drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/ptrace.h>
  42 #include <linux/ioport.h>
  43 #include <linux/in.h>
  44 #include <net/ip.h>
  45 #include <linux/ip.h>
  46 #include <linux/tcp.h>
  47 #include <linux/udp.h>
  48 #include <linux/slab.h>
  49 #include <linux/string.h>
  50 #include <linux/init.h>
  51 #include <linux/timer.h>
  52 #include <linux/socket.h>
  53 #include <linux/ctype.h>
  54 #include <linux/inet.h>
  55 #include <linux/bitops.h>
  56 #include <linux/io.h>
  57 #include <asm/system.h>
  58 #include <asm/dma.h>
  59 #include <linux/uaccess.h>
  60 #include <linux/errno.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/netpoll.h>
  63 #include <linux/inetdevice.h>
  64 #include <linux/igmp.h>
  65 #include <linux/etherdevice.h>
  66 #include <linux/skbuff.h>
  67 #include <net/sock.h>
  68 #include <linux/rtnetlink.h>
  69 #include <linux/proc_fs.h>
  70 #include <linux/seq_file.h>
  71 #include <linux/smp.h>
  72 #include <linux/if_ether.h>
  73 #include <net/arp.h>
  74 #include <linux/mii.h>
  75 #include <linux/ethtool.h>
  76 #include <linux/if_vlan.h>
  77 #include <linux/if_bonding.h>
  78 #include <linux/jiffies.h>
  79 #include <net/route.h>
  80 #include <net/net_namespace.h>
  81 #include <net/netns/generic.h>
  82 #include "bonding.h"
  83 #include "bond_3ad.h"
  84 #include "bond_alb.h"
  85
  86 /*---------------------------- Module parameters ----------------------------*/
  87
  88 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  89 #define BOND_LINK_MON_INTERV    0
  90 #define BOND_LINK_ARP_INTERV    0
  91
  92 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  93 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  94 static int num_grat_arp = 1;
  95 static int num_unsol_na = 1;
  96 static int miimon       = BOND_LINK_MON_INTERV;
  97 static int updelay;
  98 static int downdelay;
  99 static int use_carrier  = 1;
 100 static char *mode;
 101 static char *primary;
 102 static char *primary_reselect;
 103 static char *lacp_rate;
 104 static char *ad_select;
 105 static char *xmit_hash_policy;
 106 static int arp_interval = BOND_LINK_ARP_INTERV;
 107 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 108 static char *arp_validate;
 109 static char *fail_over_mac;
 110 static int all_slaves_active = 0;
 111 static struct bond_params bonding_defaults;
 112
 113 module_param(max_bonds, int, 0);
 114 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 115 module_param(tx_queues, int, 0);
 116 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 117 module_param(num_grat_arp, int, 0644);
 118 MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
 119 module_param(num_unsol_na, int, 0644);
 120 MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
 121 module_param(miimon, int, 0);
 122 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 123 module_param(updelay, int, 0);
 124 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 125 module_param(downdelay, int, 0);
 126 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 127                             "in milliseconds");
 128 module_param(use_carrier, int, 0);
 129 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 130                               "0 for off, 1 for on (default)");
 131 module_param(mode, charp, 0);
 132 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 133                        "1 for active-backup, 2 for balance-xor, "
 134                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 135                        "6 for balance-alb");
 136 module_param(primary, charp, 0);
 137 MODULE_PARM_DESC(primary, "Primary network device to use");
 138 module_param(primary_reselect, charp, 0);
 139 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 140                                    "once it comes up; "
 141                                    "0 for always (default), "
 142                                    "1 for only if speed of primary is "
 143                                    "better, "
 144                                    "2 for only on active slave "
 145                                    "failure");
 146 module_param(lacp_rate, charp, 0);
 147 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 148                             "(slow/fast)");
 149 module_param(ad_select, charp, 0);
 150 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
 151 module_param(xmit_hash_policy, charp, 0);
 152 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 153                                    ", 1 for layer 3+4");
 154 module_param(arp_interval, int, 0);
 155 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 156 module_param_array(arp_ip_target, charp, NULL, 0);
 157 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 158 module_param(arp_validate, charp, 0);
 159 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 160 module_param(fail_over_mac, charp, 0);
 161 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
 162 module_param(all_slaves_active, int, 0);
 163 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 164                                      "by setting active flag for all slaves.  "
 165                                      "0 for never (default), 1 for always.");
 166
 167 /*----------------------------- Global variables ----------------------------*/
 168
 169 static const char * const version =
 170         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 171
 172 int bond_net_id __read_mostly;
 173
 174 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 175 static int arp_ip_count;
 176 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 177 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 178 static int lacp_fast;
 179 #ifdef CONFIG_NET_POLL_CONTROLLER
 180 static int disable_netpoll = 1;
 181 #endif
 182
 183 const struct bond_parm_tbl bond_lacp_tbl[] = {
 184 {       "slow",         AD_LACP_SLOW},
 185 {       "fast",         AD_LACP_FAST},
 186 {       NULL,           -1},
 187 };
 188
 189 const struct bond_parm_tbl bond_mode_tbl[] = {
 190 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 191 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 192 {       "balance-xor",          BOND_MODE_XOR},
 193 {       "broadcast",            BOND_MODE_BROADCAST},
 194 {       "802.3ad",              BOND_MODE_8023AD},
 195 {       "balance-tlb",          BOND_MODE_TLB},
 196 {       "balance-alb",          BOND_MODE_ALB},
 197 {       NULL,                   -1},
 198 };
 199
 200 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 201 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 202 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 203 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 204 {       NULL,                   -1},
 205 };
 206
 207 const struct bond_parm_tbl arp_validate_tbl[] = {
 208 {       "none",                 BOND_ARP_VALIDATE_NONE},
 209 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 210 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 211 {       "all",                  BOND_ARP_VALIDATE_ALL},
 212 {       NULL,                   -1},
 213 };
 214
 215 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 216 {       "none",                 BOND_FOM_NONE},
 217 {       "active",               BOND_FOM_ACTIVE},
 218 {       "follow",               BOND_FOM_FOLLOW},
 219 {       NULL,                   -1},
 220 };
 221
 222 const struct bond_parm_tbl pri_reselect_tbl[] = {
 223 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 224 {       "better",               BOND_PRI_RESELECT_BETTER},
 225 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 226 {       NULL,                   -1},
 227 };
 228
 229 struct bond_parm_tbl ad_select_tbl[] = {
 230 {       "stable",       BOND_AD_STABLE},
 231 {       "bandwidth",    BOND_AD_BANDWIDTH},
 232 {       "count",        BOND_AD_COUNT},
 233 {       NULL,           -1},
 234 };
 235
 236 /*-------------------------- Forward declarations ---------------------------*/
 237
 238 static void bond_send_gratuitous_arp(struct bonding *bond);
 239 static int bond_init(struct net_device *bond_dev);
 240 static void bond_uninit(struct net_device *bond_dev);
 241
 242 /*---------------------------- General routines -----------------------------*/
 243
 244 static const char *bond_mode_name(int mode)
 245 {
 246         static const char *names[] = {
 247                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 248                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 249                 [BOND_MODE_XOR] = "load balancing (xor)",
 250                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 251                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 252                 [BOND_MODE_TLB] = "transmit load balancing",
 253                 [BOND_MODE_ALB] = "adaptive load balancing",
 254         };
 255
 256         if (mode < 0 || mode > BOND_MODE_ALB)
 257                 return "unknown";
 258
 259         return names[mode];
 260 }
 261
 262 /*---------------------------------- VLAN -----------------------------------*/
 263
 264 /**
 265  * bond_add_vlan - add a new vlan id on bond
 266  * @bond: bond that got the notification
 267  * @vlan_id: the vlan id to add
 268  *
 269  * Returns -ENOMEM if allocation failed.
 270  */
 271 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 272 {
 273         struct vlan_entry *vlan;
 274
 275         pr_debug("bond: %s, vlan id %d\n",
 276                  (bond ? bond->dev->name : "None"), vlan_id);
 277
 278         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 279         if (!vlan)
 280                 return -ENOMEM;
 281
 282         INIT_LIST_HEAD(&vlan->vlan_list);
 283         vlan->vlan_id = vlan_id;
 284
 285         write_lock_bh(&bond->lock);
 286
 287         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 288
 289         write_unlock_bh(&bond->lock);
 290
 291         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 292
 293         return 0;
 294 }
 295
 296 /**
 297  * bond_del_vlan - delete a vlan id from bond
 298  * @bond: bond that got the notification
 299  * @vlan_id: the vlan id to delete
 300  *
 301  * returns -ENODEV if @vlan_id was not found in @bond.
 302  */
 303 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 304 {
 305         struct vlan_entry *vlan;
 306         int res = -ENODEV;
 307
 308         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 309
 310         write_lock_bh(&bond->lock);
 311
 312         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 313                 if (vlan->vlan_id == vlan_id) {
 314                         list_del(&vlan->vlan_list);
 315
 316                         if (bond_is_lb(bond))
 317                                 bond_alb_clear_vlan(bond, vlan_id);
 318
 319                         pr_debug("removed VLAN ID %d from bond %s\n",
 320                                  vlan_id, bond->dev->name);
 321
 322                         kfree(vlan);
 323
 324                         if (list_empty(&bond->vlan_list) &&
 325                             (bond->slave_cnt == 0)) {
 326                                 /* Last VLAN removed and no slaves, so
 327                                  * restore block on adding VLANs. This will
 328                                  * be removed once new slaves that are not
 329                                  * VLAN challenged will be added.
 330                                  */
 331                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 332                         }
 333
 334                         res = 0;
 335                         goto out;
 336                 }
 337         }
 338
 339         pr_debug("couldn't find VLAN ID %d in bond %s\n",
 340                  vlan_id, bond->dev->name);
 341
 342 out:
 343         write_unlock_bh(&bond->lock);
 344         return res;
 345 }
 346
 347 /**
 348  * bond_has_challenged_slaves
 349  * @bond: the bond we're working on
 350  *
 351  * Searches the slave list. Returns 1 if a vlan challenged slave
 352  * was found, 0 otherwise.
 353  *
 354  * Assumes bond->lock is held.
 355  */
 356 static int bond_has_challenged_slaves(struct bonding *bond)
 357 {
 358         struct slave *slave;
 359         int i;
 360
 361         bond_for_each_slave(bond, slave, i) {
 362                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 363                         pr_debug("found VLAN challenged slave - %s\n",
 364                                  slave->dev->name);
 365                         return 1;
 366                 }
 367         }
 368
 369         pr_debug("no VLAN challenged slaves found\n");
 370         return 0;
 371 }
 372
 373 /**
 374  * bond_next_vlan - safely skip to the next item in the vlans list.
 375  * @bond: the bond we're working on
 376  * @curr: item we're advancing from
 377  *
 378  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 379  * or @curr->next otherwise (even if it is @curr itself again).
 380  *
 381  * Caller must hold bond->lock
 382  */
 383 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 384 {
 385         struct vlan_entry *next, *last;
 386
 387         if (list_empty(&bond->vlan_list))
 388                 return NULL;
 389
 390         if (!curr) {
 391                 next = list_entry(bond->vlan_list.next,
 392                                   struct vlan_entry, vlan_list);
 393         } else {
 394                 last = list_entry(bond->vlan_list.prev,
 395                                   struct vlan_entry, vlan_list);
 396                 if (last == curr) {
 397                         next = list_entry(bond->vlan_list.next,
 398                                           struct vlan_entry, vlan_list);
 399                 } else {
 400                         next = list_entry(curr->vlan_list.next,
 401                                           struct vlan_entry, vlan_list);
 402                 }
 403         }
 404
 405         return next;
 406 }
 407
 408 /**
 409  * bond_dev_queue_xmit - Prepare skb for xmit.
 410  *
 411  * @bond: bond device that got this skb for tx.
 412  * @skb: hw accel VLAN tagged skb to transmit
 413  * @slave_dev: slave that is supposed to xmit this skbuff
 414  *
 415  * When the bond gets an skb to transmit that is
 416  * already hardware accelerated VLAN tagged, and it
 417  * needs to relay this skb to a slave that is not
 418  * hw accel capable, the skb needs to be "unaccelerated",
 419  * i.e. strip the hwaccel tag and re-insert it as part
 420  * of the payload.
 421  */
 422 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 423                         struct net_device *slave_dev)
 424 {
 425         unsigned short uninitialized_var(vlan_id);
 426
 427         /* Test vlan_list not vlgrp to catch and handle 802.1p tags */
 428         if (!list_empty(&bond->vlan_list) &&
 429             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 430             vlan_get_tag(skb, &vlan_id) == 0) {
 431                 skb->dev = slave_dev;
 432                 skb = vlan_put_tag(skb, vlan_id);
 433                 if (!skb) {
 434                         /* vlan_put_tag() frees the skb in case of error,
 435                          * so return success here so the calling functions
 436                          * won't attempt to free is again.
 437                          */
 438                         return 0;
 439                 }
 440         } else {
 441                 skb->dev = slave_dev;
 442         }
 443
 444         skb->priority = 1;
 445 #ifdef CONFIG_NET_POLL_CONTROLLER
 446         if (unlikely(bond->dev->priv_flags & IFF_IN_NETPOLL)) {
 447                 struct netpoll *np = bond->dev->npinfo->netpoll;
 448                 slave_dev->npinfo = bond->dev->npinfo;
 449                 np->real_dev = np->dev = skb->dev;
 450                 slave_dev->priv_flags |= IFF_IN_NETPOLL;
 451                 netpoll_send_skb(np, skb);
 452                 slave_dev->priv_flags &= ~IFF_IN_NETPOLL;
 453                 np->dev = bond->dev;
 454         } else
 455 #endif
 456                 dev_queue_xmit(skb);
 457
 458         return 0;
 459 }
 460
 461 /*
 462  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 463  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 464  * lock because:
 465  * a. This operation is performed in IOCTL context,
 466  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 467  * c. Holding a lock with BH disabled while directly calling a base driver
 468  *    entry point is generally a BAD idea.
 469  *
 470  * The design of synchronization/protection for this operation in the 8021q
 471  * module is good for one or more VLAN devices over a single physical device
 472  * and cannot be extended for a teaming solution like bonding, so there is a
 473  * potential race condition here where a net device from the vlan group might
 474  * be referenced (either by a base driver or the 8021q code) while it is being
 475  * removed from the system. However, it turns out we're not making matters
 476  * worse, and if it works for regular VLAN usage it will work here too.
 477 */
 478
 479 /**
 480  * bond_vlan_rx_register - Propagates registration to slaves
 481  * @bond_dev: bonding net device that got called
 482  * @grp: vlan group being registered
 483  */
 484 static void bond_vlan_rx_register(struct net_device *bond_dev,
 485                                   struct vlan_group *grp)
 486 {
 487         struct bonding *bond = netdev_priv(bond_dev);
 488         struct slave *slave;
 489         int i;
 490
 491         write_lock(&bond->lock);
 492         bond->vlgrp = grp;
 493         write_unlock(&bond->lock);
 494
 495         bond_for_each_slave(bond, slave, i) {
 496                 struct net_device *slave_dev = slave->dev;
 497                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 498
 499                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 500                     slave_ops->ndo_vlan_rx_register) {
 501                         slave_ops->ndo_vlan_rx_register(slave_dev, grp);
 502                 }
 503         }
 504 }
 505
 506 /**
 507  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 508  * @bond_dev: bonding net device that got called
 509  * @vid: vlan id being added
 510  */
 511 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 512 {
 513         struct bonding *bond = netdev_priv(bond_dev);
 514         struct slave *slave;
 515         int i, res;
 516
 517         bond_for_each_slave(bond, slave, i) {
 518                 struct net_device *slave_dev = slave->dev;
 519                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 520
 521                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 522                     slave_ops->ndo_vlan_rx_add_vid) {
 523                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
 524                 }
 525         }
 526
 527         res = bond_add_vlan(bond, vid);
 528         if (res) {
 529                 pr_err("%s: Error: Failed to add vlan id %d\n",
 530                        bond_dev->name, vid);
 531         }
 532 }
 533
 534 /**
 535  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 536  * @bond_dev: bonding net device that got called
 537  * @vid: vlan id being removed
 538  */
 539 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 540 {
 541         struct bonding *bond = netdev_priv(bond_dev);
 542         struct slave *slave;
 543         struct net_device *vlan_dev;
 544         int i, res;
 545
 546         bond_for_each_slave(bond, slave, i) {
 547                 struct net_device *slave_dev = slave->dev;
 548                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 549
 550                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 551                     slave_ops->ndo_vlan_rx_kill_vid) {
 552                         /* Save and then restore vlan_dev in the grp array,
 553                          * since the slave's driver might clear it.
 554                          */
 555                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
 556                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
 557                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
 558                 }
 559         }
 560
 561         res = bond_del_vlan(bond, vid);
 562         if (res) {
 563                 pr_err("%s: Error: Failed to remove vlan id %d\n",
 564                        bond_dev->name, vid);
 565         }
 566 }
 567
 568 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 569 {
 570         struct vlan_entry *vlan;
 571         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 572
 573         if (!bond->vlgrp)
 574                 return;
 575
 576         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 577             slave_ops->ndo_vlan_rx_register)
 578                 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
 579
 580         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 581             !(slave_ops->ndo_vlan_rx_add_vid))
 582                 return;
 583
 584         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
 585                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 586 }
 587
 588 static void bond_del_vlans_from_slave(struct bonding *bond,
 589                                       struct net_device *slave_dev)
 590 {
 591         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 592         struct vlan_entry *vlan;
 593         struct net_device *vlan_dev;
 594
 595         if (!bond->vlgrp)
 596                 return;
 597
 598         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 599             !(slave_ops->ndo_vlan_rx_kill_vid))
 600                 goto unreg;
 601
 602         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 603                 if (!vlan->vlan_id)
 604                         continue;
 605                 /* Save and then restore vlan_dev in the grp array,
 606                  * since the slave's driver might clear it.
 607                  */
 608                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
 609                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 610                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
 611         }
 612
 613 unreg:
 614         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 615             slave_ops->ndo_vlan_rx_register)
 616                 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
 617 }
 618
 619 /*------------------------------- Link status -------------------------------*/
 620
 621 /*
 622  * Set the carrier state for the master according to the state of its
 623  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 624  * do special 802.3ad magic.
 625  *
 626  * Returns zero if carrier state does not change, nonzero if it does.
 627  */
 628 static int bond_set_carrier(struct bonding *bond)
 629 {
 630         struct slave *slave;
 631         int i;
 632
 633         if (bond->slave_cnt == 0)
 634                 goto down;
 635
 636         if (bond->params.mode == BOND_MODE_8023AD)
 637                 return bond_3ad_set_carrier(bond);
 638
 639         bond_for_each_slave(bond, slave, i) {
 640                 if (slave->link == BOND_LINK_UP) {
 641                         if (!netif_carrier_ok(bond->dev)) {
 642                                 netif_carrier_on(bond->dev);
 643                                 return 1;
 644                         }
 645                         return 0;
 646                 }
 647         }
 648
 649 down:
 650         if (netif_carrier_ok(bond->dev)) {
 651                 netif_carrier_off(bond->dev);
 652                 return 1;
 653         }
 654         return 0;
 655 }
 656
 657 /*
 658  * Get link speed and duplex from the slave's base driver
 659  * using ethtool. If for some reason the call fails or the
 660  * values are invalid, fake speed and duplex to 100/Full
 661  * and return error.
 662  */
 663 static int bond_update_speed_duplex(struct slave *slave)
 664 {
 665         struct net_device *slave_dev = slave->dev;
 666         struct ethtool_cmd etool;
 667         int res;
 668
 669         /* Fake speed and duplex */
 670         slave->speed = SPEED_100;
 671         slave->duplex = DUPLEX_FULL;
 672
 673         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
 674                 return -1;
 675
 676         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 677         if (res < 0)
 678                 return -1;
 679
 680         switch (etool.speed) {
 681         case SPEED_10:
 682         case SPEED_100:
 683         case SPEED_1000:
 684         case SPEED_10000:
 685                 break;
 686         default:
 687                 return -1;
 688         }
 689
 690         switch (etool.duplex) {
 691         case DUPLEX_FULL:
 692         case DUPLEX_HALF:
 693                 break;
 694         default:
 695                 return -1;
 696         }
 697
 698         slave->speed = etool.speed;
 699         slave->duplex = etool.duplex;
 700
 701         return 0;
 702 }
 703
 704 /*
 705  * if <dev> supports MII link status reporting, check its link status.
 706  *
 707  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 708  * depending upon the setting of the use_carrier parameter.
 709  *
 710  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 711  * can't tell and just pretend it is), or 0, meaning that the link is
 712  * down.
 713  *
 714  * If reporting is non-zero, instead of faking link up, return -1 if
 715  * both ETHTOOL and MII ioctls fail (meaning the device does not
 716  * support them).  If use_carrier is set, return whatever it says.
