Pileus Git - ~andy/linux/blob - drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 #define 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/inetdevice.h>
  63 #include <linux/igmp.h>
  64 #include <linux/etherdevice.h>
  65 #include <linux/skbuff.h>
  66 #include <net/sock.h>
  67 #include <linux/rtnetlink.h>
  68 #include <linux/smp.h>
  69 #include <linux/if_ether.h>
  70 #include <net/arp.h>
  71 #include <linux/mii.h>
  72 #include <linux/ethtool.h>
  73 #include <linux/if_vlan.h>
  74 #include <linux/if_bonding.h>
  75 #include <linux/jiffies.h>
  76 #include <linux/preempt.h>
  77 #include <net/route.h>
  78 #include <net/net_namespace.h>
  79 #include <net/netns/generic.h>
  80 #include "bonding.h"
  81 #include "bond_3ad.h"
  82 #include "bond_alb.h"
  83
  84 /*---------------------------- Module parameters ----------------------------*/
  85
  86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  87 #define BOND_LINK_MON_INTERV    0
  88 #define BOND_LINK_ARP_INTERV    0
  89
  90 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  91 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  92 static int num_peer_notif = 1;
  93 static int miimon       = BOND_LINK_MON_INTERV;
  94 static int updelay;
  95 static int downdelay;
  96 static int use_carrier  = 1;
  97 static char *mode;
  98 static char *primary;
  99 static char *primary_reselect;
 100 static char *lacp_rate;
 101 static char *ad_select;
 102 static char *xmit_hash_policy;
 103 static int arp_interval = BOND_LINK_ARP_INTERV;
 104 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 105 static char *arp_validate;
 106 static char *fail_over_mac;
 107 static int all_slaves_active = 0;
 108 static struct bond_params bonding_defaults;
 109 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 110
 111 module_param(max_bonds, int, 0);
 112 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 113 module_param(tx_queues, int, 0);
 114 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 115 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 116 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on failover event (alias of num_unsol_na)");
 117 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 118 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on failover event (alias of num_grat_arp)");
 119 module_param(miimon, int, 0);
 120 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 121 module_param(updelay, int, 0);
 122 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 123 module_param(downdelay, int, 0);
 124 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 125                             "in milliseconds");
 126 module_param(use_carrier, int, 0);
 127 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 128                               "0 for off, 1 for on (default)");
 129 module_param(mode, charp, 0);
 130 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 131                        "1 for active-backup, 2 for balance-xor, "
 132                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 133                        "6 for balance-alb");
 134 module_param(primary, charp, 0);
 135 MODULE_PARM_DESC(primary, "Primary network device to use");
 136 module_param(primary_reselect, charp, 0);
 137 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 138                                    "once it comes up; "
 139                                    "0 for always (default), "
 140                                    "1 for only if speed of primary is "
 141                                    "better, "
 142                                    "2 for only on active slave "
 143                                    "failure");
 144 module_param(lacp_rate, charp, 0);
 145 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 146                             "(slow/fast)");
 147 module_param(ad_select, charp, 0);
 148 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
 149 module_param(xmit_hash_policy, charp, 0);
 150 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 151                                    ", 1 for layer 3+4");
 152 module_param(arp_interval, int, 0);
 153 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 154 module_param_array(arp_ip_target, charp, NULL, 0);
 155 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 156 module_param(arp_validate, charp, 0);
 157 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 158 module_param(fail_over_mac, charp, 0);
 159 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
 160 module_param(all_slaves_active, int, 0);
 161 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 162                                      "by setting active flag for all slaves.  "
 163                                      "0 for never (default), 1 for always.");
 164 module_param(resend_igmp, int, 0);
 165 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on link failure");
 166
 167 /*----------------------------- Global variables ----------------------------*/
 168
 169 #ifdef CONFIG_NET_POLL_CONTROLLER
 170 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 171 #endif
 172
 173 int bond_net_id __read_mostly;
 174
 175 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 176 static int arp_ip_count;
 177 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 178 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 179 static int lacp_fast;
 180
 181 const struct bond_parm_tbl bond_lacp_tbl[] = {
 182 {       "slow",         AD_LACP_SLOW},
 183 {       "fast",         AD_LACP_FAST},
 184 {       NULL,           -1},
 185 };
 186
 187 const struct bond_parm_tbl bond_mode_tbl[] = {
 188 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 189 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 190 {       "balance-xor",          BOND_MODE_XOR},
 191 {       "broadcast",            BOND_MODE_BROADCAST},
 192 {       "802.3ad",              BOND_MODE_8023AD},
 193 {       "balance-tlb",          BOND_MODE_TLB},
 194 {       "balance-alb",          BOND_MODE_ALB},
 195 {       NULL,                   -1},
 196 };
 197
 198 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 199 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 200 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 201 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 202 {       NULL,                   -1},
 203 };
 204
 205 const struct bond_parm_tbl arp_validate_tbl[] = {
 206 {       "none",                 BOND_ARP_VALIDATE_NONE},
 207 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 208 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 209 {       "all",                  BOND_ARP_VALIDATE_ALL},
 210 {       NULL,                   -1},
 211 };
 212
 213 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 214 {       "none",                 BOND_FOM_NONE},
 215 {       "active",               BOND_FOM_ACTIVE},
 216 {       "follow",               BOND_FOM_FOLLOW},
 217 {       NULL,                   -1},
 218 };
 219
 220 const struct bond_parm_tbl pri_reselect_tbl[] = {
 221 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 222 {       "better",               BOND_PRI_RESELECT_BETTER},
 223 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 224 {       NULL,                   -1},
 225 };
 226
 227 struct bond_parm_tbl ad_select_tbl[] = {
 228 {       "stable",       BOND_AD_STABLE},
 229 {       "bandwidth",    BOND_AD_BANDWIDTH},
 230 {       "count",        BOND_AD_COUNT},
 231 {       NULL,           -1},
 232 };
 233
 234 /*-------------------------- Forward declarations ---------------------------*/
 235
 236 static int bond_init(struct net_device *bond_dev);
 237 static void bond_uninit(struct net_device *bond_dev);
 238
 239 /*---------------------------- General routines -----------------------------*/
 240
 241 const char *bond_mode_name(int mode)
 242 {
 243         static const char *names[] = {
 244                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 245                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 246                 [BOND_MODE_XOR] = "load balancing (xor)",
 247                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 248                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 249                 [BOND_MODE_TLB] = "transmit load balancing",
 250                 [BOND_MODE_ALB] = "adaptive load balancing",
 251         };
 252
 253         if (mode < 0 || mode > BOND_MODE_ALB)
 254                 return "unknown";
 255
 256         return names[mode];
 257 }
 258
 259 /*---------------------------------- VLAN -----------------------------------*/
 260
 261 /**
 262  * bond_add_vlan - add a new vlan id on bond
 263  * @bond: bond that got the notification
 264  * @vlan_id: the vlan id to add
 265  *
 266  * Returns -ENOMEM if allocation failed.
 267  */
 268 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 269 {
 270         struct vlan_entry *vlan;
 271
 272         pr_debug("bond: %s, vlan id %d\n",
 273                  (bond ? bond->dev->name : "None"), vlan_id);
 274
 275         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 276         if (!vlan)
 277                 return -ENOMEM;
 278
 279         INIT_LIST_HEAD(&vlan->vlan_list);
 280         vlan->vlan_id = vlan_id;
 281
 282         write_lock_bh(&bond->lock);
 283
 284         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 285
 286         write_unlock_bh(&bond->lock);
 287
 288         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 289
 290         return 0;
 291 }
 292
 293 /**
 294  * bond_del_vlan - delete a vlan id from bond
 295  * @bond: bond that got the notification
 296  * @vlan_id: the vlan id to delete
 297  *
 298  * returns -ENODEV if @vlan_id was not found in @bond.
 299  */
 300 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 301 {
 302         struct vlan_entry *vlan;
 303         int res = -ENODEV;
 304
 305         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 306
 307         block_netpoll_tx();
 308         write_lock_bh(&bond->lock);
 309
 310         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 311                 if (vlan->vlan_id == vlan_id) {
 312                         list_del(&vlan->vlan_list);
 313
 314                         if (bond_is_lb(bond))
 315                                 bond_alb_clear_vlan(bond, vlan_id);
 316
 317                         pr_debug("removed VLAN ID %d from bond %s\n",
 318                                  vlan_id, bond->dev->name);
 319
 320                         kfree(vlan);
 321
 322                         if (list_empty(&bond->vlan_list) &&
 323                             (bond->slave_cnt == 0)) {
 324                                 /* Last VLAN removed and no slaves, so
 325                                  * restore block on adding VLANs. This will
 326                                  * be removed once new slaves that are not
 327                                  * VLAN challenged will be added.
 328                                  */
 329                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 330                         }
 331
 332                         res = 0;
 333                         goto out;
 334                 }
 335         }
 336
 337         pr_debug("couldn't find VLAN ID %d in bond %s\n",
 338                  vlan_id, bond->dev->name);
 339
 340 out:
 341         write_unlock_bh(&bond->lock);
 342         unblock_netpoll_tx();
 343         return res;
 344 }
 345
 346 /**
 347  * bond_next_vlan - safely skip to the next item in the vlans list.
 348  * @bond: the bond we're working on
 349  * @curr: item we're advancing from
 350  *
 351  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 352  * or @curr->next otherwise (even if it is @curr itself again).
 353  *
 354  * Caller must hold bond->lock
 355  */
 356 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 357 {
 358         struct vlan_entry *next, *last;
 359
 360         if (list_empty(&bond->vlan_list))
 361                 return NULL;
 362
 363         if (!curr) {
 364                 next = list_entry(bond->vlan_list.next,
 365                                   struct vlan_entry, vlan_list);
 366         } else {
 367                 last = list_entry(bond->vlan_list.prev,
 368                                   struct vlan_entry, vlan_list);
 369                 if (last == curr) {
 370                         next = list_entry(bond->vlan_list.next,
 371                                           struct vlan_entry, vlan_list);
 372                 } else {
 373                         next = list_entry(curr->vlan_list.next,
 374                                           struct vlan_entry, vlan_list);
 375                 }
 376         }
 377
 378         return next;
 379 }
 380
 381 /**
 382  * bond_dev_queue_xmit - Prepare skb for xmit.
 383  *
 384  * @bond: bond device that got this skb for tx.
 385  * @skb: hw accel VLAN tagged skb to transmit
 386  * @slave_dev: slave that is supposed to xmit this skbuff
 387  */
 388 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 389                         struct net_device *slave_dev)
 390 {
 391         skb->dev = slave_dev;
 392         skb->priority = 1;
 393         if (unlikely(netpoll_tx_running(slave_dev)))
 394                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 395         else
 396                 dev_queue_xmit(skb);
 397
 398         return 0;
 399 }
 400
 401 /*
 402  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 403  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 404  * lock because:
 405  * a. This operation is performed in IOCTL context,
 406  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 407  * c. Holding a lock with BH disabled while directly calling a base driver
 408  *    entry point is generally a BAD idea.
 409  *
 410  * The design of synchronization/protection for this operation in the 8021q
 411  * module is good for one or more VLAN devices over a single physical device
 412  * and cannot be extended for a teaming solution like bonding, so there is a
 413  * potential race condition here where a net device from the vlan group might
 414  * be referenced (either by a base driver or the 8021q code) while it is being
 415  * removed from the system. However, it turns out we're not making matters
 416  * worse, and if it works for regular VLAN usage it will work here too.
 417 */
 418
 419 /**
 420  * bond_vlan_rx_register - Propagates registration to slaves
 421  * @bond_dev: bonding net device that got called
 422  * @grp: vlan group being registered
 423  */
 424 static void bond_vlan_rx_register(struct net_device *bond_dev,
 425                                   struct vlan_group *grp)
 426 {
 427         struct bonding *bond = netdev_priv(bond_dev);
 428         struct slave *slave;
 429         int i;
 430
 431         write_lock_bh(&bond->lock);
 432         bond->vlgrp = grp;
 433         write_unlock_bh(&bond->lock);
 434
 435         bond_for_each_slave(bond, slave, i) {
 436                 struct net_device *slave_dev = slave->dev;
 437                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 438
 439                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 440                     slave_ops->ndo_vlan_rx_register) {
 441                         slave_ops->ndo_vlan_rx_register(slave_dev, grp);
 442                 }
 443         }
 444 }
 445
 446 /**
 447  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 448  * @bond_dev: bonding net device that got called
 449  * @vid: vlan id being added
 450  */
 451 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 452 {
 453         struct bonding *bond = netdev_priv(bond_dev);
 454         struct slave *slave;
 455         int i, res;
 456
 457         bond_for_each_slave(bond, slave, i) {
 458                 struct net_device *slave_dev = slave->dev;
 459                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 460
 461                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 462                     slave_ops->ndo_vlan_rx_add_vid) {
 463                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
 464                 }
 465         }
 466
 467         res = bond_add_vlan(bond, vid);
 468         if (res) {
 469                 pr_err("%s: Error: Failed to add vlan id %d\n",
 470                        bond_dev->name, vid);
 471         }
 472 }
 473
 474 /**
 475  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 476  * @bond_dev: bonding net device that got called
 477  * @vid: vlan id being removed
 478  */
 479 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 480 {
 481         struct bonding *bond = netdev_priv(bond_dev);
 482         struct slave *slave;
 483         struct net_device *vlan_dev;
 484         int i, res;
 485
 486         bond_for_each_slave(bond, slave, i) {
 487                 struct net_device *slave_dev = slave->dev;
 488                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 489
 490                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 491                     slave_ops->ndo_vlan_rx_kill_vid) {
 492                         /* Save and then restore vlan_dev in the grp array,
 493                          * since the slave's driver might clear it.
 494                          */
 495                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
 496                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
 497                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
 498                 }
 499         }
 500
 501         res = bond_del_vlan(bond, vid);
 502         if (res) {
 503                 pr_err("%s: Error: Failed to remove vlan id %d\n",
 504                        bond_dev->name, vid);
 505         }
 506 }
 507
 508 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 509 {
 510         struct vlan_entry *vlan;
 511         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 512
 513         if (!bond->vlgrp)
 514                 return;
 515
 516         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 517             slave_ops->ndo_vlan_rx_register)
 518                 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
 519
 520         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 521             !(slave_ops->ndo_vlan_rx_add_vid))
 522                 return;
 523
 524         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
 525                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 526 }
 527
 528 static void bond_del_vlans_from_slave(struct bonding *bond,
 529                                       struct net_device *slave_dev)
 530 {
 531         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 532         struct vlan_entry *vlan;
 533         struct net_device *vlan_dev;
 534
 535         if (!bond->vlgrp)
 536                 return;
 537
 538         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 539             !(slave_ops->ndo_vlan_rx_kill_vid))
 540                 goto unreg;
 541
 542         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 543                 if (!vlan->vlan_id)
 544                         continue;
 545                 /* Save and then restore vlan_dev in the grp array,
 546                  * since the slave's driver might clear it.
 547                  */
 548                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
 549                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 550                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
 551         }
 552
 553 unreg:
 554         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 555             slave_ops->ndo_vlan_rx_register)
 556                 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
 557 }
 558
 559 /*------------------------------- Link status -------------------------------*/
 560
 561 /*
 562  * Set the carrier state for the master according to the state of its
 563  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 564  * do special 802.3ad magic.
 565  *
 566  * Returns zero if carrier state does not change, nonzero if it does.
 567  */
 568 static int bond_set_carrier(struct bonding *bond)
 569 {
 570         struct slave *slave;
 571         int i;
 572
 573         if (bond->slave_cnt == 0)
 574                 goto down;
 575
 576         if (bond->params.mode == BOND_MODE_8023AD)
 577                 return bond_3ad_set_carrier(bond);
 578
 579         bond_for_each_slave(bond, slave, i) {
 580                 if (slave->link == BOND_LINK_UP) {
 581                         if (!netif_carrier_ok(bond->dev)) {
 582                                 netif_carrier_on(bond->dev);
 583                                 return 1;
 584                         }
 585                         return 0;
 586                 }
 587         }
 588
 589 down:
 590         if (netif_carrier_ok(bond->dev)) {
 591                 netif_carrier_off(bond->dev);
 592                 return 1;
 593         }
 594         return 0;
 595 }
 596
 597 /*
 598  * Get link speed and duplex from the slave's base driver
 599  * using ethtool. If for some reason the call fails or the
 600  * values are invalid, fake speed and duplex to 100/Full
 601  * and return error.
 602  */
 603 static int bond_update_speed_duplex(struct slave *slave)
 604 {
 605         struct net_device *slave_dev = slave->dev;
 606         struct ethtool_cmd etool = { .cmd = ETHTOOL_GSET };
 607         u32 slave_speed;
 608         int res;
 609
 610         /* Fake speed and duplex */
 611         slave->speed = SPEED_100;
 612         slave->duplex = DUPLEX_FULL;
 613
 614         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
 615                 return -1;
 616
 617         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 618         if (res < 0)
 619                 return -1;
 620
 621         slave_speed = ethtool_cmd_speed(&etool);
 622         switch (slave_speed) {
 623         case SPEED_10:
 624         case SPEED_100:
 625         case SPEED_1000:
 626         case SPEED_10000:
 627                 break;
 628         default:
 629                 return -1;
 630         }
 631
 632         switch (etool.duplex) {
 633         case DUPLEX_FULL:
 634         case DUPLEX_HALF:
 635                 break;
 636         default:
 637                 return -1;
 638         }
 639
 640         slave->speed = slave_speed;
 641         slave->duplex = etool.duplex;
 642
 643         return 0;
 644 }
 645
 646 /*
 647  * if <dev> supports MII link status reporting, check its link status.
 648  *
 649  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 650  * depending upon the setting of the use_carrier parameter.
 651  *
 652  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 653  * can't tell and just pretend it is), or 0, meaning that the link is
 654  * down.
 655  *
 656  * If reporting is non-zero, instead of faking link up, return -1 if
 657  * both ETHTOOL and MII ioctls fail (meaning the device does not
 658  * support them).  If use_carrier is set, return whatever it says.
 659  * It'd be nice if there was a good way to tell if a driver supports
 660  * netif_carrier, but there really isn't.
 661  */
 662 static int bond_check_dev_link(struct bonding *bond,
 663                                struct net_device *slave_dev, int reporting)
 664 {
 665         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 666         int (*ioctl)(struct net_device *, struct ifreq *, int);
 667         struct ifreq ifr;
 668         struct mii_ioctl_data *mii;
 669
 670         if (!reporting && !netif_running(slave_dev))
 671                 return 0;
 672
 673         if (bond->params.use_carrier)
 674                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 675
 676         /* Try to get link status using Ethtool first. */
 677         if (slave_dev->ethtool_ops) {
 678                 if (slave_dev->ethtool_ops->get_link) {
 679                         u32 link;
 680
 681                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 682
 683                         return link ? BMSR_LSTATUS : 0;
 684                 }
 685         }
 686
 687         /* Ethtool can't be used, fallback to MII ioctls. */
 688         ioctl = slave_ops->ndo_do_ioctl;
 689         if (ioctl) {
 690                 /* TODO: set pointer to correct ioctl on a per team member */
 691                 /*       bases to make this more efficient. that is, once  */
 692                 /*       we determine the correct ioctl, we will always    */
 693                 /*       call it and not the others for that team          */
 694                 /*       member.                                           */
 695
 696                 /*
 697                  * We cannot assume that SIOCGMIIPHY will also read a
 698                  * register; not all network drivers (e.g., e100)
 699                  * support that.
