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 <linux/preempt.h>
  80 #include <net/route.h>
  81 #include <net/net_namespace.h>
  82 #include <net/netns/generic.h>
  83 #include "bonding.h"
  84 #include "bond_3ad.h"
  85 #include "bond_alb.h"
  86
  87 /*---------------------------- Module parameters ----------------------------*/
  88
  89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  90 #define BOND_LINK_MON_INTERV    0
  91 #define BOND_LINK_ARP_INTERV    0
  92
  93 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  94 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  95 static int num_grat_arp = 1;
  96 static int num_unsol_na = 1;
  97 static int miimon       = BOND_LINK_MON_INTERV;
  98 static int updelay;
  99 static int downdelay;
 100 static int use_carrier  = 1;
 101 static char *mode;
 102 static char *primary;
 103 static char *primary_reselect;
 104 static char *lacp_rate;
 105 static char *ad_select;
 106 static char *xmit_hash_policy;
 107 static int arp_interval = BOND_LINK_ARP_INTERV;
 108 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 109 static char *arp_validate;
 110 static char *fail_over_mac;
 111 static int all_slaves_active = 0;
 112 static struct bond_params bonding_defaults;
 113 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 114
 115 module_param(max_bonds, int, 0);
 116 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 117 module_param(tx_queues, int, 0);
 118 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 119 module_param(num_grat_arp, int, 0644);
 120 MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
 121 module_param(num_unsol_na, int, 0644);
 122 MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
 123 module_param(miimon, int, 0);
 124 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 125 module_param(updelay, int, 0);
 126 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 127 module_param(downdelay, int, 0);
 128 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 129                             "in milliseconds");
 130 module_param(use_carrier, int, 0);
 131 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 132                               "0 for off, 1 for on (default)");
 133 module_param(mode, charp, 0);
 134 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 135                        "1 for active-backup, 2 for balance-xor, "
 136                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 137                        "6 for balance-alb");
 138 module_param(primary, charp, 0);
 139 MODULE_PARM_DESC(primary, "Primary network device to use");
 140 module_param(primary_reselect, charp, 0);
 141 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 142                                    "once it comes up; "
 143                                    "0 for always (default), "
 144                                    "1 for only if speed of primary is "
 145                                    "better, "
 146                                    "2 for only on active slave "
 147                                    "failure");
 148 module_param(lacp_rate, charp, 0);
 149 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 150                             "(slow/fast)");
 151 module_param(ad_select, charp, 0);
 152 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
 153 module_param(xmit_hash_policy, charp, 0);
 154 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 155                                    ", 1 for layer 3+4");
 156 module_param(arp_interval, int, 0);
 157 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 158 module_param_array(arp_ip_target, charp, NULL, 0);
 159 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 160 module_param(arp_validate, charp, 0);
 161 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 162 module_param(fail_over_mac, charp, 0);
 163 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
 164 module_param(all_slaves_active, int, 0);
 165 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 166                                      "by setting active flag for all slaves.  "
 167                                      "0 for never (default), 1 for always.");
 168 module_param(resend_igmp, int, 0);
 169 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on link failure");
 170
 171 /*----------------------------- Global variables ----------------------------*/
 172
 173 #ifdef CONFIG_NET_POLL_CONTROLLER
 174 cpumask_var_t netpoll_block_tx;
 175 #endif
 176
 177 static const char * const version =
 178         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
 179
 180 int bond_net_id __read_mostly;
 181
 182 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 183 static int arp_ip_count;
 184 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 185 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 186 static int lacp_fast;
 187
 188 const struct bond_parm_tbl bond_lacp_tbl[] = {
 189 {       "slow",         AD_LACP_SLOW},
 190 {       "fast",         AD_LACP_FAST},
 191 {       NULL,           -1},
 192 };
 193
 194 const struct bond_parm_tbl bond_mode_tbl[] = {
 195 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 196 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 197 {       "balance-xor",          BOND_MODE_XOR},
 198 {       "broadcast",            BOND_MODE_BROADCAST},
 199 {       "802.3ad",              BOND_MODE_8023AD},
 200 {       "balance-tlb",          BOND_MODE_TLB},
 201 {       "balance-alb",          BOND_MODE_ALB},
 202 {       NULL,                   -1},
 203 };
 204
 205 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 206 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 207 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 208 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 209 {       NULL,                   -1},
 210 };
 211
 212 const struct bond_parm_tbl arp_validate_tbl[] = {
 213 {       "none",                 BOND_ARP_VALIDATE_NONE},
 214 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 215 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 216 {       "all",                  BOND_ARP_VALIDATE_ALL},
 217 {       NULL,                   -1},
 218 };
 219
 220 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 221 {       "none",                 BOND_FOM_NONE},
 222 {       "active",               BOND_FOM_ACTIVE},
 223 {       "follow",               BOND_FOM_FOLLOW},
 224 {       NULL,                   -1},
 225 };
 226
 227 const struct bond_parm_tbl pri_reselect_tbl[] = {
 228 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 229 {       "better",               BOND_PRI_RESELECT_BETTER},
 230 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 231 {       NULL,                   -1},
 232 };
 233
 234 struct bond_parm_tbl ad_select_tbl[] = {
 235 {       "stable",       BOND_AD_STABLE},
 236 {       "bandwidth",    BOND_AD_BANDWIDTH},
 237 {       "count",        BOND_AD_COUNT},
 238 {       NULL,           -1},
 239 };
 240
 241 /*-------------------------- Forward declarations ---------------------------*/
 242
 243 static void bond_send_gratuitous_arp(struct bonding *bond);
 244 static int bond_init(struct net_device *bond_dev);
 245 static void bond_uninit(struct net_device *bond_dev);
 246
 247 /*---------------------------- General routines -----------------------------*/
 248
 249 static const char *bond_mode_name(int mode)
 250 {
 251         static const char *names[] = {
 252                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 253                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 254                 [BOND_MODE_XOR] = "load balancing (xor)",
 255                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 256                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 257                 [BOND_MODE_TLB] = "transmit load balancing",
 258                 [BOND_MODE_ALB] = "adaptive load balancing",
 259         };
 260
 261         if (mode < 0 || mode > BOND_MODE_ALB)
 262                 return "unknown";
 263
 264         return names[mode];
 265 }
 266
 267 /*---------------------------------- VLAN -----------------------------------*/
 268
 269 /**
 270  * bond_add_vlan - add a new vlan id on bond
 271  * @bond: bond that got the notification
 272  * @vlan_id: the vlan id to add
 273  *
 274  * Returns -ENOMEM if allocation failed.
 275  */
 276 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 277 {
 278         struct vlan_entry *vlan;
 279
 280         pr_debug("bond: %s, vlan id %d\n",
 281                  (bond ? bond->dev->name : "None"), vlan_id);
 282
 283         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 284         if (!vlan)
 285                 return -ENOMEM;
 286
 287         INIT_LIST_HEAD(&vlan->vlan_list);
 288         vlan->vlan_id = vlan_id;
 289
 290         write_lock_bh(&bond->lock);
 291
 292         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 293
 294         write_unlock_bh(&bond->lock);
 295
 296         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 297
 298         return 0;
 299 }
 300
 301 /**
 302  * bond_del_vlan - delete a vlan id from bond
 303  * @bond: bond that got the notification
 304  * @vlan_id: the vlan id to delete
 305  *
 306  * returns -ENODEV if @vlan_id was not found in @bond.
 307  */
 308 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 309 {
 310         struct vlan_entry *vlan;
 311         int res = -ENODEV;
 312
 313         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 314
 315         block_netpoll_tx();
 316         write_lock_bh(&bond->lock);
 317
 318         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 319                 if (vlan->vlan_id == vlan_id) {
 320                         list_del(&vlan->vlan_list);
 321
 322                         if (bond_is_lb(bond))
 323                                 bond_alb_clear_vlan(bond, vlan_id);
 324
 325                         pr_debug("removed VLAN ID %d from bond %s\n",
 326                                  vlan_id, bond->dev->name);
 327
 328                         kfree(vlan);
 329
 330                         if (list_empty(&bond->vlan_list) &&
 331                             (bond->slave_cnt == 0)) {
 332                                 /* Last VLAN removed and no slaves, so
 333                                  * restore block on adding VLANs. This will
 334                                  * be removed once new slaves that are not
 335                                  * VLAN challenged will be added.
 336                                  */
 337                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 338                         }
 339
 340                         res = 0;
 341                         goto out;
 342                 }
 343         }
 344
 345         pr_debug("couldn't find VLAN ID %d in bond %s\n",
 346                  vlan_id, bond->dev->name);
 347
 348 out:
 349         write_unlock_bh(&bond->lock);
 350         unblock_netpoll_tx();
 351         return res;
 352 }
 353
 354 /**
 355  * bond_has_challenged_slaves
 356  * @bond: the bond we're working on
 357  *
 358  * Searches the slave list. Returns 1 if a vlan challenged slave
 359  * was found, 0 otherwise.
 360  *
 361  * Assumes bond->lock is held.
 362  */
 363 static int bond_has_challenged_slaves(struct bonding *bond)
 364 {
 365         struct slave *slave;
 366         int i;
 367
 368         bond_for_each_slave(bond, slave, i) {
 369                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 370                         pr_debug("found VLAN challenged slave - %s\n",
 371                                  slave->dev->name);
 372                         return 1;
 373                 }
 374         }
 375
 376         pr_debug("no VLAN challenged slaves found\n");
 377         return 0;
 378 }
 379
 380 /**
 381  * bond_next_vlan - safely skip to the next item in the vlans list.
 382  * @bond: the bond we're working on
 383  * @curr: item we're advancing from
 384  *
 385  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 386  * or @curr->next otherwise (even if it is @curr itself again).
 387  *
 388  * Caller must hold bond->lock
 389  */
 390 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 391 {
 392         struct vlan_entry *next, *last;
 393
 394         if (list_empty(&bond->vlan_list))
 395                 return NULL;
 396
 397         if (!curr) {
 398                 next = list_entry(bond->vlan_list.next,
 399                                   struct vlan_entry, vlan_list);
 400         } else {
 401                 last = list_entry(bond->vlan_list.prev,
 402                                   struct vlan_entry, vlan_list);
 403                 if (last == curr) {
 404                         next = list_entry(bond->vlan_list.next,
 405                                           struct vlan_entry, vlan_list);
 406                 } else {
 407                         next = list_entry(curr->vlan_list.next,
 408                                           struct vlan_entry, vlan_list);
 409                 }
 410         }
 411
 412         return next;
 413 }
 414
 415 /**
 416  * bond_dev_queue_xmit - Prepare skb for xmit.
 417  *
 418  * @bond: bond device that got this skb for tx.
 419  * @skb: hw accel VLAN tagged skb to transmit
 420  * @slave_dev: slave that is supposed to xmit this skbuff
 421  *
 422  * When the bond gets an skb to transmit that is
 423  * already hardware accelerated VLAN tagged, and it
 424  * needs to relay this skb to a slave that is not
 425  * hw accel capable, the skb needs to be "unaccelerated",
 426  * i.e. strip the hwaccel tag and re-insert it as part
 427  * of the payload.
 428  */
 429 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 430                         struct net_device *slave_dev)
 431 {
 432         unsigned short uninitialized_var(vlan_id);
 433
 434         /* Test vlan_list not vlgrp to catch and handle 802.1p tags */
 435         if (!list_empty(&bond->vlan_list) &&
 436             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
 437             vlan_get_tag(skb, &vlan_id) == 0) {
 438                 skb->dev = slave_dev;
 439                 skb = vlan_put_tag(skb, vlan_id);
 440                 if (!skb) {
 441                         /* vlan_put_tag() frees the skb in case of error,
 442                          * so return success here so the calling functions
 443                          * won't attempt to free is again.
 444                          */
 445                         return 0;
 446                 }
 447         } else {
 448                 skb->dev = slave_dev;
 449         }
 450
 451         skb->priority = 1;
 452 #ifdef CONFIG_NET_POLL_CONTROLLER
 453         if (unlikely(bond->dev->priv_flags & IFF_IN_NETPOLL)) {
 454                 struct netpoll *np = bond->dev->npinfo->netpoll;
 455                 slave_dev->npinfo = bond->dev->npinfo;
 456                 slave_dev->priv_flags |= IFF_IN_NETPOLL;
 457                 netpoll_send_skb_on_dev(np, skb, slave_dev);
 458                 slave_dev->priv_flags &= ~IFF_IN_NETPOLL;
 459         } else
 460 #endif
 461                 dev_queue_xmit(skb);
 462
 463         return 0;
 464 }
 465
 466 /*
 467  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 468  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 469  * lock because:
 470  * a. This operation is performed in IOCTL context,
 471  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 472  * c. Holding a lock with BH disabled while directly calling a base driver
 473  *    entry point is generally a BAD idea.
 474  *
 475  * The design of synchronization/protection for this operation in the 8021q
 476  * module is good for one or more VLAN devices over a single physical device
 477  * and cannot be extended for a teaming solution like bonding, so there is a
 478  * potential race condition here where a net device from the vlan group might
 479  * be referenced (either by a base driver or the 8021q code) while it is being
 480  * removed from the system. However, it turns out we're not making matters
 481  * worse, and if it works for regular VLAN usage it will work here too.
 482 */
 483
 484 /**
 485  * bond_vlan_rx_register - Propagates registration to slaves
 486  * @bond_dev: bonding net device that got called
 487  * @grp: vlan group being registered
 488  */
 489 static void bond_vlan_rx_register(struct net_device *bond_dev,
 490                                   struct vlan_group *grp)
 491 {
 492         struct bonding *bond = netdev_priv(bond_dev);
 493         struct slave *slave;
 494         int i;
 495
 496         write_lock_bh(&bond->lock);
 497         bond->vlgrp = grp;
 498         write_unlock_bh(&bond->lock);
 499
 500         bond_for_each_slave(bond, slave, i) {
 501                 struct net_device *slave_dev = slave->dev;
 502                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 503
 504                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 505                     slave_ops->ndo_vlan_rx_register) {
 506                         slave_ops->ndo_vlan_rx_register(slave_dev, grp);
 507                 }
 508         }
 509 }
 510
 511 /**
 512  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 513  * @bond_dev: bonding net device that got called
 514  * @vid: vlan id being added
 515  */
 516 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 517 {
 518         struct bonding *bond = netdev_priv(bond_dev);
 519         struct slave *slave;
 520         int i, res;
 521
 522         bond_for_each_slave(bond, slave, i) {
 523                 struct net_device *slave_dev = slave->dev;
 524                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 525
 526                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 527                     slave_ops->ndo_vlan_rx_add_vid) {
 528                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
 529                 }
 530         }
 531
 532         res = bond_add_vlan(bond, vid);
 533         if (res) {
 534                 pr_err("%s: Error: Failed to add vlan id %d\n",
 535                        bond_dev->name, vid);
 536         }
 537 }
 538
 539 /**
 540  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 541  * @bond_dev: bonding net device that got called
 542  * @vid: vlan id being removed
 543  */
 544 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 545 {
 546         struct bonding *bond = netdev_priv(bond_dev);
 547         struct slave *slave;
 548         struct net_device *vlan_dev;
 549         int i, res;
 550
 551         bond_for_each_slave(bond, slave, i) {
 552                 struct net_device *slave_dev = slave->dev;
 553                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 554
 555                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 556                     slave_ops->ndo_vlan_rx_kill_vid) {
 557                         /* Save and then restore vlan_dev in the grp array,
 558                          * since the slave's driver might clear it.
 559                          */
 560                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
 561                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
 562                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
 563                 }
 564         }
 565
 566         res = bond_del_vlan(bond, vid);
 567         if (res) {
 568                 pr_err("%s: Error: Failed to remove vlan id %d\n",
 569                        bond_dev->name, vid);
 570         }
 571 }
 572
 573 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 574 {
 575         struct vlan_entry *vlan;
 576         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 577
 578         if (!bond->vlgrp)
 579                 return;
 580
 581         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 582             slave_ops->ndo_vlan_rx_register)
 583                 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
 584
 585         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 586             !(slave_ops->ndo_vlan_rx_add_vid))
 587                 return;
 588
 589         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
 590                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 591 }
 592
 593 static void bond_del_vlans_from_slave(struct bonding *bond,
 594                                       struct net_device *slave_dev)
 595 {
 596         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 597         struct vlan_entry *vlan;
 598         struct net_device *vlan_dev;
 599
 600         if (!bond->vlgrp)
 601                 return;
 602
 603         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 604             !(slave_ops->ndo_vlan_rx_kill_vid))
 605                 goto unreg;
 606
 607         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 608                 if (!vlan->vlan_id)
 609                         continue;
 610                 /* Save and then restore vlan_dev in the grp array,
 611                  * since the slave's driver might clear it.
 612                  */
 613                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
 614                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 615                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
 616         }
 617
 618 unreg:
 619         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 620             slave_ops->ndo_vlan_rx_register)
 621                 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
 622 }
 623
 624 /*------------------------------- Link status -------------------------------*/
 625
 626 /*
 627  * Set the carrier state for the master according to the state of its
 628  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 629  * do special 802.3ad magic.
 630  *
 631  * Returns zero if carrier state does not change, nonzero if it does.
 632  */
 633 static int bond_set_carrier(struct bonding *bond)
 634 {
 635         struct slave *slave;
 636         int i;
 637
 638         if (bond->slave_cnt == 0)
 639                 goto down;
 640
 641         if (bond->params.mode == BOND_MODE_8023AD)
 642                 return bond_3ad_set_carrier(bond);
 643
 644         bond_for_each_slave(bond, slave, i) {
 645                 if (slave->link == BOND_LINK_UP) {
 646                         if (!netif_carrier_ok(bond->dev)) {
 647                                 netif_carrier_on(bond->dev);
 648                                 return 1;
 649                         }
 650                         return 0;
 651                 }
 652         }
 653
 654 down:
 655         if (netif_carrier_ok(bond->dev)) {
 656                 netif_carrier_off(bond->dev);
 657                 return 1;
 658         }
 659         return 0;
 660 }
 661
 662 /*
 663  * Get link speed and duplex from the slave's base driver
 664  * using ethtool. If for some reason the call fails or the
 665  * values are invalid, fake speed and duplex to 100/Full
 666  * and return error.
 667  */
 668 static int bond_update_speed_duplex(struct slave *slave)
 669 {
 670         struct net_device *slave_dev = slave->dev;
 671         struct ethtool_cmd etool;
 672         int res;
 673
 674         /* Fake speed and duplex */
 675         slave->speed = SPEED_100;
 676         slave->duplex = DUPLEX_FULL;
 677
 678         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
 679                 return -1;
 680
 681         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 682         if (res < 0)
 683                 return -1;
 684
 685         switch (etool.speed) {
 686         case SPEED_10:
 687         case SPEED_100:
 688         case SPEED_1000:
 689         case SPEED_10000:
 690                 break;
 691         default:
 692                 return -1;
 693         }
 694
 695         switch (etool.duplex) {
 696         case DUPLEX_FULL:
 697         case DUPLEX_HALF:
 698                 break;
 699         default:
 700                 return -1;
 701         }
 702
 703         slave->speed = etool.speed;
 704         slave->duplex = etool.duplex;
 705
 706         return 0;
 707 }
 708
 709 /*
 710  * if <dev> supports MII link status reporting, check its link status.
 711  *
 712  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 713  * depending upon the setting of the use_carrier parameter.
 714  *
 715  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 716  * can't tell and just pretend it is), or 0, meaning that the link is
 717  * down.
 718  *
 719  * If reporting is non-zero, instead of faking link up, return -1 if
 720  * both ETHTOOL and MII ioctls fail (meaning the device does not
 721  * support them).  If use_carrier is set, return whatever it says.
 722  * It'd be nice if there was a good way to tell if a driver supports
 723  * netif_carrier, but there really isn't.
 724  */
 725 static int bond_check_dev_link(struct bonding *bond,
 726                                struct net_device *slave_dev, int reporting)
 727 {
 728         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 729         int (*ioctl)(struct net_device *, struct ifreq *, int);
 730         struct ifreq ifr;
 731         struct mii_ioctl_data *mii;
 732
 733         if (!reporting && !netif_running(slave_dev))
 734                 return 0;
 735
 736         if (bond->params.use_carrier)
 737                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 738
 739         /* Try to get link status using Ethtool first. */
 740         if (slave_dev->ethtool_ops) {
 741                 if (slave_dev->ethtool_ops->get_link) {
 742                         u32 link;
 743
 744                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 745
 746                         return link ? BMSR_LSTATUS : 0;
 747                 }
 748         }
 749
 750         /* Ethtool can't be used, fallback to MII ioctls. */
 751         ioctl = slave_ops->ndo_do_ioctl;
 752         if (ioctl) {
 753                 /* TODO: set pointer to correct ioctl on a per team member */
 754                 /*       bases to make this more efficient. that is, once  */
 755                 /*       we determine the correct ioctl, we will always    */
 756                 /*       call it and not the others for that team          */
 757                 /*       member.                                           */
 758
 759                 /*
 760                  * We cannot assume that SIOCGMIIPHY will also read a
 761                  * register; not all network drivers (e.g., e100)
 762                  * support that.
