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 tx_queues    = BOND_DEFAULT_TX_QUEUES;
  94 static int num_grat_arp = 1;
  95 static int num_unsol_na = 1;
  96 static int miimon       = BOND_LINK_MON_INTERV;
  97 static int updelay;
  98 static int downdelay;
  99 static int use_carrier  = 1;
 100 static char *mode;
 101 static char *primary;
 102 static char *primary_reselect;
 103 static char *lacp_rate;
 104 static char *ad_select;
 105 static char *xmit_hash_policy;
 106 static int arp_interval = BOND_LINK_ARP_INTERV;
 107 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 108 static char *arp_validate;
 109 static char *fail_over_mac;
 110 static int all_slaves_active = 0;
 111 static struct bond_params bonding_defaults;
 112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 113
 114 module_param(max_bonds, int, 0);
 115 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 116 module_param(tx_queues, int, 0);
 117 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 118 module_param(num_grat_arp, int, 0644);
 119 MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
 120 module_param(num_unsol_na, int, 0644);
 121 MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
 122 module_param(miimon, int, 0);
 123 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 124 module_param(updelay, int, 0);
 125 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 126 module_param(downdelay, int, 0);
 127 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 128                             "in milliseconds");
 129 module_param(use_carrier, int, 0);
 130 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 131                               "0 for off, 1 for on (default)");
 132 module_param(mode, charp, 0);
 133 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 134                        "1 for active-backup, 2 for balance-xor, "
 135                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 136                        "6 for balance-alb");
 137 module_param(primary, charp, 0);
 138 MODULE_PARM_DESC(primary, "Primary network device to use");
 139 module_param(primary_reselect, charp, 0);
 140 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 141                                    "once it comes up; "
 142                                    "0 for always (default), "
 143                                    "1 for only if speed of primary is "
 144                                    "better, "
 145                                    "2 for only on active slave "
 146                                    "failure");
 147 module_param(lacp_rate, charp, 0);
 148 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 149                             "(slow/fast)");
 150 module_param(ad_select, charp, 0);
 151 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
 152 module_param(xmit_hash_policy, charp, 0);
 153 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 154                                    ", 1 for layer 3+4");
 155 module_param(arp_interval, int, 0);
 156 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 157 module_param_array(arp_ip_target, charp, NULL, 0);
 158 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 159 module_param(arp_validate, charp, 0);
 160 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 161 module_param(fail_over_mac, charp, 0);
 162 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
 163 module_param(all_slaves_active, int, 0);
 164 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 165                                      "by setting active flag for all slaves.  "
 166                                      "0 for never (default), 1 for always.");
 167 module_param(resend_igmp, int, 0);
 168 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on link failure");
 169
 170 /*----------------------------- Global variables ----------------------------*/
 171
 172 static const char * const version =
 173         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 174
 175 int bond_net_id __read_mostly;
 176
 177 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 178 static int arp_ip_count;
 179 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 180 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 181 static int lacp_fast;
 182 #ifdef CONFIG_NET_POLL_CONTROLLER
 183 static int disable_netpoll = 1;
 184 #endif
 185
 186 const struct bond_parm_tbl bond_lacp_tbl[] = {
 187 {       "slow",         AD_LACP_SLOW},
 188 {       "fast",         AD_LACP_FAST},
 189 {       NULL,           -1},
 190 };
 191
 192 const struct bond_parm_tbl bond_mode_tbl[] = {
 193 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 194 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 195 {       "balance-xor",          BOND_MODE_XOR},
 196 {       "broadcast",            BOND_MODE_BROADCAST},
 197 {       "802.3ad",              BOND_MODE_8023AD},
 198 {       "balance-tlb",          BOND_MODE_TLB},
 199 {       "balance-alb",          BOND_MODE_ALB},
 200 {       NULL,                   -1},
 201 };
 202
 203 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 204 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 205 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 206 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 207 {       NULL,                   -1},
 208 };
 209
 210 const struct bond_parm_tbl arp_validate_tbl[] = {
 211 {       "none",                 BOND_ARP_VALIDATE_NONE},
 212 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 213 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 214 {       "all",                  BOND_ARP_VALIDATE_ALL},
 215 {       NULL,                   -1},
 216 };
 217
 218 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 219 {       "none",                 BOND_FOM_NONE},
 220 {       "active",               BOND_FOM_ACTIVE},
 221 {       "follow",               BOND_FOM_FOLLOW},
 222 {       NULL,                   -1},
 223 };
 224
 225 const struct bond_parm_tbl pri_reselect_tbl[] = {
 226 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 227 {       "better",               BOND_PRI_RESELECT_BETTER},
 228 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 229 {       NULL,                   -1},
 230 };
 231
 232 struct bond_parm_tbl ad_select_tbl[] = {
 233 {       "stable",       BOND_AD_STABLE},
 234 {       "bandwidth",    BOND_AD_BANDWIDTH},
 235 {       "count",        BOND_AD_COUNT},
 236 {       NULL,           -1},
 237 };
 238
 239 /*-------------------------- Forward declarations ---------------------------*/
 240
 241 static void bond_send_gratuitous_arp(struct bonding *bond);
 242 static int bond_init(struct net_device *bond_dev);
 243 static void bond_uninit(struct net_device *bond_dev);
 244
 245 /*---------------------------- General routines -----------------------------*/
 246
 247 static const char *bond_mode_name(int mode)
 248 {
 249         static const char *names[] = {
 250                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 251                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 252                 [BOND_MODE_XOR] = "load balancing (xor)",
 253                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 254                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 255                 [BOND_MODE_TLB] = "transmit load balancing",
 256                 [BOND_MODE_ALB] = "adaptive load balancing",
 257         };
 258
 259         if (mode < 0 || mode > BOND_MODE_ALB)
 260                 return "unknown";
 261
 262         return names[mode];
 263 }
 264
 265 /*---------------------------------- VLAN -----------------------------------*/
 266
 267 /**
 268  * bond_add_vlan - add a new vlan id on bond
 269  * @bond: bond that got the notification
 270  * @vlan_id: the vlan id to add
 271  *
 272  * Returns -ENOMEM if allocation failed.
 273  */
 274 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 275 {
 276         struct vlan_entry *vlan;
 277
 278         pr_debug("bond: %s, vlan id %d\n",
 279                  (bond ? bond->dev->name : "None"), vlan_id);
 280
 281         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 282         if (!vlan)
 283                 return -ENOMEM;
 284
 285         INIT_LIST_HEAD(&vlan->vlan_list);
 286         vlan->vlan_id = vlan_id;
 287
 288         write_lock_bh(&bond->lock);
 289
 290         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 291
 292         write_unlock_bh(&bond->lock);
 293
 294         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 295
 296         return 0;
 297 }
 298
 299 /**
 300  * bond_del_vlan - delete a vlan id from bond
 301  * @bond: bond that got the notification
 302  * @vlan_id: the vlan id to delete
 303  *
 304  * returns -ENODEV if @vlan_id was not found in @bond.
 305  */
 306 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 307 {
 308         struct vlan_entry *vlan;
 309         int res = -ENODEV;
 310
 311         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 312
 313         write_lock_bh(&bond->lock);
 314
 315         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 316                 if (vlan->vlan_id == vlan_id) {
 317                         list_del(&vlan->vlan_list);
 318
 319                         if (bond_is_lb(bond))
 320                                 bond_alb_clear_vlan(bond, vlan_id);
 321
 322                         pr_debug("removed VLAN ID %d from bond %s\n",
 323                                  vlan_id, bond->dev->name);
 324
 325                         kfree(vlan);
 326
 327                         if (list_empty(&bond->vlan_list) &&
 328                             (bond->slave_cnt == 0)) {
 329                                 /* Last VLAN removed and no slaves, so
 330                                  * restore block on adding VLANs. This will
 331                                  * be removed once new slaves that are not
 332                                  * VLAN challenged will be added.
 333                                  */
 334                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 335                         }
 336
 337                         res = 0;
 338                         goto out;
 339                 }
 340         }
 341
 342         pr_debug("couldn't find VLAN ID %d in bond %s\n",
 343                  vlan_id, bond->dev->name);
 344
 345 out:
 346         write_unlock_bh(&bond->lock);
 347         return res;
 348 }
 349
 350 /**
 351  * bond_has_challenged_slaves
 352  * @bond: the bond we're working on
 353  *
 354  * Searches the slave list. Returns 1 if a vlan challenged slave
 355  * was found, 0 otherwise.
 356  *
 357  * Assumes bond->lock is held.
 358  */
 359 static int bond_has_challenged_slaves(struct bonding *bond)
 360 {
 361         struct slave *slave;
 362         int i;
 363
 364         bond_for_each_slave(bond, slave, i) {
 365                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 366                         pr_debug("found VLAN challenged slave - %s\n",
 367                                  slave->dev->name);
 368                         return 1;
 369                 }
 370         }
 371
 372         pr_debug("no VLAN challenged slaves found\n");
 373         return 0;
 374 }
 375
 376 /**
 377  * bond_next_vlan - safely skip to the next item in the vlans list.
 378  * @bond: the bond we're working on
 379  * @curr: item we're advancing from
 380  *
 381  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 382  * or @curr->next otherwise (even if it is @curr itself again).
 383  *
 384  * Caller must hold bond->lock
 385  */
 386 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 387 {
 388         struct vlan_entry *next, *last;
 389
 390         if (list_empty(&bond->vlan_list))
 391                 return NULL;
 392
 393         if (!curr) {
 394                 next = list_entry(bond->vlan_list.next,
 395                                   struct vlan_entry, vlan_list);
 396         } else {
 397                 last = list_entry(bond->vlan_list.prev,
 398                                   struct vlan_entry, vlan_list);
 399                 if (last == curr) {
 400                         next = list_entry(bond->vlan_list.next,
 401                                           struct vlan_entry, vlan_list);
 402                 } else {
 403                         next = list_entry(curr->vlan_list.next,
 404                                           struct vlan_entry, vlan_list);
 405                 }
 406         }
 407
 408         return next;
 409 }
 410
 411 /**
 412  * bond_dev_queue_xmit - Prepare skb for xmit.
 413  *
 414  * @bond: bond device that got this skb for tx.
 415  * @skb: hw accel VLAN tagged skb to transmit
 416  * @slave_dev: slave that is supposed to xmit this skbuff
 417  *
 418  * When the bond gets an skb to transmit that is
 419  * already hardware accelerated VLAN tagged, and it
 420  * needs to relay this skb to a slave that is not
 421  * hw accel capable, the skb needs to be "unaccelerated",
 422  * i.e. strip the hwaccel tag and re-insert it as part
 423  * of the payload.
 424  */
 425 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 426                         struct net_device *slave_dev)
 427 {
 428         unsigned short uninitialized_var(vlan_id);
 429
 430         /* Test vlan_list not vlgrp to catch and handle 802.1p tags */
 431         if (!list_empty(&bond->vlan_list) &&
 432             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 433             vlan_get_tag(skb, &vlan_id) == 0) {
 434                 skb->dev = slave_dev;
 435                 skb = vlan_put_tag(skb, vlan_id);
 436                 if (!skb) {
 437                         /* vlan_put_tag() frees the skb in case of error,
 438                          * so return success here so the calling functions
 439                          * won't attempt to free is again.
 440                          */
 441                         return 0;
 442                 }
 443         } else {
 444                 skb->dev = slave_dev;
 445         }
 446
 447         skb->priority = 1;
 448 #ifdef CONFIG_NET_POLL_CONTROLLER
 449         if (unlikely(bond->dev->priv_flags & IFF_IN_NETPOLL)) {
 450                 struct netpoll *np = bond->dev->npinfo->netpoll;
 451                 slave_dev->npinfo = bond->dev->npinfo;
 452                 np->real_dev = np->dev = skb->dev;
 453                 slave_dev->priv_flags |= IFF_IN_NETPOLL;
 454                 netpoll_send_skb(np, skb);
 455                 slave_dev->priv_flags &= ~IFF_IN_NETPOLL;
 456                 np->dev = bond->dev;
 457         } else
 458 #endif
 459                 dev_queue_xmit(skb);
 460
 461         return 0;
 462 }
 463
 464 /*
 465  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 466  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 467  * lock because:
 468  * a. This operation is performed in IOCTL context,
 469  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 470  * c. Holding a lock with BH disabled while directly calling a base driver
 471  *    entry point is generally a BAD idea.
 472  *
 473  * The design of synchronization/protection for this operation in the 8021q
 474  * module is good for one or more VLAN devices over a single physical device
 475  * and cannot be extended for a teaming solution like bonding, so there is a
 476  * potential race condition here where a net device from the vlan group might
 477  * be referenced (either by a base driver or the 8021q code) while it is being
 478  * removed from the system. However, it turns out we're not making matters
 479  * worse, and if it works for regular VLAN usage it will work here too.
 480 */
 481
 482 /**
 483  * bond_vlan_rx_register - Propagates registration to slaves
 484  * @bond_dev: bonding net device that got called
 485  * @grp: vlan group being registered
 486  */
 487 static void bond_vlan_rx_register(struct net_device *bond_dev,
 488                                   struct vlan_group *grp)
 489 {
 490         struct bonding *bond = netdev_priv(bond_dev);
 491         struct slave *slave;
 492         int i;
 493
 494         write_lock(&bond->lock);
 495         bond->vlgrp = grp;
 496         write_unlock(&bond->lock);
 497
 498         bond_for_each_slave(bond, slave, i) {
 499                 struct net_device *slave_dev = slave->dev;
 500                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 501
 502                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 503                     slave_ops->ndo_vlan_rx_register) {
 504                         slave_ops->ndo_vlan_rx_register(slave_dev, grp);
 505                 }
 506         }
 507 }
 508
 509 /**
 510  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 511  * @bond_dev: bonding net device that got called
 512  * @vid: vlan id being added
 513  */
 514 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 515 {
 516         struct bonding *bond = netdev_priv(bond_dev);
 517         struct slave *slave;
 518         int i, res;
 519
 520         bond_for_each_slave(bond, slave, i) {
 521                 struct net_device *slave_dev = slave->dev;
 522                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 523
 524                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 525                     slave_ops->ndo_vlan_rx_add_vid) {
 526                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
 527                 }
 528         }
 529
 530         res = bond_add_vlan(bond, vid);
 531         if (res) {
 532                 pr_err("%s: Error: Failed to add vlan id %d\n",
 533                        bond_dev->name, vid);
 534         }
 535 }
 536
 537 /**
 538  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 539  * @bond_dev: bonding net device that got called
 540  * @vid: vlan id being removed
 541  */
 542 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 543 {
 544         struct bonding *bond = netdev_priv(bond_dev);
 545         struct slave *slave;
 546         struct net_device *vlan_dev;
 547         int i, res;
 548
 549         bond_for_each_slave(bond, slave, i) {
 550                 struct net_device *slave_dev = slave->dev;
 551                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 552
 553                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 554                     slave_ops->ndo_vlan_rx_kill_vid) {
 555                         /* Save and then restore vlan_dev in the grp array,
 556                          * since the slave's driver might clear it.
 557                          */
 558                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
 559                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
 560                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
 561                 }
 562         }
 563
 564         res = bond_del_vlan(bond, vid);
 565         if (res) {
 566                 pr_err("%s: Error: Failed to remove vlan id %d\n",
 567                        bond_dev->name, vid);
 568         }
 569 }
 570
 571 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 572 {
 573         struct vlan_entry *vlan;
 574         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 575
 576         if (!bond->vlgrp)
 577                 return;
 578
 579         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 580             slave_ops->ndo_vlan_rx_register)
 581                 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
 582
 583         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 584             !(slave_ops->ndo_vlan_rx_add_vid))
 585                 return;
 586
 587         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
 588                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 589 }
 590
 591 static void bond_del_vlans_from_slave(struct bonding *bond,
 592                                       struct net_device *slave_dev)
 593 {
 594         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 595         struct vlan_entry *vlan;
 596         struct net_device *vlan_dev;
 597
 598         if (!bond->vlgrp)
 599                 return;
 600
 601         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 602             !(slave_ops->ndo_vlan_rx_kill_vid))
 603                 goto unreg;
 604
 605         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 606                 if (!vlan->vlan_id)
 607                         continue;
 608                 /* Save and then restore vlan_dev in the grp array,
 609                  * since the slave's driver might clear it.
 610                  */
 611                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
 612                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 613                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
 614         }
 615
 616 unreg:
 617         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 618             slave_ops->ndo_vlan_rx_register)
 619                 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
 620 }
 621
 622 /*------------------------------- Link status -------------------------------*/
 623
 624 /*
 625  * Set the carrier state for the master according to the state of its
 626  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 627  * do special 802.3ad magic.
 628  *
 629  * Returns zero if carrier state does not change, nonzero if it does.
 630  */
 631 static int bond_set_carrier(struct bonding *bond)
 632 {
 633         struct slave *slave;
 634         int i;
 635
 636         if (bond->slave_cnt == 0)
 637                 goto down;
 638
 639         if (bond->params.mode == BOND_MODE_8023AD)
 640                 return bond_3ad_set_carrier(bond);
 641
 642         bond_for_each_slave(bond, slave, i) {
 643                 if (slave->link == BOND_LINK_UP) {
 644                         if (!netif_carrier_ok(bond->dev)) {
 645                                 netif_carrier_on(bond->dev);
 646                                 return 1;
 647                         }
 648                         return 0;
 649                 }
 650         }
 651
 652 down:
 653         if (netif_carrier_ok(bond->dev)) {
 654                 netif_carrier_off(bond->dev);
 655                 return 1;
 656         }
 657         return 0;
 658 }
 659
 660 /*
 661  * Get link speed and duplex from the slave's base driver
 662  * using ethtool. If for some reason the call fails or the
 663  * values are invalid, fake speed and duplex to 100/Full
 664  * and return error.
 665  */
 666 static int bond_update_speed_duplex(struct slave *slave)
 667 {
 668         struct net_device *slave_dev = slave->dev;
 669         struct ethtool_cmd etool;
 670         int res;
 671
 672         /* Fake speed and duplex */
 673         slave->speed = SPEED_100;
 674         slave->duplex = DUPLEX_FULL;
 675
 676         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
 677                 return -1;
 678
 679         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 680         if (res < 0)
 681                 return -1;
 682
 683         switch (etool.speed) {
 684         case SPEED_10:
 685         case SPEED_100:
 686         case SPEED_1000:
 687         case SPEED_10000:
 688                 break;
 689         default:
 690                 return -1;
 691         }
 692
 693         switch (etool.duplex) {
 694         case DUPLEX_FULL:
 695         case DUPLEX_HALF:
 696                 break;
 697         default:
 698                 return -1;
 699         }
 700
 701         slave->speed = etool.speed;
 702         slave->duplex = etool.duplex;
 703
 704         return 0;
 705 }
 706
 707 /*
 708  * if <dev> supports MII link status reporting, check its link status.
 709  *
 710  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 711  * depending upon the setting of the use_carrier parameter.
 712  *
 713  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 714  * can't tell and just pretend it is), or 0, meaning that the link is
 715  * down.
 716  *
 717  * If reporting is non-zero, instead of faking link up, return -1 if
 718  * both ETHTOOL and MII ioctls fail (meaning the device does not
 719  * support them).  If use_carrier is set, return whatever it says.
 720  * It'd be nice if there was a good way to tell if a driver supports
 721  * netif_carrier, but there really isn't.
 722  */
 723 static int bond_check_dev_link(struct bonding *bond,
 724                                struct net_device *slave_dev, int reporting)
 725 {
 726         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 727         int (*ioctl)(struct net_device *, struct ifreq *, int);
 728         struct ifreq ifr;
 729         struct mii_ioctl_data *mii;
 730
 731         if (!reporting && !netif_running(slave_dev))
 732                 return 0;
 733
 734         if (bond->params.use_carrier)
 735                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 736
 737         /* Try to get link status using Ethtool first. */
 738         if (slave_dev->ethtool_ops) {
 739                 if (slave_dev->ethtool_ops->get_link) {
 740                         u32 link;
 741
 742                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 743
 744                         return link ? BMSR_LSTATUS : 0;
 745                 }
 746         }
 747
 748         /* Ethtool can't be used, fallback to MII ioctls. */
 749         ioctl = slave_ops->ndo_do_ioctl;
 750         if (ioctl) {
 751                 /* TODO: set pointer to correct ioctl on a per team member */
 752                 /*       bases to make this more efficient. that is, once  */
 753                 /*       we determine the correct ioctl, we will always    */
 754                 /*       call it and not the others for that team          */
 755                 /*       member.                                           */
 756
 757                 /*
 758                  * We cannot assume that SIOCGMIIPHY will also read a
 759                  * register; not all network drivers (e.g., e100)
 760                  * support that.
