535         /* Initialize pointers */
4536         bond->dev = bond_dev;
4537         INIT_LIST_HEAD(&bond->vlan_list);
4538
4539         /* Initialize the device entry points */
4540         ether_setup(bond_dev);
4541         bond_dev->netdev_ops = &bond_netdev_ops;
4542         bond_dev->ethtool_ops = &bond_ethtool_ops;
4543         bond_set_mode_ops(bond, bond->params.mode);
4544
4545         bond_dev->destructor = bond_destructor;
4546
4547         /* Initialize the device options */
4548         bond_dev->tx_queue_len = 0;
4549         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4550         bond_dev->priv_flags |= IFF_BONDING;
4551         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
4552
4553         if (bond->params.arp_interval)
4554                 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4555
4556         /* At first, we block adding VLANs. That's the only way to
4557          * prevent problems that occur when adding VLANs over an
4558          * empty bond. The block will be removed once non-challenged
4559          * slaves are enslaved.
4560          */
4561         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4562
4563         /* don't acquire bond device's netif_tx_lock when
4564          * transmitting */
4565         bond_dev->features |= NETIF_F_LLTX;
4566
4567         /* By default, we declare the bond to be fully
4568          * VLAN hardware accelerated capable. Special
4569          * care is taken in the various xmit functions
4570          * when there are slaves that are not hw accel
4571          * capable
4572          */
4573         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4574                                NETIF_F_HW_VLAN_RX |
4575                                NETIF_F_HW_VLAN_FILTER);
4576
4577 }
4578
4579 static void bond_work_cancel_all(struct bonding *bond)
4580 {
4581         write_lock_bh(&bond->lock);
4582         bond->kill_timers = 1;
4583         write_unlock_bh(&bond->lock);
4584
4585         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4586                 cancel_delayed_work(&bond->mii_work);
4587
4588         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4589                 cancel_delayed_work(&bond->arp_work);
4590
4591         if (bond->params.mode == BOND_MODE_ALB &&
4592             delayed_work_pending(&bond->alb_work))
4593                 cancel_delayed_work(&bond->alb_work);
4594
4595         if (bond->params.mode == BOND_MODE_8023AD &&
4596             delayed_work_pending(&bond->ad_work))
4597                 cancel_delayed_work(&bond->ad_work);
4598 }
4599
4600 /*
4601 * Destroy a bonding device.
4602 * Must be under rtnl_lock when this function is called.
4603 */
4604 static void bond_uninit(struct net_device *bond_dev)
4605 {
4606         struct bonding *bond = netdev_priv(bond_dev);
4607
4608         bond_netpoll_cleanup(bond_dev);
4609
4610         /* Release the bonded slaves */
4611         bond_release_all(bond_dev);
4612
4613         list_del(&bond->bond_list);
4614
4615         bond_work_cancel_all(bond);
4616
4617         bond_remove_proc_entry(bond);
4618
4619         __hw_addr_flush(&bond->mc_list);
4620 }
4621
4622 /*------------------------- Module initialization ---------------------------*/
4623
4624 /*
4625  * Convert string input module parms.  Accept either the
4626  * number of the mode or its string name.  A bit complicated because
4627  * some mode names are substrings of other names, and calls from sysfs
4628  * may have whitespace in the name (trailing newlines, for example).
4629  */
4630 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4631 {
4632         int modeint = -1, i, rv;
4633         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4634
4635         for (p = (char *)buf; *p; p++)
4636                 if (!(isdigit(*p) || isspace(*p)))
4637                         break;
4638
4639         if (*p)
4640                 rv = sscanf(buf, "%20s", modestr);
4641         else
4642                 rv = sscanf(buf, "%d", &modeint);
4643
4644         if (!rv)
4645                 return -1;
4646
4647         for (i = 0; tbl[i].modename; i++) {
4648                 if (modeint == tbl[i].mode)
4649                         return tbl[i].mode;
4650                 if (strcmp(modestr, tbl[i].modename) == 0)
4651                         return tbl[i].mode;
4652         }
4653
4654         return -1;
4655 }
4656
4657 static int bond_check_params(struct bond_params *params)
4658 {
4659         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4660
4661         /*
4662          * Convert string parameters.