 763                  */
 764
 765                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 766                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 767                 mii = if_mii(&ifr);
 768                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 769                         mii->reg_num = MII_BMSR;
 770                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 771                                 return mii->val_out & BMSR_LSTATUS;
 772                 }
 773         }
 774
 775         /*
 776          * If reporting, report that either there's no dev->do_ioctl,
 777          * or both SIOCGMIIREG and get_link failed (meaning that we
 778          * cannot report link status).  If not reporting, pretend
 779          * we're ok.
 780          */
 781         return reporting ? -1 : BMSR_LSTATUS;
 782 }
 783
 784 /*----------------------------- Multicast list ------------------------------*/
 785
 786 /*
 787  * Push the promiscuity flag down to appropriate slaves
 788  */
 789 static int bond_set_promiscuity(struct bonding *bond, int inc)
 790 {
 791         int err = 0;
 792         if (USES_PRIMARY(bond->params.mode)) {
 793                 /* write lock already acquired */
 794                 if (bond->curr_active_slave) {
 795                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 796                                                   inc);
 797                 }
 798         } else {
 799                 struct slave *slave;
 800                 int i;
 801                 bond_for_each_slave(bond, slave, i) {
 802                         err = dev_set_promiscuity(slave->dev, inc);
 803                         if (err)
 804                                 return err;
 805                 }
 806         }
 807         return err;
 808 }
 809
 810 /*
 811  * Push the allmulti flag down to all slaves
 812  */
 813 static int bond_set_allmulti(struct bonding *bond, int inc)
 814 {
 815         int err = 0;
 816         if (USES_PRIMARY(bond->params.mode)) {
 817                 /* write lock already acquired */
 818                 if (bond->curr_active_slave) {
 819                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 820                                                inc);
 821                 }
 822         } else {
 823                 struct slave *slave;
 824                 int i;
 825                 bond_for_each_slave(bond, slave, i) {
 826                         err = dev_set_allmulti(slave->dev, inc);
 827                         if (err)
 828                                 return err;
 829                 }
 830         }
 831         return err;
 832 }
 833
 834 /*
 835  * Add a Multicast address to slaves
 836  * according to mode
 837  */
 838 static void bond_mc_add(struct bonding *bond, void *addr)
 839 {
 840         if (USES_PRIMARY(bond->params.mode)) {
 841                 /* write lock already acquired */
 842                 if (bond->curr_active_slave)
 843                         dev_mc_add(bond->curr_active_slave->dev, addr);
 844         } else {
 845                 struct slave *slave;
 846                 int i;
 847
 848                 bond_for_each_slave(bond, slave, i)
 849                         dev_mc_add(slave->dev, addr);
 850         }
 851 }
 852
 853 /*
 854  * Remove a multicast address from slave
 855  * according to mode
 856  */
 857 static void bond_mc_del(struct bonding *bond, void *addr)
 858 {
 859         if (USES_PRIMARY(bond->params.mode)) {
 860                 /* write lock already acquired */
 861                 if (bond->curr_active_slave)
 862                         dev_mc_del(bond->curr_active_slave->dev, addr);
 863         } else {
 864                 struct slave *slave;
 865                 int i;
 866                 bond_for_each_slave(bond, slave, i) {
 867                         dev_mc_del(slave->dev, addr);
 868                 }
 869         }
 870 }
 871
 872
 873 static void __bond_resend_igmp_join_requests(struct net_device *dev)
 874 {
 875         struct in_device *in_dev;
 876         struct ip_mc_list *im;
 877
 878         rcu_read_lock();
 879         in_dev = __in_dev_get_rcu(dev);
 880         if (in_dev) {
 881                 for (im = in_dev->mc_list; im; im = im->next)
 882                         ip_mc_rejoin_group(im);
 883         }
 884
 885         rcu_read_unlock();
 886 }
 887
 888 /*
 889  * Retrieve the list of registered multicast addresses for the bonding
 890  * device and retransmit an IGMP JOIN request to the current active
 891  * slave.
 892  */
 893 static void bond_resend_igmp_join_requests(struct bonding *bond)
 894 {
 895         struct net_device *vlan_dev;
 896         struct vlan_entry *vlan;
 897
 898         read_lock(&bond->lock);
 899
 900         /* rejoin all groups on bond device */
 901         __bond_resend_igmp_join_requests(bond->dev);
 902
 903         /* rejoin all groups on vlan devices */
 904         if (bond->vlgrp) {
 905                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 906                         vlan_dev = vlan_group_get_device(bond->vlgrp,
 907                                                          vlan->vlan_id);
 908                         if (vlan_dev)
 909                                 __bond_resend_igmp_join_requests(vlan_dev);
 910                 }
 911         }
 912
 913         if (--bond->igmp_retrans > 0)
 914                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 915
 916         read_unlock(&bond->lock);
 917 }
 918
 919 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 920 {
 921         struct bonding *bond = container_of(work, struct bonding,
 922                                                         mcast_work.work);
 923         bond_resend_igmp_join_requests(bond);
 924 }
 925
 926 /*
 927  * flush all members of flush->mc_list from device dev->mc_list
 928  */
 929 static void bond_mc_list_flush(struct net_device *bond_dev,
 930                                struct net_device *slave_dev)
 931 {
 932         struct bonding *bond = netdev_priv(bond_dev);
 933         struct netdev_hw_addr *ha;
 934
 935         netdev_for_each_mc_addr(ha, bond_dev)
 936                 dev_mc_del(slave_dev, ha->addr);
 937
 938         if (bond->params.mode == BOND_MODE_8023AD) {
 939                 /* del lacpdu mc addr from mc list */
 940                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 941
 942                 dev_mc_del(slave_dev, lacpdu_multicast);
 943         }
 944 }
 945
 946 /*--------------------------- Active slave change ---------------------------*/
 947
 948 /*
 949  * Update the mc list and multicast-related flags for the new and
 950  * old active slaves (if any) according to the multicast mode, and
 951  * promiscuous flags unconditionally.
 952  */
 953 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
 954                          struct slave *old_active)
 955 {
 956         struct netdev_hw_addr *ha;
 957
 958         if (!USES_PRIMARY(bond->params.mode))
 959                 /* nothing to do -  mc list is already up-to-date on
 960                  * all slaves
 961                  */
 962                 return;
 963
 964         if (old_active) {
 965                 if (bond->dev->flags & IFF_PROMISC)
 966                         dev_set_promiscuity(old_active->dev, -1);
 967
 968                 if (bond->dev->flags & IFF_ALLMULTI)
 969                         dev_set_allmulti(old_active->dev, -1);
 970
 971                 netdev_for_each_mc_addr(ha, bond->dev)
 972                         dev_mc_del(old_active->dev, ha->addr);
 973         }
 974
 975         if (new_active) {
 976                 /* FIXME: Signal errors upstream. */
 977                 if (bond->dev->flags & IFF_PROMISC)
 978                         dev_set_promiscuity(new_active->dev, 1);
 979
 980                 if (bond->dev->flags & IFF_ALLMULTI)
 981                         dev_set_allmulti(new_active->dev, 1);
 982
 983                 netdev_for_each_mc_addr(ha, bond->dev)
 984                         dev_mc_add(new_active->dev, ha->addr);
 985         }
 986 }
 987
 988 /*
 989  * bond_do_fail_over_mac
 990  *
 991  * Perform special MAC address swapping for fail_over_mac settings
 992  *
 993  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 994  */
 995 static void bond_do_fail_over_mac(struct bonding *bond,
 996                                   struct slave *new_active,
 997                                   struct slave *old_active)
 998         __releases(&bond->curr_slave_lock)
 999         __releases(&bond->lock)
1000         __acquires(&bond->lock)
1001         __acquires(&bond->curr_slave_lock)
1002 {
1003         u8 tmp_mac[ETH_ALEN];
1004         struct sockaddr saddr;
1005         int rv;
1006
1007         switch (bond->params.fail_over_mac) {
1008         case BOND_FOM_ACTIVE:
1009                 if (new_active)
1010                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
1011                                new_active->dev->addr_len);
1012                 break;
1013         case BOND_FOM_FOLLOW:
1014                 /*
1015                  * if new_active && old_active, swap them
1016                  * if just old_active, do nothing (going to no active slave)
1017                  * if just new_active, set new_active to bond's MAC
1018                  */
1019                 if (!new_active)
1020                         return;
1021
1022                 write_unlock_bh(&bond->curr_slave_lock);
1023                 read_unlock(&bond->lock);
1024
1025                 if (old_active) {
1026                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1027                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
1028                                ETH_ALEN);
1029                         saddr.sa_family = new_active->dev->type;
1030                 } else {
1031                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1032                         saddr.sa_family = bond->dev->type;
1033                 }
1034
1035                 rv = dev_set_mac_address(new_active->dev, &saddr);
1036                 if (rv) {
1037                         pr_err("%s: Error %d setting MAC of slave %s\n",
1038                                bond->dev->name, -rv, new_active->dev->name);
1039                         goto out;
1040                 }
1041
1042                 if (!old_active)
1043                         goto out;
1044
1045                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1046                 saddr.sa_family = old_active->dev->type;
1047
1048                 rv = dev_set_mac_address(old_active->dev, &saddr);
1049                 if (rv)
1050                         pr_err("%s: Error %d setting MAC of slave %s\n",
1051                                bond->dev->name, -rv, new_active->dev->name);
1052 out:
1053                 read_lock(&bond->lock);
1054                 write_lock_bh(&bond->curr_slave_lock);
1055                 break;
1056         default:
1057                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
1058                        bond->dev->name, bond->params.fail_over_mac);
1059                 break;
1060         }
1061
1062 }
1063
1064 static bool bond_should_change_active(struct bonding *bond)
1065 {
1066         struct slave *prim = bond->primary_slave;
1067         struct slave *curr = bond->curr_active_slave;
1068
1069         if (!prim || !curr || curr->link != BOND_LINK_UP)
1070                 return true;
1071         if (bond->force_primary) {
1072                 bond->force_primary = false;
1073                 return true;
1074         }
1075         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
1076             (prim->speed < curr->speed ||
1077              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
1078                 return false;
1079         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
1080                 return false;
1081         return true;
1082 }
1083
1084 /**
1085  * find_best_interface - select the best available slave to be the active one
1086  * @bond: our bonding struct
1087  *
1088  * Warning: Caller must hold curr_slave_lock for writing.
1089  */
1090 static struct slave *bond_find_best_slave(struct bonding *bond)
1091 {
1092         struct slave *new_active, *old_active;
1093         struct slave *bestslave = NULL;
1094         int mintime = bond->params.updelay;
1095         int i;
1096
1097         new_active = bond->curr_active_slave;
1098
1099         if (!new_active) { /* there were no active slaves left */
1100                 if (bond->slave_cnt > 0)   /* found one slave */
1101                         new_active = bond->first_slave;
1102                 else
1103                         return NULL; /* still no slave, return NULL */
1104         }
1105
1106         if ((bond->primary_slave) &&
1107             bond->primary_slave->link == BOND_LINK_UP &&
1108             bond_should_change_active(bond)) {
1109                 new_active = bond->primary_slave;
1110         }
1111
1112         /* remember where to stop iterating over the slaves */
1113         old_active = new_active;
1114
1115         bond_for_each_slave_from(bond, new_active, i, old_active) {
1116                 if (new_active->link == BOND_LINK_UP) {
1117                         return new_active;
1118                 } else if (new_active->link == BOND_LINK_BACK &&
1119                            IS_UP(new_active->dev)) {
1120                         /* link up, but waiting for stabilization */
1121                         if (new_active->delay < mintime) {
1122                                 mintime = new_active->delay;
1123                                 bestslave = new_active;
1124                         }
1125                 }
1126         }
1127
1128         return bestslave;
1129 }
1130
1131 /**
1132  * change_active_interface - change the active slave into the specified one
1133  * @bond: our bonding struct
1134  * @new: the new slave to make the active one
1135  *
1136  * Set the new slave to the bond's settings and unset them on the old
1137  * curr_active_slave.
1138  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1139  *
1140  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1141  * because it is apparently the best available slave we have, even though its
1142  * updelay hasn't timed out yet.
1143  *
1144  * If new_active is not NULL, caller must hold bond->lock for read and
1145  * curr_slave_lock for write_bh.
1146  */
1147 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1148 {
1149         struct slave *old_active = bond->curr_active_slave;
1150
1151         if (old_active == new_active)
1152                 return;
1153
1154         if (new_active) {
1155                 new_active->jiffies = jiffies;
1156
1157                 if (new_active->link == BOND_LINK_BACK) {
1158                         if (USES_PRIMARY(bond->params.mode)) {
1159                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1160                                         bond->dev->name, new_active->dev->name,
1161                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1162                         }
1163
1164                         new_active->delay = 0;
1165                         new_active->link = BOND_LINK_UP;
1166
1167                         if (bond->params.mode == BOND_MODE_8023AD)
1168                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1169
1170                         if (bond_is_lb(bond))
1171                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1172                 } else {
1173                         if (USES_PRIMARY(bond->params.mode)) {
1174                                 pr_info("%s: making interface %s the new active one.\n",
1175                                         bond->dev->name, new_active->dev->name);
1176                         }
1177                 }
1178         }
1179
1180         if (USES_PRIMARY(bond->params.mode))
1181                 bond_mc_swap(bond, new_active, old_active);
1182
1183         if (bond_is_lb(bond)) {
1184                 bond_alb_handle_active_change(bond, new_active);
1185                 if (old_active)
1186                         bond_set_slave_inactive_flags(old_active);
1187                 if (new_active)
1188                         bond_set_slave_active_flags(new_active);
1189         } else {
1190                 bond->curr_active_slave = new_active;
1191         }
1192
1193         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1194                 if (old_active)
1195                         bond_set_slave_inactive_flags(old_active);
1196
1197                 if (new_active) {
1198                         bond_set_slave_active_flags(new_active);
1199
1200                         if (bond->params.fail_over_mac)
1201                                 bond_do_fail_over_mac(bond, new_active,
1202                                                       old_active);
1203
1204                         bond->send_grat_arp = bond->params.num_grat_arp;
1205                         bond_send_gratuitous_arp(bond);
1206
1207                         bond->send_unsol_na = bond->params.num_unsol_na;
1208                         bond_send_unsolicited_na(bond);
1209
1210                         write_unlock_bh(&bond->curr_slave_lock);
1211                         read_unlock(&bond->lock);
1212
1213                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1214
1215                         read_lock(&bond->lock);
1216                         write_lock_bh(&bond->curr_slave_lock);
1217                 }
1218         }
1219
1220         /* resend IGMP joins since active slave has changed or
1221          * all were sent on curr_active_slave */
1222         if ((USES_PRIMARY(bond->params.mode) && new_active) ||
1223             bond->params.mode == BOND_MODE_ROUNDROBIN) {
1224                 bond->igmp_retrans = bond->params.resend_igmp;
1225                 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1226         }
1227 }
1228
1229 /**
1230  * bond_select_active_slave - select a new active slave, if needed
1231  * @bond: our bonding struct
1232  *
1233  * This functions should be called when one of the following occurs:
1234  * - The old curr_active_slave has been released or lost its link.
1235  * - The primary_slave has got its link back.
1236  * - A slave has got its link back and there's no old curr_active_slave.
1237  *
1238  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1239  */
1240 void bond_select_active_slave(struct bonding *bond)
1241 {
1242         struct slave *best_slave;
1243         int rv;
1244
1245         best_slave = bond_find_best_slave(bond);
1246         if (best_slave != bond->curr_active_slave) {
1247                 bond_change_active_slave(bond, best_slave);
1248                 rv = bond_set_carrier(bond);
1249                 if (!rv)
1250                         return;
1251
1252                 if (netif_carrier_ok(bond->dev)) {
1253                         pr_info("%s: first active interface up!\n",
1254                                 bond->dev->name);
1255                 } else {
1256                         pr_info("%s: now running without any active interface !\n",
1257                                 bond->dev->name);
1258                 }
1259         }
1260 }
1261
1262 /*--------------------------- slave list handling ---------------------------*/
1263
1264 /*
1265  * This function attaches the slave to the end of list.
1266  *
1267  * bond->lock held for writing by caller.
1268  */
1269 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1270 {
1271         if (bond->first_slave == NULL) { /* attaching the first slave */
1272                 new_slave->next = new_slave;
1273                 new_slave->prev = new_slave;
1274                 bond->first_slave = new_slave;
1275         } else {
1276                 new_slave->next = bond->first_slave;
1277                 new_slave->prev = bond->first_slave->prev;
1278                 new_slave->next->prev = new_slave;
1279                 new_slave->prev->next = new_slave;
1280         }
1281
1282         bond->slave_cnt++;
1283 }
1284
1285 /*
1286  * This function detaches the slave from the list.
1287  * WARNING: no check is made to verify if the slave effectively
1288  * belongs to <bond>.
1289  * Nothing is freed on return, structures are just unchained.
1290  * If any slave pointer in bond was pointing to <slave>,
1291  * it should be changed by the calling function.
1292  *
1293  * bond->lock held for writing by caller.
1294  */
1295 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1296 {
1297         if (slave->next)
1298                 slave->next->prev = slave->prev;
1299
1300         if (slave->prev)
1301                 slave->prev->next = slave->next;
1302
1303         if (bond->first_slave == slave) { /* slave is the first slave */
1304                 if (bond->slave_cnt > 1) { /* there are more slave */
1305                         bond->first_slave = slave->next;
1306                 } else {
1307                         bond->first_slave = NULL; /* slave was the last one */
1308                 }
1309         }
1310
1311         slave->next = NULL;
1312         slave->prev = NULL;
1313         bond->slave_cnt--;
1314 }
1315
1316 #ifdef CONFIG_NET_POLL_CONTROLLER
1317 /*
1318  * You must hold read lock on bond->lock before calling this.
1319  */
1320 static bool slaves_support_netpoll(struct net_device *bond_dev)
1321 {
1322         struct bonding *bond = netdev_priv(bond_dev);
1323         struct slave *slave;
1324         int i = 0;
1325         bool ret = true;
1326
1327         bond_for_each_slave(bond, slave, i) {
1328                 if ((slave->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
1329                     !slave->dev->netdev_ops->ndo_poll_controller)
1330                         ret = false;
1331         }
1332         return i != 0 && ret;
1333 }
1334
1335 static void bond_poll_controller(struct net_device *bond_dev)
1336 {
1337         struct bonding *bond = netdev_priv(bond_dev);
1338         struct slave *slave;
1339         int i;
1340
1341         bond_for_each_slave(bond, slave, i) {
1342                 if (slave->dev && IS_UP(slave->dev))
1343                         netpoll_poll_dev(slave->dev);
1344         }
1345 }
1346
1347 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1348 {
1349         struct bonding *bond = netdev_priv(bond_dev);
1350         struct slave *slave;
1351         const struct net_device_ops *ops;
1352         int i;
1353
1354         read_lock(&bond->lock);
1355         bond_dev->npinfo = NULL;
1356         bond_for_each_slave(bond, slave, i) {
1357                 if (slave->dev) {
1358                         ops = slave->dev->netdev_ops;
1359                         if (ops->ndo_netpoll_cleanup)
1360                                 ops->ndo_netpoll_cleanup(slave->dev);
1361                         else
1362                                 slave->dev->npinfo = NULL;
1363                 }
1364         }
1365         read_unlock(&bond->lock);
1366 }
1367
1368 #else
1369
1370 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1371 {
1372 }
1373
1374 #endif
1375
1376 /*---------------------------------- IOCTL ----------------------------------*/
1377
1378 static int bond_sethwaddr(struct net_device *bond_dev,
1379                           struct net_device *slave_dev)
1380 {
1381         pr_debug("bond_dev=%p\n", bond_dev);
1382         pr_debug("slave_dev=%p\n", slave_dev);
1383         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1384         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1385         return 0;
1386 }
1387
1388 #define BOND_VLAN_FEATURES \
1389         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1390          NETIF_F_HW_VLAN_FILTER)
1391
1392 /*
1393  * Compute the common dev->feature set available to all slaves.  Some
1394  * feature bits are managed elsewhere, so preserve those feature bits
1395  * on the master device.
