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/dma.h>
  58 #include <linux/uaccess.h>
  59 #include <linux/errno.h>
  60 #include <linux/netdevice.h>
  61 #include <linux/inetdevice.h>
  62 #include <linux/igmp.h>
  63 #include <linux/etherdevice.h>
  64 #include <linux/skbuff.h>
  65 #include <net/sock.h>
  66 #include <linux/rtnetlink.h>
  67 #include <linux/smp.h>
  68 #include <linux/if_ether.h>
  69 #include <net/arp.h>
  70 #include <linux/mii.h>
  71 #include <linux/ethtool.h>
  72 #include <linux/if_vlan.h>
  73 #include <linux/if_bonding.h>
  74 #include <linux/jiffies.h>
  75 #include <linux/preempt.h>
  76 #include <net/route.h>
  77 #include <net/net_namespace.h>
  78 #include <net/netns/generic.h>
  79 #include <net/pkt_sched.h>
  80 #include <linux/rculist.h>
  81 #include "bonding.h"
  82 #include "bond_3ad.h"
  83 #include "bond_alb.h"
  84
  85 /*---------------------------- Module parameters ----------------------------*/
  86
  87 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  88 #define BOND_LINK_MON_INTERV    0
  89 #define BOND_LINK_ARP_INTERV    0
  90
  91 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  92 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  93 static int num_peer_notif = 1;
  94 static int miimon       = BOND_LINK_MON_INTERV;
  95 static int updelay;
  96 static int downdelay;
  97 static int use_carrier  = 1;
  98 static char *mode;
  99 static char *primary;
 100 static char *primary_reselect;
 101 static char *lacp_rate;
 102 static int min_links;
 103 static char *ad_select;
 104 static char *xmit_hash_policy;
 105 static int arp_interval = BOND_LINK_ARP_INTERV;
 106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 107 static char *arp_validate;
 108 static char *arp_all_targets;
 109 static char *fail_over_mac;
 110 static int all_slaves_active;
 111 static struct bond_params bonding_defaults;
 112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 113
 114 module_param(max_bonds, int, 0);
 115 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 116 module_param(tx_queues, int, 0);
 117 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 118 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 119 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 120                                "failover event (alias of num_unsol_na)");
 121 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 122 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 123                                "failover event (alias of num_grat_arp)");
 124 module_param(miimon, int, 0);
 125 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 126 module_param(updelay, int, 0);
 127 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 128 module_param(downdelay, int, 0);
 129 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 130                             "in milliseconds");
 131 module_param(use_carrier, int, 0);
 132 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 133                               "0 for off, 1 for on (default)");
 134 module_param(mode, charp, 0);
 135 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 136                        "1 for active-backup, 2 for balance-xor, "
 137                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 138                        "6 for balance-alb");
 139 module_param(primary, charp, 0);
 140 MODULE_PARM_DESC(primary, "Primary network device to use");
 141 module_param(primary_reselect, charp, 0);
 142 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 143                                    "once it comes up; "
 144                                    "0 for always (default), "
 145                                    "1 for only if speed of primary is "
 146                                    "better, "
 147                                    "2 for only on active slave "
 148                                    "failure");
 149 module_param(lacp_rate, charp, 0);
 150 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 151                             "0 for slow, 1 for fast");
 152 module_param(ad_select, charp, 0);
 153 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 154                             "0 for stable (default), 1 for bandwidth, "
 155                             "2 for count");
 156 module_param(min_links, int, 0);
 157 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 158
 159 module_param(xmit_hash_policy, charp, 0);
 160 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 161                                    "0 for layer 2 (default), 1 for layer 3+4, "
 162                                    "2 for layer 2+3");
 163 module_param(arp_interval, int, 0);
 164 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 165 module_param_array(arp_ip_target, charp, NULL, 0);
 166 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 167 module_param(arp_validate, charp, 0);
 168 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 169                                "0 for none (default), 1 for active, "
 170                                "2 for backup, 3 for all");
 171 module_param(arp_all_targets, charp, 0);
 172 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 173 module_param(fail_over_mac, charp, 0);
 174 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 175                                 "the same MAC; 0 for none (default), "
 176                                 "1 for active, 2 for follow");
 177 module_param(all_slaves_active, int, 0);
 178 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 179                                      "by setting active flag for all slaves; "
 180                                      "0 for never (default), 1 for always.");
 181 module_param(resend_igmp, int, 0);
 182 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 183                               "link failure");
 184
 185 /*----------------------------- Global variables ----------------------------*/
 186
 187 #ifdef CONFIG_NET_POLL_CONTROLLER
 188 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 189 #endif
 190
 191 int bond_net_id __read_mostly;
 192
 193 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 194 static int arp_ip_count;
 195 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 196 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 197 static int lacp_fast;
 198
 199 const struct bond_parm_tbl bond_lacp_tbl[] = {
 200 {       "slow",         AD_LACP_SLOW},
 201 {       "fast",         AD_LACP_FAST},
 202 {       NULL,           -1},
 203 };
 204
 205 const struct bond_parm_tbl bond_mode_tbl[] = {
 206 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 207 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 208 {       "balance-xor",          BOND_MODE_XOR},
 209 {       "broadcast",            BOND_MODE_BROADCAST},
 210 {       "802.3ad",              BOND_MODE_8023AD},
 211 {       "balance-tlb",          BOND_MODE_TLB},
 212 {       "balance-alb",          BOND_MODE_ALB},
 213 {       NULL,                   -1},
 214 };
 215
 216 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 217 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 218 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 219 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 220 {       NULL,                   -1},
 221 };
 222
 223 const struct bond_parm_tbl arp_all_targets_tbl[] = {
 224 {       "any",                  BOND_ARP_TARGETS_ANY},
 225 {       "all",                  BOND_ARP_TARGETS_ALL},
 226 {       NULL,                   -1},
 227 };
 228
 229 const struct bond_parm_tbl arp_validate_tbl[] = {
 230 {       "none",                 BOND_ARP_VALIDATE_NONE},
 231 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 232 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 233 {       "all",                  BOND_ARP_VALIDATE_ALL},
 234 {       NULL,                   -1},
 235 };
 236
 237 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 238 {       "none",                 BOND_FOM_NONE},
 239 {       "active",               BOND_FOM_ACTIVE},
 240 {       "follow",               BOND_FOM_FOLLOW},
 241 {       NULL,                   -1},
 242 };
 243
 244 const struct bond_parm_tbl pri_reselect_tbl[] = {
 245 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 246 {       "better",               BOND_PRI_RESELECT_BETTER},
 247 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 248 {       NULL,                   -1},
 249 };
 250
 251 struct bond_parm_tbl ad_select_tbl[] = {
 252 {       "stable",       BOND_AD_STABLE},
 253 {       "bandwidth",    BOND_AD_BANDWIDTH},
 254 {       "count",        BOND_AD_COUNT},
 255 {       NULL,           -1},
 256 };
 257
 258 /*-------------------------- Forward declarations ---------------------------*/
 259
 260 static int bond_init(struct net_device *bond_dev);
 261 static void bond_uninit(struct net_device *bond_dev);
 262
 263 /*---------------------------- General routines -----------------------------*/
 264
 265 const char *bond_mode_name(int mode)
 266 {
 267         static const char *names[] = {
 268                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 269                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 270                 [BOND_MODE_XOR] = "load balancing (xor)",
 271                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 272                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 273                 [BOND_MODE_TLB] = "transmit load balancing",
 274                 [BOND_MODE_ALB] = "adaptive load balancing",
 275         };
 276
 277         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 278                 return "unknown";
 279
 280         return names[mode];
 281 }
 282
 283 /*---------------------------------- VLAN -----------------------------------*/
 284
 285 /**
 286  * bond_dev_queue_xmit - Prepare skb for xmit.
 287  *
 288  * @bond: bond device that got this skb for tx.
 289  * @skb: hw accel VLAN tagged skb to transmit
 290  * @slave_dev: slave that is supposed to xmit this skbuff
 291  */
 292 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 293                         struct net_device *slave_dev)
 294 {
 295         skb->dev = slave_dev;
 296
 297         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 298                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 299         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 300
 301         if (unlikely(netpoll_tx_running(bond->dev)))
 302                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 303         else
 304                 dev_queue_xmit(skb);
 305
 306         return 0;
 307 }
 308
 309 /*
 310  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 311  * We don't protect the slave list iteration with a lock because:
 312  * a. This operation is performed in IOCTL context,
 313  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 314  * c. Holding a lock with BH disabled while directly calling a base driver
 315  *    entry point is generally a BAD idea.
 316  *
 317  * The design of synchronization/protection for this operation in the 8021q
 318  * module is good for one or more VLAN devices over a single physical device
 319  * and cannot be extended for a teaming solution like bonding, so there is a
 320  * potential race condition here where a net device from the vlan group might
 321  * be referenced (either by a base driver or the 8021q code) while it is being
 322  * removed from the system. However, it turns out we're not making matters
 323  * worse, and if it works for regular VLAN usage it will work here too.
 324 */
 325
 326 /**
 327  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 328  * @bond_dev: bonding net device that got called
 329  * @vid: vlan id being added
 330  */
 331 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 332                                 __be16 proto, u16 vid)
 333 {
 334         struct bonding *bond = netdev_priv(bond_dev);
 335         struct slave *slave, *rollback_slave;
 336         struct list_head *iter;
 337         int res;
 338
 339         bond_for_each_slave(bond, slave, iter) {
 340                 res = vlan_vid_add(slave->dev, proto, vid);
 341                 if (res)
 342                         goto unwind;
 343         }
 344
 345         return 0;
 346
 347 unwind:
 348         /* unwind to the slave that failed */
 349         bond_for_each_slave(bond, rollback_slave, iter) {
 350                 if (rollback_slave == slave)
 351                         break;
 352
 353                 vlan_vid_del(rollback_slave->dev, proto, vid);
 354         }
 355
 356         return res;
 357 }
 358
 359 /**
 360  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 361  * @bond_dev: bonding net device that got called
 362  * @vid: vlan id being removed
 363  */
 364 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 365                                  __be16 proto, u16 vid)
 366 {
 367         struct bonding *bond = netdev_priv(bond_dev);
 368         struct list_head *iter;
 369         struct slave *slave;
 370
 371         bond_for_each_slave(bond, slave, iter)
 372                 vlan_vid_del(slave->dev, proto, vid);
 373
 374         if (bond_is_lb(bond))
 375                 bond_alb_clear_vlan(bond, vid);
 376
 377         return 0;
 378 }
 379
 380 /*------------------------------- Link status -------------------------------*/
 381
 382 /*
 383  * Set the carrier state for the master according to the state of its
 384  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 385  * do special 802.3ad magic.
 386  *
 387  * Returns zero if carrier state does not change, nonzero if it does.
 388  */
 389 static int bond_set_carrier(struct bonding *bond)
 390 {
 391         struct list_head *iter;
 392         struct slave *slave;
 393
 394         if (list_empty(&bond->slave_list))
 395                 goto down;
 396
 397         if (bond->params.mode == BOND_MODE_8023AD)
 398                 return bond_3ad_set_carrier(bond);
 399
 400         bond_for_each_slave(bond, slave, iter) {
 401                 if (slave->link == BOND_LINK_UP) {
 402                         if (!netif_carrier_ok(bond->dev)) {
 403                                 netif_carrier_on(bond->dev);
 404                                 return 1;
 405                         }
 406                         return 0;
 407                 }
 408         }
 409
 410 down:
 411         if (netif_carrier_ok(bond->dev)) {
 412                 netif_carrier_off(bond->dev);
 413                 return 1;
 414         }
 415         return 0;
 416 }
 417
 418 /*
 419  * Get link speed and duplex from the slave's base driver
 420  * using ethtool. If for some reason the call fails or the
 421  * values are invalid, set speed and duplex to -1,
 422  * and return.
 423  */
 424 static void bond_update_speed_duplex(struct slave *slave)
 425 {
 426         struct net_device *slave_dev = slave->dev;
 427         struct ethtool_cmd ecmd;
 428         u32 slave_speed;
 429         int res;
 430
 431         slave->speed = SPEED_UNKNOWN;
 432         slave->duplex = DUPLEX_UNKNOWN;
 433
 434         res = __ethtool_get_settings(slave_dev, &ecmd);
 435         if (res < 0)
 436                 return;
 437
 438         slave_speed = ethtool_cmd_speed(&ecmd);
 439         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 440                 return;
 441
 442         switch (ecmd.duplex) {
 443         case DUPLEX_FULL:
 444         case DUPLEX_HALF:
 445                 break;
 446         default:
 447                 return;
 448         }
 449
 450         slave->speed = slave_speed;
 451         slave->duplex = ecmd.duplex;
 452
 453         return;
 454 }
 455
 456 /*
 457  * if <dev> supports MII link status reporting, check its link status.
 458  *
 459  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 460  * depending upon the setting of the use_carrier parameter.
 461  *
 462  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 463  * can't tell and just pretend it is), or 0, meaning that the link is
 464  * down.
 465  *
 466  * If reporting is non-zero, instead of faking link up, return -1 if
 467  * both ETHTOOL and MII ioctls fail (meaning the device does not
 468  * support them).  If use_carrier is set, return whatever it says.
 469  * It'd be nice if there was a good way to tell if a driver supports
 470  * netif_carrier, but there really isn't.
 471  */
 472 static int bond_check_dev_link(struct bonding *bond,
 473                                struct net_device *slave_dev, int reporting)
 474 {
 475         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 476         int (*ioctl)(struct net_device *, struct ifreq *, int);
 477         struct ifreq ifr;
 478         struct mii_ioctl_data *mii;
 479
 480         if (!reporting && !netif_running(slave_dev))
 481                 return 0;
 482
 483         if (bond->params.use_carrier)
 484                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 485
 486         /* Try to get link status using Ethtool first. */
 487         if (slave_dev->ethtool_ops->get_link)
 488                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 489                         BMSR_LSTATUS : 0;
 490
 491         /* Ethtool can't be used, fallback to MII ioctls. */
 492         ioctl = slave_ops->ndo_do_ioctl;
 493         if (ioctl) {
 494                 /* TODO: set pointer to correct ioctl on a per team member */
 495                 /*       bases to make this more efficient. that is, once  */
 496                 /*       we determine the correct ioctl, we will always    */
 497                 /*       call it and not the others for that team          */
 498                 /*       member.                                           */
 499
 500                 /*
 501                  * We cannot assume that SIOCGMIIPHY will also read a
 502                  * register; not all network drivers (e.g., e100)
 503                  * support that.
 504                  */
 505
 506                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 507                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 508                 mii = if_mii(&ifr);
 509                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 510                         mii->reg_num = MII_BMSR;
 511                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 512                                 return mii->val_out & BMSR_LSTATUS;
 513                 }
 514         }
 515
 516         /*
 517          * If reporting, report that either there's no dev->do_ioctl,
 518          * or both SIOCGMIIREG and get_link failed (meaning that we
 519          * cannot report link status).  If not reporting, pretend
 520          * we're ok.
 521          */
 522         return reporting ? -1 : BMSR_LSTATUS;
 523 }
 524
 525 /*----------------------------- Multicast list ------------------------------*/
 526
 527 /*
 528  * Push the promiscuity flag down to appropriate slaves
 529  */
 530 static int bond_set_promiscuity(struct bonding *bond, int inc)
 531 {
 532         struct list_head *iter;
 533         int err = 0;
 534
 535         if (USES_PRIMARY(bond->params.mode)) {
 536                 /* write lock already acquired */
 537                 if (bond->curr_active_slave) {
 538                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 539                                                   inc);
 540                 }
 541         } else {
 542                 struct slave *slave;
 543
 544                 bond_for_each_slave(bond, slave, iter) {
 545                         err = dev_set_promiscuity(slave->dev, inc);
 546                         if (err)
 547                                 return err;
 548                 }
 549         }
 550         return err;
 551 }
 552
 553 /*
 554  * Push the allmulti flag down to all slaves
 555  */
 556 static int bond_set_allmulti(struct bonding *bond, int inc)
 557 {
 558         struct list_head *iter;
 559         int err = 0;
 560
 561         if (USES_PRIMARY(bond->params.mode)) {
 562                 /* write lock already acquired */
 563                 if (bond->curr_active_slave) {
 564                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 565                                                inc);
 566                 }
 567         } else {
 568                 struct slave *slave;
 569
 570                 bond_for_each_slave(bond, slave, iter) {
 571                         err = dev_set_allmulti(slave->dev, inc);
 572                         if (err)
 573                                 return err;
 574                 }
 575         }
 576         return err;
 577 }
 578
 579 /*
 580  * Retrieve the list of registered multicast addresses for the bonding
 581  * device and retransmit an IGMP JOIN request to the current active
 582  * slave.
 583  */
 584 static void bond_resend_igmp_join_requests(struct bonding *bond)
 585 {
 586         if (!rtnl_trylock()) {
 587                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 588                 return;
 589         }
 590         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 591         rtnl_unlock();
 592
 593         /* We use curr_slave_lock to protect against concurrent access to
 594          * igmp_retrans from multiple running instances of this function and
 595          * bond_change_active_slave
 596          */
 597         write_lock_bh(&bond->curr_slave_lock);
 598         if (bond->igmp_retrans > 1) {
 599                 bond->igmp_retrans--;
 600                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 601         }
 602         write_unlock_bh(&bond->curr_slave_lock);
 603 }
 604
 605 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 606 {
 607         struct bonding *bond = container_of(work, struct bonding,
 608                                             mcast_work.work);
 609
 610         bond_resend_igmp_join_requests(bond);
 611 }
 612
 613 /* Flush bond's hardware addresses from slave
 614  */
 615 static void bond_hw_addr_flush(struct net_device *bond_dev,
 616                                struct net_device *slave_dev)
 617 {
 618         struct bonding *bond = netdev_priv(bond_dev);
 619
 620         dev_uc_unsync(slave_dev, bond_dev);
 621         dev_mc_unsync(slave_dev, bond_dev);
 622
 623         if (bond->params.mode == BOND_MODE_8023AD) {
 624                 /* del lacpdu mc addr from mc list */
 625                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 626
 627                 dev_mc_del(slave_dev, lacpdu_multicast);
 628         }
 629 }
 630
 631 /*--------------------------- Active slave change ---------------------------*/
 632
 633 /* Update the hardware address list and promisc/allmulti for the new and
 634  * old active slaves (if any).  Modes that are !USES_PRIMARY keep all
 635  * slaves up date at all times; only the USES_PRIMARY modes need to call
 636  * this function to swap these settings during a failover.