 700                  */
 701
 702                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 703                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 704                 mii = if_mii(&ifr);
 705                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 706                         mii->reg_num = MII_BMSR;
 707                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 708                                 return mii->val_out & BMSR_LSTATUS;
 709                 }
 710         }
 711
 712         /*
 713          * If reporting, report that either there's no dev->do_ioctl,
 714          * or both SIOCGMIIREG and get_link failed (meaning that we
 715          * cannot report link status).  If not reporting, pretend
 716          * we're ok.
 717          */
 718         return reporting ? -1 : BMSR_LSTATUS;
 719 }
 720
 721 /*----------------------------- Multicast list ------------------------------*/
 722
 723 /*
 724  * Push the promiscuity flag down to appropriate slaves
 725  */
 726 static int bond_set_promiscuity(struct bonding *bond, int inc)
 727 {
 728         int err = 0;
 729         if (USES_PRIMARY(bond->params.mode)) {
 730                 /* write lock already acquired */
 731                 if (bond->curr_active_slave) {
 732                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 733                                                   inc);
 734                 }
 735         } else {
 736                 struct slave *slave;
 737                 int i;
 738                 bond_for_each_slave(bond, slave, i) {
 739                         err = dev_set_promiscuity(slave->dev, inc);
 740                         if (err)
 741                                 return err;
 742                 }
 743         }
 744         return err;
 745 }
 746
 747 /*
 748  * Push the allmulti flag down to all slaves
 749  */
 750 static int bond_set_allmulti(struct bonding *bond, int inc)
 751 {
 752         int err = 0;
 753         if (USES_PRIMARY(bond->params.mode)) {
 754                 /* write lock already acquired */
 755                 if (bond->curr_active_slave) {
 756                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 757                                                inc);
 758                 }
 759         } else {
 760                 struct slave *slave;
 761                 int i;
 762                 bond_for_each_slave(bond, slave, i) {
 763                         err = dev_set_allmulti(slave->dev, inc);
 764                         if (err)
 765                                 return err;
 766                 }
 767         }
 768         return err;
 769 }
 770
 771 /*
 772  * Add a Multicast address to slaves
 773  * according to mode
 774  */
 775 static void bond_mc_add(struct bonding *bond, void *addr)
 776 {
 777         if (USES_PRIMARY(bond->params.mode)) {
 778                 /* write lock already acquired */
 779                 if (bond->curr_active_slave)
 780                         dev_mc_add(bond->curr_active_slave->dev, addr);
 781         } else {
 782                 struct slave *slave;
 783                 int i;
 784
 785                 bond_for_each_slave(bond, slave, i)
 786                         dev_mc_add(slave->dev, addr);
 787         }
 788 }
 789
 790 /*
 791  * Remove a multicast address from slave
 792  * according to mode
 793  */
 794 static void bond_mc_del(struct bonding *bond, void *addr)
 795 {
 796         if (USES_PRIMARY(bond->params.mode)) {
 797                 /* write lock already acquired */
 798                 if (bond->curr_active_slave)
 799                         dev_mc_del(bond->curr_active_slave->dev, addr);
 800         } else {
 801                 struct slave *slave;
 802                 int i;
 803                 bond_for_each_slave(bond, slave, i) {
 804                         dev_mc_del(slave->dev, addr);
 805                 }
 806         }
 807 }
 808
 809
 810 static void __bond_resend_igmp_join_requests(struct net_device *dev)
 811 {
 812         struct in_device *in_dev;
 813
 814         rcu_read_lock();
 815         in_dev = __in_dev_get_rcu(dev);
 816         if (in_dev)
 817                 ip_mc_rejoin_groups(in_dev);
 818         rcu_read_unlock();
 819 }
 820
 821 /*
 822  * Retrieve the list of registered multicast addresses for the bonding
 823  * device and retransmit an IGMP JOIN request to the current active
 824  * slave.
 825  */
 826 static void bond_resend_igmp_join_requests(struct bonding *bond)
 827 {
 828         struct net_device *vlan_dev;
 829         struct vlan_entry *vlan;
 830
 831         read_lock(&bond->lock);
 832
 833         /* rejoin all groups on bond device */
 834         __bond_resend_igmp_join_requests(bond->dev);
 835
 836         /* rejoin all groups on vlan devices */
 837         if (bond->vlgrp) {
 838                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 839                         vlan_dev = vlan_group_get_device(bond->vlgrp,
 840                                                          vlan->vlan_id);
 841                         if (vlan_dev)
 842                                 __bond_resend_igmp_join_requests(vlan_dev);
 843                 }
 844         }
 845
 846         if (--bond->igmp_retrans > 0)
 847                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 848
 849         read_unlock(&bond->lock);
 850 }
 851
 852 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 853 {
 854         struct bonding *bond = container_of(work, struct bonding,
 855                                                         mcast_work.work);
 856         bond_resend_igmp_join_requests(bond);
 857 }
 858
 859 /*
 860  * flush all members of flush->mc_list from device dev->mc_list
 861  */
 862 static void bond_mc_list_flush(struct net_device *bond_dev,
 863                                struct net_device *slave_dev)
 864 {
 865         struct bonding *bond = netdev_priv(bond_dev);
 866         struct netdev_hw_addr *ha;
 867
 868         netdev_for_each_mc_addr(ha, bond_dev)
 869                 dev_mc_del(slave_dev, ha->addr);
 870
 871         if (bond->params.mode == BOND_MODE_8023AD) {
 872                 /* del lacpdu mc addr from mc list */
 873                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 874
 875                 dev_mc_del(slave_dev, lacpdu_multicast);
 876         }
 877 }
 878
 879 /*--------------------------- Active slave change ---------------------------*/
 880
 881 /*
 882  * Update the mc list and multicast-related flags for the new and
 883  * old active slaves (if any) according to the multicast mode, and
 884  * promiscuous flags unconditionally.
 885  */
 886 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
 887                          struct slave *old_active)
 888 {
 889         struct netdev_hw_addr *ha;
 890
 891         if (!USES_PRIMARY(bond->params.mode))
 892                 /* nothing to do -  mc list is already up-to-date on
 893                  * all slaves
 894                  */
 895                 return;
 896
 897         if (old_active) {
 898                 if (bond->dev->flags & IFF_PROMISC)
 899                         dev_set_promiscuity(old_active->dev, -1);
 900
 901                 if (bond->dev->flags & IFF_ALLMULTI)
 902                         dev_set_allmulti(old_active->dev, -1);
 903
 904                 netdev_for_each_mc_addr(ha, bond->dev)
 905                         dev_mc_del(old_active->dev, ha->addr);
 906         }
 907
 908         if (new_active) {
 909                 /* FIXME: Signal errors upstream. */
 910                 if (bond->dev->flags & IFF_PROMISC)
 911                         dev_set_promiscuity(new_active->dev, 1);
 912
 913                 if (bond->dev->flags & IFF_ALLMULTI)
 914                         dev_set_allmulti(new_active->dev, 1);
 915
 916                 netdev_for_each_mc_addr(ha, bond->dev)
 917                         dev_mc_add(new_active->dev, ha->addr);
 918         }
 919 }
 920
 921 /*
 922  * bond_do_fail_over_mac
 923  *
 924  * Perform special MAC address swapping for fail_over_mac settings
 925  *
 926  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 927  */
 928 static void bond_do_fail_over_mac(struct bonding *bond,
 929                                   struct slave *new_active,
 930                                   struct slave *old_active)
 931         __releases(&bond->curr_slave_lock)
 932         __releases(&bond->lock)
 933         __acquires(&bond->lock)
 934         __acquires(&bond->curr_slave_lock)
 935 {
 936         u8 tmp_mac[ETH_ALEN];
 937         struct sockaddr saddr;
 938         int rv;
 939
 940         switch (bond->params.fail_over_mac) {
 941         case BOND_FOM_ACTIVE:
 942                 if (new_active)
 943                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
 944                                new_active->dev->addr_len);
 945                 break;
 946         case BOND_FOM_FOLLOW:
 947                 /*
 948                  * if new_active && old_active, swap them
 949                  * if just old_active, do nothing (going to no active slave)
 950                  * if just new_active, set new_active to bond's MAC
 951                  */
 952                 if (!new_active)
 953                         return;
 954
 955                 write_unlock_bh(&bond->curr_slave_lock);
 956                 read_unlock(&bond->lock);
 957
 958                 if (old_active) {
 959                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 960                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 961                                ETH_ALEN);
 962                         saddr.sa_family = new_active->dev->type;
 963                 } else {
 964                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 965                         saddr.sa_family = bond->dev->type;
 966                 }
 967
 968                 rv = dev_set_mac_address(new_active->dev, &saddr);
 969                 if (rv) {
 970                         pr_err("%s: Error %d setting MAC of slave %s\n",
 971                                bond->dev->name, -rv, new_active->dev->name);
 972                         goto out;
 973                 }
 974
 975                 if (!old_active)
 976                         goto out;
 977
 978                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
 979                 saddr.sa_family = old_active->dev->type;
 980
 981                 rv = dev_set_mac_address(old_active->dev, &saddr);
 982                 if (rv)
 983                         pr_err("%s: Error %d setting MAC of slave %s\n",
 984                                bond->dev->name, -rv, new_active->dev->name);
 985 out:
 986                 read_lock(&bond->lock);
 987                 write_lock_bh(&bond->curr_slave_lock);
 988                 break;
 989         default:
 990                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
 991                        bond->dev->name, bond->params.fail_over_mac);
 992                 break;
 993         }
 994
 995 }
 996
 997 static bool bond_should_change_active(struct bonding *bond)
 998 {
 999         struct slave *prim = bond->primary_slave;
1000         struct slave *curr = bond->curr_active_slave;
1001
1002         if (!prim || !curr || curr->link != BOND_LINK_UP)
1003                 return true;
1004         if (bond->force_primary) {
1005                 bond->force_primary = false;
1006                 return true;
1007         }
1008         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
1009             (prim->speed < curr->speed ||
1010              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
1011                 return false;
1012         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
1013                 return false;
1014         return true;
1015 }
1016
1017 /**
1018  * find_best_interface - select the best available slave to be the active one
1019  * @bond: our bonding struct
1020  *
1021  * Warning: Caller must hold curr_slave_lock for writing.
1022  */
1023 static struct slave *bond_find_best_slave(struct bonding *bond)
1024 {
1025         struct slave *new_active, *old_active;
1026         struct slave *bestslave = NULL;
1027         int mintime = bond->params.updelay;
1028         int i;
1029
1030         new_active = bond->curr_active_slave;
1031
1032         if (!new_active) { /* there were no active slaves left */
1033                 if (bond->slave_cnt > 0)   /* found one slave */
1034                         new_active = bond->first_slave;
1035                 else
1036                         return NULL; /* still no slave, return NULL */
1037         }
1038
1039         if ((bond->primary_slave) &&
1040             bond->primary_slave->link == BOND_LINK_UP &&
1041             bond_should_change_active(bond)) {
1042                 new_active = bond->primary_slave;
1043         }
1044
1045         /* remember where to stop iterating over the slaves */
1046         old_active = new_active;
1047
1048         bond_for_each_slave_from(bond, new_active, i, old_active) {
1049                 if (new_active->link == BOND_LINK_UP) {
1050                         return new_active;
1051                 } else if (new_active->link == BOND_LINK_BACK &&
1052                            IS_UP(new_active->dev)) {
1053                         /* link up, but waiting for stabilization */
1054                         if (new_active->delay < mintime) {
1055                                 mintime = new_active->delay;
1056                                 bestslave = new_active;
1057                         }
1058                 }
1059         }
1060
1061         return bestslave;
1062 }
1063
1064 static bool bond_should_notify_peers(struct bonding *bond)
1065 {
1066         struct slave *slave = bond->curr_active_slave;
1067
1068         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1069                  bond->dev->name, slave ? slave->dev->name : "NULL");
1070
1071         if (!slave || !bond->send_peer_notif ||
1072             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1073                 return false;
1074
1075         bond->send_peer_notif--;
1076         return true;
1077 }
1078
1079 /**
1080  * change_active_interface - change the active slave into the specified one
1081  * @bond: our bonding struct
1082  * @new: the new slave to make the active one
1083  *
1084  * Set the new slave to the bond's settings and unset them on the old
1085  * curr_active_slave.
1086  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1087  *
1088  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1089  * because it is apparently the best available slave we have, even though its
1090  * updelay hasn't timed out yet.
1091  *
1092  * If new_active is not NULL, caller must hold bond->lock for read and
1093  * curr_slave_lock for write_bh.
1094  */
1095 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1096 {
1097         struct slave *old_active = bond->curr_active_slave;
1098
1099         if (old_active == new_active)
1100                 return;
1101
1102         if (new_active) {
1103                 new_active->jiffies = jiffies;
1104
1105                 if (new_active->link == BOND_LINK_BACK) {
1106                         if (USES_PRIMARY(bond->params.mode)) {
1107                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1108                                         bond->dev->name, new_active->dev->name,
1109                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1110                         }
1111
1112                         new_active->delay = 0;
1113                         new_active->link = BOND_LINK_UP;
1114
1115                         if (bond->params.mode == BOND_MODE_8023AD)
1116                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1117
1118                         if (bond_is_lb(bond))
1119                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1120                 } else {
1121                         if (USES_PRIMARY(bond->params.mode)) {
1122                                 pr_info("%s: making interface %s the new active one.\n",
1123                                         bond->dev->name, new_active->dev->name);
1124                         }
1125                 }
1126         }
1127
1128         if (USES_PRIMARY(bond->params.mode))
1129                 bond_mc_swap(bond, new_active, old_active);
1130
1131         if (bond_is_lb(bond)) {
1132                 bond_alb_handle_active_change(bond, new_active);
1133                 if (old_active)
1134                         bond_set_slave_inactive_flags(old_active);
1135                 if (new_active)
1136                         bond_set_slave_active_flags(new_active);
1137         } else {
1138                 bond->curr_active_slave = new_active;
1139         }
1140
1141         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1142                 if (old_active)
1143                         bond_set_slave_inactive_flags(old_active);
1144
1145                 if (new_active) {
1146                         bool should_notify_peers = false;
1147
1148                         bond_set_slave_active_flags(new_active);
1149
1150                         if (bond->params.fail_over_mac)
1151                                 bond_do_fail_over_mac(bond, new_active,
1152                                                       old_active);
1153
1154                         if (netif_running(bond->dev)) {
1155                                 bond->send_peer_notif =
1156                                         bond->params.num_peer_notif;
1157                                 should_notify_peers =
1158                                         bond_should_notify_peers(bond);
1159                         }
1160
1161                         write_unlock_bh(&bond->curr_slave_lock);
1162                         read_unlock(&bond->lock);
1163
1164                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1165                         if (should_notify_peers)
1166                                 netdev_bonding_change(bond->dev,
1167                                                       NETDEV_NOTIFY_PEERS);
1168
1169                         read_lock(&bond->lock);
1170                         write_lock_bh(&bond->curr_slave_lock);
1171                 }
1172         }
1173
1174         /* resend IGMP joins since active slave has changed or
1175          * all were sent on curr_active_slave */
1176         if (((USES_PRIMARY(bond->params.mode) && new_active) ||
1177              bond->params.mode == BOND_MODE_ROUNDROBIN) &&
1178             netif_running(bond->dev)) {
1179                 bond->igmp_retrans = bond->params.resend_igmp;
1180                 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1181         }
1182 }
1183
1184 /**
1185  * bond_select_active_slave - select a new active slave, if needed
1186  * @bond: our bonding struct
1187  *
1188  * This functions should be called when one of the following occurs:
1189  * - The old curr_active_slave has been released or lost its link.
1190  * - The primary_slave has got its link back.
1191  * - A slave has got its link back and there's no old curr_active_slave.
1192  *
1193  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1194  */
1195 void bond_select_active_slave(struct bonding *bond)
1196 {
1197         struct slave *best_slave;
1198         int rv;
1199
1200         best_slave = bond_find_best_slave(bond);
1201         if (best_slave != bond->curr_active_slave) {
1202                 bond_change_active_slave(bond, best_slave);
1203                 rv = bond_set_carrier(bond);
1204                 if (!rv)
1205                         return;
1206
1207                 if (netif_carrier_ok(bond->dev)) {
1208                         pr_info("%s: first active interface up!\n",
1209                                 bond->dev->name);
1210                 } else {
1211                         pr_info("%s: now running without any active interface !\n",
1212                                 bond->dev->name);
1213                 }
1214         }
1215 }
1216
1217 /*--------------------------- slave list handling ---------------------------*/
1218
1219 /*
1220  * This function attaches the slave to the end of list.
1221  *
1222  * bond->lock held for writing by caller.
1223  */
1224 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1225 {
1226         if (bond->first_slave == NULL) { /* attaching the first slave */
1227                 new_slave->next = new_slave;
1228                 new_slave->prev = new_slave;
1229                 bond->first_slave = new_slave;
1230         } else {
1231                 new_slave->next = bond->first_slave;
1232                 new_slave->prev = bond->first_slave->prev;
1233                 new_slave->next->prev = new_slave;
1234                 new_slave->prev->next = new_slave;
1235         }
1236
1237         bond->slave_cnt++;
1238 }
1239
1240 /*
1241  * This function detaches the slave from the list.
1242  * WARNING: no check is made to verify if the slave effectively
1243  * belongs to <bond>.
1244  * Nothing is freed on return, structures are just unchained.
1245  * If any slave pointer in bond was pointing to <slave>,
1246  * it should be changed by the calling function.
1247  *
1248  * bond->lock held for writing by caller.