1396  */
1397 static int bond_compute_features(struct bonding *bond)
1398 {
1399         struct slave *slave;
1400         struct net_device *bond_dev = bond->dev;
1401         unsigned long features = bond_dev->features;
1402         unsigned long vlan_features = 0;
1403         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1404                                                 bond_dev->hard_header_len);
1405         int i;
1406
1407         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1408         features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1409
1410         if (!bond->first_slave)
1411                 goto done;
1412
1413         features &= ~NETIF_F_ONE_FOR_ALL;
1414
1415         vlan_features = bond->first_slave->dev->vlan_features;
1416         bond_for_each_slave(bond, slave, i) {
1417                 features = netdev_increment_features(features,
1418                                                      slave->dev->features,
1419                                                      NETIF_F_ONE_FOR_ALL);
1420                 vlan_features = netdev_increment_features(vlan_features,
1421                                                         slave->dev->vlan_features,
1422                                                         NETIF_F_ONE_FOR_ALL);
1423                 if (slave->dev->hard_header_len > max_hard_header_len)
1424                         max_hard_header_len = slave->dev->hard_header_len;
1425         }
1426
1427 done:
1428         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1429         bond_dev->features = netdev_fix_features(features, NULL);
1430         bond_dev->vlan_features = netdev_fix_features(vlan_features, NULL);
1431         bond_dev->hard_header_len = max_hard_header_len;
1432
1433         return 0;
1434 }
1435
1436 static void bond_setup_by_slave(struct net_device *bond_dev,
1437                                 struct net_device *slave_dev)
1438 {
1439         struct bonding *bond = netdev_priv(bond_dev);
1440
1441         bond_dev->header_ops        = slave_dev->header_ops;
1442
1443         bond_dev->type              = slave_dev->type;
1444         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1445         bond_dev->addr_len          = slave_dev->addr_len;
1446
1447         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1448                 slave_dev->addr_len);
1449         bond->setup_by_slave = 1;
1450 }
1451
1452 /* enslave device <slave> to bond device <master> */
1453 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1454 {
1455         struct bonding *bond = netdev_priv(bond_dev);
1456         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1457         struct slave *new_slave = NULL;
1458         struct netdev_hw_addr *ha;
1459         struct sockaddr addr;
1460         int link_reporting;
1461         int old_features = bond_dev->features;
1462         int res = 0;
1463
1464         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1465                 slave_ops->ndo_do_ioctl == NULL) {
1466                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1467                            bond_dev->name, slave_dev->name);
1468         }
1469
1470         /* bond must be initialized by bond_open() before enslaving */
1471         if (!(bond_dev->flags & IFF_UP)) {
1472                 pr_warning("%s: master_dev is not up in bond_enslave\n",
1473                            bond_dev->name);
1474         }
1475
1476         /* already enslaved */
1477         if (slave_dev->flags & IFF_SLAVE) {
1478                 pr_debug("Error, Device was already enslaved\n");
1479                 return -EBUSY;
1480         }
1481
1482         /* vlan challenged mutual exclusion */
1483         /* no need to lock since we're protected by rtnl_lock */
1484         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1485                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1486                 if (bond->vlgrp) {
1487                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1488                                bond_dev->name, slave_dev->name, bond_dev->name);
1489                         return -EPERM;
1490                 } else {
1491                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1492                                    bond_dev->name, slave_dev->name,
1493                                    slave_dev->name, bond_dev->name);
1494                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1495                 }
1496         } else {
1497                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1498                 if (bond->slave_cnt == 0) {
1499                         /* First slave, and it is not VLAN challenged,
1500                          * so remove the block of adding VLANs over the bond.
1501                          */
1502                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1503                 }
1504         }
1505
1506         /*
1507          * Old ifenslave binaries are no longer supported.  These can
1508          * be identified with moderate accuracy by the state of the slave:
1509          * the current ifenslave will set the interface down prior to
1510          * enslaving it; the old ifenslave will not.
1511          */
1512         if ((slave_dev->flags & IFF_UP)) {
1513                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1514                        slave_dev->name);
1515                 res = -EPERM;
1516                 goto err_undo_flags;
1517         }
1518
1519         /* set bonding device ether type by slave - bonding netdevices are
1520          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1521          * there is a need to override some of the type dependent attribs/funcs.
1522          *
1523          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1524          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1525          */
1526         if (bond->slave_cnt == 0) {
1527                 if (bond_dev->type != slave_dev->type) {
1528                         pr_debug("%s: change device type from %d to %d\n",
1529                                  bond_dev->name,
1530                                  bond_dev->type, slave_dev->type);
1531
1532                         res = netdev_bonding_change(bond_dev,
1533                                                     NETDEV_PRE_TYPE_CHANGE);
1534                         res = notifier_to_errno(res);
1535                         if (res) {
1536                                 pr_err("%s: refused to change device type\n",
1537                                        bond_dev->name);
1538                                 res = -EBUSY;
1539                                 goto err_undo_flags;
1540                         }
1541
1542                         /* Flush unicast and multicast addresses */
1543                         dev_uc_flush(bond_dev);
1544                         dev_mc_flush(bond_dev);
1545
1546                         if (slave_dev->type != ARPHRD_ETHER)
1547                                 bond_setup_by_slave(bond_dev, slave_dev);
1548                         else
1549                                 ether_setup(bond_dev);
1550
1551                         netdev_bonding_change(bond_dev,
1552                                               NETDEV_POST_TYPE_CHANGE);
1553                 }
1554         } else if (bond_dev->type != slave_dev->type) {
1555                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1556                        slave_dev->name,
1557                        slave_dev->type, bond_dev->type);
1558                 res = -EINVAL;
1559                 goto err_undo_flags;
1560         }
1561
1562         if (slave_ops->ndo_set_mac_address == NULL) {
1563                 if (bond->slave_cnt == 0) {
1564                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1565                                    bond_dev->name);
1566                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1567                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1568                         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",
1569                                bond_dev->name);
1570                         res = -EOPNOTSUPP;
1571                         goto err_undo_flags;
1572                 }
1573         }
1574
1575         /* If this is the first slave, then we need to set the master's hardware
1576          * address to be the same as the slave's. */
1577         if (bond->slave_cnt == 0)
1578                 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1579                        slave_dev->addr_len);
1580
1581
1582         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1583         if (!new_slave) {
1584                 res = -ENOMEM;
1585                 goto err_undo_flags;
1586         }
1587
1588         /*
1589          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1590          * is set via sysfs or module option if desired.
1591          */
1592         new_slave->queue_id = 0;
1593
1594         /* Save slave's original mtu and then set it to match the bond */
1595         new_slave->original_mtu = slave_dev->mtu;
1596         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1597         if (res) {
1598                 pr_debug("Error %d calling dev_set_mtu\n", res);
1599                 goto err_free;
1600         }
1601
1602         /*
1603          * Save slave's original ("permanent") mac address for modes
1604          * that need it, and for restoring it upon release, and then
1605          * set it to the master's address
1606          */
1607         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1608
1609         if (!bond->params.fail_over_mac) {
1610                 /*
1611                  * Set slave to master's mac address.  The application already
1612                  * set the master's mac address to that of the first slave
1613                  */
1614                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1615                 addr.sa_family = slave_dev->type;
1616                 res = dev_set_mac_address(slave_dev, &addr);
1617                 if (res) {
1618                         pr_debug("Error %d calling set_mac_address\n", res);
1619                         goto err_restore_mtu;
1620                 }
1621         }
1622
1623         res = netdev_set_master(slave_dev, bond_dev);
1624         if (res) {
1625                 pr_debug("Error %d calling netdev_set_master\n", res);
1626                 goto err_restore_mac;
1627         }
1628         /* open the slave since the application closed it */
1629         res = dev_open(slave_dev);
1630         if (res) {
1631                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1632                 goto err_unset_master;
1633         }
1634
1635         new_slave->dev = slave_dev;
1636         slave_dev->priv_flags |= IFF_BONDING;
1637
1638         if (bond_is_lb(bond)) {
1639                 /* bond_alb_init_slave() must be called before all other stages since
1640                  * it might fail and we do not want to have to undo everything
1641                  */
1642                 res = bond_alb_init_slave(bond, new_slave);
1643                 if (res)
1644                         goto err_close;
1645         }
1646
1647         /* If the mode USES_PRIMARY, then the new slave gets the
1648          * master's promisc (and mc) settings only if it becomes the
1649          * curr_active_slave, and that is taken care of later when calling
1650          * bond_change_active()
1651          */
1652         if (!USES_PRIMARY(bond->params.mode)) {
1653                 /* set promiscuity level to new slave */
1654                 if (bond_dev->flags & IFF_PROMISC) {
1655                         res = dev_set_promiscuity(slave_dev, 1);
1656                         if (res)
1657                                 goto err_close;
1658                 }
1659
1660                 /* set allmulti level to new slave */
1661                 if (bond_dev->flags & IFF_ALLMULTI) {
1662                         res = dev_set_allmulti(slave_dev, 1);
1663                         if (res)
1664                                 goto err_close;
1665                 }
1666
1667                 netif_addr_lock_bh(bond_dev);
1668                 /* upload master's mc_list to new slave */
1669                 netdev_for_each_mc_addr(ha, bond_dev)
1670                         dev_mc_add(slave_dev, ha->addr);
1671                 netif_addr_unlock_bh(bond_dev);
1672         }
1673
1674         if (bond->params.mode == BOND_MODE_8023AD) {
1675                 /* add lacpdu mc addr to mc list */
1676                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1677
1678                 dev_mc_add(slave_dev, lacpdu_multicast);
1679         }
1680
1681         bond_add_vlans_on_slave(bond, slave_dev);
1682
1683         write_lock_bh(&bond->lock);
1684
1685         bond_attach_slave(bond, new_slave);
1686
1687         new_slave->delay = 0;
1688         new_slave->link_failure_count = 0;
1689
1690         bond_compute_features(bond);
1691
1692         write_unlock_bh(&bond->lock);
1693
1694         read_lock(&bond->lock);
1695
1696         new_slave->last_arp_rx = jiffies;
1697
1698         if (bond->params.miimon && !bond->params.use_carrier) {
1699                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1700
1701                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1702                         /*
1703                          * miimon is set but a bonded network driver
1704                          * does not support ETHTOOL/MII and
1705                          * arp_interval is not set.  Note: if
1706                          * use_carrier is enabled, we will never go
1707                          * here (because netif_carrier is always
1708                          * supported); thus, we don't need to change
1709                          * the messages for netif_carrier.
1710                          */
1711                         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",
1712                                bond_dev->name, slave_dev->name);
1713                 } else if (link_reporting == -1) {
1714                         /* unable get link status using mii/ethtool */
1715                         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",
1716                                    bond_dev->name, slave_dev->name);
1717                 }
1718         }
1719
1720         /* check for initial state */
1721         if (!bond->params.miimon ||
1722             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1723                 if (bond->params.updelay) {
1724                         pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1725                         new_slave->link  = BOND_LINK_BACK;
1726                         new_slave->delay = bond->params.updelay;
1727                 } else {
1728                         pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1729                         new_slave->link  = BOND_LINK_UP;
1730                 }
1731                 new_slave->jiffies = jiffies;
1732         } else {
1733                 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1734                 new_slave->link  = BOND_LINK_DOWN;
1735         }
1736
1737         if (bond_update_speed_duplex(new_slave) &&
1738             (new_slave->link != BOND_LINK_DOWN)) {
1739                 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n",
1740                            bond_dev->name, new_slave->dev->name);
1741
1742                 if (bond->params.mode == BOND_MODE_8023AD) {
1743                         pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n",
1744                                    bond_dev->name);
1745                 }
1746         }
1747
1748         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1749                 /* if there is a primary slave, remember it */
1750                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1751                         bond->primary_slave = new_slave;
1752                         bond->force_primary = true;
1753                 }
1754         }
1755
1756         write_lock_bh(&bond->curr_slave_lock);
1757
1758         switch (bond->params.mode) {
1759         case BOND_MODE_ACTIVEBACKUP:
1760                 bond_set_slave_inactive_flags(new_slave);
1761                 bond_select_active_slave(bond);
1762                 break;
1763         case BOND_MODE_8023AD:
1764                 /* in 802.3ad mode, the internal mechanism
1765                  * will activate the slaves in the selected
1766                  * aggregator
1767                  */
1768                 bond_set_slave_inactive_flags(new_slave);
1769                 /* if this is the first slave */
1770                 if (bond->slave_cnt == 1) {
1771                         SLAVE_AD_INFO(new_slave).id = 1;
1772                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1773                          * can be called only after the mac address of the bond is set
1774                          */
1775                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1776                                             bond->params.lacp_fast);
1777                 } else {
1778                         SLAVE_AD_INFO(new_slave).id =
1779                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1780                 }
1781
1782                 bond_3ad_bind_slave(new_slave);
1783                 break;
1784         case BOND_MODE_TLB:
1785         case BOND_MODE_ALB:
1786                 new_slave->state = BOND_STATE_ACTIVE;
1787                 bond_set_slave_inactive_flags(new_slave);
1788                 bond_select_active_slave(bond);
1789                 break;
1790         default:
1791                 pr_debug("This slave is always active in trunk mode\n");
1792
1793                 /* always active in trunk mode */
1794                 new_slave->state = BOND_STATE_ACTIVE;
1795
1796                 /* In trunking mode there is little meaning to curr_active_slave
1797                  * anyway (it holds no special properties of the bond device),
1798                  * so we can change it without calling change_active_interface()
1799                  */
1800                 if (!bond->curr_active_slave)
1801                         bond->curr_active_slave = new_slave;
1802
1803                 break;
1804         } /* switch(bond_mode) */
1805
1806         write_unlock_bh(&bond->curr_slave_lock);
1807
1808         bond_set_carrier(bond);
1809
1810 #ifdef CONFIG_NET_POLL_CONTROLLER
1811         if (slaves_support_netpoll(bond_dev)) {
1812                 bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
1813                 if (bond_dev->npinfo)
1814                         slave_dev->npinfo = bond_dev->npinfo;
1815         } else if (!(bond_dev->priv_flags & IFF_DISABLE_NETPOLL)) {
1816                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1817                 pr_info("New slave device %s does not support netpoll\n",
1818                         slave_dev->name);
1819                 pr_info("Disabling netpoll support for %s\n", bond_dev->name);
1820         }
1821 #endif
1822         read_unlock(&bond->lock);
1823
1824         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1825         if (res)
1826                 goto err_close;
1827
1828         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1829                 bond_dev->name, slave_dev->name,
1830                 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1831                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1832
1833         /* enslave is successful */
1834         return 0;
1835
1836 /* Undo stages on error */
1837 err_close:
1838         dev_close(slave_dev);
1839
1840 err_unset_master:
1841         netdev_set_master(slave_dev, NULL);
1842
1843 err_restore_mac:
1844         if (!bond->params.fail_over_mac) {
1845                 /* XXX TODO - fom follow mode needs to change master's
1846                  * MAC if this slave's MAC is in use by the bond, or at
1847                  * least print a warning.
1848                  */
1849                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1850                 addr.sa_family = slave_dev->type;
1851                 dev_set_mac_address(slave_dev, &addr);
1852         }
1853
1854 err_restore_mtu:
1855         dev_set_mtu(slave_dev, new_slave->original_mtu);
1856
1857 err_free:
1858         kfree(new_slave);
1859
1860 err_undo_flags:
1861         bond_dev->features = old_features;
1862
1863         return res;
1864 }
1865
1866 /*
1867  * Try to release the slave device <slave> from the bond device <master>
1868  * It is legal to access curr_active_slave without a lock because all the function
1869  * is write-locked.
1870  *
1871  * The rules for slave state should be:
1872  *   for Active/Backup:
1873  *     Active stays on all backups go down
1874  *   for Bonded connections:
1875  *     The first up interface should be left on and all others downed.
1876  */
1877 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1878 {
1879         struct bonding *bond = netdev_priv(bond_dev);
1880         struct slave *slave, *oldcurrent;
1881         struct sockaddr addr;
1882
1883         /* slave is not a slave or master is not master of this slave */
1884         if (!(slave_dev->flags & IFF_SLAVE) ||
1885             (slave_dev->master != bond_dev)) {
1886                 pr_err("%s: Error: cannot release %s.\n",
1887                        bond_dev->name, slave_dev->name);
1888                 return -EINVAL;
1889         }
1890
1891         block_netpoll_tx();
1892         netdev_bonding_change(bond_dev, NETDEV_BONDING_DESLAVE);
1893         write_lock_bh(&bond->lock);
1894
1895         slave = bond_get_slave_by_dev(bond, slave_dev);
1896         if (!slave) {
1897                 /* not a slave of this bond */
1898                 pr_info("%s: %s not enslaved\n",
1899                         bond_dev->name, slave_dev->name);
1900                 write_unlock_bh(&bond->lock);
1901                 unblock_netpoll_tx();
1902                 return -EINVAL;
1903         }
1904
1905         if (!bond->params.fail_over_mac) {
1906                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1907                     bond->slave_cnt > 1)
1908                         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",
1909                                    bond_dev->name, slave_dev->name,
1910                                    slave->perm_hwaddr,
1911                                    bond_dev->name, slave_dev->name);
1912         }
1913
1914         /* Inform AD package of unbinding of slave. */
1915         if (bond->params.mode == BOND_MODE_8023AD) {
1916                 /* must be called before the slave is
1917                  * detached from the list
1918                  */
1919                 bond_3ad_unbind_slave(slave);
1920         }
1921
1922         pr_info("%s: releasing %s interface %s\n",
1923                 bond_dev->name,
1924                 (slave->state == BOND_STATE_ACTIVE) ? "active" : "backup",
1925                 slave_dev->name);
1926
1927         oldcurrent = bond->curr_active_slave;
1928
1929         bond->current_arp_slave = NULL;
1930
1931         /* release the slave from its bond */
1932         bond_detach_slave(bond, slave);
1933
1934         bond_compute_features(bond);
1935
1936         if (bond->primary_slave == slave)
1937                 bond->primary_slave = NULL;
1938
1939         if (oldcurrent == slave)
1940                 bond_change_active_slave(bond, NULL);
1941
1942         if (bond_is_lb(bond)) {
1943                 /* Must be called only after the slave has been
1944                  * detached from the list and the curr_active_slave
1945                  * has been cleared (if our_slave == old_current),
1946                  * but before a new active slave is selected.
1947                  */
1948                 write_unlock_bh(&bond->lock);
1949                 bond_alb_deinit_slave(bond, slave);
1950                 write_lock_bh(&bond->lock);
1951         }
1952
1953         if (oldcurrent == slave) {
1954                 /*
1955                  * Note that we hold RTNL over this sequence, so there
1956                  * is no concern that another slave add/remove event
1957                  * will interfere.
1958                  */
1959                 write_unlock_bh(&bond->lock);
1960                 read_lock(&bond->lock);
1961                 write_lock_bh(&bond->curr_slave_lock);
1962
1963                 bond_select_active_slave(bond);
1964
1965                 write_unlock_bh(&bond->curr_slave_lock);
1966                 read_unlock(&bond->lock);
1967                 write_lock_bh(&bond->lock);
1968         }
1969
1970         if (bond->slave_cnt == 0) {
1971                 bond_set_carrier(bond);
1972
1973                 /* if the last slave was removed, zero the mac address
1974                  * of the master so it will be set by the application
1975                  * to the mac address of the first slave
1976                  */
1977                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1978
1979                 if (!bond->vlgrp) {
1980                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1981                 } else {
1982                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1983                                    bond_dev->name, bond_dev->name);
1984                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1985                                    bond_dev->name);
1986                 }
1987         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1988                    !bond_has_challenged_slaves(bond)) {
1989                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1990                         bond_dev->name, slave_dev->name, bond_dev->name);
1991                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1992         }
1993
1994         write_unlock_bh(&bond->lock);
1995         unblock_netpoll_tx();
1996
1997         /* must do this from outside any spinlocks */
1998         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1999
2000         bond_del_vlans_from_slave(bond, slave_dev);
2001
2002         /* If the mode USES_PRIMARY, then we should only remove its
2003          * promisc and mc settings if it was the curr_active_slave, but that was
2004          * already taken care of above when we detached the slave
2005          */
2006         if (!USES_PRIMARY(bond->params.mode)) {
2007                 /* unset promiscuity level from slave */
2008                 if (bond_dev->flags & IFF_PROMISC)
2009                         dev_set_promiscuity(slave_dev, -1);
2010
2011                 /* unset allmulti level from slave */
2012                 if (bond_dev->flags & IFF_ALLMULTI)
2013                         dev_set_allmulti(slave_dev, -1);
2014
2015                 /* flush master's mc_list from slave */
2016                 netif_addr_lock_bh(bond_dev);
2017                 bond_mc_list_flush(bond_dev, slave_dev);
2018                 netif_addr_unlock_bh(bond_dev);
2019         }
2020
2021         netdev_set_master(slave_dev, NULL);
2022
2023 #ifdef CONFIG_NET_POLL_CONTROLLER
2024         read_lock_bh(&bond->lock);
2025
2026         if (slaves_support_netpoll(bond_dev))
2027                 bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
2028         read_unlock_bh(&bond->lock);
2029         if (slave_dev->netdev_ops->ndo_netpoll_cleanup)
2030                 slave_dev->netdev_ops->ndo_netpoll_cleanup(slave_dev);
2031         else
2032                 slave_dev->npinfo = NULL;
2033 #endif
2034
2035         /* close slave before restoring its mac address */
2036         dev_close(slave_dev);
2037
2038         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2039                 /* restore original ("permanent") mac address */
2040                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2041                 addr.sa_family = slave_dev->type;
2042                 dev_set_mac_address(slave_dev, &addr);
2043         }
2044
2045         dev_set_mtu(slave_dev, slave->original_mtu);
2046
2047         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2048                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
2049                                    IFF_SLAVE_NEEDARP);
2050
2051         kfree(slave);
2052
2053         return 0;  /* deletion OK */
2054 }
2055
2056 /*
2057 * First release a slave and than destroy the bond if no more slaves are left.