 717  * It'd be nice if there was a good way to tell if a driver supports
 718  * netif_carrier, but there really isn't.
 719  */
 720 static int bond_check_dev_link(struct bonding *bond,
 721                                struct net_device *slave_dev, int reporting)
 722 {
 723         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 724         int (*ioctl)(struct net_device *, struct ifreq *, int);
 725         struct ifreq ifr;
 726         struct mii_ioctl_data *mii;
 727
 728         if (!reporting && !netif_running(slave_dev))
 729                 return 0;
 730
 731         if (bond->params.use_carrier)
 732                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 733
 734         /* Try to get link status using Ethtool first. */
 735         if (slave_dev->ethtool_ops) {
 736                 if (slave_dev->ethtool_ops->get_link) {
 737                         u32 link;
 738
 739                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 740
 741                         return link ? BMSR_LSTATUS : 0;
 742                 }
 743         }
 744
 745         /* Ethtool can't be used, fallback to MII ioctls. */
 746         ioctl = slave_ops->ndo_do_ioctl;
 747         if (ioctl) {
 748                 /* TODO: set pointer to correct ioctl on a per team member */
 749                 /*       bases to make this more efficient. that is, once  */
 750                 /*       we determine the correct ioctl, we will always    */
 751                 /*       call it and not the others for that team          */
 752                 /*       member.                                           */
 753
 754                 /*
 755                  * We cannot assume that SIOCGMIIPHY will also read a
 756                  * register; not all network drivers (e.g., e100)
 757                  * support that.
 758                  */
 759
 760                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 761                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 762                 mii = if_mii(&ifr);
 763                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 764                         mii->reg_num = MII_BMSR;
 765                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 766                                 return mii->val_out & BMSR_LSTATUS;
 767                 }
 768         }
 769
 770         /*
 771          * If reporting, report that either there's no dev->do_ioctl,
 772          * or both SIOCGMIIREG and get_link failed (meaning that we
 773          * cannot report link status).  If not reporting, pretend
 774          * we're ok.
 775          */
 776         return reporting ? -1 : BMSR_LSTATUS;
 777 }
 778
 779 /*----------------------------- Multicast list ------------------------------*/
 780
 781 /*
 782  * Push the promiscuity flag down to appropriate slaves
 783  */
 784 static int bond_set_promiscuity(struct bonding *bond, int inc)
 785 {
 786         int err = 0;
 787         if (USES_PRIMARY(bond->params.mode)) {
 788                 /* write lock already acquired */
 789                 if (bond->curr_active_slave) {
 790                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 791                                                   inc);
 792                 }
 793         } else {
 794                 struct slave *slave;
 795                 int i;
 796                 bond_for_each_slave(bond, slave, i) {
 797                         err = dev_set_promiscuity(slave->dev, inc);
 798                         if (err)
 799                                 return err;
 800                 }
 801         }
 802         return err;
 803 }
 804
 805 /*
 806  * Push the allmulti flag down to all slaves
 807  */
 808 static int bond_set_allmulti(struct bonding *bond, int inc)
 809 {
 810         int err = 0;
 811         if (USES_PRIMARY(bond->params.mode)) {
 812                 /* write lock already acquired */
 813                 if (bond->curr_active_slave) {
 814                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 815                                                inc);
 816                 }
 817         } else {
 818                 struct slave *slave;
 819                 int i;
 820                 bond_for_each_slave(bond, slave, i) {
 821                         err = dev_set_allmulti(slave->dev, inc);
 822                         if (err)
 823                                 return err;
 824                 }
 825         }
 826         return err;
 827 }
 828
 829 /*
 830  * Add a Multicast address to slaves
 831  * according to mode
 832  */
 833 static void bond_mc_add(struct bonding *bond, void *addr)
 834 {
 835         if (USES_PRIMARY(bond->params.mode)) {
 836                 /* write lock already acquired */
 837                 if (bond->curr_active_slave)
 838                         dev_mc_add(bond->curr_active_slave->dev, addr);
 839         } else {
 840                 struct slave *slave;
 841                 int i;
 842
 843                 bond_for_each_slave(bond, slave, i)
 844                         dev_mc_add(slave->dev, addr);
 845         }
 846 }
 847
 848 /*
 849  * Remove a multicast address from slave
 850  * according to mode
 851  */
 852 static void bond_mc_del(struct bonding *bond, void *addr)
 853 {
 854         if (USES_PRIMARY(bond->params.mode)) {
 855                 /* write lock already acquired */
 856                 if (bond->curr_active_slave)
 857                         dev_mc_del(bond->curr_active_slave->dev, addr);
 858         } else {
 859                 struct slave *slave;
 860                 int i;
 861                 bond_for_each_slave(bond, slave, i) {
 862                         dev_mc_del(slave->dev, addr);
 863                 }
 864         }
 865 }
 866
 867
 868 static void __bond_resend_igmp_join_requests(struct net_device *dev)
 869 {
 870         struct in_device *in_dev;
 871         struct ip_mc_list *im;
 872
 873         rcu_read_lock();
 874         in_dev = __in_dev_get_rcu(dev);
 875         if (in_dev) {
 876                 for (im = in_dev->mc_list; im; im = im->next)
 877                         ip_mc_rejoin_group(im);
 878         }
 879
 880         rcu_read_unlock();
 881 }
 882
 883 /*
 884  * Retrieve the list of registered multicast addresses for the bonding
 885  * device and retransmit an IGMP JOIN request to the current active
 886  * slave.
 887  */
 888 static void bond_resend_igmp_join_requests(struct bonding *bond)
 889 {
 890         struct net_device *vlan_dev;
 891         struct vlan_entry *vlan;
 892
 893         read_lock(&bond->lock);
 894
 895         /* rejoin all groups on bond device */
 896         __bond_resend_igmp_join_requests(bond->dev);
 897
 898         /* rejoin all groups on vlan devices */
 899         if (bond->vlgrp) {
 900                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 901                         vlan_dev = vlan_group_get_device(bond->vlgrp,
 902                                                          vlan->vlan_id);
 903                         if (vlan_dev)
 904                                 __bond_resend_igmp_join_requests(vlan_dev);
 905                 }
 906         }
 907
 908         read_unlock(&bond->lock);
 909 }
 910
 911 void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 912 {
 913         struct bonding *bond = container_of(work, struct bonding,
 914                                                         mcast_work.work);
 915         bond_resend_igmp_join_requests(bond);
 916 }
 917
 918 /*
 919  * flush all members of flush->mc_list from device dev->mc_list
 920  */
 921 static void bond_mc_list_flush(struct net_device *bond_dev,
 922                                struct net_device *slave_dev)
 923 {
 924         struct bonding *bond = netdev_priv(bond_dev);
 925         struct netdev_hw_addr *ha;
 926
 927         netdev_for_each_mc_addr(ha, bond_dev)
 928                 dev_mc_del(slave_dev, ha->addr);
 929
 930         if (bond->params.mode == BOND_MODE_8023AD) {
 931                 /* del lacpdu mc addr from mc list */
 932                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 933
 934                 dev_mc_del(slave_dev, lacpdu_multicast);
 935         }
 936 }
 937
 938 /*--------------------------- Active slave change ---------------------------*/
 939
 940 /*
 941  * Update the mc list and multicast-related flags for the new and
 942  * old active slaves (if any) according to the multicast mode, and
 943  * promiscuous flags unconditionally.
 944  */
 945 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
 946                          struct slave *old_active)
 947 {
 948         struct netdev_hw_addr *ha;
 949
 950         if (!USES_PRIMARY(bond->params.mode))
 951                 /* nothing to do -  mc list is already up-to-date on
 952                  * all slaves
 953                  */
 954                 return;
 955
 956         if (old_active) {
 957                 if (bond->dev->flags & IFF_PROMISC)
 958                         dev_set_promiscuity(old_active->dev, -1);
 959
 960                 if (bond->dev->flags & IFF_ALLMULTI)
 961                         dev_set_allmulti(old_active->dev, -1);
 962
 963                 netdev_for_each_mc_addr(ha, bond->dev)
 964                         dev_mc_del(old_active->dev, ha->addr);
 965         }
 966
 967         if (new_active) {
 968                 /* FIXME: Signal errors upstream. */
 969                 if (bond->dev->flags & IFF_PROMISC)
 970                         dev_set_promiscuity(new_active->dev, 1);
 971
 972                 if (bond->dev->flags & IFF_ALLMULTI)
 973                         dev_set_allmulti(new_active->dev, 1);
 974
 975                 netdev_for_each_mc_addr(ha, bond->dev)
 976                         dev_mc_add(new_active->dev, ha->addr);
 977         }
 978 }
 979
 980 /*
 981  * bond_do_fail_over_mac
 982  *
 983  * Perform special MAC address swapping for fail_over_mac settings
 984  *
 985  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 986  */
 987 static void bond_do_fail_over_mac(struct bonding *bond,
 988                                   struct slave *new_active,
 989                                   struct slave *old_active)
 990         __releases(&bond->curr_slave_lock)
 991         __releases(&bond->lock)
 992         __acquires(&bond->lock)
 993         __acquires(&bond->curr_slave_lock)
 994 {
 995         u8 tmp_mac[ETH_ALEN];
 996         struct sockaddr saddr;
 997         int rv;
 998
 999         switch (bond->params.fail_over_mac) {
1000         case BOND_FOM_ACTIVE:
1001                 if (new_active)
1002                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
1003                                new_active->dev->addr_len);
1004                 break;
1005         case BOND_FOM_FOLLOW:
1006                 /*
1007                  * if new_active && old_active, swap them
1008                  * if just old_active, do nothing (going to no active slave)
1009                  * if just new_active, set new_active to bond's MAC
1010                  */
1011                 if (!new_active)
1012                         return;
1013
1014                 write_unlock_bh(&bond->curr_slave_lock);
1015                 read_unlock(&bond->lock);
1016
1017                 if (old_active) {
1018                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1019                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
1020                                ETH_ALEN);
1021                         saddr.sa_family = new_active->dev->type;
1022                 } else {
1023                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1024                         saddr.sa_family = bond->dev->type;
1025                 }
1026
1027                 rv = dev_set_mac_address(new_active->dev, &saddr);
1028                 if (rv) {
1029                         pr_err("%s: Error %d setting MAC of slave %s\n",
1030                                bond->dev->name, -rv, new_active->dev->name);
1031                         goto out;
1032                 }
1033
1034                 if (!old_active)
1035                         goto out;
1036
1037                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1038                 saddr.sa_family = old_active->dev->type;
1039
1040                 rv = dev_set_mac_address(old_active->dev, &saddr);
1041                 if (rv)
1042                         pr_err("%s: Error %d setting MAC of slave %s\n",
1043                                bond->dev->name, -rv, new_active->dev->name);
1044 out:
1045                 read_lock(&bond->lock);
1046                 write_lock_bh(&bond->curr_slave_lock);
1047                 break;
1048         default:
1049                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
1050                        bond->dev->name, bond->params.fail_over_mac);
1051                 break;
1052         }
1053
1054 }
1055
1056 static bool bond_should_change_active(struct bonding *bond)
1057 {
1058         struct slave *prim = bond->primary_slave;
1059         struct slave *curr = bond->curr_active_slave;
1060
1061         if (!prim || !curr || curr->link != BOND_LINK_UP)
1062                 return true;
1063         if (bond->force_primary) {
1064                 bond->force_primary = false;
1065                 return true;
1066         }
1067         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
1068             (prim->speed < curr->speed ||
1069              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
1070                 return false;
1071         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
1072                 return false;
1073         return true;
1074 }
1075
1076 /**
1077  * find_best_interface - select the best available slave to be the active one
1078  * @bond: our bonding struct
1079  *
1080  * Warning: Caller must hold curr_slave_lock for writing.
1081  */
1082 static struct slave *bond_find_best_slave(struct bonding *bond)
1083 {
1084         struct slave *new_active, *old_active;
1085         struct slave *bestslave = NULL;
1086         int mintime = bond->params.updelay;
1087         int i;
1088
1089         new_active = bond->curr_active_slave;
1090
1091         if (!new_active) { /* there were no active slaves left */
1092                 if (bond->slave_cnt > 0)   /* found one slave */
1093                         new_active = bond->first_slave;
1094                 else
1095                         return NULL; /* still no slave, return NULL */
1096         }
1097
1098         if ((bond->primary_slave) &&
1099             bond->primary_slave->link == BOND_LINK_UP &&
1100             bond_should_change_active(bond)) {
1101                 new_active = bond->primary_slave;
1102         }
1103
1104         /* remember where to stop iterating over the slaves */
1105         old_active = new_active;
1106
1107         bond_for_each_slave_from(bond, new_active, i, old_active) {
1108                 if (new_active->link == BOND_LINK_UP) {
1109                         return new_active;
1110                 } else if (new_active->link == BOND_LINK_BACK &&
1111                            IS_UP(new_active->dev)) {
1112                         /* link up, but waiting for stabilization */
1113                         if (new_active->delay < mintime) {
1114                                 mintime = new_active->delay;
1115                                 bestslave = new_active;
1116                         }
1117                 }
1118         }
1119
1120         return bestslave;
1121 }
1122
1123 /**
1124  * change_active_interface - change the active slave into the specified one
1125  * @bond: our bonding struct
1126  * @new: the new slave to make the active one
1127  *
1128  * Set the new slave to the bond's settings and unset them on the old
1129  * curr_active_slave.
1130  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1131  *
1132  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1133  * because it is apparently the best available slave we have, even though its
1134  * updelay hasn't timed out yet.
1135  *
1136  * If new_active is not NULL, caller must hold bond->lock for read and
1137  * curr_slave_lock for write_bh.
1138  */
1139 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1140 {
1141         struct slave *old_active = bond->curr_active_slave;
1142
1143         if (old_active == new_active)
1144                 return;
1145
1146         if (new_active) {
1147                 new_active->jiffies = jiffies;
1148
1149                 if (new_active->link == BOND_LINK_BACK) {
1150                         if (USES_PRIMARY(bond->params.mode)) {
1151                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1152                                         bond->dev->name, new_active->dev->name,
1153                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1154                         }
1155
1156                         new_active->delay = 0;
1157                         new_active->link = BOND_LINK_UP;
1158
1159                         if (bond->params.mode == BOND_MODE_8023AD)
1160                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1161
1162                         if (bond_is_lb(bond))
1163                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1164                 } else {
1165                         if (USES_PRIMARY(bond->params.mode)) {
1166                                 pr_info("%s: making interface %s the new active one.\n",
1167                                         bond->dev->name, new_active->dev->name);
1168                         }
1169                 }
1170         }
1171
1172         if (USES_PRIMARY(bond->params.mode))
1173                 bond_mc_swap(bond, new_active, old_active);
1174
1175         if (bond_is_lb(bond)) {
1176                 bond_alb_handle_active_change(bond, new_active);
1177                 if (old_active)
1178                         bond_set_slave_inactive_flags(old_active);
1179                 if (new_active)
1180                         bond_set_slave_active_flags(new_active);
1181         } else {
1182                 bond->curr_active_slave = new_active;
1183         }
1184
1185         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1186                 if (old_active)
1187                         bond_set_slave_inactive_flags(old_active);
1188
1189                 if (new_active) {
1190                         bond_set_slave_active_flags(new_active);
1191
1192                         if (bond->params.fail_over_mac)
1193                                 bond_do_fail_over_mac(bond, new_active,
1194                                                       old_active);
1195
1196                         bond->send_grat_arp = bond->params.num_grat_arp;
1197                         bond_send_gratuitous_arp(bond);
1198
1199                         bond->send_unsol_na = bond->params.num_unsol_na;
1200                         bond_send_unsolicited_na(bond);
1201
1202                         write_unlock_bh(&bond->curr_slave_lock);
1203                         read_unlock(&bond->lock);
1204
1205                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1206
1207                         read_lock(&bond->lock);
1208                         write_lock_bh(&bond->curr_slave_lock);
1209                 }
1210         }
1211
1212         /* resend IGMP joins since active slave has changed or
1213          * all were sent on curr_active_slave */
1214         if ((USES_PRIMARY(bond->params.mode) && new_active) ||
1215             bond->params.mode == BOND_MODE_ROUNDROBIN) {
1216                 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1217         }
1218 }
1219
1220 /**
1221  * bond_select_active_slave - select a new active slave, if needed
1222  * @bond: our bonding struct
1223  *
1224  * This functions should be called when one of the following occurs:
1225  * - The old curr_active_slave has been released or lost its link.
1226  * - The primary_slave has got its link back.
1227  * - A slave has got its link back and there's no old curr_active_slave.
1228  *
1229  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1230  */
1231 void bond_select_active_slave(struct bonding *bond)
1232 {
1233         struct slave *best_slave;
1234         int rv;
1235
1236         best_slave = bond_find_best_slave(bond);
1237         if (best_slave != bond->curr_active_slave) {
1238                 bond_change_active_slave(bond, best_slave);
1239                 rv = bond_set_carrier(bond);
1240                 if (!rv)
1241                         return;
1242
1243                 if (netif_carrier_ok(bond->dev)) {
1244                         pr_info("%s: first active interface up!\n",
1245                                 bond->dev->name);
1246                 } else {
1247                         pr_info("%s: now running without any active interface !\n",
1248                                 bond->dev->name);
1249                 }
1250         }
1251 }
1252
1253 /*--------------------------- slave list handling ---------------------------*/
1254
1255 /*
1256  * This function attaches the slave to the end of list.
1257  *
1258  * bond->lock held for writing by caller.
1259  */
1260 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1261 {
1262         if (bond->first_slave == NULL) { /* attaching the first slave */
1263                 new_slave->next = new_slave;
1264                 new_slave->prev = new_slave;
1265                 bond->first_slave = new_slave;
1266         } else {
1267                 new_slave->next = bond->first_slave;
1268                 new_slave->prev = bond->first_slave->prev;
1269                 new_slave->next->prev = new_slave;
1270                 new_slave->prev->next = new_slave;
1271         }
1272
1273         bond->slave_cnt++;
1274 }
1275
1276 /*
1277  * This function detaches the slave from the list.
1278  * WARNING: no check is made to verify if the slave effectively
1279  * belongs to <bond>.
1280  * Nothing is freed on return, structures are just unchained.
1281  * If any slave pointer in bond was pointing to <slave>,
1282  * it should be changed by the calling function.
1283  *
1284  * bond->lock held for writing by caller.
1285  */
1286 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1287 {
1288         if (slave->next)
1289                 slave->next->prev = slave->prev;
1290
1291         if (slave->prev)
1292                 slave->prev->next = slave->next;
1293
1294         if (bond->first_slave == slave) { /* slave is the first slave */
1295                 if (bond->slave_cnt > 1) { /* there are more slave */
1296                         bond->first_slave = slave->next;
1297                 } else {
1298                         bond->first_slave = NULL; /* slave was the last one */
1299                 }
1300         }
1301
1302         slave->next = NULL;
1303         slave->prev = NULL;
1304         bond->slave_cnt--;
1305 }
1306
1307 #ifdef CONFIG_NET_POLL_CONTROLLER
1308 /*
1309  * You must hold read lock on bond->lock before calling this.
1310  */
1311 static bool slaves_support_netpoll(struct net_device *bond_dev)
1312 {
1313         struct bonding *bond = netdev_priv(bond_dev);
1314         struct slave *slave;
1315         int i = 0;
1316         bool ret = true;
1317
1318         bond_for_each_slave(bond, slave, i) {
1319                 if ((slave->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
1320                     !slave->dev->netdev_ops->ndo_poll_controller)
1321                         ret = false;
1322         }
1323         return i != 0 && ret;
1324 }
1325
1326 static void bond_poll_controller(struct net_device *bond_dev)
1327 {
1328         struct net_device *dev = bond_dev->npinfo->netpoll->real_dev;
1329         if (dev != bond_dev)
1330                 netpoll_poll_dev(dev);
1331 }
1332
1333 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1334 {
1335         struct bonding *bond = netdev_priv(bond_dev);
1336         struct slave *slave;
1337         const struct net_device_ops *ops;
1338         int i;
1339
1340         read_lock(&bond->lock);
1341         bond_dev->npinfo = NULL;
1342         bond_for_each_slave(bond, slave, i) {
1343                 if (slave->dev) {
1344                         ops = slave->dev->netdev_ops;
1345                         if (ops->ndo_netpoll_cleanup)
1346                                 ops->ndo_netpoll_cleanup(slave->dev);
1347                         else
1348                                 slave->dev->npinfo = NULL;
1349                 }
1350         }
1351         read_unlock(&bond->lock);
1352 }
1353
1354 #else
1355
1356 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1357 {
1358 }
1359
1360 #endif
1361
1362 /*---------------------------------- IOCTL ----------------------------------*/
1363
1364 static int bond_sethwaddr(struct net_device *bond_dev,
1365                           struct net_device *slave_dev)
1366 {
1367         pr_debug("bond_dev=%p\n", bond_dev);
1368         pr_debug("slave_dev=%p\n", slave_dev);
1369         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1370         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1371         return 0;
1372 }
1373
1374 #define BOND_VLAN_FEATURES \
1375         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1376          NETIF_F_HW_VLAN_FILTER)
1377
1378 /*
1379  * Compute the common dev->feature set available to all slaves.  Some
1380  * feature bits are managed elsewhere, so preserve those feature bits
1381  * on the master device.