 637  */
 638 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 639                               struct slave *old_active)
 640 {
 641         ASSERT_RTNL();
 642
 643         if (old_active) {
 644                 if (bond->dev->flags & IFF_PROMISC)
 645                         dev_set_promiscuity(old_active->dev, -1);
 646
 647                 if (bond->dev->flags & IFF_ALLMULTI)
 648                         dev_set_allmulti(old_active->dev, -1);
 649
 650                 bond_hw_addr_flush(bond->dev, old_active->dev);
 651         }
 652
 653         if (new_active) {
 654                 /* FIXME: Signal errors upstream. */
 655                 if (bond->dev->flags & IFF_PROMISC)
 656                         dev_set_promiscuity(new_active->dev, 1);
 657
 658                 if (bond->dev->flags & IFF_ALLMULTI)
 659                         dev_set_allmulti(new_active->dev, 1);
 660
 661                 netif_addr_lock_bh(bond->dev);
 662                 dev_uc_sync(new_active->dev, bond->dev);
 663                 dev_mc_sync(new_active->dev, bond->dev);
 664                 netif_addr_unlock_bh(bond->dev);
 665         }
 666 }
 667
 668 /**
 669  * bond_set_dev_addr - clone slave's address to bond
 670  * @bond_dev: bond net device
 671  * @slave_dev: slave net device
 672  *
 673  * Should be called with RTNL held.
 674  */
 675 static void bond_set_dev_addr(struct net_device *bond_dev,
 676                               struct net_device *slave_dev)
 677 {
 678         pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 679                  bond_dev, slave_dev, slave_dev->addr_len);
 680         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 681         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 682         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 683 }
 684
 685 /*
 686  * bond_do_fail_over_mac
 687  *
 688  * Perform special MAC address swapping for fail_over_mac settings
 689  *
 690  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 691  */
 692 static void bond_do_fail_over_mac(struct bonding *bond,
 693                                   struct slave *new_active,
 694                                   struct slave *old_active)
 695         __releases(&bond->curr_slave_lock)
 696         __releases(&bond->lock)
 697         __acquires(&bond->lock)
 698         __acquires(&bond->curr_slave_lock)
 699 {
 700         u8 tmp_mac[ETH_ALEN];
 701         struct sockaddr saddr;
 702         int rv;
 703
 704         switch (bond->params.fail_over_mac) {
 705         case BOND_FOM_ACTIVE:
 706                 if (new_active) {
 707                         write_unlock_bh(&bond->curr_slave_lock);
 708                         read_unlock(&bond->lock);
 709                         bond_set_dev_addr(bond->dev, new_active->dev);
 710                         read_lock(&bond->lock);
 711                         write_lock_bh(&bond->curr_slave_lock);
 712                 }
 713                 break;
 714         case BOND_FOM_FOLLOW:
 715                 /*
 716                  * if new_active && old_active, swap them
 717                  * if just old_active, do nothing (going to no active slave)
 718                  * if just new_active, set new_active to bond's MAC
 719                  */
 720                 if (!new_active)
 721                         return;
 722
 723                 write_unlock_bh(&bond->curr_slave_lock);
 724                 read_unlock(&bond->lock);
 725
 726                 if (old_active) {
 727                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 728                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 729                                ETH_ALEN);
 730                         saddr.sa_family = new_active->dev->type;
 731                 } else {
 732                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 733                         saddr.sa_family = bond->dev->type;
 734                 }
 735
 736                 rv = dev_set_mac_address(new_active->dev, &saddr);
 737                 if (rv) {
 738                         pr_err("%s: Error %d setting MAC of slave %s\n",
 739                                bond->dev->name, -rv, new_active->dev->name);
 740                         goto out;
 741                 }
 742
 743                 if (!old_active)
 744                         goto out;
 745
 746                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
 747                 saddr.sa_family = old_active->dev->type;
 748
 749                 rv = dev_set_mac_address(old_active->dev, &saddr);
 750                 if (rv)
 751                         pr_err("%s: Error %d setting MAC of slave %s\n",
 752                                bond->dev->name, -rv, new_active->dev->name);
 753 out:
 754                 read_lock(&bond->lock);
 755                 write_lock_bh(&bond->curr_slave_lock);
 756                 break;
 757         default:
 758                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
 759                        bond->dev->name, bond->params.fail_over_mac);
 760                 break;
 761         }
 762
 763 }
 764
 765 static bool bond_should_change_active(struct bonding *bond)
 766 {
 767         struct slave *prim = bond->primary_slave;
 768         struct slave *curr = bond->curr_active_slave;
 769
 770         if (!prim || !curr || curr->link != BOND_LINK_UP)
 771                 return true;
 772         if (bond->force_primary) {
 773                 bond->force_primary = false;
 774                 return true;
 775         }
 776         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 777             (prim->speed < curr->speed ||
 778              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 779                 return false;
 780         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 781                 return false;
 782         return true;
 783 }
 784
 785 /**
 786  * find_best_interface - select the best available slave to be the active one
 787  * @bond: our bonding struct
 788  */
 789 static struct slave *bond_find_best_slave(struct bonding *bond)
 790 {
 791         struct slave *slave, *bestslave = NULL;
 792         struct list_head *iter;
 793         int mintime = bond->params.updelay;
 794
 795         if (bond->primary_slave && bond->primary_slave->link == BOND_LINK_UP &&
 796             bond_should_change_active(bond))
 797                 return bond->primary_slave;
 798
 799         bond_for_each_slave(bond, slave, iter) {
 800                 if (slave->link == BOND_LINK_UP)
 801                         return slave;
 802                 if (slave->link == BOND_LINK_BACK && IS_UP(slave->dev) &&
 803                     slave->delay < mintime) {
 804                         mintime = slave->delay;
 805                         bestslave = slave;
 806                 }
 807         }
 808
 809         return bestslave;
 810 }
 811
 812 static bool bond_should_notify_peers(struct bonding *bond)
 813 {
 814         struct slave *slave = bond->curr_active_slave;
 815
 816         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
 817                  bond->dev->name, slave ? slave->dev->name : "NULL");
 818
 819         if (!slave || !bond->send_peer_notif ||
 820             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 821                 return false;
 822
 823         return true;
 824 }
 825
 826 /**
 827  * change_active_interface - change the active slave into the specified one
 828  * @bond: our bonding struct
 829  * @new: the new slave to make the active one
 830  *
 831  * Set the new slave to the bond's settings and unset them on the old
 832  * curr_active_slave.
 833  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 834  *
 835  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 836  * because it is apparently the best available slave we have, even though its
 837  * updelay hasn't timed out yet.
 838  *
 839  * If new_active is not NULL, caller must hold bond->lock for read and
 840  * curr_slave_lock for write_bh.
 841  */
 842 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 843 {
 844         struct slave *old_active = bond->curr_active_slave;
 845
 846         if (old_active == new_active)
 847                 return;
 848
 849         if (new_active) {
 850                 new_active->jiffies = jiffies;
 851
 852                 if (new_active->link == BOND_LINK_BACK) {
 853                         if (USES_PRIMARY(bond->params.mode)) {
 854                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
 855                                         bond->dev->name, new_active->dev->name,
 856                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
 857                         }
 858
 859                         new_active->delay = 0;
 860                         new_active->link = BOND_LINK_UP;
 861
 862                         if (bond->params.mode == BOND_MODE_8023AD)
 863                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 864
 865                         if (bond_is_lb(bond))
 866                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 867                 } else {
 868                         if (USES_PRIMARY(bond->params.mode)) {
 869                                 pr_info("%s: making interface %s the new active one.\n",
 870                                         bond->dev->name, new_active->dev->name);
 871                         }
 872                 }
 873         }
 874
 875         if (USES_PRIMARY(bond->params.mode))
 876                 bond_hw_addr_swap(bond, new_active, old_active);
 877
 878         if (bond_is_lb(bond)) {
 879                 bond_alb_handle_active_change(bond, new_active);
 880                 if (old_active)
 881                         bond_set_slave_inactive_flags(old_active);
 882                 if (new_active)
 883                         bond_set_slave_active_flags(new_active);
 884         } else {
 885                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 886         }
 887
 888         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
 889                 if (old_active)
 890                         bond_set_slave_inactive_flags(old_active);
 891
 892                 if (new_active) {
 893                         bool should_notify_peers = false;
 894
 895                         bond_set_slave_active_flags(new_active);
 896
 897                         if (bond->params.fail_over_mac)
 898                                 bond_do_fail_over_mac(bond, new_active,
 899                                                       old_active);
 900
 901                         if (netif_running(bond->dev)) {
 902                                 bond->send_peer_notif =
 903                                         bond->params.num_peer_notif;
 904                                 should_notify_peers =
 905                                         bond_should_notify_peers(bond);
 906                         }
 907
 908                         write_unlock_bh(&bond->curr_slave_lock);
 909                         read_unlock(&bond->lock);
 910
 911                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 912                         if (should_notify_peers)
 913                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 914                                                          bond->dev);
 915
 916                         read_lock(&bond->lock);
 917                         write_lock_bh(&bond->curr_slave_lock);
 918                 }
 919         }
 920
 921         /* resend IGMP joins since active slave has changed or
 922          * all were sent on curr_active_slave.
 923          * resend only if bond is brought up with the affected
 924          * bonding modes and the retransmission is enabled */
 925         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 926             ((USES_PRIMARY(bond->params.mode) && new_active) ||
 927              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
 928                 bond->igmp_retrans = bond->params.resend_igmp;
 929                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 930         }
 931 }
 932
 933 /**
 934  * bond_select_active_slave - select a new active slave, if needed
 935  * @bond: our bonding struct
 936  *
 937  * This functions should be called when one of the following occurs:
 938  * - The old curr_active_slave has been released or lost its link.
 939  * - The primary_slave has got its link back.
 940  * - A slave has got its link back and there's no old curr_active_slave.
 941  *
 942  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
 943  */
 944 void bond_select_active_slave(struct bonding *bond)
 945 {
 946         struct slave *best_slave;
 947         int rv;
 948
 949         best_slave = bond_find_best_slave(bond);
 950         if (best_slave != bond->curr_active_slave) {
 951                 bond_change_active_slave(bond, best_slave);
 952                 rv = bond_set_carrier(bond);
 953                 if (!rv)
 954                         return;
 955
 956                 if (netif_carrier_ok(bond->dev)) {
 957                         pr_info("%s: first active interface up!\n",
 958                                 bond->dev->name);
 959                 } else {
 960                         pr_info("%s: now running without any active interface !\n",
 961                                 bond->dev->name);
 962                 }
 963         }
 964 }
 965
 966 /*--------------------------- slave list handling ---------------------------*/
 967
 968 /*
 969  * This function attaches the slave to the end of list.
 970  *
 971  * bond->lock held for writing by caller.
 972  */
 973 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
 974 {
 975         list_add_tail_rcu(&new_slave->list, &bond->slave_list);
 976         bond->slave_cnt++;
 977 }
 978
 979 /*
 980  * This function detaches the slave from the list.
 981  * WARNING: no check is made to verify if the slave effectively
 982  * belongs to <bond>.
 983  * Nothing is freed on return, structures are just unchained.
 984  * If any slave pointer in bond was pointing to <slave>,
 985  * it should be changed by the calling function.
 986  *
 987  * bond->lock held for writing by caller.
 988  */
 989 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
 990 {
 991         list_del_rcu(&slave->list);
 992         bond->slave_cnt--;
 993 }
 994
 995 #ifdef CONFIG_NET_POLL_CONTROLLER
 996 static inline int slave_enable_netpoll(struct slave *slave)
 997 {
 998         struct netpoll *np;
 999         int err = 0;
1000
1001         np = kzalloc(sizeof(*np), GFP_ATOMIC);
1002         err = -ENOMEM;
1003         if (!np)
1004                 goto out;
1005
1006         err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
1007         if (err) {
1008                 kfree(np);
1009                 goto out;
1010         }
1011         slave->np = np;
1012 out:
1013         return err;
1014 }
1015 static inline void slave_disable_netpoll(struct slave *slave)
1016 {
1017         struct netpoll *np = slave->np;
1018
1019         if (!np)
1020                 return;
1021
1022         slave->np = NULL;
1023         __netpoll_free_async(np);
1024 }
1025 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1026 {
1027         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1028                 return false;
1029         if (!slave_dev->netdev_ops->ndo_poll_controller)
1030                 return false;
1031         return true;
1032 }
1033
1034 static void bond_poll_controller(struct net_device *bond_dev)
1035 {
1036 }
1037
1038 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1039 {
1040         struct bonding *bond = netdev_priv(bond_dev);
1041         struct list_head *iter;
1042         struct slave *slave;
1043
1044         bond_for_each_slave(bond, slave, iter)
1045                 if (IS_UP(slave->dev))
1046                         slave_disable_netpoll(slave);
1047 }
1048
1049 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1050 {
1051         struct bonding *bond = netdev_priv(dev);
1052         struct list_head *iter;
1053         struct slave *slave;
1054         int err = 0;
1055
1056         bond_for_each_slave(bond, slave, iter) {
1057                 err = slave_enable_netpoll(slave);
1058                 if (err) {
1059                         bond_netpoll_cleanup(dev);
1060                         break;
1061                 }
1062         }
1063         return err;
1064 }
1065 #else
1066 static inline int slave_enable_netpoll(struct slave *slave)
1067 {
1068         return 0;
1069 }
1070 static inline void slave_disable_netpoll(struct slave *slave)
1071 {
1072 }
1073 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1074 {
1075 }
1076 #endif
1077
1078 /*---------------------------------- IOCTL ----------------------------------*/
1079
1080 static netdev_features_t bond_fix_features(struct net_device *dev,
1081                                            netdev_features_t features)
1082 {
1083         struct bonding *bond = netdev_priv(dev);
1084         struct list_head *iter;
1085         netdev_features_t mask;
1086         struct slave *slave;
1087
1088         if (list_empty(&bond->slave_list)) {
1089                 /* Disable adding VLANs to empty bond. But why? --mq */
1090                 features |= NETIF_F_VLAN_CHALLENGED;
1091                 return features;
1092         }
1093
1094         mask = features;
1095         features &= ~NETIF_F_ONE_FOR_ALL;
1096         features |= NETIF_F_ALL_FOR_ALL;
1097
1098         bond_for_each_slave(bond, slave, iter) {
1099                 features = netdev_increment_features(features,
1100                                                      slave->dev->features,
1101                                                      mask);
1102         }
1103         features = netdev_add_tso_features(features, mask);
1104
1105         return features;
1106 }
1107
1108 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1109                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1110                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1111
1112 static void bond_compute_features(struct bonding *bond)
1113 {
1114         unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1115         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1116         struct net_device *bond_dev = bond->dev;
1117         struct list_head *iter;
1118         struct slave *slave;
1119         unsigned short max_hard_header_len = ETH_HLEN;
1120         unsigned int gso_max_size = GSO_MAX_SIZE;
1121         u16 gso_max_segs = GSO_MAX_SEGS;
1122
1123         if (list_empty(&bond->slave_list))
1124                 goto done;
1125
1126         bond_for_each_slave(bond, slave, iter) {
1127                 vlan_features = netdev_increment_features(vlan_features,
1128                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1129
1130                 dst_release_flag &= slave->dev->priv_flags;
1131                 if (slave->dev->hard_header_len > max_hard_header_len)
1132                         max_hard_header_len = slave->dev->hard_header_len;
1133
1134                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1135                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1136         }
1137
1138 done:
1139         bond_dev->vlan_features = vlan_features;
1140         bond_dev->hard_header_len = max_hard_header_len;
1141         bond_dev->gso_max_segs = gso_max_segs;
1142         netif_set_gso_max_size(bond_dev, gso_max_size);
1143
1144         flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1145         bond_dev->priv_flags = flags | dst_release_flag;
1146
1147         netdev_change_features(bond_dev);
1148 }
1149
1150 static void bond_setup_by_slave(struct net_device *bond_dev,
1151                                 struct net_device *slave_dev)
1152 {
1153         bond_dev->header_ops        = slave_dev->header_ops;
1154
1155         bond_dev->type              = slave_dev->type;
1156         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1157         bond_dev->addr_len          = slave_dev->addr_len;
1158
1159         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1160                 slave_dev->addr_len);
1161 }
1162
1163 /* On bonding slaves other than the currently active slave, suppress
1164  * duplicates except for alb non-mcast/bcast.
1165  */
1166 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1167                                             struct slave *slave,
1168                                             struct bonding *bond)
1169 {
1170         if (bond_is_slave_inactive(slave)) {
1171                 if (bond->params.mode == BOND_MODE_ALB &&
1172                     skb->pkt_type != PACKET_BROADCAST &&
1173                     skb->pkt_type != PACKET_MULTICAST)
1174                         return false;
1175                 return true;
1176         }
1177         return false;
1178 }
1179
1180 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1181 {
1182         struct sk_buff *skb = *pskb;
1183         struct slave *slave;
1184         struct bonding *bond;
1185         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1186                           struct slave *);
1187         int ret = RX_HANDLER_ANOTHER;
1188
1189         skb = skb_share_check(skb, GFP_ATOMIC);
1190         if (unlikely(!skb))
1191                 return RX_HANDLER_CONSUMED;
1192
1193         *pskb = skb;
1194
1195         slave = bond_slave_get_rcu(skb->dev);
1196         bond = slave->bond;
1197
1198         if (bond->params.arp_interval)
1199                 slave->dev->last_rx = jiffies;
1200
1201         recv_probe = ACCESS_ONCE(bond->recv_probe);
1202         if (recv_probe) {
1203                 ret = recv_probe(skb, bond, slave);
1204                 if (ret == RX_HANDLER_CONSUMED) {
1205                         consume_skb(skb);
1206                         return ret;
1207                 }
1208         }
1209
1210         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1211                 return RX_HANDLER_EXACT;
1212         }
1213
1214         skb->dev = bond->dev;
1215
1216         if (bond->params.mode == BOND_MODE_ALB &&
1217             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1218             skb->pkt_type == PACKET_HOST) {
1219
1220                 if (unlikely(skb_cow_head(skb,
1221                                           skb->data - skb_mac_header(skb)))) {
1222                         kfree_skb(skb);
1223                         return RX_HANDLER_CONSUMED;
1224                 }
1225                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1226         }
1227
1228         return ret;
1229 }
1230
1231 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1232                                       struct net_device *slave_dev,
1233                                       struct slave *slave)
1234 {
1235         int err;
1236
1237         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1238         if (err)
1239                 return err;
1240         slave_dev->flags |= IFF_SLAVE;
1241         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1242         return 0;
1243 }
1244
1245 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1246                                   struct net_device *slave_dev)
1247 {
1248         netdev_upper_dev_unlink(slave_dev, bond_dev);
1249         slave_dev->flags &= ~IFF_SLAVE;
1250         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1251 }
1252
1253 /* enslave device <slave> to bond device <master> */
1254 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1255 {
1256         struct bonding *bond = netdev_priv(bond_dev);
1257         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1258         struct slave *new_slave = NULL;
1259         struct sockaddr addr;
1260         int link_reporting;
1261         int res = 0, i;
1262
1263         if (!bond->params.use_carrier &&
1264             slave_dev->ethtool_ops->get_link == NULL &&
1265             slave_ops->ndo_do_ioctl == NULL) {
1266                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1267                            bond_dev->name, slave_dev->name);
1268         }
1269
1270         /* already enslaved */
1271         if (slave_dev->flags & IFF_SLAVE) {
1272                 pr_debug("Error, Device was already enslaved\n");
1273                 return -EBUSY;
1274         }
1275
1276         /* vlan challenged mutual exclusion */
1277         /* no need to lock since we're protected by rtnl_lock */
1278         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1279                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1280                 if (vlan_uses_dev(bond_dev)) {
1281                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1282                                bond_dev->name, slave_dev->name, bond_dev->name);
1283                         return -EPERM;
1284                 } else {
1285                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1286                                    bond_dev->name, slave_dev->name,
1287                                    slave_dev->name, bond_dev->name);
1288                 }
1289         } else {
1290                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1291         }
1292
1293         /*
1294          * Old ifenslave binaries are no longer supported.  These can
1295          * be identified with moderate accuracy by the state of the slave:
1296          * the current ifenslave will set the interface down prior to
1297          * enslaving it; the old ifenslave will not.