1249  */
1250 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1251 {
1252         if (slave->next)
1253                 slave->next->prev = slave->prev;
1254
1255         if (slave->prev)
1256                 slave->prev->next = slave->next;
1257
1258         if (bond->first_slave == slave) { /* slave is the first slave */
1259                 if (bond->slave_cnt > 1) { /* there are more slave */
1260                         bond->first_slave = slave->next;
1261                 } else {
1262                         bond->first_slave = NULL; /* slave was the last one */
1263                 }
1264         }
1265
1266         slave->next = NULL;
1267         slave->prev = NULL;
1268         bond->slave_cnt--;
1269 }
1270
1271 #ifdef CONFIG_NET_POLL_CONTROLLER
1272 static inline int slave_enable_netpoll(struct slave *slave)
1273 {
1274         struct netpoll *np;
1275         int err = 0;
1276
1277         np = kzalloc(sizeof(*np), GFP_KERNEL);
1278         err = -ENOMEM;
1279         if (!np)
1280                 goto out;
1281
1282         np->dev = slave->dev;
1283         err = __netpoll_setup(np);
1284         if (err) {
1285                 kfree(np);
1286                 goto out;
1287         }
1288         slave->np = np;
1289 out:
1290         return err;
1291 }
1292 static inline void slave_disable_netpoll(struct slave *slave)
1293 {
1294         struct netpoll *np = slave->np;
1295
1296         if (!np)
1297                 return;
1298
1299         slave->np = NULL;
1300         synchronize_rcu_bh();
1301         __netpoll_cleanup(np);
1302         kfree(np);
1303 }
1304 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1305 {
1306         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1307                 return false;
1308         if (!slave_dev->netdev_ops->ndo_poll_controller)
1309                 return false;
1310         return true;
1311 }
1312
1313 static void bond_poll_controller(struct net_device *bond_dev)
1314 {
1315 }
1316
1317 static void __bond_netpoll_cleanup(struct bonding *bond)
1318 {
1319         struct slave *slave;
1320         int i;
1321
1322         bond_for_each_slave(bond, slave, i)
1323                 if (IS_UP(slave->dev))
1324                         slave_disable_netpoll(slave);
1325 }
1326 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1327 {
1328         struct bonding *bond = netdev_priv(bond_dev);
1329
1330         read_lock(&bond->lock);
1331         __bond_netpoll_cleanup(bond);
1332         read_unlock(&bond->lock);
1333 }
1334
1335 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1336 {
1337         struct bonding *bond = netdev_priv(dev);
1338         struct slave *slave;
1339         int i, err = 0;
1340
1341         read_lock(&bond->lock);
1342         bond_for_each_slave(bond, slave, i) {
1343                 err = slave_enable_netpoll(slave);
1344                 if (err) {
1345                         __bond_netpoll_cleanup(bond);
1346                         break;
1347                 }
1348         }
1349         read_unlock(&bond->lock);
1350         return err;
1351 }
1352
1353 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1354 {
1355         return bond->dev->npinfo;
1356 }
1357
1358 #else
1359 static inline int slave_enable_netpoll(struct slave *slave)
1360 {
1361         return 0;
1362 }
1363 static inline void slave_disable_netpoll(struct slave *slave)
1364 {
1365 }
1366 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1367 {
1368 }
1369 #endif
1370
1371 /*---------------------------------- IOCTL ----------------------------------*/
1372
1373 static int bond_sethwaddr(struct net_device *bond_dev,
1374                           struct net_device *slave_dev)
1375 {
1376         pr_debug("bond_dev=%p\n", bond_dev);
1377         pr_debug("slave_dev=%p\n", slave_dev);
1378         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1379         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1380         return 0;
1381 }
1382
1383 static u32 bond_fix_features(struct net_device *dev, u32 features)
1384 {
1385         struct slave *slave;
1386         struct bonding *bond = netdev_priv(dev);
1387         u32 mask;
1388         int i;
1389
1390         read_lock(&bond->lock);
1391
1392         if (!bond->first_slave) {
1393                 /* Disable adding VLANs to empty bond. But why? --mq */
1394                 features |= NETIF_F_VLAN_CHALLENGED;
1395                 goto out;
1396         }
1397
1398         mask = features;
1399         features &= ~NETIF_F_ONE_FOR_ALL;
1400         features |= NETIF_F_ALL_FOR_ALL;
1401
1402         bond_for_each_slave(bond, slave, i) {
1403                 features = netdev_increment_features(features,
1404                                                      slave->dev->features,
1405                                                      mask);
1406         }
1407
1408 out:
1409         read_unlock(&bond->lock);
1410         return features;
1411 }
1412
1413 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_TX_OFFLOADS | \
1414                                  NETIF_F_SOFT_FEATURES | \
1415                                  NETIF_F_LRO)
1416
1417 static void bond_compute_features(struct bonding *bond)
1418 {
1419         struct slave *slave;
1420         struct net_device *bond_dev = bond->dev;
1421         u32 vlan_features = BOND_VLAN_FEATURES;
1422         unsigned short max_hard_header_len = ETH_HLEN;
1423         int i;
1424
1425         read_lock(&bond->lock);
1426
1427         if (!bond->first_slave)
1428                 goto done;
1429
1430         bond_for_each_slave(bond, slave, i) {
1431                 vlan_features = netdev_increment_features(vlan_features,
1432                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1433
1434                 if (slave->dev->hard_header_len > max_hard_header_len)
1435                         max_hard_header_len = slave->dev->hard_header_len;
1436         }
1437
1438 done:
1439         bond_dev->vlan_features = vlan_features;
1440         bond_dev->hard_header_len = max_hard_header_len;
1441
1442         read_unlock(&bond->lock);
1443
1444         netdev_change_features(bond_dev);
1445 }
1446
1447 static void bond_setup_by_slave(struct net_device *bond_dev,
1448                                 struct net_device *slave_dev)
1449 {
1450         struct bonding *bond = netdev_priv(bond_dev);
1451
1452         bond_dev->header_ops        = slave_dev->header_ops;
1453
1454         bond_dev->type              = slave_dev->type;
1455         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1456         bond_dev->addr_len          = slave_dev->addr_len;
1457
1458         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1459                 slave_dev->addr_len);
1460         bond->setup_by_slave = 1;
1461 }
1462
1463 /* On bonding slaves other than the currently active slave, suppress
1464  * duplicates except for alb non-mcast/bcast.
1465  */
1466 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1467                                             struct slave *slave,
1468                                             struct bonding *bond)
1469 {
1470         if (bond_is_slave_inactive(slave)) {
1471                 if (bond->params.mode == BOND_MODE_ALB &&
1472                     skb->pkt_type != PACKET_BROADCAST &&
1473                     skb->pkt_type != PACKET_MULTICAST)
1474                         return false;
1475                 return true;
1476         }
1477         return false;
1478 }
1479
1480 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1481 {
1482         struct sk_buff *skb = *pskb;
1483         struct slave *slave;
1484         struct bonding *bond;
1485
1486         skb = skb_share_check(skb, GFP_ATOMIC);
1487         if (unlikely(!skb))
1488                 return RX_HANDLER_CONSUMED;
1489
1490         *pskb = skb;
1491
1492         slave = bond_slave_get_rcu(skb->dev);
1493         bond = slave->bond;
1494
1495         if (bond->params.arp_interval)
1496                 slave->dev->last_rx = jiffies;
1497
1498         if (bond->recv_probe) {
1499                 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1500
1501                 if (likely(nskb)) {
1502                         bond->recv_probe(nskb, bond, slave);
1503                         dev_kfree_skb(nskb);
1504                 }
1505         }
1506
1507         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1508                 return RX_HANDLER_EXACT;
1509         }
1510
1511         skb->dev = bond->dev;
1512
1513         if (bond->params.mode == BOND_MODE_ALB &&
1514             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1515             skb->pkt_type == PACKET_HOST) {
1516
1517                 if (unlikely(skb_cow_head(skb,
1518                                           skb->data - skb_mac_header(skb)))) {
1519                         kfree_skb(skb);
1520                         return RX_HANDLER_CONSUMED;
1521                 }
1522                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1523         }
1524
1525         return RX_HANDLER_ANOTHER;
1526 }
1527
1528 /* enslave device <slave> to bond device <master> */
1529 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1530 {
1531         struct bonding *bond = netdev_priv(bond_dev);
1532         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1533         struct slave *new_slave = NULL;
1534         struct netdev_hw_addr *ha;
1535         struct sockaddr addr;
1536         int link_reporting;
1537         int res = 0;
1538
1539         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1540                 slave_ops->ndo_do_ioctl == NULL) {
1541                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1542                            bond_dev->name, slave_dev->name);
1543         }
1544
1545         /* already enslaved */
1546         if (slave_dev->flags & IFF_SLAVE) {
1547                 pr_debug("Error, Device was already enslaved\n");
1548                 return -EBUSY;
1549         }
1550
1551         /* vlan challenged mutual exclusion */
1552         /* no need to lock since we're protected by rtnl_lock */
1553         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1554                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1555                 if (bond->vlgrp) {
1556                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1557                                bond_dev->name, slave_dev->name, bond_dev->name);
1558                         return -EPERM;
1559                 } else {
1560                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1561                                    bond_dev->name, slave_dev->name,
1562                                    slave_dev->name, bond_dev->name);
1563                 }
1564         } else {
1565                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1566         }
1567
1568         /*
1569          * Old ifenslave binaries are no longer supported.  These can
1570          * be identified with moderate accuracy by the state of the slave:
1571          * the current ifenslave will set the interface down prior to
1572          * enslaving it; the old ifenslave will not.
1573          */
1574         if ((slave_dev->flags & IFF_UP)) {
1575                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1576                        slave_dev->name);
1577                 res = -EPERM;
1578                 goto err_undo_flags;
1579         }
1580
1581         /* set bonding device ether type by slave - bonding netdevices are
1582          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1583          * there is a need to override some of the type dependent attribs/funcs.
1584          *
1585          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1586          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1587          */
1588         if (bond->slave_cnt == 0) {
1589                 if (bond_dev->type != slave_dev->type) {
1590                         pr_debug("%s: change device type from %d to %d\n",
1591                                  bond_dev->name,
1592                                  bond_dev->type, slave_dev->type);
1593
1594                         res = netdev_bonding_change(bond_dev,
1595                                                     NETDEV_PRE_TYPE_CHANGE);
1596                         res = notifier_to_errno(res);
1597                         if (res) {
1598                                 pr_err("%s: refused to change device type\n",
1599                                        bond_dev->name);
1600                                 res = -EBUSY;
1601                                 goto err_undo_flags;
1602                         }
1603
1604                         /* Flush unicast and multicast addresses */
1605                         dev_uc_flush(bond_dev);
1606                         dev_mc_flush(bond_dev);
1607
1608                         if (slave_dev->type != ARPHRD_ETHER)
1609                                 bond_setup_by_slave(bond_dev, slave_dev);
1610                         else
1611                                 ether_setup(bond_dev);
1612
1613                         netdev_bonding_change(bond_dev,
1614                                               NETDEV_POST_TYPE_CHANGE);
1615                 }
1616         } else if (bond_dev->type != slave_dev->type) {
1617                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1618                        slave_dev->name,
1619                        slave_dev->type, bond_dev->type);
1620                 res = -EINVAL;
1621                 goto err_undo_flags;
1622         }
1623
1624         if (slave_ops->ndo_set_mac_address == NULL) {
1625                 if (bond->slave_cnt == 0) {
1626                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1627                                    bond_dev->name);
1628                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1629                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1630                         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",
1631                                bond_dev->name);
1632                         res = -EOPNOTSUPP;
1633                         goto err_undo_flags;
1634                 }
1635         }
1636
1637         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1638
1639         /* If this is the first slave, then we need to set the master's hardware
1640          * address to be the same as the slave's. */
1641         if (is_zero_ether_addr(bond->dev->dev_addr))
1642                 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1643                        slave_dev->addr_len);
1644
1645
1646         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1647         if (!new_slave) {
1648                 res = -ENOMEM;
1649                 goto err_undo_flags;
1650         }
1651
1652         /*
1653          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1654          * is set via sysfs or module option if desired.
1655          */
1656         new_slave->queue_id = 0;
1657
1658         /* Save slave's original mtu and then set it to match the bond */
1659         new_slave->original_mtu = slave_dev->mtu;
1660         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1661         if (res) {
1662                 pr_debug("Error %d calling dev_set_mtu\n", res);
1663                 goto err_free;
1664         }
1665
1666         /*
1667          * Save slave's original ("permanent") mac address for modes
1668          * that need it, and for restoring it upon release, and then
1669          * set it to the master's address
1670          */
1671         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1672
1673         if (!bond->params.fail_over_mac) {
1674                 /*
1675                  * Set slave to master's mac address.  The application already
1676                  * set the master's mac address to that of the first slave
1677                  */
1678                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1679                 addr.sa_family = slave_dev->type;
1680                 res = dev_set_mac_address(slave_dev, &addr);
1681                 if (res) {
1682                         pr_debug("Error %d calling set_mac_address\n", res);
1683                         goto err_restore_mtu;
1684                 }
1685         }
1686
1687         res = netdev_set_bond_master(slave_dev, bond_dev);
1688         if (res) {
1689                 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1690                 goto err_restore_mac;
1691         }
1692
1693         /* open the slave since the application closed it */
1694         res = dev_open(slave_dev);
1695         if (res) {
1696                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1697                 goto err_unset_master;
1698         }
1699
1700         new_slave->bond = bond;
1701         new_slave->dev = slave_dev;
1702         slave_dev->priv_flags |= IFF_BONDING;
1703
1704         if (bond_is_lb(bond)) {
1705                 /* bond_alb_init_slave() must be called before all other stages since
1706                  * it might fail and we do not want to have to undo everything
1707                  */
1708                 res = bond_alb_init_slave(bond, new_slave);
1709                 if (res)
1710                         goto err_close;
1711         }
1712
1713         /* If the mode USES_PRIMARY, then the new slave gets the
1714          * master's promisc (and mc) settings only if it becomes the
1715          * curr_active_slave, and that is taken care of later when calling
1716          * bond_change_active()
1717          */
1718         if (!USES_PRIMARY(bond->params.mode)) {
1719                 /* set promiscuity level to new slave */
1720                 if (bond_dev->flags & IFF_PROMISC) {
1721                         res = dev_set_promiscuity(slave_dev, 1);
1722                         if (res)
1723                                 goto err_close;
1724                 }
1725
1726                 /* set allmulti level to new slave */
1727                 if (bond_dev->flags & IFF_ALLMULTI) {
1728                         res = dev_set_allmulti(slave_dev, 1);
1729                         if (res)
1730                                 goto err_close;
1731                 }
1732
1733                 netif_addr_lock_bh(bond_dev);
1734                 /* upload master's mc_list to new slave */
1735                 netdev_for_each_mc_addr(ha, bond_dev)
1736                         dev_mc_add(slave_dev, ha->addr);
1737                 netif_addr_unlock_bh(bond_dev);
1738         }
1739
1740         if (bond->params.mode == BOND_MODE_8023AD) {
1741                 /* add lacpdu mc addr to mc list */
1742                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1743
1744                 dev_mc_add(slave_dev, lacpdu_multicast);
1745         }
1746
1747         bond_add_vlans_on_slave(bond, slave_dev);
1748
1749         write_lock_bh(&bond->lock);
1750
1751         bond_attach_slave(bond, new_slave);
1752
1753         new_slave->delay = 0;
1754         new_slave->link_failure_count = 0;
1755
1756         write_unlock_bh(&bond->lock);
1757
1758         bond_compute_features(bond);
1759
1760         read_lock(&bond->lock);
1761
1762         new_slave->last_arp_rx = jiffies;
1763
1764         if (bond->params.miimon && !bond->params.use_carrier) {
1765                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1766
1767                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1768                         /*
1769                          * miimon is set but a bonded network driver
1770                          * does not support ETHTOOL/MII and
1771                          * arp_interval is not set.  Note: if
1772                          * use_carrier is enabled, we will never go
1773                          * here (because netif_carrier is always
1774                          * supported); thus, we don't need to change
1775                          * the messages for netif_carrier.
1776                          */
1777                         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",
1778                                bond_dev->name, slave_dev->name);
1779                 } else if (link_reporting == -1) {
1780                         /* unable get link status using mii/ethtool */
1781                         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",
1782                                    bond_dev->name, slave_dev->name);
1783                 }
1784         }
1785
1786         /* check for initial state */
1787         if (!bond->params.miimon ||
1788             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1789                 if (bond->params.updelay) {
1790                         pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1791                         new_slave->link  = BOND_LINK_BACK;
1792                         new_slave->delay = bond->params.updelay;
1793                 } else {
1794                         pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1795                         new_slave->link  = BOND_LINK_UP;
1796                 }
1797                 new_slave->jiffies = jiffies;
1798         } else {
1799                 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1800                 new_slave->link  = BOND_LINK_DOWN;
1801         }
1802
1803         if (bond_update_speed_duplex(new_slave) &&
1804             (new_slave->link != BOND_LINK_DOWN)) {
1805                 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n",
1806                            bond_dev->name, new_slave->dev->name);
1807
1808                 if (bond->params.mode == BOND_MODE_8023AD) {
1809                         pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n",
1810                                    bond_dev->name);
1811                 }
1812         }
1813
1814         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1815                 /* if there is a primary slave, remember it */
1816                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1817                         bond->primary_slave = new_slave;
1818                         bond->force_primary = true;
1819                 }
1820         }
1821
1822         write_lock_bh(&bond->curr_slave_lock);
1823
1824         switch (bond->params.mode) {
1825         case BOND_MODE_ACTIVEBACKUP:
1826                 bond_set_slave_inactive_flags(new_slave);
1827                 bond_select_active_slave(bond);
1828                 break;
1829         case BOND_MODE_8023AD:
1830                 /* in 802.3ad mode, the internal mechanism
1831                  * will activate the slaves in the selected
1832                  * aggregator
1833                  */
1834                 bond_set_slave_inactive_flags(new_slave);
1835                 /* if this is the first slave */
1836                 if (bond->slave_cnt == 1) {
1837                         SLAVE_AD_INFO(new_slave).id = 1;
1838                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1839                          * can be called only after the mac address of the bond is set
1840                          */
1841                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1842                                             bond->params.lacp_fast);
1843                 } else {
1844                         SLAVE_AD_INFO(new_slave).id =
1845                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1846                 }
1847
1848                 bond_3ad_bind_slave(new_slave);
1849                 break;
1850         case BOND_MODE_TLB:
1851         case BOND_MODE_ALB:
1852                 bond_set_active_slave(new_slave);
1853                 bond_set_slave_inactive_flags(new_slave);
1854                 bond_select_active_slave(bond);
1855                 break;
1856         default:
1857                 pr_debug("This slave is always active in trunk mode\n");
1858
1859                 /* always active in trunk mode */
1860                 bond_set_active_slave(new_slave);
1861
1862                 /* In trunking mode there is little meaning to curr_active_slave
1863                  * anyway (it holds no special properties of the bond device),
1864                  * so we can change it without calling change_active_interface()
1865                  */
1866                 if (!bond->curr_active_slave)
1867                         bond->curr_active_slave = new_slave;
1868
1869                 break;
1870         } /* switch(bond_mode) */
1871
1872         write_unlock_bh(&bond->curr_slave_lock);
1873
1874         bond_set_carrier(bond);
1875
1876 #ifdef CONFIG_NET_POLL_CONTROLLER
1877         slave_dev->npinfo = bond_netpoll_info(bond);
1878         if (slave_dev->npinfo) {
1879                 if (slave_enable_netpoll(new_slave)) {
1880                         read_unlock(&bond->lock);
1881                         pr_info("Error, %s: master_dev is using netpoll, "
1882                                  "but new slave device does not support netpoll.\n",
1883                                  bond_dev->name);
1884                         res = -EBUSY;
1885                         goto err_close;
1886                 }
1887         }
1888 #endif
1889
1890         read_unlock(&bond->lock);
1891
1892         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1893         if (res)
1894                 goto err_close;
1895
1896         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1897                                          new_slave);
1898         if (res) {
1899                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1900                 goto err_dest_symlinks;
1901         }
1902
1903         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1904                 bond_dev->name, slave_dev->name,
1905                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1906                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1907
1908         /* enslave is successful */
1909         return 0;
1910
1911 /* Undo stages on error */
1912 err_dest_symlinks:
1913         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1914
1915 err_close:
1916         dev_close(slave_dev);
1917
1918 err_unset_master:
1919         netdev_set_bond_master(slave_dev, NULL);
1920
1921 err_restore_mac:
1922         if (!bond->params.fail_over_mac) {
1923                 /* XXX TODO - fom follow mode needs to change master's
1924                  * MAC if this slave's MAC is in use by the bond, or at
1925                  * least print a warning.