1382  */
1383 static int bond_compute_features(struct bonding *bond)
1384 {
1385         struct slave *slave;
1386         struct net_device *bond_dev = bond->dev;
1387         unsigned long features = bond_dev->features;
1388         unsigned long vlan_features = 0;
1389         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1390                                                 bond_dev->hard_header_len);
1391         int i;
1392
1393         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1394         features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1395
1396         if (!bond->first_slave)
1397                 goto done;
1398
1399         features &= ~NETIF_F_ONE_FOR_ALL;
1400
1401         vlan_features = bond->first_slave->dev->vlan_features;
1402         bond_for_each_slave(bond, slave, i) {
1403                 features = netdev_increment_features(features,
1404                                                      slave->dev->features,
1405                                                      NETIF_F_ONE_FOR_ALL);
1406                 vlan_features = netdev_increment_features(vlan_features,
1407                                                         slave->dev->vlan_features,
1408                                                         NETIF_F_ONE_FOR_ALL);
1409                 if (slave->dev->hard_header_len > max_hard_header_len)
1410                         max_hard_header_len = slave->dev->hard_header_len;
1411         }
1412
1413 done:
1414         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1415         bond_dev->features = netdev_fix_features(features, NULL);
1416         bond_dev->vlan_features = netdev_fix_features(vlan_features, NULL);
1417         bond_dev->hard_header_len = max_hard_header_len;
1418
1419         return 0;
1420 }
1421
1422 static void bond_setup_by_slave(struct net_device *bond_dev,
1423                                 struct net_device *slave_dev)
1424 {
1425         struct bonding *bond = netdev_priv(bond_dev);
1426
1427         bond_dev->header_ops        = slave_dev->header_ops;
1428
1429         bond_dev->type              = slave_dev->type;
1430         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1431         bond_dev->addr_len          = slave_dev->addr_len;
1432
1433         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1434                 slave_dev->addr_len);
1435         bond->setup_by_slave = 1;
1436 }
1437
1438 /* enslave device <slave> to bond device <master> */
1439 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1440 {
1441         struct bonding *bond = netdev_priv(bond_dev);
1442         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1443         struct slave *new_slave = NULL;
1444         struct netdev_hw_addr *ha;
1445         struct sockaddr addr;
1446         int link_reporting;
1447         int old_features = bond_dev->features;
1448         int res = 0;
1449
1450         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1451                 slave_ops->ndo_do_ioctl == NULL) {
1452                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1453                            bond_dev->name, slave_dev->name);
1454         }
1455
1456         /* bond must be initialized by bond_open() before enslaving */
1457         if (!(bond_dev->flags & IFF_UP)) {
1458                 pr_warning("%s: master_dev is not up in bond_enslave\n",
1459                            bond_dev->name);
1460         }
1461
1462         /* already enslaved */
1463         if (slave_dev->flags & IFF_SLAVE) {
1464                 pr_debug("Error, Device was already enslaved\n");
1465                 return -EBUSY;
1466         }
1467
1468         /* vlan challenged mutual exclusion */
1469         /* no need to lock since we're protected by rtnl_lock */
1470         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1471                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1472                 if (bond->vlgrp) {
1473                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1474                                bond_dev->name, slave_dev->name, bond_dev->name);
1475                         return -EPERM;
1476                 } else {
1477                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1478                                    bond_dev->name, slave_dev->name,
1479                                    slave_dev->name, bond_dev->name);
1480                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1481                 }
1482         } else {
1483                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1484                 if (bond->slave_cnt == 0) {
1485                         /* First slave, and it is not VLAN challenged,
1486                          * so remove the block of adding VLANs over the bond.
1487                          */
1488                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1489                 }
1490         }
1491
1492         /*
1493          * Old ifenslave binaries are no longer supported.  These can
1494          * be identified with moderate accuracy by the state of the slave:
1495          * the current ifenslave will set the interface down prior to
1496          * enslaving it; the old ifenslave will not.
1497          */
1498         if ((slave_dev->flags & IFF_UP)) {
1499                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1500                        slave_dev->name);
1501                 res = -EPERM;
1502                 goto err_undo_flags;
1503         }
1504
1505         /* set bonding device ether type by slave - bonding netdevices are
1506          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1507          * there is a need to override some of the type dependent attribs/funcs.
1508          *
1509          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1510          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1511          */
1512         if (bond->slave_cnt == 0) {
1513                 if (bond_dev->type != slave_dev->type) {
1514                         pr_debug("%s: change device type from %d to %d\n",
1515                                  bond_dev->name,
1516                                  bond_dev->type, slave_dev->type);
1517
1518                         res = netdev_bonding_change(bond_dev,
1519                                                     NETDEV_PRE_TYPE_CHANGE);
1520                         res = notifier_to_errno(res);
1521                         if (res) {
1522                                 pr_err("%s: refused to change device type\n",
1523                                        bond_dev->name);
1524                                 res = -EBUSY;
1525                                 goto err_undo_flags;
1526                         }
1527
1528                         /* Flush unicast and multicast addresses */
1529                         dev_uc_flush(bond_dev);
1530                         dev_mc_flush(bond_dev);
1531
1532                         if (slave_dev->type != ARPHRD_ETHER)
1533                                 bond_setup_by_slave(bond_dev, slave_dev);
1534                         else
1535                                 ether_setup(bond_dev);
1536
1537                         netdev_bonding_change(bond_dev,
1538                                               NETDEV_POST_TYPE_CHANGE);
1539                 }
1540         } else if (bond_dev->type != slave_dev->type) {
1541                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1542                        slave_dev->name,
1543                        slave_dev->type, bond_dev->type);
1544                 res = -EINVAL;
1545                 goto err_undo_flags;
1546         }
1547
1548         if (slave_ops->ndo_set_mac_address == NULL) {
1549                 if (bond->slave_cnt == 0) {
1550                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1551                                    bond_dev->name);
1552                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1553                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1554                         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",
1555                                bond_dev->name);
1556                         res = -EOPNOTSUPP;
1557                         goto err_undo_flags;
1558                 }
1559         }
1560
1561         /* If this is the first slave, then we need to set the master's hardware
1562          * address to be the same as the slave's. */
1563         if (bond->slave_cnt == 0)
1564                 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1565                        slave_dev->addr_len);
1566
1567
1568         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1569         if (!new_slave) {
1570                 res = -ENOMEM;
1571                 goto err_undo_flags;
1572         }
1573
1574         /*
1575          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1576          * is set via sysfs or module option if desired.
1577          */
1578         new_slave->queue_id = 0;
1579
1580         /* Save slave's original mtu and then set it to match the bond */
1581         new_slave->original_mtu = slave_dev->mtu;
1582         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1583         if (res) {
1584                 pr_debug("Error %d calling dev_set_mtu\n", res);
1585                 goto err_free;
1586         }
1587
1588         /*
1589          * Save slave's original ("permanent") mac address for modes
1590          * that need it, and for restoring it upon release, and then
1591          * set it to the master's address
1592          */
1593         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1594
1595         if (!bond->params.fail_over_mac) {
1596                 /*
1597                  * Set slave to master's mac address.  The application already
1598                  * set the master's mac address to that of the first slave
1599                  */
1600                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1601                 addr.sa_family = slave_dev->type;
1602                 res = dev_set_mac_address(slave_dev, &addr);
1603                 if (res) {
1604                         pr_debug("Error %d calling set_mac_address\n", res);
1605                         goto err_restore_mtu;
1606                 }
1607         }
1608
1609         res = netdev_set_master(slave_dev, bond_dev);
1610         if (res) {
1611                 pr_debug("Error %d calling netdev_set_master\n", res);
1612                 goto err_restore_mac;
1613         }
1614         /* open the slave since the application closed it */
1615         res = dev_open(slave_dev);
1616         if (res) {
1617                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1618                 goto err_unset_master;
1619         }
1620
1621         new_slave->dev = slave_dev;
1622         slave_dev->priv_flags |= IFF_BONDING;
1623
1624         if (bond_is_lb(bond)) {
1625                 /* bond_alb_init_slave() must be called before all other stages since
1626                  * it might fail and we do not want to have to undo everything
1627                  */
1628                 res = bond_alb_init_slave(bond, new_slave);
1629                 if (res)
1630                         goto err_close;
1631         }
1632
1633         /* If the mode USES_PRIMARY, then the new slave gets the
1634          * master's promisc (and mc) settings only if it becomes the
1635          * curr_active_slave, and that is taken care of later when calling
1636          * bond_change_active()
1637          */
1638         if (!USES_PRIMARY(bond->params.mode)) {
1639                 /* set promiscuity level to new slave */
1640                 if (bond_dev->flags & IFF_PROMISC) {
1641                         res = dev_set_promiscuity(slave_dev, 1);
1642                         if (res)
1643                                 goto err_close;
1644                 }
1645
1646                 /* set allmulti level to new slave */
1647                 if (bond_dev->flags & IFF_ALLMULTI) {
1648                         res = dev_set_allmulti(slave_dev, 1);
1649                         if (res)
1650                                 goto err_close;
1651                 }
1652
1653                 netif_addr_lock_bh(bond_dev);
1654                 /* upload master's mc_list to new slave */
1655                 netdev_for_each_mc_addr(ha, bond_dev)
1656                         dev_mc_add(slave_dev, ha->addr);
1657                 netif_addr_unlock_bh(bond_dev);
1658         }
1659
1660         if (bond->params.mode == BOND_MODE_8023AD) {
1661                 /* add lacpdu mc addr to mc list */
1662                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1663
1664                 dev_mc_add(slave_dev, lacpdu_multicast);
1665         }
1666
1667         bond_add_vlans_on_slave(bond, slave_dev);
1668
1669         write_lock_bh(&bond->lock);
1670
1671         bond_attach_slave(bond, new_slave);
1672
1673         new_slave->delay = 0;
1674         new_slave->link_failure_count = 0;
1675
1676         bond_compute_features(bond);
1677
1678         write_unlock_bh(&bond->lock);
1679
1680         read_lock(&bond->lock);
1681
1682         new_slave->last_arp_rx = jiffies;
1683
1684         if (bond->params.miimon && !bond->params.use_carrier) {
1685                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1686
1687                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1688                         /*
1689                          * miimon is set but a bonded network driver
1690                          * does not support ETHTOOL/MII and
1691                          * arp_interval is not set.  Note: if
1692                          * use_carrier is enabled, we will never go
1693                          * here (because netif_carrier is always
1694                          * supported); thus, we don't need to change
1695                          * the messages for netif_carrier.
1696                          */
1697                         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",
1698                                bond_dev->name, slave_dev->name);
1699                 } else if (link_reporting == -1) {
1700                         /* unable get link status using mii/ethtool */
1701                         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",
1702                                    bond_dev->name, slave_dev->name);
1703                 }
1704         }
1705
1706         /* check for initial state */
1707         if (!bond->params.miimon ||
1708             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1709                 if (bond->params.updelay) {
1710                         pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1711                         new_slave->link  = BOND_LINK_BACK;
1712                         new_slave->delay = bond->params.updelay;
1713                 } else {
1714                         pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1715                         new_slave->link  = BOND_LINK_UP;
1716                 }
1717                 new_slave->jiffies = jiffies;
1718         } else {
1719                 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1720                 new_slave->link  = BOND_LINK_DOWN;
1721         }
1722
1723         if (bond_update_speed_duplex(new_slave) &&
1724             (new_slave->link != BOND_LINK_DOWN)) {
1725                 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n",
1726                            bond_dev->name, new_slave->dev->name);
1727
1728                 if (bond->params.mode == BOND_MODE_8023AD) {
1729                         pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n",
1730                                    bond_dev->name);
1731                 }
1732         }
1733
1734         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1735                 /* if there is a primary slave, remember it */
1736                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1737                         bond->primary_slave = new_slave;
1738                         bond->force_primary = true;
1739                 }
1740         }
1741
1742         write_lock_bh(&bond->curr_slave_lock);
1743
1744         switch (bond->params.mode) {
1745         case BOND_MODE_ACTIVEBACKUP:
1746                 bond_set_slave_inactive_flags(new_slave);
1747                 bond_select_active_slave(bond);
1748                 break;
1749         case BOND_MODE_8023AD:
1750                 /* in 802.3ad mode, the internal mechanism
1751                  * will activate the slaves in the selected
1752                  * aggregator
1753                  */
1754                 bond_set_slave_inactive_flags(new_slave);
1755                 /* if this is the first slave */
1756                 if (bond->slave_cnt == 1) {
1757                         SLAVE_AD_INFO(new_slave).id = 1;
1758                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1759                          * can be called only after the mac address of the bond is set
1760                          */
1761                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1762                                             bond->params.lacp_fast);
1763                 } else {
1764                         SLAVE_AD_INFO(new_slave).id =
1765                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1766                 }
1767
1768                 bond_3ad_bind_slave(new_slave);
1769                 break;
1770         case BOND_MODE_TLB:
1771         case BOND_MODE_ALB:
1772                 new_slave->state = BOND_STATE_ACTIVE;
1773                 bond_set_slave_inactive_flags(new_slave);
1774                 bond_select_active_slave(bond);
1775                 break;
1776         default:
1777                 pr_debug("This slave is always active in trunk mode\n");
1778
1779                 /* always active in trunk mode */
1780                 new_slave->state = BOND_STATE_ACTIVE;
1781
1782                 /* In trunking mode there is little meaning to curr_active_slave
1783                  * anyway (it holds no special properties of the bond device),
1784                  * so we can change it without calling change_active_interface()
1785                  */
1786                 if (!bond->curr_active_slave)
1787                         bond->curr_active_slave = new_slave;
1788
1789                 break;
1790         } /* switch(bond_mode) */
1791
1792         write_unlock_bh(&bond->curr_slave_lock);
1793
1794         bond_set_carrier(bond);
1795
1796 #ifdef CONFIG_NET_POLL_CONTROLLER
1797         /*
1798          * Netpoll and bonding is broken, make sure it is not initialized
1799          * until it is fixed.
1800          */
1801         if (disable_netpoll) {
1802                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1803         } else {
1804                 if (slaves_support_netpoll(bond_dev)) {
1805                         bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
1806                         if (bond_dev->npinfo)
1807                                 slave_dev->npinfo = bond_dev->npinfo;
1808                 } else if (!(bond_dev->priv_flags & IFF_DISABLE_NETPOLL)) {
1809                         bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1810                         pr_info("New slave device %s does not support netpoll\n",
1811                                 slave_dev->name);
1812                         pr_info("Disabling netpoll support for %s\n", bond_dev->name);
1813                 }
1814         }
1815 #endif
1816         read_unlock(&bond->lock);
1817
1818         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1819         if (res)
1820                 goto err_close;
1821
1822         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1823                 bond_dev->name, slave_dev->name,
1824                 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1825                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1826
1827         /* enslave is successful */
1828         return 0;
1829
1830 /* Undo stages on error */
1831 err_close:
1832         dev_close(slave_dev);
1833
1834 err_unset_master:
1835         netdev_set_master(slave_dev, NULL);
1836
1837 err_restore_mac:
1838         if (!bond->params.fail_over_mac) {
1839                 /* XXX TODO - fom follow mode needs to change master's
1840                  * MAC if this slave's MAC is in use by the bond, or at
1841                  * least print a warning.
1842                  */
1843                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1844                 addr.sa_family = slave_dev->type;
1845                 dev_set_mac_address(slave_dev, &addr);
1846         }
1847
1848 err_restore_mtu:
1849         dev_set_mtu(slave_dev, new_slave->original_mtu);
1850
1851 err_free:
1852         kfree(new_slave);
1853
1854 err_undo_flags:
1855         bond_dev->features = old_features;
1856
1857         return res;
1858 }
1859
1860 /*
1861  * Try to release the slave device <slave> from the bond device <master>
1862  * It is legal to access curr_active_slave without a lock because all the function
1863  * is write-locked.
1864  *
1865  * The rules for slave state should be:
1866  *   for Active/Backup:
1867  *     Active stays on all backups go down
1868  *   for Bonded connections:
1869  *     The first up interface should be left on and all others downed.
1870  */
1871 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1872 {
1873         struct bonding *bond = netdev_priv(bond_dev);
1874         struct slave *slave, *oldcurrent;
1875         struct sockaddr addr;
1876
1877         /* slave is not a slave or master is not master of this slave */
1878         if (!(slave_dev->flags & IFF_SLAVE) ||
1879             (slave_dev->master != bond_dev)) {
1880                 pr_err("%s: Error: cannot release %s.\n",
1881                        bond_dev->name, slave_dev->name);
1882                 return -EINVAL;
1883         }
1884
1885         netdev_bonding_change(bond_dev, NETDEV_BONDING_DESLAVE);
1886         write_lock_bh(&bond->lock);
1887
1888         slave = bond_get_slave_by_dev(bond, slave_dev);
1889         if (!slave) {
1890                 /* not a slave of this bond */
1891                 pr_info("%s: %s not enslaved\n",
1892                         bond_dev->name, slave_dev->name);
1893                 write_unlock_bh(&bond->lock);
1894                 return -EINVAL;
1895         }
1896
1897         if (!bond->params.fail_over_mac) {
1898                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1899                     bond->slave_cnt > 1)
1900                         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",
1901                                    bond_dev->name, slave_dev->name,
1902                                    slave->perm_hwaddr,
1903                                    bond_dev->name, slave_dev->name);
1904         }
1905
1906         /* Inform AD package of unbinding of slave. */
1907         if (bond->params.mode == BOND_MODE_8023AD) {
1908                 /* must be called before the slave is
1909                  * detached from the list
1910                  */
1911                 bond_3ad_unbind_slave(slave);
1912         }
1913
1914         pr_info("%s: releasing %s interface %s\n",
1915                 bond_dev->name,
1916                 (slave->state == BOND_STATE_ACTIVE) ? "active" : "backup",
1917                 slave_dev->name);
1918
1919         oldcurrent = bond->curr_active_slave;
1920
1921         bond->current_arp_slave = NULL;
1922
1923         /* release the slave from its bond */
1924         bond_detach_slave(bond, slave);
1925
1926         bond_compute_features(bond);
1927
1928         if (bond->primary_slave == slave)
1929                 bond->primary_slave = NULL;
1930
1931         if (oldcurrent == slave)
1932                 bond_change_active_slave(bond, NULL);
1933
1934         if (bond_is_lb(bond)) {
1935                 /* Must be called only after the slave has been
1936                  * detached from the list and the curr_active_slave
1937                  * has been cleared (if our_slave == old_current),
1938                  * but before a new active slave is selected.
1939                  */
1940                 write_unlock_bh(&bond->lock);
1941                 bond_alb_deinit_slave(bond, slave);
1942                 write_lock_bh(&bond->lock);
1943         }
1944
1945         if (oldcurrent == slave) {
1946                 /*
1947                  * Note that we hold RTNL over this sequence, so there
1948                  * is no concern that another slave add/remove event
1949                  * will interfere.