1298          */
1299         if ((slave_dev->flags & IFF_UP)) {
1300                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1301                        slave_dev->name);
1302                 res = -EPERM;
1303                 goto err_undo_flags;
1304         }
1305
1306         /* set bonding device ether type by slave - bonding netdevices are
1307          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1308          * there is a need to override some of the type dependent attribs/funcs.
1309          *
1310          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1311          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1312          */
1313         if (list_empty(&bond->slave_list)) {
1314                 if (bond_dev->type != slave_dev->type) {
1315                         pr_debug("%s: change device type from %d to %d\n",
1316                                  bond_dev->name,
1317                                  bond_dev->type, slave_dev->type);
1318
1319                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1320                                                        bond_dev);
1321                         res = notifier_to_errno(res);
1322                         if (res) {
1323                                 pr_err("%s: refused to change device type\n",
1324                                        bond_dev->name);
1325                                 res = -EBUSY;
1326                                 goto err_undo_flags;
1327                         }
1328
1329                         /* Flush unicast and multicast addresses */
1330                         dev_uc_flush(bond_dev);
1331                         dev_mc_flush(bond_dev);
1332
1333                         if (slave_dev->type != ARPHRD_ETHER)
1334                                 bond_setup_by_slave(bond_dev, slave_dev);
1335                         else {
1336                                 ether_setup(bond_dev);
1337                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1338                         }
1339
1340                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1341                                                  bond_dev);
1342                 }
1343         } else if (bond_dev->type != slave_dev->type) {
1344                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1345                        slave_dev->name,
1346                        slave_dev->type, bond_dev->type);
1347                 res = -EINVAL;
1348                 goto err_undo_flags;
1349         }
1350
1351         if (slave_ops->ndo_set_mac_address == NULL) {
1352                 if (list_empty(&bond->slave_list)) {
1353                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1354                                    bond_dev->name);
1355                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1356                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1357                         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",
1358                                bond_dev->name);
1359                         res = -EOPNOTSUPP;
1360                         goto err_undo_flags;
1361                 }
1362         }
1363
1364         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1365
1366         /* If this is the first slave, then we need to set the master's hardware
1367          * address to be the same as the slave's. */
1368         if (list_empty(&bond->slave_list) &&
1369             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1370                 bond_set_dev_addr(bond->dev, slave_dev);
1371
1372         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1373         if (!new_slave) {
1374                 res = -ENOMEM;
1375                 goto err_undo_flags;
1376         }
1377         INIT_LIST_HEAD(&new_slave->list);
1378         /*
1379          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1380          * is set via sysfs or module option if desired.
1381          */
1382         new_slave->queue_id = 0;
1383
1384         /* Save slave's original mtu and then set it to match the bond */
1385         new_slave->original_mtu = slave_dev->mtu;
1386         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1387         if (res) {
1388                 pr_debug("Error %d calling dev_set_mtu\n", res);
1389                 goto err_free;
1390         }
1391
1392         /*
1393          * Save slave's original ("permanent") mac address for modes
1394          * that need it, and for restoring it upon release, and then
1395          * set it to the master's address
1396          */
1397         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1398
1399         if (!bond->params.fail_over_mac) {
1400                 /*
1401                  * Set slave to master's mac address.  The application already
1402                  * set the master's mac address to that of the first slave
1403                  */
1404                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1405                 addr.sa_family = slave_dev->type;
1406                 res = dev_set_mac_address(slave_dev, &addr);
1407                 if (res) {
1408                         pr_debug("Error %d calling set_mac_address\n", res);
1409                         goto err_restore_mtu;
1410                 }
1411         }
1412
1413         /* open the slave since the application closed it */
1414         res = dev_open(slave_dev);
1415         if (res) {
1416                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1417                 goto err_restore_mac;
1418         }
1419
1420         new_slave->bond = bond;
1421         new_slave->dev = slave_dev;
1422         slave_dev->priv_flags |= IFF_BONDING;
1423
1424         if (bond_is_lb(bond)) {
1425                 /* bond_alb_init_slave() must be called before all other stages since
1426                  * it might fail and we do not want to have to undo everything
1427                  */
1428                 res = bond_alb_init_slave(bond, new_slave);
1429                 if (res)
1430                         goto err_close;
1431         }
1432
1433         /* If the mode USES_PRIMARY, then the following is handled by
1434          * bond_change_active_slave().
1435          */
1436         if (!USES_PRIMARY(bond->params.mode)) {
1437                 /* set promiscuity level to new slave */
1438                 if (bond_dev->flags & IFF_PROMISC) {
1439                         res = dev_set_promiscuity(slave_dev, 1);
1440                         if (res)
1441                                 goto err_close;
1442                 }
1443
1444                 /* set allmulti level to new slave */
1445                 if (bond_dev->flags & IFF_ALLMULTI) {
1446                         res = dev_set_allmulti(slave_dev, 1);
1447                         if (res)
1448                                 goto err_close;
1449                 }
1450
1451                 netif_addr_lock_bh(bond_dev);
1452
1453                 dev_mc_sync_multiple(slave_dev, bond_dev);
1454                 dev_uc_sync_multiple(slave_dev, bond_dev);
1455
1456                 netif_addr_unlock_bh(bond_dev);
1457         }
1458
1459         if (bond->params.mode == BOND_MODE_8023AD) {
1460                 /* add lacpdu mc addr to mc list */
1461                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1462
1463                 dev_mc_add(slave_dev, lacpdu_multicast);
1464         }
1465
1466         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1467         if (res) {
1468                 pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
1469                        bond_dev->name, slave_dev->name);
1470                 goto err_close;
1471         }
1472
1473         write_lock_bh(&bond->lock);
1474
1475         bond_attach_slave(bond, new_slave);
1476
1477         new_slave->delay = 0;
1478         new_slave->link_failure_count = 0;
1479
1480         write_unlock_bh(&bond->lock);
1481
1482         bond_compute_features(bond);
1483
1484         bond_update_speed_duplex(new_slave);
1485
1486         read_lock(&bond->lock);
1487
1488         new_slave->last_arp_rx = jiffies -
1489                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1490         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1491                 new_slave->target_last_arp_rx[i] = new_slave->last_arp_rx;
1492
1493         if (bond->params.miimon && !bond->params.use_carrier) {
1494                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1495
1496                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1497                         /*
1498                          * miimon is set but a bonded network driver
1499                          * does not support ETHTOOL/MII and
1500                          * arp_interval is not set.  Note: if
1501                          * use_carrier is enabled, we will never go
1502                          * here (because netif_carrier is always
1503                          * supported); thus, we don't need to change
1504                          * the messages for netif_carrier.
1505                          */
1506                         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",
1507                                bond_dev->name, slave_dev->name);
1508                 } else if (link_reporting == -1) {
1509                         /* unable get link status using mii/ethtool */
1510                         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",
1511                                    bond_dev->name, slave_dev->name);
1512                 }
1513         }
1514
1515         /* check for initial state */
1516         if (bond->params.miimon) {
1517                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1518                         if (bond->params.updelay) {
1519                                 new_slave->link = BOND_LINK_BACK;
1520                                 new_slave->delay = bond->params.updelay;
1521                         } else {
1522                                 new_slave->link = BOND_LINK_UP;
1523                         }
1524                 } else {
1525                         new_slave->link = BOND_LINK_DOWN;
1526                 }
1527         } else if (bond->params.arp_interval) {
1528                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1529                         BOND_LINK_UP : BOND_LINK_DOWN);
1530         } else {
1531                 new_slave->link = BOND_LINK_UP;
1532         }
1533
1534         if (new_slave->link != BOND_LINK_DOWN)
1535                 new_slave->jiffies = jiffies;
1536         pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1537                 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1538                         (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1539
1540         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1541                 /* if there is a primary slave, remember it */
1542                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1543                         bond->primary_slave = new_slave;
1544                         bond->force_primary = true;
1545                 }
1546         }
1547
1548         write_lock_bh(&bond->curr_slave_lock);
1549
1550         switch (bond->params.mode) {
1551         case BOND_MODE_ACTIVEBACKUP:
1552                 bond_set_slave_inactive_flags(new_slave);
1553                 bond_select_active_slave(bond);
1554                 break;
1555         case BOND_MODE_8023AD:
1556                 /* in 802.3ad mode, the internal mechanism
1557                  * will activate the slaves in the selected
1558                  * aggregator
1559                  */
1560                 bond_set_slave_inactive_flags(new_slave);
1561                 /* if this is the first slave */
1562                 if (bond_first_slave(bond) == new_slave) {
1563                         SLAVE_AD_INFO(new_slave).id = 1;
1564                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1565                          * can be called only after the mac address of the bond is set
1566                          */
1567                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1568                 } else {
1569                         struct slave *prev_slave;
1570
1571                         prev_slave = bond_prev_slave(bond, new_slave);
1572                         SLAVE_AD_INFO(new_slave).id =
1573                                 SLAVE_AD_INFO(prev_slave).id + 1;
1574                 }
1575
1576                 bond_3ad_bind_slave(new_slave);
1577                 break;
1578         case BOND_MODE_TLB:
1579         case BOND_MODE_ALB:
1580                 bond_set_active_slave(new_slave);
1581                 bond_set_slave_inactive_flags(new_slave);
1582                 bond_select_active_slave(bond);
1583                 break;
1584         default:
1585                 pr_debug("This slave is always active in trunk mode\n");
1586
1587                 /* always active in trunk mode */
1588                 bond_set_active_slave(new_slave);
1589
1590                 /* In trunking mode there is little meaning to curr_active_slave
1591                  * anyway (it holds no special properties of the bond device),
1592                  * so we can change it without calling change_active_interface()
1593                  */
1594                 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1595                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1596
1597                 break;
1598         } /* switch(bond_mode) */
1599
1600         write_unlock_bh(&bond->curr_slave_lock);
1601
1602         bond_set_carrier(bond);
1603
1604 #ifdef CONFIG_NET_POLL_CONTROLLER
1605         slave_dev->npinfo = bond->dev->npinfo;
1606         if (slave_dev->npinfo) {
1607                 if (slave_enable_netpoll(new_slave)) {
1608                         read_unlock(&bond->lock);
1609                         pr_info("Error, %s: master_dev is using netpoll, "
1610                                  "but new slave device does not support netpoll.\n",
1611                                  bond_dev->name);
1612                         res = -EBUSY;
1613                         goto err_detach;
1614                 }
1615         }
1616 #endif
1617
1618         read_unlock(&bond->lock);
1619
1620         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1621         if (res)
1622                 goto err_detach;
1623
1624         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1625                                          new_slave);
1626         if (res) {
1627                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1628                 goto err_dest_symlinks;
1629         }
1630
1631         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1632         if (res) {
1633                 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1634                 goto err_unregister;
1635         }
1636
1637
1638         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1639                 bond_dev->name, slave_dev->name,
1640                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1641                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1642
1643         /* enslave is successful */
1644         return 0;
1645
1646 /* Undo stages on error */
1647 err_unregister:
1648         netdev_rx_handler_unregister(slave_dev);
1649
1650 err_dest_symlinks:
1651         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1652
1653 err_detach:
1654         if (!USES_PRIMARY(bond->params.mode))
1655                 bond_hw_addr_flush(bond_dev, slave_dev);
1656
1657         vlan_vids_del_by_dev(slave_dev, bond_dev);
1658         write_lock_bh(&bond->lock);
1659         bond_detach_slave(bond, new_slave);
1660         if (bond->primary_slave == new_slave)
1661                 bond->primary_slave = NULL;
1662         if (bond->curr_active_slave == new_slave) {
1663                 bond_change_active_slave(bond, NULL);
1664                 write_unlock_bh(&bond->lock);
1665                 read_lock(&bond->lock);
1666                 write_lock_bh(&bond->curr_slave_lock);
1667                 bond_select_active_slave(bond);
1668                 write_unlock_bh(&bond->curr_slave_lock);
1669                 read_unlock(&bond->lock);
1670         } else {
1671                 write_unlock_bh(&bond->lock);
1672         }
1673         slave_disable_netpoll(new_slave);
1674
1675 err_close:
1676         slave_dev->priv_flags &= ~IFF_BONDING;
1677         dev_close(slave_dev);
1678
1679 err_restore_mac:
1680         if (!bond->params.fail_over_mac) {
1681                 /* XXX TODO - fom follow mode needs to change master's
1682                  * MAC if this slave's MAC is in use by the bond, or at
1683                  * least print a warning.
1684                  */
1685                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1686                 addr.sa_family = slave_dev->type;
1687                 dev_set_mac_address(slave_dev, &addr);
1688         }
1689
1690 err_restore_mtu:
1691         dev_set_mtu(slave_dev, new_slave->original_mtu);
1692
1693 err_free:
1694         kfree(new_slave);
1695
1696 err_undo_flags:
1697         bond_compute_features(bond);
1698         /* Enslave of first slave has failed and we need to fix master's mac */
1699         if (list_empty(&bond->slave_list) &&
1700             ether_addr_equal(bond_dev->dev_addr, slave_dev->dev_addr))
1701                 eth_hw_addr_random(bond_dev);
1702
1703         return res;
1704 }
1705
1706 /*
1707  * Try to release the slave device <slave> from the bond device <master>
1708  * It is legal to access curr_active_slave without a lock because all the function
1709  * is write-locked. If "all" is true it means that the function is being called
1710  * while destroying a bond interface and all slaves are being released.
1711  *
1712  * The rules for slave state should be:
1713  *   for Active/Backup:
1714  *     Active stays on all backups go down
1715  *   for Bonded connections:
1716  *     The first up interface should be left on and all others downed.
1717  */
1718 static int __bond_release_one(struct net_device *bond_dev,
1719                               struct net_device *slave_dev,
1720                               bool all)
1721 {
1722         struct bonding *bond = netdev_priv(bond_dev);
1723         struct slave *slave, *oldcurrent;
1724         struct sockaddr addr;
1725         netdev_features_t old_features = bond_dev->features;
1726
1727         /* slave is not a slave or master is not master of this slave */
1728         if (!(slave_dev->flags & IFF_SLAVE) ||
1729             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1730                 pr_err("%s: Error: cannot release %s.\n",
1731                        bond_dev->name, slave_dev->name);
1732                 return -EINVAL;
1733         }
1734
1735         block_netpoll_tx();
1736         write_lock_bh(&bond->lock);
1737
1738         slave = bond_get_slave_by_dev(bond, slave_dev);
1739         if (!slave) {
1740                 /* not a slave of this bond */
1741                 pr_info("%s: %s not enslaved\n",
1742                         bond_dev->name, slave_dev->name);
1743                 write_unlock_bh(&bond->lock);
1744                 unblock_netpoll_tx();
1745                 return -EINVAL;
1746         }
1747
1748         write_unlock_bh(&bond->lock);
1749
1750         bond_upper_dev_unlink(bond_dev, slave_dev);
1751         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1752          * for this slave anymore.
1753          */
1754         netdev_rx_handler_unregister(slave_dev);
1755         write_lock_bh(&bond->lock);
1756
1757         /* Inform AD package of unbinding of slave. */
1758         if (bond->params.mode == BOND_MODE_8023AD) {
1759                 /* must be called before the slave is
1760                  * detached from the list
1761                  */
1762                 bond_3ad_unbind_slave(slave);
1763         }
1764
1765         pr_info("%s: releasing %s interface %s\n",
1766                 bond_dev->name,
1767                 bond_is_active_slave(slave) ? "active" : "backup",
1768                 slave_dev->name);
1769
1770         oldcurrent = bond->curr_active_slave;
1771
1772         bond->current_arp_slave = NULL;
1773
1774         /* release the slave from its bond */
1775         bond_detach_slave(bond, slave);
1776
1777         if (!all && !bond->params.fail_over_mac) {
1778                 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
1779                     !list_empty(&bond->slave_list))
1780                         pr_warn("%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",
1781                                    bond_dev->name, slave_dev->name,
1782                                    slave->perm_hwaddr,
1783                                    bond_dev->name, slave_dev->name);
1784         }
1785
1786         if (bond->primary_slave == slave)
1787                 bond->primary_slave = NULL;
1788
1789         if (oldcurrent == slave)
1790                 bond_change_active_slave(bond, NULL);
1791
1792         if (bond_is_lb(bond)) {
1793                 /* Must be called only after the slave has been
1794                  * detached from the list and the curr_active_slave
1795                  * has been cleared (if our_slave == old_current),
1796                  * but before a new active slave is selected.
1797                  */
1798                 write_unlock_bh(&bond->lock);
1799                 bond_alb_deinit_slave(bond, slave);
1800                 write_lock_bh(&bond->lock);
1801         }
1802
1803         if (all) {
1804                 rcu_assign_pointer(bond->curr_active_slave, NULL);
1805         } else if (oldcurrent == slave) {
1806                 /*
1807                  * Note that we hold RTNL over this sequence, so there
1808                  * is no concern that another slave add/remove event
1809                  * will interfere.