 761                  */
 762
 763                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 764                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 765                 mii = if_mii(&ifr);
 766                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 767                         mii->reg_num = MII_BMSR;
 768                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 769                                 return mii->val_out & BMSR_LSTATUS;
 770                 }
 771         }
 772
 773         /*
 774          * If reporting, report that either there's no dev->do_ioctl,
 775          * or both SIOCGMIIREG and get_link failed (meaning that we
 776          * cannot report link status).  If not reporting, pretend
 777          * we're ok.
 778          */
 779         return reporting ? -1 : BMSR_LSTATUS;
 780 }
 781
 782 /*----------------------------- Multicast list ------------------------------*/
 783
 784 /*
 785  * Push the promiscuity flag down to appropriate slaves
 786  */
 787 static int bond_set_promiscuity(struct bonding *bond, int inc)
 788 {
 789         int err = 0;
 790         if (USES_PRIMARY(bond->params.mode)) {
 791                 /* write lock already acquired */
 792                 if (bond->curr_active_slave) {
 793                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 794                                                   inc);
 795                 }
 796         } else {
 797                 struct slave *slave;
 798                 int i;
 799                 bond_for_each_slave(bond, slave, i) {
 800                         err = dev_set_promiscuity(slave->dev, inc);
 801                         if (err)
 802                                 return err;
 803                 }
 804         }
 805         return err;
 806 }
 807
 808 /*
 809  * Push the allmulti flag down to all slaves
 810  */
 811 static int bond_set_allmulti(struct bonding *bond, int inc)
 812 {
 813         int err = 0;
 814         if (USES_PRIMARY(bond->params.mode)) {
 815                 /* write lock already acquired */
 816                 if (bond->curr_active_slave) {
 817                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 818                                                inc);
 819                 }
 820         } else {
 821                 struct slave *slave;
 822                 int i;
 823                 bond_for_each_slave(bond, slave, i) {
 824                         err = dev_set_allmulti(slave->dev, inc);
 825                         if (err)
 826                                 return err;
 827                 }
 828         }
 829         return err;
 830 }
 831
 832 /*
 833  * Add a Multicast address to slaves
 834  * according to mode
 835  */
 836 static void bond_mc_add(struct bonding *bond, void *addr)
 837 {
 838         if (USES_PRIMARY(bond->params.mode)) {
 839                 /* write lock already acquired */
 840                 if (bond->curr_active_slave)
 841                         dev_mc_add(bond->curr_active_slave->dev, addr);
 842         } else {
 843                 struct slave *slave;
 844                 int i;
 845
 846                 bond_for_each_slave(bond, slave, i)
 847                         dev_mc_add(slave->dev, addr);
 848         }
 849 }
 850
 851 /*
 852  * Remove a multicast address from slave
 853  * according to mode
 854  */
 855 static void bond_mc_del(struct bonding *bond, void *addr)
 856 {
 857         if (USES_PRIMARY(bond->params.mode)) {
 858                 /* write lock already acquired */
 859                 if (bond->curr_active_slave)
 860                         dev_mc_del(bond->curr_active_slave->dev, addr);
 861         } else {
 862                 struct slave *slave;
 863                 int i;
 864                 bond_for_each_slave(bond, slave, i) {
 865                         dev_mc_del(slave->dev, addr);
 866                 }
 867         }
 868 }
 869
 870
 871 static void __bond_resend_igmp_join_requests(struct net_device *dev)
 872 {
 873         struct in_device *in_dev;
 874         struct ip_mc_list *im;
 875
 876         rcu_read_lock();
 877         in_dev = __in_dev_get_rcu(dev);
 878         if (in_dev) {
 879                 for (im = in_dev->mc_list; im; im = im->next)
 880                         ip_mc_rejoin_group(im);
 881         }
 882
 883         rcu_read_unlock();
 884 }
 885
 886 /*
 887  * Retrieve the list of registered multicast addresses for the bonding
 888  * device and retransmit an IGMP JOIN request to the current active
 889  * slave.
 890  */
 891 static void bond_resend_igmp_join_requests(struct bonding *bond)
 892 {
 893         struct net_device *vlan_dev;
 894         struct vlan_entry *vlan;
 895
 896         read_lock(&bond->lock);
 897
 898         /* rejoin all groups on bond device */
 899         __bond_resend_igmp_join_requests(bond->dev);
 900
 901         /* rejoin all groups on vlan devices */
 902         if (bond->vlgrp) {
 903                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 904                         vlan_dev = vlan_group_get_device(bond->vlgrp,
 905                                                          vlan->vlan_id);
 906                         if (vlan_dev)
 907                                 __bond_resend_igmp_join_requests(vlan_dev);
 908                 }
 909         }
 910
 911         if (--bond->igmp_retrans > 0)
 912                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 913
 914         read_unlock(&bond->lock);
 915 }
 916
 917 void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 918 {
 919         struct bonding *bond = container_of(work, struct bonding,
 920                                                         mcast_work.work);
 921         bond_resend_igmp_join_requests(bond);
 922 }
 923
 924 /*
 925  * flush all members of flush->mc_list from device dev->mc_list
 926  */
 927 static void bond_mc_list_flush(struct net_device *bond_dev,
 928                                struct net_device *slave_dev)
 929 {
 930         struct bonding *bond = netdev_priv(bond_dev);
 931         struct netdev_hw_addr *ha;
 932
 933         netdev_for_each_mc_addr(ha, bond_dev)
 934                 dev_mc_del(slave_dev, ha->addr);
 935
 936         if (bond->params.mode == BOND_MODE_8023AD) {
 937                 /* del lacpdu mc addr from mc list */
 938                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 939
 940                 dev_mc_del(slave_dev, lacpdu_multicast);
 941         }
 942 }
 943
 944 /*--------------------------- Active slave change ---------------------------*/
 945
 946 /*
 947  * Update the mc list and multicast-related flags for the new and
 948  * old active slaves (if any) according to the multicast mode, and
 949  * promiscuous flags unconditionally.
 950  */
 951 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
 952                          struct slave *old_active)
 953 {
 954         struct netdev_hw_addr *ha;
 955
 956         if (!USES_PRIMARY(bond->params.mode))
 957                 /* nothing to do -  mc list is already up-to-date on
 958                  * all slaves
 959                  */
 960                 return;
 961
 962         if (old_active) {
 963                 if (bond->dev->flags & IFF_PROMISC)
 964                         dev_set_promiscuity(old_active->dev, -1);
 965
 966                 if (bond->dev->flags & IFF_ALLMULTI)
 967                         dev_set_allmulti(old_active->dev, -1);
 968
 969                 netdev_for_each_mc_addr(ha, bond->dev)
 970                         dev_mc_del(old_active->dev, ha->addr);
 971         }
 972
 973         if (new_active) {
 974                 /* FIXME: Signal errors upstream. */
 975                 if (bond->dev->flags & IFF_PROMISC)
 976                         dev_set_promiscuity(new_active->dev, 1);
 977
 978                 if (bond->dev->flags & IFF_ALLMULTI)
 979                         dev_set_allmulti(new_active->dev, 1);
 980
 981                 netdev_for_each_mc_addr(ha, bond->dev)
 982                         dev_mc_add(new_active->dev, ha->addr);
 983         }
 984 }
 985
 986 /*
 987  * bond_do_fail_over_mac
 988  *
 989  * Perform special MAC address swapping for fail_over_mac settings
 990  *
 991  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 992  */
 993 static void bond_do_fail_over_mac(struct bonding *bond,
 994                                   struct slave *new_active,
 995                                   struct slave *old_active)
 996         __releases(&bond->curr_slave_lock)
 997         __releases(&bond->lock)
 998         __acquires(&bond->lock)
 999         __acquires(&bond->curr_slave_lock)
1000 {
1001         u8 tmp_mac[ETH_ALEN];
1002         struct sockaddr saddr;
1003         int rv;
1004
1005         switch (bond->params.fail_over_mac) {
1006         case BOND_FOM_ACTIVE:
1007                 if (new_active)
1008                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
1009                                new_active->dev->addr_len);
1010                 break;
1011         case BOND_FOM_FOLLOW:
1012                 /*
1013                  * if new_active && old_active, swap them
1014                  * if just old_active, do nothing (going to no active slave)
1015                  * if just new_active, set new_active to bond's MAC
1016                  */
1017                 if (!new_active)
1018                         return;
1019
1020                 write_unlock_bh(&bond->curr_slave_lock);
1021                 read_unlock(&bond->lock);
1022
1023                 if (old_active) {
1024                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1025                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
1026                                ETH_ALEN);
1027                         saddr.sa_family = new_active->dev->type;
1028                 } else {
1029                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1030                         saddr.sa_family = bond->dev->type;
1031                 }
1032
1033                 rv = dev_set_mac_address(new_active->dev, &saddr);
1034                 if (rv) {
1035                         pr_err("%s: Error %d setting MAC of slave %s\n",
1036                                bond->dev->name, -rv, new_active->dev->name);
1037                         goto out;
1038                 }
1039
1040                 if (!old_active)
1041                         goto out;
1042
1043                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1044                 saddr.sa_family = old_active->dev->type;
1045
1046                 rv = dev_set_mac_address(old_active->dev, &saddr);
1047                 if (rv)
1048                         pr_err("%s: Error %d setting MAC of slave %s\n",
1049                                bond->dev->name, -rv, new_active->dev->name);
1050 out:
1051                 read_lock(&bond->lock);
1052                 write_lock_bh(&bond->curr_slave_lock);
1053                 break;
1054         default:
1055                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
1056                        bond->dev->name, bond->params.fail_over_mac);
1057                 break;
1058         }
1059
1060 }
1061
1062 static bool bond_should_change_active(struct bonding *bond)
1063 {
1064         struct slave *prim = bond->primary_slave;
1065         struct slave *curr = bond->curr_active_slave;
1066
1067         if (!prim || !curr || curr->link != BOND_LINK_UP)
1068                 return true;
1069         if (bond->force_primary) {
1070                 bond->force_primary = false;
1071                 return true;
1072         }
1073         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
1074             (prim->speed < curr->speed ||
1075              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
1076                 return false;
1077         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
1078                 return false;
1079         return true;
1080 }
1081
1082 /**
1083  * find_best_interface - select the best available slave to be the active one
1084  * @bond: our bonding struct
1085  *
1086  * Warning: Caller must hold curr_slave_lock for writing.
1087  */
1088 static struct slave *bond_find_best_slave(struct bonding *bond)
1089 {
1090         struct slave *new_active, *old_active;
1091         struct slave *bestslave = NULL;
1092         int mintime = bond->params.updelay;
1093         int i;
1094
1095         new_active = bond->curr_active_slave;
1096
1097         if (!new_active) { /* there were no active slaves left */
1098                 if (bond->slave_cnt > 0)   /* found one slave */
1099                         new_active = bond->first_slave;
1100                 else
1101                         return NULL; /* still no slave, return NULL */
1102         }
1103
1104         if ((bond->primary_slave) &&
1105             bond->primary_slave->link == BOND_LINK_UP &&
1106             bond_should_change_active(bond)) {
1107                 new_active = bond->primary_slave;
1108         }
1109
1110         /* remember where to stop iterating over the slaves */
1111         old_active = new_active;
1112
1113         bond_for_each_slave_from(bond, new_active, i, old_active) {
1114                 if (new_active->link == BOND_LINK_UP) {
1115                         return new_active;
1116                 } else if (new_active->link == BOND_LINK_BACK &&
1117                            IS_UP(new_active->dev)) {
1118                         /* link up, but waiting for stabilization */
1119                         if (new_active->delay < mintime) {
1120                                 mintime = new_active->delay;
1121                                 bestslave = new_active;
1122                         }
1123                 }
1124         }
1125
1126         return bestslave;
1127 }
1128
1129 /**
1130  * change_active_interface - change the active slave into the specified one
1131  * @bond: our bonding struct
1132  * @new: the new slave to make the active one
1133  *
1134  * Set the new slave to the bond's settings and unset them on the old
1135  * curr_active_slave.
1136  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1137  *
1138  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1139  * because it is apparently the best available slave we have, even though its
1140  * updelay hasn't timed out yet.
1141  *
1142  * If new_active is not NULL, caller must hold bond->lock for read and
1143  * curr_slave_lock for write_bh.
1144  */
1145 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1146 {
1147         struct slave *old_active = bond->curr_active_slave;
1148
1149         if (old_active == new_active)
1150                 return;
1151
1152         if (new_active) {
1153                 new_active->jiffies = jiffies;
1154
1155                 if (new_active->link == BOND_LINK_BACK) {
1156                         if (USES_PRIMARY(bond->params.mode)) {
1157                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1158                                         bond->dev->name, new_active->dev->name,
1159                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1160                         }
1161
1162                         new_active->delay = 0;
1163                         new_active->link = BOND_LINK_UP;
1164
1165                         if (bond->params.mode == BOND_MODE_8023AD)
1166                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1167
1168                         if (bond_is_lb(bond))
1169                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1170                 } else {
1171                         if (USES_PRIMARY(bond->params.mode)) {
1172                                 pr_info("%s: making interface %s the new active one.\n",
1173                                         bond->dev->name, new_active->dev->name);
1174                         }
1175                 }
1176         }
1177
1178         if (USES_PRIMARY(bond->params.mode))
1179                 bond_mc_swap(bond, new_active, old_active);
1180
1181         if (bond_is_lb(bond)) {
1182                 bond_alb_handle_active_change(bond, new_active);
1183                 if (old_active)
1184                         bond_set_slave_inactive_flags(old_active);
1185                 if (new_active)
1186                         bond_set_slave_active_flags(new_active);
1187         } else {
1188                 bond->curr_active_slave = new_active;
1189         }
1190
1191         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1192                 if (old_active)
1193                         bond_set_slave_inactive_flags(old_active);
1194
1195                 if (new_active) {
1196                         bond_set_slave_active_flags(new_active);
1197
1198                         if (bond->params.fail_over_mac)
1199                                 bond_do_fail_over_mac(bond, new_active,
1200                                                       old_active);
1201
1202                         bond->send_grat_arp = bond->params.num_grat_arp;
1203                         bond_send_gratuitous_arp(bond);
1204
1205                         bond->send_unsol_na = bond->params.num_unsol_na;
1206                         bond_send_unsolicited_na(bond);
1207
1208                         write_unlock_bh(&bond->curr_slave_lock);
1209                         read_unlock(&bond->lock);
1210
1211                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1212
1213                         read_lock(&bond->lock);
1214                         write_lock_bh(&bond->curr_slave_lock);
1215                 }
1216         }
1217
1218         /* resend IGMP joins since active slave has changed or
1219          * all were sent on curr_active_slave */
1220         if ((USES_PRIMARY(bond->params.mode) && new_active) ||
1221             bond->params.mode == BOND_MODE_ROUNDROBIN) {
1222                 bond->igmp_retrans = bond->params.resend_igmp;
1223                 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1224         }
1225 }
1226
1227 /**
1228  * bond_select_active_slave - select a new active slave, if needed
1229  * @bond: our bonding struct
1230  *
1231  * This functions should be called when one of the following occurs:
1232  * - The old curr_active_slave has been released or lost its link.
1233  * - The primary_slave has got its link back.
1234  * - A slave has got its link back and there's no old curr_active_slave.
1235  *
1236  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1237  */
1238 void bond_select_active_slave(struct bonding *bond)
1239 {
1240         struct slave *best_slave;
1241         int rv;
1242
1243         best_slave = bond_find_best_slave(bond);
1244         if (best_slave != bond->curr_active_slave) {
1245                 bond_change_active_slave(bond, best_slave);
1246                 rv = bond_set_carrier(bond);
1247                 if (!rv)
1248                         return;
1249
1250                 if (netif_carrier_ok(bond->dev)) {
1251                         pr_info("%s: first active interface up!\n",
1252                                 bond->dev->name);
1253                 } else {
1254                         pr_info("%s: now running without any active interface !\n",
1255                                 bond->dev->name);
1256                 }
1257         }
1258 }
1259
1260 /*--------------------------- slave list handling ---------------------------*/
1261
1262 /*
1263  * This function attaches the slave to the end of list.
1264  *
1265  * bond->lock held for writing by caller.
1266  */
1267 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1268 {
1269         if (bond->first_slave == NULL) { /* attaching the first slave */
1270                 new_slave->next = new_slave;
1271                 new_slave->prev = new_slave;
1272                 bond->first_slave = new_slave;
1273         } else {
1274                 new_slave->next = bond->first_slave;
1275                 new_slave->prev = bond->first_slave->prev;
1276                 new_slave->next->prev = new_slave;
1277                 new_slave->prev->next = new_slave;
1278         }
1279
1280         bond->slave_cnt++;
1281 }
1282
1283 /*
1284  * This function detaches the slave from the list.
1285  * WARNING: no check is made to verify if the slave effectively
1286  * belongs to <bond>.
1287  * Nothing is freed on return, structures are just unchained.
1288  * If any slave pointer in bond was pointing to <slave>,
1289  * it should be changed by the calling function.
1290  *
1291  * bond->lock held for writing by caller.
1292  */
1293 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1294 {
1295         if (slave->next)
1296                 slave->next->prev = slave->prev;
1297
1298         if (slave->prev)
1299                 slave->prev->next = slave->next;
1300
1301         if (bond->first_slave == slave) { /* slave is the first slave */
1302                 if (bond->slave_cnt > 1) { /* there are more slave */
1303                         bond->first_slave = slave->next;
1304                 } else {
1305                         bond->first_slave = NULL; /* slave was the last one */
1306                 }
1307         }
1308
1309         slave->next = NULL;
1310         slave->prev = NULL;
1311         bond->slave_cnt--;
1312 }
1313
1314 #ifdef CONFIG_NET_POLL_CONTROLLER
1315 /*
1316  * You must hold read lock on bond->lock before calling this.
1317  */
1318 static bool slaves_support_netpoll(struct net_device *bond_dev)
1319 {
1320         struct bonding *bond = netdev_priv(bond_dev);
1321         struct slave *slave;
1322         int i = 0;
1323         bool ret = true;
1324
1325         bond_for_each_slave(bond, slave, i) {
1326                 if ((slave->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
1327                     !slave->dev->netdev_ops->ndo_poll_controller)
1328                         ret = false;
1329         }
1330         return i != 0 && ret;
1331 }
1332
1333 static void bond_poll_controller(struct net_device *bond_dev)
1334 {
1335         struct net_device *dev = bond_dev->npinfo->netpoll->real_dev;
1336         if (dev != bond_dev)
1337                 netpoll_poll_dev(dev);
1338 }
1339
1340 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1341 {
1342         struct bonding *bond = netdev_priv(bond_dev);
1343         struct slave *slave;
1344         const struct net_device_ops *ops;
1345         int i;
1346
1347         read_lock(&bond->lock);
1348         bond_dev->npinfo = NULL;
1349         bond_for_each_slave(bond, slave, i) {
1350                 if (slave->dev) {
1351                         ops = slave->dev->netdev_ops;
1352                         if (ops->ndo_netpoll_cleanup)
1353                                 ops->ndo_netpoll_cleanup(slave->dev);
1354                         else
1355                                 slave->dev->npinfo = NULL;
1356                 }
1357         }
1358         read_unlock(&bond->lock);
1359 }
1360
1361 #else
1362
1363 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1364 {
1365 }
1366
1367 #endif
1368
1369 /*---------------------------------- IOCTL ----------------------------------*/
1370
1371 static int bond_sethwaddr(struct net_device *bond_dev,
1372                           struct net_device *slave_dev)
1373 {
1374         pr_debug("bond_dev=%p\n", bond_dev);
1375         pr_debug("slave_dev=%p\n", slave_dev);
1376         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1377         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1378         return 0;
1379 }
1380
1381 #define BOND_VLAN_FEATURES \
1382         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1383          NETIF_F_HW_VLAN_FILTER)
1384
1385 /*
1386  * Compute the common dev->feature set available to all slaves.  Some
1387  * feature bits are managed elsewhere, so preserve those feature bits
1388  * on the master device.