1926                  */
1927                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1928                 addr.sa_family = slave_dev->type;
1929                 dev_set_mac_address(slave_dev, &addr);
1930         }
1931
1932 err_restore_mtu:
1933         dev_set_mtu(slave_dev, new_slave->original_mtu);
1934
1935 err_free:
1936         kfree(new_slave);
1937
1938 err_undo_flags:
1939         bond_compute_features(bond);
1940
1941         return res;
1942 }
1943
1944 /*
1945  * Try to release the slave device <slave> from the bond device <master>
1946  * It is legal to access curr_active_slave without a lock because all the function
1947  * is write-locked.
1948  *
1949  * The rules for slave state should be:
1950  *   for Active/Backup:
1951  *     Active stays on all backups go down
1952  *   for Bonded connections:
1953  *     The first up interface should be left on and all others downed.
1954  */
1955 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1956 {
1957         struct bonding *bond = netdev_priv(bond_dev);
1958         struct slave *slave, *oldcurrent;
1959         struct sockaddr addr;
1960         u32 old_features = bond_dev->features;
1961
1962         /* slave is not a slave or master is not master of this slave */
1963         if (!(slave_dev->flags & IFF_SLAVE) ||
1964             (slave_dev->master != bond_dev)) {
1965                 pr_err("%s: Error: cannot release %s.\n",
1966                        bond_dev->name, slave_dev->name);
1967                 return -EINVAL;
1968         }
1969
1970         block_netpoll_tx();
1971         netdev_bonding_change(bond_dev, NETDEV_RELEASE);
1972         write_lock_bh(&bond->lock);
1973
1974         slave = bond_get_slave_by_dev(bond, slave_dev);
1975         if (!slave) {
1976                 /* not a slave of this bond */
1977                 pr_info("%s: %s not enslaved\n",
1978                         bond_dev->name, slave_dev->name);
1979                 write_unlock_bh(&bond->lock);
1980                 unblock_netpoll_tx();
1981                 return -EINVAL;
1982         }
1983
1984         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1985          * for this slave anymore.
1986          */
1987         netdev_rx_handler_unregister(slave_dev);
1988         write_unlock_bh(&bond->lock);
1989         synchronize_net();
1990         write_lock_bh(&bond->lock);
1991
1992         if (!bond->params.fail_over_mac) {
1993                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1994                     bond->slave_cnt > 1)
1995                         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",
1996                                    bond_dev->name, slave_dev->name,
1997                                    slave->perm_hwaddr,
1998                                    bond_dev->name, slave_dev->name);
1999         }
2000
2001         /* Inform AD package of unbinding of slave. */
2002         if (bond->params.mode == BOND_MODE_8023AD) {
2003                 /* must be called before the slave is
2004                  * detached from the list
2005                  */
2006                 bond_3ad_unbind_slave(slave);
2007         }
2008
2009         pr_info("%s: releasing %s interface %s\n",
2010                 bond_dev->name,
2011                 bond_is_active_slave(slave) ? "active" : "backup",
2012                 slave_dev->name);
2013
2014         oldcurrent = bond->curr_active_slave;
2015
2016         bond->current_arp_slave = NULL;
2017
2018         /* release the slave from its bond */
2019         bond_detach_slave(bond, slave);
2020
2021         if (bond->primary_slave == slave)
2022                 bond->primary_slave = NULL;
2023
2024         if (oldcurrent == slave)
2025                 bond_change_active_slave(bond, NULL);
2026
2027         if (bond_is_lb(bond)) {
2028                 /* Must be called only after the slave has been
2029                  * detached from the list and the curr_active_slave
2030                  * has been cleared (if our_slave == old_current),
2031                  * but before a new active slave is selected.
2032                  */
2033                 write_unlock_bh(&bond->lock);
2034                 bond_alb_deinit_slave(bond, slave);
2035                 write_lock_bh(&bond->lock);
2036         }
2037
2038         if (oldcurrent == slave) {
2039                 /*
2040                  * Note that we hold RTNL over this sequence, so there
2041                  * is no concern that another slave add/remove event
2042                  * will interfere.
2043                  */
2044                 write_unlock_bh(&bond->lock);
2045                 read_lock(&bond->lock);
2046                 write_lock_bh(&bond->curr_slave_lock);
2047
2048                 bond_select_active_slave(bond);
2049
2050                 write_unlock_bh(&bond->curr_slave_lock);
2051                 read_unlock(&bond->lock);
2052                 write_lock_bh(&bond->lock);
2053         }
2054
2055         if (bond->slave_cnt == 0) {
2056                 bond_set_carrier(bond);
2057
2058                 /* if the last slave was removed, zero the mac address
2059                  * of the master so it will be set by the application
2060                  * to the mac address of the first slave
2061                  */
2062                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2063
2064                 if (bond->vlgrp) {
2065                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2066                                    bond_dev->name, bond_dev->name);
2067                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2068                                    bond_dev->name);
2069                 }
2070         }
2071
2072         write_unlock_bh(&bond->lock);
2073         unblock_netpoll_tx();
2074
2075         bond_compute_features(bond);
2076         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2077             (old_features & NETIF_F_VLAN_CHALLENGED))
2078                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2079                         bond_dev->name, slave_dev->name, bond_dev->name);
2080
2081         /* must do this from outside any spinlocks */
2082         bond_destroy_slave_symlinks(bond_dev, slave_dev);
2083
2084         bond_del_vlans_from_slave(bond, slave_dev);
2085
2086         /* If the mode USES_PRIMARY, then we should only remove its
2087          * promisc and mc settings if it was the curr_active_slave, but that was
2088          * already taken care of above when we detached the slave
2089          */
2090         if (!USES_PRIMARY(bond->params.mode)) {
2091                 /* unset promiscuity level from slave */
2092                 if (bond_dev->flags & IFF_PROMISC)
2093                         dev_set_promiscuity(slave_dev, -1);
2094
2095                 /* unset allmulti level from slave */
2096                 if (bond_dev->flags & IFF_ALLMULTI)
2097                         dev_set_allmulti(slave_dev, -1);
2098
2099                 /* flush master's mc_list from slave */
2100                 netif_addr_lock_bh(bond_dev);
2101                 bond_mc_list_flush(bond_dev, slave_dev);
2102                 netif_addr_unlock_bh(bond_dev);
2103         }
2104
2105         netdev_set_bond_master(slave_dev, NULL);
2106
2107         slave_disable_netpoll(slave);
2108
2109         /* close slave before restoring its mac address */
2110         dev_close(slave_dev);
2111
2112         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2113                 /* restore original ("permanent") mac address */
2114                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2115                 addr.sa_family = slave_dev->type;
2116                 dev_set_mac_address(slave_dev, &addr);
2117         }
2118
2119         dev_set_mtu(slave_dev, slave->original_mtu);
2120
2121         slave_dev->priv_flags &= ~IFF_BONDING;
2122
2123         kfree(slave);
2124
2125         return 0;  /* deletion OK */
2126 }
2127
2128 /*
2129 * First release a slave and then destroy the bond if no more slaves are left.
2130 * Must be under rtnl_lock when this function is called.
2131 */
2132 static int  bond_release_and_destroy(struct net_device *bond_dev,
2133                                      struct net_device *slave_dev)
2134 {
2135         struct bonding *bond = netdev_priv(bond_dev);
2136         int ret;
2137
2138         ret = bond_release(bond_dev, slave_dev);
2139         if ((ret == 0) && (bond->slave_cnt == 0)) {
2140                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2141                 pr_info("%s: destroying bond %s.\n",
2142                         bond_dev->name, bond_dev->name);
2143                 unregister_netdevice(bond_dev);
2144         }
2145         return ret;
2146 }
2147
2148 /*
2149  * This function releases all slaves.
2150  */
2151 static int bond_release_all(struct net_device *bond_dev)
2152 {
2153         struct bonding *bond = netdev_priv(bond_dev);
2154         struct slave *slave;
2155         struct net_device *slave_dev;
2156         struct sockaddr addr;
2157
2158         write_lock_bh(&bond->lock);
2159
2160         netif_carrier_off(bond_dev);
2161
2162         if (bond->slave_cnt == 0)
2163                 goto out;
2164
2165         bond->current_arp_slave = NULL;
2166         bond->primary_slave = NULL;
2167         bond_change_active_slave(bond, NULL);
2168
2169         while ((slave = bond->first_slave) != NULL) {
2170                 /* Inform AD package of unbinding of slave
2171                  * before slave is detached from the list.
2172                  */
2173                 if (bond->params.mode == BOND_MODE_8023AD)
2174                         bond_3ad_unbind_slave(slave);
2175
2176                 slave_dev = slave->dev;
2177                 bond_detach_slave(bond, slave);
2178
2179                 /* now that the slave is detached, unlock and perform
2180                  * all the undo steps that should not be called from
2181                  * within a lock.
2182                  */
2183                 write_unlock_bh(&bond->lock);
2184
2185                 /* unregister rx_handler early so bond_handle_frame wouldn't
2186                  * be called for this slave anymore.
2187                  */
2188                 netdev_rx_handler_unregister(slave_dev);
2189                 synchronize_net();
2190
2191                 if (bond_is_lb(bond)) {
2192                         /* must be called only after the slave
2193                          * has been detached from the list
2194                          */
2195                         bond_alb_deinit_slave(bond, slave);
2196                 }
2197
2198                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2199                 bond_del_vlans_from_slave(bond, slave_dev);
2200
2201                 /* If the mode USES_PRIMARY, then we should only remove its
2202                  * promisc and mc settings if it was the curr_active_slave, but that was
2203                  * already taken care of above when we detached the slave
2204                  */
2205                 if (!USES_PRIMARY(bond->params.mode)) {
2206                         /* unset promiscuity level from slave */
2207                         if (bond_dev->flags & IFF_PROMISC)
2208                                 dev_set_promiscuity(slave_dev, -1);
2209
2210                         /* unset allmulti level from slave */
2211                         if (bond_dev->flags & IFF_ALLMULTI)
2212                                 dev_set_allmulti(slave_dev, -1);
2213
2214                         /* flush master's mc_list from slave */
2215                         netif_addr_lock_bh(bond_dev);
2216                         bond_mc_list_flush(bond_dev, slave_dev);
2217                         netif_addr_unlock_bh(bond_dev);
2218                 }
2219
2220                 netdev_set_bond_master(slave_dev, NULL);
2221
2222                 slave_disable_netpoll(slave);
2223
2224                 /* close slave before restoring its mac address */
2225                 dev_close(slave_dev);
2226
2227                 if (!bond->params.fail_over_mac) {
2228                         /* restore original ("permanent") mac address*/
2229                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2230                         addr.sa_family = slave_dev->type;
2231                         dev_set_mac_address(slave_dev, &addr);
2232                 }
2233
2234                 kfree(slave);
2235
2236                 /* re-acquire the lock before getting the next slave */
2237                 write_lock_bh(&bond->lock);
2238         }
2239
2240         /* zero the mac address of the master so it will be
2241          * set by the application to the mac address of the
2242          * first slave
2243          */
2244         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2245
2246         if (bond->vlgrp) {
2247                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2248                            bond_dev->name, bond_dev->name);
2249                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2250                            bond_dev->name);
2251         }
2252
2253         pr_info("%s: released all slaves\n", bond_dev->name);
2254
2255 out:
2256         write_unlock_bh(&bond->lock);
2257
2258         bond_compute_features(bond);
2259
2260         return 0;
2261 }
2262
2263 /*
2264  * This function changes the active slave to slave <slave_dev>.
2265  * It returns -EINVAL in the following cases.
2266  *  - <slave_dev> is not found in the list.
2267  *  - There is not active slave now.
2268  *  - <slave_dev> is already active.
2269  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2270  *  - <slave_dev> is not running.
2271  * In these cases, this function does nothing.
2272  * In the other cases, current_slave pointer is changed and 0 is returned.
2273  */
2274 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2275 {
2276         struct bonding *bond = netdev_priv(bond_dev);
2277         struct slave *old_active = NULL;
2278         struct slave *new_active = NULL;
2279         int res = 0;
2280
2281         if (!USES_PRIMARY(bond->params.mode))
2282                 return -EINVAL;
2283
2284         /* Verify that master_dev is indeed the master of slave_dev */
2285         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2286                 return -EINVAL;
2287
2288         read_lock(&bond->lock);
2289
2290         read_lock(&bond->curr_slave_lock);
2291         old_active = bond->curr_active_slave;
2292         read_unlock(&bond->curr_slave_lock);
2293
2294         new_active = bond_get_slave_by_dev(bond, slave_dev);
2295
2296         /*
2297          * Changing to the current active: do nothing; return success.
2298          */
2299         if (new_active && (new_active == old_active)) {
2300                 read_unlock(&bond->lock);
2301                 return 0;
2302         }
2303
2304         if ((new_active) &&
2305             (old_active) &&
2306             (new_active->link == BOND_LINK_UP) &&
2307             IS_UP(new_active->dev)) {
2308                 block_netpoll_tx();
2309                 write_lock_bh(&bond->curr_slave_lock);
2310                 bond_change_active_slave(bond, new_active);
2311                 write_unlock_bh(&bond->curr_slave_lock);
2312                 unblock_netpoll_tx();
2313         } else
2314                 res = -EINVAL;
2315
2316         read_unlock(&bond->lock);
2317
2318         return res;
2319 }
2320
2321 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2322 {
2323         struct bonding *bond = netdev_priv(bond_dev);
2324
2325         info->bond_mode = bond->params.mode;
2326         info->miimon = bond->params.miimon;
2327
2328         read_lock(&bond->lock);
2329         info->num_slaves = bond->slave_cnt;
2330         read_unlock(&bond->lock);
2331
2332         return 0;
2333 }
2334
2335 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2336 {
2337         struct bonding *bond = netdev_priv(bond_dev);
2338         struct slave *slave;
2339         int i, res = -ENODEV;
2340
2341         read_lock(&bond->lock);
2342
2343         bond_for_each_slave(bond, slave, i) {
2344                 if (i == (int)info->slave_id) {
2345                         res = 0;
2346                         strcpy(info->slave_name, slave->dev->name);
2347                         info->link = slave->link;
2348                         info->state = bond_slave_state(slave);
2349                         info->link_failure_count = slave->link_failure_count;
2350                         break;
2351                 }
2352         }
2353
2354         read_unlock(&bond->lock);
2355
2356         return res;
2357 }
2358
2359 /*-------------------------------- Monitoring -------------------------------*/
2360
2361
2362 static int bond_miimon_inspect(struct bonding *bond)
2363 {
2364         struct slave *slave;
2365         int i, link_state, commit = 0;
2366         bool ignore_updelay;
2367
2368         ignore_updelay = !bond->curr_active_slave ? true : false;
2369
2370         bond_for_each_slave(bond, slave, i) {
2371                 slave->new_link = BOND_LINK_NOCHANGE;
2372
2373                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2374
2375                 switch (slave->link) {
2376                 case BOND_LINK_UP:
2377                         if (link_state)
2378                                 continue;
2379
2380                         slave->link = BOND_LINK_FAIL;
2381                         slave->delay = bond->params.downdelay;
2382                         if (slave->delay) {
2383                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2384                                         bond->dev->name,
2385                                         (bond->params.mode ==
2386                                          BOND_MODE_ACTIVEBACKUP) ?
2387                                         (bond_is_active_slave(slave) ?
2388                                          "active " : "backup ") : "",
2389                                         slave->dev->name,
2390                                         bond->params.downdelay * bond->params.miimon);
2391                         }
2392                         /*FALLTHRU*/
2393                 case BOND_LINK_FAIL:
2394                         if (link_state) {
2395                                 /*
2396                                  * recovered before downdelay expired
2397                                  */
2398                                 slave->link = BOND_LINK_UP;
2399                                 slave->jiffies = jiffies;
2400                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2401                                         bond->dev->name,
2402                                         (bond->params.downdelay - slave->delay) *
2403                                         bond->params.miimon,
2404                                         slave->dev->name);
2405                                 continue;
2406                         }
2407
2408                         if (slave->delay <= 0) {
2409                                 slave->new_link = BOND_LINK_DOWN;
2410                                 commit++;
2411                                 continue;
2412                         }
2413
2414                         slave->delay--;
2415                         break;
2416
2417                 case BOND_LINK_DOWN:
2418                         if (!link_state)
2419                                 continue;
2420
2421                         slave->link = BOND_LINK_BACK;
2422                         slave->delay = bond->params.updelay;
2423
2424                         if (slave->delay) {
2425                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2426                                         bond->dev->name, slave->dev->name,
2427                                         ignore_updelay ? 0 :
2428                                         bond->params.updelay *
2429                                         bond->params.miimon);
2430                         }
2431                         /*FALLTHRU*/
2432                 case BOND_LINK_BACK:
2433                         if (!link_state) {
2434                                 slave->link = BOND_LINK_DOWN;
2435                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2436                                         bond->dev->name,
2437                                         (bond->params.updelay - slave->delay) *
2438                                         bond->params.miimon,
2439                                         slave->dev->name);
2440
2441                                 continue;
2442                         }
2443
2444                         if (ignore_updelay)
2445                                 slave->delay = 0;
2446
2447                         if (slave->delay <= 0) {
2448                                 slave->new_link = BOND_LINK_UP;
2449                                 commit++;
2450                                 ignore_updelay = false;
2451                                 continue;
2452                         }
2453
2454                         slave->delay--;
2455                         break;
2456                 }
2457         }
2458
2459         return commit;
2460 }
2461
2462 static void bond_miimon_commit(struct bonding *bond)
2463 {
2464         struct slave *slave;
2465         int i;
2466
2467         bond_for_each_slave(bond, slave, i) {
2468                 switch (slave->new_link) {
2469                 case BOND_LINK_NOCHANGE:
2470                         continue;
2471
2472                 case BOND_LINK_UP:
2473                         slave->link = BOND_LINK_UP;
2474                         slave->jiffies = jiffies;
2475
2476                         if (bond->params.mode == BOND_MODE_8023AD) {
2477                                 /* prevent it from being the active one */
2478                                 bond_set_backup_slave(slave);
2479                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2480                                 /* make it immediately active */
2481                                 bond_set_active_slave(slave);
2482                         } else if (slave != bond->primary_slave) {
2483                                 /* prevent it from being the active one */
2484                                 bond_set_backup_slave(slave);
2485                         }
2486
2487                         bond_update_speed_duplex(slave);
2488
2489                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2490                                 bond->dev->name, slave->dev->name,
2491                                 slave->speed, slave->duplex ? "full" : "half");
2492
2493                         /* notify ad that the link status has changed */
2494                         if (bond->params.mode == BOND_MODE_8023AD)
2495                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2496
2497                         if (bond_is_lb(bond))
2498                                 bond_alb_handle_link_change(bond, slave,
2499                                                             BOND_LINK_UP);
2500
2501                         if (!bond->curr_active_slave ||
2502                             (slave == bond->primary_slave))
2503                                 goto do_failover;
2504
2505                         continue;
2506
2507                 case BOND_LINK_DOWN:
2508                         if (slave->link_failure_count < UINT_MAX)
2509                                 slave->link_failure_count++;
2510
2511                         slave->link = BOND_LINK_DOWN;
2512
2513                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2514                             bond->params.mode == BOND_MODE_8023AD)
2515                                 bond_set_slave_inactive_flags(slave);
2516
2517                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2518                                 bond->dev->name, slave->dev->name);
2519
2520                         if (bond->params.mode == BOND_MODE_8023AD)
2521                                 bond_3ad_handle_link_change(slave,
2522                                                             BOND_LINK_DOWN);
2523
2524                         if (bond_is_lb(bond))
2525                                 bond_alb_handle_link_change(bond, slave,
2526                                                             BOND_LINK_DOWN);
2527
2528                         if (slave == bond->curr_active_slave)
2529                                 goto do_failover;
2530
2531                         continue;
2532
2533                 default:
2534                         pr_err("%s: invalid new link %d on slave %s\n",
2535                                bond->dev->name, slave->new_link,
2536                                slave->dev->name);
2537                         slave->new_link = BOND_LINK_NOCHANGE;
2538
2539                         continue;
2540                 }
2541
2542 do_failover:
2543                 ASSERT_RTNL();
2544                 block_netpoll_tx();
2545                 write_lock_bh(&bond->curr_slave_lock);
2546                 bond_select_active_slave(bond);
2547                 write_unlock_bh(&bond->curr_slave_lock);
2548                 unblock_netpoll_tx();
2549         }
2550
2551         bond_set_carrier(bond);
2552 }
2553
2554 /*
2555  * bond_mii_monitor
2556  *
2557  * Really a wrapper that splits the mii monitor into two phases: an
2558  * inspection, then (if inspection indicates something needs to be done)
2559  * an acquisition of appropriate locks followed by a commit phase to
2560  * implement whatever link state changes are indicated.