1810                  */
1811                 write_unlock_bh(&bond->lock);
1812                 read_lock(&bond->lock);
1813                 write_lock_bh(&bond->curr_slave_lock);
1814
1815                 bond_select_active_slave(bond);
1816
1817                 write_unlock_bh(&bond->curr_slave_lock);
1818                 read_unlock(&bond->lock);
1819                 write_lock_bh(&bond->lock);
1820         }
1821
1822         if (list_empty(&bond->slave_list)) {
1823                 bond_set_carrier(bond);
1824                 eth_hw_addr_random(bond_dev);
1825
1826                 if (vlan_uses_dev(bond_dev)) {
1827                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1828                                    bond_dev->name, bond_dev->name);
1829                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1830                                    bond_dev->name);
1831                 }
1832         }
1833
1834         write_unlock_bh(&bond->lock);
1835         unblock_netpoll_tx();
1836         synchronize_rcu();
1837
1838         if (list_empty(&bond->slave_list)) {
1839                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1840                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1841         }
1842
1843         bond_compute_features(bond);
1844         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1845             (old_features & NETIF_F_VLAN_CHALLENGED))
1846                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1847                         bond_dev->name, slave_dev->name, bond_dev->name);
1848
1849         /* must do this from outside any spinlocks */
1850         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1851
1852         vlan_vids_del_by_dev(slave_dev, bond_dev);
1853
1854         /* If the mode USES_PRIMARY, then this cases was handled above by
1855          * bond_change_active_slave(..., NULL)
1856          */
1857         if (!USES_PRIMARY(bond->params.mode)) {
1858                 /* unset promiscuity level from slave */
1859                 if (bond_dev->flags & IFF_PROMISC)
1860                         dev_set_promiscuity(slave_dev, -1);
1861
1862                 /* unset allmulti level from slave */
1863                 if (bond_dev->flags & IFF_ALLMULTI)
1864                         dev_set_allmulti(slave_dev, -1);
1865
1866                 bond_hw_addr_flush(bond_dev, slave_dev);
1867         }
1868
1869         slave_disable_netpoll(slave);
1870
1871         /* close slave before restoring its mac address */
1872         dev_close(slave_dev);
1873
1874         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1875                 /* restore original ("permanent") mac address */
1876                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1877                 addr.sa_family = slave_dev->type;
1878                 dev_set_mac_address(slave_dev, &addr);
1879         }
1880
1881         dev_set_mtu(slave_dev, slave->original_mtu);
1882
1883         slave_dev->priv_flags &= ~IFF_BONDING;
1884
1885         kfree(slave);
1886
1887         return 0;  /* deletion OK */
1888 }
1889
1890 /* A wrapper used because of ndo_del_link */
1891 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1892 {
1893         return __bond_release_one(bond_dev, slave_dev, false);
1894 }
1895
1896 /*
1897 * First release a slave and then destroy the bond if no more slaves are left.
1898 * Must be under rtnl_lock when this function is called.
1899 */
1900 static int  bond_release_and_destroy(struct net_device *bond_dev,
1901                                      struct net_device *slave_dev)
1902 {
1903         struct bonding *bond = netdev_priv(bond_dev);
1904         int ret;
1905
1906         ret = bond_release(bond_dev, slave_dev);
1907         if (ret == 0 && list_empty(&bond->slave_list)) {
1908                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1909                 pr_info("%s: destroying bond %s.\n",
1910                         bond_dev->name, bond_dev->name);
1911                 unregister_netdevice(bond_dev);
1912         }
1913         return ret;
1914 }
1915
1916 /*
1917  * This function changes the active slave to slave <slave_dev>.
1918  * It returns -EINVAL in the following cases.
1919  *  - <slave_dev> is not found in the list.
1920  *  - There is not active slave now.
1921  *  - <slave_dev> is already active.
1922  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1923  *  - <slave_dev> is not running.
1924  * In these cases, this function does nothing.
1925  * In the other cases, current_slave pointer is changed and 0 is returned.
1926  */
1927 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1928 {
1929         struct bonding *bond = netdev_priv(bond_dev);
1930         struct slave *old_active = NULL;
1931         struct slave *new_active = NULL;
1932         int res = 0;
1933
1934         if (!USES_PRIMARY(bond->params.mode))
1935                 return -EINVAL;
1936
1937         /* Verify that bond_dev is indeed the master of slave_dev */
1938         if (!(slave_dev->flags & IFF_SLAVE) ||
1939             !netdev_has_upper_dev(slave_dev, bond_dev))
1940                 return -EINVAL;
1941
1942         read_lock(&bond->lock);
1943
1944         old_active = bond->curr_active_slave;
1945         new_active = bond_get_slave_by_dev(bond, slave_dev);
1946         /*
1947          * Changing to the current active: do nothing; return success.
1948          */
1949         if (new_active && new_active == old_active) {
1950                 read_unlock(&bond->lock);
1951                 return 0;
1952         }
1953
1954         if (new_active &&
1955             old_active &&
1956             new_active->link == BOND_LINK_UP &&
1957             IS_UP(new_active->dev)) {
1958                 block_netpoll_tx();
1959                 write_lock_bh(&bond->curr_slave_lock);
1960                 bond_change_active_slave(bond, new_active);
1961                 write_unlock_bh(&bond->curr_slave_lock);
1962                 unblock_netpoll_tx();
1963         } else
1964                 res = -EINVAL;
1965
1966         read_unlock(&bond->lock);
1967
1968         return res;
1969 }
1970
1971 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1972 {
1973         struct bonding *bond = netdev_priv(bond_dev);
1974
1975         info->bond_mode = bond->params.mode;
1976         info->miimon = bond->params.miimon;
1977
1978         read_lock(&bond->lock);
1979         info->num_slaves = bond->slave_cnt;
1980         read_unlock(&bond->lock);
1981
1982         return 0;
1983 }
1984
1985 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1986 {
1987         struct bonding *bond = netdev_priv(bond_dev);
1988         struct list_head *iter;
1989         int i = 0, res = -ENODEV;
1990         struct slave *slave;
1991
1992         read_lock(&bond->lock);
1993         bond_for_each_slave(bond, slave, iter) {
1994                 if (i++ == (int)info->slave_id) {
1995                         res = 0;
1996                         strcpy(info->slave_name, slave->dev->name);
1997                         info->link = slave->link;
1998                         info->state = bond_slave_state(slave);
1999                         info->link_failure_count = slave->link_failure_count;
2000                         break;
2001                 }
2002         }
2003         read_unlock(&bond->lock);
2004
2005         return res;
2006 }
2007
2008 /*-------------------------------- Monitoring -------------------------------*/
2009
2010
2011 static int bond_miimon_inspect(struct bonding *bond)
2012 {
2013         int link_state, commit = 0;
2014         struct list_head *iter;
2015         struct slave *slave;
2016         bool ignore_updelay;
2017
2018         ignore_updelay = !bond->curr_active_slave ? true : false;
2019
2020         bond_for_each_slave(bond, slave, iter) {
2021                 slave->new_link = BOND_LINK_NOCHANGE;
2022
2023                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2024
2025                 switch (slave->link) {
2026                 case BOND_LINK_UP:
2027                         if (link_state)
2028                                 continue;
2029
2030                         slave->link = BOND_LINK_FAIL;
2031                         slave->delay = bond->params.downdelay;
2032                         if (slave->delay) {
2033                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2034                                         bond->dev->name,
2035                                         (bond->params.mode ==
2036                                          BOND_MODE_ACTIVEBACKUP) ?
2037                                         (bond_is_active_slave(slave) ?
2038                                          "active " : "backup ") : "",
2039                                         slave->dev->name,
2040                                         bond->params.downdelay * bond->params.miimon);
2041                         }
2042                         /*FALLTHRU*/
2043                 case BOND_LINK_FAIL:
2044                         if (link_state) {
2045                                 /*
2046                                  * recovered before downdelay expired
2047                                  */
2048                                 slave->link = BOND_LINK_UP;
2049                                 slave->jiffies = jiffies;
2050                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2051                                         bond->dev->name,
2052                                         (bond->params.downdelay - slave->delay) *
2053                                         bond->params.miimon,
2054                                         slave->dev->name);
2055                                 continue;
2056                         }
2057
2058                         if (slave->delay <= 0) {
2059                                 slave->new_link = BOND_LINK_DOWN;
2060                                 commit++;
2061                                 continue;
2062                         }
2063
2064                         slave->delay--;
2065                         break;
2066
2067                 case BOND_LINK_DOWN:
2068                         if (!link_state)
2069                                 continue;
2070
2071                         slave->link = BOND_LINK_BACK;
2072                         slave->delay = bond->params.updelay;
2073
2074                         if (slave->delay) {
2075                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2076                                         bond->dev->name, slave->dev->name,
2077                                         ignore_updelay ? 0 :
2078                                         bond->params.updelay *
2079                                         bond->params.miimon);
2080                         }
2081                         /*FALLTHRU*/
2082                 case BOND_LINK_BACK:
2083                         if (!link_state) {
2084                                 slave->link = BOND_LINK_DOWN;
2085                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2086                                         bond->dev->name,
2087                                         (bond->params.updelay - slave->delay) *
2088                                         bond->params.miimon,
2089                                         slave->dev->name);
2090
2091                                 continue;
2092                         }
2093
2094                         if (ignore_updelay)
2095                                 slave->delay = 0;
2096
2097                         if (slave->delay <= 0) {
2098                                 slave->new_link = BOND_LINK_UP;
2099                                 commit++;
2100                                 ignore_updelay = false;
2101                                 continue;
2102                         }
2103
2104                         slave->delay--;
2105                         break;
2106                 }
2107         }
2108
2109         return commit;
2110 }
2111
2112 static void bond_miimon_commit(struct bonding *bond)
2113 {
2114         struct list_head *iter;
2115         struct slave *slave;
2116
2117         bond_for_each_slave(bond, slave, iter) {
2118                 switch (slave->new_link) {
2119                 case BOND_LINK_NOCHANGE:
2120                         continue;
2121
2122                 case BOND_LINK_UP:
2123                         slave->link = BOND_LINK_UP;
2124                         slave->jiffies = jiffies;
2125
2126                         if (bond->params.mode == BOND_MODE_8023AD) {
2127                                 /* prevent it from being the active one */
2128                                 bond_set_backup_slave(slave);
2129                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2130                                 /* make it immediately active */
2131                                 bond_set_active_slave(slave);
2132                         } else if (slave != bond->primary_slave) {
2133                                 /* prevent it from being the active one */
2134                                 bond_set_backup_slave(slave);
2135                         }
2136
2137                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2138                                 bond->dev->name, slave->dev->name,
2139                                 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2140                                 slave->duplex ? "full" : "half");
2141
2142                         /* notify ad that the link status has changed */
2143                         if (bond->params.mode == BOND_MODE_8023AD)
2144                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2145
2146                         if (bond_is_lb(bond))
2147                                 bond_alb_handle_link_change(bond, slave,
2148                                                             BOND_LINK_UP);
2149
2150                         if (!bond->curr_active_slave ||
2151                             (slave == bond->primary_slave))
2152                                 goto do_failover;
2153
2154                         continue;
2155
2156                 case BOND_LINK_DOWN:
2157                         if (slave->link_failure_count < UINT_MAX)
2158                                 slave->link_failure_count++;
2159
2160                         slave->link = BOND_LINK_DOWN;
2161
2162                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2163                             bond->params.mode == BOND_MODE_8023AD)
2164                                 bond_set_slave_inactive_flags(slave);
2165
2166                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2167                                 bond->dev->name, slave->dev->name);
2168
2169                         if (bond->params.mode == BOND_MODE_8023AD)
2170                                 bond_3ad_handle_link_change(slave,
2171                                                             BOND_LINK_DOWN);
2172
2173                         if (bond_is_lb(bond))
2174                                 bond_alb_handle_link_change(bond, slave,
2175                                                             BOND_LINK_DOWN);
2176
2177                         if (slave == bond->curr_active_slave)
2178                                 goto do_failover;
2179
2180                         continue;
2181
2182                 default:
2183                         pr_err("%s: invalid new link %d on slave %s\n",
2184                                bond->dev->name, slave->new_link,
2185                                slave->dev->name);
2186                         slave->new_link = BOND_LINK_NOCHANGE;
2187
2188                         continue;
2189                 }
2190
2191 do_failover:
2192                 ASSERT_RTNL();
2193                 block_netpoll_tx();
2194                 write_lock_bh(&bond->curr_slave_lock);
2195                 bond_select_active_slave(bond);
2196                 write_unlock_bh(&bond->curr_slave_lock);
2197                 unblock_netpoll_tx();
2198         }
2199
2200         bond_set_carrier(bond);
2201 }
2202
2203 /*
2204  * bond_mii_monitor
2205  *
2206  * Really a wrapper that splits the mii monitor into two phases: an
2207  * inspection, then (if inspection indicates something needs to be done)
2208  * an acquisition of appropriate locks followed by a commit phase to
2209  * implement whatever link state changes are indicated.
2210  */
2211 void bond_mii_monitor(struct work_struct *work)
2212 {
2213         struct bonding *bond = container_of(work, struct bonding,
2214                                             mii_work.work);
2215         bool should_notify_peers = false;
2216         unsigned long delay;
2217
2218         read_lock(&bond->lock);
2219
2220         delay = msecs_to_jiffies(bond->params.miimon);
2221
2222         if (list_empty(&bond->slave_list))
2223                 goto re_arm;
2224
2225         should_notify_peers = bond_should_notify_peers(bond);
2226
2227         if (bond_miimon_inspect(bond)) {
2228                 read_unlock(&bond->lock);
2229
2230                 /* Race avoidance with bond_close cancel of workqueue */
2231                 if (!rtnl_trylock()) {
2232                         read_lock(&bond->lock);
2233                         delay = 1;
2234                         should_notify_peers = false;
2235                         goto re_arm;
2236                 }
2237
2238                 read_lock(&bond->lock);
2239
2240                 bond_miimon_commit(bond);
2241
2242                 read_unlock(&bond->lock);
2243                 rtnl_unlock();  /* might sleep, hold no other locks */
2244                 read_lock(&bond->lock);
2245         }
2246
2247 re_arm:
2248         if (bond->params.miimon)
2249                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2250
2251         read_unlock(&bond->lock);
2252
2253         if (should_notify_peers) {
2254                 if (!rtnl_trylock())
2255                         return;
2256                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2257                 rtnl_unlock();
2258         }
2259 }
2260
2261 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2262 {
2263         struct net_device *upper;
2264         struct list_head *iter;
2265         bool ret = false;
2266
2267         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2268                 return true;
2269
2270         rcu_read_lock();
2271         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2272                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2273                         ret = true;
2274                         break;
2275                 }
2276         }
2277         rcu_read_unlock();
2278
2279         return ret;
2280 }
2281
2282 /*
2283  * We go to the (large) trouble of VLAN tagging ARP frames because
2284  * switches in VLAN mode (especially if ports are configured as
2285  * "native" to a VLAN) might not pass non-tagged frames.
2286  */
2287 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2288 {
2289         struct sk_buff *skb;
2290
2291         pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2292                  slave_dev->name, &dest_ip, &src_ip, vlan_id);
2293
2294         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2295                          NULL, slave_dev->dev_addr, NULL);
2296
2297         if (!skb) {
2298                 pr_err("ARP packet allocation failed\n");
2299                 return;
2300         }
2301         if (vlan_id) {
2302                 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2303                 if (!skb) {
2304                         pr_err("failed to insert VLAN tag\n");
2305                         return;
2306                 }
2307         }
2308         arp_xmit(skb);
2309 }
2310
2311
2312 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2313 {
2314         struct net_device *upper, *vlan_upper;
2315         struct list_head *iter, *vlan_iter;
2316         struct rtable *rt;
2317         __be32 *targets = bond->params.arp_targets, addr;
2318         int i, vlan_id;
2319
2320         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2321                 pr_debug("basa: target %pI4\n", &targets[i]);
2322
2323                 /* Find out through which dev should the packet go */
2324                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2325                                      RTO_ONLINK, 0);
2326                 if (IS_ERR(rt)) {
2327                         pr_debug("%s: no route to arp_ip_target %pI4\n",
2328                                  bond->dev->name, &targets[i]);
2329                         continue;
2330                 }
2331
2332                 vlan_id = 0;
2333
2334                 /* bond device itself */
2335                 if (rt->dst.dev == bond->dev)
2336                         goto found;
2337
2338                 rcu_read_lock();
2339                 /* first we search only for vlan devices. for every vlan
2340                  * found we verify its upper dev list, searching for the
2341                  * rt->dst.dev. If found we save the tag of the vlan and
2342                  * proceed to send the packet.
2343                  *
2344                  * TODO: QinQ?