4663          */
4664         if (mode) {
4665                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4666                 if (bond_mode == -1) {
4667                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4668                                mode == NULL ? "NULL" : mode);
4669                         return -EINVAL;
4670                 }
4671         }
4672
4673         if (xmit_hash_policy) {
4674                 if ((bond_mode != BOND_MODE_XOR) &&
4675                     (bond_mode != BOND_MODE_8023AD)) {
4676                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4677                                bond_mode_name(bond_mode));
4678                 } else {
4679                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4680                                                         xmit_hashtype_tbl);
4681                         if (xmit_hashtype == -1) {
4682                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4683                                        xmit_hash_policy == NULL ? "NULL" :
4684                                        xmit_hash_policy);
4685                                 return -EINVAL;
4686                         }
4687                 }
4688         }
4689
4690         if (lacp_rate) {
4691                 if (bond_mode != BOND_MODE_8023AD) {
4692                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4693                                 bond_mode_name(bond_mode));
4694                 } else {
4695                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4696                         if (lacp_fast == -1) {
4697                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4698                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4699                                 return -EINVAL;
4700                         }
4701                 }
4702         }
4703
4704         if (ad_select) {
4705                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4706                 if (params->ad_select == -1) {
4707                         pr_err("Error: Invalid ad_select \"%s\"\n",
4708                                ad_select == NULL ? "NULL" : ad_select);
4709                         return -EINVAL;
4710                 }
4711
4712                 if (bond_mode != BOND_MODE_8023AD) {
4713                         pr_warning("ad_select param only affects 802.3ad mode\n");
4714                 }
4715         } else {
4716                 params->ad_select = BOND_AD_STABLE;
4717         }
4718
4719         if (max_bonds < 0) {
4720                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4721                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4722                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4723         }
4724
4725         if (miimon < 0) {
4726                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4727                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4728                 miimon = BOND_LINK_MON_INTERV;
4729         }
4730
4731         if (updelay < 0) {
4732                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4733                            updelay, INT_MAX);
4734                 updelay = 0;
4735         }
4736
4737         if (downdelay < 0) {
4738                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4739                            downdelay, INT_MAX);
4740                 downdelay = 0;
4741         }
4742
4743         if ((use_carrier != 0) && (use_carrier != 1)) {
4744                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4745                            use_carrier);
4746                 use_carrier = 1;
4747         }
4748
4749         if (num_grat_arp < 0 || num_grat_arp > 255) {
4750                 pr_warning("Warning: num_grat_arp (%d) not in range 0-255 so it was reset to 1\n",
4751                            num_grat_arp);
4752                 num_grat_arp = 1;
4753         }
4754
4755         if (num_unsol_na < 0 || num_unsol_na > 255) {
4756                 pr_warning("Warning: num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4757                            num_unsol_na);
4758                 num_unsol_na = 1;
4759         }
4760
4761         /* reset values for 802.3ad */
4762         if (bond_mode == BOND_MODE_8023AD) {
4763                 if (!miimon) {
4764                         pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4765                         pr_warning("Forcing miimon to 100msec\n");
4766                         miimon = 100;
4767                 }
4768         }
4769
4770         /* reset values for TLB/ALB */
4771         if ((bond_mode == BOND_MODE_TLB) ||
4772             (bond_mode == BOND_MODE_ALB)) {
4773                 if (!miimon) {
4774                         pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n");
4775                         pr_warning("Forcing miimon to 100msec\n");
4776                         miimon = 100;
4777                 }
4778         }
4779
4780         if (bond_mode == BOND_MODE_ALB) {
4781                 pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
4782                           updelay);
4783         }
4784
4785         if (!miimon) {
4786                 if (updelay || downdelay) {
4787                         /* just warn the user the up/down delay will have
4788                          * no effect since miimon is zero...
4789                          */
4790                         pr_warning("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4791                                    updelay, downdelay);
4792                 }
4793         } else {
4794                 /* don't allow arp monitoring */
4795                 if (arp_interval) {
4796                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4797                                    miimon, arp_interval);
4798                         arp_interval = 0;
4799                 }
4800
4801                 if ((updelay % miimon) != 0) {
4802                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4803                                    updelay, miimon,
4804                                    (updelay / miimon) * miimon);
4805                 }
4806
4807                 updelay /= miimon;
4808
4809                 if ((downdelay % miimon) != 0) {
4810                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4811                                    downdelay, miimon,
4812                                    (downdelay / miimon) * miimon);
4813                 }
4814
4815                 downdelay /= miimon;
4816         }
4817
4818         if (arp_interval < 0) {
4819                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4820                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4821                 arp_interval = BOND_LINK_ARP_INTERV;
4822         }
4823
4824         for (arp_ip_count = 0;
4825              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4826              arp_ip_count++) {
4827                 /* not complete check, but should be good enough to
4828                    catch mistakes */
4829                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4830                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4831                                    arp_ip_target[arp_ip_count]);
4832                         arp_interval = 0;