1389  */
1390 static int bond_compute_features(struct bonding *bond)
1391 {
1392         struct slave *slave;
1393         struct net_device *bond_dev = bond->dev;
1394         unsigned long features = bond_dev->features;
1395         unsigned long vlan_features = 0;
1396         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1397                                                 bond_dev->hard_header_len);
1398         int i;
1399
1400         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1401         features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1402
1403         if (!bond->first_slave)
1404                 goto done;
1405
1406         features &= ~NETIF_F_ONE_FOR_ALL;
1407
1408         vlan_features = bond->first_slave->dev->vlan_features;
1409         bond_for_each_slave(bond, slave, i) {
1410                 features = netdev_increment_features(features,
1411                                                      slave->dev->features,
1412                                                      NETIF_F_ONE_FOR_ALL);
1413                 vlan_features = netdev_increment_features(vlan_features,
1414                                                         slave->dev->vlan_features,
1415                                                         NETIF_F_ONE_FOR_ALL);
1416                 if (slave->dev->hard_header_len > max_hard_header_len)
1417                         max_hard_header_len = slave->dev->hard_header_len;
1418         }
1419
1420 done:
1421         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1422         bond_dev->features = netdev_fix_features(features, NULL);
1423         bond_dev->vlan_features = netdev_fix_features(vlan_features, NULL);
1424         bond_dev->hard_header_len = max_hard_header_len;
1425
1426         return 0;
1427 }
1428
1429 static void bond_setup_by_slave(struct net_device *bond_dev,
1430                                 struct net_device *slave_dev)
1431 {
1432         struct bonding *bond = netdev_priv(bond_dev);
1433
1434         bond_dev->header_ops        = slave_dev->header_ops;
1435
1436         bond_dev->type              = slave_dev->type;
1437         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1438         bond_dev->addr_len          = slave_dev->addr_len;
1439
1440         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1441                 slave_dev->addr_len);
1442         bond->setup_by_slave = 1;
1443 }
1444
1445 /* enslave device <slave> to bond device <master> */
1446 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1447 {
1448         struct bonding *bond = netdev_priv(bond_dev);
1449         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1450         struct slave *new_slave = NULL;
1451         struct netdev_hw_addr *ha;
1452         struct sockaddr addr;
1453         int link_reporting;
1454         int old_features = bond_dev->features;
1455         int res = 0;
1456
1457         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1458                 slave_ops->ndo_do_ioctl == NULL) {
1459                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1460                            bond_dev->name, slave_dev->name);
1461         }
1462
1463         /* bond must be initialized by bond_open() before enslaving */
1464         if (!(bond_dev->flags & IFF_UP)) {
1465                 pr_warning("%s: master_dev is not up in bond_enslave\n",
1466                            bond_dev->name);
1467         }
1468
1469         /* already enslaved */
1470         if (slave_dev->flags & IFF_SLAVE) {
1471                 pr_debug("Error, Device was already enslaved\n");
1472                 return -EBUSY;
1473         }
1474
1475         /* vlan challenged mutual exclusion */
1476         /* no need to lock since we're protected by rtnl_lock */
1477         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1478                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1479                 if (bond->vlgrp) {
1480                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1481                                bond_dev->name, slave_dev->name, bond_dev->name);
1482                         return -EPERM;
1483                 } else {
1484                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1485                                    bond_dev->name, slave_dev->name,
1486                                    slave_dev->name, bond_dev->name);
1487                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1488                 }
1489         } else {
1490                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1491                 if (bond->slave_cnt == 0) {
1492                         /* First slave, and it is not VLAN challenged,
1493                          * so remove the block of adding VLANs over the bond.
1494                          */
1495                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1496                 }
1497         }
1498
1499         /*
1500          * Old ifenslave binaries are no longer supported.  These can
1501          * be identified with moderate accuracy by the state of the slave:
1502          * the current ifenslave will set the interface down prior to
1503          * enslaving it; the old ifenslave will not.
1504          */
1505         if ((slave_dev->flags & IFF_UP)) {
1506                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1507                        slave_dev->name);
1508                 res = -EPERM;
1509                 goto err_undo_flags;
1510         }
1511
1512         /* set bonding device ether type by slave - bonding netdevices are
1513          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1514          * there is a need to override some of the type dependent attribs/funcs.
1515          *
1516          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1517          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1518          */
1519         if (bond->slave_cnt == 0) {
1520                 if (bond_dev->type != slave_dev->type) {
1521                         pr_debug("%s: change device type from %d to %d\n",
1522                                  bond_dev->name,
1523                                  bond_dev->type, slave_dev->type);
1524
1525                         res = netdev_bonding_change(bond_dev,
1526                                                     NETDEV_PRE_TYPE_CHANGE);
1527                         res = notifier_to_errno(res);
1528                         if (res) {
1529                                 pr_err("%s: refused to change device type\n",
1530                                        bond_dev->name);
1531                                 res = -EBUSY;
1532                                 goto err_undo_flags;
1533                         }
1534
1535                         /* Flush unicast and multicast addresses */
1536                         dev_uc_flush(bond_dev);
1537                         dev_mc_flush(bond_dev);
1538
1539                         if (slave_dev->type != ARPHRD_ETHER)
1540                                 bond_setup_by_slave(bond_dev, slave_dev);
1541                         else
1542                                 ether_setup(bond_dev);
1543
1544                         netdev_bonding_change(bond_dev,
1545                                               NETDEV_POST_TYPE_CHANGE);
1546                 }
1547         } else if (bond_dev->type != slave_dev->type) {
1548                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1549                        slave_dev->name,
1550                        slave_dev->type, bond_dev->type);
1551                 res = -EINVAL;
1552                 goto err_undo_flags;
1553         }
1554
1555         if (slave_ops->ndo_set_mac_address == NULL) {
1556                 if (bond->slave_cnt == 0) {
1557                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1558                                    bond_dev->name);
1559                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1560                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1561                         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",
1562                                bond_dev->name);
1563                         res = -EOPNOTSUPP;
1564                         goto err_undo_flags;
1565                 }
1566         }
1567
1568         /* If this is the first slave, then we need to set the master's hardware
1569          * address to be the same as the slave's. */
1570         if (bond->slave_cnt == 0)
1571                 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1572                        slave_dev->addr_len);
1573
1574
1575         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1576         if (!new_slave) {
1577                 res = -ENOMEM;
1578                 goto err_undo_flags;
1579         }
1580
1581         /*
1582          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1583          * is set via sysfs or module option if desired.
1584          */
1585         new_slave->queue_id = 0;
1586
1587         /* Save slave's original mtu and then set it to match the bond */
1588         new_slave->original_mtu = slave_dev->mtu;
1589         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1590         if (res) {
1591                 pr_debug("Error %d calling dev_set_mtu\n", res);
1592                 goto err_free;
1593         }
1594
1595         /*
1596          * Save slave's original ("permanent") mac address for modes
1597          * that need it, and for restoring it upon release, and then
1598          * set it to the master's address
1599          */
1600         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1601
1602         if (!bond->params.fail_over_mac) {
1603                 /*
1604                  * Set slave to master's mac address.  The application already
1605                  * set the master's mac address to that of the first slave
1606                  */
1607                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1608                 addr.sa_family = slave_dev->type;
1609                 res = dev_set_mac_address(slave_dev, &addr);
1610                 if (res) {
1611                         pr_debug("Error %d calling set_mac_address\n", res);
1612                         goto err_restore_mtu;
1613                 }
1614         }
1615
1616         res = netdev_set_master(slave_dev, bond_dev);
1617         if (res) {
1618                 pr_debug("Error %d calling netdev_set_master\n", res);
1619                 goto err_restore_mac;
1620         }
1621         /* open the slave since the application closed it */
1622         res = dev_open(slave_dev);
1623         if (res) {
1624                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1625                 goto err_unset_master;
1626         }
1627
1628         new_slave->dev = slave_dev;
1629         slave_dev->priv_flags |= IFF_BONDING;
1630
1631         if (bond_is_lb(bond)) {
1632                 /* bond_alb_init_slave() must be called before all other stages since
1633                  * it might fail and we do not want to have to undo everything
1634                  */
1635                 res = bond_alb_init_slave(bond, new_slave);
1636                 if (res)
1637                         goto err_close;
1638         }
1639
1640         /* If the mode USES_PRIMARY, then the new slave gets the
1641          * master's promisc (and mc) settings only if it becomes the
1642          * curr_active_slave, and that is taken care of later when calling
1643          * bond_change_active()
1644          */
1645         if (!USES_PRIMARY(bond->params.mode)) {
1646                 /* set promiscuity level to new slave */
1647                 if (bond_dev->flags & IFF_PROMISC) {
1648                         res = dev_set_promiscuity(slave_dev, 1);
1649                         if (res)
1650                                 goto err_close;
1651                 }
1652
1653                 /* set allmulti level to new slave */
1654                 if (bond_dev->flags & IFF_ALLMULTI) {
1655                         res = dev_set_allmulti(slave_dev, 1);
1656                         if (res)
1657                                 goto err_close;
1658                 }
1659
1660                 netif_addr_lock_bh(bond_dev);
1661                 /* upload master's mc_list to new slave */
1662                 netdev_for_each_mc_addr(ha, bond_dev)
1663                         dev_mc_add(slave_dev, ha->addr);
1664                 netif_addr_unlock_bh(bond_dev);
1665         }
1666
1667         if (bond->params.mode == BOND_MODE_8023AD) {
1668                 /* add lacpdu mc addr to mc list */
1669                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1670
1671                 dev_mc_add(slave_dev, lacpdu_multicast);
1672         }
1673
1674         bond_add_vlans_on_slave(bond, slave_dev);
1675
1676         write_lock_bh(&bond->lock);
1677
1678         bond_attach_slave(bond, new_slave);
1679
1680         new_slave->delay = 0;
1681         new_slave->link_failure_count = 0;
1682
1683         bond_compute_features(bond);
1684
1685         write_unlock_bh(&bond->lock);
1686
1687         read_lock(&bond->lock);
1688
1689         new_slave->last_arp_rx = jiffies;
1690
1691         if (bond->params.miimon && !bond->params.use_carrier) {
1692                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1693
1694                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1695                         /*
1696                          * miimon is set but a bonded network driver
1697                          * does not support ETHTOOL/MII and
1698                          * arp_interval is not set.  Note: if
1699                          * use_carrier is enabled, we will never go
1700                          * here (because netif_carrier is always
1701                          * supported); thus, we don't need to change
1702                          * the messages for netif_carrier.
1703                          */
1704                         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",
1705                                bond_dev->name, slave_dev->name);
1706                 } else if (link_reporting == -1) {
1707                         /* unable get link status using mii/ethtool */
1708                         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",
1709                                    bond_dev->name, slave_dev->name);
1710                 }
1711         }
1712
1713         /* check for initial state */
1714         if (!bond->params.miimon ||
1715             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1716                 if (bond->params.updelay) {
1717                         pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1718                         new_slave->link  = BOND_LINK_BACK;
1719                         new_slave->delay = bond->params.updelay;
1720                 } else {
1721                         pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1722                         new_slave->link  = BOND_LINK_UP;
1723                 }
1724                 new_slave->jiffies = jiffies;
1725         } else {
1726                 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1727                 new_slave->link  = BOND_LINK_DOWN;
1728         }
1729
1730         if (bond_update_speed_duplex(new_slave) &&
1731             (new_slave->link != BOND_LINK_DOWN)) {
1732                 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n",
1733                            bond_dev->name, new_slave->dev->name);
1734
1735                 if (bond->params.mode == BOND_MODE_8023AD) {
1736                         pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n",
1737                                    bond_dev->name);
1738                 }
1739         }
1740
1741         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1742                 /* if there is a primary slave, remember it */
1743                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1744                         bond->primary_slave = new_slave;
1745                         bond->force_primary = true;
1746                 }
1747         }
1748
1749         write_lock_bh(&bond->curr_slave_lock);
1750
1751         switch (bond->params.mode) {
1752         case BOND_MODE_ACTIVEBACKUP:
1753                 bond_set_slave_inactive_flags(new_slave);
1754                 bond_select_active_slave(bond);
1755                 break;
1756         case BOND_MODE_8023AD:
1757                 /* in 802.3ad mode, the internal mechanism
1758                  * will activate the slaves in the selected
1759                  * aggregator
1760                  */
1761                 bond_set_slave_inactive_flags(new_slave);
1762                 /* if this is the first slave */
1763                 if (bond->slave_cnt == 1) {
1764                         SLAVE_AD_INFO(new_slave).id = 1;
1765                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1766                          * can be called only after the mac address of the bond is set
1767                          */
1768                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1769                                             bond->params.lacp_fast);
1770                 } else {
1771                         SLAVE_AD_INFO(new_slave).id =
1772                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1773                 }
1774
1775                 bond_3ad_bind_slave(new_slave);
1776                 break;
1777         case BOND_MODE_TLB:
1778         case BOND_MODE_ALB:
1779                 new_slave->state = BOND_STATE_ACTIVE;
1780                 bond_set_slave_inactive_flags(new_slave);
1781                 bond_select_active_slave(bond);
1782                 break;
1783         default:
1784                 pr_debug("This slave is always active in trunk mode\n");
1785
1786                 /* always active in trunk mode */
1787                 new_slave->state = BOND_STATE_ACTIVE;
1788
1789                 /* In trunking mode there is little meaning to curr_active_slave
1790                  * anyway (it holds no special properties of the bond device),
1791                  * so we can change it without calling change_active_interface()
1792                  */
1793                 if (!bond->curr_active_slave)
1794                         bond->curr_active_slave = new_slave;
1795
1796                 break;
1797         } /* switch(bond_mode) */
1798
1799         write_unlock_bh(&bond->curr_slave_lock);
1800
1801         bond_set_carrier(bond);
1802
1803 #ifdef CONFIG_NET_POLL_CONTROLLER
1804         /*
1805          * Netpoll and bonding is broken, make sure it is not initialized
1806          * until it is fixed.
1807          */
1808         if (disable_netpoll) {
1809                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1810         } else {
1811                 if (slaves_support_netpoll(bond_dev)) {
1812                         bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
1813                         if (bond_dev->npinfo)
1814                                 slave_dev->npinfo = bond_dev->npinfo;
1815                 } else if (!(bond_dev->priv_flags & IFF_DISABLE_NETPOLL)) {
1816                         bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1817                         pr_info("New slave device %s does not support netpoll\n",
1818                                 slave_dev->name);
1819                         pr_info("Disabling netpoll support for %s\n", bond_dev->name);
1820                 }
1821         }
1822 #endif
1823         read_unlock(&bond->lock);
1824
1825         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1826         if (res)
1827                 goto err_close;
1828
1829         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1830                 bond_dev->name, slave_dev->name,
1831                 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1832                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1833
1834         /* enslave is successful */
1835         return 0;
1836
1837 /* Undo stages on error */
1838 err_close:
1839         dev_close(slave_dev);
1840
1841 err_unset_master:
1842         netdev_set_master(slave_dev, NULL);
1843
1844 err_restore_mac:
1845         if (!bond->params.fail_over_mac) {
1846                 /* XXX TODO - fom follow mode needs to change master's
1847                  * MAC if this slave's MAC is in use by the bond, or at
1848                  * least print a warning.
1849                  */
1850                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1851                 addr.sa_family = slave_dev->type;
1852                 dev_set_mac_address(slave_dev, &addr);
1853         }
1854
1855 err_restore_mtu:
1856         dev_set_mtu(slave_dev, new_slave->original_mtu);
1857
1858 err_free:
1859         kfree(new_slave);
1860
1861 err_undo_flags:
1862         bond_dev->features = old_features;
1863
1864         return res;
1865 }
1866
1867 /*
1868  * Try to release the slave device <slave> from the bond device <master>
1869  * It is legal to access curr_active_slave without a lock because all the function
1870  * is write-locked.
1871  *
1872  * The rules for slave state should be:
1873  *   for Active/Backup:
1874  *     Active stays on all backups go down
1875  *   for Bonded connections:
1876  *     The first up interface should be left on and all others downed.
1877  */
1878 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1879 {
1880         struct bonding *bond = netdev_priv(bond_dev);
1881         struct slave *slave, *oldcurrent;
1882         struct sockaddr addr;
1883
1884         /* slave is not a slave or master is not master of this slave */
1885         if (!(slave_dev->flags & IFF_SLAVE) ||
1886             (slave_dev->master != bond_dev)) {
1887                 pr_err("%s: Error: cannot release %s.\n",
1888                        bond_dev->name, slave_dev->name);
1889                 return -EINVAL;
1890         }
1891
1892         netdev_bonding_change(bond_dev, NETDEV_BONDING_DESLAVE);
1893         write_lock_bh(&bond->lock);
1894
1895         slave = bond_get_slave_by_dev(bond, slave_dev);
1896         if (!slave) {
1897                 /* not a slave of this bond */
1898                 pr_info("%s: %s not enslaved\n",
1899                         bond_dev->name, slave_dev->name);
1900                 write_unlock_bh(&bond->lock);
1901                 return -EINVAL;
1902         }
1903
1904         if (!bond->params.fail_over_mac) {
1905                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1906                     bond->slave_cnt > 1)
1907                         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",
1908                                    bond_dev->name, slave_dev->name,
1909                                    slave->perm_hwaddr,
1910                                    bond_dev->name, slave_dev->name);
1911         }
1912
1913         /* Inform AD package of unbinding of slave. */
1914         if (bond->params.mode == BOND_MODE_8023AD) {
1915                 /* must be called before the slave is
1916                  * detached from the list
1917                  */
1918                 bond_3ad_unbind_slave(slave);
1919         }
1920
1921         pr_info("%s: releasing %s interface %s\n",
1922                 bond_dev->name,
1923                 (slave->state == BOND_STATE_ACTIVE) ? "active" : "backup",
1924                 slave_dev->name);
1925
1926         oldcurrent = bond->curr_active_slave;
1927
1928         bond->current_arp_slave = NULL;
1929
1930         /* release the slave from its bond */
1931         bond_detach_slave(bond, slave);
1932
1933         bond_compute_features(bond);
1934
1935         if (bond->primary_slave == slave)
1936                 bond->primary_slave = NULL;
1937
1938         if (oldcurrent == slave)
1939                 bond_change_active_slave(bond, NULL);
1940
1941         if (bond_is_lb(bond)) {
1942                 /* Must be called only after the slave has been
1943                  * detached from the list and the curr_active_slave
1944                  * has been cleared (if our_slave == old_current),
1945                  * but before a new active slave is selected.
1946                  */
1947                 write_unlock_bh(&bond->lock);
1948                 bond_alb_deinit_slave(bond, slave);
1949                 write_lock_bh(&bond->lock);
1950         }
1951
1952         if (oldcurrent == slave) {
1953                 /*
1954                  * Note that we hold RTNL over this sequence, so there
1955                  * is no concern that another slave add/remove event
1956                  * will interfere.
1957                  */
1958                 write_unlock_bh(&bond->lock);
1959                 read_lock(&bond->lock);
1960                 write_lock_bh(&bond->curr_slave_lock);
1961
1962                 bond_select_active_slave(bond);
1963
1964                 write_unlock_bh(&bond->curr_slave_lock);
1965                 read_unlock(&bond->lock);
1966                 write_lock_bh(&bond->lock);
1967         }
1968
1969         if (bond->slave_cnt == 0) {
1970                 bond_set_carrier(bond);
1971
1972                 /* if the last slave was removed, zero the mac address
1973                  * of the master so it will be set by the application
1974                  * to the mac address of the first slave
1975                  */
1976                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1977
1978                 if (!bond->vlgrp) {
1979                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1980                 } else {
1981                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1982                                    bond_dev->name, bond_dev->name);
1983                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1984                                    bond_dev->name);
1985                 }
1986         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1987                    !bond_has_challenged_slaves(bond)) {
1988                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1989                         bond_dev->name, slave_dev->name, bond_dev->name);
1990                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1991         }
1992
1993         write_unlock_bh(&bond->lock);
1994
1995         /* must do this from outside any spinlocks */
1996         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1997
1998         bond_del_vlans_from_slave(bond, slave_dev);
1999
2000         /* If the mode USES_PRIMARY, then we should only remove its
2001          * promisc and mc settings if it was the curr_active_slave, but that was
2002          * already taken care of above when we detached the slave
2003          */
2004         if (!USES_PRIMARY(bond->params.mode)) {
2005                 /* unset promiscuity level from slave */
2006                 if (bond_dev->flags & IFF_PROMISC)
2007                         dev_set_promiscuity(slave_dev, -1);
2008
2009                 /* unset allmulti level from slave */
2010                 if (bond_dev->flags & IFF_ALLMULTI)
2011                         dev_set_allmulti(slave_dev, -1);
2012
2013                 /* flush master's mc_list from slave */
2014                 netif_addr_lock_bh(bond_dev);
2015                 bond_mc_list_flush(bond_dev, slave_dev);
2016                 netif_addr_unlock_bh(bond_dev);
2017         }
2018
2019         netdev_set_master(slave_dev, NULL);
2020
2021 #ifdef CONFIG_NET_POLL_CONTROLLER
2022         read_lock_bh(&bond->lock);
2023
2024          /* Make sure netpoll over stays disabled until fixed. */
2025         if (!disable_netpoll)
2026                 if (slaves_support_netpoll(bond_dev))
2027                                 bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
2028         read_unlock_bh(&bond->lock);
2029         if (slave_dev->netdev_ops->ndo_netpoll_cleanup)
2030                 slave_dev->netdev_ops->ndo_netpoll_cleanup(slave_dev);
2031         else
2032                 slave_dev->npinfo = NULL;
2033 #endif
2034
2035         /* close slave before restoring its mac address */
2036         dev_close(slave_dev);
2037
2038         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2039                 /* restore original ("permanent") mac address */
2040                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2041                 addr.sa_family = slave_dev->type;
2042                 dev_set_mac_address(slave_dev, &addr);
2043         }
2044
2045         dev_set_mtu(slave_dev, slave->original_mtu);
2046
2047         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2048                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
2049                                    IFF_SLAVE_NEEDARP);
2050
2051         kfree(slave);
2052
2053         return 0;  /* deletion OK */
2054 }
2055
2056 /*
2057 * First release a slave and than destroy the bond if no more slaves are left.