2345                  */
2346                 netdev_for_each_all_upper_dev_rcu(bond->dev, vlan_upper,
2347                                                   vlan_iter) {
2348                         if (!is_vlan_dev(vlan_upper))
2349                                 continue;
2350                         netdev_for_each_all_upper_dev_rcu(vlan_upper, upper,
2351                                                           iter) {
2352                                 if (upper == rt->dst.dev) {
2353                                         vlan_id = vlan_dev_vlan_id(vlan_upper);
2354                                         rcu_read_unlock();
2355                                         goto found;
2356                                 }
2357                         }
2358                 }
2359
2360                 /* if the device we're looking for is not on top of any of
2361                  * our upper vlans, then just search for any dev that
2362                  * matches, and in case it's a vlan - save the id
2363                  */
2364                 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2365                         if (upper == rt->dst.dev) {
2366                                 /* if it's a vlan - get its VID */
2367                                 if (is_vlan_dev(upper))
2368                                         vlan_id = vlan_dev_vlan_id(upper);
2369
2370                                 rcu_read_unlock();
2371                                 goto found;
2372                         }
2373                 }
2374                 rcu_read_unlock();
2375
2376                 /* Not our device - skip */
2377                 pr_debug("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2378                          bond->dev->name, &targets[i],
2379                          rt->dst.dev ? rt->dst.dev->name : "NULL");
2380
2381                 ip_rt_put(rt);
2382                 continue;
2383
2384 found:
2385                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2386                 ip_rt_put(rt);
2387                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2388                               addr, vlan_id);
2389         }
2390 }
2391
2392 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2393 {
2394         int i;
2395
2396         if (!sip || !bond_has_this_ip(bond, tip)) {
2397                 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2398                 return;
2399         }
2400
2401         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2402         if (i == -1) {
2403                 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2404                 return;
2405         }
2406         slave->last_arp_rx = jiffies;
2407         slave->target_last_arp_rx[i] = jiffies;
2408 }
2409
2410 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2411                  struct slave *slave)
2412 {
2413         struct arphdr *arp = (struct arphdr *)skb->data;
2414         unsigned char *arp_ptr;
2415         __be32 sip, tip;
2416         int alen;
2417
2418         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2419                 return RX_HANDLER_ANOTHER;
2420
2421         read_lock(&bond->lock);
2422
2423         if (!slave_do_arp_validate(bond, slave))
2424                 goto out_unlock;
2425
2426         alen = arp_hdr_len(bond->dev);
2427
2428         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2429                  bond->dev->name, skb->dev->name);
2430
2431         if (alen > skb_headlen(skb)) {
2432                 arp = kmalloc(alen, GFP_ATOMIC);
2433                 if (!arp)
2434                         goto out_unlock;
2435                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2436                         goto out_unlock;
2437         }
2438
2439         if (arp->ar_hln != bond->dev->addr_len ||
2440             skb->pkt_type == PACKET_OTHERHOST ||
2441             skb->pkt_type == PACKET_LOOPBACK ||
2442             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2443             arp->ar_pro != htons(ETH_P_IP) ||
2444             arp->ar_pln != 4)
2445                 goto out_unlock;
2446
2447         arp_ptr = (unsigned char *)(arp + 1);
2448         arp_ptr += bond->dev->addr_len;
2449         memcpy(&sip, arp_ptr, 4);
2450         arp_ptr += 4 + bond->dev->addr_len;
2451         memcpy(&tip, arp_ptr, 4);
2452
2453         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2454                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2455                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2456                  &sip, &tip);
2457
2458         /*
2459          * Backup slaves won't see the ARP reply, but do come through
2460          * here for each ARP probe (so we swap the sip/tip to validate
2461          * the probe).  In a "redundant switch, common router" type of
2462          * configuration, the ARP probe will (hopefully) travel from
2463          * the active, through one switch, the router, then the other
2464          * switch before reaching the backup.
2465          *
2466          * We 'trust' the arp requests if there is an active slave and
2467          * it received valid arp reply(s) after it became active. This
2468          * is done to avoid endless looping when we can't reach the
2469          * arp_ip_target and fool ourselves with our own arp requests.
2470          */
2471         if (bond_is_active_slave(slave))
2472                 bond_validate_arp(bond, slave, sip, tip);
2473         else if (bond->curr_active_slave &&
2474                  time_after(slave_last_rx(bond, bond->curr_active_slave),
2475                             bond->curr_active_slave->jiffies))
2476                 bond_validate_arp(bond, slave, tip, sip);
2477
2478 out_unlock:
2479         read_unlock(&bond->lock);
2480         if (arp != (struct arphdr *)skb->data)
2481                 kfree(arp);
2482         return RX_HANDLER_ANOTHER;
2483 }
2484
2485 /* function to verify if we're in the arp_interval timeslice, returns true if
2486  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2487  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2488  */
2489 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2490                                   int mod)
2491 {
2492         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2493
2494         return time_in_range(jiffies,
2495                              last_act - delta_in_ticks,
2496                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2497 }
2498
2499 /*
2500  * this function is called regularly to monitor each slave's link
2501  * ensuring that traffic is being sent and received when arp monitoring
2502  * is used in load-balancing mode. if the adapter has been dormant, then an
2503  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2504  * arp monitoring in active backup mode.
2505  */
2506 void bond_loadbalance_arp_mon(struct work_struct *work)
2507 {
2508         struct bonding *bond = container_of(work, struct bonding,
2509                                             arp_work.work);
2510         struct slave *slave, *oldcurrent;
2511         struct list_head *iter;
2512         int do_failover = 0;
2513
2514         read_lock(&bond->lock);
2515
2516         if (list_empty(&bond->slave_list))
2517                 goto re_arm;
2518
2519         oldcurrent = bond->curr_active_slave;
2520         /* see if any of the previous devices are up now (i.e. they have
2521          * xmt and rcv traffic). the curr_active_slave does not come into
2522          * the picture unless it is null. also, slave->jiffies is not needed
2523          * here because we send an arp on each slave and give a slave as
2524          * long as it needs to get the tx/rx within the delta.
2525          * TODO: what about up/down delay in arp mode? it wasn't here before
2526          *       so it can wait
2527          */
2528         bond_for_each_slave(bond, slave, iter) {
2529                 unsigned long trans_start = dev_trans_start(slave->dev);
2530
2531                 if (slave->link != BOND_LINK_UP) {
2532                         if (bond_time_in_interval(bond, trans_start, 1) &&
2533                             bond_time_in_interval(bond, slave->dev->last_rx, 1)) {
2534
2535                                 slave->link  = BOND_LINK_UP;
2536                                 bond_set_active_slave(slave);
2537
2538                                 /* primary_slave has no meaning in round-robin
2539                                  * mode. the window of a slave being up and
2540                                  * curr_active_slave being null after enslaving
2541                                  * is closed.
2542                                  */
2543                                 if (!oldcurrent) {
2544                                         pr_info("%s: link status definitely up for interface %s, ",
2545                                                 bond->dev->name,
2546                                                 slave->dev->name);
2547                                         do_failover = 1;
2548                                 } else {
2549                                         pr_info("%s: interface %s is now up\n",
2550                                                 bond->dev->name,
2551                                                 slave->dev->name);
2552                                 }
2553                         }
2554                 } else {
2555                         /* slave->link == BOND_LINK_UP */
2556
2557                         /* not all switches will respond to an arp request
2558                          * when the source ip is 0, so don't take the link down
2559                          * if we don't know our ip yet
2560                          */
2561                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2562                             !bond_time_in_interval(bond, slave->dev->last_rx, 2)) {
2563
2564                                 slave->link  = BOND_LINK_DOWN;
2565                                 bond_set_backup_slave(slave);
2566
2567                                 if (slave->link_failure_count < UINT_MAX)
2568                                         slave->link_failure_count++;
2569
2570                                 pr_info("%s: interface %s is now down.\n",
2571                                         bond->dev->name,
2572                                         slave->dev->name);
2573
2574                                 if (slave == oldcurrent)
2575                                         do_failover = 1;
2576                         }
2577                 }
2578
2579                 /* note: if switch is in round-robin mode, all links
2580                  * must tx arp to ensure all links rx an arp - otherwise
2581                  * links may oscillate or not come up at all; if switch is
2582                  * in something like xor mode, there is nothing we can
2583                  * do - all replies will be rx'ed on same link causing slaves
2584                  * to be unstable during low/no traffic periods
2585                  */
2586                 if (IS_UP(slave->dev))
2587                         bond_arp_send_all(bond, slave);
2588         }
2589
2590         if (do_failover) {
2591                 block_netpoll_tx();
2592                 write_lock_bh(&bond->curr_slave_lock);
2593
2594                 bond_select_active_slave(bond);
2595
2596                 write_unlock_bh(&bond->curr_slave_lock);
2597                 unblock_netpoll_tx();
2598         }
2599
2600 re_arm:
2601         if (bond->params.arp_interval)
2602                 queue_delayed_work(bond->wq, &bond->arp_work,
2603                                    msecs_to_jiffies(bond->params.arp_interval));
2604
2605         read_unlock(&bond->lock);
2606 }
2607
2608 /*
2609  * Called to inspect slaves for active-backup mode ARP monitor link state
2610  * changes.  Sets new_link in slaves to specify what action should take
2611  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2612  * to link states must be committed.
2613  *
2614  * Called with bond->lock held for read.
2615  */
2616 static int bond_ab_arp_inspect(struct bonding *bond)
2617 {
2618         unsigned long trans_start, last_rx;
2619         struct list_head *iter;
2620         struct slave *slave;
2621         int commit = 0;
2622
2623         bond_for_each_slave(bond, slave, iter) {
2624                 slave->new_link = BOND_LINK_NOCHANGE;
2625                 last_rx = slave_last_rx(bond, slave);
2626
2627                 if (slave->link != BOND_LINK_UP) {
2628                         if (bond_time_in_interval(bond, last_rx, 1)) {
2629                                 slave->new_link = BOND_LINK_UP;
2630                                 commit++;
2631                         }
2632                         continue;
2633                 }
2634
2635                 /*
2636                  * Give slaves 2*delta after being enslaved or made
2637                  * active.  This avoids bouncing, as the last receive
2638                  * times need a full ARP monitor cycle to be updated.
2639                  */
2640                 if (bond_time_in_interval(bond, slave->jiffies, 2))
2641                         continue;
2642
2643                 /*
2644                  * Backup slave is down if:
2645                  * - No current_arp_slave AND
2646                  * - more than 3*delta since last receive AND
2647                  * - the bond has an IP address
2648                  *
2649                  * Note: a non-null current_arp_slave indicates
2650                  * the curr_active_slave went down and we are
2651                  * searching for a new one; under this condition
2652                  * we only take the curr_active_slave down - this
2653                  * gives each slave a chance to tx/rx traffic
2654                  * before being taken out
2655                  */
2656                 if (!bond_is_active_slave(slave) &&
2657                     !bond->current_arp_slave &&
2658                     !bond_time_in_interval(bond, last_rx, 3)) {
2659                         slave->new_link = BOND_LINK_DOWN;
2660                         commit++;
2661                 }
2662
2663                 /*
2664                  * Active slave is down if:
2665                  * - more than 2*delta since transmitting OR
2666                  * - (more than 2*delta since receive AND
2667                  *    the bond has an IP address)
2668                  */
2669                 trans_start = dev_trans_start(slave->dev);
2670                 if (bond_is_active_slave(slave) &&
2671                     (!bond_time_in_interval(bond, trans_start, 2) ||
2672                      !bond_time_in_interval(bond, last_rx, 2))) {
2673                         slave->new_link = BOND_LINK_DOWN;
2674                         commit++;
2675                 }
2676         }
2677
2678         return commit;
2679 }
2680
2681 /*
2682  * Called to commit link state changes noted by inspection step of
2683  * active-backup mode ARP monitor.
2684  *
2685  * Called with RTNL and bond->lock for read.
2686  */
2687 static void bond_ab_arp_commit(struct bonding *bond)
2688 {
2689         unsigned long trans_start;
2690         struct list_head *iter;
2691         struct slave *slave;
2692
2693         bond_for_each_slave(bond, slave, iter) {
2694                 switch (slave->new_link) {
2695                 case BOND_LINK_NOCHANGE:
2696                         continue;
2697
2698                 case BOND_LINK_UP:
2699                         trans_start = dev_trans_start(slave->dev);
2700                         if (bond->curr_active_slave != slave ||
2701                             (!bond->curr_active_slave &&
2702                              bond_time_in_interval(bond, trans_start, 1))) {
2703                                 slave->link = BOND_LINK_UP;
2704                                 if (bond->current_arp_slave) {
2705                                         bond_set_slave_inactive_flags(
2706                                                 bond->current_arp_slave);
2707                                         bond->current_arp_slave = NULL;
2708                                 }
2709
2710                                 pr_info("%s: link status definitely up for interface %s.\n",
2711                                         bond->dev->name, slave->dev->name);
2712
2713                                 if (!bond->curr_active_slave ||
2714                                     (slave == bond->primary_slave))
2715                                         goto do_failover;
2716
2717                         }
2718
2719                         continue;
2720
2721                 case BOND_LINK_DOWN:
2722                         if (slave->link_failure_count < UINT_MAX)
2723                                 slave->link_failure_count++;
2724
2725                         slave->link = BOND_LINK_DOWN;
2726                         bond_set_slave_inactive_flags(slave);
2727
2728                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2729                                 bond->dev->name, slave->dev->name);
2730
2731                         if (slave == bond->curr_active_slave) {
2732                                 bond->current_arp_slave = NULL;
2733                                 goto do_failover;
2734                         }
2735
2736                         continue;
2737
2738                 default:
2739                         pr_err("%s: impossible: new_link %d on slave %s\n",
2740                                bond->dev->name, slave->new_link,
2741                                slave->dev->name);
2742                         continue;
2743                 }
2744
2745 do_failover:
2746                 ASSERT_RTNL();
2747                 block_netpoll_tx();
2748                 write_lock_bh(&bond->curr_slave_lock);
2749                 bond_select_active_slave(bond);
2750                 write_unlock_bh(&bond->curr_slave_lock);
2751                 unblock_netpoll_tx();
2752         }
2753
2754         bond_set_carrier(bond);
2755 }
2756
2757 /*
2758  * Send ARP probes for active-backup mode ARP monitor.
2759  *
2760  * Called with bond->lock held for read.
2761  */
2762 static void bond_ab_arp_probe(struct bonding *bond)
2763 {
2764         struct slave *slave, *before = NULL, *new_slave = NULL;
2765         struct list_head *iter;
2766         bool found = false;
2767
2768         read_lock(&bond->curr_slave_lock);
2769
2770         if (bond->current_arp_slave && bond->curr_active_slave)
2771                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2772                         bond->current_arp_slave->dev->name,
2773                         bond->curr_active_slave->dev->name);
2774
2775         if (bond->curr_active_slave) {
2776                 bond_arp_send_all(bond, bond->curr_active_slave);
2777                 read_unlock(&bond->curr_slave_lock);
2778                 return;
2779         }
2780
2781         read_unlock(&bond->curr_slave_lock);
2782
2783         /* if we don't have a curr_active_slave, search for the next available
2784          * backup slave from the current_arp_slave and make it the candidate
2785          * for becoming the curr_active_slave
2786          */
2787
2788         if (!bond->current_arp_slave) {
2789                 bond->current_arp_slave = bond_first_slave(bond);
2790                 if (!bond->current_arp_slave)
2791                         return;
2792         }
2793
2794         bond_set_slave_inactive_flags(bond->current_arp_slave);
2795
2796         bond_for_each_slave(bond, slave, iter) {
2797                 if (!found && !before && IS_UP(slave->dev))
2798                         before = slave;
2799
2800                 if (found && !new_slave && IS_UP(slave->dev))
2801                         new_slave = slave;
2802                 /* if the link state is up at this point, we
2803                  * mark it down - this can happen if we have
2804                  * simultaneous link failures and
2805                  * reselect_active_interface doesn't make this
2806                  * one the current slave so it is still marked
2807                  * up when it is actually down
2808                  */
2809                 if (!IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
2810                         slave->link = BOND_LINK_DOWN;
2811                         if (slave->link_failure_count < UINT_MAX)
2812                                 slave->link_failure_count++;
2813
2814                         bond_set_slave_inactive_flags(slave);
2815
2816                         pr_info("%s: backup interface %s is now down.\n",
2817                                 bond->dev->name, slave->dev->name);
2818                 }
2819                 if (slave == bond->current_arp_slave)
2820                         found = true;
2821         }
2822
2823         if (!new_slave && before)
2824                 new_slave = before;
2825
2826         if (!new_slave)
2827                 return;
2828
2829         new_slave->link = BOND_LINK_BACK;
2830         bond_set_slave_active_flags(new_slave);
2831         bond_arp_send_all(bond, new_slave);
2832         new_slave->jiffies = jiffies;
2833         bond->current_arp_slave = new_slave;
2834
2835 }
2836
2837 void bond_activebackup_arp_mon(struct work_struct *work)
2838 {
2839         struct bonding *bond = container_of(work, struct bonding,
2840                                             arp_work.work);
2841         bool should_notify_peers = false;
2842         int delta_in_ticks;
2843
2844         read_lock(&bond->lock);
2845
2846         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2847
2848         if (list_empty(&bond->slave_list))
2849                 goto re_arm;
2850
2851         should_notify_peers = bond_should_notify_peers(bond);
2852
2853         if (bond_ab_arp_inspect(bond)) {
2854                 read_unlock(&bond->lock);
2855
2856                 /* Race avoidance with bond_close flush of workqueue */
2857                 if (!rtnl_trylock()) {
2858                         read_lock(&bond->lock);
2859                         delta_in_ticks = 1;
2860                         should_notify_peers = false;
2861                         goto re_arm;
2862                 }
2863
2864                 read_lock(&bond->lock);
2865
2866                 bond_ab_arp_commit(bond);
2867
2868                 read_unlock(&bond->lock);
2869                 rtnl_unlock();
2870                 read_lock(&bond->lock);
2871         }
2872
2873         bond_ab_arp_probe(bond);
2874
2875 re_arm:
2876         if (bond->params.arp_interval)
2877                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2878
2879         read_unlock(&bond->lock);
2880
2881         if (should_notify_peers) {
2882                 if (!rtnl_trylock())
2883                         return;
2884                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2885                 rtnl_unlock();
2886         }
2887 }
2888
2889 /*-------------------------- netdev event handling --------------------------*/
2890
2891 /*
2892  * Change device name
2893  */
2894 static int bond_event_changename(struct bonding *bond)
2895 {
2896         bond_remove_proc_entry(bond);
2897         bond_create_proc_entry(bond);
2898
2899         bond_debug_reregister(bond);
2900
2901         return NOTIFY_DONE;
2902 }
2903
2904 static int bond_master_netdev_event(unsigned long event,
2905                                     struct net_device *bond_dev)
2906 {
2907         struct bonding *event_bond = netdev_priv(bond_dev);
2908
2909         switch (event) {
2910         case NETDEV_CHANGENAME:
2911                 return bond_event_changename(event_bond);
2912         case NETDEV_UNREGISTER:
2913                 bond_remove_proc_entry(event_bond);
2914                 break;
2915         case NETDEV_REGISTER:
2916                 bond_create_proc_entry(event_bond);
2917                 break;
2918         case NETDEV_NOTIFY_PEERS:
2919                 if (event_bond->send_peer_notif)
2920                         event_bond->send_peer_notif--;
2921                 break;
2922         default:
2923                 break;
2924         }
2925
2926         return NOTIFY_DONE;
2927 }
2928
2929 static int bond_slave_netdev_event(unsigned long event,
2930                                    struct net_device *slave_dev)
2931 {
2932         struct slave *slave = bond_slave_get_rtnl(slave_dev);
2933         struct bonding *bond;
2934         struct net_device *bond_dev;
2935         u32 old_speed;
2936         u8 old_duplex;
2937
2938         /* A netdev event can be generated while enslaving a device
2939          * before netdev_rx_handler_register is called in which case
2940          * slave will be NULL
2941          */
2942         if (!slave)
2943                 return NOTIFY_DONE;
2944         bond_dev = slave->bond->dev;
2945         bond = slave->bond;
2946
2947         switch (event) {
2948         case NETDEV_UNREGISTER:
2949                 if (bond_dev->type != ARPHRD_ETHER)
2950                         bond_release_and_destroy(bond_dev, slave_dev);
2951                 else
2952                         bond_release(bond_dev, slave_dev);
2953                 break;
2954         case NETDEV_UP:
2955         case NETDEV_CHANGE:
2956                 old_speed = slave->speed;
2957                 old_duplex = slave->duplex;
2958
2959                 bond_update_speed_duplex(slave);
2960
2961                 if (bond->params.mode == BOND_MODE_8023AD) {
2962                         if (old_speed != slave->speed)
2963                                 bond_3ad_adapter_speed_changed(slave);
2964                         if (old_duplex != slave->duplex)
2965                                 bond_3ad_adapter_duplex_changed(slave);
2966                 }
2967                 break;
2968         case NETDEV_DOWN:
2969                 /*
2970                  * ... Or is it this?