1950                  */
1951                 write_unlock_bh(&bond->lock);
1952                 read_lock(&bond->lock);
1953                 write_lock_bh(&bond->curr_slave_lock);
1954
1955                 bond_select_active_slave(bond);
1956
1957                 write_unlock_bh(&bond->curr_slave_lock);
1958                 read_unlock(&bond->lock);
1959                 write_lock_bh(&bond->lock);
1960         }
1961
1962         if (bond->slave_cnt == 0) {
1963                 bond_set_carrier(bond);
1964
1965                 /* if the last slave was removed, zero the mac address
1966                  * of the master so it will be set by the application
1967                  * to the mac address of the first slave
1968                  */
1969                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1970
1971                 if (!bond->vlgrp) {
1972                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1973                 } else {
1974                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1975                                    bond_dev->name, bond_dev->name);
1976                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1977                                    bond_dev->name);
1978                 }
1979         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1980                    !bond_has_challenged_slaves(bond)) {
1981                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1982                         bond_dev->name, slave_dev->name, bond_dev->name);
1983                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1984         }
1985
1986         write_unlock_bh(&bond->lock);
1987
1988         /* must do this from outside any spinlocks */
1989         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1990
1991         bond_del_vlans_from_slave(bond, slave_dev);
1992
1993         /* If the mode USES_PRIMARY, then we should only remove its
1994          * promisc and mc settings if it was the curr_active_slave, but that was
1995          * already taken care of above when we detached the slave
1996          */
1997         if (!USES_PRIMARY(bond->params.mode)) {
1998                 /* unset promiscuity level from slave */
1999                 if (bond_dev->flags & IFF_PROMISC)
2000                         dev_set_promiscuity(slave_dev, -1);
2001
2002                 /* unset allmulti level from slave */
2003                 if (bond_dev->flags & IFF_ALLMULTI)
2004                         dev_set_allmulti(slave_dev, -1);
2005
2006                 /* flush master's mc_list from slave */
2007                 netif_addr_lock_bh(bond_dev);
2008                 bond_mc_list_flush(bond_dev, slave_dev);
2009                 netif_addr_unlock_bh(bond_dev);
2010         }
2011
2012         netdev_set_master(slave_dev, NULL);
2013
2014 #ifdef CONFIG_NET_POLL_CONTROLLER
2015         read_lock_bh(&bond->lock);
2016
2017          /* Make sure netpoll over stays disabled until fixed. */
2018         if (!disable_netpoll)
2019                 if (slaves_support_netpoll(bond_dev))
2020                                 bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
2021         read_unlock_bh(&bond->lock);
2022         if (slave_dev->netdev_ops->ndo_netpoll_cleanup)
2023                 slave_dev->netdev_ops->ndo_netpoll_cleanup(slave_dev);
2024         else
2025                 slave_dev->npinfo = NULL;
2026 #endif
2027
2028         /* close slave before restoring its mac address */
2029         dev_close(slave_dev);
2030
2031         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2032                 /* restore original ("permanent") mac address */
2033                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2034                 addr.sa_family = slave_dev->type;
2035                 dev_set_mac_address(slave_dev, &addr);
2036         }
2037
2038         dev_set_mtu(slave_dev, slave->original_mtu);
2039
2040         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2041                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
2042                                    IFF_SLAVE_NEEDARP);
2043
2044         kfree(slave);
2045
2046         return 0;  /* deletion OK */
2047 }
2048
2049 /*
2050 * First release a slave and than destroy the bond if no more slaves are left.
2051 * Must be under rtnl_lock when this function is called.
2052 */
2053 int  bond_release_and_destroy(struct net_device *bond_dev,
2054                               struct net_device *slave_dev)
2055 {
2056         struct bonding *bond = netdev_priv(bond_dev);
2057         int ret;
2058
2059         ret = bond_release(bond_dev, slave_dev);
2060         if ((ret == 0) && (bond->slave_cnt == 0)) {
2061                 pr_info("%s: destroying bond %s.\n",
2062                         bond_dev->name, bond_dev->name);
2063                 unregister_netdevice(bond_dev);
2064         }
2065         return ret;
2066 }
2067
2068 /*
2069  * This function releases all slaves.
2070  */
2071 static int bond_release_all(struct net_device *bond_dev)
2072 {
2073         struct bonding *bond = netdev_priv(bond_dev);
2074         struct slave *slave;
2075         struct net_device *slave_dev;
2076         struct sockaddr addr;
2077
2078         write_lock_bh(&bond->lock);
2079
2080         netif_carrier_off(bond_dev);
2081
2082         if (bond->slave_cnt == 0)
2083                 goto out;
2084
2085         bond->current_arp_slave = NULL;
2086         bond->primary_slave = NULL;
2087         bond_change_active_slave(bond, NULL);
2088
2089         while ((slave = bond->first_slave) != NULL) {
2090                 /* Inform AD package of unbinding of slave
2091                  * before slave is detached from the list.
2092                  */
2093                 if (bond->params.mode == BOND_MODE_8023AD)
2094                         bond_3ad_unbind_slave(slave);
2095
2096                 slave_dev = slave->dev;
2097                 bond_detach_slave(bond, slave);
2098
2099                 /* now that the slave is detached, unlock and perform
2100                  * all the undo steps that should not be called from
2101                  * within a lock.
2102                  */
2103                 write_unlock_bh(&bond->lock);
2104
2105                 if (bond_is_lb(bond)) {
2106                         /* must be called only after the slave
2107                          * has been detached from the list
2108                          */
2109                         bond_alb_deinit_slave(bond, slave);
2110                 }
2111
2112                 bond_compute_features(bond);
2113
2114                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2115                 bond_del_vlans_from_slave(bond, slave_dev);
2116
2117                 /* If the mode USES_PRIMARY, then we should only remove its
2118                  * promisc and mc settings if it was the curr_active_slave, but that was
2119                  * already taken care of above when we detached the slave
2120                  */
2121                 if (!USES_PRIMARY(bond->params.mode)) {
2122                         /* unset promiscuity level from slave */
2123                         if (bond_dev->flags & IFF_PROMISC)
2124                                 dev_set_promiscuity(slave_dev, -1);
2125
2126                         /* unset allmulti level from slave */
2127                         if (bond_dev->flags & IFF_ALLMULTI)
2128                                 dev_set_allmulti(slave_dev, -1);
2129
2130                         /* flush master's mc_list from slave */
2131                         netif_addr_lock_bh(bond_dev);
2132                         bond_mc_list_flush(bond_dev, slave_dev);
2133                         netif_addr_unlock_bh(bond_dev);
2134                 }
2135
2136                 netdev_set_master(slave_dev, NULL);
2137
2138                 /* close slave before restoring its mac address */
2139                 dev_close(slave_dev);
2140
2141                 if (!bond->params.fail_over_mac) {
2142                         /* restore original ("permanent") mac address*/
2143                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2144                         addr.sa_family = slave_dev->type;
2145                         dev_set_mac_address(slave_dev, &addr);
2146                 }
2147
2148                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2149                                            IFF_SLAVE_INACTIVE);
2150
2151                 kfree(slave);
2152
2153                 /* re-acquire the lock before getting the next slave */
2154                 write_lock_bh(&bond->lock);
2155         }
2156
2157         /* zero the mac address of the master so it will be
2158          * set by the application to the mac address of the
2159          * first slave
2160          */
2161         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2162
2163         if (!bond->vlgrp) {
2164                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2165         } else {
2166                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2167                            bond_dev->name, bond_dev->name);
2168                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2169                            bond_dev->name);
2170         }
2171
2172         pr_info("%s: released all slaves\n", bond_dev->name);
2173
2174 out:
2175         write_unlock_bh(&bond->lock);
2176
2177         return 0;
2178 }
2179
2180 /*
2181  * This function changes the active slave to slave <slave_dev>.
2182  * It returns -EINVAL in the following cases.
2183  *  - <slave_dev> is not found in the list.
2184  *  - There is not active slave now.
2185  *  - <slave_dev> is already active.
2186  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2187  *  - <slave_dev> is not running.
2188  * In these cases, this function does nothing.
2189  * In the other cases, current_slave pointer is changed and 0 is returned.
2190  */
2191 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2192 {
2193         struct bonding *bond = netdev_priv(bond_dev);
2194         struct slave *old_active = NULL;
2195         struct slave *new_active = NULL;
2196         int res = 0;
2197
2198         if (!USES_PRIMARY(bond->params.mode))
2199                 return -EINVAL;
2200
2201         /* Verify that master_dev is indeed the master of slave_dev */
2202         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2203                 return -EINVAL;
2204
2205         read_lock(&bond->lock);
2206
2207         read_lock(&bond->curr_slave_lock);
2208         old_active = bond->curr_active_slave;
2209         read_unlock(&bond->curr_slave_lock);
2210
2211         new_active = bond_get_slave_by_dev(bond, slave_dev);
2212
2213         /*
2214          * Changing to the current active: do nothing; return success.
2215          */
2216         if (new_active && (new_active == old_active)) {
2217                 read_unlock(&bond->lock);
2218                 return 0;
2219         }
2220
2221         if ((new_active) &&
2222             (old_active) &&
2223             (new_active->link == BOND_LINK_UP) &&
2224             IS_UP(new_active->dev)) {
2225                 write_lock_bh(&bond->curr_slave_lock);
2226                 bond_change_active_slave(bond, new_active);
2227                 write_unlock_bh(&bond->curr_slave_lock);
2228         } else
2229                 res = -EINVAL;
2230
2231         read_unlock(&bond->lock);
2232
2233         return res;
2234 }
2235
2236 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2237 {
2238         struct bonding *bond = netdev_priv(bond_dev);
2239
2240         info->bond_mode = bond->params.mode;
2241         info->miimon = bond->params.miimon;
2242
2243         read_lock(&bond->lock);
2244         info->num_slaves = bond->slave_cnt;
2245         read_unlock(&bond->lock);
2246
2247         return 0;
2248 }
2249
2250 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2251 {
2252         struct bonding *bond = netdev_priv(bond_dev);
2253         struct slave *slave;
2254         int i, res = -ENODEV;
2255
2256         read_lock(&bond->lock);
2257
2258         bond_for_each_slave(bond, slave, i) {
2259                 if (i == (int)info->slave_id) {
2260                         res = 0;
2261                         strcpy(info->slave_name, slave->dev->name);
2262                         info->link = slave->link;
2263                         info->state = slave->state;
2264                         info->link_failure_count = slave->link_failure_count;
2265                         break;
2266                 }
2267         }
2268
2269         read_unlock(&bond->lock);
2270
2271         return res;
2272 }
2273
2274 /*-------------------------------- Monitoring -------------------------------*/
2275
2276
2277 static int bond_miimon_inspect(struct bonding *bond)
2278 {
2279         struct slave *slave;
2280         int i, link_state, commit = 0;
2281         bool ignore_updelay;
2282
2283         ignore_updelay = !bond->curr_active_slave ? true : false;
2284
2285         bond_for_each_slave(bond, slave, i) {
2286                 slave->new_link = BOND_LINK_NOCHANGE;
2287
2288                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2289
2290                 switch (slave->link) {
2291                 case BOND_LINK_UP:
2292                         if (link_state)
2293                                 continue;
2294
2295                         slave->link = BOND_LINK_FAIL;
2296                         slave->delay = bond->params.downdelay;
2297                         if (slave->delay) {
2298                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2299                                         bond->dev->name,
2300                                         (bond->params.mode ==
2301                                          BOND_MODE_ACTIVEBACKUP) ?
2302                                         ((slave->state == BOND_STATE_ACTIVE) ?
2303                                          "active " : "backup ") : "",
2304                                         slave->dev->name,
2305                                         bond->params.downdelay * bond->params.miimon);
2306                         }
2307                         /*FALLTHRU*/
2308                 case BOND_LINK_FAIL:
2309                         if (link_state) {
2310                                 /*
2311                                  * recovered before downdelay expired
2312                                  */
2313                                 slave->link = BOND_LINK_UP;
2314                                 slave->jiffies = jiffies;
2315                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2316                                         bond->dev->name,
2317                                         (bond->params.downdelay - slave->delay) *
2318                                         bond->params.miimon,
2319                                         slave->dev->name);
2320                                 continue;
2321                         }
2322
2323                         if (slave->delay <= 0) {
2324                                 slave->new_link = BOND_LINK_DOWN;
2325                                 commit++;
2326                                 continue;
2327                         }
2328
2329                         slave->delay--;
2330                         break;
2331
2332                 case BOND_LINK_DOWN:
2333                         if (!link_state)
2334                                 continue;
2335
2336                         slave->link = BOND_LINK_BACK;
2337                         slave->delay = bond->params.updelay;
2338
2339                         if (slave->delay) {
2340                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2341                                         bond->dev->name, slave->dev->name,
2342                                         ignore_updelay ? 0 :
2343                                         bond->params.updelay *
2344                                         bond->params.miimon);
2345                         }
2346                         /*FALLTHRU*/
2347                 case BOND_LINK_BACK:
2348                         if (!link_state) {
2349                                 slave->link = BOND_LINK_DOWN;
2350                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2351                                         bond->dev->name,
2352                                         (bond->params.updelay - slave->delay) *
2353                                         bond->params.miimon,
2354                                         slave->dev->name);
2355
2356                                 continue;
2357                         }
2358
2359                         if (ignore_updelay)
2360                                 slave->delay = 0;
2361
2362                         if (slave->delay <= 0) {
2363                                 slave->new_link = BOND_LINK_UP;
2364                                 commit++;
2365                                 ignore_updelay = false;
2366                                 continue;
2367                         }
2368
2369                         slave->delay--;
2370                         break;
2371                 }
2372         }
2373
2374         return commit;
2375 }
2376
2377 static void bond_miimon_commit(struct bonding *bond)
2378 {
2379         struct slave *slave;
2380         int i;
2381
2382         bond_for_each_slave(bond, slave, i) {
2383                 switch (slave->new_link) {
2384                 case BOND_LINK_NOCHANGE:
2385                         continue;
2386
2387                 case BOND_LINK_UP:
2388                         slave->link = BOND_LINK_UP;
2389                         slave->jiffies = jiffies;
2390
2391                         if (bond->params.mode == BOND_MODE_8023AD) {
2392                                 /* prevent it from being the active one */
2393                                 slave->state = BOND_STATE_BACKUP;
2394                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2395                                 /* make it immediately active */
2396                                 slave->state = BOND_STATE_ACTIVE;
2397                         } else if (slave != bond->primary_slave) {
2398                                 /* prevent it from being the active one */
2399                                 slave->state = BOND_STATE_BACKUP;
2400                         }
2401
2402                         pr_info("%s: link status definitely up for interface %s.\n",
2403                                 bond->dev->name, slave->dev->name);
2404
2405                         /* notify ad that the link status has changed */
2406                         if (bond->params.mode == BOND_MODE_8023AD)
2407                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2408
2409                         if (bond_is_lb(bond))
2410                                 bond_alb_handle_link_change(bond, slave,
2411                                                             BOND_LINK_UP);
2412
2413                         if (!bond->curr_active_slave ||
2414                             (slave == bond->primary_slave))
2415                                 goto do_failover;
2416
2417                         continue;
2418
2419                 case BOND_LINK_DOWN:
2420                         if (slave->link_failure_count < UINT_MAX)
2421                                 slave->link_failure_count++;
2422
2423                         slave->link = BOND_LINK_DOWN;
2424
2425                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2426                             bond->params.mode == BOND_MODE_8023AD)
2427                                 bond_set_slave_inactive_flags(slave);
2428
2429                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2430                                 bond->dev->name, slave->dev->name);
2431
2432                         if (bond->params.mode == BOND_MODE_8023AD)
2433                                 bond_3ad_handle_link_change(slave,
2434                                                             BOND_LINK_DOWN);
2435
2436                         if (bond_is_lb(bond))
2437                                 bond_alb_handle_link_change(bond, slave,
2438                                                             BOND_LINK_DOWN);
2439
2440                         if (slave == bond->curr_active_slave)
2441                                 goto do_failover;
2442
2443                         continue;
2444
2445                 default:
2446                         pr_err("%s: invalid new link %d on slave %s\n",
2447                                bond->dev->name, slave->new_link,
2448                                slave->dev->name);
2449                         slave->new_link = BOND_LINK_NOCHANGE;
2450
2451                         continue;
2452                 }
2453
2454 do_failover:
2455                 ASSERT_RTNL();
2456                 write_lock_bh(&bond->curr_slave_lock);
2457                 bond_select_active_slave(bond);
2458                 write_unlock_bh(&bond->curr_slave_lock);
2459         }
2460
2461         bond_set_carrier(bond);
2462 }
2463
2464 /*
2465  * bond_mii_monitor
2466  *
2467  * Really a wrapper that splits the mii monitor into two phases: an
2468  * inspection, then (if inspection indicates something needs to be done)
2469  * an acquisition of appropriate locks followed by a commit phase to
2470  * implement whatever link state changes are indicated.
2471  */
2472 void bond_mii_monitor(struct work_struct *work)
2473 {
2474         struct bonding *bond = container_of(work, struct bonding,
2475                                             mii_work.work);
2476
2477         read_lock(&bond->lock);
2478         if (bond->kill_timers)
2479                 goto out;
2480
2481         if (bond->slave_cnt == 0)
2482                 goto re_arm;
2483
2484         if (bond->send_grat_arp) {
2485                 read_lock(&bond->curr_slave_lock);
2486                 bond_send_gratuitous_arp(bond);
2487                 read_unlock(&bond->curr_slave_lock);
2488         }
2489
2490         if (bond->send_unsol_na) {
2491                 read_lock(&bond->curr_slave_lock);
2492                 bond_send_unsolicited_na(bond);
2493                 read_unlock(&bond->curr_slave_lock);
2494         }
2495
2496         if (bond_miimon_inspect(bond)) {
2497                 read_unlock(&bond->lock);
2498                 rtnl_lock();
2499                 read_lock(&bond->lock);
2500
2501                 bond_miimon_commit(bond);
2502
2503                 read_unlock(&bond->lock);
2504                 rtnl_unlock();  /* might sleep, hold no other locks */
2505                 read_lock(&bond->lock);
2506         }
2507
2508 re_arm:
2509         if (bond->params.miimon)
2510                 queue_delayed_work(bond->wq, &bond->mii_work,
2511                                    msecs_to_jiffies(bond->params.miimon));
2512 out:
2513         read_unlock(&bond->lock);
2514 }
2515
2516 static __be32 bond_glean_dev_ip(struct net_device *dev)
2517 {
2518         struct in_device *idev;
2519         struct in_ifaddr *ifa;
2520         __be32 addr = 0;
2521
2522         if (!dev)
2523                 return 0;
2524
2525         rcu_read_lock();
2526         idev = __in_dev_get_rcu(dev);
2527         if (!idev)
2528                 goto out;
2529
2530         ifa = idev->ifa_list;
2531         if (!ifa)
2532                 goto out;
2533
2534         addr = ifa->ifa_local;
2535 out:
2536         rcu_read_unlock();
2537         return addr;
2538 }
2539
2540 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2541 {
2542         struct vlan_entry *vlan;
2543
2544         if (ip == bond->master_ip)
2545                 return 1;
2546
2547         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2548                 if (ip == vlan->vlan_ip)
2549                         return 1;
2550         }
2551
2552         return 0;
2553 }
2554
2555 /*
2556  * We go to the (large) trouble of VLAN tagging ARP frames because
2557  * switches in VLAN mode (especially if ports are configured as
2558  * "native" to a VLAN) might not pass non-tagged frames.
2559  */
2560 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2561 {
2562         struct sk_buff *skb;
2563
2564         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2565                  slave_dev->name, dest_ip, src_ip, vlan_id);
2566
2567         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2568                          NULL, slave_dev->dev_addr, NULL);
2569
2570         if (!skb) {
2571                 pr_err("ARP packet allocation failed\n");
2572                 return;
2573         }
2574         if (vlan_id) {
2575                 skb = vlan_put_tag(skb, vlan_id);
2576                 if (!skb) {
2577                         pr_err("failed to insert VLAN tag\n");
2578                         return;
2579                 }
2580         }
2581         arp_xmit(skb);
2582 }
2583
2584
2585 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2586 {
2587         int i, vlan_id, rv;
2588         __be32 *targets = bond->params.arp_targets;
2589         struct vlan_entry *vlan;
2590         struct net_device *vlan_dev;
2591         struct flowi fl;
2592         struct rtable *rt;
2593
2594         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2595                 if (!targets[i])
2596                         break;
2597                 pr_debug("basa: target %x\n", targets[i]);
2598                 if (!bond->vlgrp) {
2599                         pr_debug("basa: empty vlan: arp_send\n");
2600                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2601                                       bond->master_ip, 0);
2602                         continue;
2603                 }
2604
2605                 /*
2606                  * If VLANs are configured, we do a route lookup to
2607                  * determine which VLAN interface would be used, so we
2608                  * can tag the ARP with the proper VLAN tag.
2609                  */
2610                 memset(&fl, 0, sizeof(fl));
2611                 fl.fl4_dst = targets[i];
2612                 fl.fl4_tos = RTO_ONLINK;
2613
2614                 rv = ip_route_output_key(dev_net(bond->dev), &rt, &fl);
2615                 if (rv) {
2616                         if (net_ratelimit()) {
2617                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2618                                            bond->dev->name, &fl.fl4_dst);
2619                         }
2620                         continue;
2621                 }
2622
2623                 /*
2624                  * This target is not on a VLAN
2625                  */
2626                 if (rt->dst.dev == bond->dev) {
2627                         ip_rt_put(rt);
2628                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2629                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2630                                       bond->master_ip, 0);
2631                         continue;
2632                 }
2633
2634                 vlan_id = 0;
2635                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2636                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2637                         if (vlan_dev == rt->dst.dev) {
2638                                 vlan_id = vlan->vlan_id;
2639                                 pr_debug("basa: vlan match on %s %d\n",
2640                                        vlan_dev->name, vlan_id);
2641                                 break;
2642                         }
2643                 }
2644
2645                 if (vlan_id) {
2646                         ip_rt_put(rt);
2647                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2648                                       vlan->vlan_ip, vlan_id);
2649                         continue;
2650                 }
2651
2652                 if (net_ratelimit()) {
2653                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2654                                    bond->dev->name, &fl.fl4_dst,
2655                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2656                 }
2657                 ip_rt_put(rt);
2658         }
2659 }
2660
2661 /*
2662  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2663  * for each VLAN above us.