2058 * Must be under rtnl_lock when this function is called.
2059 */
2060 int  bond_release_and_destroy(struct net_device *bond_dev,
2061                               struct net_device *slave_dev)
2062 {
2063         struct bonding *bond = netdev_priv(bond_dev);
2064         int ret;
2065
2066         ret = bond_release(bond_dev, slave_dev);
2067         if ((ret == 0) && (bond->slave_cnt == 0)) {
2068                 pr_info("%s: destroying bond %s.\n",
2069                         bond_dev->name, bond_dev->name);
2070                 unregister_netdevice(bond_dev);
2071         }
2072         return ret;
2073 }
2074
2075 /*
2076  * This function releases all slaves.
2077  */
2078 static int bond_release_all(struct net_device *bond_dev)
2079 {
2080         struct bonding *bond = netdev_priv(bond_dev);
2081         struct slave *slave;
2082         struct net_device *slave_dev;
2083         struct sockaddr addr;
2084
2085         write_lock_bh(&bond->lock);
2086
2087         netif_carrier_off(bond_dev);
2088
2089         if (bond->slave_cnt == 0)
2090                 goto out;
2091
2092         bond->current_arp_slave = NULL;
2093         bond->primary_slave = NULL;
2094         bond_change_active_slave(bond, NULL);
2095
2096         while ((slave = bond->first_slave) != NULL) {
2097                 /* Inform AD package of unbinding of slave
2098                  * before slave is detached from the list.
2099                  */
2100                 if (bond->params.mode == BOND_MODE_8023AD)
2101                         bond_3ad_unbind_slave(slave);
2102
2103                 slave_dev = slave->dev;
2104                 bond_detach_slave(bond, slave);
2105
2106                 /* now that the slave is detached, unlock and perform
2107                  * all the undo steps that should not be called from
2108                  * within a lock.
2109                  */
2110                 write_unlock_bh(&bond->lock);
2111
2112                 if (bond_is_lb(bond)) {
2113                         /* must be called only after the slave
2114                          * has been detached from the list
2115                          */
2116                         bond_alb_deinit_slave(bond, slave);
2117                 }
2118
2119                 bond_compute_features(bond);
2120
2121                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2122                 bond_del_vlans_from_slave(bond, slave_dev);
2123
2124                 /* If the mode USES_PRIMARY, then we should only remove its
2125                  * promisc and mc settings if it was the curr_active_slave, but that was
2126                  * already taken care of above when we detached the slave
2127                  */
2128                 if (!USES_PRIMARY(bond->params.mode)) {
2129                         /* unset promiscuity level from slave */
2130                         if (bond_dev->flags & IFF_PROMISC)
2131                                 dev_set_promiscuity(slave_dev, -1);
2132
2133                         /* unset allmulti level from slave */
2134                         if (bond_dev->flags & IFF_ALLMULTI)
2135                                 dev_set_allmulti(slave_dev, -1);
2136
2137                         /* flush master's mc_list from slave */
2138                         netif_addr_lock_bh(bond_dev);
2139                         bond_mc_list_flush(bond_dev, slave_dev);
2140                         netif_addr_unlock_bh(bond_dev);
2141                 }
2142
2143                 netdev_set_master(slave_dev, NULL);
2144
2145                 /* close slave before restoring its mac address */
2146                 dev_close(slave_dev);
2147
2148                 if (!bond->params.fail_over_mac) {
2149                         /* restore original ("permanent") mac address*/
2150                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2151                         addr.sa_family = slave_dev->type;
2152                         dev_set_mac_address(slave_dev, &addr);
2153                 }
2154
2155                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2156                                            IFF_SLAVE_INACTIVE);
2157
2158                 kfree(slave);
2159
2160                 /* re-acquire the lock before getting the next slave */
2161                 write_lock_bh(&bond->lock);
2162         }
2163
2164         /* zero the mac address of the master so it will be
2165          * set by the application to the mac address of the
2166          * first slave
2167          */
2168         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2169
2170         if (!bond->vlgrp) {
2171                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2172         } else {
2173                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2174                            bond_dev->name, bond_dev->name);
2175                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2176                            bond_dev->name);
2177         }
2178
2179         pr_info("%s: released all slaves\n", bond_dev->name);
2180
2181 out:
2182         write_unlock_bh(&bond->lock);
2183
2184         return 0;
2185 }
2186
2187 /*
2188  * This function changes the active slave to slave <slave_dev>.
2189  * It returns -EINVAL in the following cases.
2190  *  - <slave_dev> is not found in the list.
2191  *  - There is not active slave now.
2192  *  - <slave_dev> is already active.
2193  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2194  *  - <slave_dev> is not running.
2195  * In these cases, this function does nothing.
2196  * In the other cases, current_slave pointer is changed and 0 is returned.
2197  */
2198 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2199 {
2200         struct bonding *bond = netdev_priv(bond_dev);
2201         struct slave *old_active = NULL;
2202         struct slave *new_active = NULL;
2203         int res = 0;
2204
2205         if (!USES_PRIMARY(bond->params.mode))
2206                 return -EINVAL;
2207
2208         /* Verify that master_dev is indeed the master of slave_dev */
2209         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2210                 return -EINVAL;
2211
2212         read_lock(&bond->lock);
2213
2214         read_lock(&bond->curr_slave_lock);
2215         old_active = bond->curr_active_slave;
2216         read_unlock(&bond->curr_slave_lock);
2217
2218         new_active = bond_get_slave_by_dev(bond, slave_dev);
2219
2220         /*
2221          * Changing to the current active: do nothing; return success.
2222          */
2223         if (new_active && (new_active == old_active)) {
2224                 read_unlock(&bond->lock);
2225                 return 0;
2226         }
2227
2228         if ((new_active) &&
2229             (old_active) &&
2230             (new_active->link == BOND_LINK_UP) &&
2231             IS_UP(new_active->dev)) {
2232                 write_lock_bh(&bond->curr_slave_lock);
2233                 bond_change_active_slave(bond, new_active);
2234                 write_unlock_bh(&bond->curr_slave_lock);
2235         } else
2236                 res = -EINVAL;
2237
2238         read_unlock(&bond->lock);
2239
2240         return res;
2241 }
2242
2243 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2244 {
2245         struct bonding *bond = netdev_priv(bond_dev);
2246
2247         info->bond_mode = bond->params.mode;
2248         info->miimon = bond->params.miimon;
2249
2250         read_lock(&bond->lock);
2251         info->num_slaves = bond->slave_cnt;
2252         read_unlock(&bond->lock);
2253
2254         return 0;
2255 }
2256
2257 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2258 {
2259         struct bonding *bond = netdev_priv(bond_dev);
2260         struct slave *slave;
2261         int i, res = -ENODEV;
2262
2263         read_lock(&bond->lock);
2264
2265         bond_for_each_slave(bond, slave, i) {
2266                 if (i == (int)info->slave_id) {
2267                         res = 0;
2268                         strcpy(info->slave_name, slave->dev->name);
2269                         info->link = slave->link;
2270                         info->state = slave->state;
2271                         info->link_failure_count = slave->link_failure_count;
2272                         break;
2273                 }
2274         }
2275
2276         read_unlock(&bond->lock);
2277
2278         return res;
2279 }
2280
2281 /*-------------------------------- Monitoring -------------------------------*/
2282
2283
2284 static int bond_miimon_inspect(struct bonding *bond)
2285 {
2286         struct slave *slave;
2287         int i, link_state, commit = 0;
2288         bool ignore_updelay;
2289
2290         ignore_updelay = !bond->curr_active_slave ? true : false;
2291
2292         bond_for_each_slave(bond, slave, i) {
2293                 slave->new_link = BOND_LINK_NOCHANGE;
2294
2295                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2296
2297                 switch (slave->link) {
2298                 case BOND_LINK_UP:
2299                         if (link_state)
2300                                 continue;
2301
2302                         slave->link = BOND_LINK_FAIL;
2303                         slave->delay = bond->params.downdelay;
2304                         if (slave->delay) {
2305                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2306                                         bond->dev->name,
2307                                         (bond->params.mode ==
2308                                          BOND_MODE_ACTIVEBACKUP) ?
2309                                         ((slave->state == BOND_STATE_ACTIVE) ?
2310                                          "active " : "backup ") : "",
2311                                         slave->dev->name,
2312                                         bond->params.downdelay * bond->params.miimon);
2313                         }
2314                         /*FALLTHRU*/
2315                 case BOND_LINK_FAIL:
2316                         if (link_state) {
2317                                 /*
2318                                  * recovered before downdelay expired
2319                                  */
2320                                 slave->link = BOND_LINK_UP;
2321                                 slave->jiffies = jiffies;
2322                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2323                                         bond->dev->name,
2324                                         (bond->params.downdelay - slave->delay) *
2325                                         bond->params.miimon,
2326                                         slave->dev->name);
2327                                 continue;
2328                         }
2329
2330                         if (slave->delay <= 0) {
2331                                 slave->new_link = BOND_LINK_DOWN;
2332                                 commit++;
2333                                 continue;
2334                         }
2335
2336                         slave->delay--;
2337                         break;
2338
2339                 case BOND_LINK_DOWN:
2340                         if (!link_state)
2341                                 continue;
2342
2343                         slave->link = BOND_LINK_BACK;
2344                         slave->delay = bond->params.updelay;
2345
2346                         if (slave->delay) {
2347                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2348                                         bond->dev->name, slave->dev->name,
2349                                         ignore_updelay ? 0 :
2350                                         bond->params.updelay *
2351                                         bond->params.miimon);
2352                         }
2353                         /*FALLTHRU*/
2354                 case BOND_LINK_BACK:
2355                         if (!link_state) {
2356                                 slave->link = BOND_LINK_DOWN;
2357                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2358                                         bond->dev->name,
2359                                         (bond->params.updelay - slave->delay) *
2360                                         bond->params.miimon,
2361                                         slave->dev->name);
2362
2363                                 continue;
2364                         }
2365
2366                         if (ignore_updelay)
2367                                 slave->delay = 0;
2368
2369                         if (slave->delay <= 0) {
2370                                 slave->new_link = BOND_LINK_UP;
2371                                 commit++;
2372                                 ignore_updelay = false;
2373                                 continue;
2374                         }
2375
2376                         slave->delay--;
2377                         break;
2378                 }
2379         }
2380
2381         return commit;
2382 }
2383
2384 static void bond_miimon_commit(struct bonding *bond)
2385 {
2386         struct slave *slave;
2387         int i;
2388
2389         bond_for_each_slave(bond, slave, i) {
2390                 switch (slave->new_link) {
2391                 case BOND_LINK_NOCHANGE:
2392                         continue;
2393
2394                 case BOND_LINK_UP:
2395                         slave->link = BOND_LINK_UP;
2396                         slave->jiffies = jiffies;
2397
2398                         if (bond->params.mode == BOND_MODE_8023AD) {
2399                                 /* prevent it from being the active one */
2400                                 slave->state = BOND_STATE_BACKUP;
2401                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2402                                 /* make it immediately active */
2403                                 slave->state = BOND_STATE_ACTIVE;
2404                         } else if (slave != bond->primary_slave) {
2405                                 /* prevent it from being the active one */
2406                                 slave->state = BOND_STATE_BACKUP;
2407                         }
2408
2409                         bond_update_speed_duplex(slave);
2410
2411                         pr_info("%s: link status definitely up for interface %s, %d Mbps %s duplex.\n",
2412                                 bond->dev->name, slave->dev->name,
2413                                 slave->speed, slave->duplex ? "full" : "half");
2414
2415                         /* notify ad that the link status has changed */
2416                         if (bond->params.mode == BOND_MODE_8023AD)
2417                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2418
2419                         if (bond_is_lb(bond))
2420                                 bond_alb_handle_link_change(bond, slave,
2421                                                             BOND_LINK_UP);
2422
2423                         if (!bond->curr_active_slave ||
2424                             (slave == bond->primary_slave))
2425                                 goto do_failover;
2426
2427                         continue;
2428
2429                 case BOND_LINK_DOWN:
2430                         if (slave->link_failure_count < UINT_MAX)
2431                                 slave->link_failure_count++;
2432
2433                         slave->link = BOND_LINK_DOWN;
2434
2435                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2436                             bond->params.mode == BOND_MODE_8023AD)
2437                                 bond_set_slave_inactive_flags(slave);
2438
2439                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2440                                 bond->dev->name, slave->dev->name);
2441
2442                         if (bond->params.mode == BOND_MODE_8023AD)
2443                                 bond_3ad_handle_link_change(slave,
2444                                                             BOND_LINK_DOWN);
2445
2446                         if (bond_is_lb(bond))
2447                                 bond_alb_handle_link_change(bond, slave,
2448                                                             BOND_LINK_DOWN);
2449
2450                         if (slave == bond->curr_active_slave)
2451                                 goto do_failover;
2452
2453                         continue;
2454
2455                 default:
2456                         pr_err("%s: invalid new link %d on slave %s\n",
2457                                bond->dev->name, slave->new_link,
2458                                slave->dev->name);
2459                         slave->new_link = BOND_LINK_NOCHANGE;
2460
2461                         continue;
2462                 }
2463
2464 do_failover:
2465                 ASSERT_RTNL();
2466                 write_lock_bh(&bond->curr_slave_lock);
2467                 bond_select_active_slave(bond);
2468                 write_unlock_bh(&bond->curr_slave_lock);
2469         }
2470
2471         bond_set_carrier(bond);
2472 }
2473
2474 /*
2475  * bond_mii_monitor
2476  *
2477  * Really a wrapper that splits the mii monitor into two phases: an
2478  * inspection, then (if inspection indicates something needs to be done)
2479  * an acquisition of appropriate locks followed by a commit phase to
2480  * implement whatever link state changes are indicated.
2481  */
2482 void bond_mii_monitor(struct work_struct *work)
2483 {
2484         struct bonding *bond = container_of(work, struct bonding,
2485                                             mii_work.work);
2486
2487         read_lock(&bond->lock);
2488         if (bond->kill_timers)
2489                 goto out;
2490
2491         if (bond->slave_cnt == 0)
2492                 goto re_arm;
2493
2494         if (bond->send_grat_arp) {
2495                 read_lock(&bond->curr_slave_lock);
2496                 bond_send_gratuitous_arp(bond);
2497                 read_unlock(&bond->curr_slave_lock);
2498         }
2499
2500         if (bond->send_unsol_na) {
2501                 read_lock(&bond->curr_slave_lock);
2502                 bond_send_unsolicited_na(bond);
2503                 read_unlock(&bond->curr_slave_lock);
2504         }
2505
2506         if (bond_miimon_inspect(bond)) {
2507                 read_unlock(&bond->lock);
2508                 rtnl_lock();
2509                 read_lock(&bond->lock);
2510
2511                 bond_miimon_commit(bond);
2512
2513                 read_unlock(&bond->lock);
2514                 rtnl_unlock();  /* might sleep, hold no other locks */
2515                 read_lock(&bond->lock);
2516         }
2517
2518 re_arm:
2519         if (bond->params.miimon)
2520                 queue_delayed_work(bond->wq, &bond->mii_work,
2521                                    msecs_to_jiffies(bond->params.miimon));
2522 out:
2523         read_unlock(&bond->lock);
2524 }
2525
2526 static __be32 bond_glean_dev_ip(struct net_device *dev)
2527 {
2528         struct in_device *idev;
2529         struct in_ifaddr *ifa;
2530         __be32 addr = 0;
2531
2532         if (!dev)
2533                 return 0;
2534
2535         rcu_read_lock();
2536         idev = __in_dev_get_rcu(dev);
2537         if (!idev)
2538                 goto out;
2539
2540         ifa = idev->ifa_list;
2541         if (!ifa)
2542                 goto out;
2543
2544         addr = ifa->ifa_local;
2545 out:
2546         rcu_read_unlock();
2547         return addr;
2548 }
2549
2550 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2551 {
2552         struct vlan_entry *vlan;
2553
2554         if (ip == bond->master_ip)
2555                 return 1;
2556
2557         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2558                 if (ip == vlan->vlan_ip)
2559                         return 1;
2560         }
2561
2562         return 0;
2563 }
2564
2565 /*
2566  * We go to the (large) trouble of VLAN tagging ARP frames because
2567  * switches in VLAN mode (especially if ports are configured as
2568  * "native" to a VLAN) might not pass non-tagged frames.
2569  */
2570 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2571 {
2572         struct sk_buff *skb;
2573
2574         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2575                  slave_dev->name, dest_ip, src_ip, vlan_id);
2576
2577         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2578                          NULL, slave_dev->dev_addr, NULL);
2579
2580         if (!skb) {
2581                 pr_err("ARP packet allocation failed\n");
2582                 return;
2583         }
2584         if (vlan_id) {
2585                 skb = vlan_put_tag(skb, vlan_id);
2586                 if (!skb) {
2587                         pr_err("failed to insert VLAN tag\n");
2588                         return;
2589                 }
2590         }
2591         arp_xmit(skb);
2592 }
2593
2594
2595 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2596 {
2597         int i, vlan_id, rv;
2598         __be32 *targets = bond->params.arp_targets;
2599         struct vlan_entry *vlan;
2600         struct net_device *vlan_dev;
2601         struct flowi fl;
2602         struct rtable *rt;
2603
2604         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2605                 if (!targets[i])
2606                         break;
2607                 pr_debug("basa: target %x\n", targets[i]);
2608                 if (!bond->vlgrp) {
2609                         pr_debug("basa: empty vlan: arp_send\n");
2610                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2611                                       bond->master_ip, 0);
2612                         continue;
2613                 }
2614
2615                 /*
2616                  * If VLANs are configured, we do a route lookup to
2617                  * determine which VLAN interface would be used, so we
2618                  * can tag the ARP with the proper VLAN tag.
2619                  */
2620                 memset(&fl, 0, sizeof(fl));
2621                 fl.fl4_dst = targets[i];
2622                 fl.fl4_tos = RTO_ONLINK;
2623
2624                 rv = ip_route_output_key(dev_net(bond->dev), &rt, &fl);
2625                 if (rv) {
2626                         if (net_ratelimit()) {
2627                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2628                                            bond->dev->name, &fl.fl4_dst);
2629                         }
2630                         continue;
2631                 }
2632
2633                 /*
2634                  * This target is not on a VLAN
2635                  */
2636                 if (rt->dst.dev == bond->dev) {
2637                         ip_rt_put(rt);
2638                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2639                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2640                                       bond->master_ip, 0);
2641                         continue;
2642                 }
2643
2644                 vlan_id = 0;
2645                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2646                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2647                         if (vlan_dev == rt->dst.dev) {
2648                                 vlan_id = vlan->vlan_id;
2649                                 pr_debug("basa: vlan match on %s %d\n",
2650                                        vlan_dev->name, vlan_id);
2651                                 break;
2652                         }
2653                 }
2654
2655                 if (vlan_id) {
2656                         ip_rt_put(rt);
2657                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2658                                       vlan->vlan_ip, vlan_id);
2659                         continue;
2660                 }
2661
2662                 if (net_ratelimit()) {
2663                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2664                                    bond->dev->name, &fl.fl4_dst,
2665                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2666                 }
2667                 ip_rt_put(rt);
2668         }
2669 }
2670
2671 /*
2672  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2673  * for each VLAN above us.