2971                  */
2972                 break;
2973         case NETDEV_CHANGEMTU:
2974                 /*
2975                  * TODO: Should slaves be allowed to
2976                  * independently alter their MTU?  For
2977                  * an active-backup bond, slaves need
2978                  * not be the same type of device, so
2979                  * MTUs may vary.  For other modes,
2980                  * slaves arguably should have the
2981                  * same MTUs. To do this, we'd need to
2982                  * take over the slave's change_mtu
2983                  * function for the duration of their
2984                  * servitude.
2985                  */
2986                 break;
2987         case NETDEV_CHANGENAME:
2988                 /*
2989                  * TODO: handle changing the primary's name
2990                  */
2991                 break;
2992         case NETDEV_FEAT_CHANGE:
2993                 bond_compute_features(bond);
2994                 break;
2995         case NETDEV_RESEND_IGMP:
2996                 /* Propagate to master device */
2997                 call_netdevice_notifiers(event, slave->bond->dev);
2998                 break;
2999         default:
3000                 break;
3001         }
3002
3003         return NOTIFY_DONE;
3004 }
3005
3006 /*
3007  * bond_netdev_event: handle netdev notifier chain events.
3008  *
3009  * This function receives events for the netdev chain.  The caller (an
3010  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3011  * locks for us to safely manipulate the slave devices (RTNL lock,
3012  * dev_probe_lock).
3013  */
3014 static int bond_netdev_event(struct notifier_block *this,
3015                              unsigned long event, void *ptr)
3016 {
3017         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3018
3019         pr_debug("event_dev: %s, event: %lx\n",
3020                  event_dev ? event_dev->name : "None",
3021                  event);
3022
3023         if (!(event_dev->priv_flags & IFF_BONDING))
3024                 return NOTIFY_DONE;
3025
3026         if (event_dev->flags & IFF_MASTER) {
3027                 pr_debug("IFF_MASTER\n");
3028                 return bond_master_netdev_event(event, event_dev);
3029         }
3030
3031         if (event_dev->flags & IFF_SLAVE) {
3032                 pr_debug("IFF_SLAVE\n");
3033                 return bond_slave_netdev_event(event, event_dev);
3034         }
3035
3036         return NOTIFY_DONE;
3037 }
3038
3039 static struct notifier_block bond_netdev_notifier = {
3040         .notifier_call = bond_netdev_event,
3041 };
3042
3043 /*---------------------------- Hashing Policies -----------------------------*/
3044
3045 /*
3046  * Hash for the output device based upon layer 2 data
3047  */
3048 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3049 {
3050         struct ethhdr *data = (struct ethhdr *)skb->data;
3051
3052         if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
3053                 return (data->h_dest[5] ^ data->h_source[5]) % count;
3054
3055         return 0;
3056 }
3057
3058 /*
3059  * Hash for the output device based upon layer 2 and layer 3 data. If
3060  * the packet is not IP, fall back on bond_xmit_hash_policy_l2()
3061  */
3062 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3063 {
3064         const struct ethhdr *data;
3065         const struct iphdr *iph;
3066         const struct ipv6hdr *ipv6h;
3067         u32 v6hash;
3068         const __be32 *s, *d;
3069
3070         if (skb->protocol == htons(ETH_P_IP) &&
3071             pskb_network_may_pull(skb, sizeof(*iph))) {
3072                 iph = ip_hdr(skb);
3073                 data = (struct ethhdr *)skb->data;
3074                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3075                         (data->h_dest[5] ^ data->h_source[5])) % count;
3076         } else if (skb->protocol == htons(ETH_P_IPV6) &&
3077                    pskb_network_may_pull(skb, sizeof(*ipv6h))) {
3078                 ipv6h = ipv6_hdr(skb);
3079                 data = (struct ethhdr *)skb->data;
3080                 s = &ipv6h->saddr.s6_addr32[0];
3081                 d = &ipv6h->daddr.s6_addr32[0];
3082                 v6hash = (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3083                 v6hash ^= (v6hash >> 24) ^ (v6hash >> 16) ^ (v6hash >> 8);
3084                 return (v6hash ^ data->h_dest[5] ^ data->h_source[5]) % count;
3085         }
3086
3087         return bond_xmit_hash_policy_l2(skb, count);
3088 }
3089
3090 /*
3091  * Hash for the output device based upon layer 3 and layer 4 data. If
3092  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3093  * altogether not IP, fall back on bond_xmit_hash_policy_l2()
3094  */
3095 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3096 {
3097         u32 layer4_xor = 0;
3098         const struct iphdr *iph;
3099         const struct ipv6hdr *ipv6h;
3100         const __be32 *s, *d;
3101         const __be16 *l4 = NULL;
3102         __be16 _l4[2];
3103         int noff = skb_network_offset(skb);
3104         int poff;
3105
3106         if (skb->protocol == htons(ETH_P_IP) &&
3107             pskb_may_pull(skb, noff + sizeof(*iph))) {
3108                 iph = ip_hdr(skb);
3109                 poff = proto_ports_offset(iph->protocol);
3110
3111                 if (!ip_is_fragment(iph) && poff >= 0) {
3112                         l4 = skb_header_pointer(skb, noff + (iph->ihl << 2) + poff,
3113                                                 sizeof(_l4), &_l4);
3114                         if (l4)
3115                                 layer4_xor = ntohs(l4[0] ^ l4[1]);
3116                 }
3117                 return (layer4_xor ^
3118                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3119         } else if (skb->protocol == htons(ETH_P_IPV6) &&
3120                    pskb_may_pull(skb, noff + sizeof(*ipv6h))) {
3121                 ipv6h = ipv6_hdr(skb);
3122                 poff = proto_ports_offset(ipv6h->nexthdr);
3123                 if (poff >= 0) {
3124                         l4 = skb_header_pointer(skb, noff + sizeof(*ipv6h) + poff,
3125                                                 sizeof(_l4), &_l4);
3126                         if (l4)
3127                                 layer4_xor = ntohs(l4[0] ^ l4[1]);
3128                 }
3129                 s = &ipv6h->saddr.s6_addr32[0];
3130                 d = &ipv6h->daddr.s6_addr32[0];
3131                 layer4_xor ^= (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3132                 layer4_xor ^= (layer4_xor >> 24) ^ (layer4_xor >> 16) ^
3133                                (layer4_xor >> 8);
3134                 return layer4_xor % count;
3135         }
3136
3137         return bond_xmit_hash_policy_l2(skb, count);
3138 }
3139
3140 /*-------------------------- Device entry points ----------------------------*/
3141
3142 static void bond_work_init_all(struct bonding *bond)
3143 {
3144         INIT_DELAYED_WORK(&bond->mcast_work,
3145                           bond_resend_igmp_join_requests_delayed);
3146         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3147         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3148         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3149                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3150         else
3151                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3152         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3153 }
3154
3155 static void bond_work_cancel_all(struct bonding *bond)
3156 {
3157         cancel_delayed_work_sync(&bond->mii_work);
3158         cancel_delayed_work_sync(&bond->arp_work);
3159         cancel_delayed_work_sync(&bond->alb_work);
3160         cancel_delayed_work_sync(&bond->ad_work);
3161         cancel_delayed_work_sync(&bond->mcast_work);
3162 }
3163
3164 static int bond_open(struct net_device *bond_dev)
3165 {
3166         struct bonding *bond = netdev_priv(bond_dev);
3167         struct list_head *iter;
3168         struct slave *slave;
3169
3170         /* reset slave->backup and slave->inactive */
3171         read_lock(&bond->lock);
3172         if (!list_empty(&bond->slave_list)) {
3173                 read_lock(&bond->curr_slave_lock);
3174                 bond_for_each_slave(bond, slave, iter) {
3175                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3176                                 && (slave != bond->curr_active_slave)) {
3177                                 bond_set_slave_inactive_flags(slave);
3178                         } else {
3179                                 bond_set_slave_active_flags(slave);
3180                         }
3181                 }
3182                 read_unlock(&bond->curr_slave_lock);
3183         }
3184         read_unlock(&bond->lock);
3185
3186         bond_work_init_all(bond);
3187
3188         if (bond_is_lb(bond)) {
3189                 /* bond_alb_initialize must be called before the timer
3190                  * is started.
3191                  */
3192                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3193                         return -ENOMEM;
3194                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3195         }
3196
3197         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3198                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3199
3200         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3201                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3202                 if (bond->params.arp_validate)
3203                         bond->recv_probe = bond_arp_rcv;
3204         }
3205
3206         if (bond->params.mode == BOND_MODE_8023AD) {
3207                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3208                 /* register to receive LACPDUs */
3209                 bond->recv_probe = bond_3ad_lacpdu_recv;
3210                 bond_3ad_initiate_agg_selection(bond, 1);
3211         }
3212
3213         return 0;
3214 }
3215
3216 static int bond_close(struct net_device *bond_dev)
3217 {
3218         struct bonding *bond = netdev_priv(bond_dev);
3219
3220         bond_work_cancel_all(bond);
3221         bond->send_peer_notif = 0;
3222         if (bond_is_lb(bond))
3223                 bond_alb_deinitialize(bond);
3224         bond->recv_probe = NULL;
3225
3226         return 0;
3227 }
3228
3229 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3230                                                 struct rtnl_link_stats64 *stats)
3231 {
3232         struct bonding *bond = netdev_priv(bond_dev);
3233         struct rtnl_link_stats64 temp;
3234         struct list_head *iter;
3235         struct slave *slave;
3236
3237         memset(stats, 0, sizeof(*stats));
3238
3239         read_lock_bh(&bond->lock);
3240         bond_for_each_slave(bond, slave, iter) {
3241                 const struct rtnl_link_stats64 *sstats =
3242                         dev_get_stats(slave->dev, &temp);
3243
3244                 stats->rx_packets += sstats->rx_packets;
3245                 stats->rx_bytes += sstats->rx_bytes;
3246                 stats->rx_errors += sstats->rx_errors;
3247                 stats->rx_dropped += sstats->rx_dropped;
3248
3249                 stats->tx_packets += sstats->tx_packets;
3250                 stats->tx_bytes += sstats->tx_bytes;
3251                 stats->tx_errors += sstats->tx_errors;
3252                 stats->tx_dropped += sstats->tx_dropped;
3253
3254                 stats->multicast += sstats->multicast;
3255                 stats->collisions += sstats->collisions;
3256
3257                 stats->rx_length_errors += sstats->rx_length_errors;
3258                 stats->rx_over_errors += sstats->rx_over_errors;
3259                 stats->rx_crc_errors += sstats->rx_crc_errors;
3260                 stats->rx_frame_errors += sstats->rx_frame_errors;
3261                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3262                 stats->rx_missed_errors += sstats->rx_missed_errors;
3263
3264                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3265                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3266                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3267                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3268                 stats->tx_window_errors += sstats->tx_window_errors;
3269         }
3270         read_unlock_bh(&bond->lock);
3271
3272         return stats;
3273 }
3274
3275 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3276 {
3277         struct net_device *slave_dev = NULL;
3278         struct ifbond k_binfo;
3279         struct ifbond __user *u_binfo = NULL;
3280         struct ifslave k_sinfo;
3281         struct ifslave __user *u_sinfo = NULL;
3282         struct mii_ioctl_data *mii = NULL;
3283         struct net *net;
3284         int res = 0;
3285
3286         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3287
3288         switch (cmd) {
3289         case SIOCGMIIPHY:
3290                 mii = if_mii(ifr);
3291                 if (!mii)
3292                         return -EINVAL;
3293
3294                 mii->phy_id = 0;
3295                 /* Fall Through */
3296         case SIOCGMIIREG:
3297                 /*
3298                  * We do this again just in case we were called by SIOCGMIIREG
3299                  * instead of SIOCGMIIPHY.
3300                  */
3301                 mii = if_mii(ifr);
3302                 if (!mii)
3303                         return -EINVAL;
3304
3305
3306                 if (mii->reg_num == 1) {
3307                         struct bonding *bond = netdev_priv(bond_dev);
3308                         mii->val_out = 0;
3309                         read_lock(&bond->lock);
3310                         read_lock(&bond->curr_slave_lock);
3311                         if (netif_carrier_ok(bond->dev))
3312                                 mii->val_out = BMSR_LSTATUS;
3313
3314                         read_unlock(&bond->curr_slave_lock);
3315                         read_unlock(&bond->lock);
3316                 }
3317
3318                 return 0;
3319         case BOND_INFO_QUERY_OLD:
3320         case SIOCBONDINFOQUERY:
3321                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3322
3323                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3324                         return -EFAULT;
3325
3326                 res = bond_info_query(bond_dev, &k_binfo);
3327                 if (res == 0 &&
3328                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3329                         return -EFAULT;
3330
3331                 return res;
3332         case BOND_SLAVE_INFO_QUERY_OLD:
3333         case SIOCBONDSLAVEINFOQUERY:
3334                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3335
3336                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3337                         return -EFAULT;
3338
3339                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3340                 if (res == 0 &&
3341                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3342                         return -EFAULT;
3343
3344                 return res;
3345         default:
3346                 /* Go on */
3347                 break;
3348         }
3349
3350         net = dev_net(bond_dev);
3351
3352         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3353                 return -EPERM;
3354
3355         slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3356
3357         pr_debug("slave_dev=%p:\n", slave_dev);
3358
3359         if (!slave_dev)
3360                 res = -ENODEV;
3361         else {
3362                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3363                 switch (cmd) {
3364                 case BOND_ENSLAVE_OLD:
3365                 case SIOCBONDENSLAVE:
3366                         res = bond_enslave(bond_dev, slave_dev);
3367                         break;
3368                 case BOND_RELEASE_OLD:
3369                 case SIOCBONDRELEASE:
3370                         res = bond_release(bond_dev, slave_dev);
3371                         break;
3372                 case BOND_SETHWADDR_OLD:
3373                 case SIOCBONDSETHWADDR:
3374                         bond_set_dev_addr(bond_dev, slave_dev);
3375                         res = 0;
3376                         break;
3377                 case BOND_CHANGE_ACTIVE_OLD:
3378                 case SIOCBONDCHANGEACTIVE:
3379                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3380                         break;
3381                 default:
3382                         res = -EOPNOTSUPP;
3383                 }
3384
3385                 dev_put(slave_dev);
3386         }
3387
3388         return res;
3389 }
3390
3391 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3392 {
3393         struct bonding *bond = netdev_priv(bond_dev);
3394
3395         if (change & IFF_PROMISC)
3396                 bond_set_promiscuity(bond,
3397                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3398
3399         if (change & IFF_ALLMULTI)
3400                 bond_set_allmulti(bond,
3401                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3402 }
3403
3404 static void bond_set_rx_mode(struct net_device *bond_dev)
3405 {
3406         struct bonding *bond = netdev_priv(bond_dev);
3407         struct list_head *iter;
3408         struct slave *slave;
3409
3410         ASSERT_RTNL();
3411
3412         if (USES_PRIMARY(bond->params.mode)) {
3413                 slave = rtnl_dereference(bond->curr_active_slave);
3414                 if (slave) {
3415                         dev_uc_sync(slave->dev, bond_dev);
3416                         dev_mc_sync(slave->dev, bond_dev);
3417                 }
3418         } else {
3419                 bond_for_each_slave(bond, slave, iter) {
3420                         dev_uc_sync_multiple(slave->dev, bond_dev);
3421                         dev_mc_sync_multiple(slave->dev, bond_dev);
3422                 }
3423         }
3424 }
3425
3426 static int bond_neigh_init(struct neighbour *n)
3427 {
3428         struct bonding *bond = netdev_priv(n->dev);
3429         const struct net_device_ops *slave_ops;
3430         struct neigh_parms parms;
3431         struct slave *slave;
3432         int ret;
3433
3434         slave = bond_first_slave(bond);
3435         if (!slave)
3436                 return 0;
3437         slave_ops = slave->dev->netdev_ops;
3438         if (!slave_ops->ndo_neigh_setup)
3439                 return 0;
3440
3441         parms.neigh_setup = NULL;
3442         parms.neigh_cleanup = NULL;
3443         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3444         if (ret)
3445                 return ret;
3446
3447         /*
3448          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3449          * after the last slave has been detached.  Assumes that all slaves
3450          * utilize the same neigh_cleanup (true at this writing as only user
3451          * is ipoib).
3452          */
3453         n->parms->neigh_cleanup = parms.neigh_cleanup;
3454
3455         if (!parms.neigh_setup)
3456                 return 0;
3457
3458         return parms.neigh_setup(n);
3459 }
3460
3461 /*
3462  * The bonding ndo_neigh_setup is called at init time beofre any
3463  * slave exists. So we must declare proxy setup function which will
3464  * be used at run time to resolve the actual slave neigh param setup.
3465  *
3466  * It's also called by master devices (such as vlans) to setup their
3467  * underlying devices. In that case - do nothing, we're already set up from
3468  * our init.
3469  */
3470 static int bond_neigh_setup(struct net_device *dev,
3471                             struct neigh_parms *parms)
3472 {
3473         /* modify only our neigh_parms */
3474         if (parms->dev == dev)
3475                 parms->neigh_setup = bond_neigh_init;
3476
3477         return 0;
3478 }
3479
3480 /*
3481  * Change the MTU of all of a master's slaves to match the master
3482  */
3483 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3484 {
3485         struct bonding *bond = netdev_priv(bond_dev);
3486         struct slave *slave, *rollback_slave;
3487         struct list_head *iter;
3488         int res = 0;
3489
3490         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3491                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3492
3493         /* Can't hold bond->lock with bh disabled here since
3494          * some base drivers panic. On the other hand we can't
3495          * hold bond->lock without bh disabled because we'll
3496          * deadlock. The only solution is to rely on the fact
3497          * that we're under rtnl_lock here, and the slaves
3498          * list won't change. This doesn't solve the problem
3499          * of setting the slave's MTU while it is
3500          * transmitting, but the assumption is that the base
3501          * driver can handle that.