2561  */
2562 void bond_mii_monitor(struct work_struct *work)
2563 {
2564         struct bonding *bond = container_of(work, struct bonding,
2565                                             mii_work.work);
2566         bool should_notify_peers = false;
2567
2568         read_lock(&bond->lock);
2569         if (bond->kill_timers)
2570                 goto out;
2571
2572         if (bond->slave_cnt == 0)
2573                 goto re_arm;
2574
2575         should_notify_peers = bond_should_notify_peers(bond);
2576
2577         if (bond_miimon_inspect(bond)) {
2578                 read_unlock(&bond->lock);
2579                 rtnl_lock();
2580                 read_lock(&bond->lock);
2581
2582                 bond_miimon_commit(bond);
2583
2584                 read_unlock(&bond->lock);
2585                 rtnl_unlock();  /* might sleep, hold no other locks */
2586                 read_lock(&bond->lock);
2587         }
2588
2589 re_arm:
2590         if (bond->params.miimon)
2591                 queue_delayed_work(bond->wq, &bond->mii_work,
2592                                    msecs_to_jiffies(bond->params.miimon));
2593 out:
2594         read_unlock(&bond->lock);
2595
2596         if (should_notify_peers) {
2597                 rtnl_lock();
2598                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
2599                 rtnl_unlock();
2600         }
2601 }
2602
2603 static __be32 bond_glean_dev_ip(struct net_device *dev)
2604 {
2605         struct in_device *idev;
2606         struct in_ifaddr *ifa;
2607         __be32 addr = 0;
2608
2609         if (!dev)
2610                 return 0;
2611
2612         rcu_read_lock();
2613         idev = __in_dev_get_rcu(dev);
2614         if (!idev)
2615                 goto out;
2616
2617         ifa = idev->ifa_list;
2618         if (!ifa)
2619                 goto out;
2620
2621         addr = ifa->ifa_local;
2622 out:
2623         rcu_read_unlock();
2624         return addr;
2625 }
2626
2627 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2628 {
2629         struct vlan_entry *vlan;
2630
2631         if (ip == bond->master_ip)
2632                 return 1;
2633
2634         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2635                 if (ip == vlan->vlan_ip)
2636                         return 1;
2637         }
2638
2639         return 0;
2640 }
2641
2642 /*
2643  * We go to the (large) trouble of VLAN tagging ARP frames because
2644  * switches in VLAN mode (especially if ports are configured as
2645  * "native" to a VLAN) might not pass non-tagged frames.
2646  */
2647 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2648 {
2649         struct sk_buff *skb;
2650
2651         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2652                  slave_dev->name, dest_ip, src_ip, vlan_id);
2653
2654         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2655                          NULL, slave_dev->dev_addr, NULL);
2656
2657         if (!skb) {
2658                 pr_err("ARP packet allocation failed\n");
2659                 return;
2660         }
2661         if (vlan_id) {
2662                 skb = vlan_put_tag(skb, vlan_id);
2663                 if (!skb) {
2664                         pr_err("failed to insert VLAN tag\n");
2665                         return;
2666                 }
2667         }
2668         arp_xmit(skb);
2669 }
2670
2671
2672 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2673 {
2674         int i, vlan_id;
2675         __be32 *targets = bond->params.arp_targets;
2676         struct vlan_entry *vlan;
2677         struct net_device *vlan_dev;
2678         struct rtable *rt;
2679
2680         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2681                 if (!targets[i])
2682                         break;
2683                 pr_debug("basa: target %x\n", targets[i]);
2684                 if (!bond->vlgrp) {
2685                         pr_debug("basa: empty vlan: arp_send\n");
2686                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2687                                       bond->master_ip, 0);
2688                         continue;
2689                 }
2690
2691                 /*
2692                  * If VLANs are configured, we do a route lookup to
2693                  * determine which VLAN interface would be used, so we
2694                  * can tag the ARP with the proper VLAN tag.
2695                  */
2696                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2697                                      RTO_ONLINK, 0);
2698                 if (IS_ERR(rt)) {
2699                         if (net_ratelimit()) {
2700                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2701                                            bond->dev->name, &targets[i]);
2702                         }
2703                         continue;
2704                 }
2705
2706                 /*
2707                  * This target is not on a VLAN
2708                  */
2709                 if (rt->dst.dev == bond->dev) {
2710                         ip_rt_put(rt);
2711                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2712                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2713                                       bond->master_ip, 0);
2714                         continue;
2715                 }
2716
2717                 vlan_id = 0;
2718                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2719                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2720                         if (vlan_dev == rt->dst.dev) {
2721                                 vlan_id = vlan->vlan_id;
2722                                 pr_debug("basa: vlan match on %s %d\n",
2723                                        vlan_dev->name, vlan_id);
2724                                 break;
2725                         }
2726                 }
2727
2728                 if (vlan_id) {
2729                         ip_rt_put(rt);
2730                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2731                                       vlan->vlan_ip, vlan_id);
2732                         continue;
2733                 }
2734
2735                 if (net_ratelimit()) {
2736                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2737                                    bond->dev->name, &targets[i],
2738                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2739                 }
2740                 ip_rt_put(rt);
2741         }
2742 }
2743
2744 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2745 {
2746         int i;
2747         __be32 *targets = bond->params.arp_targets;
2748
2749         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2750                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2751                          &sip, &tip, i, &targets[i],
2752                          bond_has_this_ip(bond, tip));
2753                 if (sip == targets[i]) {
2754                         if (bond_has_this_ip(bond, tip))
2755                                 slave->last_arp_rx = jiffies;
2756                         return;
2757                 }
2758         }
2759 }
2760
2761 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,
2762                          struct slave *slave)
2763 {
2764         struct arphdr *arp;
2765         unsigned char *arp_ptr;
2766         __be32 sip, tip;
2767
2768         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2769                 return;
2770
2771         read_lock(&bond->lock);
2772
2773         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2774                  bond->dev->name, skb->dev->name);
2775
2776         if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
2777                 goto out_unlock;
2778
2779         arp = arp_hdr(skb);
2780         if (arp->ar_hln != bond->dev->addr_len ||
2781             skb->pkt_type == PACKET_OTHERHOST ||
2782             skb->pkt_type == PACKET_LOOPBACK ||
2783             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2784             arp->ar_pro != htons(ETH_P_IP) ||
2785             arp->ar_pln != 4)
2786                 goto out_unlock;
2787
2788         arp_ptr = (unsigned char *)(arp + 1);
2789         arp_ptr += bond->dev->addr_len;
2790         memcpy(&sip, arp_ptr, 4);
2791         arp_ptr += 4 + bond->dev->addr_len;
2792         memcpy(&tip, arp_ptr, 4);
2793
2794         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2795                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2796                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2797                  &sip, &tip);
2798
2799         /*
2800          * Backup slaves won't see the ARP reply, but do come through
2801          * here for each ARP probe (so we swap the sip/tip to validate
2802          * the probe).  In a "redundant switch, common router" type of
2803          * configuration, the ARP probe will (hopefully) travel from
2804          * the active, through one switch, the router, then the other
2805          * switch before reaching the backup.
2806          */
2807         if (bond_is_active_slave(slave))
2808                 bond_validate_arp(bond, slave, sip, tip);
2809         else
2810                 bond_validate_arp(bond, slave, tip, sip);
2811
2812 out_unlock:
2813         read_unlock(&bond->lock);
2814 }
2815
2816 /*
2817  * this function is called regularly to monitor each slave's link
2818  * ensuring that traffic is being sent and received when arp monitoring
2819  * is used in load-balancing mode. if the adapter has been dormant, then an
2820  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2821  * arp monitoring in active backup mode.
2822  */
2823 void bond_loadbalance_arp_mon(struct work_struct *work)
2824 {
2825         struct bonding *bond = container_of(work, struct bonding,
2826                                             arp_work.work);
2827         struct slave *slave, *oldcurrent;
2828         int do_failover = 0;
2829         int delta_in_ticks;
2830         int i;
2831
2832         read_lock(&bond->lock);
2833
2834         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2835
2836         if (bond->kill_timers)
2837                 goto out;
2838
2839         if (bond->slave_cnt == 0)
2840                 goto re_arm;
2841
2842         read_lock(&bond->curr_slave_lock);
2843         oldcurrent = bond->curr_active_slave;
2844         read_unlock(&bond->curr_slave_lock);
2845
2846         /* see if any of the previous devices are up now (i.e. they have
2847          * xmt and rcv traffic). the curr_active_slave does not come into
2848          * the picture unless it is null. also, slave->jiffies is not needed
2849          * here because we send an arp on each slave and give a slave as
2850          * long as it needs to get the tx/rx within the delta.
2851          * TODO: what about up/down delay in arp mode? it wasn't here before
2852          *       so it can wait
2853          */
2854         bond_for_each_slave(bond, slave, i) {
2855                 unsigned long trans_start = dev_trans_start(slave->dev);
2856
2857                 if (slave->link != BOND_LINK_UP) {
2858                         if (time_in_range(jiffies,
2859                                 trans_start - delta_in_ticks,
2860                                 trans_start + delta_in_ticks) &&
2861                             time_in_range(jiffies,
2862                                 slave->dev->last_rx - delta_in_ticks,
2863                                 slave->dev->last_rx + delta_in_ticks)) {
2864
2865                                 slave->link  = BOND_LINK_UP;
2866                                 bond_set_active_slave(slave);
2867
2868                                 /* primary_slave has no meaning in round-robin
2869                                  * mode. the window of a slave being up and
2870                                  * curr_active_slave being null after enslaving
2871                                  * is closed.
2872                                  */
2873                                 if (!oldcurrent) {
2874                                         pr_info("%s: link status definitely up for interface %s, ",
2875                                                 bond->dev->name,
2876                                                 slave->dev->name);
2877                                         do_failover = 1;
2878                                 } else {
2879                                         pr_info("%s: interface %s is now up\n",
2880                                                 bond->dev->name,
2881                                                 slave->dev->name);
2882                                 }
2883                         }
2884                 } else {
2885                         /* slave->link == BOND_LINK_UP */
2886
2887                         /* not all switches will respond to an arp request
2888                          * when the source ip is 0, so don't take the link down
2889                          * if we don't know our ip yet
2890                          */
2891                         if (!time_in_range(jiffies,
2892                                 trans_start - delta_in_ticks,
2893                                 trans_start + 2 * delta_in_ticks) ||
2894                             !time_in_range(jiffies,
2895                                 slave->dev->last_rx - delta_in_ticks,
2896                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2897
2898                                 slave->link  = BOND_LINK_DOWN;
2899                                 bond_set_backup_slave(slave);
2900
2901                                 if (slave->link_failure_count < UINT_MAX)
2902                                         slave->link_failure_count++;
2903
2904                                 pr_info("%s: interface %s is now down.\n",
2905                                         bond->dev->name,
2906                                         slave->dev->name);
2907
2908                                 if (slave == oldcurrent)
2909                                         do_failover = 1;
2910                         }
2911                 }
2912
2913                 /* note: if switch is in round-robin mode, all links
2914                  * must tx arp to ensure all links rx an arp - otherwise
2915                  * links may oscillate or not come up at all; if switch is
2916                  * in something like xor mode, there is nothing we can
2917                  * do - all replies will be rx'ed on same link causing slaves
2918                  * to be unstable during low/no traffic periods
2919                  */
2920                 if (IS_UP(slave->dev))
2921                         bond_arp_send_all(bond, slave);
2922         }
2923
2924         if (do_failover) {
2925                 block_netpoll_tx();
2926                 write_lock_bh(&bond->curr_slave_lock);
2927
2928                 bond_select_active_slave(bond);
2929
2930                 write_unlock_bh(&bond->curr_slave_lock);
2931                 unblock_netpoll_tx();
2932         }
2933
2934 re_arm:
2935         if (bond->params.arp_interval)
2936                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2937 out:
2938         read_unlock(&bond->lock);
2939 }
2940
2941 /*
2942  * Called to inspect slaves for active-backup mode ARP monitor link state
2943  * changes.  Sets new_link in slaves to specify what action should take
2944  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2945  * to link states must be committed.
2946  *
2947  * Called with bond->lock held for read.
2948  */
2949 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2950 {
2951         struct slave *slave;
2952         int i, commit = 0;
2953         unsigned long trans_start;
2954
2955         bond_for_each_slave(bond, slave, i) {
2956                 slave->new_link = BOND_LINK_NOCHANGE;
2957
2958                 if (slave->link != BOND_LINK_UP) {
2959                         if (time_in_range(jiffies,
2960                                 slave_last_rx(bond, slave) - delta_in_ticks,
2961                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2962
2963                                 slave->new_link = BOND_LINK_UP;
2964                                 commit++;
2965                         }
2966
2967                         continue;
2968                 }
2969
2970                 /*
2971                  * Give slaves 2*delta after being enslaved or made
2972                  * active.  This avoids bouncing, as the last receive
2973                  * times need a full ARP monitor cycle to be updated.
2974                  */
2975                 if (time_in_range(jiffies,
2976                                   slave->jiffies - delta_in_ticks,
2977                                   slave->jiffies + 2 * delta_in_ticks))
2978                         continue;
2979
2980                 /*
2981                  * Backup slave is down if:
2982                  * - No current_arp_slave AND
2983                  * - more than 3*delta since last receive AND
2984                  * - the bond has an IP address
2985                  *
2986                  * Note: a non-null current_arp_slave indicates
2987                  * the curr_active_slave went down and we are
2988                  * searching for a new one; under this condition
2989                  * we only take the curr_active_slave down - this
2990                  * gives each slave a chance to tx/rx traffic
2991                  * before being taken out
2992                  */
2993                 if (!bond_is_active_slave(slave) &&
2994                     !bond->current_arp_slave &&
2995                     !time_in_range(jiffies,
2996                         slave_last_rx(bond, slave) - delta_in_ticks,
2997                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2998
2999                         slave->new_link = BOND_LINK_DOWN;
3000                         commit++;
3001                 }
3002
3003                 /*
3004                  * Active slave is down if:
3005                  * - more than 2*delta since transmitting OR
3006                  * - (more than 2*delta since receive AND
3007                  *    the bond has an IP address)
3008                  */
3009                 trans_start = dev_trans_start(slave->dev);
3010                 if (bond_is_active_slave(slave) &&
3011                     (!time_in_range(jiffies,
3012                         trans_start - delta_in_ticks,
3013                         trans_start + 2 * delta_in_ticks) ||
3014                      !time_in_range(jiffies,
3015                         slave_last_rx(bond, slave) - delta_in_ticks,
3016                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
3017
3018                         slave->new_link = BOND_LINK_DOWN;
3019                         commit++;
3020                 }
3021         }
3022
3023         return commit;
3024 }
3025
3026 /*
3027  * Called to commit link state changes noted by inspection step of
3028  * active-backup mode ARP monitor.
3029  *
3030  * Called with RTNL and bond->lock for read.
3031  */
3032 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3033 {
3034         struct slave *slave;
3035         int i;
3036         unsigned long trans_start;
3037
3038         bond_for_each_slave(bond, slave, i) {
3039                 switch (slave->new_link) {
3040                 case BOND_LINK_NOCHANGE:
3041                         continue;
3042
3043                 case BOND_LINK_UP:
3044                         trans_start = dev_trans_start(slave->dev);
3045                         if ((!bond->curr_active_slave &&
3046                              time_in_range(jiffies,
3047                                            trans_start - delta_in_ticks,
3048                                            trans_start + delta_in_ticks)) ||
3049                             bond->curr_active_slave != slave) {
3050                                 slave->link = BOND_LINK_UP;
3051                                 bond->current_arp_slave = NULL;
3052
3053                                 pr_info("%s: link status definitely up for interface %s.\n",
3054                                         bond->dev->name, slave->dev->name);
3055
3056                                 if (!bond->curr_active_slave ||
3057                                     (slave == bond->primary_slave))
3058                                         goto do_failover;
3059
3060                         }
3061
3062                         continue;
3063
3064                 case BOND_LINK_DOWN:
3065                         if (slave->link_failure_count < UINT_MAX)
3066                                 slave->link_failure_count++;
3067
3068                         slave->link = BOND_LINK_DOWN;
3069                         bond_set_slave_inactive_flags(slave);
3070
3071                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3072                                 bond->dev->name, slave->dev->name);
3073
3074                         if (slave == bond->curr_active_slave) {
3075                                 bond->current_arp_slave = NULL;
3076                                 goto do_failover;
3077                         }
3078
3079                         continue;
3080
3081                 default:
3082                         pr_err("%s: impossible: new_link %d on slave %s\n",
3083                                bond->dev->name, slave->new_link,
3084                                slave->dev->name);
3085                         continue;
3086                 }
3087
3088 do_failover:
3089                 ASSERT_RTNL();
3090                 block_netpoll_tx();
3091                 write_lock_bh(&bond->curr_slave_lock);
3092                 bond_select_active_slave(bond);
3093                 write_unlock_bh(&bond->curr_slave_lock);
3094                 unblock_netpoll_tx();
3095         }
3096
3097         bond_set_carrier(bond);
3098 }
3099
3100 /*
3101  * Send ARP probes for active-backup mode ARP monitor.
3102  *
3103  * Called with bond->lock held for read.