2674  *
2675  * Caller must hold curr_slave_lock for read or better
2676  */
2677 static void bond_send_gratuitous_arp(struct bonding *bond)
2678 {
2679         struct slave *slave = bond->curr_active_slave;
2680         struct vlan_entry *vlan;
2681         struct net_device *vlan_dev;
2682
2683         pr_debug("bond_send_grat_arp: bond %s slave %s\n",
2684                  bond->dev->name, slave ? slave->dev->name : "NULL");
2685
2686         if (!slave || !bond->send_grat_arp ||
2687             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2688                 return;
2689
2690         bond->send_grat_arp--;
2691
2692         if (bond->master_ip) {
2693                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2694                                 bond->master_ip, 0);
2695         }
2696
2697         if (!bond->vlgrp)
2698                 return;
2699
2700         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2701                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2702                 if (vlan->vlan_ip) {
2703                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2704                                       vlan->vlan_ip, vlan->vlan_id);
2705                 }
2706         }
2707 }
2708
2709 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2710 {
2711         int i;
2712         __be32 *targets = bond->params.arp_targets;
2713
2714         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2715                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2716                          &sip, &tip, i, &targets[i],
2717                          bond_has_this_ip(bond, tip));
2718                 if (sip == targets[i]) {
2719                         if (bond_has_this_ip(bond, tip))
2720                                 slave->last_arp_rx = jiffies;
2721                         return;
2722                 }
2723         }
2724 }
2725
2726 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2727 {
2728         struct arphdr *arp;
2729         struct slave *slave;
2730         struct bonding *bond;
2731         unsigned char *arp_ptr;
2732         __be32 sip, tip;
2733
2734         if (dev->priv_flags & IFF_802_1Q_VLAN) {
2735                 /*
2736                  * When using VLANS and bonding, dev and oriv_dev may be
2737                  * incorrect if the physical interface supports VLAN
2738                  * acceleration.  With this change ARP validation now
2739                  * works for hosts only reachable on the VLAN interface.
2740                  */
2741                 dev = vlan_dev_real_dev(dev);
2742                 orig_dev = dev_get_by_index_rcu(dev_net(skb->dev),skb->skb_iif);
2743         }
2744
2745         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2746                 goto out;
2747
2748         bond = netdev_priv(dev);
2749         read_lock(&bond->lock);
2750
2751         pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2752                  bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2753                  orig_dev ? orig_dev->name : "NULL");
2754
2755         slave = bond_get_slave_by_dev(bond, orig_dev);
2756         if (!slave || !slave_do_arp_validate(bond, slave))
2757                 goto out_unlock;
2758
2759         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2760                 goto out_unlock;
2761
2762         arp = arp_hdr(skb);
2763         if (arp->ar_hln != dev->addr_len ||
2764             skb->pkt_type == PACKET_OTHERHOST ||
2765             skb->pkt_type == PACKET_LOOPBACK ||
2766             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2767             arp->ar_pro != htons(ETH_P_IP) ||
2768             arp->ar_pln != 4)
2769                 goto out_unlock;
2770
2771         arp_ptr = (unsigned char *)(arp + 1);
2772         arp_ptr += dev->addr_len;
2773         memcpy(&sip, arp_ptr, 4);
2774         arp_ptr += 4 + dev->addr_len;
2775         memcpy(&tip, arp_ptr, 4);
2776
2777         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2778                  bond->dev->name, slave->dev->name, slave->state,
2779                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2780                  &sip, &tip);
2781
2782         /*
2783          * Backup slaves won't see the ARP reply, but do come through
2784          * here for each ARP probe (so we swap the sip/tip to validate
2785          * the probe).  In a "redundant switch, common router" type of
2786          * configuration, the ARP probe will (hopefully) travel from
2787          * the active, through one switch, the router, then the other
2788          * switch before reaching the backup.
2789          */
2790         if (slave->state == BOND_STATE_ACTIVE)
2791                 bond_validate_arp(bond, slave, sip, tip);
2792         else
2793                 bond_validate_arp(bond, slave, tip, sip);
2794
2795 out_unlock:
2796         read_unlock(&bond->lock);
2797 out:
2798         dev_kfree_skb(skb);
2799         return NET_RX_SUCCESS;
2800 }
2801
2802 /*
2803  * this function is called regularly to monitor each slave's link
2804  * ensuring that traffic is being sent and received when arp monitoring
2805  * is used in load-balancing mode. if the adapter has been dormant, then an
2806  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2807  * arp monitoring in active backup mode.
2808  */
2809 void bond_loadbalance_arp_mon(struct work_struct *work)
2810 {
2811         struct bonding *bond = container_of(work, struct bonding,
2812                                             arp_work.work);
2813         struct slave *slave, *oldcurrent;
2814         int do_failover = 0;
2815         int delta_in_ticks;
2816         int i;
2817
2818         read_lock(&bond->lock);
2819
2820         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2821
2822         if (bond->kill_timers)
2823                 goto out;
2824
2825         if (bond->slave_cnt == 0)
2826                 goto re_arm;
2827
2828         read_lock(&bond->curr_slave_lock);
2829         oldcurrent = bond->curr_active_slave;
2830         read_unlock(&bond->curr_slave_lock);
2831
2832         /* see if any of the previous devices are up now (i.e. they have
2833          * xmt and rcv traffic). the curr_active_slave does not come into
2834          * the picture unless it is null. also, slave->jiffies is not needed
2835          * here because we send an arp on each slave and give a slave as
2836          * long as it needs to get the tx/rx within the delta.
2837          * TODO: what about up/down delay in arp mode? it wasn't here before
2838          *       so it can wait
2839          */
2840         bond_for_each_slave(bond, slave, i) {
2841                 unsigned long trans_start = dev_trans_start(slave->dev);
2842
2843                 if (slave->link != BOND_LINK_UP) {
2844                         if (time_in_range(jiffies,
2845                                 trans_start - delta_in_ticks,
2846                                 trans_start + delta_in_ticks) &&
2847                             time_in_range(jiffies,
2848                                 slave->dev->last_rx - delta_in_ticks,
2849                                 slave->dev->last_rx + delta_in_ticks)) {
2850
2851                                 slave->link  = BOND_LINK_UP;
2852                                 slave->state = BOND_STATE_ACTIVE;
2853
2854                                 /* primary_slave has no meaning in round-robin
2855                                  * mode. the window of a slave being up and
2856                                  * curr_active_slave being null after enslaving
2857                                  * is closed.
2858                                  */
2859                                 if (!oldcurrent) {
2860                                         pr_info("%s: link status definitely up for interface %s, ",
2861                                                 bond->dev->name,
2862                                                 slave->dev->name);
2863                                         do_failover = 1;
2864                                 } else {
2865                                         pr_info("%s: interface %s is now up\n",
2866                                                 bond->dev->name,
2867                                                 slave->dev->name);
2868                                 }
2869                         }
2870                 } else {
2871                         /* slave->link == BOND_LINK_UP */
2872
2873                         /* not all switches will respond to an arp request
2874                          * when the source ip is 0, so don't take the link down
2875                          * if we don't know our ip yet
2876                          */
2877                         if (!time_in_range(jiffies,
2878                                 trans_start - delta_in_ticks,
2879                                 trans_start + 2 * delta_in_ticks) ||
2880                             !time_in_range(jiffies,
2881                                 slave->dev->last_rx - delta_in_ticks,
2882                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2883
2884                                 slave->link  = BOND_LINK_DOWN;
2885                                 slave->state = BOND_STATE_BACKUP;
2886
2887                                 if (slave->link_failure_count < UINT_MAX)
2888                                         slave->link_failure_count++;
2889
2890                                 pr_info("%s: interface %s is now down.\n",
2891                                         bond->dev->name,
2892                                         slave->dev->name);
2893
2894                                 if (slave == oldcurrent)
2895                                         do_failover = 1;
2896                         }
2897                 }
2898
2899                 /* note: if switch is in round-robin mode, all links
2900                  * must tx arp to ensure all links rx an arp - otherwise
2901                  * links may oscillate or not come up at all; if switch is
2902                  * in something like xor mode, there is nothing we can
2903                  * do - all replies will be rx'ed on same link causing slaves
2904                  * to be unstable during low/no traffic periods
2905                  */
2906                 if (IS_UP(slave->dev))
2907                         bond_arp_send_all(bond, slave);
2908         }
2909
2910         if (do_failover) {
2911                 write_lock_bh(&bond->curr_slave_lock);
2912
2913                 bond_select_active_slave(bond);
2914
2915                 write_unlock_bh(&bond->curr_slave_lock);
2916         }
2917
2918 re_arm:
2919         if (bond->params.arp_interval)
2920                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2921 out:
2922         read_unlock(&bond->lock);
2923 }
2924
2925 /*
2926  * Called to inspect slaves for active-backup mode ARP monitor link state
2927  * changes.  Sets new_link in slaves to specify what action should take
2928  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2929  * to link states must be committed.
2930  *
2931  * Called with bond->lock held for read.
2932  */
2933 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2934 {
2935         struct slave *slave;
2936         int i, commit = 0;
2937         unsigned long trans_start;
2938
2939         bond_for_each_slave(bond, slave, i) {
2940                 slave->new_link = BOND_LINK_NOCHANGE;
2941
2942                 if (slave->link != BOND_LINK_UP) {
2943                         if (time_in_range(jiffies,
2944                                 slave_last_rx(bond, slave) - delta_in_ticks,
2945                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2946
2947                                 slave->new_link = BOND_LINK_UP;
2948                                 commit++;
2949                         }
2950
2951                         continue;
2952                 }
2953
2954                 /*
2955                  * Give slaves 2*delta after being enslaved or made
2956                  * active.  This avoids bouncing, as the last receive
2957                  * times need a full ARP monitor cycle to be updated.
2958                  */
2959                 if (time_in_range(jiffies,
2960                                   slave->jiffies - delta_in_ticks,
2961                                   slave->jiffies + 2 * delta_in_ticks))
2962                         continue;
2963
2964                 /*
2965                  * Backup slave is down if:
2966                  * - No current_arp_slave AND
2967                  * - more than 3*delta since last receive AND
2968                  * - the bond has an IP address
2969                  *
2970                  * Note: a non-null current_arp_slave indicates
2971                  * the curr_active_slave went down and we are
2972                  * searching for a new one; under this condition
2973                  * we only take the curr_active_slave down - this
2974                  * gives each slave a chance to tx/rx traffic
2975                  * before being taken out
2976                  */
2977                 if (slave->state == BOND_STATE_BACKUP &&
2978                     !bond->current_arp_slave &&
2979                     !time_in_range(jiffies,
2980                         slave_last_rx(bond, slave) - delta_in_ticks,
2981                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2982
2983                         slave->new_link = BOND_LINK_DOWN;
2984                         commit++;
2985                 }
2986
2987                 /*
2988                  * Active slave is down if:
2989                  * - more than 2*delta since transmitting OR
2990                  * - (more than 2*delta since receive AND
2991                  *    the bond has an IP address)
2992                  */
2993                 trans_start = dev_trans_start(slave->dev);
2994                 if ((slave->state == BOND_STATE_ACTIVE) &&
2995                     (!time_in_range(jiffies,
2996                         trans_start - delta_in_ticks,
2997                         trans_start + 2 * delta_in_ticks) ||
2998                      !time_in_range(jiffies,
2999                         slave_last_rx(bond, slave) - delta_in_ticks,
3000                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
3001
3002                         slave->new_link = BOND_LINK_DOWN;
3003                         commit++;
3004                 }
3005         }
3006
3007         return commit;
3008 }
3009
3010 /*
3011  * Called to commit link state changes noted by inspection step of
3012  * active-backup mode ARP monitor.
3013  *
3014  * Called with RTNL and bond->lock for read.
3015  */
3016 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3017 {
3018         struct slave *slave;
3019         int i;
3020         unsigned long trans_start;
3021
3022         bond_for_each_slave(bond, slave, i) {
3023                 switch (slave->new_link) {
3024                 case BOND_LINK_NOCHANGE:
3025                         continue;
3026
3027                 case BOND_LINK_UP:
3028                         trans_start = dev_trans_start(slave->dev);
3029                         if ((!bond->curr_active_slave &&
3030                              time_in_range(jiffies,
3031                                            trans_start - delta_in_ticks,
3032                                            trans_start + delta_in_ticks)) ||
3033                             bond->curr_active_slave != slave) {
3034                                 slave->link = BOND_LINK_UP;
3035                                 bond->current_arp_slave = NULL;
3036
3037                                 pr_info("%s: link status definitely up for interface %s.\n",
3038                                         bond->dev->name, slave->dev->name);
3039
3040                                 if (!bond->curr_active_slave ||
3041                                     (slave == bond->primary_slave))
3042                                         goto do_failover;
3043
3044                         }
3045
3046                         continue;
3047
3048                 case BOND_LINK_DOWN:
3049                         if (slave->link_failure_count < UINT_MAX)
3050                                 slave->link_failure_count++;
3051
3052                         slave->link = BOND_LINK_DOWN;
3053                         bond_set_slave_inactive_flags(slave);
3054
3055                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3056                                 bond->dev->name, slave->dev->name);
3057
3058                         if (slave == bond->curr_active_slave) {
3059                                 bond->current_arp_slave = NULL;
3060                                 goto do_failover;
3061                         }
3062
3063                         continue;
3064
3065                 default:
3066                         pr_err("%s: impossible: new_link %d on slave %s\n",
3067                                bond->dev->name, slave->new_link,
3068                                slave->dev->name);
3069                         continue;
3070                 }
3071
3072 do_failover:
3073                 ASSERT_RTNL();
3074                 write_lock_bh(&bond->curr_slave_lock);
3075                 bond_select_active_slave(bond);
3076                 write_unlock_bh(&bond->curr_slave_lock);
3077         }
3078
3079         bond_set_carrier(bond);
3080 }
3081
3082 /*
3083  * Send ARP probes for active-backup mode ARP monitor.
3084  *
3085  * Called with bond->lock held for read.
3086  */
3087 static void bond_ab_arp_probe(struct bonding *bond)
3088 {
3089         struct slave *slave;
3090         int i;
3091
3092         read_lock(&bond->curr_slave_lock);
3093
3094         if (bond->current_arp_slave && bond->curr_active_slave)
3095                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3096                         bond->current_arp_slave->dev->name,
3097                         bond->curr_active_slave->dev->name);
3098
3099         if (bond->curr_active_slave) {
3100                 bond_arp_send_all(bond, bond->curr_active_slave);
3101                 read_unlock(&bond->curr_slave_lock);
3102                 return;
3103         }
3104
3105         read_unlock(&bond->curr_slave_lock);
3106
3107         /* if we don't have a curr_active_slave, search for the next available
3108          * backup slave from the current_arp_slave and make it the candidate
3109          * for becoming the curr_active_slave
3110          */
3111
3112         if (!bond->current_arp_slave) {
3113                 bond->current_arp_slave = bond->first_slave;
3114                 if (!bond->current_arp_slave)
3115                         return;
3116         }
3117
3118         bond_set_slave_inactive_flags(bond->current_arp_slave);
3119
3120         /* search for next candidate */
3121         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3122                 if (IS_UP(slave->dev)) {
3123                         slave->link = BOND_LINK_BACK;
3124                         bond_set_slave_active_flags(slave);
3125                         bond_arp_send_all(bond, slave);
3126                         slave->jiffies = jiffies;
3127                         bond->current_arp_slave = slave;
3128                         break;
3129                 }
3130
3131                 /* if the link state is up at this point, we
3132                  * mark it down - this can happen if we have
3133                  * simultaneous link failures and
3134                  * reselect_active_interface doesn't make this
3135                  * one the current slave so it is still marked
3136                  * up when it is actually down
3137                  */
3138                 if (slave->link == BOND_LINK_UP) {
3139                         slave->link = BOND_LINK_DOWN;
3140                         if (slave->link_failure_count < UINT_MAX)
3141                                 slave->link_failure_count++;
3142
3143                         bond_set_slave_inactive_flags(slave);
3144
3145                         pr_info("%s: backup interface %s is now down.\n",
3146                                 bond->dev->name, slave->dev->name);
3147                 }
3148         }
3149 }
3150
3151 void bond_activebackup_arp_mon(struct work_struct *work)
3152 {
3153         struct bonding *bond = container_of(work, struct bonding,
3154                                             arp_work.work);
3155         int delta_in_ticks;
3156
3157         read_lock(&bond->lock);
3158
3159         if (bond->kill_timers)
3160                 goto out;
3161
3162         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3163
3164         if (bond->slave_cnt == 0)
3165                 goto re_arm;
3166
3167         if (bond->send_grat_arp) {
3168                 read_lock(&bond->curr_slave_lock);
3169                 bond_send_gratuitous_arp(bond);
3170                 read_unlock(&bond->curr_slave_lock);
3171         }
3172
3173         if (bond->send_unsol_na) {
3174                 read_lock(&bond->curr_slave_lock);
3175                 bond_send_unsolicited_na(bond);
3176                 read_unlock(&bond->curr_slave_lock);
3177         }
3178
3179         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3180                 read_unlock(&bond->lock);
3181                 rtnl_lock();
3182                 read_lock(&bond->lock);
3183
3184                 bond_ab_arp_commit(bond, delta_in_ticks);
3185
3186                 read_unlock(&bond->lock);
3187                 rtnl_unlock();
3188                 read_lock(&bond->lock);
3189         }
3190
3191         bond_ab_arp_probe(bond);
3192
3193 re_arm:
3194         if (bond->params.arp_interval)
3195                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3196 out:
3197         read_unlock(&bond->lock);
3198 }
3199
3200 /*------------------------------ proc/seq_file-------------------------------*/
3201
3202 #ifdef CONFIG_PROC_FS
3203
3204 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3205         __acquires(&dev_base_lock)
3206         __acquires(&bond->lock)
3207 {
3208         struct bonding *bond = seq->private;
3209         loff_t off = 0;
3210         struct slave *slave;
3211         int i;
3212
3213         /* make sure the bond won't be taken away */
3214         read_lock(&dev_base_lock);
3215         read_lock(&bond->lock);
3216
3217         if (*pos == 0)
3218                 return SEQ_START_TOKEN;
3219
3220         bond_for_each_slave(bond, slave, i) {
3221                 if (++off == *pos)
3222                         return slave;
3223         }
3224
3225         return NULL;
3226 }
3227
3228 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3229 {
3230         struct bonding *bond = seq->private;
3231         struct slave *slave = v;
3232
3233         ++*pos;
3234         if (v == SEQ_START_TOKEN)
3235                 return bond->first_slave;
3236
3237         slave = slave->next;
3238
3239         return (slave == bond->first_slave) ? NULL : slave;
3240 }
3241
3242 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3243         __releases(&bond->lock)
3244         __releases(&dev_base_lock)
3245 {
3246         struct bonding *bond = seq->private;
3247
3248         read_unlock(&bond->lock);
3249         read_unlock(&dev_base_lock);
3250 }
3251
3252 static void bond_info_show_master(struct seq_file *seq)
3253 {
3254         struct bonding *bond = seq->private;
3255         struct slave *curr;
3256         int i;
3257
3258         read_lock(&bond->curr_slave_lock);
3259         curr = bond->curr_active_slave;
3260         read_unlock(&bond->curr_slave_lock);
3261
3262         seq_printf(seq, "Bonding Mode: %s",
3263                    bond_mode_name(bond->params.mode));
3264
3265         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3266             bond->params.fail_over_mac)
3267                 seq_printf(seq, " (fail_over_mac %s)",
3268                    fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3269
3270         seq_printf(seq, "\n");
3271
3272         if (bond->params.mode == BOND_MODE_XOR ||
3273                 bond->params.mode == BOND_MODE_8023AD) {
3274                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3275                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3276                         bond->params.xmit_policy);
3277         }
3278
3279         if (USES_PRIMARY(bond->params.mode)) {
3280                 seq_printf(seq, "Primary Slave: %s",
3281                            (bond->primary_slave) ?