2664  *
2665  * Caller must hold curr_slave_lock for read or better
2666  */
2667 static void bond_send_gratuitous_arp(struct bonding *bond)
2668 {
2669         struct slave *slave = bond->curr_active_slave;
2670         struct vlan_entry *vlan;
2671         struct net_device *vlan_dev;
2672
2673         pr_debug("bond_send_grat_arp: bond %s slave %s\n",
2674                  bond->dev->name, slave ? slave->dev->name : "NULL");
2675
2676         if (!slave || !bond->send_grat_arp ||
2677             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2678                 return;
2679
2680         bond->send_grat_arp--;
2681
2682         if (bond->master_ip) {
2683                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2684                                 bond->master_ip, 0);
2685         }
2686
2687         if (!bond->vlgrp)
2688                 return;
2689
2690         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2691                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2692                 if (vlan->vlan_ip) {
2693                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2694                                       vlan->vlan_ip, vlan->vlan_id);
2695                 }
2696         }
2697 }
2698
2699 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2700 {
2701         int i;
2702         __be32 *targets = bond->params.arp_targets;
2703
2704         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2705                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2706                          &sip, &tip, i, &targets[i],
2707                          bond_has_this_ip(bond, tip));
2708                 if (sip == targets[i]) {
2709                         if (bond_has_this_ip(bond, tip))
2710                                 slave->last_arp_rx = jiffies;
2711                         return;
2712                 }
2713         }
2714 }
2715
2716 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2717 {
2718         struct arphdr *arp;
2719         struct slave *slave;
2720         struct bonding *bond;
2721         unsigned char *arp_ptr;
2722         __be32 sip, tip;
2723
2724         if (dev->priv_flags & IFF_802_1Q_VLAN) {
2725                 /*
2726                  * When using VLANS and bonding, dev and oriv_dev may be
2727                  * incorrect if the physical interface supports VLAN
2728                  * acceleration.  With this change ARP validation now
2729                  * works for hosts only reachable on the VLAN interface.
2730                  */
2731                 dev = vlan_dev_real_dev(dev);
2732                 orig_dev = dev_get_by_index_rcu(dev_net(skb->dev),skb->skb_iif);
2733         }
2734
2735         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2736                 goto out;
2737
2738         bond = netdev_priv(dev);
2739         read_lock(&bond->lock);
2740
2741         pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2742                  bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2743                  orig_dev ? orig_dev->name : "NULL");
2744
2745         slave = bond_get_slave_by_dev(bond, orig_dev);
2746         if (!slave || !slave_do_arp_validate(bond, slave))
2747                 goto out_unlock;
2748
2749         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2750                 goto out_unlock;
2751
2752         arp = arp_hdr(skb);
2753         if (arp->ar_hln != dev->addr_len ||
2754             skb->pkt_type == PACKET_OTHERHOST ||
2755             skb->pkt_type == PACKET_LOOPBACK ||
2756             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2757             arp->ar_pro != htons(ETH_P_IP) ||
2758             arp->ar_pln != 4)
2759                 goto out_unlock;
2760
2761         arp_ptr = (unsigned char *)(arp + 1);
2762         arp_ptr += dev->addr_len;
2763         memcpy(&sip, arp_ptr, 4);
2764         arp_ptr += 4 + dev->addr_len;
2765         memcpy(&tip, arp_ptr, 4);
2766
2767         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2768                  bond->dev->name, slave->dev->name, slave->state,
2769                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2770                  &sip, &tip);
2771
2772         /*
2773          * Backup slaves won't see the ARP reply, but do come through
2774          * here for each ARP probe (so we swap the sip/tip to validate
2775          * the probe).  In a "redundant switch, common router" type of
2776          * configuration, the ARP probe will (hopefully) travel from
2777          * the active, through one switch, the router, then the other
2778          * switch before reaching the backup.
2779          */
2780         if (slave->state == BOND_STATE_ACTIVE)
2781                 bond_validate_arp(bond, slave, sip, tip);
2782         else
2783                 bond_validate_arp(bond, slave, tip, sip);
2784
2785 out_unlock:
2786         read_unlock(&bond->lock);
2787 out:
2788         dev_kfree_skb(skb);
2789         return NET_RX_SUCCESS;
2790 }
2791
2792 /*
2793  * this function is called regularly to monitor each slave's link
2794  * ensuring that traffic is being sent and received when arp monitoring
2795  * is used in load-balancing mode. if the adapter has been dormant, then an
2796  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2797  * arp monitoring in active backup mode.
2798  */
2799 void bond_loadbalance_arp_mon(struct work_struct *work)
2800 {
2801         struct bonding *bond = container_of(work, struct bonding,
2802                                             arp_work.work);
2803         struct slave *slave, *oldcurrent;
2804         int do_failover = 0;
2805         int delta_in_ticks;
2806         int i;
2807
2808         read_lock(&bond->lock);
2809
2810         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2811
2812         if (bond->kill_timers)
2813                 goto out;
2814
2815         if (bond->slave_cnt == 0)
2816                 goto re_arm;
2817
2818         read_lock(&bond->curr_slave_lock);
2819         oldcurrent = bond->curr_active_slave;
2820         read_unlock(&bond->curr_slave_lock);
2821
2822         /* see if any of the previous devices are up now (i.e. they have
2823          * xmt and rcv traffic). the curr_active_slave does not come into
2824          * the picture unless it is null. also, slave->jiffies is not needed
2825          * here because we send an arp on each slave and give a slave as
2826          * long as it needs to get the tx/rx within the delta.
2827          * TODO: what about up/down delay in arp mode? it wasn't here before
2828          *       so it can wait
2829          */
2830         bond_for_each_slave(bond, slave, i) {
2831                 unsigned long trans_start = dev_trans_start(slave->dev);
2832
2833                 if (slave->link != BOND_LINK_UP) {
2834                         if (time_in_range(jiffies,
2835                                 trans_start - delta_in_ticks,
2836                                 trans_start + delta_in_ticks) &&
2837                             time_in_range(jiffies,
2838                                 slave->dev->last_rx - delta_in_ticks,
2839                                 slave->dev->last_rx + delta_in_ticks)) {
2840
2841                                 slave->link  = BOND_LINK_UP;
2842                                 slave->state = BOND_STATE_ACTIVE;
2843
2844                                 /* primary_slave has no meaning in round-robin
2845                                  * mode. the window of a slave being up and
2846                                  * curr_active_slave being null after enslaving
2847                                  * is closed.
2848                                  */
2849                                 if (!oldcurrent) {
2850                                         pr_info("%s: link status definitely up for interface %s, ",
2851                                                 bond->dev->name,
2852                                                 slave->dev->name);
2853                                         do_failover = 1;
2854                                 } else {
2855                                         pr_info("%s: interface %s is now up\n",
2856                                                 bond->dev->name,
2857                                                 slave->dev->name);
2858                                 }
2859                         }
2860                 } else {
2861                         /* slave->link == BOND_LINK_UP */
2862
2863                         /* not all switches will respond to an arp request
2864                          * when the source ip is 0, so don't take the link down
2865                          * if we don't know our ip yet
2866                          */
2867                         if (!time_in_range(jiffies,
2868                                 trans_start - delta_in_ticks,
2869                                 trans_start + 2 * delta_in_ticks) ||
2870                             !time_in_range(jiffies,
2871                                 slave->dev->last_rx - delta_in_ticks,
2872                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2873
2874                                 slave->link  = BOND_LINK_DOWN;
2875                                 slave->state = BOND_STATE_BACKUP;
2876
2877                                 if (slave->link_failure_count < UINT_MAX)
2878                                         slave->link_failure_count++;
2879
2880                                 pr_info("%s: interface %s is now down.\n",
2881                                         bond->dev->name,
2882                                         slave->dev->name);
2883
2884                                 if (slave == oldcurrent)
2885                                         do_failover = 1;
2886                         }
2887                 }
2888
2889                 /* note: if switch is in round-robin mode, all links
2890                  * must tx arp to ensure all links rx an arp - otherwise
2891                  * links may oscillate or not come up at all; if switch is
2892                  * in something like xor mode, there is nothing we can
2893                  * do - all replies will be rx'ed on same link causing slaves
2894                  * to be unstable during low/no traffic periods
2895                  */
2896                 if (IS_UP(slave->dev))
2897                         bond_arp_send_all(bond, slave);
2898         }
2899
2900         if (do_failover) {
2901                 write_lock_bh(&bond->curr_slave_lock);
2902
2903                 bond_select_active_slave(bond);
2904
2905                 write_unlock_bh(&bond->curr_slave_lock);
2906         }
2907
2908 re_arm:
2909         if (bond->params.arp_interval)
2910                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2911 out:
2912         read_unlock(&bond->lock);
2913 }
2914
2915 /*
2916  * Called to inspect slaves for active-backup mode ARP monitor link state
2917  * changes.  Sets new_link in slaves to specify what action should take
2918  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2919  * to link states must be committed.
2920  *
2921  * Called with bond->lock held for read.
2922  */
2923 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2924 {
2925         struct slave *slave;
2926         int i, commit = 0;
2927         unsigned long trans_start;
2928
2929         bond_for_each_slave(bond, slave, i) {
2930                 slave->new_link = BOND_LINK_NOCHANGE;
2931
2932                 if (slave->link != BOND_LINK_UP) {
2933                         if (time_in_range(jiffies,
2934                                 slave_last_rx(bond, slave) - delta_in_ticks,
2935                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2936
2937                                 slave->new_link = BOND_LINK_UP;
2938                                 commit++;
2939                         }
2940
2941                         continue;
2942                 }
2943
2944                 /*
2945                  * Give slaves 2*delta after being enslaved or made
2946                  * active.  This avoids bouncing, as the last receive
2947                  * times need a full ARP monitor cycle to be updated.
2948                  */
2949                 if (time_in_range(jiffies,
2950                                   slave->jiffies - delta_in_ticks,
2951                                   slave->jiffies + 2 * delta_in_ticks))
2952                         continue;
2953
2954                 /*
2955                  * Backup slave is down if:
2956                  * - No current_arp_slave AND
2957                  * - more than 3*delta since last receive AND
2958                  * - the bond has an IP address
2959                  *
2960                  * Note: a non-null current_arp_slave indicates
2961                  * the curr_active_slave went down and we are
2962                  * searching for a new one; under this condition
2963                  * we only take the curr_active_slave down - this
2964                  * gives each slave a chance to tx/rx traffic
2965                  * before being taken out
2966                  */
2967                 if (slave->state == BOND_STATE_BACKUP &&
2968                     !bond->current_arp_slave &&
2969                     !time_in_range(jiffies,
2970                         slave_last_rx(bond, slave) - delta_in_ticks,
2971                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2972
2973                         slave->new_link = BOND_LINK_DOWN;
2974                         commit++;
2975                 }
2976
2977                 /*
2978                  * Active slave is down if:
2979                  * - more than 2*delta since transmitting OR
2980                  * - (more than 2*delta since receive AND
2981                  *    the bond has an IP address)
2982                  */
2983                 trans_start = dev_trans_start(slave->dev);
2984                 if ((slave->state == BOND_STATE_ACTIVE) &&
2985                     (!time_in_range(jiffies,
2986                         trans_start - delta_in_ticks,
2987                         trans_start + 2 * delta_in_ticks) ||
2988                      !time_in_range(jiffies,
2989                         slave_last_rx(bond, slave) - delta_in_ticks,
2990                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2991
2992                         slave->new_link = BOND_LINK_DOWN;
2993                         commit++;
2994                 }
2995         }
2996
2997         return commit;
2998 }
2999
3000 /*
3001  * Called to commit link state changes noted by inspection step of
3002  * active-backup mode ARP monitor.
3003  *
3004  * Called with RTNL and bond->lock for read.
3005  */
3006 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3007 {
3008         struct slave *slave;
3009         int i;
3010         unsigned long trans_start;
3011
3012         bond_for_each_slave(bond, slave, i) {
3013                 switch (slave->new_link) {
3014                 case BOND_LINK_NOCHANGE:
3015                         continue;
3016
3017                 case BOND_LINK_UP:
3018                         trans_start = dev_trans_start(slave->dev);
3019                         if ((!bond->curr_active_slave &&
3020                              time_in_range(jiffies,
3021                                            trans_start - delta_in_ticks,
3022                                            trans_start + delta_in_ticks)) ||
3023                             bond->curr_active_slave != slave) {
3024                                 slave->link = BOND_LINK_UP;
3025                                 bond->current_arp_slave = NULL;
3026
3027                                 pr_info("%s: link status definitely up for interface %s.\n",
3028                                         bond->dev->name, slave->dev->name);
3029
3030                                 if (!bond->curr_active_slave ||
3031                                     (slave == bond->primary_slave))
3032                                         goto do_failover;
3033
3034                         }
3035
3036                         continue;
3037
3038                 case BOND_LINK_DOWN:
3039                         if (slave->link_failure_count < UINT_MAX)
3040                                 slave->link_failure_count++;
3041
3042                         slave->link = BOND_LINK_DOWN;
3043                         bond_set_slave_inactive_flags(slave);
3044
3045                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3046                                 bond->dev->name, slave->dev->name);
3047
3048                         if (slave == bond->curr_active_slave) {
3049                                 bond->current_arp_slave = NULL;
3050                                 goto do_failover;
3051                         }
3052
3053                         continue;
3054
3055                 default:
3056                         pr_err("%s: impossible: new_link %d on slave %s\n",
3057                                bond->dev->name, slave->new_link,
3058                                slave->dev->name);
3059                         continue;
3060                 }
3061
3062 do_failover:
3063                 ASSERT_RTNL();
3064                 write_lock_bh(&bond->curr_slave_lock);
3065                 bond_select_active_slave(bond);
3066                 write_unlock_bh(&bond->curr_slave_lock);
3067         }
3068
3069         bond_set_carrier(bond);
3070 }
3071
3072 /*
3073  * Send ARP probes for active-backup mode ARP monitor.
3074  *
3075  * Called with bond->lock held for read.
3076  */
3077 static void bond_ab_arp_probe(struct bonding *bond)
3078 {
3079         struct slave *slave;
3080         int i;
3081
3082         read_lock(&bond->curr_slave_lock);
3083
3084         if (bond->current_arp_slave && bond->curr_active_slave)
3085                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3086                         bond->current_arp_slave->dev->name,
3087                         bond->curr_active_slave->dev->name);
3088
3089         if (bond->curr_active_slave) {
3090                 bond_arp_send_all(bond, bond->curr_active_slave);
3091                 read_unlock(&bond->curr_slave_lock);
3092                 return;
3093         }
3094
3095         read_unlock(&bond->curr_slave_lock);
3096
3097         /* if we don't have a curr_active_slave, search for the next available
3098          * backup slave from the current_arp_slave and make it the candidate
3099          * for becoming the curr_active_slave
3100          */
3101
3102         if (!bond->current_arp_slave) {
3103                 bond->current_arp_slave = bond->first_slave;
3104                 if (!bond->current_arp_slave)
3105                         return;
3106         }
3107
3108         bond_set_slave_inactive_flags(bond->current_arp_slave);
3109
3110         /* search for next candidate */
3111         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3112                 if (IS_UP(slave->dev)) {
3113                         slave->link = BOND_LINK_BACK;
3114                         bond_set_slave_active_flags(slave);
3115                         bond_arp_send_all(bond, slave);
3116                         slave->jiffies = jiffies;
3117                         bond->current_arp_slave = slave;
3118                         break;
3119                 }
3120
3121                 /* if the link state is up at this point, we
3122                  * mark it down - this can happen if we have
3123                  * simultaneous link failures and
3124                  * reselect_active_interface doesn't make this
3125                  * one the current slave so it is still marked
3126                  * up when it is actually down
3127                  */
3128                 if (slave->link == BOND_LINK_UP) {
3129                         slave->link = BOND_LINK_DOWN;
3130                         if (slave->link_failure_count < UINT_MAX)
3131                                 slave->link_failure_count++;
3132
3133                         bond_set_slave_inactive_flags(slave);
3134
3135                         pr_info("%s: backup interface %s is now down.\n",
3136                                 bond->dev->name, slave->dev->name);
3137                 }
3138         }
3139 }
3140
3141 void bond_activebackup_arp_mon(struct work_struct *work)
3142 {
3143         struct bonding *bond = container_of(work, struct bonding,
3144                                             arp_work.work);
3145         int delta_in_ticks;
3146
3147         read_lock(&bond->lock);
3148
3149         if (bond->kill_timers)
3150                 goto out;
3151
3152         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3153
3154         if (bond->slave_cnt == 0)
3155                 goto re_arm;
3156
3157         if (bond->send_grat_arp) {
3158                 read_lock(&bond->curr_slave_lock);
3159                 bond_send_gratuitous_arp(bond);
3160                 read_unlock(&bond->curr_slave_lock);
3161         }
3162
3163         if (bond->send_unsol_na) {
3164                 read_lock(&bond->curr_slave_lock);
3165                 bond_send_unsolicited_na(bond);
3166                 read_unlock(&bond->curr_slave_lock);
3167         }
3168
3169         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3170                 read_unlock(&bond->lock);
3171                 rtnl_lock();
3172                 read_lock(&bond->lock);
3173
3174                 bond_ab_arp_commit(bond, delta_in_ticks);
3175
3176                 read_unlock(&bond->lock);
3177                 rtnl_unlock();
3178                 read_lock(&bond->lock);
3179         }
3180
3181         bond_ab_arp_probe(bond);
3182
3183 re_arm:
3184         if (bond->params.arp_interval)
3185                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3186 out:
3187         read_unlock(&bond->lock);
3188 }
3189
3190 /*------------------------------ proc/seq_file-------------------------------*/
3191
3192 #ifdef CONFIG_PROC_FS
3193
3194 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3195         __acquires(&dev_base_lock)
3196         __acquires(&bond->lock)
3197 {
3198         struct bonding *bond = seq->private;
3199         loff_t off = 0;
3200         struct slave *slave;
3201         int i;
3202
3203         /* make sure the bond won't be taken away */
3204         read_lock(&dev_base_lock);
3205         read_lock(&bond->lock);
3206
3207         if (*pos == 0)
3208                 return SEQ_START_TOKEN;
3209
3210         bond_for_each_slave(bond, slave, i) {
3211                 if (++off == *pos)
3212                         return slave;
3213         }
3214
3215         return NULL;
3216 }
3217
3218 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3219 {
3220         struct bonding *bond = seq->private;
3221         struct slave *slave = v;
3222
3223         ++*pos;
3224         if (v == SEQ_START_TOKEN)
3225                 return bond->first_slave;
3226
3227         slave = slave->next;
3228
3229         return (slave == bond->first_slave) ? NULL : slave;
3230 }
3231
3232 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3233         __releases(&bond->lock)
3234         __releases(&dev_base_lock)
3235 {
3236         struct bonding *bond = seq->private;
3237
3238         read_unlock(&bond->lock);
3239         read_unlock(&dev_base_lock);
3240 }
3241
3242 static void bond_info_show_master(struct seq_file *seq)
3243 {
3244         struct bonding *bond = seq->private;
3245         struct slave *curr;
3246         int i;
3247
3248         read_lock(&bond->curr_slave_lock);
3249         curr = bond->curr_active_slave;
3250         read_unlock(&bond->curr_slave_lock);
3251
3252         seq_printf(seq, "Bonding Mode: %s",
3253                    bond_mode_name(bond->params.mode));
3254
3255         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3256             bond->params.fail_over_mac)
3257                 seq_printf(seq, " (fail_over_mac %s)",
3258                    fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3259
3260         seq_printf(seq, "\n");
3261
3262         if (bond->params.mode == BOND_MODE_XOR ||
3263                 bond->params.mode == BOND_MODE_8023AD) {
3264                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3265                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3266                         bond->params.xmit_policy);
3267         }
3268
3269         if (USES_PRIMARY(bond->params.mode)) {
3270                 seq_printf(seq, "Primary Slave: %s",
3271                            (bond->primary_slave) ?