2058 * Must be under rtnl_lock when this function is called.
2059 */
2060 static int  bond_release_and_destroy(struct net_device *bond_dev,
2061                                      struct net_device *slave_dev)
2062 {
2063         struct bonding *bond = netdev_priv(bond_dev);
2064         int ret;
2065
2066         ret = bond_release(bond_dev, slave_dev);
2067         if ((ret == 0) && (bond->slave_cnt == 0)) {
2068                 pr_info("%s: destroying bond %s.\n",
2069                         bond_dev->name, bond_dev->name);
2070                 unregister_netdevice(bond_dev);
2071         }
2072         return ret;
2073 }
2074
2075 /*
2076  * This function releases all slaves.
2077  */
2078 static int bond_release_all(struct net_device *bond_dev)
2079 {
2080         struct bonding *bond = netdev_priv(bond_dev);
2081         struct slave *slave;
2082         struct net_device *slave_dev;
2083         struct sockaddr addr;
2084
2085         write_lock_bh(&bond->lock);
2086
2087         netif_carrier_off(bond_dev);
2088
2089         if (bond->slave_cnt == 0)
2090                 goto out;
2091
2092         bond->current_arp_slave = NULL;
2093         bond->primary_slave = NULL;
2094         bond_change_active_slave(bond, NULL);
2095
2096         while ((slave = bond->first_slave) != NULL) {
2097                 /* Inform AD package of unbinding of slave
2098                  * before slave is detached from the list.
2099                  */
2100                 if (bond->params.mode == BOND_MODE_8023AD)
2101                         bond_3ad_unbind_slave(slave);
2102
2103                 slave_dev = slave->dev;
2104                 bond_detach_slave(bond, slave);
2105
2106                 /* now that the slave is detached, unlock and perform
2107                  * all the undo steps that should not be called from
2108                  * within a lock.
2109                  */
2110                 write_unlock_bh(&bond->lock);
2111
2112                 if (bond_is_lb(bond)) {
2113                         /* must be called only after the slave
2114                          * has been detached from the list
2115                          */
2116                         bond_alb_deinit_slave(bond, slave);
2117                 }
2118
2119                 bond_compute_features(bond);
2120
2121                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2122                 bond_del_vlans_from_slave(bond, slave_dev);
2123
2124                 /* If the mode USES_PRIMARY, then we should only remove its
2125                  * promisc and mc settings if it was the curr_active_slave, but that was
2126                  * already taken care of above when we detached the slave
2127                  */
2128                 if (!USES_PRIMARY(bond->params.mode)) {
2129                         /* unset promiscuity level from slave */
2130                         if (bond_dev->flags & IFF_PROMISC)
2131                                 dev_set_promiscuity(slave_dev, -1);
2132
2133                         /* unset allmulti level from slave */
2134                         if (bond_dev->flags & IFF_ALLMULTI)
2135                                 dev_set_allmulti(slave_dev, -1);
2136
2137                         /* flush master's mc_list from slave */
2138                         netif_addr_lock_bh(bond_dev);
2139                         bond_mc_list_flush(bond_dev, slave_dev);
2140                         netif_addr_unlock_bh(bond_dev);
2141                 }
2142
2143                 netdev_set_master(slave_dev, NULL);
2144
2145                 /* close slave before restoring its mac address */
2146                 dev_close(slave_dev);
2147
2148                 if (!bond->params.fail_over_mac) {
2149                         /* restore original ("permanent") mac address*/
2150                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2151                         addr.sa_family = slave_dev->type;
2152                         dev_set_mac_address(slave_dev, &addr);
2153                 }
2154
2155                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2156                                            IFF_SLAVE_INACTIVE);
2157
2158                 kfree(slave);
2159
2160                 /* re-acquire the lock before getting the next slave */
2161                 write_lock_bh(&bond->lock);
2162         }
2163
2164         /* zero the mac address of the master so it will be
2165          * set by the application to the mac address of the
2166          * first slave
2167          */
2168         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2169
2170         if (!bond->vlgrp) {
2171                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2172         } else {
2173                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2174                            bond_dev->name, bond_dev->name);
2175                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2176                            bond_dev->name);
2177         }
2178
2179         pr_info("%s: released all slaves\n", bond_dev->name);
2180
2181 out:
2182         write_unlock_bh(&bond->lock);
2183         return 0;
2184 }
2185
2186 /*
2187  * This function changes the active slave to slave <slave_dev>.
2188  * It returns -EINVAL in the following cases.
2189  *  - <slave_dev> is not found in the list.
2190  *  - There is not active slave now.
2191  *  - <slave_dev> is already active.
2192  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2193  *  - <slave_dev> is not running.
2194  * In these cases, this function does nothing.
2195  * In the other cases, current_slave pointer is changed and 0 is returned.
2196  */
2197 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2198 {
2199         struct bonding *bond = netdev_priv(bond_dev);
2200         struct slave *old_active = NULL;
2201         struct slave *new_active = NULL;
2202         int res = 0;
2203
2204         if (!USES_PRIMARY(bond->params.mode))
2205                 return -EINVAL;
2206
2207         /* Verify that master_dev is indeed the master of slave_dev */
2208         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2209                 return -EINVAL;
2210
2211         read_lock(&bond->lock);
2212
2213         read_lock(&bond->curr_slave_lock);
2214         old_active = bond->curr_active_slave;
2215         read_unlock(&bond->curr_slave_lock);
2216
2217         new_active = bond_get_slave_by_dev(bond, slave_dev);
2218
2219         /*
2220          * Changing to the current active: do nothing; return success.
2221          */
2222         if (new_active && (new_active == old_active)) {
2223                 read_unlock(&bond->lock);
2224                 return 0;
2225         }
2226
2227         if ((new_active) &&
2228             (old_active) &&
2229             (new_active->link == BOND_LINK_UP) &&
2230             IS_UP(new_active->dev)) {
2231                 block_netpoll_tx();
2232                 write_lock_bh(&bond->curr_slave_lock);
2233                 bond_change_active_slave(bond, new_active);
2234                 write_unlock_bh(&bond->curr_slave_lock);
2235                 unblock_netpoll_tx();
2236         } else
2237                 res = -EINVAL;
2238
2239         read_unlock(&bond->lock);
2240
2241         return res;
2242 }
2243
2244 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2245 {
2246         struct bonding *bond = netdev_priv(bond_dev);
2247
2248         info->bond_mode = bond->params.mode;
2249         info->miimon = bond->params.miimon;
2250
2251         read_lock(&bond->lock);
2252         info->num_slaves = bond->slave_cnt;
2253         read_unlock(&bond->lock);
2254
2255         return 0;
2256 }
2257
2258 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2259 {
2260         struct bonding *bond = netdev_priv(bond_dev);
2261         struct slave *slave;
2262         int i, res = -ENODEV;
2263
2264         read_lock(&bond->lock);
2265
2266         bond_for_each_slave(bond, slave, i) {
2267                 if (i == (int)info->slave_id) {
2268                         res = 0;
2269                         strcpy(info->slave_name, slave->dev->name);
2270                         info->link = slave->link;
2271                         info->state = slave->state;
2272                         info->link_failure_count = slave->link_failure_count;
2273                         break;
2274                 }
2275         }
2276
2277         read_unlock(&bond->lock);
2278
2279         return res;
2280 }
2281
2282 /*-------------------------------- Monitoring -------------------------------*/
2283
2284
2285 static int bond_miimon_inspect(struct bonding *bond)
2286 {
2287         struct slave *slave;
2288         int i, link_state, commit = 0;
2289         bool ignore_updelay;
2290
2291         ignore_updelay = !bond->curr_active_slave ? true : false;
2292
2293         bond_for_each_slave(bond, slave, i) {
2294                 slave->new_link = BOND_LINK_NOCHANGE;
2295
2296                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2297
2298                 switch (slave->link) {
2299                 case BOND_LINK_UP:
2300                         if (link_state)
2301                                 continue;
2302
2303                         slave->link = BOND_LINK_FAIL;
2304                         slave->delay = bond->params.downdelay;
2305                         if (slave->delay) {
2306                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2307                                         bond->dev->name,
2308                                         (bond->params.mode ==
2309                                          BOND_MODE_ACTIVEBACKUP) ?
2310                                         ((slave->state == BOND_STATE_ACTIVE) ?
2311                                          "active " : "backup ") : "",
2312                                         slave->dev->name,
2313                                         bond->params.downdelay * bond->params.miimon);
2314                         }
2315                         /*FALLTHRU*/
2316                 case BOND_LINK_FAIL:
2317                         if (link_state) {
2318                                 /*
2319                                  * recovered before downdelay expired
2320                                  */
2321                                 slave->link = BOND_LINK_UP;
2322                                 slave->jiffies = jiffies;
2323                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2324                                         bond->dev->name,
2325                                         (bond->params.downdelay - slave->delay) *
2326                                         bond->params.miimon,
2327                                         slave->dev->name);
2328                                 continue;
2329                         }
2330
2331                         if (slave->delay <= 0) {
2332                                 slave->new_link = BOND_LINK_DOWN;
2333                                 commit++;
2334                                 continue;
2335                         }
2336
2337                         slave->delay--;
2338                         break;
2339
2340                 case BOND_LINK_DOWN:
2341                         if (!link_state)
2342                                 continue;
2343
2344                         slave->link = BOND_LINK_BACK;
2345                         slave->delay = bond->params.updelay;
2346
2347                         if (slave->delay) {
2348                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2349                                         bond->dev->name, slave->dev->name,
2350                                         ignore_updelay ? 0 :
2351                                         bond->params.updelay *
2352                                         bond->params.miimon);
2353                         }
2354                         /*FALLTHRU*/
2355                 case BOND_LINK_BACK:
2356                         if (!link_state) {
2357                                 slave->link = BOND_LINK_DOWN;
2358                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2359                                         bond->dev->name,
2360                                         (bond->params.updelay - slave->delay) *
2361                                         bond->params.miimon,
2362                                         slave->dev->name);
2363
2364                                 continue;
2365                         }
2366
2367                         if (ignore_updelay)
2368                                 slave->delay = 0;
2369
2370                         if (slave->delay <= 0) {
2371                                 slave->new_link = BOND_LINK_UP;
2372                                 commit++;
2373                                 ignore_updelay = false;
2374                                 continue;
2375                         }
2376
2377                         slave->delay--;
2378                         break;
2379                 }
2380         }
2381
2382         return commit;
2383 }
2384
2385 static void bond_miimon_commit(struct bonding *bond)
2386 {
2387         struct slave *slave;
2388         int i;
2389
2390         bond_for_each_slave(bond, slave, i) {
2391                 switch (slave->new_link) {
2392                 case BOND_LINK_NOCHANGE:
2393                         continue;
2394
2395                 case BOND_LINK_UP:
2396                         slave->link = BOND_LINK_UP;
2397                         slave->jiffies = jiffies;
2398
2399                         if (bond->params.mode == BOND_MODE_8023AD) {
2400                                 /* prevent it from being the active one */
2401                                 slave->state = BOND_STATE_BACKUP;
2402                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2403                                 /* make it immediately active */
2404                                 slave->state = BOND_STATE_ACTIVE;
2405                         } else if (slave != bond->primary_slave) {
2406                                 /* prevent it from being the active one */
2407                                 slave->state = BOND_STATE_BACKUP;
2408                         }
2409
2410                         bond_update_speed_duplex(slave);
2411
2412                         pr_info("%s: link status definitely up for interface %s, %d Mbps %s duplex.\n",
2413                                 bond->dev->name, slave->dev->name,
2414                                 slave->speed, slave->duplex ? "full" : "half");
2415
2416                         /* notify ad that the link status has changed */
2417                         if (bond->params.mode == BOND_MODE_8023AD)
2418                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2419
2420                         if (bond_is_lb(bond))
2421                                 bond_alb_handle_link_change(bond, slave,
2422                                                             BOND_LINK_UP);
2423
2424                         if (!bond->curr_active_slave ||
2425                             (slave == bond->primary_slave))
2426                                 goto do_failover;
2427
2428                         continue;
2429
2430                 case BOND_LINK_DOWN:
2431                         if (slave->link_failure_count < UINT_MAX)
2432                                 slave->link_failure_count++;
2433
2434                         slave->link = BOND_LINK_DOWN;
2435
2436                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2437                             bond->params.mode == BOND_MODE_8023AD)
2438                                 bond_set_slave_inactive_flags(slave);
2439
2440                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2441                                 bond->dev->name, slave->dev->name);
2442
2443                         if (bond->params.mode == BOND_MODE_8023AD)
2444                                 bond_3ad_handle_link_change(slave,
2445                                                             BOND_LINK_DOWN);
2446
2447                         if (bond_is_lb(bond))
2448                                 bond_alb_handle_link_change(bond, slave,
2449                                                             BOND_LINK_DOWN);
2450
2451                         if (slave == bond->curr_active_slave)
2452                                 goto do_failover;
2453
2454                         continue;
2455
2456                 default:
2457                         pr_err("%s: invalid new link %d on slave %s\n",
2458                                bond->dev->name, slave->new_link,
2459                                slave->dev->name);
2460                         slave->new_link = BOND_LINK_NOCHANGE;
2461
2462                         continue;
2463                 }
2464
2465 do_failover:
2466                 ASSERT_RTNL();
2467                 block_netpoll_tx();
2468                 write_lock_bh(&bond->curr_slave_lock);
2469                 bond_select_active_slave(bond);
2470                 write_unlock_bh(&bond->curr_slave_lock);
2471                 unblock_netpoll_tx();
2472         }
2473
2474         bond_set_carrier(bond);
2475 }
2476
2477 /*
2478  * bond_mii_monitor
2479  *
2480  * Really a wrapper that splits the mii monitor into two phases: an
2481  * inspection, then (if inspection indicates something needs to be done)
2482  * an acquisition of appropriate locks followed by a commit phase to
2483  * implement whatever link state changes are indicated.
2484  */
2485 void bond_mii_monitor(struct work_struct *work)
2486 {
2487         struct bonding *bond = container_of(work, struct bonding,
2488                                             mii_work.work);
2489
2490         read_lock(&bond->lock);
2491         if (bond->kill_timers)
2492                 goto out;
2493
2494         if (bond->slave_cnt == 0)
2495                 goto re_arm;
2496
2497         if (bond->send_grat_arp) {
2498                 read_lock(&bond->curr_slave_lock);
2499                 bond_send_gratuitous_arp(bond);
2500                 read_unlock(&bond->curr_slave_lock);
2501         }
2502
2503         if (bond->send_unsol_na) {
2504                 read_lock(&bond->curr_slave_lock);
2505                 bond_send_unsolicited_na(bond);
2506                 read_unlock(&bond->curr_slave_lock);
2507         }
2508
2509         if (bond_miimon_inspect(bond)) {
2510                 read_unlock(&bond->lock);
2511                 rtnl_lock();
2512                 read_lock(&bond->lock);
2513
2514                 bond_miimon_commit(bond);
2515
2516                 read_unlock(&bond->lock);
2517                 rtnl_unlock();  /* might sleep, hold no other locks */
2518                 read_lock(&bond->lock);
2519         }
2520
2521 re_arm:
2522         if (bond->params.miimon)
2523                 queue_delayed_work(bond->wq, &bond->mii_work,
2524                                    msecs_to_jiffies(bond->params.miimon));
2525 out:
2526         read_unlock(&bond->lock);
2527 }
2528
2529 static __be32 bond_glean_dev_ip(struct net_device *dev)
2530 {
2531         struct in_device *idev;
2532         struct in_ifaddr *ifa;
2533         __be32 addr = 0;
2534
2535         if (!dev)
2536                 return 0;
2537
2538         rcu_read_lock();
2539         idev = __in_dev_get_rcu(dev);
2540         if (!idev)
2541                 goto out;
2542
2543         ifa = idev->ifa_list;
2544         if (!ifa)
2545                 goto out;
2546
2547         addr = ifa->ifa_local;
2548 out:
2549         rcu_read_unlock();
2550         return addr;
2551 }
2552
2553 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2554 {
2555         struct vlan_entry *vlan;
2556
2557         if (ip == bond->master_ip)
2558                 return 1;
2559
2560         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2561                 if (ip == vlan->vlan_ip)
2562                         return 1;
2563         }
2564
2565         return 0;
2566 }
2567
2568 /*
2569  * We go to the (large) trouble of VLAN tagging ARP frames because
2570  * switches in VLAN mode (especially if ports are configured as
2571  * "native" to a VLAN) might not pass non-tagged frames.
2572  */
2573 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2574 {
2575         struct sk_buff *skb;
2576
2577         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2578                  slave_dev->name, dest_ip, src_ip, vlan_id);
2579
2580         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2581                          NULL, slave_dev->dev_addr, NULL);
2582
2583         if (!skb) {
2584                 pr_err("ARP packet allocation failed\n");
2585                 return;
2586         }
2587         if (vlan_id) {
2588                 skb = vlan_put_tag(skb, vlan_id);
2589                 if (!skb) {
2590                         pr_err("failed to insert VLAN tag\n");
2591                         return;
2592                 }
2593         }
2594         arp_xmit(skb);
2595 }
2596
2597
2598 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2599 {
2600         int i, vlan_id, rv;
2601         __be32 *targets = bond->params.arp_targets;
2602         struct vlan_entry *vlan;
2603         struct net_device *vlan_dev;
2604         struct flowi fl;
2605         struct rtable *rt;
2606
2607         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2608                 if (!targets[i])
2609                         break;
2610                 pr_debug("basa: target %x\n", targets[i]);
2611                 if (!bond->vlgrp) {
2612                         pr_debug("basa: empty vlan: arp_send\n");
2613                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2614                                       bond->master_ip, 0);
2615                         continue;
2616                 }
2617
2618                 /*
2619                  * If VLANs are configured, we do a route lookup to
2620                  * determine which VLAN interface would be used, so we
2621                  * can tag the ARP with the proper VLAN tag.
2622                  */
2623                 memset(&fl, 0, sizeof(fl));
2624                 fl.fl4_dst = targets[i];
2625                 fl.fl4_tos = RTO_ONLINK;
2626
2627                 rv = ip_route_output_key(dev_net(bond->dev), &rt, &fl);
2628                 if (rv) {
2629                         if (net_ratelimit()) {
2630                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2631                                            bond->dev->name, &fl.fl4_dst);
2632                         }
2633                         continue;
2634                 }
2635
2636                 /*
2637                  * This target is not on a VLAN
2638                  */
2639                 if (rt->dst.dev == bond->dev) {
2640                         ip_rt_put(rt);
2641                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2642                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2643                                       bond->master_ip, 0);
2644                         continue;
2645                 }
2646
2647                 vlan_id = 0;
2648                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2649                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2650                         if (vlan_dev == rt->dst.dev) {
2651                                 vlan_id = vlan->vlan_id;
2652                                 pr_debug("basa: vlan match on %s %d\n",
2653                                        vlan_dev->name, vlan_id);
2654                                 break;
2655                         }
2656                 }
2657
2658                 if (vlan_id) {
2659                         ip_rt_put(rt);
2660                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2661                                       vlan->vlan_ip, vlan_id);
2662                         continue;
2663                 }
2664
2665                 if (net_ratelimit()) {
2666                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2667                                    bond->dev->name, &fl.fl4_dst,
2668                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2669                 }
2670                 ip_rt_put(rt);
2671         }
2672 }
2673
2674 /*
2675  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2676  * for each VLAN above us.
2677  *
2678  * Caller must hold curr_slave_lock for read or better
2679  */
2680 static void bond_send_gratuitous_arp(struct bonding *bond)
2681 {
2682         struct slave *slave = bond->curr_active_slave;
2683         struct vlan_entry *vlan;
2684         struct net_device *vlan_dev;
2685
2686         pr_debug("bond_send_grat_arp: bond %s slave %s\n",
2687                  bond->dev->name, slave ? slave->dev->name : "NULL");
2688
2689         if (!slave || !bond->send_grat_arp ||
2690             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2691                 return;
2692
2693         bond->send_grat_arp--;
2694
2695         if (bond->master_ip) {
2696                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2697                                 bond->master_ip, 0);
2698         }
2699
2700         if (!bond->vlgrp)
2701                 return;
2702
2703         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2704                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2705                 if (vlan->vlan_ip) {
2706                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2707                                       vlan->vlan_ip, vlan->vlan_id);
2708                 }
2709         }
2710 }
2711
2712 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2713 {
2714         int i;
2715         __be32 *targets = bond->params.arp_targets;
2716
2717         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2718                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2719                          &sip, &tip, i, &targets[i],
2720                          bond_has_this_ip(bond, tip));
2721                 if (sip == targets[i]) {
2722                         if (bond_has_this_ip(bond, tip))
2723                                 slave->last_arp_rx = jiffies;
2724                         return;
2725                 }
2726         }
2727 }
2728
2729 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2730 {
2731         struct arphdr *arp;
2732         struct slave *slave;
2733         struct bonding *bond;
2734         unsigned char *arp_ptr;
2735         __be32 sip, tip;
2736
2737         if (dev->priv_flags & IFF_802_1Q_VLAN) {
2738                 /*
2739                  * When using VLANS and bonding, dev and oriv_dev may be
2740                  * incorrect if the physical interface supports VLAN
2741                  * acceleration.  With this change ARP validation now
2742                  * works for hosts only reachable on the VLAN interface.