3282                            bond->primary_slave->dev->name : "None");
3283                 if (bond->primary_slave)
3284                         seq_printf(seq, " (primary_reselect %s)",
3285                    pri_reselect_tbl[bond->params.primary_reselect].modename);
3286
3287                 seq_printf(seq, "\nCurrently Active Slave: %s\n",
3288                            (curr) ? curr->dev->name : "None");
3289         }
3290
3291         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3292                    "up" : "down");
3293         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3294         seq_printf(seq, "Up Delay (ms): %d\n",
3295                    bond->params.updelay * bond->params.miimon);
3296         seq_printf(seq, "Down Delay (ms): %d\n",
3297                    bond->params.downdelay * bond->params.miimon);
3298
3299
3300         /* ARP information */
3301         if (bond->params.arp_interval > 0) {
3302                 int printed = 0;
3303                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3304                                 bond->params.arp_interval);
3305
3306                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3307
3308                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
3309                         if (!bond->params.arp_targets[i])
3310                                 break;
3311                         if (printed)
3312                                 seq_printf(seq, ",");
3313                         seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3314                         printed = 1;
3315                 }
3316                 seq_printf(seq, "\n");
3317         }
3318
3319         if (bond->params.mode == BOND_MODE_8023AD) {
3320                 struct ad_info ad_info;
3321
3322                 seq_puts(seq, "\n802.3ad info\n");
3323                 seq_printf(seq, "LACP rate: %s\n",
3324                            (bond->params.lacp_fast) ? "fast" : "slow");
3325                 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3326                            ad_select_tbl[bond->params.ad_select].modename);
3327
3328                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3329                         seq_printf(seq, "bond %s has no active aggregator\n",
3330                                    bond->dev->name);
3331                 } else {
3332                         seq_printf(seq, "Active Aggregator Info:\n");
3333
3334                         seq_printf(seq, "\tAggregator ID: %d\n",
3335                                    ad_info.aggregator_id);
3336                         seq_printf(seq, "\tNumber of ports: %d\n",
3337                                    ad_info.ports);
3338                         seq_printf(seq, "\tActor Key: %d\n",
3339                                    ad_info.actor_key);
3340                         seq_printf(seq, "\tPartner Key: %d\n",
3341                                    ad_info.partner_key);
3342                         seq_printf(seq, "\tPartner Mac Address: %pM\n",
3343                                    ad_info.partner_system);
3344                 }
3345         }
3346 }
3347
3348 static void bond_info_show_slave(struct seq_file *seq,
3349                                  const struct slave *slave)
3350 {
3351         struct bonding *bond = seq->private;
3352
3353         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3354         seq_printf(seq, "MII Status: %s\n",
3355                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3356         seq_printf(seq, "Speed: %d Mbps\n", slave->speed);
3357         seq_printf(seq, "Duplex: %s\n", slave->duplex ? "full" : "half");
3358         seq_printf(seq, "Link Failure Count: %u\n",
3359                    slave->link_failure_count);
3360
3361         seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3362
3363         if (bond->params.mode == BOND_MODE_8023AD) {
3364                 const struct aggregator *agg
3365                         = SLAVE_AD_INFO(slave).port.aggregator;
3366
3367                 if (agg)
3368                         seq_printf(seq, "Aggregator ID: %d\n",
3369                                    agg->aggregator_identifier);
3370                 else
3371                         seq_puts(seq, "Aggregator ID: N/A\n");
3372         }
3373         seq_printf(seq, "Slave queue ID: %d\n", slave->queue_id);
3374 }
3375
3376 static int bond_info_seq_show(struct seq_file *seq, void *v)
3377 {
3378         if (v == SEQ_START_TOKEN) {
3379                 seq_printf(seq, "%s\n", version);
3380                 bond_info_show_master(seq);
3381         } else
3382                 bond_info_show_slave(seq, v);
3383
3384         return 0;
3385 }
3386
3387 static const struct seq_operations bond_info_seq_ops = {
3388         .start = bond_info_seq_start,
3389         .next  = bond_info_seq_next,
3390         .stop  = bond_info_seq_stop,
3391         .show  = bond_info_seq_show,
3392 };
3393
3394 static int bond_info_open(struct inode *inode, struct file *file)
3395 {
3396         struct seq_file *seq;
3397         struct proc_dir_entry *proc;
3398         int res;
3399
3400         res = seq_open(file, &bond_info_seq_ops);
3401         if (!res) {
3402                 /* recover the pointer buried in proc_dir_entry data */
3403                 seq = file->private_data;
3404                 proc = PDE(inode);
3405                 seq->private = proc->data;
3406         }
3407
3408         return res;
3409 }
3410
3411 static const struct file_operations bond_info_fops = {
3412         .owner   = THIS_MODULE,
3413         .open    = bond_info_open,
3414         .read    = seq_read,
3415         .llseek  = seq_lseek,
3416         .release = seq_release,
3417 };
3418
3419 static void bond_create_proc_entry(struct bonding *bond)
3420 {
3421         struct net_device *bond_dev = bond->dev;
3422         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3423
3424         if (bn->proc_dir) {
3425                 bond->proc_entry = proc_create_data(bond_dev->name,
3426                                                     S_IRUGO, bn->proc_dir,
3427                                                     &bond_info_fops, bond);
3428                 if (bond->proc_entry == NULL)
3429                         pr_warning("Warning: Cannot create /proc/net/%s/%s\n",
3430                                    DRV_NAME, bond_dev->name);
3431                 else
3432                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3433         }
3434 }
3435
3436 static void bond_remove_proc_entry(struct bonding *bond)
3437 {
3438         struct net_device *bond_dev = bond->dev;
3439         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3440
3441         if (bn->proc_dir && bond->proc_entry) {
3442                 remove_proc_entry(bond->proc_file_name, bn->proc_dir);
3443                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3444                 bond->proc_entry = NULL;
3445         }
3446 }
3447
3448 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3449  * Caller must hold rtnl_lock.
3450  */
3451 static void __net_init bond_create_proc_dir(struct bond_net *bn)
3452 {
3453         if (!bn->proc_dir) {
3454                 bn->proc_dir = proc_mkdir(DRV_NAME, bn->net->proc_net);
3455                 if (!bn->proc_dir)
3456                         pr_warning("Warning: cannot create /proc/net/%s\n",
3457                                    DRV_NAME);
3458         }
3459 }
3460
3461 /* Destroy the bonding directory under /proc/net, if empty.
3462  * Caller must hold rtnl_lock.
3463  */
3464 static void __net_exit bond_destroy_proc_dir(struct bond_net *bn)
3465 {
3466         if (bn->proc_dir) {
3467                 remove_proc_entry(DRV_NAME, bn->net->proc_net);
3468                 bn->proc_dir = NULL;
3469         }
3470 }
3471
3472 #else /* !CONFIG_PROC_FS */
3473
3474 static void bond_create_proc_entry(struct bonding *bond)
3475 {
3476 }
3477
3478 static void bond_remove_proc_entry(struct bonding *bond)
3479 {
3480 }
3481
3482 static inline void bond_create_proc_dir(struct bond_net *bn)
3483 {
3484 }
3485
3486 static inline void bond_destroy_proc_dir(struct bond_net *bn)
3487 {
3488 }
3489
3490 #endif /* CONFIG_PROC_FS */
3491
3492
3493 /*-------------------------- netdev event handling --------------------------*/
3494
3495 /*
3496  * Change device name
3497  */
3498 static int bond_event_changename(struct bonding *bond)
3499 {
3500         bond_remove_proc_entry(bond);
3501         bond_create_proc_entry(bond);
3502
3503         return NOTIFY_DONE;
3504 }
3505
3506 static int bond_master_netdev_event(unsigned long event,
3507                                     struct net_device *bond_dev)
3508 {
3509         struct bonding *event_bond = netdev_priv(bond_dev);
3510
3511         switch (event) {
3512         case NETDEV_CHANGENAME:
3513                 return bond_event_changename(event_bond);
3514         default:
3515                 break;
3516         }
3517
3518         return NOTIFY_DONE;
3519 }
3520
3521 static int bond_slave_netdev_event(unsigned long event,
3522                                    struct net_device *slave_dev)
3523 {
3524         struct net_device *bond_dev = slave_dev->master;
3525         struct bonding *bond = netdev_priv(bond_dev);
3526
3527         switch (event) {
3528         case NETDEV_UNREGISTER:
3529                 if (bond_dev) {
3530                         if (bond->setup_by_slave)
3531                                 bond_release_and_destroy(bond_dev, slave_dev);
3532                         else
3533                                 bond_release(bond_dev, slave_dev);
3534                 }
3535                 break;
3536         case NETDEV_CHANGE:
3537                 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3538                         struct slave *slave;
3539
3540                         slave = bond_get_slave_by_dev(bond, slave_dev);
3541                         if (slave) {
3542                                 u16 old_speed = slave->speed;
3543                                 u16 old_duplex = slave->duplex;
3544
3545                                 bond_update_speed_duplex(slave);
3546
3547                                 if (bond_is_lb(bond))
3548                                         break;
3549
3550                                 if (old_speed != slave->speed)
3551                                         bond_3ad_adapter_speed_changed(slave);
3552                                 if (old_duplex != slave->duplex)
3553                                         bond_3ad_adapter_duplex_changed(slave);
3554                         }
3555                 }
3556
3557                 break;
3558         case NETDEV_DOWN:
3559                 /*
3560                  * ... Or is it this?
3561                  */
3562                 break;
3563         case NETDEV_CHANGEMTU:
3564                 /*
3565                  * TODO: Should slaves be allowed to
3566                  * independently alter their MTU?  For
3567                  * an active-backup bond, slaves need
3568                  * not be the same type of device, so
3569                  * MTUs may vary.  For other modes,
3570                  * slaves arguably should have the
3571                  * same MTUs. To do this, we'd need to
3572                  * take over the slave's change_mtu
3573                  * function for the duration of their
3574                  * servitude.
3575                  */
3576                 break;
3577         case NETDEV_CHANGENAME:
3578                 /*
3579                  * TODO: handle changing the primary's name
3580                  */
3581                 break;
3582         case NETDEV_FEAT_CHANGE:
3583                 bond_compute_features(bond);
3584                 break;
3585         default:
3586                 break;
3587         }
3588
3589         return NOTIFY_DONE;
3590 }
3591
3592 /*
3593  * bond_netdev_event: handle netdev notifier chain events.
3594  *
3595  * This function receives events for the netdev chain.  The caller (an
3596  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3597  * locks for us to safely manipulate the slave devices (RTNL lock,
3598  * dev_probe_lock).
3599  */
3600 static int bond_netdev_event(struct notifier_block *this,
3601                              unsigned long event, void *ptr)
3602 {
3603         struct net_device *event_dev = (struct net_device *)ptr;
3604
3605         pr_debug("event_dev: %s, event: %lx\n",
3606                  event_dev ? event_dev->name : "None",
3607                  event);
3608
3609         if (!(event_dev->priv_flags & IFF_BONDING))
3610                 return NOTIFY_DONE;
3611
3612         if (event_dev->flags & IFF_MASTER) {
3613                 pr_debug("IFF_MASTER\n");
3614                 return bond_master_netdev_event(event, event_dev);
3615         }
3616
3617         if (event_dev->flags & IFF_SLAVE) {
3618                 pr_debug("IFF_SLAVE\n");
3619                 return bond_slave_netdev_event(event, event_dev);
3620         }
3621
3622         return NOTIFY_DONE;
3623 }
3624
3625 /*
3626  * bond_inetaddr_event: handle inetaddr notifier chain events.
3627  *
3628  * We keep track of device IPs primarily to use as source addresses in
3629  * ARP monitor probes (rather than spewing out broadcasts all the time).
3630  *
3631  * We track one IP for the main device (if it has one), plus one per VLAN.
3632  */
3633 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3634 {
3635         struct in_ifaddr *ifa = ptr;
3636         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3637         struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3638         struct bonding *bond;
3639         struct vlan_entry *vlan;
3640
3641         list_for_each_entry(bond, &bn->dev_list, bond_list) {
3642                 if (bond->dev == event_dev) {
3643                         switch (event) {
3644                         case NETDEV_UP:
3645                                 bond->master_ip = ifa->ifa_local;
3646                                 return NOTIFY_OK;
3647                         case NETDEV_DOWN:
3648                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3649                                 return NOTIFY_OK;
3650                         default:
3651                                 return NOTIFY_DONE;
3652                         }
3653                 }
3654
3655                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3656                         if (!bond->vlgrp)
3657                                 continue;
3658                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3659                         if (vlan_dev == event_dev) {
3660                                 switch (event) {
3661                                 case NETDEV_UP:
3662                                         vlan->vlan_ip = ifa->ifa_local;
3663                                         return NOTIFY_OK;
3664                                 case NETDEV_DOWN:
3665                                         vlan->vlan_ip =
3666                                                 bond_glean_dev_ip(vlan_dev);
3667                                         return NOTIFY_OK;
3668                                 default:
3669                                         return NOTIFY_DONE;
3670                                 }
3671                         }
3672                 }
3673         }
3674         return NOTIFY_DONE;
3675 }
3676
3677 static struct notifier_block bond_netdev_notifier = {
3678         .notifier_call = bond_netdev_event,
3679 };
3680
3681 static struct notifier_block bond_inetaddr_notifier = {
3682         .notifier_call = bond_inetaddr_event,
3683 };
3684
3685 /*-------------------------- Packet type handling ---------------------------*/
3686
3687 /* register to receive lacpdus on a bond */
3688 static void bond_register_lacpdu(struct bonding *bond)
3689 {
3690         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3691
3692         /* initialize packet type */
3693         pk_type->type = PKT_TYPE_LACPDU;
3694         pk_type->dev = bond->dev;
3695         pk_type->func = bond_3ad_lacpdu_recv;
3696
3697         dev_add_pack(pk_type);
3698 }
3699
3700 /* unregister to receive lacpdus on a bond */
3701 static void bond_unregister_lacpdu(struct bonding *bond)
3702 {
3703         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3704 }
3705
3706 void bond_register_arp(struct bonding *bond)
3707 {
3708         struct packet_type *pt = &bond->arp_mon_pt;
3709
3710         if (pt->type)
3711                 return;
3712
3713         pt->type = htons(ETH_P_ARP);
3714         pt->dev = bond->dev;
3715         pt->func = bond_arp_rcv;
3716         dev_add_pack(pt);
3717 }
3718
3719 void bond_unregister_arp(struct bonding *bond)
3720 {
3721         struct packet_type *pt = &bond->arp_mon_pt;
3722
3723         dev_remove_pack(pt);
3724         pt->type = 0;
3725 }
3726
3727 /*---------------------------- Hashing Policies -----------------------------*/
3728
3729 /*
3730  * Hash for the output device based upon layer 2 and layer 3 data. If
3731  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3732  */
3733 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3734 {
3735         struct ethhdr *data = (struct ethhdr *)skb->data;
3736         struct iphdr *iph = ip_hdr(skb);
3737
3738         if (skb->protocol == htons(ETH_P_IP)) {
3739                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3740                         (data->h_dest[5] ^ data->h_source[5])) % count;
3741         }
3742
3743         return (data->h_dest[5] ^ data->h_source[5]) % count;
3744 }
3745
3746 /*
3747  * Hash for the output device based upon layer 3 and layer 4 data. If
3748  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3749  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3750  */
3751 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3752 {
3753         struct ethhdr *data = (struct ethhdr *)skb->data;
3754         struct iphdr *iph = ip_hdr(skb);
3755         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3756         int layer4_xor = 0;
3757
3758         if (skb->protocol == htons(ETH_P_IP)) {
3759                 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3760                     (iph->protocol == IPPROTO_TCP ||
3761                      iph->protocol == IPPROTO_UDP)) {
3762                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3763                 }
3764                 return (layer4_xor ^
3765                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3766
3767         }
3768
3769         return (data->h_dest[5] ^ data->h_source[5]) % count;
3770 }
3771
3772 /*
3773  * Hash for the output device based upon layer 2 data
3774  */
3775 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3776 {
3777         struct ethhdr *data = (struct ethhdr *)skb->data;
3778
3779         return (data->h_dest[5] ^ data->h_source[5]) % count;
3780 }
3781
3782 /*-------------------------- Device entry points ----------------------------*/
3783
3784 static int bond_open(struct net_device *bond_dev)
3785 {
3786         struct bonding *bond = netdev_priv(bond_dev);
3787
3788         bond->kill_timers = 0;
3789
3790         INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3791
3792         if (bond_is_lb(bond)) {
3793                 /* bond_alb_initialize must be called before the timer
3794                  * is started.
3795                  */
3796                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3797                         /* something went wrong - fail the open operation */
3798                         return -ENOMEM;
3799                 }
3800
3801                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3802                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3803         }
3804
3805         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3806                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3807                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3808         }
3809
3810         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3811                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3812                         INIT_DELAYED_WORK(&bond->arp_work,
3813                                           bond_activebackup_arp_mon);
3814                 else
3815                         INIT_DELAYED_WORK(&bond->arp_work,
3816                                           bond_loadbalance_arp_mon);
3817
3818                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3819                 if (bond->params.arp_validate)
3820                         bond_register_arp(bond);
3821         }
3822
3823         if (bond->params.mode == BOND_MODE_8023AD) {
3824                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3825                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3826                 /* register to receive LACPDUs */
3827                 bond_register_lacpdu(bond);
3828                 bond_3ad_initiate_agg_selection(bond, 1);
3829         }
3830
3831         return 0;
3832 }
3833
3834 static int bond_close(struct net_device *bond_dev)
3835 {
3836         struct bonding *bond = netdev_priv(bond_dev);
3837
3838         if (bond->params.mode == BOND_MODE_8023AD) {
3839                 /* Unregister the receive of LACPDUs */
3840                 bond_unregister_lacpdu(bond);
3841         }
3842
3843         if (bond->params.arp_validate)
3844                 bond_unregister_arp(bond);
3845
3846         write_lock_bh(&bond->lock);
3847
3848         bond->send_grat_arp = 0;
3849         bond->send_unsol_na = 0;
3850
3851         /* signal timers not to re-arm */
3852         bond->kill_timers = 1;
3853
3854         write_unlock_bh(&bond->lock);
3855
3856         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3857                 cancel_delayed_work(&bond->mii_work);
3858         }
3859
3860         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3861                 cancel_delayed_work(&bond->arp_work);
3862         }
3863
3864         switch (bond->params.mode) {
3865         case BOND_MODE_8023AD:
3866                 cancel_delayed_work(&bond->ad_work);
3867                 break;
3868         case BOND_MODE_TLB:
3869         case BOND_MODE_ALB:
3870                 cancel_delayed_work(&bond->alb_work);
3871                 break;
3872         default:
3873                 break;
3874         }
3875
3876         if (delayed_work_pending(&bond->mcast_work))
3877                 cancel_delayed_work(&bond->mcast_work);
3878
3879         if (bond_is_lb(bond)) {
3880                 /* Must be called only after all
3881                  * slaves have been released
3882                  */
3883                 bond_alb_deinitialize(bond);
3884         }
3885
3886         return 0;
3887 }
3888
3889 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3890                                                 struct rtnl_link_stats64 *stats)
3891 {
3892         struct bonding *bond = netdev_priv(bond_dev);
3893         struct rtnl_link_stats64 temp;
3894         struct slave *slave;
3895         int i;
3896
3897         memset(stats, 0, sizeof(*stats));
3898
3899         read_lock_bh(&bond->lock);
3900
3901         bond_for_each_slave(bond, slave, i) {
3902                 const struct rtnl_link_stats64 *sstats =
3903                         dev_get_stats(slave->dev, &temp);
3904
3905                 stats->rx_packets += sstats->rx_packets;
3906                 stats->rx_bytes += sstats->rx_bytes;
3907                 stats->rx_errors += sstats->rx_errors;
3908                 stats->rx_dropped += sstats->rx_dropped;
3909
3910                 stats->tx_packets += sstats->tx_packets;
3911                 stats->tx_bytes += sstats->tx_bytes;
3912                 stats->tx_errors += sstats->tx_errors;
3913                 stats->tx_dropped += sstats->tx_dropped;
3914
3915                 stats->multicast += sstats->multicast;
3916                 stats->collisions += sstats->collisions;
3917
3918                 stats->rx_length_errors += sstats->rx_length_errors;
3919                 stats->rx_over_errors += sstats->rx_over_errors;
3920                 stats->rx_crc_errors += sstats->rx_crc_errors;
3921                 stats->rx_frame_errors += sstats->rx_frame_errors;
3922                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3923                 stats->rx_missed_errors += sstats->rx_missed_errors;
3924
3925                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3926                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3927                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3928                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3929                 stats->tx_window_errors += sstats->tx_window_errors;
3930         }
3931
3932         read_unlock_bh(&bond->lock);
3933
3934         return stats;
3935 }
3936
3937 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3938 {
3939         struct net_device *slave_dev = NULL;
3940         struct ifbond k_binfo;
3941         struct ifbond __user *u_binfo = NULL;
3942         struct ifslave k_sinfo;
3943         struct ifslave __user *u_sinfo = NULL;
3944         struct mii_ioctl_data *mii = NULL;
3945         int res = 0;
3946
3947         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3948
3949         switch (cmd) {
3950         case SIOCGMIIPHY:
3951                 mii = if_mii(ifr);
3952                 if (!mii)
3953                         return -EINVAL;
3954
3955                 mii->phy_id = 0;
3956                 /* Fall Through */
3957         case SIOCGMIIREG:
3958                 /*
3959                  * We do this again just in case we were called by SIOCGMIIREG
3960                  * instead of SIOCGMIIPHY.