3272                            bond->primary_slave->dev->name : "None");
3273                 if (bond->primary_slave)
3274                         seq_printf(seq, " (primary_reselect %s)",
3275                    pri_reselect_tbl[bond->params.primary_reselect].modename);
3276
3277                 seq_printf(seq, "\nCurrently Active Slave: %s\n",
3278                            (curr) ? curr->dev->name : "None");
3279         }
3280
3281         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3282                    "up" : "down");
3283         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3284         seq_printf(seq, "Up Delay (ms): %d\n",
3285                    bond->params.updelay * bond->params.miimon);
3286         seq_printf(seq, "Down Delay (ms): %d\n",
3287                    bond->params.downdelay * bond->params.miimon);
3288
3289
3290         /* ARP information */
3291         if (bond->params.arp_interval > 0) {
3292                 int printed = 0;
3293                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3294                                 bond->params.arp_interval);
3295
3296                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3297
3298                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
3299                         if (!bond->params.arp_targets[i])
3300                                 break;
3301                         if (printed)
3302                                 seq_printf(seq, ",");
3303                         seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3304                         printed = 1;
3305                 }
3306                 seq_printf(seq, "\n");
3307         }
3308
3309         if (bond->params.mode == BOND_MODE_8023AD) {
3310                 struct ad_info ad_info;
3311
3312                 seq_puts(seq, "\n802.3ad info\n");
3313                 seq_printf(seq, "LACP rate: %s\n",
3314                            (bond->params.lacp_fast) ? "fast" : "slow");
3315                 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3316                            ad_select_tbl[bond->params.ad_select].modename);
3317
3318                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3319                         seq_printf(seq, "bond %s has no active aggregator\n",
3320                                    bond->dev->name);
3321                 } else {
3322                         seq_printf(seq, "Active Aggregator Info:\n");
3323
3324                         seq_printf(seq, "\tAggregator ID: %d\n",
3325                                    ad_info.aggregator_id);
3326                         seq_printf(seq, "\tNumber of ports: %d\n",
3327                                    ad_info.ports);
3328                         seq_printf(seq, "\tActor Key: %d\n",
3329                                    ad_info.actor_key);
3330                         seq_printf(seq, "\tPartner Key: %d\n",
3331                                    ad_info.partner_key);
3332                         seq_printf(seq, "\tPartner Mac Address: %pM\n",
3333                                    ad_info.partner_system);
3334                 }
3335         }
3336 }
3337
3338 static void bond_info_show_slave(struct seq_file *seq,
3339                                  const struct slave *slave)
3340 {
3341         struct bonding *bond = seq->private;
3342
3343         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3344         seq_printf(seq, "MII Status: %s\n",
3345                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3346         seq_printf(seq, "Link Failure Count: %u\n",
3347                    slave->link_failure_count);
3348
3349         seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3350
3351         if (bond->params.mode == BOND_MODE_8023AD) {
3352                 const struct aggregator *agg
3353                         = SLAVE_AD_INFO(slave).port.aggregator;
3354
3355                 if (agg)
3356                         seq_printf(seq, "Aggregator ID: %d\n",
3357                                    agg->aggregator_identifier);
3358                 else
3359                         seq_puts(seq, "Aggregator ID: N/A\n");
3360         }
3361         seq_printf(seq, "Slave queue ID: %d\n", slave->queue_id);
3362 }
3363
3364 static int bond_info_seq_show(struct seq_file *seq, void *v)
3365 {
3366         if (v == SEQ_START_TOKEN) {
3367                 seq_printf(seq, "%s\n", version);
3368                 bond_info_show_master(seq);
3369         } else
3370                 bond_info_show_slave(seq, v);
3371
3372         return 0;
3373 }
3374
3375 static const struct seq_operations bond_info_seq_ops = {
3376         .start = bond_info_seq_start,
3377         .next  = bond_info_seq_next,
3378         .stop  = bond_info_seq_stop,
3379         .show  = bond_info_seq_show,
3380 };
3381
3382 static int bond_info_open(struct inode *inode, struct file *file)
3383 {
3384         struct seq_file *seq;
3385         struct proc_dir_entry *proc;
3386         int res;
3387
3388         res = seq_open(file, &bond_info_seq_ops);
3389         if (!res) {
3390                 /* recover the pointer buried in proc_dir_entry data */
3391                 seq = file->private_data;
3392                 proc = PDE(inode);
3393                 seq->private = proc->data;
3394         }
3395
3396         return res;
3397 }
3398
3399 static const struct file_operations bond_info_fops = {
3400         .owner   = THIS_MODULE,
3401         .open    = bond_info_open,
3402         .read    = seq_read,
3403         .llseek  = seq_lseek,
3404         .release = seq_release,
3405 };
3406
3407 static void bond_create_proc_entry(struct bonding *bond)
3408 {
3409         struct net_device *bond_dev = bond->dev;
3410         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3411
3412         if (bn->proc_dir) {
3413                 bond->proc_entry = proc_create_data(bond_dev->name,
3414                                                     S_IRUGO, bn->proc_dir,
3415                                                     &bond_info_fops, bond);
3416                 if (bond->proc_entry == NULL)
3417                         pr_warning("Warning: Cannot create /proc/net/%s/%s\n",
3418                                    DRV_NAME, bond_dev->name);
3419                 else
3420                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3421         }
3422 }
3423
3424 static void bond_remove_proc_entry(struct bonding *bond)
3425 {
3426         struct net_device *bond_dev = bond->dev;
3427         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3428
3429         if (bn->proc_dir && bond->proc_entry) {
3430                 remove_proc_entry(bond->proc_file_name, bn->proc_dir);
3431                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3432                 bond->proc_entry = NULL;
3433         }
3434 }
3435
3436 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3437  * Caller must hold rtnl_lock.
3438  */
3439 static void __net_init bond_create_proc_dir(struct bond_net *bn)
3440 {
3441         if (!bn->proc_dir) {
3442                 bn->proc_dir = proc_mkdir(DRV_NAME, bn->net->proc_net);
3443                 if (!bn->proc_dir)
3444                         pr_warning("Warning: cannot create /proc/net/%s\n",
3445                                    DRV_NAME);
3446         }
3447 }
3448
3449 /* Destroy the bonding directory under /proc/net, if empty.
3450  * Caller must hold rtnl_lock.
3451  */
3452 static void __net_exit bond_destroy_proc_dir(struct bond_net *bn)
3453 {
3454         if (bn->proc_dir) {
3455                 remove_proc_entry(DRV_NAME, bn->net->proc_net);
3456                 bn->proc_dir = NULL;
3457         }
3458 }
3459
3460 #else /* !CONFIG_PROC_FS */
3461
3462 static void bond_create_proc_entry(struct bonding *bond)
3463 {
3464 }
3465
3466 static void bond_remove_proc_entry(struct bonding *bond)
3467 {
3468 }
3469
3470 static inline void bond_create_proc_dir(struct bond_net *bn)
3471 {
3472 }
3473
3474 static inline void bond_destroy_proc_dir(struct bond_net *bn)
3475 {
3476 }
3477
3478 #endif /* CONFIG_PROC_FS */
3479
3480
3481 /*-------------------------- netdev event handling --------------------------*/
3482
3483 /*
3484  * Change device name
3485  */
3486 static int bond_event_changename(struct bonding *bond)
3487 {
3488         bond_remove_proc_entry(bond);
3489         bond_create_proc_entry(bond);
3490
3491         return NOTIFY_DONE;
3492 }
3493
3494 static int bond_master_netdev_event(unsigned long event,
3495                                     struct net_device *bond_dev)
3496 {
3497         struct bonding *event_bond = netdev_priv(bond_dev);
3498
3499         switch (event) {
3500         case NETDEV_CHANGENAME:
3501                 return bond_event_changename(event_bond);
3502         default:
3503                 break;
3504         }
3505
3506         return NOTIFY_DONE;
3507 }
3508
3509 static int bond_slave_netdev_event(unsigned long event,
3510                                    struct net_device *slave_dev)
3511 {
3512         struct net_device *bond_dev = slave_dev->master;
3513         struct bonding *bond = netdev_priv(bond_dev);
3514
3515         switch (event) {
3516         case NETDEV_UNREGISTER:
3517                 if (bond_dev) {
3518                         if (bond->setup_by_slave)
3519                                 bond_release_and_destroy(bond_dev, slave_dev);
3520                         else
3521                                 bond_release(bond_dev, slave_dev);
3522                 }
3523                 break;
3524         case NETDEV_CHANGE:
3525                 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3526                         struct slave *slave;
3527
3528                         slave = bond_get_slave_by_dev(bond, slave_dev);
3529                         if (slave) {
3530                                 u16 old_speed = slave->speed;
3531                                 u16 old_duplex = slave->duplex;
3532
3533                                 bond_update_speed_duplex(slave);
3534
3535                                 if (bond_is_lb(bond))
3536                                         break;
3537
3538                                 if (old_speed != slave->speed)
3539                                         bond_3ad_adapter_speed_changed(slave);
3540                                 if (old_duplex != slave->duplex)
3541                                         bond_3ad_adapter_duplex_changed(slave);
3542                         }
3543                 }
3544
3545                 break;
3546         case NETDEV_DOWN:
3547                 /*
3548                  * ... Or is it this?
3549                  */
3550                 break;
3551         case NETDEV_CHANGEMTU:
3552                 /*
3553                  * TODO: Should slaves be allowed to
3554                  * independently alter their MTU?  For
3555                  * an active-backup bond, slaves need
3556                  * not be the same type of device, so
3557                  * MTUs may vary.  For other modes,
3558                  * slaves arguably should have the
3559                  * same MTUs. To do this, we'd need to
3560                  * take over the slave's change_mtu
3561                  * function for the duration of their
3562                  * servitude.
3563                  */
3564                 break;
3565         case NETDEV_CHANGENAME:
3566                 /*
3567                  * TODO: handle changing the primary's name
3568                  */
3569                 break;
3570         case NETDEV_FEAT_CHANGE:
3571                 bond_compute_features(bond);
3572                 break;
3573         default:
3574                 break;
3575         }
3576
3577         return NOTIFY_DONE;
3578 }
3579
3580 /*
3581  * bond_netdev_event: handle netdev notifier chain events.
3582  *
3583  * This function receives events for the netdev chain.  The caller (an
3584  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3585  * locks for us to safely manipulate the slave devices (RTNL lock,
3586  * dev_probe_lock).
3587  */
3588 static int bond_netdev_event(struct notifier_block *this,
3589                              unsigned long event, void *ptr)
3590 {
3591         struct net_device *event_dev = (struct net_device *)ptr;
3592
3593         pr_debug("event_dev: %s, event: %lx\n",
3594                  event_dev ? event_dev->name : "None",
3595                  event);
3596
3597         if (!(event_dev->priv_flags & IFF_BONDING))
3598                 return NOTIFY_DONE;
3599
3600         if (event_dev->flags & IFF_MASTER) {
3601                 pr_debug("IFF_MASTER\n");
3602                 return bond_master_netdev_event(event, event_dev);
3603         }
3604
3605         if (event_dev->flags & IFF_SLAVE) {
3606                 pr_debug("IFF_SLAVE\n");
3607                 return bond_slave_netdev_event(event, event_dev);
3608         }
3609
3610         return NOTIFY_DONE;
3611 }
3612
3613 /*
3614  * bond_inetaddr_event: handle inetaddr notifier chain events.
3615  *
3616  * We keep track of device IPs primarily to use as source addresses in
3617  * ARP monitor probes (rather than spewing out broadcasts all the time).
3618  *
3619  * We track one IP for the main device (if it has one), plus one per VLAN.
3620  */
3621 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3622 {
3623         struct in_ifaddr *ifa = ptr;
3624         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3625         struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3626         struct bonding *bond;
3627         struct vlan_entry *vlan;
3628
3629         list_for_each_entry(bond, &bn->dev_list, bond_list) {
3630                 if (bond->dev == event_dev) {
3631                         switch (event) {
3632                         case NETDEV_UP:
3633                                 bond->master_ip = ifa->ifa_local;
3634                                 return NOTIFY_OK;
3635                         case NETDEV_DOWN:
3636                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3637                                 return NOTIFY_OK;
3638                         default:
3639                                 return NOTIFY_DONE;
3640                         }
3641                 }
3642
3643                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3644                         if (!bond->vlgrp)
3645                                 continue;
3646                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3647                         if (vlan_dev == event_dev) {
3648                                 switch (event) {
3649                                 case NETDEV_UP:
3650                                         vlan->vlan_ip = ifa->ifa_local;
3651                                         return NOTIFY_OK;
3652                                 case NETDEV_DOWN:
3653                                         vlan->vlan_ip =
3654                                                 bond_glean_dev_ip(vlan_dev);
3655                                         return NOTIFY_OK;
3656                                 default:
3657                                         return NOTIFY_DONE;
3658                                 }
3659                         }
3660                 }
3661         }
3662         return NOTIFY_DONE;
3663 }
3664
3665 static struct notifier_block bond_netdev_notifier = {
3666         .notifier_call = bond_netdev_event,
3667 };
3668
3669 static struct notifier_block bond_inetaddr_notifier = {
3670         .notifier_call = bond_inetaddr_event,
3671 };
3672
3673 /*-------------------------- Packet type handling ---------------------------*/
3674
3675 /* register to receive lacpdus on a bond */
3676 static void bond_register_lacpdu(struct bonding *bond)
3677 {
3678         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3679
3680         /* initialize packet type */
3681         pk_type->type = PKT_TYPE_LACPDU;
3682         pk_type->dev = bond->dev;
3683         pk_type->func = bond_3ad_lacpdu_recv;
3684
3685         dev_add_pack(pk_type);
3686 }
3687
3688 /* unregister to receive lacpdus on a bond */
3689 static void bond_unregister_lacpdu(struct bonding *bond)
3690 {
3691         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3692 }
3693
3694 void bond_register_arp(struct bonding *bond)
3695 {
3696         struct packet_type *pt = &bond->arp_mon_pt;
3697
3698         if (pt->type)
3699                 return;
3700
3701         pt->type = htons(ETH_P_ARP);
3702         pt->dev = bond->dev;
3703         pt->func = bond_arp_rcv;
3704         dev_add_pack(pt);
3705 }
3706
3707 void bond_unregister_arp(struct bonding *bond)
3708 {
3709         struct packet_type *pt = &bond->arp_mon_pt;
3710
3711         dev_remove_pack(pt);
3712         pt->type = 0;
3713 }
3714
3715 /*---------------------------- Hashing Policies -----------------------------*/
3716
3717 /*
3718  * Hash for the output device based upon layer 2 and layer 3 data. If
3719  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3720  */
3721 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3722 {
3723         struct ethhdr *data = (struct ethhdr *)skb->data;
3724         struct iphdr *iph = ip_hdr(skb);
3725
3726         if (skb->protocol == htons(ETH_P_IP)) {
3727                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3728                         (data->h_dest[5] ^ data->h_source[5])) % count;
3729         }
3730
3731         return (data->h_dest[5] ^ data->h_source[5]) % count;
3732 }
3733
3734 /*
3735  * Hash for the output device based upon layer 3 and layer 4 data. If
3736  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3737  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3738  */
3739 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3740 {
3741         struct ethhdr *data = (struct ethhdr *)skb->data;
3742         struct iphdr *iph = ip_hdr(skb);
3743         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3744         int layer4_xor = 0;
3745
3746         if (skb->protocol == htons(ETH_P_IP)) {
3747                 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3748                     (iph->protocol == IPPROTO_TCP ||
3749                      iph->protocol == IPPROTO_UDP)) {
3750                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3751                 }
3752                 return (layer4_xor ^
3753                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3754
3755         }
3756
3757         return (data->h_dest[5] ^ data->h_source[5]) % count;
3758 }
3759
3760 /*
3761  * Hash for the output device based upon layer 2 data
3762  */
3763 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3764 {
3765         struct ethhdr *data = (struct ethhdr *)skb->data;
3766
3767         return (data->h_dest[5] ^ data->h_source[5]) % count;
3768 }
3769
3770 /*-------------------------- Device entry points ----------------------------*/
3771
3772 static int bond_open(struct net_device *bond_dev)
3773 {
3774         struct bonding *bond = netdev_priv(bond_dev);
3775
3776         bond->kill_timers = 0;
3777
3778         INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3779
3780         if (bond_is_lb(bond)) {
3781                 /* bond_alb_initialize must be called before the timer
3782                  * is started.
3783                  */
3784                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3785                         /* something went wrong - fail the open operation */
3786                         return -ENOMEM;
3787                 }
3788
3789                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3790                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3791         }
3792
3793         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3794                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3795                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3796         }
3797
3798         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3799                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3800                         INIT_DELAYED_WORK(&bond->arp_work,
3801                                           bond_activebackup_arp_mon);
3802                 else
3803                         INIT_DELAYED_WORK(&bond->arp_work,
3804                                           bond_loadbalance_arp_mon);
3805
3806                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3807                 if (bond->params.arp_validate)
3808                         bond_register_arp(bond);
3809         }
3810
3811         if (bond->params.mode == BOND_MODE_8023AD) {
3812                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3813                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3814                 /* register to receive LACPDUs */
3815                 bond_register_lacpdu(bond);
3816                 bond_3ad_initiate_agg_selection(bond, 1);
3817         }
3818
3819         return 0;
3820 }
3821
3822 static int bond_close(struct net_device *bond_dev)
3823 {
3824         struct bonding *bond = netdev_priv(bond_dev);
3825
3826         if (bond->params.mode == BOND_MODE_8023AD) {
3827                 /* Unregister the receive of LACPDUs */
3828                 bond_unregister_lacpdu(bond);
3829         }
3830
3831         if (bond->params.arp_validate)
3832                 bond_unregister_arp(bond);
3833
3834         write_lock_bh(&bond->lock);
3835
3836         bond->send_grat_arp = 0;
3837         bond->send_unsol_na = 0;
3838
3839         /* signal timers not to re-arm */
3840         bond->kill_timers = 1;
3841
3842         write_unlock_bh(&bond->lock);
3843
3844         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3845                 cancel_delayed_work(&bond->mii_work);
3846         }
3847
3848         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3849                 cancel_delayed_work(&bond->arp_work);
3850         }
3851
3852         switch (bond->params.mode) {
3853         case BOND_MODE_8023AD:
3854                 cancel_delayed_work(&bond->ad_work);
3855                 break;
3856         case BOND_MODE_TLB:
3857         case BOND_MODE_ALB:
3858                 cancel_delayed_work(&bond->alb_work);
3859                 break;
3860         default:
3861                 break;
3862         }
3863
3864         if (delayed_work_pending(&bond->mcast_work))
3865                 cancel_delayed_work(&bond->mcast_work);
3866
3867         if (bond_is_lb(bond)) {
3868                 /* Must be called only after all
3869                  * slaves have been released
3870                  */
3871                 bond_alb_deinitialize(bond);
3872         }
3873
3874         return 0;
3875 }
3876
3877 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3878                                                 struct rtnl_link_stats64 *stats)
3879 {
3880         struct bonding *bond = netdev_priv(bond_dev);
3881         struct rtnl_link_stats64 temp;
3882         struct slave *slave;
3883         int i;
3884
3885         memset(stats, 0, sizeof(*stats));
3886
3887         read_lock_bh(&bond->lock);
3888
3889         bond_for_each_slave(bond, slave, i) {
3890                 const struct rtnl_link_stats64 *sstats =
3891                         dev_get_stats(slave->dev, &temp);
3892
3893                 stats->rx_packets += sstats->rx_packets;
3894                 stats->rx_bytes += sstats->rx_bytes;
3895                 stats->rx_errors += sstats->rx_errors;
3896                 stats->rx_dropped += sstats->rx_dropped;
3897
3898                 stats->tx_packets += sstats->tx_packets;
3899                 stats->tx_bytes += sstats->tx_bytes;
3900                 stats->tx_errors += sstats->tx_errors;
3901                 stats->tx_dropped += sstats->tx_dropped;
3902
3903                 stats->multicast += sstats->multicast;
3904                 stats->collisions += sstats->collisions;
3905
3906                 stats->rx_length_errors += sstats->rx_length_errors;
3907                 stats->rx_over_errors += sstats->rx_over_errors;
3908                 stats->rx_crc_errors += sstats->rx_crc_errors;
3909                 stats->rx_frame_errors += sstats->rx_frame_errors;
3910                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3911                 stats->rx_missed_errors += sstats->rx_missed_errors;
3912
3913                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3914                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3915                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3916                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3917                 stats->tx_window_errors += sstats->tx_window_errors;
3918         }
3919
3920         read_unlock_bh(&bond->lock);
3921
3922         return stats;
3923 }
3924
3925 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3926 {
3927         struct net_device *slave_dev = NULL;
3928         struct ifbond k_binfo;
3929         struct ifbond __user *u_binfo = NULL;
3930         struct ifslave k_sinfo;
3931         struct ifslave __user *u_sinfo = NULL;
3932         struct mii_ioctl_data *mii = NULL;
3933         int res = 0;
3934
3935         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3936
3937         switch (cmd) {
3938         case SIOCGMIIPHY:
3939                 mii = if_mii(ifr);
3940                 if (!mii)
3941                         return -EINVAL;
3942
3943                 mii->phy_id = 0;
3944                 /* Fall Through */
3945         case SIOCGMIIREG:
3946                 /*
3947                  * We do this again just in case we were called by SIOCGMIIREG
3948                  * instead of SIOCGMIIPHY.