3502          *
3503          * TODO: figure out a way to safely iterate the slaves
3504          * list, but without holding a lock around the actual
3505          * call to the base driver.
3506          */
3507
3508         bond_for_each_slave(bond, slave, iter) {
3509                 pr_debug("s %p s->p %p c_m %p\n",
3510                          slave,
3511                          bond_prev_slave(bond, slave),
3512                          slave->dev->netdev_ops->ndo_change_mtu);
3513
3514                 res = dev_set_mtu(slave->dev, new_mtu);
3515
3516                 if (res) {
3517                         /* If we failed to set the slave's mtu to the new value
3518                          * we must abort the operation even in ACTIVE_BACKUP
3519                          * mode, because if we allow the backup slaves to have
3520                          * different mtu values than the active slave we'll
3521                          * need to change their mtu when doing a failover. That
3522                          * means changing their mtu from timer context, which
3523                          * is probably not a good idea.
3524                          */
3525                         pr_debug("err %d %s\n", res, slave->dev->name);
3526                         goto unwind;
3527                 }
3528         }
3529
3530         bond_dev->mtu = new_mtu;
3531
3532         return 0;
3533
3534 unwind:
3535         /* unwind from head to the slave that failed */
3536         bond_for_each_slave(bond, rollback_slave, iter) {
3537                 int tmp_res;
3538
3539                 if (rollback_slave == slave)
3540                         break;
3541
3542                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3543                 if (tmp_res) {
3544                         pr_debug("unwind err %d dev %s\n",
3545                                  tmp_res, rollback_slave->dev->name);
3546                 }
3547         }
3548
3549         return res;
3550 }
3551
3552 /*
3553  * Change HW address
3554  *
3555  * Note that many devices must be down to change the HW address, and
3556  * downing the master releases all slaves.  We can make bonds full of
3557  * bonding devices to test this, however.
3558  */
3559 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3560 {
3561         struct bonding *bond = netdev_priv(bond_dev);
3562         struct slave *slave, *rollback_slave;
3563         struct sockaddr *sa = addr, tmp_sa;
3564         struct list_head *iter;
3565         int res = 0;
3566
3567         if (bond->params.mode == BOND_MODE_ALB)
3568                 return bond_alb_set_mac_address(bond_dev, addr);
3569
3570
3571         pr_debug("bond=%p, name=%s\n",
3572                  bond, bond_dev ? bond_dev->name : "None");
3573
3574         /* If fail_over_mac is enabled, do nothing and return success.
3575          * Returning an error causes ifenslave to fail.
3576          */
3577         if (bond->params.fail_over_mac)
3578                 return 0;
3579
3580         if (!is_valid_ether_addr(sa->sa_data))
3581                 return -EADDRNOTAVAIL;
3582
3583         /* Can't hold bond->lock with bh disabled here since
3584          * some base drivers panic. On the other hand we can't
3585          * hold bond->lock without bh disabled because we'll
3586          * deadlock. The only solution is to rely on the fact
3587          * that we're under rtnl_lock here, and the slaves
3588          * list won't change. This doesn't solve the problem
3589          * of setting the slave's hw address while it is
3590          * transmitting, but the assumption is that the base
3591          * driver can handle that.
3592          *
3593          * TODO: figure out a way to safely iterate the slaves
3594          * list, but without holding a lock around the actual
3595          * call to the base driver.
3596          */
3597
3598         bond_for_each_slave(bond, slave, iter) {
3599                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3600                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3601
3602                 if (slave_ops->ndo_set_mac_address == NULL) {
3603                         res = -EOPNOTSUPP;
3604                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3605                         goto unwind;
3606                 }
3607
3608                 res = dev_set_mac_address(slave->dev, addr);
3609                 if (res) {
3610                         /* TODO: consider downing the slave
3611                          * and retry ?
3612                          * User should expect communications
3613                          * breakage anyway until ARP finish
3614                          * updating, so...
3615                          */
3616                         pr_debug("err %d %s\n", res, slave->dev->name);
3617                         goto unwind;
3618                 }
3619         }
3620
3621         /* success */
3622         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3623         return 0;
3624
3625 unwind:
3626         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3627         tmp_sa.sa_family = bond_dev->type;
3628
3629         /* unwind from head to the slave that failed */
3630         bond_for_each_slave(bond, rollback_slave, iter) {
3631                 int tmp_res;
3632
3633                 if (rollback_slave == slave)
3634                         break;
3635
3636                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3637                 if (tmp_res) {
3638                         pr_debug("unwind err %d dev %s\n",
3639                                  tmp_res, rollback_slave->dev->name);
3640                 }
3641         }
3642
3643         return res;
3644 }
3645
3646 /**
3647  * bond_xmit_slave_id - transmit skb through slave with slave_id
3648  * @bond: bonding device that is transmitting
3649  * @skb: buffer to transmit
3650  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3651  *
3652  * This function tries to transmit through slave with slave_id but in case
3653  * it fails, it tries to find the first available slave for transmission.
3654  * The skb is consumed in all cases, thus the function is void.
3655  */
3656 void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3657 {
3658         struct list_head *iter;
3659         struct slave *slave;
3660         int i = slave_id;
3661
3662         /* Here we start from the slave with slave_id */
3663         bond_for_each_slave_rcu(bond, slave, iter) {
3664                 if (--i < 0) {
3665                         if (slave_can_tx(slave)) {
3666                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3667                                 return;
3668                         }
3669                 }
3670         }
3671
3672         /* Here we start from the first slave up to slave_id */
3673         i = slave_id;
3674         bond_for_each_slave_rcu(bond, slave, iter) {
3675                 if (--i < 0)
3676                         break;
3677                 if (slave_can_tx(slave)) {
3678                         bond_dev_queue_xmit(bond, skb, slave->dev);
3679                         return;
3680                 }
3681         }
3682         /* no slave that can tx has been found */
3683         kfree_skb(skb);
3684 }
3685
3686 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3687 {
3688         struct bonding *bond = netdev_priv(bond_dev);
3689         struct iphdr *iph = ip_hdr(skb);
3690         struct slave *slave;
3691
3692         /*
3693          * Start with the curr_active_slave that joined the bond as the
3694          * default for sending IGMP traffic.  For failover purposes one
3695          * needs to maintain some consistency for the interface that will
3696          * send the join/membership reports.  The curr_active_slave found
3697          * will send all of this type of traffic.
3698          */
3699         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3700                 slave = rcu_dereference(bond->curr_active_slave);
3701                 if (slave && slave_can_tx(slave))
3702                         bond_dev_queue_xmit(bond, skb, slave->dev);
3703                 else
3704                         bond_xmit_slave_id(bond, skb, 0);
3705         } else {
3706                 bond_xmit_slave_id(bond, skb,
3707                                    bond->rr_tx_counter++ % bond->slave_cnt);
3708         }
3709
3710         return NETDEV_TX_OK;
3711 }
3712
3713 /*
3714  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3715  * the bond has a usable interface.
3716  */
3717 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3718 {
3719         struct bonding *bond = netdev_priv(bond_dev);
3720         struct slave *slave;
3721
3722         slave = rcu_dereference(bond->curr_active_slave);
3723         if (slave)
3724                 bond_dev_queue_xmit(bond, skb, slave->dev);
3725         else
3726                 kfree_skb(skb);
3727
3728         return NETDEV_TX_OK;
3729 }
3730
3731 /*
3732  * In bond_xmit_xor() , we determine the output device by using a pre-
3733  * determined xmit_hash_policy(), If the selected device is not enabled,
3734  * find the next active slave.
3735  */
3736 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3737 {
3738         struct bonding *bond = netdev_priv(bond_dev);
3739
3740         bond_xmit_slave_id(bond, skb,
3741                            bond->xmit_hash_policy(skb, bond->slave_cnt));
3742
3743         return NETDEV_TX_OK;
3744 }
3745
3746 /* in broadcast mode, we send everything to all usable interfaces. */
3747 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3748 {
3749         struct bonding *bond = netdev_priv(bond_dev);
3750         struct slave *slave = NULL;
3751         struct list_head *iter;
3752
3753         bond_for_each_slave_rcu(bond, slave, iter) {
3754                 if (bond_is_last_slave(bond, slave))
3755                         break;
3756                 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
3757                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3758
3759                         if (!skb2) {
3760                                 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
3761                                        bond_dev->name);
3762                                 continue;
3763                         }
3764                         /* bond_dev_queue_xmit always returns 0 */
3765                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3766                 }
3767         }
3768         if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
3769                 bond_dev_queue_xmit(bond, skb, slave->dev);
3770         else
3771                 kfree_skb(skb);
3772
3773         return NETDEV_TX_OK;
3774 }
3775
3776 /*------------------------- Device initialization ---------------------------*/
3777
3778 static void bond_set_xmit_hash_policy(struct bonding *bond)
3779 {
3780         switch (bond->params.xmit_policy) {
3781         case BOND_XMIT_POLICY_LAYER23:
3782                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
3783                 break;
3784         case BOND_XMIT_POLICY_LAYER34:
3785                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
3786                 break;
3787         case BOND_XMIT_POLICY_LAYER2:
3788         default:
3789                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
3790                 break;
3791         }
3792 }
3793
3794 /*
3795  * Lookup the slave that corresponds to a qid
3796  */
3797 static inline int bond_slave_override(struct bonding *bond,
3798                                       struct sk_buff *skb)
3799 {
3800         struct slave *slave = NULL;
3801         struct slave *check_slave;
3802         struct list_head *iter;
3803         int res = 1;
3804
3805         if (!skb->queue_mapping)
3806                 return 1;
3807
3808         /* Find out if any slaves have the same mapping as this skb. */
3809         bond_for_each_slave_rcu(bond, check_slave, iter) {
3810                 if (check_slave->queue_id == skb->queue_mapping) {
3811                         slave = check_slave;
3812                         break;
3813                 }
3814         }
3815
3816         /* If the slave isn't UP, use default transmit policy. */
3817         if (slave && slave->queue_id && IS_UP(slave->dev) &&
3818             (slave->link == BOND_LINK_UP)) {
3819                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3820         }
3821
3822         return res;
3823 }
3824
3825
3826 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
3827 {
3828         /*
3829          * This helper function exists to help dev_pick_tx get the correct
3830          * destination queue.  Using a helper function skips a call to
3831          * skb_tx_hash and will put the skbs in the queue we expect on their
3832          * way down to the bonding driver.
3833          */
3834         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3835
3836         /*
3837          * Save the original txq to restore before passing to the driver
3838          */
3839         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3840
3841         if (unlikely(txq >= dev->real_num_tx_queues)) {
3842                 do {
3843                         txq -= dev->real_num_tx_queues;
3844                 } while (txq >= dev->real_num_tx_queues);
3845         }
3846         return txq;
3847 }
3848
3849 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3850 {
3851         struct bonding *bond = netdev_priv(dev);
3852
3853         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
3854                 if (!bond_slave_override(bond, skb))
3855                         return NETDEV_TX_OK;
3856         }
3857
3858         switch (bond->params.mode) {
3859         case BOND_MODE_ROUNDROBIN:
3860                 return bond_xmit_roundrobin(skb, dev);
3861         case BOND_MODE_ACTIVEBACKUP:
3862                 return bond_xmit_activebackup(skb, dev);
3863         case BOND_MODE_XOR:
3864                 return bond_xmit_xor(skb, dev);
3865         case BOND_MODE_BROADCAST:
3866                 return bond_xmit_broadcast(skb, dev);
3867         case BOND_MODE_8023AD:
3868                 return bond_3ad_xmit_xor(skb, dev);
3869         case BOND_MODE_ALB:
3870         case BOND_MODE_TLB:
3871                 return bond_alb_xmit(skb, dev);
3872         default:
3873                 /* Should never happen, mode already checked */
3874                 pr_err("%s: Error: Unknown bonding mode %d\n",
3875                        dev->name, bond->params.mode);
3876                 WARN_ON_ONCE(1);
3877                 kfree_skb(skb);
3878                 return NETDEV_TX_OK;
3879         }
3880 }
3881
3882 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3883 {
3884         struct bonding *bond = netdev_priv(dev);
3885         netdev_tx_t ret = NETDEV_TX_OK;
3886
3887         /*
3888          * If we risk deadlock from transmitting this in the
3889          * netpoll path, tell netpoll to queue the frame for later tx
3890          */
3891         if (is_netpoll_tx_blocked(dev))
3892                 return NETDEV_TX_BUSY;
3893
3894         rcu_read_lock();
3895         if (!list_empty(&bond->slave_list))
3896                 ret = __bond_start_xmit(skb, dev);
3897         else
3898                 kfree_skb(skb);
3899         rcu_read_unlock();
3900
3901         return ret;
3902 }
3903
3904 /*
3905  * set bond mode specific net device operations
3906  */
3907 void bond_set_mode_ops(struct bonding *bond, int mode)
3908 {
3909         struct net_device *bond_dev = bond->dev;
3910
3911         switch (mode) {
3912         case BOND_MODE_ROUNDROBIN:
3913                 break;
3914         case BOND_MODE_ACTIVEBACKUP:
3915                 break;
3916         case BOND_MODE_XOR:
3917                 bond_set_xmit_hash_policy(bond);
3918                 break;
3919         case BOND_MODE_BROADCAST:
3920                 break;
3921         case BOND_MODE_8023AD:
3922                 bond_set_xmit_hash_policy(bond);
3923                 break;
3924         case BOND_MODE_ALB:
3925                 /* FALLTHRU */
3926         case BOND_MODE_TLB:
3927                 break;
3928         default:
3929                 /* Should never happen, mode already checked */
3930                 pr_err("%s: Error: Unknown bonding mode %d\n",
3931                        bond_dev->name, mode);
3932                 break;
3933         }
3934 }
3935
3936 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3937                                      struct ethtool_cmd *ecmd)
3938 {
3939         struct bonding *bond = netdev_priv(bond_dev);
3940         unsigned long speed = 0;
3941         struct list_head *iter;
3942         struct slave *slave;
3943
3944         ecmd->duplex = DUPLEX_UNKNOWN;
3945         ecmd->port = PORT_OTHER;
3946
3947         /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
3948          * do not need to check mode.  Though link speed might not represent
3949          * the true receive or transmit bandwidth (not all modes are symmetric)
3950          * this is an accurate maximum.
3951          */
3952         read_lock(&bond->lock);
3953         bond_for_each_slave(bond, slave, iter) {
3954                 if (SLAVE_IS_OK(slave)) {
3955                         if (slave->speed != SPEED_UNKNOWN)
3956                                 speed += slave->speed;
3957                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3958                             slave->duplex != DUPLEX_UNKNOWN)
3959                                 ecmd->duplex = slave->duplex;
3960                 }
3961         }
3962         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3963         read_unlock(&bond->lock);
3964
3965         return 0;
3966 }
3967
3968 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3969                                      struct ethtool_drvinfo *drvinfo)
3970 {
3971         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3972         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3973         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3974                  BOND_ABI_VERSION);
3975 }
3976
3977 static const struct ethtool_ops bond_ethtool_ops = {
3978         .get_drvinfo            = bond_ethtool_get_drvinfo,
3979         .get_settings           = bond_ethtool_get_settings,
3980         .get_link               = ethtool_op_get_link,
3981 };
3982
3983 static const struct net_device_ops bond_netdev_ops = {
3984         .ndo_init               = bond_init,
3985         .ndo_uninit             = bond_uninit,
3986         .ndo_open               = bond_open,
3987         .ndo_stop               = bond_close,
3988         .ndo_start_xmit         = bond_start_xmit,
3989         .ndo_select_queue       = bond_select_queue,
3990         .ndo_get_stats64        = bond_get_stats,
3991         .ndo_do_ioctl           = bond_do_ioctl,
3992         .ndo_change_rx_flags    = bond_change_rx_flags,
3993         .ndo_set_rx_mode        = bond_set_rx_mode,
3994         .ndo_change_mtu         = bond_change_mtu,
3995         .ndo_set_mac_address    = bond_set_mac_address,
3996         .ndo_neigh_setup        = bond_neigh_setup,
3997         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3998         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3999 #ifdef CONFIG_NET_POLL_CONTROLLER
4000         .ndo_netpoll_setup      = bond_netpoll_setup,
4001         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4002         .ndo_poll_controller    = bond_poll_controller,
4003 #endif
4004         .ndo_add_slave          = bond_enslave,
4005         .ndo_del_slave          = bond_release,
4006         .ndo_fix_features       = bond_fix_features,
4007 };
4008
4009 static const struct device_type bond_type = {
4010         .name = "bond",
4011 };
4012
4013 static void bond_destructor(struct net_device *bond_dev)
4014 {
4015         struct bonding *bond = netdev_priv(bond_dev);
4016         if (bond->wq)
4017                 destroy_workqueue(bond->wq);
4018         free_netdev(bond_dev);
4019 }
4020
4021 static void bond_setup(struct net_device *bond_dev)
4022 {
4023         struct bonding *bond = netdev_priv(bond_dev);
4024
4025         /* initialize rwlocks */
4026         rwlock_init(&bond->lock);
4027         rwlock_init(&bond->curr_slave_lock);
4028         INIT_LIST_HEAD(&bond->slave_list);
4029         bond->params = bonding_defaults;
4030
4031         /* Initialize pointers */
4032         bond->dev = bond_dev;
4033
4034         /* Initialize the device entry points */
4035         ether_setup(bond_dev);
4036         bond_dev->netdev_ops = &bond_netdev_ops;
4037         bond_dev->ethtool_ops = &bond_ethtool_ops;
4038         bond_set_mode_ops(bond, bond->params.mode);
4039
4040         bond_dev->destructor = bond_destructor;
4041
4042         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4043
4044         /* Initialize the device options */
4045         bond_dev->tx_queue_len = 0;
4046         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4047         bond_dev->priv_flags |= IFF_BONDING;
4048         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4049
4050         /* At first, we block adding VLANs. That's the only way to
4051          * prevent problems that occur when adding VLANs over an
4052          * empty bond. The block will be removed once non-challenged
4053          * slaves are enslaved.
4054          */
4055         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4056
4057         /* don't acquire bond device's netif_tx_lock when
4058          * transmitting */
4059         bond_dev->features |= NETIF_F_LLTX;
4060
4061         /* By default, we declare the bond to be fully
4062          * VLAN hardware accelerated capable. Special
4063          * care is taken in the various xmit functions
4064          * when there are slaves that are not hw accel
4065          * capable
4066          */
4067
4068         bond_dev->hw_features = BOND_VLAN_FEATURES |
4069                                 NETIF_F_HW_VLAN_CTAG_TX |
4070                                 NETIF_F_HW_VLAN_CTAG_RX |
4071                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4072
4073         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4074         bond_dev->features |= bond_dev->hw_features;
4075 }
4076
4077 /*
4078 * Destroy a bonding device.