3961                  */
3962                 mii = if_mii(ifr);
3963                 if (!mii)
3964                         return -EINVAL;
3965
3966
3967                 if (mii->reg_num == 1) {
3968                         struct bonding *bond = netdev_priv(bond_dev);
3969                         mii->val_out = 0;
3970                         read_lock(&bond->lock);
3971                         read_lock(&bond->curr_slave_lock);
3972                         if (netif_carrier_ok(bond->dev))
3973                                 mii->val_out = BMSR_LSTATUS;
3974
3975                         read_unlock(&bond->curr_slave_lock);
3976                         read_unlock(&bond->lock);
3977                 }
3978
3979                 return 0;
3980         case BOND_INFO_QUERY_OLD:
3981         case SIOCBONDINFOQUERY:
3982                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3983
3984                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3985                         return -EFAULT;
3986
3987                 res = bond_info_query(bond_dev, &k_binfo);
3988                 if (res == 0 &&
3989                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3990                         return -EFAULT;
3991
3992                 return res;
3993         case BOND_SLAVE_INFO_QUERY_OLD:
3994         case SIOCBONDSLAVEINFOQUERY:
3995                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3996
3997                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3998                         return -EFAULT;
3999
4000                 res = bond_slave_info_query(bond_dev, &k_sinfo);
4001                 if (res == 0 &&
4002                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
4003                         return -EFAULT;
4004
4005                 return res;
4006         default:
4007                 /* Go on */
4008                 break;
4009         }
4010
4011         if (!capable(CAP_NET_ADMIN))
4012                 return -EPERM;
4013
4014         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
4015
4016         pr_debug("slave_dev=%p:\n", slave_dev);
4017
4018         if (!slave_dev)
4019                 res = -ENODEV;
4020         else {
4021                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
4022                 switch (cmd) {
4023                 case BOND_ENSLAVE_OLD:
4024                 case SIOCBONDENSLAVE:
4025                         res = bond_enslave(bond_dev, slave_dev);
4026                         break;
4027                 case BOND_RELEASE_OLD:
4028                 case SIOCBONDRELEASE:
4029                         res = bond_release(bond_dev, slave_dev);
4030                         break;
4031                 case BOND_SETHWADDR_OLD:
4032                 case SIOCBONDSETHWADDR:
4033                         res = bond_sethwaddr(bond_dev, slave_dev);
4034                         break;
4035                 case BOND_CHANGE_ACTIVE_OLD:
4036                 case SIOCBONDCHANGEACTIVE:
4037                         res = bond_ioctl_change_active(bond_dev, slave_dev);
4038                         break;
4039                 default:
4040                         res = -EOPNOTSUPP;
4041                 }
4042
4043                 dev_put(slave_dev);
4044         }
4045
4046         return res;
4047 }
4048
4049 static bool bond_addr_in_mc_list(unsigned char *addr,
4050                                  struct netdev_hw_addr_list *list,
4051                                  int addrlen)
4052 {
4053         struct netdev_hw_addr *ha;
4054
4055         netdev_hw_addr_list_for_each(ha, list)
4056                 if (!memcmp(ha->addr, addr, addrlen))
4057                         return true;
4058
4059         return false;
4060 }
4061
4062 static void bond_set_multicast_list(struct net_device *bond_dev)
4063 {
4064         struct bonding *bond = netdev_priv(bond_dev);
4065         struct netdev_hw_addr *ha;
4066         bool found;
4067
4068         /*
4069          * Do promisc before checking multicast_mode
4070          */
4071         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
4072                 /*
4073                  * FIXME: Need to handle the error when one of the multi-slaves
4074                  * encounters error.
4075                  */
4076                 bond_set_promiscuity(bond, 1);
4077
4078
4079         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
4080                 bond_set_promiscuity(bond, -1);
4081
4082
4083         /* set allmulti flag to slaves */
4084         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
4085                 /*
4086                  * FIXME: Need to handle the error when one of the multi-slaves
4087                  * encounters error.
4088                  */
4089                 bond_set_allmulti(bond, 1);
4090
4091
4092         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
4093                 bond_set_allmulti(bond, -1);
4094
4095
4096         read_lock(&bond->lock);
4097
4098         bond->flags = bond_dev->flags;
4099
4100         /* looking for addresses to add to slaves' mc list */
4101         netdev_for_each_mc_addr(ha, bond_dev) {
4102                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
4103                                              bond_dev->addr_len);
4104                 if (!found)
4105                         bond_mc_add(bond, ha->addr);
4106         }
4107
4108         /* looking for addresses to delete from slaves' list */
4109         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
4110                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
4111                                              bond_dev->addr_len);
4112                 if (!found)
4113                         bond_mc_del(bond, ha->addr);
4114         }
4115
4116         /* save master's multicast list */
4117         __hw_addr_flush(&bond->mc_list);
4118         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
4119                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
4120
4121         read_unlock(&bond->lock);
4122 }
4123
4124 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
4125 {
4126         struct bonding *bond = netdev_priv(dev);
4127         struct slave *slave = bond->first_slave;
4128
4129         if (slave) {
4130                 const struct net_device_ops *slave_ops
4131                         = slave->dev->netdev_ops;
4132                 if (slave_ops->ndo_neigh_setup)
4133                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
4134         }
4135         return 0;
4136 }
4137
4138 /*
4139  * Change the MTU of all of a master's slaves to match the master
4140  */
4141 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4142 {
4143         struct bonding *bond = netdev_priv(bond_dev);
4144         struct slave *slave, *stop_at;
4145         int res = 0;
4146         int i;
4147
4148         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
4149                  (bond_dev ? bond_dev->name : "None"), new_mtu);
4150
4151         /* Can't hold bond->lock with bh disabled here since
4152          * some base drivers panic. On the other hand we can't
4153          * hold bond->lock without bh disabled because we'll
4154          * deadlock. The only solution is to rely on the fact
4155          * that we're under rtnl_lock here, and the slaves
4156          * list won't change. This doesn't solve the problem
4157          * of setting the slave's MTU while it is
4158          * transmitting, but the assumption is that the base
4159          * driver can handle that.
4160          *
4161          * TODO: figure out a way to safely iterate the slaves
4162          * list, but without holding a lock around the actual
4163          * call to the base driver.
4164          */
4165
4166         bond_for_each_slave(bond, slave, i) {
4167                 pr_debug("s %p s->p %p c_m %p\n",
4168                          slave,
4169                          slave->prev,
4170                          slave->dev->netdev_ops->ndo_change_mtu);
4171
4172                 res = dev_set_mtu(slave->dev, new_mtu);
4173
4174                 if (res) {
4175                         /* If we failed to set the slave's mtu to the new value
4176                          * we must abort the operation even in ACTIVE_BACKUP
4177                          * mode, because if we allow the backup slaves to have
4178                          * different mtu values than the active slave we'll
4179                          * need to change their mtu when doing a failover. That
4180                          * means changing their mtu from timer context, which
4181                          * is probably not a good idea.
4182                          */
4183                         pr_debug("err %d %s\n", res, slave->dev->name);
4184                         goto unwind;
4185                 }
4186         }
4187
4188         bond_dev->mtu = new_mtu;
4189
4190         return 0;
4191
4192 unwind:
4193         /* unwind from head to the slave that failed */
4194         stop_at = slave;
4195         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4196                 int tmp_res;
4197
4198                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4199                 if (tmp_res) {
4200                         pr_debug("unwind err %d dev %s\n",
4201                                  tmp_res, slave->dev->name);
4202                 }
4203         }
4204
4205         return res;
4206 }
4207
4208 /*
4209  * Change HW address
4210  *
4211  * Note that many devices must be down to change the HW address, and
4212  * downing the master releases all slaves.  We can make bonds full of
4213  * bonding devices to test this, however.
4214  */
4215 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4216 {
4217         struct bonding *bond = netdev_priv(bond_dev);
4218         struct sockaddr *sa = addr, tmp_sa;
4219         struct slave *slave, *stop_at;
4220         int res = 0;
4221         int i;
4222
4223         if (bond->params.mode == BOND_MODE_ALB)
4224                 return bond_alb_set_mac_address(bond_dev, addr);
4225
4226
4227         pr_debug("bond=%p, name=%s\n",
4228                  bond, bond_dev ? bond_dev->name : "None");
4229
4230         /*
4231          * If fail_over_mac is set to active, do nothing and return
4232          * success.  Returning an error causes ifenslave to fail.
4233          */
4234         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4235                 return 0;
4236
4237         if (!is_valid_ether_addr(sa->sa_data))
4238                 return -EADDRNOTAVAIL;
4239
4240         /* Can't hold bond->lock with bh disabled here since
4241          * some base drivers panic. On the other hand we can't
4242          * hold bond->lock without bh disabled because we'll
4243          * deadlock. The only solution is to rely on the fact
4244          * that we're under rtnl_lock here, and the slaves
4245          * list won't change. This doesn't solve the problem
4246          * of setting the slave's hw address while it is
4247          * transmitting, but the assumption is that the base
4248          * driver can handle that.
4249          *
4250          * TODO: figure out a way to safely iterate the slaves
4251          * list, but without holding a lock around the actual
4252          * call to the base driver.
4253          */
4254
4255         bond_for_each_slave(bond, slave, i) {
4256                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4257                 pr_debug("slave %p %s\n", slave, slave->dev->name);
4258
4259                 if (slave_ops->ndo_set_mac_address == NULL) {
4260                         res = -EOPNOTSUPP;
4261                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4262                         goto unwind;
4263                 }
4264
4265                 res = dev_set_mac_address(slave->dev, addr);
4266                 if (res) {
4267                         /* TODO: consider downing the slave
4268                          * and retry ?
4269                          * User should expect communications
4270                          * breakage anyway until ARP finish
4271                          * updating, so...
4272                          */
4273                         pr_debug("err %d %s\n", res, slave->dev->name);
4274                         goto unwind;
4275                 }
4276         }
4277
4278         /* success */
4279         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4280         return 0;
4281
4282 unwind:
4283         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4284         tmp_sa.sa_family = bond_dev->type;
4285
4286         /* unwind from head to the slave that failed */
4287         stop_at = slave;
4288         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4289                 int tmp_res;
4290
4291                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4292                 if (tmp_res) {
4293                         pr_debug("unwind err %d dev %s\n",
4294                                  tmp_res, slave->dev->name);
4295                 }
4296         }
4297
4298         return res;
4299 }
4300
4301 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4302 {
4303         struct bonding *bond = netdev_priv(bond_dev);
4304         struct slave *slave, *start_at;
4305         int i, slave_no, res = 1;
4306         struct iphdr *iph = ip_hdr(skb);
4307
4308         read_lock(&bond->lock);
4309
4310         if (!BOND_IS_OK(bond))
4311                 goto out;
4312         /*
4313          * Start with the curr_active_slave that joined the bond as the
4314          * default for sending IGMP traffic.  For failover purposes one
4315          * needs to maintain some consistency for the interface that will
4316          * send the join/membership reports.  The curr_active_slave found
4317          * will send all of this type of traffic.
4318          */
4319         if ((iph->protocol == IPPROTO_IGMP) &&
4320             (skb->protocol == htons(ETH_P_IP))) {
4321
4322                 read_lock(&bond->curr_slave_lock);
4323                 slave = bond->curr_active_slave;
4324                 read_unlock(&bond->curr_slave_lock);
4325
4326                 if (!slave)
4327                         goto out;
4328         } else {
4329                 /*
4330                  * Concurrent TX may collide on rr_tx_counter; we accept
4331                  * that as being rare enough not to justify using an
4332                  * atomic op here.
4333                  */
4334                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4335
4336                 bond_for_each_slave(bond, slave, i) {
4337                         slave_no--;
4338                         if (slave_no < 0)
4339                                 break;
4340                 }
4341         }
4342
4343         start_at = slave;
4344         bond_for_each_slave_from(bond, slave, i, start_at) {
4345                 if (IS_UP(slave->dev) &&
4346                     (slave->link == BOND_LINK_UP) &&
4347                     (slave->state == BOND_STATE_ACTIVE)) {
4348                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4349                         break;
4350                 }
4351         }
4352
4353 out:
4354         if (res) {
4355                 /* no suitable interface, frame not sent */
4356                 dev_kfree_skb(skb);
4357         }
4358         read_unlock(&bond->lock);
4359         return NETDEV_TX_OK;
4360 }
4361
4362
4363 /*
4364  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4365  * the bond has a usable interface.
4366  */
4367 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4368 {
4369         struct bonding *bond = netdev_priv(bond_dev);
4370         int res = 1;
4371
4372         read_lock(&bond->lock);
4373         read_lock(&bond->curr_slave_lock);
4374
4375         if (!BOND_IS_OK(bond))
4376                 goto out;
4377
4378         if (!bond->curr_active_slave)
4379                 goto out;
4380
4381         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4382
4383 out:
4384         if (res)
4385                 /* no suitable interface, frame not sent */
4386                 dev_kfree_skb(skb);
4387
4388         read_unlock(&bond->curr_slave_lock);
4389         read_unlock(&bond->lock);
4390         return NETDEV_TX_OK;
4391 }
4392
4393 /*
4394  * In bond_xmit_xor() , we determine the output device by using a pre-
4395  * determined xmit_hash_policy(), If the selected device is not enabled,
4396  * find the next active slave.
4397  */
4398 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4399 {
4400         struct bonding *bond = netdev_priv(bond_dev);
4401         struct slave *slave, *start_at;
4402         int slave_no;
4403         int i;
4404         int res = 1;
4405
4406         read_lock(&bond->lock);
4407
4408         if (!BOND_IS_OK(bond))
4409                 goto out;
4410
4411         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4412
4413         bond_for_each_slave(bond, slave, i) {
4414                 slave_no--;
4415                 if (slave_no < 0)
4416                         break;
4417         }
4418
4419         start_at = slave;
4420
4421         bond_for_each_slave_from(bond, slave, i, start_at) {
4422                 if (IS_UP(slave->dev) &&
4423                     (slave->link == BOND_LINK_UP) &&
4424                     (slave->state == BOND_STATE_ACTIVE)) {
4425                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4426                         break;
4427                 }
4428         }
4429
4430 out:
4431         if (res) {
4432                 /* no suitable interface, frame not sent */
4433                 dev_kfree_skb(skb);
4434         }
4435         read_unlock(&bond->lock);
4436         return NETDEV_TX_OK;
4437 }
4438
4439 /*
4440  * in broadcast mode, we send everything to all usable interfaces.
4441  */
4442 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4443 {
4444         struct bonding *bond = netdev_priv(bond_dev);
4445         struct slave *slave, *start_at;
4446         struct net_device *tx_dev = NULL;
4447         int i;
4448         int res = 1;
4449
4450         read_lock(&bond->lock);
4451
4452         if (!BOND_IS_OK(bond))
4453                 goto out;
4454
4455         read_lock(&bond->curr_slave_lock);
4456         start_at = bond->curr_active_slave;
4457         read_unlock(&bond->curr_slave_lock);
4458
4459         if (!start_at)
4460                 goto out;
4461
4462         bond_for_each_slave_from(bond, slave, i, start_at) {
4463                 if (IS_UP(slave->dev) &&
4464                     (slave->link == BOND_LINK_UP) &&
4465                     (slave->state == BOND_STATE_ACTIVE)) {
4466                         if (tx_dev) {
4467                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4468                                 if (!skb2) {
4469                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4470                                                bond_dev->name);
4471                                         continue;
4472                                 }
4473
4474                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4475                                 if (res) {
4476                                         dev_kfree_skb(skb2);
4477                                         continue;
4478                                 }
4479                         }
4480                         tx_dev = slave->dev;
4481                 }
4482         }
4483
4484         if (tx_dev)
4485                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4486
4487 out:
4488         if (res)
4489                 /* no suitable interface, frame not sent */
4490                 dev_kfree_skb(skb);
4491
4492         /* frame sent to all suitable interfaces */
4493         read_unlock(&bond->lock);
4494         return NETDEV_TX_OK;
4495 }
4496
4497 /*------------------------- Device initialization ---------------------------*/
4498
4499 static void bond_set_xmit_hash_policy(struct bonding *bond)
4500 {
4501         switch (bond->params.xmit_policy) {
4502         case BOND_XMIT_POLICY_LAYER23:
4503                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4504                 break;
4505         case BOND_XMIT_POLICY_LAYER34:
4506                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4507                 break;
4508         case BOND_XMIT_POLICY_LAYER2:
4509         default:
4510                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4511                 break;
4512         }
4513 }
4514
4515 /*
4516  * Lookup the slave that corresponds to a qid
4517  */
4518 static inline int bond_slave_override(struct bonding *bond,
4519                                       struct sk_buff *skb)
4520 {
4521         int i, res = 1;
4522         struct slave *slave = NULL;
4523         struct slave *check_slave;
4524
4525         read_lock(&bond->lock);
4526
4527         if (!BOND_IS_OK(bond) || !skb->queue_mapping)
4528                 goto out;
4529
4530         /* Find out if any slaves have the same mapping as this skb. */
4531         bond_for_each_slave(bond, check_slave, i) {
4532                 if (check_slave->queue_id == skb->queue_mapping) {
4533                         slave = check_slave;
4534                         break;
4535                 }
4536         }
4537
4538         /* If the slave isn't UP, use default transmit policy. */
4539         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4540             (slave->link == BOND_LINK_UP)) {
4541                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4542         }
4543
4544 out:
4545         read_unlock(&bond->lock);
4546         return res;
4547 }
4548
4549 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4550 {
4551         /*
4552          * This helper function exists to help dev_pick_tx get the correct
4553          * destination queue.  Using a helper function skips the a call to
4554          * skb_tx_hash and will put the skbs in the queue we expect on their
4555          * way down to the bonding driver.
4556          */
4557         return skb->queue_mapping;
4558 }
4559
4560 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4561 {
4562         struct bonding *bond = netdev_priv(dev);
4563
4564         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4565                 if (!bond_slave_override(bond, skb))
4566                         return NETDEV_TX_OK;
4567         }
4568
4569         switch (bond->params.mode) {
4570         case BOND_MODE_ROUNDROBIN:
4571                 return bond_xmit_roundrobin(skb, dev);
4572         case BOND_MODE_ACTIVEBACKUP:
4573                 return bond_xmit_activebackup(skb, dev);
4574         case BOND_MODE_XOR:
4575                 return bond_xmit_xor(skb, dev);
4576         case BOND_MODE_BROADCAST:
4577                 return bond_xmit_broadcast(skb, dev);
4578         case BOND_MODE_8023AD:
4579                 return bond_3ad_xmit_xor(skb, dev);
4580         case BOND_MODE_ALB:
4581         case BOND_MODE_TLB:
4582                 return bond_alb_xmit(skb, dev);
4583         default:
4584                 /* Should never happen, mode already checked */
4585                 pr_err("%s: Error: Unknown bonding mode %d\n",
4586                        dev->name, bond->params.mode);
4587                 WARN_ON_ONCE(1);
4588                 dev_kfree_skb(skb);
4589                 return NETDEV_TX_OK;
4590         }
4591 }
4592
4593
4594 /*
4595  * set bond mode specific net device operations
4596  */
4597 void bond_set_mode_ops(struct bonding *bond, int mode)
4598 {
4599         struct net_device *bond_dev = bond->dev;
4600
4601         switch (mode) {
4602         case BOND_MODE_ROUNDROBIN:
4603                 break;
4604         case BOND_MODE_ACTIVEBACKUP:
4605                 break;
4606         case BOND_MODE_XOR:
4607                 bond_set_xmit_hash_policy(bond);
4608                 break;
4609         case BOND_MODE_BROADCAST:
4610                 break;
4611         case BOND_MODE_8023AD:
4612                 bond_set_master_3ad_flags(bond);
4613                 bond_set_xmit_hash_policy(bond);
4614                 break;
4615         case BOND_MODE_ALB:
4616                 bond_set_master_alb_flags(bond);
4617                 /* FALLTHRU */
4618         case BOND_MODE_TLB:
4619                 break;
4620         default:
4621                 /* Should never happen, mode already checked */
4622                 pr_err("%s: Error: Unknown bonding mode %d\n",
4623                        bond_dev->name, mode);
4624                 break;
4625         }
4626 }
4627
4628 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4629                                     struct ethtool_drvinfo *drvinfo)
4630 {
4631         strncpy(drvinfo->driver, DRV_NAME, 32);
4632         strncpy(drvinfo->version, DRV_VERSION, 32);
4633         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4634 }
4635
4636 static const struct ethtool_ops bond_ethtool_ops = {
4637         .get_drvinfo            = bond_ethtool_get_drvinfo,
4638         .get_link               = ethtool_op_get_link,
4639         .get_tx_csum            = ethtool_op_get_tx_csum,
4640         .get_sg                 = ethtool_op_get_sg,
4641         .get_tso                = ethtool_op_get_tso,
4642         .get_ufo                = ethtool_op_get_ufo,
4643         .get_flags              = ethtool_op_get_flags,
4644 };
4645
4646 static const struct net_device_ops bond_netdev_ops = {
4647         .ndo_init               = bond_init,
4648         .ndo_uninit             = bond_uninit,
4649         .ndo_open               = bond_open,
4650         .ndo_stop               = bond_close,
4651         .ndo_start_xmit         = bond_start_xmit,
4652         .ndo_select_queue       = bond_select_queue,
4653         .ndo_get_stats64        = bond_get_stats,
4654         .ndo_do_ioctl           = bond_do_ioctl,
4655         .ndo_set_multicast_list = bond_set_multicast_list,
4656         .ndo_change_mtu         = bond_change_mtu,
4657         .ndo_set_mac_address    = bond_set_mac_address,
4658         .ndo_neigh_setup        = bond_neigh_setup,
4659         .ndo_vlan_rx_register   = bond_vlan_rx_register,
4660         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4661         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4662 #ifdef CONFIG_NET_POLL_CONTROLLER
4663         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4664         .ndo_poll_controller    = bond_poll_controller,
4665 #endif
4666 };
4667
4668 static void bond_destructor(struct net_device *bond_dev)
4669 {
4670         struct bonding *bond = netdev_priv(bond_dev);
4671         if (bond->wq)
4672                 destroy_workqueue(bond->wq);
4673         free_netdev(bond_dev);
4674 }
4675
4676 static void bond_setup(struct net_device *bond_dev)
4677 {
4678         struct bonding *bond = netdev_priv(bond_dev);
4679
4680         /* initialize rwlocks */
4681         rwlock_init(&bond->lock);
4682         rwlock_init(&bond->curr_slave_lock);
4683
4684         bond->params = bonding_defaults;
4685
4686         /* Initialize pointers */
4687         bond->dev = bond_dev;
4688         INIT_LIST_HEAD(&bond->vlan_list);
4689
4690         /* Initialize the device entry points */
4691         ether_setup(bond_dev);
4692         bond_dev->netdev_ops = &bond_netdev_ops;
4693         bond_dev->ethtool_ops = &bond_ethtool_ops;
4694         bond_set_mode_ops(bond, bond->params.mode);
4695
4696         bond_dev->destructor = bond_destructor;
4697
4698         /* Initialize the device options */
4699         bond_dev->tx_queue_len = 0;
4700         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4701         bond_dev->priv_flags |= IFF_BONDING;
4702         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
4703
4704         if (bond->params.arp_interval)
4705                 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4706
4707         /* At first, we block adding VLANs. That's the only way to
4708          * prevent problems that occur when adding VLANs over an
4709          * empty bond. The block will be removed once non-challenged
4710          * slaves are enslaved.