3949                  */
3950                 mii = if_mii(ifr);
3951                 if (!mii)
3952                         return -EINVAL;
3953
3954
3955                 if (mii->reg_num == 1) {
3956                         struct bonding *bond = netdev_priv(bond_dev);
3957                         mii->val_out = 0;
3958                         read_lock(&bond->lock);
3959                         read_lock(&bond->curr_slave_lock);
3960                         if (netif_carrier_ok(bond->dev))
3961                                 mii->val_out = BMSR_LSTATUS;
3962
3963                         read_unlock(&bond->curr_slave_lock);
3964                         read_unlock(&bond->lock);
3965                 }
3966
3967                 return 0;
3968         case BOND_INFO_QUERY_OLD:
3969         case SIOCBONDINFOQUERY:
3970                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3971
3972                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3973                         return -EFAULT;
3974
3975                 res = bond_info_query(bond_dev, &k_binfo);
3976                 if (res == 0 &&
3977                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3978                         return -EFAULT;
3979
3980                 return res;
3981         case BOND_SLAVE_INFO_QUERY_OLD:
3982         case SIOCBONDSLAVEINFOQUERY:
3983                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3984
3985                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3986                         return -EFAULT;
3987
3988                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3989                 if (res == 0 &&
3990                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3991                         return -EFAULT;
3992
3993                 return res;
3994         default:
3995                 /* Go on */
3996                 break;
3997         }
3998
3999         if (!capable(CAP_NET_ADMIN))
4000                 return -EPERM;
4001
4002         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
4003
4004         pr_debug("slave_dev=%p:\n", slave_dev);
4005
4006         if (!slave_dev)
4007                 res = -ENODEV;
4008         else {
4009                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
4010                 switch (cmd) {
4011                 case BOND_ENSLAVE_OLD:
4012                 case SIOCBONDENSLAVE:
4013                         res = bond_enslave(bond_dev, slave_dev);
4014                         break;
4015                 case BOND_RELEASE_OLD:
4016                 case SIOCBONDRELEASE:
4017                         res = bond_release(bond_dev, slave_dev);
4018                         break;
4019                 case BOND_SETHWADDR_OLD:
4020                 case SIOCBONDSETHWADDR:
4021                         res = bond_sethwaddr(bond_dev, slave_dev);
4022                         break;
4023                 case BOND_CHANGE_ACTIVE_OLD:
4024                 case SIOCBONDCHANGEACTIVE:
4025                         res = bond_ioctl_change_active(bond_dev, slave_dev);
4026                         break;
4027                 default:
4028                         res = -EOPNOTSUPP;
4029                 }
4030
4031                 dev_put(slave_dev);
4032         }
4033
4034         return res;
4035 }
4036
4037 static bool bond_addr_in_mc_list(unsigned char *addr,
4038                                  struct netdev_hw_addr_list *list,
4039                                  int addrlen)
4040 {
4041         struct netdev_hw_addr *ha;
4042
4043         netdev_hw_addr_list_for_each(ha, list)
4044                 if (!memcmp(ha->addr, addr, addrlen))
4045                         return true;
4046
4047         return false;
4048 }
4049
4050 static void bond_set_multicast_list(struct net_device *bond_dev)
4051 {
4052         struct bonding *bond = netdev_priv(bond_dev);
4053         struct netdev_hw_addr *ha;
4054         bool found;
4055
4056         /*
4057          * Do promisc before checking multicast_mode
4058          */
4059         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
4060                 /*
4061                  * FIXME: Need to handle the error when one of the multi-slaves
4062                  * encounters error.
4063                  */
4064                 bond_set_promiscuity(bond, 1);
4065
4066
4067         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
4068                 bond_set_promiscuity(bond, -1);
4069
4070
4071         /* set allmulti flag to slaves */
4072         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
4073                 /*
4074                  * FIXME: Need to handle the error when one of the multi-slaves
4075                  * encounters error.
4076                  */
4077                 bond_set_allmulti(bond, 1);
4078
4079
4080         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
4081                 bond_set_allmulti(bond, -1);
4082
4083
4084         read_lock(&bond->lock);
4085
4086         bond->flags = bond_dev->flags;
4087
4088         /* looking for addresses to add to slaves' mc list */
4089         netdev_for_each_mc_addr(ha, bond_dev) {
4090                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
4091                                              bond_dev->addr_len);
4092                 if (!found)
4093                         bond_mc_add(bond, ha->addr);
4094         }
4095
4096         /* looking for addresses to delete from slaves' list */
4097         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
4098                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
4099                                              bond_dev->addr_len);
4100                 if (!found)
4101                         bond_mc_del(bond, ha->addr);
4102         }
4103
4104         /* save master's multicast list */
4105         __hw_addr_flush(&bond->mc_list);
4106         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
4107                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
4108
4109         read_unlock(&bond->lock);
4110 }
4111
4112 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
4113 {
4114         struct bonding *bond = netdev_priv(dev);
4115         struct slave *slave = bond->first_slave;
4116
4117         if (slave) {
4118                 const struct net_device_ops *slave_ops
4119                         = slave->dev->netdev_ops;
4120                 if (slave_ops->ndo_neigh_setup)
4121                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
4122         }
4123         return 0;
4124 }
4125
4126 /*
4127  * Change the MTU of all of a master's slaves to match the master
4128  */
4129 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4130 {
4131         struct bonding *bond = netdev_priv(bond_dev);
4132         struct slave *slave, *stop_at;
4133         int res = 0;
4134         int i;
4135
4136         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
4137                  (bond_dev ? bond_dev->name : "None"), new_mtu);
4138
4139         /* Can't hold bond->lock with bh disabled here since
4140          * some base drivers panic. On the other hand we can't
4141          * hold bond->lock without bh disabled because we'll
4142          * deadlock. The only solution is to rely on the fact
4143          * that we're under rtnl_lock here, and the slaves
4144          * list won't change. This doesn't solve the problem
4145          * of setting the slave's MTU while it is
4146          * transmitting, but the assumption is that the base
4147          * driver can handle that.
4148          *
4149          * TODO: figure out a way to safely iterate the slaves
4150          * list, but without holding a lock around the actual
4151          * call to the base driver.
4152          */
4153
4154         bond_for_each_slave(bond, slave, i) {
4155                 pr_debug("s %p s->p %p c_m %p\n",
4156                          slave,
4157                          slave->prev,
4158                          slave->dev->netdev_ops->ndo_change_mtu);
4159
4160                 res = dev_set_mtu(slave->dev, new_mtu);
4161
4162                 if (res) {
4163                         /* If we failed to set the slave's mtu to the new value
4164                          * we must abort the operation even in ACTIVE_BACKUP
4165                          * mode, because if we allow the backup slaves to have
4166                          * different mtu values than the active slave we'll
4167                          * need to change their mtu when doing a failover. That
4168                          * means changing their mtu from timer context, which
4169                          * is probably not a good idea.
4170                          */
4171                         pr_debug("err %d %s\n", res, slave->dev->name);
4172                         goto unwind;
4173                 }
4174         }
4175
4176         bond_dev->mtu = new_mtu;
4177
4178         return 0;
4179
4180 unwind:
4181         /* unwind from head to the slave that failed */
4182         stop_at = slave;
4183         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4184                 int tmp_res;
4185
4186                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4187                 if (tmp_res) {
4188                         pr_debug("unwind err %d dev %s\n",
4189                                  tmp_res, slave->dev->name);
4190                 }
4191         }
4192
4193         return res;
4194 }
4195
4196 /*
4197  * Change HW address
4198  *
4199  * Note that many devices must be down to change the HW address, and
4200  * downing the master releases all slaves.  We can make bonds full of
4201  * bonding devices to test this, however.
4202  */
4203 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4204 {
4205         struct bonding *bond = netdev_priv(bond_dev);
4206         struct sockaddr *sa = addr, tmp_sa;
4207         struct slave *slave, *stop_at;
4208         int res = 0;
4209         int i;
4210
4211         if (bond->params.mode == BOND_MODE_ALB)
4212                 return bond_alb_set_mac_address(bond_dev, addr);
4213
4214
4215         pr_debug("bond=%p, name=%s\n",
4216                  bond, bond_dev ? bond_dev->name : "None");
4217
4218         /*
4219          * If fail_over_mac is set to active, do nothing and return
4220          * success.  Returning an error causes ifenslave to fail.
4221          */
4222         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4223                 return 0;
4224
4225         if (!is_valid_ether_addr(sa->sa_data))
4226                 return -EADDRNOTAVAIL;
4227
4228         /* Can't hold bond->lock with bh disabled here since
4229          * some base drivers panic. On the other hand we can't
4230          * hold bond->lock without bh disabled because we'll
4231          * deadlock. The only solution is to rely on the fact
4232          * that we're under rtnl_lock here, and the slaves
4233          * list won't change. This doesn't solve the problem
4234          * of setting the slave's hw address while it is
4235          * transmitting, but the assumption is that the base
4236          * driver can handle that.
4237          *
4238          * TODO: figure out a way to safely iterate the slaves
4239          * list, but without holding a lock around the actual
4240          * call to the base driver.
4241          */
4242
4243         bond_for_each_slave(bond, slave, i) {
4244                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4245                 pr_debug("slave %p %s\n", slave, slave->dev->name);
4246
4247                 if (slave_ops->ndo_set_mac_address == NULL) {
4248                         res = -EOPNOTSUPP;
4249                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4250                         goto unwind;
4251                 }
4252
4253                 res = dev_set_mac_address(slave->dev, addr);
4254                 if (res) {
4255                         /* TODO: consider downing the slave
4256                          * and retry ?
4257                          * User should expect communications
4258                          * breakage anyway until ARP finish
4259                          * updating, so...
4260                          */
4261                         pr_debug("err %d %s\n", res, slave->dev->name);
4262                         goto unwind;
4263                 }
4264         }
4265
4266         /* success */
4267         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4268         return 0;
4269
4270 unwind:
4271         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4272         tmp_sa.sa_family = bond_dev->type;
4273
4274         /* unwind from head to the slave that failed */
4275         stop_at = slave;
4276         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4277                 int tmp_res;
4278
4279                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4280                 if (tmp_res) {
4281                         pr_debug("unwind err %d dev %s\n",
4282                                  tmp_res, slave->dev->name);
4283                 }
4284         }
4285
4286         return res;
4287 }
4288
4289 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4290 {
4291         struct bonding *bond = netdev_priv(bond_dev);
4292         struct slave *slave, *start_at;
4293         int i, slave_no, res = 1;
4294         struct iphdr *iph = ip_hdr(skb);
4295
4296         read_lock(&bond->lock);
4297
4298         if (!BOND_IS_OK(bond))
4299                 goto out;
4300         /*
4301          * Start with the curr_active_slave that joined the bond as the
4302          * default for sending IGMP traffic.  For failover purposes one
4303          * needs to maintain some consistency for the interface that will
4304          * send the join/membership reports.  The curr_active_slave found
4305          * will send all of this type of traffic.
4306          */
4307         if ((iph->protocol == IPPROTO_IGMP) &&
4308             (skb->protocol == htons(ETH_P_IP))) {
4309
4310                 read_lock(&bond->curr_slave_lock);
4311                 slave = bond->curr_active_slave;
4312                 read_unlock(&bond->curr_slave_lock);
4313
4314                 if (!slave)
4315                         goto out;
4316         } else {
4317                 /*
4318                  * Concurrent TX may collide on rr_tx_counter; we accept
4319                  * that as being rare enough not to justify using an
4320                  * atomic op here.
4321                  */
4322                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4323
4324                 bond_for_each_slave(bond, slave, i) {
4325                         slave_no--;
4326                         if (slave_no < 0)
4327                                 break;
4328                 }
4329         }
4330
4331         start_at = slave;
4332         bond_for_each_slave_from(bond, slave, i, start_at) {
4333                 if (IS_UP(slave->dev) &&
4334                     (slave->link == BOND_LINK_UP) &&
4335                     (slave->state == BOND_STATE_ACTIVE)) {
4336                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4337                         break;
4338                 }
4339         }
4340
4341 out:
4342         if (res) {
4343                 /* no suitable interface, frame not sent */
4344                 dev_kfree_skb(skb);
4345         }
4346         read_unlock(&bond->lock);
4347         return NETDEV_TX_OK;
4348 }
4349
4350
4351 /*
4352  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4353  * the bond has a usable interface.
4354  */
4355 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4356 {
4357         struct bonding *bond = netdev_priv(bond_dev);
4358         int res = 1;
4359
4360         read_lock(&bond->lock);
4361         read_lock(&bond->curr_slave_lock);
4362
4363         if (!BOND_IS_OK(bond))
4364                 goto out;
4365
4366         if (!bond->curr_active_slave)
4367                 goto out;
4368
4369         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4370
4371 out:
4372         if (res)
4373                 /* no suitable interface, frame not sent */
4374                 dev_kfree_skb(skb);
4375
4376         read_unlock(&bond->curr_slave_lock);
4377         read_unlock(&bond->lock);
4378         return NETDEV_TX_OK;
4379 }
4380
4381 /*
4382  * In bond_xmit_xor() , we determine the output device by using a pre-
4383  * determined xmit_hash_policy(), If the selected device is not enabled,
4384  * find the next active slave.
4385  */
4386 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4387 {
4388         struct bonding *bond = netdev_priv(bond_dev);
4389         struct slave *slave, *start_at;
4390         int slave_no;
4391         int i;
4392         int res = 1;
4393
4394         read_lock(&bond->lock);
4395
4396         if (!BOND_IS_OK(bond))
4397                 goto out;
4398
4399         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4400
4401         bond_for_each_slave(bond, slave, i) {
4402                 slave_no--;
4403                 if (slave_no < 0)
4404                         break;
4405         }
4406
4407         start_at = slave;
4408
4409         bond_for_each_slave_from(bond, slave, i, start_at) {
4410                 if (IS_UP(slave->dev) &&
4411                     (slave->link == BOND_LINK_UP) &&
4412                     (slave->state == BOND_STATE_ACTIVE)) {
4413                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4414                         break;
4415                 }
4416         }
4417
4418 out:
4419         if (res) {
4420                 /* no suitable interface, frame not sent */
4421                 dev_kfree_skb(skb);
4422         }
4423         read_unlock(&bond->lock);
4424         return NETDEV_TX_OK;
4425 }
4426
4427 /*
4428  * in broadcast mode, we send everything to all usable interfaces.
4429  */
4430 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4431 {
4432         struct bonding *bond = netdev_priv(bond_dev);
4433         struct slave *slave, *start_at;
4434         struct net_device *tx_dev = NULL;
4435         int i;
4436         int res = 1;
4437
4438         read_lock(&bond->lock);
4439
4440         if (!BOND_IS_OK(bond))
4441                 goto out;
4442
4443         read_lock(&bond->curr_slave_lock);
4444         start_at = bond->curr_active_slave;
4445         read_unlock(&bond->curr_slave_lock);
4446
4447         if (!start_at)
4448                 goto out;
4449
4450         bond_for_each_slave_from(bond, slave, i, start_at) {
4451                 if (IS_UP(slave->dev) &&
4452                     (slave->link == BOND_LINK_UP) &&
4453                     (slave->state == BOND_STATE_ACTIVE)) {
4454                         if (tx_dev) {
4455                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4456                                 if (!skb2) {
4457                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4458                                                bond_dev->name);
4459                                         continue;
4460                                 }
4461
4462                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4463                                 if (res) {
4464                                         dev_kfree_skb(skb2);
4465                                         continue;
4466                                 }
4467                         }
4468                         tx_dev = slave->dev;
4469                 }
4470         }
4471
4472         if (tx_dev)
4473                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4474
4475 out:
4476         if (res)
4477                 /* no suitable interface, frame not sent */
4478                 dev_kfree_skb(skb);
4479
4480         /* frame sent to all suitable interfaces */
4481         read_unlock(&bond->lock);
4482         return NETDEV_TX_OK;
4483 }
4484
4485 /*------------------------- Device initialization ---------------------------*/
4486
4487 static void bond_set_xmit_hash_policy(struct bonding *bond)
4488 {
4489         switch (bond->params.xmit_policy) {
4490         case BOND_XMIT_POLICY_LAYER23:
4491                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4492                 break;
4493         case BOND_XMIT_POLICY_LAYER34:
4494                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4495                 break;
4496         case BOND_XMIT_POLICY_LAYER2:
4497         default:
4498                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4499                 break;
4500         }
4501 }
4502
4503 /*
4504  * Lookup the slave that corresponds to a qid
4505  */
4506 static inline int bond_slave_override(struct bonding *bond,
4507                                       struct sk_buff *skb)
4508 {
4509         int i, res = 1;
4510         struct slave *slave = NULL;
4511         struct slave *check_slave;
4512
4513         read_lock(&bond->lock);
4514
4515         if (!BOND_IS_OK(bond) || !skb->queue_mapping)
4516                 goto out;
4517
4518         /* Find out if any slaves have the same mapping as this skb. */
4519         bond_for_each_slave(bond, check_slave, i) {
4520                 if (check_slave->queue_id == skb->queue_mapping) {
4521                         slave = check_slave;
4522                         break;
4523                 }
4524         }
4525
4526         /* If the slave isn't UP, use default transmit policy. */
4527         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4528             (slave->link == BOND_LINK_UP)) {
4529                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4530         }
4531
4532 out:
4533         read_unlock(&bond->lock);
4534         return res;
4535 }
4536
4537 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4538 {
4539         /*
4540          * This helper function exists to help dev_pick_tx get the correct
4541          * destination queue.  Using a helper function skips the a call to
4542          * skb_tx_hash and will put the skbs in the queue we expect on their
4543          * way down to the bonding driver.
4544          */
4545         return skb->queue_mapping;
4546 }
4547
4548 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4549 {
4550         struct bonding *bond = netdev_priv(dev);
4551
4552         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4553                 if (!bond_slave_override(bond, skb))
4554                         return NETDEV_TX_OK;
4555         }
4556
4557         switch (bond->params.mode) {
4558         case BOND_MODE_ROUNDROBIN:
4559                 return bond_xmit_roundrobin(skb, dev);
4560         case BOND_MODE_ACTIVEBACKUP:
4561                 return bond_xmit_activebackup(skb, dev);
4562         case BOND_MODE_XOR:
4563                 return bond_xmit_xor(skb, dev);
4564         case BOND_MODE_BROADCAST:
4565                 return bond_xmit_broadcast(skb, dev);
4566         case BOND_MODE_8023AD:
4567                 return bond_3ad_xmit_xor(skb, dev);
4568         case BOND_MODE_ALB:
4569         case BOND_MODE_TLB:
4570                 return bond_alb_xmit(skb, dev);
4571         default:
4572                 /* Should never happen, mode already checked */
4573                 pr_err("%s: Error: Unknown bonding mode %d\n",
4574                        dev->name, bond->params.mode);
4575                 WARN_ON_ONCE(1);
4576                 dev_kfree_skb(skb);
4577                 return NETDEV_TX_OK;
4578         }
4579 }
4580
4581
4582 /*
4583  * set bond mode specific net device operations
4584  */
4585 void bond_set_mode_ops(struct bonding *bond, int mode)
4586 {
4587         struct net_device *bond_dev = bond->dev;
4588
4589         switch (mode) {
4590         case BOND_MODE_ROUNDROBIN:
4591                 break;
4592         case BOND_MODE_ACTIVEBACKUP:
4593                 break;
4594         case BOND_MODE_XOR:
4595                 bond_set_xmit_hash_policy(bond);
4596                 break;
4597         case BOND_MODE_BROADCAST:
4598                 break;
4599         case BOND_MODE_8023AD:
4600                 bond_set_master_3ad_flags(bond);
4601                 bond_set_xmit_hash_policy(bond);
4602                 break;
4603         case BOND_MODE_ALB:
4604                 bond_set_master_alb_flags(bond);
4605                 /* FALLTHRU */
4606         case BOND_MODE_TLB:
4607                 break;
4608         default:
4609                 /* Should never happen, mode already checked */
4610                 pr_err("%s: Error: Unknown bonding mode %d\n",
4611                        bond_dev->name, mode);
4612                 break;
4613         }
4614 }
4615
4616 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4617                                     struct ethtool_drvinfo *drvinfo)
4618 {
4619         strncpy(drvinfo->driver, DRV_NAME, 32);
4620         strncpy(drvinfo->version, DRV_VERSION, 32);
4621         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4622 }
4623
4624 static const struct ethtool_ops bond_ethtool_ops = {
4625         .get_drvinfo            = bond_ethtool_get_drvinfo,
4626         .get_link               = ethtool_op_get_link,
4627         .get_tx_csum            = ethtool_op_get_tx_csum,
4628         .get_sg                 = ethtool_op_get_sg,
4629         .get_tso                = ethtool_op_get_tso,
4630         .get_ufo                = ethtool_op_get_ufo,
4631         .get_flags              = ethtool_op_get_flags,
4632 };
4633
4634 static const struct net_device_ops bond_netdev_ops = {
4635         .ndo_init               = bond_init,
4636         .ndo_uninit             = bond_uninit,
4637         .ndo_open               = bond_open,
4638         .ndo_stop               = bond_close,
4639         .ndo_start_xmit         = bond_start_xmit,
4640         .ndo_select_queue       = bond_select_queue,
4641         .ndo_get_stats64        = bond_get_stats,
4642         .ndo_do_ioctl           = bond_do_ioctl,
4643         .ndo_set_multicast_list = bond_set_multicast_list,
4644         .ndo_change_mtu         = bond_change_mtu,
4645         .ndo_set_mac_address    = bond_set_mac_address,
4646         .ndo_neigh_setup        = bond_neigh_setup,
4647         .ndo_vlan_rx_register   = bond_vlan_rx_register,
4648         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4649         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4650 #ifdef CONFIG_NET_POLL_CONTROLLER
4651         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4652         .ndo_poll_controller    = bond_poll_controller,
4653 #endif
4654 };
4655
4656 static void bond_destructor(struct net_device *bond_dev)
4657 {
4658         struct bonding *bond = netdev_priv(bond_dev);
4659         if (bond->wq)
4660                 destroy_workqueue(bond->wq);
4661         free_netdev(bond_dev);
4662 }
4663
4664 static void bond_setup(struct net_device *bond_dev)
4665 {
4666         struct bonding *bond = netdev_priv(bond_dev);
4667
4668         /* initialize rwlocks */
4669         rwlock_init(&bond->lock);
4670         rwlock_init(&bond->curr_slave_lock);
4671
4672         bond->params = bonding_defaults;
4673
4674         /* Initialize pointers */
4675         bond->dev = bond_dev;
4676         INIT_LIST_HEAD(&bond->vlan_list);
4677
4678         /* Initialize the device entry points */
4679         ether_setup(bond_dev);
4680         bond_dev->netdev_ops = &bond_netdev_ops;
4681         bond_dev->ethtool_ops = &bond_ethtool_ops;
4682         bond_set_mode_ops(bond, bond->params.mode);
4683
4684         bond_dev->destructor = bond_destructor;
4685
4686         /* Initialize the device options */
4687         bond_dev->tx_queue_len = 0;
4688         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4689         bond_dev->priv_flags |= IFF_BONDING;
4690         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
4691
4692         if (bond->params.arp_interval)
4693                 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4694
4695         /* At first, we block adding VLANs. That's the only way to
4696          * prevent problems that occur when adding VLANs over an
4697          * empty bond. The block will be removed once non-challenged
4698          * slaves are enslaved.