4079 * Must be under rtnl_lock when this function is called.
4080 */
4081 static void bond_uninit(struct net_device *bond_dev)
4082 {
4083         struct bonding *bond = netdev_priv(bond_dev);
4084         struct list_head *iter;
4085         struct slave *slave;
4086
4087         bond_netpoll_cleanup(bond_dev);
4088
4089         /* Release the bonded slaves */
4090         bond_for_each_slave(bond, slave, iter)
4091                 __bond_release_one(bond_dev, slave->dev, true);
4092         pr_info("%s: released all slaves\n", bond_dev->name);
4093
4094         list_del(&bond->bond_list);
4095
4096         bond_debug_unregister(bond);
4097 }
4098
4099 /*------------------------- Module initialization ---------------------------*/
4100
4101 /*
4102  * Convert string input module parms.  Accept either the
4103  * number of the mode or its string name.  A bit complicated because
4104  * some mode names are substrings of other names, and calls from sysfs
4105  * may have whitespace in the name (trailing newlines, for example).
4106  */
4107 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4108 {
4109         int modeint = -1, i, rv;
4110         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4111
4112         for (p = (char *)buf; *p; p++)
4113                 if (!(isdigit(*p) || isspace(*p)))
4114                         break;
4115
4116         if (*p)
4117                 rv = sscanf(buf, "%20s", modestr);
4118         else
4119                 rv = sscanf(buf, "%d", &modeint);
4120
4121         if (!rv)
4122                 return -1;
4123
4124         for (i = 0; tbl[i].modename; i++) {
4125                 if (modeint == tbl[i].mode)
4126                         return tbl[i].mode;
4127                 if (strcmp(modestr, tbl[i].modename) == 0)
4128                         return tbl[i].mode;
4129         }
4130
4131         return -1;
4132 }
4133
4134 static int bond_check_params(struct bond_params *params)
4135 {
4136         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4137         int arp_all_targets_value;
4138
4139         /*
4140          * Convert string parameters.
4141          */
4142         if (mode) {
4143                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4144                 if (bond_mode == -1) {
4145                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4146                                mode == NULL ? "NULL" : mode);
4147                         return -EINVAL;
4148                 }
4149         }
4150
4151         if (xmit_hash_policy) {
4152                 if ((bond_mode != BOND_MODE_XOR) &&
4153                     (bond_mode != BOND_MODE_8023AD)) {
4154                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4155                                bond_mode_name(bond_mode));
4156                 } else {
4157                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4158                                                         xmit_hashtype_tbl);
4159                         if (xmit_hashtype == -1) {
4160                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4161                                        xmit_hash_policy == NULL ? "NULL" :
4162                                        xmit_hash_policy);
4163                                 return -EINVAL;
4164                         }
4165                 }
4166         }
4167
4168         if (lacp_rate) {
4169                 if (bond_mode != BOND_MODE_8023AD) {
4170                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4171                                 bond_mode_name(bond_mode));
4172                 } else {
4173                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4174                         if (lacp_fast == -1) {
4175                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4176                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4177                                 return -EINVAL;
4178                         }
4179                 }
4180         }
4181
4182         if (ad_select) {
4183                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4184                 if (params->ad_select == -1) {
4185                         pr_err("Error: Invalid ad_select \"%s\"\n",
4186                                ad_select == NULL ? "NULL" : ad_select);
4187                         return -EINVAL;
4188                 }
4189
4190                 if (bond_mode != BOND_MODE_8023AD) {
4191                         pr_warning("ad_select param only affects 802.3ad mode\n");
4192                 }
4193         } else {
4194                 params->ad_select = BOND_AD_STABLE;
4195         }
4196
4197         if (max_bonds < 0) {
4198                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4199                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4200                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4201         }
4202
4203         if (miimon < 0) {
4204                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4205                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4206                 miimon = BOND_LINK_MON_INTERV;
4207         }
4208
4209         if (updelay < 0) {
4210                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4211                            updelay, INT_MAX);
4212                 updelay = 0;
4213         }
4214
4215         if (downdelay < 0) {
4216                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4217                            downdelay, INT_MAX);
4218                 downdelay = 0;
4219         }
4220
4221         if ((use_carrier != 0) && (use_carrier != 1)) {
4222                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4223                            use_carrier);
4224                 use_carrier = 1;
4225         }
4226
4227         if (num_peer_notif < 0 || num_peer_notif > 255) {
4228                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4229                            num_peer_notif);
4230                 num_peer_notif = 1;
4231         }
4232
4233         /* reset values for 802.3ad */
4234         if (bond_mode == BOND_MODE_8023AD) {
4235                 if (!miimon) {
4236                         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");
4237                         pr_warning("Forcing miimon to 100msec\n");
4238                         miimon = 100;
4239                 }
4240         }
4241
4242         if (tx_queues < 1 || tx_queues > 255) {
4243                 pr_warning("Warning: tx_queues (%d) should be between "
4244                            "1 and 255, resetting to %d\n",
4245                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4246                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4247         }
4248
4249         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4250                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4251                            "not of valid value (0/1), so it was set to "
4252                            "0\n", all_slaves_active);
4253                 all_slaves_active = 0;
4254         }
4255
4256         if (resend_igmp < 0 || resend_igmp > 255) {
4257                 pr_warning("Warning: resend_igmp (%d) should be between "
4258                            "0 and 255, resetting to %d\n",
4259                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4260                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4261         }
4262
4263         /* reset values for TLB/ALB */
4264         if ((bond_mode == BOND_MODE_TLB) ||
4265             (bond_mode == BOND_MODE_ALB)) {
4266                 if (!miimon) {
4267                         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");
4268                         pr_warning("Forcing miimon to 100msec\n");
4269                         miimon = 100;
4270                 }
4271         }
4272
4273         if (bond_mode == BOND_MODE_ALB) {
4274                 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",
4275                           updelay);
4276         }
4277
4278         if (!miimon) {
4279                 if (updelay || downdelay) {
4280                         /* just warn the user the up/down delay will have
4281                          * no effect since miimon is zero...
4282                          */
4283                         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",
4284                                    updelay, downdelay);
4285                 }
4286         } else {
4287                 /* don't allow arp monitoring */
4288                 if (arp_interval) {
4289                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4290                                    miimon, arp_interval);
4291                         arp_interval = 0;
4292                 }
4293
4294                 if ((updelay % miimon) != 0) {
4295                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4296                                    updelay, miimon,
4297                                    (updelay / miimon) * miimon);
4298                 }
4299
4300                 updelay /= miimon;
4301
4302                 if ((downdelay % miimon) != 0) {
4303                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4304                                    downdelay, miimon,
4305                                    (downdelay / miimon) * miimon);
4306                 }
4307
4308                 downdelay /= miimon;
4309         }
4310
4311         if (arp_interval < 0) {
4312                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4313                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4314                 arp_interval = BOND_LINK_ARP_INTERV;
4315         }
4316
4317         for (arp_ip_count = 0, i = 0;
4318              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4319                 /* not complete check, but should be good enough to
4320                    catch mistakes */
4321                 __be32 ip = in_aton(arp_ip_target[i]);
4322                 if (!isdigit(arp_ip_target[i][0]) || ip == 0 ||
4323                     ip == htonl(INADDR_BROADCAST)) {
4324                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4325                                    arp_ip_target[i]);
4326                         arp_interval = 0;
4327                 } else {
4328                         if (bond_get_targets_ip(arp_target, ip) == -1)
4329                                 arp_target[arp_ip_count++] = ip;
4330                         else
4331                                 pr_warning("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4332                                            &ip);
4333                 }
4334         }
4335
4336         if (arp_interval && !arp_ip_count) {
4337                 /* don't allow arping if no arp_ip_target given... */
4338                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4339                            arp_interval);
4340                 arp_interval = 0;
4341         }
4342
4343         if (arp_validate) {
4344                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4345                         pr_err("arp_validate only supported in active-backup mode\n");
4346                         return -EINVAL;
4347                 }
4348                 if (!arp_interval) {
4349                         pr_err("arp_validate requires arp_interval\n");
4350                         return -EINVAL;
4351                 }
4352
4353                 arp_validate_value = bond_parse_parm(arp_validate,
4354                                                      arp_validate_tbl);
4355                 if (arp_validate_value == -1) {
4356                         pr_err("Error: invalid arp_validate \"%s\"\n",
4357                                arp_validate == NULL ? "NULL" : arp_validate);
4358                         return -EINVAL;
4359                 }
4360         } else
4361                 arp_validate_value = 0;
4362
4363         arp_all_targets_value = 0;
4364         if (arp_all_targets) {
4365                 arp_all_targets_value = bond_parse_parm(arp_all_targets,
4366                                                         arp_all_targets_tbl);
4367
4368                 if (arp_all_targets_value == -1) {
4369                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4370                                arp_all_targets);
4371                         arp_all_targets_value = 0;
4372                 }
4373         }
4374
4375         if (miimon) {
4376                 pr_info("MII link monitoring set to %d ms\n", miimon);
4377         } else if (arp_interval) {
4378                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4379                         arp_interval,
4380                         arp_validate_tbl[arp_validate_value].modename,
4381                         arp_ip_count);
4382
4383                 for (i = 0; i < arp_ip_count; i++)
4384                         pr_info(" %s", arp_ip_target[i]);
4385
4386                 pr_info("\n");
4387
4388         } else if (max_bonds) {
4389                 /* miimon and arp_interval not set, we need one so things
4390                  * work as expected, see bonding.txt for details
4391                  */
4392                 pr_debug("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");
4393         }
4394
4395         if (primary && !USES_PRIMARY(bond_mode)) {
4396                 /* currently, using a primary only makes sense
4397                  * in active backup, TLB or ALB modes
4398                  */
4399                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4400                            primary, bond_mode_name(bond_mode));
4401                 primary = NULL;
4402         }
4403
4404         if (primary && primary_reselect) {
4405                 primary_reselect_value = bond_parse_parm(primary_reselect,
4406                                                          pri_reselect_tbl);
4407                 if (primary_reselect_value == -1) {
4408                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4409                                primary_reselect ==
4410                                         NULL ? "NULL" : primary_reselect);
4411                         return -EINVAL;
4412                 }
4413         } else {
4414                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4415         }
4416
4417         if (fail_over_mac) {
4418                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4419                                                       fail_over_mac_tbl);
4420                 if (fail_over_mac_value == -1) {
4421                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4422                                arp_validate == NULL ? "NULL" : arp_validate);
4423                         return -EINVAL;
4424                 }
4425
4426                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4427                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4428         } else {
4429                 fail_over_mac_value = BOND_FOM_NONE;
4430         }
4431
4432         /* fill params struct with the proper values */
4433         params->mode = bond_mode;
4434         params->xmit_policy = xmit_hashtype;
4435         params->miimon = miimon;
4436         params->num_peer_notif = num_peer_notif;
4437         params->arp_interval = arp_interval;
4438         params->arp_validate = arp_validate_value;
4439         params->arp_all_targets = arp_all_targets_value;
4440         params->updelay = updelay;
4441         params->downdelay = downdelay;
4442         params->use_carrier = use_carrier;
4443         params->lacp_fast = lacp_fast;
4444         params->primary[0] = 0;
4445         params->primary_reselect = primary_reselect_value;
4446         params->fail_over_mac = fail_over_mac_value;
4447         params->tx_queues = tx_queues;
4448         params->all_slaves_active = all_slaves_active;
4449         params->resend_igmp = resend_igmp;
4450         params->min_links = min_links;
4451         params->lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4452
4453         if (primary) {
4454                 strncpy(params->primary, primary, IFNAMSIZ);
4455                 params->primary[IFNAMSIZ - 1] = 0;
4456         }
4457
4458         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4459
4460         return 0;
4461 }
4462
4463 static struct lock_class_key bonding_netdev_xmit_lock_key;
4464 static struct lock_class_key bonding_netdev_addr_lock_key;
4465 static struct lock_class_key bonding_tx_busylock_key;
4466
4467 static void bond_set_lockdep_class_one(struct net_device *dev,
4468                                        struct netdev_queue *txq,
4469                                        void *_unused)
4470 {
4471         lockdep_set_class(&txq->_xmit_lock,
4472                           &bonding_netdev_xmit_lock_key);
4473 }
4474
4475 static void bond_set_lockdep_class(struct net_device *dev)
4476 {
4477         lockdep_set_class(&dev->addr_list_lock,
4478                           &bonding_netdev_addr_lock_key);
4479         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4480         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4481 }
4482
4483 /*
4484  * Called from registration process
4485  */
4486 static int bond_init(struct net_device *bond_dev)
4487 {
4488         struct bonding *bond = netdev_priv(bond_dev);
4489         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4490         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4491
4492         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4493
4494         /*
4495          * Initialize locks that may be required during
4496          * en/deslave operations.  All of the bond_open work
4497          * (of which this is part) should really be moved to
4498          * a phase prior to dev_open
4499          */
4500         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4501         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4502
4503         bond->wq = create_singlethread_workqueue(bond_dev->name);
4504         if (!bond->wq)
4505                 return -ENOMEM;
4506
4507         bond_set_lockdep_class(bond_dev);
4508
4509         list_add_tail(&bond->bond_list, &bn->dev_list);
4510
4511         bond_prepare_sysfs_group(bond);
4512
4513         bond_debug_register(bond);
4514
4515         /* Ensure valid dev_addr */
4516         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4517             bond_dev->addr_assign_type == NET_ADDR_PERM)
4518                 eth_hw_addr_random(bond_dev);
4519
4520         return 0;
4521 }
4522
4523 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4524 {
4525         if (tb[IFLA_ADDRESS]) {
4526                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4527                         return -EINVAL;
4528                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4529                         return -EADDRNOTAVAIL;
4530         }
4531         return 0;
4532 }
4533
4534 static unsigned int bond_get_num_tx_queues(void)
4535 {
4536         return tx_queues;
4537 }
4538
4539 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4540         .kind                   = "bond",
4541         .priv_size              = sizeof(struct bonding),
4542         .setup                  = bond_setup,
4543         .validate               = bond_validate,
4544         .get_num_tx_queues      = bond_get_num_tx_queues,
4545         .get_num_rx_queues      = bond_get_num_tx_queues, /* Use the same number
4546                                                              as for TX queues */
4547 };
4548
4549 /* Create a new bond based on the specified name and bonding parameters.
4550  * If name is NULL, obtain a suitable "bond%d" name for us.
4551  * Caller must NOT hold rtnl_lock; we need to release it here before we
4552  * set up our sysfs entries.
4553  */
4554 int bond_create(struct net *net, const char *name)
4555 {
4556         struct net_device *bond_dev;
4557         int res;
4558
4559         rtnl_lock();
4560
4561         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4562                                    name ? name : "bond%d",
4563                                    bond_setup, tx_queues);
4564         if (!bond_dev) {
4565                 pr_err("%s: eek! can't alloc netdev!\n", name);
4566                 rtnl_unlock();
4567                 return -ENOMEM;
4568         }
4569
4570         dev_net_set(bond_dev, net);
4571         bond_dev->rtnl_link_ops = &bond_link_ops;
4572
4573         res = register_netdevice(bond_dev);
4574
4575         netif_carrier_off(bond_dev);
4576
4577         rtnl_unlock();
4578         if (res < 0)
4579                 bond_destructor(bond_dev);
4580         return res;
4581 }
4582
4583 static int __net_init bond_net_init(struct net *net)
4584 {
4585         struct bond_net *bn = net_generic(net, bond_net_id);
4586
4587         bn->net = net;
4588         INIT_LIST_HEAD(&bn->dev_list);
4589
4590         bond_create_proc_dir(bn);
4591         bond_create_sysfs(bn);
4592
4593         return 0;
4594 }
4595
4596 static void __net_exit bond_net_exit(struct net *net)
4597 {
4598         struct bond_net *bn = net_generic(net, bond_net_id);
4599         struct bonding *bond, *tmp_bond;
4600         LIST_HEAD(list);
4601
4602         bond_destroy_sysfs(bn);
4603         bond_destroy_proc_dir(bn);
4604
4605         /* Kill off any bonds created after unregistering bond rtnl ops */
4606         rtnl_lock();
4607         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4608                 unregister_netdevice_queue(bond->dev, &list);
4609         unregister_netdevice_many(&list);
4610         rtnl_unlock();
4611 }
4612
4613 static struct pernet_operations bond_net_ops = {
4614         .init = bond_net_init,
4615         .exit = bond_net_exit,
4616         .id   = &bond_net_id,
4617         .size = sizeof(struct bond_net),
4618 };
4619
4620 static int __init bonding_init(void)
4621 {
4622         int i;
4623         int res;
4624
4625         pr_info("%s", bond_version);
4626
4627         res = bond_check_params(&bonding_defaults);
4628         if (res)
4629                 goto out;
4630
4631         res = register_pernet_subsys(&bond_net_ops);
4632         if (res)
4633                 goto out;
4634
4635         res = rtnl_link_register(&bond_link_ops);
4636         if (res)
4637                 goto err_link;
4638
4639         bond_create_debugfs();
4640
4641         for (i = 0; i < max_bonds; i++) {
4642                 res = bond_create(&init_net, NULL);
4643                 if (res)
4644                         goto err;
4645         }
4646
4647         register_netdevice_notifier(&bond_netdev_notifier);
4648 out:
4649         return res;
4650 err:
4651         rtnl_link_unregister(&bond_link_ops);
4652 err_link:
4653         unregister_pernet_subsys(&bond_net_ops);
4654         goto out;
4655
4656 }
4657
4658 static void __exit bonding_exit(void)
4659 {
4660         unregister_netdevice_notifier(&bond_netdev_notifier);
4661
4662         bond_destroy_debugfs();
4663
4664         rtnl_link_unregister(&bond_link_ops);
4665         unregister_pernet_subsys(&bond_net_ops);
4666
4667 #ifdef CONFIG_NET_POLL_CONTROLLER
4668         /*
4669          * Make sure we don't have an imbalance on our netpoll blocking
4670          */
4671         WARN_ON(atomic_read(&netpoll_block_tx));
4672 #endif
4673 }
4674
4675 module_init(bonding_init);
4676 module_exit(bonding_exit);
4677 MODULE_LICENSE("GPL");
4678 MODULE_VERSION(DRV_VERSION);
4679 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4680 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4681 MODULE_ALIAS_RTNL_LINK("bond");