4711          */
4712         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4713
4714         /* don't acquire bond device's netif_tx_lock when
4715          * transmitting */
4716         bond_dev->features |= NETIF_F_LLTX;
4717
4718         /* By default, we declare the bond to be fully
4719          * VLAN hardware accelerated capable. Special
4720          * care is taken in the various xmit functions
4721          * when there are slaves that are not hw accel
4722          * capable
4723          */
4724         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4725                                NETIF_F_HW_VLAN_RX |
4726                                NETIF_F_HW_VLAN_FILTER);
4727
4728         /* By default, we enable GRO on bonding devices.
4729          * Actual support requires lowlevel drivers are GRO ready.
4730          */
4731         bond_dev->features |= NETIF_F_GRO;
4732 }
4733
4734 static void bond_work_cancel_all(struct bonding *bond)
4735 {
4736         write_lock_bh(&bond->lock);
4737         bond->kill_timers = 1;
4738         write_unlock_bh(&bond->lock);
4739
4740         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4741                 cancel_delayed_work(&bond->mii_work);
4742
4743         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4744                 cancel_delayed_work(&bond->arp_work);
4745
4746         if (bond->params.mode == BOND_MODE_ALB &&
4747             delayed_work_pending(&bond->alb_work))
4748                 cancel_delayed_work(&bond->alb_work);
4749
4750         if (bond->params.mode == BOND_MODE_8023AD &&
4751             delayed_work_pending(&bond->ad_work))
4752                 cancel_delayed_work(&bond->ad_work);
4753
4754         if (delayed_work_pending(&bond->mcast_work))
4755                 cancel_delayed_work(&bond->mcast_work);
4756 }
4757
4758 /*
4759 * Destroy a bonding device.
4760 * Must be under rtnl_lock when this function is called.
4761 */
4762 static void bond_uninit(struct net_device *bond_dev)
4763 {
4764         struct bonding *bond = netdev_priv(bond_dev);
4765         struct vlan_entry *vlan, *tmp;
4766
4767         bond_netpoll_cleanup(bond_dev);
4768
4769         /* Release the bonded slaves */
4770         bond_release_all(bond_dev);
4771
4772         list_del(&bond->bond_list);
4773
4774         bond_work_cancel_all(bond);
4775
4776         bond_remove_proc_entry(bond);
4777
4778         __hw_addr_flush(&bond->mc_list);
4779
4780         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4781                 list_del(&vlan->vlan_list);
4782                 kfree(vlan);
4783         }
4784 }
4785
4786 /*------------------------- Module initialization ---------------------------*/
4787
4788 /*
4789  * Convert string input module parms.  Accept either the
4790  * number of the mode or its string name.  A bit complicated because
4791  * some mode names are substrings of other names, and calls from sysfs
4792  * may have whitespace in the name (trailing newlines, for example).
4793  */
4794 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4795 {
4796         int modeint = -1, i, rv;
4797         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4798
4799         for (p = (char *)buf; *p; p++)
4800                 if (!(isdigit(*p) || isspace(*p)))
4801                         break;
4802
4803         if (*p)
4804                 rv = sscanf(buf, "%20s", modestr);
4805         else
4806                 rv = sscanf(buf, "%d", &modeint);
4807
4808         if (!rv)
4809                 return -1;
4810
4811         for (i = 0; tbl[i].modename; i++) {
4812                 if (modeint == tbl[i].mode)
4813                         return tbl[i].mode;
4814                 if (strcmp(modestr, tbl[i].modename) == 0)
4815                         return tbl[i].mode;
4816         }
4817
4818         return -1;
4819 }
4820
4821 static int bond_check_params(struct bond_params *params)
4822 {
4823         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4824
4825         /*
4826          * Convert string parameters.
4827          */
4828         if (mode) {
4829                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4830                 if (bond_mode == -1) {
4831                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4832                                mode == NULL ? "NULL" : mode);
4833                         return -EINVAL;
4834                 }
4835         }
4836
4837         if (xmit_hash_policy) {
4838                 if ((bond_mode != BOND_MODE_XOR) &&
4839                     (bond_mode != BOND_MODE_8023AD)) {
4840                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4841                                bond_mode_name(bond_mode));
4842                 } else {
4843                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4844                                                         xmit_hashtype_tbl);
4845                         if (xmit_hashtype == -1) {
4846                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4847                                        xmit_hash_policy == NULL ? "NULL" :
4848                                        xmit_hash_policy);
4849                                 return -EINVAL;
4850                         }
4851                 }
4852         }
4853
4854         if (lacp_rate) {
4855                 if (bond_mode != BOND_MODE_8023AD) {
4856                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4857                                 bond_mode_name(bond_mode));
4858                 } else {
4859                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4860                         if (lacp_fast == -1) {
4861                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4862                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4863                                 return -EINVAL;
4864                         }
4865                 }
4866         }
4867
4868         if (ad_select) {
4869                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4870                 if (params->ad_select == -1) {
4871                         pr_err("Error: Invalid ad_select \"%s\"\n",
4872                                ad_select == NULL ? "NULL" : ad_select);
4873                         return -EINVAL;
4874                 }
4875
4876                 if (bond_mode != BOND_MODE_8023AD) {
4877                         pr_warning("ad_select param only affects 802.3ad mode\n");
4878                 }
4879         } else {
4880                 params->ad_select = BOND_AD_STABLE;
4881         }
4882
4883         if (max_bonds < 0) {
4884                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4885                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4886                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4887         }
4888
4889         if (miimon < 0) {
4890                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4891                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4892                 miimon = BOND_LINK_MON_INTERV;
4893         }
4894
4895         if (updelay < 0) {
4896                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4897                            updelay, INT_MAX);
4898                 updelay = 0;
4899         }
4900
4901         if (downdelay < 0) {
4902                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4903                            downdelay, INT_MAX);
4904                 downdelay = 0;
4905         }
4906
4907         if ((use_carrier != 0) && (use_carrier != 1)) {
4908                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4909                            use_carrier);
4910                 use_carrier = 1;
4911         }
4912
4913         if (num_grat_arp < 0 || num_grat_arp > 255) {
4914                 pr_warning("Warning: num_grat_arp (%d) not in range 0-255 so it was reset to 1\n",
4915                            num_grat_arp);
4916                 num_grat_arp = 1;
4917         }
4918
4919         if (num_unsol_na < 0 || num_unsol_na > 255) {
4920                 pr_warning("Warning: num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4921                            num_unsol_na);
4922                 num_unsol_na = 1;
4923         }
4924
4925         /* reset values for 802.3ad */
4926         if (bond_mode == BOND_MODE_8023AD) {
4927                 if (!miimon) {
4928                         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");
4929                         pr_warning("Forcing miimon to 100msec\n");
4930                         miimon = 100;
4931                 }
4932         }
4933
4934         if (tx_queues < 1 || tx_queues > 255) {
4935                 pr_warning("Warning: tx_queues (%d) should be between "
4936                            "1 and 255, resetting to %d\n",
4937                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4938                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4939         }
4940
4941         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4942                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4943                            "not of valid value (0/1), so it was set to "
4944                            "0\n", all_slaves_active);
4945                 all_slaves_active = 0;
4946         }
4947
4948         if (resend_igmp < 0 || resend_igmp > 255) {
4949                 pr_warning("Warning: resend_igmp (%d) should be between "
4950                            "0 and 255, resetting to %d\n",
4951                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4952                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4953         }
4954
4955         /* reset values for TLB/ALB */
4956         if ((bond_mode == BOND_MODE_TLB) ||
4957             (bond_mode == BOND_MODE_ALB)) {
4958                 if (!miimon) {
4959                         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");
4960                         pr_warning("Forcing miimon to 100msec\n");
4961                         miimon = 100;
4962                 }
4963         }
4964
4965         if (bond_mode == BOND_MODE_ALB) {
4966                 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",
4967                           updelay);
4968         }
4969
4970         if (!miimon) {
4971                 if (updelay || downdelay) {
4972                         /* just warn the user the up/down delay will have
4973                          * no effect since miimon is zero...
4974                          */
4975                         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",
4976                                    updelay, downdelay);
4977                 }
4978         } else {
4979                 /* don't allow arp monitoring */
4980                 if (arp_interval) {
4981                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4982                                    miimon, arp_interval);
4983                         arp_interval = 0;
4984                 }
4985
4986                 if ((updelay % miimon) != 0) {
4987                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4988                                    updelay, miimon,
4989                                    (updelay / miimon) * miimon);
4990                 }
4991
4992                 updelay /= miimon;
4993
4994                 if ((downdelay % miimon) != 0) {
4995                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4996                                    downdelay, miimon,
4997                                    (downdelay / miimon) * miimon);
4998                 }
4999
5000                 downdelay /= miimon;
5001         }
5002
5003         if (arp_interval < 0) {
5004                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
5005                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
5006                 arp_interval = BOND_LINK_ARP_INTERV;
5007         }
5008
5009         for (arp_ip_count = 0;
5010              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
5011              arp_ip_count++) {
5012                 /* not complete check, but should be good enough to
5013                    catch mistakes */
5014                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
5015                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
5016                                    arp_ip_target[arp_ip_count]);
5017                         arp_interval = 0;
5018                 } else {
5019                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
5020                         arp_target[arp_ip_count] = ip;
5021                 }
5022         }
5023
5024         if (arp_interval && !arp_ip_count) {
5025                 /* don't allow arping if no arp_ip_target given... */
5026                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
5027                            arp_interval);
5028                 arp_interval = 0;
5029         }
5030
5031         if (arp_validate) {
5032                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
5033                         pr_err("arp_validate only supported in active-backup mode\n");
5034                         return -EINVAL;
5035                 }
5036                 if (!arp_interval) {
5037                         pr_err("arp_validate requires arp_interval\n");
5038                         return -EINVAL;
5039                 }
5040
5041                 arp_validate_value = bond_parse_parm(arp_validate,
5042                                                      arp_validate_tbl);
5043                 if (arp_validate_value == -1) {
5044                         pr_err("Error: invalid arp_validate \"%s\"\n",
5045                                arp_validate == NULL ? "NULL" : arp_validate);
5046                         return -EINVAL;
5047                 }
5048         } else
5049                 arp_validate_value = 0;
5050
5051         if (miimon) {
5052                 pr_info("MII link monitoring set to %d ms\n", miimon);
5053         } else if (arp_interval) {
5054                 int i;
5055
5056                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5057                         arp_interval,
5058                         arp_validate_tbl[arp_validate_value].modename,
5059                         arp_ip_count);
5060
5061                 for (i = 0; i < arp_ip_count; i++)
5062                         pr_info(" %s", arp_ip_target[i]);
5063
5064                 pr_info("\n");
5065
5066         } else if (max_bonds) {
5067                 /* miimon and arp_interval not set, we need one so things
5068                  * work as expected, see bonding.txt for details
5069                  */
5070                 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");
5071         }
5072
5073         if (primary && !USES_PRIMARY(bond_mode)) {
5074                 /* currently, using a primary only makes sense
5075                  * in active backup, TLB or ALB modes
5076                  */
5077                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
5078                            primary, bond_mode_name(bond_mode));
5079                 primary = NULL;
5080         }
5081
5082         if (primary && primary_reselect) {
5083                 primary_reselect_value = bond_parse_parm(primary_reselect,
5084                                                          pri_reselect_tbl);
5085                 if (primary_reselect_value == -1) {
5086                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
5087                                primary_reselect ==
5088                                         NULL ? "NULL" : primary_reselect);
5089                         return -EINVAL;
5090                 }
5091         } else {
5092                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5093         }
5094
5095         if (fail_over_mac) {
5096                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
5097                                                       fail_over_mac_tbl);
5098                 if (fail_over_mac_value == -1) {
5099                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
5100                                arp_validate == NULL ? "NULL" : arp_validate);
5101                         return -EINVAL;
5102                 }
5103
5104                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5105                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
5106         } else {
5107                 fail_over_mac_value = BOND_FOM_NONE;
5108         }
5109
5110         /* fill params struct with the proper values */
5111         params->mode = bond_mode;
5112         params->xmit_policy = xmit_hashtype;
5113         params->miimon = miimon;
5114         params->num_grat_arp = num_grat_arp;
5115         params->num_unsol_na = num_unsol_na;
5116         params->arp_interval = arp_interval;
5117         params->arp_validate = arp_validate_value;
5118         params->updelay = updelay;
5119         params->downdelay = downdelay;
5120         params->use_carrier = use_carrier;
5121         params->lacp_fast = lacp_fast;
5122         params->primary[0] = 0;
5123         params->primary_reselect = primary_reselect_value;
5124         params->fail_over_mac = fail_over_mac_value;
5125         params->tx_queues = tx_queues;
5126         params->all_slaves_active = all_slaves_active;
5127         params->resend_igmp = resend_igmp;
5128
5129         if (primary) {
5130                 strncpy(params->primary, primary, IFNAMSIZ);
5131                 params->primary[IFNAMSIZ - 1] = 0;
5132         }
5133
5134         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5135
5136         return 0;
5137 }
5138
5139 static struct lock_class_key bonding_netdev_xmit_lock_key;
5140 static struct lock_class_key bonding_netdev_addr_lock_key;
5141
5142 static void bond_set_lockdep_class_one(struct net_device *dev,
5143                                        struct netdev_queue *txq,
5144                                        void *_unused)
5145 {
5146         lockdep_set_class(&txq->_xmit_lock,
5147                           &bonding_netdev_xmit_lock_key);
5148 }
5149
5150 static void bond_set_lockdep_class(struct net_device *dev)
5151 {
5152         lockdep_set_class(&dev->addr_list_lock,
5153                           &bonding_netdev_addr_lock_key);
5154         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
5155 }
5156
5157 /*
5158  * Called from registration process
5159  */
5160 static int bond_init(struct net_device *bond_dev)
5161 {
5162         struct bonding *bond = netdev_priv(bond_dev);
5163         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5164
5165         pr_debug("Begin bond_init for %s\n", bond_dev->name);
5166
5167         bond->wq = create_singlethread_workqueue(bond_dev->name);
5168         if (!bond->wq)
5169                 return -ENOMEM;
5170
5171         bond_set_lockdep_class(bond_dev);
5172
5173         netif_carrier_off(bond_dev);
5174
5175         bond_create_proc_entry(bond);
5176         list_add_tail(&bond->bond_list, &bn->dev_list);
5177
5178         bond_prepare_sysfs_group(bond);
5179
5180         __hw_addr_init(&bond->mc_list);
5181         return 0;
5182 }
5183
5184 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
5185 {
5186         if (tb[IFLA_ADDRESS]) {
5187                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
5188                         return -EINVAL;
5189                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
5190                         return -EADDRNOTAVAIL;
5191         }
5192         return 0;
5193 }
5194
5195 static struct rtnl_link_ops bond_link_ops __read_mostly = {
5196         .kind           = "bond",
5197         .priv_size      = sizeof(struct bonding),
5198         .setup          = bond_setup,
5199         .validate       = bond_validate,
5200 };
5201
5202 /* Create a new bond based on the specified name and bonding parameters.
5203  * If name is NULL, obtain a suitable "bond%d" name for us.
5204  * Caller must NOT hold rtnl_lock; we need to release it here before we
5205  * set up our sysfs entries.
5206  */
5207 int bond_create(struct net *net, const char *name)
5208 {
5209         struct net_device *bond_dev;
5210         int res;
5211
5212         rtnl_lock();
5213
5214         bond_dev = alloc_netdev_mq(sizeof(struct bonding), name ? name : "",
5215                                 bond_setup, tx_queues);
5216         if (!bond_dev) {
5217                 pr_err("%s: eek! can't alloc netdev!\n", name);
5218                 rtnl_unlock();
5219                 return -ENOMEM;
5220         }
5221
5222         dev_net_set(bond_dev, net);
5223         bond_dev->rtnl_link_ops = &bond_link_ops;
5224
5225         if (!name) {
5226                 res = dev_alloc_name(bond_dev, "bond%d");
5227                 if (res < 0)
5228                         goto out;
5229         } else {
5230                 /*
5231                  * If we're given a name to register
5232                  * we need to ensure that its not already
5233                  * registered
5234                  */
5235                 res = -EEXIST;
5236                 if (__dev_get_by_name(net, name) != NULL)
5237                         goto out;
5238         }
5239
5240         res = register_netdevice(bond_dev);
5241
5242 out:
5243         rtnl_unlock();
5244         if (res < 0)
5245                 bond_destructor(bond_dev);
5246         return res;
5247 }
5248
5249 static int __net_init bond_net_init(struct net *net)
5250 {
5251         struct bond_net *bn = net_generic(net, bond_net_id);
5252
5253         bn->net = net;
5254         INIT_LIST_HEAD(&bn->dev_list);
5255
5256         bond_create_proc_dir(bn);
5257
5258         return 0;
5259 }
5260
5261 static void __net_exit bond_net_exit(struct net *net)
5262 {
5263         struct bond_net *bn = net_generic(net, bond_net_id);
5264
5265         bond_destroy_proc_dir(bn);
5266 }
5267
5268 static struct pernet_operations bond_net_ops = {
5269         .init = bond_net_init,
5270         .exit = bond_net_exit,
5271         .id   = &bond_net_id,
5272         .size = sizeof(struct bond_net),
5273 };
5274
5275 static int __init bonding_init(void)
5276 {
5277         int i;
5278         int res;
5279
5280         pr_info("%s", version);
5281
5282         res = bond_check_params(&bonding_defaults);
5283         if (res)
5284                 goto out;
5285
5286         res = register_pernet_subsys(&bond_net_ops);
5287         if (res)
5288                 goto out;
5289
5290         res = rtnl_link_register(&bond_link_ops);
5291         if (res)
5292                 goto err_link;
5293
5294         for (i = 0; i < max_bonds; i++) {
5295                 res = bond_create(&init_net, NULL);
5296                 if (res)
5297                         goto err;
5298         }
5299
5300         res = bond_create_sysfs();
5301         if (res)
5302                 goto err;
5303
5304         register_netdevice_notifier(&bond_netdev_notifier);
5305         register_inetaddr_notifier(&bond_inetaddr_notifier);
5306         bond_register_ipv6_notifier();
5307 out:
5308         return res;
5309 err:
5310         rtnl_link_unregister(&bond_link_ops);
5311 err_link:
5312         unregister_pernet_subsys(&bond_net_ops);
5313         goto out;
5314
5315 }
5316
5317 static void __exit bonding_exit(void)
5318 {
5319         unregister_netdevice_notifier(&bond_netdev_notifier);
5320         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5321         bond_unregister_ipv6_notifier();
5322
5323         bond_destroy_sysfs();
5324
5325         rtnl_link_unregister(&bond_link_ops);
5326         unregister_pernet_subsys(&bond_net_ops);
5327 }
5328
5329 module_init(bonding_init);
5330 module_exit(bonding_exit);
5331 MODULE_LICENSE("GPL");
5332 MODULE_VERSION(DRV_VERSION);
5333 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5334 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5335 MODULE_ALIAS_RTNL_LINK("bond");