4833                 } else {
4834                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4835                         arp_target[arp_ip_count] = ip;
4836                 }
4837         }
4838
4839         if (arp_interval && !arp_ip_count) {
4840                 /* don't allow arping if no arp_ip_target given... */
4841                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4842                            arp_interval);
4843                 arp_interval = 0;
4844         }
4845
4846         if (arp_validate) {
4847                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4848                         pr_err("arp_validate only supported in active-backup mode\n");
4849                         return -EINVAL;
4850                 }
4851                 if (!arp_interval) {
4852                         pr_err("arp_validate requires arp_interval\n");
4853                         return -EINVAL;
4854                 }
4855
4856                 arp_validate_value = bond_parse_parm(arp_validate,
4857                                                      arp_validate_tbl);
4858                 if (arp_validate_value == -1) {
4859                         pr_err("Error: invalid arp_validate \"%s\"\n",
4860                                arp_validate == NULL ? "NULL" : arp_validate);
4861                         return -EINVAL;
4862                 }
4863         } else
4864                 arp_validate_value = 0;
4865
4866         if (miimon) {
4867                 pr_info("MII link monitoring set to %d ms\n", miimon);
4868         } else if (arp_interval) {
4869                 int i;
4870
4871                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4872                         arp_interval,
4873                         arp_validate_tbl[arp_validate_value].modename,
4874                         arp_ip_count);
4875
4876                 for (i = 0; i < arp_ip_count; i++)
4877                         pr_info(" %s", arp_ip_target[i]);
4878
4879                 pr_info("\n");
4880
4881         } else if (max_bonds) {
4882                 /* miimon and arp_interval not set, we need one so things
4883                  * work as expected, see bonding.txt for details
4884                  */
4885                 pr_warning("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details.\n");
4886         }
4887
4888         if (primary && !USES_PRIMARY(bond_mode)) {
4889                 /* currently, using a primary only makes sense
4890                  * in active backup, TLB or ALB modes
4891                  */
4892                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4893                            primary, bond_mode_name(bond_mode));
4894                 primary = NULL;
4895         }
4896
4897         if (primary && primary_reselect) {
4898                 primary_reselect_value = bond_parse_parm(primary_reselect,
4899                                                          pri_reselect_tbl);
4900                 if (primary_reselect_value == -1) {
4901                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4902                                primary_reselect ==
4903                                         NULL ? "NULL" : primary_reselect);
4904                         return -EINVAL;
4905                 }
4906         } else {
4907                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4908         }
4909
4910         if (fail_over_mac) {
4911                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4912                                                       fail_over_mac_tbl);
4913                 if (fail_over_mac_value == -1) {
4914                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4915                                arp_validate == NULL ? "NULL" : arp_validate);
4916                         return -EINVAL;
4917                 }
4918
4919                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4920                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4921         } else {
4922                 fail_over_mac_value = BOND_FOM_NONE;
4923         }
4924
4925         /* fill params struct with the proper values */
4926         params->mode = bond_mode;
4927         params->xmit_policy = xmit_hashtype;
4928         params->miimon = miimon;
4929         params->num_grat_arp = num_grat_arp;
4930         params->num_unsol_na = num_unsol_na;
4931         params->arp_interval = arp_interval;
4932         params->arp_validate = arp_validate_value;
4933         params->updelay = updelay;
4934         params->downdelay = downdelay;
4935         params->use_carrier = use_carrier;
4936         params->lacp_fast = lacp_fast;
4937         params->primary[0] = 0;
4938         params->primary_reselect = primary_reselect_value;
4939         params->fail_over_mac = fail_over_mac_value;
4940
4941         if (primary) {
4942                 strncpy(params->primary, primary, IFNAMSIZ);
4943                 params->primary[IFNAMSIZ - 1] = 0;
4944         }
4945
4946         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4947
4948         return 0;
4949 }
4950
4951 static struct lock_class_key bonding_netdev_xmit_lock_key;
4952 static struct lock_class_key bonding_netdev_addr_lock_key;
4953
4954 static void bond_set_lockdep_class_one(struct net_device *dev,
4955                                        struct netdev_queue *txq,
4956                                        void *_unused)
4957 {
4958         lockdep_set_class(&txq->_xmit_lock,
4959                           &bonding_netdev_xmit_lock_key);
4960 }
4961
4962 static void bond_set_lockdep_class(struct net_device *dev)
4963 {
4964         lockdep_set_class(&dev->addr_list_lock,
4965                           &bonding_netdev_addr_lock_key);
4966         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4967 }
4968
4969 /*
4970  * Called from registration process
4971  */
4972 static int bond_init(struct net_device *bond_dev)
4973 {
4974         struct bonding *bond = netdev_priv(bond_dev);
4975         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4976
4977         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4978
4979         bond->wq = create_singlethread_workqueue(bond_dev->name);
4980         if (!bond->wq)
4981                 return -ENOMEM;
4982
4983         bond_set_lockdep_class(bond_dev);
4984
4985         netif_carrier_off(bond_dev);
4986
4987         bond_create_proc_entry(bond);
4988         list_add_tail(&bond->bond_list, &bn->dev_list);
4989
4990         bond_prepare_sysfs_group(bond);
4991
4992         __hw_addr_init(&bond->mc_list);
4993         return 0;
4994 }
4995
4996 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4997 {
4998         if (tb[IFLA_ADDRESS]) {
4999                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
5000                         return -EINVAL;
5001                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
5002                         return -EADDRNOTAVAIL;
5003         }
5004         return 0;
5005 }
5006
5007 static struct rtnl_link_ops bond_link_ops __read_mostly = {
5008         .kind           = "bond",
5009         .priv_size      = sizeof(struct bonding),
5010         .setup          = bond_setup,
5011         .validate       = bond_validate,
5012 };
5013
5014 /* Create a new bond based on the specified name and bonding parameters.