3104  */
3105 static void bond_ab_arp_probe(struct bonding *bond)
3106 {
3107         struct slave *slave;
3108         int i;
3109
3110         read_lock(&bond->curr_slave_lock);
3111
3112         if (bond->current_arp_slave && bond->curr_active_slave)
3113                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3114                         bond->current_arp_slave->dev->name,
3115                         bond->curr_active_slave->dev->name);
3116
3117         if (bond->curr_active_slave) {
3118                 bond_arp_send_all(bond, bond->curr_active_slave);
3119                 read_unlock(&bond->curr_slave_lock);
3120                 return;
3121         }
3122
3123         read_unlock(&bond->curr_slave_lock);
3124
3125         /* if we don't have a curr_active_slave, search for the next available
3126          * backup slave from the current_arp_slave and make it the candidate
3127          * for becoming the curr_active_slave
3128          */
3129
3130         if (!bond->current_arp_slave) {
3131                 bond->current_arp_slave = bond->first_slave;
3132                 if (!bond->current_arp_slave)
3133                         return;
3134         }
3135
3136         bond_set_slave_inactive_flags(bond->current_arp_slave);
3137
3138         /* search for next candidate */
3139         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3140                 if (IS_UP(slave->dev)) {
3141                         slave->link = BOND_LINK_BACK;
3142                         bond_set_slave_active_flags(slave);
3143                         bond_arp_send_all(bond, slave);
3144                         slave->jiffies = jiffies;
3145                         bond->current_arp_slave = slave;
3146                         break;
3147                 }
3148
3149                 /* if the link state is up at this point, we
3150                  * mark it down - this can happen if we have
3151                  * simultaneous link failures and
3152                  * reselect_active_interface doesn't make this
3153                  * one the current slave so it is still marked
3154                  * up when it is actually down
3155                  */
3156                 if (slave->link == BOND_LINK_UP) {
3157                         slave->link = BOND_LINK_DOWN;
3158                         if (slave->link_failure_count < UINT_MAX)
3159                                 slave->link_failure_count++;
3160
3161                         bond_set_slave_inactive_flags(slave);
3162
3163                         pr_info("%s: backup interface %s is now down.\n",
3164                                 bond->dev->name, slave->dev->name);
3165                 }
3166         }
3167 }
3168
3169 void bond_activebackup_arp_mon(struct work_struct *work)
3170 {
3171         struct bonding *bond = container_of(work, struct bonding,
3172                                             arp_work.work);
3173         bool should_notify_peers = false;
3174         int delta_in_ticks;
3175
3176         read_lock(&bond->lock);
3177
3178         if (bond->kill_timers)
3179                 goto out;
3180
3181         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3182
3183         if (bond->slave_cnt == 0)
3184                 goto re_arm;
3185
3186         should_notify_peers = bond_should_notify_peers(bond);
3187
3188         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3189                 read_unlock(&bond->lock);
3190                 rtnl_lock();
3191                 read_lock(&bond->lock);
3192
3193                 bond_ab_arp_commit(bond, delta_in_ticks);
3194
3195                 read_unlock(&bond->lock);
3196                 rtnl_unlock();
3197                 read_lock(&bond->lock);
3198         }
3199
3200         bond_ab_arp_probe(bond);
3201
3202 re_arm:
3203         if (bond->params.arp_interval)
3204                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3205 out:
3206         read_unlock(&bond->lock);
3207
3208         if (should_notify_peers) {
3209                 rtnl_lock();
3210                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
3211                 rtnl_unlock();
3212         }
3213 }
3214
3215 /*-------------------------- netdev event handling --------------------------*/
3216
3217 /*
3218  * Change device name
3219  */
3220 static int bond_event_changename(struct bonding *bond)
3221 {
3222         bond_remove_proc_entry(bond);
3223         bond_create_proc_entry(bond);
3224
3225         bond_debug_reregister(bond);
3226
3227         return NOTIFY_DONE;
3228 }
3229
3230 static int bond_master_netdev_event(unsigned long event,
3231                                     struct net_device *bond_dev)
3232 {
3233         struct bonding *event_bond = netdev_priv(bond_dev);
3234
3235         switch (event) {
3236         case NETDEV_CHANGENAME:
3237                 return bond_event_changename(event_bond);
3238         default:
3239                 break;
3240         }
3241
3242         return NOTIFY_DONE;
3243 }
3244
3245 static int bond_slave_netdev_event(unsigned long event,
3246                                    struct net_device *slave_dev)
3247 {
3248         struct net_device *bond_dev = slave_dev->master;
3249         struct bonding *bond = netdev_priv(bond_dev);
3250
3251         switch (event) {
3252         case NETDEV_UNREGISTER:
3253                 if (bond_dev) {
3254                         if (bond->setup_by_slave)
3255                                 bond_release_and_destroy(bond_dev, slave_dev);
3256                         else
3257                                 bond_release(bond_dev, slave_dev);
3258                 }
3259                 break;
3260         case NETDEV_CHANGE:
3261                 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3262                         struct slave *slave;
3263
3264                         slave = bond_get_slave_by_dev(bond, slave_dev);
3265                         if (slave) {
3266                                 u32 old_speed = slave->speed;
3267                                 u8  old_duplex = slave->duplex;
3268
3269                                 bond_update_speed_duplex(slave);
3270
3271                                 if (bond_is_lb(bond))
3272                                         break;
3273
3274                                 if (old_speed != slave->speed)
3275                                         bond_3ad_adapter_speed_changed(slave);
3276                                 if (old_duplex != slave->duplex)
3277                                         bond_3ad_adapter_duplex_changed(slave);
3278                         }
3279                 }
3280
3281                 break;
3282         case NETDEV_DOWN:
3283                 /*
3284                  * ... Or is it this?
3285                  */
3286                 break;
3287         case NETDEV_CHANGEMTU:
3288                 /*
3289                  * TODO: Should slaves be allowed to
3290                  * independently alter their MTU?  For
3291                  * an active-backup bond, slaves need
3292                  * not be the same type of device, so
3293                  * MTUs may vary.  For other modes,
3294                  * slaves arguably should have the
3295                  * same MTUs. To do this, we'd need to
3296                  * take over the slave's change_mtu
3297                  * function for the duration of their
3298                  * servitude.
3299                  */
3300                 break;
3301         case NETDEV_CHANGENAME:
3302                 /*
3303                  * TODO: handle changing the primary's name
3304                  */
3305                 break;
3306         case NETDEV_FEAT_CHANGE:
3307                 bond_compute_features(bond);
3308                 break;
3309         default:
3310                 break;
3311         }
3312
3313         return NOTIFY_DONE;
3314 }
3315
3316 /*
3317  * bond_netdev_event: handle netdev notifier chain events.
3318  *
3319  * This function receives events for the netdev chain.  The caller (an
3320  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3321  * locks for us to safely manipulate the slave devices (RTNL lock,
3322  * dev_probe_lock).
3323  */
3324 static int bond_netdev_event(struct notifier_block *this,
3325                              unsigned long event, void *ptr)
3326 {
3327         struct net_device *event_dev = (struct net_device *)ptr;
3328
3329         pr_debug("event_dev: %s, event: %lx\n",
3330                  event_dev ? event_dev->name : "None",
3331                  event);
3332
3333         if (!(event_dev->priv_flags & IFF_BONDING))
3334                 return NOTIFY_DONE;
3335
3336         if (event_dev->flags & IFF_MASTER) {
3337                 pr_debug("IFF_MASTER\n");
3338                 return bond_master_netdev_event(event, event_dev);
3339         }
3340
3341         if (event_dev->flags & IFF_SLAVE) {
3342                 pr_debug("IFF_SLAVE\n");
3343                 return bond_slave_netdev_event(event, event_dev);
3344         }
3345
3346         return NOTIFY_DONE;
3347 }
3348
3349 /*
3350  * bond_inetaddr_event: handle inetaddr notifier chain events.
3351  *
3352  * We keep track of device IPs primarily to use as source addresses in
3353  * ARP monitor probes (rather than spewing out broadcasts all the time).
3354  *
3355  * We track one IP for the main device (if it has one), plus one per VLAN.
3356  */
3357 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3358 {
3359         struct in_ifaddr *ifa = ptr;
3360         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3361         struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3362         struct bonding *bond;
3363         struct vlan_entry *vlan;
3364
3365         list_for_each_entry(bond, &bn->dev_list, bond_list) {
3366                 if (bond->dev == event_dev) {
3367                         switch (event) {
3368                         case NETDEV_UP:
3369                                 bond->master_ip = ifa->ifa_local;
3370                                 return NOTIFY_OK;
3371                         case NETDEV_DOWN:
3372                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3373                                 return NOTIFY_OK;
3374                         default:
3375                                 return NOTIFY_DONE;
3376                         }
3377                 }
3378
3379                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3380                         if (!bond->vlgrp)
3381                                 continue;
3382                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3383                         if (vlan_dev == event_dev) {
3384                                 switch (event) {
3385                                 case NETDEV_UP:
3386                                         vlan->vlan_ip = ifa->ifa_local;
3387                                         return NOTIFY_OK;
3388                                 case NETDEV_DOWN:
3389                                         vlan->vlan_ip =
3390                                                 bond_glean_dev_ip(vlan_dev);
3391                                         return NOTIFY_OK;
3392                                 default:
3393                                         return NOTIFY_DONE;
3394                                 }
3395                         }
3396                 }
3397         }
3398         return NOTIFY_DONE;
3399 }
3400
3401 static struct notifier_block bond_netdev_notifier = {
3402         .notifier_call = bond_netdev_event,
3403 };
3404
3405 static struct notifier_block bond_inetaddr_notifier = {
3406         .notifier_call = bond_inetaddr_event,
3407 };
3408
3409 /*---------------------------- Hashing Policies -----------------------------*/
3410
3411 /*
3412  * Hash for the output device based upon layer 2 and layer 3 data. If
3413  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3414  */
3415 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3416 {
3417         struct ethhdr *data = (struct ethhdr *)skb->data;
3418         struct iphdr *iph = ip_hdr(skb);
3419
3420         if (skb->protocol == htons(ETH_P_IP)) {
3421                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3422                         (data->h_dest[5] ^ data->h_source[5])) % count;
3423         }
3424
3425         return (data->h_dest[5] ^ data->h_source[5]) % count;
3426 }
3427
3428 /*
3429  * Hash for the output device based upon layer 3 and layer 4 data. If
3430  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3431  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3432  */
3433 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3434 {
3435         struct ethhdr *data = (struct ethhdr *)skb->data;
3436         struct iphdr *iph = ip_hdr(skb);
3437         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3438         int layer4_xor = 0;
3439
3440         if (skb->protocol == htons(ETH_P_IP)) {
3441                 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3442                     (iph->protocol == IPPROTO_TCP ||
3443                      iph->protocol == IPPROTO_UDP)) {
3444                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3445                 }
3446                 return (layer4_xor ^
3447                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3448
3449         }
3450
3451         return (data->h_dest[5] ^ data->h_source[5]) % count;
3452 }
3453
3454 /*
3455  * Hash for the output device based upon layer 2 data
3456  */
3457 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3458 {
3459         struct ethhdr *data = (struct ethhdr *)skb->data;
3460
3461         return (data->h_dest[5] ^ data->h_source[5]) % count;
3462 }
3463
3464 /*-------------------------- Device entry points ----------------------------*/
3465
3466 static int bond_open(struct net_device *bond_dev)
3467 {
3468         struct bonding *bond = netdev_priv(bond_dev);
3469
3470         bond->kill_timers = 0;
3471
3472         INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3473
3474         if (bond_is_lb(bond)) {
3475                 /* bond_alb_initialize must be called before the timer
3476                  * is started.
3477                  */
3478                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3479                         /* something went wrong - fail the open operation */
3480                         return -ENOMEM;
3481                 }
3482
3483                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3484                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3485         }
3486
3487         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3488                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3489                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3490         }
3491
3492         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3493                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3494                         INIT_DELAYED_WORK(&bond->arp_work,
3495                                           bond_activebackup_arp_mon);
3496                 else
3497                         INIT_DELAYED_WORK(&bond->arp_work,
3498                                           bond_loadbalance_arp_mon);
3499
3500                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3501                 if (bond->params.arp_validate)
3502                         bond->recv_probe = bond_arp_rcv;
3503         }
3504
3505         if (bond->params.mode == BOND_MODE_8023AD) {
3506                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3507                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3508                 /* register to receive LACPDUs */
3509                 bond->recv_probe = bond_3ad_lacpdu_recv;
3510                 bond_3ad_initiate_agg_selection(bond, 1);
3511         }
3512
3513         return 0;
3514 }
3515
3516 static int bond_close(struct net_device *bond_dev)
3517 {
3518         struct bonding *bond = netdev_priv(bond_dev);
3519
3520         write_lock_bh(&bond->lock);
3521
3522         bond->send_peer_notif = 0;
3523
3524         /* signal timers not to re-arm */
3525         bond->kill_timers = 1;
3526
3527         write_unlock_bh(&bond->lock);
3528
3529         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3530                 cancel_delayed_work(&bond->mii_work);
3531         }
3532
3533         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3534                 cancel_delayed_work(&bond->arp_work);
3535         }
3536
3537         switch (bond->params.mode) {
3538         case BOND_MODE_8023AD:
3539                 cancel_delayed_work(&bond->ad_work);
3540                 break;
3541         case BOND_MODE_TLB:
3542         case BOND_MODE_ALB:
3543                 cancel_delayed_work(&bond->alb_work);
3544                 break;
3545         default:
3546                 break;
3547         }
3548
3549         if (delayed_work_pending(&bond->mcast_work))
3550                 cancel_delayed_work(&bond->mcast_work);
3551
3552         if (bond_is_lb(bond)) {
3553                 /* Must be called only after all
3554                  * slaves have been released
3555                  */
3556                 bond_alb_deinitialize(bond);
3557         }
3558         bond->recv_probe = NULL;
3559
3560         return 0;
3561 }
3562
3563 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3564                                                 struct rtnl_link_stats64 *stats)
3565 {
3566         struct bonding *bond = netdev_priv(bond_dev);
3567         struct rtnl_link_stats64 temp;
3568         struct slave *slave;
3569         int i;
3570
3571         memset(stats, 0, sizeof(*stats));
3572
3573         read_lock_bh(&bond->lock);
3574
3575         bond_for_each_slave(bond, slave, i) {
3576                 const struct rtnl_link_stats64 *sstats =
3577                         dev_get_stats(slave->dev, &temp);
3578
3579                 stats->rx_packets += sstats->rx_packets;
3580                 stats->rx_bytes += sstats->rx_bytes;
3581                 stats->rx_errors += sstats->rx_errors;
3582                 stats->rx_dropped += sstats->rx_dropped;
3583
3584                 stats->tx_packets += sstats->tx_packets;
3585                 stats->tx_bytes += sstats->tx_bytes;
3586                 stats->tx_errors += sstats->tx_errors;
3587                 stats->tx_dropped += sstats->tx_dropped;
3588
3589                 stats->multicast += sstats->multicast;
3590                 stats->collisions += sstats->collisions;
3591
3592                 stats->rx_length_errors += sstats->rx_length_errors;
3593                 stats->rx_over_errors += sstats->rx_over_errors;
3594                 stats->rx_crc_errors += sstats->rx_crc_errors;
3595                 stats->rx_frame_errors += sstats->rx_frame_errors;
3596                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3597                 stats->rx_missed_errors += sstats->rx_missed_errors;
3598
3599                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3600                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3601                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3602                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3603                 stats->tx_window_errors += sstats->tx_window_errors;
3604         }
3605
3606         read_unlock_bh(&bond->lock);
3607
3608         return stats;
3609 }
3610
3611 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3612 {
3613         struct net_device *slave_dev = NULL;
3614         struct ifbond k_binfo;
3615         struct ifbond __user *u_binfo = NULL;
3616         struct ifslave k_sinfo;
3617         struct ifslave __user *u_sinfo = NULL;
3618         struct mii_ioctl_data *mii = NULL;
3619         int res = 0;
3620
3621         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3622
3623         switch (cmd) {
3624         case SIOCGMIIPHY:
3625                 mii = if_mii(ifr);
3626                 if (!mii)
3627                         return -EINVAL;
3628
3629                 mii->phy_id = 0;
3630                 /* Fall Through */
3631         case SIOCGMIIREG:
3632                 /*
3633                  * We do this again just in case we were called by SIOCGMIIREG
3634                  * instead of SIOCGMIIPHY.
3635                  */
3636                 mii = if_mii(ifr);
3637                 if (!mii)
3638                         return -EINVAL;
3639
3640
3641                 if (mii->reg_num == 1) {
3642                         struct bonding *bond = netdev_priv(bond_dev);
3643                         mii->val_out = 0;
3644                         read_lock(&bond->lock);
3645                         read_lock(&bond->curr_slave_lock);
3646                         if (netif_carrier_ok(bond->dev))
3647                                 mii->val_out = BMSR_LSTATUS;
3648
3649                         read_unlock(&bond->curr_slave_lock);
3650                         read_unlock(&bond->lock);
3651                 }
3652
3653                 return 0;
3654         case BOND_INFO_QUERY_OLD:
3655         case SIOCBONDINFOQUERY:
3656                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3657
3658                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3659                         return -EFAULT;
3660
3661                 res = bond_info_query(bond_dev, &k_binfo);
3662                 if (res == 0 &&
3663                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3664                         return -EFAULT;
3665
3666                 return res;
3667         case BOND_SLAVE_INFO_QUERY_OLD:
3668         case SIOCBONDSLAVEINFOQUERY:
3669                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3670
3671                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3672                         return -EFAULT;
3673
3674                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3675                 if (res == 0 &&
3676                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3677                         return -EFAULT;
3678
3679                 return res;
3680         default:
3681                 /* Go on */
3682                 break;
3683         }
3684
3685         if (!capable(CAP_NET_ADMIN))
3686                 return -EPERM;
3687
3688         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3689
3690         pr_debug("slave_dev=%p:\n", slave_dev);
3691
3692         if (!slave_dev)
3693                 res = -ENODEV;
3694         else {
3695                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3696                 switch (cmd) {
3697                 case BOND_ENSLAVE_OLD:
3698                 case SIOCBONDENSLAVE:
3699                         res = bond_enslave(bond_dev, slave_dev);
3700                         break;
3701                 case BOND_RELEASE_OLD:
3702                 case SIOCBONDRELEASE:
3703                         res = bond_release(bond_dev, slave_dev);
3704                         break;
3705                 case BOND_SETHWADDR_OLD:
3706                 case SIOCBONDSETHWADDR:
3707                         res = bond_sethwaddr(bond_dev, slave_dev);
3708                         break;
3709                 case BOND_CHANGE_ACTIVE_OLD:
3710                 case SIOCBONDCHANGEACTIVE:
3711                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3712                         break;
3713                 default:
3714                         res = -EOPNOTSUPP;
3715                 }
3716
3717                 dev_put(slave_dev);
3718         }
3719
3720         return res;
3721 }
3722
3723 static bool bond_addr_in_mc_list(unsigned char *addr,
3724                                  struct netdev_hw_addr_list *list,
3725                                  int addrlen)
3726 {
3727         struct netdev_hw_addr *ha;
3728
3729         netdev_hw_addr_list_for_each(ha, list)
3730                 if (!memcmp(ha->addr, addr, addrlen))
3731                         return true;
3732
3733         return false;
3734 }
3735
3736 static void bond_set_multicast_list(struct net_device *bond_dev)
3737 {
3738         struct bonding *bond = netdev_priv(bond_dev);
3739         struct netdev_hw_addr *ha;
3740         bool found;
3741
3742         /*
3743          * Do promisc before checking multicast_mode
3744          */
3745         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
3746                 /*
3747                  * FIXME: Need to handle the error when one of the multi-slaves
3748                  * encounters error.