4699          */
4700         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4701
4702         /* don't acquire bond device's netif_tx_lock when
4703          * transmitting */
4704         bond_dev->features |= NETIF_F_LLTX;
4705
4706         /* By default, we declare the bond to be fully
4707          * VLAN hardware accelerated capable. Special
4708          * care is taken in the various xmit functions
4709          * when there are slaves that are not hw accel
4710          * capable
4711          */
4712         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4713                                NETIF_F_HW_VLAN_RX |
4714                                NETIF_F_HW_VLAN_FILTER);
4715
4716         /* By default, we enable GRO on bonding devices.
4717          * Actual support requires lowlevel drivers are GRO ready.
4718          */
4719         bond_dev->features |= NETIF_F_GRO;
4720 }
4721
4722 static void bond_work_cancel_all(struct bonding *bond)
4723 {
4724         write_lock_bh(&bond->lock);
4725         bond->kill_timers = 1;
4726         write_unlock_bh(&bond->lock);
4727
4728         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4729                 cancel_delayed_work(&bond->mii_work);
4730
4731         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4732                 cancel_delayed_work(&bond->arp_work);
4733
4734         if (bond->params.mode == BOND_MODE_ALB &&
4735             delayed_work_pending(&bond->alb_work))
4736                 cancel_delayed_work(&bond->alb_work);
4737
4738         if (bond->params.mode == BOND_MODE_8023AD &&
4739             delayed_work_pending(&bond->ad_work))
4740                 cancel_delayed_work(&bond->ad_work);
4741
4742         if (delayed_work_pending(&bond->mcast_work))
4743                 cancel_delayed_work(&bond->mcast_work);
4744 }
4745
4746 /*
4747 * Destroy a bonding device.
4748 * Must be under rtnl_lock when this function is called.
4749 */
4750 static void bond_uninit(struct net_device *bond_dev)
4751 {
4752         struct bonding *bond = netdev_priv(bond_dev);
4753         struct vlan_entry *vlan, *tmp;
4754
4755         bond_netpoll_cleanup(bond_dev);
4756
4757         /* Release the bonded slaves */
4758         bond_release_all(bond_dev);
4759
4760         list_del(&bond->bond_list);
4761
4762         bond_work_cancel_all(bond);
4763
4764         bond_remove_proc_entry(bond);
4765
4766         __hw_addr_flush(&bond->mc_list);
4767
4768         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4769                 list_del(&vlan->vlan_list);
4770                 kfree(vlan);
4771         }
4772 }
4773
4774 /*------------------------- Module initialization ---------------------------*/
4775
4776 /*
4777  * Convert string input module parms.  Accept either the
4778  * number of the mode or its string name.  A bit complicated because
4779  * some mode names are substrings of other names, and calls from sysfs
4780  * may have whitespace in the name (trailing newlines, for example).
4781  */
4782 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4783 {
4784         int modeint = -1, i, rv;
4785         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4786
4787         for (p = (char *)buf; *p; p++)
4788                 if (!(isdigit(*p) || isspace(*p)))
4789                         break;
4790
4791         if (*p)
4792                 rv = sscanf(buf, "%20s", modestr);
4793         else
4794                 rv = sscanf(buf, "%d", &modeint);
4795
4796         if (!rv)
4797                 return -1;
4798
4799         for (i = 0; tbl[i].modename; i++) {
4800                 if (modeint == tbl[i].mode)
4801                         return tbl[i].mode;
4802                 if (strcmp(modestr, tbl[i].modename) == 0)
4803                         return tbl[i].mode;
4804         }
4805
4806         return -1;
4807 }
4808
4809 static int bond_check_params(struct bond_params *params)
4810 {
4811         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4812
4813         /*
4814          * Convert string parameters.
4815          */
4816         if (mode) {
4817                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4818                 if (bond_mode == -1) {
4819                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4820                                mode == NULL ? "NULL" : mode);
4821                         return -EINVAL;
4822                 }
4823         }
4824
4825         if (xmit_hash_policy) {
4826                 if ((bond_mode != BOND_MODE_XOR) &&
4827                     (bond_mode != BOND_MODE_8023AD)) {
4828                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4829                                bond_mode_name(bond_mode));
4830                 } else {
4831                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4832                                                         xmit_hashtype_tbl);
4833                         if (xmit_hashtype == -1) {
4834                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4835                                        xmit_hash_policy == NULL ? "NULL" :
4836                                        xmit_hash_policy);
4837                                 return -EINVAL;
4838                         }
4839                 }
4840         }
4841
4842         if (lacp_rate) {
4843                 if (bond_mode != BOND_MODE_8023AD) {
4844                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4845                                 bond_mode_name(bond_mode));
4846                 } else {
4847                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4848                         if (lacp_fast == -1) {
4849                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4850                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4851                                 return -EINVAL;
4852                         }
4853                 }
4854         }
4855
4856         if (ad_select) {
4857                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4858                 if (params->ad_select == -1) {
4859                         pr_err("Error: Invalid ad_select \"%s\"\n",
4860                                ad_select == NULL ? "NULL" : ad_select);
4861                         return -EINVAL;
4862                 }
4863
4864                 if (bond_mode != BOND_MODE_8023AD) {
4865                         pr_warning("ad_select param only affects 802.3ad mode\n");
4866                 }
4867         } else {
4868                 params->ad_select = BOND_AD_STABLE;
4869         }
4870
4871         if (max_bonds < 0) {
4872                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4873                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4874                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4875         }
4876
4877         if (miimon < 0) {
4878                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4879                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4880                 miimon = BOND_LINK_MON_INTERV;
4881         }
4882
4883         if (updelay < 0) {
4884                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4885                            updelay, INT_MAX);
4886                 updelay = 0;
4887         }
4888
4889         if (downdelay < 0) {
4890                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4891                            downdelay, INT_MAX);
4892                 downdelay = 0;
4893         }
4894
4895         if ((use_carrier != 0) && (use_carrier != 1)) {
4896                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4897                            use_carrier);
4898                 use_carrier = 1;
4899         }
4900
4901         if (num_grat_arp < 0 || num_grat_arp > 255) {
4902                 pr_warning("Warning: num_grat_arp (%d) not in range 0-255 so it was reset to 1\n",
4903                            num_grat_arp);
4904                 num_grat_arp = 1;
4905         }
4906
4907         if (num_unsol_na < 0 || num_unsol_na > 255) {
4908                 pr_warning("Warning: num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4909                            num_unsol_na);
4910                 num_unsol_na = 1;
4911         }
4912
4913         /* reset values for 802.3ad */
4914         if (bond_mode == BOND_MODE_8023AD) {
4915                 if (!miimon) {
4916                         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");
4917                         pr_warning("Forcing miimon to 100msec\n");
4918                         miimon = 100;
4919                 }
4920         }
4921
4922         if (tx_queues < 1 || tx_queues > 255) {
4923                 pr_warning("Warning: tx_queues (%d) should be between "
4924                            "1 and 255, resetting to %d\n",
4925                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4926                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4927         }
4928
4929         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4930                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4931                            "not of valid value (0/1), so it was set to "
4932                            "0\n", all_slaves_active);
4933                 all_slaves_active = 0;
4934         }
4935
4936         /* reset values for TLB/ALB */
4937         if ((bond_mode == BOND_MODE_TLB) ||
4938             (bond_mode == BOND_MODE_ALB)) {
4939                 if (!miimon) {
4940                         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");
4941                         pr_warning("Forcing miimon to 100msec\n");
4942                         miimon = 100;
4943                 }
4944         }
4945
4946         if (bond_mode == BOND_MODE_ALB) {
4947                 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",
4948                           updelay);
4949         }
4950
4951         if (!miimon) {
4952                 if (updelay || downdelay) {
4953                         /* just warn the user the up/down delay will have
4954                          * no effect since miimon is zero...
4955                          */
4956                         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",
4957                                    updelay, downdelay);
4958                 }
4959         } else {
4960                 /* don't allow arp monitoring */
4961                 if (arp_interval) {
4962                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4963                                    miimon, arp_interval);
4964                         arp_interval = 0;
4965                 }
4966
4967                 if ((updelay % miimon) != 0) {
4968                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4969                                    updelay, miimon,
4970                                    (updelay / miimon) * miimon);
4971                 }
4972
4973                 updelay /= miimon;
4974
4975                 if ((downdelay % miimon) != 0) {
4976                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4977                                    downdelay, miimon,
4978                                    (downdelay / miimon) * miimon);
4979                 }
4980
4981                 downdelay /= miimon;
4982         }
4983
4984         if (arp_interval < 0) {
4985                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4986                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4987                 arp_interval = BOND_LINK_ARP_INTERV;
4988         }
4989
4990         for (arp_ip_count = 0;
4991              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4992              arp_ip_count++) {
4993                 /* not complete check, but should be good enough to
4994                    catch mistakes */
4995                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4996                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4997                                    arp_ip_target[arp_ip_count]);
4998                         arp_interval = 0;
4999                 } else {
5000                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
5001                         arp_target[arp_ip_count] = ip;
5002                 }
5003         }
5004
5005         if (arp_interval && !arp_ip_count) {
5006                 /* don't allow arping if no arp_ip_target given... */
5007                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
5008                            arp_interval);
5009                 arp_interval = 0;
5010         }
5011
5012         if (arp_validate) {
5013                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
5014                         pr_err("arp_validate only supported in active-backup mode\n");
5015                         return -EINVAL;
5016                 }
5017                 if (!arp_interval) {
5018                         pr_err("arp_validate requires arp_interval\n");
5019                         return -EINVAL;
5020                 }
5021
5022                 arp_validate_value = bond_parse_parm(arp_validate,
5023                                                      arp_validate_tbl);
5024                 if (arp_validate_value == -1) {
5025                         pr_err("Error: invalid arp_validate \"%s\"\n",
5026                                arp_validate == NULL ? "NULL" : arp_validate);
5027                         return -EINVAL;
5028                 }
5029         } else
5030                 arp_validate_value = 0;
5031
5032         if (miimon) {
5033                 pr_info("MII link monitoring set to %d ms\n", miimon);
5034         } else if (arp_interval) {
5035                 int i;
5036
5037                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5038                         arp_interval,
5039                         arp_validate_tbl[arp_validate_value].modename,
5040                         arp_ip_count);
5041
5042                 for (i = 0; i < arp_ip_count; i++)
5043                         pr_info(" %s", arp_ip_target[i]);
5044
5045                 pr_info("\n");
5046
5047         } else if (max_bonds) {
5048                 /* miimon and arp_interval not set, we need one so things
5049                  * work as expected, see bonding.txt for details
5050                  */
5051                 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");
5052         }
5053
5054         if (primary && !USES_PRIMARY(bond_mode)) {
5055                 /* currently, using a primary only makes sense
5056                  * in active backup, TLB or ALB modes
5057                  */
5058                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
5059                            primary, bond_mode_name(bond_mode));
5060                 primary = NULL;
5061         }
5062
5063         if (primary && primary_reselect) {
5064                 primary_reselect_value = bond_parse_parm(primary_reselect,
5065                                                          pri_reselect_tbl);
5066                 if (primary_reselect_value == -1) {
5067                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
5068                                primary_reselect ==
5069                                         NULL ? "NULL" : primary_reselect);
5070                         return -EINVAL;
5071                 }
5072         } else {
5073                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5074         }
5075
5076         if (fail_over_mac) {
5077                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
5078                                                       fail_over_mac_tbl);
5079                 if (fail_over_mac_value == -1) {
5080                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
5081                                arp_validate == NULL ? "NULL" : arp_validate);
5082                         return -EINVAL;
5083                 }
5084
5085                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5086                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
5087         } else {
5088                 fail_over_mac_value = BOND_FOM_NONE;
5089         }
5090
5091         /* fill params struct with the proper values */
5092         params->mode = bond_mode;
5093         params->xmit_policy = xmit_hashtype;
5094         params->miimon = miimon;
5095         params->num_grat_arp = num_grat_arp;
5096         params->num_unsol_na = num_unsol_na;
5097         params->arp_interval = arp_interval;
5098         params->arp_validate = arp_validate_value;
5099         params->updelay = updelay;
5100         params->downdelay = downdelay;
5101         params->use_carrier = use_carrier;
5102         params->lacp_fast = lacp_fast;
5103         params->primary[0] = 0;
5104         params->primary_reselect = primary_reselect_value;
5105         params->fail_over_mac = fail_over_mac_value;
5106         params->tx_queues = tx_queues;
5107         params->all_slaves_active = all_slaves_active;
5108
5109         if (primary) {
5110                 strncpy(params->primary, primary, IFNAMSIZ);
5111                 params->primary[IFNAMSIZ - 1] = 0;
5112         }
5113
5114         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5115
5116         return 0;
5117 }
5118
5119 static struct lock_class_key bonding_netdev_xmit_lock_key;
5120 static struct lock_class_key bonding_netdev_addr_lock_key;
5121
5122 static void bond_set_lockdep_class_one(struct net_device *dev,
5123                                        struct netdev_queue *txq,
5124                                        void *_unused)
5125 {
5126         lockdep_set_class(&txq->_xmit_lock,
5127                           &bonding_netdev_xmit_lock_key);
5128 }
5129
5130 static void bond_set_lockdep_class(struct net_device *dev)
5131 {
5132         lockdep_set_class(&dev->addr_list_lock,
5133                           &bonding_netdev_addr_lock_key);
5134         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
5135 }
5136
5137 /*
5138  * Called from registration process
5139  */
5140 static int bond_init(struct net_device *bond_dev)
5141 {
5142         struct bonding *bond = netdev_priv(bond_dev);
5143         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5144
5145         pr_debug("Begin bond_init for %s\n", bond_dev->name);
5146
5147         bond->wq = create_singlethread_workqueue(bond_dev->name);
5148         if (!bond->wq)
5149                 return -ENOMEM;
5150
5151         bond_set_lockdep_class(bond_dev);
5152
5153         netif_carrier_off(bond_dev);
5154
5155         bond_create_proc_entry(bond);
5156         list_add_tail(&bond->bond_list, &bn->dev_list);
5157
5158         bond_prepare_sysfs_group(bond);
5159
5160         __hw_addr_init(&bond->mc_list);
5161         return 0;
5162 }
5163
5164 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
5165 {
5166         if (tb[IFLA_ADDRESS]) {
5167                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
5168                         return -EINVAL;
5169                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
5170                         return -EADDRNOTAVAIL;
5171         }
5172         return 0;
5173 }
5174
5175 static struct rtnl_link_ops bond_link_ops __read_mostly = {
5176         .kind           = "bond",
5177         .priv_size      = sizeof(struct bonding),
5178         .setup          = bond_setup,
5179         .validate       = bond_validate,
5180 };
5181
5182 /* Create a new bond based on the specified name and bonding parameters.
5183  * If name is NULL, obtain a suitable "bond%d" name for us.
5184  * Caller must NOT hold rtnl_lock; we need to release it here before we
5185  * set up our sysfs entries.
5186  */
5187 int bond_create(struct net *net, const char *name)
5188 {
5189         struct net_device *bond_dev;
5190         int res;
5191
5192         rtnl_lock();
5193
5194         bond_dev = alloc_netdev_mq(sizeof(struct bonding), name ? name : "",
5195                                 bond_setup, tx_queues);
5196         if (!bond_dev) {
5197                 pr_err("%s: eek! can't alloc netdev!\n", name);
5198                 rtnl_unlock();
5199                 return -ENOMEM;
5200         }
5201
5202         dev_net_set(bond_dev, net);
5203         bond_dev->rtnl_link_ops = &bond_link_ops;
5204
5205         if (!name) {
5206                 res = dev_alloc_name(bond_dev, "bond%d");
5207                 if (res < 0)
5208                         goto out;
5209         }
5210
5211         res = register_netdevice(bond_dev);
5212
5213 out:
5214         rtnl_unlock();
5215         if (res < 0)
5216                 bond_destructor(bond_dev);
5217         return res;
5218 }
5219
5220 static int __net_init bond_net_init(struct net *net)
5221 {
5222         struct bond_net *bn = net_generic(net, bond_net_id);
5223
5224         bn->net = net;
5225         INIT_LIST_HEAD(&bn->dev_list);
5226
5227         bond_create_proc_dir(bn);
5228
5229         return 0;
5230 }
5231
5232 static void __net_exit bond_net_exit(struct net *net)
5233 {
5234         struct bond_net *bn = net_generic(net, bond_net_id);
5235
5236         bond_destroy_proc_dir(bn);
5237 }
5238
5239 static struct pernet_operations bond_net_ops = {
5240         .init = bond_net_init,
5241         .exit = bond_net_exit,
5242         .id   = &bond_net_id,
5243         .size = sizeof(struct bond_net),
5244 };
5245
5246 static int __init bonding_init(void)
5247 {
5248         int i;
5249         int res;
5250
5251         pr_info("%s", version);
5252
5253         res = bond_check_params(&bonding_defaults);
5254         if (res)
5255                 goto out;
5256
5257         res = register_pernet_subsys(&bond_net_ops);
5258         if (res)
5259                 goto out;
5260
5261         res = rtnl_link_register(&bond_link_ops);
5262         if (res)
5263                 goto err_link;
5264
5265         for (i = 0; i < max_bonds; i++) {
5266                 res = bond_create(&init_net, NULL);
5267                 if (res)
5268                         goto err;
5269         }
5270
5271         res = bond_create_sysfs();
5272         if (res)
5273                 goto err;
5274
5275         register_netdevice_notifier(&bond_netdev_notifier);
5276         register_inetaddr_notifier(&bond_inetaddr_notifier);
5277         bond_register_ipv6_notifier();
5278 out:
5279         return res;
5280 err:
5281         rtnl_link_unregister(&bond_link_ops);
5282 err_link:
5283         unregister_pernet_subsys(&bond_net_ops);
5284         goto out;
5285
5286 }
5287
5288 static void __exit bonding_exit(void)
5289 {
5290         unregister_netdevice_notifier(&bond_netdev_notifier);
5291         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5292         bond_unregister_ipv6_notifier();
5293
5294         bond_destroy_sysfs();
5295
5296         rtnl_link_unregister(&bond_link_ops);
5297         unregister_pernet_subsys(&bond_net_ops);
5298 }
5299
5300 module_init(bonding_init);
5301 module_exit(bonding_exit);
5302 MODULE_LICENSE("GPL");
5303 MODULE_VERSION(DRV_VERSION);
5304 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5305 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5306 MODULE_ALIAS_RTNL_LINK("bond");