2743                  */
2744                 dev = vlan_dev_real_dev(dev);
2745                 orig_dev = dev_get_by_index_rcu(dev_net(skb->dev),skb->skb_iif);
2746         }
2747
2748         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2749                 goto out;
2750
2751         bond = netdev_priv(dev);
2752         read_lock(&bond->lock);
2753
2754         pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2755                  bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2756                  orig_dev ? orig_dev->name : "NULL");
2757
2758         slave = bond_get_slave_by_dev(bond, orig_dev);
2759         if (!slave || !slave_do_arp_validate(bond, slave))
2760                 goto out_unlock;
2761
2762         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2763                 goto out_unlock;
2764
2765         arp = arp_hdr(skb);
2766         if (arp->ar_hln != dev->addr_len ||
2767             skb->pkt_type == PACKET_OTHERHOST ||
2768             skb->pkt_type == PACKET_LOOPBACK ||
2769             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2770             arp->ar_pro != htons(ETH_P_IP) ||
2771             arp->ar_pln != 4)
2772                 goto out_unlock;
2773
2774         arp_ptr = (unsigned char *)(arp + 1);
2775         arp_ptr += dev->addr_len;
2776         memcpy(&sip, arp_ptr, 4);
2777         arp_ptr += 4 + dev->addr_len;
2778         memcpy(&tip, arp_ptr, 4);
2779
2780         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2781                  bond->dev->name, slave->dev->name, slave->state,
2782                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2783                  &sip, &tip);
2784
2785         /*
2786          * Backup slaves won't see the ARP reply, but do come through
2787          * here for each ARP probe (so we swap the sip/tip to validate
2788          * the probe).  In a "redundant switch, common router" type of
2789          * configuration, the ARP probe will (hopefully) travel from
2790          * the active, through one switch, the router, then the other
2791          * switch before reaching the backup.
2792          */
2793         if (slave->state == BOND_STATE_ACTIVE)
2794                 bond_validate_arp(bond, slave, sip, tip);
2795         else
2796                 bond_validate_arp(bond, slave, tip, sip);
2797
2798 out_unlock:
2799         read_unlock(&bond->lock);
2800 out:
2801         dev_kfree_skb(skb);
2802         return NET_RX_SUCCESS;
2803 }
2804
2805 /*
2806  * this function is called regularly to monitor each slave's link
2807  * ensuring that traffic is being sent and received when arp monitoring
2808  * is used in load-balancing mode. if the adapter has been dormant, then an
2809  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2810  * arp monitoring in active backup mode.
2811  */
2812 void bond_loadbalance_arp_mon(struct work_struct *work)
2813 {
2814         struct bonding *bond = container_of(work, struct bonding,
2815                                             arp_work.work);
2816         struct slave *slave, *oldcurrent;
2817         int do_failover = 0;
2818         int delta_in_ticks;
2819         int i;
2820
2821         read_lock(&bond->lock);
2822
2823         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2824
2825         if (bond->kill_timers)
2826                 goto out;
2827
2828         if (bond->slave_cnt == 0)
2829                 goto re_arm;
2830
2831         read_lock(&bond->curr_slave_lock);
2832         oldcurrent = bond->curr_active_slave;
2833         read_unlock(&bond->curr_slave_lock);
2834
2835         /* see if any of the previous devices are up now (i.e. they have
2836          * xmt and rcv traffic). the curr_active_slave does not come into
2837          * the picture unless it is null. also, slave->jiffies is not needed
2838          * here because we send an arp on each slave and give a slave as
2839          * long as it needs to get the tx/rx within the delta.
2840          * TODO: what about up/down delay in arp mode? it wasn't here before
2841          *       so it can wait
2842          */
2843         bond_for_each_slave(bond, slave, i) {
2844                 unsigned long trans_start = dev_trans_start(slave->dev);
2845
2846                 if (slave->link != BOND_LINK_UP) {
2847                         if (time_in_range(jiffies,
2848                                 trans_start - delta_in_ticks,
2849                                 trans_start + delta_in_ticks) &&
2850                             time_in_range(jiffies,
2851                                 slave->dev->last_rx - delta_in_ticks,
2852                                 slave->dev->last_rx + delta_in_ticks)) {
2853
2854                                 slave->link  = BOND_LINK_UP;
2855                                 slave->state = BOND_STATE_ACTIVE;
2856
2857                                 /* primary_slave has no meaning in round-robin
2858                                  * mode. the window of a slave being up and
2859                                  * curr_active_slave being null after enslaving
2860                                  * is closed.
2861                                  */
2862                                 if (!oldcurrent) {
2863                                         pr_info("%s: link status definitely up for interface %s, ",
2864                                                 bond->dev->name,
2865                                                 slave->dev->name);
2866                                         do_failover = 1;
2867                                 } else {
2868                                         pr_info("%s: interface %s is now up\n",
2869                                                 bond->dev->name,
2870                                                 slave->dev->name);
2871                                 }
2872                         }
2873                 } else {
2874                         /* slave->link == BOND_LINK_UP */
2875
2876                         /* not all switches will respond to an arp request
2877                          * when the source ip is 0, so don't take the link down
2878                          * if we don't know our ip yet
2879                          */
2880                         if (!time_in_range(jiffies,
2881                                 trans_start - delta_in_ticks,
2882                                 trans_start + 2 * delta_in_ticks) ||
2883                             !time_in_range(jiffies,
2884                                 slave->dev->last_rx - delta_in_ticks,
2885                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2886
2887                                 slave->link  = BOND_LINK_DOWN;
2888                                 slave->state = BOND_STATE_BACKUP;
2889
2890                                 if (slave->link_failure_count < UINT_MAX)
2891                                         slave->link_failure_count++;
2892
2893                                 pr_info("%s: interface %s is now down.\n",
2894                                         bond->dev->name,
2895                                         slave->dev->name);
2896
2897                                 if (slave == oldcurrent)
2898                                         do_failover = 1;
2899                         }
2900                 }
2901
2902                 /* note: if switch is in round-robin mode, all links
2903                  * must tx arp to ensure all links rx an arp - otherwise
2904                  * links may oscillate or not come up at all; if switch is
2905                  * in something like xor mode, there is nothing we can
2906                  * do - all replies will be rx'ed on same link causing slaves
2907                  * to be unstable during low/no traffic periods
2908                  */
2909                 if (IS_UP(slave->dev))
2910                         bond_arp_send_all(bond, slave);
2911         }
2912
2913         if (do_failover) {
2914                 block_netpoll_tx();
2915                 write_lock_bh(&bond->curr_slave_lock);
2916
2917                 bond_select_active_slave(bond);
2918
2919                 write_unlock_bh(&bond->curr_slave_lock);
2920                 unblock_netpoll_tx();
2921         }
2922
2923 re_arm:
2924         if (bond->params.arp_interval)
2925                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2926 out:
2927         read_unlock(&bond->lock);
2928 }
2929
2930 /*
2931  * Called to inspect slaves for active-backup mode ARP monitor link state
2932  * changes.  Sets new_link in slaves to specify what action should take
2933  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2934  * to link states must be committed.
2935  *
2936  * Called with bond->lock held for read.
2937  */
2938 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2939 {
2940         struct slave *slave;
2941         int i, commit = 0;
2942         unsigned long trans_start;
2943
2944         bond_for_each_slave(bond, slave, i) {
2945                 slave->new_link = BOND_LINK_NOCHANGE;
2946
2947                 if (slave->link != BOND_LINK_UP) {
2948                         if (time_in_range(jiffies,
2949                                 slave_last_rx(bond, slave) - delta_in_ticks,
2950                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2951
2952                                 slave->new_link = BOND_LINK_UP;
2953                                 commit++;
2954                         }
2955
2956                         continue;
2957                 }
2958
2959                 /*
2960                  * Give slaves 2*delta after being enslaved or made
2961                  * active.  This avoids bouncing, as the last receive
2962                  * times need a full ARP monitor cycle to be updated.
2963                  */
2964                 if (time_in_range(jiffies,
2965                                   slave->jiffies - delta_in_ticks,
2966                                   slave->jiffies + 2 * delta_in_ticks))
2967                         continue;
2968
2969                 /*
2970                  * Backup slave is down if:
2971                  * - No current_arp_slave AND
2972                  * - more than 3*delta since last receive AND
2973                  * - the bond has an IP address
2974                  *
2975                  * Note: a non-null current_arp_slave indicates
2976                  * the curr_active_slave went down and we are
2977                  * searching for a new one; under this condition
2978                  * we only take the curr_active_slave down - this
2979                  * gives each slave a chance to tx/rx traffic
2980                  * before being taken out
2981                  */
2982                 if (slave->state == BOND_STATE_BACKUP &&
2983                     !bond->current_arp_slave &&
2984                     !time_in_range(jiffies,
2985                         slave_last_rx(bond, slave) - delta_in_ticks,
2986                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2987
2988                         slave->new_link = BOND_LINK_DOWN;
2989                         commit++;
2990                 }
2991
2992                 /*
2993                  * Active slave is down if:
2994                  * - more than 2*delta since transmitting OR
2995                  * - (more than 2*delta since receive AND
2996                  *    the bond has an IP address)
2997                  */
2998                 trans_start = dev_trans_start(slave->dev);
2999                 if ((slave->state == BOND_STATE_ACTIVE) &&
3000                     (!time_in_range(jiffies,
3001                         trans_start - delta_in_ticks,
3002                         trans_start + 2 * delta_in_ticks) ||
3003                      !time_in_range(jiffies,
3004                         slave_last_rx(bond, slave) - delta_in_ticks,
3005                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
3006
3007                         slave->new_link = BOND_LINK_DOWN;
3008                         commit++;
3009                 }
3010         }
3011
3012         return commit;
3013 }
3014
3015 /*
3016  * Called to commit link state changes noted by inspection step of
3017  * active-backup mode ARP monitor.
3018  *
3019  * Called with RTNL and bond->lock for read.
3020  */
3021 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3022 {
3023         struct slave *slave;
3024         int i;
3025         unsigned long trans_start;
3026
3027         bond_for_each_slave(bond, slave, i) {
3028                 switch (slave->new_link) {
3029                 case BOND_LINK_NOCHANGE:
3030                         continue;
3031
3032                 case BOND_LINK_UP:
3033                         trans_start = dev_trans_start(slave->dev);
3034                         if ((!bond->curr_active_slave &&
3035                              time_in_range(jiffies,
3036                                            trans_start - delta_in_ticks,
3037                                            trans_start + delta_in_ticks)) ||
3038                             bond->curr_active_slave != slave) {
3039                                 slave->link = BOND_LINK_UP;
3040                                 bond->current_arp_slave = NULL;
3041
3042                                 pr_info("%s: link status definitely up for interface %s.\n",
3043                                         bond->dev->name, slave->dev->name);
3044
3045                                 if (!bond->curr_active_slave ||
3046                                     (slave == bond->primary_slave))
3047                                         goto do_failover;
3048
3049                         }
3050
3051                         continue;
3052
3053                 case BOND_LINK_DOWN:
3054                         if (slave->link_failure_count < UINT_MAX)
3055                                 slave->link_failure_count++;
3056
3057                         slave->link = BOND_LINK_DOWN;
3058                         bond_set_slave_inactive_flags(slave);
3059
3060                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3061                                 bond->dev->name, slave->dev->name);
3062
3063                         if (slave == bond->curr_active_slave) {
3064                                 bond->current_arp_slave = NULL;
3065                                 goto do_failover;
3066                         }
3067
3068                         continue;
3069
3070                 default:
3071                         pr_err("%s: impossible: new_link %d on slave %s\n",
3072                                bond->dev->name, slave->new_link,
3073                                slave->dev->name);
3074                         continue;
3075                 }
3076
3077 do_failover:
3078                 ASSERT_RTNL();
3079                 block_netpoll_tx();
3080                 write_lock_bh(&bond->curr_slave_lock);
3081                 bond_select_active_slave(bond);
3082                 write_unlock_bh(&bond->curr_slave_lock);
3083                 unblock_netpoll_tx();
3084         }
3085
3086         bond_set_carrier(bond);
3087 }
3088
3089 /*
3090  * Send ARP probes for active-backup mode ARP monitor.
3091  *
3092  * Called with bond->lock held for read.
3093  */
3094 static void bond_ab_arp_probe(struct bonding *bond)
3095 {
3096         struct slave *slave;
3097         int i;
3098
3099         read_lock(&bond->curr_slave_lock);
3100
3101         if (bond->current_arp_slave && bond->curr_active_slave)
3102                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3103                         bond->current_arp_slave->dev->name,
3104                         bond->curr_active_slave->dev->name);
3105
3106         if (bond->curr_active_slave) {
3107                 bond_arp_send_all(bond, bond->curr_active_slave);
3108                 read_unlock(&bond->curr_slave_lock);
3109                 return;
3110         }
3111
3112         read_unlock(&bond->curr_slave_lock);
3113
3114         /* if we don't have a curr_active_slave, search for the next available
3115          * backup slave from the current_arp_slave and make it the candidate
3116          * for becoming the curr_active_slave
3117          */
3118
3119         if (!bond->current_arp_slave) {
3120                 bond->current_arp_slave = bond->first_slave;
3121                 if (!bond->current_arp_slave)
3122                         return;
3123         }
3124
3125         bond_set_slave_inactive_flags(bond->current_arp_slave);
3126
3127         /* search for next candidate */
3128         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3129                 if (IS_UP(slave->dev)) {
3130                         slave->link = BOND_LINK_BACK;
3131                         bond_set_slave_active_flags(slave);
3132                         bond_arp_send_all(bond, slave);
3133                         slave->jiffies = jiffies;
3134                         bond->current_arp_slave = slave;
3135                         break;
3136                 }
3137
3138                 /* if the link state is up at this point, we
3139                  * mark it down - this can happen if we have
3140                  * simultaneous link failures and
3141                  * reselect_active_interface doesn't make this
3142                  * one the current slave so it is still marked
3143                  * up when it is actually down
3144                  */
3145                 if (slave->link == BOND_LINK_UP) {
3146                         slave->link = BOND_LINK_DOWN;
3147                         if (slave->link_failure_count < UINT_MAX)
3148                                 slave->link_failure_count++;
3149
3150                         bond_set_slave_inactive_flags(slave);
3151
3152                         pr_info("%s: backup interface %s is now down.\n",
3153                                 bond->dev->name, slave->dev->name);
3154                 }
3155         }
3156 }
3157
3158 void bond_activebackup_arp_mon(struct work_struct *work)
3159 {
3160         struct bonding *bond = container_of(work, struct bonding,
3161                                             arp_work.work);
3162         int delta_in_ticks;
3163
3164         read_lock(&bond->lock);
3165
3166         if (bond->kill_timers)
3167                 goto out;
3168
3169         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3170
3171         if (bond->slave_cnt == 0)
3172                 goto re_arm;
3173
3174         if (bond->send_grat_arp) {
3175                 read_lock(&bond->curr_slave_lock);
3176                 bond_send_gratuitous_arp(bond);
3177                 read_unlock(&bond->curr_slave_lock);
3178         }
3179
3180         if (bond->send_unsol_na) {
3181                 read_lock(&bond->curr_slave_lock);
3182                 bond_send_unsolicited_na(bond);
3183                 read_unlock(&bond->curr_slave_lock);
3184         }
3185
3186         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3187                 read_unlock(&bond->lock);
3188                 rtnl_lock();
3189                 read_lock(&bond->lock);
3190
3191                 bond_ab_arp_commit(bond, delta_in_ticks);
3192
3193                 read_unlock(&bond->lock);
3194                 rtnl_unlock();
3195                 read_lock(&bond->lock);
3196         }
3197
3198         bond_ab_arp_probe(bond);
3199
3200 re_arm:
3201         if (bond->params.arp_interval)
3202                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3203 out:
3204         read_unlock(&bond->lock);
3205 }
3206
3207 /*------------------------------ proc/seq_file-------------------------------*/
3208
3209 #ifdef CONFIG_PROC_FS
3210
3211 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3212         __acquires(&dev_base_lock)
3213         __acquires(&bond->lock)
3214 {
3215         struct bonding *bond = seq->private;
3216         loff_t off = 0;
3217         struct slave *slave;
3218         int i;
3219
3220         /* make sure the bond won't be taken away */
3221         read_lock(&dev_base_lock);
3222         read_lock(&bond->lock);
3223
3224         if (*pos == 0)
3225                 return SEQ_START_TOKEN;
3226
3227         bond_for_each_slave(bond, slave, i) {
3228                 if (++off == *pos)
3229                         return slave;
3230         }
3231
3232         return NULL;
3233 }
3234
3235 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3236 {
3237         struct bonding *bond = seq->private;
3238         struct slave *slave = v;
3239
3240         ++*pos;
3241         if (v == SEQ_START_TOKEN)
3242                 return bond->first_slave;
3243
3244         slave = slave->next;
3245
3246         return (slave == bond->first_slave) ? NULL : slave;
3247 }
3248
3249 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3250         __releases(&bond->lock)
3251         __releases(&dev_base_lock)
3252 {
3253         struct bonding *bond = seq->private;
3254
3255         read_unlock(&bond->lock);
3256         read_unlock(&dev_base_lock);
3257 }
3258
3259 static void bond_info_show_master(struct seq_file *seq)
3260 {
3261         struct bonding *bond = seq->private;
3262         struct slave *curr;
3263         int i;
3264
3265         read_lock(&bond->curr_slave_lock);
3266         curr = bond->curr_active_slave;
3267         read_unlock(&bond->curr_slave_lock);
3268
3269         seq_printf(seq, "Bonding Mode: %s",
3270                    bond_mode_name(bond->params.mode));
3271
3272         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3273             bond->params.fail_over_mac)
3274                 seq_printf(seq, " (fail_over_mac %s)",
3275                    fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3276
3277         seq_printf(seq, "\n");
3278
3279         if (bond->params.mode == BOND_MODE_XOR ||
3280                 bond->params.mode == BOND_MODE_8023AD) {
3281                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3282                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3283                         bond->params.xmit_policy);
3284         }
3285
3286         if (USES_PRIMARY(bond->params.mode)) {
3287                 seq_printf(seq, "Primary Slave: %s",
3288                            (bond->primary_slave) ?