3749                  */
3750                 bond_set_promiscuity(bond, 1);
3751
3752
3753         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
3754                 bond_set_promiscuity(bond, -1);
3755
3756
3757         /* set allmulti flag to slaves */
3758         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
3759                 /*
3760                  * FIXME: Need to handle the error when one of the multi-slaves
3761                  * encounters error.
3762                  */
3763                 bond_set_allmulti(bond, 1);
3764
3765
3766         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
3767                 bond_set_allmulti(bond, -1);
3768
3769
3770         read_lock(&bond->lock);
3771
3772         bond->flags = bond_dev->flags;
3773
3774         /* looking for addresses to add to slaves' mc list */
3775         netdev_for_each_mc_addr(ha, bond_dev) {
3776                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3777                                              bond_dev->addr_len);
3778                 if (!found)
3779                         bond_mc_add(bond, ha->addr);
3780         }
3781
3782         /* looking for addresses to delete from slaves' list */
3783         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3784                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3785                                              bond_dev->addr_len);
3786                 if (!found)
3787                         bond_mc_del(bond, ha->addr);
3788         }
3789
3790         /* save master's multicast list */
3791         __hw_addr_flush(&bond->mc_list);
3792         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3793                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3794
3795         read_unlock(&bond->lock);
3796 }
3797
3798 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
3799 {
3800         struct bonding *bond = netdev_priv(dev);
3801         struct slave *slave = bond->first_slave;
3802
3803         if (slave) {
3804                 const struct net_device_ops *slave_ops
3805                         = slave->dev->netdev_ops;
3806                 if (slave_ops->ndo_neigh_setup)
3807                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
3808         }
3809         return 0;
3810 }
3811
3812 /*
3813  * Change the MTU of all of a master's slaves to match the master
3814  */
3815 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3816 {
3817         struct bonding *bond = netdev_priv(bond_dev);
3818         struct slave *slave, *stop_at;
3819         int res = 0;
3820         int i;
3821
3822         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3823                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3824
3825         /* Can't hold bond->lock with bh disabled here since
3826          * some base drivers panic. On the other hand we can't
3827          * hold bond->lock without bh disabled because we'll
3828          * deadlock. The only solution is to rely on the fact
3829          * that we're under rtnl_lock here, and the slaves
3830          * list won't change. This doesn't solve the problem
3831          * of setting the slave's MTU while it is
3832          * transmitting, but the assumption is that the base
3833          * driver can handle that.
3834          *
3835          * TODO: figure out a way to safely iterate the slaves
3836          * list, but without holding a lock around the actual
3837          * call to the base driver.
3838          */
3839
3840         bond_for_each_slave(bond, slave, i) {
3841                 pr_debug("s %p s->p %p c_m %p\n",
3842                          slave,
3843                          slave->prev,
3844                          slave->dev->netdev_ops->ndo_change_mtu);
3845
3846                 res = dev_set_mtu(slave->dev, new_mtu);
3847
3848                 if (res) {
3849                         /* If we failed to set the slave's mtu to the new value
3850                          * we must abort the operation even in ACTIVE_BACKUP
3851                          * mode, because if we allow the backup slaves to have
3852                          * different mtu values than the active slave we'll
3853                          * need to change their mtu when doing a failover. That
3854                          * means changing their mtu from timer context, which
3855                          * is probably not a good idea.
3856                          */
3857                         pr_debug("err %d %s\n", res, slave->dev->name);
3858                         goto unwind;
3859                 }
3860         }
3861
3862         bond_dev->mtu = new_mtu;
3863
3864         return 0;
3865
3866 unwind:
3867         /* unwind from head to the slave that failed */
3868         stop_at = slave;
3869         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3870                 int tmp_res;
3871
3872                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3873                 if (tmp_res) {
3874                         pr_debug("unwind err %d dev %s\n",
3875                                  tmp_res, slave->dev->name);
3876                 }
3877         }
3878
3879         return res;
3880 }
3881
3882 /*
3883  * Change HW address
3884  *
3885  * Note that many devices must be down to change the HW address, and
3886  * downing the master releases all slaves.  We can make bonds full of
3887  * bonding devices to test this, however.
3888  */
3889 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3890 {
3891         struct bonding *bond = netdev_priv(bond_dev);
3892         struct sockaddr *sa = addr, tmp_sa;
3893         struct slave *slave, *stop_at;
3894         int res = 0;
3895         int i;
3896
3897         if (bond->params.mode == BOND_MODE_ALB)
3898                 return bond_alb_set_mac_address(bond_dev, addr);
3899
3900
3901         pr_debug("bond=%p, name=%s\n",
3902                  bond, bond_dev ? bond_dev->name : "None");
3903
3904         /*
3905          * If fail_over_mac is set to active, do nothing and return
3906          * success.  Returning an error causes ifenslave to fail.
3907          */
3908         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3909                 return 0;
3910
3911         if (!is_valid_ether_addr(sa->sa_data))
3912                 return -EADDRNOTAVAIL;
3913
3914         /* Can't hold bond->lock with bh disabled here since
3915          * some base drivers panic. On the other hand we can't
3916          * hold bond->lock without bh disabled because we'll
3917          * deadlock. The only solution is to rely on the fact
3918          * that we're under rtnl_lock here, and the slaves
3919          * list won't change. This doesn't solve the problem
3920          * of setting the slave's hw address while it is
3921          * transmitting, but the assumption is that the base
3922          * driver can handle that.
3923          *
3924          * TODO: figure out a way to safely iterate the slaves
3925          * list, but without holding a lock around the actual
3926          * call to the base driver.
3927          */
3928
3929         bond_for_each_slave(bond, slave, i) {
3930                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3931                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3932
3933                 if (slave_ops->ndo_set_mac_address == NULL) {
3934                         res = -EOPNOTSUPP;
3935                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3936                         goto unwind;
3937                 }
3938
3939                 res = dev_set_mac_address(slave->dev, addr);
3940                 if (res) {
3941                         /* TODO: consider downing the slave
3942                          * and retry ?
3943                          * User should expect communications
3944                          * breakage anyway until ARP finish
3945                          * updating, so...
3946                          */
3947                         pr_debug("err %d %s\n", res, slave->dev->name);
3948                         goto unwind;
3949                 }
3950         }
3951
3952         /* success */
3953         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3954         return 0;
3955
3956 unwind:
3957         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3958         tmp_sa.sa_family = bond_dev->type;
3959
3960         /* unwind from head to the slave that failed */
3961         stop_at = slave;
3962         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3963                 int tmp_res;
3964
3965                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3966                 if (tmp_res) {
3967                         pr_debug("unwind err %d dev %s\n",
3968                                  tmp_res, slave->dev->name);
3969                 }
3970         }
3971
3972         return res;
3973 }
3974
3975 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3976 {
3977         struct bonding *bond = netdev_priv(bond_dev);
3978         struct slave *slave, *start_at;
3979         int i, slave_no, res = 1;
3980         struct iphdr *iph = ip_hdr(skb);
3981
3982         /*
3983          * Start with the curr_active_slave that joined the bond as the
3984          * default for sending IGMP traffic.  For failover purposes one
3985          * needs to maintain some consistency for the interface that will
3986          * send the join/membership reports.  The curr_active_slave found
3987          * will send all of this type of traffic.
3988          */
3989         if ((iph->protocol == IPPROTO_IGMP) &&
3990             (skb->protocol == htons(ETH_P_IP))) {
3991
3992                 read_lock(&bond->curr_slave_lock);
3993                 slave = bond->curr_active_slave;
3994                 read_unlock(&bond->curr_slave_lock);
3995
3996                 if (!slave)
3997                         goto out;
3998         } else {
3999                 /*
4000                  * Concurrent TX may collide on rr_tx_counter; we accept
4001                  * that as being rare enough not to justify using an
4002                  * atomic op here.
4003                  */
4004                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4005
4006                 bond_for_each_slave(bond, slave, i) {
4007                         slave_no--;
4008                         if (slave_no < 0)
4009                                 break;
4010                 }
4011         }
4012
4013         start_at = slave;
4014         bond_for_each_slave_from(bond, slave, i, start_at) {
4015                 if (IS_UP(slave->dev) &&
4016                     (slave->link == BOND_LINK_UP) &&
4017                     bond_is_active_slave(slave)) {
4018                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4019                         break;
4020                 }
4021         }
4022
4023 out:
4024         if (res) {
4025                 /* no suitable interface, frame not sent */
4026                 dev_kfree_skb(skb);
4027         }
4028
4029         return NETDEV_TX_OK;
4030 }
4031
4032
4033 /*
4034  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4035  * the bond has a usable interface.
4036  */
4037 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4038 {
4039         struct bonding *bond = netdev_priv(bond_dev);
4040         int res = 1;
4041
4042         read_lock(&bond->curr_slave_lock);
4043
4044         if (bond->curr_active_slave)
4045                 res = bond_dev_queue_xmit(bond, skb,
4046                         bond->curr_active_slave->dev);
4047
4048         if (res)
4049                 /* no suitable interface, frame not sent */
4050                 dev_kfree_skb(skb);
4051
4052         read_unlock(&bond->curr_slave_lock);
4053
4054         return NETDEV_TX_OK;
4055 }
4056
4057 /*
4058  * In bond_xmit_xor() , we determine the output device by using a pre-
4059  * determined xmit_hash_policy(), If the selected device is not enabled,
4060  * find the next active slave.
4061  */
4062 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4063 {
4064         struct bonding *bond = netdev_priv(bond_dev);
4065         struct slave *slave, *start_at;
4066         int slave_no;
4067         int i;
4068         int res = 1;
4069
4070         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4071
4072         bond_for_each_slave(bond, slave, i) {
4073                 slave_no--;
4074                 if (slave_no < 0)
4075                         break;
4076         }
4077
4078         start_at = slave;
4079
4080         bond_for_each_slave_from(bond, slave, i, start_at) {
4081                 if (IS_UP(slave->dev) &&
4082                     (slave->link == BOND_LINK_UP) &&
4083                     bond_is_active_slave(slave)) {
4084                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4085                         break;
4086                 }
4087         }
4088
4089         if (res) {
4090                 /* no suitable interface, frame not sent */
4091                 dev_kfree_skb(skb);
4092         }
4093
4094         return NETDEV_TX_OK;
4095 }
4096
4097 /*
4098  * in broadcast mode, we send everything to all usable interfaces.
4099  */
4100 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4101 {
4102         struct bonding *bond = netdev_priv(bond_dev);
4103         struct slave *slave, *start_at;
4104         struct net_device *tx_dev = NULL;
4105         int i;
4106         int res = 1;
4107
4108         read_lock(&bond->curr_slave_lock);
4109         start_at = bond->curr_active_slave;
4110         read_unlock(&bond->curr_slave_lock);
4111
4112         if (!start_at)
4113                 goto out;
4114
4115         bond_for_each_slave_from(bond, slave, i, start_at) {
4116                 if (IS_UP(slave->dev) &&
4117                     (slave->link == BOND_LINK_UP) &&
4118                     bond_is_active_slave(slave)) {
4119                         if (tx_dev) {
4120                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4121                                 if (!skb2) {
4122                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4123                                                bond_dev->name);
4124                                         continue;
4125                                 }
4126
4127                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4128                                 if (res) {
4129                                         dev_kfree_skb(skb2);
4130                                         continue;
4131                                 }
4132                         }
4133                         tx_dev = slave->dev;
4134                 }
4135         }
4136
4137         if (tx_dev)
4138                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4139
4140 out:
4141         if (res)
4142                 /* no suitable interface, frame not sent */
4143                 dev_kfree_skb(skb);
4144
4145         /* frame sent to all suitable interfaces */
4146         return NETDEV_TX_OK;
4147 }
4148
4149 /*------------------------- Device initialization ---------------------------*/
4150
4151 static void bond_set_xmit_hash_policy(struct bonding *bond)
4152 {
4153         switch (bond->params.xmit_policy) {
4154         case BOND_XMIT_POLICY_LAYER23:
4155                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4156                 break;
4157         case BOND_XMIT_POLICY_LAYER34:
4158                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4159                 break;
4160         case BOND_XMIT_POLICY_LAYER2:
4161         default:
4162                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4163                 break;
4164         }
4165 }
4166
4167 /*
4168  * Lookup the slave that corresponds to a qid
4169  */
4170 static inline int bond_slave_override(struct bonding *bond,
4171                                       struct sk_buff *skb)
4172 {
4173         int i, res = 1;
4174         struct slave *slave = NULL;
4175         struct slave *check_slave;
4176
4177         if (!skb->queue_mapping)
4178                 return 1;
4179
4180         /* Find out if any slaves have the same mapping as this skb. */
4181         bond_for_each_slave(bond, check_slave, i) {
4182                 if (check_slave->queue_id == skb->queue_mapping) {
4183                         slave = check_slave;
4184                         break;
4185                 }
4186         }
4187
4188         /* If the slave isn't UP, use default transmit policy. */
4189         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4190             (slave->link == BOND_LINK_UP)) {
4191                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4192         }
4193
4194         return res;
4195 }
4196
4197 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4198 {
4199         /*
4200          * This helper function exists to help dev_pick_tx get the correct
4201          * destination queue.  Using a helper function skips a call to
4202          * skb_tx_hash and will put the skbs in the queue we expect on their
4203          * way down to the bonding driver.
4204          */
4205         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4206
4207         if (unlikely(txq >= dev->real_num_tx_queues)) {
4208                 do {
4209                         txq -= dev->real_num_tx_queues;
4210                 } while (txq >= dev->real_num_tx_queues);
4211         }
4212         return txq;
4213 }
4214
4215 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4216 {
4217         struct bonding *bond = netdev_priv(dev);
4218
4219         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4220                 if (!bond_slave_override(bond, skb))
4221                         return NETDEV_TX_OK;
4222         }
4223
4224         switch (bond->params.mode) {
4225         case BOND_MODE_ROUNDROBIN:
4226                 return bond_xmit_roundrobin(skb, dev);
4227         case BOND_MODE_ACTIVEBACKUP:
4228                 return bond_xmit_activebackup(skb, dev);
4229         case BOND_MODE_XOR:
4230                 return bond_xmit_xor(skb, dev);
4231         case BOND_MODE_BROADCAST:
4232                 return bond_xmit_broadcast(skb, dev);
4233         case BOND_MODE_8023AD:
4234                 return bond_3ad_xmit_xor(skb, dev);
4235         case BOND_MODE_ALB:
4236         case BOND_MODE_TLB:
4237                 return bond_alb_xmit(skb, dev);
4238         default:
4239                 /* Should never happen, mode already checked */
4240                 pr_err("%s: Error: Unknown bonding mode %d\n",
4241                        dev->name, bond->params.mode);
4242                 WARN_ON_ONCE(1);
4243                 dev_kfree_skb(skb);
4244                 return NETDEV_TX_OK;
4245         }
4246 }
4247
4248 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4249 {
4250         struct bonding *bond = netdev_priv(dev);
4251         netdev_tx_t ret = NETDEV_TX_OK;
4252
4253         /*
4254          * If we risk deadlock from transmitting this in the
4255          * netpoll path, tell netpoll to queue the frame for later tx
4256          */
4257         if (is_netpoll_tx_blocked(dev))
4258                 return NETDEV_TX_BUSY;
4259
4260         read_lock(&bond->lock);
4261
4262         if (bond->slave_cnt)
4263                 ret = __bond_start_xmit(skb, dev);
4264         else
4265                 dev_kfree_skb(skb);
4266
4267         read_unlock(&bond->lock);
4268
4269         return ret;
4270 }
4271
4272 /*
4273  * set bond mode specific net device operations
4274  */
4275 void bond_set_mode_ops(struct bonding *bond, int mode)
4276 {
4277         struct net_device *bond_dev = bond->dev;
4278
4279         switch (mode) {
4280         case BOND_MODE_ROUNDROBIN:
4281                 break;
4282         case BOND_MODE_ACTIVEBACKUP:
4283                 break;
4284         case BOND_MODE_XOR:
4285                 bond_set_xmit_hash_policy(bond);
4286                 break;
4287         case BOND_MODE_BROADCAST:
4288                 break;
4289         case BOND_MODE_8023AD:
4290                 bond_set_xmit_hash_policy(bond);
4291                 break;
4292         case BOND_MODE_ALB:
4293                 /* FALLTHRU */
4294         case BOND_MODE_TLB:
4295                 break;
4296         default:
4297                 /* Should never happen, mode already checked */
4298                 pr_err("%s: Error: Unknown bonding mode %d\n",
4299                        bond_dev->name, mode);
4300                 break;
4301         }
4302 }
4303
4304 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4305                                     struct ethtool_drvinfo *drvinfo)
4306 {
4307         strncpy(drvinfo->driver, DRV_NAME, 32);
4308         strncpy(drvinfo->version, DRV_VERSION, 32);
4309         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4310 }
4311
4312 static const struct ethtool_ops bond_ethtool_ops = {
4313         .get_drvinfo            = bond_ethtool_get_drvinfo,
4314         .get_link               = ethtool_op_get_link,
4315 };
4316
4317 static const struct net_device_ops bond_netdev_ops = {
4318         .ndo_init               = bond_init,
4319         .ndo_uninit             = bond_uninit,
4320         .ndo_open               = bond_open,
4321         .ndo_stop               = bond_close,
4322         .ndo_start_xmit         = bond_start_xmit,
4323         .ndo_select_queue       = bond_select_queue,
4324         .ndo_get_stats64        = bond_get_stats,
4325         .ndo_do_ioctl           = bond_do_ioctl,
4326         .ndo_set_multicast_list = bond_set_multicast_list,
4327         .ndo_change_mtu         = bond_change_mtu,
4328         .ndo_set_mac_address    = bond_set_mac_address,
4329         .ndo_neigh_setup        = bond_neigh_setup,
4330         .ndo_vlan_rx_register   = bond_vlan_rx_register,
4331         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4332         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4333 #ifdef CONFIG_NET_POLL_CONTROLLER
4334         .ndo_netpoll_setup      = bond_netpoll_setup,
4335         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4336         .ndo_poll_controller    = bond_poll_controller,
4337 #endif
4338         .ndo_add_slave          = bond_enslave,
4339         .ndo_del_slave          = bond_release,
4340         .ndo_fix_features       = bond_fix_features,
4341 };
4342
4343 static void bond_destructor(struct net_device *bond_dev)
4344 {
4345         struct bonding *bond = netdev_priv(bond_dev);
4346         if (bond->wq)
4347                 destroy_workqueue(bond->wq);
4348         free_netdev(bond_dev);
4349 }
4350
4351 static void bond_setup(struct net_device *bond_dev)
4352 {
4353         struct bonding *bond = netdev_priv(bond_dev);
4354
4355         /* initialize rwlocks */
4356         rwlock_init(&bond->lock);
4357         rwlock_init(&bond->curr_slave_lock);
4358
4359         bond->params = bonding_defaults;
4360
4361         /* Initialize pointers */
4362         bond->dev = bond_dev;
4363         INIT_LIST_HEAD(&bond->vlan_list);
4364
4365         /* Initialize the device entry points */
4366         ether_setup(bond_dev);
4367         bond_dev->netdev_ops = &bond_netdev_ops;
4368         bond_dev->ethtool_ops = &bond_ethtool_ops;
4369         bond_set_mode_ops(bond, bond->params.mode);
4370
4371         bond_dev->destructor = bond_destructor;
4372
4373         /* Initialize the device options */
4374         bond_dev->tx_queue_len = 0;
4375         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4376         bond_dev->priv_flags |= IFF_BONDING;
4377         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
4378
4379         /* At first, we block adding VLANs. That's the only way to
4380          * prevent problems that occur when adding VLANs over an
4381          * empty bond. The block will be removed once non-challenged
4382          * slaves are enslaved.