5015  * If name is NULL, obtain a suitable "bond%d" name for us.
5016  * Caller must NOT hold rtnl_lock; we need to release it here before we
5017  * set up our sysfs entries.
5018  */
5019 int bond_create(struct net *net, const char *name)
5020 {
5021         struct net_device *bond_dev;
5022         int res;
5023
5024         rtnl_lock();
5025
5026         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
5027                                 bond_setup);
5028         if (!bond_dev) {
5029                 pr_err("%s: eek! can't alloc netdev!\n", name);
5030                 rtnl_unlock();
5031                 return -ENOMEM;
5032         }
5033
5034         dev_net_set(bond_dev, net);
5035         bond_dev->rtnl_link_ops = &bond_link_ops;
5036
5037         if (!name) {
5038                 res = dev_alloc_name(bond_dev, "bond%d");
5039                 if (res < 0)
5040                         goto out;
5041         }
5042
5043         res = register_netdevice(bond_dev);
5044
5045 out:
5046         rtnl_unlock();
5047         if (res < 0)
5048                 bond_destructor(bond_dev);
5049         return res;
5050 }
5051
5052 static int __net_init bond_net_init(struct net *net)
5053 {
5054         struct bond_net *bn = net_generic(net, bond_net_id);
5055
5056         bn->net = net;
5057         INIT_LIST_HEAD(&bn->dev_list);
5058
5059         bond_create_proc_dir(bn);
5060
5061         return 0;
5062 }
5063
5064 static void __net_exit bond_net_exit(struct net *net)
5065 {
5066         struct bond_net *bn = net_generic(net, bond_net_id);
5067
5068         bond_destroy_proc_dir(bn);
5069 }
5070
5071 static struct pernet_operations bond_net_ops = {
5072         .init = bond_net_init,
5073         .exit = bond_net_exit,
5074         .id   = &bond_net_id,
5075         .size = sizeof(struct bond_net),
5076 };
5077
5078 static int __init bonding_init(void)
5079 {
5080         int i;
5081         int res;
5082
5083         pr_info("%s", version);
5084
5085         res = bond_check_params(&bonding_defaults);
5086         if (res)
5087                 goto out;
5088
5089         res = register_pernet_subsys(&bond_net_ops);
5090         if (res)
5091                 goto out;
5092
5093         res = rtnl_link_register(&bond_link_ops);
5094         if (res)
5095                 goto err_link;
5096
5097         for (i = 0; i < max_bonds; i++) {
5098                 res = bond_create(&init_net, NULL);
5099                 if (res)
5100                         goto err;
5101         }
5102
5103         res = bond_create_sysfs();
5104         if (res)
5105                 goto err;
5106
5107         register_netdevice_notifier(&bond_netdev_notifier);
5108         register_inetaddr_notifier(&bond_inetaddr_notifier);
5109         bond_register_ipv6_notifier();
5110 out:
5111         return res;
5112 err:
5113         rtnl_link_unregister(&bond_link_ops);
5114 err_link:
5115         unregister_pernet_subsys(&bond_net_ops);
5116         goto out;
5117
5118 }
5119
5120 static void __exit bonding_exit(void)
5121 {
5122         unregister_netdevice_notifier(&bond_netdev_notifier);
5123         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5124         bond_unregister_ipv6_notifier();
5125
5126         bond_destroy_sysfs();
5127
5128         rtnl_link_unregister(&bond_link_ops);
5129         unregister_pernet_subsys(&bond_net_ops);
5130 }
5131
5132 module_init(bonding_init);
5133 module_exit(bonding_exit);
5134 MODULE_LICENSE("GPL");
5135 MODULE_VERSION(DRV_VERSION);
5136 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5137 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5138 MODULE_ALIAS_RTNL_LINK("bond");