3289                            bond->primary_slave->dev->name : "None");
3290                 if (bond->primary_slave)
3291                         seq_printf(seq, " (primary_reselect %s)",
3292                    pri_reselect_tbl[bond->params.primary_reselect].modename);
3293
3294                 seq_printf(seq, "\nCurrently Active Slave: %s\n",
3295                            (curr) ? curr->dev->name : "None");
3296         }
3297
3298         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3299                    "up" : "down");
3300         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3301         seq_printf(seq, "Up Delay (ms): %d\n",
3302                    bond->params.updelay * bond->params.miimon);
3303         seq_printf(seq, "Down Delay (ms): %d\n",
3304                    bond->params.downdelay * bond->params.miimon);
3305
3306
3307         /* ARP information */
3308         if (bond->params.arp_interval > 0) {
3309                 int printed = 0;
3310                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3311                                 bond->params.arp_interval);
3312
3313                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3314
3315                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
3316                         if (!bond->params.arp_targets[i])
3317                                 break;
3318                         if (printed)
3319                                 seq_printf(seq, ",");
3320                         seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3321                         printed = 1;
3322                 }
3323                 seq_printf(seq, "\n");
3324         }
3325
3326         if (bond->params.mode == BOND_MODE_8023AD) {
3327                 struct ad_info ad_info;
3328
3329                 seq_puts(seq, "\n802.3ad info\n");
3330                 seq_printf(seq, "LACP rate: %s\n",
3331                            (bond->params.lacp_fast) ? "fast" : "slow");
3332                 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3333                            ad_select_tbl[bond->params.ad_select].modename);
3334
3335                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3336                         seq_printf(seq, "bond %s has no active aggregator\n",
3337                                    bond->dev->name);
3338                 } else {
3339                         seq_printf(seq, "Active Aggregator Info:\n");
3340
3341                         seq_printf(seq, "\tAggregator ID: %d\n",
3342                                    ad_info.aggregator_id);
3343                         seq_printf(seq, "\tNumber of ports: %d\n",
3344                                    ad_info.ports);
3345                         seq_printf(seq, "\tActor Key: %d\n",
3346                                    ad_info.actor_key);
3347                         seq_printf(seq, "\tPartner Key: %d\n",
3348                                    ad_info.partner_key);
3349                         seq_printf(seq, "\tPartner Mac Address: %pM\n",
3350                                    ad_info.partner_system);
3351                 }
3352         }
3353 }
3354
3355 static void bond_info_show_slave(struct seq_file *seq,
3356                                  const struct slave *slave)
3357 {
3358         struct bonding *bond = seq->private;
3359
3360         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3361         seq_printf(seq, "MII Status: %s\n",
3362                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3363         seq_printf(seq, "Speed: %d Mbps\n", slave->speed);
3364         seq_printf(seq, "Duplex: %s\n", slave->duplex ? "full" : "half");
3365         seq_printf(seq, "Link Failure Count: %u\n",
3366                    slave->link_failure_count);
3367
3368         seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3369
3370         if (bond->params.mode == BOND_MODE_8023AD) {
3371                 const struct aggregator *agg
3372                         = SLAVE_AD_INFO(slave).port.aggregator;
3373
3374                 if (agg)
3375                         seq_printf(seq, "Aggregator ID: %d\n",
3376                                    agg->aggregator_identifier);
3377                 else
3378                         seq_puts(seq, "Aggregator ID: N/A\n");
3379         }
3380         seq_printf(seq, "Slave queue ID: %d\n", slave->queue_id);
3381 }
3382
3383 static int bond_info_seq_show(struct seq_file *seq, void *v)
3384 {
3385         if (v == SEQ_START_TOKEN) {
3386                 seq_printf(seq, "%s\n", version);
3387                 bond_info_show_master(seq);
3388         } else
3389                 bond_info_show_slave(seq, v);
3390
3391         return 0;
3392 }
3393
3394 static const struct seq_operations bond_info_seq_ops = {
3395         .start = bond_info_seq_start,
3396         .next  = bond_info_seq_next,
3397         .stop  = bond_info_seq_stop,
3398         .show  = bond_info_seq_show,
3399 };
3400
3401 static int bond_info_open(struct inode *inode, struct file *file)
3402 {
3403         struct seq_file *seq;
3404         struct proc_dir_entry *proc;
3405         int res;
3406
3407         res = seq_open(file, &bond_info_seq_ops);
3408         if (!res) {
3409                 /* recover the pointer buried in proc_dir_entry data */
3410                 seq = file->private_data;
3411                 proc = PDE(inode);
3412                 seq->private = proc->data;
3413         }
3414
3415         return res;
3416 }
3417
3418 static const struct file_operations bond_info_fops = {
3419         .owner   = THIS_MODULE,
3420         .open    = bond_info_open,
3421         .read    = seq_read,
3422         .llseek  = seq_lseek,
3423         .release = seq_release,
3424 };
3425
3426 static void bond_create_proc_entry(struct bonding *bond)
3427 {
3428         struct net_device *bond_dev = bond->dev;
3429         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3430
3431         if (bn->proc_dir) {
3432                 bond->proc_entry = proc_create_data(bond_dev->name,
3433                                                     S_IRUGO, bn->proc_dir,
3434                                                     &bond_info_fops, bond);
3435                 if (bond->proc_entry == NULL)
3436                         pr_warning("Warning: Cannot create /proc/net/%s/%s\n",
3437                                    DRV_NAME, bond_dev->name);
3438                 else
3439                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3440         }
3441 }
3442
3443 static void bond_remove_proc_entry(struct bonding *bond)
3444 {
3445         struct net_device *bond_dev = bond->dev;
3446         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3447
3448         if (bn->proc_dir && bond->proc_entry) {
3449                 remove_proc_entry(bond->proc_file_name, bn->proc_dir);
3450                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3451                 bond->proc_entry = NULL;
3452         }
3453 }
3454
3455 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3456  * Caller must hold rtnl_lock.
3457  */
3458 static void __net_init bond_create_proc_dir(struct bond_net *bn)
3459 {
3460         if (!bn->proc_dir) {
3461                 bn->proc_dir = proc_mkdir(DRV_NAME, bn->net->proc_net);
3462                 if (!bn->proc_dir)
3463                         pr_warning("Warning: cannot create /proc/net/%s\n",
3464                                    DRV_NAME);
3465         }
3466 }
3467
3468 /* Destroy the bonding directory under /proc/net, if empty.
3469  * Caller must hold rtnl_lock.
3470  */
3471 static void __net_exit bond_destroy_proc_dir(struct bond_net *bn)
3472 {
3473         if (bn->proc_dir) {
3474                 remove_proc_entry(DRV_NAME, bn->net->proc_net);
3475                 bn->proc_dir = NULL;
3476         }
3477 }
3478
3479 #else /* !CONFIG_PROC_FS */
3480
3481 static void bond_create_proc_entry(struct bonding *bond)
3482 {
3483 }
3484
3485 static void bond_remove_proc_entry(struct bonding *bond)
3486 {
3487 }
3488
3489 static inline void bond_create_proc_dir(struct bond_net *bn)
3490 {
3491 }
3492
3493 static inline void bond_destroy_proc_dir(struct bond_net *bn)
3494 {
3495 }
3496
3497 #endif /* CONFIG_PROC_FS */
3498
3499
3500 /*-------------------------- netdev event handling --------------------------*/
3501
3502 /*
3503  * Change device name
3504  */
3505 static int bond_event_changename(struct bonding *bond)
3506 {
3507         bond_remove_proc_entry(bond);
3508         bond_create_proc_entry(bond);
3509
3510         return NOTIFY_DONE;
3511 }
3512
3513 static int bond_master_netdev_event(unsigned long event,
3514                                     struct net_device *bond_dev)
3515 {
3516         struct bonding *event_bond = netdev_priv(bond_dev);
3517
3518         switch (event) {
3519         case NETDEV_CHANGENAME:
3520                 return bond_event_changename(event_bond);
3521         default:
3522                 break;
3523         }
3524
3525         return NOTIFY_DONE;
3526 }
3527
3528 static int bond_slave_netdev_event(unsigned long event,
3529                                    struct net_device *slave_dev)
3530 {
3531         struct net_device *bond_dev = slave_dev->master;
3532         struct bonding *bond = netdev_priv(bond_dev);
3533
3534         switch (event) {
3535         case NETDEV_UNREGISTER:
3536                 if (bond_dev) {
3537                         if (bond->setup_by_slave)
3538                                 bond_release_and_destroy(bond_dev, slave_dev);
3539                         else
3540                                 bond_release(bond_dev, slave_dev);
3541                 }
3542                 break;
3543         case NETDEV_CHANGE:
3544                 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3545                         struct slave *slave;
3546
3547                         slave = bond_get_slave_by_dev(bond, slave_dev);
3548                         if (slave) {
3549                                 u16 old_speed = slave->speed;
3550                                 u16 old_duplex = slave->duplex;
3551
3552                                 bond_update_speed_duplex(slave);
3553
3554                                 if (bond_is_lb(bond))
3555                                         break;
3556
3557                                 if (old_speed != slave->speed)
3558                                         bond_3ad_adapter_speed_changed(slave);
3559                                 if (old_duplex != slave->duplex)
3560                                         bond_3ad_adapter_duplex_changed(slave);
3561                         }
3562                 }
3563
3564                 break;
3565         case NETDEV_DOWN:
3566                 /*
3567                  * ... Or is it this?
3568                  */
3569                 break;
3570         case NETDEV_CHANGEMTU:
3571                 /*
3572                  * TODO: Should slaves be allowed to
3573                  * independently alter their MTU?  For
3574                  * an active-backup bond, slaves need
3575                  * not be the same type of device, so
3576                  * MTUs may vary.  For other modes,
3577                  * slaves arguably should have the
3578                  * same MTUs. To do this, we'd need to
3579                  * take over the slave's change_mtu
3580                  * function for the duration of their
3581                  * servitude.
3582                  */
3583                 break;
3584         case NETDEV_CHANGENAME:
3585                 /*
3586                  * TODO: handle changing the primary's name
3587                  */
3588                 break;
3589         case NETDEV_FEAT_CHANGE:
3590                 bond_compute_features(bond);
3591                 break;
3592         default:
3593                 break;
3594         }
3595
3596         return NOTIFY_DONE;
3597 }
3598
3599 /*
3600  * bond_netdev_event: handle netdev notifier chain events.
3601  *
3602  * This function receives events for the netdev chain.  The caller (an
3603  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3604  * locks for us to safely manipulate the slave devices (RTNL lock,
3605  * dev_probe_lock).
3606  */
3607 static int bond_netdev_event(struct notifier_block *this,
3608                              unsigned long event, void *ptr)
3609 {
3610         struct net_device *event_dev = (struct net_device *)ptr;
3611
3612         pr_debug("event_dev: %s, event: %lx\n",
3613                  event_dev ? event_dev->name : "None",
3614                  event);
3615
3616         if (!(event_dev->priv_flags & IFF_BONDING))
3617                 return NOTIFY_DONE;
3618
3619         if (event_dev->flags & IFF_MASTER) {
3620                 pr_debug("IFF_MASTER\n");
3621                 return bond_master_netdev_event(event, event_dev);
3622         }
3623
3624         if (event_dev->flags & IFF_SLAVE) {
3625                 pr_debug("IFF_SLAVE\n");
3626                 return bond_slave_netdev_event(event, event_dev);
3627         }
3628
3629         return NOTIFY_DONE;
3630 }
3631
3632 /*
3633  * bond_inetaddr_event: handle inetaddr notifier chain events.
3634  *
3635  * We keep track of device IPs primarily to use as source addresses in
3636  * ARP monitor probes (rather than spewing out broadcasts all the time).
3637  *
3638  * We track one IP for the main device (if it has one), plus one per VLAN.
3639  */
3640 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3641 {
3642         struct in_ifaddr *ifa = ptr;
3643         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3644         struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3645         struct bonding *bond;
3646         struct vlan_entry *vlan;
3647
3648         list_for_each_entry(bond, &bn->dev_list, bond_list) {
3649                 if (bond->dev == event_dev) {
3650                         switch (event) {
3651                         case NETDEV_UP:
3652                                 bond->master_ip = ifa->ifa_local;
3653                                 return NOTIFY_OK;
3654                         case NETDEV_DOWN:
3655                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3656                                 return NOTIFY_OK;
3657                         default:
3658                                 return NOTIFY_DONE;
3659                         }
3660                 }
3661
3662                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3663                         if (!bond->vlgrp)
3664                                 continue;
3665                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3666                         if (vlan_dev == event_dev) {
3667                                 switch (event) {
3668                                 case NETDEV_UP:
3669                                         vlan->vlan_ip = ifa->ifa_local;
3670                                         return NOTIFY_OK;
3671                                 case NETDEV_DOWN:
3672                                         vlan->vlan_ip =
3673                                                 bond_glean_dev_ip(vlan_dev);
3674                                         return NOTIFY_OK;
3675                                 default:
3676                                         return NOTIFY_DONE;
3677                                 }
3678                         }
3679                 }
3680         }
3681         return NOTIFY_DONE;
3682 }
3683
3684 static struct notifier_block bond_netdev_notifier = {
3685         .notifier_call = bond_netdev_event,
3686 };
3687
3688 static struct notifier_block bond_inetaddr_notifier = {
3689         .notifier_call = bond_inetaddr_event,
3690 };
3691
3692 /*-------------------------- Packet type handling ---------------------------*/
3693
3694 /* register to receive lacpdus on a bond */
3695 static void bond_register_lacpdu(struct bonding *bond)
3696 {
3697         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3698
3699         /* initialize packet type */
3700         pk_type->type = PKT_TYPE_LACPDU;
3701         pk_type->dev = bond->dev;
3702         pk_type->func = bond_3ad_lacpdu_recv;
3703
3704         dev_add_pack(pk_type);
3705 }
3706
3707 /* unregister to receive lacpdus on a bond */
3708 static void bond_unregister_lacpdu(struct bonding *bond)
3709 {
3710         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3711 }
3712
3713 void bond_register_arp(struct bonding *bond)
3714 {
3715         struct packet_type *pt = &bond->arp_mon_pt;
3716
3717         if (pt->type)
3718                 return;
3719
3720         pt->type = htons(ETH_P_ARP);
3721         pt->dev = bond->dev;
3722         pt->func = bond_arp_rcv;
3723         dev_add_pack(pt);
3724 }
3725
3726 void bond_unregister_arp(struct bonding *bond)
3727 {
3728         struct packet_type *pt = &bond->arp_mon_pt;
3729
3730         dev_remove_pack(pt);
3731         pt->type = 0;
3732 }
3733
3734 /*---------------------------- Hashing Policies -----------------------------*/
3735
3736 /*
3737  * Hash for the output device based upon layer 2 and layer 3 data. If
3738  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3739  */
3740 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3741 {
3742         struct ethhdr *data = (struct ethhdr *)skb->data;
3743         struct iphdr *iph = ip_hdr(skb);
3744
3745         if (skb->protocol == htons(ETH_P_IP)) {
3746                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3747                         (data->h_dest[5] ^ data->h_source[5])) % count;
3748         }
3749
3750         return (data->h_dest[5] ^ data->h_source[5]) % count;
3751 }
3752
3753 /*
3754  * Hash for the output device based upon layer 3 and layer 4 data. If
3755  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3756  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3757  */
3758 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3759 {
3760         struct ethhdr *data = (struct ethhdr *)skb->data;
3761         struct iphdr *iph = ip_hdr(skb);
3762         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3763         int layer4_xor = 0;
3764
3765         if (skb->protocol == htons(ETH_P_IP)) {
3766                 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3767                     (iph->protocol == IPPROTO_TCP ||
3768                      iph->protocol == IPPROTO_UDP)) {
3769                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3770                 }
3771                 return (layer4_xor ^
3772                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3773
3774         }
3775
3776         return (data->h_dest[5] ^ data->h_source[5]) % count;
3777 }
3778
3779 /*
3780  * Hash for the output device based upon layer 2 data
3781  */
3782 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3783 {
3784         struct ethhdr *data = (struct ethhdr *)skb->data;
3785
3786         return (data->h_dest[5] ^ data->h_source[5]) % count;
3787 }
3788
3789 /*-------------------------- Device entry points ----------------------------*/
3790
3791 static int bond_open(struct net_device *bond_dev)
3792 {
3793         struct bonding *bond = netdev_priv(bond_dev);
3794
3795         bond->kill_timers = 0;
3796
3797         INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3798
3799         if (bond_is_lb(bond)) {
3800                 /* bond_alb_initialize must be called before the timer
3801                  * is started.
3802                  */
3803                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3804                         /* something went wrong - fail the open operation */
3805                         return -ENOMEM;
3806                 }
3807
3808                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3809                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3810         }
3811
3812         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3813                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3814                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3815         }
3816
3817         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3818                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3819                         INIT_DELAYED_WORK(&bond->arp_work,
3820                                           bond_activebackup_arp_mon);
3821                 else
3822                         INIT_DELAYED_WORK(&bond->arp_work,
3823                                           bond_loadbalance_arp_mon);
3824
3825                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3826                 if (bond->params.arp_validate)
3827                         bond_register_arp(bond);
3828         }
3829
3830         if (bond->params.mode == BOND_MODE_8023AD) {
3831                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3832                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3833                 /* register to receive LACPDUs */
3834                 bond_register_lacpdu(bond);
3835                 bond_3ad_initiate_agg_selection(bond, 1);
3836         }
3837
3838         return 0;
3839 }
3840
3841 static int bond_close(struct net_device *bond_dev)
3842 {
3843         struct bonding *bond = netdev_priv(bond_dev);
3844
3845         if (bond->params.mode == BOND_MODE_8023AD) {
3846                 /* Unregister the receive of LACPDUs */
3847                 bond_unregister_lacpdu(bond);
3848         }
3849
3850         if (bond->params.arp_validate)
3851                 bond_unregister_arp(bond);
3852
3853         write_lock_bh(&bond->lock);
3854
3855         bond->send_grat_arp = 0;
3856         bond->send_unsol_na = 0;
3857
3858         /* signal timers not to re-arm */
3859         bond->kill_timers = 1;
3860
3861         write_unlock_bh(&bond->lock);
3862
3863         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3864                 cancel_delayed_work(&bond->mii_work);
3865         }
3866
3867         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3868                 cancel_delayed_work(&bond->arp_work);
3869         }
3870
3871         switch (bond->params.mode) {
3872         case BOND_MODE_8023AD:
3873                 cancel_delayed_work(&bond->ad_work);
3874                 break;
3875         case BOND_MODE_TLB:
3876         case BOND_MODE_ALB:
3877                 cancel_delayed_work(&bond->alb_work);
3878                 break;
3879         default:
3880                 break;
3881         }
3882
3883         if (delayed_work_pending(&bond->mcast_work))
3884                 cancel_delayed_work(&bond->mcast_work);
3885
3886         if (bond_is_lb(bond)) {
3887                 /* Must be called only after all
3888                  * slaves have been released
3889                  */
3890                 bond_alb_deinitialize(bond);
3891         }
3892
3893         return 0;
3894 }
3895
3896 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3897                                                 struct rtnl_link_stats64 *stats)
3898 {
3899         struct bonding *bond = netdev_priv(bond_dev);
3900         struct rtnl_link_stats64 temp;
3901         struct slave *slave;
3902         int i;
3903
3904         memset(stats, 0, sizeof(*stats));
3905
3906         read_lock_bh(&bond->lock);
3907
3908         bond_for_each_slave(bond, slave, i) {
3909                 const struct rtnl_link_stats64 *sstats =
3910                         dev_get_stats(slave->dev, &temp);
3911
3912                 stats->rx_packets += sstats->rx_packets;
3913                 stats->rx_bytes += sstats->rx_bytes;
3914                 stats->rx_errors += sstats->rx_errors;
3915                 stats->rx_dropped += sstats->rx_dropped;
3916
3917                 stats->tx_packets += sstats->tx_packets;
3918                 stats->tx_bytes += sstats->tx_bytes;
3919                 stats->tx_errors += sstats->tx_errors;
3920                 stats->tx_dropped += sstats->tx_dropped;
3921
3922                 stats->multicast += sstats->multicast;
3923                 stats->collisions += sstats->collisions;
3924
3925                 stats->rx_length_errors += sstats->rx_length_errors;
3926                 stats->rx_over_errors += sstats->rx_over_errors;
3927                 stats->rx_crc_errors += sstats->rx_crc_errors;
3928                 stats->rx_frame_errors += sstats->rx_frame_errors;
3929                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3930                 stats->rx_missed_errors += sstats->rx_missed_errors;
3931
3932                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3933                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3934                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3935                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3936                 stats->tx_window_errors += sstats->tx_window_errors;
3937         }
3938
3939         read_unlock_bh(&bond->lock);
3940
3941         return stats;
3942 }
3943
3944 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3945 {
3946         struct net_device *slave_dev = NULL;
3947         struct ifbond k_binfo;
3948         struct ifbond __user *u_binfo = NULL;
3949         struct ifslave k_sinfo;
3950         struct ifslave __user *u_sinfo = NULL;
3951         struct mii_ioctl_data *mii = NULL;
3952         int res = 0;
3953
3954         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3955
3956         switch (cmd) {
3957         case SIOCGMIIPHY:
3958                 mii = if_mii(ifr);
3959                 if (!mii)
3960                         return -EINVAL;
3961
3962                 mii->phy_id = 0;
3963                 /* Fall Through */
3964         case SIOCGMIIREG:
3965                 /*
3966                  * We do this again just in case we were called by SIOCGMIIREG
3967                  * instead of SIOCGMIIPHY.