4383          */
4384         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4385
4386         /* don't acquire bond device's netif_tx_lock when
4387          * transmitting */
4388         bond_dev->features |= NETIF_F_LLTX;
4389
4390         /* By default, we declare the bond to be fully
4391          * VLAN hardware accelerated capable. Special
4392          * care is taken in the various xmit functions
4393          * when there are slaves that are not hw accel
4394          * capable
4395          */
4396
4397         bond_dev->hw_features = BOND_VLAN_FEATURES |
4398                                 NETIF_F_HW_VLAN_TX |
4399                                 NETIF_F_HW_VLAN_RX |
4400                                 NETIF_F_HW_VLAN_FILTER;
4401
4402         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM);
4403         bond_dev->features |= bond_dev->hw_features;
4404 }
4405
4406 static void bond_work_cancel_all(struct bonding *bond)
4407 {
4408         write_lock_bh(&bond->lock);
4409         bond->kill_timers = 1;
4410         write_unlock_bh(&bond->lock);
4411
4412         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4413                 cancel_delayed_work(&bond->mii_work);
4414
4415         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4416                 cancel_delayed_work(&bond->arp_work);
4417
4418         if (bond->params.mode == BOND_MODE_ALB &&
4419             delayed_work_pending(&bond->alb_work))
4420                 cancel_delayed_work(&bond->alb_work);
4421
4422         if (bond->params.mode == BOND_MODE_8023AD &&
4423             delayed_work_pending(&bond->ad_work))
4424                 cancel_delayed_work(&bond->ad_work);
4425
4426         if (delayed_work_pending(&bond->mcast_work))
4427                 cancel_delayed_work(&bond->mcast_work);
4428 }
4429
4430 /*
4431 * Destroy a bonding device.
4432 * Must be under rtnl_lock when this function is called.
4433 */
4434 static void bond_uninit(struct net_device *bond_dev)
4435 {
4436         struct bonding *bond = netdev_priv(bond_dev);
4437         struct vlan_entry *vlan, *tmp;
4438
4439         bond_netpoll_cleanup(bond_dev);
4440
4441         /* Release the bonded slaves */
4442         bond_release_all(bond_dev);
4443
4444         list_del(&bond->bond_list);
4445
4446         bond_work_cancel_all(bond);
4447
4448         bond_remove_proc_entry(bond);
4449
4450         bond_debug_unregister(bond);
4451
4452         __hw_addr_flush(&bond->mc_list);
4453
4454         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4455                 list_del(&vlan->vlan_list);
4456                 kfree(vlan);
4457         }
4458 }
4459
4460 /*------------------------- Module initialization ---------------------------*/
4461
4462 /*
4463  * Convert string input module parms.  Accept either the
4464  * number of the mode or its string name.  A bit complicated because
4465  * some mode names are substrings of other names, and calls from sysfs
4466  * may have whitespace in the name (trailing newlines, for example).
4467  */
4468 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4469 {
4470         int modeint = -1, i, rv;
4471         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4472
4473         for (p = (char *)buf; *p; p++)
4474                 if (!(isdigit(*p) || isspace(*p)))
4475                         break;
4476
4477         if (*p)
4478                 rv = sscanf(buf, "%20s", modestr);
4479         else
4480                 rv = sscanf(buf, "%d", &modeint);
4481
4482         if (!rv)
4483                 return -1;
4484
4485         for (i = 0; tbl[i].modename; i++) {
4486                 if (modeint == tbl[i].mode)
4487                         return tbl[i].mode;
4488                 if (strcmp(modestr, tbl[i].modename) == 0)
4489                         return tbl[i].mode;
4490         }
4491
4492         return -1;
4493 }
4494
4495 static int bond_check_params(struct bond_params *params)
4496 {
4497         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4498
4499         /*
4500          * Convert string parameters.
4501          */
4502         if (mode) {
4503                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4504                 if (bond_mode == -1) {
4505                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4506                                mode == NULL ? "NULL" : mode);
4507                         return -EINVAL;
4508                 }
4509         }
4510
4511         if (xmit_hash_policy) {
4512                 if ((bond_mode != BOND_MODE_XOR) &&
4513                     (bond_mode != BOND_MODE_8023AD)) {
4514                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4515                                bond_mode_name(bond_mode));
4516                 } else {
4517                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4518                                                         xmit_hashtype_tbl);
4519                         if (xmit_hashtype == -1) {
4520                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4521                                        xmit_hash_policy == NULL ? "NULL" :
4522                                        xmit_hash_policy);
4523                                 return -EINVAL;
4524                         }
4525                 }
4526         }
4527
4528         if (lacp_rate) {
4529                 if (bond_mode != BOND_MODE_8023AD) {
4530                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4531                                 bond_mode_name(bond_mode));
4532                 } else {
4533                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4534                         if (lacp_fast == -1) {
4535                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4536                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4537                                 return -EINVAL;
4538                         }
4539                 }
4540         }
4541
4542         if (ad_select) {
4543                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4544                 if (params->ad_select == -1) {
4545                         pr_err("Error: Invalid ad_select \"%s\"\n",
4546                                ad_select == NULL ? "NULL" : ad_select);
4547                         return -EINVAL;
4548                 }
4549
4550                 if (bond_mode != BOND_MODE_8023AD) {
4551                         pr_warning("ad_select param only affects 802.3ad mode\n");
4552                 }
4553         } else {
4554                 params->ad_select = BOND_AD_STABLE;
4555         }
4556
4557         if (max_bonds < 0) {
4558                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4559                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4560                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4561         }
4562
4563         if (miimon < 0) {
4564                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4565                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4566                 miimon = BOND_LINK_MON_INTERV;
4567         }
4568
4569         if (updelay < 0) {
4570                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4571                            updelay, INT_MAX);
4572                 updelay = 0;
4573         }
4574
4575         if (downdelay < 0) {
4576                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4577                            downdelay, INT_MAX);
4578                 downdelay = 0;
4579         }
4580
4581         if ((use_carrier != 0) && (use_carrier != 1)) {
4582                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4583                            use_carrier);
4584                 use_carrier = 1;
4585         }
4586
4587         if (num_peer_notif < 0 || num_peer_notif > 255) {
4588                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4589                            num_peer_notif);
4590                 num_peer_notif = 1;
4591         }
4592
4593         /* reset values for 802.3ad */
4594         if (bond_mode == BOND_MODE_8023AD) {
4595                 if (!miimon) {
4596                         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");
4597                         pr_warning("Forcing miimon to 100msec\n");
4598                         miimon = 100;
4599                 }
4600         }
4601
4602         if (tx_queues < 1 || tx_queues > 255) {
4603                 pr_warning("Warning: tx_queues (%d) should be between "
4604                            "1 and 255, resetting to %d\n",
4605                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4606                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4607         }
4608
4609         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4610                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4611                            "not of valid value (0/1), so it was set to "
4612                            "0\n", all_slaves_active);
4613                 all_slaves_active = 0;
4614         }
4615
4616         if (resend_igmp < 0 || resend_igmp > 255) {
4617                 pr_warning("Warning: resend_igmp (%d) should be between "
4618                            "0 and 255, resetting to %d\n",
4619                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4620                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4621         }
4622
4623         /* reset values for TLB/ALB */
4624         if ((bond_mode == BOND_MODE_TLB) ||
4625             (bond_mode == BOND_MODE_ALB)) {
4626                 if (!miimon) {
4627                         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");
4628                         pr_warning("Forcing miimon to 100msec\n");
4629                         miimon = 100;
4630                 }
4631         }
4632
4633         if (bond_mode == BOND_MODE_ALB) {
4634                 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",
4635                           updelay);
4636         }
4637
4638         if (!miimon) {
4639                 if (updelay || downdelay) {
4640                         /* just warn the user the up/down delay will have
4641                          * no effect since miimon is zero...
4642                          */
4643                         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",
4644                                    updelay, downdelay);
4645                 }
4646         } else {
4647                 /* don't allow arp monitoring */
4648                 if (arp_interval) {
4649                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4650                                    miimon, arp_interval);
4651                         arp_interval = 0;
4652                 }
4653
4654                 if ((updelay % miimon) != 0) {
4655                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4656                                    updelay, miimon,
4657                                    (updelay / miimon) * miimon);
4658                 }
4659
4660                 updelay /= miimon;
4661
4662                 if ((downdelay % miimon) != 0) {
4663                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4664                                    downdelay, miimon,
4665                                    (downdelay / miimon) * miimon);
4666                 }
4667
4668                 downdelay /= miimon;
4669         }
4670
4671         if (arp_interval < 0) {
4672                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4673                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4674                 arp_interval = BOND_LINK_ARP_INTERV;
4675         }
4676
4677         for (arp_ip_count = 0;
4678              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4679              arp_ip_count++) {
4680                 /* not complete check, but should be good enough to
4681                    catch mistakes */
4682                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4683                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4684                                    arp_ip_target[arp_ip_count]);
4685                         arp_interval = 0;
4686                 } else {
4687                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4688                         arp_target[arp_ip_count] = ip;
4689                 }
4690         }
4691
4692         if (arp_interval && !arp_ip_count) {
4693                 /* don't allow arping if no arp_ip_target given... */
4694                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4695                            arp_interval);
4696                 arp_interval = 0;
4697         }
4698
4699         if (arp_validate) {
4700                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4701                         pr_err("arp_validate only supported in active-backup mode\n");
4702                         return -EINVAL;
4703                 }
4704                 if (!arp_interval) {
4705                         pr_err("arp_validate requires arp_interval\n");
4706                         return -EINVAL;
4707                 }
4708
4709                 arp_validate_value = bond_parse_parm(arp_validate,
4710                                                      arp_validate_tbl);
4711                 if (arp_validate_value == -1) {
4712                         pr_err("Error: invalid arp_validate \"%s\"\n",
4713                                arp_validate == NULL ? "NULL" : arp_validate);
4714                         return -EINVAL;
4715                 }
4716         } else
4717                 arp_validate_value = 0;
4718
4719         if (miimon) {
4720                 pr_info("MII link monitoring set to %d ms\n", miimon);
4721         } else if (arp_interval) {
4722                 int i;
4723
4724                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4725                         arp_interval,
4726                         arp_validate_tbl[arp_validate_value].modename,
4727                         arp_ip_count);
4728
4729                 for (i = 0; i < arp_ip_count; i++)
4730                         pr_info(" %s", arp_ip_target[i]);
4731
4732                 pr_info("\n");
4733
4734         } else if (max_bonds) {
4735                 /* miimon and arp_interval not set, we need one so things
4736                  * work as expected, see bonding.txt for details
4737                  */
4738                 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");
4739         }
4740
4741         if (primary && !USES_PRIMARY(bond_mode)) {
4742                 /* currently, using a primary only makes sense
4743                  * in active backup, TLB or ALB modes
4744                  */
4745                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4746                            primary, bond_mode_name(bond_mode));
4747                 primary = NULL;
4748         }
4749
4750         if (primary && primary_reselect) {
4751                 primary_reselect_value = bond_parse_parm(primary_reselect,
4752                                                          pri_reselect_tbl);
4753                 if (primary_reselect_value == -1) {
4754                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4755                                primary_reselect ==
4756                                         NULL ? "NULL" : primary_reselect);
4757                         return -EINVAL;
4758                 }
4759         } else {
4760                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4761         }
4762
4763         if (fail_over_mac) {
4764                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4765                                                       fail_over_mac_tbl);
4766                 if (fail_over_mac_value == -1) {
4767                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4768                                arp_validate == NULL ? "NULL" : arp_validate);
4769                         return -EINVAL;
4770                 }
4771
4772                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4773                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4774         } else {
4775                 fail_over_mac_value = BOND_FOM_NONE;
4776         }
4777
4778         /* fill params struct with the proper values */
4779         params->mode = bond_mode;
4780         params->xmit_policy = xmit_hashtype;
4781         params->miimon = miimon;
4782         params->num_peer_notif = num_peer_notif;
4783         params->arp_interval = arp_interval;
4784         params->arp_validate = arp_validate_value;
4785         params->updelay = updelay;
4786         params->downdelay = downdelay;
4787         params->use_carrier = use_carrier;
4788         params->lacp_fast = lacp_fast;
4789         params->primary[0] = 0;
4790         params->primary_reselect = primary_reselect_value;
4791         params->fail_over_mac = fail_over_mac_value;
4792         params->tx_queues = tx_queues;
4793         params->all_slaves_active = all_slaves_active;
4794         params->resend_igmp = resend_igmp;
4795
4796         if (primary) {
4797                 strncpy(params->primary, primary, IFNAMSIZ);
4798                 params->primary[IFNAMSIZ - 1] = 0;
4799         }
4800
4801         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4802
4803         return 0;
4804 }
4805
4806 static struct lock_class_key bonding_netdev_xmit_lock_key;
4807 static struct lock_class_key bonding_netdev_addr_lock_key;
4808
4809 static void bond_set_lockdep_class_one(struct net_device *dev,
4810                                        struct netdev_queue *txq,
4811                                        void *_unused)
4812 {
4813         lockdep_set_class(&txq->_xmit_lock,
4814                           &bonding_netdev_xmit_lock_key);
4815 }
4816
4817 static void bond_set_lockdep_class(struct net_device *dev)
4818 {
4819         lockdep_set_class(&dev->addr_list_lock,
4820                           &bonding_netdev_addr_lock_key);
4821         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4822 }
4823
4824 /*
4825  * Called from registration process
4826  */
4827 static int bond_init(struct net_device *bond_dev)
4828 {
4829         struct bonding *bond = netdev_priv(bond_dev);
4830         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4831         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4832
4833         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4834
4835         /*
4836          * Initialize locks that may be required during
4837          * en/deslave operations.  All of the bond_open work
4838          * (of which this is part) should really be moved to
4839          * a phase prior to dev_open
4840          */
4841         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4842         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4843
4844         bond->wq = create_singlethread_workqueue(bond_dev->name);
4845         if (!bond->wq)
4846                 return -ENOMEM;
4847
4848         bond_set_lockdep_class(bond_dev);
4849
4850         bond_create_proc_entry(bond);
4851         list_add_tail(&bond->bond_list, &bn->dev_list);
4852
4853         bond_prepare_sysfs_group(bond);
4854
4855         bond_debug_register(bond);
4856
4857         __hw_addr_init(&bond->mc_list);
4858         return 0;
4859 }
4860
4861 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4862 {
4863         if (tb[IFLA_ADDRESS]) {
4864                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4865                         return -EINVAL;
4866                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4867                         return -EADDRNOTAVAIL;
4868         }
4869         return 0;
4870 }
4871
4872 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4873         .kind           = "bond",
4874         .priv_size      = sizeof(struct bonding),
4875         .setup          = bond_setup,
4876         .validate       = bond_validate,
4877 };
4878
4879 /* Create a new bond based on the specified name and bonding parameters.
4880  * If name is NULL, obtain a suitable "bond%d" name for us.
4881  * Caller must NOT hold rtnl_lock; we need to release it here before we
4882  * set up our sysfs entries.
4883  */
4884 int bond_create(struct net *net, const char *name)
4885 {
4886         struct net_device *bond_dev;
4887         int res;
4888
4889         rtnl_lock();
4890
4891         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4892                                    name ? name : "bond%d",
4893                                    bond_setup, tx_queues);
4894         if (!bond_dev) {
4895                 pr_err("%s: eek! can't alloc netdev!\n", name);
4896                 rtnl_unlock();
4897                 return -ENOMEM;
4898         }
4899
4900         dev_net_set(bond_dev, net);
4901         bond_dev->rtnl_link_ops = &bond_link_ops;
4902
4903         res = register_netdevice(bond_dev);
4904
4905         netif_carrier_off(bond_dev);
4906
4907         rtnl_unlock();
4908         if (res < 0)
4909                 bond_destructor(bond_dev);
4910         return res;
4911 }
4912
4913 static int __net_init bond_net_init(struct net *net)
4914 {
4915         struct bond_net *bn = net_generic(net, bond_net_id);
4916
4917         bn->net = net;
4918         INIT_LIST_HEAD(&bn->dev_list);
4919
4920         bond_create_proc_dir(bn);
4921
4922         return 0;
4923 }
4924
4925 static void __net_exit bond_net_exit(struct net *net)
4926 {
4927         struct bond_net *bn = net_generic(net, bond_net_id);
4928
4929         bond_destroy_proc_dir(bn);
4930 }
4931
4932 static struct pernet_operations bond_net_ops = {
4933         .init = bond_net_init,
4934         .exit = bond_net_exit,
4935         .id   = &bond_net_id,
4936         .size = sizeof(struct bond_net),
4937 };
4938
4939 static int __init bonding_init(void)
4940 {
4941         int i;
4942         int res;
4943
4944         pr_info("%s", bond_version);
4945
4946         res = bond_check_params(&bonding_defaults);
4947         if (res)
4948                 goto out;
4949
4950         res = register_pernet_subsys(&bond_net_ops);
4951         if (res)
4952                 goto out;
4953
4954         res = rtnl_link_register(&bond_link_ops);
4955         if (res)
4956                 goto err_link;
4957
4958         bond_create_debugfs();
4959
4960         for (i = 0; i < max_bonds; i++) {
4961                 res = bond_create(&init_net, NULL);
4962                 if (res)
4963                         goto err;
4964         }
4965
4966         res = bond_create_sysfs();
4967         if (res)
4968                 goto err;
4969
4970         register_netdevice_notifier(&bond_netdev_notifier);
4971         register_inetaddr_notifier(&bond_inetaddr_notifier);
4972 out:
4973         return res;
4974 err:
4975         rtnl_link_unregister(&bond_link_ops);
4976 err_link:
4977         unregister_pernet_subsys(&bond_net_ops);
4978         goto out;
4979
4980 }
4981
4982 static void __exit bonding_exit(void)
4983 {
4984         unregister_netdevice_notifier(&bond_netdev_notifier);
4985         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4986
4987         bond_destroy_sysfs();
4988         bond_destroy_debugfs();
4989
4990         rtnl_link_unregister(&bond_link_ops);
4991         unregister_pernet_subsys(&bond_net_ops);
4992
4993 #ifdef CONFIG_NET_POLL_CONTROLLER
4994         /*
4995          * Make sure we don't have an imbalance on our netpoll blocking
4996          */
4997         WARN_ON(atomic_read(&netpoll_block_tx));
4998 #endif
4999 }
5000
5001 module_init(bonding_init);
5002 module_exit(bonding_exit);
5003 MODULE_LICENSE("GPL");
5004 MODULE_VERSION(DRV_VERSION);
5005 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5006 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5007 MODULE_ALIAS_RTNL_LINK("bond");