3968                  */
3969                 mii = if_mii(ifr);
3970                 if (!mii)
3971                         return -EINVAL;
3972
3973
3974                 if (mii->reg_num == 1) {
3975                         struct bonding *bond = netdev_priv(bond_dev);
3976                         mii->val_out = 0;
3977                         read_lock(&bond->lock);
3978                         read_lock(&bond->curr_slave_lock);
3979                         if (netif_carrier_ok(bond->dev))
3980                                 mii->val_out = BMSR_LSTATUS;
3981
3982                         read_unlock(&bond->curr_slave_lock);
3983                         read_unlock(&bond->lock);
3984                 }
3985
3986                 return 0;
3987         case BOND_INFO_QUERY_OLD:
3988         case SIOCBONDINFOQUERY:
3989                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3990
3991                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3992                         return -EFAULT;
3993
3994                 res = bond_info_query(bond_dev, &k_binfo);
3995                 if (res == 0 &&
3996                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3997                         return -EFAULT;
3998
3999                 return res;
4000         case BOND_SLAVE_INFO_QUERY_OLD:
4001         case SIOCBONDSLAVEINFOQUERY:
4002                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
4003
4004                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
4005                         return -EFAULT;
4006
4007                 res = bond_slave_info_query(bond_dev, &k_sinfo);
4008                 if (res == 0 &&
4009                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
4010                         return -EFAULT;
4011
4012                 return res;
4013         default:
4014                 /* Go on */
4015                 break;
4016         }
4017
4018         if (!capable(CAP_NET_ADMIN))
4019                 return -EPERM;
4020
4021         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
4022
4023         pr_debug("slave_dev=%p:\n", slave_dev);
4024
4025         if (!slave_dev)
4026                 res = -ENODEV;
4027         else {
4028                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
4029                 switch (cmd) {
4030                 case BOND_ENSLAVE_OLD:
4031                 case SIOCBONDENSLAVE:
4032                         res = bond_enslave(bond_dev, slave_dev);
4033                         break;
4034                 case BOND_RELEASE_OLD:
4035                 case SIOCBONDRELEASE:
4036                         res = bond_release(bond_dev, slave_dev);
4037                         break;
4038                 case BOND_SETHWADDR_OLD:
4039                 case SIOCBONDSETHWADDR:
4040                         res = bond_sethwaddr(bond_dev, slave_dev);
4041                         break;
4042                 case BOND_CHANGE_ACTIVE_OLD:
4043                 case SIOCBONDCHANGEACTIVE:
4044                         res = bond_ioctl_change_active(bond_dev, slave_dev);
4045                         break;
4046                 default:
4047                         res = -EOPNOTSUPP;
4048                 }
4049
4050                 dev_put(slave_dev);
4051         }
4052
4053         return res;
4054 }
4055
4056 static bool bond_addr_in_mc_list(unsigned char *addr,
4057                                  struct netdev_hw_addr_list *list,
4058                                  int addrlen)
4059 {
4060         struct netdev_hw_addr *ha;
4061
4062         netdev_hw_addr_list_for_each(ha, list)
4063                 if (!memcmp(ha->addr, addr, addrlen))
4064                         return true;
4065
4066         return false;
4067 }
4068
4069 static void bond_set_multicast_list(struct net_device *bond_dev)
4070 {
4071         struct bonding *bond = netdev_priv(bond_dev);
4072         struct netdev_hw_addr *ha;
4073         bool found;
4074
4075         /*
4076          * Do promisc before checking multicast_mode
4077          */
4078         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
4079                 /*
4080                  * FIXME: Need to handle the error when one of the multi-slaves
4081                  * encounters error.
4082                  */
4083                 bond_set_promiscuity(bond, 1);
4084
4085
4086         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
4087                 bond_set_promiscuity(bond, -1);
4088
4089
4090         /* set allmulti flag to slaves */
4091         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
4092                 /*
4093                  * FIXME: Need to handle the error when one of the multi-slaves
4094                  * encounters error.
4095                  */
4096                 bond_set_allmulti(bond, 1);
4097
4098
4099         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
4100                 bond_set_allmulti(bond, -1);
4101
4102
4103         read_lock(&bond->lock);
4104
4105         bond->flags = bond_dev->flags;
4106
4107         /* looking for addresses to add to slaves' mc list */
4108         netdev_for_each_mc_addr(ha, bond_dev) {
4109                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
4110                                              bond_dev->addr_len);
4111                 if (!found)
4112                         bond_mc_add(bond, ha->addr);
4113         }
4114
4115         /* looking for addresses to delete from slaves' list */
4116         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
4117                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
4118                                              bond_dev->addr_len);
4119                 if (!found)
4120                         bond_mc_del(bond, ha->addr);
4121         }
4122
4123         /* save master's multicast list */
4124         __hw_addr_flush(&bond->mc_list);
4125         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
4126                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
4127
4128         read_unlock(&bond->lock);
4129 }
4130
4131 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
4132 {
4133         struct bonding *bond = netdev_priv(dev);
4134         struct slave *slave = bond->first_slave;
4135
4136         if (slave) {
4137                 const struct net_device_ops *slave_ops
4138                         = slave->dev->netdev_ops;
4139                 if (slave_ops->ndo_neigh_setup)
4140                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
4141         }
4142         return 0;
4143 }
4144
4145 /*
4146  * Change the MTU of all of a master's slaves to match the master
4147  */
4148 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4149 {
4150         struct bonding *bond = netdev_priv(bond_dev);
4151         struct slave *slave, *stop_at;
4152         int res = 0;
4153         int i;
4154
4155         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
4156                  (bond_dev ? bond_dev->name : "None"), new_mtu);
4157
4158         /* Can't hold bond->lock with bh disabled here since
4159          * some base drivers panic. On the other hand we can't
4160          * hold bond->lock without bh disabled because we'll
4161          * deadlock. The only solution is to rely on the fact
4162          * that we're under rtnl_lock here, and the slaves
4163          * list won't change. This doesn't solve the problem
4164          * of setting the slave's MTU while it is
4165          * transmitting, but the assumption is that the base
4166          * driver can handle that.
4167          *
4168          * TODO: figure out a way to safely iterate the slaves
4169          * list, but without holding a lock around the actual
4170          * call to the base driver.
4171          */
4172
4173         bond_for_each_slave(bond, slave, i) {
4174                 pr_debug("s %p s->p %p c_m %p\n",
4175                          slave,
4176                          slave->prev,
4177                          slave->dev->netdev_ops->ndo_change_mtu);
4178
4179                 res = dev_set_mtu(slave->dev, new_mtu);
4180
4181                 if (res) {
4182                         /* If we failed to set the slave's mtu to the new value
4183                          * we must abort the operation even in ACTIVE_BACKUP
4184                          * mode, because if we allow the backup slaves to have
4185                          * different mtu values than the active slave we'll
4186                          * need to change their mtu when doing a failover. That
4187                          * means changing their mtu from timer context, which
4188                          * is probably not a good idea.
4189                          */
4190                         pr_debug("err %d %s\n", res, slave->dev->name);
4191                         goto unwind;
4192                 }
4193         }
4194
4195         bond_dev->mtu = new_mtu;
4196
4197         return 0;
4198
4199 unwind:
4200         /* unwind from head to the slave that failed */
4201         stop_at = slave;
4202         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4203                 int tmp_res;
4204
4205                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4206                 if (tmp_res) {
4207                         pr_debug("unwind err %d dev %s\n",
4208                                  tmp_res, slave->dev->name);
4209                 }
4210         }
4211
4212         return res;
4213 }
4214
4215 /*
4216  * Change HW address
4217  *
4218  * Note that many devices must be down to change the HW address, and
4219  * downing the master releases all slaves.  We can make bonds full of
4220  * bonding devices to test this, however.
4221  */
4222 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4223 {
4224         struct bonding *bond = netdev_priv(bond_dev);
4225         struct sockaddr *sa = addr, tmp_sa;
4226         struct slave *slave, *stop_at;
4227         int res = 0;
4228         int i;
4229
4230         if (bond->params.mode == BOND_MODE_ALB)
4231                 return bond_alb_set_mac_address(bond_dev, addr);
4232
4233
4234         pr_debug("bond=%p, name=%s\n",
4235                  bond, bond_dev ? bond_dev->name : "None");
4236
4237         /*
4238          * If fail_over_mac is set to active, do nothing and return
4239          * success.  Returning an error causes ifenslave to fail.
4240          */
4241         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4242                 return 0;
4243
4244         if (!is_valid_ether_addr(sa->sa_data))
4245                 return -EADDRNOTAVAIL;
4246
4247         /* Can't hold bond->lock with bh disabled here since
4248          * some base drivers panic. On the other hand we can't
4249          * hold bond->lock without bh disabled because we'll
4250          * deadlock. The only solution is to rely on the fact
4251          * that we're under rtnl_lock here, and the slaves
4252          * list won't change. This doesn't solve the problem
4253          * of setting the slave's hw address while it is
4254          * transmitting, but the assumption is that the base
4255          * driver can handle that.
4256          *
4257          * TODO: figure out a way to safely iterate the slaves
4258          * list, but without holding a lock around the actual
4259          * call to the base driver.
4260          */
4261
4262         bond_for_each_slave(bond, slave, i) {
4263                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4264                 pr_debug("slave %p %s\n", slave, slave->dev->name);
4265
4266                 if (slave_ops->ndo_set_mac_address == NULL) {
4267                         res = -EOPNOTSUPP;
4268                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4269                         goto unwind;
4270                 }
4271
4272                 res = dev_set_mac_address(slave->dev, addr);
4273                 if (res) {
4274                         /* TODO: consider downing the slave
4275                          * and retry ?
4276                          * User should expect communications
4277                          * breakage anyway until ARP finish
4278                          * updating, so...
4279                          */
4280                         pr_debug("err %d %s\n", res, slave->dev->name);
4281                         goto unwind;
4282                 }
4283         }
4284
4285         /* success */
4286         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4287         return 0;
4288
4289 unwind:
4290         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4291         tmp_sa.sa_family = bond_dev->type;
4292
4293         /* unwind from head to the slave that failed */
4294         stop_at = slave;
4295         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4296                 int tmp_res;
4297
4298                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4299                 if (tmp_res) {
4300                         pr_debug("unwind err %d dev %s\n",
4301                                  tmp_res, slave->dev->name);
4302                 }
4303         }
4304
4305         return res;
4306 }
4307
4308 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4309 {
4310         struct bonding *bond = netdev_priv(bond_dev);
4311         struct slave *slave, *start_at;
4312         int i, slave_no, res = 1;
4313         struct iphdr *iph = ip_hdr(skb);
4314
4315         read_lock(&bond->lock);
4316
4317         if (!BOND_IS_OK(bond))
4318                 goto out;
4319         /*
4320          * Start with the curr_active_slave that joined the bond as the
4321          * default for sending IGMP traffic.  For failover purposes one
4322          * needs to maintain some consistency for the interface that will
4323          * send the join/membership reports.  The curr_active_slave found
4324          * will send all of this type of traffic.
4325          */
4326         if ((iph->protocol == IPPROTO_IGMP) &&
4327             (skb->protocol == htons(ETH_P_IP))) {
4328
4329                 read_lock(&bond->curr_slave_lock);
4330                 slave = bond->curr_active_slave;
4331                 read_unlock(&bond->curr_slave_lock);
4332
4333                 if (!slave)
4334                         goto out;
4335         } else {
4336                 /*
4337                  * Concurrent TX may collide on rr_tx_counter; we accept
4338                  * that as being rare enough not to justify using an
4339                  * atomic op here.
4340                  */
4341                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4342
4343                 bond_for_each_slave(bond, slave, i) {
4344                         slave_no--;
4345                         if (slave_no < 0)
4346                                 break;
4347                 }
4348         }
4349
4350         start_at = slave;
4351         bond_for_each_slave_from(bond, slave, i, start_at) {
4352                 if (IS_UP(slave->dev) &&
4353                     (slave->link == BOND_LINK_UP) &&
4354                     (slave->state == BOND_STATE_ACTIVE)) {
4355                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4356                         break;
4357                 }
4358         }
4359
4360 out:
4361         if (res) {
4362                 /* no suitable interface, frame not sent */
4363                 dev_kfree_skb(skb);
4364         }
4365         read_unlock(&bond->lock);
4366         return NETDEV_TX_OK;
4367 }
4368
4369
4370 /*
4371  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4372  * the bond has a usable interface.
4373  */
4374 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4375 {
4376         struct bonding *bond = netdev_priv(bond_dev);
4377         int res = 1;
4378
4379         read_lock(&bond->lock);
4380         read_lock(&bond->curr_slave_lock);
4381
4382         if (!BOND_IS_OK(bond))
4383                 goto out;
4384
4385         if (!bond->curr_active_slave)
4386                 goto out;
4387
4388         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4389
4390 out:
4391         if (res)
4392                 /* no suitable interface, frame not sent */
4393                 dev_kfree_skb(skb);
4394
4395         read_unlock(&bond->curr_slave_lock);
4396         read_unlock(&bond->lock);
4397         return NETDEV_TX_OK;
4398 }
4399
4400 /*
4401  * In bond_xmit_xor() , we determine the output device by using a pre-
4402  * determined xmit_hash_policy(), If the selected device is not enabled,
4403  * find the next active slave.
4404  */
4405 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4406 {
4407         struct bonding *bond = netdev_priv(bond_dev);
4408         struct slave *slave, *start_at;
4409         int slave_no;
4410         int i;
4411         int res = 1;
4412
4413         read_lock(&bond->lock);
4414
4415         if (!BOND_IS_OK(bond))
4416                 goto out;
4417
4418         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4419
4420         bond_for_each_slave(bond, slave, i) {
4421                 slave_no--;
4422                 if (slave_no < 0)
4423                         break;
4424         }
4425
4426         start_at = slave;
4427
4428         bond_for_each_slave_from(bond, slave, i, start_at) {
4429                 if (IS_UP(slave->dev) &&
4430                     (slave->link == BOND_LINK_UP) &&
4431                     (slave->state == BOND_STATE_ACTIVE)) {
4432                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4433                         break;
4434                 }
4435         }
4436
4437 out:
4438         if (res) {
4439                 /* no suitable interface, frame not sent */
4440                 dev_kfree_skb(skb);
4441         }
4442         read_unlock(&bond->lock);
4443         return NETDEV_TX_OK;
4444 }
4445
4446 /*
4447  * in broadcast mode, we send everything to all usable interfaces.
4448  */
4449 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4450 {
4451         struct bonding *bond = netdev_priv(bond_dev);
4452         struct slave *slave, *start_at;
4453         struct net_device *tx_dev = NULL;
4454         int i;
4455         int res = 1;
4456
4457         read_lock(&bond->lock);
4458
4459         if (!BOND_IS_OK(bond))
4460                 goto out;
4461
4462         read_lock(&bond->curr_slave_lock);
4463         start_at = bond->curr_active_slave;
4464         read_unlock(&bond->curr_slave_lock);
4465
4466         if (!start_at)
4467                 goto out;
4468
4469         bond_for_each_slave_from(bond, slave, i, start_at) {
4470                 if (IS_UP(slave->dev) &&
4471                     (slave->link == BOND_LINK_UP) &&
4472                     (slave->state == BOND_STATE_ACTIVE)) {
4473                         if (tx_dev) {
4474                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4475                                 if (!skb2) {
4476                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4477                                                bond_dev->name);
4478                                         continue;
4479                                 }
4480
4481                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4482                                 if (res) {
4483                                         dev_kfree_skb(skb2);
4484                                         continue;
4485                                 }
4486                         }
4487                         tx_dev = slave->dev;
4488                 }
4489         }
4490
4491         if (tx_dev)
4492                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4493
4494 out:
4495         if (res)
4496                 /* no suitable interface, frame not sent */
4497                 dev_kfree_skb(skb);
4498
4499         /* frame sent to all suitable interfaces */
4500         read_unlock(&bond->lock);
4501         return NETDEV_TX_OK;
4502 }
4503
4504 /*------------------------- Device initialization ---------------------------*/
4505
4506 static void bond_set_xmit_hash_policy(struct bonding *bond)
4507 {
4508         switch (bond->params.xmit_policy) {
4509         case BOND_XMIT_POLICY_LAYER23:
4510                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4511                 break;
4512         case BOND_XMIT_POLICY_LAYER34:
4513                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4514                 break;
4515         case BOND_XMIT_POLICY_LAYER2:
4516         default:
4517                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4518                 break;
4519         }
4520 }
4521
4522 /*
4523  * Lookup the slave that corresponds to a qid
4524  */
4525 static inline int bond_slave_override(struct bonding *bond,
4526                                       struct sk_buff *skb)
4527 {
4528         int i, res = 1;
4529         struct slave *slave = NULL;
4530         struct slave *check_slave;
4531
4532         read_lock(&bond->lock);
4533
4534         if (!BOND_IS_OK(bond) || !skb->queue_mapping)
4535                 goto out;
4536
4537         /* Find out if any slaves have the same mapping as this skb. */
4538         bond_for_each_slave(bond, check_slave, i) {
4539                 if (check_slave->queue_id == skb->queue_mapping) {
4540                         slave = check_slave;
4541                         break;
4542                 }
4543         }
4544
4545         /* If the slave isn't UP, use default transmit policy. */
4546         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4547             (slave->link == BOND_LINK_UP)) {
4548                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4549         }
4550
4551 out:
4552         read_unlock(&bond->lock);
4553         return res;
4554 }
4555
4556 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4557 {
4558         /*
4559          * This helper function exists to help dev_pick_tx get the correct
4560          * destination queue.  Using a helper function skips the a call to
4561          * skb_tx_hash and will put the skbs in the queue we expect on their
4562          * way down to the bonding driver.
4563          */
4564         return skb->queue_mapping;
4565 }
4566
4567 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4568 {
4569         struct bonding *bond = netdev_priv(dev);
4570
4571         /*
4572          * If we risk deadlock from transmitting this in the
4573          * netpoll path, tell netpoll to queue the frame for later tx
4574          */
4575         if (is_netpoll_tx_blocked(dev))
4576                 return NETDEV_TX_BUSY;
4577
4578         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4579                 if (!bond_slave_override(bond, skb))
4580                         return NETDEV_TX_OK;
4581         }
4582
4583         switch (bond->params.mode) {
4584         case BOND_MODE_ROUNDROBIN:
4585                 return bond_xmit_roundrobin(skb, dev);
4586         case BOND_MODE_ACTIVEBACKUP:
4587                 return bond_xmit_activebackup(skb, dev);
4588         case BOND_MODE_XOR:
4589                 return bond_xmit_xor(skb, dev);
4590         case BOND_MODE_BROADCAST:
4591                 return bond_xmit_broadcast(skb, dev);
4592         case BOND_MODE_8023AD:
4593                 return bond_3ad_xmit_xor(skb, dev);
4594         case BOND_MODE_ALB:
4595         case BOND_MODE_TLB:
4596                 return bond_alb_xmit(skb, dev);
4597         default:
4598                 /* Should never happen, mode already checked */
4599                 pr_err("%s: Error: Unknown bonding mode %d\n",
4600                        dev->name, bond->params.mode);
4601                 WARN_ON_ONCE(1);
4602                 dev_kfree_skb(skb);
4603                 return NETDEV_TX_OK;
4604         }
4605 }
4606
4607
4608 /*
4609  * set bond mode specific net device operations
4610  */
4611 void bond_set_mode_ops(struct bonding *bond, int mode)
4612 {
4613         struct net_device *bond_dev = bond->dev;
4614
4615         switch (mode) {
4616         case BOND_MODE_ROUNDROBIN:
4617                 break;
4618         case BOND_MODE_ACTIVEBACKUP:
4619                 break;
4620         case BOND_MODE_XOR:
4621                 bond_set_xmit_hash_policy(bond);
4622                 break;
4623         case BOND_MODE_BROADCAST:
4624                 break;
4625         case BOND_MODE_8023AD:
4626                 bond_set_master_3ad_flags(bond);
4627                 bond_set_xmit_hash_policy(bond);
4628                 break;
4629         case BOND_MODE_ALB:
4630                 bond_set_master_alb_flags(bond);
4631                 /* FALLTHRU */
4632         case BOND_MODE_TLB:
4633                 break;
4634         default:
4635                 /* Should never happen, mode already checked */
4636                 pr_err("%s: Error: Unknown bonding mode %d\n",
4637                        bond_dev->name, mode);
4638                 break;
4639         }
4640 }
4641
4642 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4643                                     struct ethtool_drvinfo *drvinfo)
4644 {
4645         strncpy(drvinfo->driver, DRV_NAME, 32);
4646         strncpy(drvinfo->version, DRV_VERSION, 32);
4647         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4648 }
4649
4650 static const struct ethtool_ops bond_ethtool_ops = {
4651         .get_drvinfo            = bond_ethtool_get_drvinfo,
4652         .get_link               = ethtool_op_get_link,
4653         .get_tx_csum            = ethtool_op_get_tx_csum,
4654         .get_sg                 = ethtool_op_get_sg,
4655         .get_tso                = ethtool_op_get_tso,
4656         .get_ufo                = ethtool_op_get_ufo,
4657         .get_flags              = ethtool_op_get_flags,
4658 };
4659
4660 static const struct net_device_ops bond_netdev_ops = {
4661         .ndo_init               = bond_init,
4662         .ndo_uninit             = bond_uninit,
4663         .ndo_open               = bond_open,
4664         .ndo_stop               = bond_close,
4665         .ndo_start_xmit         = bond_start_xmit,
4666         .ndo_select_queue       = bond_select_queue,
4667         .ndo_get_stats64        = bond_get_stats,
4668         .ndo_do_ioctl           = bond_do_ioctl,
4669         .ndo_set_multicast_list = bond_set_multicast_list,
4670         .ndo_change_mtu         = bond_change_mtu,
4671         .ndo_set_mac_address    = bond_set_mac_address,
4672         .ndo_neigh_setup        = bond_neigh_setup,
4673         .ndo_vlan_rx_register   = bond_vlan_rx_register,
4674         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4675         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4676 #ifdef CONFIG_NET_POLL_CONTROLLER
4677         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4678         .ndo_poll_controller    = bond_poll_controller,
4679 #endif
4680 };
4681
4682 static void bond_destructor(struct net_device *bond_dev)
4683 {
4684         struct bonding *bond = netdev_priv(bond_dev);
4685         if (bond->wq)
4686                 destroy_workqueue(bond->wq);
4687         free_netdev(bond_dev);
4688 }
4689
4690 static void bond_setup(struct net_device *bond_dev)
4691 {
4692         struct bonding *bond = netdev_priv(bond_dev);
4693
4694         /* initialize rwlocks */
4695         rwlock_init(&bond->lock);
4696         rwlock_init(&bond->curr_slave_lock);
4697
4698         bond->params = bonding_defaults;
4699
4700         /* Initialize pointers */
4701         bond->dev = bond_dev;
4702         INIT_LIST_HEAD(&bond->vlan_list);
4703
4704         /* Initialize the device entry points */
4705         ether_setup(bond_dev);
4706         bond_dev->netdev_ops = &bond_netdev_ops;
4707         bond_dev->ethtool_ops = &bond_ethtool_ops;
4708         bond_set_mode_ops(bond, bond->params.mode);
4709
4710         bond_dev->destructor = bond_destructor;
4711
4712         /* Initialize the device options */
4713         bond_dev->tx_queue_len = 0;
4714         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4715         bond_dev->priv_flags |= IFF_BONDING;
4716         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
4717
4718         if (bond->params.arp_interval)
4719                 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4720
4721         /* At first, we block adding VLANs. That's the only way to
4722          * prevent problems that occur when adding VLANs over an
4723          * empty bond. The block will be removed once non-challenged
4724          * slaves are enslaved.
4725          */
4726         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4727
4728         /* don't acquire bond device's netif_tx_lock when
4729          * transmitting */
4730         bond_dev->features |= NETIF_F_LLTX;
4731
4732         /* By default, we declare the bond to be fully
4733          * VLAN hardware accelerated capable. Special
4734          * care is taken in the various xmit functions
4735          * when there are slaves that are not hw accel
4736          * capable
4737          */
4738         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4739                                NETIF_F_HW_VLAN_RX |
4740                                NETIF_F_HW_VLAN_FILTER);
4741
4742         /* By default, we enable GRO on bonding devices.
4743          * Actual support requires lowlevel drivers are GRO ready.
4744          */
4745         bond_dev->features |= NETIF_F_GRO;
4746 }
4747
4748 static void bond_work_cancel_all(struct bonding *bond)
4749 {
4750         write_lock_bh(&bond->lock);
4751         bond->kill_timers = 1;
4752         write_unlock_bh(&bond->lock);
4753
4754         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4755                 cancel_delayed_work(&bond->mii_work);
4756
4757         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4758                 cancel_delayed_work(&bond->arp_work);
4759
4760         if (bond->params.mode == BOND_MODE_ALB &&
4761             delayed_work_pending(&bond->alb_work))
4762                 cancel_delayed_work(&bond->alb_work);
4763
4764         if (bond->params.mode == BOND_MODE_8023AD &&
4765             delayed_work_pending(&bond->ad_work))
4766                 cancel_delayed_work(&bond->ad_work);
4767
4768         if (delayed_work_pending(&bond->mcast_work))
4769                 cancel_delayed_work(&bond->mcast_work);
4770 }
4771
4772 /*
4773 * Destroy a bonding device.
4774 * Must be under rtnl_lock when this function is called.
4775 */
4776 static void bond_uninit(struct net_device *bond_dev)
4777 {
4778         struct bonding *bond = netdev_priv(bond_dev);
4779         struct vlan_entry *vlan, *tmp;
4780
4781         bond_netpoll_cleanup(bond_dev);
4782
4783         /* Release the bonded slaves */
4784         bond_release_all(bond_dev);
4785
4786         list_del(&bond->bond_list);
4787
4788         bond_work_cancel_all(bond);
4789
4790         bond_remove_proc_entry(bond);
4791
4792         __hw_addr_flush(&bond->mc_list);
4793
4794         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4795                 list_del(&vlan->vlan_list);
4796                 kfree(vlan);
4797         }
4798 }
4799
4800 /*------------------------- Module initialization ---------------------------*/
4801
4802 /*
4803  * Convert string input module parms.  Accept either the
4804  * number of the mode or its string name.  A bit complicated because
4805  * some mode names are substrings of other names, and calls from sysfs
4806  * may have whitespace in the name (trailing newlines, for example).
4807  */
4808 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4809 {
4810         int modeint = -1, i, rv;
4811         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4812
4813         for (p = (char *)buf; *p; p++)
4814                 if (!(isdigit(*p) || isspace(*p)))
4815                         break;
4816
4817         if (*p)
4818                 rv = sscanf(buf, "%20s", modestr);
4819         else
4820                 rv = sscanf(buf, "%d", &modeint);
4821
4822         if (!rv)
4823                 return -1;
4824
4825         for (i = 0; tbl[i].modename; i++) {
4826                 if (modeint == tbl[i].mode)
4827                         return tbl[i].mode;
4828                 if (strcmp(modestr, tbl[i].modename) == 0)
4829                         return tbl[i].mode;
4830         }
4831
4832         return -1;
4833 }
4834
4835 static int bond_check_params(struct bond_params *params)
4836 {
4837         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4838
4839         /*
4840          * Convert string parameters.
4841          */
4842         if (mode) {
4843                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4844                 if (bond_mode == -1) {
4845                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4846                                mode == NULL ? "NULL" : mode);
4847                         return -EINVAL;
4848                 }
4849         }
4850
4851         if (xmit_hash_policy) {
4852                 if ((bond_mode != BOND_MODE_XOR) &&
4853                     (bond_mode != BOND_MODE_8023AD)) {
4854                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4855                                bond_mode_name(bond_mode));
4856                 } else {
4857                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4858                                                         xmit_hashtype_tbl);
4859                         if (xmit_hashtype == -1) {
4860                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4861                                        xmit_hash_policy == NULL ? "NULL" :
4862                                        xmit_hash_policy);
4863                                 return -EINVAL;
4864                         }
4865                 }
4866         }
4867
4868         if (lacp_rate) {
4869                 if (bond_mode != BOND_MODE_8023AD) {
4870                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4871                                 bond_mode_name(bond_mode));
4872                 } else {
4873                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4874                         if (lacp_fast == -1) {
4875                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4876                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4877                                 return -EINVAL;
4878                         }
4879                 }
4880         }
4881
4882         if (ad_select) {
4883                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4884                 if (params->ad_select == -1) {
4885                         pr_err("Error: Invalid ad_select \"%s\"\n",
4886                                ad_select == NULL ? "NULL" : ad_select);
4887                         return -EINVAL;
4888                 }
4889
4890                 if (bond_mode != BOND_MODE_8023AD) {
4891                         pr_warning("ad_select param only affects 802.3ad mode\n");
4892                 }
4893         } else {
4894                 params->ad_select = BOND_AD_STABLE;
4895         }
4896
4897         if (max_bonds < 0) {
4898                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4899                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4900                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4901         }
4902
4903         if (miimon < 0) {
4904                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4905                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4906                 miimon = BOND_LINK_MON_INTERV;
4907         }
4908
4909         if (updelay < 0) {
4910                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4911                            updelay, INT_MAX);
4912                 updelay = 0;
4913         }
4914
4915         if (downdelay < 0) {
4916                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4917                            downdelay, INT_MAX);
4918                 downdelay = 0;
4919         }
4920
4921         if ((use_carrier != 0) && (use_carrier != 1)) {
4922                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4923                            use_carrier);
4924                 use_carrier = 1;
4925         }
4926
4927         if (num_grat_arp < 0 || num_grat_arp > 255) {
4928                 pr_warning("Warning: num_grat_arp (%d) not in range 0-255 so it was reset to 1\n",
4929                            num_grat_arp);
4930                 num_grat_arp = 1;
4931         }
4932
4933         if (num_unsol_na < 0 || num_unsol_na > 255) {
4934                 pr_warning("Warning: num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4935                            num_unsol_na);
4936                 num_unsol_na = 1;
4937         }
4938
4939         /* reset values for 802.3ad */
4940         if (bond_mode == BOND_MODE_8023AD) {
4941                 if (!miimon) {
4942                         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");
4943                         pr_warning("Forcing miimon to 100msec\n");
4944                         miimon = 100;
4945                 }
4946         }
4947
4948         if (tx_queues < 1 || tx_queues > 255) {
4949                 pr_warning("Warning: tx_queues (%d) should be between "
4950                            "1 and 255, resetting to %d\n",
4951                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4952                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4953         }
4954
4955         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4956                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4957                            "not of valid value (0/1), so it was set to "
4958                            "0\n", all_slaves_active);
4959                 all_slaves_active = 0;
4960         }
4961
4962         if (resend_igmp < 0 || resend_igmp > 255) {
4963                 pr_warning("Warning: resend_igmp (%d) should be between "
4964                            "0 and 255, resetting to %d\n",
4965                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4966                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4967         }
4968
4969         /* reset values for TLB/ALB */
4970         if ((bond_mode == BOND_MODE_TLB) ||
4971             (bond_mode == BOND_MODE_ALB)) {
4972                 if (!miimon) {
4973                         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");
4974                         pr_warning("Forcing miimon to 100msec\n");
4975                         miimon = 100;
4976                 }
4977         }
4978
4979         if (bond_mode == BOND_MODE_ALB) {
4980                 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",
4981                           updelay);
4982         }
4983
4984         if (!miimon) {
4985                 if (updelay || downdelay) {
4986                         /* just warn the user the up/down delay will have
4987                          * no effect since miimon is zero...
4988                          */
4989                         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",
4990                                    updelay, downdelay);
4991                 }
4992         } else {
4993                 /* don't allow arp monitoring */
4994                 if (arp_interval) {
4995                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4996                                    miimon, arp_interval);
4997                         arp_interval = 0;
4998                 }
4999
5000                 if ((updelay % miimon) != 0) {
5001                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
5002                                    updelay, miimon,
5003                                    (updelay / miimon) * miimon);
5004                 }
5005
5006                 updelay /= miimon;
5007
5008                 if ((downdelay % miimon) != 0) {
5009                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
5010                                    downdelay, miimon,
5011                                    (downdelay / miimon) * miimon);
5012                 }
5013
5014                 downdelay /= miimon;
5015         }
5016
5017         if (arp_interval < 0) {
5018                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
5019                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
5020                 arp_interval = BOND_LINK_ARP_INTERV;
5021         }
5022
5023         for (arp_ip_count = 0;
5024              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
5025              arp_ip_count++) {
5026                 /* not complete check, but should be good enough to
5027                    catch mistakes */
5028                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
5029                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
5030                                    arp_ip_target[arp_ip_count]);
5031                         arp_interval = 0;
5032                 } else {
5033                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
5034                         arp_target[arp_ip_count] = ip;
5035                 }
5036         }
5037
5038         if (arp_interval && !arp_ip_count) {
5039                 /* don't allow arping if no arp_ip_target given... */
5040                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
5041                            arp_interval);
5042                 arp_interval = 0;
5043         }
5044
5045         if (arp_validate) {
5046                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
5047                         pr_err("arp_validate only supported in active-backup mode\n");
5048                         return -EINVAL;
5049                 }
5050                 if (!arp_interval) {
5051                         pr_err("arp_validate requires arp_interval\n");
5052                         return -EINVAL;
5053                 }
5054
5055                 arp_validate_value = bond_parse_parm(arp_validate,
5056                                                      arp_validate_tbl);
5057                 if (arp_validate_value == -1) {
5058                         pr_err("Error: invalid arp_validate \"%s\"\n",
5059                                arp_validate == NULL ? "NULL" : arp_validate);
5060                         return -EINVAL;
5061                 }
5062         } else
5063                 arp_validate_value = 0;
5064
5065         if (miimon) {
5066                 pr_info("MII link monitoring set to %d ms\n", miimon);
5067         } else if (arp_interval) {
5068                 int i;
5069
5070                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5071                         arp_interval,
5072                         arp_validate_tbl[arp_validate_value].modename,
5073                         arp_ip_count);
5074
5075                 for (i = 0; i < arp_ip_count; i++)
5076                         pr_info(" %s", arp_ip_target[i]);
5077
5078                 pr_info("\n");
5079
5080         } else if (max_bonds) {
5081                 /* miimon and arp_interval not set, we need one so things
5082                  * work as expected, see bonding.txt for details
5083                  */
5084                 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");
5085         }
5086
5087         if (primary && !USES_PRIMARY(bond_mode)) {
5088                 /* currently, using a primary only makes sense
5089                  * in active backup, TLB or ALB modes
5090                  */
5091                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
5092                            primary, bond_mode_name(bond_mode));
5093                 primary = NULL;
5094         }
5095
5096         if (primary && primary_reselect) {
5097                 primary_reselect_value = bond_parse_parm(primary_reselect,
5098                                                          pri_reselect_tbl);
5099                 if (primary_reselect_value == -1) {
5100                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
5101                                primary_reselect ==
5102                                         NULL ? "NULL" : primary_reselect);
5103                         return -EINVAL;
5104                 }
5105         } else {
5106                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5107         }
5108
5109         if (fail_over_mac) {
5110                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
5111                                                       fail_over_mac_tbl);
5112                 if (fail_over_mac_value == -1) {
5113                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
5114                                arp_validate == NULL ? "NULL" : arp_validate);
5115                         return -EINVAL;
5116                 }
5117
5118                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5119                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
5120         } else {
5121                 fail_over_mac_value = BOND_FOM_NONE;
5122         }
5123
5124         /* fill params struct with the proper values */
5125         params->mode = bond_mode;
5126         params->xmit_policy = xmit_hashtype;
5127         params->miimon = miimon;
5128         params->num_grat_arp = num_grat_arp;
5129         params->num_unsol_na = num_unsol_na;
5130         params->arp_interval = arp_interval;
5131         params->arp_validate = arp_validate_value;
5132         params->updelay = updelay;
5133         params->downdelay = downdelay;
5134         params->use_carrier = use_carrier;
5135         params->lacp_fast = lacp_fast;
5136         params->primary[0] = 0;
5137         params->primary_reselect = primary_reselect_value;
5138         params->fail_over_mac = fail_over_mac_value;
5139         params->tx_queues = tx_queues;
5140         params->all_slaves_active = all_slaves_active;
5141         params->resend_igmp = resend_igmp;
5142
5143         if (primary) {
5144                 strncpy(params->primary, primary, IFNAMSIZ);
5145                 params->primary[IFNAMSIZ - 1] = 0;
5146         }
5147
5148         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5149
5150         return 0;
5151 }
5152
5153 static struct lock_class_key bonding_netdev_xmit_lock_key;
5154 static struct lock_class_key bonding_netdev_addr_lock_key;
5155
5156 static void bond_set_lockdep_class_one(struct net_device *dev,
5157                                        struct netdev_queue *txq,
5158                                        void *_unused)
5159 {
5160         lockdep_set_class(&txq->_xmit_lock,
5161                           &bonding_netdev_xmit_lock_key);
5162 }
5163
5164 static void bond_set_lockdep_class(struct net_device *dev)
5165 {
5166         lockdep_set_class(&dev->addr_list_lock,
5167                           &bonding_netdev_addr_lock_key);
5168         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
5169 }
5170
5171 /*
5172  * Called from registration process
5173  */
5174 static int bond_init(struct net_device *bond_dev)
5175 {
5176         struct bonding *bond = netdev_priv(bond_dev);
5177         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5178
5179         pr_debug("Begin bond_init for %s\n", bond_dev->name);
5180
5181         bond->wq = create_singlethread_workqueue(bond_dev->name);
5182         if (!bond->wq)
5183                 return -ENOMEM;
5184
5185         bond_set_lockdep_class(bond_dev);
5186
5187         netif_carrier_off(bond_dev);
5188
5189         bond_create_proc_entry(bond);
5190         list_add_tail(&bond->bond_list, &bn->dev_list);
5191
5192         bond_prepare_sysfs_group(bond);
5193
5194         __hw_addr_init(&bond->mc_list);
5195         return 0;
5196 }
5197
5198 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
5199 {
5200         if (tb[IFLA_ADDRESS]) {
5201                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
5202                         return -EINVAL;
5203                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
5204                         return -EADDRNOTAVAIL;
5205         }
5206         return 0;
5207 }
5208
5209 static struct rtnl_link_ops bond_link_ops __read_mostly = {
5210         .kind           = "bond",
5211         .priv_size      = sizeof(struct bonding),
5212         .setup          = bond_setup,
5213         .validate       = bond_validate,
5214 };
5215
5216 /* Create a new bond based on the specified name and bonding parameters.
5217  * If name is NULL, obtain a suitable "bond%d" name for us.
5218  * Caller must NOT hold rtnl_lock; we need to release it here before we
5219  * set up our sysfs entries.
5220  */
5221 int bond_create(struct net *net, const char *name)
5222 {
5223         struct net_device *bond_dev;
5224         int res;
5225
5226         rtnl_lock();
5227
5228         bond_dev = alloc_netdev_mq(sizeof(struct bonding), name ? name : "",
5229                                 bond_setup, tx_queues);
5230         if (!bond_dev) {
5231                 pr_err("%s: eek! can't alloc netdev!\n", name);
5232                 rtnl_unlock();
5233                 return -ENOMEM;
5234         }
5235
5236         dev_net_set(bond_dev, net);
5237         bond_dev->rtnl_link_ops = &bond_link_ops;
5238
5239         if (!name) {
5240                 res = dev_alloc_name(bond_dev, "bond%d");
5241                 if (res < 0)
5242                         goto out;
5243         } else {
5244                 /*
5245                  * If we're given a name to register
5246                  * we need to ensure that its not already
5247                  * registered
5248                  */
5249                 res = -EEXIST;
5250                 if (__dev_get_by_name(net, name) != NULL)
5251                         goto out;
5252         }
5253
5254         res = register_netdevice(bond_dev);
5255
5256 out:
5257         rtnl_unlock();
5258         if (res < 0)
5259                 bond_destructor(bond_dev);
5260         return res;
5261 }
5262
5263 static int __net_init bond_net_init(struct net *net)
5264 {
5265         struct bond_net *bn = net_generic(net, bond_net_id);
5266
5267         bn->net = net;
5268         INIT_LIST_HEAD(&bn->dev_list);
5269
5270         bond_create_proc_dir(bn);
5271
5272         return 0;
5273 }
5274
5275 static void __net_exit bond_net_exit(struct net *net)
5276 {
5277         struct bond_net *bn = net_generic(net, bond_net_id);
5278
5279         bond_destroy_proc_dir(bn);
5280 }
5281
5282 static struct pernet_operations bond_net_ops = {
5283         .init = bond_net_init,
5284         .exit = bond_net_exit,
5285         .id   = &bond_net_id,
5286         .size = sizeof(struct bond_net),
5287 };
5288
5289 static int __init bonding_init(void)
5290 {
5291         int i;
5292         int res;
5293
5294         pr_info("%s", version);
5295
5296         res = bond_check_params(&bonding_defaults);
5297         if (res)
5298                 goto out;
5299
5300 #ifdef CONFIG_NET_POLL_CONTROLLER
5301         if (!alloc_cpumask_var(&netpoll_block_tx, GFP_KERNEL)) {
5302                 res = -ENOMEM;
5303                 goto out;
5304         }
5305 #endif
5306
5307         res = register_pernet_subsys(&bond_net_ops);
5308         if (res)
5309                 goto out;
5310
5311         res = rtnl_link_register(&bond_link_ops);
5312         if (res)
5313                 goto err_link;
5314
5315         for (i = 0; i < max_bonds; i++) {
5316                 res = bond_create(&init_net, NULL);
5317                 if (res)
5318                         goto err;
5319         }
5320
5321         res = bond_create_sysfs();
5322         if (res)
5323                 goto err;
5324
5325
5326         register_netdevice_notifier(&bond_netdev_notifier);
5327         register_inetaddr_notifier(&bond_inetaddr_notifier);
5328         bond_register_ipv6_notifier();
5329 out:
5330         return res;
5331 err:
5332         rtnl_link_unregister(&bond_link_ops);
5333 err_link:
5334         unregister_pernet_subsys(&bond_net_ops);
5335 #ifdef CONFIG_NET_POLL_CONTROLLER
5336         free_cpumask_var(netpoll_block_tx);
5337 #endif
5338         goto out;
5339
5340 }
5341
5342 static void __exit bonding_exit(void)
5343 {
5344         unregister_netdevice_notifier(&bond_netdev_notifier);
5345         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5346         bond_unregister_ipv6_notifier();
5347
5348         bond_destroy_sysfs();
5349
5350         rtnl_link_unregister(&bond_link_ops);
5351         unregister_pernet_subsys(&bond_net_ops);
5352
5353 #ifdef CONFIG_NET_POLL_CONTROLLER
5354         free_cpumask_var(netpoll_block_tx);
5355 #endif
5356 }
5357
5358 module_init(bonding_init);
5359 module_exit(bonding_exit);
5360 MODULE_LICENSE("GPL");
5361 MODULE_VERSION(DRV_VERSION);
5362 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5363 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5364 MODULE_ALIAS_RTNL_LINK("bond");